Locking mechanism for basket and trolley and trolley system with basket

Abstract

This invention discloses a locking mechanism for a basket and a trolley, as well as a trolley system with a basket. It constructs a dual-lock composite mechanism with state memory, achieving intelligent locking logic that allows for one-button unlocking and maintaining the unlocked state, and automatic reset upon basket lifting. It utilizes the linkage between the two locking slots of the main lock and the protrusion of the secondary lock—the protrusion's slot position shifts during the rotation of the main lock hook, combined with the reverse blocking function of a unidirectional ridge, ensuring the main lock automatically locks in the disengaged position after unlocking, eliminating the need for continuous pressing by the operator. Only when the basket is lifted and the secondary lock resets under the action of the second spring does the protrusion return to its initial position via a transition slot, restoring the entire mechanism to a ready-to-lock state. This simplifies the operation, allowing users to press buttons and lift the basket with one hand, significantly improving ease of use and safety.

Description

Technical Field

[0001] This invention relates to the technical field of strollers, and more specifically to a locking mechanism for a basket and a stroller, and a stroller system having the locking mechanism. Background Technology

[0002] Infant carriers, as an important means of transporting infants and toddlers, typically need to be used in conjunction with brackets or interfaces on stroller frames. To ensure safety, a reliable locking mechanism must be installed between the carrier and the stroller to prevent the carrier from accidentally detaching during movement.

[0003] Currently, most common baby carrier locking mechanisms on the market use a single-stage locking hook structure, where a spring drives the hook to engage with the locking mechanism on the bracket. While this single-stage locking mechanism is simple, unlocking requires the user to continuously press the unlock button while simultaneously pulling the baby carrier upwards. Once released, the hook immediately resets under spring pressure and re-engages with the locking mechanism. This makes it difficult for the operator, especially parents holding infants, to use one hand to complete the separation action, resulting in operational inconvenience.

[0004] To address the aforementioned challenges of single-handed operation, some technologies have been improved. For example, Chinese patent document CN223031048U proposes a quick-release mechanism based on a basket trolley, which adds a release and retention component to the traditional locking hook.

[0005] However, the aforementioned patents still have many shortcomings: Firstly, its release mechanism relies on the bracket to forcefully push open the elastic push plate. If the insertion angle or force is improper, the external force may not be sufficient to overcome the spring force, which may cause the linkage shaft to fail to disengage and form a "false lock," posing a safety hazard.

[0006] Secondly, the elastic push plate is prone to fatigue fracture. This cantilever thin-walled structure undergoes frequent elastic deformation during repeated insertion and removal, posing a risk of fracture with long-term use and affecting the product's service life.

[0007] Third, the user experience is poor. Unlocking requires continuously pressing the button until the linkage engages, and it cannot be pressed and held, making one-handed operation neither convenient nor smooth. Summary of the Invention

[0008] The existing locking mechanism between the basket and the trolley has a relatively complex release and retention component structure. After long-term use, the wear of the components can easily lead to locking failure or poor reset, resulting in insufficient locking reliability. In addition, the existing locking mechanism usually requires simultaneous unlocking from both sides. If the unlocking actions on both sides are not synchronized, a jamming phenomenon may occur where one side is unlocked while the other side is still locked, making it difficult to disassemble the basket with one hand.

[0009] This invention provides a locking mechanism for a basket and a trolley, aiming to solve the technical problems of insufficient reliability of the locking mechanism's release and retention structure in the prior art, and the unsmooth disassembly caused by asynchronous unlocking on both sides.

[0010] The technical solution adopted by this invention to solve the above-mentioned technical problem is: a locking mechanism between the basket and the trolley, used for connecting the bracket and the interface. The bracket is provided with an abutment part and a locking part; the interface is provided with a two-lock assembly, which includes a main lock and a secondary lock; The main lock includes an exposed operating part and a locking hook. The main lock is rotatably mounted on the interface and equipped with a first spring. The lower end of the locking hook is provided with a hook portion. Under the action of the first spring, the hook portion keeps hooked on the corresponding locking part. Operating the main lock can disengage the hook portion from the locking part. The locking hook is provided with a first locking groove and a second locking groove that are spaced apart by a unidirectional ridge, and the first locking groove and the second locking groove are connected by a transition groove. The secondary lock includes a base and an arm with a protrusion at the end; a second spring is disposed on the upper side of the base; When the interface is inserted into the bracket, the abutting part presses against the base, the second spring is compressed, the protrusion is located in the first locking groove, and the hook hooks the corresponding locking part under the action of the first spring. When the operating part is pressed, the main lock rotates, the hook part disengages from the lock part, the protrusion passes over the one-way ridge to the second lock groove and is restricted by the one-way ridge in the opposite direction, and the rotation of the main lock is restricted so that the hook part remains disengaged from the lock part; When the interface disengages from the bracket, the secondary lock is reset by the action of the second spring, and the protrusion returns from the second groove through the transition groove to the position below the first groove.

[0011] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the base is provided with a waist-shaped hole, and a shaft pin is inserted into the waist-shaped hole so that the secondary lock can move up and down relative to the main lock.

[0012] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the unidirectional ridge has a first inclined wall located on the first locking groove side and a first vertical wall located on the second locking groove side.

[0013] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is: the protrusion has a second inclined wall that cooperates with the first inclined wall and a second vertical wall that cooperates with the first vertical wall.

[0014] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is as follows: the locking part is located below the abutting part, and the locking part includes a transverse connecting arm and an action arm that slopes from top to bottom toward the hook part.

[0015] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is that the locking hook of the main lock and the arm of the secondary lock are both inclined in a direction away from the lock part.

[0016] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is as follows: in the initial state and in the locked state of the lock hook and lock part, the extension direction of the unidirectional ridge is inclined relative to the insertion direction of the interface, and opposite to the extension direction of the arm of the secondary lock.

[0017] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is as follows: the first spring is a tension spring connected to the upper part of the main lock and located on the side away from the lock part.

[0018] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: the middle of the working arm is hollowed out.

[0019] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a trolley system with a basket, including a trolley and a basket, each side of the trolley is provided with a bracket, the basket is provided with an interface on each side, and the locking mechanism between the basket and the trolley is provided between one or both brackets and interfaces.

[0020] Compared with existing technologies, the advantages of this invention are as follows: This invention constructs a dual-lock composite mechanism with state memory function, realizing an intelligent locking logic of one-button unlocking and maintaining the unlocked state, and automatic reset and standby after the basket is lifted. It utilizes the linkage between the two locking grooves of the main lock and the protrusion of the secondary lock—the groove position jump of the secondary lock protrusion during the rotation of the main lock hook, combined with the reverse blocking function of the unidirectional ridge, ensures that the main lock automatically locks in the disengaged position after unlocking, without requiring continuous pressing by the operator. Only when the basket is lifted and the secondary lock resets under the action of the second spring does the protrusion return to its initial position through the transition groove, restoring the entire mechanism to the lockable state. This simplifies the operation steps, allowing users to press the button with one hand and lift the basket with the other, significantly improving the convenience and safety of use. Attached Figure Description

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0022] Figure 1 This is a three-dimensional schematic diagram of the trolley system in the preferred embodiment; Figure 2 This is an exploded view of the cart system in the preferred embodiment; Figure 3 This is a schematic diagram of the basket of the trolley system in a preferred embodiment; Figure 4 An exploded view of the locking mechanism between the basket and the trolley in the preferred embodiment; Figure 5 This is a schematic diagram of the main lock of the locking mechanism for the basket and trolley in the preferred embodiment. Figure 1 ; Figure 6 This is a schematic diagram of the main lock of the locking mechanism for the basket and trolley in the preferred embodiment. Figure 2 ; Figure 7 This is a schematic diagram of the secondary lock of the locking mechanism between the basket and the trolley in the preferred embodiment. Figure 1 ; Figure 8 This is a schematic diagram of the secondary lock of the locking mechanism between the basket and the trolley in the preferred embodiment. Figure 2 ; Figure 9 This is a cross-sectional view of the locking mechanism in the preferred embodiment when the basket is detached from the trolley. Figure 10 This is a cross-sectional view of the locking mechanism in the locked state when the basket and trolley are connected in the preferred embodiment. Figure 11 This is a schematic diagram showing the locking mechanism in the unlocked state when the basket and trolley are connected in the preferred embodiment. Figure 12 This is a schematic diagram showing the basket and trolley locking mechanism in the locked state in the preferred embodiment; Figure 13 This is a partial schematic diagram showing the basket and trolley locking mechanism in the locked state in a preferred embodiment.

[0023] Basket 200; trolley 100; bracket 1; interface 2; contact part 11; locking part 12; main lock 21; secondary lock 22; operating part 211; locking hook 212; first spring 30; hook part 210; one-way ridge 201; first locking groove 202; second locking groove 203; transition groove 204; base 221; protrusion 220; arm part 222; second spring 40; waist-shaped hole 205; shaft pin 50; first inclined wall 101; first vertical wall 102; second inclined wall 103; second vertical wall 104; transverse connecting arm 121; actuating arm 122. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figure 1-3 As shown, this embodiment provides a trolley system with a basket 200, including a trolley 100 and a basket 200.

[0026] like Figure 1-3 As shown, a bracket 1 is provided on each side of the trolley 100, and an interface 2 is provided on each side of the basket 200. The locking mechanism between the basket 200 and the trolley 100 is located between one or both brackets 1 and interfaces 2. Of course, the bracket 1 is not necessarily located on the trolley 100, and the interface 2 is not necessarily located on the basket 200. Their positions can be interchanged. In this embodiment, for the sake of clearer expression of the technical solution, the bracket 1 refers to the component on the trolley 100 used to support the basket 200.

[0027] like Figure 4-12 As shown, the locking mechanism between the basket 200 and the trolley 100 is used to connect the bracket 1 on the trolley 100 and the interface 2 on the basket 200. The bracket 1 is provided with an abutment part 11 and a locking part 12; the interface 2 is provided with a double-lock assembly, which includes a main lock 21 and a secondary lock 22.

[0028] like Figure 4-12 As shown, the main lock 21 includes an exposed operating part 211 and a locking hook 212. The main lock 21 is rotatably mounted on the interface 2 and equipped with a first spring 30. The lower end of the locking hook 212 has a hook portion 210. Under the action of the first spring 30, the hook portion 210 keeps hooked on the corresponding locking part 12. Operating the main lock 21 can disengage the hook portion 210 from the locking part 12. The locking hook 212 has a first locking groove 202 and a second locking groove 203 separated by a unidirectional ridge 201. The first locking groove 202 and the second locking groove 203 are connected by a transition groove 204. The secondary lock 22 includes a base 221 and an arm portion 222 with a protrusion 220 at the end. A second spring 40 is disposed on the upper side of the base 221.

[0029] In this embodiment, the locking mechanism between the basket 200 and the trolley 100 achieves state memory through the timing linkage of the main lock 21 and the secondary lock 22.

[0030] like Figure 9 As shown, in the initial state, the protrusion 220 of the secondary lock 22 in interface 2 is located below the first lock groove 202 of the main lock 21, and the main lock 21 has the ability to rotate.

[0031] like Figure 10 As shown, when the interface 2 is inserted into the bracket 1, the contact part 11 presses against the base 221, the second spring 40 is compressed, and the protrusion 220 is located in the first locking groove 202. Under the action of the first spring 30, the hook 210 at the lower end of the main lock 21 hook 212 remains hooked to the locking part 12 of the bracket 1, and the basket 200 and the trolley 100 are firmly locked.

[0032] like Figure 11 As shown, when the user presses the operating part 211, the main lock 21 rotates, overcoming the force of the first spring 30 to rotate around its axis. The hook part 210 disengages from the lock part 12 as the main lock 21 rotates. Simultaneously, the rotation of the main lock 21 causes the first locking groove 202 on it to move relative to the protrusion 220 of the secondary lock 22. Since the protrusion 220 is constrained on the secondary lock 22 and cannot rotate with the main lock 21, the protrusion 220 and the first locking groove 202 generate relative movement. As the rotation angle of the main lock 21 increases, the protrusion 220 slides along the groove wall of the first locking groove 202, eventually crossing the one-way ridge 201 and falling into the second locking groove 203. The specific shape of the one-way ridge 201 ensures that the protrusion 220 can only slide from the first locking groove 202 side to the second locking groove 203 side, while the reverse direction is blocked.

[0033] After the protrusion 220 enters the second locking groove 203, it is restricted by the reverse movement of the one-way ridge 201 and cannot slide back to the first locking groove 202 on its own. Therefore, even if the operator releases the operating part 211, when the main lock 21 attempts to reset under the action of the first spring 30, the rotational stroke of the main lock 21 is restricted because the protrusion 220 is stuck in the second locking groove 203, and its hook 210 cannot re-hook the locking part 12, thus achieving the retention of the disengaged state memory.

[0034] When the operator lifts the basket 200 upwards, the interface 2 separates from the bracket 1. At this time, the abutment part 11 of the bracket 1 no longer presses against the base 221 of the secondary lock 22. The secondary lock 22 returns to its original position under the elastic force released by the second spring 40. This movement causes the protrusion 220 to move from the position of the second lock groove 203 to the position aligned with the transition groove 204, and then slide along the transition groove 204 into the lower part of the first lock groove 202. At this time, the rotational constraint of the main lock 21 is released, the first spring 30 drives the main lock 21 to return to its original position, the hook part 210 returns to the standby position, and the entire mechanism returns to its initial state.

[0035] Through the above structure, this embodiment provides a locking mechanism for a basket 200 and a trolley 100 with a one-button unlocking and detachment function. The user only needs to press the operating part 211 once, and the locking hook 212 will remain detached from the locking part 12, allowing the basket 200 to be lifted from the trolley 100 without continuous force. After the basket 200 is detached, the mechanism automatically resets, preparing for the next locking action. This structure simplifies the operation steps and significantly improves ease of use and safety.

[0036] like Figure 7-12 As shown, the base 221 has a waist-shaped hole 205, and a pin 50 passes through the waist-shaped hole 205 to allow the secondary lock 22 to move up and down relative to the main lock 21. The length direction of the waist-shaped hole 205 is consistent with the movement direction of the secondary lock 22 (i.e., the insertion and removal direction of the interface 2), and the secondary lock 22 is movably connected to the interface 2 via the pin 50. By opening the waist-shaped hole 205 in the base 221 of the secondary lock 22 and cooperating with the pin 50, precise guidance and stroke limit are provided for the up and down movement of the secondary lock 22, ensuring that the movement trajectory of the secondary lock 22 under the action of the second spring 40 is stable and reliable, thereby ensuring that the protrusion 220 can move accurately along the first lock groove 202, the second lock groove 203 and the transition groove 204, and improving the reliability of the mechanism's operation.

[0037] like Figure 5-6 As shown in Figures 1 and 13, preferably, the unidirectional ridge 201 has a first inclined wall 101 located on the side of the first locking groove 202 and a first vertical wall 102 located on the side of the second locking groove 203.

[0038] When the main lock 21 rotates, and the protrusion 220 moves along the first lock groove 202 towards the second lock groove 203, the protrusion 220 contacts the first inclined wall 101. The first inclined wall 101 decomposes the horizontal force generated by the rotation of the main lock 21 into a normal force perpendicular to the wall surface and a tangential force along the wall surface. Under the action of the tangential force, the protrusion 220 overcomes part of the pressure of the second spring 40, climbs up the slope, and crosses the ridge. After the protrusion 220 crosses the ridge and falls into the second lock groove 203, if the main lock 21 attempts to rotate in the opposite direction under the action of the first spring 30, the protrusion 220 will contact the first vertical wall 102. At this time, the vertical wall does not generate any force that causes the protrusion 220 to climb upward, but instead completely converts the pressure into a normal force, forming a mechanical self-locking mechanism. Since the protrusion 220 cannot cross the vertical wall on its own, the main lock 21 is reliably restricted to the unlocked position.

[0039] like Figure 7-8 As shown in Figure 13, more preferably, the protrusion 220 has a second inclined wall 103 that cooperates with the first inclined wall 101 and a second vertical wall 104 that cooperates with the first vertical wall 102. The second inclined wall 103 of the protrusion 220 and the first inclined wall 101 of the unidirectional ridge 201 form a surface contact engagement during the crossing process. The complementary inclined surfaces can more efficiently convert the rotational motion of the main lock 21 into the lifting motion of the protrusion 220. When blocking in the reverse direction, the second vertical wall 104 forms a surface contact vertical abutment with the first vertical wall 102, resulting in a more stable blocking effect and preventing damage or disengagement of parts due to excessive local stress.

[0040] like Figure 7-11As shown, the hook 212 of the main lock 21 and the arm 222 of the secondary lock 22 are both inclined away from the lock part 12. The hook 212's inclination away from the lock part 12 means that, in the initial state, the main body of the hook 212 is not directly above the lock part 12, but rather to its side and above. This provides a wide passage for the lock part 12 to enter and exit, avoiding motion interference. In the locked state, when the basket 200 is subjected to an upward force, the inclined hook 212 decomposes this force into a component along the hook 212 axis and a component perpendicular to the axis. The component along the axis acts on the rotation center of the main lock 21 and does not generate torque; while the component perpendicular to the axis generates a torque that further tightens the main lock 21, i.e., a self-locking effect. This design improves the reliability of the locking and avoids accidental disengagement due to vibration.

[0041] like Figure 9-10 As shown, in the initial state and when the hook 212 and lock part 12 are locked, the extension direction of the unidirectional ridge 201 is inclined relative to the insertion direction of the interface 2, and opposite to the extension direction of the arm 222 of the secondary lock 22. This makes the unidirectional ridge 201 appear vertical when the hook 212 is in the state, which is more conducive to the passage of the protrusion 220. When the protrusion 220 is located in the second lock groove 203, the unidirectional ridge 201 has a tendency to tilt again, and this tendency is opposite to the tilt direction of the arm 222 of the secondary lock 22. This cross-tilting layout makes the interaction force between the protrusion 220 of the secondary lock 22 and the lock groove of the main lock 21 more reasonable when the mechanism is subjected to external force, further enhancing the stability of the locking state and preventing accidental state switching due to misoperation or vibration.

[0042] At the same time, this design ensures that when the hook 210 and the lock 12 are locked, the protrusion 220 is stably pressed into the first lock groove 202. And because the tilting directions are opposite, when the protrusion 220 is subjected to an impact force along the insertion direction, it tends to be pressed into the bottom of the first lock groove 202 rather than sliding into the one-way ridge 201, thus playing a safety role in preventing accidental triggering.

[0043] like Figure 9 As shown, the locking part 12 is located below the abutting part 11. The locking part 12 includes a transverse connecting arm 121 and an action arm 122 that slopes from top to bottom toward the hook part 210.

[0044] When the operator lowers the basket 200 onto the trolley 100, the hook 210 of the locking hook 212 first contacts the actuating arm 122 of the locking part 12. Since the actuating arm 122 slopes downwards towards the hook 210, its inclined surface forms a wedge-shaped fit with the hook 210. As the basket 200 continues to descend, the hook 210 slides along the inclined surface of the actuating arm 122. According to the force decomposition on the inclined surface, the hook 210 experiences a normal force perpendicular to the inclined surface. The horizontal component of this normal force pushes the main lock 21 to rotate outwards against the force of the first spring 30, causing the hook 210 to temporarily retract. When the basket 200 has descended to its final position, after the hook 210 has slid past the end of the actuating arm 122, the external driving force disappears, the main lock 21 resets under the action of the first spring 30, and the hook 210 immediately engages the locking part 12, completing the automatic locking. The entire process requires no additional operation, achieving a convenient experience of locking immediately upon placement. This also allows the basket 200 to automatically slide into the locking position under the guidance of the inclined surface when docking with the trolley 100, even if the hook 210 is not completely aligned, thus achieving blind insertion functionality. like Figure 9-12 As shown, the actuating arm 122 has a hollow center. This hollowing slightly reduces the overall rigidity of the actuating arm 122, giving it a certain degree of elastic deformation capability. At the moment the basket 200 descends and locks, if the hook 210 and the actuating arm 122 are too tightly fitted, the actuating arm 122 can produce a slight elastic bend, absorbing some of the impact energy, making the locking process smoother, and reducing impact wear on the parts.

[0045] like Figure 9-12 As shown, the first spring 30 is a tension spring connected to the upper part of the main lock 21 and located on the side away from the lock part 12. Using a tension spring as the first spring 30 and connecting it to the upper part of the main lock 21 on the side away from the lock part 12 ensures that the tension direction of the tension spring is opposite to the unlocking rotation direction of the main lock 21, providing a stable and clear reset torque. Simultaneously, an openable decorative cover can be provided on the upper side of the tension spring; the exposed or semi-exposed design of the tension spring facilitates inspection and replacement.

[0046] The locking mechanism for the basket and trolley, and the trolley system with the basket, provided by this invention have been described above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand this invention and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A locking mechanism for the basket and trolley, used for connecting the bracket and the interface, characterized in that, The bracket is provided with an abutment part and a locking part; the interface is provided with a two-lock assembly, which includes a main lock and a secondary lock; The main lock includes an exposed operating part and a locking hook. The main lock is rotatably mounted on the interface and equipped with a first spring. The lower end of the locking hook is provided with a hook portion. Under the action of the first spring, the hook portion keeps hooked on the corresponding locking part. Operating the main lock can disengage the hook portion from the locking part. The locking hook is provided with a first locking groove and a second locking groove that are spaced apart by a unidirectional ridge, and the first locking groove and the second locking groove are connected by a transition groove. The secondary lock includes a base and an arm with a protrusion at the end; a second spring is disposed on the upper side of the base; When the interface is inserted into the bracket, the abutting part presses against the base, the second spring is compressed, the protrusion is located in the first locking groove, and the hook hooks the corresponding locking part under the action of the first spring. When the operating part is pressed, the main lock rotates, the hook part disengages from the lock part, the protrusion passes over the one-way ridge to the second lock groove and is restricted by the one-way ridge in the opposite direction, and the rotation of the main lock is restricted so that the hook part remains disengaged from the lock part; When the interface disengages from the bracket, the secondary lock is reset by the action of the second spring, and the protrusion returns from the second groove through the transition groove to the position below the first groove.

2. The locking mechanism for the basket and trolley according to claim 1, characterized in that, The base has a waist-shaped hole, and a pin passes through the waist-shaped hole so that the secondary lock can move up and down relative to the main lock.

3. The locking mechanism for the basket and trolley according to claim 1, characterized in that, The unidirectional ridge has a first inclined wall located on the first locking groove side and a first vertical wall located on the second locking groove side.

4. The locking mechanism for the basket and trolley according to claim 3, characterized in that, The protrusion has a second inclined wall that mates with the first inclined wall and a second vertical wall that mates with the first vertical wall.

5. The locking mechanism for the basket and trolley according to claim 1, characterized in that, The locking part is located below the abutting part, and the locking part includes a lateral connecting arm and an action arm that slopes downward toward the hook part.

6. The locking mechanism for the basket and trolley according to claim 1, characterized in that, The hook of the main lock and the arm of the secondary lock are both inclined in a direction away from the lock.

7. The locking mechanism for the basket and trolley according to claim 6, characterized in that, In the initial state and in the locked state of the hook and lock, the extension direction of the unidirectional ridge is inclined relative to the insertion direction of the interface and is opposite to the extension direction of the arm of the secondary lock.

8. The locking mechanism for the basket and trolley according to claim 1, characterized in that, The first spring is a tension spring connected to the upper part of the main lock and located on the side away from the lock part.

9. The locking mechanism for the basket and trolley according to claim 5, characterized in that, The middle of the actuating arm is hollowed out.

10. A trolley system with a basket, characterized in that... The device includes a trolley and a basket. Each side of the trolley has a bracket, and each side of the basket has an interface. The locking mechanism between the basket and the trolley as described in any one of claims 1-9 is located between one or both brackets and interfaces.

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