Compression tensioning type locking device and crank lock

Abstract

The utility model relates to a compression tensioning type locking device and a crank lock, which comprise a lock box, a lock driving shaft, a lock transmission component and a pre-tensioning locking mechanism, the lock driving shaft drives the lock transmission component, the pre-tensioning locking mechanism comprises a driving gear, a guide component and a pre-tensioning locking component with a lock head, the lock head is arranged towards the top of the lock box, and the lock box is arranged on the guide component. The lock driving shaft drives the driving gear to rotate, the driving gear is in meshing transmission with a rack part of the pre-tightening locking component, the pre-tightening locking component is configured to be capable of moving along a preset track relative to the lock box under the guiding and limiting of the guiding assembly, and the preset track has two moving directions. The pre-tightening locking mechanism comprises a pre-tightening locking component and a pre-tightening locking mechanism, the pre-tightening locking component moves in the two moving directions, the two moving directions are the tightening direction moving in the axial direction of the driving gear and the advancing and retreating direction moving in the extending direction of the rack part, in the process that the lock is switched between the unlocking position and the locking position, the pre-tightening locking component synchronously displaces in the two moving directions, and the pre-tightening locking mechanism is provided with an elastic self-locking assembly. The locking device has the advantages of high-strength locking and reliable locking.

Description

Technical Field

[0001] This utility model relates to the field of lock technology, specifically to a lock device with compression and tightening function on a lock. Background Art

[0002] Existing locks, such as lever locks, involve the following locking process: the handle drives the drive shaft in the lock box to rotate, the drive shaft drives the gear to rotate, the gear drives the linkage, and the linkage drives the bolt to insert into the lock seat on the door frame to complete the locking. The drive shaft is also equipped with a steel bolt, which is pressed against the door frame to enhance the locking ability of the lock. However, since the steel bolt is fixedly installed on the drive shaft and rotates with the drive shaft, there are still situations where the locking strength of the lock cannot meet the requirements of high-strength locking. Utility Model Content

[0003] The purpose of this invention is to overcome the defects of the existing technology and provide a compression-tensioning lock device with high-strength locking and easy operation during the locking process.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A compression-tension locking device includes a lock box, a lock drive shaft, and a lock transmission assembly. The lock drive shaft is rotatably fitted within the lock box and drives the lock transmission assembly. The device is characterized in that a pre-tension locking mechanism is further installed at the bottom of the lock box. The pre-tension locking mechanism includes a drive gear, a guide assembly, and a pre-tension locking member with a lock head. The lock head is positioned towards the top of the lock box. The lock drive shaft drives the drive gear to rotate. The pre-tension locking member has a rack portion, and the drive gear meshes with the rack portion for transmission. The pre-tension locking member is configured within the guide assembly. Under guidance and restriction, the lock head can move relative to the lock box along a predetermined trajectory. This predetermined trajectory has two directions of movement: a tightening direction along the axial direction of the drive gear and a forward / backward direction along the extension direction of the rack. During the switching between the unlocked and locked positions, the pre-tightening locking member is synchronously displaced in both directions of movement. The pre-tightening locking mechanism is equipped with an elastic self-locking component. When the pre-tightening locking mechanism enters the locked state, the elastic self-locking component locks the pre-tightening locking mechanism, and the lock drive shaft operates the elastic self-locking component to complete the unlocking.

[0006] Preferably, after the lock drive shaft operates the elastic self-locking component to complete the unlocking stroke, it drives the pre-tensioned locking mechanism to unlock.

[0007] Preferably, the elastic self-locking assembly includes a locking pin, which is movably mounted on the lock housing along the axial direction of the drive gear. A locking hole is axially formed on the drive gear body. The locking pin has a head that can engage with the locking hole. A self-locking spring is connected to the tail of the locking pin, driving the head of the locking pin into the locking hole. A dial wheel that rotates with the lock drive shaft is mounted on the lock drive shaft. An unlocking finger protrudes from the dial wheel. A clearance groove is provided on the drive gear to avoid the unlocking finger. The locking hole corresponds to the clearance groove. The unlocking finger extends into the clearance groove and engages with the head of the locking pin. The device includes a gear drive unit, and a mating part on the drive gear that is linked and engaged with the gear drive unit. The gear drive unit is an arc-shaped actuation groove extending along the rotation direction of the actuation wheel or a protruding post on the actuation wheel. Correspondingly, the mating part is a protruding post on the drive gear or an arc-shaped actuation groove extending along the rotation direction of the drive gear. The protruding post is inserted into the arc-shaped actuation groove and can slide relative to it. The two end walls of the arc-shaped actuation groove are actuation walls that engage with the pushing action of the protruding post. The stroke of the protruding post sliding relative to the arc-shaped actuation groove is adapted to the stroke of the lock drive shaft operating the elastic self-locking component to complete the unlocking.

[0008] Preferably, during the movement of the lock head from the unlocked position to the locked position, in the tension direction of the predetermined trajectory, before the downward locking stroke of the lock head approaching the locked position, there is also a lifting and unfolding stroke of the lock head away from the locked position.

[0009] Preferably, the guide assembly includes a guide rocker arm and a guide groove. The guide groove is arc-shaped. One end of the guide rocker arm is pivotally mounted on the lock box, and the other end of the guide rocker arm is hinged to the pre-tightening locking member. The pre-tightening locking member is provided with a guide pin, which guides and fits in the guide groove.

[0010] Preferably, the pre-tightening locking component includes a U-shaped main frame, a lock head installed at one end of the U-shaped main frame, a rack portion provided on at least one transverse wall panel of the U-shaped main frame, a protrusion inserted into the U-shaped main frame on the lock box, a drive gear provided on the bottom of the protrusion, and guide components provided on both transverse sides of the U-shaped main frame.

[0011] Preferably, the bottom plate of the U-shaped main frame is folded back to form a lock head mounting plate. A lock head bracket is mounted on the lock head mounting plate. The lock head bracket includes an L-shaped plate. The fixing plate of the L-shaped plate has a strip hole extending in the tension direction. The fixing plate of the L-shaped plate is attached to and fastened to the lock head mounting plate by fasteners in an adjustable position. The other plate of the L-shaped plate has a mounting ear. The lock head is a roller mounted on the mounting ear via a wheel axle.

[0012] By adopting the above technical solution, the lock drive shaft drives the lock transmission assembly and simultaneously drives the pre-tensioning locking mechanism. A movable pre-tensioning locking mechanism is used, where the pre-tensioning locking component drives the lock head to move simultaneously in two directions to achieve locking and unlocking. During locking, the lock head extends towards and presses against the door frame. The movement of the lock head in two directions compresses and tightens the door frame, achieving high-strength locking with easy operation. Furthermore, the pre-tensioning locking mechanism is equipped with a self-locking component to ensure it reliably remains in the locked state, preventing the reaction force generated when the lock head presses against the door frame from causing it to retract and resulting in locking failure. The lock head can also be folded and stored more efficiently, offering the advantage of a compact structure.

[0013] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a perspective view of Embodiment 1 of the present utility model;

[0015] Figure 2a This is a diagram showing the lock head of the compression-tensioning locking device in the unlocked position according to Embodiment 1 of this utility model.

[0016] Figure 2b This is a diagram showing the state of the lock head of the compression-tensioning locking device in Embodiment 1 of this utility model at the end of the lifting and unfolding stroke.

[0017] Figure 2c This is a diagram showing the lock head of the compression-tensioning locking device in the locked position according to Embodiment 1 of this utility model.

[0018] Figure 3 This is an exploded view of the compression-tension locking device according to Embodiment 1 of this utility model (the pull rod is omitted in the figure).

[0019] Figure 4 This is a schematic diagram of the structure of Embodiment 1 of this utility model applied to a crank lock;

[0020] Figure 5 for Figure 4 A sectional view taken along line AA.

[0021] Figure 6 This is a schematic diagram of the compression-tension locking device according to Embodiment 2 of this utility model;

[0022] Figure 7 This is a perspective view of the compression-tension locking device according to Embodiment 2 of this utility model;

[0023] Figure 8 This is a schematic diagram of the compression-tension locking device according to Embodiment 3 of this utility model;

[0024] Figure 9This is a schematic diagram of the compression-tension locking device according to Embodiment 4 of this utility model. Figure 1 ;

[0025] Figure 10 This is a schematic diagram of the compression-tension locking device structure according to Embodiment 4 of this utility model;

[0026] Figure 11 This is an exploded view of the compression-tension locking device according to Embodiment 4 of this utility model (the pull rod is omitted in the figure).

[0027] Figure 12 This is a schematic diagram of the assembly structure of the elastic self-locking component in Embodiment 4 of this utility model;

[0028] Figure 13 This is a schematic diagram of the meshing structure of the actuating wheel and the drive gear in Embodiment 4 of this utility model. DETAILED DESCRIPTION

[0029] See appendix Figures 1-5 This utility model discloses a compression-tensioning locking device, including a lock box 1, a lock drive shaft 2, and a lock transmission assembly. The lock drive shaft 2 is rotatably fitted within the lock box 1 and drives the lock transmission assembly. The lock transmission assembly is a conventional component in lock locking devices, such as... Figure 3 and Figure 5The transmission assembly shown for the crank lock employs a gear 31 and a lever 32. Gear 31 is mounted on the lock drive shaft 2, and the rack segment on the lever 32 meshes with gear 31. No corresponding design improvements have been made to the lock transmission assembly, so its specific structure will not be described in detail. A pre-tensioning locking mechanism is also installed at the bottom of the lock housing 1. This mechanism includes a drive gear 4, a guide assembly, and a pre-tensioning locking member 5 with a lock head 51. The lock head 51 faces the top of the lock housing 1. The lock drive shaft 2 drives the drive gear 4 to rotate, pre-tensioning... The pre-tightening locking member 5 has a rack portion 52, and the drive gear 4 meshes with the rack portion 52 for transmission. The pre-tightening locking member 5 is configured to move relative to the lock housing 1 along a predetermined trajectory under the guidance and constraint of the guide assembly. This predetermined trajectory has two movement directions: a tightening direction (Y-axis direction) moving along the axial direction of the drive gear 4 and a forward / backward direction (X-axis direction) moving along the extension direction of the rack portion 52. During the switching between the unlocked and locked positions of the lock head 51, the pre-tightening locking member 5 is synchronously displaced in both movement directions. In the field of locks, the rack portion 52 typically uses a row of holes spaced apart for the teeth of the drive gear 4 to mesh. Due to the meshing transmission between the drive gear 4 and the rack portion 52, the holes can be designed to have a relatively wide dimension along the axial direction of the drive gear 4. During the locking process, the lock drive shaft 2 drives the lock transmission assembly and simultaneously drives the drive gear 4 to rotate. The drive gear 4 is directly fixed to the lock drive shaft 2 to achieve power transmission. The drive gear drives the pre-tightening locking member to move along a predetermined trajectory via the rack. The predetermined trajectory of the pre-tightening locking member is formed by the guidance and restriction of the guide assembly. When locking, the pre-tightening locking member moves towards the door frame along the extension direction of the rack 52, i.e., towards the locking position. At the same time, the lock head 52 finally presses against the door frame to reach the locking position in the axial direction of the drive gear 4. That is, it moves synchronously in two directions, and finally the lock head presses against the door frame to lock. Compared with the traditional rigid bolt design, it has higher locking performance and the locking operation is easy.

[0030] To further ensure a compact structure and allow the lock head to better avoid the door frame, during the movement of the lock head 51 from the unlocked position to the locked position, in the tension direction (Y-axis direction) of the predetermined trajectory, before the downward locking stroke of the lock head 51 approaching the locked position, there is also a lifting and unfolding stroke of the lock head 51 moving away from the locked position. For example... Figures 2a-2c As shown, during the locking process from the unlocked position to the locked position, the lock head first unfolds (moves away from the top surface of the lock housing 1), and then enters the locked position (moves towards the top surface of the lock housing 1). This ensures that when the lock head retracts to a sufficient position, it has a "folding" action towards the lock housing, making the entire structure compact. Therefore, those skilled in the art can conceive of a design where the lock head retains a single pressing locking stroke in the tightening direction.

[0031] To make the pre-tightening locking mechanism operate more stably and reliably, the pre-tightening locking mechanism 5 includes a U-shaped main frame 5-1, with a lock head 51 installed at one end of the U-shaped main frame 5-1. At least one transverse wall plate 5-11 on the U-shaped main frame 5-1 is provided with the rack portion 52. In this specific embodiment, both transverse wall plates 5-11 on the U-shaped main frame 5-1 are provided with rack portions 52, one rack portion 52 is in working state, and the other rack portion is optional, which can meet the forward and reverse installation and use of the pre-tightening locking mechanism. A protrusion 1-1 is provided on the lock box 1 to be inserted into the U-shaped main frame 5-1, and the drive gear 4 is provided on the bottom of the protrusion 1-1. The guide assembly is arranged on both transverse sides of the U-shaped main frame 5-1.

[0032] As a simple and compact design created by the present invention, the guide assembly includes a guide rocker arm 6 and a guide groove 11. The guide groove 11 is arc-shaped. One end of the guide rocker arm 6 is pivotally mounted on the lock box 1, and the other end of the guide rocker arm 6 is hinged to the pre-tightening locking member 5. The pre-tightening locking member 5 is provided with a guide pin 53, which is guided and fitted in the guide groove 11. The guide pin 53 adopts a bolt design that can be detachably installed on the pre-tightening locking member 5. The arc-shaped guide groove enables the pre-tightening locking component to operate smoothly. The action prevents the lock head from swinging around the conductor pin. A guide rocker arm 6 is pivotally connected to each of the two transverse sidewalls of the U-shaped main frame 5-1, and guide grooves 11 are provided on both transverse sidewalls of the protrusion 1-1.

[0033] The bottom plate of the U-shaped main frame 5-1 is folded back to form a lock head mounting plate 5-2, on which the lock head mounting plate 5-2 is mounted. A lock head bracket 5-3 is installed, the lock head bracket 5-3 includes an L-shaped plate, and the fixing plate of the L-shaped plate has a feature extending in the tension direction. The L-shaped plate fixing plate, with its strip hole 5-31, is attached to and secured to the lock head mounting plate 5-2 via adjustable fasteners. The other plate of the template is provided with mounting ears 5-32, and the lock head 51 is a roller mounted on the mounting ears 5-32 via a wheel axle.

[0034] Of course, those skilled in the art, under the substantial guidance of this invention, can also make corresponding modifications to the guiding components, such as... Figure 6 and Figure 7As shown, in another embodiment of the present invention, the guide assembly includes a positioning plate, a first lifting arm 71, and a second lifting arm 72. One end of the first lifting arm 71 and the second lifting arm 72 is hinged to a pre-tightening locking member 5. A lifting plate 55 is provided on the pre-tightening locking member 5. The first lifting arm 71 and the second lifting arm 72 are hinged to the lifting plate 55. The other end of the first lifting arm 71 and the second lifting arm 72 is pivotally mounted on a lock box 1. A positioning interval 12 is provided on the lock box 1 along the extending direction of the rack portion 52. The positioning plate is inserted into the positioning interval 12, wherein the positioning plate is also designed with teeth to form the rack portion 52. The pre-tightening locking member 5 includes a U-shaped main frame, on which a lifting frame is fixed. The lifting plate 55 is provided on the lifting frame. The lock head is bolted to the base plate of the U-shaped main frame 5-1. The aforementioned guide assembly enables the pre-tightening locking member to move along the preset trajectory, but it suffers from the drawback of having numerous parts. Alternatively, the lock head can also be fixed to the base plate of the U-shaped main frame 5-1 with bolts.

[0035] like Figure 8 As shown, in another embodiment of the present invention, the guiding component is... Figure 6 and Figure 7 The main difference in the illustrated embodiment is that the lifting plate 55 and the positioning plate (i.e., the rack portion 52) are integrally formed into a single U-shaped structural member 5-4. Two U-shaped structural members 5-4 are symmetrically arranged on both sides of the lock box 1, and the two U-shaped structural members 5-4 are connected to each other to achieve synchronous operation. The lock head 51 can be a roller directly mounted on the U-shaped structural member 5-4. The above-mentioned guide assembly can realize the movement of the pre-tightened locking member along the preset trajectory, but it suffers from the drawback of having numerous parts.

[0036] like Figures 9-12 As shown, in another embodiment that supplements the invention, a compact structural design can be achieved, and the guiding component is... Figure 6 and Figure 7The main difference in the embodiment shown is that two opposing positioning planes 1-11 are formed on the protrusion 1-1 of the lock box 1. The pre-tightening locking member 5 includes a U-shaped main frame 5-1. The two side frame plates 5-11 of the U-shaped main frame 5-1 are formed with teeth to form a rack portion 52. The guide assembly includes a first lifting rocker arm 71 and a second lifting rocker arm 72. One end of the first lifting rocker arm 71 and the second lifting rocker arm 72 is hinged to the lock box 1. The first lifting rocker arm 71 and the second lifting rocker arm 72 are hinged to the two side frame plates 5-11 of the U-shaped main frame 5-1. The two side frame plates 5-11 also have the function of lifting plates. The inner sidewalls of the two side frame plates 5-11 of the U-shaped main frame 5-1 are positioned and matched with the positioning planes 1-11 to realize the positioning and guidance of the U-shaped main frame, thereby achieving a more simplified and compact structural design. In addition, the U-shaped main frame 5-1 extends to a U-shaped lock head mounting part 5-5. The lock head 51 is positioned and slidably fitted in the frame groove of the U-shaped lock head mounting part 5-5. An adjusting screw 511 is positioned and rotatably fitted on the bottom plate of the U-shaped lock head mounting part 5-5. The adjusting screw 511 is threadedly connected to the lock head 51. The lock head 51 uses a sliding seat block with rollers mounted on it. The sliding seat block is slidably set on the U-shaped lock head mounting part 5-5 by connecting screws.

[0037] Therefore, the above embodiments are not intended to limit the present invention. All equivalent technical solutions made by those skilled in the art under the guidance of the essential spirit of the present invention fall within the protection scope of the present invention.

[0038] like Figures 9-13 As shown, to prevent the reaction force from causing the pre-tensioning locking mechanism to retract and fail to clamp when it enters the locked state, the compression-tensioning locking device has a self-locking function. Specifically, the pre-tensioning locking mechanism is equipped with an elastic self-locking component. When the pre-tensioning locking mechanism enters the locked state, the elastic self-locking component locks the pre-tensioning locking mechanism, and unlocking is completed by operating the elastic self-locking component via the lock drive shaft 2. In this way, when the pre-tensioning locking mechanism enters the locked state, that is, when the lock head 51 is in the locked position, the elastic self-locking component locks the pre-tensioning locking mechanism onto the lock box 1 to ensure reliable locking of the pre-tensioning locking mechanism. Moreover, the unlocking of the elastic self-locking component is operated by the lock drive shaft 2, which is more convenient in operation. Under the guidance of this utility model, those skilled in the art will not find it difficult to understand... Figures 9-13 The elastic self-locking component in the illustrated embodiment can be applied to other embodiments, such as those provided in this utility model. Figures 1-8 The embodiment shown is modified by adding an elastic self-locking component.

[0039] Furthermore, to ensure smooth unlocking of the pre-tensioning locking mechanism, after the lock drive shaft 2 completes the unlocking stroke of the elastic self-locking component, it drives the pre-tensioning locking mechanism to unlock. That is, the elastic self-locking component is unlocked first, and then the lock drive shaft 2 drives the pre-tensioning locking mechanism to move to the unlocked state, i.e., the lock head switches from the locked position to the unlocked position, achieving a step-by-step action, thereby reducing the force required for operation and making it more labor-saving. Therefore, those skilled in the art can conceive of a design where the unlocking actions of the elastic self-locking component and the pre-tensioning locking mechanism overlap; however, this design suffers from the drawback of requiring a relatively large initial unlocking force.

[0040] In this specific embodiment, the elastic self-locking assembly includes a locking pin 4-1, which is axially movably mounted on the lock housing 1 along the drive gear 4. A locking hole 41 is axially formed on the drive gear 4. The locking pin 4-1 has a head 4-11 that can be engaged into the locking hole 41. A self-locking spring 4-2, preferably a coil spring, is connected to the tail of the locking pin 4-1, which drives the head 4-11 into the locking hole 41. A dial 2-1, rotating with the lock drive shaft 2, is mounted on the lock drive shaft 2. The dial 2-1 has a square mounting hole, which fits onto a square shaft segment on the lock drive shaft 2, enabling synchronous rotation of the lock drive shaft and the dial. An unlocking finger 2-11 protrudes from the dial 2-1. A clearance groove 42 is provided on the drive gear 4 to avoid the unlocking finger 2-11. The locking hole 41 corresponds to the clearance groove 42. 2-11 extends into the clearance groove 42 and corresponds to the head 4-11 of the locking pin 4-1. As the dial wheel 2-1 rotates, the unlocking finger 2-11 slides in the clearance groove 42. When the unlocking finger 2-11 corresponds to the locking pin position, the unlocking finger 2-11 pushes the locking pin 2-1 out of the lock hole 41 to complete the unlocking action. The dial wheel 2-1 is provided with a gear drive part 2-12. The gear drive part 2-12 is an arc-shaped actuating groove extending along the rotation direction of the dial wheel 2-1. The drive gear 4 is provided with a mating part 43 that is linked and cooperates with the gear drive part 2-12. The mating part 43 is a protrusion protruding on the drive gear 4. The protrusion is inserted into the arc-shaped actuating groove and can slide relative to it. The two end walls of the arc-shaped actuating groove are actuating walls that cooperate with the push of the protrusion. The stroke of the protrusion sliding relative to the arc-shaped actuating groove is adapted to the stroke of the lock drive shaft 2 operating the elastic self-locking component to complete the unlocking. Of course, as an equivalent technical solution, the gear drive unit can also be a protruding post on the actuating wheel, and correspondingly, the mating part is an arc-shaped actuating groove extending along the rotation direction of the drive gear. When the actuating wheel performs the unlocking action of the elastic self-locking component, the protruding post and the arc-shaped actuating groove move relative to each other. After the elastic self-locking component is unlocked, one end wall of the protruding post and the arc-shaped actuating groove abuts against each other. As the actuating wheel rotates, the actuating wheel 2-1 pushes the drive gear 4 to rotate, that is, the lock drive shaft 2 drives the drive gear 4 to rotate via the actuating wheel 2-1, performing the unlocking action of the pre-tensioning locking mechanism; the elastic self-locking component has a reasonable and compact structural design and is simple and convenient to assemble.

[0041] Guided by the essential spirit of this utility model, the elastic self-locking component of this utility model may also have other features not described in this specific embodiment. Figures 9-13The embodiments shown are subject to modification by those skilled in the art, who can also make corresponding modifications based on existing technology and under the guidance of this utility model. For example, in addition to the drive gear position shown in the figures, the working position of the elastic self-locking component can also be the lock drive shaft (specifically, a steel ball spring pin is provided on the lock drive shaft, and a concave hole is provided on the lock box), or the position of gear 31 (specifically, a steel ball spring pin is provided on the lock box, and a concave hole is provided on gear 31), etc.; the cooperation of the steel ball spring pin and the concave hole can also be used, and the disengagement of the steel ball spring pin and the concave hole unlocks the device. For example, the elastic self-locking component can also adopt a ratchet and pawl structure. Specifically, the drive gear has a shaft with a locking groove, and a pawl is hinged to the lock box. The pawl works with a torsion spring, compression spring, or spring plate. The pawl head engages in the locking groove to achieve automatic locking. The lock drive shaft is connected to an unlocking structure for moving the pawl to unlock. Alternatively, the elastic self-locking component can use a spring plate with a locking protrusion. The spring plate is installed on the lock box, and a locking recess is designed on the drive gear. The protrusion of the spring plate engages in the locking recess to achieve locking, etc.

[0042] like Figure 4 and Figure 5 As shown, the above-mentioned compression-tension locking device can be applied to a crank lock. The lock box 1 of the above-mentioned compression-tension locking device is fixed on the lock shell 8 of the crank lock. The lock drive shaft 2 and the rotating shaft 91 for mounting the handle 9 are coaxially connected. In this way, the lock transmission assembly and the pre-tension locking mechanism can be driven simultaneously through the handle to perform locking and unlocking operations.

Claims

1. A compression-tension locking device, comprising a lock housing, a lock drive shaft, and a lock transmission assembly, wherein the lock drive shaft is rotatably fitted within the lock housing, and drives the lock transmission assembly, characterized in that: The bottom of the lock box is also equipped with a pre-tensioning locking mechanism, which includes a drive gear, a guide assembly, and a pre-tensioning locking member with a lock head. The lock head is positioned towards the top of the lock box. The lock drive shaft drives the drive gear to rotate. The pre-tensioning locking member has a rack portion, and the drive gear meshes with the rack portion for transmission. The pre-tensioning locking member is configured to move relative to the lock box along a predetermined trajectory under the guidance and restriction of the guide assembly. This predetermined trajectory has two movement directions: a tightening direction along the axial direction of the drive gear and a forward / backward direction along the extension direction of the rack portion. During the switching between the unlocked and locked positions of the lock head, the pre-tensioning locking member moves synchronously in both movement directions. The pre-tensioning locking mechanism is equipped with an elastic self-locking component. When the pre-tensioning locking mechanism enters the locked state, the elastic self-locking component locks the pre-tensioning locking mechanism, and the lock drive shaft operates the elastic self-locking component to complete the unlocking.

2. The compression-tension locking device according to claim 1, characterized in that: After the lock drive shaft operates the elastic self-locking component to complete the unlocking stroke, it drives the pre-tensioning locking mechanism to unlock.

3. The compression-tension locking device according to claim 2, characterized in that: The elastic self-locking assembly includes a locking pin, which is movably mounted on the lock housing along the axial direction of the drive gear. A locking hole is axially formed on the drive gear body. The locking pin has a head that can engage with the locking hole. A self-locking spring is connected to the tail of the locking pin, driving the head of the locking pin into the locking hole. A dial wheel that rotates with the lock drive shaft is mounted on the lock drive shaft. An unlocking finger protrudes from the dial wheel. An clearance groove is provided on the drive gear to avoid the unlocking finger. The locking hole corresponds to the clearance groove. The unlocking finger extends into the clearance groove and engages with the head of the locking pin. The dial wheel is provided with… The gear drive unit has a mating part on the drive gear that is linked and engaged with the gear drive unit. The gear drive unit is an arc-shaped actuation groove extending along the rotation direction of the actuation wheel or a protruding post on the actuation wheel. Correspondingly, the mating part is a protruding post on the drive gear or an arc-shaped actuation groove extending along the rotation direction of the drive gear. The protruding post is inserted into the arc-shaped actuation groove and can slide relative to it. The two end walls of the arc-shaped actuation groove are actuation walls that are engaged with the pushing of the protruding post. The stroke of the protruding post sliding relative to the arc-shaped actuation groove is adapted to the stroke of the lock drive shaft operating the elastic self-locking component to complete the unlocking.

4. The compression-tension locking device according to claim 1, characterized in that: The predetermined trajectory corresponds to a lifting and unfolding stroke of the lock head away from the locked position before the downward locking stroke of the lock head approaches the locked position in the tension direction during the process of guiding the lock head to move from the unlocked position to the locked position.

5. The compression-tension locking device according to claim 1 or 4, characterized in that: The guide assembly includes a guide rocker arm and a guide groove. The guide groove is arc-shaped. One end of the guide rocker arm is pivotally mounted on the lock box, and the other end of the guide rocker arm is hinged to the pre-tightening locking member. The pre-tightening locking member is provided with a guide pin, which guides and fits in the guide groove.

6. The compression-tension locking device according to claim 1 or 4, characterized in that: The pre-tightening locking component includes a U-shaped main frame, a lock head installed at one end of the U-shaped main frame, a rack portion provided on at least one horizontal wall panel of the U-shaped main frame, a protrusion inserted into the U-shaped main frame on the lock box, a drive gear located on the bottom of the protrusion, and guide components arranged on both horizontal sides of the U-shaped main frame.

7. The compression-tension locking device according to claim 6, characterized in that: The bottom plate of the U-shaped main frame is folded back to form a lock head mounting plate. A lock head bracket is installed on the lock head mounting plate. The lock head bracket includes an L-shaped plate. The fixing plate of the L-shaped plate has a strip hole extending in the tension direction. The fixing plate of the L-shaped plate is attached to and fastened to the lock head mounting plate by fasteners in an adjustable position. The other plate of the L-shaped plate has a mounting ear. The lock head is a roller mounted on the mounting ear via a wheel axle.

8. The compression-tension locking device according to claim 6, characterized in that: The guiding assembly includes a first lifting rocker arm and a second lifting rocker arm. One end of the first and second lifting rocker arms is hinged to the lock box, and the other end of the first and second lifting rocker arms is hinged to the outer side of the two side frame plates of the U-shaped main frame. The protrusion of the lock box is provided with two opposing positioning planes, and the inner sidewalls of the two side frame plates of the U-shaped main frame are positioned and engaged with the positioning planes.

9. The compression-tension locking device according to claim 8, characterized in that: The U-shaped main frame extends to a U-shaped lock head mounting part, and the lock head is positioned and slidably fitted in the frame groove of the U-shaped lock head mounting part. An adjusting screw is positioned and rotatably fitted on the bottom plate of the U-shaped lock head mounting part, and the adjusting screw is screwed into the lock head thread.

10. A crank lock, comprising a lock housing, a handle mounted on the lock housing via a pivot, and a locking device disposed at the bottom of the lock housing, the locking device comprising a lock box, a lock drive shaft, and a lock transmission assembly, wherein the pivot and the lock drive shaft are coaxial and linked, the lock drive shaft is rotatably fitted within the lock box, and the lock drive shaft drives the lock transmission assembly, characterized in that: The locking device is the compression-tension locking device described in any one of claims 1 to 9.

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