JP2015123269A - Chair that facilitates sitting-down and standing-up - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair that, after a user sitting thereon takes an ordinary seated posture, enables the user to turn slightly upward, for example, like a movie-watching posture in a movie theater and that also facilitates sitting-down and standing-up.SOLUTION: The chair includes: a seating part on which a user sits down; legs 3 connected to a lower part of the seating part; and a pedestal part which is connected to the lower end of the legs 3 and which has a grounding face 2a extending in the front and rear direction with a fixed length. The chair is characterized in that the seating face 1a of the seating part is equipped with a tilting fulcrum K which tilts to the rear relative to the floor face F, near the intermediate point between the seating face 1a and the rear end part of the pedestal part, that is, between the grounding face 2a of the pedestal part and the floor face F.

Description

  The present invention relates to a chair, and more particularly to a chair that is easy to sit up and stand up, such as a seat in a movie theater, which is suitable for an application that requires the user's eyes to face upward.

  As is well known, a rocking chair, which is another name for an easy chair, is provided with a pair of sledge-shaped pedestals that are curved in a convex shape in the floor direction at the lower end of the leg of the chair, When sitting on the seating surface of the rocking chair, the seating surface swings in the shape of a cradle in the front-rear direction corresponding to the position of the center of gravity where the user is sitting.

  The history of such a rocking chair is quite old, and it has been used in the West for centuries, and there are many types of rocking chairs.

  For example, the conventional rocking chair 50 shown in FIG. 13 is formed by connecting five straight portions 52a to 52e with a ground contact surface of a pedestal 51 that has been curved in the past.

  As described above, the ground contact surface of the pedestal 51 of the rocking chair 50, which has conventionally been a smooth curve, is constituted by the plurality of linear portions 52a to 52e. (Not shown) sits on the seat 53, and even if it moves slightly on the seat 53, the center of gravity of the user's body moves. As a result, the pedestal 51 tilts sensitively. Because it was.

  Therefore, although not shown in the figure, the configuration of the five straight portions 52a to 52e of the pedestal is stopped, and only the front portion where the user's foot is located is out of the two surfaces, that is, the grounding surface of the pedestal. There are rocking chairs described in, for example, Patent Document 1 and Patent Document 2, which are inclined in a direction away from the floor surface F.

  Although the illustration of the characteristics of this rocking chair is omitted, when the user stands up from the seating surface as a result of inclining only the front part where the user's feet are located in the direction away from the floor surface, the grounding surface of the pedestal is inclined. Since the rocking chair can tilt in the forward direction of the user, the user can easily stand up from the rocking chair when the user is an elderly person, a sick person, or a child.

  However, both of the rocking chairs described in Patent Document 1 and Patent Document 2 have a common point that the rear portion of the pedestal is formed in parallel with the seating surface and the grounding surface of the pedestal is located in front. .

  Therefore, when it is necessary to take a slightly upward posture (in the present invention, abbreviated as “backward tilting posture” hereinafter) while watching a movie, for example, as a seat in a movie theater, the upward posture cannot be taken and the rocking is performed. Since the seating surface of the chair is parallel to the floor surface, there is a problem of fatigue when sitting for a long time.

  Also, when a user tries to stand up from a rocking chair whose sitting posture is a backward tilting posture, there is no problem for a healthy person, but it is difficult for an elderly person or a sick person who has weak legs and the like to stand up.

  Furthermore, as shown in the figures of each patent document, the tip of the pedestal moves up and down near the user's foot, so that the user's foot is sandwiched between the tip of the pedestal and the floor surface, resulting in injury. There is a problem that it is easy to do.

JP 2013-158502 A (Claim 1, FIG. 1, FIG. 4) Japanese Patent Laying-Open No. 2003-381 (Claims 1, 3 and 8)

  Therefore, the present invention has been made to solve the above-mentioned problems, and after the user sitting on the rocking chair takes a normal sitting posture, for example, the movie watching posture in a movie theater is slightly adjusted upward. It is an object of the present invention to provide a chair (hereinafter simply referred to as “chair”) that can take a sitting posture and is easy to sit and stand up.

In order to solve the above problems, a chair according to the present invention is connected to a seating portion on which a user sits, a leg portion connected to the lower side of the seating portion, and a lower end of the leg portion, and a ground contact surface in the front-rear direction. In a chair with a pedestal that extends a certain length,
Near the midpoint between the front end and the rear end of the pedestal, and between the grounding surface of the pedestal and the floor, the seating surface of the seat is rearward with respect to the floor A tilting fulcrum that tilts is provided (hereinafter, this invention is referred to as “first invention”).

  Here, with respect to the front and rear and the vertical direction of each member of the chair of the present invention, the front and rear direction is referred to as the “front and rear direction” of each member of the chair according to the present invention as viewed from the posture in which the user is seated on the pedestal. When viewed from the seating posture of the user, the vertical direction is referred to as the “vertical direction” of each member of the chair according to the present invention, and the same applies to the “width direction”.

  Further, “near the middle point between the front end portion and the rear end portion of the pedestal portion” means the position in the front-rear direction of the “tilting fulcrum” located between the grounding surface and the floor surface of the pedestal portion. However, specifically, the length from the rear end portion of the pedestal portion to the tilting fulcrum is in the range of 40 to 50% with respect to the total length of the pedestal portion. If the position of the “tilting fulcrum” is 40% or more from the rear end, the stability of the chair when tilting backwards will be high, and the user will continue to have his / her eyes slightly upward without anxiety. You can sit in this state. On the other hand, when the position of the “tilting fulcrum” is 50% or less from the rear end, it is a normal seating state, and the user can maintain this state for a long time.

  The “tilting fulcrum” is basically a fulcrum for the seating surface, which is one of its constituent members, to tilt backward with respect to the floor surface when the entire chair according to the present invention tilts backward. The installation position is roughly divided into a case where it is provided on the pedestal side and a case where it is provided on the floor surface side.

  In the first invention, the tilting fulcrum is a lower surface of the pedestal portion, and is a protruding portion that protrudes in the floor surface direction from a line connecting the front end portion and the rear end portion, and the seating portion is the leg portion. The seating surface of the seating portion may be rotated with respect to the floor surface by inserting a rotary bearing between the seating portion and the seating portion (hereinafter, this invention is referred to as “second invention”). .).

  The rotary bearing is satisfactory if it is a thrust bear rig, but may be a disc-shaped slide bearing or an oil-impregnated bearing.

  In the chair of the first invention or the second invention, the safety of preventing the user's foot from being caught between the floor surface and the front end portion of the seating portion by surrounding the front end portion of the seating portion. A cover may be provided (hereinafter, this invention is referred to as “third invention”).

  Various types of safety covers are included, such as those that surround a gap formed between the floor and the front end of the seating part, and those that physically move the user's foot away from the gap. .

  In the chair according to any one of the first to fourth inventions, the lowering portion of the seating portion is formed in a “<” shape protruding in the floor surface direction, whereby the tilting operation of the seating portion is performed. In addition to the backward tilting posture, an operation composed of two postures including a forward tilting posture may be possible (hereinafter, the present invention will be referred to as a “fourth invention”).

  According to the chair of the first invention, the tilting fulcrum tilting backward with respect to the floor surface of the seating portion is provided between the grounding surface of the pedestal portion and the floor surface. When it is necessary to turn his eyes upward, the user can easily change his posture by moving his weight backward. If the user can take such a back-tilt posture, it will be very easy and comfortable even when sitting in a chair for a long time.

  According to the chair of the second invention, in addition to the effects of the first invention, the seating portion of the chair of the present invention can be tilted backward when standing up from the chair because the seating surface can rotate with respect to the floor surface. The seating surface is immediately tilted forward by reversing the chair in the posture. Therefore, for example, when the user is a disabled person or an elderly person, the user can easily stand up from the seating surface of the chair.

  On the other hand, when sitting on a chair, after sitting on a chair in which the seating surface immediately after rising from the seating surface is in a forward tilted posture, the chair is inverted while the user is seated. It is possible to take a backward tilting posture immediately.

  Therefore, the chair of the present invention can easily provide a chair that is easy to sit and stand up.

  According to the chair of the third invention, in addition to the effects of the first invention and the second invention, the safety cover for preventing the user's foot from being caught between the floor surface and the front end portion of the seating portion is provided. The user will not be injured by his / her feet when the chair is tilted.

  According to the chair of the fourth invention, in addition to the effects of the first to third inventions, the lower part of the seating portion is formed in a “<” shape protruding in the floor surface direction. In addition to being able to be in a posture, it is possible to have a two-position posture in which a forward leaning posture is also added. Therefore, the chair of the present invention can easily stand up from the chair without rotating the seating surface, and a chair that is easy to sit and stand up can be easily obtained.

FIG. 1 is a side view of a chair according to the first embodiment of the present invention. 2 is a side view showing how to use the chair of FIG. 1, in which FIG. 2 (a) is a side view during normal use, FIG. 2 (b) is a side view when the chair is tilted backward, FIG. (C) is a side view in which the seating part is rotated 180 ° and half from the state shown in FIG. 2 (b), and FIG. 2 (d) shows a state where the user stands up from the chair shown in FIG. 2 (c). It is a side view. FIG. 3 is an embodiment of another chair of the present invention, in which FIG. 3 (a) is a side view showing a part of the pedestal, and FIG. 3 (b) is FIG. 3 (a). It is a side view of the pedestal part of a different type. FIG. 4 is also an embodiment of another chair of the present invention, in which FIG. 4 (a) is a side view of the pedestal portion, and FIG. 4 (b) is a circle region of the pedestal portion of FIG. 4 (a). It is an enlarged side view. FIG. 5 is a side view of a chair according to the second embodiment of the present invention. 6 (a) is a perspective view of a safety cover used in the pedestal portion of the chair of FIG. 5, and FIG. 6 (b) is a perspective view of a safety cover of a type different from the type of FIG. 6 (a). . 7A and 7B are three views of the safety cover of FIG. 6A, in which FIG. 7A is a plan view, FIG. 7B is a front view, and FIG. 7C is a left side view. 8A and 8B are three views of the safety cover of FIG. 6B, in which FIG. 8A is a plan view, FIG. 8B is a front view, and FIG. 8C is a left side view. FIG. 9 is a view of a pipe chair type chair according to the third embodiment of the present invention, in which FIG. 9 (a) is an overall perspective view, and FIG. 9 (b) is a view of the chair of FIG. 9 (a). It is a partial side view which shows a use condition. FIG. 10 shows another embodiment of the connecting portion in FIG. 9 (a), in which FIG. 9 (a) is a partial side view, and FIG. 9 (b) is a fulcrum portion A-- in FIG. 9 (a). It is a transverse cross section in the A line position. FIG. 11 is a side view of a pipe chair type chair that can be folded according to the fourth embodiment of the present invention. 12 is a side view of the chair of FIG. 11 in a folded state. FIG. 13 is a perspective view of a conventional rocking chair.

DESCRIPTION OF SYMBOLS 1 Seating part 2 Base part 3 Leg part 4 Seating rotation part 5 Armrest part and backrest part 10A Chair (this invention)
10B Chair (present invention)
10C pipe chair (present invention)
10D pipe chair (present invention)
11 Safety cover 12 Safety stand 50 Rocking chair (prior art)
F Floor G User's body center of gravity K Tilt fulcrum P User

  Hereinafter, various embodiments of a chair according to the present invention will be described with reference to the drawings.

Embodiment 1

  FIG. 1 is a side view of a chair 10A according to the first embodiment of the present invention, which is of a type in which a seating portion 1 rotates.

  In the present invention, when viewed from the posture in which the user P (FIG. 2) is seated on the pedestal 2, the front-rear direction is referred to as the “front-rear direction” (the left-right direction in FIG. 1) of the chair 10A of the present invention. The width direction is referred to as the “width direction” (the direction perpendicular to the paper surface in FIG. 1) in the chair 10A of the present invention, and the vertical direction is the “vertical direction” (the vertical direction of the paper surface in FIG. 1) of the chair 10A of the present invention. The same applies to the chairs of the other embodiments.

  As shown in the figure, the chair 10A of the present embodiment is composed of a seating portion 1, a pedestal portion 2, a leg portion 3, a seating rotation portion 4, and an armrest and backrest portion 5.

  The pedestal portion 2 is a so-called base of the chair 10A, and has a rod shape extending in the front-rear direction. Although not shown in the figure, a pair of “sledge” -like objects are arranged in parallel in the width direction at predetermined intervals. However, the ground contact surface 2 a of the pedestal portion 2 exists at the front portion of the pedestal portion 2, and is formed with a ground contact length L 1 parallel to the seating surface 1 a of the seat portion 1. The rear portion of the pedestal portion 2 is not grounded to the floor surface F, and the length L2 portion is cut out by a height J to form a cutout surface 2b.

  The leg portion 3 is fixed on the pedestal portion 2 and has four legs in this embodiment, but the number of legs is not particularly limited. Further, the shape of the leg portion 3 is not a rod shape as shown in the figure, and may be a pipe shape or a plate shape as a matter of course. A base plate 3a is fixed to the upper end of the four legs.

  The seating rotating part 4 is interposed between the leg part 3 and the seating part 1, and rotates the seating part 1 with respect to the leg part 3. For example, a thrust bearing, a sliding bearing, etc. (not shown) are provided in this part. Built in.

  The seating portion 1 is a plate-like shape on which the user puts the buttock. In the present embodiment, the seating surface 1a is a quadrangular shape in plan view, but of course it may be of any shape.

  A pair of armrests 5a are also fixed to both ends in the width direction of the seating portion 1, and the backrest portion 5b is slightly inclined with respect to the seating surface 1a, and the upper end portion thereof is curved in plan view. The backrest portion 5c is fixed.

  Next, with reference to FIG. 2, the usage method of the chair 10A of embodiment of FIG. 1 is demonstrated.

  First, FIG. 2A is a side view showing a state where the user P is seated on the seating portion 1 of the chair 10A of FIG. 1, and the grounding surface 2a of the pedestal portion 2 and the seating portion 1 are parallel to each other. Further, since the center of gravity G of the user P is on the front side of the tilting fulcrum K of the pedestal portion 2, the posture of the chair 10A is stabilized at this position. Accordingly, the viewpoint S of the user P is substantially parallel to the floor surface F, and the user P normally uses the chair 10A in this sitting posture.

  However, it is very difficult for a healthy person to keep the same posture for a long time, especially for a disabled person or an elderly person with weak legs. Therefore, as shown in FIG. 2B, the user P can bring his / her back to the backrest 5b. Then, the chair 10 </ b> A is integrated with the user P by the movement of the center of gravity G of the body of the user P, and the chair 10 </ b> A tilts backward with the tilting fulcrum K of the pedestal part 2 as a fulcrum. The angle α is tilted backward. In this case, since the center of gravity G of the user P moves to the rear side from the tilting fulcrum K of the pedestal 2, the chair 10A is stabilized at this position. In this case, as shown in the figure, the viewpoint of the user P is upward at the same angle α (in other words, the line of sight) as the tilt angle α of the chair 10A, so that it is used when watching a movie in a movie theater or taking a break during a meeting as described above. It becomes a very easy sitting posture for the person P.

  Next, when the user P stands up from the chair 10A, first, as shown in FIG. 2 (b), the user P remains seated and the seat part 1 is rotated halfway (180 ° with respect to the leg part 3). ) Invert. FIG. 2C shows this state. That is, this figure shows a state in which the user P is integrally rotated with the armrest portion 5a and the backrest portion 5b in a half-rotation (180 °) state while the user P is seated on the seating portion 1.

  Then, since the user P is in the backward leaning posture in the state of FIG. 2 (b), the user P is in the forward leaning posture of the forward leaning angle α in the state of FIG. 2 (c). As shown in FIG. 2 (d), the user can easily and quickly stand up from the seating surface 1a of the chair 10A simply by pushing the front end of the armrest portion 5b with his / her hand. On the other hand, when sitting on the chair 10A, the user P sits in the forward leaning posture on the chair 10A in the state shown in FIG. By rotating (180 °), the backward tilt posture of FIG.

  Therefore, the chair 10A of the present embodiment is a chair that is easy to sit on and stand up, and therefore is very convenient and easy to use when the user P is, for example, a disabled person or an elderly person with weak legs.

  Although it is dangerous if the seating part 1 rotates unexpectedly while the user P stands up from the chair 10A, this phenomenon is caused by providing a brake lever, which is found in a known nursing chair, on the outer surface of the leg part 3, This can be easily solved by applying a brake to the seating section 1 just before the user P rises from the section 1. Since the configuration of the brake lever is well known in nursing chairs and the like, the description thereof is omitted here.

  As described above, the chair 10A of the present embodiment is characterized in that the tilting fulcrum K located at the position protruding in the direction of the floor surface F from the two-dot chain line connecting the front end 2e and the rear stage 2f of the pedestal 2 is characterized. However, the tilt angle α (FIGS. 2B to 2D) can be easily adjusted by moving the tilting fulcrum K of the pedestal 2 in the front-rear direction of the floor surface F.

  FIG. 3 specifically shows this, and FIG. 3A is a side view in which a part of the pedestal portion 2 is broken. That is, as shown in FIG. 3 (a), a plurality of female screw holes 2d are provided in the front-rear direction at a fixed pitch on the notch surface 2c of the pedestal 2, and the block 7 is bolted to an appropriate female screw hole 2d position. If it fixes by 7a, the position of the tilting fulcrum K of the base part 2 can be changed easily in the front-back direction. A two-dot chain line 2 in FIG. 3A shows the pedestal portion 2 after changing the tilt fulcrum K, and the left end portion of the ground contact surface 2a of the block 7 becomes the tilt fulcrum K of the pedestal portion 2 after change.

  Reference numeral 6 denotes a footrest. When such a footrest 6 is used, the user P's heel position is raised from the floor surface F, so that not only is the foot comfortable, but also the floor surface F and the front end of the pedestal portion 2 This has the effect of preventing the danger of wrinkles being caught in the gap R formed between the two.

  Further, as shown in FIG. 3B, the tilting fulcrum K is a front-rear direction of the back surface of the pedestal portion 2 with the interposed member 8 having a round bar 8b welded to the center of the plate-like body 8a as the tilting fulcrum K. It may be fixed at an appropriate position by the fixing method as described above. In this embodiment, there is no need to provide the notch surface 2b like the pedestal portion 2 in FIG. 3A, so that the shape of the pedestal portion 2 is simplified.

  The tilting fulcrum K shown in FIG. 3 is obtained by fixing the tilting fulcrum K that protrudes in the direction of the floor surface F from the line connecting the front end and the rear end of the pedestal 2 to the lower surface of the pedestal 2. However, the tilt fulcrum K can be provided not only on the lower surface of the pedestal portion 2 but also on the side surface of the pedestal portion 2. This aspect is illustrated in FIG.

  That is, FIG. 4 is an example in which the tilting fulcrum K is provided on the outer surface of the pedestal portion 2, FIG. 4 (a) is a side view of the pedestal portion 2, and FIG. 4 (b) is the pedestal of FIG. FIG. 4 is an enlarged plan view of a circular region E of part 2.

  As shown in these figures, three pins 9 projecting in parallel to the floor F from the both sides of the pedestal 2 in parallel to the floor F are cantilevered, and the front and rear intervals are fixed at equal intervals. Yes. And between the floor surface F and the said pin 9, the pin stand 10 which supports the said pin 9 is provided, and it supports so that the height from the floor surface F to the bottom face of the base part 2 may become Т. Yes. Therefore, in this figure, the pin supported by the pin cradle becomes the tilting fulcrum K of the entire chair 10A, and the pedestal portion 2 can be tilted backward as indicated by the two-dot chain line 2 in the figure.

  In this embodiment, the pin is provided on the outer side surface of the pedestal portion 2, but may be provided on the inner side surface.

Embodiment 2

  FIG. 5 is a side view of a chair 10B according to the second embodiment of the present invention, which is characterized in that a safety cover 11 is provided at the front end of the pedestal 2 of the chair 10B in FIG.

  In this figure, the same members as those in the chair 10A in FIG. 1 are denoted by the same reference numerals, and only different points will be described.

  As described above, when the chair 10B of the present invention is tilted backward, the front end of the pedestal portion 2 is lifted by a gap h with respect to the floor surface F, but when the chair 10B is tilted forward, the front end of the pedestal portion 2 is lifted. Since the unit is grounded, the user's heel may be pinched and the user may be injured. Therefore, the safety cover 11 in the present embodiment is configured to always cover the gap h that is lifted from the floor surface F.

  Various types of safety covers 11 of this type are conceivable, but there are two examples shown in FIG. 6 as an example. That is, the safety cover 11 in FIG. 6A is the same as the safety cover 11 provided in FIG. 5, and is a perspective view of a type of safety cover 11 in which the front half of the pedestal portion 2 is surrounded by a protection plate 11a. FIG. 6B is a perspective view of a safety platform 12 of the type in which a footrest 12a in which the user's foot position is raised from the floor F by the gap H is provided in the front half.

  Next, FIG. 7 is a three-side view of the safety cover 11 of the type shown in FIG. 6A, in which FIG. 7A is a plan view, FIG. 7B is a front view, and FIG. FIG.

  In the plan view of FIG. 7 (a), a two-dot chain line indicated by a symbol indicates the pedestal portion 2 of FIG. 5, and a two-dot chain line indicated by a symbol indicates the foot position of the user P. This protective plate type safety cover 11 has a front edge portion 11c of a rectangular plate 11b cut into the lower portion of the figure by the amount of the user's foot position, and the user's foot position and the first half of the pedestal portion 2 As shown in FIGS. 7 (b) and 7 (c), the protection between the sections has a height H (H> h) that is higher than the gap h above the floor surface F described above. The plate 11a is fixed by appropriate fixing means. Reference numeral K denotes a tilting fulcrum of the pedestal portion 2 in FIG. 5, and is fixed to the plate surface by appropriate fixing means such as bolting, adhesion, welding or the like.

  Therefore, according to the chair 10B of the present embodiment, the user sitting in the chair 10B moves his / her weight on the seating surface 1a with the tilting fulcrum K as a fulcrum, so that not only the backward leaning posture but also the forward leaning posture. Can also be taken.

  As shown in FIG. 5, even if the chair 10 </ b> B tilts backward to form a gap h between the front end portion of the pedestal portion 2 and the floor surface F, the user's foot position and the front half portion of the pedestal portion 2 are formed. Since the protective plate 11a having a height H (H> h) from the plate surface is fixed in between, even if the user tilts from a backward leaning posture to a forward leaning posture by moving his / her body, Is not pinched by the tip of the pedestal 2.

  FIG. 8 is a three-side view of the safety table 12 of the type provided with the footrest 12a of FIG. 6B, in which FIG. 8A is a plan view, FIG. 8B is a front view, FIG. (C) is a left side view.

  This type of safety stand 12 differs from the protective plate type safety cover 11 described above with reference to FIG. 7 in that the chair 10B in FIG. 5 is tilted backward in front of the plate 12b instead of the protective plate 11a at the front edge of the plate. 7 is that the footrest 12a having a height H (H> h) exceeding the height h of the gap R between the floor surface F and the lower surface of the pedestal portion 2 is provided, and the other points are the protection plates of FIG. The same as the type of safety cover 11.

  Therefore, according to the chair 10B of the present embodiment, since the user sitting in the chair 10B can use the tilting fulcrum K as a fulcrum, as in the chair 10B provided with the safety plate type safety cover 11, Not only the backward leaning posture but also the forward leaning posture can be taken. Further, since the user's feet are always higher than the height h of the gap R by the height H (H> h) of the footrest 12a, the pedestal portion even if the chair is tilted forward. 2 does not physically pinch your foot.

  In addition, this type of safety table 12 becomes very warm when the chair 10B is used in the winter if a known heat transfer heater is built in the footrest 12a, so if the user is an elderly person or a disabled person It will be very easy to use.

Embodiment 3

  FIG. 9 is a view of a pipe chair type pipe chair 10C according to the third embodiment of the present invention, in which FIG. 9 (a) is an overall perspective view, and FIG. 9 (b) is FIG. 9 (a). It is a fragmentary view which shows the use condition of 10C of chairs.

  In other words, the pipe chair 10C of the present embodiment is an improvement of a commercially available pipe chair to the pipe chair 10C of the present invention, and between the front leg 13 and the rear leg 14 of the pipe chair, a "" They are connected by a pair of connecting pipes 15 bent in a straight line. Although not shown, both ends of the connecting pipe 15 are divided into two grips for the front leg 13 and the rear leg 14, and can be firmly fixed to the front leg 13 and the rear leg 14 with bolts and nuts. ing.

  Therefore, as shown in FIG. 9B, the user sitting on the seating portion 1 also with the pipe chair 10C of the present embodiment moves the weight backward using the tilting fulcrum K as a fulcrum, so that the tilting fulcrum K is set. Since the lower end part of the rear leg 14 contacts the floor surface F as a fulcrum, it is possible to take a backward inclined posture integrally with the pipe chair 10C. Further, if the body's center of gravity G (FIG. 2) is moved forward, the lower end portion of the front leg 13 contacts the floor F with the tilting fulcrum K as a fulcrum, so that a forward tilting posture can be obtained.

  FIG. 10 shows another embodiment of the tilting fulcrum K, in which FIG. 9 (a) is a partial side view, and FIG. 9 (b) is a cross-sectional view taken along the line AA of the fulcrum part in FIG. 9 (a). FIG.

  This pipe chair is of the type in which the front leg 13 and the rear leg 14 are continuously connected at both ends in the width direction, and the upper part is connected to the existing pipe as shown in the cross-sectional view of FIG. An attachment opening 17a is provided, and an “abacus ball” -shaped tilting fulcrum member 17 protruding from the center is attached and fixed with a bolt 17b. Therefore, the maximum outer peripheral line of the “abacus ball” -shaped tilting fulcrum member 17 becomes the tilting fulcrum K, and the forward tilting posture or the rearward tilting posture can be easily taken. Therefore, the chair of this embodiment is a chair that is easy to sit and stand up.

Embodiment 4

  The pipe chair 10D according to the third embodiment described above is a pipe chair 10D according to the present embodiment that is not folded after use since the front leg 18 and the rear leg 19 of the commercially available pipe chair are connected by the connection pipe 15. In this case, a third leg 20 having a lower end 20b serving as a tilting fulcrum K is interposed between the front leg 18 and the rear leg 19 of a commercially available pipe chair so that it can be folded after use.

  Hereinafter, only the improved points will be shown using FIG. 11 and FIG. 12, but FIG. 11 is a side view showing a state opened from a two-dot chain line position in a state in which the pipe chair 10D is folded, and FIG. It is a side view which shows the state which folded pipe chair 10D.

  In FIG. 11, the upper end portion of the third leg 20 is pivoted to the support fitting 21 fixed to the front leg 18 by the upper pin 20 a of the third leg 20 being pin-coupled. It is supported. A folding pin 20c is also provided slightly below the upper pin 20a. One end of the front leg side link 22 and one end of the rear leg side link 23 are pin-coupled to the folding pin 20c. The other end portion of the front leg side link 22 is pin-coupled by a folding pin 18c positioned below the seat portion pin 18a of the front leg 18, while the other end portion of the rear leg side link 23 is a seat portion of the rear leg 19. The pin 19e is connected to the rear leg 19 by a folding pin 19c located below the support metal 19d.

  The rear leg 19 is provided with a rear leg upper pin 19d at its upper end pivotally supported by the support fitting 21 and provided on the support fitting 21 extending from the vicinity of the upper portion of the rear leg 19 in the seating 1 direction. The seat pin 19e is pin-coupled to the seat 1. Further, the rear leg 19 has a core-sheath structure in which the lower part is a cylinder 19A and the upper part is a piston 19B, and as shown by a two-dot chain line in FIG. The cylinder 19A can be advanced and retracted.

  Since the seating surface 1a is parallel to the floor surface F, the pipe chair 10D represented by the solid line in the figure shows a normal use state. That is, this state can be realized when the user sits on the seating portion 1 such that his / her weight is positioned in front of the lower end portion of the third leg 20.

  Next, as shown in FIG. 2B, when the user wants to move the viewpoint slightly upward, the user's weight is moved backward from the lower end portion 20 b of the third leg 20. This can be realized because the lower end portion 19b of the rear leg 19 contacts the floor surface F indicated by a two-dot chain line. In this case, although not shown, the third leg 20 stops at a position where the rear leg side link 23 extends in the front-rear direction (left-right direction in the figure) due to the weight of the user, and the rear leg 19 is indicated by a solid line in the figure. As shown, the upper end of the cylinder side rear leg 19A stops at a position where it abuts the lower end of the piston side rear leg 19B, and the third leg 20 and the rear leg 19 are stabilized at this position. Therefore, the pipe chair of the present embodiment is an easy chair to sit and stand up.

  When the pipe chair 10D is folded from the state of FIG. 11, the side view of FIG. 12 is obtained. That is, the third leg 20 pivots counterclockwise while being pivotally supported by the upper pin 20a, and contacts the front leg 18. On the other hand, the rear leg 19 has an upper end on the rear leg upper pin 19a. The cylinder side rear leg 19 </ b> A is pulled down at the other end of the rear leg side link 23 while rotating in the counterclockwise direction while being pivotally supported. On the other hand, the seating portion 1 is housed in the standing state in the figure as the seating portion pin 19e rotates counterclockwise around the pin 18a.

  In the above embodiment, examples of various types of chairs 10A to 10D according to the present invention have been described. However, the present invention is not limited to the above embodiment, and the scope of the technical idea shown in the claims. The present invention can be modified into various modified examples or applied examples, and these modified examples are also included in the scope of the present invention.

  The chair according to the present invention, which is easy to sit and stand up, is particularly suitable as a chair for care for the handicapped and the elderly, but for example, a movie theater seat, a rear seat of a taxi, a conference pipe It is particularly useful for applications that require a slightly upward and downward sitting posture, such as a chair.

Claims (4)

In a chair provided with a seating portion on which a user sits, a leg portion connected to the lower side of the seating portion, and a pedestal portion connected to a lower end of the leg portion and having a grounding surface extending in a predetermined length in the front-rear direction,
Near the midpoint between the front end and the rear end of the pedestal, and between the grounding surface of the pedestal and the floor, the seating surface of the seat is rearward with respect to the floor A chair characterized by a tilting fulcrum. The chair according to claim 1, wherein
The tilting fulcrum is a projecting portion provided on the lower surface of the pedestal portion and projecting in the floor surface direction from a line connecting the front end portion and the rear end portion,
The seating part is provided with a rotary bearing between the leg part and the seating part,
A seat characterized in that a seating surface of the seating portion rotates with respect to a floor surface. In the chair according to claim 1 or claim 2,
A chair provided with a safety cover for preventing a user's foot from being sandwiched between the floor and the front end of the seat by surrounding the periphery of the front end of the seat. In the chair according to any one of claims 1 to 4,
By forming the lower portion of the seating portion into a “<” shape protruding in the floor direction, the tilting operation of the seating portion has added a forward tilting posture in addition to the backward tilting posture 2 A chair characterized by a movement consisting of postures.

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