JP3070372U - Nursing chair - Google Patents

Abstract

(57) [Summary] [Problem] If the cushioning action when the seat descends is constant, the seat is difficult to descend when sitting down, and the usability is poor for a user with a light weight. A frame is fixed to a frame to which a leg is fixed, and the frame is held in an inclined state when there is no load through a non-powered mechanical lifting mechanism so that the frame becomes a substantially horizontal seating position when a load is applied. A nursing chair comprising: a seat supported so as to be able to move up and down; and a cushioning urging mechanism that buffers the seat when a load is applied and urges the seat when the load decreases. Has a link mechanism for supporting the seat so as to be able to move up and down, and an urging means for urging the link mechanism so as to hold the seat at a stationary position when no load is applied. The operation start position can be set steplessly.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a nursing chair capable of assisting an elderly or a physically handicapped person in sitting and standing up from a sitting state.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, as a nursing chair such as a wheelchair, for example, a chair in which a seat is vertically movably attached to assist a user's movement when sitting and standing up is known. The seat is moved up and down while maintaining an electrically horizontal state by, for example, a motor. In such an electric type, the seat can be moved up and down smoothly regardless of the weight of the user.

[0003]

[Problems to be solved by the invention]

 By the way, the above-mentioned electric nursing chair requires a power supply for a motor, and therefore, in the case of a mobile use such as a wheelchair, if a lead-type storage battery is used as the power supply, for example, the chair may be used. The overall weight has become heavier and requires a lot of effort to handle. In addition, when a lead-acid battery consumes power, it will not function as a power source unless it is recharged each time, so if it is completely discharged during use, the seat will not move up and down, making usability extremely poor. It became. Furthermore, when charging, the lead-acid battery had to be removed from the wheelchair, or the cable had to be routed from the charger to the wheelchair, which was troublesome.

In such an electric nursing chair, the seat moves up and down by electric power, so that a heavy user and a light user can move the seat up and down at the same speed. When the seat is moved up and down mechanically by using the lever, the up and down movement of the seat may change depending on the braking force of the damper for raising and lowering the seat and the weight of the user. That is, for example, in a public facility such as a hospital, when a heavy person uses a chair whose damping force is adjusted according to the average adult's weight, the damping force of the damper is weak and the seat drops suddenly. In some cases, the seat quickly rose when standing up, and did not fit the user's sense of use.

[0005] The present invention aims to solve such a problem.

[0006]

[Means for Solving the Problems]

 The present invention takes the following measures to achieve such an object. That is, in the nursing chair according to the present invention, the seat is vertically movably supported by the frame via the elevating mechanism, the cushioning urging mechanism sets the cushioning start position of the seat in a stepless manner, and the seating is determined by the difference in weight. By setting a position at which the user starts to buffer, the user can use the terminal without discomfort.

[0007]

[Embodiment of the invention]

 In the present invention, the frame is held in an inclined state when there is no load through a frame to which the legs are fixed, and a non-powered mechanical lifting mechanism, and it becomes a substantially horizontal seating position when a load is applied And a cushioning urging mechanism that urges the seat when a load is applied and reduces the load when the load is reduced. The lifting mechanism includes a link mechanism for supporting the seat so as to be able to move up and down, and biasing means for biasing the link mechanism so as to hold the seat at a stationary position when no load is applied. A nursing chair characterized in that at least the buffering operation start position can be set steplessly.

According to such a configuration, the buffering operation start position of the seat can be set according to the load applied to the seat, that is, the weight of the user. For example, if the user has a light weight, the buffering operation start position is set to the sitting position. By setting the distance close to, it is possible to easily and quickly move the seat to the seating position even with a light weight. In addition, when the user stands up from the sitting posture, that is, when the load on the seat decreases, the cushioning urging mechanism biases the seat, thereby assisting the standing operation. Therefore, when sitting and standing up, the load on the feet, especially the knees, can be reduced by the force received from the seat.

As a specific mode of the link mechanism in the lifting mechanism, a pair of first rollers that roll on the back surface of the seat, a first roller on one end and a second roller on the front inner surface of the frame at the other end are mounted. A pair of first link members, and a pair of second link members, one end of which is pivotally mounted near the front edge of the seat and the other end of which is supported by a pair of second rollers rolling on the inner side surface of the frame. And a connecting shaft for connecting the second link member, wherein the first link member and the second link member are rotatably connected at an intermediate portion thereof, and the urging means has one end connected to the connecting shaft and the other end connected to the connecting shaft. The end is composed of a hydraulic damper that is axially mounted on the frame, and the cushioning biasing mechanism includes a compression coil spring and a main body containing the compression coil spring. One end is connected to the connection shaft, and the other end is connected to the frame. Attached to the shaft and changing the body length Is used to set the buffering operation start position of the seat. With such a configuration, the structure can be simplified, and the urging force and the buffering operation start position can be easily set according to the weight of the user. Moreover, if the buffer urging means is provided with a compression coil spring, it can be manufactured at low cost.

[0010] Further, as the link mechanism, a pair of rollers rolling on the back surface of the seat, a pair of first link members having a roller mounted on one end and a second end mounted on the front rear surface of the frame, A roller is attached to one end of the first link member which is longer than one end of the first link member at a stationary position and is longer than the link member, and the other end is substantially at the center in the depth direction of the frame, and the first link member is attached to the shaft. A pair of second link members which are pivotally mounted below the other end, and a third link member which rotates the first link member and the second link member synchronously by connecting their respective intermediate portions. A biasing means including a coil spring having one end detachably attached to the frame and the other end detachably connected to the lower end of the second link member. The shock-absorbing mechanism comprises a compression coil spring and a main body containing the compression coil spring. One end is mounted on the connection shaft and the other end is mounted on the frame. It is preferable to set the buffer operation start position. With such a configuration, the lifting mechanism and the buffer urging mechanism can be simplified. In such a link mechanism, if the second link member is configured such that one end portion thereof is inclined rearward, the angle between the second link member and the seat can be reduced, and the movement when the seat starts to descend can be smoothly performed. can do. In addition, a link mechanism is configured such that one end is pivotally mounted on the front end portion of the lower surface of the seat, and the other end is rotatably mounted coaxially with the intermediate portion of the second link member, so that the seat prohibits forward inclination from the rest position. May be further provided. With this configuration, the seat does not lean forward more than the rest position, so that seating and standing can be performed safely.

In the case of the above-mentioned link mechanism, it is preferable that the seat is provided with a rail mechanism for guiding a roller on the lower surface thereof. Thus, by providing the rail mechanism, the vertical movement of the seat can be made smooth. In addition, it is preferable that the seat is provided with a plurality of circular holes having a smaller inner diameter protruding from the front surface side to the rear surface side on the seat surface. By providing a plurality of such holes, the strength of the seat surface can be made higher than the original strength of the material.

[0012] Furthermore, as the cushioning urging mechanism, a space is formed between a rod body which a lower end of the compression coil spring comes into contact with and forms a main body, and an upper end of the coil spring and an inner surface of the upper end when the seat is at a rest position. A cylindrical body having a coil spring built therein and being loosely fitted to a rod body to form a main body, and a cylindrical body upper end and a seat rear surface interposed between an upper end of the cylindrical body and a back surface of the seat. Adjusting means for adjusting the distance, the lower end of the rod body is rotatably supported on the frame, and when the seat is lowered, the coil springs are moved at different lowering positions of the seat according to the adjusting position by the adjusting means. The one that contacts the inner surface of the upper end of the cylindrical body is preferable. With such a configuration, it is possible to simplify the structure, and it is possible to manufacture a light-weight and inexpensive device.

[0013]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

A wheelchair 100 shown in FIG. 1 employs a configuration of a care chair according to the present invention in a seat portion thereof. The wheelchair 100 includes a chair body 101 functioning as a leg, and a seat 102 detachably attached to the chair body 101. The chair main body 101 may have the same configuration as that of a normal foldable wheelchair well-known in this field except for a seat portion. By folding back portion 101a made of a flexible sheet member, left and right frames 101b and 101c constituting chair body 101 can be folded so as to be in contact with each other. Each of the left and right frames 101b and 101c has a main wheel 101d and a front wheel 101e rotatably mounted thereon, and includes a footrest 101f, a brake 101g, an armrest 101h, and a handle 101k. The left and right frames 101b and 101c are provided with a mounting bracket 101m to which a nut (not shown) for mounting the seat 102 is fixed. The mounting bracket portion 101m is fixed to the inside of the front vertical pipe 101n for mounting the front wheel 101e and the inside of the rear vertical pipe 101p for mounting the main wheel 101d of each frame. The seat portion 102 is mounted by screwing a bolt to a nut from the inside of the mounting bracket portion 101m and tightening.

As shown in FIGS. 2 and 3, the seat portion 102 is connected to a frame 110 to which the chair body 101, ie, the left and right frames 101b is fixed, and to the frame 110 via a non-powered mechanical lifting mechanism 120. It is held in a rest position (shown by a solid line in Fig. 3) in an inclined state when there is no load, and can be moved up and down to a substantially horizontal seating position (shown by an imaginary line in Fig. 3) when a load is applied. And a cushioning urging mechanism 140 that buffers the seat 130 when a load is applied and urges the seat 130 when the load is reduced. In FIG. 3, the hydraulic damper 150 is not shown for clarity of the buffer urging mechanism 140.

The frame 110 has a box shape made of sheet metal without an upper surface and a lower surface, and has a bracket 110a fixed to the mounting bracket portion 101m on both sides of the front plate and the rear plate. . An elevating mechanism 120 and a buffer urging mechanism 140 are built in the frame 110, and a seating position is set on an upper surface thereof, and a seat 130 supported by the elevating mechanism 120 is arranged.

The seat 130 has a cushion member 130 a attached on its upper surface so as to cover the side surface, and guides a first roller 121 a of a link mechanism 121 constituting the elevating mechanism 120 on its back surface. Guide rail 121b is fixed. When no load is applied, the seat 130 is held at a rest position inclined at an angle such that the seat 130 touches the user immediately after the user leans down while trying to sit. In addition, in order to prevent a collision sound with the frame 110 when the seat 130 reaches the seating position and to reduce a shock at the time of seating, a cushioning material 130b made of, for example, hard rubber is provided at a corner of the rear surface of the seat 130. Is attached.

The elevating mechanism 120 includes a link mechanism 121 that supports the seat 130 so as to be able to move up and down, and a hydraulic damper that is an urging means that urges the link mechanism 121 so as to hold the seat 130 at a stationary position when there is no load. 150. The link mechanism 121 includes a pair of first rollers 121 a that rolls on the back surface of the seat 130, and a pair of first rollers 121 a with the first roller 121 a pivotally mounted on one end and the other end on the front inner surface of the frame 110. A second link member 123 supported by a pair of second rollers 121b, one end of which is axially mounted near the front edge of the seat 130 and the other end of which rolls on the inner surface of the frame 110; A link shaft 124 for linking the link members 123 is provided, and the first link member 122 and the second link member 123 are rotatably connected at an intermediate portion thereof. The hydraulic damper 150 has one end mounted on the connection shaft and the other end mounted on the frame 110. The buffer urging mechanism 140 includes a compression coil spring 141 and a main body 142 containing the compression coil spring 141. One end of the buffer urging mechanism 140 is mounted on the connecting shaft 124, and the other end is mounted on the frame 110. By changing the position, the position at which the cushion 130 starts to perform a cushioning operation is set.

The link mechanism 121 is constantly urged by the hydraulic damper 150 and holds the seat 130 at a stationary position. In this embodiment, two hydraulic dampers 150 are attached as urging means. Two first link members 122 of the link mechanism 121 are provided along the left and right side surfaces of the frame 110, and the front end thereof is rotatable by a bracket 111 fixed to the inner surface of the frame 110. A first roller 121a is rotatably attached to an end on the rear side. The first roller 121a rolls in a guide rail 121b fixed to the lower surface of the seat 130. Two second link members 123 are provided corresponding to the first link members 122, and the front ends thereof are rotatably mounted on the lower surface of the seat 130 by bolts and nuts. The second roller 121b is movably attached to the end on the rear side. The second roller 121b rolls on a guide rail 112 fixed to the left and right inner surfaces of the frame 110. The first link member 122 and the second link member 123 are rotatably connected to each other on the right side and on the left side by bolts and nuts at the front end side from the center in the longitudinal direction. I have. The second link members 123 are connected to each other by a connection shaft 130a at a position behind the connection position between the first link member 122 and the second link member 123. Further, the vicinity of the rear end of the first link member 122 is connected by a reinforcing member 122a.

The hydraulic damper 150 has a front end rotatably supported by a connecting shaft 124, and a rear end rotatably supported by a support shaft 113 fixed to a rear end of the frame 110. It is supported. The hydraulic damper 150 is disposed near the second link member 123. By changing the elasticity of the hydraulic damper 150, the hydraulic damper 150 can be easily used according to various weights of the user. .

The cushioning urging mechanism 140 includes a compression coil spring 141, a rod 142 a that a lower end of the compression coil spring 140 abuts to form a main body 142, and a compression coil spring 141 when the seat 130 is at a static position. There is a space between the upper end of 141 and the inner surface of the upper end, a compression coil spring 141 is built in, and a cylindrical body 142b which is loosely fitted to a rod 142a to form a main body 142, and an upper end of the cylindrical body 142b and a seat 130 are formed. Adjustment means is provided between the upper surface and the rear surface to adjust the distance between the upper end of the cylindrical body 142b and the rear surface of the seat 130. The rod 142a is rotatably supported at its lower end by a support shaft 113 at the rear end of the frame 110. The cylindrical body 142b having a sufficient inner diameter to accommodate the rod 142a is closed at its upper end by an upper plate 142c forming an upper inner surface, and the upper plate 142c has a male screw 143 as an adjusting means. Is provided with a female screw hole 144 for screwing. The male screw body 143 has a bracket 143a fixed to the upper end thereof, and the connection shaft 124 is inserted through a shaft hole provided in the bracket 143a so as to be rotatable. At the lower end of the rod 142a, a bracket 142d through which the support shaft 113 passes is attached.

The operation of the seat 102 in such a configuration will be described.

Since the link mechanism 121 is urged by the hydraulic damper 150, the seat section 102 attached to the chair body 101 holds the seat 130 at a stationary position. In the rest position, the buffer urging mechanism 140 has a gap S inside as shown in FIG. 4, so that the link mechanism 121 is not buffered or urged. When a load is applied to the hydraulic pump 130, the hydraulic damper 150 supports the load. When the load becomes larger than the urging force of the hydraulic damper 150, the seat 130 is moved toward the seating position by the link mechanism 121. Descends. In the link mechanism 121, the first and second rollers 121a and 121b roll rearward according to the load applied to the seat 130, and the angle formed between the first link member 122 and the second link member 123 is small. The seat 130 is guided to the seating position.

At this time, until the upper plate 142c of the cylinder 142b of the cushioning urging mechanism 140 comes into contact with the upper end of the compression coil spring 141 built in the cylinder 142b, the urging force of the hydraulic damper 150 is reduced. The seat 130 descends according to how the load is applied. That is, the first link member 122 of the link mechanism 121 rotates around the shaft attachment portion at its front end, and descends while its rear end moves to the rear of the seat 130. As a result, the connecting shaft 124 moves downward while moving backward against the urging force of the hydraulic damper 150, and compresses the buffer urging mechanism 140. Then, when the upper plate 142c contacts the upper end of the compression coil spring 141 and starts compressing the compression coil spring 141, the buffering operation by the buffer urging mechanism 140 starts. As a result, the buffering operation of the seat 130 by the buffering mechanism 140 is started, and the seat 130 descends more gradually than before, and the seat 130 is seated in a state where the compression coil spring 141 is compressed as shown in FIG. Reach the position.

In this case, according to the weight of the user, when the seat 130 is at the rest position, the cylinder 142 b is rotated with respect to the male screw 143 so that the cylinder 142 b of the buffer urging mechanism 140 and the rod By adjusting the total outer length with the 142a, that is, the main body length L, the buffering operation start position can be adjusted. In other words, the length of the gap S between the upper plate 142c of the cylindrical body 142b and the upper end of the built-in compression coil spring 141 is adjusted by adjusting the length of the portion of the male screw body 143 exposed to the outside from the cylindrical body 142b. When the length from the lower end of the rod 142a to the upper end of the cylindrical body 142b is minimized, that is, when the main body length L is minimized, the length of the gap S is minimized and maximized. In this case, the length of the gap S becomes the maximum. When the gap S 1 in the cylindrical body 142b is the minimum, the cushioning operation does not occur only for the length of the gap S after the load is applied to the seat 130, but the seat S is ready to be seated because the length of the gap S is short. Immediately after that, the buffer operation starts. For this reason, a user with a heavy weight can rest his / her weight on the seat with confidence.

On the other hand, when the length of the gap S is maximized, the buffering operation does not occur by that length. Therefore, if a weight greater than the urging force of the hydraulic damper 150 is applied to the seat 130, the seat 130 becomes It descends smoothly. Then, when the upper end of the compression coil spring 141 abuts on the upper plate 142c of the cylindrical body 142b, that is, from the vicinity of the seating position, a shock-absorbing operation occurs, and the descending speed of the seat 130 becomes slower and stable. Then, the seat 130 is lowered to the seating position. Therefore, for a user with a light weight, there is no need to intentionally put a weight on the seat 130, and the seat can be naturally lowered and seated.

As described above, by adjusting the length of the portion of the male screw body 143 exposed to the outside from the cylindrical body 142b by rotating the cylindrical body 142b, the buffering operation start position is adjusted steplessly. be able to. Further, since the cushioning urging mechanism 140 includes a compression coil spring 141 and is held in a compressed state when the seat 130 is in the seated position, the user can move to the seat 130 when standing up. When the weight of the seat 130 decreases due to a decrease in the load on the seat 130 due to a decrease in the load on the seat 130, the compression coil spring 141 urges the link mechanism 121 together with the urging force of the hydraulic damper 150, and assists the erection. In this case, the period during which the link mechanism 121 is urged is only while the compression coil spring 141 is in contact with the upper plate 142c. It assists the user in standing up to the point where is reached. Therefore, with one wheelchair 100, the lifting operation of the seat 102 can be adjusted according to the weight of the user, and the convenience can be improved.

Next, another embodiment of the present invention will be described with reference to FIGS. Since the structure of the lifting and lowering urging mechanism is the same as that of the above-described embodiment, the same reference numerals are used for the description.

The care chair 200 shown in FIG. 6 is used, for example, in a bathroom. The nursing chair 200 includes a frame 2 to which the leg 1 is fixed, and a seat 4 supported by the frame 2 via a mechanical lifting mechanism 3 so as to be vertically movable. The leg 1 is made of, for example, a pipe material having an outer diameter of 25 mm and is bent and formed in a U-shape. The leg 1 has a vertical portion 1a detachably attached to the left and right ends of a front and rear transverse member 2a at the front and rear ends of the frame 2 with bolts and nuts, respectively, and an upper end of the vertical portion 1a. And a horizontal portion 1b for connecting the horizontal portion 1b, and the horizontal portion 1b is configured to be located above the seat 4 at the stationary position SP. A corner portion where the vertical portion 1a and the horizontal portion 1b intersect has an arc shape so that there is no inconvenience when they come into contact with each other. The vertical portion 1a of the leg 1 has a lower half portion excluding the central portion when viewed from the front so as to increase stability when seated and stability when supporting the body using the horizontal portion 1b. And the upper half are open outward. A rubber foot 5 is attached to the lower end of the vertical portion 1a to prevent slippage. If the rubber feet 5 are intended to be used on the floor of a floor or a bathtub, it is desirable that the rubber feet 5 have a suction cup.

The frame 2 includes front and rear horizontal members 2a, side plates 2b connecting the horizontal members 2a, and a bottom plate 2c covering a lower portion between the side plates 2b. The transverse member 2a is made of sheet metal, and is bent so that the upper and lower edges in the longitudinal direction are bent so that the cut end face of the sheet metal material is directed in the up and down direction. A circular hole 2d having a peripheral wall portion protruding so as to be smaller is provided. The front and rear ends of the side plate 2b are fixed by welding to inside positions slightly closer to the center from the left and right ends of the horizontal member 2a. The bottom plate 2c is formed of punched metal in consideration of use in a bathroom. The bottom plate 2c is provided for protection in the event that a coil spring 6, which is a biasing means described later, comes off.

The seat 4 is made of sheet metal and is bent to have a substantially square planar shape. That is, the seat 4 is formed by bending four sides of a sheet metal to form a seat surface portion 4a and a side wall portion 4b around the seat surface portion 4a, and cut the sheet metal material in the same manner as the side plate 2b of the frame 2. The cut end face is formed so as to face inward on the lower surface of the seat 4 so as not to directly contact the cut end face. The seat surface portion 4a is formed to have a width larger than the width of the frame 2, that is, the width between the side plates 2a. Like the side plate 2b, the seat surface portion 4a also serves as reinforcement and drainage, and has an inner diameter from the front side to the back side. Circular holes 4c whose peripheral wall portions protrude so as to be smaller are provided at a predetermined pitch. In the vicinity of the front edge of the lower surface of the seat surface portion 4a, a bracket 4d for pivotally attaching a stop link member of the link mechanism 31 described later is welded. It is desirable that the height of the front end portion of the seat 4 at the rest position SP be determined in accordance with the height of the user's knee, for example, based on the average value of the knee height according to the age and gender of the user. It may be determined. In this embodiment, the rubber piece R is fixed at a position in contact with the transverse member 2a in the vicinity of the four corners on the lower surface of the side wall 4b of the seat 4. Thereby, when the seat 4 reaches the seating position TP (indicated by the imaginary line in FIG. 1), it is possible to prevent the metals from colliding with each other and generating an unpleasant sound.

A rail mechanism 7 for guiding a roller 32 of a link mechanism 31 described later is fixed to the lower surface of the seat surface portion 4a. The rail mechanism 7 includes a rail 7a composed of a pair of channel members and a reinforcing member 7b composed of an angle member for reinforcing the rail 7a from the back. Each of the rails 7a is fixed such that the inner surfaces of the angle members face each other and are located inside the inner surface of the side plate 2b of the frame 2. The reinforcing member 7b is welded so as to connect the outer surface of the rail 7a and the seat surface portion 4a.

The link mechanism 31 constituting the elevating mechanism 3 includes a pair of rollers 32 that are guided by the rail 7 a and roll on the back surface of the seat 4, and a roller 32 is axially mounted on one end and the other end is the front rear surface of the frame 2. A pair of first link members 31a are axially attached to the first link member 31a, and a roller 32 is axially attached to one end of the first link member 31a, which is longer than the first link member 31a and which is located above the axially attached one end of the first link member 31a at a stationary position. And a pair of second link members 31b pivotally mounted near the other end at a substantially central portion in the depth direction of the frame 2 and below the other end of the first link member 31a. A third link member 31c for connecting the intermediate portions of the first link member 31a and the second link member 31b and rotating in synchronization with each other; Second re A stop link member 31d is coaxially mounted on an intermediate portion of the link member 31b, and a lateral connection member 31e for connecting the first link members 31a and the second link members 31b at predetermined intervals. . The diameter of the roller 32 is set so that the roller 32 smoothly rolls in the rail 7a with respect to the width of the rail 7a, and a predetermined clearance is formed vertically.

Specifically, a pair of first link members 31a are attached corresponding to the positions of the rails 7a, and the lower ends of the first link members 31a are attached to the back surface of the front horizontal member 2a of the frame 2 via a bracket 2e. The roller 32 is rotatably supported at the upper end by a shaft. Similarly, the pair of second link members 31b rotatably support the rollers 32 at their upper ends, and have their lower ends connected by a connecting shaft 31h. , Both ends of which are supported by a support shaft 31f pivotally supported by the side plate 2b of the frame 2. A bracket 143a of a male screw body 143 of the buffer urging mechanism 140 is rotatably mounted at a substantially center of the connecting shaft 31h in the longitudinal direction. The first link member 31a and the second link member 31b are attached with a slight inclination rearward so that the seat 4 can be easily inclined rearward from the rest position SP. The second link member 31b is longer than the first link member 31a, and is mounted such that the upper end thereof is located above the first link member 31a. For this reason, the seat 4 is inclined forward by a predetermined angle with respect to the horizontal at the rest position SP. This predetermined angle may be set to an angle that does not impose a burden on the knee when sitting. In order to adjust the angle of the seat 4, the upper end portion of the second link member 31b is slightly inclined rearward from the mounting angle of the first link member 31a, and a coil spring 6 serving as an urging means to be described later. In order to adjust the pulling force, the lower end portion is bent backward from the position of the support shaft 31f.

The first link member 31a and the second link member 31b on the right side and the first link member 31a and the second link member 31b on the left side are connected by a third link member 31c. The front end of the third link member 31c is pivotally mounted at a position slightly lower than the center of the first link member 31a, and the rear end thereof is pivotally connected to a pivot 31g that connects the intermediate portions of the left and right second link members 31b. Supported. In the third link member 31c, the front end is set at a position higher than the rear end. Further, the left and right first link members 31a and the second link members 31b are connected by a horizontal connecting member 31e having both ends fixed near the upper end thereof. A stop link member 31d whose lower end is pivotally attached to the pivot 31g and whose upper end is pivotally attached to the lower surface of the front end of the seat 4 is brought into contact with the horizontal connecting member 31e so that the stop link member 31d abuts when the seat 4 is at the rest position SP. Will be arranged. When the seat 4 is at the rest position SP, the stop link member 31d prevents the link mechanism 31 from rotating further forward from that position, and the front end of the seat 4 is framed immediately before reaching the seating position TP. This is for restricting the seat 4 from tilting backward when it comes into contact with the seat 2. In addition, by adjusting and determining the length of the stop link member 31d, the inclination of the seat 4 can be adjusted. For example, if the stop link member 31d is lengthened, the inclination of the seat 4 becomes gentle.

The biasing means constituting the lifting mechanism 3 includes a coil spring 6 having one end attached to the frame 2 and the other end connected to the lower end of the second link member 31b. That is, the rear end of the coil spring 6 is formed in a ring shape and is detachably connected to the connection shaft 31h. The front end of the coil spring 6 is also formed in a ring shape like the rear end, and is connected to the lower end of the second link member 31b located below the rear end of the coil spring 6. The coil spring 6 exerts a pulling force rearward, and biases the link mechanism 31 so as to hold the seat 4 in the stationary position SP when no load, that is, weight is applied to the seat 4. .

The buffer urging mechanism 140 has one end pivotally connected to a connection shaft 31 h connecting the lower end of the second link member 31 b and the other end rotatable about a mounting shaft 2 g fixed to the front end of the frame 2. Is attached to the shaft. That is, the bracket 143a fixed to the male screw body 143 constituting the buffer urging mechanism 140 is axially attached to the connection shaft 31h, and the bracket 142d fixed to the lower end of the rod 142a is axially attached to the mounting shaft 2g.

In such a configuration, when the user puts weight on the seat 4, the link mechanism 31 tilts backward against the urging force of the coil spring 6, that is, the pulling force. That is, when the weight of the user rests on the seat 4, the first link member 31a pivots rearward about the lower end thereof. Accordingly, since the first link member 31a and the second link member 31b are connected by the third link member 31c, the second link member 31b is also synchronized with the first link member 31a, and the support shaft 31f. Rotate backward centered on. When the first link member 31a and the second link member 31b rotate, the roller 32 rolls in the rail 7a on the lower surface of the seat 4, and the seat 4 is smoothly moved according to the amount of the link mechanism 31 inclined backward. Descends. In this case, since the second link member 31b is longer than the first link member 31a, when the first link member 31a and the second link member 31b rotate synchronously, the seat 4 substantially holds the predetermined angle. It will descend in a state. The predetermined angle is maintained until the front end of the seat 4 comes into contact with the front transverse member 2a.

Here, as the seat 4 descends, the lower end of the second link member 31b moves to the front side, so that the buffer urging mechanism 140 is compressed. Similarly to the above embodiment, while the gap S inside the buffer urging mechanism 140 exists, the buffering operation by the buffer urging mechanism 140 does not occur, and when the seat 4 descends and the gap S disappears. Then, the buffering operation for the seat 4 starts. Therefore, the compression force of the compression coil spring 141 acts on the seat 4, and the seat 4 is gradually lowered from the state where the gap S exists, and is guided to the seating position stably according to the weight of the user.

When the front end of the seat 4 abuts on the front horizontal member 2a, the first link member 31a and the second link member 31b have moved to a position near horizontal (shown by imaginary lines in FIG. 5). ). In this state, the vertical distance between the center of rotation of the first link member 31a and the second link member 31b and each roller 32 is reduced, and the distance between the support shaft 31f and the stop link member 31d is reduced. The vertical distance from the front end is also small. When the weight of the seat 4 is further increased in a state where the stop link member 31d restricts the movement of the front end of the seat 4, the seat 4 moves the link mechanism 31 according to the clearance between the roller 32 and the rail 7a. It is possible to rotate backward with little rotation. By further applying weight to the seat 4 from this state, the link mechanism 31 is tilted rearward, and the seat 4 is rotated by the above-described clearance, and the seat 4 is lowered so as to be horizontal. As a result, the seat 4 pivots around its front end depending on the weight, and the rear end of the seat 4 comes into contact with the rear transverse member 2a, and the seat 4 stops at the seating position TP. . In this position, the first link member 31a and the second link member 31b stop at a position close to the horizontal, so that the first link member 31a and the second link member 31b are hardly rotated, and the biasing of the coil spring 6 is performed. The seat 4 is substantially locked to the seating position TPSP against the force.

On the other hand, when the user stands up from the seated state, the weight applied to the seat 4 decreases, and the coil spring 6 pulls the second link member 31b backward by the urging force, and rotates the second link member 31b about the support shaft 31f. Lean forward centered. In synchronization with this, the first link member 31a rotates, so that the seat 4 moves up. In this case, contrary to the downward movement, the seat 4 once rises to a position where the seat 4 is at a predetermined angle due to a decrease in the weight applied to the seat 4. Thereafter, when the weight applied to the seat 4 is further reduced, the link mechanism 31 raises the seat 4 while substantially maintaining the predetermined angle, and assists the user in standing up. In other words, the body 4 rises so as to push the body upward and forward while the seat 4 is supported around the user's buttocks and thighs. Then, when the user stands up, the weight is not applied to the seat 4. Therefore, the link mechanism 31 is further tilted forward by the urging force of the coil spring 6 and the extension force of the compression coil spring 141 of the buffer urging mechanism 140. The stop link member 31d abuts on the horizontal connecting member 31e, and the seat 4 stops at the rest position. Even in this case, since the extension force of the compression coil spring 141 does not act on the link mechanism 31 from the point in time when the gap S is generated in the buffer urging mechanism 140, the seat 4 is used immediately before the user takes the standing posture. It can be safely stood up without being over-energized.

As described above, when sitting and standing up, the seat 4 moves up and down while substantially maintaining a predetermined angle, so that the user can support the body by the urging force of the coil spring 6. become. Therefore, the user can reduce the burden on the knee by the amount of the urging force. Further, since a large number of circular holes 4c are provided in the seat 4, water does not accumulate in the seat 4, and the user can be prevented from slipping. When used in a bathtub, the circular hole 4c can reduce the buoyancy and resistance that the seat 4 receives from the hot water, and the same usability as when used in a bathroom can be obtained.

The present invention is not limited to the embodiment described above. When used in a bathtub, the portion of the leg 1 below the frame 2 may be shortened so that the user can be sufficiently soaked in the seat. In addition, a backrest may be detachably attached to the rear surface of the frame 2 so that a comfortable posture can be taken while sitting. Furthermore, the outer dimensions of the seat 4 are made larger than the outer dimensions of the frame 2 so that a finger does not enter between the seat 4 and the frame 2 when sitting with the hand on the seat 4. It is desirable.

In the above-described embodiment, the bottom plate 2 is provided on the assumption that the coil spring 6 comes off. However, in order to further enhance the safety of the coil spring 6 part, the coil spring 6 may be combined, for example. It may be housed in a resin tube. With this configuration, it is possible to prevent a finger or the like from being pinched when the coil spring 6 is extended, and it is possible to attach the coil spring 6 safely even if it comes off during use. Further, the number of coil springs 6 is not limited to two as in the above embodiment. For example, the number of coil springs 6 may be three or four. In this case, the tensile force of each coil spring 6 may be weaker than that of the above embodiment. As described above, by increasing the number of coil springs 6, the total pulling force is made equal to that of the above-described embodiment, and the number actually used according to the weight of the user and the condition of the knee is adjusted. A configuration for adjusting the urging force may be adopted.

In addition, the place of use of the nursing chair 200 of the present invention is not limited to a bathroom or a bathtub. For example, it may be used when performing rehabilitation for a person suffering from a knee joint. When used for such medical purposes, the tension of the coil spring 6 may be adjusted according to the degree of recovery of the user. If the chair body 101 is attached instead of the leg 1, it can be configured as a wheelchair.

Further, the footrest may be detachably or foldably attached to the front side of the leg 1. As the attachment position, for example, a position that is substantially intermediate between the lower end of the leg 1 and the position of the seat 4 when seated is suitable. In other words, in the case of a user who has difficulty bowing before the elderly, etc., it may not be possible to wash their toes if their feet are on the floor while washing their bodies. In such a case, by attaching the footrest to the front side of the leg 1, the foot can be set to a position where the hand can reach. Therefore, the toes can be washed by themselves without bothering the caregiver, and the users themselves can be satisfied.

In addition, the configuration of each section is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0048]

[Effect of the invention]

 As described above, according to the present invention, the cushioning operation start position of the seat can be set according to the load applied to the seat, that is, the weight of the user. By setting the position close to the position, the seat can be easily and quickly moved to the seating position even with a light weight. In addition, when the user stands up from the sitting posture, that is, when the load on the seat decreases, the cushioning urging mechanism urges the seat, thereby assisting the user in standing up. In addition, the load on the feet, especially the knees, can be reduced by the force received from the seat.

According to the second aspect of the present invention, the structure can be simplified, and the urging force and the buffering operation start position can be easily set according to the weight of the user. However, if the buffer urging means is provided with a compression coil spring, it can be manufactured at low cost.

According to the invention of claim 3, when the load is applied to the seat from the rest position, the elevating mechanism lowers the seat while holding the seat at a predetermined angle until the front end of the seat comes into contact with the frame. At the seating position, the seat is supported substantially horizontally, and when the load is gradually reduced from the seating position, the seat is raised from the state where the front end of the seat is in contact with the frame to the stationary position while substantially maintaining a predetermined angle. The seat can support the body when sitting and standing up, reducing the burden on the feet, especially the knees. In addition, the lifting mechanism can be simplified, and the weight can be reduced to an appropriate value that does not impose a burden on carrying. In addition, the link mechanism includes a roller that rolls on the back surface of the seat, first and second link members that pivotally mount the roller at one end, and a third link member that connects the first and second link members. If the biasing means is constituted by a coil spring, the lifting mechanism can be reduced in weight, and the weight of the entire chair can be easily adjusted. Therefore, a product having both stability and convenience of carrying can be manufactured.

In such a link mechanism, if the one end portion of the second link member is inclined rearward, the seat can be started to descend smoothly. For this reason, it is possible to surely prevent a situation where the seat suddenly starts to descend and the foot must be suddenly pressed.

Further, if the link mechanism is further provided with a stop link member that prohibits the seat from leaning forward from the rest position, it is possible to stand in a state where the movement of the seat is stopped when standing up. Performance can be improved.

In addition, if a rail mechanism for guiding the rollers is provided on the lower surface of the seat, the movement of the link mechanism can be made smooth. In addition, the seat can be reinforced. Similarly, the seat can be reinforced by providing the seat with a plurality of circular holes that protrude from the seat surface front side to the back surface side and have a smaller inner diameter, and exhibit the same strength as the material forming the seat. Materials that are thinner than the materials can be used. Therefore, the weight of the seat can be reduced, and the adjustment of the overall weight can be facilitated.

Furthermore, if the leg has a vertical portion and a horizontal portion, and the horizontal portion is located at the information from the seat at the rest position, the horizontal portion can be supported when sitting and standing up. And the burden on the knee can be further reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a rear perspective view of the seat of the embodiment.

FIG. 3 is a sectional view of a seat section of the embodiment.

FIG. 4 is a cross-sectional view showing a state where the seat of the buffer urging mechanism of the embodiment is at a stationary position.

FIG. 5 is a sectional view showing a state where the seat of the buffer urging mechanism of the embodiment is at a seating position.

FIG. 6 is a front perspective view showing another embodiment of the present invention.

FIG. 7 is a rear perspective view of the other embodiment.

FIG. 8 is a side view of another embodiment.

FIG. 9 is a sectional view of a seat according to another embodiment.

FIG. 10 is a sectional view of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 ... Chair main body 102 ... Seat part 110 ... Frame 120 ... Elevating mechanism 130 ... Seat 140 ... Shock urging mechanism 150 ... Hydraulic damper 1 ... Leg 2 ... Frame 3 ... Elevating mechanism 4 ... Seat 6 ... Coil spring 7 ... Rail mechanism 31: Link mechanism SP: Rest position TP: Seating position

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Kubota 2-7-1, Minamikaneda, Suita-shi, Osaka Within Kay Field Techno Co., Ltd. (72) Inventor Eiji Oka 120 of Juichi Makishimacho, Uji-shi Address Rokuki Mfg. Co., Ltd.

Claims (7)

[Utility model registration claims] 1. A frame to which legs are fixed, and a frame that is held in an inclined state when there is no load via a non-powered mechanical lifting mechanism so that the frame becomes a substantially horizontal seating position when a load is applied. A nursing chair comprising: a seat supported so as to be able to move up and down; and a buffer urging mechanism that buffers the seat when a load is applied and urges the seat when the load decreases. The mechanism includes a link mechanism that supports the seat so as to be able to move up and down, and biasing means that biases the link mechanism so as to hold the seat at a stationary position when no load is applied. A nursing chair characterized in that the buffering operation start position can be set steplessly. 2. A pair of first rollers, wherein the link mechanism rolls on the back surface of the seat, and a pair of first link members, the first roller being axially mounted on one end and the other end being axially mounted on the front inner surface of the frame. A pair of second link members, one end of which is pivotally mounted near the front edge of the seat and the other end of which is supported by a pair of second rollers rolling on the inner side surface of the frame, and a connecting shaft connecting the second link members. A first link member and a second link member are rotatably connected at an intermediate portion thereof, and the urging means has one end connected to the connection shaft and the other end connected to the frame. A damping biasing mechanism comprises a compression coil spring and a main body containing the compression coil spring.One end is mounted on the connecting shaft, and the other end is mounted on the frame. It sets the starting position of the buffer Claim 1 nursing chair wherein Rukoto. 3. A link mechanism comprising: a pair of rollers rolling on a back surface of a seat; a pair of first link members having a roller mounted on one end and the other end mounted on a front rear surface of the frame; A roller is axially attached to one end of the first link member which is longer than one end of the first link member at a stationary position and is longer than the link member, and a portion near the other end is a substantially central portion in the depth direction of the frame, and the first link member is axially attached. A third link for rotating a pair of second link members pivotally attached below the other end and the respective first and second link members by connecting their respective intermediate portions in synchronization with each other; A biasing means, one end of which is detachably attached to the frame, and the other end of which is formed of a coil spring detachably connected to the lower end of the second link member.
A compression coil spring and a main body containing the compression coil spring, one end of which is mounted on the connecting shaft and the other end of which is mounted on the frame, and which sets the buffering start position of the seat by changing the length of the main body. The chair for nursing care according to claim 1, wherein: 4. The nursing chair according to claim 3, wherein the second link member has one end portion inclined rearward. 5. The link mechanism has one end pivotally attached to the front end portion of the lower surface of the seat, the other end pivotally coaxial with the intermediate portion of the second link member, and the seat prohibits the seat from leaning forward from the rest position. The link member is further provided with a link member.
The described nursing chair. 6. The nursing chair according to claim 2, wherein the seat has a rail mechanism on its lower surface for guiding the rollers. 7. A cushioning urging mechanism has a space between a rod body which abuts a lower end of a compression coil spring and forms a main body, and a space between an upper end of the coil spring and an inner surface of the upper end when the seat is at a rest position. A cylinder body with a built-in coil spring that is loosely fitted to a rod body to form a main body, and is interposed between the upper end of the cylinder body and the back of the seat to adjust the distance between the upper end of the cylinder and the back of the seat The lower end of the rod body is rotatably supported on the frame, and when the seat is lowered, the coil spring moves at a different lowering position of the seat depending on the adjustment position by the adjusting means. 3. An abutment with the inner surface.
The nursing chair according to 3, 4, 5 or 6.