TWI577315B - Electric chair - Google Patents

Description

Electric chair

The present invention relates to an electric chair, and more particularly to an electric chair capable of driving a portion for resting a foot to retract under the seat or to extend forward of the seat.

Today's common electric chairs include electric massage chairs, electric recliners, and (especially luxury) passenger seats on large vehicles such as buses, trains, airplanes, etc., mostly to support the user's calves and/or feet. The footrest unit, and the electric chair can usually electrically control the footrest unit to change its support angle to meet the user's use requirements. In addition, some electric chairs can also drive the footrest unit from the seat. The front side is retracted under the seat to reduce the seat space when no one is riding or someone is riding but does not need to use the footrest unit. In the prior art, the electric chair that can drive the footrest unit between the use state and the storage state, and can control the footrest unit in the use state to change its support angle, the related structure is usually very complicated, and some even Two sets of driving devices (mainly including a motor) and a linking mechanism are required to respectively control the infesting action and the angle changing action of the footrest unit, so the manufacturing cost is high. On the other hand, since the electric chair is retracted under the seat by the front of the seat by the power forcing foot unit, there is a problem of safety of the user who pinches.

The main object of the present invention is to provide an electric chair that can electrically drive the footrest unit to be retracted under the seat to present the storage state or to extend the front of the seat for use, and to control the support under the use state. The angle is matched to the user's use requirements; and the structure of the present invention is simpler and the manufacturing cost is lower than that of the conventional electric chair that can achieve the same function.

Another object of the present invention is to provide an electric chair that can electrically drive the footrest unit to be retracted under the seat to present a stored state or to extend the front of the seat for use. And can control the support angle in the use state to meet the user's use requirements; moreover, the electric chair of the present invention can effectively avoid the process of driving the footrest unit below the seat into the seat under the seat. An accident such as a pinching of the human body occurs.

In order to achieve the foregoing main object, according to one aspect of the present invention, the electric chair includes: a base for being disposed on a support surface, having a left side portion and a right side portion, between the left side portion and the right side portion Forming a storage space, the front end of the storage space has an opening; each of the left side portion and the right side portion is provided with a guide rail, and each of the guide rails extends from a first position to a second position and then extends to a third position and then extends to a fourth position; the left side portion and the right side portion are further provided with a support portion; a seat unit is disposed above the storage space of the base, and has a buttock support portion for supporting a user's buttocks; The back unit is disposed at the rear of the seat unit and has a back support portion for supporting the back of the user; a footrest unit having a lower leg support portion for supporting the user's lower leg and a support for the user a sole support portion of the sole, a back surface facing the calf support portion, a bottom surface facing the foot support portion, and at least one of the back surface and the bottom surface a branching wheel near the ground, two leading portions on the left and right sides, and two abutting portions respectively on the left and right sides; the two leading portions are respectively fitted on the two guide rails of the base, And moving along the rail; the footrest unit can enter and exit the storage space through the opening of the base; a driving device for driving the leading portion of the footrest unit to move along the guide rail of the base; Wherein, when the leading portion is in the first position of the guide rail, the footrest unit is mostly in the storage space, the back surface faces downward, the bottom surface faces forward; and when the leading portion is in the second position of the guide rail The footrest unit has a majority of the volume in front of the base, the back surface faces downward, the bottom surface faces forward, and the ground support wheel supports the support surface; when the leading portion is in the third position of the guide rail, The footrest unit has a majority of the volume in front of the base, and the top end of the leg support portion is adjacent to the front end of the seat unit, front The ground support wheel is supported on the support surface, and a first angle is formed between the back surface and the support surface; when the leading portion is in the fourth position of the guide rail, the footrest unit is mostly in front of the base The top end of the calf support portion is adjacent to the front end of the seat unit, and the two abutting portions are respectively supported by the two support portions of the base, so that the footrest unit floats away from the support surface, the back surface and the foregoing A second angle is formed between the support surfaces that is smaller than the first angle.

In order to achieve the foregoing other object, in accordance with an aspect of the present invention, each of the aforementioned guide rails of the base has a continuous first section, a second section and a third section, and the first section corresponds to a bottom portion of the storage space extends forward from the first position at a rear end of the storage space to a second position corresponding to a front end of the storage space; and the second portion extends upward from the second position to The third position; the third section extends from the third position to the fourth position that is later than the third position; the left side portion and the right side portion of the base are respectively provided with a rack, each of The rack extends at least along the second section and the third section of the corresponding rail; the footrest unit is provided with a rotating shaft corresponding to the left and right axial directions, and the left and right ends of the rotating shaft are coaxially fixed with a gear. Each of the gears can be rolled along the aforementioned guide rails of the corresponding side, and the section having the foregoing rack meshes with the rack; the portion of the footrest unit corresponding to the left and right ends of the rotating shaft The driving device comprises a motor disposed on the footrest unit for driving the rotating shaft; and the first section of each of the guiding rails defines at least one third of a length from the rear end to define a safety a section, the foregoing rack does not extend to the aforementioned safety section; when the aforementioned leading portion of the footrest unit is in the aforementioned safety section and the aforementioned rotating shaft is driven by the motor, if the footrest unit is subjected to a certain degree or more unexpected Resistance, the aforementioned gear will idle in place, otherwise the aforementioned gear will roll along the aforementioned guide rail.

10‧‧‧Electric chair

20‧‧‧ Pedestal

21‧‧‧ left side

22‧‧‧ right side

23‧‧‧Storage space

24‧‧‧rail

241‧‧‧ first section

242‧‧‧Second section

243‧‧‧ third section

244‧‧‧Safe section

25‧‧‧ rack

26‧‧‧Support

30‧‧‧ seat unit

40‧‧‧back unit

50‧‧‧First drive

60‧‧‧Hand unit

61‧‧‧ Arm support

70‧‧‧foot unit

71‧‧‧left side

72‧‧‧ right side

73‧‧‧ septum

74‧‧‧ 容容

75‧‧‧Back

76‧‧‧ bottom

77‧‧‧Support wheel

78‧‧‧Apartment

80‧‧‧Second drive

81‧‧‧ shaft

82‧‧‧ Gears

83‧‧‧Roller

84‧‧‧Motor

85‧‧‧ Gearbox

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a preferred embodiment of the present invention (some components are omitted or shown in phantom lines, Figure 2 is the same) with the footrest unit in an initial use position.

2 is a perspective view of a preferred embodiment of the present invention with the footrest unit in a stowed position.

Figure 3 is a perspective view of a preferred embodiment of the present invention after removal of the footrest unit (some components are omitted or shown in phantom lines).

4 is a rear perspective view of the footrest unit in accordance with a preferred embodiment of the present invention.

Figure 5 is a left side view of the preferred embodiment of the present invention after removal of the footrest unit (some components are omitted or shown by imaginary lines, the same below).

Figure 6 is a left side elevational view of a preferred embodiment of the present invention with the footrest unit positioned in the stowed position.

Figure 7 is a left side view of a preferred embodiment of the present invention with the footrest unit in a transitional position Set.

Figure 8 is a left side elevational view of a preferred embodiment of the present invention with the footrest unit positioned in the initial use position.

Figure 9 is a left side elevational view of a preferred embodiment of the present invention with the footrest unit in an intermediate use position.

Figure 10 is a left side elevational view of a preferred embodiment of the present invention with the footrest unit in an extreme use position.

Referring to FIG. 1 and FIG. 2, a power chair (10) according to a preferred embodiment of the present invention is specifically an electric massage chair, which can massage a user riding thereon, mainly including a support on the ground. a base (20), a seat unit (30) (illustrated by an imaginary line) provided on the base (20), and a seat back unit (40) disposed behind the seat unit (30) (some components are omitted Displayed, two hand rest units (60) respectively disposed on the left and right sides of the seat unit (30), and used in front of the seat unit (40) when used, and can be stored in the seat unit when not in use (40) ) A footrest unit (70) below.

Referring to FIG. 3, the base (20) is frame-shaped and is basically welded by a plurality of metal rods, and can be stably supported on a support surface such as a floor or a floor. (Note: When the electric chair of the present invention is applied In large vehicles such as buses, trains or airplanes, the aforementioned pedestal may be fixed to the passenger compartment floor of the aforementioned vehicle). The base (20) has a symmetrical one left portion (21) and a right side portion (22), and a storage space (23) is formed between the left side portion (21) and the right side portion (22), and the front end of the storage space (23) A rectangular opening is formed.

The seat unit (30) covers the storage space (23) of the base (20) and has a buttock support for supporting the buttocks (and the thighs) of the user. The seat back unit (40) is disposed at the rear of the seat unit (30) and has a back support portion for supporting the back of the user. The two hand rest units (60) are respectively disposed on the left and right sides of the seat unit (30), and the lower half covers the outer side surfaces of the left side portion (21) and the right side portion (22) of the base (20), respectively. Each of the tops is provided with an arm support portion (61) for supporting the user's arm. In practice, the electric chair (10) (electric massage chair) is provided on the back, buttocks/thighs and the small part of the backrest unit (40), the seat unit (30) and the hand rest unit (60), respectively. The massage device for the massage of the arm (not shown), but since the massage device and its function are not substantially related to the creative focus of the present invention, it will not be disclosed or illustrated in the present case.

In this embodiment, the seat unit (30) is positioned on the base (20) while the seat back The unit (40) and the hand rest unit (60) are constrained to be displaced relative to the base (20), and the seat back unit (40) and the hand rest unit (60) are relatively moved relative to each other, in particular, The seat back unit (40) is deflectable between an upright position as shown in Fig. 8 and a lying down position as shown in Fig. 10, and also causes a corresponding displacement of the hand rest unit (60) while being deflected. A first driving device (50) for driving the deflection of the seat back unit (40) is disposed between the seat back unit (40) and the base (20) (refer to FIG. 3, FIG. 5), and the embodiment adopts a motor. a linear actuator (conventional device) composed of a screw, a solenoid, or the like, which is mounted in the housing space (23) of the base (20) and located at a center-left position on the left and right widths (see image 3). The connection mechanism between the seat back unit (40), the hand rest unit (60) and the base (20) is also not the creative focus of the present invention, and the description is omitted here (Note: if necessary, refer to another applicant's Patent Application (Application No. 103135320) "Related structure in the preferred embodiment disclosed in the electric chair having the reclining function". The electric chair of the present invention may not have the aforementioned hand rest unit.

Referring to FIG. 3 and FIG. 5, the inner side surfaces of the left side portion (21) and the right side portion (22) of the base (20) are respectively provided with a curved extending groove-shaped guide rail (24) (Note: FIG. 3 and FIG. 5) Only the left side structure of the base (20) is completely displayed, and the right side structure omitted from the display corresponds to the left side), and the left and right two guide rails (24) are respectively located in the front and rear axial directions (X axis) and the upper and lower axial directions (Y). Each of the guide rails (24) has a continuous first section (241), a second section (242) and a third section (243), wherein the first section (241) corresponding position is at the bottom of the storage space (23), and a corresponding position extends horizontally forward at a first position at the rear end of the storage space (23) to a second position corresponding to the front end of the storage space (23). The second section (242) extends upward from the second position to a third position, and the third section (243) extends from the third position to a fourth position that is later than the third position. In this embodiment, the third section (243) exhibits a semicircular shape with a concave arc facing downward, that is, the third section (243) is curved upwardly from the third position to the rear. Then go to the arc While extending downward.

The inner side surfaces of the left side portion (21) and the right side portion (22) of the base (20) are also respectively provided with a curved extending rack (25) (note: it is practically possible to join two or three segments into one of the aforementioned racks) The respective racks (25) extend completely along the second section (242) and the third section (243) of the corresponding rail (24) and are positioned by the bottom end of the corresponding second section (242) (also The position of the front end of the first section (241), that is, the aforementioned second position) extends horizontally rearward, but extends only backward to a predetermined position corresponding to the intermediate portion of the first section (241), without extension To the second half of the first section (241). The teeth of the rack (25) are arranged along the guide rail (24) on the predetermined side of the guide rail (24), and in the horizontal first section (241) of the guide rail (24), the teeth of the rack (25) The tooth is located at the bottom of the first section (241). In addition, each rail (24) The inner bottom surface of the first section (241) defines a roller support surface (not labeled) that extends horizontally along the first section (241).

The inner side surfaces of the left side portion (21) and the right side portion (22) of the base (20) are further provided with a supporting portion (26), and each supporting portion (26) is correspondingly located at the front end of the storage space (23). In detail, it is located in front of the second section (242) of the corresponding rail (24) and below the top end of the second section (242) (i.e., the aforementioned third position). In this embodiment, the support portion (26) is substantially a roller-shaped member pivotally disposed on the base (20) in the left-right direction, from the left side portion (21) or the right side portion of the base (20) (22) ) Protruding to the inside in the proper length.

Referring to Figures 1, 2 and 4, the footrest unit (70) has a left side portion (71), a right side portion (72), and a septum between the left side portion (71) and the right side portion (72). a portion (73), and a back surface (75) and a bottom surface (76) which are connected in an L shape; a cavity for accommodating the left foot of the user is formed between the left side portion (71) and the middle partition portion (73) (74), another recess (74) is formed between the right side portion (72) and the middle partition portion (73) for accommodating the right foot of the user, and the accommodation space of each of the pockets (74) is generally viewed from the side view The L-shape has a calf support portion for supporting the lower leg of the user and a sole support portion (none of which is not shown) for supporting the sole of the user, the back surface (75) facing away from the calf support portion, the bottom surface (76) ) facing away from the aforementioned sole support portion. Two left and right ground wheels (77) are pivotally disposed at the boundary between the back surface (75) and the bottom surface (76), and the pivot of the ground wheel (77) corresponds to the left and right axial directions. The footrest unit (70) is internally provided with a massage device for massaging the user's lower leg and the foot/foot. Similarly, since the massage device and its function are not substantially related to the creative focus of the present invention, in this case, No disclosure or explanation.

A position corresponding to the left and right axial direction (Z axis) of the footrest unit (70) corresponding to the top end of the calf support portion is pivoted (81), and the left and right ends of the rotation shaft (81) protrude from the footrest unit (70) The left and right sides, and the two ends are coaxially fixed with a gear (82) and a roller (83) outside the gear (82). A portion of the footrest unit (70) corresponding to the left and right ends of the rotating shaft (81) (that is, a portion where the gear (82) and the roller (83) are disposed) respectively form a leading portion, and the left side of the footrest unit (70) The right second lead portion is respectively fitted on the left and right two guide rails (24) of the base (20), and can move along the guide rail (24); specifically, each gear (82) and the roller (83) can follow along The corresponding side rails (24) roll, and the gear (82) is engaged with the rack (25) in the section having the aforementioned rack (25), and the roller (83) is in the section having the aforementioned roller supporting surface (also That is, the first section (241) can roll on the aforementioned roller support surface.

A second driving device (80) is disposed at the center of the top end of the footrest unit (70), and mainly includes a motor (84) and a gear box (85). The tooth transmission box (85) is provided with a motor power reducing speed ( increase Torque), worm-worm gear set and spur gear set (not shown) that change direction and transmit to the shaft (81). The control motor (80) can drive the aforementioned rotating shaft (81), the gear (82) and the roller (83) to rotate synchronously in the first rotation direction or in the opposite second rotation direction by the forward rotation or the reverse rotation, by the gear (82) And/or the friction between the roller (83) and the aforementioned rack (25) and/or the roller supporting surface on the side of the rail (24), so that the aforementioned leading portion of the footrest unit (70) can follow the guide rail (24) Moving from the direction of the first position to the direction of the fourth position, or vice versa, from the direction of the fourth position to the direction of the first position.

The left and right sides of the footrest unit (70) are respectively provided with an abutting portion (78), and the abutting portion (78) is located adjacent to the top end of the calf support portion, and is more biased than the two leading portions. The bottom end of the aforementioned calf support portion. In this embodiment, the abutting portion (78) is substantially an elongated metal plate protruding from the left and right sides of the footrest unit (70) and including the long axial direction along the lower leg supporting portion. An extended main portion and an end portion bent by a tip end of the aforementioned main portion.

When the aforementioned leading portion of the footrest unit (70) (hereinafter referred to as the gear 82) is located at the rear end of the first section (241) of the guide rail (24) (that is, the aforementioned first position), as shown in FIG. 6 and 2, the footrest unit (70) is correspondingly located at a storage position. In this state, most of the footrest unit (70) is located in the storage space (23) of the base (20), and the back surface (75) Directly downward, the aforementioned bottom surface (76) faces forward and closes the aforementioned opening of the accommodation space (23). When the leading portion (82) of the footrest unit (70) is located at the bottom end of the first section (241) of the guide rail (24) / the bottom end of the second section (242) (ie, the aforementioned second position), As shown in FIG. 7, the footrest unit (70) is correspondingly located at a transition position. In this state, most of the footrest unit (70) is located in front of the base (20), and the back surface (75) faces downward. The bottom surface (76) faces forward, and the ground support wheel (77) is supported on the support surface (floor/floor). When the leading portion (82) of the footrest unit (70) is located at the top end of the second section (242) of the guide rail (24) (ie, the aforementioned third position), as shown in FIG. 8 and FIG. The unit (70) is correspondingly located at an initial use position. In this state, most of the footrest unit (70) is located in front of the base (20), and the top end of the aforementioned leg support portion is adjacent to the front end of the seat unit (30). The ground support wheel (77) is supported on the support surface, and a first angle (about 46 degrees in this example) is formed between the back surface (75) and the support surface. When the leading portion (82) of the footrest unit (70) is located at the rear end of the third section (243) of the guide rail (24) (that is, the aforementioned fourth position), as shown in FIG. 10, the footrest unit ( 70) the corresponding position is in an extreme use position, in which the footrest unit (70) is mostly in front of the base (20), and the top end of the aforementioned leg support portion is adjacent to the front end of the seat unit (30), The two abutting portions (78) are respectively supported by the two supporting portions (26) of the base (20), so that the footrest unit (70) floats away from the supporting surface, and between the back surface (75) and the supporting surface Forming a smaller angle than the first angle The second angle (this example is about 18 degrees).

Referring again to Figure 8, when the leader (82) of the footrest unit (70) is raised from the lower portion of the second section (242) of the rail (24) to the top of the second section (242) (i.e., the foregoing In the third position), the abutting portion (78) of the footrest unit (70) is in contact with the support portion (26) of the base (20). After the leading portion (82) of the footrest unit (70) enters the third section (243) by the second section (242) of the rail (24), because the top end of the footrest unit (70) is led by the leading portion (82) ) is driven upwards and the support portion (26) of the base (20) is held under the abutment portion (78) of the footrest unit (70), so the ground support wheel at the bottom end of the footrest unit (70) (77) will float away from the aforementioned support surface, and cause the bottom end of the lower leg support portion to gradually rise relative to the top end, for example, as shown in FIG. 9, the leading portion (82) of the footrest unit (70) is located on the guide rail (24). The state of the three-section (243) central position, at this time, the footrest unit (70) corresponds to an intermediate use position, and the angle between the back surface (75) and the support surface (about 39 degrees in this example) It is smaller than the aforementioned first angle and larger than the aforementioned second angle.

According to the above-mentioned technology of the present invention, the user of the electric chair (10) can control the footrest unit through a controller (not shown) electrically connected to the motor (84) of the second driving device (80). 70) retracting under the seat unit (30) to present the storage state, or extending the front of the seat unit (30) to assume the use state, and controlling the support angle of the footrest unit (70) in the use state (ie, The angle between the calf support and the sole support). That is, when no one uses the electric chair (10) or does not need to use the footrest unit (70), the second driving device (80) can be commanded to drive the displacement of the leading portion (82) of the footrest unit (70) through the aforementioned controller. The first position to the guide rail (24) is as shown in FIG. 2 and FIG. 6; when the footrest unit (70) is required, the second driving device (80) is commanded to drive the leading portion of the footrest unit (70) ( 82) by the first position of the guide rail (24) through the second position to the third position, as shown in Figures 1 and 8; if the bottom end of the footrest unit (70) is raised upward to have a flatter The support angle commands the second driving device (80) to drive the leading portion (82) of the footrest unit (70) to the appropriate position in the third section (243) of the guide rail (24), including but not limited to the figure. The position shown in Figure 9 and the position shown in Figure 10 cause the footrest unit (70) to assume a corresponding support angle. In this embodiment, during the movement of the leading portion (82) of the footrest unit (70) from the third position to the fourth position, the bottom end of the calf support portion continues to rise relative to the top end, and the angle is continuously reduced. Conversely, during the movement of the leading portion from the fourth position to the third position, the bottom end of the lower leg support portion continues to descend relative to the top end, and the aforementioned angle continues to expand. In this embodiment, the range of the support angle variation of the footrest unit (70) in the use state (that is, the difference between the first angle and the second angle) is about 28 degrees. By changing the aforementioned fourth position of the guide rail, the aforementioned angle The range of variation may be larger or smaller. For example, please refer to Figure 10. If the leading portion (82) of the footrest unit (70) continues downward from the position shown in the figure, the angle will continue to shrink. That is, the calf support will be closer to the level.

Based on the ergonomics of the seat and the reclining chair, in the preset control mode of the aforementioned electric chair (10) (electric massage chair), when the user commands the backrest unit (40) to be tilted from the standing position shown in FIG. 8 to FIG. 10 In the lying position, the control circuit not only controls the first driving device (50) to drive the backrest unit (40) to tilt, but also controls the second driving device (80) to cooperate, and the footrest unit (70) is correspondingly The ground is driven by the aforementioned initial use position (the most oblique support angle) to the aforementioned extreme use position (the support angle is the flattest), and conversely, when the backrest unit (40) is driven from the lying position to the standing position, the footrest unit (70) is also It is automatically driven from the extreme use position to the initial use position. Of course, the user can also independently adjust the footrest unit (70) to a possible support angle according to individual needs when the backrest unit (40) is stopped at any angle.

In the above disclosed embodiment, the second half of the first section (241) of each rail (24) (or at least one third of the length from the rear end) defines a safety section (244), the aforementioned rack ( 25) does not extend to the aforementioned safety section (244); when the aforementioned leading portion of the footrest unit (70) is in the safety section (244) and the aforementioned rotating shaft (81) is driven by the second driving device (80), The footrest unit (70) is subjected to a certain degree of undesired resistance, and the gear (82) and the roller (83) will idle in place, otherwise the gear (82) and the roller (83) will roll along the guide rail (24). Thereby, when the second driving device (80) drives the footrest unit (70) to be displaced from the use position to the storage position, when about half of the footrest unit (70) has been retracted into the storage space (23) of the base (20) The other half is still in front of the base (20), if the user's foot still does not pull out the pocket (74) of the footrest unit (70), or the footrest unit (70) and the base (70) ) If any body parts or clothing or debris are caught between them, the footrest unit (70) will stop retracting into the base (20) until the resistance is removed, thus avoiding pinching the human body, etc. The accident.

In summary, the electric chair provided by the present invention can electrically drive the footrest unit to be retracted under the seat to present the storage state or protrude from the front of the seat for use, and can control the support under the use state. Angle to match the user's needs. Moreover, the structure of the present invention is simpler and the manufacturing cost is lower than that of the conventional electric chair that can achieve the same function. Furthermore, the electric chair of the present invention can effectively avoid accidents such as pinching the human body during the process of driving the footrest unit to be retracted under the seat from the front of the seat.

10‧‧‧Electric chair

20‧‧‧ Pedestal

24‧‧‧rail

242‧‧‧Second section

243‧‧‧ third section

26‧‧‧Support

70‧‧‧foot unit

75‧‧‧Back

76‧‧‧ bottom

77‧‧‧Support wheel

78‧‧‧Apartment

82‧‧‧ Gears

Claims (9)

An electric chair includes a base for positioning on a support surface, a left side portion and a right side portion, and a storage space formed between the left side portion and the right side portion, the front end of the storage space having a front end An opening; each of the left side portion and the right side portion is provided with a rail, each of the rails extending from a first position to a second position and then extending to a third position and then extending to a fourth position, each of the guide rails having a continuous one a first section, a second section and a third section, wherein the first section corresponds to a bottom of the storage space, and the corresponding position extends forward to a corresponding position at the first position of the rear end of the storage space In the second position of the front end of the storage space, the second section extends upward from the second position to the third position, and the third section extends from the third position to be compared to the third position In the fourth position at the rear, the left side portion and the right side portion are further provided with a support portion; a seat unit is disposed above the storage space of the base, and has a support a hip support portion of the user's buttocks; a seat back unit disposed at the rear of the seat unit and having a back support portion for supporting the back of the user; and a footrest unit having a lower leg for supporting the user's lower leg a support portion, a sole support portion for supporting the sole of the user, a back surface facing the calf support portion, a bottom surface facing away from the sole support portion, and at least one branch disposed near the boundary between the back surface and the bottom surface a wheel, two leading portions on the left and right sides, and two abutting portions respectively located on the left and right sides; the two leading portions are respectively adjacent to the top end of the calf support portion, and are respectively matched with the base The two rails of the seat are movable along the rail; the footrest unit can enter and exit the storage space via the opening of the base; a driving device for driving the leading portion of the footrest unit along the foregoing The foregoing rail movement of the base; wherein, when the leading portion is in the first position of the guide rail, the footrest unit is mostly in the storage space The back surface faces downward, the bottom surface faces forward; when the leading portion is at the second position of the rail, the footrest unit is mostly in front of the base, the back surface faces downward, and the bottom surface faces forward, the branch wheel Supporting on the support surface; when the leading portion is in the third position of the guide rail, the footrest unit is mostly in front of the base, and the top end of the lower leg support portion is adjacent to the front end of the seat unit, The ground support wheel is supported on the support surface, and a first angle is formed between the back surface and the support surface; when the leading portion is in the fourth position of the guide rail, the footrest unit is mostly in front of the base The top end of the calf support portion is adjacent to the front end of the seat unit, and the two abutting portions are respectively supported by the two support portions of the base, so that the footrest unit floats away from the support surface, the back surface and the foregoing A second angle is formed between the support surfaces that is smaller than the first angle. The electric chair according to claim 1, wherein in the process of moving the aforementioned leading portion of the footrest unit from the third position to the fourth position of the guide rail, the bottom end of the calf support portion continuously rises relative to the top end. The electric chair according to claim 1, wherein each of the supporting portions of the base corresponds to a front end of the storage space and is lower than a third position of the guide rail; and the two abutting portions of the footrest unit are adjacent to each other The second abutting portion is located closer to the bottom end of the calf support portion than the second leading portion at a position of the top end of the calf support portion. In the electric chair of claim 3, the third section of each of the guide rails of the base extends upward from the third position to the rear, and then extends downward at the same time. The electric chair of claim 1, wherein each of the left side portion and the right side portion of the base is provided with a rack, and each of the racks extends along at least a second section and a third section of the corresponding rail; The foot unit is provided with a rotating shaft corresponding to the left and right axial directions, and the left and right ends of the rotating shaft are coaxially fixed with a gear, and each of the gears can be rolled along the aforementioned guide rail of the corresponding side, and in the section having the foregoing rack Engaging with the rack; the two portions of the footrest unit corresponding to the left and right ends of the rotating shaft form the two leading portions; the driving device includes a motor disposed on the footrest unit for driving the rotating shaft. The electric chair of claim 5, wherein the first section of each of the aforementioned rails defines a safety section by at least one third of a length from the rear end, and the rack does not extend to the aforementioned safety section; When the aforementioned leading portion of the unit is in the aforementioned safety section and the aforementioned rotating shaft is driven by the motor, if the footrest unit is subjected to a certain degree of undesired resistance, the gear may idling in place, otherwise the gear may roll along the aforementioned guide rail. . The electric chair of claim 6, wherein at least the aforementioned safety zone of the first section of each of the aforementioned guide rails A roller supporting surface extending along the first section is disposed beside the segment; the left and right ends of the rotating shaft on the footrest unit are also coaxially fixed with a roller, and the roller can roll on the roller supporting surface. The electric chair according to claim 1, wherein when the leading portion of the footrest unit is at the first position of the guide rail, the bottom surface of the footrest unit closes the opening of the storage space. An electric chair includes a base for positioning on a support surface, a left side portion and a right side portion, and a storage space formed between the left side portion and the right side portion, the front end of the storage space having a front end An opening; each of the left side portion and the right side portion is provided with a guide rail, each of the guide rails has a continuous first section, a second section and a third section, wherein the first section corresponds to the storage space a bottom portion extending forwardly from a position corresponding to a rear end of the storage space to a position corresponding to a front end of the storage space, wherein the second section extends upward from a front end of the first section, the third section Extending from a top end of the second section to a position closer to a rear end than the front end of the second section; the left side portion and the right side portion are further provided with a supporting portion, wherein the supporting portion is corresponding to a front end of the storage space and lower than a top end of the second section of the guide rail; a seat unit disposed above the storage space of the base and having a hip for supporting a user's buttocks a backrest unit, disposed at the rear of the seat unit, having a back support portion for supporting the back of the user; a footrest unit having a lower leg support portion for supporting the user's lower leg, a sole support portion supporting the sole of the user, a back surface facing the calf support portion, a bottom surface facing away from the foot support portion, and at least one support wheel disposed near the boundary between the back surface and the bottom surface, respectively Two leading portions on the left and right sides and two abutting portions respectively located on the left and right sides; the two leading portions and the two abutting portions are all located adjacent to the top end of the calf support portion, and the foregoing The second abutting portion is opposite to the bottom end of the calf support portion than the two leading portions; the two leading portions are respectively fitted on the two guide rails of the base, and can move along the guide rail; when the leading portion is on the guide rail In the third section, the two abutting portions are respectively supported by the two supporting portions of the base, so that the footrest unit floats away from the supporting surface; a driving device for driving the aforementioned leading portion of the footrest unit to move along the aforementioned guide rail of the base.