Lock capable of preventing key from being pulled out

Abstract

The utility model provides a lock capable of preventing a key from being pulled out, which achieves the effect that a lock shaft cannot rotate to a locking position in an unlocking state so as to achieve the effect that the key cannot be taken out in the unlocking state, and comprises a lock body, the lock shaft, a spring and a fixing pin, the lock shaft is installed in the lock body, and the head of the lock shaft and the lock body limit rotation and limit the axial movement stroke of the lock shaft. An annular clamping groove is formed in the circumferential surface of the lock shaft; at least one tangent plane is arranged at the tail part of the lock shaft and is connected to the annular clamping groove along the axis direction of the lock shaft; the spring is arranged in the lock body, sleeves the lock shaft and is used for popping up the lock shaft; the fixing pin is installed in the lock body and movably embedded in the annular clamping groove so that the locking function of the compression spring and the lock can be achieved. When the lock shaft is rotated and the fixing pin is opposite to the tangent plane, the fixing pin is separated from the annular clamping groove under the elastic force effect of the spring, and the unlocking function of the lock is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary shaft type push locks, in particular to a key-pulling-proof lock. Background Art

[0002] A pivot-type push-button lock locks lock by pressing the lock shaft into the lock housing. The lock shaft generally consists of a sleeve and a lock core. The sleeve is mounted in the lock housing and can move axially but not rotate relative to it. The lock core is mounted in the sleeve and can rotate but not move axially. In other words, the lock core can move axially relative to the lock shaft synchronously with the sleeve. The working principle of the pivot-type push-button lock is as follows: when the appropriate key is inserted into the lock core and the lock core is rotated, the axial movement between the unlocking sleeve and the lock housing is released, and the lock shaft is ejected from the lock housing, thereby driving the tail of the lock core out of the locked position and unlocking.

[0003] The current rotary push-button locks on the market can rotate freely and remove the key when subjected to external force after the lock shaft pops up to unlock. That is, when the lock is in the unlocked state, the key may fall out or be taken out, posing a risk of the key falling or being lost, causing inconvenience to the user. Utility Model Content

[0004] The purpose of the utility model is to provide a key-removal-proof lock to solve the problems existing in the prior art and to achieve the effect that the lock shaft cannot be rotated to the locked position in the unlocked state, thereby achieving the effect that the key cannot be taken out in the unlocked state.

[0005] In order to achieve the above objectives, the solution of the present invention is:

[0006] A key-removal-proof lock comprises a lock body, a lock shaft, a spring and a fixing pin; the lock shaft comprises a lock body installed in the lock body, and the head of the lock shaft and the lock body limit rotation and limit the axial movement stroke of the lock shaft; the circumferential surface of the lock shaft is provided with an annular groove; the tail of the lock shaft is provided with at least one cut surface, and the cut surface is connected to the annular groove along the axial direction of the lock shaft; the spring is provided in the lock body and sleeved on the lock shaft for popping out the lock shaft; the fixing pin is installed in the lock body and movably embedded in the annular groove to realize the locking function of compressing the spring and the lock; when the lock shaft is rotated and the fixing pin is opposite to the cut surface, the fixing pin disengages from the annular groove under the elastic force of the spring to realize the unlocking function of the lock.

[0007] A mounting groove is provided at one end of the lock body, and a lock hole is provided at the bottom of the mounting groove; the lock shaft and the spring are both fitted in the mounting groove, and the tail of the lock shaft is movably passed through the lock hole; the fixing pin is installed on the side wall of the lock hole.

[0008] Preferably, opposite side walls of the lock hole are respectively provided with an embedding groove and a through hole; the through hole is connected to the surface of the lock body, and the embedding groove is coaxially arranged with the through hole; the fixing pin passes through the through hole into the lock hole and fits in the embedding groove.

[0009] Preferably, the side wall of the installation groove is provided with a waist hole arranged along the axial direction of the lock body, and the side surface of the head of the lock shaft is provided with a positioning pin; the positioning pin is movably fitted in the waist hole.

[0010] The spring is a conical spring.

[0011] The lock shaft includes a sleeve and a lock core; the sleeve is assembled with the lock body to achieve axial movement and non-rotation, and the two ends of the spring respectively abut the sleeve and the lock body; the annular groove and the cross section are both provided on the lock core.

[0012] Preferably, the lock shaft further includes a fixing ring; the fixing ring is fixedly connected to the inner wall of the sleeve and is used for axially limiting the lock core.

[0013] The anti-key-pulling lock is a blade lock or a pin lock.

[0014] After adopting the above technical solution, the utility model has the following technical effects:

[0015] When the key is inserted and the lock cylinder is rotated to unlock, the fixing pin can be disengaged from the annular groove by the cut surface, so that the shaft sleeve is bounced up under the elastic force of the spring, driving the lock cylinder to move axially to unlock; at this time, since the fixing pin abuts the cut surface, the lock cylinder cannot be rotated and cannot be reset to the locked position, that is, the key cannot be taken out in the unlocked state, avoiding the risk of the key falling or losing, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an exploded view of a specific embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of a locked state of a specific embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the unlocking process of a specific embodiment of the utility model;

[0019] Figure 4 This is a schematic diagram of an unlocked state of a specific embodiment of the utility model;

[0020] Figure 5 This is an exploded view of the lock shaft portion of the first embodiment of the present utility model;

[0021] Figure 6This is an exploded view of the lock shaft portion of the second embodiment of the present utility model;

[0022] Figure 7 This is an exploded view of the lock shaft portion of the third embodiment of the present utility model;

[0023] Figure 8 This is an exploded view of the lock shaft portion of the fourth embodiment of the present utility model;

[0024] Description of Figure Numbers:

[0025] 1---Lock body; 11---Mounting slot; 12---Lock hole; 13---Embedded groove; 14---Through hole; 15---Waist hole;

[0026] 2--Lock shaft; 21---Sleeve; 22---Lock core; 221--Annular groove; 222--Cut surface; 23---Retaining ring; 24---Tumbler; 25---Latch pin; 26---Blade; 27---Lock bolt;

[0027] 3----Spring;

[0028] 4----Fixing pin;

[0029] 5----Location pin;

[0030] 6----Nut. DETAILED DESCRIPTION

[0031] In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of protection of the present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] In the description of the embodiments of the present invention, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are merely simplified descriptions for the convenience of describing the embodiments of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0036] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0039] In addition, the present invention provides examples of various specific processes and materials, but a person skilled in the art may be aware of the application of other processes and / or the use of other materials.

[0040] refer to Figures 1 to 4As shown, the utility model discloses an anti-key-pulling lock, comprising a lock body 1, a lock shaft 2, a spring 3 and a fixing pin 4;

[0041] The lock shaft 2 is mounted within the lock body 1, and the head of the lock shaft 2 is the end for the user to press to lock the lock. The head of the lock shaft 2 and the lock body 1 restrict rotation and limit the axial movement of the lock shaft 2. The circumference of the lock shaft 2 is provided with a ring-shaped groove 221 as a locking groove. The tail of the lock shaft 2 is the end that serves as the lock tongue or is connected to the lock tongue. The side surface of the lock shaft 2 is provided with at least one cut surface 222, which is connected to the annular groove 221 along the axis of the lock shaft 2. The number of cut surfaces 222 determines the number of unlocking positions (angles) of the lock.

[0042] The spring 3 is arranged in the lock body 1 and sleeved on the lock shaft 2, and is used to eject the lock shaft 2;

[0043] The fixing pin 4 is installed in the lock body 1 and is movably embedded in the annular groove 221 to realize the locking function of the compression spring 3 and the lock;

[0044] When the lock shaft 2 is rotated and the fixing pin 4 is aligned with the cut surface 222 , the fixing pin 4 is released from the annular groove 221 under the elastic force of the spring 3 , thereby realizing the unlocking function of the lock.

[0045] In some embodiments of the present invention, a mounting groove 11 is provided at one end of the lock body 1, and a lock hole 12 is provided at the bottom of the mounting groove 11; the lock shaft 2 and the spring 3 are both fitted in the mounting groove 11, and the tail of the lock shaft 2 is movably passed through the lock hole 12; the fixing pin 4 is installed on the side wall of the lock hole 12.

[0046] Furthermore, the opposite side walls of the above-mentioned lock hole 12 are respectively provided with an embedding groove 13 and a through hole 14; the through hole 14 is connected to the surface of the lock body 1, and the embedding groove 13 and the through hole 14 are coaxially arranged; the fixing pin 4 is inserted into the lock hole 12 through the through hole 14 and fits in the embedding groove 13 to realize the installation of the fixing pin 4 in the lock hole 12.

[0047] The sidewall of the mounting slot 11 is provided with a waist hole 15 extending along the axis of the lock body 1. A positioning pin 5 is provided on the side of the head of the lock shaft 2. The positioning pin 5 is movably fitted within the waist hole 15, preventing the lock shaft 2 from rotating relative to the lock body 1. The length of the waist hole 15 limits the axial travel of the lock shaft 2. In this embodiment, the positioning pin 5 is fixed to the side of the lock shaft 2 by riveting.

[0048] In some embodiments of the present invention, the spring 3 is a conical spring, which can achieve a smaller spring stroke and is conducive to the miniaturization design of the product (the minimum distance between the lock shaft 2 and the lock body 1 in the axial direction can be designed to be smaller).

[0049] In some embodiments of the present invention, the above-mentioned lock shaft 2 includes a sleeve 21 and a lock core 22; the sleeve 21 is assembled with the lock body 1 to achieve axial movement and non-rotation, and the two ends of the spring 3 respectively abut the sleeve 21 and the lock body 1 (that is, the bottom of the above-mentioned mounting groove 11); the above-mentioned annular groove 221 and cross-section 222 are all arranged on the lock core 22 (the accompanying drawings are mainly for schematic purposes, and the detailed internal structure of the lock core 22 is not drawn. The lock core 22 can adopt the internal structure of a conventional lock core, which does not affect the functional realization of the present invention).

[0050] Furthermore, the lock shaft 2 further includes a fixing ring 23 ; the fixing ring 23 is fixedly connected to the inner wall of the sleeve 21 and is used to axially limit the lock core 22 to prevent the lock core 22 from falling out of the sleeve 21 .

[0051] The lock body 1 is generally fixed on a mounting plane (such as a door) via a nut 6 .

[0052] See also Figures 2 to 4 , the working principle of the utility model is:

[0053] Through the above scheme, when the key is inserted and the lock cylinder 22 is rotated to unlock the door, when the cut surface 222 of the lock cylinder 22 is rotated to be opposite to the fixing pin 4, the fixing pin 4 can be disengaged from the annular groove 221 through the cut surface 222, so that the sleeve 21 is bounced up under the elastic force of the spring 3, driving the lock cylinder 22 to move axially to achieve unlocking; at this time, since the fixing pin 4 abuts the cut surface 222, the lock cylinder 22 cannot be rotated and cannot be reset to the locked position, that is, the key cannot be taken out in the unlocked state, avoiding the risk of the key falling or losing, thereby improving the user experience.

[0054] The anti-key-pulling lock of the present invention is a blade lock or a pin tumbler lock; wherein the pin tumbler lock includes a tubular pin tumbler lock, a double-sided pin tumbler lock and a mortise pin tumbler lock, etc., and the blade lock includes an Ambilo blade lock, a carved blade lock, etc.; Figures 5 to 8 The locking shaft parts of the first to fourth embodiments of the present invention are respectively shown.

[0055] See also Figure 5 , which is the lock shaft part of the tubular pin lock: a number of axially arranged pins 24 and latches 25 corresponding to the pins 24 are arranged in its shaft sleeve 21; after the adapted key is inserted into the lock cylinder 22, the pins 24 can be pushed to the unlocked position, so that the corresponding latches 25 are separated from the end surface of the lock cylinder 22 and the rotation restriction of the lock cylinder 22 is released, and the lock cylinder 22 can rotate relative to the shaft sleeve 21, thereby completing the unlocking or locking action.

[0056] See also Figure 6, which is the lock shaft part of the double-sided pin lock: a number of radially arranged pins 24 are arranged in its sleeve 21, and the pins 24 are arranged on opposite sides of the sleeve 21, and corresponding latches 25 are provided; after the adapted key is inserted into the lock cylinder 22, the pins 24 can be pushed to the unlocking position, so that the corresponding latches 25 are separated from the circumference of the lock cylinder 22 and the rotation restriction of the lock cylinder 22 is released, and the lock cylinder 22 can rotate relative to the sleeve 21, thereby completing the unlocking or locking action.

[0057] See also Figure 7 , is the lock shaft part of the Anbile blade lock: its shaft sleeve 21 is equipped with several blades 26 (including top plate, row plates and spacers, etc.) arranged along the axial direction; after the appropriate key is inserted into the lock cylinder 22 and rotated to the unlocking position, the top plate and row plates are misaligned, that is, the center holes of the top plate and row plates are not in a line, and the key cannot be pulled out at this time; after rotating to the locking position again, the lock bolt 27 falls into the groove on the inner wall of the lock shell, and the center holes of the top plate and row plates are in a line, and the key can be pulled out at this time.

[0058] See also Figure 8 , which is the lock shaft part of the carved blade lock: a number of blades 26 inserted radially are arranged in its shaft sleeve 21; after the appropriate key is inserted into the lock cylinder 22 and rotated to the unlocking position, the blades are misaligned and the key cannot be pulled out; after being rotated to the locking position again, the center holes of the blades 26 are in a line, and the key can be pulled out at this time.

[0059] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A key-removal-proof lock, characterized in that: It includes a lock body, a lock shaft, a spring and a fixing pin; The lock shaft includes a head portion installed in the lock body, and the head portion of the lock shaft and the lock body are restricted from rotating and from axially moving the lock shaft; a peripheral surface of the lock shaft is provided with an annular groove; a tail portion of the lock shaft is provided with at least one cut surface, and the cut surface is connected to the annular groove along the axial direction of the lock shaft; The spring is arranged in the lock body and sleeved on the lock shaft, and is used to pop out the lock shaft; The fixing pin is installed in the lock body and movably embedded in the annular groove to realize the locking function of compressing the spring and the lock; When the lock shaft is rotated and the fixing pin is made to face the cut surface, the fixing pin is released from the annular groove under the elastic force of the spring, so as to realize the unlocking function of the lock.

2. The anti-key-pulling lock according to claim 1, characterized in that: A mounting groove is provided at one end of the lock body, and a lock hole is provided at the bottom of the mounting groove; the lock shaft and the spring are both fitted in the mounting groove, and the tail of the lock shaft is movably inserted into the lock hole; the fixing pin is installed on the side wall of the lock hole.

3. The anti-key-pulling lock according to claim 2, characterized in that: The opposite side walls of the lock hole are respectively provided with an embedding groove and a through hole; the through hole is connected to the surface of the lock body, and the embedding groove is coaxially arranged with the through hole; the fixing pin penetrates into the lock hole through the through hole and fits in the embedding groove.

4. The anti-key-pulling lock according to claim 2, characterized in that: The side wall of the installation groove is provided with a waist hole arranged along the axial direction of the lock body, and the head side of the lock shaft is provided with a positioning pin; the positioning pin is movably fitted in the waist hole.

5. The anti-key-pulling lock according to claim 1, characterized in that: The spring is a conical spring.

6. The anti-key-pulling lock according to any one of claims 1 to 5, characterized in that: The lock shaft includes a sleeve and a lock core; the sleeve is assembled with the lock body to achieve axial movement and non-rotation, and the two ends of the spring abut against the sleeve and the lock body respectively; the annular groove and the section are both arranged on the lock core.

7. The anti-key-pulling lock according to claim 6, characterized in that: The lock shaft also includes a fixing ring; the fixing ring is fixedly connected to the inner wall of the sleeve and is used for axially limiting the lock core.

8. The anti-key-pulling lock according to claim 1, characterized in that: The anti-key-pulling lock is a blade lock or a pin lock.

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