Folding cart for vehicles

Abstract

To make it hard to add the weight of a carriage to a worker, when the worker moves the carriage forward / backward to load it on a loading platform or unload it from the loading platform.SOLUTION: An on-vehicle folding carriage that can be used as a carriage and can be loaded on a loading platform 2 of a vehicle or unloaded from the loading platform 2 by moving forward or backward by a worker, includes a carriage body portion 20 on which a cargo can be placed, a front wheel 30f provided at a front part of the carriage body portion 20, a front auxiliary wheel 60, a rear wheel 40b provided at a rear part of the carriage body portion 20, and a rear auxiliary wheel 67. When loading the carriage body portion 20 on the loading platform 2 of the vehicle or unloading the loading platform 2 from the loading platform, the weight of the carriage body portion 20 can be on the front and rear sides, by at least either one of the front wheel 30f and the front auxiliary wheel 60 and either one of the rear wheel 40b and the rear auxiliary wheel 67.SELECTED DRAWING: Figure 23

Description

[Technical Field]

[0001] The present invention relates to a folding cart for vehicle use that can be used as a cart and that can be loaded onto or unloaded from the bed of a vehicle by an operator moving it forward or backward. [Background technology]

[0002] A conventional vehicle-mounted folding dolly is described in Patent Document 1. As shown in FIG. 26, the vehicle-mounted folding dolly 100 described in Patent Document 1 includes a dolly main body 102 configured with a frame. An upright handle 102h is provided at the rear of the dolly main body 102, and the front side of the handle 102h forms a horizontal luggage platform 102d. In addition, a front auxiliary wheel 102f is provided at the underside of the front of the dolly main body 102. The vehicle-mounted folding dolly 100 includes a front link mechanism 104 that connects the front wheels 103 to the front of the dolly main body 102, and a rear link mechanism 106 that connects the rear wheels 105 to the rear of the dolly main body 102.

[0003] When loading the dolly main body 102 of the vehicle-mounted folding dolly 100 onto the loading platform 110 of the vehicle, an operator pushes the handle 102h of the dolly main body 102 to move the dolly main body 102 forward toward the loading platform 110. As a result, as shown in FIG. 27 , the front auxiliary wheels 102f of the dolly main body 102 rest on the loading platform 110 of the vehicle, and the front weight of the dolly main body 102 is supported by the front auxiliary wheels 102f. In this state, when the operator further moves the dolly main body 102 forward, the rear end of the loading platform 110 of the vehicle relatively presses the front link mechanism 104 and the rear link mechanism 106 of the dolly main body 102 rearward. As a result, the front link mechanism 104 and the rear link mechanism 106 of the dolly main body 102 are folded while rotating rearward, and the dolly main body 102 is loaded onto the loading platform 110 of the vehicle. When the vehicle body 102 of the vehicle-mounted folding cart 100 is to be removed from the loading platform 110 of the vehicle, the above-described procedure is carried out in reverse. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-299494 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-described vehicle-mounted folding dolly 100, the folding of the front link mechanism 104 and the rear link mechanism 106 of the dolly main body 102 begins with the front auxiliary wheels 102f of the dolly main body 102 placed on the vehicle bed 110. Therefore, during the process of loading the dolly main body 102 onto the vehicle bed 110, the weight of the dolly main body 102 is borne by the front auxiliary wheels 102f and the worker holding the handle 102h. Therefore, if the weight of the luggage on the luggage bed 102d of the dolly main body 102 is heavy, the burden on the worker increases.

[0006] The present invention has been made to solve the above problems, and the problem that the present invention aims to solve is to make it less likely that the weight of the cart will be placed on the worker when the worker moves the cart forward or backward to load it onto or unload it from the loading platform of a vehicle. [Means for solving the problem]

[0007] The above-mentioned problems are solved by the following inventions. The first invention is a foldable cart for vehicle use that can be used as a cart and that can be loaded onto or unloaded from the bed of a vehicle by an operator moving the cart forward or backward, the cart having a cart main body on which cargo can be placed, front wheels and front auxiliary wheels provided at the front of the cart main body, rear wheels and rear auxiliary wheels provided at the rear of the cart main body, and when the cart main body is loaded onto or unloaded from the bed of the vehicle, the weight of the cart main body is supported at the front and rear by at least one of the front wheels and front auxiliary wheels and one of the rear wheels and rear auxiliary wheels.

[0008] According to the present invention, when the dolly main body is mounted on or removed from the bed of a vehicle, the weight of the dolly main body is supported at the front and rear by at least one of the front wheels and front auxiliary wheels and one of the rear wheels and rear auxiliary wheels. Therefore, when an operator moves the dolly main body forward or backward to mount or remove it from the bed of a vehicle, the weight of the dolly main body is not applied to the operator. In other words, the operator can mount or remove the dolly main body from the bed of a vehicle by applying the force required to move the dolly main body forward or backward.

[0009] No. 1 According to the invention, the front and rear wheels are configured to support the weight of the bogie main body on the road surface, and the front auxiliary wheels and rear auxiliary wheels are configured to support the weight of the bogie main body on the vehicle bed. Therefore, during the process of loading the bogie main body onto the vehicle bed or unloading it from the bed, the weight of the bogie main body is supported by the front auxiliary wheels and rear wheels. After the bogie main body is loaded onto the vehicle bed, the weight of the bogie main body is supported by the front auxiliary wheels and rear auxiliary wheels. After the bogie main body is unloaded from the vehicle bed, the weight of the bogie main body is supported by the front and rear wheels.

[0010] No. 1 According to the invention, the front wheels are connected to the bogie main body by a front link mechanism, and the rear wheels are connected to the bogie main body by a rear link mechanism, and the front link mechanism and the rear link mechanism are movable between an unfolded position that supports the bogie main body and a folded-up stored position, and when the front link mechanism and the rear link mechanism are folded, the front auxiliary wheels and rear auxiliary wheels support the weight of the bogie main body on the loading platform of the vehicle. According to the first aspect of the present invention, the rear link mechanism in the unfolded position rotates forward and folds down to fit under the vehicle bed after the bogie body is mounted on the vehicle bed, so that the folded rear link mechanism does not protrude rearward from the vehicle and does not get in the way.

[0011] No. 2According to the invention, when the bogie body moves forward and is loaded onto the vehicle bed, the front link mechanism in the unfolded position is pushed relatively by the vehicle bed and rotates rearward to be folded. In other words, the front link mechanism is folded so as to fit under the bogie body, so the folded front link mechanism does not get in the way.

[0013] No. 3 According to the invention, the carriage body is configured so that it can be loaded onto or unloaded from the loading platform of a vehicle with a load placed thereon. [Effects of the Invention]

[0014] According to the present invention, when a worker moves the dolly forward or backward to load or unload it onto or from the loading platform of a vehicle, the weight of the dolly is less likely to be placed on the worker, thereby reducing the burden on the worker. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is an overall perspective view showing a vehicle-mounted folding cart according to a first embodiment of the present invention and a loading platform of a vehicle on which the cart is mounted. [Figure 2] FIG. 2 is a plan view of a loading platform of a vehicle on which the in-vehicle folding cart is mounted. [Figure 3] FIG. 2 is an overall perspective view of the vehicle-mounted folding cart as seen from the rear. [Figure 4] FIG. 2 is an overall plan view of the vehicle-mounted folding cart. [Figure 5] FIG. 2 is a side view of the vehicle-mounted folding cart. [Figure 6] 6 is a side view (enlarged view taken along arrow VI in FIG. 5) showing a front link mechanism, a link lock mechanism, and the like of the vehicle-mounted folding cart. [Figure 7] FIG. 4 is a perspective view of the link lock mechanism and the lock detection mechanism as viewed obliquely from below. [Figure 8] FIG. 4 is a side view showing a rear link mechanism of the vehicle-mounted folding cart in an unfolded state. [Figure 9]10A to 10C are side views illustrating the process of unfolding the rear link mechanism of the vehicle-mounted folding cart. [Figure 10] FIG. 4 is a side view illustrating a rear link mechanism of the vehicle-mounted folding cart in a folded state. [Figure 11] 10 is a diagram showing the overall configuration of the coupling lock release mechanism of the vehicle-mounted folding cart (locked state). FIG. [Figure 12] 10 is a plan view of a handle pull-out detection mechanism and a lower-stage side force transmission mechanism of the connection lock release mechanism. FIG. [Figure 13] FIG. 10 is a side view of the handle pull-out detection mechanism of the connection lock release mechanism. [Figure 14] 14 is a longitudinal cross-sectional view (cross-sectional view taken along the line XIV-XIV in FIG. 13) of the handle pull-out detection mechanism of the connection lock release mechanism. [Figure 15] 10A and 10B are plan views illustrating the operation of a handle pull-out detection mechanism of the connection lock release mechanism. [Figure 16] 10A and 10B are side views illustrating the operation of the handle pull-out detection mechanism of the connection lock release mechanism. [Figure 17] FIG. 2 is an overall configuration diagram of the connection lock release mechanism (in an unlocked state). [Figure 18] 3 is an overall configuration diagram of a link lock mechanism and a link lock release mechanism of the vehicle-mounted folding cart. FIG. [Figure 19] 5A and 5B are diagrams illustrating the operation of the link lock mechanism and the link lock release mechanism. [Figure 20] 10 is a diagram illustrating the relationship between the fall prevention mechanism of the vehicle-mounted folding cart and the lock detection mechanism of the link lock mechanism. FIG. [Figure 21] FIG. 4 is a vertical cross-sectional view of the lock detection mechanism. [Figure 22] 10A to 10C are side views sequentially showing how the vehicle-mounted folding cart is mounted on the loading platform of a vehicle. [Figure 23] 10A to 10C are side views sequentially showing how the vehicle-mounted folding cart is mounted on the loading platform of a vehicle. [Figure 24] 10A to 10C are side views sequentially showing how the vehicle-mounted folding cart is mounted on the loading platform of a vehicle. [Figure 25] 10A to 10C are side views sequentially showing how the vehicle-mounted folding cart is mounted on the loading platform of a vehicle. [Figure 26] FIG. 1 is a side view of a conventional folding cart for vehicle use. [Figure 27] 10A and 10B are side views illustrating the loading process of a conventional folding cart for vehicle use. DETAILED DESCRIPTION OF THE INVENTION

[0016] [Embodiment 1] An in-vehicle folding dolly according to a first embodiment of the present invention will be described below with reference to Figures 1 to 25. The in-vehicle folding dolly 10 according to this embodiment is a dolly that can be used alone as a dolly and is configured to be able to be mounted with luggage placed on it in a vehicle 1 that has a platform 2 designed specifically for dollies. Here, the front, back, left, right, and top and bottom shown in the figures correspond to the front, back, left, right, and top and bottom of the vehicle 1 and the in-vehicle folding dolly 10.

[0017] <Overview of the in-vehicle folding cart 10> As shown in Figure 1, the vehicle-mounted folding cart 10 is a push cart and includes a cart main body 20 equipped with a loading platform deck frame 22 and other components. The loading platform deck frame 22 is the portion on which luggage is placed and includes a substantially rectangular edge frame (figure number omitted) and an intermediate frame (figure number omitted) spanning the left and right sides of the edge frame at a fixed interval. A push handle 23 is fixed in an upright position at the rear end of the loading platform deck frame 22. Note that the push handle 23 is omitted from Figure 3 and subsequent figures.

[0018] As shown in Figures 3 and 4, the truck body 20 includes a skeleton frame 21 that supports the bed deck frame 22 from below. The skeleton frame 21 includes a pair of left and right inverted L-shaped frames 21y and a horizontal connecting frame 21r that connects the left and right inverted L-shaped frames 21y. The inverted L-shaped frame 21y of the skeleton frame 21 includes a horizontal frame portion (not shown) that extends in the front-to-rear direction and a vertical frame portion (not shown) that extends downward from the rear end of the horizontal frame portion. The horizontal frame portion of the inverted L-shaped frame 21y supports the bed deck frame 22. Link rails 31 (described below), which also extend in the front-to-rear direction of the truck body 20, are attached to the outer surfaces of the horizontal frame portions of the inverted L-shaped frame 21y.

[0019] As shown in Figures 3 to 5, front wheels 30f are connected to the left and right front portions of the cart body 20 of the vehicle-mounted folding cart 10 by a pair of left and right front link mechanisms 30. The left and right front link mechanisms 30 are connected by a connecting bar 30r, as shown in Figure 1. Rear wheels 40b are connected to the left and right rear portions of the cart body 20 by rear link mechanisms 40.

[0020] <Regarding the front link mechanism 30> As shown in FIGS. 5 and 6 , the pair of left and right front link mechanisms 30 includes a front arm 32 connected to the front portion of the skeletal frame 21 of the bogie main body 20 in a vertically rotatable manner, and a support arm 33 connected to an intermediate position of the front arm 32 in a vertically rotatable manner. A front wheel 30f is attached to the pivotable end (lower end) of the front arm 32. A slide unit 34 is connected to the pivotable end (upper end) of the support arm 33 in a vertically rotatable manner. The slide unit 34 is configured to slide forward and backward along a link rail 31 extending in the front-rear direction. Therefore, when the front arm 32 pivots left (rearward) relative to the skeletal frame 21 of the bogie main body 20 in FIG. 6 and the slide unit 34 of the support arm 33 slides rearward along the link rail 31, the front link mechanism 30 is folded at a position below the skeletal frame 21. That is, the front link mechanism 30 is stored in a storage position below the skeletal frame 21.

[0021] Furthermore, when the front arm 32 rotates right (rotates forward) and the slide portion 34 of the support arm 33 slides forward along the link rail 31, the front link mechanism 30 is placed in an unfolded state (unfolded position) as shown in Fig. 6. Here, the front link mechanism 30 is provided with a spring material (not shown) that is biased in a direction to rotate the front arm 32 right (unfold). Furthermore, a link lock mechanism 50 (described later) that holds the front link mechanism 30 in an unfolded state is provided below the skeletal frame 21 (horizontal frame portion) of the bogie main body 20, as shown in Figs. 6 and 7.

[0022] <Regarding the rear link mechanism 40> As shown in Fig. 5, the rear link mechanism 40 includes a pair of left and right rear lower arms 43, each having a rear wheel 40b connected to its lower end, an intermediate link 44 connecting the left and right rear lower arms 43 at intermediate positions, and a V-shaped link 45 connected to the center of the intermediate link 44, as shown in Fig. 3. As shown in Fig. 5, the pair of left and right rear lower arms 43 have their upper ends C (rotation center C) connected to the vertical frame portions of the inverted L-shaped frame 21y of the bogie main body 20 so as to be able to rotate up and down. As shown in Fig. 3, the intermediate link 44 connects the left and right rear lower arms 43 via a horizontal shaft 44j, and a bracket 44b protruding radially outward is provided at the longitudinal center portion of the shaft 44j.

[0023] As shown in Figures 3 and 8, the V-shaped link 45 is bent in a V-shape so as to convex rearward, and the lower end of the V-shaped link 45 is connected to the bracket portion 44b of the intermediate link 44 in a manner allowing it to rotate up and down. The upper end of the V-shaped link 45 is connected to a handle bracket portion 47b provided in the center of the front end of the operating handle portion 47 in a manner allowing it to rotate up and down, as shown in Figure 8. The operating handle portion 47 is a handle for unfolding or folding the rear link mechanism 40, and is provided horizontally below the center of the rear end of the bed deck frame 22 so as to protrude rearward, as shown in Figures 3, 4, etc.

[0024] As shown in FIG. 4 and other figures, the operating handle unit 47 is formed in a substantially rectangular shape from a U-shaped frame and two pipes (figure numbers omitted) connecting the front ends of the U-shaped frame. A handle bracket 47b, to which the upper end of the V-shaped link 45 is connected, is formed at a midpoint of the two pipes of the operating handle unit 47 so as to protrude downward, as shown in FIGS. 4, 8, and other figures. The operating handle unit 47 is supported on both the left and right sides by handle rails 48 (see FIGS. 3 and 4) attached to the inner surface of the inverted L-shaped frame 21y (horizontal frame portion) of the bogie main body 20 in a manner that allows it to slide forward and backward. That is, when the operating handle unit 47 is pulled rearward, the operating handle unit 47 slides rearward along the handle rails 48. Conversely, when the operating handle unit 47 is pushed forward, the operating handle unit 47 slides forward along the handle rails 48.

[0025] When the operating handle portion 47 is pulled rearward, the upper end of the V-shaped link 45 is pulled rearward via the handle bracket portion 47b, as shown in FIG. 8. This causes the lower end of the V-shaped link 45 to move downward, and the bracket portion 44b of the intermediate link 44 is pushed down. As a result, the left and right rear lower arms 43 rotate rearward and downward (rotate left in FIG. 8) around the rotation center C relative to the skeletal frame 21 of the bogie main body 20, and the rear link mechanism 40 is deployed (deployed position). Furthermore, when the operating handle portion 47 is pushed forward, the upper end of the V-shaped link 45 is pulled forward via the handle bracket portion 47b, as shown in FIGS. 9 and 10. This causes the lower end of the V-shaped link 45 to move upward, and the bracket portion 44b of the intermediate link 44 is pulled up. As a result, the left and right rear lower arms 43 rotate forward and upward (rotate right in the figure) relative to the skeletal frame 21 of the bogie main body 20, and the rear link mechanism 40 is folded (see FIG. 10). With the rear link mechanism 40 folded, the rear wheels 40b are retracted under the bed 2 of the vehicle 1 and stored (storage position). As shown in FIGS. 8 to 10, a handle lock 49 is provided on the left side of the operating handle 47 to hold the operating handle 47 in a pushed-in front end position or pulled-out rear end position.

[0026] <Front training wheels 60 and rear training wheels 67> 1, 3, etc., in the vehicle-mounted folding dolly 10, when the pair of left and right front link mechanisms 30 and rear link mechanisms 40 are held in the unfolded position, the left and right front wheels 30f and the left and right rear wheels 40b bear the weight of the dolly main body 20 on the road surface. The vehicle-mounted folding dolly 10 also has left and right front auxiliary wheels 60 (see FIGS. 4 and 5) and left and right rear auxiliary wheels 67 (see FIGS. 4 and 5) that bear the weight of the dolly main body 20 on the bed 2 of the vehicle 1 when the left and right front link mechanisms 30 and rear link mechanisms 40 are folded and stored.

[0027] As shown in FIG. 5 and other figures, the front auxiliary wheels 60 are supported by front movable brackets 62, and the upper ends of the front movable brackets 62 are connected to the front ends of the skeletal frame 21 (inverted-L-shaped frame 21y) of the bogie main body 20 in a vertically rotatable state. The left and right front auxiliary wheels 60 are configured to support the weight of the bogie main body 20 near the lower side of the horizontal frame portion of the inverted-L-shaped frame 21y, and as shown in FIG. 4, are disposed inward in the vehicle width direction relative to the left and right front wheels 30f. As shown in FIG. 5 and other figures, the left and right rear auxiliary wheels 67 are fixed to the lower rear sides of the horizontal frame portion of the inverted-L-shaped frame 21y of the bogie main body 20 via rear fixing brackets 67b. The left and right rear auxiliary wheels 67 are configured to support the weight of the bogie main body 20 at a height position approximately equal to that of the left and right front auxiliary wheels 60. The left and right rear auxiliary wheels 67 are disposed inward in the vehicle width direction relative to the left and right rear wheels 40b, as shown in FIG. 4.

[0028] <About the link lock mechanism 50> As described above, the link lock mechanism 50 is a mechanism that holds the front link mechanism 30 in the deployed state, and a pair of left and right link mechanisms 50 are provided corresponding to the left and right front link mechanisms 30. As shown in FIGS. 7 and 18 , the link lock mechanism 50 includes a rectangular cylindrical guide portion 52 fixed to the skeletal frame 21 (connecting frame 21r) of the bogie main body 20, and a locking claw 53 housed in the guide portion 52. As shown in FIG. 7 , the link lock mechanism 50 also includes a locking piece 34r formed on the slide portion 34 of the support arm 33 of the front link mechanism 30. As shown in FIG. 18 , the guide portion 52 of the link lock mechanism 50 is fixed to the connecting frame 21r of the skeletal frame 21 so as to extend along the vehicle width direction. The locking claw 53 has a substantially rectangular column shape and is housed in the guide portion 52 in a state that allows it to be displaced in the vehicle width direction, and its tip portion is configured to protrude a certain distance outward in the vehicle width direction from the guide portion 52 due to spring force. The tip portion of the locking claw 53 has a rear side formed in a planar arc shape, and a front side serving as a flat stopper surface 53r.

[0029] As the front link mechanism 30 unfolds, the slide portion 34 of the support arm 33 slides forward along the link rail 31, causing the lock piece 34r of the slide portion 34 to come into contact with the planar, arc-shaped rear surface of the lock claw 53 and push the lock claw 53 inward in the vehicle width direction against the spring force. When the lock piece 34r of the slide portion 34 climbs over the lock claw 53 and reaches the front side of the lock claw 53, the spring force causes the lock claw 53 to protrude a certain distance outward in the vehicle width direction from the guide portion 52, as shown in Figure 7. This causes the stopper surface 53r of the lock claw 53 to engage with the lock piece 34r of the slide portion 34 of the support arm 33, unfolding the front link mechanism 30 and maintaining the link lock mechanism 50 in the unfolded, locked state.

[0030] <Regarding the connection lock mechanism 80> The vehicle-mounted folding dolly 10 is provided with a connection lock mechanism 80 that connects the vehicle-mounted folding dolly 10 to the bed 2 of the vehicle 1 when the vehicle-mounted folding dolly 10 is mounted on the bed 2 of the vehicle 1. As shown in Figures 3 to 5, the connection lock mechanism 80 is made up of a connection lock mechanism main body 82 fixed to the center in the height direction of the vertical frame portions of the left and right inverted L-shaped frames 21y of the dolly main body 20, and left and right strikers 81 (see Figure 2) provided at the rear end of the bed 2 of the vehicle 1. The connection lock mechanism main body 82 has the same basic structure as an automobile door lock, and when the horizontal rod-shaped striker 81 enters a recess in the connection lock mechanism main body 82 from the front, the striker 81 and a hook (not shown) of the connection lock mechanism main body 82 are engaged by spring force. As a result, the vehicle-mounted folding cart 10 mounted on the loading platform 2 of the vehicle 1 is connected to the loading platform 2.

[0031] <Overview of the connection lock release mechanism 210 and the link lock release mechanism 230> The vehicle-mounted folding dolly 10 is equipped with a connection lock release mechanism 210 (described later) that releases the connection lock state of the connection lock mechanism 80, and a link lock release mechanism 230 (described later) that releases the deployment lock state of the link lock mechanism 50 that holds the front link mechanism 30 in the deployed state. The connection lock release mechanism 210 and the link lock release mechanism 230 are equipped with force transmission mechanisms 210p and 230p (described later) that transmit the unlocking operation force to the connection lock mechanism 80 and the link lock mechanism 50, respectively. The lower-stage force transmission mechanism 210p of the connection lock release mechanism 210 and the upper-stage force transmission mechanism 230p of the link lock release mechanism 230 are housed in an unlocking operation box 200. As shown in Figures 3 and 4, etc., the unlocking operation box 200 is attached to the skeletal frame 21 of the dolly main body 20 at a position inside the operating handle 47 in the width direction.

[0032] <Outline of the fall prevention mechanism 90> The vehicle-mounted folding cart 10 is provided with a fall prevention mechanism 90 that hooks the front of the cart main body 20 onto the rear of the cart bed 2 of the vehicle 1 if the front link mechanism 30 is not fully deployed when the vehicle-mounted folding cart 10 is being lowered from the cart bed 2 of the vehicle 1. As shown in Figure 3, the fall prevention mechanism 90 includes a fall prevention hook 92 provided in the center of the front of the cart main body 20, a hook receiving part 94 (see Figures 1 and 2) provided in the center of the rear of the cart bed 2 of the vehicle 1, and a lock detection mechanism 96 (see Figures 3 and 4) that detects the locked state of the link lock mechanism 50.

[0033] <Regarding cargo bed 2 of vehicle 1> As shown in FIGS. 1 and 2, the loading platform 2 of the vehicle 1 is formed into a generally rectangular shape in plan view. On both the left and right sides of the loading platform 2, band-like block sections 2b are formed to be higher than the loading platform surface by a certain dimension and extend in the longitudinal direction of the vehicle. The block sections 2b are portions on which climbing guide sections 32g provided on the front arms 32 of the front link mechanisms 30 of the vehicle-mounted folding cart 10 are placed, and the rear ends of the block sections 2b form wedge-shaped inclined surfaces 2k. Strikers 81 of the connection lock mechanism 80 are provided on the inward side of the inclined surfaces 2k of the left and right block sections 2b in the vehicle width direction so as to extend in the left-right direction. Furthermore, inward of the left and right strikers 81 in the vehicle width direction, inclined rear training wheel guide sections 2h are provided to guide the left and right rear training wheels 67 of the vehicle-mounted folding cart 10 onto the loading platform surface of the loading platform 2. Furthermore, on the inner side of the left and right rear auxiliary wheel guide portions 2h in the vehicle width direction, there is provided a front auxiliary wheel guide portion 2f in the form of an inclined surface that guides the left and right front auxiliary wheels 60 of the vehicle-mounted folding dolly 10 onto the loading platform surface of the loading platform 2. Then, on the inner side (center side) of the right front auxiliary wheel guide portion 2f in the vehicle width direction, there is provided a hook receiving portion 94 of the above-mentioned fall prevention mechanism 90.

[0034] <Regarding the connection lock release mechanism 210> The connection lock release mechanism 210 is a mechanism that releases the connection lock state of the connection lock mechanism 80 that connects the vehicle-mounted folding cart 10 and the bed 2 of the vehicle 1 when the vehicle-mounted folding cart 10 is lowered from the bed 2 of the vehicle 1. The connection lock release mechanism 210 is configured so that when the vehicle-mounted folding cart 10 is lowered from the bed 2 of the vehicle 1, the connection lock release mechanism 210 can release the connection lock state of the connection lock mechanism 80 when the operating handle unit 47 is pulled rearward and the rear link mechanism 40 is unfolded, as shown in FIG. 8 . As shown in the overall configuration diagram of FIG. 11 , the connection lock release mechanism 210 is made up of a release lever 200r that performs the unlocking operation, a lower-stage side force transmission mechanism 210p that is provided in the lower stage of the unlocking operation box 200, and a handle pull-out detection mechanism 220. The handle pull-out detection mechanism 220 is a mechanism that detects when the operating handle unit 47 is pulled rearward with respect to the cart main body 20.

[0035] Here, the unlocking operation box 200 is provided with a switching lever 200y for switching between loading the vehicle-mounted folding cart 10 onto the bed 2 of the vehicle 1 and unloading it from the bed 2. The switching lever 200y and the release lever 200r are used in both the connection lock release mechanism 210 and the link lock release mechanism 230 (described later). The switching lever 200y is configured to be horizontally rotatable about the rotation center axis J0 between a left rotation limit position shown in FIG. 11 and a right rotation limit position shown in FIG. 18. The switching lever 200y is held in the left rotation limit position (unloading position) (see FIG. 11, etc.) when the vehicle-mounted folding cart 10 is being unloaded from the bed 2 of the vehicle 1. Furthermore, the switching lever 200y is held in the right rotation limit position (mounting position) (see FIG. 18, etc.) when the vehicle-mounted folding cart 10 is being loaded onto the bed 2 of the vehicle 1.

[0036] 11, the lower-stage force transmission mechanism 210p of the connection lock release mechanism 210 includes a lever-side link 212, an intermediate link 213, a drive link 214, and a handle position interlocking link 215. The lever-side link 212 is configured to be horizontally rotatable around the rotation center axis J1, and the free rotation end of the lever-side link 212 is connected to the right end of the release lever 200r by a rod-shaped link 211. In addition, a square-shaped protrusion 212t that can engage with the force transmission pin 201 of the intermediate link 213 is formed at an intermediate position of the lever-side link 212.

[0037] As shown in FIG. 11 , the intermediate link 213 is placed below the lever-side link 212 so as to be horizontally rotatable about the rotation center axis J1. The intermediate link 213 has a linear slit 213h formed in a protruding portion at one end (right end) of the intermediate link 213, and a protruding projection 213x (described below) formed at the tip of the other end (left end). The force transmission pin 201 described above is attached to the linear slit 213h of the intermediate link 213 so as to be movable along the slit 213h. Here, the switching lever 200y has an arc-shaped hole (illustration number omitted) formed on the opposite side of the rotation center axis J0 from the lever operating unit. The arc-shaped hole is formed so as to be centered on the rotation center axis J1 when the switching lever 200y is in the left rotation limit position (lowered position). The force transmission pin 201 of the intermediate link 213 is engaged with the arc-shaped hole of the switching lever 200y so as to be movable along the arc-shaped hole.

[0038] When the switching lever 200y is in the counterclockwise rotation limit position (lowered position), as shown in Fig. 11, the force transmission pin 201 of the intermediate link 213 is moved to the radially inner end of the slit portion 213h by the action of the switching lever 200y. As a result, the force transmission pin 201 of the intermediate link 213 and the rectangular convex portion 212t of the lever-side link 212 are engaged in the rotation direction of the lever-side link 212. As a result, as shown in Fig. 12, when the release lever 200r is pulled rearward and the lever-side link 212 rotates clockwise around the rotation central axis J1, the rectangular convex portion 212t of the lever-side link 212 presses the force transmission pin 201 of the intermediate link 213 in the clockwise rotation direction. Here, the center of the arc hole of the switching lever 200y with which the force transmission pin 201 of the intermediate link 213 is engaged coincides with the rotation central axis J1. Therefore, when the lever-side link 212 rotates clockwise around the rotation center axis J1, the intermediate link 213 is pushed by the force transmission pin 201 and becomes able to rotate clockwise around the rotation center axis J1.

[0039] However, when the switching lever 200y rotates clockwise from the counterclockwise rotation limit position (lowered position), the force transmission pin 201 of the intermediate link 213 moves radially outward along the slit portion 213h due to the action of the switching lever 200y. This disengages the square convex portion 212t of the lever-side link 212 from the force transmission pin 201 of the intermediate link 213. As a result, even if the release lever 200r is pulled rearward and the lever-side link 212 rotates clockwise about the rotation center axis J1, only the lever-side link 212 rotates clockwise independently, and the intermediate link 213 is held in its current position by the spring force.

[0040] As shown in FIG. 11, a drive link 214 is superimposed on the lower side of the intermediate link 213 in a state in which it can rotate horizontally around the rotation center axis J1. The drive link 214 is a link that transmits the unlocking operation force of the release lever 200r to the connection lock mechanism main body 82 of the connection lock mechanism 80. The drive link 214 is formed in a substantially L-shaped band plate shape, and one end side is connected to the rotation center axis J1. One end of a wire main body 217w of the unlock wire 217 is connected to the other end side (the free rotation end side) of the drive link 214. As shown in FIG. 11, one end side of the wire main body 217w of the unlock wire 217 is connected to the drive link 214 in a state in which it is hung on a pulley 217p, and the other end side is branched to the left and right via a branch portion 217z and is connected to the left and right connection lock mechanism main bodies 82.

[0041] A slit 214h extending in the longitudinal direction of the drive link 214 is formed near the free rotation end of the drive link 214. A force transmission pin 215p is attached to the slit 214h of the drive link 214 so as to be able to move along the slit 214h. Here, as shown in FIG. 11 , the protruding projection 213x on the left end of the intermediate link 213 is arranged along the slit 214h at the end of the slit 214h of the drive link 214 that is closer to the rotation center.

[0042] As shown in FIG. 11, the handle position interlocking link 215 is a generally band-shaped link, and its longitudinal center is connected to the rotation center axis J2 so that it can rotate horizontally around the rotation center axis J2. An arc-shaped hole (see FIG. 15, illustration number omitted) is formed at one end of the handle position interlocking link 215, and a force transmission pin 215p of the drive link 214 is engaged with the arc-shaped hole. As shown in FIG. 15, the arc-shaped hole is formed so that its center coincides with the rotation center axis J1 when the handle position interlocking link 215 is in the clockwise rotation limit position. Furthermore, as shown in FIG. 11 and other figures, one end of a wire main body 218w of a position detection wire 218 is connected to the other end of the handle position interlocking link 215. The other end of the position detection wire 218 is connected to a handle extension detection mechanism 220.

[0043] As described above, the handle extension detection mechanism 220 is a mechanism that detects when the operating handle 47 of the dolly main body 20 is extended rearward, and is provided between the right side of the operating handle 47 and the right handle rail 48, as shown in FIGS. 3 and 11. As shown in FIGS. 11, 13, and 14, the handle extension detection mechanism 220 is composed of a detection bracket 222 fixed to the front right part of the operating handle 47 and a detection sensor unit 224 attached to the underside of the bed deck frame 22 via a front-rear slide unit 224b (see FIGS. 13 and 14). The other end of the wire main body 218w of the position detection wire 218 is connected to the detection sensor unit 224. The tube portion at the other end of the position detection wire 218 is fixed to the underside of the bed deck frame 22 by a wire bracket 218b, as shown in FIG. 13.

[0044] 11 to 13, when the operating handle portion 47 is pushed forward, the pressing portion 222s of the detection bracket 222 and the pressure-receiving portion 224u of the detection sensor portion 224 are spaced apart in the front-to-rear direction. However, when the operating handle portion 47 is pulled rearward, as shown in FIGS. 15 to 17, the pressing portion 222s of the detection bracket 222 presses the pressure-receiving portion 224u of the detection sensor portion 224 rearward, and the detection sensor portion 224 slides rearward along the front-to-rear sliding portion 224b. As a result, the wire main portion 218w of the position detection wire 218 is pulled rearward by the detection sensor portion 224.

[0045] When the wire main body 218w is pulled, the handle position interlocking link 215 rotates clockwise about the rotation central axis J2 to the clockwise rotation limit position, as shown in Figure 15. As a result, the force transmission pin 215p of the drive link 214 moves along the slit portion 214h to the end of the slit portion 214h on the rotation center side due to the action of the handle position interlocking link 215. As a result, the force transmission pin 215p of the drive link 214 and the protruding protrusion 213x of the intermediate link 213 engage in the rotation direction.

[0046] <Operation of the connection lock release mechanism 210> When the switching lever 200y is held in the left rotation limit position (lowered position) as shown in Fig. 11, the lever-side link 212 and the intermediate link 213 of the lower-side force transmission mechanism 210p are engaged in the rotation direction via the force transmission pin 201, etc. In this state, when the operating handle unit 47 is pulled rearward, as shown in Fig. 15, the pressing portion 222s of the detection bracket 222 of the handle pull-out detection mechanism 220 presses the pressure receiving portion 224u of the detection sensor unit 224, and the detection sensor unit 224 slides rearward along the front-rear sliding portion 224b. As a result, the wire main body 218w of the position detection wire 218 is pulled, and the handle position interlocking link 215 of the lower-side force transmission mechanism 210p rotates clockwise around the rotation central axis J2.

[0047] As a result, the force transmission pin 215p of the drive link 214 moves along the slit portion 214h to the end of the slit portion 214h on the rotation center side. This causes the force transmission pin 215p of the drive link 214 to engage with the protrusion 213x of the intermediate link 213 in the rotation direction. When the operating handle portion 47 is pulled rearward, the rear link mechanism 40 is held in the deployed state as described above.

[0048] Next, as shown in Fig. 17, when the release lever 200r is pulled rearward, the lever-side link 212 rotates clockwise about the rotation central axis J1, and the rotational force of the lever-side link 212 is transmitted to the drive link 214 via the intermediate link 213, causing the drive link 214 to rotate clockwise about the rotation central axis J1. As a result, the wire main body 217w of the unlocking wire 217 is pulled by the drive link 214, and the locked state of the left and right connecting lock mechanism main bodies 82 is released. Here, when the operating handle 47 is not pulled rearward, as shown in Fig. 12, the force transmission pin 215p of the drive link 214 and the protrusion 213x of the intermediate link 213 are not engaged in the rotation direction, and therefore, even if the release lever 200r is pulled rearward, the operating force is not transmitted to the left and right connecting lock mechanism main bodies 82.

[0049] <About the link lock release mechanism 230> The link lock release mechanism 230 is a mechanism that releases the unfolded, locked state of the link lock mechanism 50 of the front link mechanism 30 when the vehicle-mounted folding cart 10 is mounted on the bed 2 of the vehicle 1. The link lock release mechanism 230 is configured so that it can release the unfolded, locked state of the link lock mechanism 50 when the left and right front auxiliary wheels 60 of the vehicle-mounted folding cart 10 are placed on the bed 2 of the vehicle 1. As shown in the overall configuration diagram of FIG. 18 , the link lock release mechanism 230 includes a release lever 200r that performs the unlocking operation, an upper-stage side force transmission mechanism 230p that is provided on the upper stage of the unlocking operation box 200, and an auxiliary wheel mounting detection mechanism 70.

[0050] As shown in Fig. 18, the upper-stage force transmission mechanism 230p includes a lever-side link 232, an intermediate link 233, a drive link 234, and an auxiliary wheel position interlocking link 235. The operation of the upper-stage force transmission mechanism 230p is basically the same as that of the lower-stage force transmission mechanism 210p described above. That is, the lever-side link 232 is configured to be horizontally rotatable about the rotation center axis J1, and the free rotation end of the lever-side link 232 is connected to the left end of the release lever 200r by a rod-shaped link 231. In addition, a square-shaped protrusion (not shown) that can engage with the force transmission pin 202 of the intermediate link 233 is formed at a midpoint of the lever-side link 232.

[0051] As shown in Fig. 18, the intermediate link 233 is provided in a state in which it can rotate horizontally around the rotation center axis J1, and the force transmission pin 202 described above is attached to the position of the slit portion 233h of the intermediate link 233. When the switching lever 200y is in the clockwise rotation limit position (mounted position), as shown in Fig. 18, the action of the switching lever 200y causes the square convex portion of the lever-side link 232 and the force transmission pin 202 of the intermediate link 233 to engage in the rotation direction. The drive link 234 is a link that transmits the unlocking operation force of the release lever 200r to the lock claw 53 of the link lock mechanism 50, and is configured to be horizontally rotatable around the rotation center axis J1. One end of the drive link 234 is connected to the rotation center axis J1, and the other end (the free rotation end) is connected to one end of the wire main body 237w of the unlocking wire 237. As shown in FIG. 18, the other end of the wire main body 237w of the unlocking wire 237 is branched into left and right parts via branch parts 237z and connected to the locking claws 53 of the left and right link lock mechanisms 50.

[0052] A slit 234h is formed near the free rotation end of the drive link 234, and a force transmission pin 235p is attached to the slit 234h. A protrusion (not shown) on the end of the intermediate link 233 is disposed along the slit 234h at the end of the slit 234h of the drive link 234 that is closer to the rotation center. As shown in FIG. 18, the auxiliary wheel position interlocking link 235 is configured to be rotatable horizontally around the rotation center axis J3. An arc-shaped hole (not shown) is formed at one end of the auxiliary wheel position interlocking link 235, and the force transmission pin 235p of the drive link 234 is engaged with the arc-shaped hole so as to be movable along the arc-shaped hole. As shown in FIGS. 18 and 19, the arc-shaped hole is formed so that its center coincides with the rotation center axis J1 when the auxiliary wheel position interlocking link 235 is in the left rotation limit position. As shown in FIG. 18 and other figures, one end of the wire main body 74w of the position detection wire 74 of the training wheel mounting detection mechanism 70 is connected to the other end of the training wheel position interlocking link 235.

[0053] The training wheel mounting detection mechanism 70 detects when the left and right front training wheels 60 of the vehicle-mounted folding dolly 10 are mounted on the loading platform 2 of the vehicle 1. Here, the left and right front training wheels 60 are supported by front movable brackets 62, as shown in FIG. 18 . The front movable brackets 62 are connected to the front end of the skeletal frame 21 of the dolly main body 20 in a manner that allows them to rotate up and down, and the front training wheels 60 are attached to the front surface of the front movable brackets 62 on the side of the free rotation end, as shown by the two-dot chain line in FIG. 18 . When the vehicle-mounted folding dolly 10 is mounted on the loading platform 2 of the vehicle 1, the front training wheels 60 abut against the front training wheel guide portions 2f of the loading platform 2, and as the vehicle-mounted folding dolly 10 is pushed forward, the inclined front training wheel guide portions 2f rise onto the loading platform surface. As a result, the front movable brackets 62 rotate upward to their upper limit rotation position as the front training wheels 60 rise.

[0054] As shown in FIG. 18 , the training wheel mounting detection mechanism 70 includes a training wheel interlocking bracket portion 72 configured to be able to rotate up and down integrally with the front movable bracket 62. The other end of the wire main body 74w of the position detection wire 74 is connected to the upper tip of the training wheel interlocking bracket portion 72. A wire bracket 73 supporting the tube portion of the other end of the position detection wire 74 is attached to the front end of the skeletal frame 21 of the dolly main body 20. As a result, when the front training wheel 60 passes through the front training wheel guide portion 2f of the loading platform 2 and gets on the loading platform surface of the loading platform 2, the training wheel interlocking bracket portion 72 rotates left (upward) together with the front movable bracket 62 in FIG. 18 , and the wire main body 74w of the position detection wire 74 is pulled. As a result, the training wheel position interlocking link 235 of the upper-stage side force transmission mechanism 230p rotates left about the rotation center axis J3. As a result, the drive link 234 and the intermediate link 233 are engaged in the rotation direction via the force transmission pin 235p and the like.

[0055] <Operation of the link lock release mechanism 230> 18, when the switching lever 200y is held in the right rotation limit position (mounted position), the lever-side link 232 and the intermediate link 233 engage in the rotation direction via the force transmission pin 202 and the like. In this state, when the front training wheel 60 is placed on the surface of the loading platform 2 through the front training wheel guide portion 2f of the loading platform 2, the wire main body 74w of the position detection wire 74 is pulled, causing the training wheel position interlocking link 235 to rotate counterclockwise around the rotation central axis J3. As a result, the drive link 234 and the intermediate link 233 engage in the rotation direction via the force transmission pin 235p and the like.

[0056] 19, when the release lever 200r is pulled rearward, the lever-side link 232 rotates counterclockwise about the rotational axis J1, and the rotational force of the lever-side link 232 is transmitted to the drive link 234 via the intermediate link 233, causing the drive link 234 to rotate counterclockwise about the rotational axis J1. As a result, the wire main body 237w of the unlocking wire 237 is pulled by the drive link 234, displacing the locking claws 53 of the left and right link locking mechanisms 50 inward in the vehicle width direction, thereby releasing the engagement between the stopper surfaces 53r of the locking claws 53 and the locking pieces 34r of the slide portion 34 (the deployment lock state is released). Note that when the front training wheel 60 is not placed on the cargo bed 2, the drive link 234 and the intermediate link 233 do not engage in the rotational direction, and therefore, even if the release lever 200r is pulled rearward, the operating force is not transmitted to the left and right link locking mechanisms 50.

[0057] <About the fall prevention mechanism 90> The fall prevention mechanism 90 is a mechanism that hooks the front of the dolly main body 20 onto the rear of the bed 2 of the vehicle 1 if the front link mechanism 30 is not fully deployed when the vehicle-mounted folding dolly 10 is being lowered from the bed 2 of the vehicle 1. As shown in FIG. 20 , the fall prevention mechanism 90 includes a fall prevention hook 92 provided at the front center of the dolly main body 20, a hook receiving portion 94 provided at the rear center of the bed 2 of the vehicle 1, and a lock detection mechanism 96 that detects the locked state of the link lock mechanism 50. The fall prevention hook 92 is connected to the front center of the skeletal frame 21 of the dolly main body 20 in a manner that allows it to rotate up and down. A hook-shaped hook main body 92m is formed at the lower end of the fall prevention hook 92. One end of a wire main body 93w of a detection wire 93 in the lock detection mechanism 96 is connected to the height center of the fall prevention hook 92.

[0058] As described above, the lock detection mechanism 96 detects the locked state of the link lock mechanism 50. If the link lock mechanism 50 is not locked, it determines that the front link mechanism 30 is not fully deployed and activates the fall prevention hook 92. As shown in FIGS. 3 and 7, the lock detection mechanism 96 is installed near the link lock mechanism 50 on the right side of the truck. As shown in FIGS. 7, 20, and 21, the lock detection mechanism 96 includes a detection piece 34s provided on the slide portion 34 of the support arm 33 of the front link mechanism 30 and a detection receiving portion 96m attached to the underside of the bed deck frame 22 via a front-rear slide portion 96b. The other end of the wire main body 93w of the detection wire 93 is connected to the detection receiving portion 96m. The tube portion at the other end of the detection wire 93 is fixed to the underside of the bed deck frame 22 by a wire bracket 93x.

[0059] When the front link mechanism 30 is unfolded from the folded, stored state, the slide portion 34 of the support arm 33 of the front link mechanism 30 is positioned rearward of the receiving surface 96u of the detection receiving portion 96m of the lock detection mechanism 96. That is, the detection piece 34s of the slide portion 34 of the support arm 33 is spaced apart from the receiving surface 96u of the detection receiving portion 96m of the lock detection mechanism 96. However, when the slide portion 34 of the support arm 33 advances along the link rail 31 to the unfolded position of the front link mechanism 30 (the link lock mechanism 50 is in the unfolded, locked state), as shown in FIGS. 7 and 20 , the detection piece 34s of the slide portion 34 presses the receiving surface 96u of the detection receiving portion 96m forward (see the arrow in FIG. 20 ). As a result, the wire main body 93w of the detection wire 93 is pulled forward, and the fall prevention hook 92 is pulled upward by the wire main body 93w hooked on the pulley 21p.

[0060] In this state, the hook main body 92m of the fall prevention hook 92 provided at the front center of the dolly main body 20 no longer engages with the hook receiving portion 94 provided at the rear center of the loading platform 2. Furthermore, when the slide portion 34 of the support arm 33 has not advanced to the deployed position of the front link mechanism 30, the detection piece 34s of the slide portion 34 of the support arm 33 does not press forward against the receiving surface 96u of the detection receiving portion 96m, and therefore the fall prevention hook 92 is not sufficiently pulled up. As a result, the hook main body 92m of the fall prevention hook 92 provided at the front center of the dolly main body 20 engages with the hook receiving portion 94 provided at the rear center of the loading platform 2, and the front center of the dolly main body 20 is engaged with the hook receiving portion 94 of the loading platform 2.

[0061] <Operation of the in-vehicle folding cart 10> When the vehicle-mounted folding dolly 10 is being used as a dolly (when luggage is placed on it), the front link mechanism 30 and the rear link mechanism 40 are in the unfolded state, and the link lock mechanism 50 of the front link mechanism 30 is held in the unfolded / locked state, as shown in FIG. 22. The operating handle 47 is pulled rearward and held in the pulled-out rear end position by the handle lock 49. As a result, the rear link mechanism 40 is locked in the unfolded state. When the vehicle-mounted folding dolly 10 is to be mounted on the bed 2 of the vehicle 1 from this state, first, the switching lever 200y is rotated horizontally toward the mounting position, as shown in FIG. 18. As a result, the lever-side link 232 and the intermediate link 233 of the upper-side force transmission mechanism 230p in the unlocking operation box 200 are engaged in the rotational direction via the force transmission pin 202, etc.

[0062] In this state, the vehicle-mounted folding cart 10 is moved forward, and as shown in Fig. 22, the left and right front auxiliary wheels 60 of the vehicle-mounted folding cart 10 are brought into contact with the left and right front auxiliary wheel guide portions 2f of the loading platform 2, and placed on the loading platform surface of the loading platform 2 through the front auxiliary wheel guide portions 2f. As a result, as shown in Fig. 18, the auxiliary wheel interlocking bracket portion 72 of the auxiliary wheel mounting detection mechanism 70 rotates upward (rotates left in Fig. 18) together with the front movable bracket 62 of the front auxiliary wheel 60, pulling the wire main portion 74w of the position detection wire 74 and rotating the auxiliary wheel position interlocking link 235 left. As a result, the intermediate link 233 and the drive link 234 engage in the rotational direction via the force transmission pin 235p, etc.

[0063] In this state, when the release lever 200r is pulled rearward, the lever-side link 232 rotates counterclockwise about the rotation central axis J1, and the rotational force of the lever-side link 232 is transmitted to the drive link 234 via the intermediate link 233, causing the drive link 234 to rotate counterclockwise about the rotation central axis J1, as shown in Figure 19. As a result, the wire main body 237w of the unlocking wire 237 is pulled by the drive link 234, and the lock claws 53 of the left and right link lock mechanisms 50 are displaced inward in the vehicle width direction, thereby releasing the deployment lock state.

[0064] In this state, when the vehicle-mounted folding dolly 10 continues to move forward, as shown in FIG. 23, the front arms 32 of the left and right front link mechanisms 30 are pushed relatively rearward by the rear end of the bed 2, causing the left and right front arms 32 to rotate rearward (rotate left in FIG. 23) against the spring force. Also, the slide portions 34 of the support arms 33 of the front link mechanisms 30 slide rearward along the link rails 31. As a result, the front link mechanisms 30 are folded at a position below the skeletal frame 21 of the dolly main body 20. Also, during the process of folding the front link mechanisms 30, as shown in FIG. 24, the climbing guide portions 32g of the left and right front arms 32 climb onto the block portions 2b of the bed 2 of the vehicle 1, causing the left and right front arms 32 to rotate further upward and be held in the stored position. Then, after the climbing guide portion 32g of the front arm 32 climbs onto the block portion 2b of the loading platform 2, the left and right rear auxiliary wheels 67 of the cart main body 20 pass through the rear auxiliary wheel guide portion 2h of the loading platform 2 and move onto the loading platform surface, as shown in Figure 25.

[0065] Then, when the vehicle-mounted folding dolly 10 has advanced to its forward limit position relative to the loading platform 2 of the vehicle 1, the left and right connection lock mechanism main bodies 82 of the connection lock mechanism 80 fixed to the vertical frame of the dolly main body 20 connect with the left and right strikers 81 provided at the rear end of the loading platform 2, as shown in Figure 25. In other words, with the vehicle-mounted folding dolly 10 mounted on the loading platform 2 of the vehicle 1, the vehicle-mounted folding dolly 10 and the loading platform 2 are connected. In this state, the lift-up prevention protrusion 98 provided at the center of the front end of the dolly main body 20 fits under the presser bar (not shown) of the loading platform 2, preventing the vehicle-mounted folding dolly 10 from lifting up relative to the loading platform 2.

[0066] Next, the handle lock 49 of the operating handle unit 47 is operated in the unlocking direction, and then the operating handle unit 47 is pushed forward. As a result, as shown in Figures 8 to 10, the upper end of the V-shaped link 45 is pulled forward via the handle bracket unit 47b of the rear link mechanism 40, and the bracket unit 44b of the intermediate link 44 is pulled up. As a result, the left and right rear lower arms 43 rotate forward and upward (rotate right in the figure) relative to the skeletal frame 21 of the dolly main body 20, and the rear link mechanism 40 is folded (see Figure 10). In other words, the rear link mechanism 40 is stored so that the rear wheels 40b are positioned below the loading platform 2.

[0067] Next, when the vehicle-mounted folding cart 10 with luggage placed thereon is to be lowered from the bed 2 of the vehicle 1, first, the switching lever 200y is rotated horizontally to the lowering position as shown in Fig. 11. This causes the lever-side link 212 and the intermediate link 213 in the lower-stage-side force transmission mechanism 210p in the unlocking operation box 200 to engage in the rotational direction via the force transmission pin 201, etc.

[0068] Next, the operating handle 47 is pulled rearward. As a result, as shown in FIG. 15, the pressing portion 222s of the detection bracket 222 of the handle pulling detection mechanism 220 presses the pressure receiving portion 224u of the detection sensor portion 224, and the wire main body 218w of the position detection wire 218 is pulled. As a result, the handle position interlocking link 215 of the lower-side force transmission mechanism 210p rotates clockwise about the rotation center axis J2, and the drive link 214 and the protruding projection 213x of the intermediate link 213 engage in the rotational direction via the force transmission pin 215p and the like. Furthermore, as the operating handle 47 is pulled rearward, the rear link mechanism 40 is unfolded, and the rear wheel 40b touches the ground, as shown in FIG. 8.

[0069] 17, when the release lever 200r is pulled rearward, the lever-side link 212 rotates clockwise about the rotation center axis J1, and the rotational force of the lever-side link 212 is transmitted to the drive link 214 via the intermediate link 213, causing the drive link 214 to rotate clockwise about the rotation center axis J1. As a result, the wire main body 217w of the unlocking wire 217 is pulled by the drive link 214, and the left and right connecting lock mechanism main bodies 82 are released from the locked state. In this state, the vehicle-mounted folding cart 10 can be pulled rearward from the bed 2 of the vehicle 1.

[0070] When the vehicle-mounted folding dolly 10 is pulled rearward, the front arms 32 of the left and right front link mechanisms 30 rotate to the right (in the unfolding direction) in Figures 23 and 24 due to the weight of the front wheels 30f and the like and the spring force. Furthermore, during the unfolding process of the left and right front link mechanisms 30, the slide portions 34 of the support arms 33 slide forward along the link rails 31. When the left and right front link mechanisms 30 are unfolded, as shown in Figure 7, the locking pieces 34r of the slide portions 34 of the support arms 33 climb over the locking claws 53 of the link lock mechanisms 50 and reach the front side of the locking claws 53. In this state, the locking pieces 34r of the slide portions 34 of the support arms 33 engage with the stopper surfaces 53r of the locking claws 53, placing the link lock mechanisms 50 in an unfolded locked state. When the left and right front link mechanisms 30 are unfolded, the front wheels 30f come into contact with the ground.

[0071] 7 and 20, when the link lock mechanism 50 is in the locked state, the detection piece 34s of the slide portion 34 of the support arm 33 presses the receiving surface 96u of the detection receiving portion 96m of the lock detection mechanism 96 forward (see arrow). This pulls the wire main body 93w of the detection wire 93 forward, and the fall prevention hook 92 is pulled upward by the wire main body 93w. In this state, the hook main body 92m of the fall prevention hook 92 provided at the front center of the dolly main body 20 no longer engages with the hook receiving portion 94 provided at the rear center of the loading platform 2. In other words, the vehicle-mounted folding dolly 10 can be separated from the loading platform 2 and used as a dolly.

[0072] <Advantages of the vehicle-mounted folding cart 10 according to this embodiment> According to the in-vehicle folding dolly 10 of this embodiment, when the dolly main body 20 is mounted on or removed from the loading platform 2 of the vehicle 1, the weight of the dolly main body 20 is supported at the front and rear by at least one of the front wheels 30f and the front auxiliary wheels 60, and one of the rear wheels 40b and the rear auxiliary wheels 67. Therefore, when an operator moves the dolly main body 20 forward or backward to mount or remove it from the loading platform 2 of the vehicle 1, the weight of the dolly main body 20 is not applied to the operator. In other words, the operator can mount or remove the dolly main body 20 on or from the loading platform 2 of the vehicle 1 by applying a force required to move the dolly main body 20 forward or backward.

[0073] That is, in the process of loading the dolly main body 20 onto the loading platform 2 of the vehicle 1 or unloading it from the loading platform 2, the weight of the dolly main body 20 is borne by the front auxiliary wheels 60 and the rear wheels 40b. After the dolly main body 20 is loaded onto the loading platform 2 of the vehicle 1, the weight of the dolly main body 20 is borne by the front auxiliary wheels 60 and the rear auxiliary wheels 67. After the dolly main body 20 is unloaded from the loading platform 2 of the vehicle 1, the weight of the dolly main body 20 is borne by the front wheels 30f and the rear wheels 40b. Furthermore, because the front link mechanism 30 is folded so as to fit under the dolly main body 20, the folded front link mechanism 30 does not get in the way. In addition, the rear link mechanism 40 is folded so as to fit under the loading platform 2 of the vehicle 1 after the bogie body 20 is mounted on the loading platform 2 of the vehicle 1, so the folded rear link mechanism 40 does not protrude to the rear of the vehicle and does not get in the way.

[0074] <Example of change> Here, the present invention is not limited to the above-described embodiment, and modifications are possible within the scope of the present invention. For example, in this embodiment, an example has been shown in which the front auxiliary wheels 60 and the rear auxiliary wheels 67 are provided at the front and rear of the bogie main body 20, but a configuration in which auxiliary wheels are added to the center is also possible. Furthermore, an example has been shown in which the front auxiliary wheels 60 are provided at the front of the skeletal frame 21 of the bogie main body 20, but a configuration in which the front auxiliary wheels are provided at the upper front part (rotation center side) of the front arm 32 of the front link mechanism 30 is also possible. [Explanation of symbols]

[0075] 1. Vehicle 2. Cargo bed 10. Folding cart for vehicles 20... Cart body 30 Front link mechanism 30f...Front wheel 40 Rear link mechanism 40b...Rear wheel 60···Front training wheels 67 Rear training wheels

Claims

1. A folding cart for vehicle use that can be used as a cart and can be loaded onto or unloaded from a loading platform of a vehicle by an operator moving it forward or backward, a cart body on which luggage can be placed; Front wheels and front auxiliary wheels provided at the front of the carriage body; Rear wheels and rear auxiliary wheels provided at the rear of the carriage body; It has When the carriage body is loaded onto or unloaded from the loading platform of the vehicle, the weight of the carriage body is supported at the front and rear by at least one of the front wheels and the front auxiliary wheels, and one of the rear wheels and the rear auxiliary wheels, the front wheels and the rear wheels are configured to support the weight of the bogie body on a road surface, the front auxiliary wheels and the rear auxiliary wheels are configured to support the weight of the carriage body on a loading platform of the vehicle, The front wheels are connected to the bogie body by a front link mechanism, The rear wheels are connected to the carriage body by a rear link mechanism, the front link mechanism and the rear link mechanism are movable between an unfolded position that supports the carriage body and a folded storage position, When the front link mechanism and the rear link mechanism are folded, the front auxiliary wheels and the rear auxiliary wheels support the weight of the dolly main body on the loading platform of the vehicle, The rear link mechanism in the unfolded position is folded so that the cart body rotates forward and enters the underside of the vehicle bed after it is mounted on the vehicle bed.

2. The folding cart for vehicle use according to claim 1, When the cart body moves forward and is loaded onto the loading platform of the vehicle, the front link mechanism in the unfolded position is pushed relatively by the loading platform of the vehicle and rotates rearward, thereby folding the cart.

3. The vehicle-mounted folding cart according to claim 1 or 2, The cart body is configured so that it can be loaded onto or unloaded from the loading platform of the vehicle with luggage placed thereon.

Images