CN209891841U

CN209891841U - Lock catch locking mechanism, lock, bus driver seat surrounding door and bus

Info

Publication number: CN209891841U
Application number: CN201920087528.5U
Authority: CN
Inventors: 陆波平
Original assignee: Jiangsu Aerospace Vehicle Accessories Co Ltd
Current assignee: Jiangsu Aerospace Vehicle Accessories Co Ltd
Priority date: 2019-01-19
Filing date: 2019-01-19
Publication date: 2020-01-03
Anticipated expiration: 2029-01-19

Abstract

The utility model discloses a lock catch locking mechanism, a lock, a bus driver seat surrounding door and a bus, which comprises a pawl and a ratchet wheel which are suitable for being meshed and gripped, and a control linkage plate which is connected with the ratchet wheel so that the ratchet wheel is suitable for being disengaged relative to the pawl; the ratchet wheel is connected with a locking device fixing cover through a ratchet wheel torsional spring and is also connected with a locking device bottom plate through a ratchet wheel riveting pipe; the ratchet wheel is suitable for rotating around the ratchet wheel riveting pipe; the pawl is connected with the lock fixing cover through a pawl torsion spring and is also connected with the lock bottom plate through a pawl riveting pipe; and the pawl is adapted to rotate about the pawl rivet tube. The control linkage plate penetrates through the lock bottom plate from one side of the lock bottom plate, which is far away from the ratchet wheel, and then is abutted to the ratchet wheel so as to be suitable for releasing the engagement of the ratchet wheel and the pawl when the ratchet wheel is stirred by the control linkage plate.

Description

Lock catch locking mechanism, lock, bus driver seat surrounding door and bus

Technical Field

The utility model relates to an auto-parts technical field especially relates to a hasp locking mechanism, tool to lock, bus driver's seat surround door and bus.

Background

The stability and the safety of a bus driver in the driving process, which are exposed in the event of a bus falling into a river in the near future, are directly related to the safety of lives and properties of all people on the bus, and not only buses, but also public transportation facilities such as buses and the like have to pay attention to the safety problem of the driver in the driving process, so that the arrangement of equipment capable of preventing the driver from being interfered by passengers in the driving process on the bus is particularly important for improving the overall safety of the bus in the driving process.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a hasp locking mechanism to solve the shock resistance technical problem who improves under the hasp locking state.

The utility model discloses a second purpose provides a bus driver's seat encloses tool to lock for door to the stability technical problem under the hasp locking state that the solution improves the tool to lock.

The third purpose of the utility model is to provide a bus driver's seat surrounds door to the solution improves the stability technical problem under the driver's seat surrounds door lock state.

The fourth purpose of the utility model is to provide a bus to the solution improves independence and the security technical problem of driver's seat.

The utility model discloses a hasp locking mechanism realizes like this:

a latch locking mechanism comprising: a pawl and a ratchet wheel adapted to engage the bite, and a control linkage plate connected to the ratchet wheel such that the ratchet wheel is adapted to disengage relative to the pawl; wherein

The ratchet wheel is connected with a locking device fixing cover through a ratchet wheel torsional spring and is also connected with a locking device bottom plate through a ratchet wheel riveting pipe; the ratchet wheel is suitable for rotating around the ratchet wheel riveting pipe;

the pawl is connected with the lock fixing cover through a pawl torsion spring and is also connected with the lock bottom plate through a pawl riveting pipe; and the pawl is suitable for rotating around the pawl riveting tube;

the control linkage plate penetrates through the lock bottom plate from one side of the lock bottom plate, which is far away from the ratchet wheel, and then is abutted to the ratchet wheel so as to be suitable for releasing the engagement of the ratchet wheel and the pawl when the ratchet wheel is stirred by the control linkage plate.

In a preferred embodiment of the present invention, the pawl has a semi-concave arc-shaped receiving groove adapted for the entrance or exit of the latch.

In a preferred embodiment of the present invention, a portion of the ratchet engaged with the pawl is provided with a first ratchet tooth and a second ratchet tooth, and a ratchet groove is formed between the first ratchet tooth and the second ratchet tooth; the first ratchet teeth are far away from the accommodating groove compared with the second ratchet teeth; and

the part of the pawl meshed and connected with the ratchet wheel is provided with a first pawl tooth and a second pawl tooth which are raised, and a pawl groove is formed between the first pawl tooth and the second pawl tooth; the first pawl tooth is arranged far away from the accommodating groove compared with the second pawl tooth;

the first ratchet tooth is suitable for being meshed with the pawl groove; the first pawl tooth is adapted to engage the ratchet groove.

In a preferred embodiment of the present invention, a protruding stop is disposed on an end surface of the ratchet wheel away from the accommodating groove; the control linkage plate is suitable for abutting against the lower end face, facing the pawl, of the stop block.

In a preferred embodiment of the present invention, a surface layer made of plastic material is integrally molded on an outer surface of the pawl.

The utility model discloses a tool to lock realizes like this:

a lockset, comprising:

the lock catch locking mechanism;

the electric control trigger mechanism comprises an electromagnet unit connected with one end of the control linkage plate, which is far away from the ratchet wheel, and a controller which is suitable for triggering the electromagnet unit to attract the control linkage plate when the electromagnet unit is electrified so as to pull the control linkage plate; and

the mechanical trigger mechanism comprises an opening linkage plate which is contacted with one end of the control linkage plate, which is far away from the ratchet wheel, and a mechanical driving unit which is connected with the opening linkage plate and is suitable for driving the opening linkage plate to rotate so as to shift the control linkage plate;

the electromagnet unit and the opening linkage plate are respectively positioned below and above the control linkage plate.

In a preferred embodiment of the present invention, the mechanical driving unit includes a rotating handle connected to the opening linkage plate for rotating the opening linkage plate, an inward-opening knob connected to one end of the rotating handle, and an outward-opening linkage driving lever inserted into the other end of the rotating handle;

the inward opening knob and the outward opening linkage deflector rod can both rotate the rotating handle to deflect the opening linkage plate.

In a preferred embodiment of the present invention, the lock for the bus driver's seat surrounding door further comprises a door opening sensing unit;

the door opening sensing unit comprises a trigger rod connected with the pawl and a micro-motion sensing switch connected with the trigger rod; wherein

The trigger rod penetrates through the lock bottom plate from one side of the lock bottom plate, which is far away from the ratchet wheel, and then is inserted into the pawl;

a movable groove suitable for moving when the trigger rod rotates along with the pawl is formed in the lockset bottom plate.

The utility model discloses a bus driver's seat surrounds door is realized like this:

a bus seat surround door comprising: the lock comprises a door frame, a door body suitable for being opened relative to the door frame, a lock catch arranged on the door body, and a lock for surrounding doors of a bus driver seat arranged on the door frame.

The utility model discloses a bus is realized like this:

a bus, comprising: the bus driver's seat surrounds the door.

By adopting the technical scheme, the utility model discloses following beneficial effect has: the utility model discloses a hasp locking mechanism, the tool to lock, bus driver's seat surrounds door and bus, combine ratchet torsional spring and pawl torsional spring to realize the locking to the hasp through ratchet and the pawl that is suitable for the meshing, it has stronger locking effect to compare being suitable for grafting spring bolt and keyhole among the prior art, when being suitable for and public transport, even there is the vibrations that jolt and can cause to the tool to lock in public transport is driving, also can prevent that the hasp from breaking away from interlock ratchet and pawl, effectively improve the shock resistance and the stability in use of tool to lock.

Furthermore, the opening of the lock can be controlled through the electric control trigger mechanism and the mechanical trigger mechanism, so that the opening mode of the lock is enriched, and the lock can still be normally used when a driver forgets a key or fails in electric control.

Through the surrounding door that sets up around driver's seat, and carry out the locking of tool to lock to surrounding door, can build the driving environment independent relatively between driver's seat and passenger, avoid the passenger to the interference of driver's driving to improve public transport at the whole security of driving the in-process.

Drawings

FIG. 1 is a general view of the lock of the present invention;

FIG. 2 is a partial block diagram of the lock;

FIG. 3 is an exploded view of the lock;

FIG. 4 is a schematic view of an assembly structure of the lockset with the door body and the doorframe;

FIG. 5 is a view of the configuration of the linkage plate for unlocking the lock and the linkage plate for controlling the lock;

FIG. 6 is a view of the pawl and ratchet engagement of the lock;

FIG. 7 is a structural view of a pawl of the lock;

fig. 8 is a structural view of a ratchet of the lock.

In the figure: the lock comprises a pawl 100, a first pawl tooth 102, a second pawl tooth 103, a pawl groove 107, a ratchet 200, a containing groove 201, a first ratchet tooth 202, a second ratchet tooth 203, a ratchet groove 205, a stop block 207, a control linkage plate 300, a ratchet torsion spring 400, a ratchet riveting tube 500, a pawl torsion spring 600, a pawl riveting tube 700, an electromagnet unit 800, a controller 900, a lock fixing cover 2, a lock bottom plate 3, an opening linkage plate 5, a rotary handle 6, an inward opening knob 7, an outward opening linkage deflector rod 8, a front cover 9, a rear cover 10, a micro-motion induction switch 11, a trigger rod 12, a door body 13, a door frame 14 and a perforation 15.

Detailed Description

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.

Example 1:

referring to fig. 1 to 8, the present embodiment provides a latch locking mechanism, which is suitable for a door body 13 that generally needs to be locked, and the present embodiment only takes a case where a bus driver seat surrounds the door as an example, but the present embodiment does not represent a unique implementation environment. Specifically, the locking mechanism of the latch 20 of the present embodiment includes: a control linkage plate 300 adapted to engage the clenched pawl 100 and ratchet 200, and connected to the ratchet 200 such that the ratchet 200 is adapted to disengage relative to the pawl 100; wherein the ratchet 200 is connected with a locking device fixing cover 2 through a ratchet torsion spring 400, and the ratchet 200 is also connected with a locking device bottom plate 3 through a ratchet riveting tube 500; and ratchet 200 is adapted to rotate about ratchet rivet tube 500. I.e., with the pawl 100 and ratchet 200 engaged, the shackle 20 may be snap locked.

More specifically, the pawl 100 is connected with the lock fixing cover 2 through a pawl torsion spring 600, and the pawl 100 is further connected with the lock bottom plate 3 through a pawl riveting pipe 700; and the pawl 100 is adapted to rotate about the pawl rivet tube 700; the control linkage plate 300 penetrates through the lock base plate 3 from one side of the lock base plate 3 departing from the ratchet 200 and then abuts against the ratchet 200 so as to be suitable for releasing the engagement between the ratchet 200 and the pawl 100 when the control linkage plate 300 shifts the ratchet 200. One end of the pawl torsion spring 600 is fixedly connected with the lockset fixing cover 2, the other end of the pawl torsion spring 600 is connected with the pawl 100, and the pawl torsion spring 600 is compressed in the process that the pawl 100 rotates around the pawl riveting pipe 700; one end of the ratchet torsion spring 400 is fixedly connected with the lock fixing cover 2, and the other end of the ratchet torsion spring 400 is connected with the ratchet 200, so that the ratchet torsion spring 400 is compressed in the process that the ratchet 200 rotates around the ratchet riveting tube 500. In the state of locking the lock catch 20, the pawl torsion spring 600 and the ratchet torsion spring 400 are both in a normal state, and when the engagement state of the ratchet 200 and the pawl 100 needs to be released to release the lock catch 20, the pawl 100 rotates around the pawl rivet tube 700 relative to the lock base plate 3, and at the same time, the ratchet 200 rotates around the ratchet rivet tube 500 relative to the lock base plate 3, and at this time, the pawl torsion spring 600 and the ratchet torsion spring 400 are both compressed and deformed.

The pawl 100 of the present embodiment mainly plays a role in engaging the latch 20, that is, the pawl 100 has a half-concave arc-shaped accommodating groove 201 adapted to allow the latch 20 to enter or exit, and the ratchet 200 plays a role in limiting the accommodating groove 201, because the accommodating groove 201 of the present embodiment is a half-concave arc-shaped accommodating groove having an opening, the ratchet 200 plays a role in limiting the opening, so that after the latch 20 is inserted into the accommodating groove 201, the ratchet 200 defines the opening of the accommodating groove 201, and the latch 20 is snapped from both sides of the ratchet 200 and the pawl 100.

The specific ratchet wheel 200 and the pawl 100 are engaged, the part of the ratchet wheel 200 engaged and connected with the pawl 100 is provided with a first ratchet wheel tooth 202 and a second ratchet wheel tooth 203 which are raised, and a ratchet wheel groove 205 is formed between the first ratchet wheel tooth 202 and the second ratchet wheel tooth 203; the first ratchet teeth 202 are arranged farther from the accommodating groove 201 than the second ratchet teeth 203; and the part of the pawl 100 meshed with the ratchet wheel 200 is provided with a first pawl tooth 102 and a second pawl tooth 103 which are raised, and a pawl groove 107 is formed between the first pawl tooth 102 and the second pawl tooth 103; the first pawl tooth 102 is disposed farther from the receiving groove 201 than the second pawl tooth 103; the first ratchet tooth 202 is suitable for being meshed with the pawl groove 107 to form a first-stage locking effect on the lock catch 20, the first pawl tooth 102 is suitable for being meshed with the ratchet groove 205 to form a second-stage locking effect on the lock catch 20, the first-stage locking effect is firstly released during releasing the lock catch 20, then the second-stage locking effect is released, the lock catch 20 can be completely released only after the first-stage locking effect and the second-stage locking effect are completed, the first-stage locking effect and the second-stage locking effect are designed, the purpose is that the bus has a particularly bumpy road surface during driving, the vibration of the lock during driving is large, the first locking effect is released, and the second-stage locking effect can also play a certain role, namely, the locking stability of the lock is improved through two-stage locking protection. It should be particularly noted here that, in order to improve the smoothness of the pawl 100 and the ratchet 200 in the engaged and disengaged states and to reduce the noise in the above-described process, the first pawl tooth 102, the second pawl tooth 103, the pawl groove 107, and the first ratchet tooth 202, the second ratchet tooth 203, and the ratchet groove 205 of the present embodiment are all provided in arc-surface contact.

The control linkage plate 300 realizes the release of the engagement between the pawl 100 and the ratchet wheel 200 by rotating the pawl 100 in the direction away from the ratchet wheel 200, and a convex stop block 207 is arranged on the side end face of the ratchet wheel 200 departing from the accommodating groove 201; the control linkage plate 300 is adapted to abut a lower end surface of the stop 207 facing the pawl 100. Because control linkage board 300 passes tool to lock bottom plate 3 and pawl 100 butt, control linkage board 300 at this moment utilizes lever principle, press control linkage board 300 through the one side that deviates from pawl 100 at the locking bottom plate, make control linkage board 300 be located tool to lock bottom plate 3 when deviating from the below motion at pawl 100 one side's tip orientation pawl 100 place, control linkage board 300 at this moment is located the tip that tool to lock bottom plate 3 was equipped with one side of pawl 100 and then can move the top that deviates from pawl 100, thereby make ratchet 200 rotate for tool to lock bottom plate 3 around ratchet rivet pipe 500 towards the direction that deviates from pawl 100. During rotation of the ratchet 200, the pawl 100 is rotated in the ratchet 200 in a direction opposite to the ratchet 200, so that the engagement between the pawl 100 and the ratchet 200 is released and the latch 20 is released.

In order to reduce the noise of the pawl 100 during the engagement and disengagement processes with respect to the ratchet 200, the outer surface of the pawl 100 of the present embodiment is integrally injection molded with a surface layer made of a plastic material.

Example 2:

on the basis of the locking mechanism of the lock catch 20 in embodiment 1, the present embodiment provides a lock, which includes the locking mechanism of the lock catch 20, and an electrically controlled trigger mechanism and a mechanical trigger mechanism.

The shackle 20 locking mechanism employs the shackle 20 locking mechanism of embodiment 1. The electric control trigger mechanism comprises an electromagnet unit 800 connected with one end of the control linkage plate 300 far away from the ratchet wheel 200, and a controller 900 suitable for triggering the electromagnet unit 800 to pull the control linkage plate 300 when being electrified. The mechanical trigger mechanism comprises an opening linkage plate 5 which is contacted with one end of the control linkage plate 300 departing from the ratchet wheel 200, and a mechanical driving unit which is connected with the opening linkage plate 5 and is suitable for driving the opening linkage plate 5 to rotate so as to shift the control linkage plate 300; the electromagnet unit 800 and the opening linkage plate 5 are respectively located below and above the control linkage plate 300, in order to avoid the influence on the electric control trigger mechanism in the operation process of the mechanical trigger mechanism, in the initial state of the electromagnet unit 800 of the electric control trigger mechanism of the embodiment, namely under the condition of no power on, a vertical gap exists between the electromagnet unit 800 and the control linkage plate 300, the vertical gap is used for the operation of the mechanical trigger mechanism, when the linkage plate 5 is opened to press down the control linkage plate 300, in the process that one end of the control linkage plate 300 moves downwards towards the electromagnet unit 800, the pressure on the electromagnet unit 800 cannot be generated, namely, the vertical gap provides a space for controlling one end of the linkage plate 300 to press downwards in the operation process of the mechanical trigger mechanism.

The electromagnet units 800 can generate an adsorption effect on the control linkage plate 300 when being electrified, and the control electric plate is made of, for example, but not limited to, a metal iron material. Therefore, the electromagnet unit 800 is disposed below the control linkage plate 300, so that when the electromagnet unit 800 is powered on, a pulling action on the control linkage plate 300 is generated, and one end of the control linkage plate 300 abutted to the ratchet 200 drives the ratchet 200 to rotate towards the side away from the pawl 100 to release the latch 20.

It should also be noted that the controller 900 herein may optionally employ means such as, but not limited to, face scanning, IC card touch scanning, or password entry to activate the controller 900 to generate PWM waves for the drive circuitry of the electromagnet unit 800. For the specific excitation manner of the controller 900 of this embodiment, the detailed implementation principle is not described again, and any mature technology in the prior art may be adopted.

Specifically, the mechanical driving unit comprises a turning handle 6 connected with the opening linkage plate 5 to turn the opening linkage plate 5, an inward opening knob 7 connected with one end of the turning handle 6, and an outward opening linkage deflector rod 8 inserted with the other end of the turning handle 6; the inward opening knob 7 and the outward opening linkage deflector rod 8 can both rotate the turning handle 6 to pull the opening linkage plate 5, and the opening linkage plate 5 is provided with an interface suitable for being connected with the turning handle 6. Here, the opening linkage plate 5 can be pulled by the inward opening knob 7 or the outward opening linkage rod 8, and since the opening linkage plate 5 is located above the control linkage plate 300, the control linkage plate 300 is pressed from above the control linkage plate 300, so that the ratchet 200 can rotate relative to the pawl 100 to release the latch 20.

For the present embodiment, the electromagnet unit 800 and the rotating handle 6 are both disposed in a lock box, the lock box includes a front cover 9 and a rear cover 10, and a lock base plate 3 connected to the front cover 9 and the rear cover 10, and the lock base plate 3 is located at the side ends of the front cover 9 and the rear cover 10. The front cover 9 is arranged on one side of a driver seat, the rear cover 10 is arranged on one side of a passenger, the inward opening knob 7 is arranged on one side of the front cover 9, the driver can open the lock by rotating the inward opening knob 7, the outward opening linkage deflector rod 8 extends out of one side of the rear cover 10, and the outward opening linkage deflector rod 8 can be shifted by a key to open the lock by the key under the condition that the electric control trigger mechanism is out of order.

In an optional implementation mode, in order to facilitate mastering of locking and releasing states of the lock, the lock for the surrounding door of the bus driver seat further comprises a door opening sensing unit; the door opening sensing unit comprises a trigger rod 12 connected with the pawl 100 and a micro-motion sensing switch 11 connected with the trigger rod 12; the trigger rod 12 penetrates through the lockset bottom plate 3 from one side of the lockset bottom plate 3 departing from the ratchet wheel 200 and then is inserted into the pawl 100; the lock base plate 3 is provided with a movable groove adapted to move when the trigger lever 12 rotates along with the pawl 100. At this moment, the micro-motion induction switch 11 is connected with a warning lamp 18 which is arranged on the front cover 9, namely, the side facing the driver, when the pawl 100 rotates along with the ratchet wheel 200, the trigger rod 12 can generate a trigger signal for the micro-motion induction switch 11, and the warning lamp connected with the micro-motion induction switch 11 prompts a signal that the lockset is opened, so that in the normal driving process of the driver, if the surrounding door is abnormally opened, the driver can timely master information and act corresponding measures.

Example 3:

referring to fig. 4, on the basis of the lock of embodiment 2, the present embodiment provides a bus driver's seat surrounding door, which includes a door frame 14, a door body 13 adapted to open relative to the door frame 14, a lock catch 20 provided on the door body 13, and a lock for the bus driver's seat surrounding door provided on the door frame 14. Here, the lock box, the lock base plate 3 and the lock fixing cover 2 are all disposed on the doorframe 14, and the latch 20 is connected to the door 13, so that the latch 20 can be opened with the door 13 relative to the doorframe 14 after the latch 20 is released relative to the pawl 100 and the ratchet 200. The lock fixing cover 2 is connected with the lock bottom plate 3 and used for surrounding the ratchet 200 and the pawl 100 between the lock fixing cover 2 and the lock bottom plate 3, and a through hole 15 through which the lock catch 20 passes is formed in the lock fixing cover 2.

In order to facilitate the attachment of the latch 20 to the door 13, the latch 20 of the present embodiment includes a locking portion 21 adapted to be locked by the ratchet 200 and the pawl 100, and a fixing portion 22 integrally connected to the locking portion 21 for attachment to the door 13.

Example 4:

on the basis of the bus driver seat of embodiment 3, the present embodiment provides a bus on the basis of a bus driver seat surrounding door, and the present embodiment provides a bus, including the bus driver seat surrounding door of embodiment 3, the bus driver seat surrounding door is arranged around the driver seat, so that the driver seat forms an independent driving operation zone relative to a passenger activity zone, the driver is prevented from being interfered by passengers during driving, and the overall safety of bus driving is improved.

The above embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above embodiments are only examples of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Claims

1. A latch locking mechanism, comprising: a pawl and a ratchet wheel adapted to engage the bite, and a control linkage plate connected to the ratchet wheel such that the ratchet wheel is adapted to disengage relative to the pawl; wherein

2. A latch locking mechanism according to claim 1, wherein said pawl has a semi-concave arcuate receiving channel adapted for entry or exit of the latch.

3. A latch locking mechanism according to claim 2, characterized in that the part of the ratchet wheel which is in meshing connection with the pawl is provided with first and second protruding ratchet teeth, and a ratchet groove is formed between the first and second ratchet teeth; the first ratchet teeth are far away from the accommodating groove compared with the second ratchet teeth; and

4. A latch locking mechanism according to any of claims 2 or 3, wherein a raised stop is provided on the side end face of the ratchet wheel facing away from the receiving groove; the control linkage plate is suitable for abutting against the lower end face, facing the pawl, of the stop block.

5. A latch locking mechanism according to claim 1, wherein the outer surface of the pawl is integrally moulded with a skin of plastics material.

6. The utility model provides a bus driver's seat is tool to lock for surrounding door which characterized in that includes:

the lock catch locking mechanism adopts the lock catch locking mechanism as claimed in any one of claims 1 to 5;

7. The lock for the bus driver's seat surrounding door according to claim 6, wherein said mechanical driving unit comprises a rotary handle for connecting with said opening linkage plate to shift the opening linkage plate, an inward opening knob connected with one end of said rotary handle, and an outward opening linkage shift lever inserted with the other end of said rotary handle;

8. The lock for bus seat surrounding door according to any one of claims 6 or 7, wherein the lock for bus seat surrounding door further comprises a door opening sensing unit;

9. A bus seat surround door, comprising: the bus driver's seat surrounding door lock comprises a door frame, a door body suitable for being opened relative to the door frame, a lock catch arranged on the door body, and the lock for the bus driver's seat surrounding door arranged on the door frame according to any one of claims 1-8.

10. A bus comprising a bus seat surround door as claimed in claim 9.