JP2018126352A - Synchronous structure of parking brake and parking brake unit body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe synchronous structure of a parking brake capable of allowing an operation of one operation lever to perform an operation of the other side brake by synchronization.SOLUTION: In a synchronous structure 30 of a parking brake, when one operation part 70 is operated so as to allow one brake part 80 corresponding to the operation part 70 to move with respect to a corresponding main wheel 2, one of a first inner wire 33 and a second inner wire 34 is pulled toward the one operation part 70 so as to rotate the other operation part 70 by linkage. Besides, the other brake part 80 corresponding to the other operation part 70 moves in a direction being the same as that of the one brake part 80 with respect to a corresponding main wheel 2. The structure also includes a first outer wire 35 and a second outer wire 36 for at least partially covering the first inner wire 33 and the second inner wire 34.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a parking brake synchronization structure used in a wheelchair and a parking brake unit body having a parking brake synchronization structure.

  Conventionally, a wheelchair has been provided with a parking brake that stops the rotation of the main wheel. This parking brake is generally attached to each front side of a pair of left and right main wheels, and controls the rotation of the corresponding main wheels by operating the operation levers individually.

  Here, in order to park the wheelchair safely and reliably, both the left and right main wheels need to be stopped, which requires time and effort to operate the parking brakes corresponding to both the left and right wheels.

  Therefore, in Patent Document 1, for example, one end of the inner wire is provided on a bracket that supports one or the other brake via an outer wire holder that is provided on one or the other brake operation lever and holds one end of the outer wire. Power provided with two brake wires fixed to the outer wire holder via the outer wire stopper provided on the bracket supporting the other or one brake while the other end of the inner wire is fixed A brake for a wheelchair having a transmission synchronization structure has been proposed.

Japanese Patent Application Laid-Open No. 2015-217081

  However, in the configuration of Patent Document 1, the outer wire that transmits the power is exposed to the outside in accordance with the brake operation of the operation lever of one brake in the power transmission synchronization structure, and the outer wire is the other member. There is a problem that both the left and right brakes can no longer be operated. In particular, since the brake wire is arranged so that it is passed to the left and right under the wheelchair seat, when the load is placed on the lower part of the wheelchair, the brake wire is caught and the brake wire is properly There is a risk of malfunction.

  Therefore, an object of the present invention is to provide a safe parking brake synchronization structure in which the other brake is also operated in synchronization with each other by operating one operation lever.

  Moreover, an object of this invention is to provide the parking brake unit body provided with the synchronous structure of the said parking brake.

  The present invention relates to a synchronization structure of a parking brake used for a pair of left and right wheels attached to a wheelchair body of a wheelchair, provided at a position adjacent to each of the wheels in the wheelchair body, A pair of left and right base portions each having a moving axis defined thereon, and are attached to the base portion so as to be rotatable about the operation portion rotation axis, and on one side with respect to the operation portion rotation axis A pair of left and right operation parts having one side fixing part on the other side and the other side fixing part on the other side, and connected to the operation part, corresponding to the rotation direction of the operated operation part. A pair of left and right brake parts that are pressed against the wheels by moving in the direction of the wheels and stopping the wheels or moving in the direction away from the wheels to rotate the wheels. Further, the pair of left and right operations A first connecting member that connects one side fixing portion of one operation portion and the other side fixing portion of the other operation portion, one side fixing portion of the other operation portion, and the other of the one operation portion A second connecting member for connecting to the side fixing portion, a first covering member for covering at least a part of the first connecting member, and a second for covering at least a part of the second connecting member. A first covering member, and each one end of the first covering member and the second covering member is fixed to the one base member, and the first covering member and the second covering member. Each other end of the member is fixed to the other base member, and when one of the operating parts is operated and one brake part corresponding to the operating part moves with respect to the corresponding wheel, One of the first connecting member and the second connecting member is the one The other operation portion is pulled in the operation portion side and rotates in conjunction with the other operation portion, and the other brake portion corresponding to the operation portion also moves in the same direction as the one brake portion with respect to the corresponding wheel. When the other operation portion is operated and the other brake portion corresponding to the operation portion moves with respect to the corresponding wheel, any of the first connection member and the second connection member is moved along with this. Either one is pulled toward the other operation portion, the one operation portion is rotated in conjunction with the other operation portion, and one brake portion corresponding to the operation portion also has the other brake with respect to the corresponding wheel. It is the synchronous structure of the parking brake characterized by moving in the same direction as a part.

  In such a configuration, either the first connection member or the second connection member is pulled by the operation of one of the pair of left and right operation units, and the other operation unit is also interlocked. Rotate. Thus, when operating the parking brake, it is possible to move both brake parts in the same manner with respect to the corresponding wheels only by operating one of the left and right operation parts. Moreover, in the first connecting member and the second connecting member, the section between the pair of left and right base portions is covered with a covering member, and both the connecting members are not subjected to external interference. For this reason, a possibility that a load etc. will be caught by both connecting members is reduced, and it can be set as a highly safe structure.

  In addition, since the first covering member and the second covering member are in the fixed form as described above, even when the operation unit is operated, the first covering member and the second covering member may move to one operation unit side. There is no. That is, the means for transmitting the operating force of one operating unit to the other operating unit is only the first connecting member and the second connecting member.

  Further, the present invention is a parking brake unit body provided with a synchronization structure of the parking brake, wherein the base portion is constituted by a base part that is detachably attached to a wheelchair body. Is the body.

  In this configuration, since the base part can be attached to and detached from the wheelchair body, for example, the base part is newly fixed to the wheelchair body even for an existing wheelchair that does not have a parking brake synchronization structure. This makes it possible to newly assemble the parking brake synchronization structure of the present invention.

The wheelchair concerning an Example is shown, (a) is a right view, (b) is a left view. (A) is a front view of the parking brake for left wheels, (b) is a partial expanded sectional view of a lower side fixing | fixed part. It is a side view of the parking brake for left wheels in which the brake part is in a separated state. It is a side view of the parking brake for left wheels in which the brake part is in a pressure contact state. It is explanatory drawing of the synchronous structure of the parking brake in which the brake part is a release state. It is explanatory drawing of the synchronous structure of the parking brake in which the brake part is a press-contact state.

  Hereinafter, the embodiment which actualized the synchronous structure of the parking brake for wheelchairs of the present invention is described in detail. In addition, this invention is not limited to the Example shown below, A design change is possible suitably.

  As shown in FIG. 1, the wheelchair 1 includes a wheelchair main body 10 made of a metal pipe. The wheelchair body 10 includes a left side frame 10A and a right side frame 10B. Each of the side frames 10A and 10B includes a base frame part 11 formed in the front-rear direction, a rear leg frame part 12 rising from the base frame part 11, and The back frame portion 13 extends further upward from the rear leg frame portion 12, and the seat frame portion 15 extends forward and horizontally from the upper end portion of the rear leg frame portion 12.

  Further, the rear leg frame 12 is provided with a rotating shaft portion 3 of a main wheel 2 as a wheel on which a tire is mounted. In addition, since what was conventionally used can be employ | adopted suitably as the main wheel 2, detailed description is abbreviate | omitted.

  Further, a front frame portion 25 is passed in the vertical direction at the front end portions of the base frame portion 11 and the seat frame portion 15, and a caster 26 as a wheel is attached to the lower end of the front frame portion 25. A foot frame 27 is attached to the front portion of the front frame portion 25, and a footrest 28 is attached to the foot frame 27.

  A flat brake mounting plate 29 is mounted adjacent to the main wheel 2 at a position in front of the main wheel 2 in the seat frame 15.

  Next, the synchronization structure 30 (hereinafter simply referred to as the synchronization structure 30) of the parking brakes 31 and 32 used for the main wheel 2 will be described in detail.

  The synchronization structure 30 includes a left wheel parking brake 31 shown in FIG. 2 and the like, and a right wheel parking brake 32 shown in FIG.

  Hereinafter, the left wheel parking brake 31 will be described in detail. The right wheel parking brake 32 is symmetrical to the left wheel parking brake 31 and will not be described.

  As shown in FIGS. 2A and 3, the left wheel parking brake 31 includes a base portion 40 made of a plate member fixed to the brake mounting plate 29. Specifically, the base portion 40 is provided with an operation portion rotation shaft 41 and a brake portion rotation shaft 42 which are configured by a shaft member penetrating in the plate thickness direction. A base portion 40 is detachably fixed to the brake mounting plate 29 via a brake portion rotating shaft 42.

  An outer fixing portion 45 is erected outwardly along the axial direction of the main wheel 2 at the end of the base portion 40 on the main wheel 2 side. A pair of hollow relay bolts 46 are attached to the outer fixing portion 45 in a pair.

  Further, as shown in FIG. 2A, a lever portion 50 made of a plate piece member bent in a substantially Z shape when viewed from the front is attached to the operation portion rotating shaft 41. With this configuration, the lever portion 50 is rotatable about the operation portion rotation shaft 41.

  More specifically, the upper end of the lever portion 50 is formed with an operation lever 56 that can be operated by a wheelchair user or a caregiver by hand. In addition, an upper fixing portion 51 that is a one-side fixing portion is provided at a position above the operation portion rotation shaft 41 in a substantially central portion of the lever portion 50. On the other hand, a lower fixing portion 52 which is the other side fixing portion is provided at a position below the operation portion rotating shaft 41 at a substantially lower end portion of the lever portion 50. The distance from the operation unit rotation shaft 41 to the upper fixing unit 51 and the distance from the operation unit rotation shaft 41 to the lower fixing unit 52 are determined to be equal.

  A lever portion side link shaft 55 is provided at a position closer to the main wheel 2 side (rear side) than the operation portion rotation shaft 41 of the lever portion 50.

  A link portion 60 made of a substantially U-shaped member in front view is attached to the lever portion side link shaft 55 so as to be rotatable about the lever portion side link shaft 55. And the lever part 50 is inserted in the opening part opened toward back in the link part 60, and it has a structure where the link part 60 pinches | interposes the lever part 50 in a plate | board thickness direction. The link part 60 has a substantially boomerang shape in a side view, and a lever part side link shaft 55 is provided on one end side thereof.

  The lever unit 50 and the link unit 60 constitute an operation unit 70.

  Further, one end of a plate-shaped brake portion 80 is rotatably attached to the brake portion rotation shaft 42 of the base portion 40. On the other hand, a brake portion side link shaft 65 located at the other end portion of the link portion 60 is provided at the other end portion of the brake portion 80.

  Further, a brake shoe 81 is erected outward from the other end of the brake unit 80 along the axle direction of the main wheel 2. Specifically, the brake shoe 81 is disposed in front of the main wheel 2 so as to cross.

  In the separated state α in which the main wheel 2 and the brake shoe 81 are separated from each other as shown in FIG. 3, the lever portion side separation regulating surface 57 formed on the outer peripheral edge of the lever portion 50 and the brake portion 80. The brake part side release-time regulating surface 87 formed on the outer peripheral edge of each other is in contact with each other. Therefore, in the left wheel parking brake 31, the range of the rotation angle is restricted so that the lever portion 50 does not further rotate toward the main wheel 2 in the open state α.

  Next, the inner wires 33 and 34 as the connecting members and the outer wires 35 and 36 as the covering members that cover the inner wires 33 and 34 provided in the synchronization structure 30 will be described in detail.

  One end of a first inner wire (first connecting member) 33 is attached to the upper fixing portion 51 provided in the lever portion 50 of the parking brake 31 for the left wheel. Specifically, a free pin 47 that is rotatable about an axis parallel to the axial direction of the operation portion rotation shaft 41 is disposed on the upper fixed portion 51, and the first inner wire 33 is connected to the free pin 47. One end is connected.

  Further, the other end of the first inner wire 33 is fixed to a lower fixing portion 52 provided in the lever portion 50 of the right wheel parking brake 32, as shown in FIG.

  The first inner wire 33 is preferably a metal wire that is flexible and does not substantially elastically shrink.

  Similarly, one end of a second inner wire (second connecting member) 34 is attached to the upper fixing portion 51 provided in the lever portion 50 of the parking brake 32 for the right wheel. Note that one end of the second inner wire 34 is also rotatable on the axis parallel to the axial direction of the operation portion rotation shaft 41, similarly to the upper fixing portion 51 in the parking brake 31 for the left wheel. Is attached.

  The other end of the second inner wire 34 is fixed to a lower fixing portion 52 provided on the lever portion 50 of the left-wheel parking brake 31.

  The second inner wire 34 can be preferably made of a metal wire material that is flexible and does not substantially contract as in the case of the first inner wire 33.

  Here, the fixing structure of the inner wires 33 and 34 in each lower fixing part 52 will be described in detail. As shown in FIG. 2B, in the lever portion 50, the lower fixing portion 52 is provided with a non-circular D-hole portion 521 penetrating in the thickness direction of the lever portion 50. The fixing pin 48 having a corresponding cross-sectional shape is inserted through the hole 521. The other ends of the inner wires 33 and 34 are fixed to a fixing pin 48 that cannot rotate with respect to the lever portion 50. With this configuration, the other ends of the inner wires 33 and 34 are fixed to the lower fixing portion 52 in a state in which they are always directed in a predetermined direction with respect to the lever portion 50. By adopting such a fixing structure, the fatigue strength of the inner wires 33 and 34 is improved.

  As shown in FIGS. 3 and 5 and the like, a relay bolt 46 into which the first inner wire 33 is inserted is provided on the upper portion of the outer fixing portion 45 provided on the base portion 40 in the parking brake 31 for the left wheel. One end of the first outer wire (first covering member) 35 is fixed through the gap. On the other hand, the other end of the first outer wire 35 is a relay bolt 46 in which the first inner wire 33 is inserted into the lower portion of the outer fixing portion 45 provided in the base portion 40 of the parking brake 32 for the right wheel. It is fixed through. In addition, the 1st outer wire 35 is comprised by the hollow member which consists of a synthetic resin which has flexibility.

  Further, a second outer wire (secondary wire) is connected to a lower portion of the outer fixing portion 45 provided in the base portion 40 of the parking brake 31 for the left wheel via a relay bolt 46 through which the second inner wire 34 is inserted. One end of the covering member 36 is fixed. On the other hand, the other end of the second outer wire 36 is connected to a relay bolt 46 in which the second inner wire 34 is inserted into the upper portion of the outer fixing portion 45 provided in the base portion 40 of the parking brake 32 for the right wheel. Is fixed through. Similarly to the first outer wire 35, the second outer wire 36 is also formed of a hollow member made of a synthetic resin having flexibility.

  Note that protective coil springs 38 for preventing excessive bending are externally fitted to both ends of the first outer wire 35 and the second outer wire 36, respectively.

  Hereinafter, the main part of the synchronous structure 30 which the parking brake 31 for left wheels and the parking brake 32 for right wheels operate | moves interlockingly is explained in full detail.

  As shown in FIGS. 3 and 5, in the open state α where the brake shoe 81 of the brake unit 80 is released from the main wheel 2, for example, the operation lever 56 on the left wheel parking brake 31 side is moved to the main wheel 2 side (rear side). 2), the second inner wire fixed to the lower fixing portion 52 as the lever portion 50 turns first. The other end of 34 is pulled toward the operation unit 70 side of the parking brake 31 for the left wheel. As a result, the upper fixing portion 51 on the right wheel parking brake 32 side to which one end of the second inner wire 34 is fixed is also pulled, and the lever portion 50 on the right wheel parking brake 32 side is also interlocked with the operation portion rotating shaft 41. Is rotated toward the corresponding main wheel 2 side (rear side) (rotates counterclockwise in FIG. 5).

  When both the left and right lever portions 50 rotate, the brake shoe 81 of the brake portion 80 moves in a direction approaching the main wheel 2 via the link portion 60 as the lever portion 50 rotates. That is, by operating the operation lever 56 on the left wheel parking brake 31 side, the brake unit 80 on the left wheel parking brake 31 side and the brake unit 80 on the right wheel parking brake 32 side are in the same direction with respect to the main wheels 2. Moving.

  As described above, when the brake shoe 81 moves toward the main wheel 2 by the rotation of both the left and right lever portions 50, the pressure contact where the brake shoe 81 is pressed against the main wheel 2 as shown in FIGS. State β is obtained. As a result, the rotation of the main wheel 2 is stopped and the parking brake is applied.

  In the pressure contact state β as shown in FIG. 4, the lever side pressure contact regulating surface 58 formed on the outer peripheral edge of the lever portion 50 and the brake portion side pressure contact formed on the outer peripheral edge of the brake portion 80. The hour regulating surfaces 88 are in contact with each other. Therefore, in the parking brake 31 for the left wheel in the pressure contact state β, the range of the rotation angle is restricted so that the lever portion 50 does not further rotate in the direction away from the main wheel 2.

  On the other hand, in order to release the pressure contact state β applied with the parking brake to the separation state α, for example, the operation lever 56 on the left wheel parking brake 31 side is rotated forward (in FIG. 4 and FIG. Rotate clockwise). Thereby, one end of the 1st inner wire 33 fixed to the upper side fixing | fixed part 51 with the rotation of the lever part 50 is pulled by the operation part 70 side of the parking brake 31 for left wheels. Accordingly, the lower fixing portion 52 on the right wheel parking brake 32 side to which the other end of the first inner wire 33 is fixed is pulled, and the lever portion 50 on the right wheel parking brake 32 side is also interlocked. It rotates forward about the operating portion rotation shaft 41.

  The brake shoe 81 of the brake unit 80 moves in the direction of separating from the main wheel 2 side by the above-described rotation mode. That is, by operating the operation lever 56 on the left wheel parking brake 31 side, the brake unit 80 on the left wheel parking brake 31 side and the brake unit 80 on the right wheel parking brake 32 side are in the same direction with respect to the main wheel 2. Moving. As shown in FIGS. 3 and 5, a release state α in which the brake shoe 81 of the brake unit 80 is released from the main wheel 2 is obtained. Thereby, the main wheel 2 becomes rotatable and the parking brake is released.

  The above-described synchronization structure 30 is also effective by operating the operation lever 56 on the right wheel parking brake 32 side. If the operation lever 56 on the right wheel parking brake 32 side is operated, when the pressure contact state β is established, the other end of the first inner wire 33 is pulled and the lever portion 50 on the left wheel parking brake 31 side is pulled. It will rotate in conjunction. When the pressure contact state β is changed to the separated state α, one end of the second inner wire 34 is pulled, and the lever portion 50 on the left wheel parking brake 31 side is rotated in conjunction with it.

  Since the inner wires 33 and 34 are covered with the outer wires 35 and 36 between the base portions 40, the operation lever 56 is operated in the section from the left wheel parking brake 31 to the right wheel parking brake 32. It can suppress that another member interferes with the inner wires 33 and 34 which operate | move.

  In addition, the synchronization structure 30 is composed of a plate member (base component) that the base portion 40 is detachably attached to the brake attachment plate 29 of the wheelchair 1, so that it can be newly assembled to an existing wheelchair as a parking brake unit body. Or can be exchanged.

  For example, the one side fixing portion and the other side fixing portion do not need to be provided in the vertical direction with respect to the operation portion rotation shaft 41, and any one of the inner wires 33, 34 is associated with the rotation of the lever portion 50. If it is the structure which is pulled, for example, you may provide in the front-back direction on the basis of the operation part rotation shaft 41.

  Further, the fixing structure of the end portions of the inner wires 33 and 34 is not limited to the above embodiment. For example, both the upper fixing portion 51 and the lower fixing portion 52 may be attached so as to be rotatable about an axis parallel to the axial direction of the operation portion rotating shaft 41. Alternatively, both may be fixed so that the angle cannot be changed.

  The shape of the operation lever 56 is not particularly limited. For example, the operation lever 56 may be set to a long length that enables a brake operation with as little force as possible, or adopts a link synchronization structure that can be operated with a small force, and is compact. It is good also as the dimension shape of the operation lever 56 which is easy. Further, the shape of the lever portion 50 can be changed as appropriate. For example, the shape of the lever portion 50 may be a bent shape or a linear shape.

  Moreover, the synchronous structure 30 is not limited to the case where it is applied to the wheelchair 1 of the above-described embodiment, and may be applied to a structure having wheels such as a walking assistance vehicle and a baby carriage.

DESCRIPTION OF SYMBOLS 1 Wheelchair 2 Main wheel 3 Rotating shaft part 10 Wheelchair main body 10A Left side frame 10B Right side frame 11 Base frame part 12 Rear leg frame part 13 Back frame part 15 Seat frame part 25 Front frame 26 Caster 27 Foot frame 28 Footrest 29 Brake mounting plate 30 Parking brake synchronization structure 31 Left wheel parking brake 32 Right wheel parking brake 33 First inner wire (first connecting member)
34 Second inner wire (second connecting member)
35 First outer wire (first covering member)
36 Second outer wire (second covering member)
38 Protection coil spring 40 Base part (base part)
41 Operation part rotating shaft 42 Brake part rotating shaft 45 Outer fixing part 47 Swivel pin 48 Fixing pin 50 Lever part 51 Upper side fixing part (one side fixing part)
52 Lower side fixing part (other side fixing part)
55 Lever part side link shaft 56 Operation lever 57 Lever part side opening restriction surface 58 Lever part side pressure contact restriction surface 60 Link part 65 Brake part side link shaft 70 Operation part 80 Brake part 81 Brake shoe 87 Brake part side opening restriction Surface 88 Restriction surface during brake side pressure contact α Disengaged state β Pressure contact state

Claims (2)

A synchronizing structure of a parking brake used for a pair of left and right wheels attached to a wheelchair body of a wheelchair,
A pair of left and right base portions provided in positions adjacent to the wheels in the wheelchair main body, and each having an operation portion rotation axis defined;
It is attached to the base part so as to be rotatable about the operation part rotation axis, and has one side fixing part on one side with respect to the operation part rotation axis, and is fixed on the other side. A pair of left and right operation parts having a part;
A direction that is connected to the operation unit and moves in the direction of the wheel corresponding to the rotation direction of the operated operation unit to press the wheel and stop the wheel, or to separate from the wheel A pair of left and right brake parts that allow the wheels to rotate freely by moving to
Comprising
Furthermore, a first connecting member that connects one side fixing part of one operating part and the other side fixing part of the other operating part among the pair of left and right operating parts;
A second connecting member for connecting the one side fixing portion of the other operation portion and the other side fixing portion of the one operation portion;
A first covering member covering at least a part of the first connecting member;
A second covering member covering at least a part of the second connecting member;
With
Each one end of the first compound member and the second covering member is fixed to the one base member,
Each other end of the first compound member and the second covering member is fixed to the other base member,
When one of the operating parts is operated and one of the brake parts corresponding to the operating part moves relative to the corresponding wheel, any one of the first connecting member and the second connecting member is moved together therewith. Is pulled toward the one operation portion, the other operation portion rotates in conjunction with the other brake portion, and the other brake portion corresponding to the operation portion is also Move in the same direction,
When the other operation part is operated and the other brake part corresponding to the operation part moves with respect to the corresponding wheel, any one of the first connection member and the second connection member is moved together therewith. Is pulled toward the other operation portion, the one operation portion is rotated in conjunction with the other operation portion, and one brake portion corresponding to the operation portion is also connected to the other brake portion with respect to the corresponding wheel. A parking brake synchronization structure characterized by moving in the same direction. A parking brake unit body comprising the parking brake synchronization structure according to claim 1,
A parking brake unit body, wherein the base part is constituted by a base part that is detachably attached to a wheelchair body.

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