Dual-purpose trailer for twins and shopping

Abstract

The invention discloses a twin and shopping dual-purpose trailer which comprises a frame, swing protection frames, a push-pull rod and a moving assembly, a plurality of sets of swing protection frames are arranged above the frame and surround the top of the frame, each set of swing protection frame is rotationally connected with the frame, and the adjacent swing protection frames are spliced through a splicing structure; two moving assemblies are arranged at the bottom of the frame and mounted on the two sides of the frame, each moving assembly is rotationally connected with the frame, and first locking assemblies are arranged between the moving assemblies and the frame; a push-pull rod is mounted 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 invention 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 are generally equipped with multiple unlocking mechanisms, so each folded structure needs to be unlocked, so when folding, it needs to be unlocked multiple times, 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 is required to place the baby trailer. At the same time, the moving components cannot be folded, so that the baby trailer can be moved when placed. Summary of the invention

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

[0004] To achieve the above object, the present invention provides a dual-purpose trailer for twins and shopping, comprising a frame, a swing protection frame, a push-pull rod and a moving assembly, wherein a plurality of swing protection frames are arranged above the frame, the plurality of swing protection frames surround the top of the frame, each swing protection frame is rotatably connected to the frame, and adjacent swing protection frames are spliced ​​by a splicing structure; Two groups of moving components are arranged at the bottom of the frame and are installed on both sides of the frame, each group of moving components is rotatably connected to the frame, and a first locking component is arranged between the moving components 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 with the second locking assembly, and an unlocking block for unlocking the second locking assembly is arranged on the push-pull rod.

[0005] 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, and 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, and when the push-pull rod swings and fits the top of the frame, the first cable pulls the first locking assembly to unlock.

[0006] 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 frame are inconsistent. A moving block that moves in the arc-shaped groove is arranged 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 arranged 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 to be connected to the rotating seat.

[0007] Preferably, the arc-shaped groove is a semicircular arc-shaped groove, and both ends of the arc-shaped groove are arranged horizontally.

[0008] 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, 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, the top of the second cable is installed on the unlocking block, and the unlocking block is sleeved on the push-pull rod to slide up and down.

[0009] 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, two ends of the linkage rod are respectively fixed to the front wheel group and the rear wheel group, 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, 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.

[0010] Preferably, the first locking assembly includes a mounting seat, a locking block and a sliding channel, the mounting seat is mounted 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 assembly, 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 mounted on the locking block, and the locking block extends into the groove body of the rotating block through the two springs.

[0011] 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 group of moving mechanisms, a third cable is connected to the brake assembly, and the third cable passes through the wire groove to connect with the brake pedal.

[0012] Preferably, a third locking assembly is installed on the two groups of relatively arranged swing protection frames, and the position of the swing protection frames is locked by the third locking assembly; the swing protection frame is made of a hollow tube, a rotating shaft is fixed on the frame, a sleeve is sleeved on the rotating shaft, the swing protection frame is installed on the sleeve, and the third locking assembly is embedded in the top pipes of the front and rear groups of swing protection frames, the third locking assembly includes a locking pin and a fourth cable, notches are opened at both ends of the top pipes of the front and rear groups of swing protection frames, 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 groups of swing protection frames, the tail of the locking pin extends into the locking grooves of the left and right groups of swing protection frames, a third spring is arranged between the locking pin and the inside of the swing protection frame, and a pullable unlocking handle is installed on the top of the swing protection frame, and the unlocking handle is connected to the fourth cable.

[0013] Preferably, the brake assembly is installed on the inner side of the moving assembly, and a locking hole distributed in a circular array is opened on the inner wall of the moving assembly; the brake assembly includes a locking block, a locking ejector 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 inclined groove is provided on the side of the sliding plate facing the moving assembly, an inclined block that fits the inclined surface of the inclined groove is stuck in the inclined groove, the inclined block is fixed to the locking plate, a locking ejector pin is fixed at one end of the locking plate facing the moving assembly, the locking ejector pin is also located in the cross groove, a fourth spring is sleeved on the locking ejector pin, and the two ends of the fourth spring are respectively fixed on the locking ejector pin and the inner wall of the cross groove.

[0014] Compared with the prior art, the advantages of the present invention are: The swing protection frame, push-pull rod and moving components of the trailer can be folded, which reduces the occupied space and is convenient for carrying; One-touch unlocking and folding is realized, which facilitates quick folding; The push-pull rod can swing, so it can be used as a push rod or a pull rod; The trailer has a large space and can be used to place twin babies or for shopping. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a left view of the present invention.

[0016] Figure 2 It is a bottom view of the present invention.

[0017] Figure 3 It is a top view of the present invention.

[0018] Figure 4 It is a three-dimensional view of the present invention.

[0019] Figure 5 It is a schematic diagram of the push-pull rod, the limit block and the second cable of the present invention.

[0020] Figure 6 It is a schematic diagram of the limit block, the first spring and the second cable of the present invention.

[0021] Figure 7 It is a cross-sectional view of the fixed seat, the rotating seat and the limiting block of the present invention.

[0022] Figure 8 It is a schematic diagram of the fixing seat, the first cable and the clearance groove of the present invention.

[0023] Fig. 9 It is a schematic diagram of the frame of the present invention.

[0024] Fig.10 It is a schematic diagram of the rotating block and the linkage rod of the front wheel assembly of the present invention.

[0025] Fig.11 It is a schematic diagram of the positions of the first locking assembly and the brake assembly of the present invention.

[0026] Fig.12 It is a schematic diagram of the rear wheel assembly rotating seat, a locking assembly and a brake assembly of the present invention.

[0027] Fig.13 It is a schematic diagram of the back side of the brake pedal of the present invention.

[0028] Fig.14 This is a schematic diagram of the first locking assembly of the present invention with half of the outer shell removed.

[0029] Fig.15 This is a schematic diagram of the brake assembly of the present invention with half of the outer shell removed.

[0030] Fig.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.

[0031] Fig.17 It is a schematic diagram of the front and rear swing protection frame and the third locking assembly of the present invention.

[0032] Fig.18 It is a schematic diagram of the present invention after folding.

[0033] 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. giving way groove, 24. rotating seat, 25. pin, 26. first spring, 27. second locking assembly, 28. limit block , 29, limit 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, oblique groove, 42, oblique block, 43, fourth spring, 45, ejection 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

[0034] The present invention will now be further described with reference to the accompanying drawings.

[0035] 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 assembly 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 it is needed to be used, 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 structure between the swing protection frames 2 is opened and swung inward, and the swing protection frames 2 are fitted with the top of the frame 1. Two groups of moving components 4 are arranged at the bottom of the frame 1 and the two groups of moving components 4 are installed on the left and right sides of the frame 1. Each group of moving components 4 is rotatably connected to the frame 1. A first locking component 11 is arranged between the moving components 4 and the frame 1. When it is needed to be used, the moving components 4 are swung down to a vertical state, and the moving components 4 are locked by the first locking component 11, so that the moving components 4 are always in a vertical state. When it is needed to be folded, the first locking component 11 is unlocked, and the moving components 4 can be rotated, and the moving components 4 are swung inward to fit the bottom of the frame 1, so that the folding of the moving components 4 is completed; 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 assembly 27 is arranged in the large joint 19. The first locking assembly 11 is linked with the second locking assembly 27. An unlocking block 31 for unlocking the second locking assembly 27 is arranged 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 assembly 27. In this way, the push-pull rod 3 cannot swing, and the frame 1 is dragged by the push-pull rod 3 to move. 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 to a vertical state, 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.

[0036] The large joint 19 includes a fixed seat 20, a rotating seat 24 and a pin 25. The fixed seat 20 is installed on the frame 1 by bolts. A groove for installing 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, so that 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 tube is fixed by welding, and the butt tube is directly inserted into the hollow part of the push-pull rod 3, and the butt tube and the push-pull rod 3 are locked by bolts). A first cable 18 is arranged 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, and one end of the first cable 18 is connected to the eccentric part of the rotating seat 24. 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.

[0037] A semicircular arc groove 21 is provided on one side of the fixed seat 20 facing the rotating seat 24, and 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), and a moving block 22 is provided in the arc groove 21 for moving in the arc groove 21, and the moving block 22 is a bolt, and the moving block 22 is connected to the rotating seat 24 and rotates synchronously, and 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, and the bolt passes through the pull ring and extends into the rotating shaft 48 In the bolt hole, when the rotating seat 24 rotates, the pull ring moves away from the frame 1, pulling the first cable 18). A clearance groove 23 for the first cable 18 to extend into is opened at the bottom of the arc groove 21. 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, the push-pull rod 3 rotates counterclockwise to fit the top of the frame 1, and the rotating seat 24 rotates counterclockwise, the pull ring moves away from the frame 1 and pulls the first cable 18 to the right, and the first cable 18 works to unlock the first locking component 11, and then the moving component 4 can be folded.

[0038] 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 far away from the frame 1. The arc groove 21 is arranged 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, and 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 raised, 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 fits 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.

[0039] 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 has 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, since the push-pull rod 3 is dragged backward (mainly subjected to backward pulling force), 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. , the first cable 18 cannot unlock the first locking assembly 11, so the moving assembly 4 is still in a 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 is necessary to unlock, the limit block 28 withdraws from 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 arranged between the limit block 28 and the inner wall of the push-pull rod 3 (A groove is opened on the side of the limit block 28, and a first spring 26 is embedded in the groove. The outer wall of the limit block 28 fits with the inner wall of the butt tube. A card passes through the wall of the butt tube. The card extends into the groove of the limit block 28 and presses the top of the first spring 26. The other end of the first spring 26 is against the bottom of the groove of the limit block 28. 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. A second cable 32 is fixed to the top of 8 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, and when the limit block 28 disengages from the limit groove 29, the unlocking block 31 can be released.

[0040] 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 bolt fastening. The front wheel group 5 and the rear wheel group 6 both 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 group 6 away from the push-pull rod 3 (that is, the first locking assembly 11 is located on the front side of the rear wheel group 6), a notch is opened on the outer wall of the frame 1, and the rotating block 8 passes through the notch and is fixedly connected to the linkage rod 7 by bolts, so that the front wheel group 5 and the rear wheel group 6 can be synchronously swung through the linkage rod 7; a groove body for the first locking assembly 11 to extend into is opened on the side of the rotating block 8 facing the first locking assembly 11, and when the first locking assembly 11 is unlocked, the rotating block 8 can rotate, so that the front wheel group 5 and the rear wheel seat can be folded.

[0041] The first locking assembly 11 includes a mounting seat 12, a locking block 13 and a sliding channel 14. The mounting seat 12 is mounted on the bottom of the frame 1. 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. 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. The 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 mounted on the front end of the sliding channel 14. A second spring 17 is embedded in the sliding channel 14 between the fixing block 16 and the locking block 13. The block 16 is provided with a hole for the first cable 18 to pass through, and the end of the first cable 18 is fixed to the front end of the locking block 13 by welding, and the locking block 13 is pushed into the slot body of the rotating block 8 by the second spring; when unlocking is required, the first cable 18 is pulled backwards through the pull ring, and the first cable 18 pulls the locking block 13 to move forward, so that the locking block 13 presses the second spring 17, so that the locking block 13 is separated from the slot body on the rotating block 8, and the unlocking is completed. When the second locking assembly 27 is unlocked, the first cable 18 is pulled backwards 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, so that one-time unlocking is achieved, and the folding of the push-pull rod 3 and the moving assembly 4 is completed.

[0042] 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 brake pedal 33 is returned upward 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 group 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.

[0043] 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 arranged in a circular array on the inner wall of the rear wheel; 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, a cross groove 39 is arranged on the locking block 37, and the ejection assembly 45 is embedded in the two grooves of the cross groove 39, and the ejection assembly 45 includes a sliding plate 55 and a locking plate 56, and the sliding plate 55 and the lock The stopper 56 is arranged in a cross shape, 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, the locking piece 56 is inserted into the embedding groove 40 of the sliding piece 55, and an inclined groove 41 is arranged on the side of the sliding piece 55 facing the moving component 4 (that is, an inclined groove 41 is arranged on the outer side of the sliding piece 55, and the inclined groove 41 is inclined inward from front to back), and an inclined block 42 that fits the inclined surface of the inclined groove 41 is stuck in the inclined groove 41, and the inclined block 42 and the locking piece 56 are welded together. The locking plate 56 is fixed by welding at one end thereof facing the moving assembly 4. The locking pin 38 is also located in the cross groove 39. A fourth spring 43 is sleeved on the locking pin 38. The two ends of the fourth spring 43 are respectively fixed on the locking pin 38 and the inner wall of the cross groove 39. The locking pin 38 is retracted into 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, and 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, so that the locking jack on the outer side of the locking plate 56 extends into the locking hole 36 of the rear wheel for locking, thereby achieving braking. When the brake pedal 33 stops stepping on, the brake pedal 33 returns to its original position, and the locking pin 38 retracts into the cross groove 39 under the action of the fourth spring 43, so that the locking pin 38 leaves the locking hole 36, thereby releasing the locking state of the rear wheel.

[0044] A third locking assembly 47 is installed on two sets of relatively arranged swing protection frames 2 (third locking assemblies 47 are installed on the front and rear sets of swing protection frames 2), and the position of the swing protection frames 2 is locked by the third locking assembly 47; the swing protection frames 2 are made of hollow tubes, and a rotating shaft 48 is fixed on 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 protection frames 2 are installed on the sleeve 49 by welding, and the third locking assemblies 47 are embedded in the left and right ends of the top pipes of the front and rear sets of swing protection 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 swing protection 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 swing protection frames 2. The tails of the locking pins 50 on the front and rear sets of swing protection frames 2 extend into the locking grooves 53 of the left and right sets of swing protection frames 2. A third spring 52 is fixed between the locking pin 50 and the top pipe of the swing protection 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 groups 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 groups 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 groups of swing protection frames 2 are arc-shaped male tenons, and the front and rear ends of the left and right groups of swing protection frames 2 are female tenons, and the male tenons and the female tenons are arc-shaped T-shaped blocks and T-shaped grooves respectively. When the front and rear groups of swing protection frames 2 are locked, the left and right groups of swing protection frames 2 cannot swing to the left and right sides, and 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 on 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 is disengaged 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.

[0045] When the baby is not using the trailer, it can be used as a shopping cart.

Claims

1. A twin and shopping dual-purpose trailer, comprising a frame, a swing protection frame, a push-pull rod and a moving assembly, wherein a plurality of swing protection frames are arranged above the frame, the plurality of swing protection frames surround the top of the frame, each swing protection frame is rotatably connected to the frame, and adjacent swing protection frames are spliced ​​by a splicing structure, characterized in that: The splicing structure is a mortise and tenon structure, two groups of swing protection frames arranged opposite to each other are provided with female tenons, and the other two groups of swing protection frames are provided with male tenons, the male tenons and the female tenons are respectively a T-shaped block and a T-shaped slot, wherein the T-shaped block and the T-shaped slot are both arc-shaped, and a third locking assembly is installed on the swing protection frame provided with the female tenon, and the position of the swing protection frame is locked by the third locking assembly; Two groups of moving components are arranged at the bottom of the frame and are installed on both sides of the frame, each group of moving components is rotatably connected to the frame, and a first locking component is arranged between the moving components 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 with 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 forward and backward 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 21, characterized in that: An arc groove is opened on the side of the fixed seat facing the rotating seat, and the distances from the two ends of the arc groove to the frame are inconsistent. A moving block is arranged in the arc groove for moving in the arc 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 arranged at the bottom of the arc 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.

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 pull cable is installed on the top of the limit rod. The top of the second pull cable is installed on the unlocking block. The unlocking block is sleeved on the push-pull rod to slide up and down.

6. A twin and shopping dual-purpose trailer according to claim 5, characterized in that: The moving component 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 component for locking the rotating block of the rear wheel seat is installed on the frame. The first locking component 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 component to extend into is opened on the side of the rotating block facing the first locking component, and the first locking component 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 mounted 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 assembly. A locking block sliding in the sliding channel is embedded in the sliding channel. A fixed block is fixed at one 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 mounted on the locking block. 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 group of moving mechanisms, the brake assembly is connected with a third cable, and the third cable passes through the wire groove to be connected with 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 two sets of relatively arranged swing protection frames, and the position of the swing protection frames is locked by the third locking assembly; the swing protection frame is made of a hollow tube, a rotating shaft is fixed on the frame, a sleeve is sleeved on the rotating shaft, the swing protection 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 protection 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 protection 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 protection frames, and the tail of the locking pin extends into the locking grooves of the left and right sets of swing protection frames, and a third spring is arranged between the locking pin and the inside of the swing protection frame, and a pullable unlocking handle is installed on the top of the swing protection 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 ejector pin, a second spring and a push-up assembly, the locking block faces the moving assembly, a cross groove is opened on the locking block, and the push-up assembly is embedded in the cross groove, the push-up 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 inclined groove is provided on the side of the sliding plate facing the moving assembly, an inclined block that fits the inclined surface of the inclined groove is stuck in the inclined groove, the inclined block is fixed to the locking plate, a locking ejector pin is fixed at the end of the locking plate facing the moving assembly, the locking ejector pin is also located in the cross groove, a fourth spring is sleeved on the locking ejector pin, and the two ends of the fourth spring are respectively fixed on the locking ejector pin and the inner wall of the cross groove.

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