Self-locking mechanism of lock

Abstract

Provided in the present utility model is a self-locking mechanism of a lock, the lock comprising a lock housing, a lock cylinder and an insert pin, the insert pin having a snap-fit position, the lock housing having a space into which the insert pin is inserted, an insert being provided within the lock housing, and a self-locking mechanism being provided within the lock housing. The self-locking mechanism comprises a snap-fit member, which is arranged in the lock housing, wherein the snap-fit member has a normal state and a compressed state; the snap-fit member is provided with a first blocking portion extending into the range of the trajectory of movement of the insert and a second blocking portion extending into the range of the trajectory of insertion of the insert pin; and the inside of the lock housing is provided with a first elastic member for driving the snap-fit member to switch from the compressed state to the normal state. By providing the snap-fit member that is provided with the first blocking portion and the second blocking portion, when the insert pin is inserted into the lock housing, the first blocking portion of the snap-fit member is automatically pushed away, so as to release the limitation of the second blocking portion on the insert, such that the insert automatically engages under the action of the first elastic member, which eliminates the need to take out a key and turn the key for locking, making it more convenient to use.

Description

A self-locking mechanism for a lock Technical Field

[0001] This utility model belongs to the field of lock technology, specifically a self-locking mechanism for a lock. Background Technology

[0002] Most locks have a self-locking mechanism, but folding locks do not. For example, in a folding lock disclosed in publication number CN113389443A, there is no self-locking mechanism. The folding lock requires pressing the protruding lock cylinder seat into the fixed sleeve so that the lock pin passes through the insertion hole of the movable folding piece and the insertion hole of the lock seat, and the compression spring is compressed. The positioning steel ball on the lock cylinder seat corresponds to the positioning groove of the fixed sleeve. Therefore, it is more complicated to operate and has a poor user experience. Technical issues

[0003] The technical problem to be solved by this utility model is how to design a self-locking mechanism for locks.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A self-locking mechanism for a lock includes a lock housing, a lock cylinder, and a pin. The pin has a locking position, the lock housing has a space for the pin to be inserted, and a plug is provided inside the lock housing to lock the pin. The lock housing has a self-locking mechanism in which the plug automatically engages with the pin locking position when the pin is inserted into the lock housing. The self-locking mechanism includes a snap-fit ​​member movable along the insertion direction of the pin. The snap-fit ​​member is located inside the lock housing and has a normal state and a compressed state. The snap-fit ​​member has a first stop portion extending into the range of the plug's movement trajectory, and a second stop portion extending into the range of the pin's insertion trajectory. When the snap-fit ​​member is in the normal state, the first stop portion extends into the range of the plug's movement trajectory to limit the plug's movement range. When the pin is inserted into the lock housing, the pin presses against the second stop portion of the snap-fit ​​member, causing the snap-fit ​​member to be in a compressed state. The lock housing has a first elastic member that drives the snap-fit ​​member to switch from the compressed state to the normal state.

[0006] Preferably, the device also includes a drive mechanism for disengaging the plug-in from the pin slot. The drive mechanism includes an inner sleeve that is fixedly assembled with the lock housing. The inner sleeve has a spiral groove, and a transmission pin that is fixedly connected to the plug-in and inserted into the spiral groove is fixedly connected to the plug-in. The inner sleeve has space for the plug-in to move axially and rotate circumferentially. When the lock cylinder is rotating, the plug-in rotates and moves axially within the inner sleeve.

[0007] Preferably, the end of the lock cylinder connected to the plug is a long shaft, the length of which is greater than the axial movement distance of the plug. The plug can be axially movably sleeved on the long shaft of the lock cylinder, and the plug has a space for the axial movement of the long shaft, the length of which is greater than the axial movement distance of the plug. A second elastic element is provided between the lock cylinder and the plug to push the plug away from the lock cylinder.

[0008] Preferably, the insert includes a sleeve and a post, and the sleeve and the post are fixed together by a fixing pin.

[0009] Preferably, both the first elastic element and the second elastic element are springs. One end of the first elastic element abuts against the inner wall of the lock housing, and the other end abuts against the snap-fit ​​component. One end of the second elastic element abuts against the plug, and the other end abuts against the core shell outside the lock cylinder.

[0010] Preferably, the device also includes a hollow tube, wherein the core shell, inner sleeve, and snap-fit ​​are all disposed inside the hollow tube and are fixed between the core shell and the hollow tube by pins; the inner sleeve is fixed between the inner sleeve and the hollow tube by pins; and the hollow tube is disposed inside the lock housing.

[0011] Preferably, the first stop portion is a protrusion extending along the end of the snap-fit ​​member, and there are two protrusions, with a shape between the two protrusions that matches the shape of the pin end.

[0012] Preferably, the snap-fit ​​member has an arc-shaped recess at one end where the second stop portion is provided, and the second stop portion is located at the edge of the arc-shaped recess portion, and the second stop portion is also a recess portion.

[0013] The beneficial effects of this utility model are as follows: By setting a snap-fit ​​component and providing a first stop and a second stop on the snap-fit ​​component, the first stop of the snap-fit ​​component is automatically pushed open when the pin is inserted into the lock housing, thereby releasing the restriction of the second stop on the plug-in. This allows the plug-in to automatically lock under the action of the first elastic element, avoiding the step of taking out the key and turning it to lock, making it more convenient to use. Attached Figure Description

[0014] Figure 1 is a cross-sectional view of the embodiment;

[0015] Figure 2 is an exploded view of the lock cylinder, inner sleeve, and plug-in components.

[0016] Figure 3 is a schematic diagram of the snap-fit ​​connector in its normal state inside the lock housing;

[0017] Figure 4 is a schematic diagram of the structure of the snap-fit ​​component in the compressed state inside the lock housing;

[0018] Figure 5 is a schematic diagram of the snap-fit ​​component;

[0019] Figure 6 is a structural schematic diagram of the snap-fit ​​component from another perspective;

[0020] Figure 7 is a schematic diagram of the inner sleeve structure;

[0021] Figure 8 is a schematic diagram of the plug-in structure. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0023] Please refer to Figures 1-8. The figures show a folding lock, including a lock housing 1, a lock cylinder 2, a pin 3, and a folding pin 4. The folding pin 4 is a conventional technology for folding locks and will not be elaborated upon here. The lock cylinder 2 is prior art and is not related to the technical problem to be solved in this application; its specific structure will not be described in detail here. The pin 3 has a locking position 31, specifically a circular through hole. The lock housing 1 has a space for inserting the pin 3, and a plug 5 is provided inside the lock housing 1 to lock the pin 3. The lock housing 1 has a self-locking mechanism in which the plug 5 automatically engages with the pin 3 locking position 31 when the pin 3 is inserted into the lock housing 1. This self-locking mechanism includes a latching member 6 that can move along the insertion direction of the pin 3. The latching member 6 is located inside the lock housing 1 and has a normal state and a compressed state. The latching member 6 has a first stop portion 61 extending into the range of the plug 5's movement trajectory. The latching member 6 is provided with a second stop 62 extending into the insertion trajectory range of the pin 3. When the latching member 6 is in the normal state, the first stop 61 extends into the movement trajectory range of the plug 5 to limit the movement range of the plug 5. When the pin 3 is inserted into the lock housing 1, the pin 3 presses against the second stop 62 of the latching member 6, at which time the latching member 6 is in a compressed state. When the latching member 6 is in a compressed state, the first stop 61 retracts with the latching member 6, and the plug 5 is not restricted by the first stop 61 and can be freely inserted into the locking position 31 of the pin 3. Inside the lock housing 1, there is a first elastic element 7 that drives the latching member 6 to switch from the compressed state to the normal state. The first elastic element 7 is a spring, with one end abutting against the inner wall of the lock housing 1 and the other end abutting against the latching member 6. When the latching member 6 is in a compressed state, the plug 5 is automatically inserted into the locking position 31 of the pin 3 by the action of the spring, realizing self-locking.

[0024] To facilitate the removal of pin 3, this embodiment also includes a drive mechanism for disengaging the plug-in 5 from pin 3's locking position 31. The lock cylinder 2 is also part of this drive mechanism, which further includes an inner sleeve 8 fixedly assembled with the lock housing 1. The inner sleeve 8 has a spiral groove 81, and a transmission pin 51 inserted into the spiral groove 81 is fixedly connected to the plug-in 5. The inner sleeve 8 provides space for the plug-in 5 to move axially and rotate circumferentially. When the lock cylinder 2 rotates, the plug-in 5 rotates and moves axially within the inner sleeve 8. In this embodiment, by providing a spiral groove 81 on the fixed inner sleeve 8 and a transmission pin 51 moving within the spiral groove 81 on the plug-in 5, the lock cylinder 2 rotates when the matching key is turned, causing the plug-in 5 to rotate. The transmission pin 51 of the plug-in 5 is restricted by the spiral groove 81, allowing the plug-in 5 to not only rotate but also move axially, thus disengaging the plug-in 5 from pin 3's locking position 31 and enabling the pin 3 to be easily removed.

[0025] To ensure smooth transmission between the lock cylinder 2 and the plug-in 5, this embodiment designs the end connecting the lock cylinder 2 and the plug-in 5 as a long shaft 21. The length of the long shaft 21 is greater than the axial movement distance of the plug-in 5. The plug-in 5 is axially movable and sleeved on the long shaft 21 of the lock cylinder 2. The plug-in 5 has a space within it for the axial movement of the long shaft 21, the length of which is greater than the axial movement distance of the plug-in 5. A second elastic element 9, also a spring, is provided between the lock cylinder 2 and the plug-in 5 to push the plug-in 5 away from the lock cylinder 2. One end of the second elastic element 9 abuts against the plug-in 5, and the other end abuts against the core shell 11 outside the lock cylinder 2.

[0026] The plug-in 5 described in this embodiment includes a sleeve 53 and a plug 52, and the sleeve 53 and the plug 52 are fixed together by a fixing pin.

[0027] For aesthetic purposes and to conceal the pin location, thus preventing forced entry, this embodiment also includes a hollow tube 10. The core shell 11, inner sleeve 8, and snap-fit ​​component 6 are all housed within the hollow tube 10 and secured to the core shell 11 and hollow tube 10 by pins. Similarly, the inner sleeve 8 is secured to the hollow tube 10 by pins. Since the hollow tube 10 is located within the lock housing 1, the surface of the lock housing 1 becomes smooth, and the lock housing 1 also conceals the pin on the hollow tube 10, making it difficult for unauthorized unlockers to locate the pin and increasing the difficulty of unlocking.

[0028] In this embodiment, the first stop portion 61 is a protrusion extending along the end of the snap-fit ​​member 6, and there are two protrusions. Between the two protrusions, there is a shape that matches the shape of the end of the pin 3, so that the contact surface is larger when the pin 3 abuts against the protrusion. The two protrusions of the first stop portion 61 are symmetrically arranged, so that when the pin 3 is inserted and pushed against the first stop portion 61, the force on both sides is uniform and the contact area is large, which prevents the snap-fit ​​member 6 from being twisted due to uneven force and also reduces the wear of the snap-fit ​​member 6.

[0029] The snap-fit ​​component 6 has an arc-shaped recess at one end of the second stop portion 62. The second stop portion 62 is located at the edge of the arc-shaped recess and is also a recess. The arc shape of the second stop portion 62 increases the contact area with the plug-in 5, thereby improving the service life of the second stop portion 62.

Claims

1. A self-locking mechanism for a lock, comprising a lock housing, a lock cylinder, and a pin, wherein the pin has a locking position, the lock housing has a space for inserting the pin, and a plug is provided inside the lock housing to lock the pin, characterized in that: The lock housing has a self-locking mechanism that automatically engages with the pin when the pin is inserted into the lock housing. The self-locking mechanism includes a snap-fit ​​component that can move along the insertion direction of the pin. The snap-fit ​​component is located inside the lock housing and has a normal state and a compressed state. The snap-fit ​​component has a first stop portion extending into the range of the pin's movement trajectory and a second stop portion extending into the range of the pin's insertion trajectory. When the snap-fit ​​component is in the normal state, the first stop portion extends into the range of the pin's movement trajectory to limit the pin's movement range. When the pin is inserted into the lock housing, the pin presses against the second stop portion of the snap-fit ​​component, causing the snap-fit ​​component to be in the compressed state. The lock housing also has a first elastic element that drives the snap-fit ​​component to switch from the compressed state to the normal state.

2. The self-locking mechanism of a lock as described in claim 1, characterized in that: It also includes a drive mechanism for disengaging the plug-in from the pin slot. The drive mechanism includes an inner sleeve that is fixedly assembled with the lock housing. The inner sleeve has a spiral groove, and a transmission pin that is fixedly connected to the plug-in and inserted into the spiral groove is fixedly connected to the plug-in. The inner sleeve has space for the plug-in to move axially and rotate circumferentially. When the lock cylinder is rotating, the plug-in rotates and moves axially within the inner sleeve.

3. The self-locking mechanism of a lock as described in claim 2, characterized in that: The lock cylinder is connected to the plug-in at one end as a long shaft. The length of the long shaft is greater than the axial movement distance of the plug-in. The plug-in can be axially movably sleeved on the long shaft of the lock cylinder. The plug-in has a space for the long shaft to move axially. The length of this space is greater than the axial movement distance of the plug-in. A second elastic element is provided between the lock cylinder and the plug-in to push the plug-in away from the lock cylinder.

4. The self-locking mechanism of a lock as described in claim 3, characterized in that: The plug-in includes a sleeve and a pin, which are fixed together by a fixing pin.

5. The self-locking mechanism of a lock as described in claim 3, characterized in that: Both the first elastic element and the second elastic element are springs. One end of the first elastic element abuts against the inner wall of the lock housing, and the other end abuts against the snap-fit ​​component. One end of the second elastic element abuts against the plug, and the other end abuts against the outer shell of the lock cylinder.

6. The self-locking mechanism of a lock as described in claim 5, characterized in that: It also includes a hollow tube, wherein the core shell, inner sleeve and snap-fit ​​are all disposed inside the hollow tube and are fixed between the core shell and the hollow tube by pins; the inner sleeve is fixed between the hollow tube and the lock shell by pins; the hollow tube is disposed inside the lock shell.

7. The self-locking mechanism of a lock as described in claim 1, characterized in that: The first stop portion is a protrusion extending along the end of the snap-fit ​​member, and there are two protrusions, with a shape between the two protrusions that matches the shape of the pin end.

8. The self-locking mechanism of a lock as described in claim 1, characterized in that: The snap-fit ​​component has an arc-shaped recess at one end where the second stop portion is provided. The second stop portion is located at the edge of the arc-shaped recess portion, and the second stop portion is also a recess portion.

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