Magnetic mute lock for security door

Abstract

The utility model discloses a magnetic mute lock of an anti-theft door, and belongs to the field of anti-theft door locks. According to a traditional lock with a latch bolt structure, when a door leaf is closed, a latch bolt can collide with a door frame, large metal collision sound is generated, the living experience of a user is seriously affected, the lock bolt position on the door frame and the latch bolt position on a lock body can be abraded, the service life of the lock is shortened, and the safety of an anti-theft door is reduced. The lock tongue of the lock adopts a cylindrical tongue end part, an in-tongue magnetic attraction device is arranged in the tongue end part, an in-box magnetic attraction device is arranged in a position, corresponding to the lock tongue, in the lock catch box, and a lock tongue automatic retraction device is arranged in the lock body. After being closed in a magnetic attraction working mode, the lock is combined with the cylindrical bolt end structure, silent locking is achieved, the service life of the lock is prolonged, abnormal opening modes such as insertion of an external clamping piece aiming at an inclined spring bolt structure can be effectively prevented, and the safety performance of an anti-theft door is improved.

Description

Technical Field

[0001] The utility model relates to the field of anti-theft door locks, in particular to a magnetic silent lock for anti-theft doors. Background Art

[0002] In the current security door lock market, despite continuous advancements in lock design and manufacturing technology, traditional lock structures, particularly those relying on a latch bolt, still present numerous deficiencies. The latch bolt was originally designed to reduce resistance against the door frame, allowing the door leaf to be locked smoothly. However, this design also presents a significant problem: when the door leaf closes, the latch bolt strikes the door frame, producing a loud metallic clatter that severely impacts the user's living experience. Furthermore, frequent impacts not only cause wear on the latch bolt on the door frame and the lock body, affecting the product's appearance and flexibility, but also shorten the lock's lifespan and reduce the security of the security door.

[0003] More seriously, the latch bolt structure increases the risk of the lock being opened by unauthorized means. For example, criminals might use tools such as cards to insert and open the lock through the tiny gap between the latch bolt and the door frame, which undoubtedly reduces the lock's security.

[0004] With the development of technology, users have put forward higher requirements for the quietness, durability and security of locks. Traditional latch bolt locks can no longer meet these demands. Therefore, the market urgently needs a new lock design to solve the many problems existing locks have in use. Utility Model Content

[0005] The technical problem to be solved and the technical task proposed by this utility model are to improve and perfect the existing technical solutions and provide a magnetic silent lock for anti-theft doors, so as to reduce the noise when opening and closing the door, prolong the service life of the lock, and improve the security of the anti-theft door. To this end, this utility model adopts the following technical solutions.

[0006] A magnetic silent lock for anti-theft doors, comprising a lock body located on a door leaf and a lock strike box located on a door frame, the lock body being provided with a lock tongue and a guide plate, the lock body being provided with a manual retraction linkage device linked to a door handle, the lock tongue having a cylindrical tongue end portion, the tongue end portion being provided with an internal magnetic device, the lock strike box being provided with an internal magnetic device at a position corresponding to the lock tongue, and the lock body being provided with an automatic lock tongue retraction device. Under the action of the automatic retraction device of the lock tongue, the lock tongue is in a retracted state by default. When the door is closed, the magnetic device in the tongue gradually approaches the magnetic device in the box, gradually weakening the retraction force of the automatic retraction device of the lock tongue. When the suction force exceeds the retraction force of the automatic retraction device of the lock tongue and gradually increases, the lock tongue slowly extends and smoothly enters the lock box of the lock box through magnetic attraction. Compared with the traditional oblique lock tongue structure, when the door is closed, the lock tongue will not collide with the door frame and make a collision sound, which not only reduces the door closing noise and achieves a silent locking effect, but also reduces the probability of door frame, lock tongue and lock body failure caused by long-term lock tongue collision, which can effectively extend the service life of the lock. Moreover, after closing through the magnetic working mode and combined with the cylindrical tongue end structure, it prevents external card insertion and other abnormal opening methods for the oblique lock tongue structure, thereby improving the safety performance of the anti-theft door.

[0007] As a preferred technical means: a lock tongue cavity is provided on the right side of the magnetic attraction device in the box, and anti-collision and sound-absorbing cotton is provided in the lock tongue cavity to reduce friction and contact noise when the lock tongue enters. This has a sound-absorbing effect and can better reduce the friction and contact noise when the lock tongue enters the lock tongue cavity when closing the door.

[0008] As a preferred technical means, the lock tongue comprises a tongue body and a blocking member. The tongue body has an inner tongue cavity at its left end, and the inner tongue magnetic device is disposed in the inner tongue cavity. The tongue body has an installation hole on the right side of the inner tongue cavity for inserting the inner tongue magnetic device into the inner tongue cavity, and the blocking member is inserted into the installation hole and secured. This effectively achieves the installation and protection of the inner tongue magnetic device.

[0009] As a preferred technical means: the tongue is a single-part structure. Compared with the traditional tongue structure composed of multiple parts, the single-part overall structure is simpler and stronger, does not require a complicated assembly and manufacturing process, and is easy to install and maintain.

[0010] As a preferred technical means, the blocking piece and the tongue body are integrated into one body through a snap-fit ​​structure. The snap-fit ​​structure can achieve fast and secure assembly, improve the integrity of the blocking piece and the tongue body, and make the overall structure look simpler and more stable.

[0011] As a preferred technical approach, a wear-resistant, self-lubricating plastic guide sleeve is installed on the guide plate at a position corresponding to the lock tongue. The tongue body slides in contact with the plastic guide sleeve. The tongue body and the blocking member are made of the same plastic material as the plastic guide sleeve. The wear-resistant, self-lubricating plastic material and the guide structure provide excellent tongue guidance and effectively reduce friction.

[0012] As a preferred technical measure, symmetrical guide ribs are provided on the left and right sides or the upper and lower sides of the tongue end, with the guide ribs having a small guiding slope. By providing symmetrical guide ribs with a small slope, the guidance accuracy is increased, the directional guidance effect is improved, and a better guidance and quieting effect can be achieved.

[0013] As a preferred technical measure, the clutch plate of the manual retraction linkage device is connected to the return groove on the right side of the tongue body to manually retract the lock bolt. The return groove is directly formed on the tongue body during tongue body molding. The clutch plate is connected to the return groove to effectively retract the lock bolt by pulling the door handle.

[0014] As a preferred technical means, the automatic bolt retraction device utilizes a torsion spring. One end of the spring's torsion arm engages a slot in the center of the bolt body, while the other end engages the lower right end of a plastic guide sleeve within the lock body. The spring body of the torsion spring passes through its center hole and fits over a column shaft provided on the lock body. The spring's elasticity enables automatic bolt retraction. When the door is opened, the spring's elasticity retracts the bolt, preventing it from colliding with the door frame when the door is closed. Using a torsion spring to achieve retraction offers a simple structure and low cost.

[0015] Beneficial effects: Compared with the traditional oblique lock tongue structure, when closing the door, the lock tongue will not collide with the door frame and make a collision sound, which not only reduces the door closing noise and achieves a silent locking effect, but also reduces the probability of door frame, lock tongue and lock body failure caused by long-term lock tongue collision, which can effectively extend the service life of the lock. Moreover, after closing by magnetic suction working mode and combining with the cylindrical tongue end structure, it prevents abnormal opening methods such as external card insertion for the oblique lock tongue structure, thereby improving the safety performance of the anti-theft door. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model lock.

[0017] Figure 2 This utility model Figure 1 AA cross-sectional view diagram.

[0018] Figure 3 It is a schematic diagram of the matching of the lock tongue and the plastic guide sleeve in the utility model.

[0019] In the figure: 1. Lock body; 101. Lock tongue; 10101. Tongue body; 10102. Blocking piece; 10103. Tongue cavity; 10104. Guide rib; 10105. Rewind groove; 10106. Card slot; 10107. Tongue end; 102. Guide plate; 103. Manual retraction linkage device; 10301. Clutch plate; 104. Magnetic device inside tongue; 105. Automatic retraction device of lock tongue; 106. Plastic guide sleeve; 107. Column shaft; 2. Lock box; 201. Magnetic device inside the box; 202. Lock tongue cavity; 203. Anti-collision and sound-absorbing cotton; 204. Plastic protective shell. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings.

[0021] In the description of the present invention, it should be understood that terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0022] like Figure 1-3 As shown, a magnetic silent lock for anti-theft doors includes a lock body 1 located on the door leaf and a lock box 2 located on the door frame. A lock tongue 101 and a guide piece 102 are provided on the lock body 1. A manual pull-back linkage device 103 linked to the door handle is provided in the lock body 1. The clutch piece 10301 of the manual pull-back linkage device 103 is connected to the return groove 10105 on the right part of the lock tongue 101 to realize the manual return of the lock tongue 101. The lock tongue 101 adopts a cylindrical tongue end 10107, and the tongue end 10107 is equipped with an inner-tongue magnetic device 104. The lock box 2 is equipped with an inner-box magnetic device 201 at a position corresponding to the lock tongue 101. An automatic lock tongue retraction device 105 is provided in the lock body 1. After the door leaf is opened, when the inner-tongue magnetic device 104 is disengaged from the inner-box magnetic device 201, the automatic lock tongue retraction device 105 drives the lock tongue 101 to retract automatically.

[0023] In order to better reduce the noise when closing the door, a lock tongue cavity 202 is provided on the right side of the magnetic device 201 in the box. Anti-collision and noise-reducing cotton 203 is provided in the lock tongue cavity 202 to reduce the friction and touch noise of the lock tongue 101 when entering. It has a sound-reducing effect and can better reduce the friction and touch noise of the lock tongue 101 entering the lock tongue cavity 202 when closing the door.

[0024] To achieve the installation and protection of the inner-tongue magnetic device 104, the lock tongue 101 includes a tongue body 10101 and a blocking member 10102. The left end of the tongue body 10101 is provided with a tongue cavity 10103, and the inner-tongue magnetic device 104 is disposed in the tongue cavity 10103. The tongue body 10101 is provided with a mounting hole on the right side of the tongue cavity 10103 for inserting the inner-tongue magnetic device 104 into the tongue cavity 10103. The blocking member 10102 is inserted into the mounting hole and secured. This effectively achieves the installation and protection of the inner-tongue magnetic device 104.

[0025] In order to make the lock tongue 101 easier to manufacture and maintain, the tongue body 10101 is a single-part structure. Compared with the traditional tongue body 10101 structure composed of multiple parts, the single-part overall structure is simpler and stronger, does not require a complicated assembly manufacturing process, and is easy to manufacture and maintain.

[0026] To enhance the integrity of the blocking piece 10102 and the tongue 10101, the blocking piece 10102 and the tongue 10101 are integrated into one body via a snap-fit ​​structure. The snap-fit ​​structure allows for quick and secure assembly, enhancing the integrity of the blocking piece 10102 and the tongue 10101, making the overall structure appear simpler and more stable.

[0027] To achieve a better guiding effect, a wear-resistant, self-lubricating plastic guide sleeve 106 is installed on the guide plate 102 at the position corresponding to the lock tongue 101. The tongue body 10101 slides in conjunction with the plastic guide sleeve 106. The tongue body 10101 and the blocking member 10102 are made of the same plastic material as the plastic guide sleeve 106. The wear-resistant, self-lubricating plastic material and the guiding structure provide excellent guiding effect for the tongue body 10101, effectively reducing guiding friction.

[0028] To achieve better guidance, symmetrical guide ribs 10104 are provided on the left and right sides or the upper and lower sides of the tongue end 10107. The guide ribs 10104 have a small guiding slope. By providing symmetrical guide ribs 10104 with a small slope, the guidance accuracy is increased, the directional guidance effect is improved, and a better guidance and quieting effect can be achieved.

[0029] To simplify the structure of the automatic retraction mechanism for tongue 10101 and reduce costs, a torsion spring is used. One end of the torsion spring's torsion arm engages with a slot 10106 in the center of tongue 10101, while the other end engages with the lower right end of a plastic guide sleeve 106 within lock body 1. The spring body of the torsion spring passes through its center hole and fits over a column 107 provided on lock body 1. The elasticity of the torsion spring enables automatic retraction of lock tongue 101. When the door is opened, the spring's elasticity retracts lock tongue 101, preventing it from colliding with the door frame when the door is closed. Using a torsion spring to achieve retraction results in a simple structure and low cost.

[0030] The return groove 10105 and the locking groove 10106 are both directly generated integrally on the tongue body 10101 of a single part when the tongue body 10101 is molded and manufactured.

[0031] In this example, the plastic guide sleeve 106 , the tongue 10101 and the blocking piece 10102 are all made of PA46. The magnetic device 201 in the box is set in a plastic protective shell 204 made of PA46 material, and the plastic protective shell 204 is fixed in the lock box 2 .

[0032] During use, when the door leaf is in the open state, the lock tongue 101 is in the retracted state. When the door leaf is closed, only when the door leaf is completely in contact with the door frame, the lock tongue 101 is then smoothly sucked out by the inner magnetic device 104 along the plastic guide sleeve 106 inside the lock box 2 on the door frame, achieving collision-free and silent locking. When the door leaf is opened, the manual retraction linkage 103 is driven by the door handle. The manual retraction linkage 103 drives the lock tongue 101 to move via the clutch plate 10301, disconnecting the magnetic device and retracting the lock tongue 101, achieving collision-free and silent unlocking. At the same time, because the locked lock tongue 101 is strongly attracted to the lock tongue cavity 202 of the lock box 2 on the door frame, combined with the advantages of the cylindrical structure, it effectively prevents abnormal opening such as external card insertion, thereby improving the security performance of the anti-theft door.

[0033] The magnetic silent lock for anti-theft doors shown above is a specific embodiment of the present invention, which has reflected the outstanding substantial features and significant progress of the present invention. According to actual usage needs and under the guidance of the present invention, equivalent modifications can be made to its shape, structure, etc., which are all within the scope of protection of this scheme.

Claims

1. A magnetic silent lock for anti-theft doors, comprising a lock body located on a door leaf and a lock box located on a door frame, the lock body being provided with a lock tongue and a guide plate, and a manual retraction linkage device that is linked to a door handle, characterized in that: The lock tongue adopts a cylindrical tongue end portion, the tongue end portion is built with an inner tongue magnetic device, the position corresponding to the lock tongue in the lock box is built with an inner box magnetic device, and the lock body is provided with an automatic lock tongue retraction device.

2. The anti-theft door magnetic silent lock according to claim 1, characterized in that: A lock tongue cavity is provided on the right side of the magnetic attraction device in the box, and anti-collision and sound-absorbing cotton is provided in the lock tongue cavity to reduce friction when the lock tongue enters and the lock tongue touching noise.

3. The anti-theft door magnetic silent lock according to claim 2, characterized in that: The lock tongue includes a tongue body and a blocking piece. A tongue cavity is provided at the left end of the tongue body. The tongue inner magnetic device is provided in the tongue inner cavity. A mounting hole for placing the tongue inner magnetic device into the tongue inner cavity is provided on the right side of the tongue inner cavity on the tongue body. The blocking piece is inserted into the mounting hole and fixed.

4. The anti-theft door magnetic silent lock according to claim 3, characterized in that: The tongue body is a single-part structure.

5. The anti-theft door magnetic silent lock according to claim 4, characterized in that: The blocking piece and the tongue body are integrated into one body through a snap-fit ​​structure.

6. The anti-theft door magnetic silent lock according to claim 5, characterized in that: A wear-resistant self-lubricating plastic guide sleeve is provided on the guide piece at a position corresponding to the lock tongue. The tongue body and the plastic guide sleeve are slidably matched. The tongue body and the blocking piece are made of the same plastic material as the plastic guide sleeve.

7. The anti-theft door magnetic silent lock according to claim 6, characterized in that: Symmetrical guide ribs are provided on the left and right sides or the upper and lower sides of the tongue end, and the guide ribs have a small-angle guide slope.

8. The anti-theft door magnetic silent lock according to claim 7, characterized in that: The clutch piece of the manual retraction linkage device is connected to the retraction groove on the right part of the tongue body to realize the manual retraction of the lock tongue.

9. The anti-theft door magnetic silent lock according to claim 8, characterized in that: The automatic retraction device of the lock tongue adopts a torsion spring. The torsion arm at one end of the torsion spring is clamped in the slot in the middle of the tongue body, and the torsion arm at the other end of the torsion spring is clamped in the lower right end of the plastic guide sleeve in the lock body. The spring body of the torsion spring is sleeved on the column shaft set on the lock body through its center hole.

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