CN110809460B - Stand-up assist device and wheelchair having the same - Google Patents

Abstract

The invention provides a standing assist device and a wheelchair having the same, which can safely assist a user in a standing action and a sitting action without sliding off a seat. The standing-up assistance device (10) includes: a main body frame (16) detachably mounted on the seat surface frame (14) via engaging sections (34, 48); a seat section (18) that is provided on the main body frame (16), and that connects the front seat section (60) and the rear seat section (62) by a hinge (22), wherein the front end section of the front seat section (60) is vertically rotatably supported by the front end section of the main body frame (16); a seat moving mechanism (20) for applying a rotating force to the center of the lower surface of the rear seat (62) to vertically rotate the seat (18) and move the seat (18) between the sitting position and the standing position; a reverse buckling prevention member (24) that prevents the seat (18) from buckling reversely; and a rear seat forward-tilt adjusting device (26) for adjusting the forward tilt angle of the rear seat (62) when the seat (18) is rotated from the seating position to the standing position.

Description

Stand-up assist device and wheelchair having the same

Technical Field

The present invention relates to a standing assist device and a wheelchair having the standing assist device mounted thereon, and more particularly to a standing assist device for safely assisting a sitting operation and a standing operation of a user using a wheelchair in the wheelchair, and a wheelchair having the standing assist device mounted thereon.

Background

In the case where an elderly person, a disabled person, or the like cannot support a stooped posture by leg and foot force when standing up from a wheelchair or sitting down, it is necessary to stand up or sit down while supporting the body weight of the person with the assistance of a caregiver.

In order to assist such elderly persons, handicapped persons, and the like, for example, patent document 1 proposes a folding wheelchair having a seat for assisting a user in standing up and sitting down. In patent document 1, the seat is in a substantially horizontal seating state in a state where the load on the seat is greater than the urging force of the elastic member, and is in an upright state in which the right and left rear seat portions are lifted by the urging force of the elastic member and the right and left front seat portions are tilted forward in a state where the load on the seat is less than the urging force of the elastic member.

Patent document 2 proposes a standing assistance device for a foldable wheelchair, in which a cloth or the like is covered on armrest portions and a seat bottom portion on both sides of the foldable wheelchair, frame portions are attached to both sides of the seat bottom portion of the cloth or the like, and the frame portions are raised and lowered by tightening a rope such as a rope with a driving portion attached to a back portion of the wheelchair.

Documents of the prior art

Patent document 1: japanese patent No. 4612117

Patent document 2: japanese laid-open patent publication No. 2008-237470

However, the folding wheelchair described in patent document 1 can safely assist the user in standing up and sitting down, but requires a dedicated wheelchair for mounting the seat.

On the other hand, the standing assist device for a folding wheelchair described in patent document 2 can be attached to a general-purpose wheelchair, but structurally, the seat portion is tilted forward and raised as a whole. Therefore, the body of the user may slide along the surface of the seat portion or be thrown forward like a slide, and the user is not sufficient as a standing assistance device.

Disclosure of Invention

In view of the above-described problems, an object of the present invention is to provide a standing assist device that can be easily attached to and detached from a seat frame from which a seat cushion of a wheelchair is detached, and that can safely assist a standing operation and a sitting operation without a user slipping off from the seat.

In order to achieve the above object, an uprising assistance device according to the present invention is detachably attached to a seat frame of a wheelchair from which a seat cushion is removed, the uprising assistance device including: a body frame detachably mounted on the seat cushion frame, and having a front side frame and a rear side frame arranged in parallel and connected by a connection frame; a seat section provided on the main body frame, having a front seat section disposed on the front side frame side and a rear seat section disposed on the rear side frame side, the front seat section and the rear seat section being connected by a hinge, and a front end section of the front seat section being supported at a front end section of the main body frame so as to be vertically rotatable; a seat moving mechanism having one end rotatably connected to the connecting frame and the other end rotatably connected to the center of the lower surface of the rear seat, and configured to move the seat between a sitting position parallel to the main body frame and a standing position tilted forward with respect to the main body frame by applying a rotating force to the center of the lower surface of the rear seat to vertically rotate the seat; a reverse buckling prevention member suspended between the front seat part and the rear seat part to prevent the seat part from reversely buckling downward at the position of the hinge; and a rear seat forward-tilting adjustment device having one end rotatably supported by the connecting frame and the other end rotatably supported on a rear end side of the center of the lower surface of the rear seat, wherein when the seat is rotated from the seating position to the standing position, a resistance force against an upward rotational force of the seat is applied to the rear end side of the rear seat.

According to the present invention, the seat section in which the front seat section and the rear seat section are connected by the hinge is provided in the body frame mounted on the seat frame of the wheelchair, and the front end section of the seat section is vertically rotatably supported by the front end section of the body frame. One end of the seat moving mechanism is rotatably connected to a connecting frame which is a component of the main body frame, and the other end is rotatably connected to the center of the lower surface of the rear seat, and the seat is rotated up and down by applying a rotational force to the center of the lower surface of the rear seat.

According to the above configuration, the rise assist device includes all of the drive mechanisms of the seat section, the seat section moving mechanism, the reverse buckling prevention member, and the rear seat section forward tilting adjustment device, which are mounted on the main body frame (including the connection frame) that is mounted on the seat frame of the wheelchair.

Thus, the standing assist device according to the present invention is configured as a device in which all the drive mechanisms are completely independent from the wheelchair, and is configured to be attachable only by mounting the body frame of the standing assist device on the seat frame of the wheelchair. Therefore, since the standing assistance device does not need to be installed in a dedicated wheelchair, the standing assistance device can be easily installed in various wheelchairs and used.

Further, the rotational force of the seat moving mechanism is applied to the center of the lower surface of the rear seat. Therefore, since the force is applied to the central portion of the hip portion of the seated user (the position of the center of gravity of the seated user), the rear seat portion can be lifted more stably and the seat portion can be moved between the seating position and the standing position, as compared with the case where the rotational force is applied to the other portion of the seat portion. Further, even if the seat section is configured to hinge the front seat section and the rear seat section by a hinge, the sense of incongruity of the user can be reduced.

Further, the seat portion itself can be made less rigid than when a rotational force is applied to other portions of the seat portion, and therefore the seat portion and hence the rise assist device can be made lighter in weight. This also facilitates the transportation of the standing assist device.

Further, since the reverse buckling prevention member that prevents the seat section from reversely buckling downward at the position of the hinge is provided, the seat section does not reversely buckle even if the weight of the user is applied to the position of the hinge when the user sits on the seat section, or when the user sits down to or leaves the seat section. Therefore, the user can be assisted in safe standing up and sitting down.

The reverse buckling prevention member may be configured to suspend the rod-like member between the front seat section and the rear seat section directly below the hinge, for example. Here, the suspension of the rod-shaped member between the front seat section and the rear seat section means that both ends of the rod-shaped member are not fixed to the front seat section and the rear seat section and become free ends. Thus, the reverse buckling prevention member does not interfere with the forward buckling operation of the seat at the hinge position when the seat moves to the standing position, and can prevent the seat from buckling reversely.

Further, when the seat section is rotated from the seating position to the standing position by providing the rear seat section forward tilting adjustment device, resistance against an upward rotating force of the seat section is given to the rear end side of the rear seat section. Thereby, the rear seat section is rotated in a downward direction opposite to the upward direction of the seat section with the hinge as a rotation center. Therefore, in the standing position of the seat section, the front seat section and the rear seat section can be made different in the forward inclination angle. Specifically, the front seat portion with which the back surfaces of the thighs are in contact has a large forward inclination angle so that the user can easily stand up, and the rear seat portion with which the buttocks are in contact has a smaller forward inclination angle than the front seat portion, so that the user can hardly slip off the seat portion. This can assist the user in a safe standing action and sitting action.

In another aspect of the standing assistance device according to the present invention, it is preferable that the front side frame and the rear side frame have a frame width adjustment device for adjusting the width of the main body frame.

The width of the seating surface of the wheelchair varies depending on the size, the middle size, the large size, and the like, and the width of the seating surface of the foreign wheelchair is larger than that of the japanese wheelchair. However, as in the above-described configuration, by providing the frame width adjusting devices for adjusting the width of the main body frame on the front side frame and the rear side frame, it is possible to easily attach the wheelchair to different seat surface widths without causing mounting looseness.

In another aspect of the standing assistance device according to the present invention, the front side frame and the rear side frame preferably have engaging members that engage with a seat frame of a wheelchair.

The main body frame of the rise assist device can be mounted on the seat frame of the wheelchair in an engaged state by the engaging member, and can be further mounted without mounting looseness.

As another aspect of the standing assistance device of the present invention, it is preferable that the rear seat forward tilt adjusting device is configured by: a first shaft support part fixed to an upper surface of the connection frame on a side close to the front side frame; a second shaft support part fixed to a lower surface of the rear seat part on the rear end side of the center of the lower surface; and a guide rod formed in a rod shape, one end of which is pivotally supported by the first shaft support portion and the other end of which is pivotally supported by the second shaft support portion, and configured to form a four-link structure in which the front seat portion, the rear seat portion, a connecting frame portion from a vertical rotation center of the seat portion to the first shaft support portion, and the guide rod are four-jointed.

These show preferred specific examples of the recoil adjuster. With this four-bar linkage structure, when the seat section is rotated from the seating position to the standing position, resistance against the upward rotational force of the seat section is applied to the rear end side of the rear seat section, so the forward inclination angle of the rear seat section is smaller than the forward inclination angle of the front seat section. Therefore, the user does not slip off the seat when the user stands up, and the standing up operation can be safely assisted.

As another aspect of the standing-up assist device of the present invention, the seat moving mechanism includes: a link member including a first link having one end rotatably connected to a center of a lower surface of the rear seat portion and a second link having one end rotatably connected to the other end of the first link and the other end connected to the connecting frame; a holding member having one end rotatably connected to a rear end side position of the connecting frame and the other end extending downward of the main body frame; a gas spring, one end of which is rotatably connected to the other end of the holding member, and the other end of which is rotatably connected to the link member; and a lock mechanism that restricts movement of the link member by the gas spring, wherein the seat section is configured to be movable from the seating position to the standing position by an urging force of the gas spring via the link member in a state where the lock mechanism is released.

According to the aspect of the present invention, the seat portion is moved from the seating position parallel to the main body frame to the standing position tilted forward with respect to the main body frame by the urging force of the gas spring via the link member. Thereby, an upward rotational force is applied to the seat portion by the biasing force of the gas spring, and a downward rotational force is applied to the seat portion by the load of the user.

Thus, a power source or the like as a driving source for moving the seat portion from the seating position to the standing position is not required, and the standing assist device can be reduced in weight. Therefore, the standing assist device is easily carried.

Further, in the case where the rotational force is directly given to the backseat portion by the gas spring, it is necessary to determine the installation position of the gas spring in cooperation with the position of the backseat portion. However, according to the above configuration, since the direction of the biasing force of the gas spring can be changed by the link member, the degree of freedom in design regarding the installation position of the gas spring can be increased.

For example, the position of the gas spring is designed sufficiently considering the case where the structure below the seat surface of the wheelchair must be avoided. For example, when the standing assist device is attached to a foldable wheelchair, a cross link crossing in an X-shape in front view is disposed under the seat surface, and therefore the gas spring needs to be located at a position where it does not interfere with the cross link.

Therefore, it is important to improve the flexibility of design for the arrangement of the gas spring in order to improve the versatility of the standing assist device.

As another aspect of the standing assist device of the present invention, it is preferable that a protrusion portion that abuts against the rear seat portion when the seat portion moves from the standing position to the seating position is provided at the other end of the first link.

The seat receives a load by, for example, a user sitting thereon, and moves from the standing position to the sitting position. At this time, the gas spring is compressed by the load. Since the gas spring increases the acting force as it is compressed, the link member receives a stronger acting force as the seat portion moves to the seating position.

However, as described above, the other end of the first link is provided with a projection portion that comes into contact with the rear seat portion when the seat portion moves from the standing position to the seating position due to a load. Thus, a strong urging force applied to the link member when the seat section is moved to the seating position can be transmitted not only to one end of the first link but also to the seat section via the protrusion portion at the other end of the first link.

That is, a strong urging force applied to the link member when the seat section moves to the seating position can be dispersed. Therefore, the rigidity required for the link member can be reduced, and therefore the weight of the link member and hence the rise assist device can be reduced. And therefore, is also easy to transport.

Another aspect of the standing-up assistance device according to the present invention is configured as follows: the lock mechanism includes a hook rotatably provided on the rear side frame to restrict movement of the link member by an urging force of the gas spring, and the hook rotates and engages with the link member when the seat section moves from the standing position to the seating position.

In the above-described configuration, the hook is engaged with the link member when the seat section is moved from the standing position to the seating position by a load of seating of the user. Since the hook restricts the movement of the link member by the biasing force of the gas spring, the movement of the link member is restricted in a state where the hook is engaged, and the seat section does not move from the seating position to the standing position. In other words, the hook functions as a locking mechanism for the movement of the seat portion to the standing position.

The hook engaged with the link member can be directly rotated to release the engagement with the link member in a state where a load is applied to the rear seat section such as when a user sits down. However, in a state where no load is applied to the seat portion, the hook engaged with the link member is strongly urged by the gas spring, and therefore, it is difficult to rotate and release the engagement with the link member. Therefore, in a state where no load is applied to the seat section, the seat section can be prevented from moving to the standing position by accidentally releasing the engagement between the link member and the hook.

In addition, as described above, the hook functions as the lock mechanism, but from the viewpoint of safety, it is preferable that the lock mechanism is operated by a caregiver rather than the user who sits on the seat himself. In this respect, according to the above-described structure, the hook is provided on the rear side frame, on the back side of the user in the state where the user is seated, and therefore, the user cannot easily operate. Therefore, the user can be inhibited from accidentally releasing the lock mechanism.

As another aspect of the standing assistance device of the present invention, it is preferable that the holding member is rotatable together with the gas spring from a position perpendicular to the connecting frame to a parallel housing position when the seat portion is at the seating position.

As a further preferable aspect of the holding member, it is more preferable that one end of the holding member is rotatably connected to a position on the rear side of the connecting frame, and when the seat portion is at the seating position, the holding member is rotatable together with the gas spring from a position perpendicular to the connecting frame to a parallel housing position.

According to the above configuration, the holding member can be rotated together with the gas spring to a position parallel to the coupling frame in a state where the seat portion is at the seating position. Therefore, the standing assist device can be compactly folded, and thus, the standing assist device can be more easily transported.

As another aspect of the standing assist device of the present invention, it is preferable that a rotation restricting portion that abuts against the hook when the holding member is rotated to the storage position to restrict rotation of the hook is provided at one end of the holding member.

If the holding member is rotated to the storage position, the gas spring is also moved together to a position parallel to the coupling frame, but the biasing force of the gas spring is not applied to or weakened by the link member, and the hook may be freely rotated to release the locking mechanism of the hook.

Therefore, with the above configuration, the rotation restricting portion provided at the one end of the holding member rotates to the storage position and abuts against the hook to restrict the rotation of the hook, and therefore such a situation can be prevented.

As another aspect of the standing assistance device of the present invention, it is preferable that one end of the holding member is fixed and connected to a position on the front side of the connecting frame.

These show an example of a modification of the holding member.

One end of the holding member is fixed to the connecting frame, and the other end extends downward of the connecting frame and is connected to the gas spring. The gas spring needs to be attached to the center of the lower surface of the rear seat portion as described above.

However, according to the holding member of the above configuration, since the holding member is fixed at the position on the front side of the coupling frame, the length (distance from one end to the other end) of the holding member can be made shorter than in the case where the holding member is fixed at the position on the rear side of the coupling frame.

Further, since the holding member is fixed, the standing assist apparatus can be made simple in structure and easier to handle than a case where the holding member is movable.

As a further preferable aspect of the above-described holding member, it is preferable that a position adjusting portion that adjusts a connection position with one end of the gas spring is provided at the other end of the holding member.

According to the above configuration, the angle between the gas spring and the backseat in the standing position can be adjusted by adjusting the connection position of the gas spring and the holding member by the position adjusting portion. If the angle is made smaller, the force of the gas spring via the link member toward the rear seat portion becomes smaller, so that it is possible to cope with a user with a light weight. On the other hand, if the forward-inclination angle becomes large, the urging force of the gas spring via the rear seat portion of the link member becomes large, so that it is possible to cope with a user with a heavy weight.

This makes it possible to cope with a plurality of users having different weights (without changing the gas spring to another acting force for each user) with one gas spring, and the versatility of the standing assistance device can be further improved.

In order to achieve the above object, it is preferable that a seat cushion on which a user sits is detachably provided on a seat face frame of a wheelchair main body, and a standing assist device is attached to the seat face frame from which the seat cushion is detached.

According to the wheelchair of the present invention, it is possible to provide a wheelchair in which a user can safely assist a standing motion and a sitting motion without sliding down from a seat portion.

Further, since the rising assist device can be easily detached from the seat frame of the wheelchair when the user of the rising assist device is not required, the user can use the wheelchair as a normal wheelchair by simply attaching the original seat cushion to the detached seat frame.

In the case of a foldable wheelchair, the wheelchair and the standing assist device can be placed in a vehicle or the like by simply detaching the standing assist device from the seat frame of the wheelchair.

According to the present invention, it is possible to provide a standing assist device that can be easily attached to and detached from a seat frame of a wheelchair from which a seat cushion is detached, and that can safely assist a standing operation and a sitting operation without a user slipping off from a seat, and a wheelchair having the standing assist device mounted thereon.

Drawings

Fig. 1 is a perspective view of a sitting position in a first embodiment of the rise assist device of the present invention.

Fig. 2 is a side view of the rise aid in the sitting position.

Fig. 3 is a side view of the rise aid in the raised position.

Fig. 4 is a plan view illustrating the frame width adjusting device provided in the standing assist device.

Fig. 5 is a side view of the rise aid in the stowed position.

Fig. 6 is a schematic view showing the holding member and the lock mechanism of the standing assist device in the housed position.

Fig. 7 is a perspective view illustrating the overall structure of the folding wheelchair with the seat cushion removed.

Fig. 8 is a perspective view showing the entire structure of the folding wheelchair with the seat cushion attached.

Fig. 9 is an explanatory view of a method of attaching and detaching a seat cushion in the foldable wheelchair.

Fig. 10 is an explanatory view of the front side frame of the standing assist device attached to the seat frame of the wheelchair.

Fig. 11 is an explanatory view of the mounting of the rear side frame of the standing assist device to the seat frame of the wheelchair.

Fig. 12 is a perspective view of a seat portion of the rise assist device in the wheelchair of the present invention in a seating position.

Fig. 13 is a perspective view of the seat of the rise assist device in the wheelchair of the present invention in a rising position.

Fig. 14 is a side view for explaining a standing operation of a user in the wheelchair of the present invention.

Fig. 15 is a side view of the seat portion in the seating position in the second embodiment of the rise assist device.

Fig. 16 is a side view of the seat portion in the standing position in the second embodiment of the standing assist device.

Fig. 17 is a side view of the seat portion in the standing position in the third embodiment of the standing assist device.

Detailed Description

Hereinafter, preferred embodiments of the standing assist device and the wheelchair having the standing assist device according to the present invention will be described in detail with reference to the accompanying drawings.

The standing-up assist device of the present invention is configured to be detachably attached to a seat frame of a wheelchair from which a seat cushion is removed. A method of detaching a seat cushion of a wheelchair from a seat face frame and attaching a standing assist device to the seat face frame will be described in the overall structure of the wheelchair.

[ entire Structure of the first embodiment of the standing assistance device ]

Fig. 1 is a perspective view of a sitting position in a first embodiment of a rise assist device 10 of the present invention. Fig. 2 is a side view of the standing assist device 10 in the sitting position, and fig. 3 is a side view of the standing assist device 10 in the standing position.

As shown in fig. 1 to 3, the standing assist device 10 is mainly composed of: a main body frame 16 detachably mounted on a seat frame 14 (see fig. 7 and 8) of the wheelchair 12 (see fig. 7 and 8); a seat 18 provided on the main body frame 16; a seat moving mechanism 20 that moves the seat 18 between a seating position parallel to the main body frame 16 and a standing position tilted forward with respect to the main body frame 16; a reverse buckling prevention member 24 that prevents the seat 18 from reversely buckling at the position of the hinge 22; and a tonneau forward-inclination adjusting device 26.

The X, Y, and Z axes shown in the drawings are directions when the standing assist device 10 is attached to the wheelchair 12, and indicate a width direction (left-right direction), a front-back direction, and a vertical direction when viewed from the wheelchair 12. That is, the X-axis direction indicates the left-right direction (the X1 direction is the left direction, and the X2 direction is the right direction) which is the width direction of the wheelchair 12 and the standing assist apparatus 10, the Y-axis direction indicates the front-rear direction (the Y1 direction is the front, and the Y2 direction is the rear) of the wheelchair 12 and the standing assist apparatus 10, and the Z-axis direction indicates the up-down direction (the Z1 direction is the upper direction, and the Z2 direction is the lower direction) of the wheelchair 12 and the standing assist apparatus 10.

The seat 18 is inclined forward relative to the main body frame 16 in a state where the rear end portion of the seat 18 is farther from the main body frame 16 than the front end portion and the seat 18 is inclined upward on the right side as shown in fig. 3.

The material of the standing assist device 10 can be appropriately selected from, for example, metals such as iron, stainless steel, and aluminum, resins, wood, and combinations thereof, from the viewpoint of both rigidity (safe use) and weight (easy transportation).

(Structure of main body frame)

As shown in fig. 1 to 3, the body frame 16 is detachably engaged with the seat frame 14 of the wheelchair 12. The main body frame 16 is constituted by: the present invention relates to a vehicle body frame structure including a front frame 28 and a rear frame 30 arranged in parallel with each other, a pair of coupling frames 32 coupling the front frame 28 and the rear frame 30, engaging portions 34, 48 provided at both ends of the front frame 28 and the rear frame 30, respectively, and frame width adjusting devices 36, 37.

The pair of coupling frames 32 extend in the front-rear direction at equal intervals from a line connecting the widthwise centers of the front and rear side frames 28, 30 and are coupled to the front and rear side frames 28, 30 by welding or the like. That is, a rectangular space 52 is formed between the pair of coupling frames 32. The function of the space 52 will be described in the description of the seat moving mechanism 20.

The shape and size of the wheelchair 12 are defined by JIS (japanese industrial standards), and the width of the seating surface (also referred to as seat width) of the seating surface frame 14 is three types of 42cm, 40cm, and 38cm in the case of the manual type, according to the large size, the medium size, and the small size. In addition, there are sports, japanese-style rooms, electric wheelchairs, and the like, and the width of the seating surface is determined respectively. The seat width also differs between the wheelchair 12 in japan and foreign countries, and the seat width of the wheelchair 12 in foreign countries is set to 44 cm.

Therefore, if the width of the main body frame 16 of the standing assistance device 10 is designed for a small wheelchair, for example, it cannot be mounted on a medium-or large-sized wheelchair and a foreign wheelchair. Even if the erection assistance device 10 designed for a small-sized wheelchair can be forcibly attached to the middle-or large-sized wheelchair 12, mounting looseness occurs.

Therefore, as in the present invention, it is important that the rise assist device 10 detachably attached to the seat frame 14 (see fig. 7) from which the seat cushion 13 (see fig. 8 and 9) of the wheelchair 12 is removed can be attached without generating mounting looseness even if the seat width L2 (see fig. 7) of the wheelchair 12 is different.

Therefore, the standing assistance device 10 of the present invention is provided with frame width adjusting devices 36 and 37 and engaging portions 34 and 48 at both end portions of the front side frame 28 and the rear side frame 30, respectively.

(Structure of front frame and rear frame)

Fig. 4 is a plan view illustrating the frame width adjusting devices 36 and 37 and the engaging portions 34 and 48 provided on the front side frame 28 and the rear side frame 30 of the main body frame 16 constituting the standing assistance device 10.

In fig. 4, the left and right seating frames 14A and 14B constituting the seating frame 14 of the wheelchair 12 are shown by broken lines. The seat frame 14 will be described in detail below with reference to the overall structure of the wheelchair 12.

As shown in fig. 1 and 4, the front frame 28 is formed in a sleeve structure of a front outer tube 38 having a square tubular shape and a pair of front inner tubes 40, 40 having a square tubular shape slidably supported at both ends of the front outer tube 38. The front frame 28 is provided with a pair of front locking members 42, 42 for locking the pair of front inner cylinders 40, 40 at arbitrary sliding positions.

Similarly, the rear frame 30 is formed in a sleeve structure of a rear outer tube 44 having a square tube shape and a pair of rear inner tubes 46, 46 having a square tube shape and slidably supported at both ends of the rear outer tube 44. The rear frame 30 is provided with a pair of rear locking members 50, 50 for locking the pair of rear inner cylinders 46, 46 at arbitrary sliding positions.

Thus, the frame width adjusting devices 36 and 37 for adjusting the lengths of the front and rear side frames 28 and 30, that is, the width of the main body frame 16 are configured by providing the front and rear side frames 28 and 30 with the grommet structures and providing the lock members 42 and 50.

Further, a pair of front engaging portions 34, 34 that engage with the seat cushion frames 14(14A, 14B) of the wheelchair 12 are provided at the ends of the pair of front inner cylinders 40, 40. Similarly, a pair of rear engaging portions 48, 48 that engage with the seat cushion frames 14(14A, 14B) of the wheelchair 12 are provided at the ends of the pair of rear inner cylinders 46, 46.

The front engaging portion 34 (or the rear engaging portion 48) is formed in an inverted L shape in cross section by a support plate 34A (or a support plate 48A) and a hook plate 34B (or a hook plate 48B) that hooks the upper surface of the seat cushion frame 14, and the support plate 34A (or the support plate 48A) abuts against the side surface of the seat cushion frame 14 when the front inner tube 40 (or the rear inner tube 46) is slid outward to extend the front side frame 28 (or the rear side frame 30).

Thus, by providing the frame width adjusting devices 36 and 37 and the engaging portions 34 and 48 on the front side frame 28 and the rear side frame 30, the main body frame 16 of the standing assistance device 10 can be detachably engaged with the seat cushion frames 14 of the wheelchairs 12 having different seat cushion widths.

Here, as shown in fig. 4, a state in which the front inner cylinder 40 (or the rear inner cylinder 46) is pushed into the front outer cylinder 38 (or the rear outer cylinder 44) until the abutting plate 34A (or the abutting plate 48A) of the front engaging portion 34 (or the rear engaging portion 48) comes into contact with the front outer cylinder 38 (or the rear outer cylinder 44) is taken as a basic length L1 of the front side frame 28 and the rear side frame 30, and strictly speaking, the basic length L1 includes the thickness of the abutting plate 34A of the front engaging portion 34 (or the rear engaging portion 48), but the thickness of the abutting plate 34A is not shown in fig. 4.

In order to further enhance the engagement between the body frame 16 of the rise assist device 10 and the seat cushion frame 14 of the wheelchair 12, additional engagement members (for example, a surface fastener capable of being wound around the seat cushion frame 14 of the wheelchair 12) may be provided on the front side engagement portion 34 and the rear side engagement portion 48.

In the present embodiment, as the locking members 42 and 50, a hole having an internal thread is bored in the front outer cylinder 38 (or the rear outer cylinder 44) and a bolt is screwed into the hole. Thus, by screwing the bolt at an arbitrary sliding position of the front inner tube 40 (or the rear inner tube 46), the front inner tube 40 (or the rear inner tube 46) can be pressed by the bolt to fix the sliding of the front inner tube 40 (or the rear inner tube 46).

Further, a plurality of holes are formed in the longitudinal direction of the front inner cylinder 40 (or the rear inner cylinder 46), and bolts are inserted through both the front outer cylinder 38 (or the rear outer cylinder 44) and the front inner cylinder 40 (or the rear inner cylinder 46), whereby the slide can be reliably fixed.

(Structure of seat)

As shown in fig. 1 to 3, the seat 18 mainly includes a front seat 60 disposed on the front side frame 28 side and a rear seat 62 disposed on the rear side frame 30 side, the front seat 60 and the rear seat 62 are connected by a hinge 22, and a front end portion of the front seat 60 (also a front end portion of the seat 18) is vertically rotatably supported by a front end portion of the main body frame 16.

That is, a pair of seat shaft support portions 64, 64 are provided upright on the upper surfaces of both end portions of the front outer cylinder 38 of the front side frame 28, and a shaft support hole is formed in each seat shaft support portion 64. On the other hand, the front seat section 60 has bent portions 66 bent downward at both side edges thereof, and a pair of pivot pins 68, 68 protruding outward in the width direction of the front seat section 60 are provided at the front end portions of the bent portions 66. Then, a pair of pivot pins 68 are inserted into the shaft support holes of the seat shaft support portions 64. Thus, the seat 18 is vertically rotatably supported by the pair of seat shaft supporting portions 64.

The front seat portion 60 and the rear seat portion 62 may include a cover (not shown) in which a cushion material and the like are enclosed, and the cover may be configured to be detachable.

The front seat portion 60 is a flat plate-like plate material including a rear edge 60A. The upper surface of the front seat portion 60 is a portion on which the thighs are mainly supported when the user P (see fig. 14) is seated. The rear edge 60A of the front seat 60 is formed by three convex portions that are spaced apart from each other at equal intervals and protrude rearward.

The rear seat portion 62 is a flat plate-like plate material including a front edge 62A and a rear edge 62B. The upper surface of the rear seat portion 62 is a portion where the user P sits mainly to bear the buttocks. The rear seat portion 62 has a shape in which both ends in the width direction are slightly raised upward (see fig. 1), and a cross section in the width direction (a cross section taken along a plane parallel to the XZ plane) is concave in shape in accordance with the shape of the buttocks.

The front edge 62A of the rear seat portion 62 is formed by three convex portions that are spaced apart from each other at equal intervals and protrude forward. The three protrusions are formed at positions corresponding to the three protrusions of the rear edge 60A of the front seat portion 60. The three convex portions constituting the rear edge 60A of the front seat portion 60 and the three convex portions constituting the front edge 62A of the rear seat portion 62 are hinge-connected by the three hinges 22. Thereby, the rear seat portion 62 can swing with respect to the front seat portion 60. On the other hand, the rear edge 62B of the tonneau portion 62 constitutes a free end.

Thus, the seat 18 is configured to hinge the front seat 60 and the rear seat 62 by the hinge 22. Therefore, after the standing assist device 10 is attached to the wheelchair 12, when the user sits on the seat 18, it is necessary to prevent the front seat 60 and the rear seat 62 from being warped reversely with the hinge 22 as a boundary.

Therefore, the rise assist device 10 is provided with the reverse buckling prevention member 24. The reverse buckling means that the front seat portion 60 and the rear seat portion 62 are bent downward with the hinge 22 as a boundary and the seat portion 18 is formed in a V shape.

(Structure of reverse warpage preventing Member)

The reverse buckling prevention member 24 prevents the seat portion 18 from reversely buckling downward at the position of the hinge 22, and the reverse buckling prevention member 24 is disposed directly below the hinge 22 disposed at the center among the three hinges 22 (see fig. 1). The reverse warpage prevention device is not limited to the above-described example, and any device may be used as long as it can prevent reverse warpage. For example, a hinge may be used in which the hinge 22 itself cannot open more than 180 degrees.

As shown in fig. 1 to 3, the reverse buckling prevention member 24 can appropriately use a structure in which a rod-like member 70 is suspended between the front seat portion 60 and the rear seat portion 62 directly below the hinge 22. Here, suspending the rod member 70 between the front seat portion 60 and the rear seat portion 62 means that both ends of the rod member 70 become free ends that are not fixed to the front seat portion 60 and the rear seat portion 62.

A pair of brackets 72, 72 for suspending the rod-like member 70 are provided on the rear end lower surface of the front seat portion 60 and the front end lower surface of the rear seat portion 62 so as to face each other. Through holes (not shown) are formed in the opposed surfaces 72A, 72A of the pair of brackets 72, respectively, so as to face each other. A bolt-shaped bar member 70 having a thread formed at one end portion thereof penetrates through the pair of opposed through holes, and a nut 73 is screwed to the thread. The head of the bolt of the rod-like member 70 and the nut 73 are formed to have a larger diameter than the through hole. The distance from the head of the bolt of the bar-shaped member 70 to the nut is set to be greater than the distance between the facing surfaces 72A of the pair of brackets 72 in the state where the seat 18 is at the seating position.

When the seat unit 18 moves from the seating position to the standing position, the front seat unit 60 and the rear seat unit 62 rotate about the hinge 22, the distance between the facing surfaces 72A of the pair of brackets 72 changes, and both ends of the bar-shaped member 70 hang on the pair of brackets 72 and become free ends. Therefore, the reverse buckling prevention member 24 can prevent the seat portion 18 from buckling reversely so as not to interfere with the rotating operation of the hinge 22.

Since the reverse buckling prevention member 24 is disposed directly below the hinge 22, even if the front seat portion 60 or the rear seat portion 62 is supposed to be bent due to the reverse buckling, the bar-shaped member 70 is less likely to be affected by the bending, and the force generated by the bending can be suppressed from being applied. Therefore, the rigidity required for the reverse buckling prevention member 24 can be reduced, and the reverse buckling prevention member 24 and thus the erection assistance device 10 can be reduced in weight.

In addition, from the viewpoint of weight reduction, it is more preferable to provide one reverse buckling prevention member 24 at the hinge 22 at the center, but it is also possible to provide a further additional hinge 22 at both ends.

(Structure of seat moving mechanism)

Any mechanism may be used for the seat moving mechanism 20 as long as it is: the seat portion 18 is moved between a seating position parallel to the main body frame 16 and a standing position tilted forward with respect to the main body frame 16 by vertically rotating the seat portion 18 with the seat face shaft support portion 64 as a rotation center, and the seat face shaft support portion 64 shaft-supports the front end portion of the seat portion 18 to the front end portion of the main body frame 16.

Although not shown, the seat moving mechanism 20 can be constructed by a combination of an actuator for rotating the seat 18 up and down and a power battery, for example. As the actuator, for example, a hydraulic or pneumatic cylinder device, a combination of an electric motor and a ball screw mechanism, or the like can be used.

However, since the mechanism using the power supply battery is a factor for weighting the standing assist device 10, in the present embodiment, an example in which the gas spring 58 that does not require a power supply is used as the actuator of the seat moving mechanism 20 will be described below.

As shown in fig. 1 to 3, the seat moving mechanism 20 is mainly composed of: a link member 54 including a first link 74 having one end rotatably connected to the center of the lower surface of the rear seat 62 and a second link 76 having one end rotatably connected to the other end of the first link 74 and the other end rotatably connected to the connecting frame 32; a holding member 56 having one end rotatably connected to the connecting frame 32 and the other end extending downward of the connecting frame 32; a gas spring 58 having one end rotatably connected to the other end of the holding member 56 and the other end rotatably connected to the link member 54; and a lock mechanism 78 that restricts movement of the link member 54 by the gas spring 58.

That is, the link member 54 including the first link 74 and the second link 76 has one end rotatably supported by the connecting frame 32 and the other end rotatably supported at the center of the lower surface of the rear seat 62. An upward rotational force is applied to the center of the lower surface of the rear seat portion 62 by the gas spring 58. Thus, if the upward urging force of the gas spring 58 is larger than the load of the user P applied to the rear seat portion 62, the seat portion 18 rotates upward with the seat portion shaft support portion 64 as the rotation center and moves to the standing position. On the other hand, if the load of the user P is larger than the upward force of the gas spring 58, the seat 18 rotates downward with the seat shaft support portion 64 as the rotation center and moves to the seating position. Thereby, the seat portion 18 is movable between a seating position parallel to the main body frame 16 and an upright position tilted forward with respect to the main body frame 16.

The seat moving mechanism 20 is a component of the standing assist device 10, and is supported by the connecting frames 32, 32 of the main body frame 16, and the main body frame 16 is detachably carried on the seat frame 14 of the wheelchair 12 in an engaged state. That is, since the seat portion moving mechanism 20 that moves the seat portion 18 of the rise assist apparatus 10 is constructed as a mechanism separate from the wheelchair 12, it functions independently even if the rise assist apparatus 10 is detached from the wheelchair 12. Therefore, since the dedicated wheelchair 12 for mounting the standing assist apparatus 10 is not required, the standing assist apparatus can be mounted to and used by various wheelchairs 12 that are generally used.

(Structure of Link Member)

As shown in fig. 3, the link member 54 is composed of a first link 74 and a second link 76, and these links 74, 76 are coupled by a link shaft 80.

The first link 74 includes one end 74A and the other end 74B, and is constituted by a pair of link pieces that are disposed apart from each other and face each other in the width direction (X1-X2 direction). The second link 76 includes one end 76A and the other end 76B, and is formed of a pair of link pieces that are disposed apart from each other and face each other in the width direction (X1-X2 direction). The distance between the pair of link pieces of the second link 76 disposed to face each other in the width direction (X1-X2 direction) is larger than the distance between the pair of link pieces of the first link 74 disposed to face each other in the width direction (X1-X2 direction).

In fig. 3, only one of the first link 74 and the second link 76 is shown, but one of the first link 74 and the second link 76 is provided on the back side of the drawing.

One end 74A of the first link 74 is rotatably connected to the center of the lower surface of the rear seat 62. On the other hand, the other end 74B of the first link 74 is rotatably connected to the one end 76A of the second link 76 via the link shaft 80 with the pair of link pieces of the first link 74 sandwiched between the pair of link pieces of the second link 76.

A projection 74C is formed at the other end 74B of the first link 74. The protrusion 74C is formed of a curved surface protruding in a mountain shape in a direction perpendicular to the longitudinal direction of the first link 74 (the direction connecting the one end 74A and the other end 74B). The protrusion 74C abuts against the lower surface of the rear seat portion 62 when the standing assist device 10 is in the seating position (see fig. 2).

The other ends 76B of the second links 76 are rotatably connected to the connecting frames 32, respectively. More specifically, the pair of link pieces of the second link 76 are pivotally supported by the connecting frame 32, respectively.

(Structure of holding Member)

As shown in fig. 1, the holding member 56 is constituted by a pair of holding pieces 56A, 56A arranged to face each other while being spaced apart from each other in the width direction (X1-X2 direction), and a wide-width coupling member 56B that couples the holding pieces 56A and provides the holding member 56 with a required rigidity.

Further, when the standing assist device 10 is in the seating position, the holding member 56 holds the gas spring 58 in the recess defined by the pair of holding pieces 56A and the coupling 56B.

As shown in fig. 3, one ends 56A1 of the pair of holding pieces 56A, 56B are pivotally supported by the coupling frame 32 via the first coupling shafts 82, respectively. Thus, the holding member 56 is rotatable between a position perpendicular to the connecting frame 32 (fig. 1 and 3) and a parallel position (fig. 5). The connection position of the holding piece 56A and the connecting frame 32 is located rearward of the connection position of the other ends 76B of the pair of link pieces of the second link 76 and the connecting frame 32.

As shown in fig. 3, one end 56A1 of the pair of holding pieces 56A is narrowed toward the tip, and a rod-shaped rotation restricting portion 84 that couples the two is formed at the tip of the narrowed width. When the holding member 56 is positioned parallel to the connecting frame 32, the rotation restricting portion 84 engages with the lock mechanism 78 (see fig. 6).

As shown in fig. 3, one end of the gas spring 58 is rotatably connected to the other end 56A2 of the pair of holding pieces 56A via a second connecting shaft 86 connecting the two.

(Structure of gas spring)

As shown in fig. 3, the gas spring 58 includes a cylinder 58A and a movable portion 58B. The gas spring 58 is a spring that generates a repulsive force against a force in the compression direction, and the expansion and contraction direction of the movable portion 58B is guided by the cylinder 58A. That is, the gas spring 58 can be considered as a member that serves as both a compression spring and a guide member.

The gas spring 58 functions as a drive source that applies an upward force to the central lower surface of the rear seat portion 62 to rotate the seat portion 18 about the seat portion shaft support portion 64 as a rotation center. Since the seat portion 18 is pressed upward by the urging force of the gas spring 58, a power source or the like as a driving source for displacing the seat portion 18 is not required, and the rise assist device 10 can be reduced in weight.

The cylinder 58A of the gas spring 58 is sealed, and a high-pressure gas (e.g., nitrogen gas) is sealed inside. The top end of the cylinder 58A (the other end of the gas spring 58) is provided with a circular mounting hole through which the link shaft 80 of the link member 54 passes.

The movable portion 58B of the gas spring 58 includes a piston disposed in the cylinder 58A and a rod connected to the piston, and is extended in the longitudinal direction of the gas spring 58 by the biasing force of the high-pressure gas in the cylinder 58A. A circular mounting hole is provided at the tip end of the movable portion 58B (one end of the gas spring 58), and as shown in fig. 3, the second coupling shaft 86 of the holding member 56 passes through the mounting hole.

The force of the high-pressure gas in the gas spring 58 is appropriately set to the following degree: the movable portion 58B is movable in the compression direction (the direction in which the movable portion 58B approaches the cylinder 58A) by the load of the user P seated on the seat portion 18, and is movable to a storage position in the cylinder 58A. In addition, in order to adjust the urging force of the gas spring 58, a coil spring or the like may be further provided to the gas spring 58.

(Structure of locking mechanism)

As shown in fig. 1 to 3 and 6, the lock mechanism 78 includes: a fixed table 78A, a hook 78B, and a rod 78C. As shown in fig. 1, the fixing stand 78A is fixed to the substantially center of the lower surface of the rear side frame 30 in the width direction. The hook 78B is pivotally supported on a pivot shaft of the fixed base 78A, and is rotatable between an engagement position (fig. 2) where it engages with the link shaft 80 of the link member 54 and a release position (fig. 3) where the engagement is released by operating the lever 78C.

The lock mechanism 78 is engaged with the link shaft 80 of the link member 54 via the hook 78B, and functions as a lock mechanism that restricts the movement of the link member 54 by the gas spring 58.

The hook 78B is biased by a spring (not shown) coupled to the fixed base 78A, and when the seat portion 18 moves from the standing position to the seating position by the load of the user P, the hook 78B rotates by the biasing force and automatically engages with the link shaft 80 of the link member 54.

When the standing assist device 10 is in the seating position, the link member 54 (see fig. 1 and 2) of the seat section moving mechanism 20 is housed in the space 52 between the connecting frames 32. When the standing assist device 10 is in the storage position, the holding member 56 and the gas spring 58 of the seat section moving mechanism 20 are stored in the space 52 in addition to the link member 54 (see fig. 5).

(Structure of Back seat Forward inclination adjusting device)

When the seat portion 18 is moved from the seating position (fig. 2) to the standing position (fig. 3) by the seat portion moving mechanism 20, the tonneau forward-inclination adjusting device 26 gives resistance against an upward rotational force of the seat portion 18 to the rear end side of the tonneau portion 62.

As shown in fig. 1 and 3, the tonneau forward inclination adjustment device 26 includes: a pair of first shaft support portions 26A, a pair of second shaft support portions 26B, and a pair of guide rods 26C, 26C.

In fig. 3, only one first shaft support portion 26A, one second shaft support portion 26B, and one guide bar 26C are illustrated, but one first shaft support portion 26A, one second shaft support portion 26B, and one guide bar 26C are provided on the back side of fig. 3.

As shown in fig. 3, the pair of first shaft support portions 26A are fixed to the upper surface of the coupling frame 32. The connection point between the pair of first axial support portions 26A and the coupling frame 32 is located closer to the front side frame 28 and is located forward than the connection point between the other end 76B of the link piece of the second link 76 and the coupling frame 32.

As shown in fig. 3, the pair of second shaft support portions 26B are fixed to the lower surface of the rear seat portion 62. The connecting portion between the second shaft support portion 26B and the rear seat portion 62 is located closer to the rear end portion 62B of the rear seat portion 62, and is located rearward of the connecting position between the pair of link pieces of the first link 74 and the rear seat portion 62 (i.e., the center of the lower surface of the rear seat portion 62).

As shown in fig. 3, the pair of guide rods 26C are rod-shaped members, and one ends thereof are rotatably and axially supported by the first shaft support portions 26A, and the other ends thereof are rotatably and axially supported by the second shaft support portions 26B. Thereby, the guide rod 26C is rotatable about the first shaft support portion 26A.

That is, the provision of the tonneau forward-tilt adjusting device 26 forms a four-link structure having the front seat portion 60, the rear seat portion 62, the portion of the link frame 32 from the seat portion shaft support portion 64 (the center of rotation of the seat portion 18) to the first shaft support portion 26A, and the guide rod 26C as four joints, and having the seat portion shaft support portion 64, the hinge 22, the first shaft support portion 26A, and the second shaft support portion 26B as four joints. The connection frame 32 portion of the main body frame 16 attached to the seat cushion frame 14 of the wheelchair 12 serves as a fixed link, and the seat moving mechanism 20 pushes up the center of the lower surface of the rear seat 62.

Thus, when the seat unit 18 is moved from the seating position (fig. 2) to the standing position (fig. 3) by the seat unit moving mechanism 20, the rear seat unit forward-inclination adjusting device 26 gives resistance against an upward rotational force of the seat unit 18 to the rear end side of the rear seat unit 62. That is, although the seat portion 18 is rotated upward about the seat portion shaft support portion 64 as a rotation center, the guide rod 26C acts in a direction of preventing the rear end portion of the seat portion 18 (also the rear end portion of the rear seat portion 62) from rotating upward, and therefore the rear seat portion 62 rotates downward about the hinge 22 as a rotation center.

Thus, as shown in fig. 3, the front tilt angle θ 1 of the rear seat portion 62 with respect to the main body frame 16 is smaller than the front tilt angle θ 2 of the front seat portion 60 with respect to the main body frame 16. The front inclination angle θ 1 of the rear seat portion 62 with respect to the main body frame 16 can be changed by adjusting the length of the guide rod 26C.

[ integral Structure of wheelchair ]

Next, the wheelchair 12 to which the standing assist apparatus 10 configured as described above is attached will be described.

Fig. 7 and 8 are perspective views of an example of the wheelchair 12, which is a foldable wheelchair 12. Fig. 7 is a perspective view of the wheelchair 12 with the seat cushion 13 removed from the seat frame 14, and fig. 8 is a perspective view of the wheelchair with the seat cushion 13 attached. Moreover, the left-right symmetric portions are appropriately omitted from the description.

As shown in fig. 7 and 8, the foldable wheelchair 12 includes a wheelchair main body 88 and a seat cushion 13 (see fig. 8) detachably attached to a seat frame 14(14A, 14B) of the wheelchair main body 88.

(wheelchair main body)

The wheelchair main body 88 is mainly composed of the following components: a pair of side frames 90, 92 disposed so as to be spaced apart and opposed to each other in the width direction (X1-X2 direction), a cross link 94 connecting the side frames 90, 92 to each other in the width direction (X1-X2 direction), a seat cushion frame 14 fixed to the cross link 94, and wheels 96, 98 attached to the side frames 90, 92.

The seating surface left frame 14A and the seating surface right frame 14B constituting the seating surface frame 14 are formed of a pair of long pipes extending in the front-rear direction (Y1-Y2 direction) of the wheelchair 12, the seating surface left frame 14A and the seating surface right frame 14B are disposed facing each other so as to be spaced apart and parallel to each other in the width direction (X1-X2 direction) of the wheelchair 12, and the distance between the seating surface left frame 14A and the seating surface right frame 14B in the folded and unfolded state (see fig. 7) is a seating surface width L2 of the wheelchair 12.

A foldable seat cushion 13 (see fig. 8) is detachably provided to the seat frame 14 of the wheelchair 12. The foldable seat cushion 13 is usually a soft seat cushion 13 made of cloth or the like, but may be a hard seat cushion 13 having a folding structure. In the present embodiment, the cloth seat cushion 13 will be described.

The side frames 90, 92 are formed in bilateral symmetry with each other, and are formed in a square shape, for example, by a pipe, as in the side frame of the conventional folding wheelchair 12. Further, the side frames 90, 92 are provided with large-diameter wheels (rear wheels) 96, small-diameter casters 98, handles 100, armrest portions 102, and foot boards 104, 104.

A foldable backrest 106 made of, for example, cloth is attached between the rear portions of the side frames 90 and 92.

The cross link 94 is formed of a pair of link members 94A, 94A crossing in an X shape when viewed from the front. The pair of link members 94A, 94A are arranged in parallel on the front side and the rear side of the wheelchair 12, respectively.

The upper ends of the pair of link members 94A, 94A are fixed to the seating surface left frame 14A and the seating surface right frame 14B constituting the seating surface frame 14 by welding or the like, respectively, and the lower ends of the pair of link members 94A, 94A are fixed to the lower side frames 90A, 92A of the left side frame 90 and the right side frame 92 by welding or the like, respectively.

Thereby, the pair of link members 94A, 94A swing about the intersection point M thereof, and the interval in the width direction (X1-X2) of the side frames 90, 92 is changed, whereby the wheelchair 12 can be folded or unfolded.

Fig. 9 is a diagram for explaining a method of detachably attaching the seat cushion 13 to the seat cushion frame 14, and the right side frame 92, wheels 96 and 98 attached thereto, and the like are shown by broken lines so that the attached portion can be easily seen.

As shown in fig. 9, a plurality of coupling holes 108 and 108 … are formed at equal intervals in the front-rear direction (Y1-Y2) of the seat left frame 14A and the seat right frame 14B constituting the seat frame 14, and female screws are engraved in the coupling holes 108. On the other hand, a plurality of insertion holes 110, 110 … are formed at positions corresponding to the coupling holes 108 in a state where the seat cushion 13 is placed on the seat cushion frame 14 along the front-rear direction (Y1-Y2) of both end portions in the width direction (X1-X2) of the seat cushion 13, and bolts 112, 112 … screwed to the coupling holes 108 are inserted into the insertion holes 110.

Thus, when the seat cushion 13 is attached to the seat cushion frame 14, the seat cushion 13 may be placed on the seat cushion frame 14 and the bolts 112 may be fastened and coupled to the coupling holes 108 formed in the seat cushion left frame 14A and the seat cushion right frame 14B. When the seat cushion 13 is detached from the seat cushion frame 14, the bolt 112 is loosened to release the screw connection with the coupling hole 108 of the seat cushion frame 14, and the seat cushion can be detached.

Further, although the example of the bolt 112 formed in the coupling hole 108 of the seat cushion frame 14 and the insertion hole 110 provided in the seat cushion 13 has been described as a member for attaching the seat cushion 13 to the seat cushion frame 14, the present invention is not limited thereto, and any member may be used as long as the seat cushion 13 is detachably attached to the seat cushion frame 14.

The above description has been made with an example of the foldable wheelchair 12, but the same applies to a wheelchair that cannot be folded. In short, the wheelchair 12 may be any one in which the seat cushion 13 on which the user P sits can be detachably attached to the seat cushion frame 14 of the wheelchair main body 88.

(method of mounting standing assist device to wheelchair)

Next, a method of attaching the standing assist device 10 to the wheelchair 12 will be described, and in the present embodiment, a case will be described in which the seating surface width L2 (see fig. 7) of the wheelchair 12 is larger than the basic length L1 (see fig. 4) of the front side frame 28 and the rear side frame 30 of the standing assist device 10.

First, as described with reference to fig. 9, the bolts 112 of the seat cushion 13 of the wheelchair 12 are loosened to release the screw connection with the coupling holes 108 of the seat cushion 14, and the seat cushion 13 is detached from the seat cushion frame 14.

Next, as shown in fig. 10 and 11, the main body frame 16 of the rise assist apparatus 10 is detachably attached to the seat cushion frame 14(14A, 14B) of the wheelchair from which the seat cushion 13 is removed, by the frame width adjusting devices 36, 37 provided on the front side frame 28 and the rear side frame 30 of the rise assist apparatus 10. In fig. 10 and 11, the seat 18 is moved to the standing position in order to facilitate understanding of the state in which the body frame 16 of the standing support apparatus 10 is attached to the seat frame 14 of the wheelchair 12.

That is, as shown in fig. 10 and 11, the inner cylinders 40 and 46 of the front side frame 28 and the rear side frame 30 of the rise assist device 10 are slid so as to be drawn out from the outer cylinders 38 and 44, and the abutting plates 34A and 48A of the front side engaging portion 34 and the rear side engaging portion 48 are abutted against the inner surfaces of the seating surface left frame 14A and the seating surface right frame 14B of the wheelchair 12, respectively.

Hook plates 34B, 48B of the front engaging portion 34 and the rear engaging portion 48 are respectively hooked on the upper surfaces of the seating surface left frame 14A and the seating surface right frame 14B of the wheelchair 12.

In this state, the inner cylinders 40 and 46 of the front and rear frames 28 and 30 are fixed to the outer cylinders 38 and 44 by fastening with the lock members 42 and 50. Thus, the body frame 16 of the rise assist device 10 can be mounted on the seat frame 14 of the wheelchair 12 in the engaged state.

Thus, by attaching the standing assist device 10 to the wheelchair 12 with the seat cushion 13 removed, as shown in fig. 12 and 13, the wheelchair 12 of the embodiment of the present invention to which the standing assist device 10 of the present invention is attached is formed. Fig. 12 shows a state where the seat portion 18 of the rise assist device 10 attached to the wheelchair 12 is in the seating position, and fig. 13 shows a state where the seat portion 18 is in the rising position.

In this attachment operation, by providing the frame width adjusting devices 36 and 37 on the front side frame 28 and the rear side frame 30 of the standing assist device 10, the wheelchair 12 having different seat widths L2 can be attached without causing loose attachment.

The basic length L1 of the front and rear frames 28, 30 may be designed to be able to be attached to a wheelchair 12 having a small seating surface width L2 (e.g., the seating surface width of a small japanese wheelchair).

That is, the length of the outer cylinders 38, 44 is designed so that the inner cylinders 40, 46 can be attached to the wheelchair 12 (for example, the seating surface width of a small-sized japanese wheelchair) having the small seating surface width L2 in a state where the inner cylinders 40, 46 are not pulled out from the outer cylinders 38, 44 (a state where the abutting plates 34A, 48A of the front engaging portion 34 or the rear engaging portion 48 abut on the end surfaces of the outer cylinders 38, 44 by the basic length L1).

On the other hand, the length of the inner cylinders 40, 46 is designed to ensure the rigidity of the front and rear side frames 28, 30 even if the inner cylinders 40, 46 are drawn out from the outer cylinders 38, 44 in order to fit a wheelchair 12 having a large seating surface width L2 (for example, seating surface width of an European and American wheelchair). in other words, the length of the inner cylinders 40, 46 is designed to ensure the rigidity of the sleeve structure even if the inner cylinders 40, 46 are drawn out from the outer cylinders 38, 44 in order to fit a wheelchair 12 having a large seating surface width L2.

If designed as described above, the standing assist device 10 can be attached to wheelchairs 12 having various seating surface widths L2 without being loosened.

In addition, as described above, when the standing assist device 10 is attached to the wheelchair 12, another structure (for example, the cross link 94 crossing in an X-shape in front view) may be disposed below the center of the seating surface of the wheelchair 12.

However, as shown in fig. 1 and 2, the holding member 56 and the gas spring 58 of the standing assistance device 10 are arranged rearward of the center of the rear seat 62. Therefore, in a state where the standing assist apparatus 10 is attached to the wheelchair 12, the holding member 56 and the gas spring 58 do not interfere with another structure (for example, the cross link 94) disposed below the center of the seat surface of the wheelchair 12.

The holding member 56 and the gas spring 58 can be disposed rearward of the center of the rear seat portion 62 because the lift assist apparatus 10 transmits the urging force of the gas spring 58 to the center of the lower surface of the rear seat portion 62 via the link member 54. In other words, by having the link member 54, the positions of the holding member 56 and the gas spring 58 can be arranged more rearward than the center of the tonneau portion 62.

In addition, by appropriately setting the lengths and the connection positions of the link member 54 and the gas spring 58, the position of the gas spring 58 (and the holding member 56) can be appropriately designed in the front-rear direction of the backseat 62. Since the degree of freedom in design is high in the arrangement of the gas spring 58 (and the holding member 56), the rise assist device 10 can be applied to various types of wheelchairs 12.

[ method of Using the standing assistance device ]

Next, a method for assisting the rising operation or sitting operation of the user P by the rising assistance device 10 attached to the wheelchair 12 will be described.

(Release of locking mechanism)

First, the lock mechanism 78 of the standing assist device 10 is released.

In a state where the standing assistance device 10 is attached to the wheelchair 12 and the user P is seated in front of the seat 18, no load is applied to the seat 18. At this time, the hook 78B of the lock mechanism 78 strongly receives the upward urging force of the gas spring 58 (the rotational force that rotates the seat portion 18 upward) via the link shaft 80 of the link member 54. Thus, the hook 78B of the lock mechanism 78 is firmly engaged with the link shaft 80 and is not rotatable (the lever 78C cannot be operated). In this state, the gas spring 58 is compressed maximally, so that the acting force is maximized.

That is, the standing assist device 10 cannot release the lock of the lock mechanism 78 in a state where the user P is seated in front of the seat 18. Therefore, in a state where the user P is seated in front of the seat 18, the seat 18 can be prevented from moving to the standing position by accidentally releasing the engagement between the link member 54 and the hook 78B. This is important from a safety point of view.

After the standing assist device 10 is attached to the wheelchair 12, if the user P sits on the seat portion 18, the link shaft 80 of the link member 54 is applied with a downward force due to the self weight of the user, which counteracts the upward urging force of the gas spring 58. Thereby, the hook 78B of the lock mechanism 78 is slightly separated from the link shaft 80, and the lever 78C can be operated.

In this state, if the lever 78C is operated to rotate the hook 78B, the lock of the lock mechanism 78 is released.

From the viewpoint of safety, it is preferable that the user P seated on the seat 18 operates the lever 78C by himself/herself, and that the user P be operated by a caregiver (not shown). In this regard, the lock mechanism 78 is provided substantially at the center in the width direction of the lower surface of the rear side frame 30. Accordingly, in a state where the user P is seated on the seat 18, the user P is not easy to operate because the user P is located at a position on the back side of the user P where the arms are hard to reach. Thus, the user P and the caregiver can naturally recognize that the lock of the lock mechanism 78 is released not by the user P but by the caregiver.

(user's standing up action)

Next, the standing operation of the user P using the standing assistance device 10 will be described.

When the lock of the lock mechanism 78 is released, as shown in fig. 14, if the user P lifts the hip from the seat 18 by the leg power of the user P or the assistance of the caregiver, the load on the seat 18 is reduced. If the load is smaller than the urging force of the gas spring 58 in the seat moving mechanism 20, the movable portion 58B of the gas spring 58 extends to push up the link shaft 80 of the link member 54.

Thereby, the link member 54 moves from a bent state (a state in which the first link 74 and the second link 76 overlap, see fig. 1 and 2) to an expanded state (a state in which the first link 74 and the second link 76 are separated in the vertical direction, see fig. 3).

With the movement of the link member 54, the seat 18 is rotated upward about the seat surface shaft support portion 64 as a rotation center, the seat 18 is moved to the standing position, and the seat 18 is tilted forward with respect to the main body frame 16 (see fig. 14). Thereby providing the upward and forward force required for the user P to stand up.

In the above-described standing operation of the user P, if an upward rotational force is applied to the central lower surface of the tonneau section 62 by the tonneau section moving mechanism 20, the tonneau section 18 as a whole is rotated upward about the tonneau section shaft support section 64 as a rotation center and moved from the sitting position to the standing position, and at the same time, a force against the upward rotational force is applied to the rear end portion of the tonneau section 62 by the tonneau section forward inclination adjusting device 26. Thereby, the rear seat portion 62 rotates downward with the hinge 22 as a rotation center.

Therefore, as shown in fig. 3, the front tilt angle θ 1 of the rear seat portion 62 with respect to the main body frame 16 is smaller than the front tilt angle θ 2 of the front seat portion 60 with respect to the main body frame 16 (see fig. 14).

The forward inclination angle θ 1 of the rear seat portion 62 is preferably in the range of 5 ° to 15 °, and more preferably in the range of 5 ° to 10 °. The forward inclination angle θ 1 of the tonneau section 62 can be adjusted by adjusting the length of the guide rod 26C of the tonneau section forward inclination adjustment device 26.

Thus, as shown in fig. 14, when the seat section 18 is moved from the seating position to the standing position, the hip section of the user P does not slide off from the rear seat section 62 like a slide due to an excessively large forward inclination angle θ 1 of the rear seat section 62 with respect to the main body frame 16. As a result, the user P can safely perform the standing operation.

On the other hand, the front seat portion 60, which receives the thighs of the user P in the sitting position, has a larger forward inclination angle θ 2 than the rear seat portion 62, and can assist the standing up operation of the user P. As can be seen from fig. 14, the forward inclination angle θ 2 of the front seat portion 60 is preferably as follows: in the standing operation of the user P, the entire foot surface of the user P reliably steps on the floor (or the floor) when the user P stands up by the leg and foot force of the user P or the assistance of the caregiver. Specifically, the forward inclination angle θ 2 of the front seat portion 60 is preferably in the range of 35 ° to 45 °.

Further, by the first link 74 of the link member 54 being disposed at the center of the lower surface of the rear seat portion 62, the urging force of the gas spring 58 via the link member 54 is applied to the center of the lower surface of the rear seat portion 62. Therefore, the urging force of the gas spring 58 is applied to the central portion of the hip portion of the seated user P (the position of the center of gravity of the seated user) via the link member 54. This enables the rear seat portion 62 to be lifted more stably than when other portions of the seat portion 18 are pressed by the gas spring 58. Further, the sense of incongruity of the user P caused by the urging force of the gas spring 58 can be reduced.

Further, since the urging force of the gas spring 58 is applied to the position of the center of gravity of the user P seated on the seat portion 18 via the link member 54, the rigidity required for the seat portion 18 itself can be made smaller than in the case where other portions of the seat portion 18 are pressed by the gas spring 58. Therefore, the seat 18 can be reduced in weight.

(Sitting action of user)

Next, a sitting operation of the user P using the standing assistance apparatus 10 will be described.

In a state where the standing assist device 10 is in the standing position (see fig. 13 and 14), if the user P sits on the seat portion 18 and weakens the leg and foot forces, the load on the seat portion 18 due to the self weight of the user P increases. If the load is larger than the urging force of the gas spring 58, the movable portion 58B of the gas spring 58 contracts to compress the gas spring 58.

Thereby, the link member 54 is moved from the expanded state (the state in which the first link 74 and the second link 76 are separated in the vertical direction) to the bent state (the state in which the first link 74 and the second link 76 overlap). The front seat portion 60 and the rear seat portion 62 move to the seating position parallel to the main body frame 16 with the movement of the link member 54 (see fig. 12).

A projection 74C (see fig. 3) provided at the other end 74B of the first link 74 abuts against the rear seat portion 62 when the seat portion 18 moves from the standing position to the seating position. Since the gas spring 58 increases the force with compression, the link member 54 receives a stronger force as the seat portion 18 moves to the seating position. However, the strong urging force can be transmitted not only to the one end 74A of the first link 74 but also to the rear seat portion 62 via the projection 74C of the other end 74B of the first link 74.

That is, when the seat portion 18 is moved to the seating position, the strong urging force applied to the link member 54 can be dispersed in two directions. Therefore, the rigidity required for the link member 54 can be reduced, and therefore the link member 54 can be reduced in weight.

In addition, in accordance with the movement of the link member 54, the hook 78B of the lock mechanism 78 is rotated by receiving an urging force from a spring (not shown) coupled to the fixed base 78A, and is engaged with the link shaft 80 of the link member 54 to perform locking. That is, the lock mechanism 78 automatically operates as the user P sits.

Thus, the standing assistance device 10 according to the embodiment of the present invention can be easily attached to and detached from the seat frame 14 from which the seat cushion 13 of the wheelchair 12 is removed, and the user P can safely assist the standing operation and the sitting operation without sliding down from the seat 18.

In the present embodiment, although the example of the gas spring 58 has been described as the actuator of the seat moving mechanism 20, in the case where a cylinder device, a combination of an electric motor and a ball screw mechanism, or the like is used as the actuator, the operation of the actuator is preferably performed by the caregiver rather than the user P in terms of safety.

(transportation of standing assistance device)

Next, the transportation of the lift assist apparatus 10 detached from the wheelchair 12 will be described.

When the standing assist device 10 is detached from the wheelchair 12 and transported, the standing assist device 10 can be deformed to the storage position. More specifically, the holding member 56 is rotated from a position perpendicular to the coupling frame 32 (fig. 1 and 2) to a parallel housing position (fig. 5). At this time, the gas spring 58 connected to the holding member 56 also rotates. Therefore, since the holding member 56 and the gas spring 58 do not protrude, the entire rise assist device 10 can be made compact. Thereby facilitating transportation.

Here, if the holding member 56 is rotated to the storage position, the gas spring 58 is also moved to a position parallel to the coupling frame 32, and the direction of the urging force of the gas spring 58 is displaced by 90 degrees (from the bottom to the top to the front to the back). Thus, the urging force of the gas spring 58 is not applied or reduced to the hook 78B of the lock mechanism 78 via the link member 54.

However, as shown in fig. 6, if the holding member 56 is moved to the storage position, the rotation restricting portion 84 of the holding member 56 engages with a recess provided in the hook 78B of the lock mechanism 78. Thereby, the movement of the hook 78B in the rotational direction (the arrow a direction in fig. 6) is restricted. Therefore, even if the urging force of the gas spring 58 is not applied to the hook 78B of the lock mechanism 78 via the link member 54, the hook 78B cannot be rotated, and therefore the lock is not released. That is, as long as the erection assistance device 10 is in the storage position, the lock of the lock mechanism 78 cannot be released, and therefore the erection assistance device 10 can be prevented from moving to the erection position during conveyance.

[ second embodiment of the standing-up assistance device ]

The first embodiment of the standing assistance device 10 is an example for explaining the present invention, and is not intended to limit the present invention to the present embodiment, and the present invention can be variously modified without departing from the gist thereof.

For example, a modification of the second embodiment of the standing assist device 10A shown in fig. 15 and 16 may be performed. In addition, the same or similar components as those of the standing assist device 10 of the first embodiment are given the same reference numerals, and the description thereof is omitted.

The main differences between the standing assistance device 10A of the second embodiment and the standing assistance device 10 of the first embodiment are as follows. That is, the rise assist device 10A of the second embodiment uses the holding member 56 fixed to the coupling frame 32, and uses the gas spring 58 in which the position in the rise assist device 10A and the connection position with the link member 54 are changed.

The holding member 56 is fixed to the connecting frame 32 at a position forward of the connecting frame 32, more specifically, forward of a connecting position between the pair of link pieces of the second link 76 and the connecting frame 32.

In addition, the gas spring 58 is also disposed in a position closer to the front as a whole in accordance with the position of the holding member 56. The connection position between the gas spring 58 and the link member 54 is also changed from the link shaft 80 of the link member 54 to the first link 74. Thereby, the gas spring 58 extends obliquely rearward with respect to the connecting frame 32 in a side view at the seating position.

With this configuration, the vertical dimension of the standing assistance device 10A in the sitting position can be reduced. Therefore, when the standing assist device 10A is attached to the wheelchair 12, the standing assist device can be less susceptible to the influence of the structure below the seat surface of the wheelchair 12. Further, the standing assist device 10A is small and compact in the vertical direction (although not deformed to the storage position as in the first embodiment), and therefore is also easy to transport. Further, since the holding member 56 is fixed to the connecting frame 32, the structure of the standing assist device 10A can be simplified and the operation can be made easier than in the case where the holding member 56 is movable as in the first embodiment.

[ third embodiment of the standing-up assistance device ]

Further, for example, a modification of the third embodiment of the standing assistance device 10B shown in fig. 17 can be also performed.

As a main point of difference from the second embodiment of the standing assistance device 10A, the standing assistance device 10B of the third embodiment is provided with a position adjustment portion 56C at the other end of the pair of holding members 56. Thereby, the connection position of the gas spring 58 and the holding member 56 can be adjusted.

As shown in fig. 17, the position adjustment portion 56C is a plurality of (here, five) openings provided at the other end of the holding member 56, and one end of the gas spring 58 can be connected to any one of these openings by a fastening member or the like.

The plurality of openings are different in position in the vertical direction and the front-rear direction in the holding member 56, and the angle θ 3 between the gas spring 58 and the backseat 62 in the standing position can be adjusted depending on which opening of the position adjustment portion 56C the gas spring 58 is connected to.

For example, if the gas spring 58 is connected to the foremost opening (the front side frame 28 side) of the position adjustment portion 56C, the angle θ 3 formed between the rear seat portion 62 and the gas spring 58 is minimized. In this case, since the urging force of the gas spring 58 toward the rear seat 62 via the link member 54 is reduced, it is possible to cope with a lighter user P (for example, 40 to 50 kg).

On the other hand, as shown in the case of fig. 17, if the gas spring 58 is connected to the rearmost (rear side frame 30 side) opening of the position adjustment portion 56C, the angle θ 3 is maximized. In this case, since the urging force of the gas spring 58 toward the rear seat portion 62 via the link member 54 is increased, it is possible to cope with a user P having a heavy weight (a weight substantially doubled as compared with the case of being connected to the foremost opening in the second embodiment, for example, 80 to 100 kg).

This makes it possible to handle a plurality of users P having different weights with one gas spring 58 (there is no need to change the gas spring to a gas spring having a different acting force for each user P), and the standing assistance device 10B can be made more versatile.

The position adjusting portion 56C is not particularly limited as long as the position of connection to the gas spring 58 can be adjusted, and may be provided with, for example, one wide opening that extends in the vertical and longitudinal directions, and one end of the gas spring 58 may be fastened to one portion of the wide opening. In this case, the connecting position with the gas spring 58 can be finely adjusted steplessly.

Description of the reference numerals

10. 10A, 10B … rising assistance device, 12 … wheelchair, 13 … seat cushion, 14 … seat cushion frame, 14A … seat cushion left frame, 14B … seat cushion right frame, 16 … body frame, 18 … seat, 20 … seat movement mechanism, 22 … hinge, 24 … reverse warpage prevention member, 26 … rear seat forward tilt adjustment device, 28 … front side frame, 30 … rear side frame, 32 … connecting frame, 34 … front side engaging portion, 34A, 48a … resisting plate, 34B, 48B … hook plate, 36, 37 … frame width adjustment device, 38 … front side outer tube, 40 … front side inner tube, 42 … front side locking member, 44 … rear side outer tube, 46 … rear side inner tube, 48 … rear side engaging member, 50 … rear side locking member, 52 … space, 54 … link member, 3656 holding member, … B … holding member, … holding member, … spring …, 62 … rear seat portion, 64 … seat portion shaft supporting portion, 66 … bent portion, 68 … rotating pin, 70 … bar-shaped member, 72 … bracket, 73 … nut, 74 … first link, 76 … second link, 78 … locking mechanism, 78a … fixed table, 78B … hook, 78C … rod, 80 … link shaft, 82 … first link shaft, 84 … rotation restricting portion, 86 … second link shaft, 88 … wheelchair main body, 90, 92 … side frame, 94 … cross link, 94a … link member, 96 … rear wheel, 98 … caster, 100 … handle, 102 … armrest portion, 104 … foot pedal, 106 … back, 108 … link hole, 110 … insertion hole, 112 … bolt, P … user, M8536 intersection point …

Claims (18)

1. An uprising assistance device detachably attached to a seat frame of a wheelchair from which a seat cushion is detached, the uprising assistance device comprising:

a body frame detachably mounted on the seat frame, and having a front frame and a rear frame connected by a connecting frame and arranged in parallel;

a seat section provided in the main body frame, having a front seat section disposed on the front side frame side and a rear seat section disposed on the rear side frame side, the front seat section and the rear seat section being connected by a hinge, and a front end section of the front seat section being supported at a front end section of the main body frame so as to be vertically rotatable;

a seat moving mechanism having one end rotatably connected to the connecting frame and the other end rotatably connected to a center of a lower surface of the rear seat, the seat moving mechanism moving the seat between a seating position parallel to the main body frame and a standing position tilted forward with respect to the main body frame by applying a rotating force to the center of the lower surface of the rear seat to vertically rotate the seat;

a reverse buckling prevention device that prevents the seat from reversely buckling downward at the position of the hinge; and

a rear seat forward-tilting adjustment device having one end rotatably supported by the connecting frame and the other end rotatably supported on a rear end side of a center of a lower surface of the rear seat, for applying a resistance force against an upward rotational force of the seat to the rear end side of the rear seat when the seat is rotated from a seating position to a standing position,

the seat moving mechanism includes:

a link member, comprising: a first link having one end rotatably connected to a center of a lower surface of the rear seat portion; a second link having one end rotatably connected to the other end of the first link and the other end connected to the connecting frame;

a holding member having one end rotatably connected to a rear end side position of the connecting frame and the other end extending downward of the main body frame;

a gas spring having one end rotatably connected to the other end of the holding member and the other end rotatably connected to the link member; and

a locking mechanism that restricts movement of the link member caused by the gas spring,

in a state where the lock mechanism is released, the seat section is movable from the seating position to the standing position by an urging force of the gas spring via the link member.

2. The standing up assist device according to claim 1, wherein there are frame width adjusting means that adjust the width of the main body frame on the front side frame and the rear side frame.

3. The standing-up assist device according to claim 1, wherein the front side frame and the rear side frame have engaging members that engage with the seat frame of the wheelchair.

4. The lift-off aid of claim 1,

the rear seat forward tilting adjustment device is composed of the following components:

a first shaft support portion fixed to an upper surface of the connection frame and located closer to the front side frame than a connection portion between the second link and the connection frame;

a second shaft support portion fixed to a lower surface of the rear seat portion on a rear end side of the center of the lower surface; and

a guide bar formed in a bar shape, one end of which is pivotally supported by the first shaft support portion and the other end of which is pivotally supported by the second shaft support portion,

a four-link structure is formed in which the front seat section, the rear seat section, a connecting frame portion from a vertical rotation center of the seat section to the first shaft support section, and the guide bar are four-jointed.

5. The rise assist device according to claim 1, wherein a protrusion portion that abuts the rear seat portion when the seat portion moves from the rising position to the seating position is provided at the other end of the first link.

6. The rise aid according to any one of claims 1 to 5,

the lock mechanism has a hook which is rotatably provided on the rear side frame and restricts movement of the link member due to the urging force of the gas spring,

the hook rotates and engages with the link member when the seat portion moves from the standing position to the seating position.

7. The standing assist device according to claim 1, wherein the holding member is rotatable together with the gas spring from a position perpendicular to the connecting frame to a parallel housing position when the seat portion is at the seating position.

8. The standing assist device according to claim 6, wherein a rotation restricting portion that abuts against the hook when the holding member is rotated to the storage position to restrict rotation of the hook is provided at the one end of the holding member.

9. An uprising assistance device detachably attached to a seat frame of a wheelchair from which a seat cushion is detached, the uprising assistance device comprising:

a body frame detachably mounted on the seat frame, and having a front frame and a rear frame connected by a connecting frame and arranged in parallel;

a seat section provided in the main body frame, having a front seat section disposed on the front side frame side and a rear seat section disposed on the rear side frame side, the front seat section and the rear seat section being connected by a hinge, and a front end section of the front seat section being supported at a front end section of the main body frame so as to be vertically rotatable;

a seat moving mechanism having one end rotatably connected to the connecting frame and the other end rotatably connected to a center of a lower surface of the rear seat, the seat moving mechanism moving the seat between a seating position parallel to the main body frame and a standing position tilted forward with respect to the main body frame by applying a rotating force to the center of the lower surface of the rear seat to vertically rotate the seat;

a reverse buckling prevention device that prevents the seat from reversely buckling downward at the position of the hinge; and

a rear seat forward-tilting adjustment device having one end rotatably supported by the connecting frame and the other end rotatably supported on a rear end side of a center of a lower surface of the rear seat, for applying a resistance force against an upward rotational force of the seat to the rear end side of the rear seat when the seat is rotated from a seating position to a standing position,

the seat moving mechanism includes:

a link member, comprising: a first link having one end rotatably connected to a center of a lower surface of the rear seat portion; a second link having one end rotatably connected to the other end of the first link and the other end connected to the connecting frame;

a holding member fixed to the coupling frame on the front side frame side with respect to a connection portion between the second link and the coupling frame;

a gas spring having one end rotatably connected to an end of the holding member and the other end rotatably connected to the link member; and

a locking mechanism that restricts movement of the link member caused by the gas spring,

in a state where the lock mechanism is released, the seat section is movable from the seating position to the standing position by an urging force of the gas spring via the link member.

10. The standing up assist device according to claim 9, wherein there are frame width adjusting means that adjust the width of the main body frame on the front side frame and the rear side frame.

11. The standing-up assist device according to claim 9, wherein the front side frame and the rear side frame have engaging members that engage with the seat frame of the wheelchair.

12. The lift-off aid of claim 9,

the rear seat forward tilting adjustment device is composed of the following components:

a first shaft support portion fixed to an upper surface of the connection frame and located closer to the front side frame than a connection portion between the second link and the connection frame;

a second shaft support portion fixed to a lower surface of the rear seat portion on a rear end side of the center of the lower surface; and

a guide bar formed in a bar shape, one end of which is pivotally supported by the first shaft support portion and the other end of which is pivotally supported by the second shaft support portion,

a four-link structure is formed in which the front seat section, the rear seat section, a connecting frame portion from a vertical rotation center of the seat section to the first shaft support section, and the guide bar are four-jointed.

13. The rise assist device according to claim 9, wherein a protrusion portion that abuts the rear seat portion when the seat portion moves from the rising position to the seating position is provided at the other end of the first link.

14. The rise aid according to any one of claims 9 to 13,

the lock mechanism has a hook which is rotatably provided on the rear side frame and restricts movement of the link member due to the urging force of the gas spring,

the hook rotates and engages with the link member when the seat portion moves from the standing position to the seating position.

15. The standing assist device according to claim 9, wherein the holding member is rotatable together with the gas spring from a position perpendicular to the connecting frame to a parallel housing position when the seat portion is at the seating position.

16. The standing assist device according to claim 14, wherein a rotation restricting portion that abuts against the hook when the holding member is rotated to the storage position to restrict rotation of the hook is provided at the one end of the holding member.

17. The rise assist device according to claim 9, wherein a position adjusting portion that adjusts a connecting position with the one end of the gas spring is provided at the other end of the holding member.

18. A wheelchair in which a seat cushion on which a user sits is detachably provided on a seat frame of a wheelchair main body, wherein the rise assist device according to any one of claims 1 to 17 is attached to the seat frame from which the seat cushion is detached.

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