Folding cart for vehicles

Abstract

To prevent the weight of a carriage body portion from being added to a worker, when unloading the carriage body portion from a loading platform of a vehicle.SOLUTION: An on-vehicle folding carriage includes a carriage body portion on which a cargo can be placed, a coupling lock mechanism 80 that couples the carriage body portion and a loading platform of a vehicle while the carriage body portion is mounted on the loading platform of the vehicle, a coupling lock releasing mechanism that releases a coupling lock state of the coupling lock mechanism 80, wheels 40b supporting the carriage body portion on a road surface, link mechanisms 43 that are mechanisms coupling the wheels 40b to the carriage body portion, and are configured to deploy or fold, and an operation handle portion 47 that operates the link mechanisms 43 in a deploying direction or the folding direction. The coupling lock releasing mechanism is configured to release the coupling lock state of the coupling lock mechanism 80 while the operation handle portion 47 deploys the link mechanisms 43.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a folding cart for mounting on a vehicle that can be used as a cart and 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. The vehicle-mounted folding dolly 100 described in Patent Document 1 includes a dolly body 102 configured with a frame, as shown in FIG. 26. A standing handle 102h is provided at the rear of the dolly 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 front lower side of the dolly body 102. The vehicle-mounted folding dolly 100 includes a front link mechanism 104 that connects the front wheels 103 to the front part of the dolly body 102, and a rear link mechanism 106 that connects the rear wheels 105 to the rear part of the dolly body 102.

[0003] When the dolly body 102 of the vehicle-mounted folding dolly 100 is to be mounted on the loading platform 110 of the vehicle, the worker pushes the handle 102h of the dolly body 102 to move the dolly body 102 forward toward the loading platform 110. As a result, as shown in FIG. 27, the front auxiliary wheels 102f of the dolly body 102 are placed on the loading platform 110 of the vehicle, and the front weight of the dolly body 102 is supported by the front auxiliary wheels 102f. In this state, the worker further moves the dolly body 102 forward, so that 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 body 102 backward. As a result, the front link mechanism 104 and the rear link mechanism 106 of the dolly body 102 are folded while rotating backward, and the dolly body 102 is mounted on the loading platform 110 of the vehicle. In this state, the dolly main body 102 is connected to the vehicle bed 110 by a connection lock mechanism (not shown). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2004-299494 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-described vehicle-mounted folding dolly 100, when the dolly body 102 is to be removed from the loading platform 110 of the vehicle, it is first necessary to release the locked state of the coupling lock mechanism (not shown). However, in the released state, the rear link mechanism 106 of the dolly body 102 is not deployed, and the rear wheels 105 are not in contact with the road surface. Therefore, when an operator moves the dolly body 102 backward to remove it from the loading platform 110 of the vehicle, the operator needs to support the rear of the dolly body 102 until the rear link mechanism 106 is deployed and the rear wheels 105 come into contact with the road surface. Therefore, the burden on the operator when removing the dolly body 102 from the loading platform 110 of the vehicle is large.

[0006] The present invention has been made to solve the above-mentioned problems, and the problem that the present invention aims to solve is to prevent the weight of the trolley main body from being placed on the worker when lowering the trolley main body from the vehicle bed. [Means for solving the problem]

[0007] The above-mentioned problems are solved by the inventions. The first invention is a vehicle-mounted foldable dolly that can be used as a dolly and can be mounted on or removed from a vehicle bed by an operator moving it forward or backward, the dolly having a dolly body on which luggage can be placed, a connection lock mechanism that connects the dolly body to the vehicle bed when the dolly body is mounted on the vehicle bed, a connection lock release mechanism that releases the connection lock state of the connection lock mechanism, wheels that support the dolly body on a road surface, a link mechanism that is a mechanism that connects the wheels to the dolly body and is configured to be unfoldable or foldable, and an operating handle unit that operates the link mechanism in the unfolding direction or the folding direction, and the connection lock release mechanism is configured to release the connection lock state of the connection lock mechanism when the operating handle unit unfolds the link mechanism.

[0008] According to the present invention, the connection lock release mechanism is configured to be able to release the connection lock state of the connection lock mechanism when the operating handle unit has deployed the link mechanism. Here, when the operating handle unit has deployed the link mechanism, the wheels come into contact with the road surface and are able to bear the weight of the dolly body unit. In this state, the connection lock release mechanism is able to release the connection lock state of the connection lock mechanism, i.e., the connection between the dolly body unit and the vehicle bed. Therefore, when an operator moves the dolly body unit to lower it from the vehicle bed, the weight of the dolly body unit is not applied to the operator.

[0009] The second invention has a front link mechanism which is a mechanism for connecting the front wheels to the front part of the bogie main body and is configured to be unfoldable or foldable, and a rear link mechanism which is a mechanism for connecting the rear wheels to the rear part of the bogie main body and is configured to be unfoldable or foldable, wherein the operating handle part is configured to operate the rear link mechanism in the unfolding direction by being pulled rearward relative to the bogie main body, and the connection lock release mechanism is configured to be able to release the connection lock state of the connection lock mechanism when the operating handle part is pulled rearward and the rear link mechanism is unfolded.

[0010] According to a third aspect of the present invention, the coupling lock mechanism includes a coupling lock mechanism main body provided at the rear of the bogie main body, and a striker provided at the rear end of the vehicle bed and configured to be coupleable with the coupling lock mechanism main body. That is, by coupling the coupling lock mechanism main body at the rear of the bogie main body to the striker provided at the rear end of the vehicle bed, the bogie main body is coupled to each other while mounted on the vehicle bed.

[0011] According to the fourth aspect of the present invention, the connection lock release mechanism includes a handle pull-out detection mechanism that detects when the operating handle portion is pulled out rearward relative to the carriage body portion.

[0012] According to a fifth aspect of the present invention, the connection lock release mechanism includes a release lever that applies an operating force for unlocking to a connection lock mechanism main body of the connection lock mechanism, and a force transmission mechanism to which the operating force of the handle pull-out detection mechanism and the operating force of the release lever are input, and the force transmission mechanism transmits the operating force from the release lever to the connection lock mechanism main body in a state in which both the operating force from the handle pull-out detection mechanism and the operating force from the release lever are input. In other words, the force transmission mechanism enables the connection lock release mechanism to release the connection between the bogie main body and the vehicle bed in a state in which the operating handle portion deploys the link mechanism.

[0013] According to the sixth aspect of the present invention, the operating handle is provided with a handle lock that holds the operating handle in the deployed or folded position of the link mechanism. That is, the handle lock prevents the operating handle from moving unintentionally from the deployed position to the folded position, etc. Effect of the Invention

[0014] According to the present invention, when the dolly body is lowered from the bed of the vehicle, the weight of the dolly body is not placed on the worker. [Brief description of the drawings]

[0015] [Figure 1] 1 is an overall perspective view showing a vehicle-mounted folding dolly according to a first embodiment of the present invention and a loading platform of a vehicle on which the dolly is mounted. [Diagram 2] 2 is a plan view of a loading platform of a vehicle on which the vehicle-mounted folding cart is mounted. FIG. [Diagram 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. [Diagram 5] FIG. 2 is a side view of the vehicle-mounted folding dolly. [Figure 6] 6 is a side view (enlarged view taken along the line 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] 4 is a side view illustrating a rear link mechanism of the vehicle-mounted folding cart in an unfolded state. FIG. [Figure 9] 5A to 5C are side views illustrating a process of unfolding a rear link mechanism of the vehicle-mounted folding cart. [Figure 10] 4 is a side view illustrating a folded state of a rear link mechanism of the vehicle-mounted folding cart. FIG. [Figure 11] 4 is an overall configuration diagram (locked state) of the coupling lock release mechanism of the vehicle-mounted folding cart; FIG. [Figure 12] 13 is a plan view of a handle pull-out detection mechanism and a lower-stage force transmission mechanism of the connection lock release mechanism. FIG. [Figure 13] 13 is a side view of a handle-pulling-out detection mechanism of the connection lock release mechanism. FIG. [Figure 14] 14 is a vertical cross-sectional view (cross-sectional view taken along the line XIV-XIV in FIG. 13) of the handle-pulling-out detection mechanism of the connection lock releasing mechanism. [Figure 15] 13A and 13B are plan views illustrating the operation of a handle withdrawal detection mechanism of the connection lock release mechanism. [Figure 16] 11A to 11C are side views illustrating the operation of a handle pull-out detection mechanism of the connection lock release mechanism. [Figure 17] FIG. 4 is an overall configuration diagram of the connection lock release mechanism (in an unlocked state). [Figure 18] 4 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 to 5C are diagrams illustrating the operation of the link lock mechanism and the link lock release mechanism. [Figure 20] 10 is a configuration diagram showing the relationship between a fall prevention mechanism of the vehicle-mounted folding cart and a lock detection mechanism of the link lock mechanism. FIG. [Figure 21] FIG. 4 is a vertical 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 a loading platform of a vehicle. [Diagram 23] 10A to 10C are side views sequentially showing how the vehicle-mounted folding cart is mounted on a loading platform of a vehicle. [Figure 24] 10A to 10C are side views sequentially showing how the vehicle-mounted folding cart is mounted on a loading platform of a vehicle. [Diagram 25] 10A to 10C are side views sequentially showing how the vehicle-mounted folding cart is mounted on a loading platform of a vehicle. [Figure 26] FIG. 1 is a side view of a conventional vehicle-mounted folding cart. [Figure 27] 1A to 1C are side views showing a process of mounting a conventional vehicle-mounted folding cart. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] [Embodiment 1] Hereinafter, a vehicle-mounted folding cart according to a first embodiment of the present invention will be described with reference to Fig. 1 to Fig. 25. The vehicle-mounted folding cart 10 according to this embodiment is a cart that can be used alone as a cart and is configured so that it can be mounted with luggage placed on it on a vehicle 1 equipped with a platform 2 dedicated to carts. Here, the front, rear, left, right, and up and down shown in the figures correspond to the front, rear, left, right, and up and down of the vehicle 1 and the vehicle-mounted folding cart 10.

[0017] <Overview of the vehicle-mounted folding cart 10> As shown in Fig. 1, the vehicle-mounted folding cart 10 is a push cart, and includes a cart body 20 including a loading platform deck frame 22 and the like. The loading platform deck frame 22 is a portion on which luggage is placed, and includes a substantially rectangular edge frame (figure number omitted) and an intermediate frame (figure number omitted) that spans 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 position of the loading platform deck frame 22. Note that the push handle 23 is omitted in Fig. 3 and subsequent figures.

[0018] As shown in Figs. 3 and 4, the trolley 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-rear direction and a vertical frame portion (not shown) that extends downward at the rear end position of the horizontal frame portion. The horizontal frame portion of the inverted L-shaped frame 21y supports the bed deck frame 22. A link rail 31 (described later) that also extends in the front-rear direction of the trolley body 20 is attached to the outer surface of the horizontal frame portion of the inverted L-shaped frame 21y.

[0019] As shown in Figs. 3 to 5, front wheels 30f are connected to the left and right front parts 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 to a connecting bar 30r as shown in Fig. 1. Rear wheels 40b are connected to the left and right rear parts 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 part of the skeleton frame 21 of the dolly body 20 in a vertically rotatable state, and a support arm 33 connected to an intermediate position of the front arm 32 in a vertically rotatable state. A front wheel 30f is attached to the rotatable end side (lower end) of the front arm 32. A slide part 34 is connected to the rotatable end side (upper end) of the support arm 33 in a vertically rotatable state. The slide part 34 is configured to be slidable forward and backward along a link rail 31 extending in the front-rear direction. Therefore, when the front arm 32 rotates left (rotates backward) relative to the skeleton frame 21 of the dolly body 20 in Fig. 6 and the slide part 34 of the support arm 33 slides backward along the link rail 31, the front link mechanism 30 is folded at a lower position of the skeleton frame 21. That is, the front link mechanism 30 is stored in a storage position below the skeleton frame 21.

[0021] 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 deployed (deployed 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 (deploy). Also, a link lock mechanism 50 (described later) that holds the front link mechanism 30 in the deployed 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, the lower ends of which are connected to rear wheels 40b, an intermediate link 44 connecting the middle positions of the left and right rear lower arms 43, and a V-shaped link 45 connected to the center of the intermediate link 44. As shown in Fig. 5, the pair of left and right rear lower arms 43 are connected at their upper ends C (rotation center C) to the vertical frame portion of the inverted L-shaped frame 21y of the bogie main body 20 in a state in which they can rotate up and down. As shown in Fig. 3, the intermediate link 44 connects the left and right rear lower arms 43 with a horizontal shaft portion 44j, and a bracket portion 44b protruding radially outward is provided at the longitudinal center portion of the shaft portion 44j.

[0023] As shown in Figures 3 and 8, the V-shaped link 45 is bent in a V-shape so as to be 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 vertically rotatable state. And, as shown in Figure 8, the upper end of the V-shaped link 45 is connected to a handle bracket portion 47b provided in the front end center portion of the operating handle portion 47 in a vertically rotatable state. The operating handle portion 47 is a handle for unfolding or folding the rear link mechanism 40, and is provided horizontally so as to protrude rearward below the rear end center portion of the bed deck frame 22, as shown in Figures 3, 4, etc.

[0024] As shown in FIG. 4 and other figures, the operating handle portion 47 is formed in a substantially rectangular shape from a U-shaped frame and two pipes (figure numbers omitted) connecting the front end portions of the U-shaped frame. At the midpoint of the two pipes of the operating handle portion 47, a handle bracket portion 47b to which the upper end portion of the V-shaped link 45 is connected is formed so as to protrude downward, as shown in FIG. 4, FIG. 8, and other figures. The operating handle portion 47 is supported from both the left and right sides in a state in which it can slide forward and backward by a handle rail 48 (see FIG. 3 and FIG. 4) attached to the inner surface of the inverted L-shaped frame 21y (horizontal frame portion) of the dolly main body portion 20. That is, when the operating handle portion 47 is pulled backward, the operating handle portion 47 slides backward along the handle rail 48. Also, when the operating handle portion 47 is pushed forward, the operating handle portion 47 slides forward along the handle rail 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 with respect to the skeletal frame 21 of the bogie main body portion 20, and the rear link mechanism 40 is deployed (deployed position). Also, 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 FIG. 9 and FIG. 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 dolly 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). A handle lock 49 is provided on the left side of the operating handle 47 as shown in FIGS. 8 to 10, for holding the operating handle 47 in a pushed-in front end position or pulled-out rear end position.

[0026] <About the front training wheel 60 and rear training wheel 67> 1, 3, etc., in the vehicle-mounted folding cart 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 cart main body 20 on the road surface. Also, the vehicle-mounted folding cart 10 is provided with 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) which bear the weight of the cart 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] The front auxiliary wheels 60 are supported by a front movable bracket 62, as shown in FIG. 5 and the like, and the upper end of the front movable bracket 62 is connected to the front end of the skeletal frame 21 (inverted L-shaped frame 21y) of the dolly main body 20 in a state in which it can rotate up and down. The left and right front auxiliary wheels 60 are configured to receive the weight of the dolly main body 20 near the lower side of the horizontal frame part of the inverted L-shaped frame 21y, and are arranged on the inner side in the vehicle width direction with respect to the left and right front wheels 30f, as shown in FIG. 4. The left and right rear auxiliary wheels 67 are fixed to the rear lower side of the horizontal frame part of the inverted L-shaped frame 21y of the dolly main body 20 via a rear fixing bracket 67b, as shown in FIG. 5 and the like. The left and right rear auxiliary wheels 67 are configured to receive the weight of the dolly 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 arranged on the inner side in the vehicle width direction with respect 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 for holding 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 square cylindrical guide portion 52 fixed to the skeleton frame 21 (connecting frame 21r) of the bogie body 20, and a lock claw 53 housed in the guide portion 52. As shown in Fig. 7, the link lock mechanism 50 includes a lock 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 skeleton frame 21 so as to extend along the vehicle width direction. The lock claw 53 is housed in the guide portion 52 in a state in which it is substantially square columnar and displaceable in the vehicle width direction, and its tip portion is configured to be able to protrude by a certain distance from the guide portion 52 outward in the vehicle width direction by a 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] When the slide portion 34 of the support arm 33 slides forward along the link rail 31 during the process of unfolding the front link mechanism 30, the lock piece 34r of the slide portion 34 comes into contact with the planar arc-shaped rear side surface of the lock claw 53, and pushes the lock claw 53 inward in the vehicle width direction against the spring force. Then, 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 lock claw 53 protrudes a certain distance outward in the vehicle width direction from the guide portion 52 due to the spring force, as shown in Fig. 7. As a result, the stopper surface 53r of the lock claw 53 and the lock piece 34r of the slide portion 34 of the support arm 33 engage with each other, and the front link mechanism 30 is unfolded while the link lock mechanism 50 is held in the unfolded locked state.

[0030] <Regarding the connection lock mechanism 80> The vehicle-mounted folding cart 10 is provided with a connection lock mechanism 80 that connects the vehicle-mounted folding cart 10 to the bed 2 of the vehicle 1 when the vehicle-mounted folding cart 10 is mounted on the bed 2 of the vehicle 1. As shown in Figs. 3 to 5 and other figures, the connection lock mechanism 80 is composed of a connection lock mechanism main body 82 fixed to the center in the height direction of the vertical frame parts of the left and right inverted L-shaped frames 21y of the cart main body 20, and left and right strikers 81 (see Fig. 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 the horizontal rod-shaped striker 81 enters a recess in the connection lock mechanism main body 82 from the front direction, so that the striker 81 and a hook (not shown) of the connection lock mechanism main body 82 are engaged by a 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 includes 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 unfolded lock state of the link lock mechanism 50 that holds the front link mechanism 30 in the unfolded state. The connection lock release mechanism 210 and the link lock release mechanism 230 include force transmission mechanisms 210p, 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 stored in the unlocking operation box 200. The unlocking operation box 200 is attached to the skeletal frame 21 of the dolly body 20 at the widthwise inner position of the operation handle portion 47, as shown in FIG. 3, FIG. 4, etc.

[0032] <Overview 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 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 lowered from the cart bed 2 of the vehicle 1. As shown in Fig. 3, the fall prevention mechanism 90 includes a fall prevention hook 92 provided in the center of the front of the cart body 20, a hook receiving portion 94 (see Figs. 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 Figs. 3 and 4) that detects the locked state of the link lock mechanism 50.

[0033] <Regarding cargo bed 2 of vehicle 1> The loading platform 2 of the vehicle 1 is formed in a substantially rectangular shape in plan view, as shown in Figs. 1 and 2. On both the left and right sides of the loading platform 2, a band-shaped block portion 2b formed higher than the loading platform surface by a certain dimension is formed so as to extend in the front-rear direction of the vehicle. The block portion 2b is a portion on which the riding guide portion 32g provided on the front arm 32 of the front link mechanism 30 of the vehicle-mounted folding cart 10 is placed, and the rear end portion of the block portion 2b forms a wedge-shaped inclined surface 2k. On the inside of the inclined surface 2k of the left and right block portions 2b in the vehicle width direction, the striker 81 of the connection lock mechanism 80 is provided so as to extend in the left-right direction. In addition, on the inside of the left and right strikers 81 in the vehicle width direction, an inclined rear auxiliary wheel guide portion 2h is provided which guides the left and right rear auxiliary wheels 67 of the vehicle-mounted folding cart 10 onto the loading platform surface of the loading platform 2. Furthermore, on the inside in the vehicle width direction of the left and right rear auxiliary wheel guide parts 2h, there is provided a front auxiliary wheel guide part 2f in the form of an inclined surface that guides the left and right front auxiliary wheels 60 of the vehicle-mounted folding cart 10 onto the bed surface of the bed 2. And, on the inside in the vehicle width direction (center side) of the right front auxiliary wheel guide part 2f, there is provided a hook receiving part 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 state of the connection lock mechanism 80 can be released in a state in which the operating handle unit 47 is pulled backward 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 configured from a release lever 200r that performs the unlocking operation, a lower-stage side force transmission mechanism 210p 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 that the operating handle unit 47 has been pulled backward with respect to the cart body unit 20.

[0035] Here, the unlocking operation box 200 is provided with a switching lever 200y for switching between a case where the vehicle-mounted folding cart 10 is mounted on the loading platform 2 of the vehicle 1 and a case where the vehicle-mounted folding cart 10 is removed from the loading platform 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 around 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 at the left rotation limit position (removal position) (see FIG. 11, etc.) when the vehicle-mounted folding cart 10 is removed from the loading platform 2 of the vehicle 1. Also, the switching lever 200y is held at the right rotation limit position (mounting position) (see FIG. 18, etc.) when the vehicle-mounted folding cart 10 is mounted on the loading platform 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 about the rotation center axis J1, and the free rotation end side 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 convex portion 212t that can be engaged with the force transmission pin 201 of the intermediate link 213 is formed at a midpoint of the lever-side link 212.

[0037] As shown in FIG. 11, the intermediate link 213 is placed on the lower side of the lever-side link 212 in a state in which it can rotate horizontally around the rotation center axis J1. The intermediate link 213 has a linear slit portion 213h formed in a protruding portion on one end side (right end side), and a protruding protrusion 213x (described later) formed in a tip portion on the other end side (left end side). The force transmission pin 201 described above is attached to the linear slit portion 213h of the intermediate link 213 so as to be movable along the slit portion 213h. Here, the switching lever 200y has an arc hole (illustration number omitted) formed at a position opposite to the lever operation unit across the rotation center axis J0. The arc hole is formed so that its center coincides with 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 hole of the switching lever 200y so as to be movable along the arc hole.

[0038] Here, when the switching lever 200y is in the left rotation limit position (lowered position), as shown in Fig. 11, the force transmission pin 201 of the intermediate link 213 moves 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 square 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 backward and the lever-side link 212 rotates rightward about the rotation center axis J1, the square convex portion 212t of the lever-side link 212 presses the force transmission pin 201 of the intermediate link 213 in the right rotation direction. Here, the center of the circular 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 center axis J1. Therefore, when the lever side link 212 rotates clockwise about the rotation central axis J1, the intermediate link 213 is pushed by the force transmission pin 201 and becomes able to rotate clockwise about the rotation central axis J1.

[0039] However, when the switching lever 200y rotates rightward from the left 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 backward and the lever-side link 212 rotates rightward about the rotation center axis J1, the lever-side link 212 only rotates rightward by itself, and the intermediate link 213 is held in its current position by the spring force.

[0040] As shown in FIG. 11, the driving 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 driving 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 driving 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 driving link 214. As shown in FIG. 11, the wire main body 217w of the unlock wire 217 is connected to the driving link 214 in a state in which one end side is hung on a pulley 217p, and the other end side is branched to the left and right via a branch part 217z and is connected to the left and right connection lock mechanism main bodies 82.

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

[0042] As shown in FIG. 11, the handle position interlocking link 215 is a substantially strip-shaped link, and its central portion in the length direction is connected to the rotation center axis J2, and is configured to be horizontally rotatable around the rotation center axis J2. An arc-shaped hole (see FIG. 15, figure 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. Here, 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 right rotation limit position, as shown in FIG. 15. In addition, 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, as shown in FIG. 11 and the like. The other end of the position detection wire 218 is connected to a handle pull-out detection mechanism 220.

[0043] As described above, the handle pull-out detection mechanism 220 is a mechanism for detecting that the operating handle unit 47 of the dolly body unit 20 has been pulled out backward, and is provided between the right side of the operating handle unit 47 and the right handle rail 48, as shown in Figs. 3, 11, etc. The handle pull-out detection mechanism 220 is composed of a detection bracket 222 fixed to the right front part of the operating handle unit 47, and a detection sensor unit 224 attached to the lower side of the bed deck frame 22 via a front-rear slide unit 224b (see Figs. 13 and 14), as shown in Figs. 11, 13, and 14. The other end side of the wire main body unit 218w of the position detection wire 218 is connected to the detection sensor unit 224. The tube portion on the other end side of the position detection wire 218 is fixed to the lower side of the bed deck frame 22 by a wire bracket 218b, as shown in Fig. 13, etc.

[0044] 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 separated in the front-rear direction as shown in Figs. 11 to 13. However, when the operating handle portion 47 is pulled rearward, the pressing portion 222s of the detection bracket 222 presses the pressure receiving portion 224u of the detection sensor portion 224 rearward as shown in Figs. 15 to 17, and the detection sensor portion 224 slides rearward along the front-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 around the rotation central axis J2 to the clockwise rotation limit position, as shown in Fig. 15. This causes the force transmission pin 215p of the driving link 214 to move along the slit portion 214h to the end of the slit portion 214h on the rotation center side by the action of the handle position interlocking link 215. As a result, the force transmission pin 215p of the driving link 214 and the protruding projection 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 at 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 part 47 is pulled backward, as shown in Fig. 15, the pressing part 222s of the detection bracket 222 of the handle pull-out detection mechanism 220 presses the pressing force receiving part 224u of the detection sensor part 224, and the detection sensor part 224 slides backward along the front-rear slide part 224b. As a result, the wire main body part 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 rightward around the rotation central axis J2.

[0047] As a result, the force transmission pin 215p of the driving 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 driving link 214 to engage with the protruding projection 213x of the intermediate link 213 in the rotation direction. When the operating handle portion 47 is pulled out 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 backward, the lever-side link 212 rotates rightward about the rotation axis J1, and the rotational force of the lever-side link 212 is transmitted to the driving link 214 via the intermediate link 213, causing the driving link 214 to rotate rightward about the rotation axis J1. As a result, the wire main body 217w of the unlocking wire 217 is pulled by the driving link 214, and the left and right connecting lock mechanism main bodies 82 are released from the locked state. Here, when the operating handle portion 47 is not pulled backward, as shown in Fig. 12, the force transmission pin 215p of the driving link 214 and the protruding projection 213x of the intermediate link 213 are not engaged in the rotation direction, so that even if the release lever 200r is pulled backward, the operating force is not transmitted to the left and right connecting lock mechanism main bodies 82.

[0049] <Regarding the link lock release mechanism 230> The link lock release mechanism 230 is a mechanism that releases the unfolded and 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 and 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 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 driving 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 side 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 convex portion (not shown) that can be engaged 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 axis J1, and the above-mentioned force transmission pin 202 is attached to the position of the slit portion 233h of the intermediate link 233. Then, in a state in which the switching lever 200y is in the right rotation limit position (mounting position), as shown in FIG. 18, the square convex portion of the lever side link 232 and the force transmission pin 202 of the intermediate link 233 are engaged in the rotation direction by the action of the switching lever 200y. The driving 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 axis J1. One end of the driving link 234 is connected to the rotation axis J1, and one end of the wire main body portion 237w of the unlocking wire 237 is connected to the other end (free rotation end). As shown in FIG. 18, the other end of the wire main body 237w of the unlocking wire 237 is branched to the left and right via branch portions 237z and connected to the lock claws 53 of the left and right link lock mechanisms 50.

[0052] A slit portion 234h is formed near the free rotation end side of the driving link 234, and a force transmission pin 235p is attached at the position of the slit portion 234h. In addition, at the end of the slit portion 234h of the driving link 234 on the rotation center side, a protruding protrusion (not shown) on the end side of the intermediate link 233 is arranged along the slit portion 234h. As shown in FIG. 18, the auxiliary wheel position interlocking link 235 is configured to be horizontally rotatable around the rotation center axis J3. An arc hole (not shown) is formed on one end side of the auxiliary wheel position interlocking link 235, and the force transmission pin 235p of the driving link 234 is engaged so as to be movable along the arc hole. The arc 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 FIG. 19. As shown in FIG. 18 and other figures, one end of a wire main body 74w of a position detection wire 74 of an auxiliary wheel mounting detection mechanism 70 is connected to the other end of the auxiliary wheel position interlocking link 235.

[0053] The auxiliary wheel mounting detection mechanism 70 is a mechanism that detects that the left and right front auxiliary wheels 60 of the vehicle-mounted folding cart 10 are mounted on the loading platform 2 of the vehicle 1. Here, the left and right front auxiliary wheels 60 are supported by the front movable bracket 62 as shown in FIG. 18. The front movable bracket 62 is connected to the front end of the skeletal frame 21 of the cart main body 20 in a state in which it can rotate up and down, and the front auxiliary wheels 60 are attached to the front surface of the front movable bracket 62 on the side of the free rotation end as shown by the two-dot chain line in FIG. 18. Then, when the vehicle-mounted folding cart 10 is mounted on the loading platform 2 of the vehicle 1, the front auxiliary wheels 60 come into contact with the front auxiliary wheel guide portion 2f of the loading platform 2, and in the process of the vehicle-mounted folding cart 10 being pushed forward, the front auxiliary wheels 60 come to ride up onto the loading platform surface from the inclined front auxiliary wheel guide portion 2f. As a result, the front movable bracket 62 rotates upward to the upper rotation limit position as the front auxiliary wheels 60 rise.

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

[0055] <Operation of the link lock release mechanism 230> When the switching lever 200y is held at the right rotation limit position (mounted position) as shown in Fig. 18, the lever side link 232 and the intermediate link 233 engage in the rotation direction via the force transmission pin 202, etc. In this state, when the front auxiliary wheel 60 is placed on the bed surface of the bed 2 through the front auxiliary wheel guide portion 2f of the bed 2, the wire main body portion 74w of the position detection wire 74 is pulled, causing the auxiliary 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, etc.

[0056] In this state, when the release lever 200r is pulled backward, as shown in Fig. 19, the lever-side link 232 rotates left about the rotation axis J1, and the rotational force of the lever-side link 232 is transmitted to the drive link 234 via the intermediate link 233, and the drive link 234 rotates left about the rotation axis J1. 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, and the engagement between the stopper surface 53r of the lock claw 53 and the lock piece 34r of the slide part 34 is released (the deployment lock state is released). Note that, when the front auxiliary wheel 60 is not placed on the loading platform 2, the drive link 234 and the intermediate link 233 are not engaged in the rotation direction, so that even if the release lever 200r is pulled backward, the operating force is not transmitted to the left and right link lock mechanisms 50.

[0057] <About the fall prevention mechanism 90> The fall prevention mechanism 90 is a mechanism that hooks the front of the dolly body 20 on the rear of the deck 2 of the vehicle 1 when the front link mechanism 30 is not fully deployed when the vehicle-mounted folding dolly 10 is lowered from the deck 2 of the vehicle 1. As shown in FIG. 20, the fall prevention mechanism 90 includes a fall prevention hook 92 provided at the center of the front of the dolly body 20, a hook receiving portion 94 provided at the center of the rear of the deck 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 center of the front of the skeletal frame 21 of the dolly body 20 in a state in which it can 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 the wire main body 93w of the detection wire 93 in the lock detection mechanism 96 is connected to the center of the height of the fall prevention hook 92.

[0058] As described above, the lock detection mechanism 96 is a mechanism for detecting the locked state of the link lock mechanism 50. When the link lock mechanism 50 is not in the locked state, the lock detection mechanism 96 operates the fall prevention hook 92 as the front link mechanism 30 is not fully deployed. As shown in the perspective views of FIG. 3 and FIG. 7, the lock detection mechanism 96 is installed near the link lock mechanism 50 on the right side of the dolly. As shown in FIG. 7, FIG. 20, and FIG. 21, the lock detection mechanism 96 is composed of a detection piece 34s provided on the slide part 34 of the support arm 33 of the front link mechanism 30 and a detection receiving part 96m attached to the lower side of the bed deck frame 22 via the front-rear slide part 96b. The other end side of the wire main body part 93w of the detection wire 93 is connected to the detection receiving part 96m. The tube part on the other end side of the detection wire 93 is fixed to the lower side of the bed deck frame 22 by a wire bracket 93x.

[0059] In the process of unfolding the front link mechanism 30 from the folded storage state, the slide portion 34 of the support arm 33 of the front link mechanism 30 is located 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 and the receiving surface 96u of the detection receiving portion 96m of the lock detection mechanism 96 are separated from each other. 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 lock 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 hung 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 does not hook on the hook receiving part 94 provided at the rear center of the loading platform 2. In addition, when the slide part 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 part 34 of the support arm 33 does not press the receiving surface 96u of the detection receiving part 96m forward, so that 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 hooks on the hook receiving part 94 provided at the rear center of the loading platform 2, and the front center of the dolly main body 20 is hooked on the hook receiving part 94 of the loading platform 2.

[0061] <Operation of the vehicle-mounted folding cart 10> When the vehicle-mounted folding cart 10 is used as a cart (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 lock state, as shown in FIG. 22. The operating handle portion 47 is pulled out rearward, and the operating handle portion 47 is 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 mounting the vehicle-mounted folding cart 10 on the bed 2 of the vehicle 1 from this state, first, the switching lever 200y is horizontally rotated toward the mounting position side, as shown in FIG. 18. As a result, the lever-side link 232 and the intermediate link 233 in the upper-stage force transmission mechanism 230p in the unlocking operation box 200 are engaged in the rotation direction via the force transmission pin 202, etc.

[0062] In this state, the vehicle-mounted folding cart 10 is moved forward, and 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 parts 2f of the loading platform 2, as shown in Fig. 22, and placed on the loading platform surface of the loading platform 2 through the front auxiliary wheel guide parts 2f. As a result, as shown in Fig. 18, the auxiliary wheel interlocking bracket part 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 body part 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 driving link 234 engage in the rotation 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 left 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 left about the rotation central axis J1, as shown in Fig. 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, releasing the deployment lock state.

[0064] In this state, when the vehicle-mounted folding cart 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 backward by the rear end of the bed 2, and the left and right front arms 32 rotate backward (rotate left in FIG. 23) against the spring force. Also, the slide parts 34 of the support arms 33 of the front link mechanisms 30 slide backward 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 cart main body 20. Also, during the process of folding the front link mechanisms 30, as shown in FIG. 24, the riding guide parts 32g of the left and right front arms 32 ride up on the block parts 2b of the bed 2 of the vehicle 1, and the left and right front arms 32 rotate further upward and are held in the stored position. Then, after the climbing guide portion 32g of the front arm 32 climbs up 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 portions 2h of the loading platform 2 and move onto the loading platform surface, as shown in Figure 25.

[0065] Then, at the stage where the vehicle-mounted folding cart 10 has advanced to the 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 part of the cart main body 20 are connected to the left and right strikers 81 provided at the rear end of the loading platform 2, as shown in Fig. 25. That is, with the vehicle-mounted folding cart 10 mounted on the loading platform 2 of the vehicle 1, the vehicle-mounted folding cart 10 and the loading platform 2 are connected to each other. In this state, a lift-up prevention protrusion 98 provided at the center of the front end of the cart main body 20 enters under the pressing bar (not shown) of the loading platform 2, preventing the vehicle-mounted folding cart 10 from lifting up relative to the loading platform 2.

[0066] Next, the handle lock 49 of the operating handle portion 47 is operated in the unlocking direction, and then the operating handle portion 47 is pushed forward. As a result, as shown in Figs. 8 to 10, the upper end of the V-shaped link 45 is pulled forward via the handle bracket portion 47b of the rear link mechanism 40, 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 dolly main body portion 20, and the rear link mechanism 40 is folded (see Fig. 10). That is, the rear link mechanism 40 is stored so that the rear wheels 40b enter under 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 side as shown in Fig. 11. This causes the lever-side link 212 and the intermediate link 213 in the lower-stage force transmission mechanism 210p in the unlocking operation box 200 to engage in the rotation direction via the force transmission pin 201, etc.

[0068] Next, the operating handle portion 47 is pulled out rearward. As a result, 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 portion 224, and the wire main body portion 218w of the position detection wire 218 is pulled. As a result, the handle position interlocking link 215 of the lower-stage side force transmission mechanism 210p rotates clockwise about the rotation center axis J2, and the driving link 214 and the protruding protrusion 213x of the intermediate link 213 engage in the rotation direction via the force transmission pin 215p and the like. In addition, as shown in FIG. 8, by pulling out the operating handle portion 47 rearward, the rear link mechanism 40 is deployed and the rear wheel 40b touches the ground.

[0069] In this state, as shown in Fig. 17, by pulling the release lever 200r backward, the lever-side link 212 rotates right 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 right 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 locked state of the left and right connecting lock mechanism main bodies 82 is released. In this state, the vehicle-mounted folding cart 10 can be pulled backward from the bed 2 of the vehicle 1.

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

[0071] Furthermore, by the link lock mechanism 50 being in the locked state, as shown in Figs. 7 and 20, 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 the arrow). This causes the wire main body 93w of the detection wire 93 to be pulled 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 is no longer hooked on the hook receiving portion 94 provided at the rear center of the loading platform 2. That is, the vehicle-mounted folding dolly 10 can be separated from the loading platform 2 and used as a dolly.

[0072] <Correspondence between terms used in this embodiment and terms in the present invention> The lower-stage force transmission mechanism 210p of the unlocking operation box 200 of the vehicle-mounted folding cart 10 according to this embodiment corresponds to the force transmission mechanism of the present invention. The rear link mechanism 40 in this embodiment corresponds to the link mechanism of the present invention.

[0073] <Advantages of the vehicle-mounted folding cart 10 according to this embodiment> According to the vehicle-mounted folding dolly 10 of this embodiment, the connection lock release mechanism 210 is configured to release the connection lock state of the connection lock mechanism 80 when the operating handle unit 47 unfolds the rear link mechanism 40. Here, when the operating handle unit 47 unfolds the rear link mechanism 40, the rear wheels 40b (wheels) come into contact with the road surface, and the rear wheels 40b can bear the weight of the dolly body unit 20. In this state, the connection lock release mechanism 210 can release the connection lock state of the connection lock mechanism 80, that is, the connection between the dolly body unit 20 and the loading platform 2 of the vehicle 1. Therefore, when an operator moves the dolly body unit 20 to lower it from the loading platform 2 of the vehicle 1, the weight of the dolly body unit 20 is not applied to the operator.

[0074] <Example of change> Here, the present invention is not limited to the above embodiment, and modifications are possible within the scope of the present invention. For example, in the present embodiment, an example is shown in which the lower-stage side force transmission mechanism 210p of the connection lock release mechanism 210 is mechanically configured from the lever-side link 212, the intermediate link 213, the drive link 214, etc. However, for example, an electrical control unit may be provided instead of the lower-stage side force transmission mechanism 210p, and an electrical signal from the release lever 200r and an electrical signal from the handle pull-out detection mechanism 220 may be input to the control unit, and the connection lock state of the connection lock mechanism 80 may be released by an electrical output signal from the control unit. [Explanation of symbols]

[0075] 1. Vehicle 2. Cargo platform 10. Folding cart for vehicle use 20... Cart body 30...Front link mechanism 30f...Front wheel 40 Rear link mechanism (link mechanism) 40b...Rear wheel (wheel) 47 Operating handle section 49. Handle lock 80... Connection lock mechanism 81. Striker 82... Connection lock mechanism main body 200r Release lever 210p Lower side force transmission mechanism 210 Connection lock release mechanism 220 Handle pull-out detection mechanism

Claims

1. A vehicle-mounted folding cart 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 the cart forward or backward, A cart body on which luggage can be placed; a coupling lock mechanism that couples the dolly body unit and the bed of the vehicle in a state in which the dolly body unit is mounted on the bed of the vehicle; a connection lock release mechanism that releases the connection locked state of the connection lock mechanism; wheels that support the bogie body on a road surface; A link mechanism that connects the wheels to the cart body and is configured to be deployable or foldable; An operating handle portion for operating the link mechanism in an unfolding direction or a folding direction; It has The connection lock release mechanism is configured to release the connection locked state of the connection lock mechanism when the operating handle portion has deployed the link mechanism.

2. The vehicle-mounted folding cart according to claim 1, A front link mechanism that connects a front wheel to a front part of the carriage body and is configured to be unfoldable or foldable; A rear link mechanism that connects the rear wheels to a rear part of the carriage body and is configured to be unfoldable or foldable; It has The operating handle portion is configured to operate the rear link mechanism in a deployment direction by being pulled rearward relative to the carriage body portion, The vehicle-mounted folding cart is configured so that the connection lock release mechanism can release the connection locked state of the connection lock mechanism when the operating handle portion is pulled rearward and the rear link mechanism is deployed.

3. A folding cart for mounting on a vehicle according to claim 1 or 2, The coupling lock mechanism is a folding cart for vehicle installation that includes a coupling lock mechanism main body provided at the rear of the cart main body, and a striker that is provided at the rear end of the vehicle bed and configured to be connectable to the coupling lock mechanism main body.

4. A folding cart for mounting on a vehicle according to claim 2 or 3, The connection lock release mechanism is equipped with a handle pull-out detection mechanism that detects when the operating handle portion is pulled rearward relative to the cart body portion.

5. A folding cart for mounting on a vehicle according to claim 4 which recites claim 3, The connection lock release mechanism includes a release lever that applies an operating force for unlocking to a connection lock mechanism main body of the connection lock mechanism; a force transmission mechanism to which the operating force of the handle withdrawal detection mechanism and the operating force of the release lever are input, The force transmission mechanism transmits the operational force from the release lever to the main body of the connecting lock mechanism when both the operating force from the handle pull-out detection mechanism and the operational force from the release lever are input.

6. A vehicle-mounted folding dolly according to any one of claims 1 to 5, The operating handle portion is provided with a handle lock that holds the operating handle portion in the deployed position or folded position of the link mechanism.

Images