A hand trolley pull rod structure

Abstract

The application discloses a kind of gathering trolley pull rod structure, belongs to trolley technical field.Mainly including frame assembly, frame assembly has bottom right block;Wheel assembly;Handlebar assembly, the handlebar assembly includes hinged block on bottom right block, hinged block is hinged with connecting rod;Telescopic rod is slidably inserted in connecting rod inside;Hinge on telescopic rod on the junction block;Lower handle is slidably inserted in the junction block;And upper handle is slidably inserted in lower handle inside;Connecting rod is provided with bolt, and long waist slot is formed in telescopic rod.The application of a kind of gathering trolley pull rod structure, by being provided with the handlebar assembly that can be completely folded, can make that trolley is stored, handlebar assembly is completely stored, and is adhered to the side of trolley, to further reduce the space occupied by trolley, simultaneously by being provided with wheel assembly, so that wheel can be detached when trolley gathers, trolley is not elevated completely, to make that trolley floor space is smaller.

Description

Technical Field

[0001] This application relates to the field of handcart technology, specifically a handcart lever structure. Background Technology

[0002] A handcart is a transport vehicle that is pushed and pulled by human power. It is the ancestor of all vehicles. Although the material handling technology of handcarts has been continuously developed, handcarts are still used as an indispensable transport tool. Handcarts are widely used in production and daily life because they are inexpensive, easy to maintain, convenient to operate, and lightweight. They can work in places where motor vehicles are inconvenient to use and are very convenient for transporting lighter items over short distances.

[0003] For example, the patent with announcement number CN 117842156B specifically discloses a folding structure for a handcart. This patent has an adjustment mechanism that allows the width of the handcart to be easily adjusted when it travels through narrow alleys, so that the handcart can pass through easily. At the same time, the adjustment mechanism has a locking function to adapt to different alley widths.

[0004] However, when folding and storing the stroller, only the stroller body can be folded, while the handle cannot be adjusted. As a result, the long handle takes up a lot of space, which makes the folding effect of the stroller poor and sometimes affects the overall storage of the stroller. Therefore, it is necessary to provide a stroller handle structure that can be brought together to solve the above problems.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide a folding trolley handle structure that solves the problem that existing trolley handles are not easy to fold and store.

[0007] The technical solution adopted by this application to solve its technical problem is: a trolley pull rod structure, including a frame assembly that provides support for the trolley, the frame assembly having a bottom right block; a wheel assembly that is detachably installed at the bottom of the frame assembly; a handle assembly including a hinge block hinged to the bottom right block, a connecting rod hinged to the hinge block; a telescopic rod slidably inserted inside the connecting rod; a junction block hinged to the telescopic rod; a lower handle slidably inserted into the junction block; and an upper handle slidably inserted inside the lower handle; a pin is provided through the connecting rod, and an elongated groove is provided on the telescopic rod.

[0008] Furthermore, a top plug is fixedly installed at the upper end of the pull handle, and a bottom plug is fixedly installed at the bottom end of the pull handle. A pin hole is provided on the bottom plug, and an elastic body is fixedly installed inside the pin hole. A ball is fixedly installed on the elastic body.

[0009] Furthermore, a pressing part is slidably provided on the upper inner end of the upper handle, a through rod is fixedly installed on the bottom of the pressing part, a drive sleeve is fixedly installed on the bottom of the through rod, and two sets of inclined blocks are provided on the bottom of the drive sleeve. The two sets of inclined blocks are arranged in a vertically downward direction, with their opposing surfaces far apart from each other.

[0010] Furthermore, a middle plug is fixedly installed at the upper end of the lower handle, and two sets of sliders slide horizontally on the upper end of the middle plug. A second spring is fixedly installed between the two sets of sliders, and notches are provided on both sides of the upper handle.

[0011] Furthermore, the slider is provided with a transition ramp, which is adapted to the inclined block; a first spring is installed between the middle plug and the drive sleeve.

[0012] Furthermore, the frame assembly includes four sets of side uprights, each with a top block fixedly mounted on its upper end and a middle block slidably disposed in the middle of the side upright; an upper side rod hinged to the top block; a lower side rod hinged to the middle block, the lower side rod being hinged to the upper side rod at the middle position; a middle rod group having two sets of middle rods hinged to each other, the middle rod group being hinged to the upper side rod and the lower side rod respectively, the two sets of middle rods being hinged at the middle position and forming a second hinge point; a bottom left block hinged to the bottom of one side upright; a bottom right block hinged to the bottom of the other side upright; and two bottom rod groups hinged to the bottom left block and the bottom right block respectively, the other end of the bottom rod group being hinged to a bottom side block.

[0013] Furthermore, the wheel assembly includes a lower inner rod installed at the bottom of the side upright, the lower inner rod having a through-hole groove along its length, the groove being square, and an insert rod slidably disposed inside the groove; a wheel frame is mounted on the bottom bearing of the insert rod, and a wheel is mounted on the wheel frame.

[0014] Furthermore, the lower inner rod is provided with a slot with a side opening at the upper end of the mating groove, and a plug is inserted into the slot. A horizontal sliding groove is provided at the upper end of the slot, and a boss is provided on the side of the plug. The side of the side rod is provided with a insertion hole, and the bottom of the plug is provided with a receiving groove. An elastic body is installed between the plug and the slot. The elastic body is adapted to push the plug out of the insertion hole in the initial state, and when pressed, it is adapted to drive the plug into the interior of the insertion hole. The upper end of the plug rod is provided with a plug, which is adapted to the receiving groove. The bottom of the receiving groove is provided with a step.

[0015] Furthermore, an extension assembly is installed on the bottom left block. The extension assembly includes a crossbar hinged to the bottom left block, the crossbar being arranged along a direction perpendicular to the forward movement of the trolley, and a cross block being hinged between two sets of the crossbars. An extension rod is hinged to the bottom left block along the forward movement of the trolley, and the extension rod is adapted to rotate in the vertical direction. An end block is provided at the end of the extension rod, and an extension block is slidably provided at the middle position of the extension rod. A first folding rod is hinged to the end block, and a second folding rod is hinged to the extension block. The two sets of first folding rods are hinged to each other at the other end, and the first folding rod and the second folding rod are hinged to each other at the middle position.

[0016] Furthermore, a pull rod assembly is installed between the bottom edge block and the second hinge point. The pull rod assembly includes an upper pull rod fixedly installed at the second hinge point and a lower pull rod fixedly installed at the bottom edge block. Both the upper pull rod and the lower pull rod are vertically arranged, and the upper pull rod has a pull rod groove with an opening at the bottom end inside.

[0017] The pull rod has a vertical groove, and the pull rod has a pin fixedly installed on it.

[0018] The beneficial effects of this application are: the handcart pull rod structure provided by this application has the following...

[0019] Beneficial effects:

[0020] 1. By incorporating a fully foldable handle assembly, the handle assembly can be completely folded away and fitted to the side of the stroller when stored, thereby further reducing the space occupied by the stroller.

[0021] 2. By incorporating wheel components, the wheels can be easily removed from the trolley, enabling quick wheel removal. Additionally, the trolley can be folded up to achieve a smaller volume, resulting in a smaller trolley size during packaging.

[0022] 3. By incorporating foldable and expandable extension components, the trolley can be easily folded and stored, and can also be extended in length to facilitate the transport of longer goods.

[0023] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0025] In the attached diagram:

[0026] Figure 1 This is a schematic diagram of a folding handcart lever structure according to this application. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of a folding handcart lever structure according to this application. Figure 2 ;

[0028] Figure 3 for Figure 2 A partial structural diagram at point A in the middle;

[0029] Figure 4 for Figure 3 A partial structural diagram of the lower inner rod and the insert block;

[0030] Figure 5 for Figure 1 Schematic diagram of the tie rod assembly;

[0031] Figure 6 for Figure 5 Cross-sectional view of the tie rod assembly;

[0032] Figure 7 for Figure 6 A schematic diagram of the partial structure at point B in the middle;

[0033] Figure 8 for Figure 6 A schematic diagram of the partial structure at point C in the middle;

[0034] Figure 9 for Figure 6 A schematic diagram of the partial structure at point D;

[0035] Figure 10 for Figure 8 Another schematic diagram of the structure;

[0036] Figure 11This is a schematic diagram of the rear door structure of a folding handcart lever structure in this application;

[0037] The following are the labeling elements in the figure:

[0038] 1. Frame assembly; 11. Top rod; 12. Bottom rod; 13. Upper side rod; 14. Lower side rod; 15. Top block; 16. Middle block; 17. Bottom left block; 18. Bottom right block; 19. Side upright; 191. Insertion hole; 110. Bottom center block; 111. Bottom edge rod; 112. Bottom center rod; 113. Bottom edge block; 114. Center rod;

[0039] 2. Pull rod assembly; 21. Upper pull rod; 22. Lower pull rod;

[0040] 3. Wheel assembly; 31. Wheel; 32. Wheel frame; 33. Insert rod; 34. Plug; 35. Lower inner rod; 351. Slide groove; 352. Slot; 353. Mating groove; 36. Insert block; 361. Boss; 362. Receiving groove;

[0041] 4. Handle assembly; 41. Hinge block; 42. Connecting rod; 43. Lower handle; 44. Upper handle; 45. Grip; 46. Connecting block; 47. Telescopic rod; 471. Long slot; 48. Bottom plug; 481. Pin hole; 49. Pin; 410. Top plug; 411. Through rod; 412. Drive sleeve; 413. First spring; 414. Slider; 415. Transition ramp; 416. Second spring; 417. Middle plug; 418. Pressing part; 420. Inclined block;

[0042] 5. Extension assembly; 51. Crossbar; 52. Cross block; 53. Extension rod; 54. Extension block; 56. End block; 57. First folding rod; 58. Second folding rod. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0045] Example 1:

[0046] This embodiment illustrates the structure and principle of the extended folding cart, specifically:

[0047] like Figures 1-2 As shown, this application provides a folding trolley lever structure, including a frame assembly 1, which is the basic structure of the trolley and provides necessary support for the trolley;

[0048] The frame assembly 1 includes four sets of side uprights 19, which are distributed around the perimeter of the trolley, thus defining the load-bearing capacity of the trolley. A top block 15 is fixedly installed on top of the four sets of side uprights 19, and a middle block 16 is slidably installed in the middle of the four sets of side uprights 19. Multiple sets of rods are hinged to both the middle block 16 and the top block 15, and these multiple sets of rods constitute the overall frame of the trolley. Specifically:

[0049] like Figures 1-3 As shown, an upper rod 11 is hinged to the top block 15 along the direction of the trolley's movement. The upper rod 11 can rotate vertically along the top block 15. At the same time, a lower rod 12 is hinged to the middle block 16 along the direction of the trolley's movement. The lower rod 12 can rotate vertically along the middle block 16. The lower rod 12 and the upper rod 11 are hinged to each other at the middle position. For ease of explanation, the position where the upper rod 11 and the lower rod 12 are hinged to each other is defined as the first hinge point. Thus, the upper rod 11 and the lower rod 12 can rotate vertically around the first hinge point, causing the middle block 16 to slide on the side support rod 19.

[0050] Meanwhile, a middle rod 114 is hinged to both the upper side rod 11 and the lower side rod 12 at a position away from the side upright rod 19. Both ends of the middle rod 114 are hinged to the side rods, and the two sets of middle rods 114 are hinged to each other at the middle position. For ease of explanation, the hinge position of the two sets of middle rods 114 is defined as the second hinge point, so that the two sets of middle rods 114 can rotate in the vertical direction around the second hinge point.

[0051] In this application, the upper side rod 11 and the lower side rod 12, which are hinged to each other, are defined as side rod groups, and the middle rod 114, which is hinged to each other, is defined as middle rod group. Thus, the trolley in this embodiment is composed of two side rod groups and one middle rod group, forming a three-way intersection. During the process of the middle block 16 sliding along the side upright 19, the three-way intersection is suitable for unfolding to form a complete trolley, and the three-way intersection is suitable for gathering to facilitate storage.

[0052] Continue to refer to Figures 1-3A side upper rod 13 is hinged to the top block 15 at a position perpendicular to the direction of the trolley's movement, and a side lower rod 14 is hinged to the middle block 16 at a position perpendicular to the direction of the trolley's movement. There are two sets of side upper rods 13 and side lower rods 14, and the end of the side upper rod 13 is hinged to the end of the other set of side lower rods 14. At the same time, the two sets of adjacent side upper rods 13 and side lower rods 14 are hinged in the middle position. Thus, as the middle block 16 slides on the side upright 19, the side upper rod 13 and side lower rod 14 can rotate in the vertical direction and converge or expand synchronously.

[0053] Meanwhile, a bottom left block 17 is fixedly installed at the bottom end of the left side upright 19, and a bottom right block 18 is fixedly installed at the bottom end of the right side upright 19. A bottom edge rod 111 is hinged to both the bottom left block 17 and the bottom right block 18. The bottom edge rod 111 is adapted to rotate vertically along the bottom left block 17 (or bottom right block 18).

[0054] Furthermore, a bottom center block 110 is hinged to the bottom edge rod 111 at a position away from the side upright rod 19. The bottom center block 110 has four cross-shaped intersection points. Therefore, in addition to the position where the bottom center block 110 is hinged to the bottom edge rod 111, bottom center rods 112 are also hinged to the bottom center block 110 at two other hinge positions. For ease of explanation, the structure consisting of the two sets of bottom edge rods 111, one bottom center block 110, and the two sets of bottom center rods 112 is defined as a bottom rod group. This bottom rod group can perform the actions of gathering and unfolding during the vertical movement of the bottom center block 110.

[0055] In this embodiment, there are two sets of bottom rods, and a bottom edge block 113 is hinged between the two sets of bottom rods. The bottom edge block 113 is hinged to the bottom middle rod 112 in the two sets of bottom rods, thereby connecting the two sets of bottom rods into a whole through the bottom edge block 113.

[0056] To improve the stability of framework component 1, such as Figure 1 As shown, a pull rod assembly 2 is provided between the second hinge point and the bottom block 113. The pull rod assembly 2 includes an upper pull rod 21 fixedly installed at the second hinge point and a lower pull rod 22 fixedly installed at the bottom block 113. Both the upper pull rod 21 and the lower pull rod 22 are vertically arranged. At the same time, a pull rod groove with an open bottom end (not shown in the figure) is provided inside the upper pull rod 21, so that the lower pull rod 22 can slide vertically inside the upper pull rod 21 to adapt to the folding and unfolding of the frame assembly 1.

[0057] Meanwhile, a vertical groove (not shown in the figure) is provided on the pull rod 22, and a pin (not shown in the figure) is fixedly installed on the pull rod 21. The pin can slide in the groove, thereby restricting the sliding position of the pull rod 22 to prevent the pull rod 22 from coming out of the pull rod 21. When the trolley is folded up, the pull rod 22 is completely retracted into the pull rod 21, so that the height of the trolley will not change after the trolley is folded up.

[0058] In this embodiment, the shapes of the upper pull rod 21 and the lower pull rod 22 are not limited. They can be round tubes, flat round tubes, iron sheets, or other shapes, as long as the lower pull rod 22 can slide inside the upper pull rod 21.

[0059] In order to make the cart movable, such as Figure 2 and Figures 3-4 As shown, wheel assemblies 3 are provided at the bottom of each of the four sets of side uprights 19. Each wheel assembly 3 includes a lower inner rod 35 fixedly installed at the bottom of the side upright 19. The lower inner rod 35 has a bottom through groove 353 arranged along the length direction inside. The groove 353 is square, and an insert rod 33 is slidably arranged inside the groove 353. Thus, the insert rod 33 can slide inside the groove 353 and cannot rotate.

[0060] A wheel frame 32 is mounted on the bottom bearing of the insertion rod 33, and a wheel 31 is fixedly mounted on the wheel frame 32. The wheel 31 is used to drive the trolley to move.

[0061] To secure the insertion rod 33, such as Figures 3-4 As shown, a slot 352 with a side opening is provided at the upper end of the lower inner rod 35 located in the mating groove 353. A plug 36 is inserted into the slot 352, and a horizontal sliding groove 351 is provided at the upper end of the slot 352. A boss 361 is provided on the side of the plug 36, so that the plug 36 can slide into or out of the slot 352 with the cooperation of the sliding groove 351 and the boss 361.

[0062] Meanwhile, the side of the side support 19 is provided with a socket 191, which is used to facilitate the sliding out of the plug 36, and the boss 361 overlaps at the socket 191 to fix the position of the plug 36.

[0063] Furthermore, a receiving groove 362 is provided at the bottom of the plug 36. It should be noted that an elastic body is fixedly installed between the plug 36 and the slot 352. This elastic body is adapted to push the plug 36 out of the socket 191 in the initial state, thereby fixing the plug 36. When the elastic body is pressed, it is adapted to drive the plug 36 to slide into the socket 191. At the same time, a plug 34 is fixedly provided at the upper end of the plug rod 33. The plug 34 is adapted to the receiving groove 362. A step (not shown in the figure) is provided at the bottom of the receiving groove 362. A gap is provided between the plug 34 and the plug rod 33. This gap is adapted to the step. So when the plug rod 33 needs to be installed, the plug 36 is pressed, causing the plug 36 to slide into the side support rod 19. Then the plug rod 33 is pushed upward until the plug 34 is in the position of the receiving groove 362. Then the plug 36 is released. At this time, the plug 36 is reset under the action of the elastic body, and the plug rod 33 is fixed in the receiving groove 362.

[0064] When it is necessary to disassemble the insert rod 33, press the insert block 36 again to release the insert rod 33, thereby realizing the quick release of the insert rod 33 and the quick release of the wheel 31. This allows for a smaller volume when the frame assembly 1 is assembled, resulting in a smaller size of the trolley during packaging.

[0065] To facilitate staff operation, such as Figures 1-2 and Figure 5 As shown, a handle assembly 4 is installed on the bottom right block 18. The handle assembly 4 is used by the staff to push the cart. The handle assembly 4 includes a hinge block 41 hinged to the bottom right block 18, and a connecting rod 42 is hinged to the hinge block 41. Thus, the connecting rod 42 can rotate flexibly under the action of the two junction points.

[0066] Meanwhile, a receiving cavity (not shown in the figure) is provided at the end of the connecting rod 42 away from the hinge block 41. A telescopic rod 47 is movably inserted into the receiving cavity. The telescopic rod 47 is adapted to extend out of the receiving cavity to extend the connecting rod 42, and the telescopic rod 47 is adapted to be stored in the receiving cavity to reduce the volume occupied.

[0067] It should be noted that, as Figure 7 As shown, a pin 49 is inserted through the connecting rod 42, and a long groove 471 is provided on the telescopic rod 47, so that the pin 49 can slide in the long groove 471 to guide the extension and retraction of the telescopic rod 47.

[0068] In this embodiment, the shapes of the connecting rod 42 and the telescopic rod 47 are not limited. They can be round tubes, flat round tubes, iron sheets, or other shapes, as long as the telescopic rod 47 can extend and retract within the connecting rod 42.

[0069] like Figures 6-9As shown, a junction block 46 is hinged to the end of the two sets of telescopic rods 47 away from the connecting rod 42, so that the two sets of telescopic rods 47 can rotate around the junction block 46, so that they can work separately and be stored close to each other.

[0070] Meanwhile, a pull handle 43 is slidably provided on the junction block 46. A bottom plug 48 is fixedly installed at the bottom end of the pull handle 43. The bottom plug 48 is used to restrict the position of the pull handle 43 to prevent the pull handle 43 from coming off the junction block 46 upward. A top plug 410 is fixedly installed at the upper end of the pull handle 43 to prevent the pull handle 43 from coming off downward. It can be understood that the pull handle 43 can slide on the junction block 46. When the top plug 410 contacts the junction block 46, the pull handle 43 is in a retracted state, and when the bottom plug 48 contacts the junction block 46, the pull handle 43 is in an extended state.

[0071] Furthermore, a pin hole 481 is provided on the bottom plug 48, and an elastic body (not shown in the figure) is fixedly installed inside the pin hole 481. At the same time, a ball (not shown in the figure) is fixedly installed on the elastic body. The ball is adapted to contact the inner wall of the junction block 46, so that when the handle 43 is in the extended state, it can be held against the junction block 46 by the ball to limit the position of the handle 43.

[0072] Continue to refer to Figures 6-9 An upper handle 44 is slidably provided inside the lower handle 43. The upper handle 44 is adapted to extend out of the lower handle 43 and be stored inside the lower handle 43. At the same time, a handle 45 is fixedly installed at the upper end of the upper handle 44 to facilitate operation by the staff.

[0073] In order to extend and retract the upper handle 44, such as Figures 8-10 As shown, a pressing part 418 is slidably provided inside the upper end of the upper handle 44. A through rod 411 is fixedly installed at the bottom of the pressing part 418. A drive sleeve 412 is fixedly installed at the bottom of the through rod 411. Two sets of inclined blocks 420 are provided at the bottom of the drive sleeve 412. The two sets of inclined blocks 420 are arranged in a vertically downward direction, with their opposite faces moving away from each other. Thus, the operator can drive the pressing part 418 to move downward, thereby driving the two sets of inclined blocks 420 to move downward synchronously, and thus bringing the opposite faces of the two sets of inclined blocks 420 closer to each other.

[0074] Meanwhile, a middle plug 417 is fixedly installed at the upper end of the lower handle 43. Two sets of sliders 414 slide horizontally at the upper end of the middle plug 417, and a second spring 416 is fixedly installed between the two sets of sliders 414. Thus, in the initial state, the two sets of sliders 414 are far apart from each other and block the upper handle 44 at the upper end, so that the upper handle 44 cannot slide inside the lower handle 43. It should be noted that notches (not shown in the figure) are provided on both sides of the upper handle 44, so that in the initial state, the sliders 414 can be inserted into the notches to block the upper handle 44.

[0075] Furthermore, a transition ramp 415 is provided on the slider 414. The transition ramp 415 is adapted to the inclined block 420. When the two sets of inclined blocks 420 move downward, they will squeeze the slider 414 through the transition ramp 415, causing the two sets of sliders 414 to move closer to each other. This allows the upper handle 44 to pass over the slider 414 and slide downward in the lower handle 43.

[0076] Meanwhile, a first spring 413 is fixedly installed between the middle plug 417 and the drive sleeve 412. The first spring 413 is suitable for pressing, thereby causing the drive sleeve 412 to move downward.

[0077] In summary, when the staff presses the pressing part 418, it can drive the drive sleeve 412 to move downward and simultaneously drive the inclined block 420 to move downward, thereby causing the two sets of sliders 414 to move closer to each other and disengage from the notch. At this time, the upper handle 44 can slide downward inside the lower handle 43, thus completing the storage of the upper handle 44.

[0078] At the same time, the staff can manually pull the upper handle 44, so that the upper handle 44 extends out from the lower handle 43 and the slider 414 is locked into the notch to limit the upper handle 44. At this time, the staff can drive the cart by manipulating the upper handle 44.

[0079] Example 2:

[0080] During the use of the trolley, some goods are too long, and the original trolley structure cannot provide adequate support. In this case, it is usually necessary to add extension rods to achieve the desired result. However, the extension rods need to be installed and disassembled by the staff, which increases the workload of the staff.

[0081] To solve the above problems, such as Figure 10As shown, an extension assembly 5 is installed on the bottom left block 17. The extension assembly 5 is used to extend the trolley to carry longer goods. The extension assembly 5 includes a crossbar 51 hinged to the bottom left block 17. The crossbar 51 is arranged in a direction perpendicular to the direction of the trolley's movement. A cross block 52 is hinged between the two sets of crossbars 51, so that the cross block 52 can move in the vertical direction to drive the two sets of crossbars 51 to converge or extend together with the trolley.

[0082] In this embodiment, since the trolley is supported by two sets of crossbars 51, the side upper bar 13 and side lower bar 14 that are hinged to each other on this side are eliminated, thereby simplifying the structure of the trolley.

[0083] Meanwhile, an extension rod 53 is hinged to the bottom left block 17 along the direction of the trolley's movement. The extension rod 53 is adapted to rotate in the vertical direction to fit against the side upright 19 for storage, and to extend to the horizontal direction for carrying extended goods.

[0084] Continue to refer to Figure 10 An end block 56 is provided at the end of the extension rod 53, and an extension block 54 is slidably provided at the middle position of the extension rod 53. At the same time, a first folding rod 57 is hinged to the end block 56, and a second folding rod 58 is hinged to the extension block 54. The two sets of first folding rods 57 are hinged to each other at the other end, and the first folding rod 57 and the second folding rod 58 are hinged to each other at the middle position, so that the two sets of extension rods 53 can be folded and stored together, and unfolded for carrying extended goods.

[0085] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A folding handcart pull rod structure, characterized in that: The trolley includes a frame assembly that provides support for the trolley and has a bottom right block and a bottom left block; a wheel assembly is detachably mounted on the bottom of the frame assembly; and a handle assembly including: a hinge block hinged to the bottom right block, with a connecting rod hinged to the hinge block; a telescopic rod slidably inserted into the connecting rod; a junction block hinged to the telescopic rod; a lower handle slidably inserted into the junction block; and an upper handle slidably inserted into the lower handle; a pin passes through the connecting rod, and an elongated groove is formed on the telescopic rod; the pin slides in the elongated groove to guide the extension and retraction of the telescopic rod; the telescopic rod is adapted to be stored in a receiving cavity to reduce its volume; the two sets of telescopic rods rotate around the junction block, facilitating their separation for operation and their proximity for storage; The upper handle has a sliding pressing part at its inner upper end, a through rod fixedly installed at the bottom of the pressing part, a drive sleeve fixedly installed at the bottom of the through rod, and two sets of inclined blocks at the bottom of the drive sleeve. The two sets of inclined blocks are arranged vertically downwards with their opposite faces far apart. The lower handle has a fixed middle plug at its inner upper end, and two sets of sliders slide horizontally at the upper end of the middle plug. A second spring is fixedly installed between the two sets of sliders. The upper handle has notches on both sides. The wheel assembly includes a lower inner rod installed at the bottom of the side upright. The lower inner rod has a through-groove along its length, and the groove is square. A rod slides inside the groove. A wheel frame is mounted on the bottom bearing of the rod, and a wheel is mounted on the wheel frame. The lower inner rod has a slot with a side opening at the upper end of the groove. A plug is inserted into the slot, and the upper end of the slot has a horizontal groove. The side of the plug has a boss. The side of the side upright has a hole, and the bottom of the plug has a receiving groove. An elastic body is installed between the plug and the slot. The elastic body is adapted to push the plug out of the hole in the initial state. When pressed, the elastic body is adapted to slide the plug into the hole. The upper end of the rod has a plug that fits into the receiving groove, and the bottom of the receiving groove has a step. An extension assembly is mounted on the bottom left block. The extension assembly includes a crossbar hinged to the bottom left block, the crossbar being positioned perpendicular to the direction of the trolley's movement. Two sets of crossbars are hinged together by a cross block. An extension rod is hinged to the bottom left block along the direction of the trolley's movement, and the extension rod is adapted to rotate vertically. An end block is provided at the end of the extension rod, and an extension block is slidably positioned at the middle of the extension rod. A first folding rod is hinged to the end block, and a second folding rod is hinged to the extension block. The two sets of first folding rods are hinged together at their other ends. The first and second folding rods are hinged together at the middle position; a pull rod assembly is installed between the bottom block and the second hinge point. The pull rod assembly includes: an upper pull rod fixedly installed at the second hinge point and a lower pull rod fixedly installed at the bottom block. Both the upper and lower pull rods are vertically arranged. The upper pull rod has a pull rod groove with an opening at the bottom end inside. The lower pull rod has a vertical waist groove. A pin is fixedly installed on the upper pull rod. When the trolley is folded up, the lower pull rod is completely retracted into the upper pull rod, and the height of the trolley does not change.

2. The folding handcart pull rod structure according to claim 1, characterized in that: A top plug is fixedly installed at the upper end of the pull handle, and a bottom plug is fixedly installed at the bottom end of the pull handle. A pin hole is provided on the bottom plug, and an elastic body is fixedly installed inside the pin hole. A ball is fixedly installed on the elastic body.

3. The handcart pull rod structure according to claim 1, characterized in that: The slider is equipped with a transition ramp that is compatible with the inclined block; a first spring is installed between the middle plug and the drive sleeve.

4. The folding handcart pull rod structure according to claim 1, characterized in that: The frame assembly includes: four sets of side uprights, with a top block fixedly installed at the upper end of each side upright and a middle block slidably installed in the middle of each side upright; an upper side upright hinged to the top block; a lower side upright hinged to the middle block, with the lower side upright and the upper side upright hinged at the middle position; a middle rod group having two sets of middle rods hinged to each other, which are respectively hinged to the upper and lower side uprights, with the two sets of middle rods hinged at the middle position and forming a second junction point; a bottom left block hinged to the bottom of one side upright; a bottom right block hinged to the bottom of the other side upright; and two sets of bottom rod groups, which are respectively hinged to the bottom left and bottom right blocks, with a bottom side block hinged to the other end of each bottom rod group.

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