Shock absorber for hand-pushed vehicles, and hand-pushed vehicles with shock absorbers

Abstract

To provide a shock absorber that allows a wheelchair to move smoothly, solving the problem with a conventional wheelchair that in ascending or descending on stairs or moving on steps by a wheelchair, the balance is temporarily unstable when shifting from front wheel landing to rear wheel landing, and great shock is generated in landing so that the wheelchair cannot move smoothly.SOLUTION: A box plate shaped buffer (1) formed spreading planarly with the same width as a seat surface width (SCW) below a seat surface (SC) of a travelling vehicle between front and rear travelling shafts (W1, W2) of a hand-pushing travelling vehicle and between right and left travelling wheels (W2 / W1) is fixed and supported at a hollow position above a landing line (WL) of the front and rear travelling shafts (W1,W2). On the undersurface of the buffer (1), a buffer surface made of an elastic material is formed with a convex surface line (11TL) substantially parallel to or substantially inclined to the landing line (WL) as a hollow position. On the buffer surface, continuous convex parts (11) arranged in the front-back direction and in the right-left direction are formed in the plane.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to an impact cross-section device for push-type vehicles such as wheelchairs, strollers, walkers, and carts that are manually operated by an operator. It also relates to push-type vehicles such as wheelchairs, strollers, walkers, and carts that are equipped with this device. In particular, it relates to a four-wheeled push-type vehicle for passenger carriages that can carry people or animals, with two wheels at the front and two at the back, for a total of four wheels. [Background technology]

[0002] When going up or down stairs or steps, wheelchairs and other push vehicles need to lift the front wheels and touch the ground while keeping the rear wheels in front of the step. When lifting the front wheels in a passenger car state with a person or animal on board, the front (or rear) part of the wheelchair must be lifted, including the weight of the person or animal, which places a heavy load on the assistant pushing the wheelchair. In addition, when the wheelchair touches down, the ground reaction force, including the weight of the person or animal, causes large shocks and vibrations.

[0003] As a device for absorbing such impact, a wheelchair with a sled (6) has been disclosed (see Patent Document 1), in which the sled (6) is attached to the axle (4a) of the wheel (4). The sled is rotatably attached to the axle through a hole in the sled body. This sled has a fan-shaped sled body (6a) with a sled section (6b) attached to the lower end. Both ends of the sled section (6b) are curved, and a long hole is provided in the center for the wheel (4) to protrude downward. The sled is made of synthetic resin with a low friction coefficient to ensure good sliding of the sled section.

[0004] Another example is a stair climbing assist device with a vertical support section, in which a support section 2 that moves up and down along a guide rail 1 is raised and lowered by operating a horizontal bar 4. Also disclosed is a device in which the contact section 5 can be folded inward to prevent it from rubbing against the ground (see Patent Document 2).

[0005] This is said to be done so that the angle of inclination of the arc at the contact point can be changed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5721039 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-037419 Summary of the Invention [Problem to be solved by the invention]

[0007] However, when the above-mentioned sled-equipped wheelchair is used to go up and down stairs or move over steps, the sled rotates freely and tilts, so when the wheelchair shifts from having the front wheels on the ground to having the rear wheels on the ground (or vice versa), the balance becomes unstable and a large impact occurs when the wheelchair touches the ground, making it difficult to move smoothly.

[0008] Furthermore, if the vehicle is made movable using a lifting device, such as the above-mentioned stair climbing assistance device with an up-and-down support part, the mechanism becomes complex, increasing the risk of an accident due to malfunction of the moving parts, while if reinforced with high strength, the vehicle weight increases, which may actually make it more difficult to operate the vehicle.

[0009] Therefore, the present invention aims to provide a shock absorber and test method that uses a simple mechanism to enable smooth movement when a wheelchair goes up and down stairs or moves over steps, even though balance becomes unstable when the front wheels touch the ground and the rear wheels touch the ground (or vice versa), causing a large impact when the wheels touch the ground. [Means for solving the problem]

[0010] In order to solve the above problems, the shock absorber for a hand-pushed passenger car according to the present invention employs the following measures (1) to (10): Note that the strings of numbers or letters following the names of the components are symbols given for the sake of convenience in understanding the configuration of each embodiment, and are not intended to limit the concept or shape of the configuration.

[0011] (1) The shock absorber for a push cart of the present invention is The vehicle is comprised of a box-shaped buffer body (1) that is formed between the front and rear running axes (W1, W2) of a push cart (a four-wheeled passenger vehicle including a wheelchair or four-wheeled bogie) and between the left and right running wheels (W1 / W2), below the seat (SC) of the cart, and that has the same width as the seat width (SCW). The buffer body (1) is fixedly supported in a hollow position above the ground contact lines (WL) of the front and rear running wheels (W1, W2). The lower surface of the buffer body (1) is formed with a buffer surface made of an elastic material, with a convex surface line (11TL) that is approximately parallel to or approximately inclined with the ground contact line (WL) at the hollow position, and the buffer surface is formed with connected convex portions (11) that are arranged in the front-rear and left-right directions within the surface.

[0012] When a push vehicle goes up or down stairs or steps, the operator must lift one of the front or rear running wheels of the vehicle (usually the two running wheels in the forward direction). However, the state before the lifted front or rear running wheels touch the ground becomes unstable. In this invention, when the operator lifts one of the front or rear running wheels, the cushioning surface of the shock absorber touches the step, dispersing and absorbing the impact when the front or rear running wheels touch the ground. Because it can be configured with a relatively small mass, it can reduce the burden when lifting the front wheel. Furthermore, by creating an intermediate contact state in which the rear wheel touches the ground surface before the front wheel touches the step, the burden on the operator can be reduced.

[0013] (2) (crown spherical convex part) The continuous convex portions (11) of the buffer surface are made of a large number of partially spherical (crown spherical) convex portions made of a hard elastic material (HS Shore hardness 50 or more), The cushioning surface is fixedly formed on the lower layer material of the laminate via an impact absorbing layer, and is characterized in that a large number of convex partial spheres (crown spheres) of the same diameter are arranged on the lower surface of this lower layer material, spaced apart at equal intervals from each other or adjacent to each other, in a honeycomb shape when viewed from the bottom, or in rows parallel to the width direction.

[0014] The honeycomb-shaped arrangement in bottom view corresponds to a shock absorber in which a number of crown-shaped convex portions are fixed to the underside as non-rotating buffer surfaces, as in the first embodiment (Fig. 3) described later. The row-shaped arrangement in bottom view corresponds to a shock absorber in which semi-cylindrical convex portions are fixed in a vertical and horizontal arrangement in bottom view as non-rotating buffer surfaces, as in the second embodiment (Fig. 5) described later.

[0015] With the above configuration, the convex portions of the buffer surface come into non-rotating contact with the step as the weight shifts from the front wheel to the rear wheel or from the rear wheel to the front wheel, and after passing through an intermediate contact state between the front wheel and the buffer surface or an intermediate contact state between the rear wheel and the buffer surface (for example, Figure 4), the rear wheel or the front wheel can be brought into contact with the step to ascend or descend the step. In the intermediate contact state, the recessed portions between the convex portions engage with the step, resulting in a stable state.

[0016] (3) (Wheels or rollers with crown-shaped convex parts) The continuous convex portion of the buffer surface is made of a plurality of hard elastic materials (HS Shore hardness 50 or more), and is composed of a circumferential convex rotating body having a circumferential convex portion with a curved cross section at the convex end, The cushioning surface is fixedly formed on the lower layer material of the laminate via an impact absorbing layer, and is characterized in that a large number of convex rotating bodies of the same diameter are supported on the lower surface of this lower layer material by axles in the width direction, arranged in a honeycomb shape when viewed from the bottom or in rows parallel to the width direction.

[0017] The above configuration corresponds to a shock absorber with axle-rotating wheels exposed on the underside, as in the following embodiments 3 (FIGS. 6-7), 4 (FIGS. 8-10), 5 (FIG. 11), and 6 (FIG. 12). As the weight shifts from the front wheels to the rear wheels, or from the rear wheels to the front wheels, the wheels touch the step, resulting in an intermediate contact state between the front wheels and the buffer surface, or an intermediate contact state between the rear wheels and the buffer surface (e.g., FIG. 4). In the intermediate contact state, the recessed portions between the convex portions engage with the step, resulting in a stable state. After reaching this intermediate contact state, by operating the wheels so as to roll, the rear or front wheels can be more easily brought into contact with the step, allowing the vehicle to ascend or descend the step.

[0018] The axle is made of spring steel, and the spring elasticity of the axle also serves to cushion the impact.

[0019] (4) (Layer structure of buffer body (1)) The buffer body (1) has a layered structure in the thickness direction with an impact absorbing layer as an intermediate layer, and is supported and fixed by one or more elastic arms (16) connected to the mounting surface on the underside or side of the seat of the traveling vehicle so as to maintain the height and angle of the hollow position within a predetermined range. The elastic arm (16) is characterized by being composed of at least one of elastic plate-like arms (163, 164) fixed in pairs at symmetrical positions on the left and right, or rod-like arms (161, 162, 163) having a uniaxial extension structure (and even a suspension structure).

[0020] The elastic plate-like arm configuration corresponds to a shock absorber in which narrow plate-like arms are combined and fixed with pin 16A, as in the later-described embodiment 3 (FIGS. 6-7) and embodiment 5 (FIGS. 9-10). The rod-like arm configuration corresponds to a shock absorber in which a telescopic arm that is axially extendable and has a built-in spring or buffer oil and is fixed vertically, as in the later-described embodiment 1 (FIGS. 1-3), embodiment 2 (FIG. 4), embodiment 4 (FIG. 8), embodiment 6 (FIG. 11), embodiment 7 (FIG. 12), embodiment 8 (FIG. 13), and embodiment 9 (FIG. 14).

[0021] (5) (Inserting cushioning material into the box-shaped frame) The buffer body (1) is formed by combining a box-shaped frame (14F) that surrounds at least one of the upper, left and right, or front and rear sides in a box-like or partial box-like shape and is supported and fixed by the elastic arms, with a laminated body of a predetermined planar shape that is fitted into or sandwiched between the box-shaped frame (14F) and supported as a frame, A feature of this structure is that while the box-shaped frame (14F) remains supported and fixed in a predetermined hollow position, a laminate of a predetermined planar shape (laminated in the order of upper layer 12, middle layer 13, and lower layer 12) can be removed from within the box-shaped frame (14F).

[0022] (6) (Inserting cushioning material into the box-shaped frame) The laminate is formed by combining and stacking an upper layer (12), a middle layer (13), and a lower layer (12) in this order in the thickness direction, and among these, the middle layer (12, 13) is an impact absorbing layer made of an elastic material having a higher compressive elastic modulus than the lower and upper layers. At least one or two layers of the upper layer, middle layer, and lower layer constitute a layer block, which is separable from the remaining layer blocks, and is characterized by being composed of a combination of a plurality of layer blocks that can be separated from each other. The laminate may be formed by combining a plurality of layers having a predetermined planar shape, any one of which has different elasticity, laminated without adhesive, or by surface-bonding. This form corresponds to the following embodiments 1 to 9.

[0023] (7) (Position adjustment state or storage state) The buffer body (1) is supported and fixed by one or more arms (elastic arms (16) or angle-adjustable arms (20)) connected to the underside of the seat of the traveling vehicle or to the mounting surfaces on the sides thereof so as to maintain a predetermined support angle (the angle of the convex line 11TL relative to the ground contact line) in the hollow position, and the one or more arms (elastic arms (16) or angle-adjustable arms (20)) are fixed to the underside of the seat of the traveling vehicle or to the mounting surfaces on both sides of the traveling vehicle via a front-rear position adjustment mechanism. The buffer body (1) has front and rear arms that are combined in a crossed state on each of the left and right sides and are rotatably pinned at pin intersections (16A). The front-rear position adjustment mechanism is used to selectively adjust the arm fixing position or pin fixing position of at least one of the front and rear arms, or to release some of the arm fixing positions or pin fixing positions, thereby changing the front-rear position or height of the buffer body (1) and placing it in a position adjusted state or a stowed state.

[0024] The "position adjusted state" here refers to a state in which the hollow position of the buffer body is adjusted forward or backward in the traveling direction of the traveling vehicle and can be changed to any position. The "stored state" refers to a state in which the buffer body is brought close to the seat of the traveling vehicle, and is used when the buffer body is folded or when there is a partial step or obstacle on the traveling surface, thereby making it possible to avoid unnecessary external contact. The form in which the buffer body is fixed at the pin intersection corresponds to the fourth, fifth, and sixth embodiments described below.

[0025] (8) (Front and rear shock absorbers) The cushioning body (1) is characterized in that a horizontally elongated columnar front and rear cushioning portion (18) made of an elastic body is attached and fixed to at least one of the front and rear portions of a predetermined thickness. Specifically, the buffer body (1) is formed by combining a box-shaped frame (14F) supported and fixed by one or more arms with a stacked body of a predetermined planar shape that is box-shaped or partially box-shaped and frame-supported by the box-shaped frame (14F) in at least one pair of directions, namely the top, left and right, or front and rear. Front and rear buffer parts (18) are fixed to protrude forward or rearward from the front and rear sides of the box-shaped frame (14F) or from the front and rear sides of the stacked body that is frame-supported by the box-shaped frame (14F).

[0026] The front and rear buffer sections (18) are made of an elastic material with a higher compressive elastic modulus than the articulated convex sections, and serve to buffer unwanted contact of the buffer body with a seated occupant or a manual pusher, or unwanted external contact while traveling. They can also serve as shock buffers that reduce the impact when the front and rear corners of the buffer body come into close contact with steps when going up or down steps.

[0027] (9) (Hand-pushed vehicle with shock absorber) The push cart with shock absorber is characterized by comprising a push cart having a cloth-like seat stretched by left and right frames, the shock absorber and an elastic arm. [Effects of the Invention]

[0028] By taking the above measures, we have been able to provide a shock absorber and test method that uses a simple mechanism to prevent the balance from becoming unstable and a large impact occurring when the front wheels touch the ground and the rear wheels touch the ground (or vice versa) when the pushcart is used to go up and down stairs or over steps, allowing smooth movement. [Brief explanation of the drawings]

[0029] [Figure 1]1A is a side view of a wheelchair equipped with a shock absorber according to a first embodiment of the present invention, and FIG. 1B is an enlarged view of the shock absorber portion. [Figure 2] 1 is a rear view of a wheelchair equipped with a shock absorber according to a first embodiment. [Figure 3] 1A is a bottom view of a wheelchair equipped with a shock absorber according to a first embodiment, and FIG. 1B is an enlarged view of the shock absorber portion. [Figure 4] 1A is a diagram showing an example of a wheelchair equipped with the shock absorber of the first embodiment in use, and FIG. 1B is a diagram showing an enlarged view of the shock absorber portion. [Figure 5] FIG. 10 is a bottom perspective view of a wheelchair equipped with a shock absorber according to a second embodiment of the present invention. [Figure 6] 10A is a side view of a wheelchair equipped with a shock absorber according to a third embodiment of the present invention, and FIG. 10B is an enlarged view of the shock absorber portion. [Figure 7] FIG. 11 is a rear view of a wheelchair equipped with a shock absorber according to a third embodiment. [Figure 8] 10(a) is a side view of a shock absorber according to a fourth embodiment of the present invention, and FIG. 10(b) is a bottom view thereof. [Figure 9] FIG. 10 is a side view of a shock absorber according to a fifth embodiment of the present invention. [Figure 10] 10A is an exploded view of the axle structure of odd-numbered rows in the shock absorber of embodiment 5, and FIG. 10B is an exploded view of the axle structure of even-numbered rows. [Figure 11] 10(a) is a front view of a shock absorber according to a sixth embodiment of the present invention, and FIG. 10(b) is an enlarged view of a wheel portion of the shock absorber. [Figure 12] 10(a) is a front view of a shock absorber according to a seventh embodiment of the present invention, and FIG. 10(b) is an enlarged view of a wheel portion of the shock absorber. [Figure 13] FIG. 13 is a side view of an impact absorber according to an eighth embodiment of the present invention. [Figure 14] FIG. 13 is a side view of a shock absorber according to a ninth embodiment of the present invention. [Figure 15] FIG. 13 is a side view of a travelling vehicle (stroller) equipped with a shock absorber according to a tenth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, shock absorbers for hand-pushed passenger cars according to embodiments will be described with reference to the drawings. However, the embodiments described below are merely examples of the present invention in all respects. Furthermore, the numerical or alphabetical strings following the names of the components are symbols added for convenience in understanding the configuration of each embodiment, and are not intended to limit the concept or shape of the configuration. Furthermore, it goes without saying that various improvements and modifications can be made based on the embodiments described below without departing from the scope of the present invention. In other words, when implementing the present invention, specific configurations according to the embodiments may be adopted as appropriate.

[0031] (Push cart) The shock absorber for a pushcart of the present invention is supported and fixed to a pushcart having front and rear running wheels (W1, W2). The pushcart to which the shock absorber of the present invention is attached is a four-wheeled passenger vehicle having four running wheels consisting of front and rear running wheels (W1, W2). This pushcart includes wheelchairs and four-wheeled carriages.

[0032] (Basic configuration) This shock absorber has, as its basic configuration, at least: a box-shaped buffer body (1) formed in a planar shape with the same width as the seat width (SCW) below the seat (SC) of a four-wheeled pushcart having front and rear traveling axles (W1, W2), between the front and rear traveling axles (W1, W2) and between the left and right traveling wheels (W1 / W2); a buffer surface made of an elastic material, on the lower surface of the buffer body (1), in which a convex line (11TL) that is approximately parallel to or approximately inclined with the ground line (WL) is formed as a hollow position; The cushioning surface is provided with continuous protrusions (11) formed on the cushioning surface and arranged in the front-rear and left-right directions within the surface.

[0033] The box-shaped buffer body (1) is fixedly supported in a hollow position above the ground contact lines (WL) of the front and rear running wheels (W1, W2) of the hand-wheeled vehicle to which it is attached. When a push vehicle goes up or down stairs or steps, the operator must lift one of the front or rear running wheels of the vehicle (usually the two running wheels in the forward direction). However, the state before the lifted front or rear running wheels touch the ground becomes unstable. In this invention, when the operator lifts one of the front or rear running wheels, the cushioning surface of the shock absorber touches the step, dispersing and absorbing the impact when the front or rear running wheels touch the ground. Because it can be configured with a relatively small mass, it can reduce the burden when lifting the front wheel. Furthermore, by creating an intermediate contact state in which the rear wheel touches the ground surface before the front wheel touches the step, the burden on the operator can be reduced.

[0034] (crown spherical convex part) The continuous convex portions (11) of the buffer surface are made of a large number of partially spherical (crown spherical) convex portions made of a hard elastic material (HS Shore hardness 50 or more), The cushioning surface is fixedly formed on the lower layer material of the laminate via an impact absorbing layer, and on the lower surface of this lower layer material, a large number of convex partial spheres (crown spheres) of the same diameter are arranged at equal intervals from each other or adjacent to each other in a honeycomb shape when viewed from the bottom, or in rows parallel to the width direction.

[0035] The honeycomb-shaped arrangement in bottom view corresponds to a shock absorber in which a number of crown-shaped convex portions are fixed to the underside as non-rotating buffer surfaces, as in the first embodiment (Fig. 3) described later. The row-shaped arrangement in bottom view corresponds to a shock absorber in which semi-cylindrical convex portions are fixed in a vertical and horizontal arrangement in bottom view as non-rotating buffer surfaces, as in the second embodiment (Fig. 5) described later.

[0036] With the above configuration, the convex portions of the buffer surface come into non-rotating contact with the step as the weight shifts from the front wheel to the rear wheel or from the rear wheel to the front wheel, and after passing through an intermediate contact state between the front wheel and the buffer surface or an intermediate contact state between the rear wheel and the buffer surface (for example, Figure 4), the rear wheel or the front wheel can be brought into contact with the step to ascend or descend the step. In the intermediate contact state, the recessed portions between the convex portions engage with the step, resulting in a stable state.

[0037] (Wheels or rollers on the crown convex part) The continuous convex portion of the buffer surface is made of a plurality of hard elastic materials (HS Shore hardness 50 or more), and is composed of a circumferential convex rotating body having a circumferential convex portion with a curved cross section at the convex end, The cushioning surface is fixedly formed on the lower layer of the laminate via an impact absorbing layer, and is characterized in that a large number of circumferentially convex rotating bodies of the same diameter are supported on the lower surface of this lower layer in a honeycomb arrangement in a bottom view or in rows parallel to the width direction by axles in the width direction. A crown-spherical convex wheel or roller means that the rolling side is not a cylindrical rolling element, but has an enlarged diameter portion that protrudes circumferentially in the width direction center, or has smoothly rounded reduced diameter portions at both width direction ends. Specific forms include spherical or elliptical rollers, as well as top-shaped rollers with one row of disc-shaped circumferential convex portions in the width direction center or two rows at both ends, and tire-shaped rollers with rounded chamfered corners.

[0038] The above configuration corresponds to a shock absorber with axle-rotating wheels exposed on the underside, as in the following embodiments 3 (FIGS. 6-7), 4 (FIGS. 8-10), 5 (FIG. 11), and 6 (FIG. 12). As the weight shifts from the front wheels to the rear wheels, or from the rear wheels to the front wheels, the wheels touch the step, resulting in an intermediate contact state between the front wheels and the buffer surface, or an intermediate contact state between the rear wheels and the buffer surface (e.g., FIG. 4). In the intermediate contact state, the recessed portions between the convex portions engage with the step, resulting in a stable state. After reaching this intermediate contact state, by operating the wheels so as to roll, the rear or front wheels can be more easily brought into contact with the step, allowing the vehicle to ascend or descend the step.

[0039] The axle is characterized in that it is equipped with spring steel or is mostly made of spring steel, and shocks can also be absorbed by the spring elasticity of the axle.

[0040] (Layer structure of buffer body (1)) The buffer body (1) has a layered structure in the thickness direction with an impact absorbing layer as an intermediate layer, and is supported and fixed by one or more elastic arms (16) connected to the mounting surface on the underside or side of the seat of the traveling vehicle so as to maintain the height and angle of the hollow position within a predetermined range. The elastic arm (16) is characterized by being composed of at least one of elastic plate-like arms (163, 164) fixed in pairs at symmetrical positions on the left and right, or rod-like arms (161, 162, 163) having a uniaxial extension structure (and even a suspension structure).

[0041] The elastic plate-like arm configuration corresponds to a shock absorber in which narrow plate-like arms are combined and fixed with pin 16A, as in the later-described embodiment 3 (FIGS. 6-7) and embodiment 5 (FIGS. 9-10). The rod-like arm configuration corresponds to a shock absorber in which a telescopic arm that is axially extendable and has a built-in spring or buffer oil and is fixed vertically, as in the later-described embodiment 1 (FIGS. 1-3), embodiment 2 (FIG. 4), embodiment 4 (FIG. 8), embodiment 6 (FIG. 11), embodiment 7 (FIG. 12), embodiment 8 (FIG. 13), and embodiment 9 (FIG. 14).

[0042] (Inserting cushioning material into the box-shaped frame) The buffer body (1) is formed by combining a box-shaped frame (14F) that surrounds at least one of the upper, left and right, or front and rear sides in a box-like or partial box-like shape and is supported and fixed by the elastic arms, with a laminated body of a predetermined planar shape that is fitted into or sandwiched between the box-shaped frame (14F) and supported as a frame, The stack (12, 13) having a predetermined planar shape can be removed from the box-shaped frame (14F) while the box-shaped frame (14F) remains supported and fixed in a predetermined hollow position.

[0043] (Inserting cushioning material into the box-shaped frame) The laminate is formed by combining and stacking an upper layer (12), a middle layer (13), and a lower layer (12) in that order in the thickness direction, and the middle layers (12, 13) are shock-absorbing layers made of an elastic material having a higher compressive elastic modulus than the upper and lower layers. At least one or two layers of the upper layer, middle layer, and lower layer constitute a layer block, which can be separated from the remaining layer blocks, and is characterized by being composed of a combination of a plurality of layer blocks that can be separated from each other.

[0044] (Position adjustment state or storage state) The buffer body (1) is supported and fixed by one or more arms (elastic arms (16) or angle-adjustable arms (20)) connected to the mounting surfaces on the underside or sides of the seat of the traveling vehicle so as to maintain the support angle (the angle of the convex line 11TL relative to the ground line) at a predetermined angle in the hollow position, and the one or more arms (elastic arms (16) or angle-adjustable arms (20)) are fixed to the mounting surfaces on the underside of the seat of the traveling vehicle or on both sides of the traveling vehicle via a position adjustment mechanism in the front-rear direction.

[0045] The buffer body (1) has front and rear arms that are combined in a crossed state on each of the left and right sides and are rotatably pinned at pin intersections (16A), and is characterized in that the buffer body (1) can be placed in a position adjusted state or a stored state with its front-to-rear position or height changed by using a front-to-rear position adjustment mechanism to selectively adjust the arm fixing position or pin fixing position of at least one of the front and rear arms, or by releasing some of the arm fixing or pin fixing.

[0046] The position adjustment state is a state in which the hollow position of the buffer body is adjusted forward or backward in the traveling direction of the traveling vehicle and can be changed to any position. The stored state is a state in which the buffer body is close to the seat of the traveling vehicle, and is used when the buffer body is folded or when there is a partial step or obstacle on the traveling surface, making it possible to avoid unnecessary external contact.

[0047] (Front and rear shock absorbers) The cushioning body (1) is characterized in that a horizontally elongated columnar front and rear cushioning portion (18) made of an elastic body is attached and fixed to at least one of the front and rear portions of a predetermined thickness.

[0048] Specifically, the buffer body (1) is formed by combining a box-shaped frame (14F) supported and fixed by one or more arms with a stacked body of a predetermined planar shape that is box-shaped or partially box-shaped and frame-supported by the box-shaped frame (14F) in at least one pair of directions, namely the top, left and right, or front and rear. Front and rear buffer parts (18) are fixed to protrude forward or rearward from the front and rear sides of the box-shaped frame (14F) or from the front and rear sides of the stacked body that is frame-supported by the box-shaped frame (14F).

[0049] The front and rear buffer sections (18) are made of an elastic material with a higher compressive elastic modulus than the articulated convex sections, and serve to buffer unwanted contact of the buffer body with a seated occupant or a manual pusher, or unwanted external contact while traveling. They can also serve as shock buffers that reduce the impact when the front and rear corners of the buffer body come into close contact with steps when going up or down steps.

[0050] (Hand-pushed vehicle with shock absorber) The present invention is used as a shock absorber-equipped pushcart that is pre-installed with the shock absorber for a pushcart. Here, a pushcart is used to carry a human, animal, or living object, has front and rear running wheels, and has a handle or arm for pushing, so that it can be manually pushed by an operator. Specific examples include wheelchairs, strollers, walkers, and pushcarts. This hand-operated vehicle is characterized by comprising a hand-operated vehicle having a cloth-like seat stretched between left and right frames, the shock absorber, and an elastic arm.

[0051] (Gear up lever) In addition to the above, the adjustment mechanism for the elastic arm may comprise an operating lever connected to the elastic arm and a fixing mechanism for the operating lever, and the height may be adjusted by operating the operating lever.

[0052] (Configuration of shock absorber of embodiment 1) The configuration of the shock absorber of the first embodiment will be described with reference to Figs. 1 to 4, which show examples. Fig. 1 is a side view (a) of a wheelchair, which is a push-cart equipped with the shock absorber of the first embodiment of the present invention, and an enlarged view (b) of the shock absorber portion. Fig. 2 is a rear view of the wheelchair equipped with the shock absorber of the first embodiment. As shown in Fig. 2, the shock absorber of the first embodiment is fixed by a fixing plate 17 that spans between the left and right side frames SA of the push-cart. Fig. 3 is a bottom view (a) of the wheelchair equipped with the shock absorber of the first embodiment, and an enlarged view (b) of the shock absorber portion.

[0053] The pushcart of the first embodiment is configured with a handle HG, a back seat SB, a seat SC, side frames SA, footrests FS, and front and rear running wheels W1 and W2. The front and rear ground contact lines WL, formed by connecting the lowest points of the front and rear running wheels W1 and W2 in a side view, are the lines of the running surface when the vehicle is running on a flat, horizontal running surface. As shown in FIG. 1(b), the shock absorber of the first embodiment is configured with a fixed plate 17 with a sliding mechanism on its underside, a single elastic arm 16 that extends and is fixed at its upper end to the lower part of the fixed plate 17 via the sliding mechanism, and a box-shaped buffer body 1 fixed to the lower end of the elastic arm 16. The buffer body 1 is configured by combining a box-shaped frame (14F) that encloses the upper and front and rear sides like a lid, and a laminated body that is partially box-shaped and frame-supported in the front and rear directions by the box-shaped frame (14F). Front and rear buffer parts (18) are fixed to protrude forward or rearward from the front and rear sides of the box-shaped frame (14F) or from the front and rear sides of the stack sandwiched and supported by the box-shaped frame (14F).

[0054] 1 and 2, the elastic arm 16 of the first embodiment is composed of a cylindrical main body 163 containing an elastic material, an extension cylindrical body 162 connected to the lower end of the cylindrical main body 163 via a tightening ring 16N, and a rod-like body 161 inserted in a nested manner into the lower end of the extension cylindrical body 162. The rod-like body 161 has its upper end abutting against an elastic material contained within the extension cylindrical body or the cylindrical main body, and is elastically biased by the contained elastic material when subjected to an external force in the compressive direction.

[0055] The shock absorber of the first embodiment has a number of hemispherical connected protrusions 11 arranged in a honeycomb pattern on its underside, as shown in Fig. 3. The hemispherical bodies 11T are connected together without any gaps in the width direction to form a single connected protrusion row, and a number of hemispherical bodies 11T are formed adjacent to the first connected protrusion row, offset in the width direction by a radius from the center position of the hemispherical bodies 11T of the first connected protrusion row, to form an adjacent connected protrusion row. Further, a number of hemispherical bodies 11T are formed adjacent to the adjacent connected protrusion row, offset in the width direction by a radius from the center position of the hemispherical bodies 11T of the connected protrusion row. In this way, a group of multiple connected protrusions is formed, including a first connected protrusion row 111, a second connected protrusion row 112 offset in the width direction from the first row by a radius, a third connected protrusion row 113 offset in the width direction from the second row by a radius, a fourth connected protrusion row 114 offset in the width direction from the third row by a radius, etc. These hemispherical bodies 11T have a so-called honeycomb-like arrangement configuration when viewed from the bottom, with their centers arranged on symmetrical oblique imaginary arrangement lines TX1 and TX2 (FIG. 3(b)). This honeycomb-like arrangement when viewed from the bottom is made of an integrally molded elastic material with a number of crown-shaped spherical protrusions fixed to the underside as non-rotating buffer surfaces.

[0056] 4A shows an example of a wheelchair equipped with the shock absorber of embodiment 1 in use, and FIG. 4B shows an enlarged view of the shock absorber portion. At the corner of the step, gaps 11TG between hemispherical protrusions 11A of a particular honeycomb-arranged connected protrusion row and the adjacent hemispherical protrusions 11A of the connected protrusion row next to the next row (the third row in FIG. AA) are arranged so as to be sandwiched between the upper and lower parts of the corner, creating a stable shock-absorbing state. At the same time, hemispherical bodies 11T of the connected protrusion row between the two connected protrusion rows interfere with each other at regular intervals in a scattered manner across the width of the step, allowing the wheelchair to slide to the position of the next gap 11TG without getting caught on the step in this shock-absorbing state (FIG. 4).

[0057] (Configuration of shock absorber of embodiment 2) The configuration of the shock absorber of the second embodiment will be described with reference to Fig. 5, which shows an example. Fig. 5 is a bottom perspective view of a wheelchair equipped with the shock absorber of the second embodiment of the present invention. The continuous convex portions of the buffer surface of the second embodiment are made of a plurality of hard elastic materials (for example, HS Shore hardness 50 to 300), and are cylindrical circumferential convex rotors 11R of a predetermined axis having a circumferential convex portion with a curved cross section at the convex end. The cushioning surface is fixedly formed on the lower layer material of the laminate via an impact absorbing layer, and a number of circumferential convex rotating bodies 11R of the same diameter are supported in rows on the lower surface of this lower layer material with gaps 11RD in the width direction, and the rows of the circumferential convex rotating bodies 11R supported in each row are supported by width-directional axles so that the positions of the gaps 11RD are shifted in the width direction and form a honeycomb-shaped arrangement when viewed from the bottom.

[0058] The buffer 1 is formed by combining a box-shaped frame (14F) that encloses the top and front and rear like a lid, and a stack that is partially box-shaped and frame-supported in the front and rear directions by the box-shaped frame (14F). Front and rear buffer parts (18) are fixed to protrude forward or rearward from the front and rear sides of the box-shaped frame (14F) or from the front and rear sides of the stack that is sandwiched and frame-supported by the box-shaped frame (14F).

[0059] (Configuration of shock absorber of embodiment 3) The configuration of the shock absorber of the third embodiment will be described with reference to Figures 6 and 7, which show examples. Figure 6 is a side view (a) of a wheelchair equipped with the shock absorber of the third embodiment of the present invention, and an enlarged view (b) of the shock absorber portion. Figure 7 is a rear view of the wheelchair equipped with the shock absorber of the third embodiment. The shock absorber (1) of the third embodiment has a layered structure in the thickness direction with a shock absorbing layer as an intermediate layer, and is supported and fixed by one or more elastic arms (16) connected to the mounting surface on the underside or side of the seat of the traveling vehicle so as to maintain the height and angle of the hollow position within a predetermined range. The elastic arm (16) is composed of at least one of elastic plate-like arms (163, 164) fixed in pairs at symmetrical positions on the left and right, or rod-like arms (161, 162, 163) having a uniaxially expandable structure (or a suspension structure). The elastic plate-like arms are configured by combining narrow plate-like arms and fixing their lower ends with pins 16A.

[0060] (Configuration of shock absorber of embodiment 4) The configuration of the shock absorber of embodiment 4 will be described with reference to Fig. 8, which shows an example. Fig. 8 is a side view (a) of the shock absorber of embodiment 4 of the present invention, and a bottom view (b) of the same. The elastic plate-like arm of embodiment 4 is configured as a telescopic arm that is axially extendable and has a built-in spring or buffer oil, and the shock absorber is fixed vertically.

[0061] (Configuration of shock absorber of embodiment 5) The configuration of the shock absorber of embodiment 5 will be described with reference to Figures 9 and 10, which are shown as examples. Figure 9 is a side view of the shock absorber of embodiment 5 of the present invention. Figure 10 is an exploded view of the axle structure of odd-numbered rows in the shock absorber of embodiment 5 (a) and an exploded view of the axle structure of even-numbered rows (b).

[0062] (Configuration of shock absorber of embodiment 6) The configuration of the shock absorber of Embodiment 6 will be described with reference to Fig. 11, which shows an example. Fig. 11 is a side view (a) of the shock absorber of Embodiment 6 of the present invention, and an enlarged view (b) of the wheel portion of the shock absorber. Fig. 11 is a front view (a) of the shock absorber of Embodiment 6 of the present invention as seen from the front, and an enlarged view (b) of the wheel portion of the shock absorber. The shock absorber of Embodiment 6 is configured to include a slide base 17, which is a sliding mechanism in the front-rear direction, fixed to the underside of the seat SC, a slide rail 17L that enables sliding in the front-rear direction at the center of the underside of the slide base 17, a single telescopic elastic arm 16 whose upper end is supported by the slide rail 17L and extends downward, and a box-shaped shock absorber fixed to the lower end of the elastic arm 16.

[0063] The elastic arm 16 of the sixth embodiment is a telescopic straight rod-like arm formed by inserting an extension rod 161 into the lower end of an outer tube 162 of a cylindrical body having an elastic spring built in therein, and the built-in elastic spring generates an elastic reaction force against an external compressive force. The box-shaped cushioning body of the sixth embodiment is formed by combining a stacked body supported from the top to the left and right side surfaces by this upper frame part formed by left and right box-shaped frames (14F) that surround the box-shaped body from its left and right side surfaces to its top surface in a frame shape, and a cushioning body having a connected convex part (11) made of a peripheral convex rotary body whose convex end has a curved cross section, fitted into the lower part of the stacked body. The laminate is composed of three layers: an upper layer 12 made of an elastic material with a relatively small compressive elastic modulus; an intermediate layer 13 made of an elastic material with a relatively larger compressive elastic modulus than the upper layer 12; and an upper layer 12 made of an elastic material with a smaller compressive elastic modulus than the intermediate layer 13, which are bonded together.

[0064] A buffer body with a connected protrusion (11) consisting of a circumferentially convex rotating body with a circumferentially convex portion 11E at its convex end and a curved cross section is fitted beneath the stack. This buffer body is composed of multiple circumferentially convex rotating bodies of the same diameter supported by a horizontal elastic shaft rod in the width direction via washers 11W with cushioning material. The circumferentially convex rotating bodies have a single row of disc-shaped circumferentially convex portions 11D and a single row of top-shaped rotating bodies with a horizontal shaft hole inside. The multiple circumferentially convex rotating bodies are connected to the washers 11 alternately on the left and right to form a rotatable connected protrusion. Washer 11W is a cylindrical body with truncated cone-shaped cushioning material fixed to both ends. This cushioning material contacts the left and right protrusions of the circumferentially convex rotating body, cushioning it from excessive tilt. Multiple elastic shaft rods (not shown) are equally spaced at the front and rear of the box-shaped body and rotatably arranged, with their ends abutting the inner surfaces of the left and right box-shaped frames 14F. A single shaft rod is supported by a number of rotating bodies and washers alternately in the width direction to form a rotatable row of articulated protrusions, which are then rotatably supported by axles in the width direction in a parallel row arrangement by multiple shaft rods arranged in the front-rear direction.

[0065] (Configuration of shock absorber of embodiment 7) The configuration of the shock absorber of the seventh embodiment will be described with reference to FIG. 12, which shows an example. FIG. 12 shows (a) a front view of the shock absorber of the seventh embodiment of the present invention as seen from the front, and (b) an enlarged view of the wheel portion of the shock absorber. The shock absorber of the seventh embodiment is configured to include a slide base 17, which is a sliding mechanism in the front-rear direction and is fixed to the underside of the seat SC; a slide rail 17L that enables sliding in the front-rear direction at the center of the underside of the slide base 17; one telescopic elastic arm 16 that is supported at its upper end by the slide rail 17L and extends downward; and a box-shaped shock absorber fixed to the lower end of the elastic arm 16. The elastic arm 16 of the seventh embodiment is a telescopic linear rod-like arm formed by inserting an extension rod 161 into the lower end of an outer tube 162 of a cylindrical body that has an elastic spring built in therein, and the built-in elastic spring generates an elastic reaction force against an external compressive force. The box-shaped cushioning body of embodiment 7 is formed by combining a laminate whose upper frame is formed by left and right box-shaped frames (14F) that surround the box-shaped body from its left and right side surfaces to its top surface, and a rigid cover plate 15 that is covered on the left and right sides by the box-shaped frames (14F) and covers the top surface of the box-shaped body, and a cushioning body having connected convex portions (11) made of peripheral convex revolution bodies whose convex ends have curved cross sections and are fitted into the lower part of the laminate. The laminate is made of three layers: an upper layer 12 made of an elastic material with a relatively low compressive elastic modulus, an intermediate layer 13 made of an elastic material with a relatively higher compressive elastic modulus than the upper layer 12, and the upper layer 12 made of an elastic material with a lower compressive elastic modulus than the intermediate layer 13, and the layers are bonded to each other.

[0066] A buffer body with a connected protrusion (11) consisting of a circumferentially convex rotating body with a curved cross-section and a circumferentially convex portion 11E at the convex end is fitted to the bottom of this stack. This buffer body is composed of multiple circumferentially convex rotating bodies of the same diameter supported by a horizontal elastic shaft rod in the width direction via washers 11W with cushioning material. The circumferentially convex rotating bodies have two rows of disk-shaped circumferentially convex portions 11E and are composed of two rows of top-shaped rotating bodies with horizontal shaft holes inside. The multiple circumferentially convex rotating bodies are connected to the washers 11 alternately on the left and right to form a rotatable connected protrusion. The washers 11W are cylindrical bodies with annular plate-shaped cushioning material fixed to both ends. These cushioning materials contact the left and right protrusions of the circumferentially convex rotating bodies to prevent excessive tilt. Multiple elastic shaft rods (not shown) are equally spaced in the front and rear of the box-shaped body and are rotatable, with their ends abutting the inner surfaces of the left and right box-shaped frames 14F. A single shaft rod is supported by a number of rotating bodies and washers alternately in the width direction to form a rotatable row of articulated protrusions, which are then rotatably supported by axles in the width direction in a parallel row arrangement by multiple shaft rods arranged in the front-rear direction.

[0067] (Configuration of shock absorber of embodiment 8) The configuration of the shock absorber of embodiment 8 will be described with reference to FIG. 13, which shows an example. FIG. 13 is a side view of the shock absorber of embodiment 8 of the present invention. The shock absorber of embodiment 8 includes a slide rail 17L, which is a sliding mechanism in the front-rear direction and is fixed to the underside of the seat SC; a slider 17 slidably supported on the slide rail 17; an elastic arm 16C with an external spring, the upper end of which is fixed to the center of the lower part of the slider and extends downward; a transparent cover 160 that covers the external spring of the elastic arm 16C; and a box-shaped buffer body fixed to the lower end of the elastic arm 16C. The slide rail 17L of embodiment 8 supports a slider 17LS within the rail so that it can slide in the rail direction. The slider 17LS has a stopper to fix its sliding position. The elastic arm 16C with an external spring is a telescopic, straight-rod-like arm formed by screwing an extension rod into the lower end of a cylindrical body, and its length can be adjusted by screwing the lower extension rod.

[0068] The box-shaped shock absorber is composed of front and rear box-shaped frames (14F) that surround the front and rear sides of the box-shaped body from the top to the top, and a rigid cover plate 15 that is covered at the front and rear ends by the box-shaped frame (14F) and covers the top of the box-shaped body, forming an upper frame portion, and a laminate that is supported from the top to the front and rear by this upper frame portion, and a buffer plate made of an elastic material that is fitted into the bottom of the laminate and is integrally molded with connecting protrusions (11) formed on its underside. The laminate is composed of three layers: an upper layer 12 made of an elastic material with a relatively small compressive elastic modulus, an intermediate layer 13 made of an elastic material with a relatively higher compressive elastic modulus than the upper layer 12, and the upper layer 12 made of an elastic material with a lower compressive elastic modulus than the intermediate layer 13, and these layers are bonded together.

[0069] A buffer plate having connected protrusions (11) is fitted into the lower part of this laminate. This buffer plate is made of an elastic material with a compressive elastic modulus smaller than that of either the upper layer 12 or the lower layer, and is supported by the front and rear lower pieces of the box-shaped frame (14F) at its front and rear edge portions. The buffer plate has a number of hemispherical connected protrusions (11) that protrude in a honeycomb pattern when viewed from the bottom, on the lower surface of the plate-like body except for the front and rear edge portions. When the buffer plate is supported by the box-shaped frame, these many connected protrusions 11 protrude downward from the box-shaped frame 14F.

[0070] (Configuration of shock absorber of embodiment 9) The configuration of a shock absorber according to a ninth embodiment will be described with reference to FIG. 14, which shows an example. FIG. 14 is a side view of the shock absorber according to the ninth embodiment of the present invention. The shock absorber according to the ninth embodiment includes a fixed plate having a slide rail 17L, which is a slide mechanism, on its underside; two elastic arms 16A and 16B, the upper ends of which are fixed to the lower part of the fixed plate via the slide rail 17 and extend downward, at symmetrical positions; and box-shaped buffer bodies fixed to the lower ends of the elastic arms 16A and 16B. The slide rail 17L of the ninth embodiment supports a slider 17LS within the rail so that it can slide in the rail direction. The slider 17LS is fixed in its sliding position by a stopper. The two elastic arms 16A and 16B are each a telescopic, straight-rod-shaped arm formed by inserting an extension rod into the lower end of a cylindrical body so that it can expand and contract. An elastic material is built in the interior to generate an elastic reaction force against an external force in the compressive direction.

[0071] The box-shaped shock absorber is composed of front and rear box-shaped frames (14F) that surround the front and rear sides of the box-shaped body from the top to the top, and a rigid cover plate 15 that is covered at the front and rear ends by the box-shaped frame (14F) and covers the top of the box-shaped body, forming an upper frame portion, and a laminate that is supported from the top to the front and rear by this upper frame portion, and a buffer plate made of an elastic material that is fitted into the bottom of the laminate and is integrally molded with connecting protrusions (11) formed on its underside. The laminate is composed of three layers: an upper layer 12 made of an elastic material with a relatively small compressive elastic modulus, an intermediate layer 13 made of an elastic material with a relatively higher compressive elastic modulus than the upper layer 12, and the upper layer 12 made of an elastic material with a lower compressive elastic modulus than the intermediate layer 13, and these layers are bonded together.

[0072] A buffer plate having connected protrusions (11) is fitted into the lower part of this laminate. This buffer plate is made of an elastic material with a compressive elastic modulus smaller than that of either the upper layer 12 or the lower layer, and is supported by the front and rear lower pieces of the box-shaped frame (14F) at its front and rear edge portions. The buffer plate has a number of hemispherical connected protrusions (11) that protrude in a honeycomb pattern when viewed from the bottom, on the lower surface of the plate-like body except for the front and rear edge portions. When the buffer plate is supported by the box-shaped frame, these many connected protrusions 11 protrude downward from the box-shaped frame 14F.

[0073] (Configuration of shock absorber of embodiment 10) The configuration of the shock absorber of embodiment 10 will be described with reference to Fig. 15, which shows an example. Fig. 15 is a side view of a traveling vehicle (stroller) equipped with the shock absorber of embodiment 10 of the present invention. The shock absorber of embodiment 10 has arms provided at each of the four corners of a box-shaped shock absorber (1), and each arm is fixed to the stroller by engaging or fastening to the corresponding frame on the left, right, front, and rear of the stroller. [Explanation of symbols]

[0074] HG hand push part SB Backrest W1, W2 traveling axis SC seat SCW seat width WL Ground Line 11TL Convex Line 11 Connecting protrusion TX1, TX2 honeycomb line 11B Circumferentially convex rotating body 11A axle 12 Upper layer Lower layer Laminated body Layer block 13 Middle class 15 Upper Plate 16 Elastic Arm 163,164 Elastic plate-shaped arm 16C suspension structure 16N length adjustment structure 161,162,163 Rod-shaped arm 14F Box-shaped frame 20 Angle adjustment arm 16A pin intersection 18 Front and rear shock absorbers

Claims

1. A push cart having left and right running wheels fixed to front and rear axles and a seat of a predetermined seat width, The vehicle comprises a shock absorber made of a box-shaped laminated body fixed and supported in a hollow position above the ground contact lines of the front and rear running wheels between the front and rear axles and between the left and right running wheels, An impact absorber for a pushcart, characterized in that a buffer surface is formed on the underside of the laminate, with a convex line in a hollow position that is approximately parallel to or approximately inclined from the ground contact line, and this buffer surface is formed with connected convex portions made of elastic material that are arranged in the front-to-back and left-to-right directions within the plane of the buffer surface.

2. the connected convex portions of the buffer surface are made of a plurality of partially spherical crown convex portions made of a hard elastic material, 2. The shock absorber for a push cart as described in claim 1, wherein the cushioning surface is fixed to a lower layer material of the laminate via an impact absorbing layer, and a large number of crown-shaped spherical convex portions of the same diameter are fixed adjacently or spaced apart on the lower surface of this lower layer material in a honeycomb shape when viewed from the bottom or in a row arrangement parallel to the width direction.

3. The continuous convex portions of the buffer surface are made of a plurality of hard elastic materials and have a three-dimensional shape of a rotating body having a peripheral convex portion with a curved cross section at the convex end, 2. The shock absorber for a push cart as described in claim 1, characterized in that the cushioning surface is fixedly formed on the lower layer material of the laminate via an impact absorbing layer, and a number of connected protrusions of the same diameter are arranged on the lower surface of this lower layer material in a honeycomb shape when viewed from the bottom or in rows parallel to the width direction, and are supported by a wheel axle in the width direction.

4. The buffer body is made of a laminated body with an impact absorbing layer as an intermediate layer, and is supported and fixed at a predetermined height and angle with respect to the ground contact lines of the front and rear running wheels by elastic arms connected to the lower part of the seat surface, 2. The shock absorber for a push cart according to claim 1, wherein the elastic arms are composed of at least one of elastic plate-shaped arms fixed at symmetrical positions on the left and right, or rod-shaped arms having a uniaxial suspension structure.

5. the buffer body is formed by combining a box-shaped frame that surrounds at least one of the upper part, left and right sides, or front and rear sides in a box-like or partial box-like shape and is supported and fixed by the elastic arms, and a laminate body of a predetermined planar shape that is supported in a fitted or sandwiched state by the box-shaped frame, 5. The shock absorber for a push cart according to claim 4, further comprising a removal mechanism for removing the stack from the box-shaped frame while the box-shaped frame remains supported and fixed by the elastic arms.

6. The elastic arm is a combination of multiple elastic plate-shaped arms fixed to the lower part of the seat of the vehicle body via an adjustment mechanism for the upper fixed position in the fore-and-aft direction, and is pin-fixed at a selected position as a pin intersection, and the fore-and-aft position or height of the box-shaped frame can be changed by selecting and adjusting the upper fixed position or pin-fixed position in the fore-and-aft direction.

7. 7. The shock absorber for a push cart according to claim 6, wherein the adjustment mechanism for the elastic arm comprises an operating lever connected to the elastic arm and a fixing mechanism for the operating lever, and the height can be adjusted by operating the operating lever.

8. 2. The shock absorber for a push cart as described in claim 1, wherein the shock absorber is a box-shaped laminated body having a predetermined planar shape and a predetermined thickness, and an attached shock absorber part having a horizontal column shape made of an elastic material is attached and fixed to at least one predetermined thickness portion of the front or rear of the laminated body.

9. A shock absorber for a push cart according to claim 1; a pushcart having left and right running wheels fixed to front and rear axles, front and rear, left and right frames, and a seat having a predetermined seat width stretched and formed by the left and right frames; A hand-operated vehicle with shock absorbers includes a plurality of elastic arms fixed to corresponding frames on the front, rear, left, and right sides, respectively, and supporting and fixing a box-shaped shock absorber, A box-plate-shaped buffer body is provided with a plurality of elastic arms, and each elastic arm is fixed to a corresponding frame on the left, right, front and rear of the hand-walked vehicle, so that the buffer body is supported and fixed at a predetermined height by the left and right frames.

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