Lock body capable of preventing bolt from being inserted

Abstract

The utility model discloses a bolt insertion prevention lock body which comprises a lock shell, a lock cylinder, a handle shaft, a main lock bolt assembly, an inclined bolt assembly and a transmission assembly, an inclined bolt locking mechanism is further assembled in the lock shell, and the inclined bolt locking mechanism comprises a locking piece and a touch bolt assembly; the locking piece comprises a hinge seat, a locking arm and a trigger arm, wherein the locking arm and the trigger arm are arranged on the two sides of the hinge seat respectively. A torsional spring enabling the locking piece to be kept at a locking position is assembled on the positioning column. The touch tongue assembly comprises a touch tongue and a first supporting rod, a tongue hole allowing the touch tongue to stretch out is formed in the lock shell, an abutting arm is arranged at the bottom end of the first supporting rod, when the touch tongue is located at the stretching-out position, the abutting arm abuts against the trigger arm, the locking piece is kept at the releasing position, and when the touch tongue makes contact with the door frame and retracts, the abutting arm relieves limitation on the trigger arm. And the locking piece swings to a locking position under the action of the torsion spring. According to the utility model, the latch bolt locking mechanism is arranged, and the mechanical linkage is optimized, so that the anti-prying function with low cost and high reliability is realized.

Description

Technical Field

[0001] This utility model belongs to the field of lock technology, specifically relating to an anti-jamming lock body. Background Technology

[0002] Traditional lock bodies generally include a lock cylinder, handle shaft, main bolt assembly, latch bolt assembly, and transmission assembly. The lock cylinder and handle shaft drive the main bolt assembly and latch bolt assembly through the transmission assembly to complete the locking and unlocking actions. When only the latch bolt is in the locked position, some criminals can use hard cards to insert through the door gap and move the latch bolt from the locked position to the unlocked position to illegally open the door. Therefore, the security of traditional locks needs to be strengthened. Summary of the Invention

[0003] This utility model addresses the issue of insufficient security in traditional locks by providing an anti-slip lock body. Through optimized lock body structure, it effectively prevents cards from being inserted into the oblique latch for unlocking. The objective of this utility model is achieved through the following technical solution:

[0004] A lock body with anti-jamming mechanism includes a lock shell, within which a lock cylinder, a handle shaft, a main bolt assembly, a latch bolt assembly, and a transmission assembly are disposed. The lock shell also houses a latch bolt locking mechanism, which includes a locking element and a trigger bolt assembly. The locking element includes a hinge base and locking arms and trigger arms respectively disposed on both sides of the hinge base. The hinge base is hinged to the lock shell via a positioning pin. The locking element can reciprocate between a locked position and a released position. The positioning pin is equipped with a mechanism to keep the locking element in the locked position. The torsion spring is used to stop the movement; the latch assembly includes a latch and a first support rod fixed below the latch. The lock housing has a latch hole for the latch to extend. A spring is fitted on the first support rod to keep the latch in the extended position. The bottom end of the first support rod has a stop arm. When the latch is in the extended position, the stop arm abuts against the trigger arm to keep the locking member in the released position. When the latch contacts the door frame and retracts, the stop arm releases the restriction on the trigger arm, and the locking member swings to the locked position under the action of the torsion spring.

[0005] Preferably, the latch assembly includes a latch and a second support rod fixed below the latch. The locking member is assembled between the second support rod and the first support rod. When the locking member is in the released position, the locking arm avoids the retraction path of the latch and the latch. When the locking member is in the locked position, the locking arm blocks the retraction path of the latch.

[0006] Preferably, the abutting arm and the triggering arm are bent towards each other; when the contact tongue is in the extended position, the first support rod is in the initial position, and the abutting arm abuts against the triggering arm, restricting the swing of the locking member; when the contact tongue retracts, the first support rod moves down, the abutting arm makes way for the triggering arm, and the restriction on the locking member is released.

[0007] Preferably, the transmission assembly includes a toothed plate assembly for controlling the main latch assembly and a push plate assembly for controlling the latch assembly; the main latch assembly includes a latch and a support plate fixed to the bottom of the latch.

[0008] Preferably, the toothed plate assembly includes a first toothed plate that is linked to the lock cylinder, a second toothed plate that is linked to the handle shaft, a third toothed plate that meshes with the first toothed plate, and a fourth toothed plate that meshes with the second toothed plate; both the third toothed plate and the fourth toothed plate are provided with a linkage structure that is linked to the support plate.

[0009] Preferably, the push plate assembly includes a linkage push plate that can be linked with the lock cylinder, and a shift fork that can be linked with the handle shaft. The shift fork includes a shift wheel fitted on the handle shaft, and a first fork arm and a second fork arm protruding on the outer circumferential surface of the shift wheel. One end of the linkage push plate is provided with a push block that cooperates with the lock cylinder, and the other end of the linkage push plate is hinged to the first fork arm. The bottom end of the second support rod is fixed with a pull plate that cooperates with the second fork arm.

[0010] Preferably, an unlocking paddle is also formed on the outer circumferential surface of the dial. When the dial fork rotates to perform the unlocking action, the unlocking paddle can push against the trigger arm, causing the locking member to swing from the locked position to the released position and remain in the released position.

[0011] Preferably, the unlocking lever is a fan-shaped lever located between the first fork arm and the second fork arm.

[0012] Preferably, the lower end of the trigger arm has a linkage section that cooperates with the unlocking lever. The length of the outer arc edge of the unlocking lever is greater than the length of the linkage section. During the rotation of the unlocking lever, the front section of its outer arc edge cooperates with the linkage section to swing the locking member from the locked position to the released position, and the rear section of its outer arc edge cooperates with the linkage section to keep the locking member in the released position.

[0013] This invention offers the following technical advantages over existing technologies: By incorporating a latching mechanism, the security of the lock body is effectively improved. When the door is closed, the latch retracts under pressure from the door frame, causing the stop arm to disengage from the trigger arm. The locking element swings to the locking position under the action of a torsion spring, and the locking arm directly blocks the retraction path of the latch. Even if a criminal inserts a hard card through the door gap to manipulate the latch, the latch cannot retract due to the physical obstruction of the locking arm, thus preventing the possibility of unlocking by inserting the latch. During normal unlocking, automatic unlocking is achieved. When operated with a key or handle, the unlocking lever in the transmission assembly pushes the trigger arm, forcing the locking element to swing to the release position, releasing the obstruction of the latch and ensuring smooth legal unlocking. The lock automatically engages when the door is closed and automatically disengages when the door is opened, requiring no additional operation from the user, thus balancing safety and convenience. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the inclined tongue locking mechanism (the locking element is in the release position);

[0016] Figure 3 This is a schematic diagram of the inclined tongue locking mechanism (the locking element is located in the locking position);

[0017] Figure 4 This is a schematic diagram of the structure of this utility model when it is normally unlocked;

[0018] Figure 5 This is a schematic diagram showing the cooperation between the fork and the locking mechanism during normal unlocking of this utility model;

[0019] Figure 6 This is a schematic diagram of the shift fork and locking mechanism in this utility model;

[0020] The following markings are used in the diagram: Lock case 10; Handle shaft 20; Lock cylinder 30; Locking component 40; Locking arm 41; Trigger arm 42; Lug 51; First support rod 42; Abutment arm 43; Slant bolt 61; Second support rod 62; Pull plate 63; First toothed plate 71; Second toothed plate 72; Third toothed plate 73; Fourth toothed plate 74; Lock tongue 81; Support plate 82; Linkage push plate 91; Fork 92; First fork arm 921; Second fork arm 922; Unlocking lever 923. Detailed Implementation

[0021] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0022] See Figures 1-3 This embodiment discloses an anti-tamper lock body, including a lock shell 10, and the lock shell 10 contains a lock cylinder 30, a handle shaft 20, a main lock tongue assembly, a slanted tongue assembly and a transmission assembly.

[0023] The lock housing 10 is also equipped with a latch 61 locking mechanism, which includes a locking member 40 and a latch 51 assembly. The locking member 40 includes a hinge base, and locking arms 41 and trigger arms 42 respectively disposed on both sides of the hinge base. The hinge base is hinged to the lock housing 10 through a positioning pin. The locking member 40 can reciprocate between the locked position and the released position. A torsion spring is mounted on the positioning pin to keep the locking member 40 in the locked position. The latch 51 assembly includes a latch 51 and a latch 51 fixed to the latch 51. The first support rod 42 below is provided with a tongue hole on the lock housing 10 for the tongue 51 to extend. A spring is fitted on the first support rod 42 to keep the tongue 51 in the extended position. A stop arm 43 is provided at the bottom end of the first support rod 42. When the tongue 51 is in the extended position, the stop arm 43 abuts against the trigger arm 42, keeping the locking member 40 in the released position. When the tongue 51 contacts the door frame and retracts, the stop arm 43 releases the restriction on the trigger arm 42, and the locking member 40 swings to the locked position under the action of the torsion spring.

[0024] See Figure 2 , Figure 3 The oblique tongue assembly includes an oblique tongue 61 and a second support rod 62 fixed below the oblique tongue 61. The locking member 40 is assembled between the second support rod 62 and the first support rod 42. When the locking member 40 is in the released position, the locking arm 41 avoids the retraction path of the contact tongue 51 and the oblique tongue 61. When the locking member 40 is in the locked position, the locking arm 41 blocks the retraction path of the oblique tongue 61. The abutting arm 43 and the triggering arm 42 are bent towards each other. The bending structure of the two increases the contact area, reduces the risk of failure due to friction or displacement, and ensures the accuracy of the abutting and releasing actions.

[0025] When the latch 51 is in the extended position, the first support rod 42 is in the initial position, and the abutment arm 43 abuts against the trigger arm 42, restricting the swing of the locking member 40. When the latch 51 retracts, the first support rod 42 moves down, and the abutment arm 43 makes way for the trigger arm 42, releasing the restriction on the locking member 40. By setting the latch 61 locking mechanism, the security of the lock body can be effectively improved. When the door is open, the latch 51 is in the extended position, and the locking member 40 is in the released position, which does not affect the normal extension and retraction of the latch 61. When the door is closed, the latch 51 is pressed back by the door frame, causing the abutment arm 43 to disengage from the trigger arm 42. The locking member 40 swings to the locked position under the action of the torsion spring. The locking arm 41 directly blocks the retraction path of the latch 61. At this time, even if criminals insert a hard card through the door gap to pry the latch 61, the latch 61 cannot retract because it is physically blocked by the locking arm 41, thus blocking the possibility of unlocking with a latch.

[0026] See Figures 4-6 The transmission assembly includes a toothed plate group for controlling the main latch assembly and a push plate group for controlling the latch bolt assembly. The main latch assembly includes a latch bolt 81 and a support plate 82 fixed to the bottom of the latch bolt 81. The toothed plate group includes a first toothed plate 71 that is linked with the lock cylinder 30, a second toothed plate 72 that is linked with the handle shaft 20, a third toothed plate 73 that meshes with the first toothed plate 71, and a fourth toothed plate 74 that meshes with the second toothed plate 72. The third toothed plate 73 and the fourth toothed plate 74 are both provided with a linkage structure that is linked with the support plate 82. The meshing design of multiple toothed plates efficiently transmits the movement of the lock cylinder 30 and the handle shaft 20 to the latch bolt 81, realizing multi-level linkage and improving the response speed and force of the latch bolt 81.

[0027] The push plate assembly includes a linkage push plate 91 that can be linked with the lock cylinder 30, and a shift fork 92 that can be linked with the handle shaft 20. The shift fork 92 includes a shift wheel fitted on the handle shaft 20, and a first fork arm 921 and a second fork arm 922 protruding from the outer circumference of the shift wheel. One end of the linkage push plate 91 is provided with a push block that cooperates with the lock cylinder 30, and the other end of the linkage push plate 91 is hinged to the first fork arm 921. The bottom end of the second support rod 62 is fixed with a pull plate 63 that cooperates with the second fork arm 922. The combined design of the linkage push plate 91 and the shift fork 92 allows the movement of the lock cylinder 30 and the handle shaft 20 to control the extension and retraction of the latch bolt 61 respectively.

[0028] The outer circumferential surface of the dial is also formed with an unlocking paddle 923. When the dial fork 92 rotates to perform the unlocking action, the unlocking paddle 923 can push the trigger arm 42, causing the locking member 40 to swing from the locked position to the released position and remain in the released position. During normal unlocking, automatic unlocking can be achieved. When operated by key or handle, the unlocking paddle 923 pushes the trigger arm 42, forcing the locking member 40 to swing to the released position, releasing the obstruction of the latch 61, and ensuring the smoothness of legal unlocking.

[0029] The unlocking lever 923 is a fan-shaped piece located between the first fork arm 921 and the second fork arm 922. The lower end of the trigger arm 42 has a linkage section that cooperates with the unlocking lever 923. The length of the outer arc edge of the unlocking lever 923 is greater than the length of the linkage section. During the rotation of the unlocking lever 923, the front section of its outer arc edge cooperates with the linkage section to swing the locking member 40 from the locked position to the released position, and the rear section of its outer arc edge cooperates with the linkage section to keep the locking member 40 in the released position. The length of the outer arc edge of the unlocking lever 923 is greater than the linkage section of the trigger arm 42, ensuring that the front section pushes the locking member 40 to unlock during rotation, while the rear section maintains the released state, preventing the locking member 40 from springing back during unlocking.

[0030] It should be understood that in the claims and description of this utility model, all instances of "comprising..." should be understood as having an open-ended meaning, that is, equivalent to "at least comprising...", and should not be understood as having a closed-ended meaning, that is, its meaning should not be understood as "only comprising...". The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0031] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model should be included within the protection scope of this utility model.

Claims

1. A lock body for preventing bolt insertion, comprising a lock shell, a lock cylinder, a handle shaft, a main bolt assembly, a latch bolt assembly, and a transmission assembly; characterized in that, The lock housing is also equipped with a latch locking mechanism, which includes a locking element and a latch assembly. The locking element includes a hinge base and locking arms and trigger arms respectively disposed on both sides of the hinge base. The hinge base is hinged to the lock housing through a positioning pin. The locking element can swing back and forth between the locked position and the released position. A torsion spring is installed on the positioning pin to keep the locking element in the locked position. The latch assembly includes a latch and a first support rod fixed below the latch. The lock housing has a latch hole for the latch to extend. A spring is fitted on the first support rod to keep the latch in the extended position. A stop arm is provided at the bottom end of the first support rod. When the latch is in the extended position, the stop arm abuts against the trigger arm to keep the locking element in the released position. When the latch contacts the door frame and is pressed back, the stop arm releases the restriction on the trigger arm, and the locking element swings to the locked position under the action of the torsion spring.

2. The anti-truncation lock body according to claim 1, characterized in that, The latch assembly includes a latch and a second support rod fixed below the latch. A locking member is assembled between the second support rod and the first support rod. When the locking member is in the released position, the locking arm avoids the retraction path of the latch and the latch. When the locking member is in the locked position, the locking arm blocks the retraction path of the latch.

3. The anti-truncation lock body according to claim 2, characterized in that, The abutting arm and the triggering arm bend toward each other; when the contact tongue is in the extended position, the first support rod is in the initial position, and the abutting arm abuts against the triggering arm, restricting the swing of the locking member; when the contact tongue retracts, the first support rod moves down, the abutting arm makes way for the triggering arm, and the restriction on the locking member is released.

4. A lock body for preventing tongue insertion according to any one of claims 2-3, characterized in that, The transmission assembly includes a toothed plate assembly for controlling the main latch assembly and a push plate assembly for controlling the latch assembly; the main latch assembly includes a latch and a support plate fixed to the bottom of the latch.

5. The anti-truncation lock body according to claim 4, characterized in that, The toothed plate assembly includes a first toothed plate that is linked to the lock cylinder, a second toothed plate that is linked to the handle shaft, a third toothed plate that meshes with the first toothed plate, and a fourth toothed plate that meshes with the second toothed plate; both the third and fourth toothed plates are provided with a linkage structure that is linked to the support plate.

6. The anti-truncation lock body according to claim 4, characterized in that, The push plate assembly includes a linkage push plate that can be linked with the lock cylinder and a shift fork that can be linked with the handle shaft. The shift fork includes a shift wheel fitted on the handle shaft and a first fork arm and a second fork arm protruding on the outer circumferential surface of the shift wheel. One end of the linkage push plate is provided with a push block that cooperates with the lock cylinder, and the other end of the linkage push plate is hinged to the first fork arm. The bottom end of the second support rod is fixed with a pull plate that cooperates with the second fork arm.

7. A lock body for preventing tongue insertion according to claim 6, characterized in that, The outer circumferential surface of the dial is also formed with an unlocking paddle. When the dial fork rotates to perform the unlocking action, the unlocking paddle can push against the trigger arm, causing the locking member to swing from the locked position to the released position and remain in the released position.

8. The anti-truncation lock body according to claim 7, characterized in that, The unlocking lever is a fan-shaped lever located between the first fork arm and the second fork arm.

9. A lock body for preventing tongue insertion according to claim 8, characterized in that, The lower end of the trigger arm has a linkage section that cooperates with the unlocking lever. The length of the outer arc edge of the unlocking lever is greater than the length of the linkage section. During the rotation of the unlocking lever, the front section of its outer arc edge cooperates with the linkage section to make the locking member swing from the locked position to the released position, and the rear section of its outer arc edge cooperates with the linkage section to keep the locking member in the released position.

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