A trolley self-locking structure

Abstract

The utility model discloses a handcart self -locking structure, including the push handle set up in the car body, wheel, the wheel sets up self -locking structure, push handle inside sets up push handle pull rope fixed position, reset spring recess, notch, reset spring is located in reset spring recess, and one end of pull rope is fixed on push handle pull rope fixed position, and the other end of pull rope is connected to the self -locking structure through N pivot downward and passes through the car body, N is greater than 1, and the tubular structure is used in the car body upper end and is connected with push handle, and rivet A and rivet B pass through the notch, and push handle is fixed on the car body upper end, and push handle does reciprocating telescopic in the range of notch, can realize through this technical scheme: the parent pushes the handle when automatically unlocking the vehicle, and the hand of the parent leaves push handle and is automatically locked wheel, and does not rely on power and other external energy, realizes low cost, light weight, pure mechanical structure, firm and durable, maintenance -free and no radiation and other advantages.

Description

Technical Field

[0001] This utility model relates to the field of stroller technology, and in particular to a self-locking structure for strollers used in infant and toddler strollers. Background Technology

[0002] As an important tool for infants and toddlers' daily travel, the safety of strollers is always the focus of parents' attention. The braking system is the core component of safety performance. A reliable braking system can prevent strollers from moving unexpectedly, especially on slopes or uneven surfaces, providing crucial protection for babies.

[0003] The most cost-effective physical braking structure on the market is the locking pin and hub engagement system. Pressing the pedal causes a rotating ramp to push the locking pin horizontally until it inserts into a special hole on the hub, physically preventing the wheel from rotating. The advantage of this design is that the braking is absolutely reliable. Once locked, the wheel cannot move unless manually released. The disadvantage is that long-term use may cause wear on the locking pin or hub hole, affecting the locking effect. Also, it usually requires a large pedaling force to operate.

[0004] Existing strollers use passive braking, requiring parents to press a pedal to lock. However, in real-world scenarios, stroller rollover accidents frequently occur due to parental negligence, causing fatal injuries to infants. Many rollovers happen because parents take their hands off the handlebars and forget to press the brake pedal. Other accidents may occur because older siblings or other minors are pushing the stroller, posing a potential risk. Therefore, the existing stroller locking mechanism has become a major safety hazard, urgently requiring a structure that can actively lock the stroller and prevent wheel slippage at all times to ensure the infant's safety.

[0005] Recently, a self-locking function driven by an electric motor has appeared on the market, but it is expensive, and the weight of the vehicle is greatly increased due to the addition of components such as a drive motor, gearbox, and battery pack. In addition, the battery life is limited, and if it is not charged, the wheels will become free wheels, leaving the baby unprotected, thus greatly reducing its practicality.

[0006] Given that most mainstream strollers on the market use telescopic or rotary handles to adjust the handle height, this utility model provides a low-cost, lightweight, safe, and reliable mechanical active locking structure for these two types of handles. The main purpose of this utility model is to provide an automatic locking structure. Utility Model Content

[0007] In view of the above situation and to overcome the defects of the existing technology, this utility model provides a self-locking structure for a handcart. It adopts a simple mechanical structure, does not increase the weight of the cart, and requires no charging or maintenance, thereby realizing the automatic locking function of the handcart.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A self-locking structure for a handcart includes a push handle and wheels mounted on the cart body. The wheels are equipped with a self-locking structure. The push handle has a push handle pull rope fixing position, a return spring groove, and a slot. The return spring is located in the return spring groove. One end of the pull rope is fixed at the push handle pull rope fixing position. The other end of the pull rope passes downward through the cart body via N rotating shafts and is connected to the self-locking structure, where N is greater than 1. The upper end of the cart body is connected to the push handle using a tubular structure. Rivets A and B pass through the slot to fix the push handle to the upper end of the cart body. The push handle reciprocates within the range of the slot.

[0010] The self-locking structure includes a brake gear installed on the inner side of the wheel, a brake mounting plate fixed to the lower end of the wheel, and one end of the locking tongue fitted onto the rotating shaft of the brake mounting plate through a rotating shaft hole, moving in an arc with the rotating shaft as the center.

[0011] In the above technical solution, a torsion spring is installed between the brake mounting disc and the locking tongue. One inner arm of the torsion spring is fixed to the brake mounting disc, and the other end is connected to the locking tongue. Under the torque of the torsion spring, the locking tongue moves towards the brake gear and engages in the teeth of the brake gear to prevent the wheel from rotating and complete the braking action.

[0012] In the above technical solution, the brake gear is concentrically arranged with the wheel and fixed on the inner side of the wheel, facing the side of the vehicle body.

[0013] In the above technical solution, the locking tongue is fixed to the wheel end at the lower end of the vehicle body, specifically the outer side of the vehicle body. The locking tongue is located between the vehicle body and the wheel, and the locking tongue is located around the outer circle of the brake gear.

[0014] In the above technical solution, the lower end of the reset spring groove is provided with an opening, and the groove through which the rivet B moves coincides with the opening; the two ends of the reset spring act on the reset spring groove and the rivet B respectively.

[0015] In the above technical solution, the latch is provided with a pivot hole and a latch pull rope fixing hole.

[0016] In the above technical solution, the push handle pull rope fixing component is provided with a spring fixing post, a pull rope pivot, a rivet fixing hole, a pull rope fixing post, and a card fixing post. The upper end of the pull rope is fixed to the pull rope fixing post, passes around the pull rope pivot, the card pivot, and the vehicle body pivot, and then connects to the locking tongue at the lower end of the vehicle body. The card fixing post passes through the card slot and fixes the adjustment card to the push handle pull rope fixing component. The push handle pull rope fixing component is fixed to the lower end of the push handle through the rivet fixing hole. The adjustment card is fixed inside the push handle pull rope fixing component. The adjustment card is provided with a locking tooth, and the upper end of the vehicle body is provided with a locking position that cooperates with the locking tooth.

[0017] In the above technical solution, the adjustment card is provided with a card rotation shaft, a card spring fixing post, a card slot, and an action pull rope post; the card rotation shaft and the vehicle body rotation shaft at the upper end of the fixed vehicle body act as a pull rope, and the two ends of the reset spring are respectively connected to the spring fixing post on the push handle pull rope fixing component and the card spring fixing post on the adjustment card.

[0018] In the above technical solution, a conduit is installed outside the pull rope, and the conduit is located outside the vehicle body.

[0019] In the above technical solution, the brake mounting disc is fixed at the connection between the vehicle body and the push handle, and the push handle is fixed to the brake mounting disc via a rotating shaft.

[0020] In the above technical solution, the brake mounting plate is fixed to the push handle connection of the vehicle body, and a rotating shaft is provided on the brake mounting plate. The pull rope is connected to the handlebar through the rotating shaft.

[0021] This technical solution enables the vehicle to automatically unlock when the parent pushes the handlebars and automatically lock the wheels when the parent removes their hand from the handlebars. It does not rely on external energy sources such as electricity, and has the advantages of low cost, light weight, simple mechanical structure, sturdiness and durability, maintenance-free and radiation-free operation.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the embodiment;

[0024] Figure 2 This is a schematic diagram of the push handle in an embodiment;

[0025] Figure 3 This is an enlarged structural diagram of the push handle in an embodiment;

[0026] Figure 4 This is a schematic diagram of the exploded structure of an embodiment;

[0027] Figure 5 This is a schematic diagram of the handlebar structure for an embodiment;

[0028] Figure 6 This is a schematic diagram of the vehicle body structure in an embodiment;

[0029] Figure 7 A schematic diagram of the cable fixing structure for the vehicle body push handle in an embodiment;

[0030] Figure 8 This is a schematic diagram of the push handle pull rope fixing component in the embodiment;

[0031] Figure 9 This is a schematic diagram of the push handle pull rope fixing component in the embodiment;

[0032] Figure 10 This is a schematic diagram of the push handle pull rope fixing component in the embodiment;

[0033] Figure 11 This is a schematic diagram of the push handle pull rope fixing component in the embodiment;

[0034] The components include: push handle 1, vehicle body 2, rivet A 201, rivet B 202, brake mounting disc 203, brake mounting disc cover 204, vehicle body pivot 207, wheel 3, brake gear 4, axle 5, pull rope 6, return spring 7, return spring groove 701, torsion spring 8, locking tongue 9, pivot hole 901, locking tongue pull rope fixing hole 902, push handle pull rope fixing position 101, pivot 102, slot 103, adjusting card 11, card pivot 1101, card spring fixing post 1102, card slot 1103; function pull rope post 1104; push handle pull rope fixing part 12, spring fixing post 1201, pull rope pivot 1202, rivet fixing hole 1203, pull rope fixing post 1204; card fixing post 1205, vehicle body pivot 13. Detailed Implementation

[0035] To further illustrate the technical means and effects of this utility model in achieving its intended purpose, the specific implementation methods, structural features and effects of this utility model are described in detail below with reference to the accompanying drawings and embodiments.

[0036] A self-locking structure for a handcart includes a push handle mounted on the cart body. The push handle and the cart body are retractable movable structures. The upper end of the cart body is connected to the push handle via a tubular structure. Specifically, the upper end of the cart body 2 is connected to the push handle 1 via a tubular structure. The lower end of the push handle 1 can be inserted into the tubular structure at the upper end of the cart body 2. Rivets A 201 and B 202 pass through a slot 103 to fix the push handle 1 to the upper end of the cart body 2. The push handle 1 can reciprocate within the range of the slot 103.

[0037] A return spring groove 701 is provided inside the push handle. The lower end of the return spring groove 701 is provided with an opening. The rivet B 202 can move along the slot 103 and pass through the opening to act on the return spring 7, causing it to deform and store potential energy. The return spring 7 is located inside the return spring groove 701. The upper end acts on the return spring groove 701 on the push handle 1, and the lower end acts on the rivet B 202. When the push handle is pushed without external force, the push handle and the vehicle body are in an extended state.

[0038] The push handle is equipped with a push handle pull rope fixing position 101. The upper end of the pull rope 6 is fixed on the push handle pull rope fixing position 101. The other end of the pull rope 6 is connected to the rivet A 201 through four rotating shafts 102 to form a pulley group to increase the movement distance of the pull rope. The lower end of the pull rope 6 passes downward through the 902 pull rope fixing position on the vehicle body 2 and the locking tongue 9.

[0039] A brake gear 4 is provided on the inner side of the wheel. The brake mounting disc is closed as one piece with the brake mounting disc cover and fixed to the lower end of the wheel of the vehicle body. The brake gear 4 and the wheel 3 are concentrically arranged and have an axle hole through them. The axle 5 fixes the wheel 3 and the brake gear 4 to the vehicle body through the axle hole. The wheel 3 and the brake gear 4 can rotate along the axle 5.

[0040] Example 1: The brake mounting disc is fixed to the lower end of the vehicle body 2 in the direction of the wheel 3. The locking tongue 9 is fixed to the rotating shaft of the brake mounting disc 203 through the rotating shaft hole 901. With the rotating shaft as the center, it moves in an arc. The locking tongue 9 is located on the outer circumference of the brake gear 4 and is in the same plane as the brake gear 4. A torsion spring 8 is installed between the brake mounting disc and the locking tongue. One inner arm of the torsion spring is fixed to the brake mounting disc 203, and the other end is connected to the locking tongue 9, so that the locking tongue 9 rotates towards the brake gear 4 without external force and gets into the tooth gap of the brake gear 4 to prevent the wheel from rotating and realize the braking action.

[0041] When the push handle 1 is manually pushed, it moves along the slot 103 toward the vehicle body 2 and interacts with rivet B 202 to compress the return spring 7, storing potential energy. Simultaneously, rivet A 201 interacts with the pivot 102 to pull the rope 6. To further extend the rope's movement distance and increase the stretching effect, multiple rivets A 201 and pivots 102 can be added. The rope 6 pulls the locking tongue 9, causing it to rotate away from the brake gear 4 along the 901 rotating hole, disengaging the locking tongue 9 from the brake gear 4. When the push handle 1 is manually released, the potential energy of the return spring 7 acts on the return spring groove 701 and rivet B 202, causing the push handle to move away from the vehicle body 2 along the slot 103 under the force of the return spring 7, reaching an extended state. Simultaneously, rivet A 201 and pivot 102 release the rope 6. Under the force of the torsion spring 8, the locking tongue 9 rotates in the opposite direction along the rotating hole 901, causing the locking tongue 9 to engage with the brake gear 4, thereby locking the wheel 3 so that it cannot rotate and fixing the vehicle body on the inclined road surface.

[0042] As a further preferred embodiment, a 205 brake mounting disc is added between the push handle 1 and the vehicle body 2. The push handle is fixed to the 205 brake mounting disc via a pivot and can rotate around the center of the 205 brake mounting disc to adjust its height. The brake mounting disc is fixed at the connection between the vehicle body 2 and the push handle 1. The 205 brake mounting disc is provided with a rotatable pivot 206. The pull rope 6 is connected to the handlebars via the pivot 206. The pivot is located below the pivot of the push handle 1 to compensate for the insufficient length of the pull rope 6 when the push handle 1 is rotated downwards during the height adjustment.

[0043] Example 2: The push handle pull rope fixing component is fixed to the lower end of the push handle 1 through the rivet fixing hole 1203. The adjusting card 11 is fixed inside the push handle pull rope fixing component. By adjusting the card's teeth and cooperating with the card positions at different positions on the upper part of the vehicle body, the height of the push handle can be adjusted.

[0044] The push handle pull rope fixing component is equipped with a spring fixing post, a pull rope pivot, a rivet fixing hole, a pull rope fixing post, and a card fixing post. The upper end of the pull rope is fixed to the pull rope fixing post, passes around the pull rope pivot, the card pivot, and the vehicle body pivot, and then connects to the locking tongue at the lower end of the vehicle body. The card fixing post passes through the card slot and fixes the adjustment card to the push handle pull rope fixing component. The push handle pull rope fixing component is fixed to the lower end of the push handle through the rivet fixing hole. The adjustment card is fixed inside the push handle pull rope fixing component. The adjustment card is equipped with a locking tooth, and the upper end of the vehicle body is equipped with a locking position that cooperates with the locking tooth.

[0045] The lower end of the adjustment card is equipped with a card rotating shaft 1101, a card spring fixing post 1102, a card slot 1103, and an action pull rope post 1104. The push handle pull rope fixing component is equipped with a spring fixing post 1201, a pull rope rotating shaft 1202, a rivet fixing hole 1203, a pull rope fixing post 1204, and a card fixing post 1205. The upper end of the pull rope is fixed to the pull rope fixing post 1204, passes around the pull rope rotating shaft 1202, the card rotating shaft 1101, and the vehicle body rotating shaft 13, and connects to the locking tongue 9 at the lower end of the vehicle body. The card fixing post 1205 passes through the card slot 1103, fixing the adjustment card 11 to the push handle pull rope fixing component, and can move up and down along the position of the card slot 1103.

[0046] When the parent pushes the handle, the 1104 pull rope action column on the card 11 is adjusted, which pulls the rope 6 downward, causing the rope to retract and thus pull the locking tongue 9 at the bottom of the vehicle body, unlocking the wheels.

[0047] When adjusting the height of push handle 1 by adjusting card 11, card pivot 1101 interacts with the vehicle body pivot fixed to the upper end of the vehicle body 2 to pull the rope, which can tighten the rope. Since the adjustment height of handle 1 is consistent with the distance moved by adjusting card 11, and the distance moved by card pivot 1101 and vehicle body pivot is equal to the adjustment distance of handle 1, the automatic adjustment of the rope ensures that the locking function is not affected and no additional adjustment is required. One end of the return spring 7 is connected to the spring fixing post 1201 on the push handle rope fixing component, and the other end is connected to the card spring fixing post on adjusting card 11. When push handle 1 is released, under the force of the return spring 7, adjusting card 11 and 12 rope fixing components return to their initial positions, releasing the rope 6, which in turn releases the locking tongue 9 to lock the wheel, thus returning push handle 1 and vehicle body 2 to their initial positions.

[0048] To protect the pull rope 6, a conduit can be installed outside the pull rope 6, with the pull rope 6 located inside the conduit, which can be located outside the vehicle body 2.

[0049] As a further preferred embodiment, a ball frame is fixed to the upper end of the vehicle body 2, and rollers are provided on the ball frame to reduce friction and make it easier when the push handle retracts. The vehicle body pivot 207 can be further provided on the ball frame.

[0050] The above embodiments are merely one of the preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but solve the same technical problem as this utility model, should be included within the scope of protection of this utility model.

Claims

1. A self-locking structure for a handcart, characterized in that: The device includes a push handle and wheels mounted on the vehicle body. The wheels are equipped with a self-locking structure. The push handle has a push handle pull rope fixing position, a return spring groove, and a slot. The return spring is located in the return spring groove. One end of the pull rope is fixed at the push handle pull rope fixing position. The other end of the pull rope passes downward through the vehicle body via N rotating shafts and is connected to the self-locking structure. N is greater than 1. The upper end of the vehicle body is connected to the push handle using a tubular structure. Rivets A and B pass through the slot to fix the push handle to the upper end of the vehicle body. The push handle reciprocates within the range of the slot. The self-locking structure includes a brake gear installed on the inner side of the wheel, a brake mounting plate fixed to the lower end of the wheel, and one end of the locking tongue fitted onto the rotating shaft of the brake mounting plate through a rotating shaft hole, moving in an arc with the rotating shaft as the center.

2. The self-locking structure for a handcart according to claim 1, characterized in that: A torsion spring is installed between the brake mounting disc and the locking tongue. One inner arm of the torsion spring is fixed to the brake mounting disc, and the other end is connected to the locking tongue. Under the torque of the torsion spring, the locking tongue moves towards the brake gear and engages in the teeth of the brake gear to prevent the wheel from rotating and complete the braking action.

3. The self-locking structure for a handcart according to claim 2, characterized in that: The brake gear is concentrically mounted with the wheel and fixed to the inside of the wheel, facing the side of the vehicle body.

4. The self-locking structure for a handcart according to claim 3, characterized in that: The locking tongue is fixed to the wheel end at the lower end of the vehicle body, specifically on the outer side of the vehicle body. The locking tongue is located between the vehicle body and the wheel, and is located around the outer circumference of the brake gear.

5. The self-locking structure for a handcart according to claim 4, characterized in that: The lower end of the reset spring groove is provided with an opening, and the groove through which the rivet B moves coincides with the opening; the two ends of the reset spring act on the reset spring groove and the rivet B respectively.

6. The self-locking structure for a handcart according to claim 1, characterized in that: The lower end of the push handle is fixed with a push handle pull rope fixing component through rivet fixing holes. The push handle pull rope fixing component is equipped with a spring fixing post, a pull rope pivot, rivet fixing holes, a pull rope fixing post, and a card fixing post. The upper end of the pull rope is fixed to the pull rope fixing post, passes around the pull rope pivot, the card pivot, and the vehicle body pivot, and then connects to the locking tongue at the lower end of the vehicle body. The card fixing post passes through the card slot to fix the adjustment card to the push handle pull rope fixing component. The push handle pull rope fixing component is fixed to the lower end of the push handle through rivet fixing holes. An adjustment card is fixed inside the push handle pull rope fixing component. The adjustment card is equipped with a locking tooth. The upper end of the vehicle body is equipped with a locking position that cooperates with the locking tooth.

7. The self-locking structure for a handcart according to claim 6, characterized in that: The adjustment card is equipped with a card rotation shaft, a card spring fixing post, a card slot, and an action pull rope post; the card rotation shaft and the vehicle body rotation shaft at the upper end of the fixed vehicle body work together to pull the rope, and the two ends of the reset spring are respectively connected to the spring fixing post on the push handle pull rope fixing part and the card spring fixing post on the adjustment card.

8. The self-locking structure for a handcart according to claim 1, characterized in that: The pull rope is fitted with a conduit outside the vehicle body.

9. The self-locking structure for a handcart according to claim 1, characterized in that: The brake mounting disc is fixed at the connection between the vehicle body and the push handle. The push handle is fixed to the brake mounting disc via a rotating shaft. The brake mounting disc is fixed at the push handle connection of the vehicle body. The brake mounting disc is provided with a rotating shaft, and the pull rope is connected to the handlebars via the rotating shaft.

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