A lock cylinder assembly with a pick-resistant mechanism and an escape lock using the same

Abstract

The application relates to the field of locks, in particular to a lock head assembly and an escape lock using the same. The lock head assembly comprises a lock head shell, a lock bolt linkage mechanism and a pick-resistant mechanism, characterized in that the lock head shell is used for mounting the lock bolt linkage mechanism and the pick-resistant mechanism; the lock bolt linkage mechanism comprises a main lock bolt, a first elastic piece for driving the main lock bolt to pop out, and a starting plate for driving the lock bolt to retract when the pressure rod assembly is stressed, and the side surface of the main lock bolt is provided with a limiting rod; the pick-resistant mechanism comprises a safety bolt, a safety bolt return elastic piece, a clutch plate and a second elastic piece, the safety bolt return elastic piece is used for driving the safety bolt 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 in the direction of the safety bolt; when the safety bolt is in a retracted state, the clutch plate is in a locking position matched with the limiting rod to limit the retraction of the main lock bolt; when the safety bolt pops out or the starting plate is stressed, the safety bolt 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, in particular to a lock head assembly with a pick-resistant mechanism and an escape lock using the same. BACKGROUND

[0002] The American standard pressure rod escape lock is a standard equipment for emergency exit in large supermarkets and retail places. Its core function needs to achieve single pressing of the internal personnel push rod to quickly unlock, ensuring life safety in fire and other scenarios. However, when used in supermarkets, there are cases of illegal personnel escaping single through the door installed with the escape lock. The current solution to this behavior is to set a sensor in the escape lock to issue an alarm when the escape lock is opened. Since the sensor can only be set in the pressure rod, illegal personnel still have the way to bypass the pressure rod to directly operate the lock tongue to unlock, for example, by inserting a hard card or a thin tool into the door gap to force the lock tongue to retract and unlock. This kind of operation completely avoids the pressure rod transmission structure, resulting in that the sensor does not detect the displacement of the pressure rod or the transmission structure and is in a silent state, resulting in the failure of the alarm and theft prevention system.

[0003] In view of the above technical problems, the applicant designs an escape lock which cannot be unlocked by pressing the lock tongue to retract in the locked state. SUMMARY

[0004] In order to avoid the way of illegal personnel bypassing the alarm and theft prevention system by pressing the lock tongue to retract and unlock, the present application provides a lock head assembly with a pick-resistant mechanism and an escape lock using the same.

[0005] In the first aspect, the present application provides a lock head assembly with a pick-resistant mechanism, which adopts the following technical scheme:

[0006] A lock head assembly with a pick-resistant mechanism, comprising a lock head shell, a lock tongue linkage mechanism and a pick-resistant mechanism, characterized in that,

[0007] The lock head shell is used to install the lock tongue linkage mechanism and the pick-resistant mechanism;

[0008] The lock tongue linkage mechanism comprises a main lock tongue, a first elastic member for driving the main lock tongue to pop out, and a start plate for driving the lock tongue to retract when the pressure rod assembly is stressed, and the side surface of the main lock tongue is provided with a limiting rod;

[0009] The pick-resistant mechanism comprises 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 out, the clutch plate is rotationally connected with the lock head shell, and the second elastic member drives the clutch plate to rotate in the direction of the safety tongue. When the safety tongue is in the retracted state, the clutch plate is in the locked position for limiting the retraction of the main lock tongue in cooperation with the limiting rod; when the safety tongue is popped out or the start plate is stressed, the safety tongue or the start plate can push the clutch plate away from the locked position.

[0010] By adopting the technical scheme, when the escape lock is closed, the main lock tongue is popped out to be locked, the safety tongue is in abutment with the sealing seat and is in a retracted state, at this time, the clutch plate is in a locking position of cooperating with the limiting rod to limit the retraction of the main lock tongue, so the escape lock cannot be unlocked by pressing the main lock tongue. When the starting plate is normally pressed, the starting plate pushes the clutch plate to be separated from the locking position, so the normal opening of the escape lock is not affected. When the door is in an open state, the safety tongue and the main lock tongue are both in a popped-out state, the safety tongue pushes the clutch plate to be separated from the locking position, so the retraction of the main lock tongue when the door is closed is not affected.

[0011] Preferably, the first elastic member is a first torsional spring, the second elastic member is a second torsional spring, and the safety reset elastic member is a safety reset spring.

[0012] Preferably, the safety tongue comprises a safety push plate for abutting against the clutch plate, and a slope section is arranged on the side of the safety push plate facing the clutch plate, and the slope section is inclined to the side away from the clutch plate in the direction of the safety tongue being popped out.

[0013] By adopting the technical scheme, the slope section inclined to the side away from the clutch plate in the direction of the safety tongue being popped out is arranged to gradually push the clutch plate to be separated from the locking position in the process of the safety tongue being popped out.

[0014] Preferably, the safety tongue comprises a safety push plate for abutting against the clutch plate, and a first straight section, a curved section, an inclined section and a second straight section are arranged on the side of the safety push plate facing the clutch plate in sequence, the curved section and the inclined section are inclined to the side away from the clutch plate in the direction of the safety tongue being popped out, the inclination of the inclined section is greater than that of the curved section, the curved section is an inner concave curve, and a clutch protrusion is arranged on the middle part of the clutch plate and faces the safety push plate.

[0015] By adopting the technical scheme, in the process of the safety push plate pushing the clutch plate, when the clutch protrusion reaches the position of the inclined section from the second straight section, the clutch plate is first lifted up to be separated from the locking position, and then is slowly lifted up through the position of the curved section until the first straight section.

[0016] Preferably, the main lock tongue is rotationally connected to the lock head shell through a first lock tongue center pin, the starting plate is rotationally connected to the lock head shell through a starting plate center pin, the clutch plate is provided with a clutch force receiving member for abutting against the side of the starting plate facing the main lock tongue, and a clutch groove is arranged on the lower side of the end of the clutch plate away from the starting plate center pin, the clutch groove is provided with a clutch force receiving surface in the movement direction of the limiting rod, and when the limiting rod abuts against the clutch force receiving surface, the direction of the force applied to the clutch force receiving surface by the limiting rod is directed to the direction of driving the clutch plate to rotate towards the safety push plate.

[0017] By adopting the technical scheme, when the limiting rod and the clutch stress surface abut, the force applied by the limiting rod to the clutch stress surface drives the clutch plate to rotate towards the safety push plate, and when the clutch plate and the safety push plate abut, the clutch plate cannot rotate, and the limiting rod cannot drive the clutch plate to move. Therefore, when the locking state is pressed, the limiting rod cannot drive the clutch plate to lift, and the main lock tongue cannot be unlocked by pressing the main lock tongue.

[0018] Preferably, when the main lock tongue is in the pop-up state and the safety tongue is in the retracted state, the limiting rod and the clutch stress surface have a gap, and the starting plate abuts the clutch plate earlier than the main lock tongue during rotation.

[0019] By adopting the technical scheme, when the main lock tongue is in the pop-up state and the safety tongue is in the retracted state, the limiting rod and the clutch stress surface have a gap, or the starting plate abuts the clutch plate earlier than the main lock tongue during rotation. When the starting plate is pressed, the clutch stress surface can drive the clutch plate to lift before the limiting rod and the clutch plate abut, and the normal door opening action is not affected.

[0020] Preferably, the safety tongue includes a safety bottom plate between the main lock tongue and the lock head bottom plate, safety side plates extending to the upper and lower sides of the main lock tongue on both sides of the safety bottom plate, and two safety push plates located on the side away from the safety side plates. The side away from the two safety push plates abuts the inner side wall of the lock head shell, and the safety side plate is provided with an avoidance hole for avoiding the limiting rod.

[0021] By adopting the technical scheme, when the main lock tongue is retracted, the limiting rod will abut the inner side wall of the avoidance hole to drive the safety tongue to retract.

[0022] Preferably, the avoidance hole gradually decreases in width in the direction of the safety tongue pop-up, and the inner wall of the larger end of the avoidance hole is provided with an inclined guide surface inclined away from the clutch plate in the direction of the safety tongue pop-up.

[0023] By adopting the technical scheme, the inclined guide surface is provided to slowly guide the transition of the contact position of the limiting rod and the inner wall of the avoidance hole.

[0024] Preferably, the lock head shell comprises a lock head bottom plate and an upper seat, the upper seat comprises a lock head top plate and two lock head side plates which are bent and extended to the lock head bottom plate on both sides of the lock head top plate, the upper seat is fixedly connected with the lock head bottom plate through the two lock head side plates, a lock tongue riveting seat is arranged on the side of the lock head top plate facing the lock head bottom plate, the lock tongue riveting seat comprises a limiting top plate which is attached to the lock head top plate and fixed through bolts, and limiting side plates which are bent from the upper and lower sides of the limiting top plate to the lock head bottom plate, the first lock tongue center pin passes through the two limiting side plates, and the main lock tongue is located between the two limiting side plates; the main lock tongue comprises a locking part and a hinged part, the first lock tongue center pin passes through the main lock tongue from the position of the hinged part, and the height of the hinged part is equal to the spacing between the two limiting side plates; the side of the starting plate away from the main lock tongue is provided with a starting secondary plate, the starting secondary plate comprises an attachment segment which is attached to the starting plate, and an abutting segment which is at an acute angle with the attachment segment, and a cross switch is arranged on the lock head bottom plate at a position corresponding to the starting secondary plate, and an inclined abutting surface which cooperates with the abutting segment is arranged on the cross switch.

[0025] By adopting the above technical scheme, the lock head shell composed of the lock head bottom plate and the upper seat is used to install the lock tongue riveting seat, the main lock tongue and the starting plate, the lock tongue riveting seat is used to limit the position of the main lock tongue, so that the main lock tongue can only rotate relative to the first lock tongue center pin. When the cross switch is rotated, the angle between the inclined abutting surface of the cross switch and the starting secondary plate changes, so that the starting secondary plate is pushed, and the starting plate is rotated to drive the main lock tongue to complete the unlocking action.

[0026] In the second aspect, the application provides an escape lock, which adopts the following technical scheme:

[0027] An escape lock comprises a pressure rod assembly, a sealing seat and the lock head assembly.

[0028] By adopting the above technical scheme, the escape lock cannot be unlocked by pressing the main lock tongue when the lock is closed, so that the alarm anti-theft system of the escape lock is avoided to be bypassed by illegal personnel.

[0029] In summary, the application has at least one of the following beneficial technical effects:

[0030] 1. When the escape lock is closed, the main lock tongue is popped out to be locked, the safety tongue is in a retracted state at the abutting position of the sealing seat, at this time, the disengaging plate is in a locking position for cooperating with the limiting rod to limit the retraction of the main lock tongue, so that the escape lock cannot be unlocked by pressing the main lock tongue; when the starting plate is normally pressed, the starting plate pushes the disengaging plate to be separated from the locking position, so that the normal opening of the escape lock is not affected; when the door is in an open state, the safety tongue and the main lock tongue are both in a popped-out state, the safety tongue pushes the disengaging plate to be separated from the locking position, so that the retraction of the main lock tongue when the door is closed is not affected.

[0031] 2. When the main lock tongue is in the pop-up state and the safety tongue is in the retracted state, the spacing between the limiting rod and the clutch stress surface allows the starting plate to be pressed and the clutch plate to be lifted before the limiting rod and the clutch plate are in contact, which does not affect the normal door opening action; When the limiting rod and the clutch stress surface are in contact, the force applied to the clutch stress surface drives the clutch plate to rotate in the direction of the safety push plate, so that in the locked state, the limiting rod cannot lift the clutch plate when the main lock tongue is pressed, and therefore the main lock tongue cannot be unlocked by pressing. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structure diagram of the escape lock of the embodiment installed on the door;

[0033] Figure 2 is Figure 1 is an enlarged view of A in

[0034] Figure 3 is a structure diagram of the lock head assembly in the embodiment;

[0035] Figure 4 is a structure diagram of the lock head assembly in the embodiment after hiding the upper seat;

[0036] Figure 5 is a structure diagram of the cooperation of the starting plate, the cross switch and the main lock tongue in the embodiment;

[0037] Figure 6 is a structure diagram of the lock head assembly in the embodiment after hiding the upper seat, the lock tongue rivet seat and the main lock tongue;

[0038] Figure 7 is a structure diagram of the cooperation of the main lock tongue and the safety tongue in the embodiment;

[0039] Figure 8 is a structure diagram of the lock head assembly in the embodiment in the locked state;

[0040] Figure 9 is a structure diagram of the lock head assembly in the embodiment in the unlocked state;

[0041] Figure 10 is a structure diagram of the lock head assembly in the embodiment after unlocking and returning;

[0042] Explanation of reference signs: 1, pressure rod assembly; 2, lock head assembly; 3, sealing seat; 4, lower sleeve; 5, upper sleeve; 6, rear cover plate; 7, outer limiting convex strip; 8, inner limiting convex strip; 9, first movable limiting convex strip; 10, second movable limiting convex strip; 11, fixed limiting convex strip; 12, lock head shell; 13, lock tongue linkage mechanism; 14, anti-prying mechanism; 15, lock head bottom plate; 16, upper seat; 17, lock head top plate; 18, lock head side plate; 19, starting plate; 20, main lock tongue; 21, starting vice plate; 22, abutting section; 23, abutting section; 24, cross switch; 25, inclined abutting surface; 26, lock tongue riveting seat; 27, limiting top plate; 28, limiting side plate; 29, first lock tongue center pin; 30, locking part; 31, hinged 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, avoiding hole; 41, inclined guide surface; 42, guide hole; 43, safety positioning pin; 44, limiting plate; 45, fixed column; 46, first straight section; 47, curved section; 48, inclined section; 49, second straight section; 50, torsion spring clamping groove; 51, clutch protrusion; 52, clutch groove; 53, clutch force receiving member; 54, limiting rod; 55, starting plate center pin; 56, clutch force receiving surface. DETAILED DESCRIPTION

[0043] The following will be described in detail in combination with the accompanying drawings. Figures 1-10 The present application is further described in detail.

[0044] The "upper", "lower", "left", "right" used in the embodiments of the present application are relative directions for describing position relationship, and are not limited by the position relationship.

[0045] As Figure 1 and Figure 2As shown, the escape lock comprises a pressure rod assembly 1, a lock head assembly 2 and a sealing seat 3, the lock head assembly 2 is located at one end of the pressure rod assembly 1 close to the sealing seat 3, and the locking action is completed by cooperation of the lock head assembly 2 and the sealing seat 3. The pressure rod assembly 1 comprises a lower sleeve 4, an upper sleeve 5 and a rear cover plate 6. The lower sleeve 4 is U-shaped, and the opening side of the lower sleeve 4 faces away from the door plate during installation. Outer limiting protrusions 7 and inner limiting protrusions 8 are formed on the inner walls of both sides of the opening side of the lower sleeve 4. The outer limiting protrusions 7 are located on the side facing out of the lower sleeve 4, and there is a space between the outer limiting protrusions 7 and the inner limiting protrusions 8. The upper sleeve 5 is located on both upper and lower sides of one side of the lower sleeve 4, and first movable limiting protrusions 9 are formed on the upper and lower sides. The distance between the two first movable limiting protrusions 9 is greater than the distance between the two inner limiting protrusions 8. The upper sleeve 5 is located on both upper and lower sides of the other side of the lower sleeve 4, and second movable limiting protrusions 10 are formed on the upper and lower sides. The distance between the two second movable limiting protrusions 10 is greater than the distance between the two outer limiting protrusions 7. Through cooperation of the first movable limiting protrusions 9 and the inner limiting protrusions 8, and cooperation of the second movable limiting protrusions 10 and the outer limiting protrusions 7, the upper sleeve 5 can be clamped on the lower sleeve 4 and move in the inner-outer direction relative to the lower sleeve 4, but will not be separated from the lower sleeve 4. The rear cover plate 6 is located at the end of the lower sleeve 4 away from the lock head assembly 2. Fixed limiting protrusions 11 are formed on both sides of the rear cover plate 6. The distance between the two fixed limiting protrusions 11 is greater than the distance between the two inner limiting protrusions 8 and the distance between the two outer limiting protrusions 7. The two fixed limiting protrusions 11 are located between the inner limiting protrusions 8 and the outer limiting protrusions 7, and the thickness of the fixed limiting protrusions 11 is equal to the distance between the inner limiting protrusions 8 and the outer limiting protrusions 7, so that the positions of the rear cover plate 6 and the lower sleeve 4 are relatively fixed and cannot move in the inner-outer direction. The sensor can be arranged in the pressure rod assembly 1 or other positions linked with the pressure rod assembly 1 (not shown in the figure).

[0046] As shown in Figure 3 , the lock head assembly 2 comprises a lock head shell 12, a lock bolt linkage mechanism 13 and a anti-prying mechanism 14 installed on the lock head shell 12. The lock head shell 12 comprises a lock head bottom plate 15 and an upper seat 16. The upper seat 16 comprises a lock head top plate 17 and two lock head side plates 18 extending and formed in the direction of the lock head bottom plate 15 on both sides of the lock head top plate 17. The upper seat 16 is fixedly connected with the lock head bottom plate 15 through the two lock head side plates 18 (some hole positions are omitted, and the bolts are not shown in the figure).

[0047] As shown in Figure 4 and Figure 5As shown, the lock bolt linkage mechanism 13 comprises an activation plate 19 and a main lock bolt 20 rotatably connected with two lock head side plates 18 of the upper seat 16, the main lock bolt 20 is rotatably connected with the upper seat 16 through a first lock bolt center pin 29, and the activation plate 19 is rotatably connected with the upper seat 16 through an activation plate center pin 55. The activation plate 19 is located on the side close to the compression rod assembly 1, and the middle part is rotatably connected with the upper seat 16, one end of the activation plate 19 abuts against the end face of the side of the upper sleeve 5 facing the lower sleeve 4, and the other end of the activation plate 19 is fixed with an activation secondary plate 21 on the side of the lock head bottom plate 15 facing the lock head bottom plate 15. The activation secondary plate 21 comprises a lamination section 22 connected with the activation plate 19, and an abutting section 23 at an acute angle with the lamination section 22. A cross switch 24 is installed on the lock head bottom plate 15 corresponding to the position of the activation secondary plate 21, and the cross switch 24 is formed with an inclined abutting surface 25 matched with the abutting section 23, and rotating the cross switch 24 can push the activation secondary plate 21 through the cross switch 24. The lock head top plate 17 is installed with a lock bolt rivet seat 26 on the side facing the lock head bottom plate 15, the lock bolt rivet seat 26 comprises a limiting top plate 27 abutting with the lock head top plate 17 and fixed by bolts, and limiting side plates 28 bent from the upper and lower sides of the limiting top plate 27 to the lock head bottom plate 15, and the first lock bolt center pin 29 penetrates through the two limiting side plates 28. The main lock bolt 20 comprises an integrated locking part 30 and a hinged part 31, the first lock bolt center pin 29 penetrates through the main lock bolt 20 from the position of the hinged part 31, the height of the hinged part 31 is equal to the spacing between the two limiting side plates 28, and the height position of the main lock bolt 20 is fixed through the lock bolt rivet seat 26, so that the main lock bolt 20 can only rotate relative to the first lock bolt center pin 29. The height of the locking part 30 is greater than the height of the hinged part 31, a first torsion spring 32 is arranged on the first lock bolt center pin 29 above the lock bolt rivet seat 26, one end of the first torsion spring 32 abuts against the lock head top plate 17, and the other end abuts against the side of the locking part 30 away from the lock head top plate 17, and the first torsion spring 32 drives the main lock bolt 20 to move in the direction of ejection. When pressing the upper sleeve 5, the hinged part 31 is pushed by the activation plate 19, so that the main lock bolt 20 moves in the direction of retraction. A limiting rod 54 extending downward is formed on the end of the locking part 30 of the main lock bolt 20 away from the hinged part 31 and close to the retraction direction of the main lock bolt 20.

[0048] As Figure 4 shown, the anti-picking mechanism 14 comprises a security tongue 33, an insurance reset spring 34 for driving the security tongue 33 to eject, a clutch plate 35 for abutting against the main lock bolt 20 when the security tongue 33 is in the retracted state, and a second torsion spring 36 for driving the clutch plate 35 to rotate towards the security tongue 33. As Figures 6 to 8As shown, the safety tongue 33 comprises a safety bottom plate 37 between the main lock tongue 20 and the lock head bottom plate 15, safety side plates 38 extending to the upper and lower sides of the main lock tongue 20 on both sides of the safety bottom plate 37, and safety push plates 39 formed on the side away from the safety side plates 38, the side away from the safety side plates 39 being fitted with the inner side wall of the lock head side plate 18 so that the safety tongue 33 can only move in the left and right directions. The safety side plate 38 below the main lock tongue 20 is provided with an avoidance hole 40 for avoiding the limiting rod 54, the avoidance hole 40 gradually increasing in width from the end away from the pressure rod assembly 1 to the end close to the pressure rod assembly 1, and the inner wall of the avoidance hole 40 close to the pressure rod assembly 1 being provided with a middle part of a beveled surface 41 inclined from the lock head bottom plate 15 to the lock head top plate 17 towards the side close to the pressure rod assembly 1. The lower lock head side plate 18 is provided with a guide hole 42 in the left and right directions Figure 3As shown in the diagram, a safety positioning bolt 43 is formed on the lower safety push plate 39, passing through the guide hole 42. One end of the safety positioning bolt 43 extending out of the guide hole 42 is connected to the safety return spring 34. A limit plate 44 is fixed to the lower side of the lower lock head side plate 18. The right end of the limit plate 44 is bent towards the main lock tongue 20, so that the maximum ejection distance of the main lock tongue 20 can be limited by the limit plate 44 in conjunction with the limit rod 54. 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 bolt 43. 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 towards the lock head bottom plate 15. The inclination of the inclined section 48 is greater than that of the curved section 47, and the curved section 47 is a 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 center bolt 55 of the starter plate. A torsion spring 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 groove 50 is greater than the diameter of the second torsion spring 36, causing one end of the second torsion spring 36 to engage in the torsion spring groove 50, applying a force to the clutch plate 35 in the direction of the safety push plate 39, ensuring that the clutch plate 35 always abuts against 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 bolt 55 of the actuating plate. A clutch force-bearing member 53 is formed on the upper side of the clutch plate 35, which abuts against the actuating plate 19 facing the top plate 17 of the lock head. The clutch groove 52 has a clutch force-bearing surface 56 in the direction of movement of the limit rod 54. When the limit rod 54 abuts against the clutch force-bearing surface 56, the force applied to the clutch force-bearing surface 56 is directed towards the side of the center bolt 55 of the actuating plate near the bottom plate 15 of the lock head, so it cannot be unlocked by pressing the main bolt 20. When the main bolt 20 is in the pop-out state and the safety bolt 33 is in the retracted state, there is a gap between the limit rod 54 and the clutch force-bearing surface 56.

[0049] Specific usage process:

[0050] like Figure 8 As shown, when the escape lock is in the locked state, the main bolt 20 extends and engages with the sealing seat 3 to lock the door, while the safety bolt 33 remains abutting against the sealing seat 3 and cannot extend. Under the force of the second torsion spring 36, the clutch plate 35 rotates the safety bolt 33 to the locked position, at which point the limiting rod 54 is located within the clutch groove 52. The limiting rod 54, through the force exerted on its contact surface with the clutch groove 52, drives the clutch plate 35 to move towards the safety push plate 39, thus preventing the escape lock from being unlocked by pressing the main bolt 20.

[0051] like Figure 9As shown, when the escape lock is opened by pressing the lever assembly 1 normally, the lever assembly 1 presses the start plate 19. When the start plate 19 rotates, it drives the clutch plate 35 to rotate away from the safety push plate 39, causing the limit rod 54 to disengage from the clutch groove 52. Therefore, the main lock tongue 20 can retract under the push of the start plate 19 without being blocked by the clutch plate 35.

[0052] like Figure 10 As shown, when the door is opened, since it is 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 of the clutch groove 52 and 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.

[0053] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lock cylinder assembly with anti-picking mechanism, comprising a lock cylinder housing (12), a bolt linkage mechanism (13) and an anti-picking mechanism (14), characterized in that, the lock cylinder housing (12) is used for mounting the bolt linkage mechanism (13) and the anti-picking mechanism (14); the bolt linkage mechanism (13) comprises a main bolt (20), a first elastic member for driving the main bolt (20) to pop out, and a starting plate (19) for driving the bolt to retract when the pressure bar assembly (1) is stressed, the side surface of the main bolt (20) is provided with a limiting rod (54); the anti-picking mechanism (14) comprises a security bolt (33), a security reset elastic member, a clutch plate (35) and a second elastic member, the security reset elastic member is used for driving the security bolt (33) to pop out, the clutch plate (35) is rotationally connected with the lock cylinder housing (12), the second elastic member drives the clutch plate (35) to rotate towards the security bolt (33), when the security bolt (33) is in the retracted state, the clutch plate (35) is in the locked position for limiting the retraction of the main bolt (20) by cooperating with the limiting rod (54); when the security bolt (33) is popped out or the starting plate (19) is stressed, the security bolt (33) or the starting plate (19) can push the clutch plate (35) away from the locked position; the limiting rod (54) cooperates with the clutch stress surface (56) of the clutch plate (35), when the limiting rod (54) abuts against the clutch stress surface (56), the direction of the force applied to the clutch stress surface (56) is directed to the direction for driving the clutch plate (35) to rotate towards the security bolt (33).

2. The lock cylinder assembly with anti-pick mechanism according to claim 1, wherein, the first elastic member is a first torsional spring (32), the second elastic member is a second torsional spring (36), and the security reset elastic member is a security reset spring (34).

3. The lock cylinder assembly with anti-pick mechanism according to claim 1, wherein, the security bolt (33) comprises a security push plate (39) for abutting against the clutch plate (35), the security push plate (39) is provided with a slope section on the side facing the clutch plate (35), the slope section is inclined to the side away from the clutch plate (35) in the direction of the security bolt (33) popping out.

4. The lock cylinder assembly with anti-pick mechanism according to claim 1, wherein, the security bolt (33) comprises a security push plate (39) for abutting against the clutch plate (35), the security push plate (39) is provided with a first flat section (46), a curved section (47), an inclined section (48) and a second flat section (49) in sequence on the side facing the clutch plate (35), the curved section (47) and the inclined section (48) are inclined to the side away from the clutch plate (35) in the direction of the main bolt (20) popping out, the inclination of the inclined section (48) is greater than that of the curved section (47), the curved section (47) is a concave curve, and the middle part of the clutch plate (35) is provided with a clutch protrusion (51) on the side facing the security push plate (39).

5. The lock assembly with anti-pry mechanism according to claim 3 or 4, characterized in that, The main lock tongue (20) is rotatably connected with the lock head shell (12) through a first lock tongue center pin (29), the starting plate (19) is rotatably connected with the lock head shell (12) through a starting plate center pin (55), the clutch plate (35) is provided with a clutch stress receiving part (53) abutting against the side of the starting plate (19) facing the main lock tongue (20), the lower side of the end of the clutch plate (35) away from the starting plate center pin (55) is provided with a clutch groove (52), and the clutch stress receiving surface (56) is arranged on the clutch groove (52) in the movement direction of the limiting rod (54).

6. The lock cylinder assembly of claim 5 wherein, When the main lock tongue (20) is in the pop-out state and the safety tongue (33) is in the retracted state, a space is left between the limiting rod (54) and the clutch stress receiving surface (56) / the starting plate (19) abuts against the clutch plate (35) earlier than the main lock tongue (20) during rotation.

7. The lock cylinder assembly of claim 5 wherein, The safety tongue (33) comprises a safety bottom plate (37) between the main lock tongue (20) and the lock head bottom plate (15), safety side plates (38) extending to the upper and lower sides of the main lock tongue (20) on both sides of the safety bottom plate (37), and two safety push plates (39) arranged on the sides of the safety side plates (38) away from each other, the sides of the two safety push plates (39) away from each other abutting against the inner side wall of the lock head shell (12), and the safety side plates (38) are provided with avoiding holes (40) avoiding the limiting rod (54).

8. The lock cylinder assembly with anti-pick mechanism according to claim 7, wherein, The avoiding hole (40) gradually decreases in width in the direction of the safety tongue (33) pop-out, and the inner wall of the larger end of the avoiding hole (40) is provided with a slanting guide surface (41) inclined to the direction of the safety tongue (33) pop-out away from the clutch plate (35).

9. The lock cylinder assembly with anti-pick mechanism according to claim 5, wherein, The lock head shell (12) comprises a lock head bottom plate (15) and an upper seat (16), the upper seat (16) comprises a lock head top plate (17) and two lock head side plates (18) which are bent and extended to the lock head bottom plate (15) on both sides of the lock head top plate (17), the upper seat (16) is fixedly connected with the lock head bottom plate (15) through the two lock head side plates (18), the lock head top plate (17) is provided with a lock tongue riveting seat (26) on the side facing the lock head bottom plate (15), the lock tongue riveting seat (26) comprises a limiting top plate (27) which is attached to the lock head top plate (17) and fixed through bolts and limiting side plates (28) which are bent from the upper and lower sides of the limiting top plate (27) to the lock head bottom plate (15), the first lock tongue center pin (29) passes through the two limiting side plates (28), and the main lock tongue (20) is located between the two limiting side plates (28); the main lock tongue (20) comprises a locking part (30) and a hinged part (31), the first lock tongue center pin (29) passes through the main lock tongue (20) from the position of the hinged part (31), the height of the hinged part (31) is equal to the spacing between the two limiting side plates (28), the starting plate (19) is provided with a starting sub-plate (21) on the side away from the main lock tongue (20), the starting sub-plate (21) comprises an attached segment (22) which is attached to the starting plate (19) and an abutting segment (23) which forms an acute angle with the attached segment (22), the lock head bottom plate (15) is provided with a cross switch (24) at the position corresponding to the starting sub-plate (21), and the cross switch (24) is provided with an inclined abutting surface (25) which cooperates with the abutting segment (23).

10. An escape lock characterised in that, The lock head assembly (2) comprises a pressing rod assembly (1), a sealing seat (3), and the lock head assembly (2) of any one of claims 1-9.

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