JP5963630B2 - Wheelbarrow lock mechanism - Google Patents

Description

  The present invention relates to a handcart having a body frame, and in particular, is provided on a first frame member and a second frame member of a body frame that can change relative distances, and maintains a close state of the first frame member and the second frame member. The present invention relates to a locking mechanism.

  As a lock mechanism that is provided on the first frame member and the second frame member of the vehicle body frame and maintains the close state of the first frame member and the second frame member, for example, Japanese Utility Model Laid-Open No. 59-172065 (Patent Document) Those described in 1) are known. In the baby carriage described in Patent Document 1, an engagement lever is provided on a push rod as a first frame member, and an engagement portion is provided on a slider as a second frame member. When the slider slides upward along the push rod, the engaging portion of the slider automatically engages with the engaging lever that is set to the original position.

  Due to the engagement between the engagement portion and the engagement lever, the slider locks the baby carriage in the closed state without sliding downward along the push rod.

  Incidentally, the lock mechanism of Patent Document 1 includes means for disabling the engagement between the engagement lever and the engagement portion by temporarily moving the engagement lever away from the original position.

  More specifically, the engagement lever is rotatably supported via a bracket fixed to the upper end of the push rod. The engaging lever is provided with a pair of protrusions that slightly protrude laterally. The bracket is provided with a pair of holes for receiving these protrusions. When the locking with the engaging portion is released by rotating the engaging lever, the protrusion of the engaging lever is fitted into the hole of the bracket by the snap action, and the posture of the engaging lever is maintained. Thus, while the posture is maintained, the engaging lever does not engage with the engaging portion, and the disengaged state is maintained even when the bracket is in the vicinity of the engaging lever.

  The lock mechanism of Patent Literature 1 further includes means for stopping the above-described posture and returning the engagement lever to the original position.

  More specifically, a cylindrical portion that rotates around the axis of the push rod is provided at the upper end of the push rod. When the baby carriage is opened, the cylindrical portion rotates. Then, the cam provided on the cylindrical portion comes into contact with the engagement lever to forcibly remove the fitting between the projection and the hole, thereby automatically returning the engagement lever to the original position. is there.

Japanese Utility Model Publication No.59-172065

  In the conventional baby carriage as described above, the engagement lever can be automatically returned to the original position, but the present inventor has found that there is a matter to be further improved. In other words, in order to return the engaging lever to the original position, it is necessary to remove the protrusion of the engaging lever from the hole of the bracket by using a cylindrical portion which is a separate part from the engaging lever. . For this reason, when providing the engaging lever and the bracket for supporting the engaging lever of Patent Document 1 in a baby carriage having another configuration that does not have a cylindrical portion, the operator of the baby carriage manually returns the engaging lever to the original position. I had to.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a locking mechanism that is excellent in operability based on a completely new configuration, rather than fitting a protrusion of an engaging lever into a hole in a bracket.

  For this purpose, the lock mechanism of the handcart according to the present invention is included in the body frame of the handcart, and is selectively provided in a separated state separated from each other and a close state close to each other. And an engaged portion provided in the second frame member, and provided in the first frame member so as to be operable along a predetermined trajectory, and engaged at a first position on the predetermined trajectory in the proximity state. It is presupposed that an engagement member is provided that engages with a joint portion to maintain a proximity state and is disengaged from an engaged portion at a second position on a predetermined locus. The engaging member can be moved to a non-engageable position away from a predetermined locus.

  According to the present invention, since the engaging member is not only moved to the first position and the second position on the predetermined locus, but can be moved to the non-engageable position away from the predetermined locus. If the engaging member is brought into the non-engageable position, the engaging member can be prohibited from engaging the engaged portion. Accordingly, the operator maintains the non-engagement state of the lock mechanism by twisting the engagement member away from the predetermined locus, and easily changes the distance between the first frame member and the second frame member during that time. be able to.

  In particular, the present invention is capable of operating the engaging member with the remaining one hand even when the operator's one hand is blocked, and changing the vehicle body frame with the remaining one hand while maintaining the engaged state. Therefore, the operation performance of the wheelbarrow is improved.

  The second position of the engaging member is not particularly limited as long as it is a position where it cannot engage with the engaged portion. Further, the position where the engagement member cannot be engaged is not particularly limited as long as it is a position away from a predetermined locus.

  As a preferred embodiment of the present invention, there is further provided a first urging means for urging the engaging member brought into the non-engageable position to a predetermined locus. According to this embodiment, when the operator releases his / her hand from the engaging member, the engaging member is automatically returned to the predetermined locus by the action of the first biasing means. Therefore, the operability of the lock mechanism is improved. As another embodiment, the operator may manually return the engaging member to the locus.

  As a preferred embodiment of the present invention, a second urging means for urging the engaging member brought to the second position to the first position is further provided. According to this embodiment, when the operator releases the hand from the engaging member, the engaging member is automatically returned to the first position by the action of the second urging means. Therefore, the operability of the lock mechanism is improved. As another embodiment, the operator may manually return the engaging member to the first position.

  As a more preferred embodiment of the present invention, the urging force of the first urging means is relatively smaller than the urging force of the second urging means. According to such an embodiment, it is possible to relatively delay the return of the engaging member brought into the non-engageable position to the predetermined trajectory, so that it is possible to suitably maintain the non-engaged state.

  As one embodiment of the present invention, the engaging member is provided so that the base end is pivotable toward the first frame member, and the free end is pivoted along a predetermined trajectory to engage with the engaged portion. A mating engagement lever is included. According to this embodiment, the operation for engaging the lever with the engaged portion and the operation for releasing the engagement are facilitated. As another embodiment, the engagement member may be an engagement block provided to be slidable with respect to the first frame member side. The trajectory including the first position and the second position may be a circular arc curve by the engagement lever or a straight line by the engagement block.

  As a preferred embodiment of the present invention, the engagement member further includes a lever support member that is provided on the first frame member side and supports the base end of the engagement lever so as to be movable in a direction crossing a predetermined locus. According to such an embodiment, it is possible to suitably realize an operation for moving the engaging lever to the non-engageable position away from the predetermined locus. The lever support member may be, for example, a hinge, a shaft, a guide rail that supports the mating member in a slidable manner, or a spherical joint that supports the mating material in a two-dimensional direction.

  As a preferred embodiment of the present invention, the lever support member supports the first frame member so that the base end of the engagement lever can rotate in a direction crossing a predetermined locus. According to such an embodiment, the engagement lever can be twisted in a rotation direction different from the rotation pivot of the engagement lever itself, i.e., away from the predetermined locus, and the operation to make the engagement impossible position easy. Become.

  As one embodiment of the present invention, the vehicle body frame is configured to be selectively changeable between an expanded state and a folded state, and the separation positions of the first and second frame members correspond to the expanded state, and the first and second frame members The close position corresponds to the folded state. As a preferred embodiment of the present invention, the first frame member and the second frame member are a front leg and a rear leg that are rotatably connected to each other. According to this embodiment, the wheelbarrow can be maintained in the folded state, and when the folded wheelbarrow is deployed, the lock mechanism can be easily released, and the deployment operation of the wheelbarrow is improved. . As another embodiment, a structure in which the push bar is provided with the lock mechanism of the present invention in a handcart that can be switched to either a face-to-face push position or a back-face push position, and the push bar is locked at the face-to-face push position, or May be configured to be locked at the back pushing position.

  Thus, this invention can maintain the state which makes it impossible for an engaging member to engage with a to-be-engaged part by simple operation by an operator. Therefore, when one hand of the operator is closed and only the other hand is free, the locking mechanism is released with one hand, and the first frame member and the second frame member are moved by the next operation under the disengaged state. It becomes possible to separate them from each other, and the trajectory operability of the wheelbarrow is improved.

It is a side view which shows the vehicle body frame of the baby carriage provided with the locking mechanism of one Embodiment of this invention. It is a side view which shows the folding state of the vehicle body frame of FIG. It is the figure which expanded the lock mechanism provided in the embodiment, and shows an engagement state. It is the figure which made the lock mechanism of an engagement state into the cross section by IV-IV of FIG. It is a figure which shows the lock mechanism of a non-engagement state. It is a figure which shows the engagement lever made into the engagement impossible position. FIG. 7 shows an engagement lever corresponding to FIG. 6, and is a cross-sectional view taken along the line VII-VII in FIG. It is a figure which shows the locking mechanism in the middle state in which a vehicle body frame is folded. FIG. 9 shows the engagement lever corresponding to FIG. 8, and is a cross-sectional view taken along the line IX-IX in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing a body frame of a folding baby carriage as an example of a handcart. FIG. 2 is a side view showing a folded state of the vehicle body frame of FIG. The illustrated baby carriage includes the lock mechanism according to the embodiment of the present invention.

  The baby carriage is folded by reducing the size in the height direction and the width direction. The baby carriage includes a pair of front legs 1, a pair of rear legs 4, a pair of push rods 5, a pair of handle members 6, a pair of seat support rods 10, and a back cross member as main components of the body frame. 8 and a bottom cross member 9. The pair of frame members are arranged on one side in the width direction and the other side in the width direction of the baby carriage so that the width direction interval can be reduced. By reducing the distance between the two, the baby carriage is folded. On the other hand, the baby carriage is maintained in the unfolded state by maintaining the distance between the two expanded.

  Each front leg 1 extends in the vertical direction, has a front wheel 11 at its lower end, and has a connecting member 2 at its upper end. Each front wheel 11 is attached to the lower end of the front leg 1 via a caster 11c. In the unfolded state, each caster 11c is pivotable about a pivot axis perpendicular to the flat ground G, whereby the steering angle of each front wheel 11 can be changed. The connecting member 2 is fixed to the front leg 1, and has a cylindrical body 2a at the front part thereof and an overhang part 2b at the rear part thereof. A guide sleeve 3 is fixedly attached to an intermediate region of each front leg 1. The guide sleeve 3 has a cylindrical body 3a at the front portion thereof.

  Each rear leg 4 extends in the vertical direction, and has a rear wheel 14 at the lower end thereof. The upper end portion of each rear leg 4 is rotatably connected to an overhanging portion 2b of a connecting member 2 fixed to the front leg 1. With the folding operation of the baby carriage, each rear leg 4 rotates in the direction approaching each front leg 1 about the overhang portion 2b. In the folded state shown in FIG. 2, each rear leg 4 and each front leg 1 are parallel to each other. The rear wheel 14 is positioned above the front wheel 11.

  Each push bar 5 is arranged so that its lower region overlaps with each front leg 1 in the unfolded state, and extends in the vertical direction. The push bar 5 is slidably held by the connecting member 2 fixed to the front leg 1 and the cylindrical bodies 2 a and 3 a of the guide sleeve 3. Each push bar 5 slides downward on each front leg 1 in accordance with the folding operation of the baby carriage, and the lower end of each push bar 5 comes into contact with the ground G in the folded state shown in FIG. . The folded baby carriage can stand on its own by the lower end of the push rod 5 in contact with the ground G and the front wheel 11. Thus, the push bar 5 is set to a relatively upper position in the unfolded state shown in FIG. 1, and is selectively set to a relatively lower position in the folded state shown in FIG.

  Each handle member 6 extends from the upper end of each push bar 5. An operator of the baby carriage can move the baby carriage forward by holding the pair of handle members 6 with both hands.

  A pair of slide members 7 are slidably disposed on the upper region of the pair of rear legs 4. As the baby carriage is folded, the slide members 7 slide upward on the rear legs 4.

  The back cross member 8 includes a first bar member and a second bar member that are arranged so as to overlap each other and intersect in an X shape, and their upper ends are rotatably connected to the pair of slide members 7, A lower end portion is rotatably connected to a lower region of the pair of rear legs 4. The 1st bar member and the 2nd bar member are mutually connected so that rotation is possible in those crossing parts. In the deployed state of the baby carriage, the distance between the upper and lower ends of the back cross member 8 is relatively short, and the distance between the pair of rear legs 4 is relatively wide. In the folded state of the baby carriage, the distance between the upper and lower ends of the back cross member 8 is relatively long, and the distance between the pair of rear legs 4 is relatively narrow.

  The bottom cross member 9 includes a first bar member and a second bar member that intersect in an X shape, and a front end portion of the bottom cross member 9 is rotatably connected to a lower end portion of the pair of push rods 5. Is connected to an intermediate region of the pair of rear legs 4 so as to be rotatable. When the pair of push rods 5 moves downward along the front leg 1 in accordance with the folding operation of the baby carriage, the front end portion of the bottom cross member 9 connected to the lower end portion of the push rod 5 also moves downward following it, Accordingly, the pair of rear legs 4 connected to the rear end portion of the bottom cross member 9 is rotated toward the front legs 1. Further, as the amount of downward movement of the lower end portion of the push rod 5 increases, the distance between the front end portion and the rear end portion of the bottom cross member 9 becomes longer. The space between the rear legs 4 is reduced.

  The pair of seat support rods 10 are longitudinal members extending in the front-rear direction so as to support the seat portion of the cloth seat hammock 23 constituting the infant seat, and the front region or the middle region thereof is a pair of front legs 1. The rear end portion is rotatably connected to the pair of slide members 7. When the slide member 7 moves upward on the rear leg 4 in accordance with the folding operation of the baby carriage, the seat support bar 10 rotates counterclockwise in FIG. 1, and the inner side of the front leg 1 in the folded state of the baby carriage. It will be located along.

  The back cross member 8 is provided with an unfolded state locking mechanism 30 that maintains the unfolded state of the baby carriage by fixing the distance between the first and second bar members.

  As shown in FIG. 2, one front leg 1 and one rear leg 4 have a folded state lock that maintains the folded state of the baby carriage by maintaining the close state of the front leg 1 and the rear leg 4 that are close to each other in the folded state. A mechanism 40 is provided.

  The folded state lock mechanism 40 includes an engaging lever 41 that is an engaging member as a main component and an engaged portion 42. The engagement lever 41 is rotatably provided on the outer side surface of the rear leg 4 in the vehicle width direction, and the engaged portion 42 is attached and fixed to the outer side surface of the front leg 1 in the vehicle width direction.

  3 to 8 are enlarged views of the lock mechanism 40. FIG. FIG. 3 is an enlarged view of the lock mechanism shown in FIG. 2 and shows an engaged state. 4 is a cross-sectional view of the lock mechanism in the engaged state taken along the line IV-IV in FIG. 3 as viewed from the direction of the arrow. FIG. 5 is a diagram illustrating the lock mechanism in a non-engaged state. FIG. 8 is a diagram illustrating the lock mechanism in a non-engaged state, and corresponds to a state where the vehicle body frame is being folded and a deployed state. FIG. 9 shows an engagement lever corresponding to FIG. 8, and is a cross-sectional view taken along the line IX-IX in FIG. FIG. 6 to be described later is a view showing the engaging lever in the non-engageable position, and FIG. 7 to be described later is a view seen from the VII-VII direction of FIG. 3 to 7 relate to a folded state in which the front legs and the rear legs are close to each other.

  A cylindrical bracket 43 is attached and fixed to the rear leg 4. The bracket 43 is provided with a lever support member 45 so as to be rotatable around the shaft 44 through a shaft 44 extending in the vehicle width direction. The lever support member 45 has a pair of wall portions 451 arranged to face each other, and receives the base end of the engagement lever 41 between the pair of wall portions 451. And the base end of the engagement lever 41 is connected to the pivot 45p constructed between the pair of wall portions 451, and the engagement lever 41 is rotatable around the pivot 45p. The pivot 45 p extends in parallel with the rear leg 4. On the other hand, the engaging lever 41 extends at a right angle to the rear leg 4 toward the front leg 1. That is, the engagement lever 41 extends in the longitudinal direction of the baby carriage, and has the rear as a base end and the front as a free end.

  The engaging lever 41 has a U-shaped cross section having a pair of side wall portions 411 and a central wall portion 412 that connects the pair of side walls, and each side wall portion 411 is in surface contact with each wall portion 451 of the lever support member 45, The central wall portion 412 is disposed on the outer side in the vehicle width direction. The pair of side wall portions 411 and the central wall portion 412 define a space 46 that opens toward the inner side in the vehicle width direction, and the engaged portion 42 is received in this space 46. Thereby, the engaging lever 41 is engaged with the engaged portion 42. The space 46 is provided with an inner wall portion 413 formed in a planar shape extending at right angles to the longitudinal direction of the engagement lever 41. Since the inner wall portion 413 is positioned closer to the free end side than the engaged portion 42 in the space, the engaged portion 42 gets over the inner wall portion 413 in the engaged state and comes out to the free end side of the engagement lever 41. There is nothing.

  In addition, an end face wall 414 that is connected to the pair of side wall portions 411 and the central wall portion 412 and closes the end portion of the space 46 is formed at the free end of the engagement lever 41. The end face wall 414 has a corner 414c at the inner edge in the vehicle width direction. Further, this end surface protrudes outward in the vehicle width direction beyond the central wall portion 412 to form a knob portion 415.

  The basic operation of the locking mechanism 40 will be described with reference to FIGS.

  In the folded state of the baby carriage shown in FIGS. 2 to 4, the front leg 1 and the rear leg 4 are in close proximity to each other, and the engagement lever 41 is located in the vicinity of the engaged portion 42.

  The engaged portion 42 has a base side fixed to the front leg 1, and a distal end side projecting outward from the front leg 1 in the vehicle width direction, and the free end of the engaging lever 41 is between the root and the distal end of the engaged portion 42. An inclined surface 421 that comes into contact with is formed. When the baby carriage is folded, the engaging lever 41 provided on the rear leg 4 approaches the engaged portion 42 provided on the front leg 1 with reference to the folding state (FIG. 8). First, the corner 414c of the free end of the engagement lever 41 contacts the inclined surface 421, and the corner 414c slides along the inclined surface 421 and gets over the tip 422 of the engaged portion 42.

  Next, the inner wall portion 413 provided on the free end side of the engaging lever 41 also comes into contact with the inclined surface 421 and slides along the inclined surface 421 to get over the tip 422 of the engaged portion 42. As a result, the engaging lever 41 receives the engaged portion 42 in the space 46 and engages with the engaged portion 42 at the first position extending at right angles to both the rear leg 4 and the shaft 44, and is in the engaged state. Is realized (FIG. 4).

  When releasing the engagement state, the grip portion 415 of the free end of the engagement lever 41 shown in FIG. 4 is grasped with one hand, and the engagement lever 41 is moved outwardly in the vehicle width direction around the pivot 45p as shown by a thick arrow in FIG. It is good to rotate it. As a result, the engaging lever 41 is moved to a second position extending at a right angle to the rear leg 4 and extending obliquely with respect to the shaft 44, and the engaged portion 42 comes out of the space 46 and is engaged with the engaging lever 41. The engaged state with the part 42 is released (FIG. 5). A spring 48 is provided as a biasing means in the vicinity of the pivot 45p. The spring 48 is disposed along the shaft 44 on the side opposite to the free end of the engagement lever 41 when viewed from the pivot 45p, and is interposed between the engagement lever 41 and the lever support member 45 so as to be compressed. The surrounding urging force is applied to the engagement lever 41, and the engagement lever 41 is urged to the first position (FIG. 4). The first position means that the engagement lever 41 extends at a right angle to the shaft 44 as shown in FIG. 4 regardless of engagement / non-engagement, and is perpendicular to the rear leg 4 as shown in FIG. The posture that extends.

  As described so far, the engaging lever 41 draws a trajectory rotating around the pivot 45p as shown by the arc-shaped arrow A on the left side of FIG. 4 and is perpendicular to both the pivot 45p and the shaft 44. A first position that extends and a second position that intersects the axis 44 in an oblique direction are selectively used.

  In other words, a contact surface 416 that faces the lever support member 45 via a gap in the direction of the shaft 44 is formed at the base end of the engagement lever 41. When the engagement lever 41 is rotated from the first position around the pivot 45p to a predetermined angle, as shown in FIG. 5, the contact surface 416 closes the gap and contacts the lever support member 45, and further rotation is performed. regulate. As a result, the engagement lever 41 can be separated from the engaged portion 42 with an appropriate distance without excessively rotating from the first position beyond the second position.

  Next, an operation for setting the engagement lever of the lock mechanism 40 to the disengageable position will be described with further reference to FIGS.

  When performing the unfolding operation so that the folded baby carriage is in the unfolded state, the operator of the baby carriage first releases the engagement of the lock mechanism 40, and then raises the handle portion 6 upward so that the front leg 1, the rear leg 4, You have to widen the gap.

  When the engaging lever 41 is in the second position as shown in FIG. 5 in the folded state, the urging force around the pivot 45p is not provided unless the baby carriage operator continues to apply a force in the direction indicated by the thick arrow in FIG. The engagement lever 41 returns to the first position due to the action of the spring 48 for giving the re-engagement. With this, the space between the front leg 1 and the rear leg 4 cannot be widened.

  Therefore, the operator may twist the engaging lever 41 in the second position around the shaft 44 to the disengageable position shown in FIG. In the folded state, the engagement lever 41 is biased to approach the front leg 1 by a spring 48 around the pivot 45p as shown in FIG. 7, but the engagement lever 41 already has a locus including the first position and the second position. Therefore, even if the operator releases one hand from the engagement lever 41, the engagement lever 41 does not re-engage with the engaged portion 42 as shown in FIG.

  According to this embodiment, when the engaging lever 41 is twisted around the shaft 44 as shown by the arc-shaped arrow B in FIG. 6, the pivot 45p itself is also rotationally displaced, and the engaging lever 41 is formed in a circular arc on the left side in FIG. The disengageable position is away from the locus indicated by the up arrow A.

  Therefore, according to the present embodiment, once the engagement lever 41 is brought into the non-engageable position, even when the front leg 1 and the rear leg 4 are close to each other, as shown in FIGS. Even if one hand is taken off, it does not re-engage, and the operator can concentrate on the operation of unfolding the baby carriage.

  In other words, a biasing means (for example, a spring) 47 that biases the lever support member 45 in a predetermined circumferential direction is preferably provided around the shaft 44. The spring 47 is provided in a hole formed in the bracket 43, and biases the lever support member 45 at a circumferential position where the engagement lever 41 is perpendicular to the rear leg 4. Therefore, in the folded state in which the front leg 1 and the rear leg 4 are close to each other, the engaging lever 41 twisted away from the locus including the first position and the second position is shown in FIG. 42 abuts from the lateral direction at the center between the tip 422 and the root (front leg 1 side).

  The biasing force by the first biasing means (for example, the relatively thin spring 47) provided around the shaft 44 is caused by the second biasing means (for example, the relatively thick spring 48) provided around the pivot 45p. Smaller than the biasing force. For this reason, the second urging means provided around the pivot 45p is relatively superior, and the engaging lever 41 further twisted from the second position first approaches the front leg 1 and then laterally. From the center of the engaged portion 42.

  When the operator separates the front leg 1 and the rear leg 4 from each other during the operation of deploying the baby carriage, the engagement lever 41 is automatically returned to the first position by the spring 48 around the pivot 45p and the spring 47 around the shaft 44. (FIGS. 1, 8, and 9).

  Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. The locking mechanism 40 can be attached to the first frame member and the second frame member that are selectively set apart from each other between the front leg 1 and the rear leg 4 as well as in a separated state and a close state. The member engaged with the engaged portion 42 may be an engagement block provided on the rear leg 4 so as to be slidable in addition to the engagement lever 41 described above. The lever support member 45 may be provided so as to be slidable on the rear leg 4 in addition to being rotatable around the axis 44 described above. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The lock mechanism of the handcart according to the present invention is advantageously used in tools for carrying people, animals, or articles, baby carriages, elderly cars, wheelchairs, pet carts, carts, and the like.

  DESCRIPTION OF SYMBOLS 1 Front leg, 2 Connection member, 2a Cylindrical body, 2b Overhang | projection part, 3 Guide sleeve, 3a Cylindrical body, 4 Rear leg, 5 Push rod, 6 Handle member, 7 Slide member, 8 Back cross member, 9 Bottom cross member , 10 Seat support rod, 23 Seat hammock, 30 Unfolded state lock mechanism, 40, Folded state lock mechanism, 41 Engagement lever (engagement member), 42 Engaged part, 43 Bracket, 44 shaft, 45 Lever support member , 45p pivot, 46 space, 47 spring (first urging means), 48 spring (second urging means), A predetermined trajectory, B trajectory crossing the predetermined trajectory, G ground.

Claims (9)

A first frame member and a second frame member, which are included in a body frame of the handcart and are selectively separated from each other, and close to each other;
An engaged portion provided in the second frame member;
The first frame member is provided so as to be operable along a predetermined trajectory, and is engaged with the engaged portion at a first position on the trajectory in the proximity state to hold the proximity state. An engagement member that is disengaged from the engaged portion at a second position on the locus,
The handcart lock mechanism according to claim 1, wherein the engaging member is operable at an unengageable position away from the locus.   2. The handcart lock mechanism according to claim 1, further comprising a first urging unit that urges the engagement member brought into the non-engageable position toward the locus.   The handcart lock mechanism according to claim 1 or 2, further comprising second urging means for urging the engaging member in the second position toward the first position.   The handcart lock mechanism according to claim 3, wherein the urging force of the first urging means is relatively smaller than the urging force of the second urging means.   The engagement member is provided with a base end that is pivotable toward the first frame member, and an engagement lever that can be engaged with the engaged portion when the free end pivots along the locus. The pushcart lock mechanism according to any one of claims 1 to 4, further comprising:   The said engagement member is further provided in the said 1st frame member side, The lever support member which further supports the base end of the said engagement lever so that a movement in the direction which cross | intersects the said locus | trajectory is carried out. Wheelbarrow lock mechanism.   7. The handcart lock mechanism according to claim 6, wherein the lever support member supports the first frame member so that the base end of the engagement lever can rotate in a direction intersecting the locus. The vehicle body frame is configured to be selectively changeable between a deployed state and a folded state,
The separated state corresponds to the deployed state,
The handcart lock mechanism according to any one of claims 1 to 7, wherein the proximity state corresponds to the folded state.   The handcart lock mechanism according to claim 8, wherein the first frame member and the second frame member are a front leg and a rear leg that are rotatably connected to each other.

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