Automatic ejection mechanism for large square tongue

Abstract

The invention relates to a large square tongue automatic pop-up mechanism in the field of door locks, which comprises a lock body box and a side batten, an inclined tongue assembly, an anti-insertion tongue, a large square tongue and a driving assembly are arranged in the lock body box, the driving assembly comprises a shifting fork, an anti-insertion shifting piece and a square tongue blocking piece, the large square tongue is provided with a locking groove and a push-pull groove, the anti-insertion shifting piece is slidably arranged in the lock body box, and the square tongue blocking piece is arranged in the locking groove. An inclined pushing surface and a locking part are arranged on the dead bolt blocking piece, the locking part can be clamped into the locking groove in a paired mode, an unlocking part is arranged on the insertion-preventing bolt, the shifting fork is rotationally arranged in the lock body box, a push-pull column is arranged on the shifting fork and inserted into the push-pull groove of the large dead bolt in a paired mode, and a bias spring used for driving the shifting fork to rotate is arranged in the lock body box. An inserting tongue spring and a blocking piece spring are arranged in the lock body box, the inserting tongue spring is used for driving the anti-inserting tongue to pop out of the inserting tongue opening, the blocking piece spring is used for driving the square tongue blocking piece to enable the locking part to be inserted into the locking groove, the large square tongue can pop out automatically after the door is closed, and the situation that the door needs to be locked manually like a traditional mechanical door lock is not needed.

Description

Technical Field

[0001] The invention relates to the field of door locks, in particular to an automatic ejection mechanism for a large square tongue. Background Art

[0002] Door locks are common safety devices in daily life. Their main function is to ensure the safety of people's living and working spaces. Through door locks, people can control the people entering and leaving a specific area, thereby effectively preventing unauthorized intrusion and theft. The reliability and safety of door locks are directly related to the safety of people's lives and property. Therefore, the design and manufacture of door locks have always received widespread attention and attention.

[0003] Door locks usually consist of a lock body, a latch bolt, a square bolt, a lock cylinder, a handle and other parts. Among them, the latch bolt and the square bolt are one of the key parts of the door lock. They realize the locking and unlocking functions of the door lock by cooperating with the door frame. In the door lock system, the square bolt is usually used in combination with the latch bolt. When the door needs to be locked, the latch bolt will automatically extend and snap into the lock hole of the door frame to achieve preliminary locking. The square bolt needs to be manually rotated to reverse the lock, further enhancing the security of the door lock. The square bolt is widely used in door lock systems that require higher security due to its strong firmness and fixity. For example, on the exterior doors of hotels, apartments, residences and other places, the combination of latch bolt and square bolt is usually used to enhance the security of the door lock.

[0004] In the traditional door lock design, there are two ways to make the square tongue pop out to achieve locking. Electronic type: The large square tongue is popped out by driving a motor or electromagnetic device. Its structure is complex, the manufacturing cost is high and it is easy to damage. It cannot also have the function of opening the door with a mechanical key. Mechanical type: Users usually need to drive the square tongue to pop out by manual actions such as rotating a key or a handle. This manual operation method not only increases the cumbersomeness of use, but may also cause the door to be forgotten. Summary of the invention

[0005] In order to overcome the shortcomings of the existing technical solutions, the present invention provides a large square tongue automatic pop-up mechanism, which can effectively solve the technical problem that the mechanical square tongue needs to be manually operated to pop out.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A large square tongue automatic pop-up mechanism comprises a lock body box and a side plate strip, wherein an inclined tongue assembly, an anti-insertion tongue, a large square tongue and a driving assembly are arranged in the lock body box, and the driving assembly is used to drive the inclined tongue assembly, the anti-insertion tongue and the large square tongue to move horizontally in the lock body box, so as to realize retraction or pop-up, and an inclined tongue opening, an inserting tongue opening and a square tongue opening are arranged on the side plate strip, and when the inclined tongue assembly, the anti-insertion tongue and the large square tongue pop up, one end close to the side plate strip can pass through the inclined tongue opening and the square tongue opening and be inserted into the door frame, and the driving assembly comprises a shift fork, an anti-insertion paddle and a square tongue baffle, a locking groove and a push-pull groove are arranged on the large square tongue, the anti-insertion paddle can be slidably arranged in the lock body box, and the square tongue baffle is provided with an inclined push surface and a locking portion, and the lock The stop portion can be matched and inserted into the locking groove, and an unlocking portion is provided on the anti-insertion tongue. When the anti-insertion tongue is retracted, the unlocking portion can squeeze the inclined push surface to move the square tongue baffle, thereby separating the locking portion from the locking groove. The shift fork is rotatably arranged in the lock body box, and a push-pull column is arranged on the shift fork. The push-pull column is matched and inserted into the push-pull groove of the large square tongue. A bias spring for driving the shift fork to rotate is arranged in the lock body box. When the shift fork rotates, the push-pull column moves around the axis of the shift fork, and the push-pull column slides in the push-pull groove and pushes the large square tongue to move. A tongue spring and a baffle spring are arranged in the lock body box. The tongue spring is used to drive the anti-insertion tongue to pop out from the tongue mouth, and the baffle spring is used to drive the square tongue baffle to insert the locking portion into the locking groove.

[0008] The driving assembly also includes a straight plate, a pistol plate, a key plate and a shift block. The anti-insertion shift plate, the straight plate, the pistol plate, the key plate and the shift block are respectively rotatably arranged in the lock body box. A limiting portion and a swing arm are arranged on the anti-insertion shift plate. The limiting portion is used to limit the retraction of the oblique tongue assembly into the lock body box. The shift block is used to connect with the lock head. The rotation of the shift block can drive the key plate to rotate. The rotation of the key plate can drive the pistol plate to swing. The swing of the pistol plate can simultaneously drive the retraction of the oblique tongue assembly, the reset of the shift fork and the rotation of the straight plate. The rotation of the straight plate pushes the swing arm to separate the limiting portion from the oblique tongue assembly.

[0009] Furthermore, the inclined tongue assembly includes an inclined tongue block, a push rod, a gasket and a spring. The push rod is horizontally arranged at one end of the inclined tongue block close to the lock body box, the gasket is slidably arranged on the surface of the push rod, the spring is arranged between the gasket and the inclined tongue block, a limit plate is arranged on the lock body box, and the end of the gasket away from the spring presses the surface of the limit plate. The push rod is provided with a rear baffle, and the pistol plate is provided with a push arm. When the pistol plate swings, the push arm can push the rear baffle to make the inclined tongue block move horizontally into the lock body box.

[0010] Furthermore, a horizontal guide groove is provided on the large square tongue, and a guide column is provided on the shift fork, the axis of the guide column coincides with the rotation axis of the shift fork, and when the shift fork drives the large square tongue to move, the guide column causes the large square tongue to move horizontally along the guide groove.

[0011] Furthermore, a slide groove is provided on the inner wall of the lock body box, and a slider which is matched and inserted into the slide groove is provided on the square tongue baffle, so that the square tongue baffle can move along the slide groove, and the square tongue baffle is arranged between the side wall of the large square tongue and the inner wall of the lock body box.

[0012] Furthermore, the pistol piece is provided with a retracting protrusion for moving the shift fork, and the shift fork is provided with a retracting groove. When the pistol piece swings, the retracting protrusion pushes the retracting groove, causing the shift fork to rotate and retract the large square tongue into the lock body box.

[0013] Furthermore, an unlocking push head and a round-headed tooth are respectively provided at both ends of the straight-shaped piece, and a driving opening cooperating with the round-headed tooth is provided on the pistol piece. The round-headed tooth can swing in the driving opening. When the pistol piece swings, the driving opening pushes the round-headed tooth to rotate the straight-shaped piece, and the unlocking push head can push the swing arm of the anti-insertion piece to make the limiting part of the anti-insertion piece stay away from the oblique tongue assembly.

[0014] Furthermore, the shift fork is provided with a square hole for connecting the handle, and the axis of the square hole coincides with the axis of rotation of the shift fork.

[0015] Furthermore, a horizontal limiting groove is arranged on the inner wall of the lock body box, and a guide block is arranged on the side wall of the anti-insertion tongue, and the anti-insertion tongue moves horizontally along the limiting groove through the guide block.

[0016] Furthermore, a needle spring is connected to the anti-insertion sheet, one end of the needle spring away from the anti-insertion sheet contacts the inner wall of the lock body box, a bending sleeve is provided on the lock body box, a positioning ring groove is provided on the side wall of the bending sleeve groove, and the middle part of the needle spring contacts the inner wall of the positioning ring groove.

[0017] Furthermore, a limiting sleeve is provided on the lock body box, and a positioning ring groove is also provided on the limiting sleeve. One end of the tongue spring is connected to the anti-insertion tongue, and the other end contacts the positioning ring groove on the limiting sleeve. The middle part of the tongue spring bypasses the positioning ring groove on the bending sleeve.

[0018] Compared with the prior art, the present invention has the following beneficial effects: the large square tongue can pop out automatically after the door is closed, and there is no need to manually lock the door like traditional mechanical door locks, which improves the portability and safety of use. In normal state, the large square tongue is locked in the lock body box by the square tongue blocking piece. When the door is closed, the anti-insertion tongue is squeezed back into the lock body box by the door frame, and the unlocking part squeezes the inclined push surface to move the square tongue blocking piece, thereby separating the locking part from the locking groove to release the large square tongue from the limit, and driving the shift fork to rotate under the action of the bias spring, and then the sliding of the push-pull column in the push-pull groove pushes the large square tongue to move and pop out, so that the large square tongue can pop out quickly and stably after the door is closed, effectively improving the safety and sealing of the door lock, and also greatly improving the convenience and comfort of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a structural explosion diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the state where the middle tongue is retracted in the present invention;

[0021] Figure 3 A schematic diagram of the middle tongue in the present invention in a pop-up state;

[0022] Figure 4 It is a schematic diagram of the cooperation between the square tongue baffle, the large square tongue and the anti-insertion tongue when the square tongue is retracted in the present invention;

[0023] Figure 5 A schematic diagram of the middle tongue ejection process in the present invention;

[0024] Figure 6 It is a schematic diagram of the pistol piece driven by the shift block in the present invention;

[0025] Figure 7 It is a schematic diagram of the pistol piece driving the shift fork in the present invention;

[0026] Figure 8 It is a schematic diagram of the pistol piece driving the straight piece and the anti-insertion piece in the present invention;

[0027] Fig. 9 It is a schematic diagram of the pistol piece driving the latch bolt assembly in the present invention;

[0028] Numbers in the figure:

[0029] 1-Lock box;

[0030] 2-side strips, 201-oblique tongue, 202-inserted tongue, 203-square tongue;

[0031] 3-oblique tongue assembly, 301-oblique tongue block, 3011-limiting step, 302-push rod, 303-gasket, 304-return spring, 305-rear baffle;

[0032] 4-anti-insertion tongue, 401-unlocking part;

[0033] 5-large square tongue, 501-locking groove, 502-pushing groove, 503-guide groove;

[0034] 6-shift fork, 601-push-pull column, 602-guide column, 603-retraction slot;

[0035] 7-anti-insertion sheet, 701-limiting part, 702-swing arm;

[0036] 8-square tongue baffle, 801-oblique push surface, 802-locking part;

[0037] 9-deflection spring, 10-tongue spring, 11-blocking spring, 12-needle spring, 13-bending sleeve, 14-limiting sleeve;

[0038] 15-slotted piece, 1501-unlocking push head, 1502-round head latch;

[0039] 16-pistol piece, 1601-driving opening, 1602-push arm, 1603-retracting bump;

[0040] 17-key blade, 18-shift block, 19-limit plate. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Combine the following Figure 1-Figure 9 A large square tongue automatic ejection mechanism of the present invention is described in detail:

[0043] A large square tongue 5 automatic pop-up mechanism comprises a lock body box 1 and a side strip 2. The lock body box 1 is provided with a slant tongue assembly 3, an anti-insertion tongue 4, a large square tongue 5 and a driving assembly. The driving assembly is used to drive the slant tongue assembly 3, the anti-insertion tongue 4 and the large square tongue 5 to move horizontally in the lock body box 1, so as to achieve retraction or pop-up. The side strip 2 is provided with a slant tongue opening 201, an insertion tongue opening 202 and a square tongue opening 203. When the slant tongue assembly 3, the anti-insertion tongue 4 and the large square tongue 5 pop up, one end close to the side strip 2 can be penetrated. The door is inserted into the door frame through the oblique tongue opening 201 and the square tongue opening 203. The driving assembly includes a shift fork 6, an anti-insertion sheet 7 and a square tongue baffle 8. The large square tongue 5 is provided with a locking groove 501 and a push-pull groove 502. The anti-insertion sheet 7 can be slidably arranged in the lock body box 1. The square tongue baffle 8 is provided with an oblique push surface 801 and a locking portion 802. The locking portion 802 can be matched and inserted into the locking groove 501. The anti-insertion tongue 4 is provided with an unlocking portion 401. When the anti-insertion tongue 4 is retracted, the unlocking portion 401 The inclined push surface 801 can be squeezed to move the square tongue baffle 8, so that the locking part 802 is separated from the locking groove 501. The fork 6 is rotatably arranged in the lock body box 1. The fork 6 is provided with a push-pull column 601, which is paired and inserted into the push-pull groove 502 of the large square tongue 5. The lock body box 1 is provided with a bias spring 9 for driving the fork 6 to rotate. When the fork 6 rotates, the push-pull column 601 moves around the axis of the fork 6, and the push-pull column 601 slides in the push-pull groove 502 and pushes the large square tongue. 5 moves, a tongue spring 10 and a baffle spring 11 are provided in the lock body box 1, the tongue spring 10 is used to drive the anti-insertion tongue 4 to pop out from the tongue opening 202, and the baffle spring 11 is used to drive the square tongue baffle 8 to insert the locking portion 802 into the locking groove 501, a sliding groove is provided on the inner wall of the lock body box 1, and a sliding block matched to be inserted into the sliding groove is provided on the square tongue baffle 8, and the square tongue baffle 8 is arranged between the side wall of the large square tongue 5 and the inner wall of the lock body box 1, so that the square tongue baffle 8 moves along the sliding groove.

[0044] The anti-insertion sheet 7 is connected to a needle spring 12, and one end of the needle spring 12 away from the anti-insertion sheet 7 contacts the inner wall of the lock body box 1. A bending sleeve 13 is provided on the lock body box 1, and a positioning ring groove is provided on the side wall of the bending sleeve 13. The middle part of the needle spring 12 contacts the inner wall of the positioning ring groove. A limiting sleeve 14 is provided on the lock body box 1, and a positioning ring groove is also provided on the limiting sleeve 14. One end of the tongue spring 10 is connected to the anti-insertion tongue 4, and the other end contacts the positioning ring groove on the limiting sleeve 14. The middle part of the tongue spring 10 bypasses the positioning ring groove on the bending sleeve 13.

[0045] The driving assembly also includes a straight piece 15, a pistol piece 16, a key piece 17 and a shift block 18. The anti-insertion shift piece 7, the straight piece 15, the pistol piece 16, the key piece 17 and the shift block 18 are respectively rotatably arranged in the lock body box 1. A limiting portion 701 and a swing arm 702 are arranged on the anti-insertion shift piece 7. The limiting portion 701 is used to limit the retraction of the inclined tongue assembly 3 into the lock body box 1. The shift block 18 is used to be connected to the lock head. The rotation of the shift block 18 can drive the key piece 17 to rotate. The rotation of the key piece 17 can drive the pistol piece 16 to swing. The swing of the pistol piece 16 can simultaneously drive the retraction of the inclined tongue assembly 3, the reset of the shift fork 6 and the rotation of the straight piece 15. The rotation of the straight piece 15 pushes the swing arm 702 to separate the limiting portion 701 from the inclined tongue assembly 3.

[0046] The inclined tongue assembly 3 includes an inclined tongue block 301, a push rod 302, a gasket 303 and a return spring 304. The push rod 302 is horizontally arranged at one end of the inclined tongue block 301 close to the lock body box 1, the gasket 303 is slidably arranged on the surface of the push rod 302, and the return spring 304 is arranged between the gasket 303 and the inclined tongue block 301. A limit plate 19 is arranged on the lock body box 1, and one end of the gasket 303 away from the return spring 304 presses the surface of the limit plate 19. A rear baffle 305 is arranged on the push rod 302, and a pistol plate 16 is arranged on the pistol plate 16. A push arm 1602 is provided. When the pistol piece 16 swings clockwise, the push arm 1602 can push the rear baffle 305, so that the inclined tongue block 301 is horizontally moved and retracted into the lock body box 1 through the rear baffle 305. A limiting step 3011 is provided on the inclined tongue block 301. The anti-insertion and prying piece 7 rotates counterclockwise under the action of the needle spring 12, so that the limiting portion 701 contacts the limiting step 3011, thereby locking the inclined tongue block 301 so that the inclined tongue block 301 cannot be retracted, thereby preventing the inclined tongue block 301 from being pushed and retracted into the lock body box 1 under the action of external force.

[0047] The inner wall of the lock body box 1 is provided with a horizontal limiting groove, and the side wall of the anti-insertion tongue 4 is provided with a guide block, and the anti-insertion tongue 4 moves horizontally along the limiting groove through the guide block.

[0048] A guide groove 503 is horizontally arranged on the large square tongue 5, and a guide column 602 is arranged on the fork 6. The axis of the guide column 602 coincides with the rotation axis of the fork 6. When the fork 6 drives the large square tongue 5 to move, one end of the large square tongue 5 limits the large square tongue 5 through the side plate 2, so that the large square tongue 5 moves in the square tongue mouth 203, and the other end makes the large square tongue 5 move along the guide groove 503 through the guide column 602, ensuring that the large square tongue 5 can only move horizontally. A retraction protrusion 1603 for shifting the fork 6 is arranged on the pistol piece 16, and a retraction groove 603 is arranged on the fork 6. When the pistol piece 16 swings clockwise, the retraction protrusion 1603 pushes the inner wall of the retraction groove 603, so that the fork 6 rotates counterclockwise, thereby retracting the large square tongue 5 into the lock body box 1.

[0049] An unlocking push head 1501 and a round-headed tooth 1502 are respectively provided at both ends of the one-piece piece 15. A driving opening 1601 engaged with the round-headed tooth 1502 is provided on the pistol piece 16. The round-headed tooth 1502 can swing in the driving opening 1601. When the pistol piece 16 swings, the driving opening 1601 pushes the round-headed tooth 1502 to rotate the one-piece piece 15. When the one-piece piece 15 rotates counterclockwise, the unlocking push head 1501 can push the swing arm 702 of the anti-insertion and prying piece 7 to rotate clockwise, and the limiting portion 701 is lifted away from the inclined tongue block 301, thereby realizing the unlocking of the inclined tongue block 301.

[0050] The shift fork 6 is provided with a square hole for connecting the handle, and the axis of the square hole coincides with the axis of rotation of the shift fork 6 .

[0051] The large square tongue 5 can pop out automatically after the door is closed. There is no need to manually lock the door like traditional mechanical door locks, which improves the portability and safety of use. In the normal state, the large square tongue 5 is locked in the lock body box 1 by the square tongue blocking piece 8. When the door is closed, the anti-insertion tongue 4 is squeezed back into the lock body box 1 by the door frame, and the unlocking part 401 squeezes the inclined push surface 801 to move the square tongue blocking piece 8, thereby separating the locking part 802 from the locking groove 501 to release the large square tongue 5 from the limit, and under the action of the bias spring 9, the shift fork 6 is driven to rotate, and then the sliding of the push-pull column 601 in the push-pull groove 502 pushes the large square tongue 5 to move and pop out, so that the large square tongue 5 can pop out quickly and stably after the door is closed, effectively improving the safety and sealing of the door lock. At the same time, there is no need for complex electronic system control when locking the door, which not only reduces the cost but also improves the durability and reliability of the mechanism. The automatic pop-up function of the large square tongue 5 of the lock core and the anti-insertion function are realized by using the same set of mechanical structures, which reduces parts and reduces costs. While realizing the automatic pop-up of the large square tongue 5, the function of opening and unlocking the door with a mechanical key is retained.

[0052] Working principle:

[0053] When the door is closed, the inclined tongue block 301 and the anti-insertion tongue 4 are squeezed by the door frame, so that they move horizontally inward and are retracted into the lock body box 1. After the anti-insertion tongue 4 moves inward, the unlocking portion 401 squeezes the inclined push surface 801 to make the square tongue blocking piece 8 move along the slide groove, and the locking portion 802 disengages from the locking groove 501. At this time, the large square tongue 5 is in the unlocked state, and the inclined tongue block 301 is retracted into the lock body box 1 to make the push rod 302 away from the side plate strip 2. The inclined tongue block 301 and the limit plate 19 The distance between them is shortened and the reset spring 304 is squeezed. When the door is closed, the shift fork 6 rotates clockwise under the action of the bias spring 9, and the push-pull column 601 slides in the pull groove to push the large square tongue 5 to pop out, and the inclined tongue block 301 pops out under the action of the reset spring 304. The anti-insertion and pulling piece 7 rotates counterclockwise under the action of the needle spring 12, and the limiting portion 701 abuts against the limiting step 3011. The inclined tongue block 301 is in a locked state, thereby achieving locking after closing the door.

[0054] When the door is opened, insert the key into the lock and turn the key. The key drives the shift block 18 to rotate clockwise through the lock. The shift block 18 drives the key piece 17 to rotate counterclockwise, thereby pushing the pistol piece 16 to swing clockwise. When the pistol piece 16 swings clockwise, it can simultaneously drive the oblique tongue assembly 3, the shift fork 6 and the straight piece 15. The inner wall of the retraction groove 603 is pushed by the retraction protrusion 1603, so that the shift fork 6 rotates counterclockwise and drives the large square tongue 5 to be retracted. Under the action of the tongue spring 10, the anti-insertion tongue 4 pops out. After the anti-insertion tongue 4 pops out, the square tongue baffle 8 is reset under the action of the baffle spring 11, and the locking portion 802 is inserted. The locking groove 501 locks the large square tongue 5 in the lock body box 1, and by driving the opening 1601 to mesh with the round head tooth 1502, the pistol piece 16 swings clockwise to drive the straight piece 15 to rotate counterclockwise, and the unlocking push head 1501 pushes the swing arm 702 of the anti-insertion and prying piece 7 to make the anti-insertion and prying piece 7 rotate clockwise, and the limiting part 701 is lifted and separated from the limiting step 3011, thereby realizing the unlocking of the inclined tongue block 301. After the inclined tongue block 301 is unlocked, the pistol piece 16 pulls the push rod 302 through the push arm 1602, and the push rod 302 drives the inclined tongue block 301 to be retracted into the lock body box 1, thereby realizing the door opening action.

[0055] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A large square tongue automatic pop-up mechanism, comprising a lock body box and a side plate, wherein a skew tongue assembly, an anti-insertion tongue, a large square tongue and a driving assembly are arranged in the lock body box, wherein the driving assembly is used to drive the skew tongue assembly, the anti-insertion tongue and the large square tongue to move horizontally in the lock body box, thereby realizing retraction or pop-up, and the side plate is provided with a skew tongue opening, an insertion tongue opening and a square tongue opening, and when the skew tongue assembly, the anti-insertion tongue and the large square tongue are popped out, the end close to the side plate can pass through the skew tongue opening and the square tongue opening and be inserted into the door frame, characterized in that: The locking mechanism is a kind of key which is used to lock the locking mechanism, and the key is used to lock the locking mechanism, so that the locking mechanism can be locked in the locking groove when the anti-insertion tongue is retracted. The driving assembly also includes a straight plate, a pistol plate, a key plate and a shift block. The anti-insertion shift plate, the straight plate, the pistol plate, the key plate and the shift block are respectively rotatably arranged in the lock body box. A limiting portion and a swing arm are arranged on the anti-insertion shift plate. The limiting portion is used to limit the retraction of the oblique tongue assembly into the lock body box. The shift block is used to connect with the lock head. The rotation of the shift block can drive the key plate to rotate. The rotation of the key plate can drive the pistol plate to swing. The swing of the pistol plate can simultaneously drive the retraction of the oblique tongue assembly, the reset of the shift fork and the rotation of the straight plate. The rotation of the straight plate pushes the swing arm to separate the limiting portion from the oblique tongue assembly.

2. The large square tongue automatic ejection mechanism according to claim 1, characterized in that: The inclined tongue assembly includes an inclined tongue block, a push rod, a gasket and a spring. The push rod is horizontally arranged at one end of the inclined tongue block close to the lock body box, the gasket is slidably arranged on the surface of the push rod, the spring is arranged between the gasket and the inclined tongue block, a limit plate is arranged on the lock body box, and the end of the gasket away from the spring presses the surface of the limit plate. The push rod is provided with a rear baffle, and the pistol plate is provided with a push arm. When the pistol plate swings, the push arm can push the rear baffle to make the inclined tongue block move horizontally into the lock body box.

3. The large square tongue automatic ejection mechanism according to claim 1, characterized in that: The large square tongue is provided with a horizontal guide groove, the shift fork is provided with a guide column, the axis of the guide column coincides with the rotation axis of the shift fork, and when the shift fork drives the large square tongue to move, the guide column causes the large square tongue to move horizontally along the guide groove.

4. The large square tongue automatic ejection mechanism according to claim 1, characterized in that: The inner wall of the lock box is provided with a slide groove, and the square tongue baffle is provided with a slider matched and inserted into the slide groove, so that the square tongue baffle can move along the slide groove, and the square tongue baffle is arranged between the side wall of the large square tongue and the inner wall of the lock box.

5. The large square tongue automatic ejection mechanism according to claim 1, characterized in that: The pistol piece is provided with a retracting protrusion for moving the shift fork, and the shift fork is provided with a retracting groove. When the pistol piece swings, the retracting protrusion pushes the retracting groove, so that the shift fork rotates and retracts the large square tongue into the lock body box.

6. The large square tongue automatic ejection mechanism according to any one of claims 1 to 5, characterized in that: An unlocking push head and a round-headed tooth are respectively provided at the two ends of the straight piece, and a driving opening matched with the round-headed tooth is provided on the pistol piece. The round-headed tooth can swing in the driving opening. When the pistol piece swings, the driving opening pushes the round-headed tooth to rotate the straight piece, and the unlocking push head can push the swing arm of the anti-insertion piece to make the limiting part of the anti-insertion piece stay away from the oblique tongue assembly.

7. The large square tongue automatic ejection mechanism according to any one of claims 1 to 5, characterized in that: The shift fork is provided with a square hole for connecting the handle, and the axis of the square hole coincides with the axis of rotation of the shift fork.

8. The large square tongue automatic ejection mechanism according to any one of claims 1 to 5, characterized in that: A horizontal limiting groove is arranged on the inner wall of the lock body box, and a guide block is arranged on the side wall of the anti-insertion tongue, and the anti-insertion tongue moves horizontally along the limiting groove through the guide block.

9. The large square tongue automatic ejection mechanism according to any one of claims 1 to 5, characterized in that: The anti-insertion sheet is connected with a needle spring, one end of the needle spring away from the anti-insertion sheet contacts the inner wall of the lock body box, a bending sleeve is provided on the lock body box, a positioning ring groove is provided on the side wall of the bending sleeve groove, and the middle part of the needle spring contacts the inner wall of the positioning ring groove.

10. The large square tongue automatic ejection mechanism according to claim 9, characterized in that: The lock body box is provided with a limiting sleeve, which is also provided with a positioning ring groove. One end of the tongue spring is connected with the anti-insertion tongue, and the other end contacts with the positioning ring groove on the limiting sleeve. The middle part of the tongue spring bypasses the positioning ring groove on the bending sleeve.

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