JP5907822B2 - wheelchair - Google Patents

Description

  The present invention relates to a wheelchair that prevents a wheelchair itself from being pushed backward by a user's action when a standing user tries to sit down or stands up from a seated state. is there.

  Conventionally, when a standing user tries to sit down or stands up from a seated state, the wheelchair itself is prevented from being pushed backward and moved by the movement of the user. A configuration has been proposed (see, for example, Patent Documents 1 and 2).

JP 2010-187882 A JP 2009-297165 A

  However, the configurations disclosed in Patent Documents 1 and 2 have a problem in that the manufacturing cost is high because the mechanisms for making the main wheel unrotatable in a state where the user is not seated are complicated, and there is a failure. In some cases, the system did not operate smoothly.

  For example, in the configuration according to Patent Document 1, a locking mechanism is configured by meshing between the gear portion and the meshing portion. If the meshing accuracy is low and there is a problem, the main wheel is not properly locked. Moreover, although the structure which a pin fits into the hole drilled in the gear part is also disclosed, if the accuracy of this fitting is low and there is a problem, the main wheel may not be locked. Further, although a mechanism in which a locking mechanism is configured using friction between rubber members is disclosed, there is a problem that the main wheel is not likely to be locked due to wear of the rubber member.

  In addition, the configuration according to Patent Document 2 includes a stopper having two protrusions, and the spoke part of the main wheel is inserted between the protrusions of the stopper, whereby the spoke part is brought into contact with the protrusion to be main. Since the structure prevents the wheels from rotating, high precision is required for the design of the gap size and shape between the protrusions, and the locked state of the main wheel cannot be obtained stably or even though it is locked. There are problems such as the main wheels rattling back and forth.

  Therefore, an object of the present invention is to provide a wheelchair that can surely prevent a user from moving backward due to a user's action when the user tries to sit down or the like with a simple structure. .

The present invention is a wheelchair provided with a main wheel and a seating portion, and when the user leaves the seating portion, the rotation of the main wheel to the rear is braked, and the main wheel and the seating portion Is provided with a seating detection member having an upper end portion disposed at a position facing directly below the seating portion, and the seating detection member according to a load when a user is seated on the seating portion. When pushed into a position below the upper end provided with a high becomes inelastic transmission member, also in the periphery of the main wheel definitive to the body frame, according to the load when the user sits on the seating unit, the normal position Alternatively, a movable base member that converts the position to a brakeable position is attached, and a rotation portion is set at the center of the movable base member, and the transmission member is disposed on one side with the rotation portion as a center. the lower end is disposed further Around the the pivoting portion of the movable base member on the other side, with the braking cam member is rotatably mounted, it is urging means for urging the movable base member to said braking enabled position When the user is seated on the seat, the seating detection member is pushed downward according to the load , and the movable base member is biased by the biasing means via the transmission member . The braking cam member and the main wheel are separated from each other, and when the user moves away from the seating portion, the downward pressing force on the seating detection member is released, and the When the movable base member becomes a brakeable position according to the urging force of the urging means, the main body portion of the braking cam member comes into pressure contact with the outer peripheral surface of the main wheel, and the main wheel starts to rotate backward, the braking The cam member is facing forward while in contact with the main wheel By rotating a wheelchair the protrusion of the braking cam member is pressed against the outer peripheral surface of the main wheel, rearward rotation of the main wheel, characterized in Rukoto such is braked.

  In this configuration, when the main body formed around the rotation shaft of the braking cam member is in contact with the outer peripheral surface of the main wheel, the main wheel starts to rotate rearward unintentionally. The braking cam member starts to rotate forward due to the frictional resistance generated between the braking cam member and the main wheel. This time, the protruding portion of the braking cam member comes into contact with the outer peripheral surface of the main wheel, and the protruding portion is in a state of being strongly pressed against the main wheel. Then, since the rotation of the main wheel is prevented and the braking state of the main wheel is obtained, the wheelchair is reliably prevented from moving backward by the user's operation. Since the structure according to the present invention is a simple structure using a so-called cam, the manufacturing cost can be suppressed, and there is an advantage that the braking state can be stably obtained even in repeated use.

  And a brake release means having a release lever disposed on a handle portion formed at an upper end of the main body frame, and a wire having one end connected to the release lever and the other end connected to the movable base member. And when the release lever of the brake release means is operated when the movable base member is in a brakeable position, the movable base member is in a normal position against the urging force of the urging means via the wire. A configuration in which the position is converted into a position is desirable.

  In such a configuration, when the user is not seated, the assistant operating the wheelchair operates the release lever to separate the braking cam member and the main wheel, thereby freely rotating the main wheel. It becomes possible to move. For this reason, the assistant can move the wheelchair freely and easily.

  Further, the main body frame has a structure in which a pair of left and right side frames are connected by an X frame so that the wheelchair can be folded, and the X frame is constituted by a rotating rod coupled to each other so as to be capable of mutual rotation. The lower end portion of the rotating rod is rotatably attached to the lower portions of the pair of left and right side frames, and the lower end portion of the rotating rod is rotated with the rotation of the lower end portion. A brake releasing cam portion that moves is formed, the brake releasing cam portion is in contact with a tilting member that rotates in synchronization with the movable base member, the user leaves the seating portion, and the wheelchair is folded. When the movable base member is not in the brakeable position, the brake release is released when the lower end of the X frame rotates in the closing direction and the lower end rotates with respect to the side frame. As the cam portion rotates, the tilting member rotates, and the movable base member moves accordingly. Dynamic and the normal position configuration is desirable.

  With this configuration, when the folding rod of the X frame is rotated and the movable base member is in the normal position when folded, the braking cam member is separated from the main wheel. Therefore, when the wheelchair is folded, the main wheel can freely rotate, so that the wheelchair can be moved freely and easily.

  The wheelchair of the present invention has a simple structure, and has an effect of preventing the wheelchair from moving backward due to the user's action when the user tries to sit on the wheelchair.

Side view of a wheelchair. Explanatory drawing which shows the rotation shaft part periphery of a main wheel from back. Explanatory drawing which shows the periphery of the main wheel which is in the state which can be braked at the time of non-seating from a side. Explanatory drawing which shows the main wheel periphery at the time of seating from a side. Explanatory drawing which shows from the side the periphery of the main wheel which is in a braking state when not seated. Explanatory drawing which shows the movable base board periphery at the time of folding.

  Hereinafter, the embodiment which materialized the wheelchair 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 main body frame 10 made of a metal pipe.

  The main body frame 10 includes a pair of left and right side frames 10A and 10A. The side frame 10A includes a base frame portion 11 formed in the front-rear direction, a rear leg frame portion 12 rising from the base frame portion 11, a back frame portion 13 extending further upward from the rear leg frame portion 12, and It has a seat frame portion 15 that extends forward and horizontally from the upper end portion of the rear leg frame portion 12.

  Further, the rear leg frame portion 12 is provided with a rotating shaft portion 3 of the main wheel 2 on which an elastically deformable tire is mounted. Further, a handle portion 14 for an assistant to operate the wheelchair 1 is formed at the upper end of the back frame portion 13. Furthermore, a release lever 51 of a brake release means 50 described later is disposed on the handle portion 14.

  As shown in FIGS. 1 and 2, the side frames 10 </ b> A and 10 </ b> A are connected by a pair of front and rear X frames 20 and 20. The X frame 20 is composed of pivot rods 21 and 21 that are coupled to each other at the center, and the lower end of the pivot rod 21 is pivotally attached to the base frame portion 11. Further, in the pair of front and rear X frames 20, 20, an upper side bar 22 arranged along the front-rear direction is passed to the upper end of each rotary bar 21.

  A seat cloth 25 is bridged between the pair of left and right upper ridges 22 and 22. And the seat part 4 which a user can seat is comprised by this upper side collar 22 being supported by the collar receiver 16 provided in the said seat frame part 15. As shown in FIG.

  In addition, the wheelchair 1 moves backward when a standing user tries to sit on the wheelchair 1 or when a seated user stands up. A mechanism for preventing this is provided. Details will be described below.

  A supporting tongue piece 15A is provided in the middle portion of the seat frame portion 15 so as to extend downward. The supporting tongue piece portion 15A has a horizontally long movable plate when the wheelchair 1 is viewed from the side. 30 is attached to be rotatable in the front-rear direction.

  As shown in FIG. 3 and the like, a rotating portion 31 in which a rotating shaft is arranged is set at the center of the movable plate 30, and one side with respect to the rotating portion 31 (FIG. 3 and the like). In FIG. 1, a seating detection member 32 is disposed, and an upper end of a transmission member 34 made of a piano wire is disposed on the other side (left side in FIG. 1 and the like). Further, a biasing means 35 comprising a torsion coil spring for biasing the movable plate 30 in the forward rotation direction is disposed on the rotating portion 31 of the movable plate 30.

  The seating detection member 32 is formed of a substantially T-shaped member in a side view, and is arranged at a position where the wide upper end portion faces directly below the seat cloth 25 constituting the seating portion 4.

  Further, a penetrating attachment hole 36 is formed at the center upper portion of the movable plate 30, and the lower end of the wire 52 connected to the release lever 51 of the brake release means 50 is connected to the attachment hole 36. ing.

  Further, the base frame portion 11 is provided with a supporting tongue piece portion 11A that is extended downward. When the wheelchair 1 is viewed from the side, the supporting tongue piece portion 11A has a horizontally long movable base plate 40 ( A movable base member) is attached to be rotatable in the front-rear direction.

  In the center of the movable base plate 40, there is set a rotation portion 41 on which a rotation shaft is arranged, and the transmission member is arranged on one side (right side in FIG. 3 and the like) with the rotation portion 41 as a center. The lower end of 34 is disposed. On the other hand, a braking cam member 43 is attached to the other side (left side in FIG. 3 and the like) so as to be rotatable in the front-rear direction. The rotating portion 41 of the movable base plate 40 is provided with a biasing means 45 made up of a torsion coil spring that biases the movable base plate 40 in the backward rotation direction. Further, an urging means 47 comprising a torsion coil spring for urging the braking cam member 43 in the backward rotation direction is disposed between the braking cam member 43 and the movable base plate 40.

  The braking cam member 43 is formed of a substantially cylindrical member that is tilted horizontally, and has an end surface that is not circular when the wheelchair 1 is viewed from the side. Specifically, it has a main body 43A formed around the rotation axis of the braking cam member 43, and a protrusion 43B formed to extend from the main body 43A.

  The braking cam member 43 is disposed so as to face in a direction orthogonal to the front surface of the main wheel 2 as shown in FIGS.

  The movable base plate 40 has a brakeable position tilted so that the transmission member 34 side is lowered as shown in FIG. 3, and a normal position tilted so that the brake cam member 43 side is lowered as shown in FIG. The position can be selectively changed.

  In the wheelchair 1 described above, as shown in FIG. 4, when the user X is seated on the seating portion 4, the seating detection member 32 is moved downward via a seatcloth 25 that is bent according to the load when seated. Accordingly, the movable plate 30 is rotated in the backward rotation direction, and the transmission member 34 side is raised. Then, via the transmission member 34, the movable base plate 40 is moved to the normal position where the braking cam member 43 side is at a low position in conjunction with the rotation so as to rotate in the forward rotation direction. Then, the braking cam member 43 is displaced in a direction away from the outer peripheral surface of the main wheel 2, so that the main wheel 2 can freely rotate without resistance. As a result, the seated user can operate by driving the main wheel 2 by himself / herself, or the assistant can freely operate and move the wheelchair 1 while the user is seated.

  On the other hand, when the user leaves the seating portion 4, the downward pressing force against the seating detection member 32 is released as shown in FIG. 3, and the movable plate 30 becomes substantially horizontal according to the biasing force of the biasing means 35. Accordingly, the movable base plate 40 becomes a brakeable position.

  Here, when the movable base plate 40 is in a brakeable position, the outer peripheral surface of the main body 43A of the braking cam member 43 is in pressure contact with the outer peripheral surface of the main wheel 2.

  And in the state where the movable base plate 40 as shown in FIG. 3 is in a brakeable position, for example, when the wheelchair 1 is pushed unintentionally by the user's action and the main wheel 2 starts to rotate backward, Due to the frictional resistance between the main wheel 2 and the braking cam member 43, the braking cam member 43 rotates in the forward rotation direction while contacting the main wheel 2 against the urging force of the urging means 47. Start to move. Then, as shown in FIG. 5, the protruding portion 43B of the braking cam member 43 is maintained with the separation distance between the rotation center of the braking cam member 43 and the rotation center of the main wheel 2 maintained. In this state, the outer peripheral surface of the main wheel 2 is pressed against the outer peripheral surface of the main wheel 2 and the protruding portion 43B bites into the tire portion of the main wheel 2. Then, the reverse rotation of the main wheel 2 is braked, and the backward movement of the wheelchair 1 is reliably prevented.

  In addition, since the said structure is a simple structure using what is called a cam, while being able to suppress manufacturing cost, there exists an advantage by which a braking state is obtained stably.

  Incidentally, as shown in FIG. 3, there is a case where it is desired to avoid the state where the braking cam member 43 is in contact with the main wheel 2 in order to easily move the wheelchair 1 when the user is not seated. In such a case, the release lever 51 of the brake release means 50 attached to the handle portion 14 is operated in the release direction. Specifically, the release lever 51 is tilted in a direction in which the wire 52 is pulled toward the handle portion 14 side. Then, the movable plate 30 rotates in the backward rotation direction via the wire 52 connected to the release lever 51, and in conjunction with this, the movable base plate 40 rotates in the forward rotation direction. The position is converted to the normal position. Therefore, since the braking cam member 43 is separated from the main wheel 2, the main wheel 2 can freely rotate and the wheelchair 1 can be moved easily. When the operation of the release lever 51 is released, the movable base plate 40 is interlocked and the braking cam member 43 returns to the original position.

  The wheelchair 1 is also provided with a mechanism that separates the braking cam member 43 and the main wheel 2 when the wheelchair 1 is folded.

  Hereinafter, in detail, as shown in FIG. 3, a lower rod 23 is passed to the lower end of each pivot rod 21 of the pair of front and rear X frames 20, 20, as shown in FIG. A braking release cam portion 60 having a non-circular front view is formed at the front end portion of the lower rod 23. The brake releasing cam portion 60 includes a main body portion 60A formed around the axis of the lower end portion of the rotary rod 21 formed by the lower rod 23, and a projecting portion 60B formed extending from the main body portion 60A. have.

  In addition, a tilting member 48 is attached to the inner side surface of the supporting tongue piece portion 11A that is pushed downward from the base frame portion 11 adjacent to the lower flange 23 so as to be rotatable in the front-rear direction. The tilting member 48 is a substantially inverted L-shaped member when viewed from the front, and is rotatable in synchronism with the movable base plate 40 arranged on the outside with respect to the supporting tongue piece 11A. A horizontal portion 49 formed in contact with the braking release cam portion 60.

  When the user is away from the seating portion 4 and the wheelchair 1 is not folded, as shown in FIGS. 6a and 6c, the main body portion 60A of the brake releasing cam portion 60 and the tilting member 48 The upper surface of the horizontal portion 49 comes into contact, and the movable base plate 40 becomes a brakeable position. That is, the braking cam member 43 is in pressure contact with the main wheel 2.

  On the other hand, in order to fold the wheelchair 1, as shown in FIGS. 6 b and 6 d, when the pivot rod 21 of the X frame 20 is pivoted in the closing direction and its lower end is pivoted with respect to the side frame 10 </ b> A. The braking release cam portion 60 also rotates, and the horizontal portion 49 of the tilting member 48 is pressed downward against the urging force of the urging means 45 by the protruding portion 60B of the braking release cam portion 60. The The tilting member 48 rotates in the forward rotation direction. Then, in conjunction with the tilting member 48, the movable base plate 40 is also rotated in the forward rotation direction, so that the braking cam member 43 and the main wheel 2 are separated from each other at the normal position.

  Therefore, when the wheelchair 1 is folded, the main wheel 2 can freely rotate, so that the wheelchair 1 can be moved freely and easily.

Note that the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the gist of the present invention.
For example, the main wheel 2 may be made of a plastic material whose outer peripheral surface is elastically deformable. The seating detection member 32 may have another shape, and may be formed of a bar whose upper end contacts the seat cloth 25. Moreover, although the above-mentioned seating detection member 32 is the structure which contacts the seat cloth 25 of the seating part 4 and detects the load at the time of sitting, for example, it contacts the upper side collar 22 and detects the load at the time of sitting. It may be a configuration. In addition, a large number of irregularities may be formed on the surface of the braking cam member 43 to increase the frictional resistance generated between the braking wheel member 43 and the main wheel 2, thereby improving safety.

DESCRIPTION OF SYMBOLS 1 Wheelchair 2 Main wheel 4 Seating part 10 Main body frame 10A Side frame 14 Handle part 20 X frame 21 Turning rod 40 Movable base plate (movable base member)
43 Brake cam member 45 Biasing means 48 Tilt member 50 Brake release means 51 Release lever 52 Wire 60 Brake release cam section

Claims (3)

A wheelchair comprising a main wheel and a seating portion, wherein when the user leaves the seating portion, rotation of the main wheel to the rear is braked;
The main body frame in which the main wheel and the seating portion are arranged is provided with a seating detection member having an upper end portion disposed at a position facing directly below the seating portion, and when the user is seated on the seating portion. When the seating detection member is pushed downward according to the load, a non-expandable transmission member is provided, the position of the upper end of which increases.
Further, wherein the periphery of the main wheel definitive to the body frame, according to the load when the user sits on the seating portion, and the movable base member is attached to position conversion to the normal position or braking possible position,
At the center of the movable base member, a rotation part is set, and the lower end of the transmission member is disposed on one side with the rotation part as a center,
Further, a braking cam member is rotatably attached to the other side of the movable base member with the pivoting portion as a center, and a biasing force is applied to bias the movable base member to the brakeable position. Means are connected,
When the user is seated on the seating portion, the seating detection member is pushed downward in accordance with the load , and the movable base member normally resists the biasing force of the biasing means via the transmission member. The braking cam member and the main wheel are separated,
On the other hand, when the user leaves the seating portion, the downward pressing force against the seating detection member is released, and the movable base member becomes a brakeable position according to the biasing force of the biasing means, and the braking cam member When the main body portion is in pressure contact with the outer peripheral surface of the main wheel and the main wheel starts to rotate backward, the braking cam member rotates forward while contacting the main wheel, and the braking cam member Wheelchair protrusions are pressed against the outer peripheral surface of the main wheel, rearward rotation of the main wheel, characterized in Rukoto such is braked. A brake release means having a release lever disposed on a handle portion formed at an upper end of the main body frame, a wire having one end connected to the release lever and the other end connected to the movable base member;
When the release lever of the brake release means is operated when the movable base member is in the brakeable position, the movable base member is positioned at the normal position against the urging force of the urging means via the wire. The wheelchair according to claim 1 to be converted. The main body frame has a structure in which a pair of left and right side frames are connected by an X frame so that the wheelchair can be folded. The lower end portion of the rotating rod is rotatably attached to the lower part of the pair of left and right side frames,
Further, a brake releasing cam portion that rotates as the lower end portion rotates is formed at the lower end portion of the rotating rod, and the brake releasing cam portion rotates in synchronization with the movable base member. In contact with the tilting member,
When the user leaves the seat and the wheelchair is not folded, the movable base member is in a brakeable position;
On the other hand, when the pivot rod of the X frame is pivoted in the closing direction to be folded and the lower end portion pivots with respect to the side frame, the tilting member pivots as the brake release cam portion pivots. Accordingly, the wheelchair according to claim 1 or 2, wherein the movable base member is rotated to the normal position.

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