TWI879678B - Base frame of electric chair and electric chair having the same - Google Patents

Abstract

The present invention reveals a base frame of electric chair, which has a first base, a second base, and a third base. The second base is provided on the first base and can tilt backward. The third base is provided on the second base and can move up and down. The third base is pulled up and down by an electric lifting telescopic rod. When the third base reaches the lowest position, where the third base can no longer go down, the second base can be driven to tilt backwards. As such, the lifting and the tilting can be controlled by a single telescopic rod. It provides the function of freely adjusting height at a controllable cost and has excellent market value.

Description

Electric chair base and electric chair comprising the same

The present invention relates to an electric chair.

Existing electric chairs, such as those described in Patent No. TWI548372, can allow users to lie on their backs, and present a specific forward angle between the seat frame, the back frame and the leg frame, and can support the user's back, buttocks and legs with three support surfaces at specific angles, providing the use function commonly known as a "weightless chair" or "zero gravity chair".

On the other hand, since the elderly or people with limited mobility may have difficulty standing up from a sitting position due to degeneration of the knees, other joints or muscles, there are standing chairs that can assist in standing up. The seat of the chair can be driven by electricity to swing and tilt forward and the rear side can be raised to directly lift the user's buttocks and push forward, making the user's posture close to standing up, thus making the action of standing up more labor-saving and easier.

In order to improve the comfort and user experience of the standing chair, the backrest and legrest of the standing chair can usually be tilted or raised and lowered by electric drive. For example, Patent No. TWM487727 describes a standing chair. When standing up, the seat cushion is tilted forward by a telescopic power device, and the backrest is tilted and swung forward at the same time, so that the back moves forward to facilitate standing up, and the legrest is retracted backward to avoid hindering standing up. In addition, when sitting, the seat cushion can also be tilted backward by the telescopic power device, and the backrest lies backward and the legrest extends forward and upward, providing the user with a lying posture of a "weightless chair" that is both comfortable and labor-saving.

However, there is still room for improvement in the control of the seat height of existing stand-up chairs. Because people's heights and the lengths of different parts of their trunks are different, the seat height slightly above the knee and slightly below the knee may only differ by less than 5 cm, but it will bring a huge difference in feeling to the user, especially when the stand-up chair is tilted to assist in standing up, an inappropriate seat height may cause the user to have difficulty standing up or fall due to poor balance. The electric chair and stand-up chair in the above-mentioned patents TWI548372 and TWM487727 can only be adjusted according to the user's customization, or a telescopic power device is added to adjust the seat height, which will greatly increase the cost and selling price of the stand-up chair.

One of the purposes of the present invention is to provide an electric chair that has the function of adjusting the seat height without making the structure too complicated and increasing the cost.

Accordingly, the present invention provides an electric chair base, comprising a first base, a second base, a third base, a first connecting rod assembly and a lifting and telescopic rod. The second base is arranged on the first base and can swing relative to the first base around a horizontal axis. The first connecting rod assembly is connected to the second base and the third base, so that the third base can move up and down between a lowered position close to the second base and an ascended position far from the second base. The lifting telescopic rod is connected to the third base and one of the first connecting rod groups and the first base. The lifting telescopic rod can be telescopically moved between a first lifting length, an intermediate lifting length and a second lifting length, wherein the intermediate lifting length is between the first lifting length and the second lifting length. When the lifting telescopic rod is telescopically moved between the first lifting length and the intermediate lifting length, the third base is driven to be lifted and lowered between the rising position and the falling position. When the lifting telescopic rod is at the intermediate lifting length, the third base is located at the falling position. When the lifting telescopic rod is telescopically moved between the intermediate lifting length and the second lifting length, the second base swings around the horizontal axis relative to the first base.

In the aforementioned electric chair base, the first connecting rod assembly may further include a first lifting rod and an auxiliary rod, one end of the first lifting rod is slidably and pivotally arranged on one of the second base and the third base, and the auxiliary rod is pivotally connected to one of the second base and the first lifting rod, and the other end of the first lifting rod is pivotally connected to the other of the second base and the third base. When the first lifting rod and the auxiliary rod are pivotally connected, the third base can be lifted and moved between the lowered position and the raised position.

In the aforementioned electric chair base, the first connecting rod assembly may further include a first balancing rod, one end of which is slidably and pivotally arranged on one of the second base and the third base along with the first lifting rod, and the other end of which is pivotally connected to the other of the second base and the third base.

In the aforementioned electric chair base, one of the second base and the third base may further include a slide rail, the first connecting rod assembly includes a slide seat, the slide seat is slidably disposed on the slide rail, the first lifting rod is pivoted to the slide seat, and preferably, the first balance rod is also pivoted to the slide seat.

In the aforementioned electric chair base, the first connecting rod assembly may further include a booster rod, which is connected to one of the auxiliary rod and the first lifting rod and swings together with it. One end of the lifting and telescopic rod is pivotally connected to the booster rod, and the other end is pivotally connected to the first base.

The aforementioned electric chair base may further include a fourth base, a secondary base and a standing telescopic rod. The fourth base can swing relative to the third base. The fourth base has a limit portion. The secondary base is pivoted to the fourth base and can swing relative to the fourth base to lean against or not against the limit portion. The standing telescopic rod is connected to the third base and the secondary base. The standing telescopic rod can be telescopically moved between a first standing length, an intermediate standing length and a second standing length. , the middle standing length is between the first standing length and the second standing length, when the standing telescopic rod stretches and moves between the first standing length and the middle standing length, the auxiliary base is driven to swing relative to the fourth base, when the standing telescopic rod is at the middle standing length, the auxiliary base abuts against the limiting portion, when the standing telescopic rod moves from the middle standing length to the second standing length, the auxiliary base abuts against the limiting portion and pushes the fourth base to swing relative to the third base.

The aforementioned electric chair base may further include a second connecting rod assembly, which includes a second lifting rod and a second balancing rod. The second lifting rod is pivoted to the third base and the fourth base, and the second balancing rod is pivoted to the third base and the fourth base. The third base, the second lifting rod, the fourth base and the second balancing rod form a four-link mechanism so that the fourth base can be swung closer to or farther away from the third base.

Secondly, the present invention also provides an electric chair, including a seat and a backrest, the seat and the backrest are located above the third base of the aforementioned electric chair base, and will be driven to move on the third base. Preferably, the seat can be set on the fourth base and the backrest can be set on the auxiliary base.

Thereby, the present invention can utilize a single mechanism of the lifting and retractable rod to control the lifting and backward tilting of the third base, so that the electric chair has the function of adjusting the seat surface height and the seat reclining. In addition, the single mechanism of the standing up and retractable rod can be further utilized to control the forward tilting swing of the fourth base and the backward tilting swing of the auxiliary base, so that the electric chair has the function of assisting standing up and the backrest reclining. By utilizing limited mechanisms and components and without excessively increasing costs, sufficient usage functions are provided.

In order to enable you to have a further understanding of the present invention, a preferred embodiment is given below with accompanying drawings:

Please refer to Figures 1 to 3. The present invention discloses an electric chair, including an electric chair base at the bottom and a seat portion 10, a backrest 20 and a footrest 30 mounted on the electric chair base. Imagine that a human body sits on the seat portion 10 and leans against the backrest 20, and the upper and lower longitudinal directions can be defined as the upper and lower directions in Figure 1, the left and right transverse directions can be defined as the lower left to upper right directions in Figure 1, and the front and rear directions can be defined as the upper left and lower right directions in Figure 1. Depending on the use requirements and form of the electric chair, the backrest 20 and the footrest 30 can be removed and omitted, and the seat back bracket, footrest connecting rod assembly, footrest telescopic rod and other related mechanisms used to install the seat back 20 and the footrest 30 in the electric chair base described later can be removed and omitted. The seat portion 10, the backrest 20 and the footrest 30 are used to provide functions such as support, cushioning and soft and comfortable touch for the human body, and can provide support for the buttocks, back and legs of the human body respectively. The backrest 20 is preferably extended upward or connected to another cushion to form a headrest 21. The interior or surface of the seat portion 10, the backrest 20 and the footrest 30 may be provided with appropriate massage, heating, insulation, ventilation and other equipment or a combination of any number of these functions depending on the use requirements, so as to provide multiple use functions in the electric chair.

4 to 6 , the electric chair base includes a first base 40 , a second base 50 , a third base 60 , a first connecting rod assembly 70 , a lifting telescopic rod 80 , a fourth base 90 , a secondary base 100 , a standing telescopic rod 110 , a second connecting rod assembly 120 , a footrest connecting rod assembly 130 and a footrest telescopic rod 140 . It is necessary to explain in particular that since the electric chair and the electric chair base are roughly bilaterally symmetrical structures, for the convenience of explanation, the present invention mainly uses the side view angle to explain the overall structure by means of the necessary left or right structures. The rods and connecting rods mentioned in the present invention may use a single rod under the condition of having appropriate cross-sectional shapes and sizes, but are not limited to the use of a single long strip of rods, and may also be paired rods, grouped rods, I-shaped frames, U-shaped frames, S-shaped frames or other similar structures with a straight line on the side.

The first base 40 is located at the bottom of the electric chair base for placement on the ground or other stable support. Other sound-absorbing pads or cushioning pads may also be added below the first base 40. The first base 40 has a hinge portion 41 and a hinge seat 42. Specifically, the hinge portion 41 is a through hole extending along a horizontal axis in the transverse direction.

The second base 50 is arranged on the first base 40 and can swing relative to the first base 40 around the horizontal axis defined by the hinge portion 41. Specifically, the second base 50 is hinged to the hinge portion 41 of the first base 40. The second base has a mounting portion 51, a supporting portion 52 and a hinge seat 53. The mounting portion 51 is located at the rear side of the hinge portion 41, the supporting portion 52 is located at the front side of the hinge portion 41, and the lower side of the supporting portion 52 abuts against the first base 40, so that the second base 50 can only swing backward but not forward when swinging. The hinge seat 53 is located at the front side of the supporting portion 52. The second base also has a slide rail 54, and the slide rail 54 is installed and fixed to the mounting portion 51.

The first connecting rod assembly includes a first lifting rod 71, an auxiliary rod 72, a first balancing rod 73, a sliding seat 74 and a boosting rod 75. The bottom end of the first lifting rod 71 is slidably and pivotally arranged on the second base 50, and the top end is pivotally connected to the third base 60. The bottom end of the auxiliary rod 72 is pivotally connected to the pivot seat 53 of the second base 50, and the top end is pivotally connected to the first lifting rod 71, so that when the first lifting rod 71 and the auxiliary rod 72 are pivotally connected, the third base 60 can be lifted and lowered relative to the second base 50. movement; more specifically, the bottom end of the first lifting rod 71 is pivoted to the slide 74, and the slide 74 is slidably disposed on the slide rail 54, so that the first lifting rod 71 can slide and swing relative to the second base 50; in other possible embodiments of the present invention, if the bottom end of the first lifting rod has a protrusion and the second base has a groove, the protrusion of the first lifting rod is slidably and rotatably disposed in the groove of the second base, and the aforementioned slide rail and slide can be removed and omitted. The first balancing rod 73 is arranged in the same structure as the first lifting rod 71, with the bottom end pivotally connected to the slide 74 and the top end pivotally connected to the third base 60, so that the first balancing rod 73 can support and drive the third base 60 to move together with the first lifting rod 71, so that the third base 60 can maintain translation without tilting or only slightly swing when it moves up and down. However, if the third base 60 has other mechanisms to assist in maintaining translation, or the third base 60 can be allowed to swing, the first balancing rod 73 can also be removed and omitted. For example, if the top end of the auxiliary rod is extended upward and the end is slidably and pivotally arranged on the third base, the auxiliary rod can help the third base maintain balance. The boosting rod 75 is connected to the auxiliary rod 72 and swings together with the auxiliary rod 72. To be more specific, the first connecting rod assembly also includes a pivot shaft 76. The auxiliary rod 72 and the boosting rod 75 are directly connected to the pivot shaft 76, and the pivot shaft 76 is rotatably arranged on the pivot seat 53. In other possible embodiments of the present invention, if the boosting rod 75 is directly connected to the auxiliary rod 72, or the boosting rod 75 is directly or indirectly connected to the first lifting rod 71, it is a feasible specific implementation method.

One end of the lifting and telescopic rod 80 is pivoted to the boosting rod 75, and the other end is pivoted to the pivot seat 42. When the lifting and telescopic rod 80 is extended and moved, the boosting rod 75 can push the auxiliary rod 72 to swing, and further drive the auxiliary rod 72 and the first lifting rod 71 to pivot and move the third base 60. The boosting rod 75 can provide a better pivot position for the lifting and telescopic rod 80 to output a better torque to the auxiliary rod 72. In other possible embodiments of the present invention, the lifting and telescopic rod can also be directly pivoted to the auxiliary rod to move the boosting rod. In addition to omitting or pivoting the lifting and telescopic rod to other components of the first connecting rod assembly, such as the first lifting rod, the first lifting rod and the auxiliary rod can still be driven to pivot when the lifting and telescopic rod is extended and moved; in addition, if the top end of the lifting and telescopic rod is pivoted or connected to the third base directly or indirectly through other mechanisms, the lifting and telescopic rod can also drive the third base to move up and down. At this time, the first connecting rod assembly may also be replaced by a slide rail extending vertically or obliquely, so that the third base can move up and down relative to the second base.

7 to 9, the lifting telescopic rod 80 can be telescopically moved between a first lifting length, an intermediate lifting length, and a second lifting length, wherein the intermediate lifting length is between the first lifting length and the second lifting length. As shown in FIG. 7, when the lifting telescopic rod 80 is at the intermediate lifting length, the third base 60 is at a lowered position, at which time the slide 74 is at the rear end of the slide rail 54, and the third base 60 cannot be further lowered. As shown in FIG7 and FIG8, when the lifting telescopic rod 80 is extended by telescopic movement from the middle lifting length to the first lifting length, the lifting telescopic rod 80 pushes the booster rod 75, thereby driving the auxiliary rod 72 and the first lifting rod 71 to pivot, and the slide 74 moves forward along the slide rail 54, so that the third base 60 moves upward to the ascending position. As shown in FIG7 and FIG9, when the lifting telescopic rod 80 is shortened by telescopic movement from the middle lifting length to the second lifting length, because the third base 60 is already in the descending position and cannot be further descended, the third base 60 pushes against the second base 50 through the pivot shaft 76 and the pivot seat 53 and the slide 74 and the slide rail 54, so that the second base 50 tilts backward.

Referring to FIGS. 4 to 6 , the fourth base 90 is located above the third base 60. The fourth base 90 can be used to fix the seat portion. The second connecting rod assembly is connected between the fourth base 90 and the third base 60 so that the fourth base 90 can swing relative to the third base 60. More specifically, the second connecting rod assembly includes a second lifting rod 121 and a second balancing rod 122. The second lifting rod 121 and the second balancing rod 122 are respectively connected to the third base 60. The third base 60 and the fourth base 90, the second lifting rod 121, the fourth base 90, the second balance rod 122 and the third base 60 form a planar four-link mechanism so that the fourth base 90 can swing closer to or farther from the third base 60; however, if the fourth base 90 is pivoted to the third base 60, thereby removing and omitting the second link assembly, the fourth base 90 can still have the ability to swing relative to the third base. The fourth base 90 has a pivot portion 91 and a limit portion 92 at the rear side.

The auxiliary base 100 is pivoted to the pivot portion 91 of the fourth base 90 and is located at the rear side of the fourth base. The auxiliary base 100 extends upward and has a seat back support 101 for fixing the seat back. The auxiliary base 100 has a support seat 102. When the auxiliary base 100 is pivoted relative to the fourth base 90, the support seat 102 will approach and abut against the limit portion 92 or move away from and not abut against the limit portion 92.

The telescopic rod 110 is pivotally connected to the third base 60 and the auxiliary base 100. When the telescopic rod 110 is extended and moved, it can push the auxiliary base 100 and/or the fourth base 90 to swing. Please refer to Figures 10 to 12. The telescopic rod 110 can be extended and moved between the first standing length, the middle standing length and the second standing length, wherein the middle standing length is between the first standing length and the second standing length. As shown in FIG10 and FIG11, when the standing telescopic rod 110 is extended and moved between the first standing length and the middle standing length, the fourth base 90 is against the third base 60 or the second connecting rod assembly as shown in FIG6 and cannot swing downward, and the standing telescopic rod 110 drives the auxiliary base 100 to swing relative to the fourth base 90. Since the backrest is fixed to the auxiliary base 100, the swing of the auxiliary base 100 can further control the tilt and upright position of the backrest. As shown in FIG11, when the standing telescopic rod is at the middle standing length, the auxiliary base 100 swings until the abutting seat 102 contacts the abutting limit portion 92, and the backrest of the chair will be in an upright position accordingly. As shown in Figures 11 and 12, when the standing telescopic rod 110 is further extended and moved from the middle standing length to the second standing length, the auxiliary base 100 abuts against the limiting portion 92, so that the auxiliary base 100 cannot swing upward relative to the fourth base 90. The standing telescopic rod 110 is extended to the second standing length so that the auxiliary base 100 pushes the fourth base 90 upward through the limiting portion 92, so that the fourth base 90 swings relative to the third base 60. Since the seat is fixed to the fourth base 90, the forward tilting swing of the fourth base as shown in Figure 12 will provide an effect of assisting standing up.

4 to 6 , the footrest connecting rod assembly 130 and the footrest telescopic rod 140 are disposed on the third base. The footrest connecting rod assembly 130 can be used to fix the footrest portion 30, and the footrest telescopic rod 140 drives the connecting rod mechanism of the footrest connecting rod assembly 130 to translate and swing, thereby pushing the footrest portion 30 to extend, unfold, and retract.

The electric chair base can achieve the functions of assisting the user to stand up and adjusting the height of the seat surface. Please refer to Figures 6 and 13. The lifting and retracting rod 80 can be extended to drive the first lifting rod 71 and the auxiliary rod 72 of the first connecting rod group to swing, drive the third base 60 to move up and down, and the seat 10, the backrest 20 and the footrest 30 arranged above the third base 60 are also raised and lowered to adjust the height. Please refer to Figures 13 and 14. The standing up retractable rod 110 can be extended to drive the auxiliary base 100 and the fourth base 90 to swing forward, so that the seat 10 and the backrest 20 are tilted forward, which can assist the user to stand up. Since the functions of adjusting the height and assisting in getting up are respectively derived from the lifting and retractable rod driving the third base to rise and the rising and retractable rod driving the fourth base to swing, the height of the third base will not affect the swinging of the fourth base and its function of assisting in getting up. The function of assisting in getting up can be activated normally when the seat portion 10 is adjusted to any height, so that the electric chair can adjust the seat height as required by the user.

In addition to the above functions, the electric chair base of the present invention can also provide a reclining position, or even a lying position commonly known as a "weightless chair". Please refer to Figure 15. The standing telescopic rod 110 can also be shortened to drive the auxiliary base 100 to tilt backward, so that the chair back 20 can tilt backward. At the same time, the footrest telescopic rod 140 can drive the footrest connecting rod assembly 130 to push the footrest part 30 forward and unfold it, allowing the user to lie down. Please refer to Figures 15 and 16. The lifting telescopic rod 80 can be further shortened to drive the second base 50 to tilt backward, allowing the user to lie further back and obtain a more comfortable lying position.

It should be specially noted that the above-mentioned electric chair has the functions of adjusting height, assisting to stand up and lying down as a "weightless chair". However, if only the height adjustment and tilting of the seat are required, the second connecting rod assembly, the fourth base, the auxiliary base, the standing telescopic rod and other components are removed and omitted, and the seat part is directly or indirectly set on the third base. This is also a possible specific implementation method of the present invention.

Please refer to FIG. 17 and FIG. 18 , in another embodiment of the present invention, the first lifting rod, the auxiliary rod and the first balancing rod in the first connecting rod assembly can also be arranged upside down without affecting the aforementioned use functions. In more detail, the top end of the first lifting rod 71 is slidably and pivotally arranged on the third base 60, and the bottom end is pivotally connected to the pivot seat 53 of the second base 50. The top end of the auxiliary rod 72 is pivotally connected to the third base 60, and the bottom end is pivotally connected to the first lifting rod 71, so that when the first lifting rod 71 and the auxiliary rod 72 are pivotally connected, the third base 60 can be lifted and moved relative to the second base 50. To further explain, the top end of the first lifting rod 71 is pivotally connected to the slide 74, and the third base 60 has a slide rail 61. The slide 74 is slidably arranged on the slide rail 61, so that the first lifting rod 71 can slide and swing relative to the third base 60. The first balance bar 73 is arranged in the same structure as the first lifting bar 71, with the top end pivoted to the slide 74 and the bottom end pivoted to the second base 50, so that the first balance bar 73 can support and drive the third base 60 to move together with the first lifting bar 71, so that the third base 60 can maintain horizontal movement without tilting or only slightly swinging when it moves up and down. The booster rod 75 is connected to the first lifting rod 71 and swings together with the first lifting rod 71. The lifting and telescopic rod 80 is pivoted to the booster rod and the pivot seat 42 of the second base. When the lifting and telescopic rod 80 is extended and moved, the booster rod 75 can drive the first lifting rod 71 to pivot, thereby driving the third base 60 to move up and down, or after the third base 60 is lowered to the lowering position and cannot be further lowered, the third base 60 pushes against the second base 50 to make the second base 50 tilt and pivot, thereby realizing the same use function as the above-mentioned embodiment.

To summarize the above description, the present invention provides the functions of adjusting the height and tilting the seat surface with the lifting and retracting rods and related components in the electric chair base. The mechanism is simple and the functions are diverse. If the retractable rod for standing up and related components are added, it will be more complete and have the functions of adjusting the height, assisting standing up and lying down as a "weightless chair". The mechanism is simple and the movements of the components are easy to understand, which is helpful for the control system and related operating settings, and can effectively control the manufacturing cost, and has great market value.

10: Seat 20: Back 21: Headrest 30: Footrest 40: First base 41: Pivot 42: Pivot seat 50: Second base 51: Mounting 52: Support 53: Pivot seat 54: Slide 60: Third base 61: Slide 70: First connecting rod 71: First lifting rod 72: Auxiliary rod 73: First balance rod 74: Slide 75: Power rod 76: Pivot shaft 80: Lifting and telescopic rod 90: Fourth base 91: Pivot 92: Limiting part 100: Sub-base 101: Seat back support 102: Backrest 110: Retractable rod for lifting 120: Second connecting rod assembly 121: Second lifting rod 122: Second balance rod 130: Footrest connecting rod assembly 140: Footrest retractable rod

Figure 1: A three-dimensional diagram of the electric chair of the first embodiment of the present invention. Figure 2: A three-dimensional exploded diagram of the electric chair of the first embodiment of the present invention. Figure 3: A three-dimensional exploded diagram of the electric chair of the first embodiment of the present invention from another perspective. Figure 4: A three-dimensional exploded diagram of the base of the electric chair of the first embodiment of the present invention. Figure 5: A partial three-dimensional exploded diagram of the base of the electric chair of the first embodiment of the present invention. Figure 6: A side view of the electric chair of the first embodiment of the present invention. Figure 7: A schematic diagram of the mechanism of the first base, the second base and the third base of the base of the electric chair of the first embodiment of the present invention. Figures 8 to 9: Schematic diagrams of the lifting and retracting rod of the base of the electric chair of the first embodiment of the present invention. Figure 10: A schematic diagram of the mechanism of the third base, the fourth base and the auxiliary base of the base of the electric chair of the first embodiment of the present invention. Figures 11 to 12: Schematic diagram of the rising and retracting rod of the electric chair base of the first embodiment of the present invention. Figure 13: Schematic diagram of the height adjustment of the electric chair of the first embodiment of the present invention. Figure 14: Schematic diagram of the assisted rising action of the electric chair of the first embodiment of the present invention. Figure 15: Schematic diagram of the lying down action of the electric chair of the first embodiment of the present invention. Figure 16: Schematic diagram of the "zero gravity chair" action of the electric chair of the first embodiment of the present invention. Figure 17: Side view of the electric chair of the second embodiment of the present invention. Figure 18: Schematic diagram of the mechanism of the first base, second base and third base of the electric chair base of the second embodiment of the present invention.

50: Second base

51: Installation Department

52: Supporting part

53: hinged socket

54: Slide rail

60: The third base

71: First lift rod

72: Auxiliary rod

73: First balance bar

74: Sliding seat

75: Power lever

76: Articulated shaft

80: Lifting and retracting rod

121: Second lift rod

122: Second balance bar

Claims (10)

An electric chair base, comprising: a first base; a second base, disposed on the first base and capable of swinging relative to the first base around a horizontal axis; a third base; a first connecting rod assembly, connected to the second base and the third base, so that the third base can be raised and lowered between a lowered position close to the second base and an raised position far from the second base; A lifting telescopic rod is connected to the third base and one of the first connecting rod groups and the first base. The lifting telescopic rod can be extended and moved between a first lifting length, an intermediate lifting length and a second lifting length. The intermediate lifting length is between the first lifting length and the second lifting length. When the lifting telescopic rod is extended and moved between the first lifting length and the intermediate lifting length, the third base is driven to move between the rising position and the falling position. When the lifting telescopic rod is at the intermediate lifting length, the third base is located at the falling position. When the lifting telescopic rod is extended and moved between the intermediate lifting length and the second lifting length, the second base swings around the horizontal axis relative to the first base. An electric chair base as described in claim 1, wherein the first connecting rod assembly includes a first lifting rod and an auxiliary rod, one end of the first lifting rod is slidably and pivotally arranged on one of the second base and the third base, and the auxiliary rod is pivotally connected to one of the second base and the first lifting rod, and the other end of the first lifting rod is pivotally connected to the other of the second base and the third base. When the first lifting rod and the auxiliary rod are pivotally connected, the third base can be raised and lowered between the lowered position and the raised position. The electric chair base as described in claim 2, wherein the first connecting rod assembly also includes a first balancing rod, one end of which is slidably and pivotally arranged on one of the second base and the third base along the first lifting rod, and the other end is pivotally connected to the other of the second base and the third base. The electric chair base as described in claim 2, wherein one of the second base and the third base includes a slide rail, the first connecting rod assembly includes a slide seat, the slide seat is slidably disposed on the slide rail, and the first lifting rod is pivotally connected to the slide seat. The electric chair base as described in claim 3, wherein one of the second base and the third base includes a slide rail, the first connecting rod assembly includes a slide seat, the slide seat is slidably disposed on the slide rail, the first lifting rod is pivoted on the slide seat, and the first balancing rod is pivoted on the slide seat. The electric chair base as described in claim 2, wherein the first connecting rod assembly also includes a power-assisting rod, which is connected to one of the auxiliary rod and the first lifting rod and swings therewith, and one end of the lifting and telescopic rod is pivotally connected to the power-assisting rod, and the other end is pivotally connected to the first base. The electric chair base as described in any one of claims 1 to 6 further includes a fourth base, a secondary base and a standing telescopic rod, the fourth base can be swung relative to the third base, the fourth base has a limit portion, the secondary base is pivoted to the fourth base and can be pivoted relative to the fourth base to lean against or not against the limit portion, the standing telescopic rod is connected to the third base and the secondary base, and the standing telescopic rod can be extended between a first standing length, an intermediate standing length and a second standing length. The middle standing length is between the first standing length and the second standing length. When the standing telescopic rod stretches and moves between the first standing length and the middle standing length, the auxiliary base is driven to swing relative to the fourth base. When the standing telescopic rod is at the middle standing length, the auxiliary base abuts against the limiting portion. When the standing telescopic rod moves from the middle standing length to the second standing length, the auxiliary base abuts against the limiting portion and pushes the fourth base to swing relative to the third base. The electric chair base as described in claim 7 further includes a second connecting rod assembly, which includes a second lifting rod and a second balancing rod. The second lifting rod is pivoted to the third base and the fourth base, and the second balancing rod is pivoted to the third base and the fourth base. The third base, the second lifting rod, the fourth base and the second balancing rod form a four-link mechanism so that the fourth base can be swung closer to or away from the third base. An electric chair comprises an electric chair base as described in any one of claims 1 to 6, and further comprises a seat portion and a backrest portion, wherein the seat portion and the backrest portion are located above the third base and are moved by the third base when the third base moves. An electric chair comprises an electric chair base as described in any one of claims 7 to 8, and further comprises a seat portion and a backrest portion, wherein the seat portion is disposed on the fourth base and moves therewith, and the backrest portion is disposed on the auxiliary base and moves therewith.

Images