Dual-purpose trailer for twins and shopping

Abstract

The utility model discloses a dual-purpose trailer for twins and shopping, which comprises a frame, swing protection frames, a push-pull rod and a moving component, a plurality of groups of swing protection frames are arranged above the frame and surround the top of the frame, each group of swing protection frame is rotatably connected with the frame, and the push-pull rod is arranged on the frame. The adjacent swing protection frames are spliced through a splicing structure; each moving assembly is rotationally connected with the frame, a first locking assembly is arranged between each moving assembly and the frame, and a push-pull rod is installed at the rear end of the frame through a large joint. The swing protection frame, the push-pull rod and the moving assembly of the trailer can be folded, so that the occupied space is reduced, and the trailer is convenient to carry.

Description

Technical Field

[0001] The utility model relates to the field of trailers, in particular to a dual-purpose trailer for twins and shopping. Background Art

[0002] The baby trailers currently on the market cannot be folded, which makes storage inconvenient. When being stored, the baby trailers take up a large space, which makes it inconvenient to carry and store. At the same time, the folding trailers currently have multiple unlocking mechanisms, so each time a structure is folded, a part needs to be unlocked. In this way, when folding, multiple unlocking mechanisms are required, which is cumbersome. At the same time, the current moving components cannot be folded, which results in a relatively high height of the folded folding parts and a high space required for placing the baby trailer. At the same time, the moving components cannot be folded, so the baby trailer can be moved when placed. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the invention proposes a dual-purpose trailer for twins and shopping, which can realize the folding of the swing protection frame, push-pull rods and mobile components of the trailer, thus reducing the occupied space and facilitating carrying.

[0004] To achieve the above-mentioned object, the present invention provides a dual-purpose trailer for twins and shopping carts, comprising a frame, a swing protection frame, a push-pull rod, and a moving assembly, wherein a plurality of sets of swing protection frames are provided above the frame, the plurality of sets of swing protection frames enclosing the top of the frame, each set of swing protection frames being rotatably connected to the frame, and adjacent swing protection frames being spliced ​​together by a splicing structure;

[0005] Two groups of moving assemblies are provided at the bottom of the frame and are mounted on both sides of the frame, each group of moving assemblies is rotatably connected to the frame, and a first locking assembly is provided between the moving assembly and the frame;

[0006] A push-pull rod is installed at the rear end of the frame through a large joint, a second locking assembly is arranged in the large joint, the first locking assembly is linked to the second locking assembly, and an unlocking block for unlocking the second locking assembly is arranged on the push-pull rod.

[0007] Preferably, the large joint includes a fixed seat, a rotating seat and a pin shaft. The fixed seat is installed on the frame. A groove for installing the rotating seat is opened on the fixed seat. A coaxial pin shaft is installed on the rotating seat. The pin shaft passes through the fixed seat and is rotatably connected to the rotating seat. The rotating seat is connected to the push-pull rod. A first cable is arranged between the rotating seat and the first locking assembly. Both ends of the first cable are installed on the rotating seat and the first locking assembly. One end of the first cable moves back and forth with the rotation of the rotating seat. When the push-pull rod swings and fits the top of the frame, the first cable pulls the first locking assembly to unlock.

[0008] Preferably, an arc-shaped groove is opened on the side of the fixed seat facing the rotating seat, and the distances from the two ends of the arc-shaped groove to the vehicle frame are inconsistent. A moving block is provided in the arc-shaped groove for moving in the arc-shaped groove, and the moving block is connected to the rotating seat and rotates synchronously. The moving block is connected to the first cable, and a clearance groove for the first cable to extend into is provided at the bottom of the arc-shaped groove, and the clearance groove passes through the fixed seat, and the first cable extends into the clearance groove and is connected to the rotating seat.

[0009] Preferably, the arc-shaped groove is a semicircular arc-shaped groove, and both ends of the arc-shaped groove are arranged horizontally.

[0010] Preferably, the second locking assembly includes a limit block and a limit groove, the push-pull rod and the rotating seat are provided with a cavity for embedding the limit block, and a limit groove for embedding the limit block is provided at the bottom of the groove of the fixed seat. A first spring is arranged between the limit block and the inner wall of the push-pull rod. The first spring makes the limit block protrude from the bottom of the outer wall of the rotating seat and the limit block extends into the limit groove. A second cable is installed at the top of the limit rod, and the top of the second cable is installed on the unlocking block. The unlocking block is sleeved on the push-pull rod and slides up and down.

[0011] Preferably, the moving assembly includes a front wheel group and a rear wheel group, a linkage rod is embedded in the frame and the linkage rod is rotatably connected to the inside of the frame, both ends of the linkage rod are fixed to the front wheel group and the rear wheel group respectively, the front wheel group and the rear wheel group both include a rotating block and a tire, and a first locking assembly for locking the rotating block of the rear wheel seat is installed on the frame, the first locking assembly is located on the side of the rear wheel group away from the push-pull rod, and a notch is opened on the frame, the rotating block passes through the notch on the frame and is fixedly connected to the linkage rod, and a tire is installed on the bottom of the rotating block; a groove body for the first locking assembly to extend into is opened on the side of the rotating block facing the first locking assembly, and the first locking assembly extends into the groove body to realize the locking of the rotating block.

[0012] Preferably, the first locking assembly includes a mounting seat, a locking block and a sliding channel. The mounting seat is installed on the frame, and a sliding channel facing the rotating block is opened on the mounting seat. A groove body connected to the sliding channel is opened on the rotating block of the rear wheel group. A locking block sliding in the sliding channel is embedded in the sliding channel. A fixed block is fixed at the end of the mounting seat away from the rotating block. A second spring is arranged between the fixed block and the locking block. Holes for the first cable to pass through are opened on the outer wall of the mounting seat and the fixed seat. The end of the first cable is installed on the locking block, and the locking block extends into the groove body of the rotating block through the two springs.

[0013] Preferably, a brake pedal is installed on the fixed seat, the brake pedal is hinged at the bottom of the fixed seat, a wire groove is installed at the bottom of the fixed seat, a brake assembly is installed on each set of moving mechanisms, a third cable is connected to the brake assembly, and the third cable passes through the wire groove to be connected to the brake pedal.

[0014] Preferably, a third locking assembly is installed on the two sets of oppositely arranged swing guard frames, and the position of the swing guard frames is locked by the third locking assembly; the swing guard frame is made of a hollow tube, a rotating shaft is fixed on the frame, a sleeve is sleeved on the rotating shaft, and the swing guard frame is installed on the sleeve, and the third locking assembly is embedded in the top pipes of the front and rear sets of swing guard frames, and the third locking assembly includes a locking pin and a fourth cable, and notches are opened at both ends of the top pipes of the front and rear sets of swing guard frames, and locking pins are embedded in the notches, and locking grooves for the locking pins to be embedded are opened on the inner sides of the two ends of the left and right sets of swing guard frames, and the tail of the locking pin extends into the locking grooves of the left and right sets of swing guard frames, and a third spring is provided between the locking pin and the inside of the swing guard frame, and a pullable unlocking handle is installed on the top of the swing guard frame, and the unlocking handle is connected to the fourth cable.

[0015] Preferably, the brake assembly is installed on the inner side of the moving assembly, and locking holes distributed in a circular array are opened on the inner wall of the moving assembly; the brake assembly includes a locking block, a locking pin, a second spring and a pushing assembly, the locking block faces the moving assembly, a cross groove is opened on the locking block, and the pushing assembly is embedded in the cross groove, the pushing assembly includes a sliding plate and a locking plate, an embedding groove is installed on the sliding plate, the locking plate is embedded in the embedding groove of the sliding plate, an oblique groove is provided on the side of the sliding plate facing the moving assembly, an oblique block that fits with the oblique surface of the oblique groove is stuck in the oblique groove, the oblique block is fixed to the locking plate, a locking pin is fixed at one end of the locking plate facing the moving assembly, the locking pin is also located in the cross groove, a fourth spring is sleeved on the locking pin, and the two ends of the fourth spring are respectively fixed on the locking pin and the inner wall of the cross groove.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The trailer's swing guard, push-pull rods and moving components can be folded to reduce space and facilitate portability.

[0018] One-touch unlocking and folding is achieved, making it easy to fold quickly;

[0019] The push-pull rod can swing, so it can be used as a push rod or a pull rod;

[0020] The trailer has a large space and can be used to place twin babies or for shopping. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a left view of the present invention.

[0022] Figure 2 It is a bottom view of the present invention.

[0023] Figure 3 It is a top view of the present invention.

[0024] Figure 4 It is a three-dimensional view of the present invention.

[0025] Figure 5 Schematic diagram of the push-pull rod, the limit block and the second cable of the present invention.

[0026] Figure 6 It is a schematic diagram of the limit block, the first spring and the second cable of the present invention.

[0027] Figure 7 It is a cross-sectional view of the fixing seat, rotating seat and limiting block of the present invention.

[0028] Figure 8 Schematic diagram of the fixing seat, the first cable and the clearance groove of the present invention.

[0029] Figure 9 Schematic diagram of the frame of the present invention.

[0030] Figure 10 Schematic diagram of the rotating block and linkage rod of the front wheel assembly of the present invention.

[0031] Figure 11 This is a schematic diagram of the positions of the first locking assembly and the brake assembly of the present invention.

[0032] Figure 12 Schematic diagram of the rear wheel assembly rotating seat, a locking assembly and a brake assembly of the present invention.

[0033] Figure 13 Schematic diagram of the back side of the brake pedal of the present invention.

[0034] Figure 14 This is a schematic diagram of the first locking assembly of the present invention with half of the outer shell removed.

[0035] Figure 15 This is a schematic diagram of the brake assembly of the present invention with half of the outer shell removed.

[0036] Figure 16 It is a schematic diagram of the coordination between the front and rear swing protection frame and the left and right swing protection frame of the present invention.

[0037] Figure 17 It is a schematic diagram of the front and rear swing protection frame and the third locking assembly of the present invention.

[0038] Figure 18 It is a schematic diagram of the utility model after folding.

[0039] Among them, 1. Frame, 2. Swing protection frame, 3. Push-pull rod, 4. Moving assembly, 5. Front wheel group, 6. Rear wheel group, 7. Linkage rod, 8. Rotating block, 9. Tire, 10. Splicing structure, 11. First locking assembly, 12. Mounting seat, 13. Locking block, 14. Sliding channel, 16. Fixed block, 17. Second spring, 18. First cable, 19. Large joint, 20. Fixed seat, 21. Arc groove, 22. Moving block, 23. Make way groove, 24. Rotating seat, 25. Pin, 26. First spring, 27. Second locking assembly, 28. Limit block , 29. Limiting groove, 31. Unlocking block, 32. Second cable, 33. Brake pedal, 34. Wire groove, 35. Brake assembly, 36. Locking hole, 37. Locking block, 38. Locking ejector pin, 39. Cross groove, 40. Embedded groove, 41. Bevel groove, 42. Bevel block, 43. Fourth spring, 45. Push-out assembly, 46. Third cable, 47. Third locking assembly, 48. Rotating shaft, 49. Sleeve, 50. Locking pin, 51. Fourth cable, 52. Third spring, 53. Locking groove, 54. Unlocking handle, 55. Sliding plate, 56. Locking plate. DETAILED DESCRIPTION

[0040] The present invention will now be further described with reference to the accompanying drawings.

[0041] like Figure 1-18 As shown, a dual-purpose trailer for twins and shopping includes a frame 1, a swing protection frame 2, a push-pull rod 3 and a moving component 4. The frame 1 is composed of a frame and a bracket in the middle of the frame. A plurality of groups of swing protection frames 2 extending downward and upward are arranged above the frame 1. The plurality of swing protection frames 2 surround the top of the frame 1. Each group of swing protection frames 2 is rotatably connected to the frame 1. Adjacent swing protection frames 2 are spliced ​​by a splicing structure 10. The splicing structure 10 is a mortise and tenon structure. The ends of adjacent swing protection frames 2 are spliced ​​by the mortise and tenon structure. When needed, the swing protection frames 2 are swung upward, so that the plurality of swing protection frames 2 form a fence. A baffle is fixed on the inner side of the swing protection frame 2 by rivets. When folding, the mortise and tenon structures between the swing protection frames 2 are opened and swung inward, so that the swing protection frames 2 are fitted with the top of the frame 1.

[0042] Two groups of moving assemblies 4 are provided at the bottom of the frame 1 and are installed on the left and right sides of the frame 1. Each group of moving assemblies 4 is rotatably connected to the frame 1. A first locking assembly 11 is provided between the moving assembly 4 and the frame 1. When it is needed to be used, the moving assembly 4 is swung down to a vertical shape and locked by the first locking assembly 11, so that the moving assembly 4 is always in a vertical state. When it is needed to be folded, the first locking assembly 11 is released from the locking state, and the moving assembly 4 can be rotated and swung inward to fit the bottom of the frame 1, so that the folding of the moving assembly 4 is completed.

[0043] A push-pull rod 3 is installed at the front end of the frame 1 through a large joint 19. The push-pull rod 3 swings through the large joint 19. A second locking component 27 is provided in the large joint 19. The first locking component 11 is linked with the second locking component 27. An unlocking block 31 for unlocking the second locking component 27 is provided on the push-pull rod 3. When it is needed, the push-pull rod 3 is swung outward, and the large joint 19 is locked by the second locking component 27. In this way, the push-pull rod 3 cannot swing, and the frame 1 is dragged to move by the push-pull rod 3. When it is needed to move, When folding, the second locking component 27 unlocks the large joint 19, so that the push-pull rod 3 can swing and fit with the top of the frame 1. When the second locking component 27 is unlocked, the first locking component 11 is unlocked, so that the moving component 4 swings inward to complete the folding. When it needs to be unfolded, the moving component 4 is swung outward into a vertical shape, and then the push-pull rod 3 is swung outward, so that the second locking component 27 locks the push-pull rod 3, and then the first locking component 11 locks the moving component 4 to achieve unfolding and folding.

[0044] The large joint 19 includes a fixed seat 20, a rotating seat 24 and a pin 25. The fixed seat 20 is mounted on the frame 1 by bolts. A groove for mounting the rotating seat 24 is opened on the fixed seat 20. The rotating seat 24 is embedded in the groove. A coaxial pin 25 is installed on the rotating seat 24. The fixed seat 20 on the left and right sides of the rotating seat 24 has a through hole for the pin to pass through. A groove for the end of the pin to extend into is opened at the center position of the left and right sides of the rotating seat. The pin 25 extends into the groove of the rotating seat 24 through the through hole. In this way, the rotating seat 24 rotates around the pin, thereby realizing the rotation of the rotating seat 24. The rotating seat 24 is connected to the push-pull rod 3 (the push-pull rod 3 is a hollow tube, and a through hole is formed on the outer wall of the rotating seat 24). A butt joint is fixed by welding, and the butt joint is directly inserted into the hollow part of the push-pull rod 3, and the butt joint and the push-pull rod 3 are locked by bolts). A first cable 18 is provided between the rotating seat 24 and the first locking assembly 11, and both ends of the first cable 18 are installed on the rotating seat 24 and the first locking assembly 11. There are two first cables 18. The two first cables 18 are located on the left and right sides of the rotating seat 24. One end of the first cable 18 is connected to the eccentric part of the rotating seat 24, and one end of the first cable 18 moves with the rotating seat 24. When the push-pull rod 3 swings and fits the top of the frame 1, the first cable 18 pulls the first locking assembly 11 to unlock, so that the movable assembly 4 can be folded.

[0045] A semicircular arc groove 21 is provided on one side of the fixed seat 20 facing the rotating seat 24. The distances between the two ends of the arc groove 21 and the vehicle frame 1 are inconsistent (the arc groove 21 is arranged horizontally, so that the positions of the two ends of the arc groove 21 to the vehicle frame 1 are inconsistent). A moving block 22 is provided in the arc groove 21 for moving in the arc groove 21. The moving block 22 is a bolt. The moving block 22 is connected to the rotating seat 24 and rotates synchronously. The moving block 22 is connected to the first cable 18 (a pull ring is fixed at one end of the cable by welding, and a bolt hole is provided at the eccentric position of the rotating seat 24. The bolt passes through the pull ring and extends into the rotating shaft 48 The first cable 18 is pulled into the bolt hole so that when the rotating seat 24 rotates, the pull ring moves away from the frame 1, pulling the first cable 18). A clearance groove 23 is provided at the bottom of the arc-shaped groove 21 for the first cable 18 to extend into. The clearance groove 23 passes through the fixed seat 20, and the first cable 18 extends into the clearance groove 23 to connect with the rotating seat 24. When the push-pull rod 3 is folded, that is, the push-pull rod 3 rotates counterclockwise to fit the top of the frame 1, the rotating seat 24 rotates counterclockwise, the pull ring moves away from the frame 1 and pulls the first cable 18 to the right. The first cable 18 unlocks the first locking assembly 11, and then the movable assembly 4 can be folded.

[0046] The arc groove 21 is a semicircular arc groove 21, and the two ends of the arc groove 21 are arranged horizontally. The left end of the arc groove 21 is close to the frame 1 and the right end is away from the frame 1. The arc groove 21 is set at the same time to limit the rotation angle of the rotating seat 24; when the second locking component 27 is unlocked, the rotating seat 24 can rotate. When the rotating seat 24 rotates clockwise, the push-pull rod 3 swings to the lower right, the pull ring moves to the left end of the arc groove 21, and the second locking component 27 is locked, so that one end of the push-pull rod 3 is lowered, which makes it easier for the push-pull rod 3 to be pulled. When the frame 1 needs to be pushed, the second locking assembly 27 is unlocked, the push-pull rod 3 rotates counterclockwise, and the height of the push-pull rod 3 is increased, which makes it easier to push the frame 1. The second locking assembly 27 locks the rotating seat 24. When it needs to be folded, the second locking assembly 27 is unlocked, the rotating seat 24 rotates counterclockwise, and the pull ring moves to the right end of the arc groove 21. At the same time, the push-pull rod 3 is fitted with the frame 1, so that the pull ring pulls the first cable 18, and the first cable 18 pulls the first locking assembly 11 to unlock it.

[0047] The second locking assembly 27 includes a limit block 28 and a limit groove 29. The push-pull rod 3 and the rotating seat 24 have a cavity for embedding the limit block 28. The bottom of the groove of the fixed seat 20 is provided with a limit groove 29 for embedding the limit block 28. When the pull ring is located at the left end of the arc groove 21, the push-pull rod 3 is dragged backward, and the rotating seat 24 does not need to be locked by the second locking assembly 27. The pull ring is located at the left end. Since the left end of the arc groove 21 is close to the frame 1, the length of the first cable 18 pulled by the pull ring is relatively short, and the first cable 18 cannot be locked. The first locking assembly 11 is unlocked, so that the moving assembly 4 is still in the locked state; when the push-pull rod 3 is manually pushed, the rotating seat 24 needs to be locked because it is pushed, and the limit block 28 extends into the limit groove 29 to lock it. When it needs to be unlocked, the limit block 28 exits the limit groove 29, and the rotating seat 24 rotates counterclockwise, so that the pull ring moves to the right end of the arc groove 21, and the pull ring unlocks the first locking assembly 11 through the first cable 18; a first spring 26 is provided between the limit block 28 and the inner wall of the push-pull rod 3 (at the limit block 2 8 has a groove on its side, in which a first spring 26 is embedded, and the outer wall of the limit block 28 is fitted with the inner wall of the butt tube, and a card passes through the wall of the butt tube, and the card extends into the groove of the limit block 28 and presses the top of the first spring 26, and the other end of the first spring 26 rests on the bottom of the groove of the limit block 28, and the limit block 28 is pressed downward by the first spring 26). The first spring 26 makes the limit block 28 protrude from the bottom of the outer wall of the rotating seat 24 and the limit block 28 extends into the limit groove 29, and at the top of the limit block 28 The second cable 32 is fixed to the bottom by welding, and the top of the second cable 32 is fixed to the unlocking block 31 by welding. The unlocking block 31 is sleeved on the push-pull rod 3 and slides up and down. The unlocking block 31 moves up and down on the push-pull rod 3. When the unlocking block 31 moves upward, the second cable 32 pulls the limit block 28 to move upward, so that the limit block 28 disengages from the limit groove 29, and the rotating seat 24 can be rotated, so that it can be folded. When the limit block 28 disengages from the limit groove 29, the unlocking block 31 can be released.

[0048] The moving assembly 4 includes a front wheel group 5 and a rear wheel group 6. A linkage rod 7 is embedded in the frame 1 and the linkage rod 7 is rotatably connected to the frame 1 so that the linkage rod 7 can rotate. The frame is composed of a hollow tube. The front and rear ends of the linkage rod 7 are respectively fixed to the front wheel group 5 and the rear wheel group 6 by bolts. The front wheel group 5 and the rear wheel group 6 each include a rotating block 8 and a tire 9. The tire 9 is mounted on the rotating block 8 through a bearing. A first locking assembly 11 for locking the rear wheel seat rotating block 8 is installed on the frame 1. The first locking assembly 1 1 is located on the side of the rear wheel assembly 6 away from the push-pull rod 3 (that is, the first locking assembly 11 is located in front of the rear wheel assembly 6). A notch is formed on the outer wall of the frame 1. The rotating block 8 passes through the notch and is fixedly connected to the linkage rod 7 by bolts. In this way, the front wheel assembly 5 and the rear wheel assembly 6 can swing synchronously through the linkage rod 7. A groove is formed on the side of the rotating block 8 facing the first locking assembly 11 for the first locking assembly 11 to extend into. When the first locking assembly 11 is unlocked, the rotating block 8 can rotate, thereby realizing the folding of the front wheel assembly 5 and the rear wheel seat.

[0049] The first locking assembly 11 includes a mounting seat 12, a locking block 13 and a sliding channel 14. The mounting seat 12 is installed at the bottom of the frame 1, and the mounting seat 12 is located at the front side of the rotating block 8 of the rear wheel group 6. A sliding channel 14 facing the rotating block 8 is opened on the mounting seat 12, and a groove body connected to the sliding channel 14 is opened on the front end surface of the rotating block 8 of the rear wheel group 6. A locking block 13 sliding in the sliding channel 14 is embedded in the sliding channel 14. A fixing block 16 is fixed to the end of the mounting seat 12 away from the rotating block 8 by bolt fastening. The fixing block 16 is installed at the front end of the sliding channel 14, and a second spring 17 is embedded in the sliding channel 14 between the fixing block 16 and the locking block 13. A hole is provided on the block 16 for the first cable 18 to pass through. The end of the first cable 18 is fixed to the front end of the locking block 13 by welding. The locking block 13 is pushed into the slot of the rotating block 8 by the second spring; when unlocking is required, the first cable 18 is pulled backward through the pull ring, and the first cable 18 pulls the locking block 13 forward, so that the locking block 13 presses the second spring 17, so that the locking block 13 is separated from the slot on the rotating block 8, thus completing the unlocking. When the second locking assembly 27 is unlocked, the first cable 18 is pulled backward by the rotation of the rotating seat 24, so that the first locking assembly 11 is unlocked, and then the moving assembly 4 can be swung, thus achieving one-time unlocking and completing the folding of the push-pull rod 3 and the moving assembly 4.

[0050] A brake pedal 33 is installed at the rear end of the fixed seat 20, and the brake pedal 33 is hinged at the bottom of the rear end of the fixed seat 20. A torsion spring is fixed between the brake pedal 33 and the fixed seat 20 by welding, and the upward return of the brake pedal 33 is achieved by the torsion spring. A wire groove 34 is installed at the bottom of the fixed seat 20 by bolt fastening, and a brake assembly 35 is installed on each set of moving mechanisms. The brake assembly 35 is connected to one end of the third cable 46 by welding, and the other end of the third cable 46 passes through the wire groove 34 and is connected to the brake pedal 33 by welding. When the brake pedal 33 is stepped on, the third cable 46 is pulled to move, and the third cable 46 strengthens the brake assembly 35 to brake the rear wheel.

[0051] The brake assembly 35 is installed on the inner side of the moving assembly 4 (the brake assembly 35 is installed on the inner side of the rear wheel), and a locking hole 36 is opened on the inner wall of the rear wheel in an annular array; the brake assembly 35 includes a locking block 37, a locking ejector pin 38, a second spring 17 and an ejection assembly 45, the locking block 37 faces the rear wheel, and a cross groove 39 is opened on the locking block 37, and the ejection assembly 45 is embedded in the two grooves of the cross groove 39. The ejection assembly 45 includes a sliding plate 55 and a locking plate 56, and the sliding plate 55 and the lock pin 38 are connected. The stopper 56 is arranged in a cross shape, and the sliding piece 55 and the locking piece 56 are respectively embedded in the two grooves of the cross groove 39. The sliding piece 55 is provided with an embedding groove 40, and the locking piece 56 is inserted into the embedding groove 40 of the sliding piece 55. A bevel groove 41 is provided on the side of the sliding piece 55 facing the moving component 4 (that is, a bevel groove 41 is provided on the outer side of the sliding piece 55, and the bevel groove 41 is inclined inward from front to back). A bevel block 42 is stuck in the bevel groove 41 and fits with the bevel surface of the bevel groove 41. The bevel block 42 and the locking piece 56 are welded together. The locking thimble 38 is fixed to the end of the locking piece 56 facing the moving component 4 by welding. The locking thimble 38 is also located in the cross groove 39. A fourth spring 43 is sleeved on the locking thimble 38. The two ends of the fourth spring 43 are respectively fixed on the locking thimble 38 and the inner wall of the cross groove 39. The locking thimble 38 is retracted into the inside of the cross groove 39 by the fourth spring 43. When braking is required, the brake pedal 33 is stepped on and the third cable 46 is pulled backward. The sliding plate 55 moves backward. Due to the action of the inclined groove 41 and the inclined block 42, when the sliding plate 55 moves backward, the locking plate 56 moves outward. In this way, the locking jack on the outer side of the locking plate 56 extends into the locking hole 36 of the rear wheel to lock it, thereby achieving braking. When the brake pedal 33 is stopped, the brake pedal 33 returns to its original position, and the locking pin 38 retracts into the inside of the cross groove 39 under the action of the fourth spring 43. In this way, the locking pin 38 leaves the locking hole 36, thereby releasing the locking state of the rear wheel.

[0052] A third locking assembly 47 is installed on the two sets of oppositely arranged swing guard frames 2 (a third locking assembly 47 is installed on the front and rear sets of swing guard frames 2), and the position of the swing guard frame 2 is locked by the third locking assembly 47; the swing guard frame 2 is made of a hollow tube, and a rotating shaft 48 is fixed to the inner side of the frame 1 by welding, and a sleeve 49 that rotates on the rotating shaft 48 is sleeved on the rotating shaft 48, and the front and rear sets of swing guard frames 2 are installed on the sleeve 49 by welding, and the third locking assembly 47 is embedded in the left and right ends of the top pipes of the front and rear sets of swing guard frames 2. Component 47 includes a locking pin 50 and a fourth cable 51. Notches are provided at the left and right ends of the top pipes of the front and rear sets of the swing guard frames 2. Locking pins 50 are embedded in the notches. The locking pins 50 slide in the top pipe. Locking grooves 53 for the locking pins 50 to be embedded are provided on the inner sides of the front and rear ends of the left and right sets of the swing guard frames 2. The tails of the locking pins 50 on the front and rear sets of the swing guard frames 2 extend into the locking grooves 53 of the left and right sets of the swing guard frames 2. A third spring 52 is fixed between the locking pin 50 and the top pipe of the swing guard frame 2 by welding. The locking pin 50 is pressed outward by the third spring 52, so that the locking pin 50 extends into the locking groove 53, which can prevent the front and rear two sets of swing protection frames 2 from swinging forward and backward when the locking pin 50 is not unlocked, thereby realizing the locking of the front and rear two sets of swing protection frames 2. Since the splicing structure 10 is a mortise and tenon structure, the left and right ends of the front and rear two sets of swing protection frames 2 are arc-shaped male tenons, and the front and rear ends of the left and right two sets of swing protection frames 2 are female tenons, and the male tenon and the female tenon are arc-shaped T-blocks and T-slots respectively. When the front and rear two sets of swing protection frames 2 are locked, the left and right two sets of swing protection frames 2 cannot swing to the left and right. A movable unlocking handle is installed on the top of the swing protection frame 2 in a hinged manner. Hand 54, the unlocking handle 54 is connected to the fourth cable 51 by welding (the fourth cable 51 passes through the pipe at the top of the swing protection frame 2 and is connected to the unlocking handle 54), and the other end of the fourth cable 51 is fixed to the inner side of the locking pin 50 by welding. When the unlocking handle 54 is pulled upward, the fourth cable 51 is pulled inward, thereby pulling the locking pin 50 inward, so that the locking pin 50 disengages from the locking groove 53 on the inner side of the left and right sets of swing protection frames 2, so that the front and rear swing protection frames 2 can rotate automatically, and the male tenon is separated from the female tenon, so that the left and right sets of swing protection frames 2 can also rotate automatically.

[0053] When the baby outgrows the trailer, the present invention can be used as a shopping trailer.

Claims

1. A dual-purpose trailer for twins and shopping carts, comprising a frame, a swing guard frame, a push-pull rod, and a moving assembly. Multiple sets of swing guard frames are disposed above the frame, enclosing the top of the frame. Each set of swing guard frames is rotatably connected to the frame, and adjacent swing guard frames are spliced ​​together by a splicing structure. It is characterized by: Two groups of moving assemblies are provided at the bottom of the frame and are mounted on both sides of the frame, each group of moving assemblies is rotatably connected to the frame, and a first locking assembly is provided between the moving assembly and the frame; A push-pull rod is installed at the rear end of the frame through a large joint, a second locking assembly is arranged in the large joint, the first locking assembly is linked to the second locking assembly, and an unlocking block for unlocking the second locking assembly is arranged on the push-pull rod.

2. A twin and shopping dual-purpose trailer according to claim 1, characterized in that: The large joint includes a fixed seat, a rotating seat and a pin shaft. The fixed seat is installed on the frame. A groove for installing the rotating seat is opened on the fixed seat. A coaxial pin shaft is installed on the rotating seat. The pin shaft passes through the fixed seat and is rotatably connected to the rotating seat. The rotating seat is connected to the push-pull rod. A first cable is arranged between the rotating seat and the first locking assembly. Both ends of the first cable are installed on the rotating seat and the first locking assembly. One end of the first cable moves back and forth with the rotation of the rotating seat. When the push-pull rod swings and fits the top of the frame, the first cable pulls the first locking assembly to unlock.

3. A twin and shopping dual-purpose trailer according to claim 2, characterized in that: An arc-shaped groove is provided on the side of the fixed seat facing the rotating seat, and the distances from the two ends of the arc-shaped groove to the vehicle frame are inconsistent. A moving block is provided in the arc-shaped groove for moving in the arc-shaped groove. The moving block is connected to the rotating seat and rotates synchronously. The moving block is connected to the first cable. A clearance groove for the first cable to extend into is provided at the bottom of the arc-shaped groove. The clearance groove passes through the fixed seat, and the first cable extends into the clearance groove and is connected to the rotating seat.

4. A twin and shopping dual-purpose trailer according to claim 3, characterized in that: The arc groove is a semicircular arc groove, and both ends of the arc groove are arranged horizontally.

5. A twin and shopping dual-purpose trailer according to claim 1 or 4, characterized in that: The second locking assembly includes a limit block and a limit groove. The push-pull rod and the rotating seat are provided with a cavity for embedding the limit block. A limit groove for embedding the limit block is provided at the bottom of the groove of the fixed seat. A first spring is arranged between the limit block and the inner wall of the push-pull rod. The first spring makes the limit block protrude from the bottom of the outer wall of the rotating seat and the limit block extends into the limit groove. A second cable is installed on the top of the limit rod. The top of the second cable is installed on the unlocking block. The unlocking block is sleeved on the push-pull rod and slides up and down.

6. A twin and shopping dual-purpose trailer according to claim 5, characterized in that: The moving assembly includes a front wheel group and a rear wheel group. A linkage rod is embedded in the frame and the linkage rod is rotatably connected to the inside of the frame. Both ends of the linkage rod are fixed to the front wheel group and the rear wheel group respectively. The front wheel group and the rear wheel group both include a rotating block and a tire. A first locking assembly for locking the rotating block of the rear wheel seat is installed on the frame. The first locking assembly is located on the side of the rear wheel group away from the push-pull rod, and a notch is opened on the frame. The rotating block passes through the notch on the frame and is fixedly connected to the linkage rod, and a tire is installed at the bottom of the rotating block; a groove body for the first locking assembly to extend into is opened on the side of the rotating block facing the first locking assembly, and the first locking assembly extends into the groove body to realize the locking of the rotating block.

7. A twin and shopping dual-purpose trailer according to claim 6, characterized in that: The first locking assembly includes a mounting seat, a locking block and a sliding channel. The mounting seat is installed on the frame. A sliding channel facing the rotating block is opened on the mounting seat. A groove body connected to the sliding channel is opened on the rotating block of the rear wheel group. A locking block sliding in the sliding channel is embedded in the sliding channel. A fixed block is fixed at the end of the mounting seat away from the rotating block. A second spring is arranged between the fixed block and the locking block. Holes for the first cable to pass through are opened on the outer wall of the mounting seat and the fixed seat. The end of the first cable is installed on the locking block, and the locking block extends into the groove body of the rotating block through the two springs.

8. A twin and shopping dual-purpose trailer according to claim 7, characterized in that: A brake pedal is installed on the fixed seat, the brake pedal is hinged at the bottom of the fixed seat, a wire groove is installed at the bottom of the fixed seat, a brake assembly is installed on each set of moving mechanisms, the brake assembly is connected to a third cable, and the third cable passes through the wire groove to be connected to the brake pedal.

9. A twin and shopping dual-purpose trailer according to claim 8, characterized in that: A third locking assembly is installed on the two sets of relatively arranged swing guard frames, and the position of the swing guard frames is locked by the third locking assembly; the swing guard frame is made of a hollow tube, a rotating shaft is fixed on the frame, a sleeve is sleeved on the rotating shaft, and the swing guard frame is installed on the sleeve, and the third locking assembly is embedded in the top pipes of the front and rear sets of swing guard frames. The third locking assembly includes a locking pin and a fourth cable, and notches are opened at both ends of the top pipes of the front and rear sets of swing guard frames, and locking pins are embedded in the notches. Locking grooves for the locking pin to be embedded are opened on the inner sides of the two ends of the left and right sets of swing guard frames, and the tail of the locking pin extends into the locking grooves of the left and right sets of swing guard frames. A third spring is arranged between the locking pin and the inside of the swing guard frame, and a pullable unlocking handle is installed on the top of the swing guard frame, and the unlocking handle is connected to the fourth cable.

10. A twin and shopping dual-purpose trailer according to claim 9, characterized in that: The brake assembly is installed on the inner side of the moving assembly, and locking holes distributed in a circular array are opened on the inner wall of the moving assembly; the brake assembly includes a locking block, a locking pin, a second spring and a pushing assembly, the locking block faces the moving assembly, a cross groove is opened on the locking block, and the pushing assembly is embedded in the cross groove, the pushing assembly includes a sliding plate and a locking plate, an embedding groove is installed on the sliding plate, the locking plate is embedded in the embedding groove of the sliding plate, an oblique groove is provided on the side of the sliding plate facing the moving assembly, an oblique block that fits with the oblique surface of the oblique groove is stuck in the oblique groove, the oblique block is fixed to the locking plate, a locking pin is fixed at one end of the locking plate facing the moving assembly, the locking pin is also located in the cross groove, a fourth spring is sleeved on the locking pin, and the two ends of the fourth spring are respectively fixed on the locking pin and the inner wall of the cross groove.

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