Lock head assembly with anti-prying mechanism and escape lock using lock head assembly

Abstract

The invention relates to the field of locks, in particular to a lock head assembly and an escape lock using the lock head assembly. The lock head assembly comprises a lock head shell, a spring bolt linkage mechanism and an anti-prying mechanism, and is characterized in that the lock head shell is used for installing the spring bolt linkage mechanism and the anti-prying mechanism; the spring bolt linkage mechanism comprises a main spring bolt, a first elastic piece driving the main spring bolt to pop out and a starting plate driving the spring bolt to retract when the pressing rod assembly is stressed, and a limiting rod is arranged on the side face of the main spring bolt. The anti-prying mechanism comprises a safety tongue, a safety reset elastic piece, a clutch plate and a second elastic piece, the safety reset elastic piece is used for driving the safety tongue to pop out, the clutch plate is rotationally connected with the lock head shell, and the second elastic piece drives the clutch plate to rotate towards the safety tongue. The clutch plate is located at the locking position where the clutch plate is matched with the limiting rod to limit retraction of the main spring bolt. When the safety tongue pops up or the starting plate is pressed, the safety tongue or the starting plate can push the clutch plate to be separated from the locking position.

Description

Technical Field

[0001] The present application relates to the field of locks, and in particular to a lock assembly with an anti-pry mechanism and an escape lock using the lock assembly. Background Art

[0002] The American Standard pressure rod escape lock is a standard feature of emergency exits in large supermarkets and retail establishments. Its core function is to enable internal personnel to quickly unlock the door with a single push of the push rod, ensuring life safety in scenarios such as fires. However, when used in supermarkets, there are cases where criminals escape through doors installed with escape locks. The current solution to this behavior is to install a sensor in the escape lock to sound an alarm when the escape lock is opened. Since the sensor can only be installed in the pressure rod, criminals still have ways to bypass the pressure rod and directly operate the lock tongue to unlock it. For example, by inserting a hard card or thin tool into the door gap to force the lock tongue to retract and unlock. This type of operation completely circumvents the pressure rod transmission structure, causing the sensor to fail to detect the displacement of the pressure rod or transmission structure and remain silent, resulting in the failure of the alarm and anti-theft system.

[0003] In order to solve the above technical problems, the applicant has designed an escape lock which cannot be unlocked by pressing the lock tongue to retract when the escape lock is in a locked state. Summary of the Invention

[0004] In order to prevent illegal personnel from circumventing the alarm anti-theft system by pressing the lock tongue to retract and unlock it, the present application provides a lock assembly with an anti-pry mechanism and an escape lock using the lock assembly.

[0005] In the first aspect, the present application provides a lock assembly with an anti-pry mechanism, which adopts the following technical solution: A lock assembly with an anti-pry mechanism, comprising a lock housing, a lock tongue linkage mechanism and an anti-pry mechanism, wherein: The lock housing is used to install the lock tongue linkage mechanism and the anti-pry mechanism; The lock tongue linkage mechanism includes a main lock tongue, a first elastic member that drives the main lock tongue to pop outward, and a starting plate that drives the lock tongue to retract when the pressure rod assembly is stressed. A limiting rod is provided on the side of the main lock tongue; The anti-pry mechanism includes a safety tongue, a safety reset elastic member, a clutch plate and a second elastic member. The safety reset elastic member is used to drive the safety tongue to pop outward, and the clutch plate is rotatably connected to the lock housing. The second elastic member drives the clutch plate to rotate in the direction of the safety tongue. When the safety tongue is in a retracted state, the clutch plate is in a locked position that cooperates with the limit rod to limit the retraction of the main lock tongue; when the safety tongue pops out or the start plate is pressed, the safety tongue or the start plate can push the clutch plate out of the locked position.

[0006] By adopting this technical solution, when the escape lock is closed, the main lock tongue pops out and locks, and the safety tongue abuts the sealing seat and is in a retracted state. At this time, the clutch plate is in a locked position, cooperating with the limit rod to limit the retraction of the main lock tongue. Therefore, the escape lock cannot be unlocked by pressing the main lock tongue. When the activation plate is pressed normally, the activation plate pushes the clutch plate out of the locked position, thus not affecting the normal opening of the escape lock. When the door is open, with both the safety tongue and the main lock tongue in the popped-out position, the safety tongue pushes the clutch plate out of the locked position, thus not affecting the retraction of the main lock tongue when the door is closed.

[0007] Preferably, the first elastic member is a first torsion spring, the second elastic member is a second torsion spring, and the safety reset elastic member is a safety reset spring.

[0008] Preferably, the safety tongue includes a safety push plate for abutting against the clutch plate, and the safety push plate is provided with a slope section on the side facing the clutch plate, and the slope section is inclined toward the side away from the clutch plate in the direction in which the safety tongue pops out.

[0009] By adopting the above technical solution, a slope section is provided which is inclined in the direction of the main lock tongue popping out and away from the clutch plate, so that the clutch plate can be gradually pushed out of the locked position during the process of the safety tongue popping out.

[0010] Preferably, the safety tongue includes a safety push plate for abutting against the clutch plate, and the safety push plate is provided with a first straight section, a curved section, an inclined section, and a second straight section in sequence on the side facing the clutch plate. The curved section and the inclined section are inclined toward the side away from the clutch plate in the direction in which the main lock tongue pops out, and the inclination of the inclined section is greater than the inclination of the curved section. The curved section is an inward concave curve, and a clutch protrusion is provided on the middle part of the clutch plate toward the side of the safety push plate.

[0011] By adopting the above technical solution, when the safety push plate pushes the clutch plate, when the clutch protrusion reaches the inclined section from the second straight section, the clutch plate is first quickly lifted out of the locked position, and then slowly lifted upward through the curved section until it reaches the first straight section.

[0012] Preferably, the main lock tongue is rotatably connected to the lock head housing through the first lock tongue center bolt, the starting plate is rotatably connected to the lock head housing through the starting plate center bolt, the clutch plate is provided with a clutch force-bearing member that abuts against the starting plate toward the side of the main lock tongue, and the lower side of the clutch plate away from the end of the starting plate center bolt is provided with a clutch groove, and the clutch groove is provided with a clutch force-bearing surface in the movement direction of the limit rod, and the direction of the force applied to the clutch force-bearing surface when the limit rod abuts against the clutch force-bearing surface points to the direction of driving the clutch plate to rotate toward the safety push plate.

[0013] By adopting the above technical solution, when the limit lever contacts the clutch force surface, the force exerted on the clutch force surface drives the clutch plate to rotate toward the safety push plate. When the clutch plate contacts the safety push plate, it cannot rotate, and the limit lever cannot drive the clutch plate to move. Therefore, in the locked state, when the main lock tongue is pressed, the limit lever will not drive the clutch plate to rise, and therefore, it is impossible to unlock the door by pressing the main lock tongue.

[0014] Preferably, when the main lock tongue is in the pop-up state and the safety tongue is in the retracted state, a gap is left between the limit rod and the clutch force surface / the start plate abuts against the clutch plate earlier than the main lock tongue during rotation.

[0015] By adopting the above technical solution, when the main lock tongue is in the pop-up state and the safety tongue is in the retracted state, a gap is left between the limit rod and the clutch force surface, or the start plate abuts against the clutch plate earlier than the main lock tongue during rotation, so that when the start plate is pressed, the clutch force member can drive the clutch plate to lift before the limit rod abuts against the clutch plate, which will not affect the normal door opening action.

[0016] Preferably, the safety tongue includes a safety base plate located between the main lock tongue and the lock base plate, and safety side plates located on both sides of the safety base plate and extending toward the upper and lower sides of the main lock tongue. The safety push plates are provided with two pieces and are located on the opposite sides of the safety side plates. The opposite sides of the two safety push plates abut against the inner side wall of the lock shell, and the safety side plates are provided with avoidance holes for avoiding the limit rod.

[0017] By adopting the above technical solution, when the main lock tongue retracts, the limiting rod will drive the safety tongue to retract by abutting against the inner wall of the avoidance hole.

[0018] Preferably, the width of the avoidance hole gradually decreases toward the direction in which the safety tongue pops out, and an inclined guide surface is provided in the middle of the inner wall of the larger end of the avoidance hole, and the inclined guide surface is inclined away from the clutch plate toward the direction in which the safety tongue pops out.

[0019] By adopting the above technical solution, an inclined guide surface is provided to slowly guide the transition of the contact position between the limit rod and the inner wall of the avoidance hole.

[0020] Preferably, the lock housing includes a lock base plate and an upper seat, the upper seat includes a lock top plate and two lock side plates located on both sides of the lock top plate and bent and extended toward the lock base plate, the upper seat is fixedly connected to the lock base plate through the two lock side plates, and a lock tongue rivet seat is installed on the side of the lock top plate facing the lock base plate, the lock tongue rivet seat includes a limiting top plate that is attached to the lock top plate and fixed by bolts, and limiting side plates bent from the upper and lower sides of the limiting top plate toward the lock base plate, the first lock tongue center bolt passes through the two limiting side plates The locking plate is provided with a starting sub-plate on the side of the starting plate facing away from the main locking plate, and the starting sub-plate includes a fitting section that is fitted with the starting plate, and an abutting section that forms an acute angle with the fitting section, and a cross switch is installed on the lock head bottom plate at a position corresponding to the fitting sub-plate, and the cross switch is provided with an oblique abutting surface that cooperates with the abutting section.

[0021] By adopting the above technical solution, the lock housing is formed by the lock base and the upper seat, and the lock tongue rivet seat, the main lock tongue, the start plate and other structures are installed. The lock tongue rivet seat restricts the position of the main lock tongue, so that the main lock tongue can only rotate relative to the first lock tongue center bolt. When the cross switch is rotated, the angle between the inclined contact surface of the cross switch and the start plate changes, which pushes the start plate, thereby driving the start plate to rotate and drive the main lock tongue to complete the unlocking action.

[0022] In a second aspect, the present application provides an escape lock, which adopts the following technical solution: An escape lock comprises a pressure rod assembly, a sealing seat, and the above-mentioned lock head assembly.

[0023] By adopting the above technical solution, it is achieved that when the escape lock is locked, it cannot be unlocked by pressing the main lock tongue, thereby preventing illegal personnel from circumventing the alarm and anti-theft system of the escape lock.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. When the escape lock is closed, the main lock tongue pops out and locks, and the safety tongue abuts against the sealing seat and is in a retracted state. At this time, the clutch plate is in a locked position that cooperates with the limit rod to limit the retraction of the main lock tongue. Therefore, the escape lock cannot be unlocked by pressing the main lock tongue; when the starting plate is pressed normally, the starting plate will push the clutch plate out of the locked position, so it will not affect the normal opening of the escape lock; when the door is in the open state, the safety tongue and the main lock tongue are both in the popped-out state, the safety tongue will push the clutch plate out of the locked position, so it will not affect the retraction of the main lock tongue when closing the door.

[0025] 2. When the main lock tongue is in the pop-up state and the safety tongue is in the retracted state, a gap is left between the limit rod and the clutch force surface so that when the start plate is pressed, the clutch force member can drive the clutch plate to lift up before the limit rod and the clutch plate abut against each other, which will not affect the normal door opening action; when the limit rod and the clutch force surface abut against each other, the force applied to the clutch force surface drives the clutch plate to rotate toward the safety push plate, so that in the locked state, when the main lock tongue is pressed, the limit rod will not drive the clutch plate to lift up, and therefore the door cannot be unlocked by pressing the main lock tongue. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 2. It is a structural diagram of an escape lock installed on a door in an embodiment; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 2 is a schematic structural diagram of the lock assembly in the embodiment; Figure 4 This is a schematic diagram of the structure of the lock assembly after it is hidden in the upper seat in the embodiment; Figure 5 Schematic diagram of the coordination structure of the start plate, cross switch and main lock tongue in the embodiment; Figure 6 This is a structural diagram of the lock head assembly after the upper seat, lock tongue rivet seat, and main lock tongue are hidden in the embodiment; Figure 7 This is a schematic diagram of the structure of the main lock tongue and the safety tongue in the embodiment; Figure 8 2 is a schematic structural diagram of the embodiment when the lock assembly is in a locked state; Figure 9 2 is a schematic structural diagram of the lock assembly in the embodiment when it is unlocked; Figure 10 2 is a schematic diagram of the structure of the retracted head assembly when it is restored after being unlocked in the embodiment.

[0027] Explanation of the accompanying symbols: 1. pressure rod assembly; 2. lock assembly; 3. sealing seat; 4. lower sleeve; 5. upper sleeve; 6. rear cover; 7. outer limiting ridge; 8. inner limiting ridge; 9. first movable limiting ridge; 10. second movable limiting ridge; 11. fixed limiting ridge; 12. lock housing; 13. bolt linkage mechanism; 14. anti-pry mechanism; 15. lock bottom plate; 16. upper seat; 17. lock top plate; 18. lock side plate; 19. starting plate; 20. main bolt; 21. starting sub-plate; 22. fitting section; 23. abutting section; 24. cross switch; 25. oblique abutting surface; 26. bolt rivet seat; 27. limiting top plate; 28. limiting side plate; 29. First lock tongue center bolt; 30. Locking part; 31. Hinge part; 32. First torsion spring; 33. Safety tongue; 34. Safety reset spring; 35. Clutch plate; 36. Second torsion spring; 37. Safety bottom plate; 38. Safety side plate; 39. Safety push plate; 40. Avoidance hole; 41. Inclined guide surface; 42. Guide hole; 43. Safety positioning bolt; 44. Limiting plate; 45. Fixed column; 46. First straight section; 47. Curved section; 48. Inclined section; 49. Second straight section; 50. Torsion spring slot; 51. Clutch protrusion; 52. Clutch slot; 53. Clutch force-bearing member; 54. Limiting rod; 55. Start plate center bolt; 56. Clutch force-bearing surface. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-10 This application is described in further detail.

[0029] The embodiments of the present application disclose an escape lock. The terms "up", "down", "left" and "right" used in the embodiments are schematic illustrations of relative directions of positional relationships and are not limitations of the positional relationships.

[0030] like Figure 1 and Figure 2As shown, the escape lock includes a lever assembly 1, a lock assembly 2, and a sealing seat 3. The lock assembly 2 is located at the end of the lever assembly 1 near the sealing seat 3. The locking action is achieved through the cooperation of the lock assembly 2 and the sealing seat 3. The lever assembly 1 includes a lower sleeve 4, an upper sleeve 5, and a rear cover 6. The lower sleeve 4 is U-shaped, with the open side of the lower sleeve 4 facing away from the door panel when installed. The inner walls of the lower sleeve 4 on both sides of the open side are formed with outer limiting ridges 7 and inner limiting ridges 8. The outer limiting ridge 7 is located on the side facing outward from the lower sleeve 4, and there is a gap between the outer limiting ridge 7 and the inner limiting ridge 8. The upper sleeve 5 is formed with first movable limiting ridges 9 on both the upper and lower side surfaces located inside the lower sleeve 4. The distance between the two first movable limiting ridges 9 on the opposite sides is greater than the distance between the two inner limiting ridges 8. Second movable stop ridges 10 are formed on both the upper and lower side surfaces of the upper sleeve 5 located outside the lower sleeve 4. The spacing between the two second movable stop ridges 10 on opposite sides is greater than the spacing between the two outer stop ridges 7. Through the cooperation between the first movable stop ridge 9 and the inner stop ridge 8, and the cooperation between the second movable stop ridge 10 and the outer stop ridge 7, the upper sleeve 5 can be clamped on the lower sleeve 4 and move in the inward and outward directions relative to the lower sleeve 4, but will not separate from the lower sleeve 4. The rear cover 6 is located at the end of the lower housing 4 away from the lock assembly 2. Fixed stop ridges 11 are formed on both sides of the rear cover 6. The spacing between the two facing surfaces of the fixed stop ridges 11 is greater than the spacing between the two inner stop ridges 8 and the spacing between the two outer stop ridges 7. The two fixed stop ridges 11 are located between the inner stop ridges 8 and the outer stop ridges 7. The thickness of the fixed stop ridges 11 is equal to the spacing between the inner stop ridges 8 and the outer stop ridges 7. This ensures that the rear cover 6 and the lower housing 4 are relatively fixed and cannot move relative to each other in the inward and outward directions. A sensor can be located within the lever assembly 1 or at another location where the lock assembly 2 is linked to the lever assembly 1 (not shown).

[0031] like Figure 3 As shown, the lock assembly 2 includes a lock housing 12, a deadbolt linkage mechanism 13 mounted on the lock housing 12, and an anti-pry mechanism 14. The lock housing 12 includes a lock base 15 and an upper seat 16. The upper seat 16 includes a lock top plate 17 and two lock side plates 18 located on either side of the lock top plate 17 and bent and extended toward the lock base 15. The upper seat 16 is fixedly connected to the lock base 15 via the two lock side plates 18 (bolts are omitted in some holes in the figure).

[0032] like Figure 4 and Figure 5As shown, the bolt linkage mechanism 13 includes a starter plate 19 and a main bolt 20, which are pivotally connected to the two lock side plates 18 of the upper seat 16. The main bolt 20 is pivotally connected to the upper seat 16 via a first bolt center bolt 29. The starter plate 19 is pivotally connected to the upper seat 16 via a starter plate center bolt 55. The starter plate 19 is located on the side near the pressure rod assembly 1, and its middle portion is pivotally connected to the upper seat 16. One end of the starter plate 19 abuts the end surface of the upper sleeve 5 facing the lower sleeve 4. The other end of the starter plate 19 is fixed to the side of the lock base 15. The starter plate 21 includes a bonding section 22 that is bonded to the starter plate 19 and an abutment section 23 that forms an acute angle with the bonding section 22. A cross switch 24 is mounted on the lock base 15 at a position corresponding to the starter plate 21. The cross switch 24 is formed with an inclined abutment surface 25 that mates with the abutment section 23. Rotating the cross switch 24 can push the starter plate 21. A bolt rivet seat 26 is mounted on the side of the lock head top plate 17 facing the lock head bottom plate 15. The bolt rivet seat 26 includes a limit top plate 27 that is attached to the lock head top plate 17 and fixed by bolts, and limit side plates 28 that bend from the upper and lower sides of the limit top plate 27 toward the lock head bottom plate 15. A first bolt center bolt 29 passes through the two limit side plates 28. The main bolt 20 includes an integrally formed locking portion 30 and a hinge portion 31. The first bolt center bolt 29 passes through the main bolt 20 at the position of the hinge portion 31. The height of the hinge portion 31 is equal to the distance between the two limit side plates 28. The bolt rivet seat 26 fixes the height position of the main bolt 20, allowing the main bolt 20 to rotate only relative to the first bolt center bolt 29. The height of the locking portion 30 is greater than that of the hinge portion 31. A first torsion spring 32 is installed on the first bolt center bolt 29, above the bolt rivet seat 26. One end of the first torsion spring 32 abuts the lock head top plate 17, and the other end abuts the side of the locking portion 30 facing away from the lock head top plate 17. The first torsion spring 32 drives the main bolt 20 in the direction of expansion. When the upper sleeve 5 is pressed, the hinge portion 31 is pushed by the activation plate 19, causing the main bolt 20 to retract. A downwardly extending limit rod 54 is formed on the end of the locking portion 30 of the main bolt 20 away from the hinge portion 31, near the direction of retraction of the main bolt 20.

[0033] like Figure 4 As shown, the anti-pry mechanism 14 includes a safety tongue 33, a safety return spring 34 for driving the safety tongue 33 to pop out, a clutch plate 35 for abutting the main lock tongue 20 when the safety tongue 33 is in a retracted state, and a second torsion spring 36 for driving the clutch plate 35 to rotate toward the safety tongue 33. Figures 6 to 8As shown, the safety tongue 33 includes a safety base plate 37 located between the main lock tongue 20 and the lock base plate 15, safety side plates 38 located on either side of the safety base plate 37 and extending upward and downward from the main lock tongue 20, and safety push plates 39 formed on opposite sides of the two safety push plates 38. The opposite sides of the two safety push plates 39 are in contact with the inner sidewalls of the lock side plates 18, allowing the safety tongue 33 to move only in the left and right directions. A clearance hole 40 for circumventing the limit rod 54 is defined in the safety side plate 38 located below the main lock tongue 20. The width of the clearance hole 40 gradually increases from the end away from the pressure rod assembly 1 toward the end near the pressure rod assembly 1. A slanted guide surface 41 is formed in the middle of the inner wall of the clearance hole 40 near the pressure rod assembly 1. The slanted guide surface 41 slopes from the lock base plate 15 toward the lock top plate 17 toward the side near the pressure rod assembly 1. The lower lock side plate 18 is formed with a guide hole 42 along the left and right directions ( Figure 3(As shown in the figure), a safety positioning pin 43 is formed on the lower safety push plate 39 and passes through a guide hole 42. The end of the safety positioning pin 43 extending from the guide hole 42 is connected to the safety return spring 34. A limit plate 44 is fixed to the lower side of the lock head side plate 18. The right end of the limit plate 44 is bent toward the main lock tongue 20. The limit plate 44 cooperates with the limit rod 54 to limit the maximum ejection distance of the main lock tongue 20. A fixing post 45 is fixed below the limit plate 44 to connect the end of the safety return spring 34 away from the safety positioning pin 43. The side of the safety push plate 39 facing the lock head top plate 17 includes, from left to right, a first straight section 46, a curved section 47, an inclined section 48, and a second straight section 49. Both the curved section 47 and the inclined section 48 are inclined from left to right toward the lock head bottom plate 15. The slope of the inclined section 48 is greater than that of the curved section 47, and the curved section 47 is an inwardly concave curve. The distance between the second straight section 49 and the lock head bottom plate 15 is greater than the distance between the axis of the limit rod 54 and the lock head bottom plate 15. One end of the clutch plate 35 is rotatably connected to the actuating plate center pin 55. A torsion spring retaining groove 50 is formed on the side of the clutch plate 35 facing the lock head top plate 17. The width of the torsion spring retaining groove 50 is greater than the diameter of the second torsion spring 36. When one end of the second torsion spring 36 is engaged in the torsion spring retaining groove 50, the clutch plate 35 exerts a force toward the safety push plate 39, thereby maintaining constant contact with the safety push plate 39. A clutch protrusion 51 is formed in the middle of the clutch plate 35, facing the safety push plate 39. A clutch groove 52 is formed on the lower side of the clutch plate 35, away from the center pin 55 of the actuating plate. A clutch force-bearing member 53 is formed on the upper side of the clutch plate 35, which abuts the side of the actuating plate 19 facing the lock head top plate 17. The clutch groove 52 has a clutch force-bearing surface 56 oriented in the direction of movement of the limit rod 54. When the limit rod 54 abuts the clutch force-bearing surface 56, the force applied to the clutch force-bearing surface 56 is directed toward the side of the actuating plate center pin 55 closer to the lock head bottom plate 15, thus preventing unlocking by pressing the main lock tongue 20. When the main lock tongue 20 is in the extended position and the safety tongue 33 is in the retracted position, a gap remains between the limit rod 54 and the clutch force-bearing surface 56.

[0034] Specific usage process: like Figure 8 As shown, when the escape lock is in the locked state, the main lock tongue 20 pops out and engages the sealing seat 3 to lock the door, while the safety tongue 33 abuts the sealing seat 3 and cannot pop out. Under the force of the second torsion spring 36, the clutch plate 35 rotates toward the safety tongue 33 to a locked position. At this time, the limit rod 54 is located in the clutch groove 52. The force exerted by the limit rod 54 on the abutment surface of the clutch groove 52 drives the clutch plate 35 toward the safety push plate 39, making it impossible to unlock the escape lock by pressing the main lock tongue 20.

[0035] like Figure 9As shown, when the pressure rod assembly 1 is pressed normally to open the escape lock, the pressure rod assembly 1 presses the starting plate 19. When the starting plate 19 rotates, it drives the clutch plate 35 to rotate away from the safety push plate 39 so that the limit rod 54 disengages from the clutch groove 52. Therefore, the main lock tongue 20 can retract under the push of the starting plate 19 without being blocked by the clutch plate 35.

[0036] like Figure 10 As shown, when the door is opened, since they are no longer restricted by the sealing seat 3, the main lock tongue 20 and the safety tongue 33 will pop out. At this time, the clutch plate 35 is pushed upward by the safety push plate 39, so that the clutch plate 35 will not reach the position where the clutch groove 52 cooperates with the limit rod 54. Therefore, in this state, the main lock tongue 20 and the safety tongue 33 can retract freely without affecting the closing of the door.

[0037] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A lock assembly with an anti-pry mechanism, comprising a lock housing (12), a lock tongue linkage mechanism (13) and an anti-pry mechanism (14), characterized in that: The lock housing (12) is used to install the lock tongue linkage mechanism (13) and the anti-pry mechanism (14); The lock tongue linkage mechanism (13) comprises a main lock tongue (20), a first elastic member for driving the main lock tongue (20) to pop outward, and a starting plate (19) for driving the lock tongue to retract when the pressure rod assembly (1) is subjected to force, and a limiting rod (54) is provided on the side of the main lock tongue (20); The anti-pry mechanism (14) comprises a safety tongue (33), a safety reset elastic member, a clutch plate (35) and a second elastic member. The safety reset elastic member is used to drive the safety tongue (33) to pop outward, the clutch plate (35) is rotatably connected to the lock housing (12), and the second elastic member drives the clutch plate (35) to rotate in the direction of the safety tongue (33). When the safety tongue (33) is in a retracted state, the clutch plate (35) is in a locked position that cooperates with the limit rod (54) to limit the retraction of the main lock tongue (20); when the safety tongue (33) pops out or the start plate (19) is pressed, the safety tongue (33) or the start plate (19) can push the clutch plate (35) out of the locked position.

2. The lock assembly with an anti-pry mechanism according to claim 1, wherein: The first elastic member is a first torsion spring (32), the second elastic member is a second torsion spring (36), and the safety reset elastic member is a safety reset spring (34).

3. The lock assembly with an anti-pry mechanism according to claim 1, wherein: The safety tongue (33) includes a safety push plate (39) for contacting the clutch plate (35), and the safety push plate (39) is provided with a slope section on the side facing the clutch plate (35), and the slope section is inclined toward the side away from the clutch plate (35) in the direction in which the safety tongue (33) pops out.

4. The lock assembly with an anti-pry mechanism according to claim 1, wherein: The safety tongue (33) includes a safety push plate (39) for contacting with the clutch plate (35); the safety push plate (39) is sequentially provided with a first straight section (46), a curved section (47), an inclined section (48), and a second straight section (49) on the side facing the clutch plate (35); the curved section (47) and the inclined section (48) are inclined in the direction in which the main lock tongue (20) pops out and away from the clutch plate (35); the inclination of the inclined section (48) is greater than the inclination of the curved section (47); the curved section (47) is an inwardly concave curve; and a clutch protrusion (51) is provided on the middle part of the clutch plate (35) facing the side of the safety push plate (39).

5. The lock assembly with an anti-pry mechanism according to claim 3 or 4, characterized in that: The main lock tongue (20) is rotatably connected to the lock housing (12) through the first lock tongue center bolt (29), and the starting plate (19) is rotatably connected to the lock housing (12) through the starting plate center bolt (55). The clutch plate (35) is provided with a clutch force-bearing member (53) that abuts against the starting plate (19) toward the main lock tongue (20). A clutch groove (52) is provided on the lower side of one end of the clutch plate (35) away from the starting plate center bolt (55). The clutch groove (52) is provided with a clutch force-bearing surface (56) in the movement direction of the limiting rod (54). When the limiting rod (54) abuts against the clutch force-bearing surface (56), the direction of the force applied to the clutch force-bearing surface (56) points to the direction of driving the clutch plate (35) to rotate toward the insurance push plate (39).

6. The lock assembly with an anti-pry mechanism according to claim 5, wherein: When the main lock tongue (20) is in the pop-up state and the safety tongue (33) is in the retracted state, a gap is left between the limit rod (54) and the clutch force surface (56). During the rotation process of the start plate (19), the start plate (19) contacts the clutch plate (35) earlier than the main lock tongue (20).

7. The lock assembly with an anti-pry mechanism according to claim 5, wherein: The safety tongue (33) comprises a safety bottom plate (37) located between the main lock tongue (20) and the lock head bottom plate (15), and safety side plates (38) located on both sides of the safety bottom plate (37) and extending in the upper and lower directions of the main lock tongue (20). The safety push plates (39) are provided with two pieces and are located on opposite sides of the safety side plates (38). The opposite sides of the two safety push plates (39) abut against the inner side wall of the lock head housing (12). The safety side plates (38) are provided with an avoidance hole (40) for avoiding the limit rod (54).

8. The lock assembly with an anti-pry mechanism according to claim 7, wherein: The width of the avoidance hole (40) gradually decreases in the direction in which the safety tongue (33) pops out, and an inclined guide surface (41) is provided in the middle of the inner wall of the larger end of the avoidance hole (40), and the inclined guide surface (41) is inclined away from the clutch plate (35) and in the direction in which the safety tongue (33) pops out.

9. The lock assembly with an anti-pry mechanism according to claim 5, wherein: The lock housing (12) includes a lock base plate (15) and an upper seat (16), wherein the upper seat (16) includes a lock top plate (17) and two lock side plates (18) located on both sides of the lock top plate (17) and bent and extended toward the lock base plate (15), wherein the upper seat (16) is fixedly connected to the lock base plate (15) through the two lock side plates (18), and a lock tongue rivet seat (26) is installed on the side of the lock top plate (17) facing the lock base plate (15), wherein the lock tongue rivet seat (26) includes a limit top plate (27) attached to the lock top plate (17) and fixed by bolts, and a limit side plate (28) bent from the upper and lower sides of the limit top plate (27) toward the lock base plate (15), wherein the first lock tongue center bolt (29) passes through the two limit side plates (28), and the main lock The tongue (20) is located between the two limiting side plates (28); the main lock tongue (20) includes a locking portion (30) and a hinge portion (31); the first lock tongue center bolt (29) passes through the main lock tongue (20) from the position of the hinge portion (31); the height of the hinge portion (31) is equal to the distance between the two limiting side plates (28); a start sub-plate (21) is provided on the side of the start plate (19) facing away from the main lock tongue (20); the start sub-plate (21) includes a fitting section (22) fitted with the start plate (19) and an abutting section (23) forming an acute angle with the fitting section (22); a cross switch (24) is installed on the lock head base plate (15) at a position corresponding to the start sub-plate (21); and the cross switch (24) is provided with an oblique abutting surface (25) matched with the abutting section (23).

10. An escape lock, characterized in that: It comprises a pressure rod assembly (1), a sealing seat (3), and a lock assembly (2) according to any one of claims 1 to 9.

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