Primary-secondary lock

Abstract

The utility model relates to the field of locks, in particular to a primary and secondary lock which comprises a main lock shell, a vertical self-locking groove is formed in the main lock shell, a lock cylinder groove is formed below the vertical self-locking groove, and a fixed lock cylinder is movably connected into the lock cylinder groove. According to the child-mother lock, the lock cylinder groove, the fixed lock cylinder, the transverse self-locking groove, the damping reset rod and the self-locking pin are arranged, so that the fixed lock cylinder cannot be rotated for unlocking only by lifting the key pin at the concave-convex position above the key; the damping reset rod in the transverse self-locking groove in the side face of the fixed lock cylinder enables the five sets of self-locking pins to enter the fixed lock cylinder, and double self-locking formed by the child-mother lock is achieved on the side face, so that after an original key is inserted into the fixed lock cylinder, the key pins are lifted through the uneven surface of the key, and the self-locking function is achieved. The self-locking pin needs to be synchronously pushed out through the uneven side face of the key, and therefore the primary and secondary lock can be unlocked through unlocking at the same time.

Description

Technical Field

[0001] This utility model relates to the field of locks, specifically to a master lock. Background Technology

[0002] A lock is a sealing device attached to objects such as doors, boxes, and drawers, requiring a special key to open. A master lock is one type of lock, consisting of a bolt and two slots. One slot is smaller, called the "female lock," and the other is larger, called the "female lock." The female and male locks can be unlocked with different keys, or simultaneously with the same key. Master locks are generally used on doors in entrance halls, porches, and corridors. Their main function is to provide enhanced security. Because the female and male locks require separate keys, they prevent unauthorized unlocking by unauthorized individuals, thus protecting home security.

[0003] A search revealed a lock with publication number CN213234587U that allows for both forward and reverse rotation, serving two functions. Specifically, this lock includes a lock body, a master key, and an emergency key. The lock body comprises a lock shell, an inner sleeve, and a lock cylinder. The inner sleeve is fixedly installed within the lock shell, and the lock cylinder is located within the inner sleeve. The lock cylinder includes a cylinder body and inserts. The cylinder body has multiple insert slots, each containing an insert. Each insert includes a first insert and a second insert. The first insert has a first limiting portion, and the second insert has a second limiting portion. This lock, through its innovative lock body structure, allows the master key and emergency key to rotate in both directions. Forward rotation enables normal mechanical unlocking, while reverse rotation assists in emergency unlocking, thereby reducing manufacturing costs.

[0004] The aforementioned patent uses only a lock shell, inner sleeve, lock cylinder, lock cylinder body, and insert to enable the master key and emergency key to rotate in the forward and reverse directions, respectively. Forward rotation enables normal mechanical unlocking, while reverse rotation assists the combination lock in emergency unlocking, thereby reducing manufacturing costs. However, in use, this master lock relies on individual pins and inserts to achieve its self-locking and anti-theft function. This structure is too simplistic and its self-locking capability is relatively weak. Individual pins cannot adequately provide anti-theft functionality for the master lock, making it inconvenient for use on valuables or doors, and it is easily cracked by thieves.

[0005] Therefore, it is necessary to invent a mother-daughter lock to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a double-locking function for the lock, which achieves simultaneous unlocking of the key pin and the self-locking pin through a lock cylinder groove, a fixed lock cylinder, a horizontal self-locking groove, a damping reset rod, and a self-locking pin. Compared with a single pin tumbler lock cylinder, the fixed lock cylinder strengthens the internal structure of the lock, improves the anti-theft capability for valuables and doors, reduces the probability of thieves breaking it, and increases the utilization rate of the lock. This solves the problem that the existing locks, which rely on individual pins and inserts to achieve the self-locking and anti-theft function, have a simple structure and weak self-locking capability. Individual pins cannot fully provide the anti-theft function of the lock, making it inconvenient for use on valuables or doors and easy for thieves to break.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a master lock, comprising a main lock housing, wherein a vertical self-locking groove is provided inside the main lock housing, a lock cylinder groove is provided below the vertical self-locking groove, a fixed lock cylinder is movably connected inside the lock cylinder groove, a horizontal self-locking groove is provided inside the lock cylinder groove, a damping reset rod is fixedly installed inside the horizontal self-locking groove, a self-locking pin is provided at one end of the damping reset rod, a master lock tongue is fixedly installed at one end of the fixed lock cylinder, a torsion groove is provided inside the master lock tongue, a torsion block is movably connected inside the torsion groove, and a master lock head is fixedly installed at one end of the torsion block.

[0008] Preferably, a fixing bolt passes through the exterior of the main lock housing, and one end of the fixing bolt is movably connected to the secondary lock housing.

[0009] Preferably, a fixing steel ball is fixedly installed inside the vertical self-locking groove, a torsion spring is provided at the bottom of the fixing steel ball, an abutment pin is movably connected inside the torsion spring, and a key pin is fixedly installed at the bottom of the abutment pin.

[0010] Preferably, the number of key pins is set to five, and the five key pins are evenly distributed in the main lock housing.

[0011] Preferably, the number of damping reset rods is set to five, and the five damping reset rods are distributed at equal intervals in the lock core groove.

[0012] Preferably, the torsion block fixedly installed on the outside of the lock cylinder engages with the torsion groove opened inside the lock tongue, and the torsion block and the torsion groove are used in conjunction.

[0013] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0014] 1. Through the design of the lock cylinder groove, fixed lock cylinder, horizontal self-locking groove, damping reset rod, and self-locking pin, this lock cannot unlock the fixed lock cylinder by simply lifting the key pin on the uneven surface of the key. The damping reset rod in the horizontal self-locking groove on the side of the fixed lock cylinder allows five sets of self-locking pins to enter the fixed lock cylinder, forming a double self-locking mechanism on the side. Therefore, after inserting the original key into the fixed lock cylinder, it is necessary to not only lift the key pin through the uneven surface of the key, but also push out the self-locking pin through the uneven side of the key. Only by unlocking at the same time can the lock be opened. Compared with a single pin tumbler lock cylinder, the fixed lock cylinder strengthens the internal structure of the lock, improves the anti-theft capability for valuables and doors, reduces the probability of thieves breaking the lock, and increases the utilization rate of the lock.

[0015] 2. Through the design of the main lock housing, fixing bolts, secondary lock housing, bolt and latch, torsion groove, torsion block, and bolt and latch head, when this bolt and latch lock is used for valuable items or long-term use on doors, the fixing bolts enhance the stability and firmness of the connection between the main lock housing and the secondary lock housing. At the same time, the internal structure of the main lock housing is connected by the torsion groove and torsion block, making it easier to operate the bolt and latch head to rotate and unlock. Moreover, the overall structure is simple and convenient for maintenance personnel to repair in time if a fault occurs, without delaying the normal use of the bolt and latch lock. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the secondary lock housing structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the torsion spring structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the self-locking pin structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the male and female locking tongue structure of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Main lock housing; 2. Fixing bolt; 3. Secondary lock housing; 4. Vertical self-locking groove; 5. Lock cylinder groove; 6. Fixing steel ball; 7. Torsion spring; 8. Abutment pin; 9. Key pin; 10. Fixing lock cylinder; 11. Horizontal self-locking groove; 12. Damping reset rod; 13. Self-locking pin; 14. Lock tongue and bolt; 15. Torsion groove; 16. Torsion block; 17. Lock cylinder. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] This utility model provides, for example Figure 1-5 The lock shown includes a main lock housing 1. A vertical self-locking groove 4 is formed inside the main lock housing 1. A lock cylinder groove 5 is formed below the vertical self-locking groove 4. A fixed lock cylinder 10 is movably connected inside the lock cylinder groove 5. A horizontal self-locking groove 11 is formed inside the lock cylinder groove 5. A damping reset rod 12 is fixedly installed inside the horizontal self-locking groove 11. A self-locking pin 13 is provided at one end of the damping reset rod 12. A female and male lock tongue 14 is fixedly installed at one end of the fixed lock cylinder 10. A torsion groove 15 is formed inside the female and male lock tongue 14. A torsion block 16 is movably connected inside the torsion groove 15. A female and male lock head 17 is fixedly installed at one end of the torsion block 16. When the lock is unlocked by lifting the key pin 9 only by the uneven surface above the key, the fixed lock cylinder 10 cannot be rotated and unlocked. The damping reset rod 12 in the horizontal self-locking groove 11 on the side of the fixed lock cylinder 10 allows five sets of self-locking pins 13 to enter the fixed lock cylinder 10, forming a double self-locking mechanism on the side of the lock.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, a fixing bolt 2 passes through the exterior of the main lock housing 1. One end of the fixing bolt 2 is movably connected to the secondary lock housing 3. The fixing bolt 2 enhances the stability and firmness of the connection between the main lock housing 1 and the secondary lock housing 3. A fixing steel ball 6 is fixedly installed inside the vertical self-locking groove 4. A torsion spring 7 is provided at the bottom of the fixing steel ball 6. An abutment pin 8 is movably connected inside the torsion spring 7. A key pin 9 is fixedly installed at the bottom of the abutment pin 8. The fixing steel ball 6 and the torsion spring 7 provide elasticity for the abutment pin 8, facilitating the key pin 9 to perform the first unlocking of the lock with the key.

[0027] like Figure 1 , Figure 4 and Figure 5As shown, the number of key pins 9 is set to five, and the five key pins 9 are evenly distributed in the main lock housing 1. The five sets of key pins 9 increase the complexity of key unlocking and improve the internal structure of the lock. The number of damping reset rods 12 is set to five, and the five damping reset rods 12 are evenly distributed in the lock cylinder groove 5. The damping reset rods 12 are pushed out of the fixed lock cylinder 10 by the uneven side of the key, which is also pressed by the self-locking pin 13. The second unlocking is completed. The torsion block 16 fixedly installed on the outside of the lock head 17 engages with the torsion groove 15 opened inside the lock tongue 14. The torsion block 16 and the torsion groove 15 work together. The inside of the main lock housing 1 is connected by the torsion groove 15 and the torsion block 16, which makes it easier for the lock head 17 to operate the lock tongue 14 to rotate and unlock.

[0028] The working principle of this practical lock is as follows: When opening valuable items or doors using this master lock, first insert the key into the fixed lock cylinder 10 through the keyhole on the side of the main lock housing 1. As the key is inserted, the uneven surface of the key presses against the key pin 9, lifting it up. Then, the abutment pin 8 connected to the key pin 9 is released from the fixed lock cylinder 10 under the contraction of the torsion spring 7. Simultaneously, as the key pin 9 performs its first unlocking operation, the uneven surface of the key also presses against the self-locking pin 13. The damping reset rod 12 is compressed and retracts, exiting the fixed lock cylinder 10, completing the second unlocking. Thus, the fixed lock cylinder 10 is released from its restriction and can be rotated. The key pin 9 and the self-locking pin 13 unlock simultaneously. The purpose of this double-locking mechanism is to enhance the internal structure of the lock compared to a single pin tumbler lock cylinder. This improves the security for valuables and doors, reducing the probability of thieves breaking the lock. After the key is fully inserted into the fixed lock cylinder 10 to unlock, the lock cylinder 10, pushed by the key, engages with the bolt 14 via the twisting groove 15 and twisting block 16. Simply rotating the bolt 14 then completes the opening and locking of the lock. After completing the opening and locking of valuables and doors using the lock, routine maintenance is required. This completes the use of the lock.

[0029] The above description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A master lock, comprising a master lock housing (1), characterized in that: The main lock housing (1) has a vertical self-locking groove (4) inside, and a lock cylinder groove (5) is provided below the vertical self-locking groove (4). A fixed lock cylinder (10) is movably connected inside the lock cylinder groove (5). A horizontal self-locking groove (11) is provided inside the lock cylinder groove (5). A damping reset rod (12) is fixedly installed inside the horizontal self-locking groove (11). A self-locking pin (13) is provided at one end of the damping reset rod (12). A female and male lock tongue (14) is fixedly installed at one end of the fixed lock cylinder (10). A torsion groove (15) is provided inside the female and male lock tongue (14). A torsion block (16) is movably connected inside the torsion groove (15). A female and male lock head (17) is fixedly installed at one end of the torsion block (16).

2. A mother-daughter lock according to claim 1, characterized in that: A fixing bolt (2) passes through the outside of the main lock housing (1), and one end of the fixing bolt (2) is movably connected to the secondary lock housing (3).

3. A mother-daughter lock according to claim 1, characterized in that: A fixing steel ball (6) is fixedly installed inside the vertical self-locking groove (4). A torsion spring (7) is provided at the bottom of the fixing steel ball (6). An abutment pin (8) is movably connected inside the torsion spring (7). A key pin (9) is fixedly installed at the bottom of the abutment pin (8).

4. A mother-daughter lock according to claim 3, characterized in that: The number of key pins (9) is set to five, and the five key pins (9) are evenly distributed in the main lock housing (1).

5. A mother-daughter lock according to claim 1, characterized in that: The number of damping reset rods (12) is set to five, and the five damping reset rods (12) are distributed at equal intervals in the lock core groove (5).

6. A mother-daughter lock according to claim 1, characterized in that: The torsion block (16) fixedly installed on the outside of the lock head (17) engages with the torsion groove (15) opened inside the lock tongue (14), and the torsion block (16) and the torsion groove (15) are used together.

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