FOLDING PUSH CART

Abstract

A folding push cart that includes a cart body frame and a storage bag. The front, rear, left, and right vertical surfaces of the cart body frame each includes more than one set of cross-hinged diagonal rods. The bottom of the cart body frame is hinged on the hinge base. The bottom plane of the cart body frame is supported by two left and right folding rod groups, which are hinged on the horizontal slot of the hinge seat on the front and rear vertical surfaces. When opened in place, it can be supported, and it also has a correcting effect on the hinge seat.

Claims

1. A push cart that comprising: a foldable cart body frame (100) and a storage bag (200) sleeved on the cart body frame; the cart body frame (100) has four vertical surfaces: front, rear, left, and right, and a bottom plane; to the front, rear, left, right sides of the four vertical surfaces include a set of diagonal rods (1) that are cross-hinged in the middle; the hinged base (2) is equipped with carters (3), and the front vertical surface of the cart body frame (100) is also provided with a push-pull rod (41) assembly (4); the bottom plane of the cart body frame (100) is supported by two folding rod groups (5) distributed left and right; the folding rod group (5) includes a front rod (51), a rear rod (52) and a bridging piece (53), and the bridging piece (53) is connected to one end of the front rod (51) and the rear rod (52), and the other end of the front rod (51) and the rear rod (52) are correspondingly hinged on the hinge base (2) on the front and rear vertical surfaces, the hinge base (2) is correspondingly formed with a horizontal slot (21); when the cart body frame (100) is opened in place, the front and rear rods (51) (52) are partially lapped in the horizontal slot (21) and are supported.

2. A push cart according to claim 1, wherein: the hinge base (2) is correspondingly formed with a inclined slot (22) at the hinge position where the diagonal rods (1) of the adjacent vertical surface are hinged; the bottom of the inclined slot (22) is provided with a stud (221) at the notch; and when the cart body frame (100) is opened in place, the diagonal rod (1) can be supported by the stud (221).

3. A push cart according to claim 2, wherein: the length of the horizontal slot (21) and the inclined slot (22) on the hinge base (2) is greater than 3 cm, and the slot walls on both sides can form constraints on the corresponding front and rear rods (51) (52) or diagonal rods (1).

4. A push cart according to claim 3, wherein: the casters (3) installed on the two hinge bases (2) on the rear vertical surface are directional casters, the casters are directly locked on the hinge bases (2) through the caster frame (31); the casters (3) installed on the two-hinge base (2) of the front vertical surface are steering casters; the caster frame (31) is positioned on the hinge bases (2) through the rotation shaft (32), and the length of the horizontal slot (21) on the hinge base (2) is between 8 cm and 12 cm.

5. A push cart according to claim 3, wherein: the front and rear rods (51) (52) and diagonal rods (1) are all square-like pipe fittings, at least the two sides used for hinged joints have a planar structure, which can fit and be restrained relative to the two slot walls of the horizontal slot (21) and the inclined slot (22); the bridging piece (53) used to bridge the ends of the front and rear rods (51) (52) is formed into a clamping slot with a connecting part (531) on the upper part, which is clamped on both sides of the ends of the front and rear rods (51) (52) with the aid of the clamping slot, and can be rotated and riveted by rivets; wherein when the rear rod (52) is opened to a horizontal position, its upper part is touched by the connecting part (531), restricting the continued downward movement.

6. A push cart according to claim 1, wherein: the middle of the two diagonal rods (1) on the front vertical surface of the cart body frame (100) are cross-hinged with a plastic part base (6); the plastic part base (6) is formed with a slot hole (61) that is staggered and can pass through the two diagonal rods (1); the diagonal rods (1) partially rest on the bottom of the slot hole (61) to form a restraint and strengthened support, and the plastic part base (6) is also formed with an elastic clamp (62) facing forward, and the push-pull rod (41) assembly (4) is clamped by the elastic clamp (62) to maintain the push-pull rod (41) assembly (4) in an upright state.

7. A push cart according to claim 6, wherein: the push-pull rod (41) assembly (4) includes a pull rod (41) and a slide bushing base (42); the slide bushing base (42) is rotatably positioned on the plastic part base (6) through a riveting shaft (7) and is provided with a retractable waist section (421) corresponding to the elastic clamp (62) of the plastic part base (6); when the push-pull rod (41) assembly (4) swings In the upright state, the elastic clamp (62) can be clamped on the waist section (421) to form a positioning structure. When the pull rod (41) passes through the slide bushing base (42), the lower end is locked with the limit sheath (411), the upper end is bent with a handle (412), the pull rod (41) is pulled up to a designed height, and the limit sheath (411) is in contact with the lower edge of the slide bushing base (42).

8. A push cart according to claim 7, wherein: near the lower end of the pull rod is a bidirectional spring pin (43), which includes a spring (431) that crosses the through hole (413) of the pull rod and a ball pin (432) provided at both ends of the spring; whereby when the pull rod (41) is pulled up to the designed height, the ball pin (432) springs into the pin holes (422) reserved on both sides of the slide bushing base (42) to form a locking structure.

9. A push cart according to claim 8, wherein: the pin hole (422) on the slide bushing base is a penetrating hole, and an unlocking reed (44) is provided on both sides of the slide bushing base (42); the stud (441) on the inner surface of the unlocking reed (44) extends into the pin hole (422); whereby when the unlocking reed (44) is pressed, the stud (441) moves inward and abuts on the ball pin (432) of the bidirectional spring pin, forcing the ball pin (432) to retreat and unlock.

10. A push cart according to claim 1, wherein: the storage bag (200) is set on the cart body frame (100), which means that the upper edge is hung on each hinge point at the upper end of the diagonal rod (1); the lower edge is fixed on the front and rear rods (51) (52), and the bottom is tightened by the folding rod groups (5) on both sides; and a lifting webbing (201) is sewn on the inner bottom of the storage bag (200) at the position of the corresponding bridging piece (53).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 shows a schematic diagram of the folding push cart.

[0023] FIG. 2 shows a zoomed schematic diagram of Selection A from FIG. 1.

[0024] FIG. 3 shows a schematic diagram of the folding push cart body frame.

[0025] FIG. 4 shows a zoomed schematic diagram of Selection B from FIG. 3.

[0026] FIG. 5 shows a zoomed schematic diagram of Selection C from FIG. 3.

[0027] FIG. 6 shows a schematic diagram of the hinge base.

[0028] FIG. 7 shows a schematic diagram of the folding push cart in a collapsed state.

[0029] FIG. 8 shows a schematic diagram of the relationship between the bottom plane of the cart body frame and the push-pull rod assembly.

[0030] FIG. 9 shows a zoomed schematic diagram of Selection D from FIG. 8.

[0031] FIG. 10 shows a partial cross-sectional schematic diagram of the relationship between the pull rod and the slide bushing base.

[0032] FIG. 11 shows a schematic diagram of the relationship between the bottom plane of the cart body frame and the push-pull rod assembly.

[0033] FIG. 12 shows a schematic diagram of the folding rod group.

[0034] FIG. 13 shows a schematic diagram of the folding rod group in a collapsed state.

[0035] Similar reference characters denote corresponding features consistently throughout the attached drawings. Namely, in the drawings the following reference numbers refer to the following part:

TABLE-US-00001 100 Cart body frame 1 Diagonal rod 2 Hinge base 21 Horizontal slot 22 Inclined slot 221 Stud 3 Caster 31 Caster farme 32 Rotation shaft 4 Push-pull rod assembly 41 Pull rod 411 Limit sheath 412 Handle 413 Through hole 42 Slide bushing base 421 retractable waist section 422 Pin hole 43 Bidirectional spring pin 431 Spring 432 Ball pin 44 Unlocking reed 441 Stud 5 Folding rod group 51 Front rod 52 Rear rod 53 Bridging piece 531 Connecting part 532 Chamfer 6 Plastic part base 61 Slot hole 62 Elastic clamp 7 Riveting shaft 200 Storage bag 201 Lifting webbing

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

[0036] Referring now to FIGS. 1, 3, and 7, the folding push cart includes two main parts: a foldable cart body frame 100 and a storage bag 200 that is sleeved outside the cart body frame. The cart body frame 100 has four vertical surfaces: front, rear, left, and right, and a bottom plane, constituting a frame with an opening facing upwards. The front, rear, left, and right sides of the four vertical surfaces include a set of more than one set of diagonal rods 1 that are cross-hinged in the middle. The upper ends of the diagonal rods 1 of adjacent vertical surfaces are hinged to each other, and the lower end is hinged to the hinge base 2, and casters 3 are installed on the hinge base 2, and the push-pull rod assembly 4 is installed on the front vertical surface of the cart body frame 100. The cart body frame 100 is supported by the cross, diagonal bars 1 in the four vertical surfaces, and can be folded together. Generally, the front and rear vertical surfaces of the cart body frame 100 are a set of crossing diagonal bars 1, the left and right vertical surfaces are two sets of crossing diagonal bars 1, and the ends of the two sets of crossing diagonal bars 1 are directly hinged to form a rectangular frame to make it most practical. Of course, one skilled in the art would recognize that it does not rule out the use of three sets of crossing diagonal bars on the left and right sides of the vertical surface, combined into a longer cart body structure, to meet the needs of carrying special products.

[0037] Referring to FIGS. 3, 7, 8, and 11, a uniqueness of this structure is that the bottom plane of the frame 1 is supported by two foldable rod groups 5 distributed left and right. The foldable rod group 5 includes a front rod 51 and a rear rod 52. The bridging piece 53 connects one end of the front rod 51 and the rear rod 52, and the other ends of the front rod 51 and the rear rod 52 are correspondingly hinged on the hinge base 2 on the front and rear vertical surfaces. The hinged base 2 is correspondingly formed with a horizontal slot 21. When the cart body frame 100 is opened in place, the front and rear rods 51 and 52 are partially overlaid in the horizontal slot 21 and supported. In other words, even when the front and rear rods 51 and 52 are not connected by the bridging piece 53, one end can still be maintained in a suspended state by means of a junction point and a local jack. The bridging piece 53 forms an association at the suspension and provides the convenience of lifting up linkage and folding. In other words, the bottom plane of the cart body frame 100 is the restraint mechanism for the frame to open in place. After the two rods of the folding rod group 5 are opened, the bridging end naturally assumes an interference hem to achieve a self-locking state. Only when the bridging end is lifted by an external force can the front and rear rods 51 and 52 draw the front and rear vertical surfaces to collapse and close together.

[0038] As shown in FIG. 6, the hinge base 2 is correspondingly formed with an inclined slot 22 at the hinge position where the diagonal rods 1 of the adjacent vertical are hinged. The bottom of the inclined slot 22 is provided with a stud 221 at the notch. When the cart body frame 100 is opened in place, the diagonal rod 1 can be supported by the stud 221. The reverse also limits the free swing space of the hinge base 2. The stud 221 can also be an inclined bottom, forming a structure with a deep inner and a shallow slot. The stud 221 design is better as it can save material and reduce weight. Furthermore, the length of the horizontal slot 21 and the inclined slot 22 on the hinge base 2 is greater than 3 cm, preferably in the range of 3 cm-15 cm slot length. The groove wall can reach the restraint, which greatly increases the volume and weight of the hinge base. In other words, the slot walls on both sides of the horizontal slot 21 and the inclined slot 22 can form constraints on the corresponding front and rear rods 51 and 52 or the diagonal rod 1. This forms a three-sided constraint with the bottom of the slot, so that the hinge base 2 can gradually correct towards the designed angle. After the cart body frame 100 is opened in place, it can be maintained in the designed state. The angle of the carters 3 remains unchanged, so as to ensure the smooth running of pushing and pulling.

[0039] As shown in FIGS. 3 and 11, in general, the two hinge bases 2 on the rear vertical surface of the cart body frame 100 are equipped with directional casters 3, and the casters 3 are directly locked on the hinge base 2 through the caster frame 31. The casters 3 installed on the two-hinge base 2 of the front vertical surface are steering casters. The caster frame 31 is positioned on the hinge base 2 through the rotation shaft 32, so that the casters 3 and the caster frame 31 can rotate freely relative to the hinge base 2 to meet the requirements of the steering of the push cart. Correspondingly, the length of the horizontal slot 21 on the hinge base 2 where the steering casters are located is between 8 cm and 12 cm, which strengthens the guiding effect of the hinge base 2 and enhances its stability. Similarly, if the steering casters 3 are provided on the rear vertical surface of the cart body frame 100, the hinge base with the steering casters will also lengthen the horizontal slot 21.

[0040] In order to strengthen the binding force between the horizontal slot 21 and the inclined slot 22 of the hinge base 2 and the rods, a restriction is also made on the rods, the traditional circular rods are not excluded. However, the following examples of rods are better.

[0041] As shown in FIGS. 3, 7, 8 and 11, the front and rear rods 51 and 52 and the diagonal rod 1 are all square-like pipe fittings, such as standard rectangular profiles. The two slot walls of the horizontal slot 21 and the inclined slot 22 are relatively fit and constrained, that is, they further eliminate the movement gap. They are used to bridge the bridging pieces at the ends of the front and rear rods 51 and 52 and are formed as a clamping slot with a connecting part 531 on the upper part. They are clamped on both sides of the ends of the front and rear rods 51 and 52 with the aid of the clamping slot, and can be rotated and riveted by rivets. The rear rod 52 is opened to a horizontal position, and its upper part is stopped by the connecting part 531 to restrict continued downward movement. One of the advantages is maintaining the integrity of the bridging piece 53 to facilitate assembly. The second advantage is that the connecting part 531 additionally restricts the downward swing of the end of the rear rod 52. The third advantage is that the horizontal slot 21 matched with the rear rod 53 can be designed to be shorter. In order to strengthen the bridging piece 53, a chamfer 532 is punched on the four edges. In addition, the bridging piece can also directly adopt two symmetrical clips, which are directly clamped on both sides of the rod and riveted. However, the restraint on the rear rod 52 will be lost. In this structure, a longer horizontal slot 21 is required to constrain the rear rod 52.

[0042] As shown in the embodiment of FIG. 11, the bridging piece 53 is rotatable and riveted by rivets. In particular, the front rod 51 can be directly riveted into a single body, which can reduce the movement gap caused by the movable riveting and can strengthen the binding effect of the connection part 531 to the rear rod 52. In addition, the lower side of the end of the front rod 51 or the rear rod can be processed into a slope to provide folding space. In addition to riveting, the bridging piece 53 and the front rod 51 can be welded together, as shown in FIGS. 12 and 13, to further improve the rigidity and strength of the folding rod group 5. The structure is simpler and is more convenient to assemble.

[0043] As shown in Figure s1, 8 and 11, the middle of the two diagonal rods 1 on the front vertical surface of the cart body frame 100 are cross-hinged with a plastic base 6. The plastic base 6 is formed with staggered slots 61 for the two diagonal rods to pass through. When the two diagonal rods 1 are opened to the designed angle, the diagonal rods 1 partially abut at the bottom of the slot 61 to form a restraint and strengthened support, which can also relieve the stress on the hinge point. The plastic base 6 is also formed with an elastic clamp 62 toward the front. With the help of the elastic clamp 62, the push-pull rod assembly 4 is clamped to maintain the push-pull rod assembly 4 in an upright state, which is another key point of the present application.

[0044] The push-pull rod assembly 4 includes a pull rod 41 and a slide bushing base 42. The slide bushing base 42 is rotatably positioned on the plastic part base 6 by a riveting shaft 7 and is provided with a retractable waist section 421 corresponding to the elastic clamp 62 of the plastic part base. When the push-pull rod assembly 4 swings to an upright state, the elastic clamp 62 can be clamped at the retractable waist section 421 to form a positioning structure. When the pull rod 41 passes through the slide bushing base 42, the lower end is locked with the limit sheath 411, the upper end is bent with a handle 412, the pull rod 41 is pulled up to a designed height, and the limit sheath 411 is in contact with the lower edge of the slide bushing base 42 to form a pulling force transmission effect. When the push cart is pulled, the pull rod 41 is forced forward, and the slide bushing base 42 is free from the restriction of the clamp 62. Clamp 62 can cater to the force angle around the riveting shaft 7. After releasing the grip of the handle, the pull rod 41 swings freely. One option is to follow the slide bushing 42 and slide down, letting the limit sheath 411 fall to the ground. This state is quite special. The second option is that the pull rod 41 drives the slide bushing base 42 to swing around the riveting shaft 7 under the action of gravity until the limit sheath 411 touches the bottom of the plastic part base 6, keeping the handle 412 in the upturned state, as shown in FIG. 1, to facilitate the need for secondary pulling.

[0045] Furthermore, near the lower end of the pull rod 41 is a bidirectional spring pin 13, which includes a spring 431 that crosses the through hole 413 of the pull rod and a ball pin 432 provided at both ends of the spring. When the pull rod 41 is pulled up to the designed height, the ball pin 432 springs into the pinholes 422 reserved on both sides of the slide bushing base 42 to form a locking structure. It is locked on the pull rod 41 at the designed height, which is convenient for re-use. In addition, the locking also allows the pull rod 41 to be used for pushing actions.

[0046] There are two functions of the bidirectional spring pin 43. One for general positioning. When the component force on the ball pin is greater than the spring force, it will automatically unlock. The other function is when the ball pin springs deeper, it needs to be manually unlocked. To do this, an unlocking device needs to be set. In this example, the pinhole 422 on the slide bushing base is a penetrating hole, and an unlocking reed 44 is provided on both sides of the slide bushing seat 42. The stud 441 on the inner surface of the unlocking reed 44 extends into the pin hole 422. When the unlocking reed 44 is pressed, the stud 441 moves inward and abuts on the ball pin 432 of the bidirectional spring pin, forcing the ball pin 432 to retreat and unlock. With the latter locking method, the pull rod 41 can use the diagonally backward thrust to push the push cart forward. Also because the ball pin 432 is relatively protruding, it is easy to be stuck on the lower edge of the slide bushing base 42. The entrance of the lower edge of the slide bushing base 42 is designed as a trumpet mouth or a corresponding inclined surface 423, and the inclined surface 423 is used to force the ball pin 432 to retract, as shown in FIG. 10.

[0047] Refer to FIG. 1, the storage bag 200 is arranged on the cart body frame 100, which means that the upper edge is hung on the hinge points of the upper end of the diagonal rod 1, and the lower edge is fixed on the front and rear rods 51 and 52. The bottom is tightened by the folding rod groups 5 on both sides, and the hinge points at the upper ends of the folding rod groups 5 and the diagonal rod 1 provide load-bearing needs. Compared with the traditional technology, the bottom of the frame is supported by cross-folding rods. It is flatter than the bottom, and there is no cross-rod support in the middle. A lifting webbing 201 is sewn on the inner bottom of the storage bag at the position of the corresponding bridge 53. When folding, only the lifting webbing 201 needs to be lifted up, and the diagonal rods will be brought together.

[0048] While this invention has been described as having a preferred design, it is understood that it is capable of further modifications, uses and/or adaptations of the invention following in general the principle of the invention and including such departures from the present disclosure as come within the known or customary practice in the art to which the invention pertains and as maybe applied to the central features hereinbefore set forth, and fall within the scope of the invention and the limits of the appended claims. It is therefore to be understood that the present invention is not limited to the sole embodiment described above, but encompasses any and all embodiments within the scope of the following claims.