JP2022041338A - Chair provided with link mechanism - Google Patents

Abstract

To provide a chair provided with a link mechanism enabling a user to easily stand up/sit down and to reliably be seated at a correct seat position; and to prevent the user from being seated for many hours and eventually to help the user stay healthy.SOLUTION: A chair provided with a link mechanism can cause a seat plate to be fixed at an appropriate position between a position where a lateral view is a chevron-shaped at a prescribed angle and a position where it is planar and to be able to move on a bottom plate, places the link mechanism on a bottom plate, and places on the bottom plate a lifting type desk whose top plate height is variable by energizing the center of the seat plate so that it protrudes upward in the center line running horizontally along the direction orthogonal to a front direction of a user.SELECTED DRAWING: Figure 7

Description

The present invention relates to a chair provided with a link mechanism, and more particularly to a chair provided with a link mechanism in which the position and angle of the seat surface are variably adjusted and can be used in various postures.

In recent years, it has been proposed that sitting too much in a chair has an adverse effect on the body regardless of age, and it has been published in papers and the like. When sitting on a chair, the knees and hips are bent almost at right angles, so most of the weight can only be hung on the hips and spinal column. This is due to being maintained in a posture. On the other hand, various chairs used in homes, schools, offices, etc. are provided, for example, chairs equipped with functions such as height adjustment function (see Patent Document 1 and the like) and standing up. A chair equipped with a support function (see Patent Document 2 and the like) has also been proposed. For example, the chair disclosed in Patent Document 1 is provided with an operating mechanism such as a locking mechanism and a height adjusting mechanism of the back seat, and the standing / sitting support chair disclosed in Patent Document 2 allows the user to stand up. At that time, when the voice when standing up to the microphone is emitted, the voice data is analyzed and the rear part of the seat surface portion is raised by the electric actuator, and at the same time, the backrest portion is also raised upward.

Japanese Unexamined Patent Publication No. 2007-105293 Japanese Unexamined Patent Publication No. 2014-140435

However, the conventional chairs provided so far, including Patent Documents 1 and 2, can only sit by bending the knees and hips at a right angle and hanging most of the weight on the hips and spinal column. It was not possible to prevent the adverse effects on the body caused by sitting too much on the chair. Therefore, there is no choice but to change the "sitting style" that is the cause of the adverse effects on the body caused by sitting too much on the chair. Ideally, it is desirable to frequently stand up and sit down even during desk work to avoid lengthening the sitting posture. Further, since the conventional chair can be seated at an appropriate position in the front-rear direction of the seat plate, it is not always possible to sit in the correct seating position and in the correct sitting posture.

Therefore, the present invention has been made in view of such a problem, and is provided with a side view rhombus-shaped link mechanism, and the side view of the seat plate to be seated is mountain-shaped and the side view of the seat plate is flat. It is an object of the present invention to provide a chair equipped with a link mechanism that can be freely changed at an appropriate position between states and the link mechanism thereof.
Further, according to the present invention, the angle and height of the seat surface can be freely and instantly set. It is an object of the present invention to provide a chair equipped with a link mechanism that can be used in various postures such as sitting or leaning on a seat surface in a standing position, and the link mechanism thereof.
Another object of the present invention is to provide a chair provided with a link mechanism that enables the desk to be used in an optimum position according to the posture of the user.

The invention according to claim 1 in order to solve the above problems is a chair provided with a link mechanism for deforming the seat plate into a side view mountain shape and a flat plate shape, and the link mechanism is at the uppermost stage. An upper link portion provided with a first upper link member and a second upper link member is arranged, and the end sides of the first upper link member and the second upper link member adjacent to each other are directed upward by an urging member. By urging the upper link member so as to protrude, the side view of the upper link member becomes horizontal, and by applying a load against the urging force of the urging member, the side view of the link member becomes horizontal. A support member having a stretchable shaft is erected between the first link unit and the second link unit, and the shaft is provided with a first link unit and a second link unit that move up and down from the position. The tip of the first upper link member and the second upper link member are configured to guide the vertical movement of the adjacent end side of the first upper link member, and the first one in the first link unit and the second link unit, respectively. A first seat surface is arranged on the upper link member, a second seat surface is arranged on each of the second upper link members in the first link unit and the second link unit, and the link mechanism is on the bottom plate. It is characterized in that an elevating desk having a variable height of the top plate is arranged on the bottom plate.

The invention according to claim 2 for solving the above problems is a chair provided with a link mechanism for deforming the seat plate into a side view mountain shape and a flat plate shape, and the link mechanism has one end thereof. One end is rotatably connected to the first upper link shaft, the other end is rotatably connected to the first middle link shaft, and one end is rotatably connected to the second upper link shaft. At the same time, the other end is rotatably connected to the first middle link shaft with the upper link portion provided with the second upper link member rotatably connected to the second middle link shaft. , The other end is rotatably connected to the third central link shaft, and one end is rotatably connected to the second central link shaft, and the other end is the fourth central link shaft. The upper middle link portion provided with the second middle link member rotatably connected to the third middle link member, one end thereof is rotatably connected to the third middle link shaft, and the other end is the first lower link shaft. A third central link member rotatably connected to the fourth central link shaft, one end of which is rotatably connected to the fourth central link shaft, and the other end of which is rotatably connected to the second lower link shaft. (Iv) A lower middle link portion provided with a middle link member, one end thereof is rotatably connected to the first lower link shaft, and the other end is rotatably connected to the third lower link shaft. A first lower link member and a second lower link member having one end rotatably connected to the second lower link shaft and the other end rotatably connected to the fourth lower link shaft are provided. A first link unit and a second link unit configured with a lower link portion are provided, and the first link unit and the second link unit are the first and second upper link shafts and the first link unit. The first to fourth central link shafts and the first to fourth lower link shafts are arranged so as to face each other so as to be shared with each other, and between the third middle link shaft and the third lower link shaft or. An urging member for urging the first link unit and the second link unit upward is erected on any one or both of the fourth middle link shaft and the fourth lower link shaft, and the first one. A support member provided with a telescopic shaft is erected between the link unit and the second link unit, and the tip of the shaft is arranged so as to hold the first upper link shaft and the second upper link shaft. At the same time, the third lower link shaft and the fourth lower link shaft are configured to be movable up and down along the support member, and the link mechanism is arranged on the bottom plate, and the bottom plate is arranged. It is characterized by the fact that an elevating desk with a variable height of the top plate is arranged in the.

In order to solve the above problems, the invention according to claim 3 is the chair provided with the link mechanism according to claim 2, wherein the first central link member, the third central link member, and / or the second central portion are used. The link member and the fourth central link member are integrally formed.

In order to solve the above problems, the invention according to claim 4 is the chair provided with the link mechanism according to claim 2 or 3, wherein the first central link member, the third central link member, and / or the first central link member. (Ii) A substantially triangular reinforcing plate is arranged between the central link member and the fourth central link member.

The invention according to claim 5 for solving the above problems is a chair provided with the link mechanism according to any one of claims 2 to 4, wherein the first link unit and the second link unit are provided. A first seat surface is arranged on each of the first upper link members in the above, and a second seat surface is arranged on each of the second upper link members in the first link unit and the second link unit. The first seat surface and the second seat surface form a seat plate for the user to sit on, and the urging member urges the first link unit and the second link unit upward. The side view of the seat plate becomes horizontal by applying a load against the urging force of the urging member and the position where the center of the seat plate protrudes upward and the side view of the seat plate becomes a mountain shape. It is characterized by moving up and down between the position and the position.

In order to solve the above problems, the invention according to claim 6 is a chair provided with the link mechanism according to any one of claims 2 to 5, wherein the link mechanism includes the first link unit and the above. It is characterized in that a holding member for integrally holding the third central link shaft and the fourth central link shaft of the second link unit is provided.

In order to solve the above problems, the invention according to claim 7 further determines the shape and height of the seat plate in the chair provided with the link mechanism according to any one of claims 1 to 6. It is characterized by having a seat plate shape adjusting mechanism that is fixed in a state.

In order to solve the above problems, the invention according to claim 8 is a chair provided with the link mechanism according to any one of claims 1 to 7, wherein the elevating desk adjusts the posture of the top plate. It is characterized by further being provided with a posture adjusting mechanism for performing.

In order to solve the above problems, the invention according to claim 9 is a chair provided with the link mechanism according to any one of claims 1 to 8, wherein the elevating desk is connected to the link mechanism. It is characterized by further providing an interval adjusting mechanism for adjusting the interval.

In order to solve the above problems, the invention according to claim 10 is a chair provided with the link mechanism according to claim 9, wherein the interval adjusting mechanism is arranged so as to be horizontally movable back and forth from the front portion of the bottom plate. The arm is provided with a stopper and a stopper for positioning the arm at a predetermined position.

In order to solve the above problems, the invention according to claim 11 has a chair provided with the link mechanism according to any one of claims 1 to 10, wherein the bottom plate has a control means for controlling the movement. It is characterized in that a moving mechanism provided is provided.

According to the chair provided with the link mechanism according to the present invention, the side view of the seat plate to be seated can be freely changed at an appropriate position between the mountain-shaped state and the side view of the seat plate to be flat. Since it is possible to do this, the seating style can be changed as appropriate by changing the angle of the seating surface. In other words, it is a posture in which the knees and hips are bent almost at right angles, and by appropriately changing the shape of the seating plate from the normal sitting posture in which most of the weight is hung on the hips and spinal column, the posture of the middle hips. You can instantly change to use in various postures such as sitting on the seat, sitting leaning against the seat, or leaning against the seat while standing up, so sitting too much on the chair has an adverse effect on the body. That is, there is an effect that the load applied to the waist and the spinal column can be significantly reduced.

Further, according to the chair provided with the link mechanism according to the present invention, since the side view can be mountain-shaped, the width of the seat plate in the front-rear direction becomes compact, and the distance from the center of the seat plate to the user's foot. Can be shortened, and the bending angle of the upper body when sitting can be reduced accordingly. Therefore, when sitting in a normal posture, the user can change from a standing posture to a sitting posture by simply placing his / her buttocks lightly on the top of the center of the seat plate, which is the correct sitting position, without having to bend down greatly. You can make a smooth transition, and you don't have to put unnecessary force on your legs. In addition, by allowing the user to position the buttocks at the top of the seat plate at the start of sitting, the deforming seat plate supports the user's thighs in the process of shifting from the standing posture to the sitting posture. While gradually pushing the back side of the knee with the tip of the seat plate to promote the flexion of the knee, the user's posture is promoted to the optimum sitting posture, and there is no need to sit back after sitting.

Further, according to the chair provided with the link mechanism according to the present invention, when the user shifts from the sitting posture to the standing posture, the tip of the seat plate gradually retracts to the rear of the user, so that the user is seated. Even if the foot of the chair wraps around below the seat plate, the tip of the seat plate does not hit the back of the knee and interfere with the standing up. Therefore, the user can shift from the sitting posture to the standing posture by simply stretching his / her knees lightly without bending his / her upper body greatly, and does not need to put unnecessary force on his / her legs. In addition, since the tip of the seat plate does not hit the back of the knee while the user stands up, it is unlikely that the user will lose balance by pushing the chair behind the knee.

Further, according to the chair provided with the link mechanism according to the present invention, since the elevating desk having a variable top plate height is provided, the desk can be used in the optimum position according to the posture of the user. This makes it possible, and there is an effect that the user can freely perform desk work (reading, memos on notebooks, PC operation, etc.) in various postures. Moreover, there is an effect that the adverse effect on the body caused by sitting too much on the chair can be significantly reduced even while working using the desk. Such an elevating desk is particularly effective when the user frequently repeats standing and sitting by utilizing the link mechanism of the chair.

Further, according to the chair provided with the link mechanism according to the present invention, since the space adjusting mechanism for adjusting the distance between the elevating desk and the link mechanism is provided, the adjustment according to the body shape of the user can be performed. It has the effect of being possible.

Moreover, according to the chair provided with the link mechanism according to the present invention, since the elevating desk and the link mechanism are arranged on the bottom plate, the height of the top plate is adjusted when the user stands or sits down. At this time, since the user can put his / her feet on the bottom plate and put his / her weight on the bottom plate, there is an effect that the posture of the chair and the posture of the elevating desk can be prevented from becoming unstable.

Further, according to the chair provided with the link mechanism according to the present invention, since the chair provided with the moving mechanism provided with the fixing means, there is an effect that the chair can be easily moved and installed in a predetermined place.

FIG. 1 is a side view showing an embodiment of a chair provided with a link mechanism according to the present invention in a state where the seat plate has a mountain shape. FIG. 2 is a side view showing an embodiment of a chair provided with a link mechanism according to the present invention in a state where the seat plate is horizontal. FIG. 3 is a schematic plan view of the chair shown in FIGS. 1 and 2. FIG. 4 is a front view of an embodiment of the linkage mechanism. FIG. 5 is a perspective view showing the link mechanism and its surroundings. FIG. 6 is a partially enlarged view of FIG. 7 (A) to 7 (F) are explanatory views illustrating the movement of the seat plate. FIG. 8 is an explanatory diagram illustrating the seat plate shape adjusting mechanism. 9 (A) is a plan view illustrating the structure of the bottom plate and its surroundings, and FIG. 9 (B) is a cross-sectional view taken along line XX of FIG. 9 (A). 10A and 10B are explanatory views illustrating the movement of the stopper, FIG. 10A is an explanatory diagram of a state in which the pedal is not depressed, and FIG. 10B is an explanatory diagram of a state in which the pedal is depressed. FIG. 11 is an explanatory diagram showing a usage state of the chair.

Hereinafter, the chair and the link mechanism provided with the link mechanism according to the present invention will be described in detail with reference to the drawings of some preferable embodiments.

<Outline structure of chair>
FIG. 1 is a side view showing an embodiment of a chair provided with a link mechanism according to the present invention in a state where the seat plate is mountain-shaped, and FIG. 2 is a side view showing an embodiment of the chair according to the present invention in a state where the seat plate is horizontal. 3 is a schematic plan view of the chair shown in FIGS. 1 and 2, and FIG. 4 is a front view of the embodiment of the link mechanism.

As shown in FIGS. 1 to 4, in the chair 1 of the present embodiment, the seat plate 11 is roughly deformed between a side view mountain shape (state shown in FIG. 1) and a flat plate shape (state shown in FIG. 2). A metal (for example, stainless steel) link mechanism 12 is provided, and a backrest 20 is attached to the first upper link member 1U (details will be described later) of the link mechanism 12, and a second upper link member 2U (details will be described later). ) Is attached with a handle 40. Further, the support member 13 (details will be described later) of the link mechanism 12 is arranged on the bottom plate 70, and the elevating desk 100 having a variable height of the top plate 100TB is arranged on the bottom plate 20. As shown in FIG. 7, which will be described later, the shape of the seat plate 11 of the present embodiment can be freely changed. For example, the seat plate 11 has a pair of seat surfaces 11-1 and 11-2, respectively. It is composed of an integrally formed urethane mat with cushioning properties. Then, the seat plate 11 is configured by covering the entire urethane mat with a flexible vinyl chloride cover. The backrest 20 also functions as a mark to indicate to the user the direction in which the seat should be seated. The backrest 20 may have a gentle curve (R) in the left-right direction of the user.

<Outline configuration of link mechanism>
In the link mechanism 12 that deforms the seat plate 11 into a mountain shape and a flat plate shape (horizontal shape), an upper link portion UL having a first upper link member 1U and a second upper link member 2U is arranged on the uppermost stage, and the first Side view of the upper link member 1U, 2U by urging the end side of the upper link member 1U and the second upper link member 2U adjacent to each other so as to project upward by the urging members 50, 50. (See FIG. 1) and the position where the side view of the link members 1U and 2U becomes flat (horizontal) by applying a load against the urging force of the urging members 50 and 50 (see FIG. 1). A first link unit 12A and a second link unit 12B that move up and down with (see 2) are provided (see FIG. 4).

A support member 13 provided with a stretchable shaft 131 is erected between the first link unit 12A and the second link unit 12B, and the tip of the shaft 131 is the first upper link member 1U and the second upper link. It is configured to guide the vertical movement of the member 2U on the adjacent end side.

<Specific configuration of the link mechanism>
Further, the link mechanism 12 will be described in detail. As described above, the chair 1 of the present embodiment deforms the seat plate 11 between a position having a side view mountain shape (see FIG. 1) and a flat plate shape (horizontal shape) (see FIG. 2). The link mechanism 12 includes a first link unit 12A and a second link unit 12B having the same configuration as each other (see FIG. 5). Each of the first link unit 12A and the second link unit 12B includes an upper link portion UL, an upper middle link portion UML, a lower middle link portion LML, and a lower link portion LL.

The upper link portion UL has one end rotatably connected to the first upper link shaft 1u and the other end rotatably connected to the first middle link shaft 1m. The second upper link member 2U is rotatably connected to the second upper link shaft 2u and the other end is rotatably connected to the second middle link shaft 2m.

The upper middle link portion UML includes a first middle link member 1M having one end rotatably connected to the first middle link shaft 1 m and the other end rotatably connected to the third middle link shaft 3 m. A second central link member 2M having one end rotatably connected to the second central link shaft 2 m and the other end rotatably connected to the fourth central link shaft 4 m is provided.

The lower middle link portion LML has one end rotatably connected to the third middle link shaft 3 m and the other end rotatably connected to the first lower middle link shaft 1n. 3M and a fourth central link member 4M having one end rotatably connected to the fourth central link shaft 4m and the other end rotatably connected to the second lower link shaft 2n.

The lower link portion LL has a first lower link member 1L having one end rotatably connected to the first lower link shaft 1n and the other end rotatably connected to the third lower link shaft 3n. A second lower link member 2L is provided, one end of which is rotatably connected to the second lower link shaft 2n and the other end of which is rotatably connected to the fourth lower link shaft 4n.

<Relationship between the first and second link units>
The first link unit 12A and the second link unit 12B have a first upper link shaft 1u, a second upper link shaft 2u, a first middle link shaft 1m, a second middle link shaft 2m, a third middle link shaft 3m, and a first. The four central link shafts 4 m, the first lower link shaft 1n, the second lower link shaft 2n, the third lower link shaft 3n, and the fourth lower link shaft 4n are arranged so as to face each other so as to be shared with each other (4n). FIG. 4).

Further, either one or both (both in the figure) between the third central link shaft 3m and the third lower link shaft 3n or between the fourth middle link shaft 4m and the fourth lower link shaft 4n (both are shown). An urging member 50 for urging the one link unit 12A and the second link unit 12B so as to extend upward is erected. As the urging member, for example, a coil spring can be used, but other members such as an air cylinder and a hydraulic cylinder can also be appropriately used.

Further, a support member 13 provided with an expandable shaft 131 is erected between the first link unit 12A and the second link unit 12B, and the tips of the shaft 131 are the first upper link shaft 1u and the second upper link shaft. The third lower link shaft 3n and the fourth lower link shaft 4n are arranged so as to hold 2u, and are configured to be movable up and down along the support member 13. Further, the third central link shaft 3m and the fourth central link shaft 4m are held at predetermined positions of the support member 13, and the positions do not change when the first link unit 12A and the second link unit 12B expand and contract.

<Double type>
FIG. 5 is a perspective view showing the link mechanism and its surroundings.
As shown in FIG. 5, the chair 1 of the present embodiment is arranged so that two link mechanisms 12 and 12 are connected in parallel as a pair. By arranging the two link mechanisms 12, 12 in parallel as a pair in this way, the stability of the chair 1 can be improved. In order to absorb the impact when the shaft 131 expands and contracts, an urging member such as a coil spring may be arranged inside the support member 13 (reference numeral 51 in FIG. 4).

<Joint part of link member>
FIG. 6 is a partially enlarged view of FIG.
As shown in FIG. 6, in the link mechanism 12 used in the chair 1 of the present embodiment, the first central link member 1M, the third central link member 3M, the second central link member 2M, and the fourth central link member 4M are respectively. It is formed integrally. In this case, only one of them can be integrally formed. In the example shown in FIG. 6, the first central link member 1M and the third central link member 3M are integrally formed, and the second central link member 2M and the fourth central link member 4M are also integrally formed. As a result, the number of members and the number of movable parts (number of joints) can be reduced, so that the strength and durability of the chair 1 can be increased.

As shown in FIG. 6, in the link mechanism 12 used for the chair 1 of the present embodiment, between the first central link member 1M and the third central link member 3M, and between the second central link member 2M and the fourth. For example, a reinforcing plate (not shown) having a substantially triangular shape may be arranged between the central link member 4M and the central link member 4M. This reinforcing plate may be placed between only one of them.

<Composition of seat plate>
As shown in FIG. 5, in the chair 1 of the present embodiment, the first seat surface 11-1 is arranged on the first upper link member 1U of each of the first link unit 12A and the second link unit 12B, and the first seat surface 11-1 is arranged. A second seat surface 11-2 is arranged on each of the second upper link members 2U in the link unit 12A and the second link unit 12B, and the first seat surface 11-1 and the second seat surface 11-2 thereof are arranged. A seat plate 11 for the user to sit on is formed. In the present embodiment, the seat plate 11 is made of a cushioning urethane mat in which each of the pair of first seat surfaces 11-1 and the second seat surface 11-2 is integrally formed. It consists of covering the entire urethane mat with a flexible PVC cover.

7 (A) to 7 (F) are explanatory views illustrating the movement of the seat plate. The appearance of the chair 1 shown in FIG. 7 is a simplification of the appearance of the chair 1 of the present embodiment, and does not necessarily match the actual appearance.
As shown in FIG. 7A, when not in use, the first link unit 12A and the second link unit 12B constituting the pair of link mechanisms 12, 12 are respectively urged upward by the urging member 50. Therefore, the center of the seat plate 11 protrudes upward, and the side view of the seat plate 11 has a mountain shape. Then, by applying a downward load against the urging force of the urging member 50, the first link unit 12A and the second link unit 12B are lowered downward as shown in FIGS. 7A to 7F. However, it is continuously deformed to form a flat plate (horizontal). The first link unit 12A and the second link unit 12B project upward again by the urging member 50 except for the downward load on the seat plate 11 from the state where the seat plate 11 is flat (horizontal). It will be in the state of

<About holding member>
The pair of link mechanisms 12 and 12 are provided with a holding member P1 that integrally holds the third central link shaft 3 m and the fourth central link shaft 4 m of the first link unit 12A and the second link unit 12B, respectively. (See FIG. 6). Since the third central link shaft 3m and the fourth central link shaft 4m are held by the support member 13 and restrained from each other by the holding member P1, for example, rattling during deformation of the seat plate 11 is prevented and the movement is smooth. As a result, the stability of the chair 1 increases. Further, the members held by the holding member P1 can share a part of the mechanism (for example, the seat plate shape adjusting mechanism 60 below), which is efficient. The holding member P1 can also be composed of a member common to the beam member 63 (FIG. 4) erected between the pair of link mechanisms 12, 12.

<About the angle of the link member>
Further, as shown in FIG. 6, in the chair 1 of the present embodiment, the first central link member 1M and the third central link member 3M are integrally formed, and the second central link member 2M and the fourth central link member are integrally formed. 4M is integrally formed. The attachment angle θ1 of the first central link member 1M and the third central link member 3M (the same applies to the attachment angles of the second central link member 2M and the fourth central link member 4M) can be 90 °, respectively. It is preferable to set an angle smaller than 90 °, for example, 70 to 80 °. In this embodiment, θ1 is set to 75 °. When θ1 is set to an angle smaller than 90 °, the angle θ2 (FIG. 2) formed by the third central link member 3M and the first lower link member 1L is 180 ° when the seat plate 11 is in the horizontal state. Since it bends at a small angle (the same applies to the angle formed by the fourth central link member 4M and the second lower link member 2L), the seat plate 11 changes from a horizontal state (FIG. 7 (F)) to a non-horizontal state (FIG. 7 (E)). ), The movement of the link mechanism 12 becomes smooth (there is no rattling of the link mechanism 12).

<Seat plate shape adjustment mechanism>
As shown in FIG. 6, the chair 1 of the present embodiment includes a seat plate shape adjusting mechanism 60 that fixes the shape and height of the seat plate 11 in a predetermined state. The seat plate shape adjusting mechanism 60 of the present embodiment is, for example, as shown in FIGS. 4 and 8, under the beam member 62 erected between the first upper link shafts 1u of the pair of link mechanisms 12 and 12, respectively. Rotable around a shaft fixed to a beam member 63 erected between a plate-shaped brake plate 61 erected to the side and a third central link shaft 3 m of each of the pair of link mechanisms 12 and 12. The eccentric cam 60A, the lever 60B attached to the eccentric cam 60A, the fixing member 60C fixed to the beam member 63 so as to face the opposite side of the eccentric cam 60A with the brake plate 61 interposed therebetween, and the beam member 63. And a tension spring 60D that pulls the beam member 64 erected between the third lower link shafts 3n of the pair of link mechanisms 12 and 12 in a direction approaching each other. In FIG. 4, the lever 60B and the like are omitted. Further, the beam member 65 erected between the first central link shafts 1 m of the pair of link mechanisms 12 and 12 is provided with a predetermined opening for inserting the brake plate 16, and the brake plate 16 is provided with a predetermined opening. It has a function to guide the movement direction so that it does not deviate from the vertical direction. In this configuration, the eccentric cam 60A abuts at the contact portion T at a predetermined height position of the brake plate 61 depending on the position of the lever 60B to prevent the brake plate 61 from moving up and down, and is separated from the brake plate 61. The brake plate 61 rotates with and from a position that does not hinder the vertical movement of the brake plate 61. As a result, when the user grasps the lever 60B by hand and pushes it from the horizontal state on the left side of FIG. 8 to the inclined state on the right side of FIG. 8, the cam surface of the eccentric cam 60A and the fixing member 60C press the brake plate 61 from both sides. Hold it with a certain force and restrain it (clamp). As a result, the vertical movement of the brake plate 61 is restricted, so that the height position and shape of the seat plate 11 can be instantly fixed. When the user returns the lever 60B to the horizontal state (shown on the left side of FIG. 8) from that state, the cam surface of the eccentric cam 60A separates from the contact portion T, and the brake plate 61 has the eccentric cam 60A and the fixing member 60C. The brake plate 61 can be moved up and down, and the height position and shape of the seat plate 11 can be changed. Therefore, the user can change the height position and shape of the seat plate 11 and simply push the lever 60B downward from the horizontal state at a desired timing to change the height and shape of the seat plate 11 to a desired height. And can be instantly fixed to the shape.

In the above embodiment, two sets of the link mechanisms 12 are arranged in parallel, but the number of the link mechanisms 12 may be one set (single type). In this case, the entire chair 1 is supported by one support member 13. In the case of the single type chair 1, the number of parts can be reduced and the weight can be reduced.

<Height adjustment mechanism for elevating desk>
As shown in FIGS. 1 and 2, the chair 1 of the present embodiment includes an elevating desk 100, which has a top plate 100TB, a telescopic shaft 100S that supports the top plate 100TB, and a telescopic shaft 100S. It is provided with, for example, a screw-type height adjusting mechanism 100SA for adjusting the height of the top plate 100TB. FIG. 1 shows a state in which the top plate 100TB is set higher in accordance with the seat plate 11 having a side view mountain shape (a state in which the seat plate 11 is relatively high), and FIG. 2 shows a side view. It is shown that the top plate 100TB is also set lower in accordance with the flat plate-shaped seat plate 11 (a state in which the seat plate 11 is relatively low).

<Posture adjustment mechanism of top plate>
At the connecting portion between the top plate 100TB and the shaft 100S, a posture adjusting mechanism 100TBA for adjusting the posture of the top plate 100TB is provided, and the posture in the elevation angle direction of the top plate 100TB can be adjusted by this posture adjusting mechanism 100TBA. It has become. As the posture adjusting mechanism 100 TBA, for example, a screw type fixing structure as shown in the figure can be adopted, but the posture adjusting mechanism 100 TBA is not limited to this. Note that FIG. 1 shows a state in which the top plate 100TB is set to a posture facing the user side, and FIG. 2 shows a state in which the top plate 100TB is set to a posture facing directly upward. ..

<About the interval adjustment mechanism>
Further, as shown in FIGS. 1 and 2, the lower end side of the shaft 100S of the elevating desk 100 of the present embodiment is an interval for adjusting the distance between the pair of link mechanisms 12 and 12 described above and the elevating desk 100. It is connected to the adjusting mechanism 202, and the interval adjusting mechanism 202 is provided on the bottom plate 70.

As shown in FIG. 9, the interval adjusting mechanism 202 restrains the pair of left and right arms 202A and 202A arranged so as to be horizontally movable back and forth from the front end face side of the bottom plate 70 and the pair of left and right arms 202A and 202A. A beam member 202B, a guide portion 202G for limiting the moving direction of the pair of left and right arms 202A and 202A in the front-rear direction, and a stopper 203 for positioning one arm 202A at a predetermined position are provided. A plurality of stopper holes 202H, 202H, 202H, ... Are arranged in the arm 202A so as to be continuous along the moving direction (longitudinal direction).

<Stopper structure>
As shown in FIGS. 10A and 10B, the stopper 203 is rotated in a seesaw shape with the support column 203PP fixed to the bottom plate 70, the rotation shaft 203ST fixed to the support column 203PP, and the rotation shaft 203ST as fulcrums. A movable operation pedal 203P, a protrusion 203PT provided at the tip of the operation pedal 203P, a base end side of the operation pedal 203P (left side of the rotation shaft 203ST in FIGS. 10A and 10B), and a bottom plate 70. It is provided with a spring member 203SP interposed between the and. The outer diameter of the tip portion (projection portion 203PT) of the operation pedal 203P is set to be slightly smaller than the diameters of the stopper holes 202H, 202H, 202H, ... (See FIG. 9) formed in the arm 202A. ing. The operation pedal 203P is operated by the user stepping on it with his / her foot.

<Operation of stopper>
In the state where the user does not step on the operation pedal 203P with his / her own foot (FIG. 10 (A)), the base end side of the operation pedal 203P is pushed upward by the elastic force of the spring member 203SP, and the rotation is performed. The tip end side (projection portion 203PT) of the operation pedal 203P with the moving shaft 203ST as the center of rotation is in a state of being inserted into any of the stopper holes 202H. As a result, the protrusion 203PT is inserted into the stopper hole 202H, and the arms 202A and 202A are prevented from moving back and forth and are fixed to the bottom plate 70. Therefore, the protrusion 203PT is moved up and down from the link mechanism 12 (particularly the support member 13). The distance to the formula desk 100 is fixed (locked state).

On the other hand, in a state where the user depresses the operation pedal 203P with his / her own foot (FIG. 10B), the base end side of the operation pedal 203P is pushed down toward the bottom plate 70 side against the elastic force of the spring member 203SP. Therefore, the tip end side (protrusion portion 203PT) of the operation pedal 203P is pulled out apart from the stopper hole 202H, and the hooked state between the protrusion 203PT and the stopper hole 202H is released. As a result, the arms 202A and 202A can be moved in the front-rear direction, and the distance from the support member 13 of the link mechanism 12 to the elevating desk 100 can be appropriately changed (unlocked).

In this way, while the user is seated on the chair 1, the operation pedal 203P is stepped on with his / her foot to unlock the stopper 203, and the shaft 100S is gripped in the released state to hold the arms 202A and 202A of the elevating desk 100. By feeding back and forth from the bottom plate 70, it is possible to appropriately adjust the distance between the support member 13 of the link mechanism 12 and the elevating desk 100. Then, when the interval becomes an appropriate interval, the stopper 203 is locked by releasing the foot from the operation pedal 203P, and the interval from the support member 13 of the link mechanism 12 to the elevating desk 100 can be fixed. can.

<Movement mechanism>
Further, the chair 1 of the present embodiment is provided with a moving mechanism 204 for moving on the floor surface. The moving mechanism 204 includes moving rollers 204R, 204R, 204R, 204R, a brake handle 204H for controlling the rotation of at least one roller 204R, and the like. When the chair 1 is in the used state (the state in which the handle 204H in FIG. 2 is erected), the rotating surface of the roller 204 is held in a state of being separated (floating) from the floor surface, and 6 on the bottom surface of the bottom plate 70. The boss formed of the cushioning material provided at the location is in close contact with the floor surface (locked state). As a result, the movement of the chair 1 is reliably prevented and the chair 1 is stably arranged, and the boss having a cushioning property prevents the floor surface from being scratched. Then, when the user steps on the handle 204H with his / her foot to bring the handle 204H into a sideways state (state in FIG. 1), the rotating surface of the roller 204R comes into contact with the floor surface so as to be pressed against the floor surface, and the bottom plate 70 is pushed upward. The roller 204R becomes rotatable. As a result, the chair 1 can be moved and moved to a desired place (unlocked state). Then, when the user steps on the handle 204H again, the handle 204H is in the upright state again, and the roller 204R is in the locked state. The handle 204H is configured to repeat a locked state and an unlocked state each time it is stepped on by a lock mechanism that moves infinitely in an infinite loop using, for example, a heart cam.

<Operation of chair 1>
FIG. 11 is an explanatory diagram illustrating a usage state of the chair of the present embodiment.
In the chair 1 of the present embodiment, the seat plate 11 is urged along the direction (upper) Db orthogonal to the front direction Da of the user 2 when the user 2 is seated. This urging force acts so as to project the center line LC that crosses the center of the seat plate 11 in the left-right direction when viewed from the user 2 toward the upper Db. Moreover, the chair 1 of the present embodiment is an appropriate position between a position where the side view is mountain-shaped at a predetermined angle (FIG. 7 (A)) and a position where the side view is planar (FIG. 7 (F)). (For example, at any position of FIGS. 7 (A) to 7 (F)), the seat plate 11 can be easily fixed.

<Effect of this embodiment>
The chair 1 of the present embodiment has an appropriate position (for example,) between a position where the side view is mountain-shaped at a predetermined angle (FIG. 7 (A)) and a position where the side view is planar (FIG. 7 (F)). The seat plate 11 can be fixed at any of the positions of FIGS. 7 (A) to 7 (F)). Therefore, the user 2 of the chair 1 of the present embodiment can not only select either a completely standing posture (not shown) or a completely sitting posture (right side in FIG. 11 ), but also a standing posture and a sitting posture (not shown). It is also possible to freely select any posture in the middle (right side of FIG. 11 ). That is, from the normally seated state (right side in FIG. 11 ), the user 2 grasps the lever 60B by hand and pushes it from the horizontal state to the inclined state to instantly change the shape of the seat plate 11 appropriately. Can be done. Therefore, from the normal sitting posture in which the knees and hips are bent almost at right angles, you can instantly change to various postures such as sitting in a mid-waist posture, sitting leaning against the seat, or leaning against the seat while standing up. Can be changed to. Therefore, there is an effect that the adverse effect on the body due to sitting too much on the chair, that is, the load applied to the waist and the spinal column can be significantly reduced.

In recent years, as research results have been announced that the longer the sitting posture is, the more harmful it is to health, either maintain the standing posture without sitting, or maintain the posture as close as possible to the standing posture even if sitting. Is considered preferable. In this respect, the chair 1 of the present embodiment can fix the seat plate 11 at any position of FIGS. 7 (A) to 7 (F), so that the chair 1 can sit lightly in a posture close to an upright posture. It is possible to appropriately change the seating depth according to the degree of fatigue.

Specifically, at the start of desk work, the user 2 sets the angle of the top of the seat plate 11 to be steep (for example, FIG. 7A) and sits shallowly on the chair 1. After that, when the user 2 feels tired, the angle of the top of the seat plate 11 is set gently (for example, FIG. 7D) to increase the sitting depth. After that, if the fatigue is resolved, the angle of the top of the seat plate 11 may be switched to steep again (for example, FIG. 7A), and if the fatigue is not resolved, the angle of the top of the seat plate 11 may be further increased. It may be switched to gradual (for example, FIG. 7 (F)).

Further, when the user 2 is standing up, the side view of the seat plate 11 is mountain-shaped, and the width of the seat plate in the front-rear direction Da is narrow and compact, so that the seat plate 11 is from the center to the foot of the user 2. The distance L0 can be shortened, and the bending angle θ of the upper body when sitting can be reduced accordingly. Therefore, the user 2 can smoothly shift from the standing posture to the sitting posture by simply lightly placing his / her buttocks on the central top of the seat plate 11 which is the correct sitting position without bending the upper body greatly. There is no need to put unnecessary force on the legs and hips. Further, if the user 2 positions the buttocks on the top of the seat plate 11 at the start of sitting (left side in FIG. 11), the user 2 shifts from the standing posture to the sitting posture (right side in FIG. 11). Since the deforming seat plate supports the thighs of the user 2 and gradually pushes the back side of the knee with the tip of the seat plate to promote the flexion of the knee, the posture of the user 2 is promoted to the optimum sitting posture and the seat is seated. You don't have to sit back later.

Further, according to the chair 1 of the present embodiment, in the process of the user 2 shifting from the sitting posture (right side of FIG. 11) to the standing posture (left side of FIG. 11), the tip of the seat plate 11 gradually moves to the rear of the user 2. Therefore, even if the foot of the user 2 wraps around below the seat plate 11 at the time of sitting, the situation where the tip of the seat plate 11 hits the back of the knee and interferes with the standing up does not occur. Therefore, the user 2 can shift from the sitting posture (right side in FIG. 11) to the standing posture by simply stretching his / her knees lightly without bending his / her upper body greatly, and it is necessary to put unnecessary force on his / her legs. do not have. Further, since the tip of the seat plate 11 does not hit the back of the knee in the process of the user 2 standing up, it is considered unlikely that the user 2 loses his / her balance by pushing the chair behind the knee.

Therefore, according to the chair 1 of the present embodiment, the user 2 can easily stand up from the seated state (FIG. 11 side), so that it is possible to prevent the user 2 from being seated for a long time, and by extension, the seated state of the user 2 can be prevented from becoming long. There is an effect that the health of the user 2 can be maintained.

As a result of the above, the user 2 of the chair 1 of the present embodiment can acquire the habit of sitting as shallow as possible and changing the posture diligently (that is, the habit of "avoid sitting too much"). be. If you avoid sitting too much in this way, for example, moving around the room to get drinks will not be a hassle, and you can expect to improve your motivation to work, work efficiency, children's academic ability, etc. can. Furthermore, it may be possible to reduce the risk of illness caused by sitting too much and maintain good health.

<Effect of movement mechanism>
Further, according to the chair 1 provided with the link mechanism according to the present embodiment, the moving mechanism 204 for moving on the floor surface is provided, and the moving mechanism 204 controls the rotation of the roller 204R and the roller 204R. Since the handle 204H is provided as a control means for the chair 1, there is an effect that the chair 1 can be easily moved to a desired place and placed and fixed at that place.

<Effect of elevating desk>
Further, according to the chair 1 provided with the link mechanism according to the present embodiment, an elevating desk 100 having a variable height of the top plate 70 is arranged, and the desk 100 has a sitting posture that the user 2 can take. Since the height can be set to be suitable for various postures such as the standing posture or the mid-waist posture between them, and the angle of the top plate can be adjusted, the user 2 can freely work on the table in various postures. It has the effect of being able to perform (reading, memos to notes, PC operation, etc.). Further, since the space adjusting mechanism 202 for adjusting the space between the elevating desk 100TB and the link mechanism 12 is further provided, there is an effect that the space can be adjusted according to the body shape of the user.

Moreover, according to the chair 1 of the present embodiment, since the elevating desk 100 and the link mechanisms 12 and 12 are arranged on the bottom plate 70, the height of the top plate 100TB when the user 2 stands up or sits down. Since the user 2 can put his / her feet on the bottom plate 70 and put at least a part of his / her weight on the bottom plate 70, the posture of the chair 1 and the posture of the elevating desk 100 become unstable. It has the effect of preventing it from becoming.

Further, according to the chair 1 of the present embodiment, since the elevating desk 100 and the link mechanism 100 are arranged on the common bottom plate 70, the weight of the chair 1 is adjusted when adjusting the height of the top plate 100TB. Therefore, the posture of the elevating desk 100 can be stabilized, and when the shape of the seat plate 11 is deformed, the posture of the link mechanisms 12 and 12 can be stabilized by the weight of the elevating desk 100.

11 Seat plate 12A 1st link unit 12B 2nd link unit 12 Link mechanism 131 Shaft 13 Support member 1L 1st lower link member 1M 1st central link member 1U 1st upper link member 1n 1st lower link shaft 1m 1st Central link shaft 1u 1st upper link shaft 2L 2nd lower link member 2M 2nd middle link member 2U 2nd upper link member 2n 2nd lower link shaft 2m 2nd middle link shaft 2u 2nd upper link shaft 3M 3rd middle link Member 3n Third lower link shaft 3m Third middle link shaft 20 Backrest 40 Handle 4M Fourth middle link member 4n Fourth lower link shaft 4m Fourth middle link shaft 50 Bias member 60 Seat plate shape adjustment mechanism 60A Eccentric cam 60B Lever 60C Fixing member 61 Brake plate 62 Beam member 63 Beam member 64 Beam member 70 Bottom plate 202G Guide groove 100 Lifting desk 100TB Top plate 100S Shaft 100SA Height adjustment mechanism 100TBA Attitude adjustment mechanism 202 Interval adjustment mechanism 202A Arm 202B Needle member 202G Guide 202H Stopper hole 203 Stopper 203PP Prop 203ST Rotating shaft 203P Operation pedal 203PT Protrusion part 203SP Spring member 204 Movement mechanism 204H Brake handle 204R Roller LC Center line LL Lower link part LML Lower middle link part P Reinforcing plate P1 Reinforcing member T Contact UL Upper Link UML Upper Middle Link

Claims (11)

It is a chair equipped with a link mechanism for transforming the seat plate into a side view mountain shape and a flat plate shape.
The link mechanism is
An upper link part provided with a first upper link member and a second upper link member is arranged on the uppermost stage.
By urging the end side of the first upper link member and the second upper link member adjacent to each other so as to project upward by the urging member, the side view of the upper link member becomes a mountain shape. A first link unit and a second link unit that move up and down between the position where the link member is formed and the position where the side view of the link member becomes horizontal by applying a load against the urging force of the urging member.
A support member having a stretchable shaft is erected between the first link unit and the second link unit, and the tip of the shaft is adjacent to the first upper link member and the second upper link member. It is configured to guide the vertical movement on the end side,
A first bearing surface is arranged on each of the first upper link members in the first link unit and the second link unit, and the second upper link member in each of the first link unit and the second link unit. The second seat is placed in
The link mechanism is arranged on the bottom plate and
A chair equipped with a link mechanism, characterized in that an elevating desk having a variable height of the top plate is arranged on the bottom plate. It is a chair equipped with a link mechanism for transforming the seat plate into a side view mountain shape and a flat plate shape.
In the link mechanism, one end is rotatably connected to the first upper link shaft, the other end is rotatably connected to the first middle link shaft, and one end is the second upper part. An upper link portion provided with a second upper link member rotatably connected to the link shaft and rotatably connected to the second middle link shaft at the other end.
One end is rotatably connected to the first central link shaft, the other end is rotatably connected to the third central link shaft, and one end is rotatably connected to the second central link shaft. An upper middle link portion provided with a second middle link member rotatably connected and rotatably connected to the fourth middle link shaft at the other end.
One end is rotatably connected to the third middle link shaft, the other end is rotatably connected to the first lower link shaft, and one end is the fourth middle link. A lower middle link portion provided with a fourth middle link member rotatably connected to the shaft and rotatably connected to the second lower link shaft at the other end.
One end is rotatably connected to the first lower link shaft, the other end is rotatably connected to the third lower link shaft, and one end is the second lower part. A lower link portion provided with a second lower link member rotatably connected to the link shaft and rotatably connected to the fourth lower link shaft at the other end.
Equipped with a first link unit and a second link unit configured with
In the first link unit and the second link unit, the first and second upper link shafts, the first to fourth middle link shafts, and the first to fourth lower link shafts are shared with each other. Arranged so as to face each other,
The first link unit and the second link are located between the third central link axis and the third lower link axis, or between the fourth central link axis and the fourth lower link axis, or both. An urging member that urges the unit upward is erected,
A support member provided with a stretchable shaft is erected between the first link unit and the second link unit, and the tip of the shaft holds the first upper link shaft and the second upper link shaft. The third lower link shaft and the fourth lower link shaft are configured to be movable up and down along the support member.
The link mechanism is arranged on the bottom plate and
A chair equipped with a link mechanism, characterized in that an elevating desk with a variable height of the top plate is arranged on the bottom plate. In the chair provided with the link mechanism according to claim 2.
A chair provided with a link mechanism, wherein the first central link member, the third central link member, and / or the second central link member and the fourth central link member are integrally formed. In the chair provided with the link mechanism according to claim 2 or 3.
A link characterized in that a substantially triangular reinforcing plate is arranged between the first central link member and the third central link member and / or between the second central link member and the fourth central link member. A chair with a mechanism. A chair provided with the link mechanism according to any one of claims 2 to 4.
A first seating surface is arranged on each of the first upper link members in the first link unit and the second link unit, and the second upper link member in each of the first link unit and the second link unit. A second seat surface is arranged in the seat, a seat plate for a user to sit on is formed by the first seat surface and the second seat surface, and the first link unit and the second link unit are formed by the urging member. Is urged upward so that the center of the seat plate protrudes upward and the side view of the seat plate becomes a mountain shape, and a load is applied against the urging force of the urging member. A chair provided with a link mechanism, which is characterized by moving up and down from a position where the side view of the seat plate becomes horizontal. In the chair provided with the link mechanism according to any one of claims 2 to 5.
The link mechanism is provided with a holding member for integrally holding the first link unit and the third central link shaft of the second link unit and the fourth central link shaft.
A chair with a link mechanism that features that. In the chair provided with the link mechanism according to any one of claims 1 to 6.
Further, a chair provided with a link mechanism, which comprises a seat plate shape adjusting mechanism for fixing the shape and height of the seat plate in a predetermined state. In the chair provided with the link mechanism according to any one of claims 1 to 7.
The elevating desk is a chair provided with a link mechanism, further comprising a posture adjusting mechanism for adjusting the posture of the top plate. In the chair provided with the link mechanism according to any one of claims 1 to 8.
The elevating desk is a chair provided with a link mechanism, further comprising a distance adjusting mechanism for adjusting the distance between the elevating desk and the link mechanism. In the chair provided with the link mechanism according to claim 9.
The interval adjustment mechanism is
An arm arranged so as to be horizontally movable back and forth from the front part of the bottom plate,
A stopper for positioning the arm in a predetermined position,
A chair with a link mechanism characterized by being equipped with. In the chair provided with the link mechanism according to any one of claims 1 to 10.
A chair provided with a link mechanism, characterized in that the bottom plate is provided with a movement mechanism provided with a control means for controlling the movement.

Images