Ignition switch lock with keyless start with optional unlocking function

Abstract

The present invention relates to a locomotive ignition switch lock, and in particular to an ignition switch lock with keyless start. The technical solution is: an ignition switch lock with keyless start and an alternative unlocking function, comprising a lock body, a knob installed on the lock body, a rotating shaft in the lock body and linked to the knob, and a latch linked to the rotating shaft, an electromagnetic controller is provided on the lock body, a pin shaft that can be retracted after power is turned on, a circumferential limit groove that matches the pin shaft is provided on the rotating shaft, a pusher is provided between the knob and the lock body, and when the electromagnetic controller fails, the pusher can move toward the pin shaft and cause the pin shaft to disengage from the circumferential limit groove to release the circumferential locking of the rotating shaft, and the knob is provided with a password lock component that locks or unlocks the pusher. By adopting the above technical solution, a keyless start ignition switch lock with an alternative unlocking function is provided, which can be unlocked without key drive when a failure occurs, has a simple structure, and is easy to unlock.

Description

Technical Field

[0001] The invention relates to a locomotive ignition switch lock, in particular to an ignition switch lock for keyless starting. Background Art

[0002] The ignition lock of the keyless system is suitable for ignition, shutdown and anti-theft use of motorcycles and electric vehicles. This ignition switch has the same basic functions of "ON, OFF, LOCK" required by the vehicle as traditional similar products. However, the keyless system has defects. When the relay that receives the electronic signal fails, the motorcycle cannot be started, and the key cannot be inserted into the lock cylinder to start it. Therefore, an ignition switch that combines keyless start and key start has appeared.

[0003] In order to overcome the defects of the traditional keyless system ignition lock, after continuous research and development by technicians in this field, ignition locks that can be started without a key or with a key have appeared on the market. For example, the patent number is "ZL2018010129844.4", the application date is: February 8, 2018, and the patent name is "An ignition switch lock that can be started without a key and with a key", and the content published is as follows: An ignition switch lock that can be started without a key and with a key, including a knob, a lock core and a lock body, the lock core is rotatably arranged in the lock body, the knob is linked to the lock core, a rotating shaft is rotatably arranged in the lock body, the rotating shaft can move along the axial direction of the lock core, the rotating shaft is linked to the lock core, and the lock body is provided with a rotor switch at the end position of the rotating shaft away from the lock core. The lock body is also provided with a drive plate and a latch, the drive plate is connected to the latch, and the rotation of the rotating shaft can drive the drive plate to move to realize the telescopic movement of the latch, an electromagnetic controller is provided on the lock body, and a pin shaft is provided on the electromagnetic controller. The electromagnetic controller can control the telescopic movement of the pin shaft, and a blade groove is provided on the lock core.

[0004] A blade matching the key is provided, and a rotatable lock core sleeve is provided on the outer peripheral sleeve of the lock core. The lock core sleeve is provided with a slot or a hole matching the blade. A pin shaft slot is provided on the outer peripheral surface of the lock core sleeve. The pin shaft is disengaged from or inserted into the pin shaft slot to unlock or lock the lock core. When the lock core is not inserted with a key that matches it, the lock core and the lock core sleeve are linked, and the lock core sleeve and the lock core are controlled by an electromagnetic controller. When the pin shaft is disengaged from the pin shaft slot, the rotating knob drives the lock core and the lock core sleeve to rotate, thereby driving the rotating shaft to rotate. When the pin shaft is inserted into the pin shaft slot, the lock core and the lock core sleeve are locked; when the lock core is inserted into a key that matches it, the blade is disengaged from the slot or the hole of the lock core sleeve, and the lock core can rotate in the lock core sleeve. At this time, rotating the key drives the lock core to rotate, thereby driving the rotating shaft to rotate. The principle is as follows: the knob is linked to the lock core so that the knob can drive the lock core to rotate and move along its axial direction; the rotating shaft is linked to the lock core so that the lock core can drive the rotating shaft to rotate and move; a coil and a driving spring are arranged in the electromagnetic controller; when the coil is energized, the force of the driving spring can be overcome to absorb the pin shaft and disengage it from the pin shaft groove; when the coil is de-energized, the pin shaft extends out and is inserted into the pin shaft groove under the action of the driving spring; whether the electromagnetic controller is energized or not can control the unlocking and locking of the lock core sleeve; if the lock core is not inserted with a matching key, the blades in the lock core extending out of the blade groove can be just stuck in the slot or hole of the lock core sleeve, thereby realizing the linkage between the lock core and the lock core sleeve; when the electromagnetic controller works normally, the electromagnetic controller controls the pin shaft to disengage from the pin shaft; The lock core can be rotated in the lock core sleeve, and the rotating key can drive the lock core to rotate, thereby driving the rotating shaft to rotate. The rotation of the rotating shaft can drive the rotor switch for keyless starting. The lock core can also be driven to rotate by turning the knob, and the lock core drives the rotating shaft to rotate. The rotating shaft drives the driving plate to move to realize the telescopic movement of the lock latch and lock the car. When the electromagnetic controller cannot work normally, the electromagnetic controller cannot control the pin shaft to disengage from the pin shaft groove. Since the lock core and the lock core sleeve are linked, they cannot rotate and keyless starting cannot be performed. The lock core is inserted into the key that matches it, and the blade is separated from the slot or hole of the lock core sleeve. The lock core can rotate in the lock core sleeve. At this time, rotating the key drives the lock core to rotate, thereby driving the rotating shaft to rotate. The rotation of the rotating shaft can drive the rotor switch for keyed starting.

[0005] It can be seen from the above patent that the lock cylinder outer sleeve is provided with a lock cylinder sleeve that can lock the lock cylinder. When the electromagnetic controller fails and the pin shaft in the electromagnetic brake cannot unlock the lock cylinder sleeve, the connection between the lock cylinder sleeve and the lock cylinder is released by inserting an appropriate key into the lock cylinder, thereby rotating the lock cylinder, and the lock cylinder linkage shaft controls the latch to unlock the locomotive.

[0006] However, its internal structure is not only complicated, but also inconvenient to assemble and costly. Moreover, when the electromagnetic controller fails, the key must be used to control the lock cylinder. Since operators have been using keyless drive for a long time, they are used to it and do not always carry spare keys. Therefore, when there is no spare unlocking key and the electromagnetic relay fails, the operator still cannot unlock it. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides an ignition switch lock with a keyless start and an alternative unlocking function, which can be unlocked without key actuation when a fault occurs, has a simple structure and is easy to unlock.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a keyless start ignition switch lock with an alternative unlocking function, comprising a lock body, a knob installed on the lock body, a rotating shaft in the lock body and linked with the knob to slide back and forth along the axial direction of the lock body and rotate circumferentially, and a latch linked with the rotating shaft to achieve locking or unlocking, the lock body is provided with an electromagnetic controller, the electromagnetic controller is provided with a pin shaft that can be retracted after power is turned on, and it is characterized in that: the rotating shaft is provided with a circumferential limit groove adapted to the pin shaft, a pushing member is provided between the knob and the lock body, which can move toward the pin shaft and cause the pin shaft to disengage from the circumferential limit groove to release the circumferential locking of the rotating shaft when the electromagnetic controller fails, and the knob is provided with a password lock component for locking or unlocking the pushing member.

[0009] By adopting the above technical solution, the knob is linked with the rotating shaft, and the pin of the electromagnetic controller is directly locked with the rotating shaft, which reduces the number of parts, makes the structure simple, and is easy to assemble; when the electromagnetic controller fails, the pin cannot be withdrawn from the circumferential limit groove of the rotating shaft, that is, the ignition switch cannot be unlocked. At this time, the correct password can be input into the password lock component to release the restriction on the pusher, and then the pusher can be pushed. The pusher can push the pin in the circumferential limit groove out of the circumferential limit groove, so that the electromagnetic controller releases the lock on the rotating shaft. Finally, the knob is rotated, and the knob can drive the rotating shaft to rotate, and the latch linked to the rotating shaft can achieve unlocking and ignition. No external tools are required, and the unlocking process is not only simple and convenient, but also fault unlocking can be performed in real time.

[0010] The present invention is further configured as follows: the knob and the rotating shaft are linked by a connecting disk, the knob is provided with an installation cavity for installing a combination lock assembly, the pushing member includes a locking portion located in the knob installation cavity and lockable with the combination lock assembly, and an unlocking portion extending into the rotating shaft, the top end face of the unlocking portion is an inclined surface, and the pin shaft is provided with an unlocking inclined surface adapted to the inclined surface.

[0011] With the above technical solution, the pusher and the rotating shaft are connected through a connecting plate, which is convenient for assembly and debugging and correction of the lock body gear position. The locking part of the pusher and the pin shaft are in conflict with each other through the inclined surface and the unlocking inclined surface, which not only makes the pusher more labor-saving when pushing the pin shaft, but also prevents the phenomenon of jamming.

[0012] The present invention is further configured as follows: the locking portion of the pusher includes a connecting column passing through the knob and a locking block arranged on the side of the connecting column, the locking block is provided with a locking notch for locking the password lock assembly, the unlocking portion is a columnar body, and one end of it facing the connecting column is provided with a plug-in groove for plugging and connecting the connecting column, a cavity is provided in the rotating shaft for reciprocating sliding of the unlocking portion, a limiting groove is provided on the side wall of the cavity, and an anti-circumferential rotation block adapted to the limiting groove is provided on the outer circumferential surface of the unlocking portion.

[0013] By adopting the above technical scheme, the structural design of the locking part is reasonable, and the installation space of the knob is reasonably utilized, making the structure after assembly more compact. The setting of the upper limit groove on the rotating shaft and the anti-circumferential rotation block of the unlocking part can ensure the stability of the pushing block during the working process and prevent it from circumferentially rotating and deviating from the interference position with the pin shaft.

[0014] The present invention is further configured as follows: a multi-speed limit groove is provided on the outer circumferential surface of the rotating shaft, a positioning pin extending into the multi-speed limit groove is provided on the lock body, an axial movement stroke limit long groove is provided on the outer circumferential surface of the pushing member, and a travel positioning pin extending into the axial movement stroke limit long groove is provided on the rotating shaft.

[0015] With the above technical solution, the setting of multi-position limit slots and positioning pins can ensure that the knob drives the shaft to rotate to the ON, OFF, LOCK and other positions, and the circumferential rotation position of the shaft is positioned to prevent excessive rotation from causing inconsistency with the unlocking or unlocking instructions. The setting of the axial travel limit slot and the travel positioning pin can control the travel of the pusher in the shaft, making the driving process more precise and stable.

[0016] The present invention is further configured as follows: a relay switch capable of identifying an external keyless control system to energize the electromagnetic controller is provided in the lock body, and a paddle capable of touching the relay switch when the paddle moves axially in the lock body is provided on the rotating shaft.

[0017] By adopting the above technical solution, when the knob is pushed, the rotating shaft moves axially in the lock body, and the paddle on the rotating shaft can touch the relay switch. At this time, if the relay switch matches the external keyless control system, the relay switch prompts the electromagnetic controller to be energized, and the pin shaft in the electromagnetic controller will be unlocked.

[0018] The present invention is further configured as follows: the combination lock assembly includes a lock shell, an installation shaft placed in the lock shell, at least two connecting seats sleeved on the installation shaft and rotatable along the installation shaft, combination wheels with numbers fixedly arranged on the connecting seats respectively, and lock tongues arranged corresponding to the connecting seats, each connecting seat is provided with an unlocking notch correspondingly, the lock tongue is a frame body covered outside the combination wheel and can slide back and forth along the installation shaft, and the frame body is provided with a protrusion and a locking protrusion arranged corresponding to the unlocking notch.

[0019] By adopting the above technical solution, the protrusion on the frame corresponds to the unlocking notch on the connecting seat. If the password wheel drives the connecting seat to rotate until the unlocking notch on it does not correspond to the protrusion on the frame, the locking protrusion on the frame and the pushing member remain locked; if the pushing member is pushed after adjustment, the locking protrusion will slide out of the pushing member, and the protrusion on it will enter the unlocking notch of the connecting seat, thereby unlocking the pushing member.

[0020] The present invention is further configured as follows: a positioning protrusion is provided on the side of the connecting seat, and a plurality of positioning installation holes that can be matched with the positioning protrusion are provided on the cipher wheel.

[0021] By adopting the above technical solution, the unlocking password of the password wheel can be changed as needed.

[0022] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the present invention;

[0024] Figure 2 It is a structural schematic diagram of an embodiment of the present invention;

[0025] Figure 3 for Figure 2 An enlarged schematic diagram of part I;

[0026] Figure 4 A three-dimensional schematic diagram of a rotating shaft in an embodiment of the present invention Figure 1 ;

[0027] Figure 5 A three-dimensional schematic diagram of a rotating shaft in an embodiment of the present invention Figure 2 ;

[0028] Figure 6 This is an exploded schematic diagram of a pusher in an embodiment of the present invention;

[0029] Figure 7 Schematic diagram of the exploded view of the combination lock assembly in the embodiment of the present invention. DETAILED DESCRIPTION

[0030] like Figure 1 — Figure 7The ignition switch lock with keyless start and optional unlocking function shown in the figure comprises a lock body 1, a knob 2 mounted on the lock body 1 and rotatable to multiple working positions, a rotating shaft 3 in the lock body 1 and linked with the knob 2 and capable of sliding back and forth along the axial direction of the lock body 1 and rotating in the circumferential direction, and a latch 4 linked with the rotating shaft 3 and capable of locking or unlocking. The rotating shaft 3 and the latch 4 can be linked through a connecting piece or a connecting arm, that is, when the rotating shaft 3 rotates, the latch 4 is prompted to be extended and retracted on the lock body 1 through the linkage member, thereby forming locking or unlocking. An electromagnetic controller 5 is arranged on the lock body 1, and the electromagnetic controller 5 is composed of a housing 51, an electromagnetic coil 52 arranged in the housing 51, and a pin 53 that can reciprocate and retract along the housing 51 after the electromagnetic coil 52 is energized, and a spring 54 is arranged at the pin 53 to resist the axial direction thereof. A relay switch 6 is provided in the lock body 1, which can identify the external keyless control system and cause the electromagnetic controller 5 to be powered on. A paddle 61 is provided on the rotating shaft 3, which can touch the relay switch 6 when the rotating shaft 3 is axially moved in the lock body 1. When the knob 2 is pushed, the rotating shaft 3 is caused to move axially in the lock body 1, and the paddle 61 on the rotating shaft 3 can touch the relay switch 6. At this time, if the relay switch 6 matches the external keyless control system, the relay switch 6 causes the electromagnetic controller 5 to be powered on, and the pin 53 in the electromagnetic controller 5 will be unlocked. A circumferential limit groove 31 adapted to the pin 53 is provided on the rotating shaft 3. A pusher 7 is provided between the knob 2 and the lock body 1, which can move toward the pin 53 and cause the pin 53 to disengage from the circumferential limit groove 31 to release the circumferential locking of the rotating shaft 3 when the electromagnetic controller 5 fails. A password lock assembly 8 is provided on the knob 2 to lock or unlock the pusher 7. In the above scheme, the knob 2 is linked with the rotating shaft 3, and the pin 53 of the electromagnetic controller 5 is directly locked with the rotating shaft 3, which reduces the number of parts, makes the structure simple, and is easy to assemble; when the electromagnetic controller 5 fails, the pin 53 cannot be withdrawn from the circumferential limit groove 31 of the rotating shaft 3, that is, the ignition switch cannot be unlocked. At this time, the correct password can be input into the password lock assembly 8, so that the password lock assembly 8 releases the restriction on the pusher 7, and then the pusher 7 is pushed. The pusher 7 can push the pin 53 in the circumferential limit groove 31 out of the circumferential limit groove 31, so that the electromagnetic controller 5 releases the lock on the rotating shaft 3. Finally, the knob 2 is rotated, and the knob 2 can drive the rotating shaft 3 to rotate, and the latch 4 linked with the rotating shaft 3 can achieve unlocking and ignition. No external tools are required, and the unlocking process is not only simple and convenient, but also fault unlocking can be performed in real time.

[0031] In the embodiment of the present invention, the knob 2 is linked to the shaft 3 through the connecting plate 9. The knob 2 is provided with an installation cavity 21 for installing the password lock assembly 8. The installation cavity 21 is provided with a dustproof sealing plate 22 hinged to the knob 2. When the password assembly 8 needs to be operated, the dustproof sealing plate 22 can be opened. Otherwise, it is buckled with the knob 2 to prevent external impurities from entering the password lock assembly 8. The pusher 7 includes a locking portion 71 in the installation cavity 21 of the knob 2 that can be locked with the password lock assembly 8 and an unlocking portion 72 extending into the shaft 3. The top end surface of the unlocking portion 72 is a slope 721, and the pin 53 is provided with an unlocking slope 531 adapted to the slope 721. The pusher 7 is connected to the shaft 3 through the connecting plate 9, which is convenient for assembly and debugging and correction of the gear position of the lock body 1. The unlocking portion 72 of the pushing member 7 and the pin shaft 53 are in conflict with each other through the inclined surface 721 and the unlocking inclined surface 531 , which not only makes it easier for the pushing member 7 to push the pin shaft 53 , but also prevents the pushing member 7 from getting stuck.

[0032] In the embodiment of the present invention, the locking portion 71 of the pusher 7 includes a connecting column that passes through the knob and a locking block arranged on the side of the connecting column, the locking block is provided with a locking notch 711 for the password lock assembly 8 to lock, the unlocking portion 72 is a columnar body, and one end thereof facing the connecting column is provided with a plug-in groove 721 for the connecting column to be plugged in and connected, a cavity 32 for the reciprocating sliding of the unlocking portion 72 is provided in the rotating shaft 3, a limiting groove 321 is provided on the side wall of the cavity 32, and an anti-circumferential rotation block 722 adapted to the limiting groove 321 is provided on the outer peripheral surface of the unlocking portion 72. It should be noted that the locking portion 71 and the unlocking portion 72 of the pusher 7 can be arranged as an integral unit, and the pusher 7 can also be directly arranged as an integral unit with the knob 2, which are both feasible. However, in order to facilitate debugging during assembly, the present invention preferably sets them separately. The locking portion 71 has a reasonable structural design and makes rational use of the installation space of the knob 2, making the assembled structure more compact. The setting of the upper limit groove 321 on the rotating shaft 3 and the anti-circumferential rotation block 722 of the unlocking portion 72 can ensure the stability of the pusher 7 during operation and prevent it from circumferentially rotating and deviating from the interference position with the pin 53.

[0033] In the embodiment of the present invention, a multi-position limit groove 33 is provided on the outer circumference of the rotating shaft 3, a positioning pin 11 extending into the multi-position limit groove 33 is provided on the lock body 1, an axial movement stroke limit long groove 723 is provided on the outer circumference of the unlocking portion 72 of the pusher 7, and a travel positioning pin 34 extending into the axial movement stroke limit long groove 723 is provided on the rotating shaft 3. The provision of the multi-position limit groove 34 and the positioning pin 11 can ensure that the knob 2 drives the rotating shaft 3 to rotate to positions such as ON, OFF, and LOCK, and the circumferential rotation position of the rotating shaft 3 is positioned to prevent excessive rotation from causing inconsistency with the unlocking or unlocking instructions. The provision of the axial movement stroke limit long groove 723 and the travel positioning pin 34 can control the movement stroke of the pusher 7 in the rotating shaft 3, making the driving process more accurate and stable.

[0034] The combination lock assembly 8 in the embodiment of the present invention includes a lock shell 81, an installation shaft 82 placed in the lock shell 81, at least two connecting seats 83 sleeved on the installation shaft 82 and rotatable along the installation shaft 82, combination wheels 84 with numbers fixedly arranged on the connecting seats 83, and lock tongues 85 corresponding to the connecting seats 83. Each connection seat 83 is respectively provided with an unlocking notch 831. The lock tongue 85 is a frame body covered outside the combination wheel 84 and can slide back and forth along the installation shaft 82. The frame body is provided with a protrusion 851 and a locking protrusion 852 corresponding to the unlocking notch 831. The protrusion 851 on the frame corresponds to the unlocking notch 831 on the connecting seat 83. If the password wheel 84 drives the connecting seat 83 to rotate until the unlocking notch 831 thereon does not correspond to the protrusion 851 on the frame, the locking protrusion 852 on the frame remains locked with the pusher 7; if the pusher 7 is pushed after the adjustment, the locking protrusion 852 will slide out of the pusher 7, and the protrusion 851 thereon will enter the unlocking notch 831 of the connecting seat 83, so as to unlock the pusher 7. Of course, it should be noted that the password lock assembly 8 can also be electronic, that is, the password is input through the touch screen, and the locking structure inside it is used to implement the locking or unlocking of the pusher 7, which is also feasible.

[0035] In order to facilitate the replacement of the code on the code wheel 84 , a positioning protrusion 832 is provided on the side of the connecting seat 83 , and a plurality of positioning mounting holes 841 that can be matched with the positioning protrusion 832 are provided on the code wheel 84 .

Claims

1. A keyless start ignition switch lock with an alternative unlocking function, comprising a lock body, a knob mounted on the lock body, a rotating shaft in the lock body that can slide back and forth along the axial direction of the lock body and rotate circumferentially in linkage with the knob, and a latch that can be locked or unlocked in linkage with the rotating shaft, wherein the lock body is provided with an electromagnetic controller, and the electromagnetic controller is provided with a pin that can be retracted after power is supplied, and the characteristics are as follows: The rotating shaft is provided with a circumferential limit groove adapted to the pin shaft, a pusher is provided between the knob and the lock body, which can move toward the pin shaft and cause the pin shaft to disengage from the circumferential limit groove to release the circumferential locking of the rotating shaft when the electromagnetic controller fails, the knob is provided with a password lock component for locking or unlocking the pusher, the knob is provided with an installation cavity for installing the password lock component, the pusher includes a locking portion located in the knob installation cavity and lockable with the password lock component and an unlocking portion extending into the rotating shaft, the locking portion of the pusher includes a connecting column passing through the knob and a locking block provided on the side of the connecting column, the locking block A locking notch is provided on the top for locking the password lock assembly, the unlocking part is a columnar body, and a plug-in groove is provided on one end of the column facing the connecting column for plugging and connecting the connecting column. The password lock assembly includes a lock shell, a mounting shaft placed in the lock shell, at least two connecting seats sleeved on the mounting shaft and rotatable along the mounting shaft, password wheels with numbers fixed to the connecting seats respectively, and lock tongues corresponding to the connecting seats, and each connecting seat is provided with an unlocking notch corresponding to the unlocking notch. The lock tongue is a frame body covered outside the password wheel and can slide back and forth along the mounting shaft, and the frame body is provided with a protrusion and a locking protrusion corresponding to the unlocking notch.

2. The keyless start ignition switch lock with alternative unlocking function according to claim 1, characterized in that: The knob and the rotating shaft are linked to each other via a connecting disk. The top end surface of the unlocking portion is an inclined surface, and the pin shaft is provided with an unlocking inclined surface matched with the inclined surface.

3. The keyless start ignition switch lock with alternative unlocking function according to claim 2, characterized in that: A cavity is provided in the rotating shaft for the unlocking part to slide back and forth, a limiting groove is provided on the side wall of the cavity, and an anti-circumferential rotation block matched with the limiting groove is provided on the outer peripheral surface of the unlocking part.

4. The keyless start ignition switch lock with alternative unlocking function according to claim 2 or 3, characterized in that: The outer circumference of the rotating shaft is provided with a multi-speed limit groove, the lock body is provided with a positioning pin extending into the multi-speed limit groove, the outer circumference of the pushing member is provided with an axial movement stroke limit long groove, and the rotating shaft is provided with a travel positioning pin extending into the axial movement stroke limit long groove.

5. The keyless start ignition switch lock with alternative unlocking function according to claim 1, 2 or 3, characterized in that: The lock body is provided with a relay switch which can identify an external keyless control system and energize the electromagnetic controller, and the rotating shaft is provided with a paddle which can touch the relay switch when the lock body moves axially.

6. The keyless start ignition switch lock with alternative unlocking function according to claim 1, characterized in that: A positioning protrusion is provided on the side of the connecting seat, and a plurality of positioning installation holes which can be matched with the positioning protrusion are provided on the cipher wheel.

7. The keyless start ignition switch lock with alternative unlocking function according to claim 5, characterized in that: The combination lock assembly includes a lock shell, an installation shaft placed in the lock shell, at least two connecting seats sleeved on the installation shaft and rotatable along the installation shaft, combination wheels with numbers fixedly arranged on the connecting seats, and lock tongues arranged corresponding to the connecting seats. Each connecting seat is provided with an unlocking notch corresponding to each other. The lock tongue is a frame body covered outside the combination wheel and can slide back and forth along the installation shaft. The frame body is provided with a protrusion and a locking protrusion arranged corresponding to the unlocking notch.

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