Foldable trolley frame

Abstract

The invention discloses a foldable trolley frame. The foldable trolley frame comprises two frames, two side crossing mechanisms and a bottom frame component. The frame comprises a bottom piece and two telescopic rods. The side crossing mechanism comprises at least two shear type units which are hinged end to end, and the inner lower ends of the shear type units are hinged to form a lower hinged part. Lower hinge parts corresponding to the cross mechanisms on the two sides are connected with lower cross rods. The bottom frame component comprises two bottom frames, the inner sides of the two bottom frames are hinged together, the outer sides of the two bottom frames are hinged to the two frames respectively, and the bottom frame component in the opening state is supported on the lower cross rod. The side crossing mechanism is provided with two outer lower ends and two outer upper ends, the outer lower ends of the side crossing mechanism are hinged to the bottom piece or the lower rod of the frame, the outer upper ends of the side crossing mechanism and the upper rod are rotatably connected, and the rotating axis is located over the telescopic rod or penetrates through the upper rod. The folding device has the advantages that connecting rods in the background art are saved, the production cost is reduced, and the hand clamping risk during folding is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of handcart technology, and more particularly to a foldable handcart frame. Background Technology

[0002] Existing handcart frames, such as US8011686B2, include folding frames with folded and open states. The folding frame includes two vertically spaced frames arranged front to back, two side-crossing mechanisms arranged left to right, and a base frame assembly. Each frame includes a base rod and two lower rods fixed to the base rod. The base frame assembly includes two end-to-end hinged base frames, with the outer sides of each base frame rotatably connected to the lower parts of the two lower rods. A side-crossing mechanism connects the lower rods on the same side of the two frames; the side-crossing mechanism includes two end-to-end scissor units, with their inner ends hinged together (two inner upper ends hinged, two inner lower ends hinged), and a lower crossbar connected to the hinged inner lower ends. The two outer lower ends of the side-crossing mechanism are respectively hinged to the lower parts of the two lower rods of the frame, and upper crossbars are fixed to the two outer upper ends. Additional first and second links are provided: the inner end of the first link is rotatably connected to the upper part of the side cross mechanism, and the middle part is rotatably connected to the upper part of the lower link. The outer end of the first link extends to form a pull part for the user to pull, thus enabling the lower link, the first link, and the first scissor unit to cooperate to form a first four-bar linkage; the inner end of the second link is rotatably connected to the upper part of the side cross mechanism, and the outer end is rotatably connected to the upper part of the lower link, thus enabling the lower link, the second link, and the second scissor unit to cooperate to form a second four-bar linkage; the two four-bar linkages are linked. The two frames are separated, and the two upper crossbars are supported by the first and second links respectively. The hinge of the two base frames is supported by the lower crossbar, and the folding frame is in the open state. Adding the first and second links increases the number of links, increases costs, and poses a potential safety hazard to the user as it is easy to pinch their hands. Summary of the Invention

[0003] The present invention provides a foldable handcart frame that overcomes the shortcomings of handcart frames in the prior art.

[0004] The technical solution adopted by this invention to solve its technical problem is: a foldable handcart frame, comprising two frames, two side crossing mechanisms, and a base frame component; the two frames are spaced apart along a first direction, and each frame includes a base and two telescopic rods, each telescopic rod having a lower rod and an upper rod, the lower rod being fixed to the base; the telescopic rods on the same side of the two frames are connected by a side crossing mechanism, and the two side crossing mechanisms are spaced apart along a second direction, the second direction being perpendicular to the first direction; the side crossing mechanism includes at least two scissor units, the at least two scissor units being hinged end-to-end and with their inner lower ends... The hinge is a lower hinge part; the lower hinge parts corresponding to the two side cross mechanisms are connected to a lower crossbar; the base frame component includes two base frames, the two base frames are hinged on the inner side and can change between an open state and a folded state, the two base frames are respectively hinged on the two frames on the outer side, and the base frame component in the open state rests on the lower crossbar; the characteristic is that: the side cross mechanism has two outer lower ends and two outer upper ends, the outer lower ends of the side cross mechanism are hinged to the bottom part of the frame or the lower rod, the outer upper ends of the side cross mechanism and the upper rod form a rotatable connection and the rotation axis is located directly above the telescopic rod or passes through the upper rod.

[0005] The top of the upper rod is fixed with a base, and the base has a connecting hole that extends through in the second direction. The upper ends of the two side cross mechanisms are connected to an upper cross bar, which is connected in the connecting hole and located directly above the telescopic rod, so that the upper ends of the side cross mechanisms and the upper rod can be rotatably connected.

[0006] The upper crossbar is rotatably connected in the connecting hole, and the upper crossbar is fixed between the upper ends of the two side cross mechanisms.

[0007] The upper crossbar is fixed inside the connecting hole and both ends of the upper crossbar extend out of the connecting hole. A rotating sleeve is fixed at the end of the upper crossbar, and the rotating sleeve can be rotatably sleeved at the end of the upper crossbar.

[0008] The upper crossbar is rotatably connected to the connecting hole and both ends of the upper crossbar extend out of the connecting hole. A rotating sleeve is fixed at the end of the upper crossbar, and the rotating sleeve is rotatably sleeved on the end of the upper crossbar.

[0009] Assume that the first pivot passes through the lower outer end of the side cross mechanism, the lower rod, and the base to hinge the side cross mechanism and the frame, and hinge the frame and the base.

[0010] The lower ends of the base frame and the side cross mechanism are respectively located inside and outside the lower rod, and the first pivot is connected to the bottom of the lower rod.

[0011] The lower crossbar has a second pivot protruding from both ends. The second pivot passes through the lower end of the two scissor units and is hinged to the lower end of the two scissor units.

[0012] The scissor unit of the side cross mechanism is provided in two parts, with the hinge joints on the inner sides of the two base frames in the open state resting against the lower crossbar.

[0013] The base frame is fixedly provided with a mounting part, and the mounting part is connected to casters; one of the two frames is connected to a handle assembly.

[0014] Compared with the prior art, this technical solution has the following advantages:

[0015] The lower end of the side-crossing mechanism is hinged to the bottom part or lower rod of the frame, and the upper end of the side-crossing mechanism and the upper rod form a rotatable connection. The lower rod and the upper rod form a telescopic connection. Firstly, it saves the first and second connecting rods of the prior art, reduces production costs, and effectively avoids the risk of pinching hands when folding. Secondly, the telescopic rod is kept at its minimum length to achieve a limit and maintain the open state, ensuring stability and reliability. Thirdly, the rotation axis of the upper end of the side-crossing mechanism and the upper rod is located directly above the telescopic rod or passes through the upper rod, so that the two frames are close together after folding, the volume is smaller after folding, and the packaging and transportation costs are reduced. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is one of the three-dimensional schematic diagrams of the handcart frame in a specific embodiment, showing it in an open state;

[0018] Figure 2 This is the second three-dimensional schematic diagram of the handcart frame in a specific implementation method, showing it in a semi-folded state;

[0019] Figure 3 This is the third perspective view of the handcart frame in the specific implementation method, in a folded state;

[0020] Figure 4 yes Figure 2 A magnified view of part A;

[0021] Figure 5 This is one of the three-dimensional schematic diagrams of the handcart frame in a specific embodiment, showing it in an open state;

[0022] Figure 6 This is the second perspective view of the handcart frame in the specific implementation method, showing it in the first half-folded state;

[0023] Figure 7 This is the third perspective view of the handcart frame in the specific implementation method, showing it in the second half-folded state;

[0024] Figure 8 This is the fourth perspective view of the handcart frame in the specific implementation method, showing it in the third half-folded state;

[0025] Figure 9 This is a three-dimensional schematic diagram of the framework of a specific implementation method;

[0026] Figure 10 This is a three-dimensional schematic diagram of the framework and handle assembly of the specific implementation method;

[0027] Figure 11 This is a three-dimensional schematic diagram of the side crossing mechanism in a specific implementation method;

[0028] Figure 12 This is one of the perspective views of the base frame component in a specific embodiment, in an open state;

[0029] Figure 13 This is the second perspective view of the base frame component in the specific implementation method, which is in a semi-folded state;

[0030] Figure 14 This is the third perspective view of the base frame component in the specific implementation method, which is in a folded state.

[0031] Label Explanation:

[0032] Frame 1, base 11, lower rod 12, upper rod 13, fixed base 14, connecting hole 15, first pivot 16; side cross mechanism 2, scissor unit 21, lower hinge 22, lower crossbar 23, upper crossbar 24, swivel sleeve 25, second pivot 26; base frame component 3, base frame 31; casters 4, handle assembly 5. Detailed Implementation

[0033] Please refer to Figures 1 to 14 The foldable handcart frame includes two frames 1, two side crossing mechanisms 2, and a base frame component 3.

[0034] The frame 1 includes a base 11 and two telescopic rods. Each telescopic rod has a lower rod 12 and an upper rod 13. The upper rod 13 is slidably connected to the lower rod 12, thus the lower rod 12 and the upper rod 13 cooperate to form a telescopic rod. In this embodiment, it is a two-section telescopic rod, but three-section or four-section telescopic rods can also be provided as needed. The base 11 is fixedly connected between the lower ends of the lower rods 12 of the two telescopic rods. A base 14 is fixedly provided at the top of the upper rod 13. The base 14 has a connecting hole 15 that extends through the front and rear direction and is located directly above the upper rod 13.

[0035] The two frames 1 are spaced apart along a first direction, which is the left-right direction. A side-crossing mechanism 2 connects the telescopic rods on the same side of the two frames 1, and the two side-crossing mechanisms 2 are spaced apart along a second direction, which is the front-back direction. The side-crossing mechanism 2 includes at least two scissor units 21, which are hinged end-to-end, with the lower inner hinge being a lower hinge portion 22. The lower hinge portion 22 of the two side-crossing mechanisms 2 is connected to a lower crossbar 23. The scissor unit 21 is also called a scissor-shaped linkage group, which is a commonly used linkage in the art consisting of two rods pivotally connected together in the middle. An upper crossbar 24 is connected to the upper outer end of the two side-crossing mechanisms 2. The upper crossbar 24 passes through the connecting hole 15 of the fixed seat 14 of the two upper rods 13 of the frame 1 and is located directly above the telescopic rod, so that the upper outer end of the side-crossing mechanism and the upper rod 13 form a rotatable connection.

[0036] The base frame component 3 includes two base frames 31, which are hinged together on their inner sides and can change between an open state and a folded state. The outer sides of the two base frames 31 are respectively hinged to the lower rods 12 of the two frames 1. The base frame component 3 in the open state rests against the lower crossbar 23.

[0037] The side crossing mechanism 2 has two lower outer ends and two upper outer ends. The lower outer ends of the side crossing mechanism 2 are hinged to the lower part of the lower rod 12 of the frame 1. The upper outer ends of the side crossing mechanism 2 and the upper rod 13 are rotatably connected, and the axis of rotation is located directly above the upper rod 13. In the specific structure: the upper crossbar 24 is fixed between the upper outer ends of the two side cross mechanisms 2, and the upper crossbar 24 can be rotatably connected in the connecting hole 15. The rotation axis of the upper outer end of the side cross mechanism 2 and the upper rod 13 is the axis of the upper crossbar 24 itself; or, the upper crossbar 24 is fixed in the connecting hole 15 and both ends of the upper crossbar 24 extend out of the connecting hole 15. A rotating sleeve 25 is fixed at the end of the upper crossbar 24, and the rotating sleeve 25 can be rotatably sleeved at the end of the upper crossbar 24. The rotation axis of the upper outer end of the side cross mechanism 2 and the upper rod 13 is the axis of the upper crossbar 24 itself; or, the upper crossbar 24 can be rotatably connected in the connecting hole 15 and both ends of the upper crossbar 24 extend out of the connecting hole 15. A rotating sleeve 25 is fixed at the end of the upper crossbar 24, and the rotating sleeve 25 can be rotatably sleeved at the end of the upper crossbar 24. The rotation axes of the two coincide and are the axis of the upper crossbar 24 itself. The upper and lower outer ends of the side cross mechanism 2 are connected to the lower rod 12 and the upper rod 13 respectively. The lower rod 12 and the upper rod 13 are slidably connected, thereby saving the front and rear connecting rods in the prior art, avoiding hand pinching, and eliminating safety hazards. The telescopic rod is kept at its minimum length to achieve the limit and maintain the open state, ensuring stability and reliability. The rotation axis is located directly above the upper rod 13, saving the increased space occupied due to the deviation of the rotation axis and the telescopic rod.

[0038] The first pivot 16 passes through the lower outer end of the side crossing mechanism 2, the lower rod 12, and the base frame 31 to hingely connect the side crossing mechanism 2 and the frame 1, and to hingely connect the frame 1 and the base frame 31, so that their hinge axes coincide. A single pivot achieves two hinged connections, reducing the space occupied. In the specific structure: the base frame 31 and the lower outer end of the side crossing mechanism 2 are respectively located inside and outside the lower rod 12, with the side crossing rod group on the outside and the base frame on the inside, which can be stored between the two telescopic rods. The layout is reasonable and avoids interference. The first pivot 16 is connected to the bottom of the lower rod 12 and is slightly higher than the base rod 11. The first pivot 16 is a pin, rivet, or bolt mechanism.

[0039] The lower crossbar 23 has a second pivot 26 protruding from both ends. The second pivot 26 passes through the lower end of the two scissor units 21 and is hinged to the lower end of the two scissor units 21 to form a lower hinge part 22. The lower crossbar 23 not only supports the base frame component 3 in the open state, but also hinges the lower end of the two scissor units 21.

[0040] In this embodiment, the side cross mechanism 2 has two scissor units 21. The hinged joints on the inner sides of the two open base frames 31 rest against the lower crossbars 23 to support the base frame component 3. Depending on the needs, the number of scissor units 21 can be three. The inner ends of the three scissor units 21 are sequentially hinged, and the lower hinged joints 22 of every two adjacent scissor units 21 are connected to the lower crossbars 23. The three scissor units 21 have two lower crossbars 23. The base frame component in the open state rests against the two lower crossbars 23.

[0041] The opening process of the handcart frame in this embodiment: Please refer to... Figure 3 , Figure 2 , Figure 1 ,or, Figure 8 , Figure 7 , Figure 6 and Figure 5 The two frames 1 are moved apart to open the side cross mechanism 2, retract the telescopic rod, and open the two base frames 31. When the telescopic rod is at its minimum length, the two base frames 31 of the base frame component 3 are at their maximum unfolded angle and rest against the lower crossbar 23. At this time, the handcart frame is in the open state. For the folding process, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 ,or, Figure 5 , Figure 6 , Figure 7 and Figure 8 Lift the middle part of the base frame component 3 (the hinge of the two base frames 31) to drive the two base frames 31 to fold upwards, so as to bring the two frames 1 closer together, extend the telescopic rod, and fold the side cross mechanism 2. When the two frames 1 are close together, the handcart frame is in the folded state.

[0042] The bottom rod 11 of the frame 1 is fixed with two mounting parts. The mounting parts are provided with through holes. Casters 4 are installed in the through holes of the mounting parts. The structure of the mounting parts and casters 4 can refer to the casters of the prior art. A handle assembly 5 is installed on the bottom rod 11 of one of the two frames 1. The structure of the handle assembly 5 can refer to the casters of the prior art.

[0043] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A foldable handcart frame, comprising two frames, two side crossing mechanisms, and a base frame component; the two frames are spaced apart along a first direction and each frame includes a base and two telescopic rods, each telescopic rod having a lower rod and an upper rod, the lower rod being fixed to the base; the telescopic rods on the same side of the two frames are connected by a side crossing mechanism, and the two side crossing mechanisms are spaced apart along a second direction, the second direction being perpendicular to the first direction; the side crossing mechanism includes at least two scissor units, the at least two scissor units being hinged end-to-end, with the lower inner hinge being a lower hinge portion; the lower hinge portions corresponding to the two side crossing mechanisms are connected to a lower crossbar; the base frame component includes two base frames, the two base frames being hinged on their inner sides and capable of changing between an open state and a folded state, the two base frames being hinged on their outer sides to the two frames respectively, and the base frame component in the open state resting against the lower crossbar; characterized in that: The side crossing mechanism has two lower outer ends and two upper outer ends. The lower outer ends of the side crossing mechanism are hinged to the bottom part or lower rod of the frame. The upper outer ends of the side crossing mechanism and the upper rod are rotatably connected, and the axis of rotation is located directly above the telescopic rod or passes through the upper rod.

2. The foldable handcart frame according to claim 1, characterized in that: The top of the upper rod is fixed with a base, and the base has a connecting hole that extends through in the second direction. The upper ends of the two side cross mechanisms are connected to an upper cross bar, which is connected in the connecting hole and located directly above the telescopic rod, so that the upper ends of the side cross mechanisms and the upper rod can be rotatably connected.

3. The foldable handcart frame according to claim 2, characterized in that: The upper crossbar is rotatably connected in the connecting hole, and the upper crossbar is fixed between the upper ends of the two side cross mechanisms.

4. The foldable handcart frame according to claim 2, characterized in that: The upper crossbar is fixed inside the connecting hole and both ends of the upper crossbar extend out of the connecting hole. A rotating sleeve is fixed at the end of the upper crossbar, and the rotating sleeve can be rotatably sleeved at the end of the upper crossbar.

5. The foldable handcart frame according to claim 2, characterized in that: The upper crossbar is rotatably connected to the connecting hole and both ends of the upper crossbar extend out of the connecting hole. A rotating sleeve is fixed at the end of the upper crossbar, and the rotating sleeve is rotatably sleeved on the end of the upper crossbar.

6. The foldable handcart frame according to claim 1, characterized in that: Assume that the first pivot passes through the lower outer end of the side cross mechanism, the lower rod, and the base to hinge the side cross mechanism and the frame, and hinge the frame and the base.

7. The foldable handcart frame according to claim 6, characterized in that: The lower ends of the base frame and the side cross mechanism are respectively located inside and outside the lower rod, and the first pivot is connected to the bottom of the lower rod.

8. The foldable handcart frame according to claim 1, characterized in that: The lower crossbar has a second pivot protruding from both ends. The second pivot passes through the lower end of the two scissor units and is hinged to the lower end of the two scissor units.

9. The foldable handcart frame according to any one of claims 1 to 8, characterized in that: The scissor unit of the side cross mechanism is provided in two parts, with the hinge joints on the inner sides of the two base frames in the open state resting against the lower crossbar.

10. The foldable handcart frame according to any one of claims 1 to 8, characterized in that: The base frame is fixedly provided with a mounting part, and the mounting part is connected to casters; one of the two frames is connected to a handle assembly.

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