A connecting rod lock

Abstract

This utility model relates to the field of high-sealing door lock technology, and particularly to a linkage lock, including a lock shell, a handle shaft, and a handle connected to the handle shaft. The lock shell is provided with a transmission box, which contains a gear connected to the handle shaft, an inner guide sleeve connected to the handle shaft, an outer guide sleeve sleeved outside the inner guide sleeve, a transmission shaft inserted into the inner guide sleeve, and a first connecting rod and a second connecting rod disposed on both sides of the gear and meshing with it. A pin is inserted through one end of the transmission shaft placed in the inner guide sleeve, and a lock tongue is connected to the other end of the transmission shaft placed outside the gear shaft. The inner guide sleeve is provided with two waist-shaped grooves that are adapted to both ends of the pin. The center of the waist-shaped groove facing the gear is parallel to the axis of the inner guide sleeve, and the center of the other end forms a 30° angle with the axis of the inner guide sleeve in space. The outer guide sleeve is provided with two L-shaped guide grooves that are adapted to both ends of the pin. The beneficial effect of this utility model is that it ensures that the function of the linkage lock remains unchanged while reducing the number of parts.

Description

Technical Field

[0001] This utility model relates to the field of high-sealing door lock technology, specifically to a linkage lock. Background Technology

[0002] High-sealing doors are mainly used in vans, containers, freight railways, and other fields. They are transported by attached or integrated enclosed independent structures in the carriages, thus significantly improving transportation conditions, hygiene conditions, and the safety and integrity of goods. These high-sealing doors are generally locked by linkages, hence they are also called linkage locks.

[0003] The utility model document with patent publication number CN221627958U discloses a high-sealing door lock, including a driven gear connected to the handle shaft. The driven gear meshes with a main gear on one side and simultaneously meshes with toothed holes at connecting rods symmetrically arranged on both sides. A tightening bolt is set on the main drive shaft of the main gear. The handle shaft of the main gear is connected to one end of the door lock handle in the handle groove at the top of the base body. The main drive shaft is integrated with the main gear through the main gear shaft. The main drive shaft is fitted into the shaft hole at the top of the main gear shaft and abuts against a spring in the shaft hole at the top of the main gear shaft. A main shaft sleeve is fitted on the outer diameter of the main gear shaft. The main shaft sleeve and the main gear shaft are set in the main column sleeve protruding at the top of the gear rack pressure plate. The main drive shaft extending out of the main column sleeve is connected to the tightening bolt. The main shaft pin at the main drive shaft inside the main gear shaft passes through the main shaft spiral holes symmetrically arranged on both sides of the main gear shaft and is inserted into the main shaft L-shaped guide holes symmetrically arranged on both sides of the main shaft sleeve.

[0004] The aforementioned high-sealing door lock uses a main gear and a driven gear meshing method to transmit the torque of the handle rotation to the driven gear, thereby realizing the up and down movement of the connecting rods on both sides of the driven gear. This torque transmission structure involves the meshing of two gears. In order to ensure the normal operation of the door lock, it is necessary to ensure the stable meshing of the main gear and the driven gear, and the stable meshing of the driven gear and the connecting rod. This results in a complex door lock structure, increases the difficulty of assembly and production, and thus increases production costs. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a linkage lock that reduces the number of parts while maintaining the function of the linkage lock.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a linkage lock, comprising a lock housing, a handle shaft rotatably disposed within the lock housing, and a handle connected to the handle shaft. The handle is rotatable relative to the lock housing. A lock cylinder restricting the rotation of the handle is provided at one end of the lock housing away from the handle shaft. The handle is disposed on one side of the lock housing, and a transmission box is provided on the other side of the lock housing. The transmission box contains a gear connected to the handle shaft, an inner guide sleeve connected to the handle shaft, an outer guide sleeve sleeved outside the inner guide sleeve, a transmission shaft inserted into the inner guide sleeve, and a first connecting rod and a second connecting rod disposed on both sides of the gear and meshing with it. The first connecting rod and the second connecting rod move closer to or further away from each other along their length direction via the gear. In the reciprocating motion, a pin is inserted through one end of the transmission shaft placed on the inner guide sleeve. The handle shaft and the outer guide sleeve are respectively located on both sides of the gear. A locking tongue is connected to the end of the transmission shaft placed outside the gear shaft. The outer guide sleeve is fixedly installed inside the transmission box. The inner guide sleeve has two waist-shaped grooves that are adapted to both ends of the pin shaft. The center of the waist-shaped groove facing the gear is parallel to the axis of the inner guide sleeve, and the center of the other end forms a 30° angle with the axis of the inner guide sleeve in space. The outer guide sleeve has two L-shaped guide grooves that are adapted to both ends of the pin shaft. The L-shaped guide groove includes a straight groove arranged along the axis of the outer guide sleeve and a transverse groove arranged along the outer circumference of the outer guide sleeve. The transverse groove is located at the end of the outer guide sleeve near the locking tongue.

[0007] The present invention, possessing the above-mentioned features, reduces the number of parts and simplifies the force transmission structure of the handle by reducing the number of gears. Only one gear is needed to realize the up-and-down movement of the connecting rod and the rotation of the locking tongue. That is, the function of the connecting rod lock is maintained while reducing the number of parts, thereby reducing production costs and improving assembly efficiency. The angle setting of the two waist-shaped grooves allows the handle to rotate 120 degrees, and the handle drives the gear to rotate 120 degrees, avoiding the problem of reduced connecting rod stroke due to the reduction of one gear, and ensuring that the connecting rod stroke remains unchanged. Since the outer guide sleeve is fixed, when the handle is rotated counterclockwise by 30 degrees, the transmission shaft moves away from the gear. When the handle continues to rotate, the transmission shaft rotates 90 degrees, and the locking tongue rotates 90 degrees to unlock.

[0008] A further feature of this invention is that the transmission box includes a lower box seat and an upper box cover that are separately configured. The upper box cover has a shaft tube coaxially configured with the outer guide sleeve on the end face facing the locking tongue. The port of the shaft tube has a stepped surface that can abut against the port of the outer guide sleeve. The inner wall of the shaft tube has at least one limiting protrusion. The outer guide sleeve has a limiting groove that is inserted into the limiting protrusion.

[0009] The present invention, which has the above-mentioned features, restricts the circumferential rotation of the outer guide sleeve by setting a limiting protrusion inside the shaft tube of the upper cover.

[0010] A further feature of this invention is that the lower housing has a shaft hole for mounting the handle shaft. One end face of the lower housing abuts against the lock housing, and the other end face has a first mounting groove for accommodating the gear and two first long grooves distributed along its length. The first long grooves are spaced apart. The end face of the upper housing facing the lower housing has a second mounting groove for accommodating the gear and two second long grooves distributed along its length. The first mounting groove and the second mounting groove cooperate to form a chamber for the gear to rotate, and the first long groove and the second long groove cooperate to form a channel for the connecting rod to slide within it.

[0011] The present invention, which has the above features, has the following characteristics: the transmission box is set in two parts to facilitate the assembly of parts; the connecting rod is guided by the first long groove and the second long groove in the upper box cover and the lower box seat respectively to ensure that it moves in a straight line; a chamber for installing gears is set in the transmission box to ensure that the gears work normally and to avoid the influence of dust and other impurities on the meshing of the gears and connecting rods.

[0012] A further feature of this invention is that the gear has a first rectangular groove, the cross-section of the end of the handle shaft is rectangular and is inserted into the first rectangular groove, and the end of the inner guide sleeve facing the gear has a second rectangular groove that is inserted into the handle shaft.

[0013] The present invention having the above features: the handle shaft is respectively inserted into the gear and the inner guide sleeve to realize the linkage between the handle and the gear and the linkage between the handle and the inner guide sleeve. When the handle is turned, the connecting rod and the locking tongue can be activated.

[0014] A further feature of this invention is that the first connecting rod and the second connecting rod have a plurality of spaced tooth grooves evenly distributed at their ends near the gear, and the gear meshes with the tooth grooves.

[0015] The present invention, which has the above-mentioned features, achieves the meshing relationship between the gear and the connecting rod by setting tooth grooves on the connecting rod, and also achieves the reciprocating motion of the first connecting rod and the second connecting rod moving closer or further away from each other along their length direction when the gear rotates.

[0016] A further feature of this invention is that: the end face of the lock housing facing the transmission box is provided with a mounting tube coaxial with the handle shaft; at least one limiting hole is symmetrically provided on the wall of the mounting tube; a screw threadedly connected to the limiting hole is installed in the limiting hole; an annular groove is formed in the part of the handle shaft placed inside the mounting tube; and the end of the screw is placed in the annular groove.

[0017] The present invention having the above features is characterized in that the handle shaft is limited by a screw inside the lock housing, and the end of the screw is placed in an annular groove to restrict the axial movement of the handle shaft without affecting the circumferential rotation of the handle shaft.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the back of an embodiment of the present invention.

[0020] Figure 2 This is a front structural diagram of an embodiment of the present utility model.

[0021] Figure 3 This is an exploded view of an embodiment of the present invention after removing the lock shell, lock cylinder, and handle.

[0022] Figure 4 This is a schematic diagram of the internal structure of the transmission box in an embodiment of this utility model.

[0023] Figure 5 This is an exploded view of the transmission box according to an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of the box cover in an embodiment of the present utility model.

[0025] Figure 7 This is an exploded view of the lock housing and handle shaft of an embodiment of this utility model.

[0026] Figure 8 This is an exploded view of the inner guide sleeve, gear, and handle shaft in an embodiment of this utility model.

[0027] Figure 9 This is a schematic diagram of the inner guide sleeve in an embodiment of the present invention.

[0028] Figure 10 This is a schematic diagram of the structure of the outer guide sleeve in an embodiment of this utility model. Detailed Implementation

[0029] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0030] like Figure 1-10The linkage lock shown includes a lock housing 3, a handle shaft 2 rotatably disposed within the lock housing 3, and a handle 1 connected to the handle shaft 2. The handle 1 can rotate relative to the lock housing 3. A lock cylinder (not shown in the figure) restricting the rotation of the handle 1 is provided at one end of the lock housing 3 away from the handle shaft 2. The handle 1 is disposed on one side of the lock housing 3, and a transmission box 5 is provided on the other side of the lock housing 3. The transmission box 5 contains a gear 6 connected to the handle shaft 2, an inner guide sleeve 7 connected to the handle shaft 2, an outer guide sleeve 8 sleeved outside the inner guide sleeve 7, and a transmission shaft 9 inserted into the inner guide sleeve 7. A first connecting rod 10 and a second connecting rod 11 are disposed on both sides of the gear 6 and mesh with it. The first connecting rod 10 and the second connecting rod 11 reciprocate along the length direction of the gear 6, moving closer or further away from each other. The gear 6 is provided with a first rectangular groove 61. The cross-section of the end of the handle shaft 2 is rectangular and is inserted into the first rectangular groove 61. The inner guide sleeve 7 faces the gear 6. One end of the wheel 6 is provided with a second rectangular groove 72 for insertion into the handle shaft 2. The transmission shaft 9 is placed at one end of the inner guide sleeve 7 and a pin 13 is inserted through it. The handle shaft 2 and the outer guide sleeve 8 are respectively located at both ends of the gear 6. The end of the transmission shaft 9 located outside the shaft of the gear 6 is connected to a locking tongue 14. The outer guide sleeve 8 is fixedly installed in the transmission box 5. The inner guide sleeve 7 is provided with two waist-shaped grooves 71 that are adapted to both ends of the pin 13. The center of the waist-shaped groove 71 facing the gear 6 is parallel to the axis of the inner guide sleeve 7, and the center of the other end forms a 30° angle with the axis of the inner guide sleeve 7 in space. The waist-shaped groove is spirally arranged on the inner guide sleeve. The outer guide sleeve 8 is provided with two L-shaped guide grooves 81 that are adapted to both ends of the pin 13. The L-shaped guide groove 81 includes a straight groove 811 arranged along the axis of the outer guide sleeve 8 and a transverse groove 812 arranged along the outer circumference of the outer guide sleeve 8. The transverse groove 812 is located at the end of the outer guide sleeve 8 near the locking tongue 14.

[0031] The transmission box 5 includes a lower box seat 51 and an upper box cover 52, which are separately arranged. The lower box seat 51 and the upper box cover 52 are connected by screws. The upper box cover 52 has a shaft tube 53 coaxially arranged with the outer guide sleeve 8 on the end face facing the locking tongue 14. The port of the shaft tube 53 has a stepped surface 54 that can abut against the port of the outer guide sleeve 8. The inner wall of the shaft tube 53 has at least one limiting protrusion 55. The outer guide sleeve 8 has a limiting groove 82 that is inserted into the limiting protrusion 55.

[0032] The lower box base 51 has a shaft hole 513 for mounting the handle shaft 2. One end face of the lower box base 51 abuts against the lock shell 3, and the other end face has a first mounting groove 511 for accommodating the gear 6 and two first long grooves 512 distributed along its length. The first long grooves 512 are spaced apart. The end face of the upper box cover 52 facing the lower box base 51 has a second mounting groove 521 for accommodating the gear 6 and two second long grooves 522 distributed along its length. The first mounting groove 511 and the second mounting groove 521 cooperate to form a chamber for the gear 6 to rotate, and the first long groove 512 and the second long groove 522 cooperate to form a channel for the connecting rod to slide inside.

[0033] The first connecting rod 10 and the second connecting rod 11 have a number of spaced tooth grooves 101 evenly distributed at one end near the gear 6, and the gear 6 meshes with the tooth grooves 101.

[0034] The lock housing 3 has a mounting tube 31 coaxial with the handle shaft 2 on one end face facing the transmission box 5. At least one limiting hole 311 is symmetrically provided on the tube wall of the mounting tube 31. A screw 15 threadedly connected to the limiting hole 311 is installed in the limiting hole 311. The part of the handle shaft 2 placed in the mounting tube 31 has an annular groove 21, and the end of the screw 15 is placed in the annular groove 21.

[0035] To facilitate the description of the positional relationships and relative movements between the components in this embodiment, the X-axis is defined as the first direction, the Y-axis as the second direction, and the Z-axis as the third direction. The transmission shaft is positioned along the Z-axis, and the first and second connecting rods are positioned along the Y-axis. During unlocking, the key is first used to unlock the lock cylinder. After the handle disengages from the lock cylinder's limit, it is rotated. The handle drives the handle shaft to rotate. During the 30-degree rotation of the handle shaft, the handle shaft drives the gear to rotate. The first and second connecting rods, which mesh with the gear, move relative to each other along the second direction. As the door opens, the pin moves along the straight groove of the L-shaped guide groove in cooperation with the waist-shaped groove and the L-shaped guide groove. The drive shaft moves along the third direction, the latch leaves the cabinet door, and the handle shaft continues to rotate 90 degrees until it reaches 120 degrees. During this process, the gears continue to rotate, causing the first and second connecting rods to reach their maximum stroke. The pin moves along the horizontal groove of the L-shaped guide groove in cooperation with the waist-shaped groove and the L-shaped guide groove. The latch rotates 90 degrees to unlock the cabinet door. Conversely, the handle rotates counterclockwise to return the latch to its original position and lock the cabinet door. After the handle returns to its original position, the lock cylinder is locked.

Claims

1. A linkage lock, comprising a lock housing, a handle shaft rotatably disposed within the lock housing, and a handle connected to the handle shaft, wherein the handle is rotatable relative to the lock housing, and a lock cylinder is provided at one end of the lock housing away from the handle shaft to restrict the rotation of the handle, characterized in that: The handle is located on one side of the lock housing, and a transmission box is located on the other side of the lock housing. The transmission box contains a gear connected to the handle shaft, an inner guide sleeve connected to the handle shaft, an outer guide sleeve fitted over the inner guide sleeve, a transmission shaft inserted into the inner guide sleeve, and a first connecting rod and a second connecting rod located on both sides of the gear and meshing with it. The first connecting rod and the second connecting rod reciprocate along their length direction via the gear, moving closer or further apart. A pin passes through one end of the transmission shaft, which is located on the inner guide sleeve. The handle shaft and the outer guide sleeve are located at opposite ends of the gear. A locking tongue is connected to one end of the gear shaft. The outer guide sleeve is fixedly installed inside the transmission box. The inner guide sleeve has two waist-shaped grooves that are adapted to both ends of the pin shaft. The center of the waist-shaped groove facing the gear is parallel to the axis of the inner guide sleeve, and the center of the other end forms a 30° angle with the axis of the inner guide sleeve in space. The outer guide sleeve has two L-shaped guide grooves that are adapted to both ends of the pin shaft. The L-shaped guide groove includes a straight groove arranged along the axis of the outer guide sleeve and a transverse groove arranged along the outer circumference of the outer guide sleeve. The transverse groove is located at the end of the outer guide sleeve near the locking tongue.

2. A linkage lock according to claim 1, characterized in that: The transmission box includes a lower box seat and an upper box cover that are separately arranged. The upper box cover has a shaft tube that is coaxially arranged with the outer guide sleeve on the end face facing the locking tongue. The port of the shaft tube has a stepped surface that can abut against the port of the outer guide sleeve. The inner wall of the shaft tube has at least one limiting protrusion. The outer guide sleeve has a limiting groove that is inserted into the limiting protrusion.

3. A linkage lock according to claim 2, characterized in that: The lower housing has a shaft hole for mounting the handle shaft. One end face of the lower housing abuts against the lock housing, and the other end face has a first mounting groove for accommodating the gear and two first long grooves distributed along its length. The first long grooves are spaced apart. The end face of the upper housing facing the lower housing has a second mounting groove for accommodating the gear and two second long grooves distributed along its length. The first mounting groove and the second mounting groove cooperate to form a chamber for the gear to rotate, and the first long groove and the second long groove cooperate to form a channel for the connecting rod to slide inside.

4. A linkage lock according to claim 1, characterized in that: The gear is provided with a first rectangular groove, the cross-section of the end of the handle shaft is rectangular and is inserted into the first rectangular groove, and the end of the inner guide sleeve facing the gear is provided with a second rectangular groove that is inserted into the handle shaft.

5. A linkage lock according to claim 1, characterized in that: The first connecting rod and the second connecting rod have a number of spaced tooth grooves evenly distributed at the end near the gear, and the gear meshes with the tooth grooves.

6. A linkage lock according to claim 1, characterized in that: The lock housing has a mounting tube coaxial with the handle shaft on one end face facing the transmission box. At least one limiting hole is symmetrically provided on the wall of the mounting tube. A screw threadedly connected to the limiting hole is installed in the limiting hole. An annular groove is opened on the part of the handle shaft placed inside the mounting tube, and the end of the screw is placed in the annular groove.

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