Lifting capacity increasing type cart frame and cart

Abstract

The invention discloses a capacity increasing type trolley frame and a trolley, and belongs to the technical field of trolleys. The device mainly comprises four sets of vertical rods, and long-strip-shaped holes are vertically formed in the vertical rods. The inner rod is inserted into the vertical rod in a sliding mode, an insertion hole is formed in the bottom of the inner rod, and a pin shaft is arranged in the insertion hole; the middle sleeve is arranged on the outer ring of the vertical rod in a sleeving manner and is mounted with the pin shaft; the top sleeve is arranged on the outer ring of the inner rod in a sliding and sleeving manner; the lower cross rod is hinged to the middle sleeve; the upper cross rod is hinged to the top sleeve; the middle cross rod is mounted at the tail ends of the upper cross rod and the lower cross rod; the lower fork rod is hinged to the middle sleeve; and the upper fork rod is hinged on the top sleeve. According to the increased capacity increasing type trolley frame and the trolley, by arranging the frame mechanism, when the trolley is stored, the space of the trolley in the length direction and the width direction can be relieved through capacity increasing in the height direction, and the purpose of increasing the cargo carrying capacity of the trolley is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of trolleys, and in particular to a lifting and capacity-increasing trolley frame and a trolley. Background Art

[0002] A handcart is a transport vehicle that is pushed and pulled by manpower. Although the transport technology is constantly developing, handcarts are still used as an indispensable transport tool. Handcarts are low-cost, simple to maintain, easy to operate, and light in weight. They can work in places where motor vehicles are inconvenient to use. They are very convenient for transporting light items over short distances.

[0003] During the use of the trolley, it is often necessary to fold it to save the space occupied by the trolley;

[0004] For example, the invention patent with publication number CN111003052 A discloses a folding stroller and a baby stroller, which are provided with a rod assembly, a front bracket assembly, a rear bracket assembly, a seat rod assembly, a connecting rod assembly and a sliding sleeve assembly, so that when the folding stroller is stored, the sliding sleeve assembly slides on the push rod assembly, and then the connecting rod assembly and the seat rod assembly rotate, so that the folding stroller is folded and stored.

[0005] Although the above patent realizes the folding of the trolley in the direction of travel, thereby reducing the volume of the trolley when stored, during the use of the trolley, a wider size is often required in both the width and length directions so that the trolley can carry more goods. Therefore, the trolley still occupies a large volume due to folding in only one direction, which cannot meet the storage needs of the trolley. At the same time, in different usage scenarios, there is a large space in the height direction. If the body of the trolley in the length and width directions is stored in a higher position during storage, the capacity of the trolley can be increased in design. Therefore, it is necessary to provide a lifting and capacity-increasing trolley frame and trolley to solve the above problems.

[0006] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Summary of the invention

[0007] Based on the above-mentioned problems existing in the prior art, the problem to be solved by the present application is: to provide a lifting and capacity-expanding trolley frame and trolley, which can alleviate the space of the trolley in the length and width directions by increasing the height, so as to increase the cargo capacity of the trolley.

[0008] The technical solution adopted by the present application to solve its technical problems is: an elevated and expandable cart frame and cart, including four groups of vertical poles, each of which is vertically provided with a long hole; an inner rod, which is slidably inserted inside the vertical pole, and a plug hole is provided at the bottom of the inner rod, and a pin is fixedly provided in the plug hole, and the pin passes through the long hole; an intermediate sleeve, which is sleeved on the outer ring of the vertical pole and fixedly installed with the pin; a top sleeve, which is slidably sleeved on the outer ring of the inner pole; a lower cross bar, which is hinged on the The middle sleeve is hinged on the upper cross bar, the upper cross bar is hinged on the top sleeve, and the upper cross bar is hinged with the lower cross bar at the middle position; the middle cross bar is installed at the ends of the upper cross bar and the lower cross bar, and the middle cross bar is hinged at the middle position; the lower fork rod is hinged on the middle sleeve; the upper fork rod is hinged on the top sleeve, and the upper fork rod is hinged with the lower fork rod at the middle position; wherein the two groups of the upper fork rods and the two groups of the lower fork rods are hinged to each other.

[0009] Furthermore, a step is formed at the connection between the vertical rod and the inner rod.

[0010] Furthermore, the bottom of the elongated hole is defined as a limiting portion.

[0011] Furthermore, the four groups of vertical poles are divided into two groups of front vertical poles located at the front end, and two groups of rear vertical poles located at the rear end, the bottom of the front vertical poles is fixedly installed with a front bottom sleeve, the bottom of the rear vertical poles is fixedly installed with a rear bottom sleeve, the inner side of the front bottom sleeve is hinged with a front bottom rod, and the inner side of the rear bottom sleeve is hinged with a rear bottom rod; the front bottom rod is hinged with a front bottom block at a position away from the front bottom sleeve, and the rear bottom rod is hinged with a rear bottom block at a position away from the rear bottom sleeve, the rear bottom block and the front bottom block are both located in the middle position of the bottom, and are fixedly installed between the rear bottom block and the front bottom block.

[0012] Furthermore, the upper end of the inner rod is covered with a sealing cover.

[0013] The utility model discloses a lifting and expandable trolley, which comprises a lifting and expandable trolley frame.

[0014] Furthermore, it also includes a wheel mechanism, which includes a lower inner rod fixedly installed at the bottom of the vertical rod, the interior of the lower inner rod is provided with a matching groove that passes through the bottom along the length direction, and an insertion rod is slidably arranged inside the matching groove; a wheel frame is installed on the bottom bearing of the insertion rod, and a wheel body is fixedly installed on the wheel frame.

[0015] Furthermore, a slot with a side opening is provided at the upper end of the lower inner rod, an insert block is inserted inside the slot, a horizontal slide groove is provided at the upper end of the slot, and a boss is provided on the side of the insert block; holes are provided on the side of the vertical rod, and an elastomer is fixedly installed between the insert block and the vertical rod; a receiving groove is provided at the bottom of the insert block, a plug is fixedly provided at the upper end of the insert rod, the plug is adapted to the receiving groove, a step is provided at the bottom of the receiving groove, a gap is provided between the plug and the insert rod, and the gap is adapted to the step.

[0016] Furthermore, it also includes a push-pull mechanism, which includes a hinge block, a bottom pull rod is hinged on the hinge block; a pull block is hingedly installed on the end of the bottom pull rod away from the hinge block, a lower pull rod is fixedly installed on the pull block, an upper pull rod is installed on the lower pull rod, a handle is fixedly installed on the upper pull rod, and the bottom pull rod and the lower pull rod are both hingedly installed; a cavity is opened at the upper end of the lower pull rod, a spring sheet is arranged on the upper pull rod, and a limiting hole is arranged on the side of the lower pull rod.

[0017] Furthermore, a brake assembly is provided on the wheel mechanism, and the brake assembly includes a fixed seat fixedly mounted on a group of the wheel frames, a first rotating part is provided on the fixed seat, an unlocking block is rotatably provided on the first rotating part, and a third rotating part is provided on the unlocking block, which is mounted in cooperation with the first rotating part; at the same time, a fourth rotating part is provided at the lower end of the unlocking block, a locking block is rotatably provided on the fourth rotating part, and a sixth rotating part is provided on the locking block, which is mounted in cooperation with the fourth rotating part; a fifth rotating part is provided at the lower end of the locking block, a contact block is rotatably provided on the fifth rotating part, and a second rotating part is provided on the contact block, which is mounted in cooperation with the fifth rotating part; a contact part is provided at the bottom of the contact block, and a torsion spring is provided at the connecting position of the first rotating part and the second rotating part; a supporting part is provided at the lower end of the unlocking block.

[0018] The present application provides a lifting and capacity-increasing trolley frame and trolley, which have the following beneficial effects:

[0019] 1. By providing a frame mechanism, when the trolley is stored, the space in the length and width directions of the trolley can be relieved by increasing the height, so as to achieve the purpose of increasing the cargo capacity of the trolley.

[0020] 2. By providing a detachable wheel mechanism, the wheel assembly can be loaded when the trolley is loaded, and the wheel assembly can be disassembled when the trolley is stored, so as to reduce the occupied space in the height direction when the trolley is stored.

[0021] 3. By providing a brake assembly, the stability of the trolley can be improved when the trolley stops, so as to facilitate the loading of goods with the trolley.

[0022] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0024] In the attached picture:

[0025] Figure 1 It is an overall schematic diagram of a lifting and expanding capacity trolley frame in the present application;

[0026] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the medium-high-rise and expandable trolley frame;

[0027] Figure 3 for Figure 1 Schematic diagram of the folding structure of the mid-to-high capacity-expanding trolley frame;

[0028] Figure 4 for Figure 2 Schematic diagram of the local structure at A in the middle;

[0029] Figure 5 It is an overall schematic diagram of a lifting and expandable cart in the present application;

[0030] Figure 6 for Figure 5 Schematic diagram of the explosion structure of the medium-high rise expandable trolley;

[0031] Figure 7 for Figure 6 Schematic diagram of the local structure at B in the middle;

[0032] Figure 8 for Figure 7 A schematic diagram of the structure of the middle insert block and the lower inner rod;

[0033] Fig. 9 for Figure 6 Schematic diagram of the local structure at C in the middle;

[0034] Fig.10 for Figure 6 Schematic diagram of the local structure at D in the middle;

[0035] Fig.11 for Fig.10 Schematic diagram of the exploded structure of the middle brake assembly;

[0036] Among them, the reference numerals in the figure are:

[0037] 1. Frame mechanism; 11. Front upright pole; 12. Rear upright pole; 13. Front bottom sleeve; 14. Rear bottom sleeve; 15. Front bottom pole; 16. Rear bottom pole; 17. Front bottom block; 18. Rear bottom block; 19. Upper cross bar; 110. Lower cross bar; 111. Middle cross bar; 112. Top sleeve; 113. Middle sleeve; 114. Upper fork pole; 115. Lower fork pole; 116. Cover; 117. Inner pole; 118. Long hole; 119. Socket; 120. Hole;

[0038] 2. wheel mechanism; 21. wheel body; 22. wheel frame; 23. plug rod; 24. plug; 25. lower inner rod; 251. slide groove; 252. slot; 253. matching groove; 26. plug block; 261. boss; 262. receiving groove;

[0039] 3. Push-pull mechanism; 31. Lower pull rod; 311. Limiting hole; 32. Upper pull rod; 321. Shrapnel; 33. Handle; 34. Pull block; 35. Bottom pull rod; 36. Articulated block;

[0040] 4. Braking assembly; 43. Fixed seat; 431. First rotating part; 44. Contact block; 441. Second rotating part; 442. Contact part; 45. Unlocking block; 451. Third rotating part; 452. Fourth rotating part; 453. Abutting part; 46. Locking block; 461. Fifth rotating part; 462. Sixth rotating part. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0043] like Figure 1-Figure 4As shown, the present application provides a lifting and capacity-increasing trolley frame, including a frame mechanism 1, which is the main body of the trolley and is mainly used for loading goods. The frame mechanism 1 includes four groups of upright poles. In the present application, the four groups of upright poles are divided into two groups of front upright poles 11 located at the front end, and two groups of rear upright poles 12 located at the rear end. At the same time, a front bottom sleeve 13 is fixedly installed at the bottom of the front upright pole 11, and a rear bottom sleeve 14 is fixedly installed at the bottom of the rear upright pole 12, and a front bottom rod 15 is hinged on the inner side of the front bottom sleeve 13, and a rear bottom rod 16 is hinged on the inner side of the rear bottom sleeve 14, so that the front bottom rod 15 can rotate around the front bottom sleeve 13 in the vertical direction, and the rear bottom rod 16 is suitable for rotating around the rear bottom sleeve 14 in the vertical direction;

[0044] At the same time, a front bottom block 17 is hingedly connected at a position of the front bottom rod 15 away from the front bottom sleeve 13, and a rear bottom block 18 is hingedly connected at a position of the rear bottom rod 16 away from the rear bottom sleeve 14. The rear bottom block 18 and the front bottom block 17 are both located at the middle position of the bottom of the frame mechanism 1, and the rear bottom block 18 is fixedly installed between the front bottom block 17, so that when the front bottom rod 15 and the rear bottom rod 16 rotate in the vertical direction, the front bottom block 17 and the rear bottom block 18 can be driven to rotate synchronously;

[0045] Continue to refer Figure 1-Figure 4 The front upright pole 11 and the rear upright pole 12 are both hollow, and openings (not shown) are provided at the upper ends of the four sets of upright poles, and inner poles 117 are inserted into the openings, so that the inner poles 117 can slide vertically inside the upright poles;

[0046] At the same time, an intermediate sleeve 113 is slidably arranged at the outer end of the vertical rod, and a through-long hole 118 is vertically arranged on the vertical rod. It should be noted that a plug hole 119 is arranged at the bottom of the inner rod 117, and a pin shaft (not shown in the figure) is fixedly arranged in the plug hole 119. The pin shaft passes through the long hole 118 and is fixedly installed with the intermediate sleeve 113, so that when the inner rod 117 slides vertically, the intermediate sleeve 113 can be driven to slide synchronously along the long hole 118;

[0047] A top sleeve 112 is slidably provided on the inner rod 117, so that when the inner rod 117 slides, it will not be affected by the top sleeve 112, and at the same time, the top sleeve 112 can slide relatively adaptively when the inner rod 117 slides;

[0048] like Figure 1 As shown, a lower cross bar 110 is hinged on the middle sleeve 113, and the lower cross bar 110 is arranged along the length direction of the frame mechanism 1. At the same time, an upper cross bar 19 is hinged on the top sleeve 112, and the upper cross bar 19 is also arranged along the length direction. The upper cross bar 19 and the lower cross bar 110 are hinged at the middle position, so that the upper cross bar 19 and the lower cross bar 110 can rotate in the vertical direction around the midpoint position;

[0049] At the same time, a middle cross bar 111 is hinged at the ends of the upper cross bar 19 and the lower cross bar 110, and the two sets of middle cross bars 111 are hinged at the middle position, so that the middle cross bars 111 can also rotate around the middle position;

[0050] Continue to refer Figure 1 A lower fork rod 115 is hinged on the middle sleeve 113, and an upper fork rod 114 is hinged on the top sleeve 112. The lower fork rod 115 and the upper fork rod 114 are both arranged along the width direction of the frame mechanism 1, and the lower fork rod 115 and the upper fork rod 114 are hinged at a middle position, so that the lower fork rod 115 and the upper fork rod 114 can rotate around the middle position;

[0051] At the same time, the two sets of upper fork rods 114 and the two sets of lower fork rods 115 are hinged to each other, so that the two sets of upper fork rods 114 and the two sets of lower fork rods 115 can rotate around their respective hinge points;

[0052] In summary, the frame mechanism 1 of the trolley has two states, namely, an unfolded loading state and a folded storage state, respectively. Figure 1 and Figure 3 ;

[0053] When the frame mechanism 1 is in the unfolded loading state, the middle sleeve 113 is located at the upper end of the long hole 118, and the top sleeve 112 is located near the middle sleeve 113, that is, the middle sleeve 113 and the top sleeve 112 are close to each other, and the inner rod 117 protrudes outside the vertical rod. At this time, the multiple rod groups are in the open state, and the front bottom block 17 and the rear bottom block 18 are at the bottom position;

[0054] It should be noted that a step (not shown in the figure) is formed at the connection between the vertical rod and the inner rod 117. When the frame mechanism 1 is in the unfolded loading state, the bottom of the top cover 112 abuts against the step, thereby limiting the unfolded loading state of the frame mechanism 1.

[0055] When the frame mechanism 1 needs to be switched from the unfolded cargo loading state to the folded storage state, the inner rod 117 is retracted into the interior of the vertical rod, and the intermediate sleeve 113 moves downward synchronously with the inner rod 117 and abuts against the bottom of the long hole 118. The bottom of the long hole 118 is defined as a limiting portion, which can limit the lowermost position of the intermediate sleeve 113, thereby limiting the folded storage state of the frame mechanism 1.

[0056] When the inner rod 117 is completely stored in the vertical rod, the middle sleeve 113 and the top sleeve 112 are in a position away from each other, at which time the multiple rod groups are in a folded state, and the front bottom block 17 and the rear bottom block 18 are in the top position;

[0057] Therefore, through the above-mentioned arrangement, the frame mechanism 1 can be unfolded and stored, and by setting a longer strip hole 118, the space in the length and width directions of the trolley can be alleviated by increasing the height, so as to achieve the effect of increasing the cargo capacity of the trolley.

[0058] More preferably, in order to prevent the top sleeve 112 from sliding out of the upper end of the inner rod 117 , a cover 116 is covered on the upper end of the inner rod 117 , so that the upper end of the inner rod 117 can be sealed.

[0059] The present application also provides a lifting and expanding capacity cart, such as Figure 5-Figure 6 As shown, the cart includes the frame mechanism 1 described above, so that the cart can also be unfolded and folded to facilitate loading and storage;

[0060] In order to make the cart movable, Figure 5-Figure 6 and Figure 7-Figure 8 As shown, a wheel mechanism 2 is provided at the bottom of each of the four groups of vertical poles. The wheel mechanism 2 includes a lower inner rod 25 fixedly mounted at the bottom of the vertical pole. A matching groove 253 penetrating the bottom is provided inside the lower inner rod 25 along the length direction. The matching groove 253 is square in shape, and an insertion rod 23 is slidably provided inside the matching groove 253, so that the insertion rod 23 can slide inside the matching groove 253 and cannot rotate.

[0061] A wheel frame 22 is installed on the bottom bearing of the insertion rod 23, and a wheel body 21 is fixedly installed on the wheel frame 22. The wheel body 21 is used to drive the cart to move;

[0062] In order to fix the insertion rod 23, as Figure 7-Figure 8 As shown, a slot 252 with a side opening is provided at the upper end of the lower inner rod 25 located at the matching groove 253, an insert block 26 is inserted inside the slot 252, and a horizontal slide groove 251 is provided at the upper end of the slot 252, and a boss 261 is provided on the side of the insert block 26, so that the insert block 26 can slide into or out of the slot 252 under the cooperation of the slide groove 251 and the boss 261;

[0063] At the same time, a hole 120 is provided on the side of the vertical pole, and the hole 120 is used to facilitate the sliding out of the plug block 26, and the boss 261 is overlapped at the hole 120, so as to fix the position of the plug block 26. It should be noted that an elastic body (not shown in the figure) is fixedly installed between the plug block 26 and the vertical pole, and the elastic body is suitable for pushing the plug block 26 to protrude from the hole 120 in the initial state, so that the plug block 26 is fixed, and the elastic body is suitable for driving the plug block 26 to slide into the interior of the vertical pole when pressed;

[0064] A receiving groove 262 is provided at the bottom of the plug block 26, and a plug 24 is fixedly provided at the upper end of the plug rod 23, the plug 24 is adapted to the receiving groove 262, and a step (not shown) is provided at the bottom of the receiving groove 262, and a gap is provided between the plug 24 and the plug rod 23, the gap is adapted to the step, so that when the plug rod 23 needs to be installed, the plug block 26 is pressed to make the plug block 26 slide into the vertical pole, and then the plug rod 23 is pushed upward until the plug 24 is located at the position of the receiving groove 262, and then the plug block 26 is released, at which time the plug block 26 is reset under the action of the elastic body, and the plug rod 23 is fixed in the receiving groove 262;

[0065] When the insertion rod 23 needs to be removed, the insertion block 26 can be pressed again to remove the insertion rod 23, thereby realizing the quick release of the insertion rod 23 and then the quick release of the wheel body 21, so that a smaller volume can be achieved when the cart is stored.

[0066] In order to facilitate the operation of staff, Figure 5-Figure 6 and Fig. 9 As shown, a push-pull mechanism 3 is installed on the front bottom sleeve 13, and the push-pull mechanism 3 is used for the staff to push the cart. The push-pull mechanism 3 includes a hinge block 36 hinged on the front bottom sleeve 13, and a bottom pull rod 35 is hinged on the hinge block 36, so that the bottom pull rod 35 can be flexibly rotated under the action of two hinge points;

[0067] At the same time, a pull block 34 is hingedly installed at one end of the bottom pull rod 35 away from the hinge block 36, and a lower pull rod 31 is fixedly installed on the pull block 34, and an upper pull rod 32 is installed on the lower pull rod 31, and a handle 33 is fixedly installed on the upper pull rod 32, so that the staff can hold the handle 33 to drive the cart to move, thereby achieving a labor-saving effect, and the bottom pull rod 35 and the lower pull rod 31 are both hingedly installed, so that when the cart is folded, the push-pull mechanism 3 can also be folded, thereby further reducing the volume of the cart;

[0068] A cavity (not marked in the figure) is provided at the upper end of the lower pull rod 31, and the upper pull rod 32 can slide in the cavity, so that the upper pull rod 32 can slide into the lower pull rod 31 for storage. At the same time, a spring piece 321 is provided on the upper pull rod 32, and a limiting hole 311 is provided on the side of the lower pull rod 31, so that the spring piece 321 can be inserted into the limiting hole 311 to fix the upper pull rod 32 in the elongated state. When storage is required, the spring piece 321 is pressed to make the spring piece 321 enter the interior of the lower pull rod 31. At this time, the upper pull rod 32 can smoothly slide into the cavity of the lower pull rod 31.

[0069] During the movement of the cart, it is necessary to brake it according to the situation, so a brake assembly 4 is provided on the wheel mechanism 2. The structure and principle of the brake assembly 4 are described below, specifically:

[0070] like Figure 1-Figure 2 and Figure 10-11 As shown, the brake assembly 4 includes a fixed seat 43 fixedly mounted on a set of wheel frames 22, the fixed seat 43 is provided with a first rotating portion 431, and an unlocking block 45 is rotatably provided on the first rotating portion 431. It should be noted that a third rotating portion 451 is provided on the unlocking block 45 and is mounted in cooperation with the first rotating portion 431, so that the unlocking block 45 can rotate around the fixed seat 43;

[0071] Meanwhile, a fourth rotating portion 452 is provided at the lower end of the unlocking block 45, and a locking block 46 is rotatably provided on the fourth rotating portion 452. It should be noted that a sixth rotating portion 462 is provided on the locking block 46 and is mounted in cooperation with the fourth rotating portion 452, so that the locking block 46 can rotate relative to the unlocking block 45;

[0072] A fifth rotating portion 461 is provided at the lower end of the locking block 46, and the contact block 44 is rotatably provided on the fifth rotating portion 461. It should be noted that a second rotating portion 441 is provided on the contact block 44 to cooperate with the fifth rotating portion 461, so that the contact block 44 can rotate relative to the locking block 46;

[0073] Meanwhile, a contact portion 442 is provided at the bottom of the contact block 44, and the contact portion 442 is suitable for contacting the surface of the wheel body 21 so as to brake the wheel body 21, and a torsion spring (not shown in the figure) is provided at the connection position between the first rotating portion 431 and the second rotating portion 441, and the torsion spring makes the contact portion 442 away from the wheel body 21 in the initial state, so as not to interfere with the rotation of the wheel body 21;

[0074] A supporting portion 453 is provided at the lower end of the unlocking block 45, and the supporting portion 453 is used to contact the upper end of the contact block 44 so as to make the contact portion 442 away from the wheel body 21;

[0075] Therefore, when the staff steps on the locking block 46, the contact portion 442 will be driven to rotate downward and contact the wheel body 21, thereby achieving the braking of the cart;

[0076] When the staff steps on the unlocking block 45, the contact portion 442 will be driven to rotate upward and separate from the wheel body 21, thereby unlocking the cart.

[0077] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lifting and capacity-increasing trolley frame, characterized in that: include: Four groups of vertical poles, each of which is vertically provided with long holes (118); An inner rod (117), the inner rod (117) is slidably inserted inside the vertical rod, a plug hole (119) is provided at the bottom of the inner rod (117), a pin is fixedly provided inside the plug hole (119), and the pin passes through the long hole (118); An intermediate sleeve (113), which is sleeved on the outer ring of the vertical pole and fixedly installed with a pin shaft; A top sleeve (112), the top sleeve (112) being slidably sleeved on the outer ring of the inner rod (117); A lower cross bar (110), the lower cross bar (110) being hinged to the middle sleeve (113); An upper cross bar (19), the upper cross bar (19) being hinged on the top sleeve (112), and the upper cross bar (19) being hinged with the lower cross bar (110) at a middle position; A middle crossbar (111), which is mounted at the ends of the upper crossbar (19) and the lower crossbar (110), and the middle crossbar (111) is hinged at a middle position; A lower fork rod (115), the lower fork rod (115) being hinged to the intermediate sleeve (113); An upper fork rod (114), the upper fork rod (114) being hinged to the top sleeve (112), the upper fork rod (114) being hinged to the lower fork rod (115) at a middle position; The two groups of upper fork rods (114) and the two groups of lower fork rods (115) are hinged to each other.

2. The elevating and expandable trolley frame according to claim 1, characterized in that: A step is formed at the connection between the vertical rod and the inner rod (117).

3. The elevating and expandable trolley frame according to claim 2, characterized in that: The bottom of the elongated hole (118) is defined as a limiting portion.

4. The elevating and expandable trolley frame according to claim 3, characterized in that: The four groups of upright poles are divided into two groups of front upright poles (11) located at the front end, and two groups of rear upright poles (12) located at the rear end, the bottom of the front upright poles (11) is fixedly mounted with a front bottom sleeve (13), the bottom of the rear upright poles (12) is fixedly mounted with a rear bottom sleeve (14), the inner side of the front bottom sleeve (13) is hinged with a front bottom rod (15), and the inner side of the rear bottom sleeve (14) is hinged with a rear bottom rod (16); A front bottom block (17) is hingedly connected to the front bottom rod (15) at a position away from the front bottom sleeve (13); a rear bottom block (18) is hingedly connected to the rear bottom rod (16) at a position away from the rear bottom sleeve (14); the rear bottom block (18) and the front bottom block (17) are both located at the middle position of the bottom; the rear bottom block (18) and the front bottom block (17) are fixedly installed.

5. The elevating and expandable trolley frame according to claim 4, characterized in that: The upper end of the inner rod (117) is covered with a sealing cover (116).

6. A lifting and expanding trolley, characterized in that: The invention comprises a lifting and expandable trolley frame as claimed in claim 1.

7. The elevating and expandable trolley according to claim 6, characterized in that: It also comprises a wheel mechanism (2), the wheel mechanism (2) comprising a lower inner rod (25) fixedly mounted at the bottom of the vertical rod, a bottom-through matching groove (253) is provided inside the lower inner rod (25) along the length direction, and an insertion rod (23) is slidably provided inside the matching groove (253); A wheel frame (22) is installed on the bottom bearing of the insertion rod (23), and a wheel body (21) is fixedly installed on the wheel frame (22).

8. The elevating and expandable trolley according to claim 7, characterized in that: The upper end of the lower inner rod (25) is provided with a slot (252) with a side opening, an insert block (26) is inserted inside the slot (252), a horizontal slide groove (251) is provided at the upper end of the slot (252), and a boss (261) is provided on the side of the insert block (26); A hole (120) is provided on the side of the vertical pole, and an elastic body is fixedly installed between the insert block (26) and the vertical pole; The bottom of the plug block (26) is provided with a receiving groove (262), the upper end of the plug rod (23) is fixedly provided with a plug (24), the plug (24) is adapted to the receiving groove (262), the bottom of the receiving groove (262) is provided with a step, and a gap is provided between the plug (24) and the plug rod (23), the gap being adapted to the step.

9. The elevating and expandable trolley according to claim 8, characterized in that: It also includes a push-pull mechanism (3), wherein the push-pull mechanism (3) includes a hinge block (36), and a bottom pull rod (35) is hingedly connected to the hinge block (36); A pull block (34) is hingedly mounted on one end of the bottom pull rod (35) away from the hinge block (36); a lower pull rod (31) is fixedly mounted on the pull block (34); an upper pull rod (32) is mounted on the lower pull rod (31); a handle (33) is fixedly mounted on the upper pull rod (32); the bottom pull rod (35) and the lower pull rod (31) are both hingedly mounted; A cavity is provided at the upper end of the lower pull rod (31), a spring sheet (321) is provided on the upper pull rod (32), and a limiting hole (311) is provided on the side of the lower pull rod (31).

10. The elevating and expandable trolley according to claim 9, characterized in that: The wheel mechanism (2) is provided with a brake assembly (4), the brake assembly (4) comprising a fixing seat (43) fixedly mounted on a group of the wheel frames (22), the fixing seat (43) being provided with a first rotating portion (431), an unlocking block (45) being rotatably provided on the first rotating portion (431), and the unlocking block (45) being provided with a third rotating portion (451) mounted in cooperation with the first rotating portion (431); At the same time, a fourth rotating part (452) is provided at the lower end of the unlocking block (45), a locking block (46) is rotatably provided on the fourth rotating part (452), and a sixth rotating part (462) is provided on the locking block (46) and is mounted in cooperation with the fourth rotating part (452); A fifth rotating portion (461) is disposed at the lower end of the locking block (46), a contact block (44) is rotatably disposed on the fifth rotating portion (461), and a second rotating portion (441) is disposed on the contact block (44) and is mounted in cooperation with the fifth rotating portion (461); A contact portion (442) is provided at the bottom of the contact block (44), and a torsion spring is provided at the connection position between the first rotating portion (431) and the second rotating portion (441); The lower end of the unlocking block (45) is provided with a supporting portion (453).

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