Double locking structure of a stroller

Abstract

The utility model discloses a double locking buckle structure of cart, including base, the first support and second support of rotation connection in the both ends of base, still include the lock catch structure, the lock catch structure includes fixed base, first lock catch spare and second lock catch spare, the fixed base is fixed in the first support, the first lock catch spare is rotationally arranged in the first support, and the first lock catch spare and fixed base form locking groove between, the second support with locking groove locking cooperation, second lock catch spare is slidably arranged on the fixed base, be equipped with the buckle on the second lock catch, be equipped with corresponding clamping groove on the first lock catch spare, the buckle with clamping groove joint cooperation, the utility model discloses have double locking structure, can effectively prevent the cart and appear the loosening phenomenon in the use process, significantly improve structural stability.

Description

Technical Field

[0001] This utility model relates to the field of folding trolley technology, and in particular to a double-locking structure for a trolley. Background Technology

[0002] Currently, strollers are widely used in daily life and industrial transportation, such as baby strollers, tool strollers, shopping strollers, and medical strollers. To facilitate carrying and storage, most strollers adopt a foldable structure, that is, they are connected to the base by two sets of brackets in a hinged manner, and users can unfold or fold the stroller as needed.

[0003] In existing trolley locking structures, when the trolley is subjected to external impact or when the trolley travels over bumpy ground, the locking mechanism is prone to slight loosening or falling off, causing the bracket to wobble or even come loose during use. This results in insufficient overall stability of the trolley and poses a significant safety hazard. Utility Model Content

[0004] The purpose of this invention is to provide a double-locking structure for a stroller, which has a double locking structure to effectively prevent the stroller from coming loose during use and significantly improve structural stability.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a double-locking structure for a trolley, comprising a base, a first bracket and a second bracket rotatably connected to both ends of the base, characterized in that: it further comprises a locking structure, the locking structure comprising a fixed base, a first locking member and a second locking member, the fixed base being fixed to the first bracket, the first locking member being rotatably disposed on the first bracket, and a locking groove being formed between the first locking member and the fixed base, the second bracket being locked in place with the locking groove; the second locking member being slidably disposed on the fixed base, the second locking member having a buckle, the first locking member having a corresponding slot, the buckle engaging with the slot; the fixed base having a first elastic member, the first elastic member having an elastic force that drives the buckle of the second locking member and the slot of the first locking member to remain in a locked state.

[0006] By adopting the above technical solution, the locking groove formed between the first locking component and the fixed seat can be stably engaged with the second bracket to achieve initial locking of the trolley bracket, thereby providing a reliable positioning connection when the trolley is unfolded; at the same time, the second locking component achieves secondary locking through the snap-fit ​​structure of the snap-fit ​​and the snap-fit ​​groove, forming a double anti-loosening structure, which effectively prevents the trolley from loosening due to vibration or force during use, and improves the stability of the overall structure.

[0007] The present invention is further configured such that: the second locking member is provided with a movable protrusion, and the first locking member is provided with a corresponding sliding groove, wherein the movable protrusion is slidably engaged with the sliding groove.

[0008] By adopting the above technical solution, the sliding fit between the movable protrusion and the slide groove allows the second locking component to move smoothly along the slide groove during unlocking or locking. Users can quickly complete the operation by pushing and pulling, avoiding deviation or jamming, thus ensuring a smooth use process.

[0009] The present invention is further configured such that: the fixed base is provided with a boss, the first elastic member is sleeved on the boss, the movable protrusion is provided with a beveled part at the end away from the buckle, and the two ends of the first elastic member respectively abut against the beveled part.

[0010] By adopting the above technical solution, the first elastic element cooperates with the inclined surface to provide an automatic reset force after unlocking, so that the locking element can automatically return to the initial position after the operation is completed.

[0011] The present invention is further configured such that: a locking pin is connected to the protrusion, a limiting waist hole is provided on the second locking member, the locking pin passes through the limiting waist hole, so that the second locking member slides relative to the locking pin through the limiting waist hole, and an anti-disengagement part is provided at the end of the locking pin, the anti-disengagement part cooperates with the second locking member to prevent disengagement.

[0012] By adopting the above technical solution, the locking pin passes through the limiting hole on the second locking member, which can effectively limit the sliding range of the second locking member, prevent it from coming out or displacing excessively during operation, and ensure that the locking structure can maintain precise fit under repeated operation, thereby improving the reliability and durability of the structure.

[0013] The present invention is further configured such that: the buckle is provided with an upper guide slope, and the slot is provided with a lower guide slope that cooperates with it.

[0014] By adopting the above technical solution, the buckle and the slot are respectively provided with an upper guide slope and a lower guide slope, which can be used to guide the buckle and the slot to automatically align and engage during the locking process, reducing operating resistance.

[0015] The present invention is further configured such that: the first bracket includes a first crossbar and a first support rod vertically connected to both sides of the first crossbar; the second bracket includes a second crossbar and a second support rod vertically connected to both sides of the second crossbar; and the first crossbar is locked to the second crossbar by the locking structure.

[0016] By adopting the above technical solution, both the first and second supports adopt a symmetrical frame structure; the locking structure realizes the locking cooperation between the first and second crossbars, so that the trolley can maintain stable support in the unfolded state and can be quickly unlocked and folded in the folded state, improving the stability of the overall structure and the ease of assembly.

[0017] The present invention is further configured such that: the first locking member includes an integrally formed lever part and two outer connecting parts, the outer connecting parts being rotatably disposed on the first crossbar; the fixing base includes an integrally formed inner connecting part and an upper locking hook, the inner connecting part being fixed to the first crossbar and located between the two outer connecting parts; the lever part is provided with a lower locking hook, the upper locking hook and the lower locking hook being disposed opposite to each other and forming the locking groove.

[0018] By adopting the above technical solution, the first locking component adopts an integrated molding structure design. Manually turning the lever part can drive it to rotate. The upper locking hook on the fixed base and the lower locking hook on the lever part are arranged opposite to each other to form a locking groove. By turning, the upper and lower hooks can be separated and locked, making the locking operation during the folding or unfolding of the trolley more intuitive and reliable, and easy to operate with one hand.

[0019] The present invention is further configured such that: a second elastic member is sleeved on the first crossbar, one end of the second elastic member abuts against the fixed seat, and the other end of the second elastic member abuts against the fixed seat.

[0020] By adopting the above technical solution, the second elastic element set on the first crossbar can provide a restoring force for the first locking element, so that the first locking element automatically springs back to its original position after unlocking.

[0021] The present invention is further configured such that: a third bracket is rotatably provided at the connection end between the base and the first bracket, and the third bracket is located on the outside of the second bracket.

[0022] By adopting the above technical solution, a third support is added between the base and the first support, which can play an auxiliary support role when the trolley is unfolded, thereby improving the overall load-bearing capacity of the support structure.

[0023] The present invention is further configured such that: the third bracket includes a third crossbar and a third support rod and a third connecting rod vertically arranged on both sides of the third crossbar, and the third support rod and the third connecting rod are connected by a spring.

[0024] By adopting the above technical solution, the two sets of support rods and connecting rods of the third bracket are connected by springs, giving the third bracket a certain degree of flexibility, preventing the trolley from jamming during unfolding, and extending the overall service life of the trolley.

[0025] In summary, this utility model has the following beneficial effects: 1. This utility model has a double locking structure. The first locking element and the second locking element work together to effectively prevent the trolley from coming loose during use and significantly improve the structural stability.

[0026] 2. After the user completes the unlocking operation, there is no need to manually reset it. The locking mechanism can automatically return to its initial position under the rebound force of the torsion spring, greatly reducing the number of operation steps.

[0027] 3. A spring connection structure is set in the third bracket, which provides a certain degree of flexibility and buffer during the unfolding and folding process. This can effectively prevent the structure from jamming due to hard collisions, reduce wear and tear during long-term use, and extend the life of the whole machine. Attached Figure Description

[0028] Figure 1 This is a structural diagram of the trolley in its unfolded state.

[0029] Figure 2 This is a schematic diagram of the trolley in its folded state.

[0030] Figure 3 This is a schematic diagram of the locking structure of this utility model.

[0031] Figure 4 This is an exploded view of the locking structure of this utility model.

[0032] Figure 5 This is a structural schematic diagram of the second locking component of this utility model.

[0033] In the diagram: 1. Base; 2. First bracket; 21. First support rod; 22. First crossbar; 3. Second bracket; 31. Second support rod; 32. Second crossbar; 4. Locking structure; 41. Fixed seat; 411. Inner connecting part; 412. Upper locking hook; 413. Boss; 414. First elastic element; 42. First locking element; 421. Slot; 422. Slide groove; 425. Locking pin; 4251. Anti-detachment part ; 426. Lower guide slope; 427. Actuating part; 428. External connecting part; 429. Lower locking hook; 43. Second locking element; 431. Buckle; 432. Movable protrusion; 433. Sloping part; 434. Limiting waist hole; 435. Upper guide slope; 44. Locking groove; 45. Second elastic element; 5. Third bracket; 51. Third support rod; 52. Third connecting rod; 53. Third crossbar; 54. Spring. Detailed Implementation

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

[0035] like Figures 1 to 4As shown, this utility model provides a double-locking structure for a trolley, including a base 1, a first bracket 2 and a second bracket 3 rotatably connected to both ends of the base 1. The first bracket 2 includes two first support rods 21 and a first crossbar 22 connecting the two. The two first support rods 21 and the first crossbar 22 together form a frame structure. The second bracket 3 also includes two second support rods 31 and a second crossbar 32 vertically connected between the two. The two second support rods 31 and the second crossbar 32 together form a frame structure. The trolley also includes a locking structure 4, which reliably locks the first bracket 2 and the second bracket 3 when the trolley is unfolded, preventing loosening during use. The locking structure 4 includes a fixed base 41, a first locking element 42 and a second locking element 43. The fixed base 41 is fixedly installed on the first bracket 2. The first locking element 42 is rotatably mounted on the first bracket 2. The first locking element 42 includes an integrally formed lever part 427 and two external connecting parts 428. The external connecting parts 428 are rotatably mounted on the first crossbar 2. 2. The lever part 427 is provided with a lower locking hook 429. The fixed base 41 includes an integrally formed inner connecting part 411 and an upper locking hook 412. The inner connecting part 411 is fixed to the first crossbar 22 and located between the two outer connecting parts 428. The upper locking hook 412 and the lower locking hook 429 are arranged opposite to each other to form a locking groove 44, which is used to cooperate with the second crossbar 32 of the second bracket 3 to achieve initial locking. The second locking fastener 43 is slidably disposed on the locking fastener. The second locking fastener 43 is provided with a buckle 431. The first locking fastener 42 is provided with... A corresponding slot 421 is provided, and the buckle 431 engages with the slot 421 to achieve a second layer of locking. Through the rotational engagement of the first locking member 42 and the sliding engagement of the second locking member 43, the trolley bracket can form a stable and reliable double locking structure after unfolding, ensuring that it is not easy to loosen when unfolded for use. The user can push the second locking member 43 and pull the lever part 427 to separate the upper locking hook 412 from the lower locking hook 429, thereby realizing the unfolding or folding operation of the trolley. The operation method is intuitive and stable and reliable.

[0036] like Figure 5As shown, the second locking member 43 has a movable protrusion 432, and the first locking member 42 has a matching sliding groove 422. When the user unlocks or locks, the second locking member 43 can be smoothly slid along the sliding groove 422 by pushing the movable protrusion 432. The structure is clearly guided, the action is smooth, and it is not easy to deviate or jam, thus ensuring the smoothness and reliability of the trolley when it is frequently unfolded and folded. In order to enable the locking structure 4 to automatically reset after the operation, the fixed base 41 has a boss 413, and a first elastic member 414 is sleeved on the boss 413. The first elastic member 414 is a torsion spring. The movable protrusion 432 of the second locking member 43 has a beveled part 433 at the end away from the buckle 431. The two ends of the first elastic member 414 abut against the beveled part 433 respectively. Through the elastic force of the torsion spring, the second locking member 43 can automatically return to the initial position after the unlocking operation, avoiding repeated manual reset by the user and improving the convenience of operation.

[0037] like Figures 3 to 5 As shown, to prevent the second locking member 43 from going out of range during sliding, a locking pin 425 is also connected to the boss 413. The second locking member 43 has a limiting waist hole 434, and the locking pin 425 passes through the limiting waist hole 434, so that the second locking member 43 slides relative to the locking pin 425 through the limiting waist hole 434. The end of the locking pin 425 is provided with an anti-disengagement part 4251, which cooperates with the second locking member 43 to prevent disengagement. This structure ensures that the second locking member 43 can slide while limiting its maximum movement distance, preventing disengagement or excessive displacement, and ensuring that the locking structure 4 is stable and reliable.

[0038] like Figures 3 to 5 As shown, a second elastic element 45 is sleeved on the first crossbar 22. One end of the second elastic element 45 abuts against the first locking element 42, and the other end abuts against the fixed base 41. When the user releases the lock, the rebound force provided by the second elastic element 45 can automatically reset the first locking element 42. To improve the smoothness of engagement, the buckle 431 is provided with an upper guide slope 435, and the slot 421 is provided with a corresponding lower guide slope 426. When the first locking element 42 is reset, the upper guide slope 435 and the lower guide slope 426 can guide the buckle 431 into the slot 421 to achieve smooth engagement, reduce resistance, and prevent jamming.

[0039] like Figure 1 and Figure 2As shown, a third support 5 is rotatably provided at the connection end between the base 1 and the first support 2. The third support 5 is located outside the second support 3 and can form additional support when the trolley is unfolded, thereby improving the overall load-bearing capacity and structural strength. The third support 5 includes two sets of third support rods 51 arranged in parallel, a third connecting rod 52, and a third crossbar 53 arranged vertically between the two. The third support rods 51 and the third connecting rods 52 are connected by a spring 54, which gives the third support 5 a certain degree of flexibility, prevents the trolley from getting stuck during unfolding, and extends the overall service life of the trolley.

[0040] The basic working principle of this utility model is as follows: When the user needs to unfold the trolley, the first bracket 2 and the second bracket 3 are first unfolded outward around the base 1, so that the second crossbar 32 of the second bracket 3 gradually approaches the first crossbar 22 of the first bracket 2. At this time, the user pushes the second locking member 43 to disengage it from the slot 421, and then moves the lever part 427 of the first locking member 42 to temporarily separate the upper and lower locking hooks 429. The second crossbar 32 enters the locking groove 44 formed between the upper locking hook 412 and the lower locking hook 429. After the user releases the lever part 427, under the action of the rebound force of the second elastic member 45, the first locking member 42 automatically resets, and the upper... The lower locking hook 429 engages, completing the first layer of locking. Subsequently, the first elastic element 414 drives the second locking element 43 to reset along the slide groove 422, causing the buckle 431 to re-engage with the slot 421. At this point, the double locking is completed, and the two sets of brackets of the trolley are securely locked in the unfolded position. Even if subjected to vibration or impact, they will not loosen or deform. When the trolley needs to be folded, the user pushes the second locking element 43 again to separate the buckle 431 from the slot 421. Then, the user moves the lever part 427 to disengage the upper and lower locking hooks 429, releasing the double-layer locking structure. The first bracket 2 and the second bracket 3 can then rotate around the base 1 and axially retract inward to complete the folding.

[0041] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A double-locking structure for a trolley, comprising a base (1), a first bracket (2) and a second bracket (3) rotatably connected to both ends of the base (1), characterized in that: It also includes a locking structure (4), which includes a fixed base (41), a first locking member (42) and a second locking member (43). The fixed base (41) is fixed to the first bracket (2), the first locking member (42) is rotatably disposed on the first bracket (2), and a locking groove (44) is formed between the first locking member (42) and the fixed base (41). The second bracket (3) is locked in place with the locking groove (44). The second locking member (43) is slidably disposed on the fixed base (41). The second locking member is provided with a buckle (431), and the first locking member (42) is provided with a corresponding slot (421). The buckle (431) engages with the slot (421). The fixed base (41) is provided with a first elastic element (414), which has an elastic force that drives the buckle (431) of the second locking element (43) to remain in a locked state with the slot (421) of the first locking element (42).

2. The double-locking structure of a trolley according to claim 1, characterized in that: The second locking member (43) is provided with a movable protrusion (432), and the first locking member (42) is provided with a corresponding sliding groove (422). The movable protrusion (432) and the sliding groove (422) are slidably engaged.

3. The double-locking structure of a trolley according to claim 2, characterized in that: The fixed base (41) is provided with a boss (413), the first elastic member (414) is sleeved on the boss (413), the movable protrusion (432) is provided with a beveled part (433) at one end away from the buckle (431), and the two ends of the first elastic member (414) respectively abut against the beveled part (433).

4. The double-locking structure of a trolley according to claim 3, characterized in that: A locking pin (425) is connected to the boss (413). The second locking member (43) is provided with a limiting waist hole (434). The locking pin (425) passes through the limiting waist hole (434) so ​​that the second locking member (43) slides relative to the locking pin (425) through the limiting waist hole (434). The end of the locking pin (425) is provided with an anti-detachment part (4251), and the anti-detachment part (4251) cooperates with the second locking member (43) to prevent detachment.

5. The double-locking structure of a trolley according to claim 1, characterized in that: The buckle (431) is provided with an upper guide slope (435), and the slot (421) is provided with a lower guide slope (426) that cooperates with it.

6. The double-locking structure of a trolley according to claim 1, characterized in that: The first bracket (2) includes a first crossbar (22) and a first support rod (21) vertically connected to both sides of the first crossbar (22). The second bracket (3) includes a second crossbar (32) and a second support rod (31) vertically connected to both sides of the second crossbar (32). The first crossbar (22) is locked to the second crossbar (32) by the locking structure (4).

7. The double-locking structure of a trolley according to claim 6, characterized in that: The first locking member (42) includes an integrally formed lever part (427) and two external connecting parts (428), the external connecting parts (428) being rotatably mounted on the first crossbar (22); The fixing base (41) includes an integrally formed inner connecting part (411) and an upper locking hook (412). The inner connecting part (411) is fixed to the first crossbar (22) and located between the two outer connecting parts (428). The lever part (427) is provided with a lower locking hook (429), and the upper locking hook (412) is arranged opposite to the lower locking hook (429) to form the locking groove (44).

8. The double-locking structure of a trolley according to claim 6, characterized in that: A second elastic element (45) is sleeved on the first crossbar (22). One end of the second elastic element (45) abuts against the fixed seat (41), and the other end of the second elastic element (45) abuts against the fixed seat (41).

9. The double-locking structure of a trolley according to claim 1, characterized in that: The connection end between the base (1) and the first bracket (2) is also rotatably provided with a third bracket (5), which is located on the outside of the second bracket (3).

10. The double-locking structure of a trolley according to claim 9, characterized in that: The third support (5) includes a third crossbar (53) and a third support rod (51) and a third connecting rod (52) vertically arranged on both sides of the third crossbar (53). The third support rod (51) and the third connecting rod (52) are connected by a spring (54).

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