JP2020092772A - Walker - Google Patents

Abstract

To prevent a walker from unintentionally moving by acting a prescribed amount or more of downward load on handles when a user seated on a chair, etc. stands up while gripping the handles.SOLUTION: A walker includes: a car body formed with frames extending in vertical direction; a pair of front wheels attached to a lower part of the car body; a pair of rear wheels 13 attached to the lower part of the car body via a pair of rear-wheel cases 18; and a pair of handles attached to the upper part of the car body. The walker further includes a pair of rear-wheel rotation control mechanisms 23 that, when the prescribed amount or more of downward load acts on the pair of handles, push the pair of rear wheels 13 relatively into the pair of rear-wheel cases 18 by the lowering of the pair of rear-wheel cases 18 to prevent rotation of the pair of rear wheels 13 and, when releasing the prescribed amount or more of downward load having acted on the pair of handles, project the pair of rear wheels 13 relatively from the pair of rear-wheel cases 18 by lift of the pair of rear-wheel cases 18 to allow the rotation of the pair of rear wheels 13.SELECTED DRAWING: Figure 1

Description

The present invention relates to a walking vehicle in which a user can stand up while holding a handle while sitting on a chair or the like and can walk while holding the handle.

Conventionally, there has been disclosed a walking vehicle having a pair of left and right rear wheels with a brake and at least one free front wheel in a lower portion and a handlebar in an upper portion and having a walking assist function (for example, Patent Document 1 ( See claims 1 and 2, paragraphs [0020], [0021], FIG. 1)). In this pedestrian, the center of a generally horizontal horseshoe-shaped handlebar is held at the upper end of a substantially vertical vertical frame, and the lower end of the vertical frame is extended forward by pivotally supporting a universal front wheel. The front frame portion and the horseshoe-shaped rear frame portion, which supports the rear wheel and which is provided with a seat and extends rearward, are fixed. Further, the brake is configured to be operated and locked via a brake cable by operating a brake lever installed at both ends of the handlebar.

In a walker configured in this way, a substantially horizontal horseshoe-shaped handlebar can be attached to the upper surface of the elbow to ensure that a considerable portion of the weight of the upper body can be borne, and appropriate braking action ensures safe and stable walking. Is possible. In addition, the brake is operated and locked via the brake cable by the operation of the brake levers installed on both ends of the handlebar, so that the weight of the upper half of the pedestrian of the user is burdened on the handlebar, and both ends of the handlebar are You can hold the brake lever and you can stop the pedestrian safely.

On the other hand, the pedestrian body includes a pair of left and right side frames each having wheels at its lower end, a seat portion disposed between the pair of left and right side frames, and a folding mechanism connected to each of the pair of left and right side frames. A pedestrian provided with a folding mechanism and configured to be foldable in the left-right direction is disclosed (see, for example, Patent Document 2 (Claim 1, paragraph [0016], [0022], FIG. 1)). In this walking vehicle, a pair of left and right shopping basket position restricting auxiliary members are arranged on the main body of the walking car, and each shopping basket position restricting auxiliary member is provided with a bottom portion and a position restricting convex portion projecting upward from the bottom portion. .. Further, with the shopping basket placed on the seat portion, the shopping basket is placed on the bottom of the pair of left and right shopping basket position regulation auxiliary members, and the side surface of each position regulation convex portion is at least one of the side peripheral walls of the shopping basket. The front and side movements of the shopping basket are regulated by facing each other. Further, a brake shoe that suppresses rolling of the rear wheels is pivotally attached to the rear frame, and a brake lever provided on the handle and a brake shoe are connected by a brake wire.

In the pedestrian configured as described above, the shopping basket can be placed on the seat, the shopping basket can be appropriately prevented from falling from the seat, and the trolley can be compactly folded when stored. .. In addition, the rear wheel can be braked by operating a brake lever provided on the handle.

JP, 2003-10269, A JP, 2017-6402, A

However, in the conventional pedestrian disclosed in Patent Document 1, when the user grips the handlebar of the pedestrian and stands up while sitting on a chair or the like, the user must grip the handlebar and the brake lever. , There was a problem that the pedestrian moved unintentionally. Further, in the above-described conventional walking vehicle disclosed in Patent Document 2, when the user grips the handle of the walking vehicle while standing up in a chair or the like and stands up, the user must walk the brake lever together with the handle when walking. There was a problem that the car moved unintentionally.

A first object of the present invention is that when a user grips a handle while standing on a chair or the like and stands up, a downward load of a predetermined amount or more acts on the handle, so that the walking vehicle is unintentionally It is to provide a pedestrian vehicle that can prevent movement. A second object of the present invention is that the rear wheel case can smoothly descend in a stable state against the elastic force of the compression coil spring, and the rear wheel case can smoothly move in a stable state by the elastic force of the compression coil spring. It is to provide a pedestrian vehicle that can climb.

A first aspect of the present invention is, as shown in FIGS. 1 and 2, a vehicle body 11 formed by frames 11a and 11b extending in a vertical direction, and a single body provided in a lower portion of the vehicle body 11 extending forward. Alternatively, a single or a pair of front wheels 12 and 12 attached to the tips of the pair of front legs 16 and 16, and a pair of rear wheels to the tips of a pair of rear legs 17 and 17 extending rearward at the lower portion of the vehicle body 11. Walking including a pair of rear wheels 13 and 13 rotatably mounted via cases 18 and 18, and a pair of handles 14 and 14 extending backward and mounted on an upper portion of the vehicle body 11 and held by a user. In the vehicle 10, the pair of rear wheels 13 and 13 are lowered by lowering the pair of rear wheel cases 18 and 18 when a downward load of a predetermined amount or more is applied to the pair of handles 14 and 14. , 18 to prevent relative rotation of the pair of rear wheels 13 and 13 and to release a downward load of a predetermined amount or more acting on the pair of handles 14 and 14 when the pair of rear wheels is released. A pair of rear wheel rotation control mechanisms for allowing the pair of rear wheels 13, 13 to relatively project from the pair of rear wheel cases 18, 18 by raising the pair of rear wheels 13, 18 to allow the pair of rear wheels 13, 13 to rotate. 23, 23 is further provided.

A second aspect of the present invention is the invention based on the first aspect, and further, as shown in FIGS. 1, 2, and 7, the rear wheel rotation control mechanism 23 is configured so that the rear wheel rotation control mechanism 23 is protruded at both ends. A rear shaft 24 that is inserted into the wheel 13 and is housed in the rear wheel case 18 to rotatably hold the rear wheel 13 or rotate together with the rear wheel 13, and both ends of the rear shaft 24 and the rear wheel case 18. A pair of elastic bodies 26, 26 which are respectively provided between the rear shafts 24 to urge the rear wheel case 18 in a direction to levitate the rear wheel case 18 to relatively project the lower portion of the rear wheel 13 from the rear wheel case 18; A pair of receiving plates 27, 27 attached to the lower surface of the rear wheel case 18 for receiving both ends of the rear shaft 24, and the rear wheel 13 are opposed to the rear wheel case 18 against the elastic force of the pair of elastic bodies 26, 26. It has a stopper 28 that abuts on the floor surface 25 when it is pushed in manually.

A third aspect of the present invention is the invention based on the second aspect, and further, as shown in FIG. 1, a pair of elastic bodies 26, 26 are constituted by a pair of compression coil springs, and a pair of compression coil springs. 26, 26 and a pair of receiving plates 27, 27, a pair of movable pieces 29, 29 are respectively interposed, and a pair of insertion holes 29a, 29a or insertion holes are formed in the pair of movable pieces 29, 29, respectively. Both ends of the rear shaft 24 are inserted into the pair of insertion holes 29a, 29a or the insertion holes, respectively.

A fourth aspect of the present invention is the invention based on the second aspect, and as shown in FIGS. 2 and 7, the pair of stoppers 28, 28 are formed in a block shape from synthetic rubber or plastic, The stoppers 28, 28 are attached to the lower surfaces of the pair of rear legs 17, 17 respectively.

In the walking vehicle according to the first aspect of the present invention, when the user grips the pair of handles and stands up while sitting on a chair or the like, if a downward load of a predetermined amount or more acts on the pair of handles, the rear wheel The rotation control mechanism lowers the pair of rear wheel cases to relatively push the pair of rear wheels into the rear wheel case and prevent the pair of rear wheels from rotating. As a result, when the user grips the handle and stands up, the pedestrian can be prevented from unintentionally moving, so that the user can stand up in a stable state. In addition, when the user stands up and the downward load of a predetermined amount or more acting on the pair of handles is released, the rear wheel rotation control mechanism raises the pair of rear wheel cases, and thus the pair of rear wheels. Is relatively projected from the rear wheel case to allow rotation of the pair of rear wheels. As a result, the user can walk in a stable state by gripping the handle of the walking vehicle.

In the walking vehicle according to the second aspect of the present invention, when a user holds a handle while standing up in a chair or the like and stands up, a downward load of a predetermined amount or more acts on the pair of handles, the pair of rear wheels. When the case descends against the elastic force of the pair of elastic bodies, the pair of rear wheels are relatively pushed into the pair of rear wheel cases, and the pair of stoppers abuts on the floor surface. The rotation of the rear wheels is blocked. As a result, when the user grips the handle and stands up, the pedestrian can be prevented from unintentionally moving, similarly to the above, so that the user can stand up in a stable state. Also, when the user stands up and the downward load of a predetermined amount or more acting on the pair of handles is released, the pair of rear wheel cases are respectively lifted by the elastic force of the pair of elastic forces, and the pair of rear wheels are lifted. The wheels relatively project from the pair of rear wheel cases and the pair of stoppers separate from the floor surface, so that the pair of rear wheels are allowed to rotate. As a result, similarly to the above, the user can walk in a stable state by gripping the handle of the walking vehicle.

In the walking vehicle according to the third aspect of the present invention, when the user grips the pair of handles and stands up while sitting on a chair or the like, if a downward load of a predetermined amount or more acts on the pair of handles, The rear wheel case moves downward against the elastic force of the pair of compression coil springs, whereby the pair of rear wheels is relatively pushed into the pair of rear wheel cases. At this time, both ends of the rear shaft are inserted into the pair of movable pieces, and the compression coil spring is pressed between these movable pieces and the rear wheel case, so that the rear wheel case resists the elastic force of the compression coil spring. And can descend smoothly in a stable state. Also, when the user stands up and the downward load of a predetermined amount or more acting on the pair of handles is released, the pair of rear wheel cases are respectively lifted by the elastic force of the pair of elastic forces, and the pair of rear wheels are lifted. The wheels relatively project from the pair of rear wheel cases. At this time, both ends of the rear shaft are inserted into the pair of movable pieces, and the compression coil spring is pressed against between the movable pieces and the rear wheel case, so that the rear wheel case is stabilized by the elastic force of the compression coil spring. You can smoothly rise in the state.

In the walking vehicle according to the fourth aspect of the present invention, the pair of stoppers are formed in a block shape with synthetic rubber or plastic, and the pair of stoppers are attached to the lower surfaces of the rear legs, respectively. Due to the large frictional resistance, the rotation of the rear wheels is blocked, and the unintentional movement of the pedestrian can be prevented.

(A) is the sectional view on the AA line of FIG. 3 which shows the state where the rear wheel of the pedestrian of this invention protruded from the rear wheel case, (b) shows the rear wheel relatively in a rear wheel case. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 showing a state of being pushed in. It is a perspective view of the pedestrian. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. FIG. 5 is a view on arrow D in FIG. 4. FIG. 3 is an exploded perspective view of a rear wheel case and members such as a rear wheel that are housed or attached to the rear wheel case. It is a side view of the pedestrian. It is a front view of the pedestrian. It is a top view of the pedestrian.

Next, a mode for carrying out the present invention will be described based on the drawings. As shown in FIGS. 2, 7 and 8, a walking vehicle 10 includes a vehicle body 11 formed by frames 11a and 11b extending in a vertical direction, and a pair of front wheels 12 and 12 attached to a lower front portion of the vehicle body 11. And a pair of rear wheels 13 and 13 attached to the lower rear of the vehicle body 11, and a pair of handles 14 and 14 attached to the upper portion of the vehicle body 11 so as to extend rearward. The vehicle body 11 includes a tall first frame 11a formed by bending a metal pipe into a substantially inverted U shape, and a short second frame 11b formed by bending a metal pipe into a substantially inverted U shape. It is formed by connecting the frames 11a and 11b with bolts and nuts (not shown). Examples of the metal pipes include magnesium alloy pipes, carbon pipes, steel pipes, aluminum alloy pipes, stainless steel pipes, polypropylene (PP) resin pipes, acrylonitrile butadiene styrene (ABS) resin pipes, Examples thereof include nylon resin pipes, polyester resin pipes, and elastomer resin pipes.

The pair of front wheels 12 and 12 are rotatably attached to the tips of the pair of front legs 12 and 12 that are provided on the lower portion of the vehicle body 11 and extend forward (FIGS. 2 and 7 to 9 ). As a result, the pair of front wheels 12, 12 are provided with a space left and right, respectively. Specifically, a pair of front legs 16 and 16 are formed by bending both lower end portions of the inverted U-shaped first frame 11a forward and extending forward, respectively, and a pair of front legs 16 and 16 is formed at the front ends of the front legs 16 and 16, respectively. The pair of front wheels 12 and 12 are attached via the first attachments 21 and 21 and the pair of second attachments 22 and 22, respectively (FIGS. 2, 7, and 8). Here, the front wheel 12 is rotatably attached to the second fixture 22 about a horizontal shaft (not shown) extending in the horizontal direction, and the vertical shaft 22a is directed upward on the upper surface of the front portion of the second fixture 22. Is projected. The second fixture 22 is attached to the first fixture 21 via a vertical shaft 22a, and is configured to rotate about the vertical shaft 22a. Further, the extension line of the vertical shaft 22a is configured to intersect with the extension line of the horizontal shaft in a three-dimensional manner, so that the turning performance of the walking vehicle 10 can be improved.

The pair of rear wheels 13 and 13 are rotatably attached to the tips of a pair of rear legs 17 and 17 that are provided on the lower portion of the vehicle body 11 so as to extend rearward (FIGS. 2 and 7 to 9). As a result, the pair of rear wheels 13 and 13 are provided with a space left and right. Specifically, a pair of rear legs 17 and 17 are formed by bending both lower end portions of the inverted U-shaped second frame 11b rearward and extending rearward, respectively. A pair of rear wheels 13 and 13 are rotatably attached to the ends via a pair of rear wheel cases 18 and 18, respectively (FIGS. 2, 7, and 8). A horizontal hole 18a extending rearward is formed in the front surface of the rear wheel case 18 (FIGS. 4 and 6), and the rear end portion of the rear leg 17 is inserted into the horizontal hole 18a (FIGS. 2, 4, and 6). 6 and FIG. 7). Further, a pair of rear wheel rotation control mechanisms 23, 23 are provided between the pair of rear wheel cases 18, 18 and the pair of rear wheels 13, 13, respectively (FIGS. 1, 3, and 6). These rear wheel rotation control mechanisms 23, 23 lower the pair of rear wheel cases 18, 18 when a downward load of a predetermined amount or more acts on the pair of handles 14, 14, thereby lowering the pair of rear wheel 13, 13 is relatively pushed into the pair of rear wheel cases 18, 18 to prevent the pair of rear wheels 13, 13 from rotating (FIG. 1(b)), and a predetermined amount acting on the pair of handles 14, 14. When the above-mentioned downward load is released, the pair of rear wheel cases 18, 18 are raised to cause the pair of rear wheel cases 13, 18 to relatively project from the pair of rear wheel cases 18, 18 and It is configured to allow the rotation of the wheels 13 and 13 (FIG. 1A).

Specifically, each rear wheel rotation control mechanism 23 is inserted into the rear wheel 13 so that both ends thereof project and is housed in the rear wheel case 18, and a rear shaft 24 that holds the rear wheel 13 rotatably, The lower part of the rear wheel 13 is moved from the rear wheel case 18 to the rear wheel case 18 by urging the rear shaft 24 in a direction in which the rear wheel case 18 is levitated. A pair of compression coil springs 26, 26 that project relatively, a pair of receiving plates 27, 27 attached to the lower surface of the rear wheel case 18 to receive both ends of the rear shaft 24, and a pair of compression coil springs for the rear wheel 13. And a stopper 28 that abuts on the floor surface 25 when pushed relatively to the rear wheel case 18 against the elastic force of 26, 26 (FIGS. 1, 3, and 6). Moreover, in this embodiment, a pair of movable pieces 29, 29 are respectively interposed between the pair of compression coil springs 26, 26 and the pair of receiving plates 27, 27 (FIG. 1).

A recess 18b that can accommodate the rear wheel 13 in an upright state is formed in the center of the rear wheel case 18 in the width direction of the rear lower surface of the rear wheel case 18 (FIGS. 1, 3, and 4). A pair of vertical holes 18c, 18c are formed on the lower surface of the rear portion of the rear portion 18 so as to sandwich the recess 18b, respectively (FIGS. 1 and 3). Further, a pair of notches 18d and 18d into which the rear shaft 24 can be loosely inserted are formed in a pair of walls between the recess 18b and the pair of vertical holes 18c and 18c, respectively, and the lower portion of the vertical hole 18c to the central portion. A pair of recessed strips 18e, 18e are formed in each of the two so as to face each other. On the outer peripheral surface of the movable piece 29, the rear shaft 24 can be inserted in the horizontal direction and the rear shaft 24 can be inserted, and the insertion hole 29a (FIGS. 1, 3 and 6) whose front end is closed, and the center line of the insertion hole 29a. And a pair of ridges 29b, 29b (FIGS. 3 and 6) that are located in a direction orthogonal to each other and extend in the vertical direction. When the movable piece 29 is vertically movably inserted into the vertical hole 18c, the pair of convex stripes 29b and 29b of the movable piece 29 are slidably inserted into the pair of concave stripes 18e and 18e of the vertical hole 18c. This prevents the movable piece 29 from rotating in the vertical hole 18c, so that the movable piece 29 can smoothly move up and down in the vertical hole 18c.

A slide bearing 31 is inserted into the through hole 13a of the rear wheel 13, the rear shaft 24 is rotatably inserted into the through hole 31a of the slide bearing 31, and the both ends of the rear shaft 24 have a pair of movable pieces 29, They are inserted into the insertion holes 29a, 29a of 29 respectively (FIGS. 1 and 3). Further, the pair of vertical holes 18c, 18c are inserted with the pair of compression coil springs 26, 26, and then the pair of movable pieces 29, 29 with both ends of the rear shaft 24 inserted into the insertion holes 29a, 29a. The lower surfaces of the pair of vertical holes 18c, 18c are closed by the pair of receiving plates 27, 27 (FIG. 1). As a result, the pair of compression coil springs 26, 26 pushes down both ends of the rear shaft 24 via the pair of movable pieces 29, 29 so that the lower portion of the rear wheel 13 projects relatively from the rear wheel case 18, and The receiving plates 27, 27 are configured to receive both ends of the rear shaft 24 via a pair of movable pieces 29, 29. The pair of stoppers 28, 28 are made of a relatively soft plastic such as polypropylene (PP), acrylonitrile butadiene styrene (ABS), nylon, polyester, elastomer, etc., and are formed in a substantially rectangular block shape (FIG. 2). 7 and 8). The pair of stoppers 28, 28 are attached to the front lower surfaces of the pair of rear legs 17, 17, respectively. The height of the pair of stoppers 28, 28 is set when the pair of rear wheels 13, 13 is relatively pushed into the pair of rear wheel cases 18, 18 against the elastic force of the pair of compression coil springs 26, 26. Is set so as to contact the floor surface 25. The large frictional resistance of the stoppers 28, 28 to the floor surface 25 prevents the pair of rear wheels 13, 13 from rotating. Further, the pair of handles 14, 14 are attached to the upper portions of the pair of upright portions 11c, 11c of the first frame 11a so as to extend rearward, and are gripped by the user of the walking vehicle 10.

The elastic force of the pair of compression coil springs 26, 26 acts on the walking vehicle 10 when the user of the walking vehicle 10 stands up while holding the pair of handles 14, 14 while sitting on a chair or the like. A downward load of a certain amount or more, that is, a relatively large predetermined amount or more that acts on the pair of compression coil springs 26, 26 (for example, a load that requires a reliable stopper: 10 kg or more, preferably 10 kg to 30 kg). With respect to the load, the pair of rear wheel cases 18 and 18 are lowered until the pair of stoppers 28 and 28 come into contact with the floor surface 25, but the user grips the pair of handles 14 and 14 while standing. For a relatively small downward load acting on the pedestrian 10 while walking, that is, a relatively small downward load acting on the pair of compression coil springs 26, 26, a pair of rear wheel cases 18, 18 is provided. Is set within a range that hardly lowers. Reference numeral 29c in FIGS. 1 and 6 is a disc-shaped projection formed on the upper surface of the movable piece 29 and into which the lower end of the compression coil spring 26 can be fitted. Reference numeral 29d in FIG. 1 denotes a disc-shaped recess formed on the lower surface of the movable piece 29, and reference numeral 27a in FIGS. 1 and 6 denotes the lower surface of the movable piece 29 formed on the upper surface of the receiving plate 27. It is a protrusion that can be fitted into the recess 29d. Further, reference numeral 32 in FIG. 6 is a closing plate that closes the front lower surface of the rear wheel case 18 to the central lower surface. Further, reference numeral 34 in FIGS. 2, 7 and 8 denotes a table attached through a pair of stays 33, 33 at approximately the center in the height direction of the pair of upright portions 11c, 11c of the first frame 11a. Is. The table 34 is configured to be switchable between a use position in which it projects forward and is held in a horizontal state, and a storage position in which it is held in a standing state between the pair of standing portions 11c, 11c of the first frame 11a. It Further, reference numeral 36 in FIGS. 1, 3 and 6 is a plain washer fitted into the rear shaft 24 so as to contact the end surface of the rear wheel 13.

A method of using the walking vehicle 10 thus configured will be described. When the user of the walking vehicle 10 sits on a chair or the like and tries to stand up while holding the pair of handles 14, 14 of the walking vehicle 10, a relatively large downward load of a predetermined amount or more is applied to the pair of handles 14, 14. Works. At this time, the pair of rear wheel cases 18, 18 are lowered respectively against the elastic forces of the pair of compression coil springs 26, 26, so that the pair of rear wheels 13, 13 are moved to the pair of rear wheel cases 18, 18. When pushed in relatively (FIG. 1(b)), the pair of stoppers 28, 28 contact the floor surface 25. At this time, both ends of the rear shaft 24 are inserted into the pair of movable pieces 29, 29, and the pair of compression coil springs 26, 26 are pressed against each other between the movable pieces 29, 29 and the rear wheel case 18. The rear wheel case 18 can descend in a stable state against the elastic force of the pair of compression coil springs 26, 26. Further, when the pair of stoppers 28, 28 come into contact with the floor surface 25, the large frictional resistance of the stoppers 28, 28 to the floor surface 25 prevents the pair of rear wheels 13, 13 from rotating. As a result, when the user grips the pair of handles 14, 14 and stands up, the pedestrian 10 can be prevented from unintentionally moving, so that the user can stand up in a stable state.

On the other hand, when the user of the walking vehicle 10 stands up, the downward load of a predetermined amount or more acting on the pair of handles 14, 14 is released. At this time, the pair of rear wheel cases 18 and 18 are lifted by the elastic forces of the pair of compression coil springs 26 and 26, respectively, and the pair of rear wheel cases 13 and 13 are relatively moved from the pair of rear wheel cases 18 and 18, respectively. The pair of stoppers 28, 28 are projected (FIG. 1A) and separated from the floor surface 25 (FIGS. 2, 7, and 8). At this time, both ends of the rear shaft 24 are inserted into the pair of movable pieces 29, 29, and the pair of compression coil springs 26, 26 are pressed against each other between the movable pieces 29, 29 and the rear wheel case 18. The rear wheel case 18 can be smoothly raised in a stable state by the elastic force of the pair of compression coil springs 26, 26. Further, when the pair of stoppers 28, 28 separate from the floor surface 25, the pair of rear wheels 13, 13 are allowed to rotate. As a result, the user can walk in a stable state by gripping the pair of handles 14, 14 of the walking vehicle 10.

In the above embodiment, the pair of front wheels are attached to the tips of the pair of front legs extending forward of the vehicle body, but a single front wheel may be attached to the tips of a single front leg extending forward of the vehicle body. In the above embodiment, the compression coil spring is used as the elastic body that urges the rear shaft in the downward direction, but an elastic body such as a tension coil spring, a torsion coil spring, or a leaf spring may be used. Further, in the above embodiment, the slide bearing is inserted into the through hole of the rear wheel, but the rolling bearing may be inserted into the through hole of the rear wheel. Further, in the above-described embodiment, the slide bearing is inserted into the insertion hole of the rear wheel, the rear shaft is inserted into the through hole of the slide bearing, and both ends of the rear shaft are inserted into the insertion holes of the pair of movable pieces. As a result, the rear shaft rotatably holds the rear wheel, but slide bearings or rolling bearings are inserted into the insertion holes of the pair of movable pieces, respectively, and the rear shaft is inserted into the insertion hole of the rear wheel. By inserting both ends of the rear shaft into the through holes of the pair of plain bearings, the pair of movable pieces may rotatably hold the rear shaft together with the rear wheel through the pair of bearings.

Further, in the above-described embodiment, the pair of movable pieces are respectively interposed between the pair of compression coil springs and the pair of receiving plates, and the pair of compression coil springs are provided at both ends of the rear shaft via the pair of movable pieces. The lower part of the rear wheel is relatively projected from the rear wheel case, and the pair of receiving plates receives both ends of the rear shaft through the pair of movable pieces. Alternatively, the pair of compression coil springs may directly push down both end portions of the rear shaft so that the lower portion of the rear wheel projects relatively from the rear wheel case, and the pair of receiving plates directly receive both end portions of the rear shaft. .. Further, in the above-described embodiment, the movable piece is provided with the insertion hole in which the rear shaft can be inserted and the front end is closed, but the movable piece is provided with the insertion hole in which the rear shaft can be inserted and the front end is opened. It may be formed.

10 Pedestrian 11 Body 11a First frame (frame)
11b Second frame (frame)
12 front wheel 13 rear wheel 14 handle 16 front leg 17 rear leg 18 rear wheel case 23 rear wheel rotation control mechanism 24 rear shaft 25 floor surface 26 compression coil spring (elastic body)
27 Support plate 28 Stopper 29 Movable piece 29a Insertion hole

Claims (4)

A vehicle body formed by a frame extending in the vertical direction, a single or a pair of front wheels attached to the front ends of a single or a pair of front legs provided at a lower portion of the vehicle body, and a lower portion of the vehicle body. A pair of rear wheels rotatably attached to the front ends of a pair of rear legs extending rearward through a pair of rear wheel cases, and a pair of rear wheels extending rearwardly attached to the upper part of the vehicle body and gripped by a user In a walking vehicle equipped with a pair of handles that
When a downward load of a predetermined amount or more is applied to the pair of handles, the pair of rear wheel cases is lowered to relatively push the pair of rear wheels into the rear wheel case and Relative to the pair of rear wheels from the rear wheel case by raising the pair of rear wheel cases when a downward load of a predetermined amount or more acting on the pair of handles is released. A pedestrian further comprising: a pair of rear wheel rotation control mechanisms that allow the pair of rear wheels to rotate by projecting themselves. The rear wheel rotation control mechanism is inserted into the rear wheel such that both ends of the rear wheel protrude and is housed in the rear wheel case to rotatably hold the rear wheel or to rotate with the rear wheel. , The lower part of the rear wheel from the rear wheel case is provided between the both ends of the rear shaft and the rear wheel case by urging the rear shaft in a direction to levitate the rear wheel case. A pair of elastic bodies that project relatively, a pair of receiving plates that are attached to the lower surface of the rear wheel case and that receive both ends of the rear shaft, and the rear wheel resists the elastic force of the pair of elastic bodies. The walking vehicle according to claim 1, further comprising a stopper that comes into contact with a floor surface when being pushed relatively into the rear wheel case. The pair of elastic bodies are composed of a pair of compression coil springs, a pair of movable pieces are respectively interposed between the pair of compression coil springs and the pair of receiving plates, and a pair of insertion pieces are inserted into the pair of movable pieces. The walker according to claim 2, wherein holes or insertion holes are formed respectively, and both ends of the rear shaft are inserted into the pair of insertion holes or insertion holes, respectively. The walking vehicle according to claim 2, wherein the pair of stoppers are formed in a block shape from synthetic rubber or plastic, and the pair of stoppers are attached to the lower surfaces of the pair of rear legs, respectively.

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