JP2013198554A - Reclining type wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reclining type wheelchair having a mechanism of moving a seat surface up and down and forward and backward while keeping a roughly horizontal state in linkage with tilting of a backrest part.SOLUTION: A reclining type wheelchair includes a pair of leg frames 1-1, a seat surface frame 2-1 which can be moved up and down and moved forward and backward by an actuator for reclining, a back support frame 3-1 linked with the seat surface frame 2-1, and a step frame 4-1 turned in a vertical direction in linkage with the back support frame 3-1. The seat surface frame 2-1 is supported on the leg frames 1-1 through an up-and-down movement and forward-and-backward movement mechanism, a mechanism of moving the seat surface 2-1 up and down and forward and backward while keeping a roughly horizontal state in linkage with the back support frame 3-1 by the forward and backward movement operation of the actuator for reclining is formed, and a mechanism of turning the step frame 4-1 in the vertical direction is formed.

Description

  The present invention relates to a reclining wheelchair. More specifically, the present invention not only has a reclining mechanism in which the backrest part can be tilted backward and can be fixed at an arbitrary angle, but also secures the center of gravity when the backrest part is reclined and the user. In order to maintain a stable posture, the present invention relates to a reclining wheelchair provided with a mechanism in which a seat surface part moves up and down and moves back and forth in conjunction with tilting of a backrest part.

In general, as a reclining wheelchair, the seat back constituting the seat surface, the metal back plate constituting the backrest, the front pipe with the front wheel and the rear pipe with the rear wheel is the reclining type of the backrest of the vehicle body. Things are known.
For example, Patent Document 1 discloses a reclining wheelchair in which the backrest portion is a reclining type and the wheelchair has a function as a bed. This reclining wheelchair allows the backrest to tilt backwards, and has a mechanism that allows the rear wheels to move back and forth in conjunction with the tilting of the backrest. Not only can you sit down in a comfortable posture, but even if you tilt the backrest to a nearly horizontal state, the rear wheel moves backward, so it can be used safely as a bed type. .
Patent Document 2 discloses a wheelchair including a reclining type backrest portion and a lock device that can firmly lock a seat surface portion at an appropriate angle. This wheelchair is supported by a wheelchair body composed of a seat frame body having a back frame, a side frame, and a leg frame, and a wheel frame body that supports a front wheel and a rear wheel, so that the seat frame body can tilt. Further, there is provided a mechanism capable of locking the seat surface portion at an arbitrary angle so that the seat surface frame body tilted with respect to the wheel frame body grips any part of the shaft protruding from the seat surface frame body. It is provided.
Furthermore, Patent Document 3 discloses a wheelchair that prevents the wheelchair user from falling over by moving the center of gravity of the wheelchair user forward during reclining. This wheelchair has a backrest in a wheelchair body comprising a seat portion having a seat frame, a backrest frame attached to a rear end portion of the seat portion, and a leg portion having a leg frame disposed at a lower portion of the seat frame. The frame is supported movably in the longitudinal direction by the leg frame via the link, and the backrest frame can be tilted via the telescopic rod disposed between the link and the leg frame. In the reclining state, the frame can be expanded and contracted. The lower end of the backrest frame is moved forward by the action of the rod, so that the position of the center of gravity of the user is moved forward and the wheelchair is prevented from falling backward.

JP-A-5-305112 JP 2002-65752 A Japanese Patent Laid-Open No. 11-113967

However, the reclining wheelchair described above has the following problems.
That is, the reclining wheelchair described in Patent Document 1 has high stability because the angle of the backrest portion can be adjusted while riding on the wheelchair as described above, and the rear wheel moves back and forth in conjunction with the tilting of the backrest portion. The reclining wheelchair has the feature that it can be used as a bed when the backrest part is pushed down to the end, but when the backrest part is reclined, the rear wheel moves back and forth in conjunction with the tilting of the backrest part, so the center of gravity Although the wheelchair is prevented from falling backward even if the position changes, it is desired to lower the height of the seat surface in conjunction with the tilting of the backrest portion in order to further improve the stability. However, since this reclining wheelchair cannot reduce the height of the seating surface in conjunction with the tilting of the backrest, there is a problem that further improvement in stability cannot be expected when the backrest is reclined. It was.

  The wheelchair described in Patent Document 2 has an advantage that the seat surface portion can be firmly locked at an appropriate angle during reclining. This reclining wheelchair is also a reclining wheelchair described in Patent Document 1. In the same way as the tilting of the backrest part, the height of the seating surface cannot be lowered, so that when the backrest part is reclined, the stability cannot be further improved, and the backrest part is tilted. When reclining, the wheelchair's center of gravity moves backward because it is substantially V-shaped between the seat surface and the backrest, and if the amount of tilting movement is large, the wheelchair may fall, and the sitting posture Since it is almost V-shaped with the waist as the border, the abdomen may feel tight and painful, and the seating surface is linked to the tilt of the backrest. The stability it is not possible to lower the height is very low, there are drawbacks like.

  In the case of the wheelchair described in Patent Document 3, it is possible to prevent the vehicle from falling by moving the position of the center of gravity forward at the time of reclining. However, the reclining wheelchair is also described in Patent Document 1 described above. As in the case of a wheelchair, the height of the seat cannot be lowered in conjunction with the tilting of the backrest, so that when the backrest is reclined, further improvement in stability cannot be expected. As with the reclining wheelchair described in, when the reclining part is tilted and reclined, the center of gravity of the wheelchair moves backward and tilts because the seat becomes substantially V-shaped between the seating part and the backrest part. If the amount of movement is large, the wheelchair may fall, and the sitting posture will also be approximately V-shaped with the waist as the border, so the abdomen will feel tight and painful. May Jill, further the stability for in conjunction with the tilting inability to reduce the height of the seating surface of the backrest portion is very low, there are drawbacks like.

  The present invention solves the above-mentioned drawbacks and problems, and by providing a mechanism that moves up and down and back and forth while maintaining the seat surface substantially horizontal in conjunction with the tilting of the backrest, a wheelchair during reclining is provided. The aim of the present invention is to provide a reclining wheelchair that further improves stability and safety and that does not feel any pressure or pain in the abdomen when sitting in reclining.

A reclining wheelchair according to the present invention includes a leg portion having a pair of left and right leg frames, and a seat having a pair of left and right seating surface frames arranged above and below the leg portions so as to be moved up and down and back and forth by a reclining actuator. A backrest portion having a pair of backrest frames disposed at a rear portion of the seat portion and tilting in conjunction with the seat surface frame, and pivotally attached to a front end portion of the seat surface frame. A reclining-type wheelchair having a step portion comprising a pair of step frames that rotate in the vertical direction in conjunction with the abutment frame, wherein the leg portions are laterally connected between a pair of left and right leg frames. The upper end of four support rods which are composed of rods and wheels provided at the four corners of the leg frame, and the seat part is pivotally attached to the front and rear end parts of the leg frame so that the lower end part is pivotable in the front-rear direction. A pair of seating surface frames pivotably mounted in the front-rear direction, and the seating frame is supported on the leg frame via a lifting / lowering mechanism and the lifting / lowering mechanism. At least one reclining actuator disposed in the front-rear direction between a connecting rod horizontally provided at the front of the leg frame and a connecting rod horizontally provided at the rear of the seat frame; A pair of swing support rods pivotally attached at the center to the lower end thereof so as to be pivotable in the front-rear direction and a pair of connecting rods disposed in the rear end of the seat frame in the front-rear direction. A link plate, and the seat frame is moved up and down and moved back and forth while maintaining a substantially horizontal state by the back and forth movement of the reclining actuator, and the backrest portion has the seat frame frame. A back support frame pivotally attached to the rear end portion of the base so as to be pivotable in the front-rear direction, and the back support frame is configured to support the seat surface frame via an interlocking mechanism, The interlocking mechanism has a pair of connecting plates provided in the front-rear direction between a connecting plate projecting from a base end portion of the backrest frame and a pair of support rods pivotally attached to a substantially central portion of the leg frame. A link plate, and a mechanism for moving up and down and moving back and forth while maintaining the substantially horizontal state while interlocking with the backrest frame, and further, the step portion pivots to a substantially central portion of the leg frame. The step frame is pivoted in the vertical direction in conjunction with the backrest frame through a pair of connecting rods provided in the front-rear direction between the pair of worn support rods and the step frame. Special It is a sign.
The reclining actuator is not particularly limited, and is typically a hydraulic cylinder, an air cylinder, a gas cylinder, or the like, but an electric motor can also be used.

  In the reclining wheelchair of the present invention described above, the backrest part is maintained in its state by the reclining actuator, but the reclining method is operated by operating a lever attached to the reclining actuator so that the backrest frame is moved backward. Tilt down and fix to desired angle. Then, in conjunction with the movement of the back support frame, the seat frame constituting the seat advances and descends while maintaining the substantially horizontal state, and the height of the seat surface portion is lowered while remaining in the horizontal state. Pivots upward. On the other hand, when raising the back support frame, when the back support frame is raised again by operating the lever attached to the reclining actuator, the seat frame stays almost horizontal in conjunction with the movement. At the same time as moving backward while moving up, the step frame rotates downward. When a hydraulic cylinder is used for the reclining actuator, for example, the reclining lever operation can be easily performed manually, but the lever operation for raising the backrest frame is manually performed due to its structure. Therefore, it is preferable to operate intermittently by stepping.

  As described above, the present invention includes a mechanism for moving up and down and moving back and forth while maintaining the seat surface substantially horizontal in conjunction with the tilting of the backrest portion, thereby ensuring a center of gravity at the time of reclining. Further improvements in stability and safety can be achieved. In addition, the sitting posture at the time of reclining can take a comfortable posture without feeling any pressure or pain in the abdomen, and the step frame also rotates upwards in conjunction with the reclining motion, so both legs are extended By being able to sit in a state, there are excellent effects such as being able to take a comfortable posture without getting tired even if sitting for a long time.

It is a perspective view which shows the principal part of one Example of the reclining type wheelchair which concerns on this invention. It is a side view of a reclining type wheelchair same as the above. It is a side view which shows the reclining state of a reclining type wheelchair same as the above.

  1-3, 1 is a leg part, 2 is a seat part, 3 is a backrest part, 4 is a step part, 5 is a hydraulic cylinder for reclining, 6 is a raising type handrail.

  The leg 1 includes a pair of left and right leg frames 1-1 each having a front wheel 1-4 and a rear wheel 1-5 on the front and rear sides, and a connecting rod 1-2 arranged horizontally on the front part between the leg frames 1-1, It is comprised with the connecting rod 1-3 used also as the rear-wheel axis | shaft horizontally installed between the rear wheels 1-5 of the rear part. Needless to say, the front wheels 1-4 and the rear wheels 1-5 are each attached to a dedicated caster (no symbol).

  The seat portion 2 has a pair of left and right seating surface frames 2-1 disposed so as to be movable up and down and back and forth by a reclining hydraulic cylinder 5 disposed in the front-rear direction above the leg portion 1. The seat frame 2-1 is supported on the frame 1-1 through an elevating / lowering mechanism. The raising / lowering and back-and-forth movement mechanism of the seat surface frame 2-1 includes four (two on each side) seat surface frame support rods 2 pivotally attached to the front end portion and the rear end portion of the pair of leg frames 1-1. -4, 2-5, a pair of swing support rods 2-6 pivotally attached to the substantially central part of the leg frame, the connecting rod 1-2 laterally provided at the front end of the leg frame 1-1, and the above-mentioned It is comprised from the reclining hydraulic cylinder 5 arrange | positioned in the front-back direction between the connecting rods 2-7 installed horizontally in the rear part of the seat surface frame 2-1. The structure is such that the lower ends of the brackets 2-2 and 2-3 attached to the front end and rear end of the pair of leg frames 1-1 are pivotable in the front-rear direction by the shaft pins P1 and P2, respectively. A pair of seating surface frames 2-1 substantially correspond to the brackets 2-2 and 2-3 at the upper ends of the four seating surface frame support rods 2-4 and 2-5 that are worn. Brackets 2-8 and 2-9 attached to the places to be supported are supported by shaft pins P3 and P4 so as to be movable in the front-rear direction and the height direction in a substantially horizontal state. A pair of link plates 2- passed in the front-rear direction between a pair of swinging support rods 2-6 pivotally attached at P10 and a connecting rod 2-7 provided laterally at the rear portion of the seat frame 2-1 12 and a block attached to a substantially central portion of the connecting rod 1-2 laid horizontally at the front portion of the leg frame 1-1. The lower end of the bracket 5-2 is pivotally mounted so as to be pivotable in the vertical direction, and the telescopic rod 5-1 attaches the bracket 2-11 to the connecting rod 2-7 that is provided laterally at the rear portion of the seat frame 2-1. The reclining hydraulic cylinder 5 is pivotally attached to the reclining hydraulic cylinder 5, and the reclining hydraulic cylinder 5 moves the seat frame 2-1 back and forth in a substantially horizontal state and moves up and down. The seat portion 2 is configured by attaching, for example, a metal seat surface plate (not shown) or the like on the seat surface frame 2-1.

  The reclining hydraulic cylinder 5 has a power transmission member 5-3 connected to the lower end thereof, and a power transmission member connected to the power transmission member 5-3 and exposed to the outside through the leg frame 1-1. It is possible to use the member 5-4 and a mechanism that is actuated via the operation lever 5-5 connected to the power transmission member 5-4. That is, when the operation lever 5-5 is manually pulled up, the reclining hydraulic cylinder 5 is brought into a free state, and when the operation lever 5-5 is stopped, the backrest 3 is automatically fixed at that position. . The reclining hydraulic cylinder 5 is a system in which the expansion / contraction rod 5-1 moves forward stepwise, not steplessly. Therefore, when the backrest 3 is raised, the operation lever 5-5 is stepped on, for example. It is a system in which the operation is repeated intermittently an appropriate number of times.

  The backrest portion 3 is composed of a pair of backrest frames 3-1, which are pivotally attached to the rear end portion of the seat frame 2-1 so that the base portion thereof is pivotable in the front-rear direction by a shaft pin P5. The seat frame 2-1 moves up and down and moves back and forth while maintaining a substantially horizontal state in conjunction with the backrest frame 3-1. That is, the backrest frame 3-1 is connected to a connecting rod 2-10 that is provided horizontally between the base portions of the backrest frame 3-1 so that a connecting plate 3-2 that protrudes integrally at the base end portion of the frame is rotatable in the vertical direction. Spacer rod 3-3 horizontally provided between the connecting plates 3-2 and a spacer rod horizontally provided between a pair of swing support rods 2-6 pivotally attached to substantially the center of the leg frame 1-1. The seating surface frame 2-1 is in a substantially horizontal state in conjunction with the backrest frame 3-1, by an interlocking mechanism that is configured by a pair of link plates 3-5 that are passed in the front-rear direction between 3-4. It is designed to move up and down and back and forth while holding

  The step portion 4 is composed of a pair of step frames 4-1 which are pivoted up and down by a shaft pin P6 via a bracket 4-3 at a front end portion of the seat surface frame 2-1, and the step frame 4-1. A spacer bar 4-2 provided horizontally through a bracket 4-6 in between, and a spacer rod provided horizontally between a pair of swing support rods 2-6 pivotally attached to the substantially central portion of the leg frame 1-1. There is no mechanism in which the step frame 4-1 is rotated in the vertical direction in conjunction with the backrest frame 3-1 through a pair of connecting rods 4-4 passed in the front-rear direction between the step frame 3-4. ing. In addition, a footrest seat member 4-5 having a left and right divided structure is pivotally attached to the front end portion of the step frame 4-1.

  The flip-up type handrail 6 is mounted so as to be pivotable in the vertical direction between the backrest frame 3-1 and the seat surface frame 2-1, and its mounting structure is such that one end of the handrail 6 is vertically moved by a shaft pin P7. The lower end portion of the support pipe 6-1 pivotally attached to the other end of the handrail 6 and pivotally attached to the other end of the handrail 6 via the bracket 6-3 by the shaft pin P 9 is formed on the seat surface frame 2-2. A substantially L-shaped stopper 6 pivotally attached to the lower end portion of the support pipe 6-1 and attached to the joint protrusion 6-2 pivotally attached to the end portion of the support pipe 6-1. -4 is positioned just below the joint protrusion 6-2 to be locked (prevented), and the lock is released by moving the substantially L-shaped stopper 6-4 to the side of the joint protrusion 6-2. It has become. This flip-up handrail is known.

  In the reclining wheelchair having the above structure, in the non-reclining state, as shown in FIG. 1, the backrest frame 3-1 of the backrest portion 3 is fixed to a normal backrest angle by the reclining hydraulic cylinder 5 and is seated. The bearing surface frame 2-1 constituting the portion 2 is held in a substantially horizontal state. In this state, when the backrest 3 is tilted backward, that is, when the reclining is performed, the user or caregiver riding on the wheelchair raises the operation lever 5-5 attached to the leg frame 1-1. The backrest frame 3-1 is tilted backward while the reclining hydraulic cylinder 5 is free. At this time, the pair of link plates 3-5 and the swinging support rod 2-6 are pushed forward in conjunction with the movement of the back support frame 3-1, and the front end portion and the rear end portion of the leg frame 1-1 are pushed. The seating surface frame supporting rods 2-4 and 2-5 attached to the base plate 2 are moved forward while the shaft pins P1 and P2 are used as fulcrums, so that the seating surface frame 2-1 moves forward while maintaining a substantially horizontal state. To do. At the same time, a spacer bar 4-2 horizontally provided between the step frames 4-1 and a spacer rod 3-4 horizontally provided between a pair of swing support rods 2-6 pivotally attached to the leg frame 1-1. The step frame 4-1 is rotated upward with the shaft pin P6 as a fulcrum through a pair of connecting rods 4-4 passed in the front-rear direction. When the operation lever 5-5 is stopped, the backrest frame 3-1 is automatically fixed at that position, so that the wheelchair is in a reclining state as shown in FIG.

  At the time of reclining operation, the seat frame 2-1 moves downward while maintaining a substantially horizontal state in conjunction with the tilting of the backrest frame 3-1 of the backrest part 3, so that it is used on a wheelchair. Since the position of the center of gravity of the person moves forward, not only the wheelchair is prevented from falling backward, but also the height of the seat frame 2-1 is lowered, so that the stability and safety of the wheelchair is reduced. Is further enhanced. Furthermore, the sitting posture during reclining can be a comfortable posture without feeling any pressure or pain in the abdomen, and the step frame 4-1 also rotates upwards in conjunction with the reclining motion, so both feet The ability to sit in a stretched position allows you to relax in a comfortable posture without getting tired even if you sit on the seat for a long time.

  Next, when returning the backrest frame 3-1 from the reclining state to the original standing state, or when changing the inclination angle of the backrest frame 3-1, the caregiver is attached to the leg frame 1-1. The operation of tilting the operating lever 5-5 forward may be repeated an appropriate number of times. When the operation lever 5-5 is tilted forward, the telescopic rod 5-1 of the reclining hydraulic cylinder 5 moves forward by hydraulic pressure, and thus reverses the reclining operation, that is, via a pair of link plates 2-12. The swing support rod 2-6 is pushed rearward, and the seat frame support rods 2-4 and 2-5 attached to the front end portion and the rear end portion of the leg frame 1-1 use the shaft pins P1 and P2 as fulcrums. By turning to the rear side, the seat frame 2-1 rises while moving backward while maintaining a substantially horizontal state, and at the same time, a pair of swing support rods pivotally attached to substantially the center of the leg frame 1-1. 2-6 between the spacer rod 3-4 installed horizontally and the spacer rod 3-3 installed horizontally between the connecting plates 3-2 projecting integrally at the base end of the backrest frame 3-1. By the interlocking mechanism composed of the provided link plate 3-5, Since the frame 3-1 rotates upward with the shaft pin P5 as a fulcrum, the inclination angle of the backrest frame 3-1 can be adjusted by repeating the operation of tilting the operation lever 5-5 forward a suitable number of times, The back support frame 3-1 can be returned to the original state.

  In addition, in the reclining wheelchair of the present invention having the above-described configuration, four (two on each side) seat frame support rods 2-4 and 2-5 provided at the front end portion and the rear end portion of the leg frame 1-1 are provided. By making the length of the seat frame support rod 2-4 at the front end slightly longer than the seat frame support rod 2-5 at the rear end, that is, by making the front side longer and the rear side shorter. If the seat surface is inclined with the front end side of the frame 2-1 slightly higher than the rear end side, the user (passenger) can be prevented from shifting to the front side, and the sitting posture is more stable. The effect to make is obtained.

  The reclining wheelchair according to the present invention is provided with a mechanism for moving up and down and moving back and forth while maintaining the seat surface substantially horizontal in conjunction with the tilting of the backrest portion, so that the center of gravity at the time of reclining can be secured. In addition to being able to further improve the stability and safety of the body, the sitting posture during reclining can also take a comfortable posture without feeling any pressure or pain in the abdomen, and in conjunction with the reclining motion Because the step frame also rotates upward, it can sit with its legs extended, and it has excellent effects such as being able to take a comfortable posture without getting tired even if sitting for a long time, It is extremely practical.

DESCRIPTION OF SYMBOLS 1 Leg part 1-1 Leg frame 1-2, 1-3, 2-7, 4-4, 2-10 Connecting rod 1-4 Front wheel 1-5 Rear wheel 2 Seat part 2-1 Seat surface frame 2-2 2-3, 2-8, 2-9, 2-11, 4-3, 4-6, 5-2, 6-3 Bracket 2-4, 2-5 Seat frame support rod 2-6 Swing Support rod 2-12, 3-5 Link plate 3 Backrest portion 3-1 Back support frame 3-2 Connection plate 3-3, 3-4 Spacer rod 3-5 Link plate 4 Step portion 4-1 Step frame 4-2 Spacer bar 4-5 Footrest seat member 5 Reclining hydraulic cylinder 5-1 Telescopic rod 5-3, 5-4 Power transmission member 5-5 Operation lever 6 Raised handrail 6-1 Support pipe 6-2 Joining protrusion 6 -4 L-shaped stopper P1, P2, P3, P4, P5, P6, P7 P8, P9, P10 axis pin

Claims (1)

A leg portion having a pair of left and right leg frames; a seat portion having a pair of left and right seating surface frames disposed on the leg portion so as to be movable up and down and back and forth by a reclining actuator; and a rear portion of the seat portion. A backrest portion having a pair of backrest frames disposed and tilted in conjunction with the seat frame; and pivotally attached to a front end portion of the seat frame in a vertical direction in conjunction with the backrest frame. A reclining wheelchair having a step portion comprising a pair of rotating step frames,
The leg is composed of a front rod between a pair of left and right leg frames and a connecting rod provided horizontally at the rear and wheels provided at four corners of the leg frame,
The seat part is a pair of seating surfaces pivotally attached to upper end parts of four support rods pivotally attached to the front and rear end parts of the leg frame so that the lower end part is pivotable in the front-rear direction. The seat frame is supported on the leg frame via an elevating and moving mechanism, and the elevating and moving mechanism includes a connecting rod and a seat horizontally provided at the front of the leg frame. At least one reclining actuator disposed in the front-rear direction between the connecting rods provided laterally at the rear part of the face frame, and a lower end pivotally attached to the substantially central part of the leg frame so as to be pivotable in the front-rear direction. And a pair of link plates disposed in the front-rear direction between the pair of swing support rods and a connecting rod that is provided laterally at the rear end of the seat frame. The seat surface fl Arm is without a mechanism to lift and move back and forth while maintaining the substantially horizontal state,
The backrest portion is composed of a pair of backrest frames pivotally attached to the rear end portion of the seating surface frame so that the base portion thereof is pivotable in the front-rear direction, and the backrest is attached to the seating surface frame via an interlocking mechanism. A frame is configured to be supported, and the interlocking mechanism includes a connecting plate projecting from a base end portion of the backrest frame, and a pair of support rods pivotally attached to a substantially central portion of the leg frame. It consists of a pair of link plates provided in the front-rear direction, and there is no mechanism that moves up and down and moves back and forth while maintaining the substantially horizontal state in conjunction with the backrest frame,
Further, the step portion is linked to the backrest frame via a pair of connecting rods provided in the front-rear direction between a pair of support rods pivotally attached to a substantially central portion of the leg frame and the step frame. It became a mechanism that the step frame rotates up and down,
A reclining wheelchair characterized by that.

Images