JP3122903U - Wheelchair speed reducer - Google Patents

Abstract

【Task】
Provided is a wheelchair speed reduction device configured to be removable according to the physical strength of a user without substantially changing the structure of an existing wheelchair.
[Solution]
It is provided between the axle of at least one main wheel of the wheelchair and a drive handle mounted on a drive handle bearing device that can be manually operated by the occupant and attached to the axle of the main wheel, and the occupant manually operates the drive handle. The wheelchair speed reduction device configured to be able to travel by being driven by is configured as a unit that can be attached to and detached from the frame of the wheelchair body.
[Selection] Figure 5

Description

  The present invention relates to a reduction device for a wheelchair that can be used easily and continuously even by a passenger with a relatively weak force as a means of movement indoors or outdoors.

  The independence and access to society in the daily life of wheelchair users is greatly influenced by the ability of the wheelchair to run on its own. If a caregiver is attached and you can push the wheelchair from behind, this is not a problem, but in order for the user to continue running the wheelchair himself, the existing wheelchair usually requires considerable force, Will feel burdensome. Therefore, for example, when an elderly person or a woman uses a wheelchair, the use range and time are naturally restricted, and the behavior alone is also restricted. In outdoor activities, there are slopes and steps, and there are cases where it is unavoidable to go around and avoid use in such an environment.

  In order to make it possible for elderly people and women with relatively weak physical strength to use a wheelchair alone, conventionally, wheelchairs using an electric type or auxiliary power have been proposed (Patent Document 1, Patent Document). 2). However, wheelchairs that use electric or electric power as a supplement are not only heavy and heavy, but require considerable effort when loading and unloading them into the car. There is a drawback that the life of the battery is also a problem.

  On the other hand, manual wheelchairs have also been proposed that are devised to facilitate handling even if the user's physical strength is weak. For example, the front wheel is a large wheel that can be driven by lever operation with front wheel drive (see Patent Document 3), the hand rim is provided at a position where it can be easily operated (see Patent Document 4), and the wheel and hand rim rotate. Some have a speed change mechanism that changes the number ratio (see Patent Document 5).

However, all of the conventionally proposed manual wheelchairs are designed specifically for this purpose, which is satisfactory for users who have relatively little physical strength. Some users have problems such as slow movement and poor usability.
JP 2002-85465 A Japanese Patent Laid-Open No. 10-14882 JP 2002-219149 A JP 2001-204769 A JP-A-9-24067

  In view of the above problems, an object of the present invention is to provide a reduction device for a wheelchair that is configured to be removable according to the physical strength of a user without substantially changing the structure of an existing wheelchair.

  In order to achieve the above object, in the present invention, an axle of at least one main wheel of a wheelchair, a drive handle attached to a drive handle bearing device that can be manually operated by a passenger and attached to the axle of the main wheel, The wheelchair speed reduction device provided between the vehicle and configured to allow the passenger to travel by manually driving the drive handle is configured as a unit that can be attached to and detached from the frame of the wheelchair body. .

  The speed reducer includes a support frame that receives an axle of a main wheel of a wheelchair on one end side and an idle mechanism on the other end side, a first sprocket provided on a drive handle bearing device attached to the axle, and a wheelchair. A second sprocket attached to the hub of the main wheel, the first idle sprocket having the same number of teeth as the second sprocket attached to the hub, and provided in the idle mechanism. A second idle sprocket having the same number of teeth as the first sprocket attached to the axle; the first sprocket and the first chain hung on the first idle sprocket; the second idle sprocket; A second chain hung on the second sprocket, and the rotation of the drive handle is controlled by the first and second It said first sprocket by En, the first idle sprocket may be configured to decelerate the transmission to the main wheel via the second idle sprocket and the second sprocket.

  The number of teeth of the first and second sprockets and the first and second idle sprockets can be set to have a desired reduction ratio.

  The speed reducer may be configured as an integral unit.

  The support frame may be detachably fixed to the frame of the wheelchair body.

  The wheelchair speed reduction device according to the present invention can be manufactured at low cost and can be easily and easily mounted on a wheelchair that is used even when the wheelchair user becomes difficult to continue using due to aging or weakness. This makes it possible to use the wheelchair without power, and if it is no longer used or used by another relatively strong user, The wheelchair can be used more effectively and effectively.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a hub 1 of a main wheel (not shown) of a wheelchair to which the present invention is applied, and the hub 1 includes two hub flanges 1a and a number of spokes 1b. A sprocket 2 constituting the second sprocket shown in FIG. 2 is attached to one of the hub flanges 1a of the hub 1, and the attached state is shown in FIG. As shown in FIG. 2, the sprocket 2 includes seven screw holes 2a and protrusions 2b each having a height of about 3 mm. As shown in FIG. 3A, the sprocket 2 is fixed to the outer side of one hub flange 1a by a cap screw (not shown) so as not to contact each spoke 1b.

  FIG. 4 shows a support frame 4 of the speed reducer according to the present invention. The support frame 4 is welded with a shaft fixing boss 4a for receiving a hub shaft 5 of a main wheel of a wheelchair on one end side and idle on the other end side. A U-shaped notch 4b for receiving the mechanism is provided, two cover mounting portions 4c for attaching the cover 6 are provided in the middle, and a chain tension member 4d is provided along the U-shaped notch 4b provided on the other end side. Is provided.

  An idle mechanism 7 shown in FIG. 5 is attached to a U-shaped notch 4b provided on the other end side of the support frame 4, and the idle mechanism 7 has a groove 8a that fits into the U-shaped notch 4b. A bearing casing 8, a bearing 9 fixed by a snap ring in the bearing casing 8, an idle shaft 10 that is rotatably supported by the bearing 9 through the bearing casing 8, and a flange 10 a at one end of the idle shaft 10 A first idle sprocket 11 to be fixed, and a second idle sprocket 13 fixed to a sprocket idle nut 12 screwed to a screw portion 10b at the other end of the idle shaft 10 via a spacer 12a. Yes. The idle shaft 10 and the sprocket idle nut 12 are processed to prevent rotation after being assembled.

  A hub fixing member 14 is fixed to the hub shaft 5 with a hollow set. The hub shaft 5 is attached to a shaft fixing boss 4 a provided on one end side of the support frame 4 with a roll pin 15. A handle bearing casing 18 having two bearings 17 is incorporated in the hub shaft 5 with a spacer 16 in between, and is fixed by a presser fitting 19 and a cap screw 20.

  A sprocket 21 constituting the first sprocket is attached to the handle bearing casing 18 by four cap screws (not shown), and the sprocket 21 is configured to have the same fraction as the second idle sprocket 13. . A chain 22 is hung between the sprocket 21 and the second idle sprocket 13 in the idle mechanism 7 attached to the U-shaped notch 4b on the other end side of the support frame 4, and the tension of the chain 22 is the chain tension member 4d. It is adjusted with.

 A hub axle 5 is inserted into the hub 1 of the main wheel of the wheelchair to which the sprocket 2 is attached from the side of the sprocket 2, adjusted with a hub adjusting nut 23, and fixed with a lock nut 24. In this assembled state, a chain 25 is hung between the sprocket 2 and the first idle sprocket 11 in the idle mechanism 7, and the chain 25 is interposed between the sprocket 21 and the second idle sprocket 13 in the idle mechanism 7. The same length as the chain 22 to be hung is used. The chain cover 6 (see FIGS. 4 and 6) is attached to the two cover attaching portions 4c of the support frame 4 by the bolts 26 in the assembly thus assembled.

  Further, on the hub shaft 5, a handle 27 shown in FIG. 7 is fixed to the handle bearing casing 18 by two hollow sets 28, and thus the speed reducer is assembled.

  The speed reducer assembled in this way is used by being firmly fixed to the frame of the wheelchair body in order to be mounted on the main wheels on both sides of the wheelchair.

BRIEF DESCRIPTION OF THE DRAWINGS (A) which shows the hub of the main wheel of the wheelchair which can use the reduction gear of this invention is a schematic side view, (B) is a schematic front view. FIG. 2A is a schematic front view showing a sprocket constituting a part of the speed reducer of the present invention mounted on the hub of FIG. 1, FIG. 2B is a sectional view, and FIG. (A) which shows the state which mounted | wore the hub of FIG. 1 with the sprocket of FIG. 2 is a schematic front view, (B) is a schematic side view. Schematic which shows the support frame which comprises some deceleration devices of this invention. The schematic sectional drawing which shows the assembly state of the principal part of the speed reducer of this invention. The schematic exploded perspective view which shows the principal part of the speed reducer of this invention. (A) which shows the handle | steering-wheel of a wheelchair is a schematic sectional drawing, (B) is a schematic partial drawing.

Explanation of symbols

1: Hub 1a: Hub flange 1b: Spoke 2: Sprocket 2a: Screw hole 3: Mounting bracket 4: Support frame 4a: Shaft fixing boss 4b: U-shaped notch 4c: Cover mounting portion 4d: Chain tension member 5: Hub shaft 6: Cover 7: Idle mechanism 8: Bearing casing 8a: Groove of bearing casing 8 9: Bearing 10: Idle shaft 10a: Flange 11: First idle sprocket 12: Sprocket idle nut 13: Second idle sprocket 14: Hub Fixing member 15: Roll pin 16: Spacer 17: Bearing 18: Handle bearing casing 19: Press fitting 20: Cap screw 21: Sprocket 22: Chain 23: Hub adjustment nut 24: Lock nut 25: Chain 26: Bolt 27: Handle 28: Hollow set

Claims (5)

  Provided between the axle of at least one main wheel of the wheelchair and the drive handle mounted on the drive handle bearing device that can be manually operated by the occupant and mounted on the axle of the main wheel. A wheelchair speed reduction device configured to be able to travel by being driven by a wheelchair, wherein the speed reduction device is configured as a unit that can be attached to and detached from a frame of the wheelchair body.   The speed reducer includes a support frame that receives the axle of the main wheel of the wheelchair on one end and an idle mechanism on the other end, a first sprocket provided on a drive handle bearing device attached to the axle, A second sprocket attached to a hub of a main wheel; a first idle sprocket having the same number of teeth as the second sprocket attached to the hub; and the idler mechanism; A second idle sprocket having the same number of teeth as the first sprocket attached to the first sprocket, the first sprocket and the first chain hung on the first idle sprocket, the second idle sprocket and the above A second chain hung on the second sprocket, and the rotation of the drive handle is controlled by the first and second chains. And the first sprocket, the first idle sprocket, the second idle sprocket, and the second sprocket are used to decelerate and transmit to the main wheel. The wheelchair speed reducer according to 1.   The wheelchair speed reduction device according to claim 1, wherein the number of teeth of the first and second sprockets and the first and second idle sprockets is set to a desired reduction ratio.   The wheelchair speed reduction device according to claim 1, wherein the speed reduction device is configured as a unit having an integral structure. The wheelchair reduction device according to claim 1, wherein the support frame is detachably fixed to a frame of the wheelchair body.

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