JP2010075535A - Wheelchair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheelchair in which the axle position of a wheel can be freely set and a drive part unit or the wheel can be detached from the wheelchair independently, and which can be used as a manual wheelchair when the drive part unit is detached. <P>SOLUTION: The wheelchair 10 includes: a bearing unit 40 which is detachably attached to a frame 30 supporting a seat 20; the wheel 50 in which the axle 51 is attached to the bearing unit 40 so as to be relatively rotated; and the drive part unit 70 which drives the axle 51 and is detachably attached to the bearing unit 40. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wheelchair provided with a detachable drive unit.

  A drive unit of a conventional electric wheelchair includes a motor, a speed reducer to which the driving force of the motor is input, a non-rotating fixed casing that can be attached to the side frame of the wheelchair body via an attachment base, An output part that transmits the output of the reduction gear to the axle and a bearing that rotatably supports the axle at a single location are arranged concentrically around an axis that passes through the center of rotation of the axle. ing. Therefore, the position of the axle can be set to a desired position (see, for example, Patent Document 1).

  In addition, the conventional electric wheelchair includes a wheel in the wheelchair body, and an electric wheelchair including an electric motor that rotationally drives the wheel. It can be removed and attached to the main body. For example, remove the wheel from the wheelchair body and attach it so that both the stator with the coil that is the electrical connection part of the electric motor and the rotor with the permanent magnet that rotates adjacently inside the rotor remain on the wheelchair body side. It is possible. Alternatively, a rotor including a permanent magnet that rotates adjacent to the side surface of the stator as a state in which a stator including a coil that is an electrical connection portion of an electric motor remains on the wheelchair body side and a wheel integrated with the rotor to the wheelchair body. Can be removed and attached. Therefore, when the wheel is removed or attached, the electrical wiring is not interrupted or connected (see, for example, Patent Document 2).

In addition, the conventional wheelchair is fixed to the frame on which a user's seat is provided, a support provided on the frame and capable of supporting an axle of a non-driven wheel driven only by the user's human power, In a wheelchair comprising: a drive unit that generates a drive force by a motor; and a drive wheel that is driven by the drive force generated by the drive unit and rotates about a hub, the wheelchair is inserted into the support unit and the drive unit. A shaft member provided with one part, the other part inserted through the hub, an intermediate part located between the one part and the other part, and screwed into the one part of the shaft member; A nut member that sandwiches the support portion between the drive unit and the intermediate portion; a drive member that is coupled to the drive unit and that is rotated by a drive force generated by the drive unit; Attached to the outside of the hub, and a driven member that rotates integrally with the hub receives a driving force from the drive member. Therefore, the position of the wheel axle does not change with respect to the front-rear direction of the wheelchair when the wheelchair is an electric type or a manual type (see, for example, Patent Document 3).
Japanese Patent No. 3444582 JP-A-9-308651 JP 2007-268243 A

  However, since the drive unit of the wheelchair of Patent Document 1 includes a bearing, the wheel cannot be attached to the wheelchair body when the drive unit is detached from the wheelchair body. Further, when removing the drive unit for reasons such as repair or replacement, the drive unit must first be removed after removing the wheels.

  Moreover, although the wheelchair of patent document 2 can remove and attach a wheel from a wheelchair main body as the state where an electric connection part remains in a wheelchair main body side among electric motors, it is the electric motor provided with respect to the wheelchair main body. Removal is not expected. Further, if the electric motor is removed, the wheel shaft cannot be attached to the wheelchair body because the wheel shaft is locked to the electric motor. Further, when removing the electric motor, the electric motor must first be removed after removing the wheels.

  The wheelchair of Patent Document 3 includes a drive member and a driven member in order to solve the difference between the output shaft of the drive unit and the axle position of the wheel, although the drive unit or the wheel is supported by the support portion. . Moreover, the support part is provided in the flame | frame (it is not specified whether the position adjustment with respect to a support part is assumed).

  The present invention has been made in view of the above problems, and the wheel axle position can be freely set, the drive unit or the wheel can be detached from the wheelchair independently, and when the drive unit is removed, the wheelchair is manually operated. It aims at providing the wheelchair which can be used as.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a bearing unit that is detachably attached to a frame that supports a seat, a wheel that is rotatably attached to the bearing unit via an axle, and the axle. And a drive unit that is detachably attached to the bearing unit.

  According to a second aspect of the present invention, the drive unit includes a motor, a speed reducer that decelerates the rotation of the motor and transmits the rotation to the axle, and transmits the rotation from the speed reducer to the axle. An output portion is provided, and the output portion is arranged concentrically around an axis passing through the rotation center of the axle.

  In the invention according to claim 3, the axle of the wheel is attached to the bearing unit via a plunger mechanism.

  According to the first aspect of the present invention, the bearing unit is detachably attached to the wheelchair frame and the drive unit is detachably attached to the bearing unit. Therefore, the drive unit can be removed without removing the wheels. Moreover, it can be used as a manual wheelchair with the drive unit removed from the bearing unit. In addition, since the bearing unit can be attached to and detached from the wheelchair frame and the position of the bearing unit relative to the wheelchair frame can be adjusted, wheels having different diameters can be attached without changing the vehicle height of the wheelchair.

  Further, in the invention according to claim 2, since the motor, the speed reducer, and the output portion are arranged concentrically around an axis passing through the rotation center of the axle, between the output portion and the wheel axle. A member for transmitting rotation is unnecessary, and the number of parts is reduced.

  In the invention according to claim 3, since the axle of the wheel is attached to the bearing unit via a plunger mechanism, it is easy to attach / remove the wheel to / from the wheelchair.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view showing a wheelchair 10 of the present invention. The wheelchair 10 includes a seat 20 on which a user sits, a frame 30 that supports the seat 20, a bearing unit 40 that is attached to the frame 30, and a wheel 50 that is attached to the bearing unit 40 via an axle 51 so as to be relatively rotatable. A hand rim 60 provided on the wheel 50, a drive unit 70 that is attached to the bearing unit 40 and drives the axle 51 of the wheel 50, and a control lever 80 that a user controls the rotation of the wheel 50 via the drive unit 70. And a caregiver handle 90 attached to the frame 30 and extending to the rear portion of the seat 20.

  The bearing unit 40 is bolted to the frame 30 of the wheelchair 10. Since the bearing unit 40 is attached to a substantially vertical portion of the frame 30 of the wheelchair 10, the position adjustment in the vertical direction is possible within the range of the vertical portion.

  FIG. 2 is a sectional view showing the wheel 50, the bearing unit 40, and the drive unit 70 of the wheelchair 10 according to the present invention. The bearing unit 40 includes a bearing 41 to which an axle 51 of the wheel 50 is attached so as to be relatively rotatable. A drive unit 70 is attached to the bearing unit 40 via a plunger 71. The drive unit 70 includes a motor 72, a speed reducer 73 that reduces and transmits the rotation of the motor 72, and an output unit 74 that transmits the rotation from the speed reducer 73 to the axle. The output unit 74 of the speed reducer 73 is arranged concentrically around an axis passing through the center of rotation of the axle 51 of the wheel 50 and is splined to the axle 51. Therefore, unlike the case where the output portion of the conventional drive unit is different from the wheel axle, no drive member or driven member is required, and therefore the number of parts can be reduced.

  An axle 51 of a wheel 50 is attached to the bearing unit 40 via a ball plunger 52 (plunger mechanism) so as to be relatively rotatable. A plunger button 53 is provided on the side of the axle 51 that is opposite to the shaft 51 that is inserted into the bearing unit 40. When the plunger button 53 is pressed while the axle 51 of the wheel 50 is attached to the bearing unit 40, the engagement between the ball plunger 52 and the bearing unit 40 is released, and the wheel 50 can be removed from the bearing unit 40. .

  In the state where the drive unit 70 is attached to the bearing unit 40, when the axle 51 of the wheel 50 is attached to the bearing unit 40, the tip of the wheel 50 on the drive unit unit 70 side from the ball plunger 52 of the axle 51 of the wheel 50 is The unit 70 is splined to the output unit 74 and rotates integrally with the output unit 74.

  FIG. 3 is a partially enlarged perspective view showing a structure for attaching the drive unit 70 to the bearing unit 40 of the wheelchair 10 according to the present invention. The case 75 of the drive unit 70 includes a centering part 76, a screw part 77, and a plunger 71. With the plunger 71 pulled from the right side of FIG. 2, the centering portion 76 and the screw portion 77 of FIG. 3 are inserted into the mounting hole portion 42 of the bearing unit 40, and the drive unit 70 is rotated with respect to the bearing unit 40. Then, the screw part 77 meshes with the mounting hole part 42 of the bearing unit 40 and is fixed. When the hand is released from the plunger 71, the plunger 71 returns to its original position by the restoring force of the spring and is inserted into the plunger receiving hole 43 of the bearing unit 40. In this way, the drive unit 70 is attached to the bearing unit 40. Similarly, when the plunger 71 is pulled with the drive unit 70 attached to the bearing unit 40 and the drive unit 70 is rotated with respect to the bearing unit 40, the drive unit 70 can be removed from the bearing unit 40. .

  The operation of the wheelchair 10 of the present invention will be described in detail with reference to the drawings. FIG. 4 is a cross-sectional view showing the wheel 50, the bearing unit 40, and the drive unit 70 of the wheelchair 10 according to the present invention, and the case where the wheel 50 is removed from the bearing unit 40. As shown in FIG. 2, the bearing unit 40 is attached to the frame 30 of the wheelchair 10, the drive unit 70 is attached to the bearing unit 40, and the axle 51 of the wheel 50 is inserted through the bearing unit 40 and the drive unit 70. When the plunger button 53 provided on the axle 51 of the wheel 50 is pushed, the ball plunger 52 engaged with the bearing unit 40 is detached from the bearing unit 40, and the axle 51 of the wheel 50 is removed from the bearing unit 40. I can do it. When the wheel 50 is pulled to the left, the axle 51 of the wheel 50 is removed from the output unit 74 of the drive unit 70. Therefore, the wheel 50 provided integrally with the axle 51 can be easily removed from the bearing unit 40 and the drive unit 70 of the wheelchair 10. The removal of the wheel 50 is convenient when the wheelchair 10 is loaded on a car or when the wheelchair 10 is used by exchanging wheels outdoors and indoors.

  FIG. 5 is a cross-sectional view showing the wheel 50, the bearing unit 40, and the drive unit 70 of the wheelchair 10 according to the present invention, and the case where the drive unit 70 is removed from the bearing unit 40. 2, when the plunger 71 provided on the drive unit 70 is pulled from the right side and the drive unit 70 is rotated as already described with reference to FIG. 3, the centering portion 76 and the screw portion 77 are rotated. Is removed from the mounting hole 42 of the bearing unit 40. When the drive unit 70 is pulled from the right, the output unit 74 of the drive unit 70 is removed from the axle 51 of the wheel 50. Thus, even when the drive unit 70 is removed, the axle 51 of the wheel 50 is attached to the bearing unit 40 attached to the frame 30 so as to be relatively rotatable, and therefore used as a manual wheelchair 10. I can do it.

  As described above, the drive unit 70 or the wheel 50 can be detached from the wheelchair 10 independently.

  The bearing unit 40 is attached to the frame 30 of the wheelchair 10, the drive unit 70 is attached to the bearing unit 40, and the axle 51 of the wheel 50 is attached to the bearing unit 40 and (in the case of an electric wheelchair) to the drive unit 70. Since it is a structure, the bearing unit 40 of the wheelchair 10 of this invention, the drive part unit 70, and the wheel 50 are adapted to various wheelchairs by designing and preparing the attachment part to the frame of a wheelchair with respect to various wheelchairs. I can do it.

It is a disassembled perspective view which shows the wheelchair of this invention. It is sectional drawing which shows the wheel of the wheelchair of this invention, a bearing unit, and a drive part unit. It is a partial expansion perspective view which shows the attachment structure of the drive part unit to the bearing unit of the wheelchair of this invention. It is sectional drawing which shows the wheel of the wheelchair of this invention, a bearing unit, and a drive part unit, and shows the case where a wheel is removed from a bearing unit. It is sectional drawing which shows the wheel of the wheelchair of this invention, a bearing unit, and a drive part unit, and shows the case where a drive part unit is removed from a bearing unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wheelchair 20 Seat 30 Frame 40 Bearing unit 50 Wheel 51 Axle 52 Ball plunger (plunger mechanism part)
70 Drive unit 72 Motor 73 Reducer 74 Output unit

Claims (3)

A bearing unit that is detachably attached to a frame that supports the seat;
A wheel attached to the bearing unit via an axle so as to be relatively rotatable;
A wheelchair comprising: a drive unit that drives the axle and is detachably attached to the bearing unit. The drive unit includes a motor, a speed reducer that reduces the rotation of the motor and transmits the rotation to the axle, and an output unit that transmits the rotation from the speed reducer to the axle. The wheelchair according to claim 1, wherein the wheelchair is arranged concentrically around an axis passing through the center of rotation of the axle. The wheelchair according to claim 1 or 2, wherein the wheel axle is attached to the bearing unit via a plunger mechanism.

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