JP6085582B2 - Wheelbarrow and its assembly method - Google Patents

Description

  The present invention relates to a handcart such as a silver car or a shopping car and an assembling method thereof.

  This type of wheelbarrow includes, for example, left and right front wheel legs that rotatably support a front wheel at a lower end, left and right rear wheel legs that rotatably support a rear wheel at a lower end, a handle, and the handle from below. Supporting left and right handle columns, the user holds the handle so that the user can walk safely while pushing the wheelbarrow.

  In addition, some wheelbarrows have a shopping basket and can store luggage such as shopping, and others have a seat and can sit on the seat when tired.

  Such a wheelbarrow has left and right vertical cylinder frames that slidably support each handle column in the vertical direction, and each front wheel leg and each rear wheel leg are used at the lower end of each vertical cylinder frame. A hook member provided with a pivotal support for pivotally pivoting the upper end of each front wheel leg and each rear wheel leg so that the open leg position in the folded state and the closed leg position in the folded state can be selected. Has also been proposed (see Patent Document 1).

In this handcart, each front wheel leg and each rear wheel leg are opened and closed in conjunction with the slide of each handle column. Specifically, by depressing the operation handle for opening and closing the legs, each front wheel leg portion and each rear wheel leg portion in the runnable state are folded into a closed leg state, and each front wheel is lifted by lifting the operation handle from this folded state. The leg and each rear wheel leg can be opened again so that they can run again, and the handle column can be slid up and down by releasing the locking means of the handle column and the height of the handle The position can be adjusted.

  That is, in this wheelbarrow, if each front wheel leg and each rear wheel leg are closed, and the lock means is released and the lock of the handle column is pushed downward, not only the front-rear direction but also the vertical The size of the direction can be reduced, and it is advantageous in that it is compact when not in use and requires a small storage space.

JP 2012-56537 A

By the way, in the handcart of the said patent document 1, the left and right handle support | pillar part is supported so that it can slide to the up-down direction separately right and left with respect to each vertical cylinder frame.

  In that case, since the left and right vertical cylinder frames themselves are separate from each other, in order to support the left and right handle columns so that they can slide smoothly in the vertical direction, It is necessary to assemble each vertical cylinder frame while ensuring a sufficient degree of parallelism.

  However, an error is likely to occur when the left and right vertical cylinder frames are assembled to the peripheral members, and the parallelism between the vertical cylinder frames becomes insufficient, and a twist is likely to occur between the vertical cylinder frames. It has been difficult to smoothly slide the left and right handle columns in the vertical direction.

  The present invention has been made in view of such a point, and the object of the present invention is to secure the parallelism between the left and right vertical cylinder frames in advance so that the vertical cylinder frames can be connected to each other. It is an object of the present invention to provide a handcart that can reliably eliminate the twist of the left and right and to smoothly slide the left and right handle column portions in the vertical direction and an assembling method thereof.

In order to achieve the above-mentioned object, the solution taken by the present invention includes left and right front wheel legs that rotatably support the front wheel at the lower end, left and right rear wheel legs that rotatably support the rear wheel at the lower end, and a handle. And left and right handle column portions that support the handle from below, and the handle column portions are slidably supported in the vertical direction, and the front wheel leg portions and the rear wheel leg portions are in an open leg position in use. Left and right vertical cylinder frames each having a pivotal support portion pivotably supporting the upper end portion of each front wheel leg portion and each rear wheel leg portion at the lower end so that the closed leg position in the folded state can be selected. It is premised on a handcart that opens and closes each front wheel leg and each rear wheel leg in conjunction with the sliding of the handle column. And each said vertical cylinder frame is previously formed as a substantially rectangular frame-shaped frame base so that mutual parallelism is ensured by a pair of upper and lower horizontal frames that extend in the horizontal direction between the upper and lower ends. Keep it. The handle bases are slidably supported in the vertical direction via the vertical cylinder frames on the pre-formed frame base, and the pivot support parts at the lower ends of the vertical cylinder frames are used to support the handle columns. The upper end of each front wheel leg and each rear wheel leg is pivotally supported. Further, each handle can be slidable only when the front wheel leg and the rear wheel leg are opened and closed only on the upper horizontal frame of the pair of upper and lower horizontal frames. A pin operation lever for releasing the insertion of the slide lock pin from the upper lateral frame into the lock pin insertion hole of the support column is provided.

  Further, it is preferable that each handle column part is formed in an elliptical cross section, and each vertical cylinder frame is formed in an elliptical cross section that matches the sectional shape of each handle column part.

  Further, a front extending portion is provided at the upper end portion of each front wheel leg portion and the rear end thereof is pivotally supported by the pivot supporting portion and extends forward. The front extending portion includes the front wheel leg portion and the rear wheel. Fixes both ends of a flat bar bent in a U shape or U shape in plan view so as to hold the front side portion of the upper edge of the shopping basket accommodated in the accommodation space formed between the legs It is preferable to do.

In order to achieve the above object, the solution provided by the present invention includes left and right front wheel legs that rotatably support a front wheel at a lower end, and left and right rear wheel legs that rotatably support a rear wheel at a lower end. The steering wheel, the left and right handle columns supporting the handle from below, and the handle columns supported slidably in the vertical direction, and the front and rear wheel legs are in use. Left and right vertical cylinder frames having pivot portions at the lower end for pivotally supporting the upper end portions of the front wheel legs and the rear wheel legs so that the position and the closed leg position in the folded state can be selected, It is premised on a method of assembling a handcart in which the front wheel legs and the rear wheel legs are opened and closed in conjunction with the sliding of the handle columns. A frame having a substantially rectangular frame shape is secured so that the vertical cylinder frames are parallel to each other by a pair of upper and lower horizontal frames that extend in the horizontal direction between the upper and lower ends of the vertical cylinder frames. from previously formed as a body base, the frame base and the pre-formed, the while supporting the respective handle post portion through the respective vertical tubular frame slidably in the vertical direction, the lower end of each vertical tube frame The upper end portions of the front wheel leg portions and the rear wheel leg portions are pivotally supported via the pivot portions, respectively. Further, each handle can be slidable only when the front wheel leg and the rear wheel leg are opened and closed only on the upper horizontal frame of the pair of upper and lower horizontal frames. A pin operation lever for releasing the insertion of the slide lock pin from the upper lateral frame into the lock pin insertion hole of the support column is provided.

  In summary, according to the handcart and the assembling method thereof of the present invention, a substantially rectangular frame-like frame is formed by a pair of upper and lower horizontal frames that connect the left and right vertical cylinder frames extending in the left-right direction between the upper and lower ends. By forming in advance as a body base, the parallelism between the left and right vertical cylinder frames is secured in advance. Thereby, the twist between right and left vertical cylinder frames can be canceled reliably, and the left and right handle column parts can be smoothly slid in the vertical direction.

  In addition, each front wheel leg and each rear wheel leg are attached to the frame base by pivotally supporting the front wheel leg and the upper end of each rear wheel leg through the pivot of each vertical cylinder frame. It can be assembled to the vertical cylinder frame with high accuracy.

  Also, by forming each vertical cylinder frame in a cross-sectional elliptical shape that matches the cross-sectional shape of each handle column part formed in a cross-sectional elliptical shape, the rotation of each handle column part relative to each vertical cylinder frame is regulated, The handle column can be slid more smoothly in the vertical direction.

  Furthermore, both ends of the flat bar that holds the front side portion of the upper edge of the shopping basket accommodated in the accommodation space between each front wheel leg and each rear wheel leg, the rear end is pivotally supported by the pivot and the front. The rigidity of the flat bar can be increased by the front extension part of each front wheel leg part by fixing the front bar leg part to the front extension part of each front wheel leg part. Even if it fixes to the inner side which opposes, the magnitude | size of an accommodation space is not reduced.

It is the perspective view which looked at the use condition (open leg state) of the handcart which concerns on embodiment of this invention from diagonally back. It is the perspective view which looked at the wheelbarrow main body of the wheelbarrow of FIG. 1 from diagonally forward. It is the schematic which looked at the use condition of the handcart main body of FIG. 2 from the side direction. It is the schematic seen from the side in the state (closed leg state) which folded the handcart main body of FIG. It is sectional drawing which illustrates roughly the opening-and-closing mechanism of the front-wheel leg part and rear-wheel leg part of the handcart of FIG. It is sectional drawing which illustrates roughly the locked state by the slide lock pin of the handle | steering-wheel support | pillar part of the handcart of FIG. It is the top view which looked at the large diameter cylinder part of the handcart of FIG. 6 from the axial direction. FIG. 2 is a cross-sectional view schematically illustrating a slide fixing state between a small diameter cylindrical portion and a large diameter cylindrical portion of the handcart of FIG. 1. It is explanatory drawing of the pipe which comprises the large diameter cylinder part and connection part of the handcart of FIG. 6, (a) is a front view, (b) is a top view, (c) has shown sectional drawing, respectively. . It is a disassembled perspective view of the slide lock pin part of the handcart of FIG. It is a principal part front view of the upper side horizontal cylinder frame of the handcart of FIG. It is a principal part perspective view of the upper side horizontal cylinder frame of the handcart of FIG. It is sectional drawing which illustrates roughly the locked state by the slide lock pin of the handle | steering-wheel pillar part of the handcart which concerns on the modification of this Embodiment. FIG. 14 is a cross-sectional view schematically illustrating a slide fixing state between the small diameter cylindrical portion and the large diameter cylindrical portion of the handcart of FIG. 13.

  Hereinafter, a handcart according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of the state of use of the handcart according to the embodiment of the present invention (open leg state) as viewed obliquely from the rear, FIG. 2 is a perspective view of the handcart main body of the handcart as viewed from obliquely forward, FIG. FIG. 4 is a schematic view of the state of use of the handcart main body viewed from the side, and FIG. 4 is a schematic view of the handcart main body viewed from the side in a folded state (closed leg state).

  As shown in FIG. 1, the handcart A is used as a silver car, and includes a handcart main body A <b> 1 and a luggage storage portion A <b> 2 as a storage space for storing a shopping basket B. As shown in FIGS. 1 to 4, the handcart main body A <b> 1 includes a pair of left and right front wheel legs 1, 1, a pair of left and right rear wheel legs 2, 2, a handle frame 3, and a pair of left and right vertical cylinder frames. 41, 41.

  The left and right front wheel leg portions 1, 1 include a front wheel 11 that is rotatably supported at the respective lower ends. On the other hand, the left and right rear wheel leg portions 2 and 2 are provided with rear wheels 21 rotatably supported at respective lower ends. Moreover, the brake 22 which brakes each rear wheel 21 is rotatably supported at the lower ends of the left and right rear wheel legs 2, 2.

  The handle frame 3 includes a substantially U-shaped handle member 31 and left and right handle column portions 32 and 32 that support both ends (lower ends in FIGS. 1 and 2) of the handle member 31 from below. . The handle member 31 has a handle 33 extending in the left-right direction at the bottom (the upper end in FIGS. 1 and 2), a pair of left and right brake levers 34 and 34 provided on the left and right sides of the handle 33, and A pair of left and right brake operation wires 35 and 35 operated by the brake levers 34 and 34 are provided. Each brake lever 34 is configured to brake the rear wheel 21 by rotating the brake 22 via the brake operation wire 35 when operated. The left and right handle column portions 32, 32 include a small-diameter cylindrical portion 36 and a large-diameter cylindrical portion 37 that supports the small-diameter cylindrical portion 36 slidably while being guided by the inner wall surface. The small-diameter cylindrical portion 36 and the large-diameter cylindrical portion 37 are formed from a pipe obtained by extrusion molding of aluminum, aluminum alloy, stainless steel, steel, or the like, whereas the small-diameter cylindrical portion 36 is a perfect circle shape, whereas the large-diameter cylindrical portion 37 has an elliptical shape.

  The left and right vertical cylinder frames 41 and 41 are formed of hard nylon resin, and are formed in an elliptical shape whose inner peripheral surface substantially coincides with the outer peripheral surface of the large-diameter cylindrical portion 37 of each handle column 32. The left and right vertical cylinder frames 41, 41 are connected by an upper horizontal cylinder frame 42 as an upper horizontal frame extending in the left-right direction between the upper ends thereof. The upper horizontal cylinder frame 42 is formed in a substantially annular cross section. Further, the left and right vertical cylinder frames 41 are connected by a lower horizontal cylinder frame 43 as a lower horizontal frame extending in the left-right direction between the lower ends thereof. The lower horizontal cylinder frame 43 is formed in a substantially track shape in cross section.

  The left and right vertical cylinder frames 41 have upper cylinder pieces 411 and 411 that protrude inward in the left-right direction opposite to each other at the upper ends thereof, and lower cylinder pieces that protrude inward in the left-right direction at lower ends thereof. 412 and 412 are provided. And the inner peripheral surface of each upper side cylinder piece 411 is formed in the shape which corresponds with the outer peripheral surface of the upper side horizontal cylinder frame 42, and is fastened with the screw in the state which penetrated the right and left both ends of the upper side horizontal cylinder frame 42. . In addition, the inner peripheral surface of each lower cylindrical piece 412 is formed in a shape that coincides with the outer peripheral surface of the lower horizontal cylindrical frame 43, and is fixed by screws with both left and right ends of the lower horizontal cylindrical frame 43 being inserted. doing. The upper horizontal cylinder frame 42 and the lower horizontal cylinder frame 43 are formed from a pipe obtained by extrusion-molding aluminum, an aluminum alloy, stainless steel, steel, or the like.

  The left and right vertical cylinder frames 41 are formed in advance as a substantially rectangular frame-shaped frame base 4 by the upper horizontal cylinder frame 42 and the lower horizontal cylinder frame 43. In each vertical cylinder frame 41 of the frame base 4, large-diameter cylindrical portions 37 of the left and right handle column portions 32, 32 are inserted so as to be slidable in the vertical direction. Further, the lower end portions of the large-diameter cylindrical portions 37 of the left and right handle column portions 32, 32 protrude downward from the lower ends of the respective vertical cylindrical frames 41, and are bent backward at a bending angle within 10 degrees from the vicinity of the respective middle portions. ing.

  In addition, a substantially rectangular support plate 44 as a pivot portion protruding forward is integrally provided at the lower ends of the left and right vertical cylinder frames 41 of the frame base 4. The rear end of the upper end portion of the front wheel leg portion 1 is pivotally supported at the lower portion of each support plate 44 via a shaft 441 extending in the left-right direction. A front extending portion 12 extending forward from the rear end is provided at the upper end portion of the left and right front wheel leg portions 1, 1. Further, support portions 45 as pivot portions that bulge outward in the left-right direction are integrally provided at lower ends of the left and right vertical cylinder frames 41 of the frame base 4. The upper ends of the rear wheel leg portions 2 are pivotally supported by the support portions 45 via shafts 451 extending in the left-right direction.

  FIG. 5 is a cross-sectional view schematically illustrating the opening / closing mechanism of the front wheel leg portion 1 and the rear wheel leg portion 2 of the handcart A. As shown in FIG. 5, the left and right front wheel leg portions 1, 1 are arranged at the substantially intermediate positions in the vertical direction, respectively, by way of the left and right rear wheel leg portions 2, 2 via the left and right individual link mechanisms 46, 46. It is connected to a substantially middle position in the direction. Each link mechanism 46 includes a first link plate 461, a second link plate 462, and a connecting shaft 463, respectively. One end of the first link plate 461 is pivotally supported on the first link pivot shaft 13 of the front wheel leg 1, and the other end is coupled to the second link plate 462 via a coupling shaft 463. One end of the second link plate 462 is pivotally supported by the second link pivot shaft 24 of the rear wheel leg portion 2. A motion transmission arm member 381 described later is pivotally supported on the connecting shaft 463. That is, each front wheel leg portion 1 and each rear wheel leg portion 2 is moved to the open leg position in the use state shown in FIG. The connecting shaft 463 is moved downward and rotated in conjunction with the link mechanism 46 so as to be in the closed leg position shown in FIG.

  FIG. 6 is a cross-sectional view schematically illustrating a state in which the handle column portion of the handcart A is locked by a slide lock pin, and FIG. 7 is a plan view of the large-diameter cylindrical portion 37 of the handcart A viewed from the axial direction. ing. 6 and 7, a pair of guide protrusions 375 and 375 are provided on the inner peripheral surface of the large diameter cylindrical portion 37 so as to slidably guide the small diameter cylindrical portion 36 on one side in the long diameter direction. . A gap 376 is formed between the small diameter cylindrical portion 36 and the other side in the long diameter direction inside the large diameter cylindrical portion 37.

  FIG. 8 is a cross-sectional view schematically illustrating the sliding fixed state of the small diameter cylindrical portion 36 and the large diameter cylindrical portion 37 of the handcart A. As shown in FIG. 8, the small-diameter cylindrical portion 36 has three pairs of first pin insertion holes 363 (only one pair is shown in FIG. 8) in the longitudinal direction of the small-diameter cylindrical portion 36, that is, the vertical direction. .

  FIG. 9 is an explanatory view of a pipe constituting the large-diameter cylindrical portion 37 and the connecting portion of the handcart A, wherein (a) is a front view, (b) is a plan view, and (c) is a cross-sectional view. ing. In FIG. 9, the protruding ends of the large-diameter cylindrical portions 37 are connected to each other by column support portions 38 extending in the left-right direction between the protruding ends. The column connecting portion 38 and the large diameter cylindrical portion 37 of each handle column 32 are formed in a substantially U shape by bending a single pipe. The lower end portion of the large-diameter cylindrical portion 37 includes a pair of second pin insertion holes 371, one upper lock pin insertion hole 372, and one lower lock pin insertion hole 373. Further, a motion transmitting arm member 381 is fixed to the lower end of each large diameter cylindrical portion 37 by a screw 382.

  The pair of second pin insertion holes 371 does not pass through the center of the large-diameter cylindrical portion 37, and is drilled at the upper end of the large-diameter cylindrical portion 37 so that the central axis is orthogonal to the central axis of the small-diameter cylindrical portion 36. . Then, the large-diameter cylindrical portion 37 slides the small-diameter cylindrical portion 36 so that one of the pair of first pin insertion holes 363 out of the three pairs of small-diameter cylindrical portions 36 is aligned with the position of the second pin insertion hole 371. The small-diameter cylindrical portion 36 is not moved up and down by passing a small-diameter cylindrical portion fixing pin 392 (described later) from one second pin insertion hole 371 to the other second pin insertion hole 371 through the first pin insertion hole 363. Can be fixed. That is, the handle 33 can be fixed at any one of the three upper and lower height positions.

  When the front wheel legs 1, 1 and the rear wheel legs 2, 2 are in the normal closed position, the upper lock pin insertion hole 372 is inserted into the gap 362 by inserting a pin tip portion 652 of a slide lock pin 651 described later. The large diameter cylindrical portion 37 is drilled at a position where the large diameter cylindrical portion 37 is slide-locked. Further, the lower lock pin insertion hole 373 is inserted into the gap 362 when the front end portion 652 of the slide lock pin 651 is inserted when each front wheel leg portion 1 and each rear wheel leg portion 2 are in the normal open position. The large diameter cylindrical portion 37 is pierced at a position where it slides and is locked.

  As shown in FIG. 5, the end portions of both the motion transmission arm members 381 are pivotally supported by a connecting shaft 463 between the first link plate 461 and the second link plate 462. That is, in both the motion transmitting arm members 381, the large-diameter cylindrical portion 37 transmits the vertical movement to the connecting shaft 463 to move the connecting shaft 463 up and down, and the first link pivot shaft as the connecting shaft 463 moves up and down. At the same time, the first link plate 461 is rotated about the third link plate 461, and at the same time, the second link plate 462 is rotated about the second link pivot shaft 24.

  The lower ends of the front wheel leg portions 1 are connected to each other by a first leg connecting portion 14 that extends in the left-right direction between the first and the second. Each front wheel 11 is a caster wheel that can rotate around the axis of the lower end of the front wheel leg 1. Further, the rear wheel leg portions 2 are connected by a second leg connecting portion 23 that extends between the rear wheel legs 2 and 2 in the left-right direction. Each rear wheel 21 is a fixed wheel that cannot rotate about the axis of the lower end of the rear wheel leg 2.

  Then, the left and right front wheel leg portions 1, 1 and the rear wheel leg portions 2, 2 are opened and closed by the rotation of the first link plates 461 and the second link plates 462.

  The large diameter cylindrical portion 37 is provided with a small diameter cylindrical portion fixing member 39 that fixes the small diameter cylindrical portion 36 to the large diameter cylindrical portion 37 in a non-slidable state. As shown in FIG. 8, the small-diameter cylindrical portion fixing member 39 includes a substantially C-shaped member body 391 made of a synthetic resin that is fitted into the large-diameter cylindrical portion 37 while being elastically deformed, and a small-diameter cylindrical portion fixing pin. 392. The small-diameter cylindrical portion fixing member 39 is fitted from the outside while elastically deforming the member main body 391 to the upper end portion of the large-diameter cylindrical portion 37, and the small-diameter cylindrical portion fixing pin 392 is inserted from one second pin insertion hole 371. By passing through the pair of matched first pin insertion holes 363 to the other second pin insertion hole 371, the small diameter cylindrical portion 36 is fixed to the large diameter cylindrical portion 37 in a non-slidable state. Yes.

  The small diameter cylindrical portion fixing member 39 has a cylindrical cap 50 fitted on the outside. That is, the cylindrical cap 50 is loosely fitted to the small diameter cylindrical portion 36 and is pushed down from the upper side of the small diameter cylindrical portion fixing member 39 mounted as described above toward the large diameter cylindrical portion 37, thereby reducing the small diameter cylindrical portion. The fixing member 39 is externally fitted on the member main body 391.

  Further, in the state where the cylindrical cap 50 is fitted on the member main body 391 as described above, the distal end of the small-diameter cylindrical portion fixing pin 392 is engaged with the locking hole 501 provided on the peripheral wall, and the cylindrical cap 50 is moved upward. Withdrawal is prevented. Further, the cylindrical cap 50 functions as an upper lock position restricting protrusion, and each front wheel leg 1 and each rear wheel leg 2 are in a closed state, and a slide lock pin 651 described later is provided. When the pin tip portion 652 and the upper lock pin insertion hole 372 of the large-diameter cylindrical portion 37 coincide with each other, they come into contact with the upper ends of the vertical cylindrical frames 41.

  The left and right vertical cylinder frames 41, 41 are arranged in a state in which the front wheel legs 1 and the rear wheel legs 2 are at the open positions and the front wheels 11 and the rear wheels 21 are installed on a horizontal plane. The inclination of the shaft center and the horizontal plane is provided so as to coincide with the bending angle between the lower end portion of the large diameter cylindrical portion 37 and the vicinity of the midway portion. That is, when the large-diameter cylindrical portion 37 is guided by the left and right vertical cylindrical frames 41, the lower end portion of each large-diameter cylindrical portion 37 slides up and down while maintaining its cylindrical central axis in the vertical direction. Yes.

  Further, both ends of a flat bar 62 bent in a U shape in plan view are fixed to the front extending portions 12 of the left and right front wheel leg portions 1 and 1 with screws (not shown). Both ends of the flat bar 62 are fixed to the inner sides of the front extending portions 12 that face each other on the left and right.

  The luggage storage portion A <b> 2 is formed between each front wheel leg portion 1 and each rear wheel leg portion 2. The shopping basket B is made of a flexible material such as artificial leather or a resin sheet, and is formed in a bag shape that opens upward. The front side portion of the upper edge of the shopping basket B is held at the center in the longitudinal direction of the flat bar 62. Further, a lid member 63 for opening and closing the opening is provided above the shopping basket B. The lid member 63 includes a substantially U-shaped lid support frame 64 in a plan view placed on the front extending portions 12 of the left and right front wheel leg portions 1, 1 and the flat bar 62. The left and right ends of the lid support frame 64 are pivotally supported on the upper part of the support plate 44 at the lower end of the left and right vertical cylinder frames 41 via shafts 442 extending in the left-right direction. In addition, the lid member 63 is also a seat portion, in which a core material made of a plate material such as plywood is covered with a decorative sheet made of a resin sheet or the like.

  10 is an exploded perspective view of the slide lock pin portion of the handcart A, FIG. 11 is a front view of a main part of the upper horizontal cylinder frame 42 of the handcart A, and FIG. 12 is a main part perspective view of the upper horizontal cylinder frame 42 of the handcart A. Each figure is shown. 10 to 12, the upper horizontal cylinder frame 42 includes a pair of left and right slide lock pins 651 and 651, a fixing lever 244, and a pin operation lever 66. The upper horizontal cylinder frame 42 includes a coil spring 425 that urges each slide lock pin 651 outward in the left-right direction. Further, a pair of left and right first long holes 661 and 661 are formed in the upper horizontal cylinder frame 42.

  The fixing lever 244 is fixed to the upper horizontal cylinder frame 42 with screws 67. A pair of left and right second elongated holes 662 and 662 having a substantially C-shape are formed in a cylindrical portion 653 that is rotatably fitted to the upper horizontal cylinder frame 42. The pin operation lever 66 is screwed into the slide lock pin 651 with a screw 663 through the second long hole 662 and the first long hole 661.

  That is, the two slide lock pins 651 and 651 are always urged by the coil spring 425 in the upper horizontal cylinder frame 42 in a direction in which the pin tip 652 protrudes out of the upper horizontal cylinder frame 42.

  When the pin operating lever 66 is pressed in the direction of the fixed lever 244, the screw 663 moves in the direction of the arrow along the first long hole 661 due to the inclination of the second long hole 662, and the slide lock pins 651 and 651 move backward. . As shown by a two-dot chain line in FIG. 6, the pin tip portion 652 enters the upper horizontal cylinder frame 42 side by this retreat, and the lower lock pin insertion hole 373 (or the upper lock pin insertion hole 372) is engaged with the periphery. The large diameter cylindrical portion 37 is slidable in the vertical direction. If the pin tip 652 is in the position of the lower lock pin insertion hole 373 (or the upper lock pin insertion hole 372) in a state where the pressure on the pin operating lever 66 is released, the lower lock pin insertion hole 373 (or The large-diameter cylindrical portion 37 enters the upper lock pin insertion hole 372) to be in the slide lock state.

  Here, the usage method of the handcart A is demonstrated.

  First, the user walks while holding the handle 33 in the use state in which the left and right front wheel leg portions 1, 1 and the left and right rear wheel leg portions 2, 2 shown in FIG.

  Next, the lid or the like is opened for the luggage or the like and stored in the shopping basket B.

  Also, when tired from walking, the brake lever 34 is operated, the front wheel 11 and the rear wheel 21 are locked by the brake 22, and the lid member 63 is closed, so that the lid member 63 is used as a seat. it can.

  In the non-use state, the pin operating lever 66 is pushed to the lower fixing lever 244 side, the left and right slide lock pins 651 and 651 are retracted, and the pin tip portion 652 is inserted into the upper lock pin insertion hole 372. Is released, and the handle 33 is pushed down. Note that the pressing on the pin operation lever 66 is released during the depression.

  By pushing down the handle 33 as described above, the small-diameter cylindrical portion 36 and the large-diameter cylindrical portion 37 are interlocked and pushed downward, and the connecting shaft 463 is vertically pushed down by the action of the left and right motion transmission arm members 381 and 381. . When the connecting shaft 463 is pushed down, the first link plate 461 rotates around the first link pivot shaft 13 so that the connecting shaft 463 side of the first link plate 461 and the second link plate 462 moves downward. The second link plate 462 rotates around the second link pivot shaft 24.

  4, as the first link plate 461 and the second link plate 462 are rotated, the front wheel leg portion 1 is centered on the shaft 441 and the rear wheel leg portion 2 is pivoted on the rear wheel leg portion 2 side. 451 is pivoted to the front wheel leg 1 side to be in the closed leg state.

  When the lower end of the cylindrical cap 50 is pushed down until it hits the upper end of the vertical cylinder frame 41, the pin tip 652 is aligned with the lower lock pin insertion hole 373, and the gap is passed through the lower lock pin insertion hole 373 by the biasing force of the coil spring 425. It enters into 362 and is locked in the closed leg state.

  Further, when switching from the closed leg state to the open leg state, the pin operating lever 66 is pushed to the lower fixing lever 244 side, the slide lock pin 651 is retracted, and the pin tip portion 652 is inserted into the lower lock pin insertion hole 373. Is released and the handle 33 is pulled up. Note that the pressing on the pin operating lever 66 is released during the pulling up.

  By pulling up the handle 33 as described above, the small-diameter cylindrical portion 36 and the large-diameter cylindrical portion 37 are interlocked and pulled upward, and the connecting shaft 463 is pulled vertically by the action of the motion transmitting arm portion 381. When the connecting shaft 463 is pulled up, the first link plate 461 rotates about the first link pivot shaft 13 so that the connecting shaft 463 side of the first link plate 461 and the second link plate 462 moves upward. The second link plate 462 rotates around the second link pivot shaft 24.

  Then, as shown in FIG. 3, the rear wheel leg portion 2 moves away from the rear wheel leg portion 2 around the shaft 441 by the rotation of the first link plate 461 and the second link plate 462. Are pivoted about the shaft 451 in the direction away from the front wheel leg 1 to be in an open leg state.

  When the vertical cylinder frame 41 is pushed up, the pin tip portion 652 coincides with the upper lock pin insertion hole 372 and enters the gap 362 through the upper lock pin insertion hole 372 by the urging force of the coil spring 425 and is locked in the open leg state. Is done.

  In addition, when adjusting the height position of the handle 33 at the open leg position so as to match the height and physical characteristics of the user, the cylindrical cap 50 is slid to the handle 33 side, and the small diameter cylindrical portion fixing member 39 is adjusted. Is exposed to the outside, the member main body 391 is held, the small diameter cylindrical portion fixing pin 392 is pulled out, and the small diameter cylindrical portion 36 is slidable with respect to the large diameter cylindrical portion 37. Then, the small-diameter cylindrical portion 36 is slid with respect to the large-diameter cylindrical portion 37 until any one of the pair of first pin insertion holes 363 where the handle 33 has a desired height is aligned with the second pin insertion hole 371. The small-diameter cylindrical portion fixing member 39 is fixed so that the small-diameter cylindrical portion 36 does not slide again, and the cylindrical cap 50 is pushed down and fitted to the outside of the small-diameter cylindrical portion fixing member 39.

  Next, a method for assembling the handcart A will be described.

  First, when assembling the handcart A, the left and right vertical cylinder frames 41, 41 and a pair of upper and lower upper horizontal cylinder frames 42 extending in the left-right direction and connected between the upper and lower ends of each vertical cylinder frame 41, 41, and A substantially rectangular frame-shaped frame base 4 is previously formed by the lower horizontal cylinder frame 43. Specifically, the left and right ends of the upper horizontal cylinder frame 42 are inserted into the upper cylinder pieces 411 and 411 at the upper end portions of the left and right vertical cylinder frames 41 and 41 and fastened with screws, and the lower ends of the vertical cylinder frames 41 are fixed. The left and right vertical cylinder frames 41, 41, the upper horizontal cylinder frame 42, and the lower horizontal cylinder frame are inserted by inserting the left and right ends of the lower horizontal cylinder frame 43 through the lower cylinder pieces 412 of the section and fixing them with screws. 43, the frame base 4 is formed in advance.

  Next, each handle column 32 is inserted into the frame base 4 formed in advance through the vertical cylinder frames 41 from below, and both ends of the handle frame 3 are attached to the upper ends of the small diameter cylinders 36 respectively protruding from both ends thereof. Fix it.

  Thereafter, the rear ends of the upper end portions of the left and right front wheel leg portions 1 are pivotally supported by the lower portions of the support plates 44 at the lower end portions of the left and right vertical tube frames 41 via shafts 441, respectively. The upper end portion of the rear wheel leg portion 2 is pivotally supported by the support portion 45 at the lower end portion of 41 via a shaft 451.

  About another component member, what is necessary is just to assemble in an appropriate procedure, and an assembly procedure is not limited.

  This wheelbarrow A is as described above, and has the following excellent effects.

  The left and right vertical cylinder frames 41, 41 extend in the left-right direction between the upper and lower ends thereof and are connected to each other as a substantially rectangular frame-shaped frame base 4 by a pair of upper and lower upper horizontal cylinder frames 42 and lower horizontal cylinder frames 43. Since it is formed in advance, the parallelism between the left and right vertical cylinder frames 41 and 41 is ensured in advance. Thereby, the twist between right and left vertical cylinder frames 41 and 41 can be canceled reliably, and the left and right handle column parts 32 and 32 can be smoothly slid in the vertical direction.

  In addition, the rear ends of the upper end portions of the left and right front wheel leg portions 1 are pivotally supported by the frame base 4 via shafts 441 at the lower portions of the support plates 44 at the lower end portions of the vertical cylinder frames 41, respectively. In addition, since the upper end portion of the rear wheel leg portion 2 is pivotally supported by the support portion 45 at the lower end portion of each vertical cylinder frame 41 via the shaft 451, each front wheel leg portion 1 and each rear wheel leg portion 1 is supported. The ring leg portion 2 can be assembled to each vertical cylinder frame 41 with high accuracy.

  In addition, since each vertical cylinder frame 41 is formed in an elliptical cross section that matches the cross sectional shape of each handle column 32 formed in an elliptical cross section, the rotation of each handle column 32 relative to each vertical cylinder frame 41 is performed. Is restricted, and each handle column 32 can be slid more smoothly in the vertical direction.

  Furthermore, both ends of the flat bar 62 that holds the front side portion of the upper edge of the shopping basket B accommodated in the luggage accommodating portion A2 between each front wheel leg portion 1 and each rear wheel leg portion 2 are supported by the rear end of the support plate. 44 is fixed to the front extending portion 12 at the upper end portion of each front wheel leg portion 1 that is supported by the lower portion of the front wheel leg 1 and extends forward, so that the rigidity of the flat bar 62 is increased by the front extending portion 12 of each front wheel leg portion 1. In addition, even if the flat bar 62 is fixed to the inside of the front extending portion 12 facing each other, it can be secured without reducing the size of the luggage storage portion A2.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, the cross-sectional shapes of the small diameter cylindrical portion and the large diameter cylindrical portion are changed. In addition, the structure of those other than a small diameter cylinder part and a large diameter cylinder part is the same as the said embodiment, The same code | symbol is attached | subjected about the same part and the detailed description is abbreviate | omitted.

  That is, as shown in FIG. 13 and FIG. 14, the small-diameter cylindrical portion 71 has a concave portion 711 having an arcuate cross section that is continuous in the axial direction on the wall surface. On the other hand, the large-diameter cylindrical portion 72 is formed in a perfect circular cross section. And the recessed part 711 forms the clearance gap 73 continuous in an axial direction between the inner wall surfaces of the large diameter cylinder part 75. As shown in FIG.

  In FIG. 13, reference numeral 722 denotes one of an upper lock pin insertion hole and a lower lock pin insertion hole. Further, in FIG. 14, 713 is a pair of first pin insertion holes, 721 is a pair of second pin insertion holes, and the pair of second pin insertion holes 721, 721 does not intersect the recess 711 and is large. The upper end of the diameter cylindrical portion 72 is drilled so that the central axis thereof is orthogonal to the central axis of the large diameter cylindrical portion 72.

  The present invention is not limited to the above-described embodiments, and includes various other modifications. For example, in the embodiments described above, the luggage storage portion A2 is provided, but only the seat portion may be provided.

  Moreover, in each said embodiment, although the height of the handle | steering-wheel 33 was made changeable in 3 steps, you may be 4 steps or more.

  Further, in each of the embodiments described above, the flat bar 62 is bent in a U shape in plan view, but the flat bar may be bent in a U shape in plan view.

  Moreover, although the handcart A is used as a silver car in the present embodiment, it may be a handcart such as a shopping car.

A Wheelbarrow A1 Wheelbarrow body A2 Luggage storage (storage space)
B Shopping basket 1 Front wheel leg part 11 Front wheel 12 Front extension part 2 Rear wheel leg part 21 Rear wheel 32 Handle column part 33 Handle 4 Frame base 41 Vertical cylinder frame 42 Upper horizontal cylinder frame (horizontal frame)
43 Lower horizontal cylinder frame (horizontal frame)
44 Support plate (Pivot)
45 Support (Pivot)
62 flat bar

Claims (4)

Left and right front wheel legs that rotatably support the front wheel at the lower end; left and right rear wheel legs that rotatably support the rear wheel at the lower end; and a left and right handle column that supports the handle from below; Each of the front wheel legs can be slidably supported in the vertical direction, and each front wheel leg and each rear wheel leg can be selected between an open leg position in use and a closed leg position in a folded state. And left and right vertical cylinder frames having pivot portions pivotally supporting the upper end portions of the rear wheel leg portions and the rear wheel leg portions, respectively. A wheelbarrow configured to open and close each of the rear wheel legs,
Each of the vertical cylinder frames is formed in advance as a substantially rectangular frame-shaped frame base so as to ensure mutual parallelism by a pair of upper and lower horizontal frames that extend in the left-right direction between the upper and lower ends. And
The handle bases are slidably supported in the vertical direction via the vertical cylinder frames, and the pivot bases at the lower ends of the vertical cylinder frames are supported on the pre-formed frame base. The upper end of each front wheel leg and each rear wheel leg is pivotally supported respectively,
Only the upper horizontal frame of the pair of upper and lower horizontal frames is provided with the handle columns so that the handle columns can slide when the front wheel legs and the rear wheel legs are opened and closed. A handcart having a pin operating lever for releasing the insertion of the slide lock pin from within the upper horizontal frame into the lock pin insertion hole of the upper portion. Each of the handle column parts is formed in an elliptical cross section,
2. The handcart according to claim 1, wherein each vertical cylinder frame is formed in an elliptical cross section that matches a cross sectional shape of each handle column . An accommodation space for accommodating a shopping basket is formed between each front wheel leg and each rear wheel leg.
The upper end portion of each front wheel leg portion has a front extending portion whose rear end is pivotally supported by the pivot supporting portion and extends forward, and the front extending portion includes a front portion of the upper edge of the shopping basket. The barrow according to claim 1 or 2, wherein both ends of a flat bar bent in a U shape or a U shape in a plan view are fixed so as to hold the wheel. Left and right front wheel legs that rotatably support the front wheel at the lower end; left and right rear wheel legs that rotatably support the rear wheel at the lower end; and a left and right handle column that supports the handle from below; Each of the front wheel legs can be slidably supported in the vertical direction, and each front wheel leg and each rear wheel leg can be selected between an open leg position in use and a closed leg position in a folded state. And left and right vertical cylinder frames having pivot portions pivotally supporting the upper end portions of the rear wheel leg portions and the rear wheel leg portions, respectively. A method for assembling a wheelbarrow that opens and closes each of the rear wheel legs,
A substantially rectangular frame-shaped frame base so that the parallelism between the vertical cylinder frames is secured by a pair of upper and lower horizontal frames that extend in the horizontal direction between the upper and lower ends of the vertical cylinder frames. As pre-formed as
The handle column portions are slidably supported in the vertical direction via the vertical cylinder frames on the pre-formed frame base, and the front wheels are supported via the pivot portions at the lower ends of the vertical cylinder frames. The upper end of each leg and each rear wheel leg is pivotably supported,
Each handle column part is slidable when the front wheel leg part and each rear wheel leg part are opened and closed only in the upper horizontal frame of the pair of upper and lower horizontal frames. A method of assembling a handcart, comprising: a pin operating lever for releasing the insertion of the slide lock pin from the upper side frame into the lock pin insertion hole.

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