JP5210246B2 - Wheelbarrow - Google Patents

Description

  The present invention relates to a wheelbarrow having, for example, an elderly person or the like who can walk while supporting the body and having a seat that can be seated while walking.

  A wheelbarrow is known as an auxiliary tool for walking safely when a person with weak legs such as an elderly person goes shopping or taking a walk. The wheelbarrow includes wheels on the front and rear legs, and further includes a handle on the upper end portion of the main body frame. The user can walk safely by gripping the handle and running the wheel while supporting the body.

  Moreover, as a handcart, for example, Patent Literature 1 discloses a handcart having a seat portion that can be used instead of a chair when the user is tired during walking. In the case of the wheelbarrow, the seat is pivotally connected to the body frame, and the seat is between the seating position when used for sitting and the retracted position when not used for sitting. It can be turned.

JP 2004-90757 A

  Here, in the configuration in which the seat moves from the retracted position to the seating position by rotating in the direction of gravity drop as in Patent Document 1, when trying to sit on the seat arranged at the seating position, The seat portion does not move toward the retracted position. However, there is a concern that the seat disposed on the retracted position side may move toward the seating position due to gravity drop, contrary to the intention of the user. In this regard, in the configuration in which the seat is provided so as to be movable between the seating position and the retracted position, there is still room for improvement in terms of safety in using the seat.

  The present invention has been made in view of the above circumstances, and provides a handcart that can suitably improve safety when using a seat that is movable between a seating position and a retracted position. It is intended to provide.

  Hereinafter, means and the like effective for solving the above-described problems will be described while showing functions and effects as necessary.

  Wheelbarrow of 1st invention: The some wheel provided in the lower end of a main-body part, the handle | steering-wheel part provided in the upper end side of the said main-body part, and a manual operation for pushing and pulling, and a seat surface face upwards And a seat portion provided so as to be able to be placed at each of a seating position enabling seating and a retracted position moved from the seating position. Then, a movement path between the retracted position and the seating position of the seat portion is regulated so that a sliding movement in the front-rear direction or the lateral direction is required at least between the midway position and the seating position. A path regulating portion; a receiving portion provided on one of the side that moves integrally with the seat portion and the side that does not move integrally; and the side that moves integrally and the side that does not move integrally On the other hand, it is supported so as to be displaceable, and when the seat portion is arranged at the seating position, a movement is generated from the seating position toward the retracted position by generating a locking relationship with the receiving portion. A side that moves integrally with the seat portion of the receiving portion and the locking portion, the locking portion for regulating, and a biasing means for biasing the locking portion toward the initial position From the retracted position to the seating position In the course of the sliding movement of the seat portion, the positional relationship between the two is set so as to come into contact with the side that does not move integrally with the seat portion from the movement source side. Provided in at least one of the locking portions, and when the contact from the movement source side occurs, the movement source is displaced from the initial position side to the side against the urging force of the urging means. A guide surface that guides the displacement of the locking portion so as to release contact from the side, and the locking portion that is provided on the locking portion and is displaced from the initial position side through the guide surface. The urging force of the urging means with respect to the place supporting the locking portion or the receiving portion when the seat portion is displaced toward the initial position side with the completion of the arrangement of the seat portion at the position. A contact surface that displaces in the direction in which it is applied and contacts the direction , Characterized in that it comprises.

  According to this configuration, when the seat moves from the retracted position to the seating position, the seat is disposed at the seating position while sliding in the front-rear direction or the lateral direction. Thereby, the possibility that the movement from the retracted position side to the seating position will occur due to the gravity drop of the seat part against the intention of the user is reduced. Further, the seat portion is locked at the seating position by providing the receiving portion and the locking portion. This prevents the seat from moving from the seating position even when a force is applied to the seat to slide toward the retracted position when the user tries to sit down. .

  In addition, since the locking portion is urged toward the initial position side and the guide surface is provided, the locked state naturally occurs when the seat portion is disposed at the seating position. The person does not need to perform a special operation for causing the lock state. Furthermore, when the seat portion is placed at the seating position and is in the locked state, the contact surface of the latching portion is displaced in the direction in which the biasing force of the biasing means is applied, and the latching portion is locked. Since it abuts against the portion supporting the portion or the receiving portion, a contact sound is generated when the locked state is reached. As a result, the user can recognize not only the visual sense but also the auditory sense that the seat portion is accurately placed at the seating position and is in the locked state, so the seat portion is completely placed at the seating position. The possibility of trying to sit in spite of not having it is reduced.

  As described above, in the configuration in which the seat portion is provided so as to be movable between the seating position and the retracted position, it is possible to suitably improve the safety when using the seat portion.

  Wheelbarrow of 2nd invention: In 1st invention, while the said receiving part is provided in the said main-body part side, in any position in the case of moving between the said seating position and the said retracted positions Is also provided to support the seat portion, and when the seat portion is disposed at the seating position, the seat portion comes into contact with a portion different from the locking portion. It is characterized by restricting movement toward the front side of the seating position.

  According to the present invention, with respect to a receiving portion that is a portion that serves as a reference when the seat portion moves between the seating position and the retracted position and that restricts movement ahead of the seating position. The locked portion is locked by locking the locking portion. As a result, the alignment accuracy between the receiving portion and the locking portion at the seating position is increased, and the displacement of the seat portion disposed at the seating position is suitably suppressed. Therefore, since the user can sit on the stable seat part, the safety in using the seat part is improved.

  Wheelbarrow of 3rd invention: In the 1st or 2nd invention, when the said seat part is arrange | positioned in the said position for seating, the said handle | steering-wheel part is ahead rather than the handle frame provided in the upper end side. When projecting and moving toward the retracted position, the travel path is regulated by the path restricting unit, so that it slides downward and then falls downward on the handle frame side, and the retracted position Then, it is provided in a standing posture.

  According to the present invention, it is possible to reliably prevent the seat portion disposed at the retracted position from being automatically disposed at the seating position due to the gravity drop of the seat portion. In addition, the seat can be stored in the retracted position in a compact state.

  Wheelbarrow of 4th invention: In 1st invention of any one of 1st thru | or 3rd, the site | part which receives a weight load when a user sits in the said seat part arrange | positioned in the said position for seating is said latching Since the weight load is not applied to the locking portion, or even if the weight load is applied, the direction is against the urging force of the urging means, and the engagement is provided. The weight load is received at the receiving portion within a range in which the stopping relationship is not canceled.

  According to the present invention, since it is not necessary to receive the weight load when the user is seated on the seat portion, the biasing means does not need a biasing force to receive the weight load. Thereby, the operation force required when operating the locking portion to release the locked state is suppressed, and the operability of the releasing operation is improved.

  Wheelbarrow of the fifth invention: In any one of the first to fourth inventions, when the seat portion is disposed at the seating position, the locking portion is moved to the retracted position. In addition to the abutment surface, the abutment surface is provided with a latching surface that abuts the receiving portion from the movement source side to generate the latching relationship. It is set to the direction which cross | intersects the direction where the urging | biasing force of the urging means is provided.

  According to the present invention, it is possible to suppress the urging force of the urging means necessary to maintain the locking relationship between the locking portion and the receiving portion, and accordingly, the operability when releasing the locked state Is improved. Even in this case, an abutment surface is provided separately from the locking surface, and the abutment surface abuts in the direction in which the urging force of the urging means is applied as described above. It is possible to produce a clear contact sound when it becomes.

  Wheelbarrow of 6th invention: The some wheel provided in the lower end of the main-body part, the handle | steering-wheel part which is provided in the upper end side of the said main-body part, and is operated manually for pushing and pulling, and a seat surface face upwards And a seat portion provided so as to be able to be placed at each of a seating position enabling seating and a retracted position moved from the seating position. Then, a movement path between the retracted position and the seating position of the seat portion is regulated so that a sliding movement in the front-rear direction or the lateral direction is required at least between the midway position and the seating position. Provided to support the seat at any position when the seat moves between the seating position and the retracted position, as well as being provided on the path body and the main body side. And a receiving part that restricts movement of the seat part to the front side of the seating position by abutting a predetermined part when the seat part is arranged at the seating position; and When the seat portion is supported at the seat portion side so as to be displaceable and the seat portion is disposed at the seating position, a locking relationship is generated between the seat portion and the seating position, thereby moving from the seating position toward the retracted position. Person who regulates movement Characterized in that it comprises a part, a.

  According to this configuration, when the seat moves from the retracted position to the seating position, the seat is disposed at the seating position while sliding in the front-rear direction or the lateral direction. Thereby, the possibility that the movement from the retracted position side to the seating position will occur due to the gravity drop of the seat part against the intention of the user is reduced. Further, the seat portion is locked at the seating position by providing the receiving portion and the locking portion. This prevents the seat from moving from the seating position even when a force is applied to the seat to slide toward the retracted position when the user tries to sit down. .

  In addition, the locking portion is a part that serves as a reference when the seat moves between the seating position and the retracted position and that restricts movement ahead of the seating position. Is locked. As a result, the alignment accuracy between the receiving portion and the locking portion at the seating position is increased, and the displacement of the seat portion disposed at the seating position is suitably suppressed. Therefore, since the user can sit on the stable seat part, the safety in using the seat part is improved.

  As described above, in the configuration in which the seat portion is provided so as to be movable between the seating position and the retracted position, it is possible to suitably improve the safety when using the seat portion.

(A) is the perspective view which looked at the handcart in the state where the seat part is arrange | positioned in the seating position from back, (b) is the handcart in the state where the seat part is arrange | positioned in the retracted position from back FIG. It is a perspective view which expands and shows the seat part base periphery in the state arrange | positioned in the position for seating. (A) is a longitudinal cross-sectional view of the handcart for explaining the seating position, and (b) is a longitudinal sectional view of the handcart for explaining the retracted position. (A) is a longitudinal cross-sectional view for demonstrating the structure of a locking device, (b) is a longitudinal cross-sectional view for demonstrating the structure which concerns on the displacement control by the combination of a guide plate and an opposing frame part. (A)-(c) is explanatory drawing for demonstrating a motion of a locking device in case a seat part moves to a seating position from a retracted position.

  Hereinafter, an embodiment of the handcart to which the present invention is applied will be described. FIGS. 1A and 1B are perspective views of the handcart 10 viewed from the rear, and FIG. 1A shows a state in which a seat portion 31 described later is disposed at a seating position. b) shows a state in which the seat portion 31 is arranged at the retracted position.

  As shown in FIGS. 1A and 1B, the handcart 10 is integrated by connecting a pair of left and right metal side frame parts 12 with a synthetic resin handle frame 13 at the upper end position. The main frame 11 is provided. Each side frame portion 12 is bent at a midway position in the vertical direction so that the lower portion is directed further forward, and the front wheel 14 is rotatable at the lower end of each front leg portion 12a toward the front. Supported by the state. Two front wheels 14 are provided for each front leg 12a, but this number is arbitrary.

  The main frame 11 is assembled with a pair of left and right metal sub-frames 16 supported at a lower end portion in a state where the rear wheel 15 is rotatable. The upper end portion of each subframe 16 is pivotally supported by each side frame portion 12 so as to be inclined downward from the base of the front leg portion 12a in the corresponding side frame portion 12 to the rear. The pair of left and right subframes 16 are connected to each other through a connecting plate 17 on the lower end side.

  Further, in each side frame portion 12 of the main frame 11, the frame base portion 12b, which is an upper portion of the front leg portion 12a, can be turned at a position behind the frame base portion 12b so that it can be rotated. Is supported. The frame base 12 b corresponds to the handle frame in the handcart 10.

  The transition operation frame 21 is formed by bending a metal pipe into an arch shape. Further, the transition operation frame 21 is connected through a metal rod 23 to a pair of left and right links 22 that span the front leg portion 12a and the subframe 16 in the front-rear direction. When the transition operation frame 21 is arranged at a position where the arch portion faces upward, the handcart 10 is in the unfolded state shown in FIGS. 1 (a) and 1 (b). On the other hand, when the transition operation frame 21 is rotated so that the arch portion faces downward, the link 22 is folded, and the folded state in which the front-rear dimension is contracted more than the unfolded state (see FIG. 3B). The handcart 10 is transitioned to the state indicated by the dotted line).

  It should be noted that the transition operation frame 21 is provided with a spring 24 that applies an urging force so as to be held at each of the position where the handcart 10 is in the unfolded state and the position where the handcart 10 is in the folded state.

  The angle between the front leg portion 12a and the subframe 16 in the deployed state is set so that the posture in the deployed state can be maintained by being supported by the front and rear wheels 14 and 15 mounted on the floor or the ground. ing. In the unfolded state, the frame base 12b is inclined backward. A user of the wheelbarrow 10 such as an elderly person can walk while moving the wheelbarrow 10 forward by standing behind the wheelbarrow 10 and holding the handle frame 13 to push the wheelbarrow 10. As a result, it is possible to walk while leaving weight on the wheelbarrow 10. Further, by pulling the wheelbarrow 10, it is possible to cause the wheelbarrow 10 to travel backward.

  The frame base 12b is provided with a brake lever 25 and a holder 26 for holding the brake lever 25 at the brake position. The brake plate 27 is held by the brake lever 25 being held at the brake position. Through which the rotation of the rear wheel 15 is prevented.

  Between the pair of side frame portions 12, a reinforcing plate (not shown) for connecting both in the left-right direction is provided at a position near the front wheel 14 and a position near the lower end of the frame base portion 12b. A storage bag 28 for storing luggage is provided so as to be supported by these reinforcing plates. The storage bag 28 is supported so that the storage port faces upward regardless of whether the handcart 10 is in the expanded state or the folded state.

  Above the storage bag 28, a seat portion 31 can be arranged for a user to sit and rest in the middle of traveling. The seat 31 will be described with reference to FIG. 2 as appropriate in addition to FIG. FIG. 2 is a partially enlarged view showing the periphery of the seat portion 31 in a state where the seat portion 31 is arranged at a position that allows seating, and facilitates understanding of the configuration related to the seat portion 31. Therefore, the state where the seat portion sheet 34 is removed is shown.

  As shown in FIG. 2, the seat portion 31 is a seat in which a plurality of plates 36, 37, and 42 and a lock device 51 are mounted on a seat portion frame 33 formed by bending a metal pipe into a U shape. A part base 32 is provided. Further, as shown in FIGS. 1A and 1B, the seat portion 31 is configured so that the cushion portion 34a is placed on a surface whose outer edge is defined by a seat base 32 in a substantially rectangular shape. A seat seat 34 supported by the base 32 is provided. As shown in FIG. 1 (a), the seat portion 31 has a seating position where the seat surface of the seat portion seat 34 faces upward and allows the user to sit, and as shown in FIG. The portion 31 can be switched to a retracted position around the rear of the storage bag 28. The seat portion seat 34 is provided with a covering cloth 34b that is continuous with the cushion portion 34a. Even when the seat portion 31 is disposed at the retracted position, the storage opening of the storage bag 28 covers the covering cloth 34b. Is covered from above.

  Hereinafter, the configuration of the seat base 32 that enables the seat 31 to be switched between the seating position and the retracted position will be described in detail.

  On the side of the seat frame 33 on which the cushion portion 34a is overlapped, as shown in FIG. 2, metal reinforcing plates 36 and 37 are spanned between the pair of opposing frame portions 35 of the seat frame 33. A plurality are provided. Since the one reinforcing plate 36 is provided so as to span the edge on the free end side of the pair of opposed frame portions 35, the seat base 32 has an annular shape as a whole. In the situation where the seat portion 31 is disposed at the seating position, the seat portion base 32 has a connecting frame portion 38 connecting the pair of opposed frame portions 35 in the seat portion frame 33 as the front side, and the reinforcing plate 36 on the free end side The main frame 11 is supported in a positional relationship on the rear side.

  In detail, the shaft 41 is provided on the main frame 11 so as to span the pair of left and right frame bases 12b. The position where the shaft bar 41 is provided is at the same height as the position where the transition operation frame 21 is pivotally supported, and the shaft extends in the horizontal direction or the substantially horizontal direction at the position in the horizontal direction. A bar 41 is arranged.

  A guide space is formed in the seat base 32 so that it can be supported through the shaft rod 41. In order to form the guide space, the guide plate 42 is fixed to the opposite side of the side frame 35 of the seat frame 33 on the side opposite to the side where the reinforcing plates 36 and 37 are provided. Each guide plate 42 has the same shape, and includes a long guide wall portion 43, standing wall portions 44 and 45 erected in the same direction from both longitudinal ends of the guide wall portion 43, and the standing wall. The metal plate is bent so that the flange portions 46 and 47 from the front ends of the wall portions 44 and 45 to the outside in the longitudinal direction are generated.

  The guide plate 42 is screwed to the opposing frame portion 35 through the flange portions 46 and 47 on both sides so that a gap through which the shaft rod 41 can be inserted is formed between the opposing frame portion 35 and the guide wall portion 43. Thus, the guide space is formed. In this case, one flange portion 46 of the guide plate 42 is fixed near the free end side edge of the opposing frame portion 35, and the other flange portion 47 is located in the middle of the opposing frame portion 35 in the length direction. And fixed to the non-free end side of the intermediate position. Therefore, the guide space is formed so as to be along the opposing frame portion 35 from a position near the edge on the free end side in the opposing frame portion 35 to a position on the opposite free end side from the intermediate position of the opposing frame portion 35. Has been. The seat base 32 is supported by the main frame 11 by inserting the shaft 41 into the guide spaces on the left and right sides.

  Further, the support of the seat base 32 with respect to the main frame 11 is performed by a pair of support curved plates 48 as shown in FIG. 2 in addition to the support structure by the guide space and the shaft rod 41. Each supporting curved plate 48 is formed in the same shape by a metal plate, and is provided so as to connect a combination of the opposing frame portion 35 and the front leg portion 12a located on the same side portion. Specifically, one end side is fixed to the position where the opposite frame portion 35 is biased to the connecting frame portion 38 side relative to the guide plate 42, and the other end side is biased to the base side of the front leg portion 12a. It is pivotally supported in a rotatable state. Each support curved plate 48 is formed to be curved toward the front side toward the intermediate portion in the length direction. Here, the horizontal dimension of the seat base 32 is set to be smaller than the distance between the frame base 12b so that the seat base 32 and the frame base 12b do not interfere with each other. The positional deviation in the direction is regulated by the pair of support curved plates 48.

  As described above, the guide space is formed, and the support curved plate 48 is rotatably supported with respect to the main frame 11, whereby the seat base 32 (that is, the seat 31) is a shaft bar. The relative position with respect to the main frame 11 can be changed in a range from 41 to the standing wall portions 44 and 45 of the guide plate 42 until further movement is restricted.

  Among the relative positions, positions where movement is restricted by the standing wall portions 44 and 45 are a seating position and a retracted position. These seating position and retracted position will be described with reference to FIG. 3 in addition to FIG. 1 and FIG.

  FIG. 3A is a longitudinal sectional view of the handcart 10 for explaining the seating position, and FIG. 3B is a longitudinal sectional view of the handcart 10 for explaining the retracted position. 3A and 3B show a state in which some parts such as the transition operation frame 21 and the storage bag 28 are removed in order to facilitate understanding of the position of the seat base 32. ing.

  First, the retracted position will be described. As shown in FIG. 3 (b), the retracted position is such that the upright wall portion 45, which becomes the moving destination side when the seat portion 31 moves to the seating position, is attached to the shaft rod 41 of the main frame 11. On the other hand, it is a position that abuts obliquely from above and restricts further downward movement of the seat base 32. At this position, the seat portion 31 is in an upright posture such that the opposing frame portion 35 is along the frame base portion 12 b of the main frame 11. In addition, as shown in FIGS. 1 (b) and 3 (b), the end portion that becomes the movement source side when the seat portion 31 moves to the seating position is located below the shaft rod 41, and the front leg portion. It is in a position between 12a and the subframe 16.

  When the seat 31 is in the above-described posture at the retracted position, in the folded state of the handcart 10 in which the subframe 16 is at the position indicated by the two-dot chain line in FIG. 3B, the seat 31 is the frame base 12b. And it will be folded along the subframe 16. Therefore, the size of the handcart 10 in the folded state can be made compact.

  By pulling the upper end portion of the seat portion 31 disposed at the retracted position forward, the seat portion 31 rotates around the end portion on the main frame 11 side of the support curved plate 48 and moves forward. By performing the slide movement, it is arranged at the seating position. Here, the movement path from the retracted position to the seating position is regulated so that the movement of the seat portion 31 due to gravity drop is not possible. Thereby, it is prevented that the seat part 31 arrange | positioned in the retracted position moves to the seating position against a user's intention.

  As shown in FIG. 2, the seating position is such that the rear standing wall portion 44 of the guide plate 42 abuts against the shaft rod 41 of the main frame 11 from the rear, and the seat base 32 is further forward. This is the position where movement is restricted. At this position, as shown in FIGS. 1 (a) and 3 (a), the seat base 32 protrudes forward with respect to the shaft rod 41, and as shown in FIG. 1 (a), the cushion portion The upper surface of 34a will be in the state which faced upwards.

  In the seating position, the support curved plate 48 is positioned so that the end on the seat base 32 side is above and forward of the end on the main frame 11 side, and further toward the front in the middle of both ends. The posture is curved to be convex. Accordingly, the weight load when the user is seated on the seat portion 31 can be favorably received not only in the main frame 11 but also in the support curved plate 48. In addition, the restriction of the displacement of the seat portion 31 at the seating position is performed not only on the support curved plate 48 but also on the combination of the guide plate 42 and the opposed frame portion 35 and also on the lock device 51.

  Hereinafter, the configuration relating to the displacement regulation will be described with reference to FIG. 4 in addition to FIG. 2. 4A is a longitudinal sectional view for explaining the configuration of the locking device 51, and FIG. 4B is a longitudinal section for explaining the configuration relating to displacement restriction by the combination of the guide plate 42 and the opposed frame portion 35. FIG. FIG.

  First, the locking device 51 will be described.

  As shown in FIG. 4A, the locking device 51 includes a synthetic resin base member 52 and a synthetic resin hook member 53. The hook member 53 as the locking portion is disposed so as to face the plate-like base portion 54 of the base member 52 at a position spaced by a predetermined distance. In addition, the base member 52 is integrally formed with a pair of shaft plate portions 55 erected from both edges of the plate-like base portion 54 toward the hook member 53, and the shaft plate portions 55 are formed on the hook member 53. The shaft portion 56 is sandwiched. The hook member 53 is pivotally supported with respect to the base member 52 by fitting the shaft bracket 57 to the shaft plate portion 55 and the shaft portion 56.

  Further, the hook member 53 is urged toward the free end side of the plate-like base portion 54 from the position where the shaft fitting 57 is provided so that the hook member 53 is separated from the plate-like base portion 54 on the free end side. As an urging means, a coil spring 58 is provided in a compressed state. The hook member 53 is urged by the coil spring 58 in a direction away from the free end side of the plate-like base portion 54 with the shaft metal member 57 as the center, but the rotation is caused by a pair of shaft plate portions in the base member 52. When the hook member 53 comes into contact with the stopper plate portion 59 integrally formed so as to connect 55, further movement is restricted. This position is the initial rotation position of the hook member 53.

  Each of the plate-like base portion 54 and the hook member 53 is integrally formed with spring stopper portions 53a and 54a that protrude toward the opposite sides. Further, instead of the coil spring 58, a disc spring, a leaf spring, a rubber body, or the like may be used as the biasing means.

  The hook member 53 protrudes from the stopper plate portion 59 to the side opposite to the free end side, and a tip hook portion 61 erected in the direction in which the surface facing the plate-like base portion 54 faces is integrated with the end portion. Is formed. Further, on the free end side opposite to the side on which the tip hook portion 61 is formed, knobs 62 and 63 are integrally formed on the plate-like base portion 54 and the hook member 53, respectively. The user can turn the hook member 53 from the initial turning position in a direction against the urging force by picking the knobs 62 and 63. In this case, the urging force of the coil spring 58 is set so that a user who is relatively weak, such as an elderly person, can perform the rotation operation satisfactorily.

  As shown in FIGS. 2 and 4A, the locking device 51 has a plate-like base portion 54 screwed to a reinforcing plate 36 provided on an edge portion on the movement source side to the seating position. As a result, the seat frame 33 is integrated. By arranging the locking device 51 in this way, the plate-like base 54 is on the upper side and the hook member 53 is on the lower side in the seating position, and the pivot shaft of the hook member 53 is in the lateral direction. Further, the lock device 51 is arranged so that the tip hook portion 61 protrudes toward the connecting frame portion 38 side of the seat frame 33 and the pair of knobs 62 and 63 protrude on the opposite side. Incidentally, as shown in FIG. 1A, the knobs 62 and 63 are exposed without being covered by the cushion part 34 a attached to the seat base 32. Further, only one locking device 51 is provided, and the position thereof is an intermediate position in the length direction of the reinforcing plate 36 or a position in the vicinity of the intermediate position.

  The hook member 53 of the lock device 51 includes the tip hook portion 61 as described above. As shown in FIG. 4A, the tip hook portion 61 includes a front side surface 64 that becomes the movement destination side when the seat portion 31 moves to the seating position, and an original side that becomes the movement source side during the movement. And a surface 65.

  Of these surfaces 64, 65, the front surface 64 is formed as an inclined surface that is inclined so that the protruding tip side of the tip hook portion 61 becomes the movement source side to the seating position. Further, the position of the hook member 53 is set so that the front surface 64 contacts the shaft rod 41 from the movement source side during the movement of the seat portion 31 to the seating position. Then, when the front surface 64 abuts on the shaft rod 41, the hook member 53 is rotated to the side where the contact between the surface 64 and the shaft rod 41 is eliminated through a load applied to the front surface 64. It is provided to be movable. Therefore, when the seat portion 31 is moved from the retracted position to the seating position, the front surface 64 of the hook member 53 comes into contact with the shaft bar 41 from the movement source side. By moving the seat portion 31 toward the front end, the tip hook portion 61 can naturally get over the shaft rod 41. In this respect, it can be said that the front surface 64 has a function as a guide surface.

  Incidentally, since the outer edge of the cross section of the shaft bar 41 is circular, the surface of the shaft bar 41 also has a function as a guide surface that allows the hook member 53 to escape to the outside. The shaft bar 41 has a tubular shape and is supported so as to be rotatable with respect to the support shaft portion 66 fixed to the main frame 11. Due to this configuration, when the shaft bar 41 abuts on the front surface 64, the above overcoming is likely to occur due to the rotation of the shaft bar 41.

  On the other hand, the surface 65 on the original side has a flat shape, and the direction of the surface is generally on the source side to the seating position. Here, the position of the tip hook portion 61 is relative to the shaft rod 41 from the destination side to the seating position, that is, from the source side to the retracted position in the situation where the seat portion 31 is disposed at the seating position. Thus, the original side surface 65 is set to contact. And as already demonstrated in the position for seating, the standing wall part 44 of the back | inner side in the guide plate 42 contact | abuts with respect to the axial rod 41 from back. In other words, at the seating position, the shaft 41 is sandwiched between the upright wall portion 44 and the original surface 65, and not only the movement toward the seating position but also the movement toward the retracted position is restricted. Is done.

  In particular, the original surface 65 is formed as an inclined surface that is inclined so that the protruding tip side of the tip hook portion 61 becomes the movement source side to the seating position, and when the movement to the retracted position is attempted. The direction of the force applied from the shaft rod 41 to the original surface 65 does not have a component in the direction of rotating the hook member 53 against the biasing force. Thereby, the locking by the locking device 51 in the seating position can be firmly performed while suppressing the biasing force of the coil spring 58 of the locking device 51 to some extent. Therefore, it is possible to achieve both improvement in the operability of the locking device 51 by the user and improvement in the stability of the lock at the sitting position. The position of the contact point is set in a range that does not hinder the rotation of the hook member 53 by manually operating the knobs 62 and 63 of the lock device 51.

  The contact portion between the hook member 53 and the shaft bar 41 at the seating position is present in addition to the original surface 65. Specifically, the initial rotation position of the hook member 53 is the front end side of the stopper plate portion 59 and the proximal end side of the front end hook portion 61 at the seating position of the seat portion 31. The intermediate portion 67 is set so as not to return to the initial rotation position by contacting the shaft rod 41 in the direction in which the urging force is generated. Thus, the effect | action which the intermediate part 67 contact | abuts to the shaft 41 is demonstrated, referring FIG. FIGS. 5A to 5C are explanatory views for explaining the movement of the locking device 51 when the seat portion 31 moves from the retracted position to the seating position.

  As shown in FIG. 5A, when the seat portion 31 is moved toward the seating position, the front surface 64 of the tip hook portion 61 first comes into contact with the shaft rod 41 from the movement source side. In the state shown in FIG. 5A, the hook member 53 is disposed at the initial rotation position.

  Thereafter, when the seat portion 31 further moves toward the seating position, the front surface 64 and the surface of the shaft rod 41 function as a guide surface, and further, the shaft rod 41 rotates, whereby FIG. As shown in b), the hook member 53 rotates against the urging force of the coil spring 58, and the tip hook portion 61 gets over the shaft bar 41.

  Thereafter, when the seat portion 31 further moves toward the seating position, the tip hook portion 61 moves to the destination side with respect to the shaft bar 41, and the hook member 53 is urged by the biasing force of the coil spring 58 along with the movement. Tries to return towards the initial pivot position. In this case, as shown in FIG. 5C, the intermediate portion 67 of the hook member 53 strikes the shaft bar 41 from below by virtue of the biasing force. Thus, the user can clearly recognize through hearing that the seat portion 31 is locked at the seating position by the contact sound.

  In particular, since the contact portion between the intermediate portion 67 and the shaft rod 41 is a position biased toward the rotation tip side of the hook member 53, the biasing force applied to the contact portion becomes relatively large, and the contact portion It is possible to increase the sound volume. In order to increase the volume of the contact sound, the shaft bar 41 is also made of metal. Furthermore, since the shaft bar 41 is tubular and is supported rotatably with respect to the support shaft portion 66, and there is a gap (not shown) between them, the shaft rod 41 and the support shaft portion 66 is also expected to occur.

  Next, a configuration related to displacement restriction by a combination of the opposed frame portion 35 and the guide plate 42 will be described.

  As shown in FIG. 4B, in a situation where the seat portion 31 is disposed at the seating position, the pair of left and right opposing frame portions 35 are placed on the shaft bar 41 from above. Thus, the weight load when the user is seated on the seat portion 31 is received by the shaft bar 41. Thus, by receiving the weight load by the contact between the opposed frame portion 35 and the shaft rod 41, it is not necessary to receive the weight load in the lock device 51. Therefore, it is not necessary to set the biasing force of the coil spring 58 of the lock device 51 to a level that is intended for receiving a heavy load, so that the operability of the lock device 51 can be improved.

  It is also conceivable that the user is seated at a position biased toward the front end side of the seat portion 31. In this case, the seat portion 31 is tilted so that the seat surface is inclined downward toward the front side. At this time, the guide wall portion 43 of the guide plate 42 contacts the shaft rod 41 from below. In contact with it, further tilting is restricted. And the possibility that a user will slip off from the seat part 31 is reduced by regulating the inclination in this way. In this case, the weight load when the seat portion 31 is tilted is received by the contact between the shaft rod 41 and the guide wall portion 43, and the lock device 51 does not need to receive the weight load. In particular, since the hook member 53 of the locking device 51 is in contact with the shaft 41 from below, when the seat portion 31 is tilted as described above, the hook member 53 is in a direction against the urging force. Rotate and do not need to receive any weight load. In this respect, the operability of the locking device 51 can be improved, and further, the locking device 51 can be prevented from being damaged when the seat portion 31 is tilted forward. Even if the seat portion 31 is inclined and the hook member 53 is rotated in a direction against the urging force, the seat portion 31 is further increased as long as the locking relationship between the hook member 53 and the shaft rod 41 is not released. The inclination of is regulated.

  According to the embodiment described in detail above, the following excellent effects are obtained.

  In the configuration in which the seat portion 31 is provided to slide backward at the start of movement from the seating position, when the seat portion 31 is moved to the seating position, the shaft rod 41 and the lock device 51 automatically In the locked state, the hook member 53 collides with the shaft rod 41 when the locked state is reached, and a contact sound is generated. Thereby, the workability for locking the seat portion 31 at the seating position can be improved, and the user can be clearly recognized through hearing that the seat portion 31 is locked at the seating position. .

  Since the weight load applied when the user is seated on the seat portion 31 is received at a place other than the lock device 51, the biasing force of the coil spring 58 that biases the hook member 53 toward the initial rotation position is applied to the weight load. Can be set without the intention of receiving. Therefore, since it becomes possible to suppress the urging force, it is possible to improve the operability when releasing the locked state and to reduce the operating force required when moving the seat portion 31 to the seating position. Figured.

  Locking by the locking device 51 is performed by locking the hook member 53 to the shaft rod 41 that supports the seat portion 31 and restricts the movement to the front side of the seating position. As a result, compared to a configuration in which a locking relationship is generated at a position away from the shaft bar 41 and locking is performed, the alignment accuracy of the portion where the locking relationship is generated is improved, and the seat portion 31 is loose at the seating position. Can be reduced. In particular, since the shaft bar 41 is sandwiched between the guide plate 42 and the hook member 53 at the seating position, the occurrence of backlash can be further reduced.

  The present invention is not limited to the description of the above embodiment, and may be implemented as follows, for example.

  (1) Among the engaging portion (corresponding to the hook member 53) and the receiving portion (corresponding to the shaft bar 41) for locking the seat portion 31 at the seating position, the receiving portion is provided on the seat portion 31 side, A stop may be provided on the main frame 11 side. In addition, one of the locking portion and the receiving portion is provided at a site that moves integrally with the seat portion 31 although it is provided separately from the seat portion 31 such as the support curved plate 48 and the other is the front leg portion. You may provide in the site | part which does not move integrally with the seat part 31, such as 12a.

  (2) The hook member 53 may be configured to return to the initial rotation position when a locking relationship is generated with the shaft rod 41. In this case, similarly to the handcart 10, the shaft rod 41 and the hook member 53 may be brought into contact with each other to generate a contact sound when the seat portion 31 is disposed at the seating position. Instead of this, for example, the intermediate portion 67 may be brought into contact with the stopper plate 59 to generate the contact sound. In the configuration in which the contact noise is generated by the contact between the intermediate portion 67 and the stopper plate portion 59 as described above, at least one of the contact portions is preferably made of metal.

  (3) The direction in which the seat portion 31 slides between the seating position and the retracted position is not limited to the front-rear direction, and may be a lateral direction. In this case, it is necessary to provide the lock device 51 so as to prevent the lateral movement.

  (4) The locking device 51 is provided sideways so that the rotation axis of the hook member 53 is in the vertical direction, and a receiving portion extending in the vertical direction on the main frame 11 side such as the shaft rod 41 is formed. When the stop relationship is generated, the hook member 53 may be displaced so as to wrap around the receiving portion from the side. In this case, the weight load when seated on the seat portion 31 is not applied to the hook member 53 or is difficult to be applied. Moreover, the hook member 53 is good also as a structure which produces a latching relationship between the site | parts which do not receive the weight load at the time of sitting on the seat part 31. FIG. Further, a plurality of locking devices 51 may be provided, and the locking device 51 may be provided on the lateral side or the front side of the seat portion 31.

  DESCRIPTION OF SYMBOLS 10 ... Wheelbarrow, 11 ... Main frame which comprises main body part, 13 ... Handle frame, 14 ... Front wheel, 15 ... Rear wheel, 16 ... Sub frame which comprises main body part, 31 ... Seat part, 32 ... Seat part Base, 34 ... Seat seat, 41 ... Shaft bar as receiving part, 42 ... Guide plate as path restricting part, 51 ... Locking device, 53 ... Hook member as locking part, 58 ... Coil spring as urging means 64 ... A front surface as a guide surface, 65 ... An original surface as a locking surface, 67 ... An intermediate portion constituting a contact surface.

Claims (6)

A plurality of wheels provided at the lower end of the main body,
A handle portion that is provided on the upper end side of the main body and is manually operated for pushing and pulling;
A seat portion provided so as to be arranged at each of a seating position where the seating surface can be seated by facing upward and a retracted position moved from the seating position;
In a wheelbarrow equipped with
A path regulation that regulates a movement path between the retracted position and the seating position of the seat so that a sliding movement in the front-rear direction or the lateral direction is required at least between the midway position and the seating position. And
A receiving portion provided on one of the side that moves integrally with the seat and the side that does not move integrally;
The other side of the integrally moving side and the non-moving side is supported so as to be displaceable, and when the seat portion is disposed at the seating position, a locking relationship is established with the receiving portion. A locking portion for restricting movement from the seating position toward the retracted position by causing
Biasing means for biasing the locking portion toward the initial position;
With
The side of the receiving portion and the locking portion that moves integrally with the seat portion moves integrally with the seat portion in the process of sliding the seat portion from the retracted position to the seating position. The positional relationship between the two is set so as to come into contact with the non-moving side from the movement source side,
Further, provided in at least one of the receiving portion and the locking portion, when contact from the movement source side occurs, from the initial position side to a side that resists the urging force of the urging means. A guide surface that guides the displacement of the locking portion so as to displace and release the contact from the movement source side;
When the locking portion provided on the locking portion and displaced from the initial position side through the guide surface is displaced toward the initial position side with the completion of the placement of the seat portion at the seating position. Further, a contact surface that is displaced in a direction in which a biasing force of the biasing means is applied to a portion that supports the locking portion or the receiving portion and contacts in the direction,
A wheelbarrow characterized by comprising:   The receiving portion is provided on the main body portion side, and is provided to support the seat portion at any position when moving between the seating position and the retracted position, Further, when the seat portion is disposed at the seating position, the seat portion is restricted from moving forward with respect to the seating position by abutting against a portion different from the locking portion. The handcart according to claim 1, wherein:   When the seat portion is disposed at the seating position, the handle portion projects forward from the handle frame provided on the upper end side, and when the seat portion moves toward the retracted position, the path By restricting the movement path by the restricting portion, it is provided so as to fall downward on the handle frame side after sliding and moving backward, and to stand upright at the retracted position. The wheelbarrow according to claim 1 or 2.   Since the portion that receives the weight load when the user is seated on the seat portion that is disposed at the seating position is provided separately from the locking portion, the weight load is not applied to the locking portion. Or, even if the weight load is applied, the direction is such that the direction against the urging force of the urging means and the weight load is received at the receiving portion within a range in which the locking relationship is not released. The handcart according to any one of claims 1 to 3, wherein the handcart is provided. When the seat portion is disposed at the seating position, the locking portion is brought into contact with the receiving portion from the movement source side when moving to the retracted position, thereby generating the locking relationship. A surface separate from the contact surface,
5. The contact direction of the locking surface with the receiving portion is set in a direction intersecting the direction in which the biasing force of the biasing means is applied. Or the wheelbarrow described in 1. A plurality of wheels provided at the lower end of the main body,
A handle portion that is provided on the upper end side of the main body and is manually operated for pushing and pulling;
A seat portion provided so as to be able to be placed at each of a seating position where the seating surface can be seated by facing upward and a retracted position displaced from the seating position;
In a wheelbarrow equipped with
A path regulation that regulates a movement path between the retracted position and the seating position of the seat so that a sliding movement in the front-rear direction or the lateral direction is required at least between the midway position and the seating position. And
Provided on the main body side, and provided to support the seat at any position when the seat moves between the seating position and the retracted position; A receiving portion that restricts movement of the seat portion toward the front side of the seating position by contacting a predetermined portion when the seat portion is disposed at the seating position;
When the seat portion is supported at the seat portion side so as to be displaceable and the seat portion is disposed at the seating position, a locking relationship is generated between the seat portion and the seating position, thereby moving the seat portion toward the retracted position. A locking part for restricting movement,
A wheelbarrow characterized by comprising: