WO2021000525A1

WO2021000525A1 - Stackable storage system

Info

Publication number: WO2021000525A1
Application number: PCT/CN2019/125120
Authority: WO
Inventors: Yin Xu; Yan Wu; Changliang HU; Jun Zhang
Original assignee: Jiangsu Sainty Sumex Tools Corp., Ltd.
Priority date: 2019-07-04
Filing date: 2019-12-13
Publication date: 2021-01-07
Also published as: CN110254902A

Abstract

A stackable storage system and a lock bolt mechanism thereof are disclosed. The stackable storage system (100) includes a base container assembly (102) and a modular container assembly (104). Covers (302) are arranged at openings of the assemblies. Each cover is provided with at least one row of recesses (408) extending from back to front, and a groove (406) is formed in the rear side wall of each recess. Protruding connection pins corresponding to the recesses are arranged at the bottom surface of the modular container assembly and are matched with the grooves in shape. Each cover is provided with a first groove (502), and a sliding groove (702) corresponding to the first groove is formed in the lower part of the front wall of the modular container assembly and extends downwards to the bottom surface of the modular container assembly. A lock bolt (604) is able to slide upwards and downwards along the sliding groove. The stackable storage system will not fall down or come apart when moved and is easy to assemble and disassemble.

Description

STACKABLE STORAGE SYSTEM

FIELD

The present disclosure relates generally to container assemblies, and more particularly to stackable storage systems and lock bolt mechanisms therefor.

BACKGROUND

Container assemblies are generally used for holding or storing different objects and this term can refer to a variety of storage assemblies having any shape or size, such as storage containers, suitcases, toolboxes, storage boxes, and the like. Some container assemblies can be stacked together to reduce the space occupied and to provide more compact storage. Existing stackable container assemblies typically have the following structure: recesses, protrusions, or clamping structures arranged on certain points on the tops of the container assemblies or their covers, and corresponding protrusions, recesses, or clamping slots, respectively, arranged at the corresponding positions of the bottoms of the container assemblies. With this type of structure, many container assemblies can be stacked together.

There are some drawbacks with existing stackable container assemblies. For one, some stacked container assemblies do not readily withstand vibrations or shaking and can become dislodged or otherwise come apart after being stacked. Thus, some existing stackable container assemblies are not stable in structure after being stacked, thereby being unsuitable for a stackable storage system needing to be moved frequently, and particularly being inconvenient to transport or carry.

Improvements in stackable storage systems and alternatives to these systems are desirable. For example, there is a need for the design and development of a stackable storage system that is stable and secure, reliable, convenient and rapid to disassemble and assemble, and that can withstand vibrations and wobbles in daily use, and is convenient to carry and use, even under a heavy load.

The foregoing examples of the related art and limitations related thereto are intended to be illustrative and not exclusive. Other limitations of the related art will become apparent to those of skill in the art upon a reading of the specification and a review of the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Examples are illustrated with reference to the attached drawings. It is intended that the examples and figures disclosed herein be considered illustrative rather than restrictive.

Fig. 1 is a front perspective view of a stackable storage system, in accordance with an example.

Fig. 2 is a rear perspective view of the stackable storage system of Fig. 1.

Fig. 3 is a sectional view of two modular container assemblies stacked together, taken along line 3 shown in Fig. 1., in accordance with an example.

Fig. 4 is an enlarged view of a portion of the stackable storage system shown in Fig. 3.

Fig. 5 is a top perspective view of a cover, in accordance with an example.

Fig. 6 is a perspective view, fragmented, of a container assembly with a lock bolt and magnet pairs, in accordance with an example.

Fig. 7 is a sectional view of two modular container assemblies stacked together illustrating the lock bolts of the two modular container assemblies, in accordance with an example;

Fig. 8 is a perspective view of two modular container assemblies configured to be installed together, and the modular container assembly above is about half the size of the modular container assembly below, in accordance with an example.

Fig. 9 is a perspective view of the two modular container assemblies of Fig. 8 stacked together.

Fig. 10 is a side elevation view of a stackable storage system with a pull rod laid down horizontally, in accordance with an example.

Fig. 11 is a side elevation view of a modular container assembly including a cover clamping structure, in accordance with an example.

Fig. 12 is an enlarged view of a portion of the modular container assembly shown in Fig. 11.

Fig. 13 is a rear perspective view of a lock bolt and a rotary knob, in accordance with an example.

Fig. 14 is a front perspective view of the lock bolt and the rotary knob of Fig. 13 with a latch body, in accordance with an example.

Fig. 15 is a perspective view of an interior of a modular container assembly, in accordance with an example.

Fig. 16A and Fig. 16B are perspective views of a rotary knob and a lock bolt in a first working state and a second working state, for locking and unlocking the modular container assemblies, respectively, in accordance with an example.

Reference Numbers: stackable storage system 100; base container assembly 102; modular container assembly 104-1, 104-2, …104-n (individually or collectively 104) ; rolling wheel 106; pull rod 108; rotary knob 110; threaded hole 112; handle 202; sleeve 204; support leg 206; cover 302; connection pin 304; connection block 402; connector 404; groove 406; recess 408; first groove 502; second groove 504; bottom surface of sliding groove 602; lock bolt 604; first magnets 606; screw 608; eccentric groove 610; sliding groove 702, support leg 802; lifting handle 1002; oblique surface 1004; articulated shaft 1202; protrusion 1204; lug boss 1206; bottom surface of lock bolt 1302, lock bolt hinge pin 1304; latch body 1402, second magnets 1404, screw hole 1406, lip 1408, interior 1502, latch body housing 1504.

DETAILED DESCRIPTION

The following describes a stackable storage system that includes a base container assembly and a modular container assembly stacked on the base container assembly, wherein the base container assembly and the modular container assembly are provided with openings facing upwards, wherein pull rods are arranged on a rear wall of the base container assembly, rolling wheels are arranged at the bottom of the base container assembly, and wherein covers are arranged at the openings of the base container assembly and the modular container assembly.

In one example, each cover is provided with at least one row of recesses extending from back to front, and a groove is formed in the rear side wall of each recess; protruding connection pins corresponding to the recesses are arranged at the bottom surface of the modular container assembly and include connection blocks fixed to the bottom surface of the modular container assembly, as well as connectors arranged on the connection blocks and extending towards the pull rods; and the connectors are matched with the grooves in shape.

According to this example, each cover is provided with a first groove, a sliding groove corresponding to the first groove is formed in the lower part of the front wall of the modular container assembly and extends downwards to the bottom surface of the modular container assembly, and a lock bolt which is able to slide upwards and downwards along the sliding groove is arranged in the sliding groove; and the lock bolt has a first working state and a second working state, wherein in the first working state, the lock bolt is inserted into the first groove of the corresponding cover, and in the second working state, the lock bolt is located above the corresponding cover. In the first working state, the lock bolt is located between the bottom surface of the sliding groove and the front wall of the first groove and is limited by the bottom surface of the sliding groove and the front wall of the first groove.

In one example, when the stackable storage system is used in a stacked manner, the connection pins of the modular container assembly are inserted into the grooves in the cover which is adjacent to the modular container assembly and is located under the modular container assembly, so that the modular container assembly is limited in the left direction, the right direction and the rear direction, and then the modular container assembly is limited in the front direction by the lock bolt inserted into the first groove in the cover under the modular container assembly so as to be firmly fixed to the base container assembly, and the stackable storage system is convenient and rapid to disassemble and assemble, and is firm and reliable. Compared with existing stackable container assemblies, the stackable storage system can withstand vibrations and wobbles in daily use and is convenient to carry and use.

According to one example, the number of the modular container assemblies is not limited to only one, and a plurality of the modular container assemblies can be stacked together for space efficiency. That is to say, in one example, at least two modular container assemblies are stacked on the base container assembly, and in every two adjacent modular container assemblies, the bottom surface and the lock bolt of the modular container assembly above are matched with the cover of the modular container assembly below to form a detachable fixed-connection structure. In this way, each modular container assembly can be detachably attached and connected to the top of another modular container assembly or the top of the base container assembly.

The lock bolts can be driven in various ways. For instance, compression springs can be arranged between the upper walls of the sliding grooves and the lock bolts, and lock bolts inserted into the first grooves in a natural state (namely the first working state) to limit the modular container assemblies; and the lock bolts are provided with handles or hand holes and are driven by hand via the handles or the hand holes to slide upwards so as to be switched to the second working state, and at this moment, the modular container assemblies can be dragged forwards to be disassembled from the covers which are connected with the modular container assemblies and are located under the modular container assemblies. Of course, lock bolt driving mechanisms or lock bolt driving devices in other forms can also be adopted. For instance, one improvement is as follows: first magnets are arranged on the upper wall of the sliding groove, and second magnets acting upon (e.g., repelling) the first magnets are arranged at the top of the lock bolt, and the lock bolt is kept in the first working state under the action of the first magnets and the second magnets; a rotary knobs is arranged in the sliding groove, a hinge pin is fixedly connected to the rotary knob and inserted into an eccentric groove formed in the lock bolt, and the rotary knob rotates to drive the hinge pin to slide along the eccentric groove so as to drive the lock bolt to slide upwards and to be switched to the second working state from the first working state.

Advantageously, examples of the present disclosure provide a portable stackable storage system that will not fall down or come apart as readily when moved, vibrated or wobbled and is easy to assemble and disassemble. The reliability of the structure increases the load that can be carried when compared with existing systems.

It should be noted that the orientation or positional relationship indicated by the terms “above” , “lower” , and the like is based on the orientation or positional relationship shown in the drawings. It is merely for the convenience of describing examples of the present specification and simplifying the description, rather than indicating or implying that the designated device or element must have a particular orientation, configuration and operation in a particular orientation, and therefore should not be construed as limiting the present specification.

As shown in Fig. 1 to Fig. 7, a stackable storage system 100 according to one example includes a base container assembly 102 and one or more modular container assemblies 104 stacked on the base container assembly 102. For instance, as shown in Fig. 1, a modular container assembly 104-1 is stacked on top of another modular container assembly 104-2 and, in turn, modular container assembly 104-2 is stacked on top of the base container assembly 102, as shown in Fig. 1 and Fig. 2. The base container assembly 102 and the modular container assemblies 104 can be storage containers, suitcases, toolboxes, storage boxes, and the like.

According to this example, the base container assembly 102 and the modular container assemblies 104 are provided with openings facing upwards. Pull rods 108 are arranged on the rear wall of the base container assembly 102, rolling wheels 106 are arranged at the bottom of the base container assembly 102, and covers 302 are arranged at the openings of the base container assembly 102 and the modular container assemblies 104. A lower portion of the base container 102 can be molded to provide wheel wells for the rolling wheels 106. The space between the wheel well and the rolling wheels 106 can be sized to provide a snug fit that prevents pebbles or rocks from jamming the rolling wheels 106. The cover 302 can be provided with a gasket or other seal preventing moisture from intruding through the opening and into the interior of the container assembly.

As shown in Fig. 3 and Fig. 4, each cover 302 is provided with at least one row of recesses 408 extending from back to front. As shown in Fig. 6, in one example, each cover 302 is provided with a right row of recesses 408 and a left row of recesses 408, and each row of recesses 408 includes three recesses 408. The recesses 408 are formed with grooves 406 which, in one example, are positioned to at the rear side walls; protruding connection pins 304 corresponding to the recesses 408 are arranged at the bottom surface of the modular container assembly 104 and include connection blocks 402 fixed to the bottom surface of the modular container assembly 104, as well as connectors 404 arranged on the connection blocks 402 and extending towards the pull rods 108; and the connectors 404 are matched with the grooves 406 in shape, that is to say, one side of each connection pin 304 is closed, while the other three sides of each connection pin 304 are open.

As shown in Fig. 5, Fig. 6 and Fig. 7, each cover 302 is provided with a first groove 502. A sliding groove 702 corresponding to the first groove 502 is formed in the lower part of the front wall of the modular container assembly 104 (the interior 1502 of the modular container assembly 104 is shown in Fig. 15) and extends downwards to the bottom surface of the modular container assembly 104. The sliding groove 702 can be contained in a housing 1504. A lock bolt 604 which is configured to slide upwards and downwards along the sliding groove 702 is arranged in the sliding groove 702. The lock bolt 604 can be a U-shaped locking member in one example. The lock bolt 604 can be moved from a first (e.g., locked) working state to a second (e.g., unlocked) working state, wherein in the first working state, the lock bolt 604 is inserted into the first grooves 502 of the corresponding cover 302 (at this position, the lock bolt 604 is located between the bottom surface of the sliding groove 702 and the front wall of the first groove 502 in the cover 302 adjacent to the lock bolt 604 and is limited by the bottom surface 602 of the sliding groove 702 and the front wall of the first groove 502, that is to say, the front wall of the first groove 502 in the cover 302 adjacent to the lock bolt 604 is clamped on the bottom surface 602 of the sliding groove 702 through the lock bolt 604) ; and in the second working state, the lock bolt 604 is located above the corresponding cover 302 (at this position, the lock bolt 604 is separated from the front wall of the first groove 502 in the cover 302 adjacent the lock bolt 604 and no longer limit the corresponding modular container assembly 104) . In this example, the lock bolt 604 can be driven to slide upwards and downwards along the sliding grooves 702 in various ways. It will be appreciated that, and as shown in Fig. 16A, in the first working state, the lock bolt 604 is positioned to act as a clamp to lock or install the stacked modular container assemblies 104 together; as shown in Fig. 16B, upon rotation “A” of the rotary knob 110, in the second working state, the lock bolt 604 including the bottom surface 1302 undergoes movement “B” and is positioned to permit the modular container assemblies 104 to be uninstalled or unlocked or unclamped.

In one example, compression springs are arranged between the upper walls of the sliding groove 702 and the lock bolt 604, so that the lock bolt 604 is inserted into the first groove 502 in a natural state (namely the first working state) to limit the modular container assembly 104; and the lock bolt 604 is provided with handles or finger holes and can be driven by hand via the handles or the finger holes to slide upwards so as to be in the second working state, and in this position, the modular container assembly 104 can be pulled forwards to be disassembled from the cover 302 which is located under the modular container assembly 104 and connected with the modular container assembly 104. Of course, lock bolt driving mechanisms or lock bolt driving devices in other forms can also be adopted.

An exemplary lock bolt driving device is shown in Fig. 6 and Fig. 7 as well as Fig. 13 and Fig. 14. According to this example, first magnets 606 are arranged on the upper wall of the sliding groove 702, second magnets 1404 (not shown in Fig. 6 or Fig. 7) repelling the first magnets 606 are arranged at the top of the lock bolt 604, and the lock bolt 604 is in the first working state under the action of the first magnets 606 and the second magnets 1404. As shown in Fig. 7 and Fig. 13, rotary knobs 110 are arranged in the sliding grooves 702 through screws 608 (that are received in screw holes 1406) . The lock bolt hinge pins 1304 are fixedly connected to the rotary knobs 110 and are inserted into eccentric grooves 610 formed in the lock bolts 604, and the rotary knobs 110 rotate to drive the lock bolt hinge pins 1304 to slide along the eccentric grooves 610 so as to drive the lock bolts 604 to slide upwards to be switched to the second working state from the first working state, so that assembly and disassembly are facilitated. The sliding groove 702 contained in latch housing 1402 may be fitted with a lip 1408 to limit or control the movement of the lock bolt hinge pin 1304. In an alternative example, first magnets 606 and second magnets 1404 could be arranged to be attracting, rather than repelling, to keep the lock bolt 604 in the first working state. Use of magnets as the lock driving mechanism offers benefits in comparison to the use of a metal spring mechanism that can become corroded or fatigued through use or exposure to the elements or that does not work consistently with fluctuations in temperature. Further, magnets provide a varying tension as the distance between the first magnets 606 and the second magnets 1404 changes giving good affordance to the user when locking and unlocking a container assembly. Other advantages will be apparent to those of ordinary skill in the art.

Fig. 7 is a view of two modular container assemblies 104 stacked together. When the modular container assemblies 104 are stacked on the base container assembly 102, the lock bolts 604 are driven to slide upwards and downwards along the sliding grooves 702 in the same way. When the number of the modular container assemblies 104 is two or more, the modular container assemblies 104 are sequentially stacked from bottom to top, that is to say, in every two adjacent modular container assemblies 104, the bottom surface and lock bolt 604 of the modular container assembly 104 above are matched with the cover 302 of the modular container assembly 104 below to form a detachable fixed-connection structure.

When the stackable storage system 100 is used in a stacked manner, the connection pins 304 of the modular container assembly 104-1 are inserted into the grooves in the cover 302 under the modular container assembly 104-2, so that the modular container assembly 104-1 is limited in the left direction, the right direction and the rear direction; and then the modular container assembly 104-1 is limited in the front direction by the lock bolts 604 inserted into the first grooves 502 in the cover 302 under the modular container assembly 104-2. Similar connections firmly fix the modular container assembly 104-2 to the base container assembly 102. The stackable storage system 100 is convenient and rapid to disassemble and assemble, and is firm and reliable. Compared with the existing stackable container assemblies, the stackable storage system 100 according to examples of the present specification can withstand common vibrations and wobbles in daily use, and is convenient to carry and use.

These examples can also be modified including as follows:

(1) The recess 408, away from the pull rods, in each row of recesses 408 formed in each cover 302 is also used as a first groove 502. In this example, two rows of recesses 408 are configured, wherein the two front recesses 408 marked by the reference sign in FIG. 8 are used as first grooves 502, so that three first grooves 502 are formed in each cover 302 to fulfill the following effects: a plurality of lock bolts 604 (not shown in Fig. 8) can be arranged on the modular container assemblies 104 stacked on the covers to limit the modular container assemblies 104, so that connection reliability is improved; and the size of each modular container assembly 104 stacked on the corresponding cover 302 can be set as required to be, in one example, equal to or less than half that of the first or modular container assembly corresponding to the cover 302. In other examples, the modular container assembly 104 can be any size less than the width of the corresponding cover 302. As shown in Fig. 8 and Fig. 9, the size of the modular container assembly above is about half that of the modular container assembly below.

To further improve the connection reliability during stacking, as shown in Fig. 8, second grooves 504 (in Fig. 8, the second grooves 504 include two long grooves and four short grooves which are symmetrically distributed left and right) extending forwards and backwards are formed in the each cover 302, and at least one support leg 802 matched with the second grooves 504 is arranged on the bottom surface of each modular container assembly 104.

(2) As shown in Fig. 2 and Fig. 7, support legs 206 extending backwards are arranged on the rear walls of the modular container assemblies 2, so that each modular container assembly 104 can be placed flat with the back surface facing downwards.

(3) As shown in Fig. 1, Fig. 2, and Fig. 10, a lifting handle 1002 is arranged at the tops of the pull rods 108, forms a step with respect to the pull rods 108, and is flush with the outer sides of the sliding wheels 106, so that the storage system in the stacked state can be kept horizontal after being laid down.

(4) As shown in Fig. 10, in order to conveniently place the storage system in the stacked state in a carriage (such as the carriage of a pickup truck) , the lifting handle 1002 on the pull rods 108 is placed on the carriage first when the storage system is placed on the carriage, then the storage system is pushed into the carriage, and in this example, the top of the lifting handle 1002 is chamfered to form an oblique surface 1004 which inclines from front to back, so that the storage system can surmount small obstacles and can be prevented from being clamped in a groove pre-formed in the bottom of the carriage when pushed. In order to prevent the storage system from being clamped in the groove pre-formed in the bottom of the carriage, the width of the lifting handle 1002 is set to be greater than that of the groove in the bottom of the carriage, and the length of the pull rod is also made greater than the width of the groove in the carriage when the pull rod is laid down on the carriage, so that the storage system will fall into the groove. As shown in Fig. 2 and Fig. 10, in order to protect the pull rod 108 against damage when the storage system is pulled into the carriage, sleeves 204 are disposed around the pull rods 108, and the storage system can be more easily pulled onto the truck through the sleeves 204.

(5) As shown in Fig. 11 and Fig. 12, each cover 302 is articulated with the corresponding base container assembly 102 or modular container assembly 104 and is provided with a protrusion 1204 close to an articulated part, and the corresponding base container assembly 102 or modular container assembly 104 is provided with a lug boss 1206 matched with the protrusion 1204 and located at the articulated part, and when the covers 302 drive the protrusion 1204 to rotate to the lug boss 1206, the protrusion 1204 and the lug boss 1206 are in interference fit to form a cover clamping structure. In this way, when closed, the covers encounter a resistance when in position, to avoid or reduce the occurrence of a cover 302 falling off suddenly and causing injury to the hands of the user.

(6) As shown in Fig. 1, Fig. 2, and Fig. 6, threaded holes 112 are formed in the side surfaces of the base container assembly 102 and/or the modular container assemblies 104. During manufacturing, nuts are embedded into the side surfaces of the base container assembly 102 and/or the modular container assemblies 104, and inner holes of the nuts are used as the threaded holes 112. The number of the threaded holes 112 can be adjusted, and the threaded holes 112 are used for fixing kits or other tools or objects with screws or bolts.

The present disclosure is not limited to the specific technical solutions of the above examples, and can also be implemented in other ways. Technical solutions obtained on the basis of any modifications, equivalent substitutes, and improvements achieved by those skilled in this field also fall within the scope of the disclosure.

Claims

A stackable storage system, comprising a base container assembly and a modular container assembly stacked on the base container assembly, wherein the base container assembly and the modular container assembly are provided with openings facing upwards, wherein pull rods are arranged on a rear wall of the base container assembly, wherein rolling wheels are arranged at a bottom of the base container assembly, and wherein covers are arranged at the openings of the base container assembly and the modular container assembly;

each said cover is provided with at least one row of recesses extending from back to front, and a groove is formed in a rear side wall of each said recess; and protruding connection pins corresponding to the recesses are arranged at a bottom surface of the modular container assembly and include connection blocks fixed to the bottom surface of the modular container assembly, as well as connectors arranged on the connection blocks and extending towards the pull rods; and the connectors are matched with the grooves in shape;

each said cover is provided with a first groove, and a sliding groove corresponding to the first groove is formed in a lower part of a front wall of the modular container assembly and extends downwards to the bottom surface of the modular container assembly, and a lock bolt that is configured to slide upwards and downwards along the sliding groove is arranged in the sliding groove; and the lock bolt has a first working state and a second working state, wherein in the first working state, the lock bolt is inserted into the first groove of the corresponding cover, and in the second working state, the lock bolt is located above the corresponding cover.
The stackable storage system according to Claim 1, wherein at least two said modular container assemblies are stacked on the base container assembly; and wherein in every two adjacent said modular container assemblies, the bottom surface and the lock bolt of the modular container assembly above are matched with the cover of the modular container assembly below to form a detachable fixed-connection structure.
The stackable storage system according to one of Claim 1 and 2, wherein first magnets are arranged on upper walls of the sliding grooves, second magnets acting upon the first magnets are arranged at tops of the lock bolts, rotary knobs are arranged in the sliding grooves, hinge pins are fixedly connected to the rotary knobs and are inserted into eccentric grooves formed in the lock bolts, and the rotary knobs rotate to drive the hinge pins to slide along the eccentric grooves so as to drive the lock bolts to be switched to the second working state from the first working state.
The stackable storage system according to one of Claim 1 and 2, wherein second grooves extending forwards and backwards are formed in the covers, and at least one support leg matched with the second grooves is arranged on the bottom surface of the modular container assembly.
The stackable storage system according to one of Claim 1 and 2, wherein standing legs extending backwards are arranged on a rear wall of the modular container assembly.
The stackable storage system according to one of Claim 1 and 2, wherein a lifting handle is arranged at a top of the pull rods, forms a step with respect to the pull rods, and is flush with outer sides of the sliding wheels.
The stackable storage system according to one of Claim 1 and 2, wherein each said cover is articulated with the corresponding base container assembly or modular container assembly and is provided with a protrusion close to an articulated part, and the corresponding base container assembly or modular container assembly is provided with a lug boss matched with the protrusion and located at the articulated part; and when the cover drives the protrusion to rotate to the lug boss, the protrusion and the lug boss are in interference fit to form a cover clamping structure.
The stackable storage system according to one of Claim 1 and 2, wherein the recess, away from the pull rods, in each said row of recesses, is used as a first groove.
The stackable storage system according to one of Claim 1 and 2, wherein sleeves are disposed around the pull rods.
The stackable storage system according to one of Claim 1 and 2, wherein threaded holes are formed in side surfaces of the base container assembly and the modular container assembly.
A lock bolt driving mechanism comprising:

a lock bolt configured to slide upwards and downwards along a sliding groove formed in a first container assembly, the lock bolt having a first working state and a second working state, wherein in the first working state, the lock bolt is inserted into a first groove of a top surface of a second container assembly, and in the second working state, the lock bolt is removed from the first groove;

first magnets arranged on upper walls of the sliding groove,

second magnets repellingacting upon the first magnets arranged at the top of the lock bolt,

a rotary knob arranged in the sliding groove,

a hinge pin fixedly connected to the rotary knob and inserted into an eccentric groove formed in the lock bolt,

wherein the rotary knob rotates to drive the hinge pin to slide along the eccentric groove so as to drive the lock bolt to be switched to the second working state from the first working state.