A minimalist three-bar lock

Abstract

This invention discloses a minimalist three-bar lock, which includes a front handle assembly and a rear handle assembly. The front handle assembly is installed on the outside of the door, and the rear handle assembly is installed on the inside of the door. The front handle assembly and the rear handle assembly are arranged opposite to each other and connected through the door by a connecting shaft assembly, thereby realizing bidirectional linkage operation between the front handle assembly and the rear handle assembly. The connecting shaft assembly includes a first bidirectional locking square tube, a second bidirectional locking square tube, and a connecting lock ruler. The first bidirectional locking square tube is connected to the middle of the front handle assembly, the second bidirectional locking square tube is connected to the middle of the rear handle assembly, and the connecting lock ruler is connected between the first bidirectional locking square tube and the second bidirectional locking square tube. By symmetrically arranging the front and rear handle assemblies and combining them with the connecting shaft assembly, a bidirectional linkage transmission structure is achieved. The front handle uses key transmission to unlock and lock, while the rear handle uses downward pressing and upward pulling to achieve the same unlocking and locking functions. The indicator ring drives the cat head through the rear handle, and the cat head then transmits the signal to indicate whether the lock is unlocked (red for closed, green for open). The overall structure is more concise and compact, reducing the number of parts and assembly levels while improving the reliability and aesthetics of the lock.

Description

Technical Field

[0001] This invention belongs to the field of lock technology, specifically relating to a minimalist three-bar lock. Background Technology

[0002] Door locks, as crucial components of doors used for opening, closing, and security, are widely used in residential doors, interior doors, and various functional doors. Existing door lock products typically employ a structure with front and rear handles, a lock cylinder, and a transmission mechanism. Opening, closing, and locking / unlocking functions are achieved by turning the handle or operating the deadbolt assembly. With architectural styles trending towards minimalism, the market demands higher standards for door locks in terms of aesthetics, compact structure, and smooth operation.

[0003] However, most existing door locks still have problems in structural design, such as a large number of parts, complex internal structure, and cumbersome assembly steps. In particular, the transmission structure between the front and rear handles and the setting of the deadbolt mechanism often require multiple sets of connecting parts and limiting structures to cooperate. This not only increases manufacturing and assembly costs, but also makes it easy for problems such as poor return, poor feel, or decreased reliability to occur during long-term use due to poor structural fit.

[0004] In addition, some door locks have problems with concentrated force, unstable positioning, or insufficient buffering in their deadbolt structure design, which can easily lead to unsmooth deadbolt operation and affect the user experience. Summary of the Invention

[0005] In view of the technical problems mentioned in the background art, the purpose of this invention is to provide a minimalist three-bar lock to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a minimalist three-bar lock, comprising a front handle assembly and a rear handle assembly. The front handle assembly is installed on the outside of the door, and the rear handle assembly is installed on the inside of the door. The front handle assembly and the rear handle assembly are arranged opposite to each other and connected through the door via a connecting shaft assembly, thereby realizing bidirectional linkage operation between the front handle assembly and the rear handle assembly. The connecting shaft assembly includes a first bidirectional locking square tube, a second bidirectional locking square tube, and a connecting lock ruler. The first bidirectional locking square tube is connected to the middle of the front handle assembly, the second bidirectional locking square tube is connected to the middle of the rear handle assembly, and the connecting lock ruler is connected between the first bidirectional locking square tube and the second bidirectional locking square tube.

[0007] The present invention has the following main advantages: The minimalist three-bar lock described in this invention achieves a bidirectional linkage transmission structure through the symmetrical arrangement of the front handle assembly and the rear handle assembly, combined with the connecting shaft assembly, making the overall structure more concise and compact. While reducing the number of parts and assembly levels, it significantly improves the overall stability and reliability of the lock. Through the cooperation of the first bidirectional locking square tube, the second bidirectional locking square tube and the connecting lock ruler, the front and rear handles can achieve synchronous linkage when operated on either side. With the help of the first square tube return spring and the second square tube return spring, the handle can automatically and stably return to the initial position after release, effectively avoiding the problem of handle sagging or poor return, and improving the user experience. The front and rear handle assemblies adopt a connection method combining butt joint internal studs, butt joint through pins and connecting threaded tubes, and are fixed by countersunk screws. This connection structure has the dual effects of threaded locking and plug-in limiting, making the connection firm and reliable. It is not easy to loosen during long-term repeated use, and has good anti-torsion and anti-vibration performance. The overall structure design is compact, the installation method is universal, the adaptability is strong, and it is convenient for production and assembly. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0009] Figure 2 This is a schematic diagram of the overall exploded structure of the present invention.

[0010] Figure 3 This is an exploded view of the front handle assembly of the present invention.

[0011] Figure 4 This is an exploded view of the rear handle assembly of the present invention.

[0012] Figure 5 This is an exploded structural diagram of the connecting dental tube of the present invention.

[0013] Figure 6 This is a schematic diagram of the front steel cover structure of the present invention.

[0014] Figure 7 This is a schematic diagram of the rear steel cover structure of the present invention.

[0015] Reference numerals: Front handle assembly 10; Rear handle assembly 20; Connecting shaft assembly 30; First two-way locking square tube 31; Second two-way locking square tube 32; Connecting lock ruler 33; First square tube return spring 34; Second square tube return spring 35; First shaft retaining spring 341; Second shaft retaining spring 351; Front handle 11; Front steel cover 12; First docking mounting bracket 121; Dating internal stud 122; Rear handle 21; Rear steel cover 22; Second docking mounting bracket 221; Dating through post 222 ; Connecting thread tube 40; Countersunk screw 41; Lock cylinder 13; Large deadbolt accessory 14; Front deadbolt AB piece 15; Large accessory spring 141; Small deadbolt accessory 142; Limiting ball 143; Front cover mounting ring 123; Front return spring 16; Front limit pressure cap 17; Front steel washer 171; Rear deadbolt AB piece 23; Rear cover mounting ring 223; Rear limit pressure cap 24; Rear return spring 25; Rear steel washer 241; First handle rubber washer 151; Second handle rubber washer 231. Detailed Implementation

[0016] like Figures 1 to 7 As shown, a minimalist three-bar lock includes a front handle assembly 10 and a rear handle assembly 20. The front handle assembly 10 is installed on the outside of the door, and the rear handle assembly 20 is installed on the inside of the door. The front handle assembly 10 and the rear handle assembly 20 are connected to each other and are connected through the door through a connecting shaft assembly 30, thereby realizing the linkage operation of the front handle assembly 10 and the rear handle assembly 20.

[0017] In practical implementation, the connecting shaft assembly 30 includes a first bidirectional locking square tube 31, a second bidirectional locking square tube 32, and a connecting lock ruler 33. The first bidirectional locking square tube 31 is connected to the middle of the front handle assembly 10, the second bidirectional locking square tube 32 is connected to the middle of the rear handle assembly 20, and the connecting lock ruler 33 connects between the first bidirectional locking square tube 31 and the second bidirectional locking square tube 32 to achieve a transmission connection between the front handle assembly 10 and the rear handle assembly 20. A first square tube return spring 34 is sleeved on the outer side of the first bidirectional locking square tube 31, and a second square tube return spring 35 is sleeved on the outer side of the second bidirectional locking square tube 32. A first shaft retaining circlip 341 is provided at the end of the first square tube return spring 34, and a second shaft retaining circlip 351 is provided at the end of the second square tube return spring 35. The first shaft retaining circlip 341 and the second shaft retaining circlip 351 are used to axially limit and fix the corresponding return springs to prevent axial movement of the return springs during use. With the above structural design, when either handle assembly is rotated, the first bidirectional locking square tube 31 or the second bidirectional locking square tube 32 rotates synchronously under the drive of the connecting locking ruler 33, thereby realizing bidirectional linkage operation between the front handle assembly 10 and the rear handle assembly 20. After the handle is released, the first square tube return spring 34 and the second square tube return spring 35 apply a return spring force to the first bidirectional locking square tube 31 and the second bidirectional locking square tube 32 respectively, causing the front handle assembly 10 and the rear handle assembly 20 to automatically return to their initial positions, thereby ensuring stable return of the handle after each operation, improving the feel and reliability of use.

[0018] In practical implementation, the front handle assembly 10 includes a front handle 11 and a front steel cover 12, wherein the front steel cover 12 is installed at the front end of the front handle 11. A first docking mounting bracket 121 is installed inside the front steel cover 12, which provides docking space for the connecting parts of the rear handle assembly. Dating internal studs 122 are respectively provided on both sides of the first docking mounting bracket 121 for connection with the docking through studs 222 of the rear handle assembly, ensuring a secure fixation between the front and rear handle assemblies. The rear handle assembly 20 includes a rear handle 21 and a rear steel cover 22, which is installed at the front end of the rear handle 21. A second docking mounting bracket 221 is installed inside the rear steel cover 22, which also serves a docking connection function and is similar in design to the first docking mounting bracket 121. Dating through studs 222 are respectively connected to both sides of the second docking mounting bracket 221 for connection with the docking internal studs 122 in the front handle assembly, achieving reliable docking between the front and rear handle assemblies. A connecting threaded tube 40 connects the internal threaded stud 122 and the through-bolt 222. The front end of the connecting threaded tube 40 is tightly threaded into the internal threaded stud 122, ensuring the transmission linkage between the two handle assemblies during locking. The connecting threaded tube 40 is inserted into the through-bolt 222, ensuring the stability of the connection and transmitting torque during operation. A countersunk screw 41 passes through the through-bolt 222 and is fixedly connected to the connecting threaded tube 40. The countersunk screw 41 design ensures a flat and unprotruding connection during assembly, avoiding interference in actual use and effectively preventing loosening or slippage. Through this structural design, the front handle assembly 10 and the rear handle assembly 20 are stably connected via the connecting threaded tube 40 and threaded connection. The advantage of this design is that the matching structure of the internal threaded stud 122 and the through-bolt 222 makes the connection between the front and rear handle assemblies tighter and more stable. The connecting threaded tube 40 not only serves as a connecting component but also transmits torque and maintains the stability of the front and rear handle assemblies. The connecting threaded tube 40 is connected to the mating internal stud 122 via threads, and engages with the mating through post 222 via a plug-in connection, ensuring no loosening during operation and providing good transmission efficiency. The use of countersunk screws 41 further enhances the stability of the connection, preventing loosening of the connecting parts due to external forces during use.

[0019] In practical implementation, a lock cylinder 13 is installed at the front end of the front handle 11. The lock cylinder 13 is used to open or close the lock with a key and cooperates with the transmission structure inside the lock body. A deadbolt fitting 14 is installed at the front end of the lock cylinder 13. The deadbolt fitting 14 is used to transmit and control the deadbolt function. A front deadbolt AB plate 15 is installed at the front end of the deadbolt fitting 14. The front deadbolt AB plate 15 is used to switch between the deadbolt state and the non-deadbolt state. A large fitting spring 141 is provided between the large fitting spring 14 and the deadbolt fitting 14. The large fitting spring 141 is used to apply an elastic restoring force to the front deadbolt AB plate 15, so that the front deadbolt AB plate 15 is held in the initial position when no external force is applied, thereby ensuring the stability and reliability of the deadbolt mechanism. When performing the deadbolt operation, the key drives the lock cylinder 13 to rotate, causing the deadbolt component 14 to rotate accordingly. This, in turn, causes the front deadbolt AB plate 15 to move against the elastic force of the component spring 141, thus switching the deadbolt state. When the deadbolt is released, the component spring 141 releases its elastic force, pushing the front deadbolt AB plate 15 back to its original position, so that the deadbolt component 14 and the lock cylinder 13 return to their initial state.

[0020] In practical implementation, a small deadbolt component 142 is installed at the front end of the large deadbolt component 14. This small deadbolt component 142 works in conjunction with the large deadbolt component 14 to precisely switch and maintain the deadbolt state. Limiting beads 143 are provided on both sides of the small deadbolt component 142. These limiting beads 143 are partially embedded within the small deadbolt component 142 and can make limited displacement in the radial direction. A corresponding limiting hole or limiting cavity is provided within the small deadbolt component 142. The limiting beads 143 extend or retract under the constraint of the limiting hole or limiting cavity, forming a limiting engagement with adjacent structures.

[0021] In practical implementation, the front steel cover 12 has an annular front cover mounting ring 123 protruding from its inner center. This front cover mounting ring 123 extends axially forward for mounting and limiting the front-end components. A front return spring 16 is sleeved on the outer side of the front cover mounting ring 123. One end of the front return spring 16 abuts against the inner side of the front steel cover 12, and the other end abuts against the cooperating front limiting cover 17, providing axial return force for the front-end deadbolt and related lock cylinder components. The front limiting cover 17 is mounted at the front end of the front cover mounting ring 123, and a front steel gasket 171 is mounted at the front end of the front limiting cover 17. The front steel gasket 171 is positioned between the front limiting cover 17 and the lock cylinder 13 or deadbolt components, serving to isolate, resist wear, and distribute stress, thereby reducing direct friction between metal parts and improving the durability and overall service life of the front-end structure. Through the above structural design, the front return spring 16 can provide a stable reset function after the deadbolt operation or the lock cylinder is rotated, ensuring that the deadbolt assembly and lock cylinder automatically return to the initial position after the operation is completed, thereby ensuring smooth operation and reliable positioning of the deadbolt mechanism, and further improving the stability and security of the overall structure of the minimalist three-bar lock.

[0022] In practical implementation, a rear deadbolt AB piece 23 is installed at the front end of the rear handle 21. This rear deadbolt AB piece 23 cooperates with the front deadbolt structure to switch between deadbolt and unlocking functions. The rear deadbolt AB piece 23 can rotate with the rear handle 21 within a predetermined angle range and restricts handle operation in the deadbolt state. An annular rear cover mounting ring 223 protrudes from the inner center of the rear steel cover 22. This rear cover mounting ring 223 extends axially forward and is used to install and limit the rear deadbolt and reset components. A rear limiting pressure cover 24 is installed at the front end of the rear handle 21. This rear limiting pressure cover 24 cooperates with the rear cover mounting ring 223 to axially limit and fix the internal components at the rear end. A rear return spring 25 is sleeved on the outer side of the rear cover mounting ring 223. One end of the rear return spring 25 abuts against the inner side of the rear steel cover 22, and the other end abuts against the rear limiting cover 24. It is used to apply a reset spring force to the rear deadbolt AB piece 23 and related moving parts after the operating force of the rear handle 21 is released, so that it automatically returns to the initial position. A rear steel gasket 241 is installed at the front end of the rear limiting cover 24. The rear steel gasket 241 is disposed between the rear limiting cover 24 and the rear deadbolt AB piece 23 or the rear handle 21. It is used to play a role in wear resistance, isolation and buffering, thereby reducing direct friction between metal parts and improving the stability and service life of the rear deadbolt structure.

[0023] In practical implementation, the edge of the front deadbolt AB plate 15 is provided with a first handle rubber pad 151. The first handle rubber pad 151 is made of elastic material and is provided along the circumference or partial edge of the front deadbolt AB plate 15. It is used to buffer, dampen shock and prevent wear when the front deadbolt AB plate 15 contacts adjacent metal parts. The edge of the rear deadbolt AB plate 23 is provided with a second handle rubber pad 231. The structure of the second handle rubber pad 231 corresponds to that of the first handle rubber pad 151. It is also used to form an elastic contact between the rear deadbolt AB plate 23 and the rear handle 21 or the rear steel cover 22, thereby reducing the noise generated during operation and improving the feel of the deadbolt operation.

[0024] When in use, with the door in the unlocked state, the user can rotate either the front handle assembly 10 or the rear handle assembly 20 from the outside or inside of the door. At this time, the front handle assembly 10 or the rear handle assembly 20 drives the connecting shaft assembly 30 to rotate, causing the first two-way locking square tube 31 and the second two-way locking square tube 32 to rotate synchronously under the transmission action of the connecting lock ruler 33. This transmits the rotational torque to the three-bar locking assembly inside the lock body, driving the three locking bars to extend or retract simultaneously, thus achieving the locking or unlocking operation of the door. After the handle is rotated and released, the first square tube return spring 34 and the second square tube return spring 35 apply a return force to the first two-way locking square tube 31 and the second two-way locking square tube 32 respectively, causing the front handle assembly 10 and the rear handle assembly 20 to automatically return to their initial positions. This ensures stable return of the handle after operation, prevents handle sagging, and improves the overall feel and reliability. When a deadbolt operation is required, the user drives the lock cylinder 13 to rotate using the key, causing the large deadbolt component 14 to rotate accordingly. This, in turn, causes the front deadbolt AB plate 15 to displace over the spring force of the large component spring 141. Simultaneously, the small deadbolt component 142, with the assistance of the limiting ball 143, achieves precise positioning of the deadbolt position, thus ensuring the deadbolt mechanism remains stably in the deadbolt state. In the deadbolt state, the front deadbolt AB plate 15 and the rear deadbolt AB plate 23 engage, restricting the rotation of the front handle assembly 10 and / or the rear handle assembly 20, rendering the handle operation ineffective. This prevents the door from being accidentally opened by turning the handle in the deadbolt state, effectively improving the door's security performance. When the deadbolt is released, the user turns the key in the opposite direction. The large deadbolt component 14 drives the front deadbolt AB piece 15 to move in the opposite direction. Under the elastic action of the large component spring 141, the front deadbolt AB piece 15 and the small deadbolt component 142 automatically return to their original positions. At the same time, the rear return spring 25 and the front return spring 16 apply a reset force to the rear deadbolt AB piece 23 and the front deadbolt assembly, respectively, so that the entire deadbolt system returns to the non-deadbolt state and the handle assembly regains its normal opening and closing function.

Claims

1. A minimalist three-bar lock, characterized in that, It includes a front handle assembly (10) and a rear handle assembly (20). The front handle assembly (10) is installed on the outside of the door and the rear handle assembly (20) is installed on the inside of the door. The front handle assembly (10) and the rear handle assembly (20) are arranged opposite to each other and connected through the door through a connecting shaft assembly (30), thereby realizing bidirectional linkage operation between the front handle assembly (10) and the rear handle assembly (20). The connecting shaft assembly (30) includes a first bidirectional locking tube (31), a second bidirectional locking tube (32) and a connecting lock ruler (33). The first bidirectional locking tube (31) is connected to the middle of the front handle assembly (10), the second bidirectional locking tube (32) is connected to the middle of the rear handle assembly (20), and the connecting lock ruler (33) is connected between the first bidirectional locking tube (31) and the second bidirectional locking tube (32).

2. The minimalist three-bar lock according to claim 1, characterized in that, The first bidirectional locking square tube (31) is fitted with a first square tube return spring (34) on its outer side, and the second bidirectional locking square tube (32) is fitted with a second square tube return spring (35) on its outer side. The end of the first square tube return spring (34) is provided with a first shaft retaining ring (341), and the end of the second square tube return spring (35) is provided with a second shaft retaining ring (351), which are used to axially limit the corresponding return springs so that the front handle assembly (10) and the rear handle assembly (20) automatically return to their original positions after operation release.

3. The minimalist three-bar lock according to claim 1, characterized in that, The front handle assembly (10) includes a front handle (11) and a front steel cover (12). The front steel cover (12) is installed at the front end of the front handle (11). A first docking mounting bracket (121) is installed inside the front steel cover (12). The first docking mounting bracket (121) has docking internal studs (122) on both sides.

4. A minimalist three-bar lock according to claim 3, characterized in that, The rear handle assembly (20) includes a rear handle (21) and a rear steel cover (22). The rear steel cover (22) is installed at the front end of the rear handle (21). A second docking mounting bracket (221) is installed inside the rear steel cover (22). The second docking mounting bracket (221) has docking through posts (222) on both sides.

5. A minimalist three-bar lock according to claim 4, characterized in that, A connecting threaded tube (40) is connected between the internal threaded stud (122) and the through thread (222). The front end of the connecting threaded tube (40) is threaded into the internal threaded stud (122). The connecting threaded tube (40) is inserted into the through thread (222) and passes through the through thread (222) with a countersunk screw (41) and is connected and fixed to the connecting threaded tube (40).

6. A minimalist three-bar lock according to claim 1, characterized in that, The front handle (11) is equipped with a lock cylinder (13) at its front end. The front end of the lock cylinder (13) is equipped with a deadbolt fitting (14). The front end of the deadbolt fitting (14) is equipped with a front deadbolt AB piece (15). A large fitting spring (141) is provided between the front deadbolt AB piece (15) and the deadbolt fitting (14) to provide elastic restoring force to the lock cylinder (front deadbolt AB piece).

7. A minimalist three-bar lock according to claim 6, characterized in that, The front end of the large locking component (14) is equipped with a small locking component (142). The small locking component (142) has a limiting ball (143) on each side. The limiting ball (143) moves within the small locking component (142) to achieve the positioning and maintenance of the locked and unlocked states.

8. A minimalist three-bar lock according to claim 7, characterized in that, The front steel cover (12) has an annular front cover mounting ring (123) protruding from the inner center. A front reset spring (16) is sleeved on the outer side of the front cover mounting ring (123). A front limit cover (17) is installed at the front end of the front cover mounting ring (123). A front steel gasket (171) is installed at the front end of the front limit cover (17).

9. A minimalist three-bar lock according to claim 8, characterized in that, The rear handle (21) is equipped with a rear deadbolt AB piece (23) at the front end. The rear steel cover (22) has an annular rear cover mounting ring (223) protruding from the inner center. The rear return spring (25) is sleeved on the outer side of the rear cover mounting ring (223). The rear limit cover (24) is equipped with a rear limit pressure cover (24) at the front end. The rear steel gasket (241) is equipped with a rear steel pad at the front end of the rear limit pressure cover (24).

10. A minimalist three-bar lock according to claim 9, characterized in that, The edge of the front deadbolt AB piece (15) is provided with a first handle rubber pad (151), and the edge of the rear deadbolt AB piece (23) is provided with a second handle rubber pad (231). Both the first handle rubber pad (151) and the second handle rubber pad (231) are made of elastic material.

Images