JP2015213723A - wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheelchair which is firmly fixed to a floor, does not move carelessly when sitting on the wheelchair, can move at an appropriate speed even on a downslope, and collectively and simultaneously performs lock and unlock operations.SOLUTION: In a wheelchair 1 including a pair of rear wheels 2 of a large diameter and a pair of front wheels of double-wheel casters 3, the front wheels of the double-wheel casters are provided with a caster lock mechanism 4 for performing locking and unlocking, the rear wheels of a large diameter are provided with a tire brake mechanism 7 for pressing a portion of a tire 21 to brake the tire, and a braking adjustment brake mechanism 8 provided with an operation mechanism that can adjust the braking force of the rear wheels, one grip part 124 of a rear part of the wheelchair includes an operation part 5 for operating the cast lock mechanism, an operation part for operating a pair of tire brake mechanisms of the rear wheels, and an operation lever 51 for collectively and simultaneously operating the operation part 5 and the operation part, and the other grip part includes an operation part 88 and an operation lever 881 for operating the brake of the braking adjustment brake mechanism in an adjustable manner.

Description

  The present invention relates to a wheelchair in which a caregiver or the like can move while sitting.

Conventionally, many wheelchairs with wheels that can be moved while sitting for a person who has difficulty walking are disclosed and proposed. For example, the wheelchair disclosed in Patent Document 1 has a pair of large diameter wheels. A rear wheel and a front wheel of a pair of twin wheel casters are provided, and a brake mechanism is provided on a large-diameter rear wheel.
These wheelchairs are disclosed in which the wheel surfaces of the casters on the left and right wheels of the rear wheel are pressed by a brake member to apply a brake. With this device, the wheelchair and the walker are in a braking state when the brake lever is gripped. Usually, it is in a non-braking state. If necessary, when the brake lever is not gripped, the surface of the tire is separately pressed by the brake member and locked.

JP 2012-125545 A

By the way, the “wheelchair” disclosed in Patent Document 1 locks the large-diameter rear wheel for driving, so that the ground contact area is large and the braking force is large and the position of the rear wheel does not move. When the user gets on the wheelchair and gets off the wheelchair, the front wheel caster at the user's foot may move. However, in some cases, it was not sufficient to brake only the rear wheels.
In addition, the tire surface may be damaged by pressing the tire surface frequently, and a disc brake mechanism may be used to correct this. However, the mechanism is complicated and the production cost is high. It was.

  The problem of the present invention is that both the front and rear wheels are braked and firmly fixed to the floor, and the front wheel at the foot does not move carelessly when riding on a wheelchair, and the wheel is locked and unlocked. It is intended to provide a wheelchair that is simple in mechanism and easy to maintain, and can move at an appropriate speed even on downhill slopes, further reducing the burden on users and nurses. Thus, it is intended to provide a wheelchair that can be simultaneously locked and unlocked simultaneously.

In order to solve the above problems, the invention of claim 1 is a wheelchair provided with a pair of large-diameter rear wheels and a pair of front wheels of a twin-wheel caster,
A caster lock mechanism that locks and unlocks the front wheels of a twin-wheel caster, and a large-diameter rear wheel that presses and brakes a part of the tire, and the rear wheel can be adjusted in braking force An operation mechanism for operating the caster lock mechanism and an operation for operating the pair of tire brake mechanisms for the rear wheels. And an operation lever that operates them all at once,
The other gripping portion is provided with an operation portion and an operation lever for adjusting the braking of the braking adjustment brake mechanism in an adjustable manner.
The invention according to claim 2 is characterized in that the lock operation mechanism for the twin-wheel casters and the operation levers for operating the pair of tire brake mechanisms for the rear wheels unlock the casters and hold the rear wheel tires when the operation levers are gripped. It is characterized by releasing the press.
According to a third aspect of the present invention, in the wheelchair of the second aspect, a pair of left and right auxiliary twin-wheel casters are provided in front of and behind the large-diameter left and right rear wheels, and the auxiliary caster lock mechanism is also provided on the twin-wheel casters. The lock mechanism is characterized in that an operation lever for simultaneously operating the caster lock mechanism of the front wheels and the tire brake mechanism of the rear wheels is provided.

According to the invention of the wheelchair of claim 1, a locking mechanism that locks and unlocks the front wheel twin-wheel caster is provided, and further, a part of the tire is pressed against the large-diameter rear wheel for braking (tackle). A brake mechanism (tackle brake) is provided, and an operation part and an operation lever that operate them all at once are provided, so both the front and rear wheels are locked and firmly fixed to the floor, and the front wheel casters are also locked. As a result, the front wheels of the feet do not move carelessly when riding in a wheelchair.
Also, the caster lock mechanism that locks and unlocks the wheels is simple, and the front wheel double wheel casters and the tire pressing brakes are also provided with operation levers that lock and unlock both wheels simultaneously. The burden on the operator and nurse is reduced, the structure is simple, and maintenance is easy.
In addition, a braking adjustment brake mechanism (disc, drum, band brake) with an operating mechanism that can adjust the braking force of the rear wheels can be provided so that the rear wheels can be gradually braked. If the lock on the two-wheel caster and the tire brake mechanism side is released and the brake adjusting brake mechanism is operated, the vehicle can move at an appropriate speed.
According to the invention of the wheelchair of claim 2, the lock operation mechanism of the front wheel twin wheel caster and the operation lever of the operation part of the pair of tire brake mechanisms of the rear wheel release the lock of the caster when the operation lever is gripped. Since the rear wheel tire is released, the wheelchair is always fixed to the floor when the user does not operate anything, so the wheelchair does not move unexpectedly and is normally locked. It does not move accidentally.
According to the invention of the wheelchair of claim 3, a pair of left and right auxiliary twin-wheel casters are provided in front of and behind the large-diameter left and right rear wheels of the wheelchair of claim 2, and when all the six twin-wheel casters are stopped, all the auxiliary casters Since it is locked by the locking mechanism, it is more firmly fixed to the floor.

Example 1 of the present invention is a perspective view of the appearance of the wheelchair from the right side, FIG. 2 is an explanatory diagram of a caster operation unit 5 for operating the caster lock mechanism 4 and the tire brake mechanism 7 of Example 1 of the present invention, and FIG. 2A is an internal mechanism of an operation lever in a fixed state of the wheelchair in FIG. 2B is a cross-sectional explanatory view from the side, FIG. 2B is a cross-sectional explanatory view from the side in the middle of operating the operating lever by hand, and FIG. 2C is an operation illustrating the unlocked state by raising the operating lever. Cross-sectional explanatory drawing from the side of the internal mechanism of the lever, Overall configuration diagram of the operation transmission mechanism 4 (a) is an enlarged exploded view of one end of the lever connecting wire of FIG. 3, FIG. 4 (b) is an enlarged exploded view of the lever connecting wire of A part, FIG. 5 (a) is an enlarged exploded side view of the branch wire at B in FIG. 3, FIG. 5 (b) is an enlarged exploded view of the branch wire at the other end of FIG. Outline perspective view of twin wheel caster, FIG. 7 (a) is a front view, FIG. 7 (b) is a side view, and FIG. FIG. 8 (a) is a front perspective view of the state in which the knock member is raised and the tooth portion 442 is fitted to the internal gear 35, and FIG. 8 (b) is its knock. Side perspective view of the member, Sectional view taken along line (a)-(a) in FIG. FIG. 10 (a) is a front perspective view of the double wheel caster in the unlocked state, and FIG. 10 (b) is a side perspective view of the knock member. FIG. 10A is a plan view from above of the caster mounting bracket of FIG. A perspective view of the base portion 441 of the wheel tooth meshing lock portion 44, FIG. 13A is a front view, FIG. 13B is a side view, FIG. 13C is a top view, and FIG. Explanatory drawing of a state where the brake member is pressed against the tire of the tire brake mechanism, Explanatory drawing of the state where the brake member is separated from the tire of the tire brake mechanism, Explanatory drawing of the brake adjustment brake mechanism, The external appearance perspective view from the wheelchair right side of Example 2 of the present invention, FIG. 6 is an overall configuration diagram of an operation transmission mechanism according to a second embodiment.

  An embodiment of the wheelchair of the present invention will be described with reference to the drawings.

FIG. 1 is an external perspective view of the entire wheelchair 1 according to the first embodiment from the right side. The seat 11 that can be folded from the center is connected to the seat support frames 121 of the pair of pipe-like frames 12 on both sides. The rear end of the seat support frame 121 of the pipe-shaped frame 12 supports the back surface portion 13 by the back support frame 122, and the upper end portion 123 of the back support frame 122 is folded rearward to form a grip portion 124. ing.
A front wheel support frame 125 that is bent downward is provided in front of the seat support frame 121. The front wheel support frame 125 is provided with a front wheel twin wheel caster 3 and a footrest plate 126. A large-diameter large-diameter rear wheel 2 is disposed on both outer side portions 121 of 121.
A pair of front wheel twin-wheel casters 3 is provided with a caster lock mechanism 4 for locking and unlocking. The caster lock mechanism 4 is casted by an operation portion 5 provided in the vicinity of one gripping portion 124 of the upper end portion 123. The lock mechanism 4 and the tire brake mechanism 7 are operated, and the tire brake mechanism 7 is provided on the tire portion 21 of the pair of large-diameter rear wheels 2, and the operation is transmitted by the coaxial cable operation transmission mechanism 6. .
Further, the rotating shaft of the pair of large-diameter rear wheels 2 is provided with a brake adjusting brake mechanism 8 such as a drum, a disk, and a band brake.

  Next, these configurations and mechanisms will be specifically described in the order of the operation unit 5, the coaxial cable operation transmission mechanism 6, the caster 3 and the caster lock mechanism 4, the tire brake mechanism 7, and the brake adjustment brake mechanism 8.

[Caster lock mechanism 4 and operation part 5 of tire brake mechanism 7]
First, the detail of the operation structure of the operation part 5 which operates the caster lock mechanism 4 and the tire brake mechanism 7 is demonstrated.
FIG. 1 is an external perspective view in which the left and right twin-wheel casters 3 are locked by the operation unit 5. FIGS. 2 (a) to 2 (c) illustrate the operation unit 5 from this locked state to the unlocked state. It is a fragmentary sectional view.
First, FIGS. 2 (a) to 2 (c) show a state in which the two twin-wheel casters 3 are unlocked from the locked state, and FIGS. 2 (a) to (c) and FIG. 9, the operation unit 5 mainly includes an operation lever 51, a rotation shaft 52, a wire end (ball) locking part 53, a wire guide pulley 54, a wire covering (outer periphery) locking part 55, A rotation stopper 57, a caster lock release holding lever (not shown), and a case 58 are included.

2 (a) in the caster lock state, the operation lever 51 rotates about the rotation shaft 52, and the operation lever 51 and the wire end (ball) locking portion 53 rotate together. The stopper locking portion 511 and the lock holding locking portion 512 also rotate. Normally, the inner wire 612 of the lever connecting wire 61 (operation transmission wire 60) is always pulled by the spring force of the caster lock mechanism 4 via each branch wire 63 (FIG. 3) (FIG. 2A). On the left).
Along with this, since the end portion 611 of the inner wire 612 is locked to the wire end (ball) locking portion 53, the operating lever 51 is pulled upward obliquely after changing the pulling direction with the wire guide pulley 54. As a result, the operation lever 51 turns counterclockwise and is lowered (FIG. 2A), and is normally locked and fixed by the spring of the caster (double wheel) lock mechanism 4. .
In addition, the rotation stopper latching | locking part 511 has latched the rotation stopper 57 currently fixed to the case 58 side so that the operation lever 51 may not rotate too much.

When the nurse or patient moves in the wheelchair 1, as shown in FIG. 2 (c) and FIG. 2 (b) during the operation, the operation lever 51 is raised upward.
In FIG. 2C, when the operation lever 51 of the operation unit 5 is given, the operation lever 51 resists the spring force of the caster lock mechanism 4, and the lever connecting wire is connected to the lever connecting wire 62 and each branch wire 63. 61 is pulled upward in the figure, and the operation lever 51 is raised to the state shown in FIG. As a result, the operation lever 51 is rotated clockwise as shown in FIG. 2C, and the lock is released against the springs of the caster (double wheel) lock mechanism 4 and the tire brake mechanism 7.

  In this state, the wheelchair 1 is movable, but the operation lever 51 must be lifted by hand. Therefore, to maintain the movable state for a long time, pull the lock release holding lever (not shown). Even if the lock is locked to the lock holding lock 512 (Fig. 2c) and the hand is released, the operation lever 51 will remain in the raised position (Fig. 2c). If it returns, it will be in the original state (FIG. 2 (a)) of the operation lever 51, and may be locked and fixed by the springs of the caster (double wheel) lock mechanism 4 and the tire brake mechanism 7.

[Operation transmission mechanism 6]
Next, details of the operation structure of the operation transmission mechanism 6 will be described.
The operation transmission mechanism 6 includes the operation unit 5 from the operation unit 5 to the left and right twin-wheel casters 3 as shown by the dotted line in FIG. 1 and the solid line in FIG. 3, and as shown by the dotted line in FIG. The operation transmission wire 60 that is the coaxial wire of the operation transmission mechanism 6 is connected from the tire brake mechanism 7 of the left and right large-diameter rear wheels 2 to the left and right large-diameter rear wheels 2, and by operating the operation lever 51, The rear wheels 2 having the diameter are configured to be simultaneously locked and unlocked.
The operation transmission mechanism 6 uses a coaxial so-called lock wire composed of an inner wire that forms a core and an outer wire that is coaxial and also a covering portion. As shown in FIG. The operation transmission wire 60 includes a lever connecting wire 61 and four branch wires 63 (63a, 63b, 63c, 63d).

  As shown in FIG. 4 (b) of the enlarged view A of the end portion, the lever connecting wire 61 attached to the operation unit 5 is composed of an inner core wire 612 and a covering portion 613 that is an outer wire covering the core inner wire 612. A spherical end portion 611 is provided at the tip of the inner wire 612, a mounting fixing portion 614 is provided at the tip of the covering portion 613, and the end portion 611a is moved forward and backward with respect to the mounting fixing portion 614. The other end portion 611b (see FIG. 4A) is connected to the wire branch board 62. The end portion 611b on the opposite side of the lever connecting wire 61 is cylindrical as shown in FIG. 4A and is connected to the fitting portion 6221 (see the dotted line in FIG. 3) of the slider 622 of the wire branch board 62.

On the other hand, the slider 622 of the wire branch board 62 is provided with a fitting portion 6222 of the branch wire 63, and two of the branch wires 63 (63a, 63b) are connected to the caster (double wheel) lock mechanism 4 and the other two. The book (63c, 63d) is connected to the tire brake mechanism 7. (Figure 1)
The branch wire 63 (63a, 63b, 63c, 63db) is as shown in FIG. 5, and one of the branch wires 63 (63a, 63b, 63c, 63db) is a core inner wire as shown in FIG. 632 and a covering portion 633 that covers it, and a distal end portion 631 having an engagement hole at the center is provided at the tip of the wire 632, an attachment fixing portion 634 is provided at the tip of the covering portion 633, and the inner wire 632 The distal end portion 631 is configured to be movable back and forth with respect to the mounting fixing portion 634.
Thus, one end portion 631a is the same as the end portion 631b of the lever connecting wire 61 and has a cylindrical shape, and the caster (double wheel) lock mechanism 4 of the left and right twin wheel casters 3 (3a, 3b) and the left and right rear portions. The terminal portion 611b connected to the tire brake mechanism 7 of the wheel 2 is different only in that a fitting hole is provided for connection to the lock mechanism frame body 41, and thus other description is omitted.

In this way, the one lever connecting wire 61 is attached to the attachment fixing portion 614 of the side plate 623a, and the end portion 611b of the inner wire 612 of the lever connecting wire 61 is fitted to the fitting portion 6221 of the slider 622. Similarly, the attachment fixing portion 634 of the two branch wires 63 is also attached to the side plate 623b, and one end portion 631a of the branch wire 33 (33a, 33b) is also fitted to the fitting portion 6222.
With this configuration, when the end portion 611b of the lever connecting wire 61 is pulled, the slider 622 moves to the side plate 623a side (FIG. 8: right direction). The part 631a also moves away from the side plate 623b at once (FIG. 3: right direction).

  In this way, the forward / backward movement of the lever connecting wire 61 is transmitted to the two branch wires 63 via the wire branch board 62. In addition, since coaxial wires are used for operation transmission, the positions of the left and right twin-wheel casters 3 (3a, 3b) can be freely set on the lower surface of the pipe-shaped frame 12 of the wheelchair 1. Unlike the grounding member for floating the whole, the structure is simple, the manufacturing cost is low, and maintenance is easy. Furthermore, since the lever connecting wire 61 is basically branched from one to two branch wires 63 (63a, 63b), it has two casters and two large diameters in a very simple configuration. The wheel can be locked and unlocked accurately at the same time.

[Caster 3 and Caster Lock Mechanism 4]
Next, details of the operation structure of the caster 3 and the caster lock mechanism 4 will be described.
(Arrangement of twin wheel casters)
The above-described branch wire 63 is attached with the above-described pair of front wheel twin wheel casters 3 (3a, 3b). The outline of the appearance of these twin wheel casters 3 is as shown in FIG. Although details will be described later, a pair of wheels 31A and 31B are rotatably supported on both sides of a lock mechanism frame 41 of a caster (double wheel) lock mechanism 4 which is a caster operating mechanism, and the lock mechanism frame 41 On the upper surface, there is provided a turning support portion 42 for pivotally supporting the caster 3 with respect to the mounting frame, and a knock member 431 that moves up and down coaxially with the axis X of the turning support portion 42 is provided. When the knock member 431 is pushed up by the pressing spring 443, the twin-wheel caster 3 is locked and the wheel portion 31 cannot rotate. On the contrary, when the knock member 431 is lifted up and released downward, the tooth portion 442 to the internal gear 35 of the double wheel caster 3 is released, the lock is released, and the twin wheel can freely rotate.
By the way, the twin-wheel casters 3 (3a, 3b) used in the first embodiment are more stable than the single-wheel casters because the width of the twin wheels is wider than that of the single-wheel casters. Not only the direction of travel but also the width of the twin wheels is wide so that turning can be prevented.

(Caster wheel)
The wheel portion 31 of the above-described twin wheel caster 3 will be described. As shown in FIG. 6, one wheel portion 31 (31A, 31B: wheel) is arranged on each side of each of the two twin wheel casters 3. As shown in FIG. 7, the wheel shaft 32 is rotatably supported by a wheel bearing portion 411 of a caster (double wheel) lock mechanism 4 (see FIG. 8). The wheel shaft fixing portion 33 is pivotally supported (the wheel shaft fixing portion 33 may be configured to rotatably support the wheel). The outer ring 34 of the wheel portion 31 is made of rubber and absorbs vibrations, smoothes running, reduces noise, and strengthens the grip to the floor.
Further, an inner gear 35 coaxial with the wheel shaft 32 is formed in the vicinity of the outer ring 34 inside the wheel portion 31 of the twin wheel caster 3, and when a lock tooth portion 442 (described later) is lifted by the pressing spring 443, The tooth portion 442 meshes with the gear 35 to prevent the wheel portion 31 from rotating.

(Caster wheel lock mechanism)
As described in FIG. 6, the caster of the first embodiment is a twin-wheel caster 3 of wheels 31 </ b> A and 31 </ b> B having a predetermined interval across the lock mechanism frame 41 of the caster (double-wheel) lock mechanism 4. When traveling, it is more stable in running than a single wheel caster. Further, when both wheels (double wheels) of the wheel portion 31 (31A, 31B) are locked, the vehicle cannot run and the turning of the caster is restricted. Further, as in the first embodiment, the double wheel casters 3a on both sides of the wheelchair 1 are used. , 3b is fixed, it is found that the wheelchair 1 is almost completely fixed only by fixing the rotation of the wheel without fixing the turning of the two-wheel caster 3 itself. is there.

First, the caster (double wheel) lock mechanism 4 of the double wheel caster 3 (3a, 3b) disposed on the back surface of the wheelchair 1 will be described in more detail with reference to FIGS.
FIG. 8 is a view of a caster locked state, in which the knock member 431 is loosened by the branch wire 63, the slider cam 46 is moved to the left side by the coil spring 467, and the knock portion 43 is raised upward. FIG. 11 (a) is a transverse sectional view of the caster (double wheel) lock mechanism 4, and FIG. 8 (b) is a side sectional view of FIG. 8 (a). FIG. 9 is a cross-sectional view taken along the line aa in FIG. 8A, and shows a state in which the tooth portion 442 is fitted and locked to the internal gear 35 of the twin wheel caster 3.
FIG. 10 is a diagram of the unlocked state of the twin-wheel caster 3 with the tooth portion 442 separated from the internal gear 35. The knock member 431 is pulled by the branch wire 63, and the slider cam 46 resists the tensile force of the coil spring 467. Is a view in a state where the tooth portion 442 is lowered against the pressing spring 443 in the caster, that is, a state in which the caster is unlocked.

  8 (a) and 8 (b) are diagrams showing the normal state of the wheelchair 1, that is, the state in which the operation lever 51 is lowered in FIG. In the frame body 41, a turning support portion 42 is pivotally supported so that the two-wheel caster 3 can turn with respect to the caster mounting bracket 45, and a knock portion 43 that moves up and down inside the turning support portion 42 is provided. Following the portion 43, a wheel tooth meshing lock portion 44 is connected via a pressing spring 443. In the state where the tooth portion 442 is raised by the pressing force of the pressing spring 443 by the cam surface 461 of the slider cam 46 that moves the knock member 431 up and down, the wheel tooth meshing lock portion 44 also has the tooth portion 442 The tooth portion 442 is engaged with the internal gear 35 inside the wheel portion 31 to prevent the wheels 31A and 31B from rotating, and the two-wheel caster 3 is locked.

Here, the configuration of each part will be described in more detail. First, the lock mechanism frame 41 is made of plastic, and as shown in FIG. A cylindrical fitting portion 412 for inserting the turning support portion 42 (knock portion 43) and a storage portion 413 are disposed on the left side of the two wheels, and the portion of the fitting portion 412 adjacent to the caster mounting bracket 45 is of the twin-wheel caster 3. A protruding wheel 414 is provided to make the turning smooth, and a storage portion 415 for storing a wheel tooth meshing lock portion 44 that moves up and down and a pressing spring 443 is disposed above the wheel bearing portion 411. The fitting part 412 of the twin-wheel caster 3 including the storage part 415 and the turning support part 42 are firmly supported in a freely rotatable manner, but the turning support part 42 is firmly fixed to the caster mounting bracket 45 side.
The storage part 413 has an opening on the lower side and one side (if necessary, a dust cover may be provided), which is fixed to the caster mounting bracket 45 during assembly work. When the turning support washer 423 and the stopper (fixed snap ring) 424 are attached to the fitting portion 412 so that the turning support portion 42 can be turned freely.
After inserting the turning support part 42 into the fitting part 412, a turning auxiliary washer 423 is inserted into the lower end of the turning support part 42, and a stopper (fixed snap ring) 424 provided at the lower end of the turning support part 42 is inserted. The snap ring 424 is locked to the fixed circumferential groove 425 for the snap ring so as to fix the turning support portion 42 so that the lock mechanism frame 41 does not fall out of the turning support portion 42.

  Further, a base portion 441 of the wheel tooth meshing lock portion 44 is attached to the lower end portion of the knock member 431 of the knock portion 43, and this base portion 441 is shown in FIG. It is composed of a lower horizontal portion 4411, an upper horizontal portion 4412, and a connecting portion 4413 that connects the lower horizontal portion 4411 and the upper surface of the lower horizontal portion 4411 is the lower tip of the knock member 431. The upper horizontal portion 4412 is engaged with the upper end portion of the spring 443 that is pressed to expand outwardly, with the tooth portion 442 fixed thereto, having a pressure receiving portion that is pressed by 433 or released (released in FIG. 10). An upper spring engaging portion 444 is provided. The lower end portion of the pressing spring 443 is engaged with the lower spring engaging portion 445 provided on the lock mechanism frame body 41 side, and the upper spring engaging portion 444 on the lower surface of the upper horizontal portion 4412 is always pressed upward. Yes.

(Swivel support part and knock part)
Next, the fitting part 412, the turning support part 42, and the knock member 431 in FIG. 8 will be described.
The fixed support cylinder member 421 of the turning support portion 42 is a metal cylinder (pipe), and its upper end is fixed to the bottom plate 454 of the metal caster mounting bracket 45 by welding or the like. Here, as shown in FIG. 6, the turning of the twin wheel caster 3 means that the vertical line of the ground contact point X2 of the normal twin wheel caster 3 and the ground contact point X1 of the shaft center of the knock member 431 are eccentric. When the wheelchair 1 is moved, the traveling direction of the two-wheel caster 3 is automatically set to the moving direction. Naturally, when the two-wheel caster 3 is in the locked state, the two-wheel caster 3 does not turn. On the contrary, if the wheelchair 1 is not in a locked state when it is moved, it must be freely turned. Therefore, a protruding wheel 414 is interposed between the turning support portion 42 and the bottom plate 454 of the caster mounting bracket 45 so that the turning on the upper surface of the lock mechanism frame 41 is smooth.
The swivel support portion 42 constitutes the swivel shaft of the caster and fits and stores the knock member 431. The knock portion 43 can be moved up and down freely by the concentric fitting portion 412 of the swivel support portion 42. It is mated.

(Wheel tooth meshing lock 44)
As shown in FIG. 10, the base portion 441 has a U-shaped cross section of the base portion 441 (from the opposite side, an inverted U-shape) on the lower surface of the upper horizontal portion 4412 (in FIG. 8), An upper spring engaging portion 444 for locking the upper end of the pressing spring 443 is provided, and a pair of two tooth portions 442a on the left and right sides so as to be fitted to the internal gears 35 of the pair of wheel portions 31 of the twin-wheel caster 3. , b are fixed, and are always pushed upward by a pressing spring 443 that presses outward.
Therefore, as shown in FIGS. 7 and 8, the tooth portions 442 a and b of the wheel tooth meshing locking portion 44 are always pushed upward by the pressing spring 443 and lifted unless the knock member 431 is restricted. In the normal case where the wheelchair 1 is installed in the vicinity of the bed, the tooth portions 442a and b are engaged with the internal gear 35 of each twin wheel caster 3 by the pressing spring 443 to prevent the rotation of the twin wheel caster 3 and lock it. The wheelchair 1 cannot be moved.
Note that the vertical movement of the wheel tooth meshing lock portion 44 is lowered and raised along the side wall of the guide groove 416 of the storage portion 415 of the wheel tooth meshing lock portion 44 provided in the lock mechanism frame 41.
Further, a concentric internal gear 35 is formed on the wheel shaft 32 in the vicinity of the outer ring 34 on the inner side of the wheel portion 31 of the twin-wheel caster 3. When the tooth portions 442a and b rise, the tooth portion 442 Prevents the wheel 31 from rotating.

(Caster mounting bracket and slider cam)
The slider cam 46 for operating the caster mounting bracket 45 and the knock member 431 in FIGS. 10 to 13 will be described.
By operating the operation lever 51 (see FIG. 2) of the operation unit 5 upward, the lever connecting wire 61 is pulled, and the two branch wires 63 on the lock mechanism 4 side of the caster are also pulled by the wire branch board 62. Furthermore, the inner wire 632 of each of the branch wires 63a and 63b is pulled, but this is converted to the movement of the knock part 43 by the slider cam 46 having a slider-like cam mechanism attached to the caster mounting bracket 45. is there.
As shown in FIG. 13, the slider cam 46 is mainly provided with a cam surface 461 whose flat shape is flat and whose lower surface is inclined. At one end in the direction in which the slider cam 46 moves, the end portion 431 of the branch wire 43 is provided. Are attached to the front plate 451 (see FIG. 11) of the caster mounting bracket 45, and pulled by the lever connecting wire 61 and the branch wire 61 (63a, 63b: see FIGS. 8 and 13). As a result, the entire body is moved horizontally. As shown in FIGS. 10, 11, and 13, a guide elongated hole 464 is provided in the center portion in parallel with the horizontal upper surface 463 of the slider cam 46, and both side plates of the caster mounting bracket 45 are provided in the guide elongated hole 464. A guide shaft 465 fixed to 452 is fitted.

  One end of the coil spring 467 in the contracting direction is locked to the locking portion 466 opposite to the locking portion 462, and the other end of the coil spring 467 is locked to the locking portion 468 of the back plate 453 of the caster mounting bracket 45. The coil spring 467 returns the slider cam 46 to the position shown in FIG. 9 when the lever connecting wire 61 and the branch wire 63 are relaxed. Further, as shown in FIG. 11, the axis of the guide shaft 465 intersects with the axis of the upper tip 432 of the knock member 431. In FIG. 11, both side plates 452 of the caster mounting bracket 45 are provided with frame body mounting portions 455, and bolts (not shown) or the like are inserted into and secured to the pipe-shaped frame body 12 through bolt holes 456.

Therefore, the upper end 432 of the knock member 431 comes into contact with the cam surface 461 of the slider cam 46. However, in the unlocked state in which the branch wire 63 is pulled, as shown in FIGS. Since the cam surface 461 moves from the left side to the right side, the cam surface 461 is at the lowest point 4611 which is the lowest position, and the knock member 431 is pushed downward.
On the contrary, as shown in FIGS. 8 and 9, when the lever connecting wire 61 and the branch wire 63 are relaxed, the slider cam 46 is moved to the left side by the coil spring 467 as shown in FIGS. The cam surface 461 is at the highest point 4612 which is the highest position, and by the action of the pressing spring 443 of the tooth portion 442, the upper end portion 432 of the knock member 431 is also lifted, and the tooth portion 442 is also lifted. The two-wheel caster 3 is maintained in a locked state by fitting with the internal gear 35 of the caster 3.
This flat slider cam 46 operates so that the uppermost point 4612 moves from the lowermost point 4611 of the cam surface 461 to the upper tip 432 of the knock member 431, but the end 631 of the branch wire 63 of the slider cam 46 The moving distance Z (see FIG. 8) is substantially the same as the distance Y (see FIG. 13) from the lowest point 4611 to the highest point 4612 of the cam surface 461.
Accordingly, the distance from the lowest point 4611 to the highest point 4612 can be changed by the inclination angle of the cam surface 461, so that the height of the caster mounting bracket 45 is kept low and the distance (stroke) of the branch wire 63 is adjusted. Can do.

(Caster lock / unlock operation)
Since the terminal operation device for fixing the wheelchair 1 according to the present embodiment has the above-described configuration, it generally operates as follows.
As shown in FIG. 1, the unlocking operation lever 51 (used for lifting the table) of the caster 3 provided in the wheelchair 1 is locked when the caster 3 is locked in a normal installation state. The operation lever 51 for maintaining the release is lifted upward, and the caster 3 is unlocked.
In order to bring the caster 3 of the wheelchair 1 into the original locked state, when the operation lever 51 is released from the hand, the operation lever 51 is naturally moved by the spring of the pulling force of the wire by the caster (double wheel) lock mechanism 4 in the caster 3. As the vehicle descends, the twin-wheel caster 3 is locked.

[Lock state of twin wheel caster]
The locked state of the twin wheel caster 3 is as shown in FIG.
In a normal state in which the wheelchair 1 is disposed at a proper place in the hospital room or near the bed, the operation lever 51 is automatically positioned below (see FIG. 2).
As a result, the branch wire 63 has the tooth portion 442 fitted to the caster internal gear 35 by the press spring 443 in the caster, the knock member 431 is also on the press spring 443, and the branch wire 63 is also in a relaxed state. Although the state in this case lasts for a long time, it is not necessary for the operating lever 51 to always keep the lever connecting wire 61 pulled, so that each wire is not in a tensioned state (relaxed state), and the wire is likely to stretch over time. This makes it easy to maintain the device.
[Unlocking condition of twin wheel caster]
The unlocked state of the twin-wheel caster 3 is as shown in FIG.
In this case, in the state where the wheelchair 1 is moved, the operation lever 51 is raised, the lever connecting wire 61 is pulled up to be in a tensioned state, and the knock member 431 is pushed downward by the branch wire 63, resulting in the inside of the caster. The tooth portion 442 is released from the internal gear 35 of the caster against the pressing spring 443. Therefore, when the operation lever 51 is raised, the two-wheel caster 3 is in an unlocked state, and the wheelchair 1 is movable.

[Tire brake mechanism 7]
Next, the details of the operation structure of the tire brake mechanism 7 will be described.
(Arrangement of rear wheel 2)
The aforementioned branch wire 63 is attached to the tire brake mechanism 7 of the tire portion 21 of the pair of rear wheels 2 of the rear wheel 2 described above, and the outline of the appearance of these tire brake mechanisms 7 is as shown in FIGS. The brake member 74 is pressed against the tire portion 21 to brake the rotation of the rear wheel 2. Here, the branch wire 63 (63 c, 63 d), the tire brake mechanism 7, and the tire portion 21 of the rear wheel 2 are braked. Will be described.
As shown in FIGS. 14 and 15, the mounting frame 71 of the tire brake mechanism 7 is fixed at an appropriate position on the pipe-shaped frame 12 (see FIG. 1) so that the brake member 74 can be pressed against the tire portion 21. The branch wire 63 (63c, 63d) is attached.
The branch wire 63 (63c, 63d) and the covering portion (outer wire) 633 are fixed to the mounting fixing portion 711, and the inner wire 632 is attached to the locking portion 721 at one end of the slide member 72. The entire shape of the slide member 72 is flat and is moved horizontally as a whole by being pulled by the lever connecting wire 61 (see FIGS. 3 and 4) and the branch wire 63 (63c, 63d). A guide elongated hole 722 is provided in the central portion in parallel with the moving direction, and a fixed guide shaft 723 is fitted in the guide elongated hole 722.

One end of the coil spring 725 in the contracting direction is locked to the locking portion 724 opposite to the locking portion 721 of the slide member 72, and the other end of the coil spring 725 is the locking portion 713 of the back plate 712 of the mounting frame 71. The coil spring 725 returns the slide member 72 to the position shown in FIG. 14 when the lever connecting wire 61 and the branch wire 63 are relaxed. Conversely, the coil spring 725 is in the position shown in FIG. 15 when pulled by the lever connecting wire 61 and the branch wire 63 (63c, 63d).
At an appropriate position of the slide member 72, an end 7311 of one internal rotation arm portion 731 of the rotation member 73 is supported so as to be rotatable and somewhat slidable, but the rotation member 73 is bent. It is L-shaped and a rotation shaft 732 is provided at an appropriate position on the pipe-shaped frame 12 (see FIG. 1), and a brake member 74 is fixed to the end portion 7331 of the other external rotation arm portion 733.

Therefore, when the operation lever 51 is not operated, that is, in a normal state where the operation lever 51 is left, the lever connecting wire 61 and the branch wire 63 are relaxed by the coil spring 725, and the slide member 72 is moved downward in FIG. As the slide member 72 moves, the rotating member 73 rotates clockwise in FIG. 14, and as a result, the brake member 74 provided at the end portion 7331 of the external rotating arm portion 733 is placed on the surface of the tire portion 21. The rear wheel 2 is locked by being pressed.
On the contrary, when the operation lever 51 is operated and the gripping portion 124 is raised, the lever connecting wire 61 and the branch wire 63 are pulled against the contraction force of the coil spring 725, and the slide member 72 is shown in FIG. As the slide member 72 moves, the rotating member 73 rotates counterclockwise in FIG. 15, and as a result, the brake member 74 provided at the end portion 7331 of the external rotating arm portion 733 becomes a tire. It will be in the state separated from the surface of the part 21, and the lock | rock of the rear wheel 2 will be cancelled | released.

  Therefore, as described above, when the user raises the operation lever 51, the twin-wheel caster 3 is in the unlocked state, the wheelchair 1 becomes movable, and at the same time, the brake member 74 of the tire brake mechanism 7 Since the rear wheel 2 is unlocked and the wheelchair 1 can be moved away from the surface, the front wheel twin wheel caster 3 and the rear wheel 2 of the large-diameter tire can also rotate. As a whole, the wheelchair 1 is movable.

[Brake adjustment brake mechanism 8]
Next, the braking adjustment brake mechanism 8 attached to the rear wheel 2 will be described.
A brake adjusting brake mechanism provided with an operation mechanism for adjusting the braking force of the rear wheels is provided. As the brake adjusting brake mechanism 8, there are a disc brake, a drum brake, a band brake, and the like. If the 7-side lock is released to allow movement, the downhill slope may be dangerous because the speed is too high.
In this embodiment, a brake adjustment brake mechanism provided with an operation mechanism that can adjust the braking force of the rear wheel is adopted, and the rear wheel can be gradually operated to be braked. If the adjustment brake mechanism 8 is operated, it can move at an appropriate speed.
Here, the mechanism of the brake adjusting brake mechanism 8 will be described in detail. A known drum brake may be used, and as shown in FIG. 16, the brake frame 81 has one axle of the rear wheels 2a and 2b (FIG. 1). 22 is provided with a brake drum 82, a brake band 83 is provided so as to wrap around the brake drum 82, one end 831 of the brake band 83 is fixed at a suitable position of the brake frame 81, and the other end 832 is a free end, The braking force is adjusted by tightening the other end 832. The other end 832 of the brake band 83 for tightening the brake drum 82 is provided with a rotating member 84 that rotates about a rotating shaft 841, and the end portion 8421 of one rotating arm 842 of the rotating member 84. Engage with.

Engaging portions 8431 and 8432 are provided at appropriate positions of the other rotating arm 843 of the rotating member 84, and one end of a contraction type coil spring 85 is engaged with the engaging portion 8431, and the other end of the coil spring 85 is connected. The brake wire 81 is attached to an appropriate position of the brake frame 81, the inner wire 8611 of the branch wire 861 a of the coaxial operation transmission wire 86 is connected to the engaging portion 8432, and the covering portion (outer wire) 8612 is engaged with the appropriate position of the brake frame 81. .
The operation transmission wire 86 is provided on one gripping part 124 (FIG. 1) and grips and operates the rear wheel operation part 88 and the operation lever 881, and operates to pull out the inner wire 8621 of the lever connecting wire 862, The covering portion (outer wire) 8622 is fixed at an appropriate position of the gripping portion 124, and this lever connecting wire 862 is connected to a branching device 87 (substantially similar to the branching plate 62) that branches into two to connect two branches. The wire 861 (861a, 861b) branches, and one of the branch wires 861a is connected to the rotating member 84 of one rear wheel 2a as described above. Further, the other branch wire 861b is connected to the turning member 84 of the other rear wheel 2b and performs the same operation with the same configuration.
Since this braking adjustment brake mechanism 8 is configured as described above, the braking force of the rear wheel can be adjusted by adjusting the degree to which the operation lever 881 is gripped, and the rear wheel can be operated to be gradually braked. Even on a downhill slope, the wheelchair can be moved at an appropriate speed by operating the operation lever 881 of the brake adjustment brake mechanism 8.

As described above, a lock mechanism that locks and unlocks the front wheel twin wheel caster is provided, and a tire brake mechanism (tackle brake) that presses and brakes part of the tire is also provided on the large-diameter rear wheel. Because the operation part and the operation lever that operate these at once are provided, both the front and rear wheels are locked and firmly fixed on the floor, and the casters of the front wheels are also locked, so when riding on a wheelchair The front wheels will not move carelessly.
Also, the caster lock mechanism that locks and unlocks the wheels is simple, and the front wheel double wheel casters and the tire pressing brakes are also provided with operation levers that lock and unlock both wheels simultaneously. The burden on the operator and nurse is reduced, the structure is simple, and maintenance is easy.

The lock operation mechanism of the front wheel twin wheel caster and the operation lever of the operation unit of the pair of tire brake mechanisms of the rear wheel release the caster lock and release the rear wheel tire when the operation lever is gripped, When the user does not operate anything, the wheelchair is always fixed to the floor, so that the wheelchair does not move unexpectedly and is normally locked and does not move accidentally.
In addition, a braking adjustment brake mechanism (disc, drum, band brake) with an operating mechanism that can adjust the braking force of the rear wheels can be provided so that the rear wheels can be gradually braked. If the lock on the two-wheel caster and the tire brake mechanism side is released and the brake adjusting brake mechanism is operated, the vehicle can move at an appropriate speed.

FIG. 17 is an external perspective view of the entire wheelchair 1 according to the second embodiment from the right side. FIG. 18 is a view showing six auxiliary caster lock mechanisms 4 ′, 4 ″ of two twin-wheel casters and two tire portions 21. FIG. 3 is an overall configuration diagram of an operation transmission mechanism of a brake mechanism 7.
The wheelchair 1 according to the second embodiment basically has the same configuration as the wheelchair 1 according to the first embodiment, except that the left and right rear wheels 2 (2a, 2b) having a large diameter are paired with a pair of left and right auxiliary wheels. A twin wheel caster 9 (91a, 91b, 92a, 92b) is provided, and an intermediate auxiliary twin wheel caster 91 (91a, 91b) of the auxiliary twin wheel caster 9 is provided with an auxiliary caster lock mechanism 4 'and a rear wheel auxiliary twin wheel caster 92. (92a, 92b) is provided with an auxiliary caster lock mechanism 4 ″, and these auxiliary caster lock mechanisms 4 ′, 4 ″ are the caster lock mechanism 4 of the front wheel 3 (3a, 3b) and the rear wheel 2 (2a, 2b). ) Is operated by an operation lever 51 that is operated simultaneously with the tire brake mechanism 7. Accordingly, all the six twin wheel casters are locked by the auxiliary caster lock mechanism when stopped, so that they are more firmly fixed to the floor.
The configuration of the auxiliary caster lock mechanisms 4 ′, 4 ″ may be the same as the caster lock mechanism 4 of the front wheels 3 (3a, 3b).
Since the configuration other than the configuration related to the left and right auxiliary twin-wheel casters 9 is the same as that of the first embodiment, the description of the same configuration is omitted.

The overall configuration of the operation transmission mechanism of the auxiliary caster lock mechanisms 4 ', 4''of the auxiliary double wheel caster 9 will be described with reference to FIG.
In FIG. 18, the upper wire branching board 62 and the branching wire 63 and the lower lever connecting wire 61 are the same as those in the first embodiment, but the amount of the branching wire is increased between the wire branching board 62 and the connecting wire 61. In order to cope with the above, a middle-stage wire branch board 62 'and a branch wire 63' are provided, and further, a new wire branch board 64 for bifurcating to act on the wire branch board 62 and the wire branch board 62 'is provided. Yes. The terminal end 611b of the lever connecting wire 61 is fitted to the fitting portion 6221 of the slider 622 of the branching board 64 on the input side of the wire branching board 64, and the connecting wire 64a ( * 1) and the connecting wire 64b (* 2) from the wire branch board 62 ′ are fitted in the fitting portion 6222 of the slider 622 of the branch board 64.
In the second embodiment, the auxiliary caster lock mechanism 4 ′ is connected to branch wires 63a and 63b on the output side of the wire branch board 62 ′ to lock / unlock the auxiliary twin wheel casters 9 (91a and 91b). The caster lock mechanism 4 ″ is connected to branch wires 63c and 63d on the output side of the wire branch board 62 ′, and the auxiliary twin wheel casters 9 (92a and 92b) are locked / unlocked.
The action / effect of the wheelchair of the second embodiment described above is the same as that of the first embodiment except that the wheelchair is more firmly fixed to the floor.

  Of course, the present invention is not limited to the above-described embodiments as long as the features of the present invention are not impaired. For example, the number of twin-wheel casters is two or six in total. However, as long as they have the same action, four wheels, six wheels or more, and more may be used. Also, although a plurality of branch boards are provided, a single branch board may be provided to correspond to each branch wire.

1 .. Wheelchair 11 .. Seat part, 12 .. Pipe-shaped frame body 121..
122 .. back support frame, 123 .. upper end part, 124 .. gripping part,
125 ·· Front wheel support frame, 126 · · Footrest plate, 127 · · Outer part,
13. Back side,
2 (2a, 2b) ... rear wheels, 21 ... tire part, 22 ... axle,
3 (3a, 3b) ・ ・ Two-wheel caster (front wheel), 31 ・ ・ Wheel, 31A, 31B ・ ・ Wheel,
32 ... Wheel axle, 33 ... Wheel shaft fixing part, 34 ... Outer ring, 35 ... Internal gear,
4. Caster lock mechanism
4 ', 4''・ ・ Auxiliary caster (double wheel) lock mechanism,
··· Lock mechanism frame, 411 · · Wheel bearing part, 412 · · Fitting part,
413, 415 ... Storage part, 414 ... Projection ring, 416 ... Guide groove,
42 .. Rotating support part,
421 ・ ・ Fixed support cylinder member, 422 ・ ・ Mounting edge,
423 ・ ・ Swivel auxiliary washer, 424 ・ ・ Stopper (fixed snap ring),
425 ・ ・ Fixed circumferential groove for snap ring,
43 ... Knock part, 431 ... Knock member, 432 ... Upper tip, 433 ... Lower tip,
44 .. Wheel tooth meshing lock part, 441 .. Base part,
4411 ・ ・ Lower horizontal part, 4412 ・ ・ Upper horizontal part,
4413 ... Connecting part, 442,442a, 442b ... Tooth part, 443 ... Pressing spring,
444 ... Upper spring engagement part, 445 ... Lower spring engagement part,
45 ・ ・ Caster mounting bracket, 451 ・ ・ Front plate, 452 ・ ・ Side plate (side),
453 ... Back plate, 454 ... Bottom plate, 455 ... Frame body mounting part, 456 ... Bolt hole,
46 ・ ・ Slider cam, 461 ・ ・ Cam surface, 4611 ・ ・ Lowest point, 4612 ・ ・ Top point,
462,466,468 ・ ・ Locking part, 463 ・ ・ Horizontal upper surface, 464 ・ ・ Guide slot,
465 ・ ・ Guide shaft, 467 ・ ・ Coil spring,
5. Operation part,
51 .. Operation lever, 511 .. Rotation stopper locking part, 512 .. Lock holding locking part,
52 ・ ・ Rotating shaft, 53 ・ Wire end (ball) locking part, 54 ・ ・ Wire guide pulley,
55 ・ ・ Wire covering (outer circumference) locking part, 57 ・ ・ Rotation stopper, 58 ・ ・ Case,
6. Operation transmission mechanism, 60 (61, 62, 63) Operation transmission wire,
61 ・ ・ Lever connecting wire, 611a, 611b ・ ・ Terminal part,
612 ... Inner wire, 613 ... Cover (outer wire),
614 ・ ・ Mounting fixing part,
62,62 '.. Wire branch board,
622 ・ ・ Slider, 6221,6222 ・ ・ Fitting part, 623a, 623b ・ ・ Side plate,
63 (63a, 63b, 63c, 63d), 63 '(63a, 63b, 63c, 63d) ...
631,631a, 631b ... End, 632 ... Inner wire,
633 ・ ・ Coating part (outer wire), 634 ・ ・ Mounting fixing part,
64 ・ ・ Wire branch board, 64a, 64b ・ ・ Connection wire,
7. Tire brake mechanism,
71 .... Mounting frame, 711 ... Mounting fixing part, 712 ... Back plate, 713 ... Locking part,
72 .. Slide member, 721 .. Locking part, 722 .. Guide long hole,
723 ... Guide shaft, 724 ... Locking part, 725 ... Coil spring,
73 .. Rotating member, 731 .. Internal rotating arm part, 7311 .. End part,
732 ·· Rotating shaft, 733 ·· External rotating arm, 7331 ·· End,
74 .. Brake member,
8. Brake adjustment brake mechanism,
81 .. Brake frame,
82-Brake drum,
83 ·· Brake band, 831 ·· One end, 832 · · other end,
84 .. Rotating member, 841 .. Rotating shaft, 842 .. Rotating arm, 8421.
843 .. Rotating arm, 8431, 8432 .. Engagement part,
85 .. Coil spring,
86 .. Operation transmission wire, 861, 861a, 861b .. Branch wire,
8611 ... Inner wire, 8612 ... Cover (outer wire),
862 ・ ・ Lever connecting wire, 8621 ・ ・ Inner wire,
8622 ・ ・ Coating (outer wire),
87 .... Branch,
88 .. Rear wheel operation part, 881 .. Operation lever,
9. Auxiliary twin wheel casters,
91 (91a, 91b) ・ ・ Intermediate auxiliary twin wheel casters,
92 (92a, 92b) · · Rear wheel auxiliary twin wheel caster

Claims (3)

A wheelchair comprising a pair of large-diameter left and right rear wheels and at least a pair of twin-wheel caster left and right front wheels,
The front wheel of the two-wheel caster is provided with a caster lock mechanism for locking and unlocking,
The large-diameter rear wheel is provided with a tire brake mechanism that presses and brakes a part of the tire, and a braking adjustment brake mechanism that is provided with an operation mechanism that enables the braking force of the rear wheel to be adjusted.
One grip part at the rear part of the wheelchair is provided with an operation part for operating the caster lock mechanism and an operation part for operating the pair of tire brake mechanisms for the rear wheels, and these are operated simultaneously at the same time. Provide an operating lever,
A wheelchair characterized in that the other gripping portion is provided with an operation portion and an operation lever for adjusting the braking of the braking adjustment brake mechanism in an adjustable manner.   An operation lever for operating the lock operation mechanism of the twin-wheel caster and at least the pair of tire brake mechanisms of the rear wheel is configured to release the lock of the caster and release the pressure of the rear wheel tire when the operation lever is gripped. The wheelchair according to claim 1.   A pair of left and right auxiliary twin-wheel casters are provided on the front and rear of the large-diameter left and right rear wheels, and an auxiliary caster lock mechanism is also provided on the twin-wheel casters. The auxiliary caster lock mechanism includes the front wheel caster lock mechanism and the rear wheel The wheelchair according to claim 2, further comprising an operation lever that is operated simultaneously with the tire brake mechanism.

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