JP2004154298A - Overturning safety in reclining wheelchair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent rearward overturning by surely operating an overturning preventing device interlocked with a reclining operation in a reclining wheelchair and to reduce the weight of the wheelchair by extremely reducing the number of components comprising the overturning preventing device. <P>SOLUTION: The reclining wheelchair is provided with a seat part on a frame body having front wheels and rear wheels, and a rear part support frame attached tiltably rearward relatively to the frame body. The overturn preventing device is so formed that a support rod is rotationally and pivotally attached in an intermediate part of the rear part support frame, one end part of an operation rod having the other end part rotationally and pivotally attached to the frame body is pivoted to the intermediate part of the support rod, so that the support rod projects adjacently to the rear wheels-rearward floor surface interlocked with the rearward tilting operation of the rear part support frame. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fall prevention device for a reclining wheelchair.
[0002]
[Prior art]
Conventionally, in a reclining wheelchair, if the backrest is rotated backward from a normal sitting posture, the center of gravity may move to the rear wheel side and fall down rearward. In order to solve this, it has been proposed that the rear wheel (auxiliary wheel) moves rearward with reclining (for example, see Patent Document 1), or the seat moves forward with reclining. (For example, see Patent Document 2).
[0003]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-314450 [Patent Document 2] Japanese Patent Application Laid-Open No. 11-113667
However, the reclining wheelchair configured as described above has a drawback that the weight of the wheelchair increases due to the necessity of a large number of components and the operability deteriorates.
[0005]
[Problems to be solved by the invention]
In view of the above problems, in the present invention, in a reclining wheelchair, the fall prevention device operates reliably in conjunction with the back support frame being tilted backward by the reclining operation, thereby preventing the backward fall. It is an object to reduce the weight of a wheelchair by making the number of constituent parts extremely small.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a reclineable wheelchair having a back support frame which has a seat portion on a frame main body having a front wheel and a rear wheel and is attached to the frame main body so as to be tiltable backward. A support rod is pivotally attached to an intermediate portion of the back support frame, and the other end of an operating rod whose one end is pivotally attached to the main body frame is pivoted to an intermediate portion of the support rod. The most important feature is that the fall prevention device is configured so that the support rod projects in the vicinity of the rear wheel rear floor surface in conjunction with the rear tilting operation of the back support frame by being supported.
According to a second aspect of the present invention, in the above-mentioned overturn prevention device, a roller is pivotally attached to the end of the support rod on the floor surface installation side so as to freely roll.
[0007]
According to the first aspect of the present invention, the operating rod pivots downward by pivoting the back support frame, which is attached to the frame body of the wheelchair so as to be tiltable rearward, downward, and is pivotally attached to the operating rod and the back support frame. The support rod protrudes to the rear of the rear wheel. That is, by performing the reclining operation, the end of the support rod automatically becomes capable of supporting the back support frame on the floor surface behind the rear wheel, and the position of the center of gravity that moves relatively rearward with reclining. This makes it easy to fall backward, but has the effect of reliably preventing this. Further, the overturn prevention device is constituted by a supporting rod and an operating rod, and has an effect of providing a lightweight wheelchair with a small number of parts.
According to the second aspect of the present invention, since the support rod is provided with a rollable roller at the distal end thereof, the support rod can be moved even in a reclined state.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a fall prevention device for a reclining wheelchair according to an embodiment of the present invention will be described with reference to the drawings.
1 is an overall side sectional view of a reclining wheelchair provided with a fall prevention device according to one embodiment of the present invention, FIG. 2 is an overall rear view of the wheelchair shown in FIG. 1, and FIG. 3 is a reclining state. FIG. 4 is an overall side sectional view showing a state where the vehicle is further reclined from the state shown in FIG.
[0009]
The reclining wheelchair 2 provided with the fall prevention device 1 of the present invention is configured as follows.
3 is a frame body. The frame main body 3 has a frame pipe 4 formed substantially in an L-shape in a side view and a lower pipe 5 in the front-rear direction fixed thereto, and the front ends of the frame pipe 4 and the lower pipe 5 are vertically piped in a vertical direction. A pair of side frames 7, 7 which are connected to each other at right and left sides are disposed at substantially the same spacing as the seat width, and are connected to each other by horizontal pipes 8, 8,. Brackets 9, 9 are fixed downward to the front and rear middle portions of the upper horizontal portions of the frame pipes 4, 4, and the brackets 9, 9 are connected by a horizontal pipe 10. A spring (not shown) is stretched between the plates 11 fixed to the upper surface of the frame body 3 to form a seat for the wheelchair 2.
[0010]
Reference numeral 12 denotes a front wheel, which is rotatably supported at the lower end of the vertical pipe 6 so as to be able to turn around the axis of the vertical pipe 6.
Reference numeral 13 denotes a rear wheel, which is pivotally supported by a mounting plate 14 fixed to a lower rear portion of the side frame 7.
[0011]
Reference numeral 15 denotes a back support frame, to which an upper frame portion 15a is rotatably pivotally mounted, and a lower end portion of an intermediate frame portion 15b provided with handles 16 and 16 and an upper end portion of a lower frame portion 15c are pivotally mounted. A fixing means 17 is provided so as to be foldable, and can be fixed to the shaft attachment portion so that the intermediate frame portion 15b and the lower frame portion 15c can be fixed in one plane. Since the back support frame 15 is configured to be foldable in this manner, it is compact and convenient when stored.
[0012]
The back support frame 15 is supported via a reclining mechanism 18 at a rear portion of the frame main body 3 so as to be tiltable rearward from a standing state. More specifically, as shown in FIG. 1, the reclining mechanism 18 connects a bracket 19 projecting from the horizontal pipe 10 and a lower end of the back support frame 15 with a first link 20, and The bracket 21 fixed to a position behind the bracket 9 of the frame 7 and a bracket 15 d provided at a position slightly above the lower end of the back support frame 15 are supported by a trapezoidal four-point link mechanism connected by a second link 22. ing.
[0013]
The reclining mechanism 18 operates as follows. As shown in FIGS. 1 and 2, the reclining mechanism 18 is configured such that the distal end of the first link 20 moves substantially horizontally forward and the distal end of the second link 22 moves forward and downward. You have set a link. That is, the back support frame 15 acts on the frame body 3 so as to be tilted while being drawn downward. Conversely, when raising the back support frame 15, the back support frame 15 acts so as to rise up while extending upward with respect to the frame body 3. Therefore, the back support frame 15 follows the back of the user and reclines, which has the effect of reducing the friction between the back support frame 15 and the back.
[0014]
Reference numeral 23 denotes an expansion and contraction fixing device, which can be expanded and contracted by an appropriate operation and can be fixed at an appropriate position. In this embodiment, a gas spring is used. The telescopic fixing device 23 has one end pivotally attached to a bracket 24 projecting from the left and right intermediate portion of the horizontal pipe 8 of the frame body 3 and the other end integrally connecting the left and right first links 20. It is pivotally attached to a bracket 26 projecting from the connecting pipe 25, and the back support frame 15 is reclined by the expansion and contraction operation of the expansion and contraction fixing device 23. When the telescopic fixing device 23 is set in the fixed state, the back support frame 15 is held in the reclining state.
[0015]
Reference numeral 27 denotes a leg support frame, the upper end of which is pivotally attached to the front end of the upper horizontal portion of the side frame 7 so as to be vertically rotatable. A step member 28 is mounted on the lower end of the leg support frame 27.
[0016]
Reference numeral 29 denotes support means for the leg support frame 27. This is because the front end of the support plate 32 is pivotally connected to a bracket 31 projecting from a pipe 30 provided horizontally at the upper and lower intermediate portions of the leg support frame 27, and a through hole formed in the center of the support plate 32. A lateral support shaft 35 provided at the distal end of a bracket 34 protruding from the horizontal pipe 8 is inserted through the portion 33. The through hole 33 is integrally formed with engaging grooves 33a, 33b, 33c, 33d that are convex upward, and the support shaft 35 is engaged with any of the engaging grooves 33a, 33b, 33c, 33d. By combining, the leg support frame 27 is supported. That is, in the present embodiment, the angle of the leg support frame 27 can be adjusted in four steps.
[0017]
The support plate 32 is configured such that the upper end surface of the through hole 33 moves along the support shaft 35 by its own weight, and when the leg support frame 27 is lifted, the support shaft 39 automatically moves from the engagement groove 37a. 37b, 37c, and 37d are sequentially engaged to gradually change the support angle of the leg support frame 27. Conversely, in order to lower the original state, the handle member 36 fixed to the support plate 32 may be lifted to disengage the support shaft 335 from the engagement grooves 33a, 33b, 33c, 33d. At this time, the leg support frame 28 is in a state in which it can rotate vertically.
[0018]
Next, the overturn prevention device 1 will be described. The fall prevention device 1 has a support rod 39 rotatably connected to a bracket 38 fixed to an intermediate portion of a horizontal pipe 37 fixed to an approximately intermediate portion of the back support frame 15. I have. The support rod 39 is composed of a pipe 39c having a boss member 39a fixed to the upper end and a bracket 39b fixed to the lower end. A rotatable roller 40 is pivotally mounted on the bracket 39c. .
An operating rod 41 for projecting the support rod 39 rearward in conjunction with the reclining of the back support frame 15 is pivotally connected to the frame body 3 and the support rod 39. More specifically, the operating rod 41 is composed of a pipe 41b provided with holes 41a, 41a at both ends. One end of the operating rod 41 is rotatably connected to a bracket 42 fixed to an intermediate portion of the horizontal pipe 8. The other end is pivotally connected to a bracket 43 fixed to an intermediate portion of the support rod 39.
[0019]
According to the above-described overturn prevention device 1, the operating rod 41 rotates downward in conjunction with the back support frame 15 tilting rearward. Due to the downward rotation of the operating rod 41 and the tilting of the back support frame 15 rearward, the support rod 39 protrudes downward and downward. Note that there is a gap between the roller 40 of the support rod 39 and the floor surface from the state shown in FIG. 1 to the state shown in FIG. Is possible.
Further, when the back support frame 15 is tilted to an angle larger than that, the gap between the floor surface and the rollers 40 is reduced, and a state in which the center of gravity moved rearward due to the reclining can easily maintain a state in which the rear support frame 15 easily falls down rearward. is there.
Further, the overturn prevention device 1 has the following effects. When the gas spring of the gas spring, which is the expansion and contraction fixing means 23, uses a relatively strong gas pressure, a light operating force can be used when returning from the reclining state. There was a drawback that the front wheel side was easily lifted, making it difficult to recline. However, with the fall prevention device of the present invention, the support rod 39 projects rearward to support the floor surface, so that the front wheel side can be easily reclined without being lifted. Thereby, the person lying on the bed can be shifted laterally using a slippery cloth-like sheet or the like and put on the wheelchair, which is very convenient.
The fall prevention device 1 is mainly constituted by the support rod 39 and the operating rod 41, so that the number of parts can be reduced and a lightweight wheelchair can be provided.
[0020]
Next, a wheelchair 2 shown in FIG. 5 shows another embodiment different from the above.
In this wheelchair, without using the reclining mechanism, the back support frame 15 is directly and rotatably pivoted to the frame body 3, and the telescopic fixing means 23 is provided between the lower middle portion of the back support frame 15 and the lower front part of the frame body 3. It is connected and fixed. Other configurations are the same.
[0021]
Also in the case of the wheelchair 2, if the fall prevention device 1 is configured in the same manner as in the first embodiment, the support rod 39 operates as shown by the imaginary line in FIG. That is, even if the back support frame 15 is tilted rearward by various configurations, the support rod 39 is pivotally attached to an intermediate portion of the back support frame 15 and the operating rod 41 is provided between the support rod 39 and the frame body 3. The above effect can be obtained by pivoting.
[0022]
【The invention's effect】
As described above, the fall prevention device of the present invention is used for a reclining wheelchair, more specifically, a wheelchair having a back support frame that can be tilted rearward relative to the frame main body. The support rod protrudes rearward so as to interlock, and it is possible to sufficiently support a state in which the center of gravity that moves rearward due to reclining makes the vehicle easily fall backward, thereby improving safety.
Further, the number of parts constituting the fall prevention device is small, and a safe and lightweight wheelchair can be provided.
[Brief description of the drawings]
FIG. 1 is an overall side sectional view showing a reclining wheelchair provided with a fall prevention device according to the present invention. FIG. 2 is a rear view thereof. FIG. 3 is a side sectional view showing a state in which a back support frame is tilted rearward. FIG. 4 is a side sectional view showing a state where the apparatus is further tilted backward from the state of FIG. 3;
FIG. 5 is an overall side sectional view of a wheelchair showing a second embodiment.
DESCRIPTION OF SYMBOLS 1 Fall prevention device 2 Wheelchair 3 Frame main body 15 Back support frame 39 Support rod 40 Roller 41 Operating rod

Claims (2)

A reclining wheelchair having a seat portion on a frame main body having a front wheel and a rear wheel and having a back support frame attached to the frame main body so as to be tiltable rearward; The supporting rod is pivotally attached to the main body frame, and the other end of the operating rod pivotally attached to the main body frame at the other end is pivotally supported at an intermediate portion of the supporting rod to support the back. A fall prevention device for a reclining wheelchair, wherein a support rod is configured to protrude near the rear wheel rear floor surface in conjunction with the frame backward tilt operation. 2. The fall prevention device for a reclining wheelchair according to claim 1, wherein a roller is pivotally attached to the end of the support rod on the floor surface side.

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