Stroke compensation spring bolt mechanism

Abstract

The utility model provides a stroke compensation spring bolt mechanism which comprises a spring bolt, a lock body, a first connecting rod base, a second connecting rod base, a first connecting rod, a second connecting rod and a compression spring. The first connecting rod base is fixed to a center hole in the plane end of the spring bolt. The second connecting rod base is fixed to a lock body plane end center hole. The two ends of the first connecting rod are hinged to the first connecting rod base and the second connecting rod base respectively. The two ends of the second connecting rod are hinged to the first connecting rod base and the second connecting rod base respectively to form a four-connecting-rod mechanism. Vertical folded edges with holes are arranged at the two ends of the compression spring and are respectively fixed on the side surfaces of the spring bolt and the lock body; when the spring bolt is subjected to transverse force, the compression spring is bent and deformed to compensate displacement, and meanwhile the four-connecting-rod mechanism moves along with the spring bolt. When the spring bolt is retracted, the connecting rod mechanism limits the tensile deformation of the spring and drives the spring bolt to reset, so that the transverse impact load on the shaft in the lock body is remarkably reduced while the spring bolt is accurately inserted into the lock box, and the service life of a lock piece is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of automatic bolt lock technology for smart access gates, and in particular to a travel compensation locking tongue mechanism. Background Technology

[0002] For large swing door automatic systems, especially factory or warehouse doors, where sealing is required, tightening the door gaps is a crucial issue. During the process of inserting the electric latch into the lock box, the door is in a stopped state. At this time, the door is affected by wind or external forces, causing the door body to shake. This can result in the latch not being fully aligned with the lock box for insertion, and the large lateral horizontal force received by the latch can easily damage the internal shaft of the lock body. To avoid this situation, the flexibility of the spring and the linkage of the internal connecting rod are used to compensate for the lateral horizontal travel, ensuring the service life of the lock body. Utility Model Content

[0003] The purpose of this utility model is to solve the above-mentioned problems and provide a door lock structure that can ensure that the bolt can still be accurately inserted into the lock box when the door shakes and avoid damage to the internal mechanism.

[0004] To achieve the above objectives, this utility model proposes a stroke-compensating locking tongue mechanism, comprising: a locking tongue, a locking body, a first connecting rod base, a second connecting rod base, a first connecting rod, a second connecting rod, and a compression spring;

[0005] The first connecting rod base is fixed to the center hole at the end of the locking tongue plane by a threaded connection;

[0006] The second connecting rod base is fixed to the center hole at the plane end of the lock body via a threaded connection;

[0007] The two ends of the first connecting rod are respectively hinged to the first connecting rod base and the second connecting rod base by pins;

[0008] The two ends of the second link are hinged to the base of the first link and the base of the second link respectively by pins to form a four-bar linkage, wherein the lengths of the first link and the second link are equal;

[0009] The compression spring has vertical folded edges with holes at both ends, which are fixed to the sides of the latch and the lock body respectively by fasteners;

[0010] When the latch is subjected to lateral force, the compression spring bends to compensate for the displacement, and the four-bar linkage moves accordingly; when the latch is retracted, the linkage restricts the spring from stretching and deforming and drives the latch to reset.

[0011] Furthermore, the folded edge of the compression spring is concentric with the fixing holes of the latch and the lock body, and is locked by screws so that the deformation direction of the spring is linked with the movement direction of the latch.

[0012] Furthermore, in the four-bar linkage, the first and second links are arranged in a spatially intersecting manner, and their lengths limit the extension stroke of the compression spring.

[0013] Furthermore, the lock body is fitted with a waterproof cover, and the lock body can move vertically along the waterproof cover; the waterproof cover is fixed to the door body, and an electric control mechanism for driving the lock body to rise and fall is provided inside it.

[0014] Furthermore, it also includes a lock box, which is fixed to the door frame and corresponds to the position of the waterproof cover. The lock tongue is inserted into the lock box under the drive of the lock body to achieve locking.

[0015] Furthermore, the compression spring has a rectangular structure, which fits tightly against the latch and lock body in the reset state, keeping the latch and lock body in a straight line alignment.

[0016] Furthermore, the compression spring is arranged around the outside of the four-bar linkage consisting of the first link and the second link, forming a nested structure of "outer spring, inner link".

[0017] Furthermore, the lengths of the first and second links are greater than the free height of the compression spring, thus limiting the stretching by the physical length of the links.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] This invention utilizes the flexibility of springs and the linkage of internal rods to construct a dual composite mechanism of springs and rods. Two sets of rods of equal length are hinged at the center of the latch in a spatially intersecting manner, forming a parallelogram kinematic chain (four-bar linkage) hidden inside the spring. When the latch is impacted by wind and shifts laterally, the spring bends and deforms to absorb the displacement. At the same time, the intersecting rods rotate synchronously around the hinge pin, allowing the parallelogram structure to adjust its angle instantaneously. When the external force disappears, the spring releases its rebound force to drive the latch to return to its original position. The maximum unfolding angle of the rods is limited by their own length to prevent the spring from being overstretched and causing plastic deformation.

[0020] This invention utilizes vertically folded edges with holes at both ends of the spring to laterally fix the compression spring to the sides (non-central axis position) of the latch and lock body using fasteners (such as screws). This allows the compression spring to undergo primarily bending deformation when the latch is subjected to lateral horizontal forces (such as door shaking), rather than the stretching or compression deformation found in traditional solutions. This structure effectively absorbs lateral displacement, significantly reducing the lateral impact load transmitted to the internal shaft of the lock body, preventing shaft damage due to deformation. While ensuring the latch can still accurately insert into the lock box when the door shakes, it avoids damage to the internal mechanism and extends the service life of the lock components.

[0021] This invention utilizes two symmetrical linkage bases and two linkages to form a four-bar linkage mechanism. This mechanism effectively achieves follow-up compensation. When the latch is laterally displaced by external force, causing the spring to bend, the four-bar linkage mechanism can freely rotate around the pin, adaptively adjusting the angle without hindering the bending deformation process of the spring, ensuring smooth displacement compensation. When the latch is retracted (external force removed), the linkage mechanism converts the spring's rebound force into a traction force on the latch. More importantly, the rigid length of the linkage itself limits the maximum unfolding angle of the mechanism, physically preventing the spring from being overstretched beyond its elastic limit, effectively protecting the spring from plastic deformation and loss of elasticity. Simultaneously, the mechanism guides the latch back along a predetermined path, achieving reset guidance and limiting.

[0022] This invention integrates a compression spring entirely onto the outside of the four-bar linkage, forming a compact nested layout of "outer spring, inner linkage." This compact layout ensures that the bending deformation space of the spring and the movement space of the linkage do not interfere with each other, achieving integration of functional components. Furthermore, in the reset state, the rectangular structure of the compression spring allows it to fit tightly against the latch and lock body, helping to maintain the latch and lock body in a straight alignment and providing initial accuracy assurance for the next bolt action.

[0023] In this invention, two linkage bases are fixed to the center of the latch and the lock body, respectively, while compression springs are fixed to the sides of the latch and the lock body, forming a misaligned fixing point structure. This misaligned mechanism clearly defines the main functional division of each component: the centrally fixed linkage mechanism is responsible for transmitting motion and providing rigid limiting / guiding, while the laterally fixed springs are responsible for absorbing lateral impact energy. The two components work together spatially and functionally without conflict, jointly achieving a composite function of flexible compensation and rigid reset protection.

[0024] This invention combines a laterally fixed bending spring, a centrally hinged cross parallelogram link, a nested layout of springs and links, and a misaligned fixing structure to comprehensively achieve the core function of effectively compensating for the lateral displacement of the bolt caused by door deformation, wind, or other external forces in electric bolt lock applications. This significantly reduces the risk of damage to key internal components (shafts) of the lock body, improves impact resistance, ensures the bolt can accurately reset after external force, and guarantees reset accuracy. Furthermore, the physical limiting of the link protects the elasticity of the spring, thereby extending the service life of the entire mechanism and enhancing its reliability. Attached Figure Description

[0025] Figure 1 This is an exploded view of the stroke compensation locking tongue mechanism proposed in an embodiment of this utility model;

[0026] Figure 2 This is a schematic diagram of the overall appearance of the stroke compensation locking tongue mechanism proposed in this embodiment of the utility model;

[0027] In the diagram, 1-lock tongue, 2-first link base, 3-first link, 4-compression spring, 5-second link base, 6-lock body, 7-second pin, 8-second link, 9-first pin, 10-waterproof cover, 11-lock box. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be further described below.

[0029] This embodiment proposes a travel compensation locking tongue mechanism, such as Figure 1 and Figure 2 As shown, the locking mechanism includes: a locking tongue 1, a lock body 6, a first link base 2, a second link base 5, a first link 3, a second link 8, and a compression spring 4.

[0030] The latch 1 has a central hole on one side with an inclined surface. The first connecting rod base 2 is fixed to the central hole at the flat end of the latch 1 by a threaded connection. It passes through the central hole on the horizontal cross-section of the latch 1. A screw passes downward through the central hole of the latch and engages with the screw of the first connecting rod base 2 to lock it.

[0031] The lock body 6 has a central hole with internal threads on its plane, and the second connecting rod base 5 is fixed to the central hole at the end of the lock body 6 by thread engagement.

[0032] The first link 3 has fixing holes at both ends that are concentrically corresponding to the first link base 2 and the second link base 5. A pin passes through the fixing holes and is hinged to the first link base 2 and the second link base 5, so that the two sides of the first link 3 can form a rotational link around the pin at the connection point with the first link base 2 and the second link base 5.

[0033] The two ends of the second link 8 are hinged to the concentric holes of the first link base 2 and the second link base 5 through the first pin 9 and the second pin 7, respectively, and the connection method is the same as that of the first link 3.

[0034] In this embodiment, the two sets of links of equal length (the first link 3 and the second link 8) are hinged to the center of the latch 1 in a spatially intersecting manner to form a four-bar linkage mechanism hidden inside the spring 4.

[0035] When the latch 1 is impacted by wind and shifts laterally, the spring 4 bends and deforms to absorb the displacement. At the same time, the four-bar linkage moves accordingly, that is, the cross linkages (first linkage 3 and second linkage 8) rotate synchronously around the hinge pin, so that the parallelogram structure adjusts its angle instantaneously. When the external force disappears, the spring 4 releases its rebound force to drive the latch 1 to retract and reset. The maximum unfolding angle of the linkages (first linkage 3 and second linkage 8) is limited by their own length to prevent the spring from being overstretched and causing plastic deformation.

[0036] like Figure 1 and Figure 2 As shown, the compression spring 4 has a vertically reversed, perforated flange at the end of each of the two spring wires. A connecting hole is provided within the flange, and these connecting holes are concentric with the fixing holes of the latch 1 and lock body 6, respectively. They are secured to the sides of the latch 1 and lock body 6 by screws, ensuring that the spring's deformation direction is linked to the latch's movement direction. The spring 4 can only change direction due to the movement of the lock body 6. In this embodiment, the compression spring 4 has a rectangular structure, and in its reset state, it fits tightly against the latch 1 and lock body 6, maintaining a straight alignment between them.

[0037] Meanwhile, the compression spring 4 is arranged around the outside of the four-bar linkage formed by the first link 3 and the second link 8, forming a nested structure of "outer spring, inner link". In the four-bar linkage, the first link 3 and the second link 8 are arranged in a spatially intersecting manner, and their length limits the extension stroke of the compression spring 4.

[0038] In this embodiment, when the latch 1 is subjected to a lateral force, the compression spring 4 bends and deforms to compensate for the displacement, and the four-bar linkage moves accordingly; when the latch 1 is retracted, the linkage restricts the stretching and deformation of the spring 4 and drives the latch 1 to reset.

[0039] In this embodiment, a waterproof cover 10 is provided on the outside of the lock body 6, and the lock body 6 can move vertically along the waterproof cover 10. The waterproof cover 10 is fixed on the door body, and an electric control mechanism and a limiting mechanism are provided inside to drive the lock body 6 to move up and down. The lock body and other components such as the lock tongue move vertically upward and are inserted into the lock box 11, so that the door body and the door frame are locked.

[0040] In addition, the travel compensation latch mechanism also includes a lock box 11, which is fixed on the door frame and corresponds to the position of the waterproof cover 10. The latch 1 moves along the vertical direction of the lock box 11 under the drive of the lock body 6 until it is inserted into the lock box 11, so that the door body and the door frame are locked together and the door is closed.

[0041] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solution and content of this utility model without departing from the scope of the technical solution of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A travel compensation locking tongue mechanism, characterized in that, include: The lock tongue (1), lock body (6), first link base (2), second link base, first link (3), second link (8) and compression spring (4); The first connecting rod base (2) is fixed to the center hole at the flat end of the locking tongue (1) by a threaded connection; The second connecting rod base is fixed to the center hole at the plane end of the lock body (6) by a threaded connection; The two ends of the first connecting rod (3) are respectively hinged to the first connecting rod base (2) and the second connecting rod base by pins; The two ends of the second link (8) are respectively hinged to the first link base (2) and the second link base by pins to form a four-bar linkage, wherein the first link and the second link have the same length; The compression spring (4) has vertical folded edges with holes at both ends, which are fixed to the sides of the latch (1) and the lock body (6) respectively by fasteners; When the latch (1) is subjected to a lateral force, the compression spring (4) bends and deforms to compensate for the displacement, and the four-bar linkage moves accordingly; when the latch (1) is retracted, the linkage restricts the spring from stretching and deforming and drives the latch to reset.

2. The stroke compensation locking tongue mechanism according to claim 1, characterized in that, The folded edge of the compression spring (4) is concentric with the fixing holes of the latch (1) and the lock body (6), and is tightened by screws so that the deformation direction of the spring is linked with the movement direction of the latch.

3. The travel compensation locking tongue mechanism according to claim 1, characterized in that, In the four-bar linkage, the first link (3) and the second link (8) are arranged in a spatially intersecting manner, and their lengths limit the stretching stroke of the compression spring (4).

4. The stroke compensation locking tongue mechanism according to claim 1, characterized in that, The lock body (6) is covered with a waterproof cover (10), and the lock body (6) can move vertically along the waterproof cover (10); the waterproof cover (10) is fixed to the door body, and an electric control mechanism for driving the lock body (6) to rise and fall is provided inside it.

5. The stroke compensation locking tongue mechanism according to claim 1, characterized in that, It also includes a lock box (11), which is fixed to the door frame and corresponds to the position of the waterproof cover (10). The lock tongue (1) is inserted into the lock box (11) under the drive of the lock body (6) to achieve locking.

6. The stroke compensation locking tongue mechanism according to claim 1, characterized in that, The compression spring (4) has a rectangular structure and fits tightly with the latch (1) and lock body (6) in the reset state, so that the latch and lock body are aligned in a straight line.

7. The stroke compensation locking tongue mechanism according to claim 1, characterized in that, The compression spring (4) is arranged around the outside of the four-bar linkage composed of the first link (3) and the second link (8), forming a nested structure of "outer spring, inner link".

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