In-vehicle folding trolley

Abstract

To provide a foldable carriage capable of avoiding a concern that a link mechanism is folded by releasing of an expansion lock state of a link lock mechanism by improper operation regardless of whether an auxiliary wheel is loaded on a load carrying platform.SOLUTION: A foldable carriage includes: a carriage body part 22; a wheel; a link mechanism which is a mechanism connecting the wheel with the carriage body part 22 and constituted to be deployable or foldable; a link lock mechanism 50 locking the link mechanism in a deployment state when unloading the carriage body part 22 from the load carrying platform 2; a link lock releasing mechanism 230; an auxiliary wheel 60 supporting the carriage body 22 on the load carrying platform 2; and an auxiliary wheel loading detection mechanism 70 detecting loading of the auxiliary wheel 60 on the load carrying platform 2 when loading the carriage body part 22 on the load carrying platform 2. The link lock releasing mechanism 230 can release the deployment lock state of the link lock mechanism 50 with loading of the auxiliary wheel 60 on the load carrying platform 2 detected.SELECTED DRAWING: Figure 18

Description

Technical Field

[0001] The present invention relates to an in-vehicle folding cart that can be used as a cart and can be mounted on or unloaded from the loading platform of a vehicle by an operator moving it forward or backward.

Background Art

[0002] A conventional in-vehicle folding cart is described in Patent Document 1. As shown in FIG. 26, the in-vehicle folding cart 100 described in Patent Document 1 includes a cart body portion 102 formed of a frame. A standing handle portion 102h is provided at the rear portion of the cart body portion 102, and a horizontal luggage platform 102d is provided on the front side of the handle portion 102h. Further, a front auxiliary wheel 102f is provided on the lower front side of the cart body portion 102. The in-vehicle folding cart 100 includes a front link mechanism 104 that connects the front wheel 103 to the front portion of the cart body portion 102, and a rear link mechanism 106 that connects the rear wheel 105 to the rear portion of the cart body portion 102.

[0003] When mounting the cart body portion 102 of the in-vehicle folding cart 100 on the loading platform 110 of a vehicle, an operator pushes the handle portion 102h of the cart body portion 102 to move the cart body portion 102 forward in the direction of the loading platform 110. As a result, as shown in FIG. 27, the front auxiliary wheel 102f of the cart body portion 102 rides on the loading platform 110 of the vehicle, and the front weight of the cart body portion 102 is received by the front auxiliary wheel 102f. In this state, when the operator further moves the cart body portion 102 forward, the rear end portion of the loading platform 110 of the vehicle relatively presses the front link mechanism 104 and the rear link mechanism 106 of the cart body portion 102 backward. As a result, the front link mechanism 104 and the rear link mechanism 106 of the cart body portion 102 are folded while rotating backward, and the cart body portion 102 is mounted on the loading platform 110 of the vehicle. When unloading the cart body portion 102 of the in-vehicle folding cart 100 from the loading platform 110 of the vehicle, it is performed in the reverse procedure of the above-described procedure.

Prior Art Documents

Patent Documents

[0004] Patent Document 1 Japanese Patent Application Laid-Open No. 2004-299494 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0005] Generally, when mounting the in-vehicle folding cart 100 on the loading platform 110 of a vehicle, the front link mechanism 104 etc. are folded in a state where the deployment lock state of the front link mechanism 104 etc. is released. However, if the deployment lock state of the front link mechanism 104 etc. is accidentally released while the front auxiliary wheel 102f of the cart main body 102 has not climbed onto the loading platform 110 of the vehicle, the front link mechanism 104 etc. will not be able to support the weight of the luggage on the luggage platform 102d of the cart main body 102.

[0006] The present invention has been made to solve the above problems, and the problem to be solved by the present invention is to prevent a malfunction in which the deployment lock state of the link lock mechanism is released due to an incorrect operation and the link mechanism is folded, even though the auxiliary wheel is not mounted on the loading platform of the vehicle. MEANS FOR SOLVING THE PROBLEMS

[0007] The above problems are solved by each invention. The first invention is an in-vehicle folding cart that can be used as a cart and can be mounted on or unloaded from the loading platform of a vehicle by an operator moving forward or backward, and includes a cart main body on which luggage can be placed, wheels that support the cart main body on the road surface, a mechanism that connects the wheels to the cart main body, a link mechanism configured to be deployable or foldable, a link lock mechanism that locks the link mechanism in a deployed state when the cart main body is unloaded from the loading platform of the vehicle, a link lock release mechanism that releases the deployment lock state of the link lock mechanism, an auxiliary wheel that supports the cart main body on the loading platform of the vehicle, and an auxiliary wheel mounting detection mechanism that detects that the auxiliary wheel has climbed onto the loading platform of the vehicle when the cart main body is mounted on the loading platform of the vehicle. At the same time, as the link mechanism, it is a mechanism for connecting the front wheels to the cart main body, and has a front link mechanism configured to be deployable or foldable. The link unlocking mechanism is configured to be able to release the deployment lock state of the link locking mechanism in a state where the mounting of the auxiliary wheel on the loading platform is detected by the auxiliary wheel mounting detection mechanism.

[0008] According to the present invention, the link unlocking mechanism is configured to be able to release the deployment lock state of the link locking mechanism in a state where the mounting of the auxiliary wheel on the loading platform is detected by the auxiliary wheel mounting detection mechanism. Therefore, in a state where the auxiliary wheel of the cart main body is not mounted on the vehicle loading platform, the deployment lock state of the link locking mechanism cannot be released, and the link mechanism is held in the deployed state. Thus, even though the auxiliary wheel is not mounted on the vehicle loading platform, a problem does not occur in which the deployment lock state of the link locking mechanism is released due to an incorrect operation and the link mechanism is folded. According to the first invention, the link lock mechanism is held in a deployed locked state by an elastic force when the link mechanism and the front link mechanism move from the folded position to the deployed position. That is, when the front link mechanism or the like lowers the cart main body from the vehicle loading platform, it automatically deploys and is held in a locked state. According to the first invention, the link lock mechanism includes a lock claw provided on the cart main body and held at the lock position by an elastic force, and a lock piece provided on the link mechanism or the front link mechanism and engaged with the lock claw at the deployed position. According to the first invention, the link unlocking mechanism includes a release lever capable of applying an operating force for unlocking to the lock claw of the link lock mechanism, and a force transmission mechanism into which the operating force of the auxiliary wheel mounting detection mechanism and the operating force of the release lever are input. The force transmission mechanism transmits the operating force of the release lever to the lock claw of the link lock mechanism in a state where both the operating force of the auxiliary wheel mounting detection mechanism and the operating force of the release lever are input. That is, due to the function of the force transmission mechanism, the link unlocking mechanism can release the deployed locked state of the front link mechanism or the like in a state where it is detected that the auxiliary wheel has been placed on the vehicle loading platform.

[0009] According to a second invention, As the link mechanism, a rear link mechanism that is a mechanism for connecting the rear wheels to the cart main body and is configured to be deployable or foldable while having and has a front auxiliary wheel that supports the front part of the cart main body on the loading platform of the vehicle. The link locking mechanism is a mechanism for locking the front link mechanism in the deployed state, and the auxiliary wheel mounting detection mechanism is a mechanism for detecting that the front auxiliary wheel has mounted on the vehicle loading platform.

[0013] The 3The invention relates to a vehicle-mounted folding trolley that can be mounted on or unloaded from the vehicle's loading platform by an operator moving forward or backward. It includes a trolley body on which goods can be placed, wheels that support the trolley body on the road surface, a mechanism that connects the wheels to the trolley body, a link mechanism configured to be deployable or foldable, a link lock mechanism that locks the link mechanism in the deployed state when unloading the trolley body from the vehicle's loading platform, a lock detection mechanism that detects the locked state of the link lock mechanism, and a fall prevention mechanism configured to be hung on the vehicle's loading platform when unloading the trolley body from the vehicle's loading platform. When unloading the trolley body from the vehicle's loading platform, if the lock detection mechanism does not detect the locked state of the link lock mechanism, the fall prevention mechanism is hung on the vehicle's loading platform.

[0014] No. 3 According to the invention of No.

[0015] No. 4 According to the invention of No.

Advantages of the Invention

[0016] According to the present invention, even though the auxiliary wheel is not mounted on the loading platform of the vehicle, there is no problem that the locking state of the link lock mechanism is released due to an accidental operation and the link mechanism is folded.

Brief Description of the Drawings

[0017]

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Figure 27

[0018] [Embodiment 1] Hereinafter, based on FIGS. 1 to 25, an in-vehicle folding cart according to Embodiment 1 of the present invention will be described. The in-vehicle folding cart 10 according to the present embodiment is a cart configured to be usable alone as a cart and to be mounted on a vehicle 1 provided with a dedicated loading platform 2 with a load placed thereon. Here, the front, rear, left, right, and up and down shown in the drawings correspond to the front, rear, left, right, and up and down of the vehicle 1 and the in-vehicle folding cart 10.

[0019] <Regarding the outline of the in-vehicle folding cart 10> As shown in FIG. 1, the in-vehicle folding cart 10 is a handcart and includes a cart main body 20 including a loading deck frame 22 and the like. The loading deck frame 22 is a portion for placing a load and includes a substantially rectangular edge frame (omitted in the figure number) and an intermediate frame (omitted in the figure number) spanned at a certain interval between the left and right sides of the edge frame. A hand push handle 23 is fixed in an upright state at the rear end position of the loading deck frame 22. In the drawings after FIG. 3, the hand push handle 23 is omitted.

[0020] As shown in FIGS. 3, 4, etc., the cart main body 20 includes a skeleton frame 21 that supports the loading deck frame 22 from below. The skeleton frame 21 is composed of 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 (omitted in the figure number) extending in the front-rear direction and a vertical frame portion (omitted in the figure number) extending downward at the rear end position of the horizontal frame portion. And the horizontal frame portion of the inverted L-shaped frame 21y supports the loading deck frame 22. Further, a link rail 31 (described later) extending in the front-rear direction of the cart main body 20 is attached to the outer surface of the horizontal frame portion of the inverted L-shaped frame 21y.

[0021] On the left and right sides of the front part of the cart body 20 of the in-vehicle folding cart 10, as shown in FIGS. 3 to 5 and the like, the front wheels 30f are connected by a pair of left and right front link mechanisms 30. And, as shown in FIG. 1, the left and right front link mechanisms 30 are connected by a connecting bar 30r. Further, on the left and right sides of the rear part of the cart body 20, the rear wheels 40b are connected by a rear link mechanism 40.

[0022] <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 frame frame 21 of the cart body 20 so as to be rotatable up and down, and a support arm 33 connected to an intermediate position of the front arm 32 so as to be rotatable up and down. And the front wheel 30f is attached to the rotatable free end side (lower end) of the front arm 32. A slide portion 34 is connected to the rotatable free end side (upper end) of the support arm 33 so as to be rotatable up and down. And the slide portion 34 is configured to be slidable back and forth along a link rail 31 extending in the front-rear direction. For this reason, when the front arm 32 rotates counterclockwise (rotates rearward) with respect to the frame frame 21 of the cart body 20 in FIG. 6 and the slide portion 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 frame frame 21. That is, the front link mechanism 30 is stored in the storage position below the frame frame 21.

[0023] Also, when the front arm 32 rotates clockwise (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 in the deployed state (deployed position) as shown in FIG. 6. Here, the front link mechanism 30 includes a spring member (not shown) biased in the direction of rotating the front arm 32 clockwise (deploying). Further, below the frame frame 21 (horizontal frame portion) of the cart body 20, as shown in FIGS. 6 and 7, a link lock mechanism 50 (described later) for holding the front link mechanism 30 in the deployed state is provided.

[0024] <Regarding the rear link mechanism 40> As shown in FIG. 5, the rear link mechanism 40 includes a pair of left and right lower rear arms 43 to which rear wheels 40b are connected at their lower end positions, an intermediate link 44 that connects intermediate positions of the left and right lower rear arms 43 as shown in FIG. 3, and a V-shaped link 45 that is connected to the central portion of the intermediate link 44. As shown in FIG. 5, the pair of left and right lower rear arms 43 are connected at their upper end portions C (pivoting centers C) to the vertical frame portions of the inverted L-shaped frame 21y of the carriage body 20 in a state where they can pivot vertically. As shown in FIG. 3, the intermediate link 44 is configured to connect the left and right lower rear arms 43 by a horizontal shaft portion 44j, and a bracket portion 44b that protrudes radially outward is provided at the central portion in the length direction of the shaft portion 44j.

[0025] As shown in FIGS. 3 and 8, the V-shaped link 45 is bent in a V shape so as to protrude rearward, and the lower end portion of the V-shaped link 45 is connected to the bracket portion 44b of the intermediate link 44 in a state where it can pivot vertically. And as shown in FIG. 8, the upper end portion of the V-shaped link 45 is connected to a handle bracket portion 47b provided at the central portion of the front end of the operation handle portion 47 in a state where it can pivot vertically. The operation handle portion 47 is a handle for deploying or folding the rear link mechanism 40, and is horizontally provided so as to protrude rearward below the central portion of the rear end of the loading deck frame 22 as shown in FIGS. 3, 4, etc.

[0026] As shown in Fig. 4 and the like, the operation handle portion 47 is formed in a substantially rectangular shape from a U-shaped frame and two pipes (not shown in the figure number) connecting the front end portions of the U-shaped frame. And, at an intermediate position of the two pipes of the operation handle portion 47, as shown in Fig. 4, Fig. 8 and the like, a handle bracket portion 47b to which the upper end portion of the V-shaped link 45 is connected is formed to protrude downward. The operation handle portion 47 is supported from both left and right sides in a state where it can slide back and forth by a handle rail 48 (see Fig. 3 and Fig. 4) attached to the inner surface of the reverse L-shaped frame 21y (horizontal frame portion) of the cart body portion 20. That is, when the operation handle portion 47 is pulled backward, the operation handle portion 47 slides backward along the handle rail 48. Also, when the operation handle portion 47 is pushed forward, the operation handle portion 47 slides forward along the handle rail 48.

[0027] When the operation handle portion 47 is pulled backward, as shown in Fig. 8, the upper end portion of the V-shaped link 45 is pulled backward via the handle bracket portion 47b. As a result, the lower end portion of the V-shaped link 45 moves 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 (counterclockwise rotation in Fig. 8) about the rotation center C with respect to the skeleton frame 21 of the cart body portion 20, and the rear link mechanism 40 is deployed (deployed position). Also, when the operation handle portion 47 is pushed forward, as shown in Fig. 9 and Fig. 10, the upper end portion of the V-shaped link 45 is pulled forward via the handle bracket portion 47b. As a result, the lower end portion of the V-shaped link 45 moves 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 (clockwise rotation in the figure) with respect to the skeleton frame 21 of the cart body portion 20, and the rear link mechanism 40 is folded (see Fig. 10). In a state where the rear link mechanism 40 is folded, the rear wheels 40b are retracted and stored under the loading platform 2 of the vehicle 1 (stored position). On the left side of the operation handle portion 47, as shown in Figs. 8 to 10, a handle lock 49 for holding the operation handle portion 47 at the pushed-in front end position or the pulled-out rear end position is provided.

[0028] <Regarding the front auxiliary wheels 60 and rear auxiliary wheels 67> In the in-vehicle folding cart 10, as shown in FIGS. 1 and 3 etc., with the pair of left and right front link mechanisms 30 and rear link mechanisms 40 held in the deployed position, the left and right front wheels 30f and the left and right rear wheels 40b receive the weight of the cart main body 20 on the road surface. Further, in the in-vehicle folding cart 10, with the left and right front link mechanisms 30 and rear link mechanisms 40 folded and stored, there are provided 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 receive the weight of the cart main body 20 on the loading platform 2 of the vehicle 1.

[0029] As shown in FIG. 5 etc., the front auxiliary wheel 60 is supported by a front movable bracket 62, 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 cart main body 20 in a state where it can rotate up and down. The left and right front auxiliary wheels 60 are configured to receive the weight of the cart 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, they are arranged inside the vehicle width direction with respect to the left and right front wheels 30f. The left and right rear auxiliary wheels 67 are fixed to the lower side of the rear part of the horizontal frame portion of the inverted L-shaped frame 21y of the cart main body 20 via a rear fixed bracket 67b as shown in FIG. 5 etc. The left and right rear auxiliary wheels 67 are configured to be able to receive the weight of the cart main body 20 at a height position approximately equal to that of the left and right front auxiliary wheels 60. And as shown in FIG. 4, the left and right rear auxiliary wheels 67 are arranged inside the vehicle width direction with respect to the left and right rear wheels 40b.

[0030] <Regarding 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 lock 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 tube-shaped guide portion 52 fixed to the skeleton frame 21 (connecting frame 21r) of the cart main body portion 20, and a lock claw 53 housed in the guide portion 52. Further, 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 along the vehicle width direction. The lock claw 53 is housed in the guide portion 52 in a substantially prismatic shape and displaceable in the vehicle width direction, and the tip portion thereof is configured to be able to project outward in the vehicle width direction from the guide portion 52 by a spring force by a certain dimension. The tip portion of the lock claw 53 has a rear surface formed in a planar circular arc shape, and a flat stopper surface 53r on the front surface side.

[0031] In the process of the front link mechanism 30 being deployed, when the slide portion 34 of the support arm 33 slides forward along the link rail 31, the lock piece 34r of the slide portion 34 abuts against the planar circular arc-shaped rear surface of the lock claw 53, and the lock claw 53 is pushed inward in the vehicle width direction against the spring force. Then, when the lock piece 34r of the slide portion 34 gets over the lock claw 53 and reaches the front side of the lock claw 53, as shown in FIG. 7, the lock claw 53 projects outward in the vehicle width direction from the guide portion 52 by a certain dimension by the spring force. 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 are engaged, the front link mechanism 30 is deployed, and the link lock mechanism 50 is held in the deployed lock state.

[0032] <Regarding the connection lock mechanism 80> The in-vehicle folding cart 10 is provided with a connection lock mechanism 80 that connects the in-vehicle folding cart 10 to the loading platform 2 of the vehicle 1 when the in-vehicle folding cart 10 is mounted on the loading platform 2 of the vehicle 1. As shown in FIGS. 3 to 5 and the like, the connection lock mechanism 80 includes a connection lock mechanism main body 82 fixed to the central portion in the height direction of the vertical frame portion of the left and right inverted L-shaped frames 21y of the cart main body 20, and left and right strikers 81 provided at the rear end of the loading platform 2 of the vehicle 1 (see FIG. 2). The connection lock mechanism main body 82 has the same basic structure as the door lock of an automobile. When the horizontal bar-shaped striker 81 enters the recess of the connection lock mechanism main body 82 from the front, the striker 81 and the hook (not shown) of the connection lock mechanism main body 82 are engaged by a spring force. Thereby, the in-vehicle folding cart 10 mounted on the loading platform 2 of the vehicle 1 is connected to the loading platform 2.

[0033] <Overview of the connection lock release mechanism 210 and the link lock release mechanism 230> The in-vehicle folding cart 10 includes a connection lock release mechanism 210 (described later) for releasing the connection lock state of the connection lock mechanism 80, and a link lock release mechanism 230 (described later) for releasing the deployed 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 provided with force transmission mechanisms 210p and 230p (described later) that transmit the lock release operation force to the connection lock mechanism 80 and the link lock mechanism 50, respectively. And, 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 the lock release operation box 200. As shown in FIGS. 3 and 4 and the like, the lock release operation box 200 is attached to the skeleton frame 21 of the cart main body 20 at a position inside the width direction of the operation handle portion 47.

[0034] <Overview of the fall prevention mechanism 90> In the in-vehicle folding trolley 10, when the in-vehicle folding trolley 10 is lowered from the loading platform 2 of the vehicle 1, in the case where the deployment of the front link mechanism 30 is insufficient, a fall prevention mechanism 90 for hanging the front part of the trolley main body 20 on the rear part of the loading platform 2 of the vehicle 1 is provided. As shown in FIG. 3, the fall prevention mechanism 90 includes a fall prevention hook 92 provided at the center of the front part of the trolley main body 20, a hook receiving part 94 provided at the center of the rear part of the loading platform 2 of the vehicle 1 (see FIGS. 1 and 2), and a lock detection mechanism 96 (see FIGS. 3 and 4) for detecting the locked state of the link lock mechanism 50.

[0035] <Regarding the loading platform 2 of the vehicle 1> As shown in FIGS. 1 and 2, the loading platform 2 of the vehicle 1 is formed in a substantially rectangular shape in plan view. On both the left and right sides of the loading platform 2, strip-shaped block portions 2b formed to be higher than the loading platform surface by a certain dimension are formed so as to extend in the vehicle front-rear direction. The block portion 2b is a portion on which a boarding guide portion 32g provided on the front arm 32 of the front link mechanism 30 of the in-vehicle folding trolley 10 is placed, and the rear end portion of the block portion 2b is a wedge-shaped inclined surface 2k. On the inner side in the vehicle width direction of the inclined surfaces 2k of the left and right block portions 2b, strikers 81 of the connection lock mechanism 80 are provided so as to extend in the left-right direction. Further, on the inner side in the vehicle width direction of the left and right strikers 81, inclined surface-shaped rear auxiliary wheel guide portions 2h for guiding the left and right rear auxiliary wheels 67 of the in-vehicle folding trolley 10 onto the loading platform surface of the loading platform 2 are provided. Furthermore, on the inner side in the vehicle width direction of the left and right rear auxiliary wheel guide portions 2h, inclined surface-shaped front auxiliary wheel guide portions 2f for guiding the left and right front auxiliary wheels 60 of the in-vehicle folding trolley 10 onto the loading platform surface of the loading platform 2 are provided. And on the inner side in the vehicle width direction (center side) of the right front auxiliary wheel guide portion 2f, the hook receiving part 94 of the above-described fall prevention mechanism 90 is provided.

[0036] <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 in-vehicle folding cart 10 and the loading platform 2 of the vehicle 1 when lowering the in-vehicle folding cart 10 from the loading platform 2 of the vehicle 1. When lowering the in-vehicle folding cart 10 from the loading platform 2 of the vehicle 1, as shown in FIG. 8, the connection lock release mechanism 210 is configured to be able to release the connection lock state of the connection lock mechanism 80 in a state where the operation handle portion 47 is pulled backward and the rear link mechanism 40 is deployed. As shown in the overall configuration diagram of FIG. 11, the connection lock release mechanism 210 includes a release lever 200r for performing a lock release operation, a lower side force transmission mechanism 210p provided at the lower stage of the lock release 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 operation handle portion 47 has been pulled backward with respect to the cart main body portion 20.

[0037] Here, the lock release operation box 200 is provided with a switching lever 200y for switching between the case of mounting the in-vehicle folding cart 10 on the loading platform 2 of the vehicle 1 and the case of lowering it from the loading platform 2. The switching lever 200y and the release lever 200r are shared 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 the left rotation limit position shown in FIG. 11 and the right rotation limit position shown in FIG. 18. The switching lever 200y is held at the left rotation limit position (lowering position) (see FIG. 11 etc.) when lowering the in-vehicle folding cart 10 from the loading platform 2 of the vehicle 1. Also, when mounting the in-vehicle folding cart 10 on the loading platform 2 of the vehicle 1, it is held at the right rotation limit position (mounting position) (see FIG. 18 etc.).

[0038] As shown in Fig. 11, the lower 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 rotatable free 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. Further, a rectangular convex portion 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.

[0039] As shown in Fig. 11, the intermediate link 213 is overlapped with the lower side of the lever side link 212 in a state where it can be horizontally rotated about the rotation center axis J1. A linear slit portion 213h is formed in a protruding portion at one end side (right end side) of the intermediate link 213, and a protruding projection 213x (described later) is formed at the tip portion of the other end side (left end side). The force transmission pin 201 described above is mounted so as to be movable along the linear slit portion 213h at the position of the linear slit portion 213h of the intermediate link 213. Here, an arc hole (not shown in the figure number) is formed in the switching lever 200y at a position on the side opposite to the lever operation portion with the rotation center axis J0 interposed therebetween. The arc hole is formed so that its center coincides with the rotation center axis J1 in a state where the switching lever 200y is at the left rotation limit position (lowering position). The force transmission pin 201 of the intermediate link 213 engages with the arc hole so as to be movable along the arc hole of the switching lever 200y.

[0040] Here, when the switching lever 200y is in the left rotation limit position (lowering position), as shown in FIG. 11, the force transmission pin 201 of the intermediate link 213 has moved to the radially inner end of the slit portion 213h by the action of the switching lever 200y. Thereby, the force transmission pin 201 of the intermediate link 213 and the angular 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 about the rotation center axis J1, the angular 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 center axis J1. Therefore, when the lever-side link 212 rotates clockwise about the rotation center axis J1, the intermediate link 213 can be pushed by the force transmission pin 201 and rotate clockwise about the rotation center axis J1.

[0041] However, when the switching lever 200y rotates clockwise from the left rotation limit position (lowering position), the force transmission pin 201 of the intermediate link 213 moves radially outward along the slit portion 213h by the action of the switching lever 200y. Thereby, the engagement between the angular convex portion 212t of the lever-side link 212 and the force transmission pin 201 of the intermediate link 213 is released. As a result, even when the release lever 200r is pulled rearward and the lever-side link 212 rotates clockwise about the rotation center axis J1, the lever-side link 212 only rotates clockwise alone, and the intermediate link 213 is held at the current position by the spring force.

[0042] Below the intermediate link 213, as shown in FIG. 11, the drive link 214 is overlapped in a state where it can rotate horizontally about 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 link lock mechanism main body 82 of the link lock mechanism 80. The drive link 214 is formed in a substantially L-shaped strip plate shape, and one end side is connected to the rotation center axis J1. And one end of the wire main body 217w of the unlocking wire 217 is connected to the other end side (rotation free end side) of the drive link 214. As shown in FIG. 11, the wire main body 217w of the unlocking wire 217 is connected to the drive link 214 with one end side wound around the pulley 217p, and the other end side is branched left and right via the branch portion 217z and connected to the left and right link lock mechanism main bodies 82.

[0043] In the vicinity of the rotation free end side of the drive link 214, a slit portion 214h extending in the length direction of the drive link 214 is formed. And a force transmission pin 215p is attached to the slit portion 214h of the drive link 214 so as to be movable along the slit portion 214h. Here, at the end portion on the rotation center side in the slit portion 214h of the drive link 214, as shown in FIG. 11, the protruding projection 213x on the left end side of the intermediate link 213 is arranged along the slit portion 214h.

[0044] As shown in FIG. 11, the steering wheel position interlocking link 215 is a substantially strip-shaped link. The central portion in the length direction is connected to the rotation center axis J2 and is configured to be horizontally rotatable about the rotation center axis J2. An arc-shaped hole (see FIG. 15, drawing number omitted) is formed at one end side of the steering wheel position interlocking link 215, and the force transmission pin 215p of the drive link 214 is engaged with the arc-shaped hole. Here, as shown in FIG. 15, the arc-shaped hole is formed so that the center coincides with the rotation center axis J1 in a state where the steering wheel position interlocking link 215 is at the right rotation limit position. Further, as shown in FIG. 11 and the like, one end side of the wire body portion 218w of the position detection wire 218 is connected to the other end side of the steering wheel position interlocking link 215. The other end side of the position detection wire 218 is connected to the steering wheel pull-out detection mechanism 220.

[0045] As described above, the steering wheel pull-out detection mechanism 220 is a mechanism that detects that the operation handle portion 47 of the cart main body portion 20 has been pulled backward. As shown in FIGS. 3 and 11 and the like, it is provided between the right side of the operation handle portion 47 and the right handle rail 48. As shown in FIGS. 11, 13, and 14, the steering wheel pull-out detection mechanism 220 includes a detection bracket 222 fixed to the front right side of the operation handle portion 47, and a detection sensor portion 224 attached to the lower side of the loading deck frame 22 via a front and rear slide portion 224b (see FIGS. 13 and 14). And the other end side of the wire body portion 218w of the position detection wire 218 is connected to the detection sensor portion 224. Further, as shown in FIG. 13 and the like, the tube portion of the other end side of the position detection wire 218 is fixed to the lower side of the loading deck frame 22 by a wire bracket 218b.

[0046] When the operation handle part 47 is pushed forward, as shown in FIGS. 11 to 13, the pressing part 222s of the detection bracket 222 and the pressing receiving part 224u of the detection sensor part 224 are separated in the front-rear direction. However, when the operation handle part 47 is pulled backward, as shown in FIGS. 15 to 17, the pressing part 222s of the detection bracket 222 presses the pressing receiving part 224u of the detection sensor part 224 backward, 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 backward by the detection sensor part 224.

[0047] When the wire main body part 218w is pulled, as shown in FIG. 15, the handle position interlocking link 215 rotates clockwise to the clockwise rotation limit position about the rotation center axis J2. As a result, the force transmission pin 215p of the drive link 214 moves along the slit part 214h to the end on the rotation center side of the slit part 214h by 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 projection 213x of the intermediate link 213 engage in the rotation direction.

[0048] <Regarding the operation of the connection lock release mechanism 210> When the switching lever 200y is held at the counterclockwise rotation limit position (lowering position) as shown in FIG. 11, the lever side link 212 of the lower side force transmission mechanism 210p and the intermediate link 213 engage in the rotation direction via the force transmission pin 201 and the like. In this state, when the operation 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 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 clockwise about the rotation center axis J2.

[0049] As a result, the force transmission pin 215p of the drive link 214 moves along the slit portion 214h to the end on the rotation center side of the slit portion 214h. Thereby, the force transmission pin 215p of the drive link 214 and the protruding projection 213x of the intermediate link 213 engage with each other in the rotation direction. Here, when the operation handle portion 47 is pulled backward, as described above, the rear link mechanism 40 is held in the deployed state.

[0050] Next, as shown in FIG. 17, when the release lever 200r is pulled backward, 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, and the drive link 214 rotates clockwise about the rotation center axis J1. As a result, the wire main body portion 217w of the lock release wire 217 is pulled by the drive link 214, and the linked lock state of the left and right linked lock mechanism main body portions 82 is released. Here, when the operation handle portion 47 is not pulled backward, as shown in FIG. 12, since the force transmission pin 215p of the drive link 214 and the protruding projection 213x of the intermediate link 213 are not engaged with each other in the rotation direction, even if the release lever 200r is pulled backward, the operating force thereof is not transmitted to the left and right linked lock mechanism main body portions 82.

[0051] <Regarding the link lock release mechanism 230> The link lock release mechanism 230 is a mechanism for releasing the deployed lock state of the link lock mechanism 50 of the front link mechanism 30 when the in-vehicle folding dolly 10 is mounted on the loading platform 2 of the vehicle 1. The link lock release mechanism 230 is configured to be able to release the deployed lock state of the link lock mechanism 50 when the left and right front auxiliary wheels 60 of the in-vehicle folding dolly 10 are on the loading platform 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 for performing a lock release operation, an upper side force transmission mechanism 230p provided on the upper stage of the lock release operation box 200, and an auxiliary wheel mounting detection mechanism 70.

[0052] As shown in Fig. 18, the upper-side 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-side force transmission mechanism 230p is basically the same as that of the lower-side 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 rotation free 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. Also, a rectangular convex portion (not shown) engageable with the force transmission pin 202 of the intermediate link 233 is formed at an intermediate position of the lever-side link 232.

[0053] As shown in Fig. 18, the intermediate link 233 is provided so as to be horizontally rotatable about the rotation center axis J1, and the above-described force transmission pin 202 is mounted at the position of the slit portion 233h of the intermediate link 233. Then, in a state where the switching lever 200y is at the right rotation limit position (mounting position), as shown in Fig. 18, due to the action of the switching lever 200y, the rectangular 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. The drive link 234 is a link that transmits the unlocking operation force of the release lever 200r to the locking claw 53 of the link locking mechanism 50, and is configured to be horizontally rotatable about the rotation center axis J1. One end side of the drive link 234 is connected to the rotation center axis J1, and one end side of the wire body portion 237w of the unlocking wire 237 is connected to the other end side (rotation free end side). As shown in Fig. 18, the wire body portion 237w of the unlocking wire 237 branches left and right via a branch portion 237z at the other end side and is connected to the locking claws 53 of the left and right link locking mechanisms 50.

[0054] A slit portion 234h is formed near the rotatable free end side of the drive link 234, and a force transmission pin 235p is attached at the position of the slit portion 234h. Further, at the end portion on the rotation center side in the slit portion 234h of the drive link 234, an overhanging protrusion (not shown) at 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 about the rotation center axis J3. An arc hole (not shown in the figure number) is formed at one end side of the auxiliary wheel position interlocking link 235, and the force transmission pin 235p of the drive link 234 is engaged so as to be movable along the arc hole. As shown in FIGS. 18 and 19, the arc hole is formed such that the center thereof coincides with the rotation center axis J1 in a state where the auxiliary wheel position interlocking link 235 is at the left rotation limit position. At the other end side of the auxiliary wheel position interlocking link 235, as shown in FIG. 18 and the like, one end of the wire body portion 74w of the position detection wire 74 of the auxiliary wheel mounting detection mechanism 70 is connected.

[0055] The auxiliary wheel mounting detection mechanism 70 is a mechanism for detecting that the left and right front auxiliary wheels 60 of the in-vehicle folding cart 10 have mounted on the loading platform 2 of the vehicle 1. Here, as shown in FIG. 18, the left and right front auxiliary wheels 60 are supported by the front movable brackets 62. The front movable brackets 62 are connected to the front end portion of the skeleton frame 21 of the cart main body portion 20 in a state where they can rotate up and down, and the front auxiliary wheels 60 are attached to the front surface of the rotatable free end side of the front movable brackets 62 as shown by the two-dot chain line in FIG. 18. Then, when the in-vehicle 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 in-vehicle folding cart 10 being pushed forward, it rides up onto the loading platform surface from the inclined front auxiliary wheel guide portion 2f. As a result, the front movable brackets 62 rotate upward beyond the rotation upper limit position as the front auxiliary wheels 60 rise.

[0056] As shown in Fig. 18, the auxiliary wheel mounting detection mechanism 70 includes an auxiliary wheel interlocking bracket portion 72 configured to be integrally rotatable up and down with the front movable bracket 62. And the other end side of the wire body portion 74w of the position detection wire 74 is connected to the upper part of the tip of the auxiliary wheel interlocking bracket portion 72. Further, a wire bracket 73 for supporting the tube portion on the other end side of the position detection wire 74 is attached to the front end portion of the skeleton frame 21 of the carriage main body portion 20. Thus, when the front auxiliary wheel 60 rides on the loading surface of the loading platform 2 through the front auxiliary wheel guide portion 2f of the loading platform 2, the auxiliary wheel interlocking bracket portion 72 rotates counterclockwise (rotates upward) in Fig. 18 together with the front movable bracket 62, and the wire body portion 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 counterclockwise about the rotation center axis J3. Thereby, the drive link 234 and the intermediate link 233 are engaged in the rotation direction via a force transmission pin 235p or the like.

[0057] <Regarding the operation of the link lock release mechanism 230> As shown in Fig. 18, when the switching lever 200y is held at the right rotation limit position (mounting position), the lever side link 232 and the intermediate link 233 are engaged in the rotation direction via a force transmission pin 202 or the like. In this state, when the front auxiliary wheel 60 is placed on the loading surface of the loading platform 2 through the front auxiliary wheel guide portion 2f of the loading platform 2, the wire body portion 74w of the position detection wire 74 is pulled, so that the auxiliary wheel position interlocking link 235 rotates counterclockwise about the rotation center axis J3. Thereby, the drive link 234 and the intermediate link 233 are engaged in the rotation direction via a force transmission pin 235p or the like.

[0058] In this state, when the release lever 200r is pulled backward, as shown in FIG. 19, the lever-side link 232 rotates counterclockwise about the rotation center 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 counterclockwise about the rotation center axis J1. As a result, the wire body portion 237w of the lock release 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 portion 34 is released (the deployment lock state is released). When the front auxiliary wheel 60 cannot be mounted on the loading platform 2, since the drive link 234 and the intermediate link 233 do not engage in the rotation direction, even if the release lever 200r is pulled backward, the operating force is not transmitted to the left and right link lock mechanisms 50.

[0059] <Regarding the fall prevention mechanism 90> The fall prevention mechanism 90 is a mechanism that hooks the front part of the trolley main body 20 to the rear part of the loading platform 2 of the vehicle 1 when the in-vehicle folding trolley 10 is lowered from the loading platform 2 of the vehicle 1 and the deployment of the front link mechanism 30 is insufficient. As shown in FIG. 20, the fall prevention mechanism 90 includes a fall prevention hook 92 provided at the center of the front part of the trolley main body 20, a hook receiving portion 94 provided at the center of the rear part of the loading platform 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 part of the skeleton frame 21 of the trolley main body 20 in a state where it can rotate up and down. A hook-shaped hook body portion 92m is formed at the lower end portion of the fall prevention hook 92. One end of the wire body portion 93w of the detection wire 93 in the lock detection mechanism 96 is connected to the center portion of the fall prevention hook 92 in the height direction.

[0060] As described above, the lock detection mechanism 96 is a mechanism that detects the locked state of the link lock mechanism 50. When the link lock mechanism 50 is not in the locked state, the fall prevention hook 92 is operated with the deployment of the front link mechanism 30 being insufficient. As shown in the perspective views of FIGS. 3 and 7, the lock detection mechanism 96 is installed near the link lock mechanism 50 on the right side of the carriage. 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 lower side of the loading deck frame 22 via a front and rear slide portion 96b. And the other end side of the wire body portion 93w of the detection wire 93 is connected to the detection receiving portion 96m. Further, the tube portion on the other end side of the detection wire 93 is fixed to the lower side of the loading deck frame 22 by a wire bracket 93x.

[0061] In the process of the front link mechanism 30 unfolding from the folded storage state, the slide portion 34 of the support arm 33 of the front link mechanism 30 is located rearward with respect to 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. However, when the slide portion 34 of the support arm 33 moves forward along the link rail 31 to the deployment position of the front link mechanism 30 (the link lock mechanism 50 is in the deployed 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 body portion 93w of the detection wire 93 is pulled forward, and the fall prevention hook 92 is pulled upward by the wire body portion 93w hung on the pulley 21p.

[0062] In this state, the hook body portion 92m of the fall prevention hook 92 provided at the center of the front portion of the cart body 20 fails to engage with the hook receiving portion 94 provided at the center of the rear portion of the loading platform 2. Further, when the slide portion 34 of the support arm 33 has not advanced to the deployment position of the front link mechanism 30, the detection piece 34s of the slide portion 34 of the support arm 33 does not press the receiving surface 96u of the detection receiving portion 96m forward, resulting in insufficient lifting of the fall prevention hook 92. As a result, the hook body portion 92m of the fall prevention hook 92 provided at the center of the front portion of the cart body 20 engages with the hook receiving portion 94 provided at the center of the rear portion of the loading platform 2, and the center of the front portion of the cart body 20 is hooked on the hook receiving portion 94 of the loading platform 2.

[0063] <Regarding the operation of the in-vehicle folding cart 10> When the in-vehicle folding cart 10 is used as a cart (with a load placed thereon), as shown in FIG. 22, the front link mechanism 30 and the rear link mechanism 40 are in a deployed state, and the link lock mechanism 50 of the front link mechanism 30 is held in a deployed and locked state. Also, the operation handle portion 47 is pulled out rearward, and the operation handle portion 47 is held at the rear end position of the pull-out by the handle lock 49. As a result, the rear link mechanism 40 is locked in a deployed state. When mounting the in-vehicle folding cart 10 on the loading platform 2 of the vehicle 1 from this state, first, the switching lever 200y is horizontally rotated to the mounting position side as shown in FIG. 18. Thereby, the lever side link 232 and the intermediate link 233 in the upper stage side force transmission mechanism 230p in the lock release operation box 200 engage in the rotation direction via the force transmission pin 202 and the like.

[0064] In this state, the in-vehicle folding hand truck 10 is advanced, and as shown in FIG. 22, the left and right front auxiliary wheels 60 of the in-vehicle folding hand truck 10 are brought into contact with the left and right front auxiliary wheel guide portions 2f of the loading platform 2, and are 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 link bracket portion 72 of the auxiliary wheel mounting detection mechanism 70 rotates upward (rotates counterclockwise in FIG. 18) together with the front movable bracket 62 of the front auxiliary wheel 60, pulls the wire body portion 74w of the position detection wire 74, and rotates the auxiliary wheel position interlocking link 235 counterclockwise. As a result, the intermediate link 233 and the drive link 234 are engaged in the rotation direction via a power transmission pin 235p or the like.

[0065] In this state, when the release lever 200r is pulled backward, as shown in FIG. 19, the lever side link 232 rotates counterclockwise about the rotation center axis J1, 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 counterclockwise about the rotation center axis J1. As a result, the wire body portion 237w of the lock release 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 deployment lock state is released.

[0066] In this state, when the in-vehicle 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 relatively pushed backward by the rear end portion of the loading platform 2, and the left and right front arms 32 rotate backward (rotate counterclockwise in Fig. 23) against the spring force. Also, the slide portions 34 of the support arms 33 of the front link mechanism 30 slide backward along the link rails 31. As a result, the front link mechanism 30 is folded below the skeleton frame 21 of the dolly main body portion 20. Further, during the process of folding the front link mechanism 30, as shown in Fig. 24, the mounting guide portions 32g of the left and right front arms 32 ride on the block portions 2b of the loading platform 2 of the vehicle 1, and the left and right front arms 32 further rotate upward and are held in the storage position. Then, after the mounting guide portions 32g of the front arms 32 ride on the block portions 2b of the loading platform 2, as shown in Fig. 25, the left and right auxiliary rear wheels 67 of the dolly main body portion 20 pass through the auxiliary rear wheel guide portions 2h of the loading platform 2 and move onto the loading platform surface.

[0067] Then, when the in-vehicle folding dolly 10 has advanced to the forward limit position with respect to the loading platform 2 of the vehicle 1, as shown in Fig. 25, the left and right connecting lock mechanism main body portions 82 of the connecting lock mechanism 80 fixed to the vertical frame portion of the dolly main body portion 20 are connected to the left and right strikers 81 provided at the rear end of the loading platform 2. That is, in the state where the in-vehicle folding dolly 10 is mounted on the loading platform 2 of the vehicle 1, the in-vehicle folding dolly 10 and the loading platform 2 are connected. In this state, the anti-lifting convex portion 98 provided at the center of the front end of the dolly main body portion 20 enters below the pressing bar (not shown) of the loading platform 2, and the lifting of the in-vehicle folding dolly 10 with respect to the loading platform 2 is prevented.

[0068] Next, after the handle lock 49 of the operation handle portion 47 is operated in the unlock direction, the operation handle portion 47 is pushed forward. As a result, as shown in FIGS. 8 to 10, the upper end portion 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 upward (clockwise rotation in the figure) with respect to the skeleton frame 21 of the cart 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 below the loading platform 2.

[0069] Next, when unloading the in-vehicle folding cart 10 with luggage placed thereon from the loading platform 2 of the vehicle 1, first, as shown in FIG. 11, the switching lever 200y is horizontally rotated to the lowered position side. As a result, the lever side link 212 and the intermediate link 213 in the lower stage side force transmission mechanism 210p in the lock release operation box 200 are engaged in the rotation direction via the force transmission pin 201 and the like.

[0070] Next, the operation handle portion 47 is pulled backward. 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 pressing 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 protruding projection 213x of the drive link 214 and the intermediate link 213 are engaged in the rotation direction via the force transmission pin 215p and the like. Further, when the operation handle portion 47 is pulled backward, as shown in FIG. 8, the rear link mechanism 40 is deployed and the rear wheels 40b come into contact with the ground.

[0071] In this state, as shown in FIG. 17, when the release lever 200r is pulled backward, 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 body portion 217w of the unlocking wire 217 is pulled by the drive link 214, releasing the locked state of the left and right connecting lock mechanism main bodies 82. In this state, the in-vehicle folding cart 10 can be pulled out backward from the loading platform 2 of the vehicle 1.

[0072] When the in-vehicle folding cart 10 is pulled out backward, the front arms 32 of the left and right front link mechanisms 30 rotate clockwise (rotate in the deployment direction) as shown in FIGS. 23 and 24 due to the self-weight of the front wheels 30f and the like and the spring force. Also, during the deployment 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. And in the deployed state of the left and right front link mechanisms 30, as shown in FIG. 7, the lock pieces 34r of the slide portions 34 of the support arms 33 cross 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 portions 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 deployed locked state. When the left and right front link mechanisms 30 are deployed, the front wheels 30f come into contact with the ground.

[0073] Also, when the link lock mechanism 50 enters 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). As a result, the wire body portion 93w of the detection wire 93 is pulled forward, and the fall prevention hook 92 is pulled upward by the wire body portion 93w. In this state, the hook body portion 92m of the fall prevention hook 92 provided at the center of the front portion of the cart main body 20 does not hook onto the hook receiving portion 94 provided at the center of the rear portion of the loading platform 2. That is, the in-vehicle folding cart 10 is separated from the loading platform 2 and can be used as a cart.

[0074] <Correspondence between the terms used in this embodiment and the terms in the present invention> The upper force transmission mechanism 230p of the unlocking operation box 200 of the in-vehicle folding trolley 10 according to this embodiment corresponds to the force transmission mechanism of the present invention. Also, the front link mechanism 30 in this embodiment corresponds to the link mechanism of the present invention, and the front auxiliary wheel 60 corresponds to the auxiliary wheel of the present invention.

[0075] <Advantages of the in-vehicle folding trolley 10 according to this embodiment> According to the in-vehicle folding trolley 10 according to this embodiment, the link unlocking mechanism 230 is configured to be able to release the deployed locked state of the link locking mechanism 50 in a state where the mounting of the front auxiliary wheel 60 on the loading platform 2 of the vehicle 1 is detected by the auxiliary wheel mounting detection mechanism 70. For this reason, in a state where the front auxiliary wheel 60 of the trolley main body 20 is not mounted on the loading platform 2 of the vehicle 1, the deployed locked state of the link locking mechanism 50 cannot be released, and the front link mechanism 30 is held in the deployed state. Therefore, even though the front auxiliary wheel 60 is not mounted on the loading platform 2 of the vehicle 1, there is no problem that the deployed locked state of the link locking mechanism 50 is released due to an incorrect operation and the front link mechanism 30 is folded.

[0076] Also, when lowering the trolley main body 20 from the loading platform 2 of the vehicle 1, if the lock detection mechanism 96 does not detect the deployed locked state of the link locking mechanism 50, the fall prevention hook 92 of the fall prevention mechanism 90 is hooked on the hook receiving portion 94 of the loading platform 2 of the vehicle 1. Thereby, when the front link mechanism 30 is not locked during deployment, the trolley main body 20 cannot be lowered from the loading platform 2 of the vehicle 1. That is, it is possible to prevent a problem that the trolley main body 20 is lowered from the loading platform 2 of the vehicle 1 in a state where the deployment of the front link mechanism 30 is insufficient.

[0077] <Modification example> Here, the present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention. For example, in the present embodiment, an example in which the upper-stage force transmission mechanism 230p of the link lock release mechanism 230 is mechanically configured from the lever-side link 232, the intermediate link 233, the drive link 234, etc. has been shown. However, for example, instead of the upper-stage force transmission mechanism 230p, an electric control unit may be provided, and an electric signal from the release lever 200r and an electric signal from the auxiliary wheel mounting detection mechanism 70 are input to the control unit, and the deployment lock state of the link lock mechanism 50 is released by an electric output signal from the control unit. This configuration is also possible.

Explanation of Reference Numerals

[0078] 1 ··· Vehicle 2 ··· Loading Platform 10 ··· In-vehicle Folding Hand Truck 20 ··· Hand Truck Main Body 30 ··· Front Link Mechanism 30f ··· Front Wheel 34 ··· Slide Part 34r ··· Lock Piece 34s ··· Detection Piece 40 ··· Rear Link Mechanism 40b ··· Rear Wheel 50 ··· Link Lock Mechanism 53r ··· Stopper Surface 53 ··· Lock Claw 60 ··· Front Auxiliary Wheel 70 ··· Auxiliary Wheel Mounting Detection Mechanism 90 ··· Fall Prevention Mechanism 92 ··· Fall Prevention Hook 96 ··· Lock Detection Mechanism 200r · Release Lever 230 · Link Lock Release Mechanism 230p · Upper-Stage Force Transmission Mechanism

Claims

1. An in-vehicle folding cart that can be used as a cart and can be loaded onto or unloaded from the vehicle bed by an operator moving forward or backward, comprising: A cart body part on which luggage can be placed; Wheels that support the cart body part on the road surface; A mechanism that connects the wheels to the cart body part, and a link mechanism configured to be deployable or foldable; A link lock mechanism that locks the link mechanism in a deployed state when the cart body part is unloaded from the vehicle bed; A link lock release mechanism that releases the deployed lock state of the link lock mechanism; Auxiliary wheels that support the cart body part on the vehicle bed; An auxiliary wheel mounting detection mechanism that detects when the auxiliary wheels are mounted on the vehicle bed when the cart body part is loaded onto the vehicle bed; It has, and as the link mechanism, a front link mechanism that is a mechanism for connecting the front wheels to the cart body part and is configured to be deployable or foldable; The link lock release mechanism is configured to be able to release the deployed lock state of the link lock mechanism in a state where the mounting of the auxiliary wheels on the bed is detected by the auxiliary wheel mounting detection mechanism; The link lock mechanism is held in a deployed lock state by elastic force when the link mechanism and the front link mechanism move from the folded position to the deployed position; The link lock mechanism is provided on the cart body part and includes a lock claw that is held in the lock position by elastic force, and a lock piece that is provided on the link mechanism or the front link mechanism and engages with the lock claw in the deployed position; The link lock release mechanism includes a release lever that can apply an operating force for unlocking to the lock claw of the link lock mechanism; It includes a force transmission mechanism to which the operating force of the auxiliary wheel mounting detection mechanism and the operating force of the release lever are input; The force transmission mechanism is an in-vehicle folding cart that transmits the operating force of the release lever to the lock claw of the link lock mechanism in a state where both the operating force of the auxiliary wheel mounting detection mechanism and the operating force of the release lever are input.

2. The in-vehicle folding cart according to Claim 1, As the link mechanism, it has a rear link mechanism that is a mechanism for connecting the rear wheels to the cart body part and is configured to be deployable or foldable, and It has front auxiliary wheels that support the front part of the cart body part on the vehicle bed, And has. The link locking mechanism is a mechanism for locking the front link mechanism in the deployed state. The auxiliary wheel mounting detection mechanism is an in-vehicle folding trolley that is a mechanism for detecting that the front auxiliary wheel has been placed on the loading platform of the vehicle.

3. An in-vehicle folding trolley that can be mounted on or lowered from the loading platform of a vehicle by an operator moving forward or backward, A trolley body part on which goods can be placed, Wheels that support the trolley body part on the road surface, A link mechanism that is a mechanism for connecting the wheels to the trolley body part and is configured to be deployable or foldable, A link locking mechanism that locks the link mechanism in the deployed state when lowering the trolley body part from the loading platform of the vehicle, A lock detection mechanism that detects the locked state of the link locking mechanism, A fall prevention mechanism configured to be hung on the loading platform of the vehicle when lowering the trolley body part from the loading platform of the vehicle, and has An in-vehicle folding trolley in which, when lowering the trolley body part from the loading platform of the vehicle, if the lock detection mechanism does not detect the locked state of the link locking mechanism, the fall prevention mechanism is hung on the loading platform of the vehicle.

4. The in-vehicle folding trolley according to claim 3, A front link mechanism that is a mechanism for connecting the front wheels to the trolley body part and is configured to be deployable or foldable, A rear link mechanism that is a mechanism for connecting the rear wheels to the trolley body part and is configured to be deployable or foldable, and has The link locking mechanism is a mechanism for locking the front link mechanism in the deployed state. The fall prevention mechanism is an in-vehicle folding trolley that is pulled up to a position where it does not hang on the loading platform of the vehicle by receiving the operating force when the lock detection mechanism detects the deployed locked state of the link locking mechanism.

Images