Folding frame and folding trolley

Abstract

The folding frame comprises a handrail push rod, a rear connecting rod and a front connecting rod, and the handrail push rod is provided with a first section and a fourth section which are connected with each other; the rear connecting rod is provided with a first end and a second end, the first end is rotatably connected between the first section and the fourth section, and the second end is connected with a rear wheel of the folding frame; the front connecting rod is provided with a third end and a fourth end, the third end is rotatably connected to the fourth section, the fourth end is located on the front side of the third end and connected with a front wheel of the folding frame in the front-back direction of the folding frame, and the second end and the fourth end are spaced in the front-back direction of the folding frame. The folding frame is simple in overall structure, low in production cost, few in operation steps during storage, convenient to store and small in occupied space after being stored.

Description

Technical Field

[0001] The utility model relates to the technical field of trolleys, in particular to a foldable frame and a foldable trolley. Background Art

[0002] In the relevant patent literature (refer to the Chinese patent with publication number CN107856724A), in order to simplify the complicated steps of folding the folding frame and reduce the space occupied by the folding frame when folding, a gear transmission assembly or a connecting rod is arranged between the push rod and the front wheel bracket, so that the folding frame can drive the front wheel bracket to move toward the rear wheel bracket when the push rod is pressed down, so as to simplify the folding steps; however, the gear transmission assembly or the connecting rod is arranged between the push rod and the front wheel bracket, and the overall structure of the folding frame is relatively complicated, and the production cost is high. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a folding frame with a simple structure, convenient storage, small occupied space after storage, and low production cost.

[0004] The utility model also provides a folding trolley with the folding frame.

[0005] According to the first aspect of the present invention, the folding frame includes: an armrest push rod having a first section and a fourth section connected to each other; a rear connecting rod having a first end and a second end, the first end being rotatably connected between the first section and the fourth section, and the second end being connected to the rear wheel of the folding frame; a front connecting rod having a third end and a fourth end, the third end being rotatably connected to the fourth section, the fourth end being located in front of the third end in the front-rear direction of the folding frame and being connected to the front wheel of the folding frame, and the second end and the fourth end being spaced apart in the front-rear direction of the folding frame.

[0006] According to the folding frame of the utility model, the rear link is connected between the first section and the fourth section of the armrest push rod, and the front link is connected to the fourth section of the armrest push rod. When the armrest push rod is pressed down toward the rear link at the first section, the armrest push rod can rotate around the first end, and the fourth section moves upward around the first end. The fourth section drives the third end of the front link to move upward, and the front link rotates around the third end toward the rear link under the action of its own gravity, thereby realizing the storage of the armrest push rod toward the rear link, and realizing the storage of the front link toward the rear link. The overall structure is simple, the production cost is low, the operating steps during storage are few, the storage is convenient, and the space occupied after storage is small.

[0007] According to some embodiments of the utility model, the folding frame further includes: a bottom connecting rod, which is located below the fourth section and extends along the front-to-rear direction of the folding frame, the bottom connecting rod is rotatably connected to the rear connecting rod, and the bottom connecting rod is rotatably connected to the front connecting rod.

[0008] According to some embodiments of the present invention, the bottom connecting rod is connected to the rear wheel of the folding frame, the second end is located in front of the rotation center of the rear wheel, and the second end is rotatably connected to the bottom connecting rod.

[0009] According to some embodiments of the utility model, the connection point where the bottom link is connected to the front link is the first rotation point, and the connection point where the bottom link is connected to the rear link is the second rotation point. In the height direction of the folding frame, the first rotation point is located on the side of the second rotation point close to the armrest push rod.

[0010] According to some embodiments of the present invention, the front link, the rear link and the bottom link are two symmetrically arranged in the width direction of the folding frame, and the folding frame further includes: a bottom support cross bar, which extends along the width direction of the folding frame and is connected between the two bottom links, and in the front-to-back direction of the folding frame, the bottom support cross bar is located at the front side of the first end.

[0011] In some embodiments of the utility model, the two front connecting rods are symmetrically arranged in the width direction of the folding frame, and the spacing between the two fourth ends in the width direction of the folding frame is a first spacing; the two rear connecting rods are symmetrically arranged in the width direction of the folding frame, and the spacing between the two second ends in the width direction of the folding frame is a second spacing; the symmetry plane of the two front connecting rods is the same as the symmetry plane of the two rear connecting rods; wherein, the first spacing is smaller than the second spacing; or, the first spacing is larger than the second spacing.

[0012] In some embodiments of the present invention, the first spacing is smaller than the second spacing, there is one front wheel and two rear wheels, a transverse axis is connected between the two rear wheels, the transverse axis has an avoidance portion and a wheel axle portion, the avoidance portion protrudes toward the handrail push rod and forms an avoidance gap opening downward, there are two wheel axle portions and are respectively connected to both sides of the avoidance portion in the width direction of the folding frame, each wheel axle portion is connected to the rear wheel on the corresponding side; the width of the avoidance gap in the width direction of the folding frame is greater than the width of the front wheel in the width direction of the folding frame.

[0013] In some embodiments of the present invention, the avoidance portion is connected to a side of the wheel axle portion away from the front wheel.

[0014] According to some optional embodiments of the utility model, the folding frame also includes: a locking mechanism, the locking mechanism includes a first locking portion, a second locking portion, a rotating shaft and a locking piece, the first locking portion is connected between the first section and the fourth section, the second locking portion is connected to the first end, the first locking portion has a first rotating hole and a first locking hole, the second locking portion has a second rotating hole and a second locking hole, the rotating shaft is passed through the first rotating hole and the second rotating hole, and the first locking portion is rotatable relative to the second locking portion around the central axis of the rotating shaft; the locking piece has a locking position and an unlocking position, in the locking position, the locking piece is passed through the first locking hole and the second locking hole; in the unlocking position, the locking piece at least disengages from one of the first locking hole and the second locking hole.

[0015] In some optional embodiments of the present invention, the second locking portion is located at the outer side of the first locking portion, the first locking hole is a blind hole opening toward the second locking portion, the second locking hole is a blind hole opening toward the first locking portion, and an unlocking hole connected to the second locking hole is provided on the bottom wall of the second locking hole; the locking mechanism also includes an elastic member and an unlocking button, in the width direction of the folding frame, the elastic member is located at an end of the locking member away from the second locking portion, and a part of the unlocking button is penetrated through the unlocking hole; in the locked position, the locking member abuts against the bottom wall of the second locking hole, and the elastic member is in a first compression deformation state; in the unlocking position, the unlocking button abuts against the locking member, the locking member is disengaged from the two locking holes, the elastic member is in a second compression deformation state, and the energy stored in the second compression deformation state of the elastic member is greater than the energy stored in the first compression deformation state of the elastic member.

[0016] A folding trolley according to an embodiment of the second aspect of the utility model comprises: a folding frame according to an embodiment of the first aspect of the utility model.

[0017] According to the folding trolley of the utility model, by providing the above-mentioned folding frame, the overall structure is simple, the production cost is low, the operation steps during storage are few, the storage is convenient, and the occupied space after storage is small.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a perspective view of a folding trolley according to some embodiments of the utility model;

[0021] Figure 2 yes Figure 1 A three-dimensional image of the foldable trolley from another perspective;

[0022] Figure 3 yes Figure 1 A side view of a folding trolley in FIG.

[0023] Figure 4 yes Figure 1 Schematic diagram of the local structure of the folding trolley.

[0024] Reference numerals:

[0025] 100. Folding trolley;

[0026] 10. Folding frame;

[0027] 1. Handrail push rod; 11. First section; 12. Second section; 13. Third section; 14. Fourth section;

[0028] 2. rear connecting rod; 21. first end; 22. second end; 23. second rotation point;

[0029] 3. front connecting rod; 31. third end; 32. fourth end; 33. first rotation point;

[0030] 41. bottom connecting rod; 42. bottom supporting cross bar;

[0031] 5. Locking mechanism; 51. First locking part; 511. First rotating hole; 512. First locking hole; 52. Second locking part; 521. Second rotating hole; 522. Second locking hole; 523. Unlocking hole; 54. Locking member; 56. Unlocking button; 561. Press outer cover; 562. Unlocking column;

[0032] 61, rear wheel; 62, transverse axis; 621, avoidance portion; 6211, avoidance gap; 622, axle portion; 63, front wheel;

[0033] 71. Plate rack; 72. Ceiling frame. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] The folding frame 10 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0036] Reference Figure 1-Figure 4 According to the folding frame 10 of the embodiment of the utility model, the armrest push rod 1, the rear link 2 and the front link 3 are included. The armrest push rod 1 is connected to the first section 11 and the fourth section 14; the rear link 2 has a first end 21 and a second end 22, and the first end 21 is rotatably connected between the first section 11 and the fourth section 14, that is, the first end 21 is connected to the middle position of the armrest push rod 1. For example, the armrest push rod 1 has a second section 12 and a third section located between the first section 11 and the fourth section, and the first section 11, the second section 12, the third section 13 and the fourth section 14 are connected in sequence, and the first end 21 is rotatably connected to the third section 13.

[0037] The second end 22 is connected to the rear wheel 61 of the folding frame 10; the front link 3 has a third end 31 and a fourth end 32, the third end 31 is rotatably connected to the fourth section 14, and in the front-to-back direction of the folding frame 10, the fourth end 32 is located in front of the third end 31, and the fourth end 32 is connected to the front wheel 63 of the folding frame 10, and the second end 22 is spaced apart from the fourth end 32 in the front-to-back direction of the folding frame 10.

[0038] When the folding frame 10 is stored, the armrest push rod 1 can be pressed down from the first section 11 toward the rear link 2 to drive the armrest push rod 1 to rotate around the first end 21. Since the first end 21 of the rear link 2 is connected to the second end 22 of the armrest push rod 1, when the armrest push rod 1 rotates around the first end 21, the first section 11 moves downward around the first end 21, and the fourth section 14 moves upward around the first end 21, and the fourth section 14 drives the third end 31 of the front link 3 to move upward.

[0039] Since the fourth end 32 of the front link 3 is located in front of the third end 31 and the center of gravity of the front link 3 is located in front of the fourth end 32, when the fourth section 14 drives the third end 31 of the front link 3 to move upward, the gravity of the front link 3 itself has a component force toward the rear link 2, and the front link 3 rotates around the third end 31 toward the rear link 2 under the action of the component force.

[0040] In this way, the armrest push rod 1 can be stored toward the rear link 2, and the front link 3 can be stored toward the rear link 2. The components are few and the overall structure is simple, which can effectively improve the production efficiency of the folding frame 10 and reduce the production cost of the folding frame 10. At the same time, when storing, the armrest push rod 1 can be forced only in the first section 11 to realize the storage of the folding frame 10. The operation steps during storage are few, the storage is convenient, and the space occupied after storage is small.

[0041] Since the armrest push rod 1 is connected to the third section 13, and the second section 12 is spaced between the first section 11 and the third section 13, by applying force to the armrest push rod 1 at the first section 11, the distance between the force application point and the first end 21 is longer, so that the force arm when applying force can be longer, so that the user does not need to apply a large force to drive the armrest push rod 1 to rotate, thereby meeting the user's demand for labor saving.

[0042] According to the folding frame 10 of the utility model, the rear link 2 is connected between the first section 11 and the fourth section 14 of the armrest push rod 1, and the front link 3 is connected to the fourth section 14 of the armrest push rod 1. When the armrest push rod 1 is pressed down toward the rear link 2 at the first section 11, the armrest push rod 1 can rotate around the first end 21, and the fourth section 14 moves upward around the first end 21. The fourth section 14 drives the third end 31 of the front link 3 to move upward, and the front link 3 rotates around the third end 31 toward the rear link 2 under the action of its own gravity, thereby realizing the storage of the armrest push rod 1 toward the rear link 2, and realizing the storage of the front link 3 toward the rear link 2. The overall structure is simple, the production cost is low, the operating steps during storage are few, the storage is convenient, and the space occupied after storage is small.

[0043] Reference Figure 1-Figure 3 According to some embodiments of the present invention, the folding frame 10 further includes: a bottom link 41, the bottom link 41 is located below the fourth section 14, and the bottom link 41 extends along the front and rear direction of the folding frame 10, the bottom link 41 is rotatably connected to the rear link 2, and the bottom link 41 is rotatably connected to the front link 3.

[0044] By setting the bottom link 41, the bottom link 41 can limit the distance between the front link 3 and the rear link 2. When the folding frame 10 is opened, the distance between the second end 22 and the fourth end 32 in the front-to-back direction can be opened to a preset value, so that the angle between the unfolded front link 3 and the rear link 2 can be opened to a preset angle, so that the folding frame 10 can be reliably opened.

[0045] When the folding frame 10 is subjected to force (for example, when a baby is riding in the folding frame 10, or when personal belongings are placed in the folding frame 10), the fourth end 32 can be prevented from moving in a direction away from the second end 22 due to the force on the front link 3, and the second end 22 can be prevented from moving in a direction away from the fourth end 32 due to the force on the rear link 2, so that the distance between the second end 22 and the fourth end 32 in the front-to-back direction is maintained at a preset value, and the angle between the front link 3 and the rear link 2 is maintained at a preset angle, thereby improving the reliability of the folding frame 10.

[0046] Reference Figure 1-Figure 3According to some embodiments of the present invention, the bottom link 41 is connected to the rear wheel 61 of the folding frame 10, the second end 22 is located in front of the rotation center of the rear wheel 61, and the second end 22 is rotatably connected to the bottom link 41. The connection point between the bottom link 41 and the front link 3 is the first rotation point 33, and the connection point between the bottom link 41 and the rear link 2 is the second rotation point 23.

[0047] When the armrest push rod 1 is pressed downward from the first section 11 toward the rear link 2, the fourth section 14 can drive the third end 31 of the front link 3 to move upward, and the front link 3 has a tendency to move upward. When downward pressure is applied to the armrest push rod 1 through the first section 11, the downward pressure can be transmitted to the bottom link 41 through the first end 21, so that the bottom link 41 has a tendency to rotate around the center of gravity of the rear wheel 61. The bottom link 41 can apply a downward force to the front link 3. When the fourth section 14 drives the third end 31 of the front link 3 to move upward, the front link 3 can rotate around the first rotation point 33, so that the front wheel 63 can slide or roll against the bottom surface toward the rear wheel 61.

[0048] When the folding frame 10 is stored, the front wheel 63 can be prevented from leaving the ground, causing the folding frame 10 to roll with only the rear wheel 61 touching the ground, so that both the front wheel 63 and the rear wheel 61 can touch the ground reliably, so that the front wheel 63 and the rear wheel 61 can form a good supporting effect, so that the folding frame 10 can maintain a relatively stable posture when stored. When the user presses down the armrest push rod 1, the folding frame 10 can be prevented from rolling around and causing the user to be shaken and fall, thereby effectively ensuring the safety of the user, facilitating the storage of the folding frame 10, and improving the overall performance of the folding frame 10.

[0049] Reference Figure 1-Figure 3 According to some embodiments of the utility model, the connection point where the bottom link 41 is connected to the front link 3 is the first rotation point 33, and the connection point where the bottom link 41 is connected to the rear link 2 is the second rotation point 23. In the height direction of the folding frame 10, the first rotation point 33 is located on the side of the second rotation point 23 close to the armrest push rod 1.

[0050] Compared with setting the first rotation point 33 and the second rotation point 23 to be flush in the height direction of the folding frame 10 or setting the first rotation point 33 on the side of the second rotation point 23 away from the armrest push rod 1, this can make the angle formed by the line between the first rotation point 33 and the rotation center point of the rear wheel 61 and the horizontal plane larger.

[0051] When the handrail push rod 1 is pressed downward from the first section 11 toward the rear link 2 and the handrail push rod 1 drives the front wheel 63 to move backward through the front link 3, the direction of the force applied by the front wheel 63 to the bottom link 41 at the first rotation point 33 through the front link 3 is larger than the angle formed by the line between the first rotation point 33 and the rotation center point of the rear wheel 61, so that the force applied by the front wheel 63 at the first rotation point 33 has a larger component in the direction perpendicular to the line between the first rotation point 33 and the rotation center point of the rear wheel 61. , so that the front wheel 63 applies a larger torque to the bottom link 41 through the front link 3 at the first rotation point 33, so that the fourth section 14 can reliably drive the front link 3 to rise, avoiding the folding frame 10 from getting stuck during the storage process, so that the folding frame 10 can be reliably stored, thereby improving the reliability of the folding frame 10; at the same time, when the user applies downward pressure to the first section 11 to fold the folding frame 10, this can prevent the user from having to use too much force, thereby facilitating the user to store the folding frame 10.

[0052] Reference Figure 1-Figure 3 According to some embodiments of the present invention, the front link 3, the rear link 2 and the bottom link 41 are two symmetrically arranged in the width direction of the folding frame 10. The folding frame 10 also includes: a bottom support cross bar 42, which extends along the width direction of the folding frame 10, and the bottom support cross bar 42 is connected between the two bottom links 41. In the front and rear direction of the folding frame 10, the bottom support cross bar 42 is located at the front side of the first end 21.

[0053] The bottom supporting cross bar 42 can limit the two bottom connecting rods 41 in the width direction of the folding frame 10, so that the two bottom connecting rods 41 can be reliably positioned in the width direction of the folding frame 10, thereby limiting the front connecting rod 3 and the rear connecting rod 2 in the width direction of the folding frame 10 through the bottom connecting rod 41, so that the two front connecting rods 3 and the two rear connecting rods 2 can be reliably positioned in the width direction of the folding frame 10, thereby strengthening the structural strength of the folding frame 10 and improving the reliability of the folding frame 10.

[0054] Reference Figure 1-Figure 3 In some embodiments of the utility model, the front links 3 are two symmetrically arranged in the width direction of the folding frame 10, and the spacing between the two fourth ends 32 in the width direction of the folding frame 10 is a first spacing. The rear links 2 are two symmetrically arranged in the width direction of the folding frame 10, and the spacing between the two second ends 22 in the width direction of the folding frame 10 is a second spacing. The symmetry plane of the two front links 3 is the same as the symmetry plane of the two locking bolt rear links 2; wherein the first spacing is smaller than the second spacing; or, the first spacing is larger than the second spacing.

[0055] It should be understood that the folding cart 100 has two wheel structure forms: a four-wheel cart and a three-wheel cart. When the folding cart 100 is a four-wheel cart, there are two front wheels 63 and two rear wheels 61. The two front wheels 63 are respectively connected to the two front connecting rods 3, and the two rear wheels 61 are respectively connected to the two rear connecting rods 2. At this time, the first spacing is smaller than the second spacing, that is, the distance between the two front wheels 63 is smaller than the distance between the two rear wheels 61; the first spacing is larger than the second spacing, that is, the distance between the two front wheels 63 is larger than the distance between the two rear wheels 61.

[0056] When the folding trolley 100 is a three-wheeled trolley, the front wheel 63 can be set to one, the rear wheel 61 can be set to two, and the two front connecting rods 3 are respectively connected to the two sides in the width direction of the front wheel 63, that is, the fourth ends 32 of the two front connecting rods 3 are contracted toward the inside. At this time, the first spacing refers to the width of the front wheel 63, and the second spacing refers to the distance between the two rear wheels 61. When the folding trolley 100 is a three-wheeled trolley, the front wheel 63 can be set to two, the rear wheel 61 can be set to one, and the two rear connecting rods 3 are respectively connected to the two sides in the width direction of the rear wheel 61, that is, the second ends 22 of the two rear connecting rods 3 are contracted toward the inside. At this time, the first spacing refers to the distance between the two front wheels 63, and the second spacing refers to the width of the rear wheel 61.

[0057] That is, when the first spacing is smaller than the second spacing, and the folding cart 100 is a three-wheeled cart, the folding cart 100 has one front wheel 63 and two rear wheels 61. When the first spacing is larger than the second spacing, and the folding cart 100 is a three-wheeled cart, the folding cart 100 has two front wheels 63 and one rear wheel 61.

[0058] When the first spacing is smaller than the second spacing, when the front wheel 63 slides toward the rear wheel 61, the two front links 3 can be inserted into the space between the two rear links 2, so that the front wheel 63 can be inserted into the space between the two rear links 2, so that the folding frame 10 in the stored state is smaller in the front-to-back direction, thereby reducing the space occupied by the folding frame 10 in the stored state.

[0059] When the first spacing is greater than the second spacing, it only means that when the front wheel 63 slides toward the rear wheel 61, the two rear links 2 can be inserted into the space between the two front links 3, so that the rear wheel 61 can be inserted into the space between the two front links 3, so that the folding frame 10 in the stored state is smaller in the front-to-back direction, thereby reducing the space occupied by the folding frame 10 in the stored state.

[0060] Reference Figure 1-Figure 3In some embodiments of the present invention, the first spacing is smaller than the second spacing, there is one front wheel 63, there are two rear wheels 61, a transverse axis 62 is connected between the two rear wheels 61, the transverse axis 62 has an avoidance portion 621 and a wheel axle portion 622, the avoidance portion 621 protrudes toward the handrail push rod 1, and the avoidance portion 621 forms an avoidance gap 6211 opening downward, there are two wheel axle portions 622, and the two wheel axle portions 622 are respectively connected to the avoidance portion 621 on both sides in the width direction of the folding frame 10, and each wheel axle portion 622 is connected to the rear wheel 61 on the corresponding side; the width of the avoidance gap 6211 in the width direction of the folding frame 10 is greater than the width of the front wheel 63 in the width direction of the folding frame 10.

[0061] When the front wheel 63 slides toward the rear wheel 61, the two front links 3 can be inserted into the space between the two rear links 2, and the front wheel 63 can be inserted into the avoidance gap 6211, so that the folding frame 10 in the stored state can be smaller in the front and rear directions, reducing the space occupied by the folding frame 10 in the stored state.

[0062] Reference Figure 1-Figure 3 In some embodiments of the present invention, the avoidance portion 621 is connected to the side of the wheel shaft portion 622 away from the front wheel 63. In this way, the front wheel 63 can be inserted between the two rear wheels 61 as much as possible, thereby further reducing the size of the folding frame 10 in the storage state in the front and rear direction, making the folding frame 10 in the storage state more compact.

[0063] Reference Figure 4 According to some optional embodiments of the utility model, the folding frame 10 also includes: a locking mechanism 5, the locking mechanism 5 includes a first locking portion 51, a second locking portion 52, a rotating shaft and a locking member 54, the first locking portion 51 is connected between the first section 11 and the fourth section 14, for example, the first locking portion 51 can be connected to the third section 13.

[0064] The second locking portion 52 is connected to the first end 21. The first locking portion 51 has a first rotating hole 511 and a first locking hole 512. The second locking portion 52 has a second rotating hole 521 and a second locking hole 522. The rotating shaft passes through the first rotating hole 511 and the second rotating hole 521. The first locking portion 51 can rotate relative to the second locking portion 52 around the central axis of the rotating shaft.

[0065] The locking member 54 has a locking position and an unlocking position. In the locking position, the locking member 54 is inserted into the first locking hole 512 and the second locking hole 522, that is, a portion of the locking member 54 is located in the first locking hole 512, and the other portion is located in the second locking hole 522. In the unlocking position, the locking member 54 is at least separated from one of the first locking hole 512 and the second locking hole 522; that is, in the locking position, the locking member 54 can be completely located in the first locking hole 512, or the locking member 54 can be completely located in the second locking hole 522, and there is no locking member 54 in either the first locking hole 512 or the second locking hole 522.

[0066] When the folding frame 10 is needed, after the distance between the second end 22 and the fourth end 32 in the front-to-back direction is opened to a preset value and the angle between the front link 3 and the rear link 2 is opened to a preset angle, the locking member 54 can be inserted into the first rotating hole 511 and the second rotating hole 521 to lock the relative position of the first locking portion 51 and the second locking portion 52, so that the distance between the second end 22 and the fourth end 32 in the front-to-back direction is maintained at a preset value, and the angle between the front link 3 and the rear link 2 is maintained at a preset angle.

[0067] When the folding frame 10 needs to be stored, the first locking member 54 and the second locking member 54 can be rotated relative to each other by pulling the locking member 54 out of the first rotating hole 511, or by pulling the locking member 54 out of the second rotating hole 521, or by pulling the locking member 54 out of the first rotating hole 511 and the second rotating hole 521, so that the user can drive the armrest push rod 1 to rotate around the first end 21 by pressing down the first section 11. The structure is simple and easy to use.

[0068] Reference Figure 4 In some optional embodiments of the present invention, the second locking portion 52 is located outside the first locking portion 51, the first locking hole 512 is a blind hole opening toward the second locking portion 52, the second locking hole 522 is a blind hole opening toward the first locking portion 51, and an unlocking hole 523 communicating with the second locking hole 522 is formed on the bottom wall of the second locking hole 522;

[0069] The locking mechanism 5 also includes an elastic member and an unlocking button 56. In the width direction of the folding frame 10, the elastic member is located at an end of the locking member 54 away from the second locking portion 52, and part of the unlocking button 56 is passed through the unlocking hole 523; for example, the unlocking button 56 may include a pressing outer cover 561 and an unlocking column 562, the pressing outer cover 561 is located on the outer side of the second locking portion 52, the unlocking column 562 is connected to the pressing outer cover 561, and the unlocking column 562 is passed through the unlocking hole 523.

[0070] In the locked position, the locking member 54 abuts against the bottom wall of the second locking hole 522, and the elastic member is in a first compression deformation state; in the unlocked position, the unlock button 56 abuts against the locking member 54, for example, the unlock button abuts against the locking member 54; the locking member 54 is separated from the second locking hole, and the elastic member is in a second compression deformation state, and the energy stored in the second compression deformation state of the elastic member is greater than the energy stored in the first compression deformation state of the elastic member. For example, the elastic member can be a rubber member, or a spring.

[0071] By setting the first locking hole 512 and the second locking hole 522 as blind holes, in the locked state, the locking member 54 is inserted into the first locking hole 512 and the second locking hole 522, which can effectively prevent the locking member 54 from falling off from the first locking hole 512 and the second locking hole 522, so that the locking member 54 can reliably lock the first locking portion 51 and the second locking portion 52. In the unlocked state, the locking member 54 is located in the first locking hole 512, and the first locking hole 512 can store the locking member 54, preventing the locking member 54 from being lost, thereby improving the reliability of the folding frame 10.

[0072] In the locked state, the elastic member is set to a compressed deformation state, so that the elastic member can always keep the locking member 54 in a force state, so that the locking member 54 can be reliably inserted between the first locking hole 512 and the second locking hole 522, effectively preventing the folding frame 10 from folding during use, thereby improving the reliability of the folding frame 10.

[0073] The second locking portion 52 is arranged on the outside of the first locking portion 51, and part of the unlocking button 56 is passed through the unlocking hole 523, so that the unlocking button 56 can be pressed directly from the outside, effectively avoiding interference of the front link 3, the rear link 2 or the internal structure of the folding frame 10 with the unlocking button 56, making it convenient for the user to press the unlocking button 56 to unlock the locking structure.

[0074] Reference Figure 1-Figure 4 According to the folding trolley 100 of the second embodiment of the utility model, it includes: the folding frame 10 of the first embodiment of the utility model. For example, the folding trolley 100 may also include a plate rack 71, which extends along the width direction of the folding trolley 100, and the plate rack 71 is respectively connected to the two front connecting rods 3 to prevent the plate rack 71 from rotating at a large angle, which may cause the items in the plate rack 71 to fall, so that the folding trolley 100 after storage can still use the plate rack 71 to hold items. For example, the folding trolley 100 may also include a ceiling group, the ceiling group includes a ceiling frame 72 and a ceiling cloth, the ceiling frame 72 is arc-shaped and the two ends are rotatably connected to the handrail push rod 1, so that the ceiling group can be folded toward the handrail push rod 1.

[0075] According to the folding trolley 100 of the utility model, by providing the above-mentioned folding frame 10, the overall structure is simple, the production cost is low, the operation steps during storage are few, the storage is convenient, and the occupied space after storage is small.

[0076] In the description of the present utility model, it is to be understood that relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0077] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0079] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A folding frame, characterized in that: include: A handrail push rod having a first section and a fourth section connected thereto; a rear link having a first end and a second end, wherein the first end is rotatably connected between the first section and the fourth section, and the second end is connected to a rear wheel of the folding frame; The front link has a third end and a fourth end, the third end is rotatably connected to the fourth section, the fourth end is located in front of the third end in the front-rear direction of the folding frame and is connected to the front wheel of the folding frame, and the second end is spaced from the fourth end in the front-rear direction of the folding frame.

2. The folding frame according to claim 1, characterized in that: Also includes: The bottom connecting rod is located below the fourth section and extends along the front-rear direction of the folding frame. The bottom connecting rod is rotatably connected to the rear connecting rod, and the bottom connecting rod is rotatably connected to the front connecting rod.

3. The folding frame according to claim 2, characterized in that: The bottom connecting rod is connected to the rear wheel of the folding frame, the second end is located in front of the rotation center of the rear wheel, and the second end is rotatably connected to the bottom connecting rod.

4. The folding frame according to claim 2, characterized in that: The connection point between the bottom link and the front link is the first rotation point, and the connection point between the bottom link and the rear link is the second rotation point. In the height direction of the folding frame, the first rotation point is located on the side of the second rotation point close to the armrest push rod.

5. The folding frame according to claim 2, characterized in that: The front link, the rear link and the bottom link are two links symmetrically arranged in the width direction of the folding frame. The folding frame further comprises: a bottom supporting cross bar, which extends along the width direction of the folding frame and is connected between the two bottom connecting rods. In the front-rear direction of the folding frame, the bottom supporting cross bar is located at the front side of the first end.

6. The folding frame according to claim 1, characterized in that: The front connecting rods are two symmetrically arranged in the width direction of the folding frame, the two fourth ends are spaced apart at a first distance in the width direction of the folding frame, the rear connecting rods are two symmetrically arranged in the width direction of the folding frame, the two second ends are spaced apart at a second distance in the width direction of the folding frame, and the symmetry plane of the two front connecting rods is the same as the symmetry plane of the two rear connecting rods; Wherein, the first spacing is smaller than the second spacing; or, the first spacing is larger than the second spacing.

7. The folding frame according to claim 6, characterized in that: The first spacing is smaller than the second spacing, there is one front wheel and two rear wheels, a transverse axis is connected between the two rear wheels, the transverse axis has an avoidance portion and a wheel axle portion, the avoidance portion protrudes toward the handrail push rod and forms an avoidance gap opening downward, there are two wheel axle portions and are respectively connected to both sides of the avoidance portion in the width direction of the folding frame, and each wheel axle portion is connected to the rear wheel on the corresponding side; The width of the avoidance gap in the width direction of the folding frame is greater than the width of the front wheel in the width direction of the folding frame.

8. The folding frame according to claim 1, characterized in that: Also includes: A locking mechanism, the locking mechanism comprising a first locking portion, a second locking portion, a rotating shaft and a locking member, the first locking portion being connected between the first section and the fourth section, the second locking portion being connected to the first end, the first locking portion having a first rotating hole and a first locking hole, the second locking portion having a second rotating hole and a second locking hole, the rotating shaft being inserted through the first rotating hole and the second rotating hole, the first locking portion being rotatable relative to the second locking portion around a central axis of the rotating shaft; The locking member has a locking position and an unlocking position. In the locking position, the locking member is inserted into the first locking hole and the second locking hole. In the unlocking position, the locking member is disengaged from at least one of the first locking hole and the second locking hole.

9. The folding frame according to claim 8, characterized in that: The second locking portion is located outside the first locking portion, the first locking hole is a blind hole opening toward the second locking portion, the second locking hole is a blind hole opening toward the first locking portion, and an unlocking hole communicating with the second locking hole is formed on the bottom wall of the second locking hole; The locking mechanism further comprises an elastic member and an unlocking button, wherein in the width direction of the folding frame, the elastic member is located at an end of the locking member away from the second locking portion, and a portion of the unlocking button is penetrated through the unlocking hole; In the locked position, the locking member abuts against the bottom wall of the second locking hole, and the elastic member is in a first compression deformation state; in the unlocked position, the unlocking button abuts against the locking member, the locking member is disengaged from the two locking holes, and the elastic member is in a second compression deformation state, and the energy stored in the second compression deformation state of the elastic member is greater than the energy stored in the first compression deformation state of the elastic member.

10. A foldable trolley, characterized in that: include: A folding frame according to any one of claims 1 to 9.

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