A transmission lock box

Abstract

The utility model discloses a transmission lock box, aims at satisfying modern door and window convenient operation needs etc. The lock box contains the assembly plate, and it is equipped with first, second slide groove along the length direction, and linear drive mechanism is equipped in one side of assembly plate, and has first, second rack and two-stage gear, and the first tooth of two-stage gear is less than the second tooth in diameter, is engaged with two racks respectively, and the drive tooth edge of first rack, the drive sleeve of second rack is respectively slid in the corresponding slide groove, and rotary drive mechanism is in the other side of assembly plate, contains the drive pivot of connecting handle and the coaxial rotation of drive tooth, and drive tooth is engaged with drive tooth edge. This design changes traditional single rack transmission mode, and when rotating the handle of same angle, because two-stage gear transmission and double rack drive, drive sleeve stroke is long, and operation is more convenient, can also increase output moment, improve response speed, optimize the transmission path of force, solve the problem such as traditional lock box inconvenient operation, small moment, slow response, low transmission efficiency etc.

Description

Technical Field

[0001] This utility model relates to the field of door and window related technology, and in particular to a transmission lock box. Background Technology

[0002] In the field of doors and windows, especially in the area of ​​transmission lock boxes involving door and window unlocking functions, existing technologies have limitations. A common type of door and window transmission lock box works by rotating a handle to rotate the connected teeth, which in turn drives the longitudinal rack to move, ultimately achieving the locking or unlocking operation between the locking block on the window sidewall and the lock groove in the window frame.

[0003] However, these traditional lock boxes have significant drawbacks. In their transmission structure, the tooth pitch is typically in a 1:1 ratio, meaning the circumferential displacement of the handle is directly equivalent to the displacement of the locking block. This design necessitates rotating the handle at a large angle to lock or unlock, making operation inconvenient and inefficient. Furthermore, due to the single rack and pinion drive, the locking block's travel is limited, resulting in low torque and slow response. During transmission, frictional resistance between gears also leads to energy loss, further reducing transmission efficiency. This not only increases the effort required for operation but also degrades the overall performance and reliability of the lock box. Utility Model Content

[0004] The purpose of this utility model is to disclose a transmission lock box that meets the needs of modern doors and windows for convenient operation, efficient transmission, and a good user experience.

[0005] To achieve the above objectives, this utility model discloses a transmission lock box, comprising: an assembly plate having a first slide groove and a second slide groove along its length; a linear drive mechanism disposed on one side of the assembly plate, comprising a first rack, a second rack, and a secondary gear, wherein the first rack and the second rack are both parallel to the assembly plate, and the secondary gear comprises a first tooth and a second tooth, wherein the diameter of the first tooth is smaller than the diameter of the second tooth, the first tooth meshes with the first rack, and the second tooth meshes with the second rack, wherein the first rack has a drive tooth edge slidingly disposed in the first slide groove, and the second rack has a drive sleeve slidingly disposed in the second slide groove; and a rotary drive mechanism disposed on the other side of the assembly plate, comprising a drive shaft for connecting a handle and drive teeth coaxially rotating with the drive shaft, wherein the drive teeth mesh with the drive tooth edge.

[0006] By adopting the above solution, the traditional single rack and pinion transmission mode is changed. When rotating the handle at the same angle, the travel of the drive sleeve is longer due to the transmission action of the secondary gear and the simultaneous drive of the two racks. This eliminates the need for a large handle rotation angle to achieve locking or unlocking operations, unlike traditional lock boxes, thus solving the problem of inconvenience. During transmission, the speed-changing effect of the secondary gear increases the output torque. Simultaneously, the simultaneous drive of both racks improves the response speed of the entire transmission system, solving the problems of low torque and slow response. Furthermore, the simultaneous drive of the two racks further optimizes the force transmission path, significantly reducing the force required to rotate the handle and solving the problem of low transmission efficiency.

[0007] Furthermore, a rectangular hole is provided in the center of the drive shaft, the drive teeth are configured to extend at least 120 degrees circumferentially along the drive shaft, and the number of teeth of the drive teeth is 3-6.

[0008] By adopting the above scheme, the central rectangular hole provides a stable interface for the connection between the handle and the drive shaft. The drive teeth extend circumferentially by at least 120 degrees, ensuring a long contact arc between the drive teeth and the drive teeth of the first rack during drive shaft rotation. This ensures continuous and stable meshing between the drive teeth and the rack within a wide range of handle rotation angles, effectively preventing tooth disengagement and guaranteeing the continuity and stability of the transmission. The design of 3-6 drive teeth generates a large driving torque when the handle is rotated. The magnitude of the torque is related to the point of force application and the lever arm; the distribution of multiple drive teeth increases the number of points of force application, and the longer circumferential extension effectively increases the lever arm. Under the same handle rotation force, a larger torque can be output, making the drive rack move more easily and reducing the effort required for locking and unlocking doors and windows.

[0009] Furthermore, the drive shaft and the drive gear are integrally formed.

[0010] By adopting the above solution, the connection gaps and weak points between the drive shaft and the drive gear are eliminated. The one-piece molding structure makes the whole component a continuous whole, avoiding the problem of breakage or deformation caused by insufficient strength of the connection parts. This greatly improves the reliability and service life of the transmission lock box, and can also reduce the scrap rate caused by poor connection, further reducing manufacturing costs.

[0011] Furthermore, the rotary drive mechanism also includes a transmission box, which includes a base plate and a bottom plate and a cover plate mounted on both sides of the base plate. A shaft hole is provided through the bottom plate, the base plate and the cover plate, and the drive shaft is rotatably mounted in the shaft hole. A drive tooth clearance hole is provided on the side of the base plate facing the mounting plate.

[0012] By adopting the above scheme, the transmission box assembles the base plate, bottom plate, and cover plate together to form a relatively independent module. This makes the entire drive system structure more compact, reduces the number of scattered parts, and facilitates installation and management. The transmission box, composed of the bottom plate, base plate, and cover plate, provides a closed or semi-closed protective space for transmission components such as the drive shaft and drive gears, improving their operational reliability. The drive gear clearance hole solves the problem of potential interference between the drive gears and surrounding components during rotation.

[0013] Furthermore, there are two second slide grooves, located at both ends of the first slide groove, and two secondary gears, respectively located between the first slide groove and the two second slide grooves. The first rack and the second rack each have two meshing areas corresponding to the two secondary gears.

[0014] By adopting the above scheme, when power is transmitted from the drive source to the first rack, and then through the two secondary gears to the two second racks respectively, power loss during transmission can be reduced, allowing more power to be used to drive the movement of components such as doors and windows, thus improving overall transmission efficiency. The two secondary gears and their corresponding meshing areas distribute the force during transmission along two different paths. During the movement of the doors and windows, the meshing area of ​​each secondary gear and rack only bears a portion of the force. Compared to single-gear transmission, the force borne by a single gear and rack is reduced, thereby reducing vibration and impact caused by excessive force. This makes the movement of the doors and windows smoother and quieter, and the two second sliding grooves also provide a stable path for the sliding of the second racks.

[0015] Furthermore, a drive sleeve is provided at both ends of the second rack, and the two drive sleeves are respectively slidably disposed in the two second slide grooves.

[0016] By adopting the above scheme, both drive sleeves bear the force simultaneously, which improves the load-bearing capacity of the second rack, enabling it to withstand greater external forces, while avoiding rack misalignment or tilting caused by unilateral force. This balanced force state helps maintain a stable meshing relationship between the rack and the secondary gear, reducing changes in meshing clearance caused by rack misalignment, thereby ensuring the smoothness and continuity of transmission. A stable transmission relationship can effectively reduce vibration and noise generated during transmission.

[0017] Furthermore, the assembly plate is provided with limit posts, which are located at both ends of the linear drive mechanism to limit the maximum range of displacement of the linear drive mechanism.

[0018] By adopting the above solution, excessive displacement may cause the drive mechanism to collide violently with other components, resulting in damage to the drive mechanism itself. The setting of the limit post can clearly define the displacement boundary of the linear drive mechanism. When the drive mechanism approaches the maximum displacement range, the limit post will contact it first, preventing it from moving further, thereby avoiding equipment damage caused by excessive displacement and ensuring the safe operation of the entire system.

[0019] Furthermore, the assembly plate is provided with at least two support columns, the ends of which are connected to limit plates, and a sliding space is formed between the limit plates and the assembly plate for the first rack and the second rack to move.

[0020] By adopting the above scheme, the sliding space jointly constructed by the limiting plate and the assembly plate provides precise guide tracks for the first and second racks. During the sliding process, the racks are constrained on both sides by the limiting plate and can only move along a preset straight line, effectively avoiding problems such as rack deviation, wobbling, or tilting during movement. It also avoids local stress concentration, reduces structural deformation and damage caused by long-term stress, and improves the strength and durability of the entire structure.

[0021] Furthermore, a fastening plate is provided at the end of the assembly plate away from the rotary drive mechanism. The fastening plate has a first groove for accommodating the linear drive mechanism. The fastening plate and the assembly plate are connected by a fastener.

[0022] By adopting the above scheme, the first groove of the fastening plate can tightly accommodate the linear drive mechanism, providing it with a stable support platform. When the linear drive mechanism is running, it generates certain vibrations and forces. Through its connection with the assembly plate, the fastening plate can distribute these forces throughout the entire assembly structure, reducing the shaking and displacement caused by the linear drive mechanism's own operation, thereby improving the stability of the entire transmission system. The first groove of the fastening plate can provide a clear installation position for the linear drive mechanism, enabling installers to quickly and accurately place the linear drive mechanism in the correct position.

[0023] Furthermore, the fastening plate is wrapped with an outer shell, the outer shell having a second groove for accommodating the assembly plate and the fastening plate, the fastening plate having a snap-fit ​​opening, and the inner side of the outer shell having a snap-fit ​​block corresponding to the snap-fit ​​opening.

[0024] By adopting the above solution, the second groove of the outer casing completely accommodates the assembly plate and fastening plate, providing a solid physical barrier for the internal components. The outer casing can preferentially withstand external impacts, preventing direct damage to precision parts on the assembly plate, fastening plates, and linear drive mechanisms, effectively extending the service life of the equipment. The outer casing hides the cluttered internal assembly plates and fastening plates, making the equipment's appearance cleaner and more aesthetically pleasing. It also effectively blocks most dust and moisture from entering the interior and damaging internal components, ensuring the normal operation of the equipment.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By adopting a two-stage gear transmission and a double rack drive mode, the drive sleeve travel is longer when the handle is rotated at the same angle. Unlike traditional lock boxes, the handle does not need to be rotated as much, which greatly improves the convenience of operation and allows users to complete the locking and unlocking of doors and windows more easily and quickly. With the two racks being driven at the same time, the action of the rotary drive mechanism can be transmitted to the locking block more quickly, which greatly improves the response speed of the entire transmission system, so that the user's operation can be fed back in time, and the smoothness of use is improved. 2. The speed change via the two-stage gear increases the torque output to the second rack. This increased torque means more power is provided when driving the locking block, ensuring more reliable and stable locking and unlocking actions. Even when encountering resistance, the operation can be completed smoothly. By simultaneously driving two racks, the force transmission path is optimized, reducing energy loss during transmission and allowing more energy to be effectively transferred to the drive sleeve. This significantly reduces the force required to turn the handle, improves transmission efficiency, and reduces the user's operational intensity. 3. Due to the improved transmission efficiency and increased output torque, users no longer need to forcefully turn the handle when operating the door and window unlocking function, unlike with traditional lock boxes. A gentle turn of the handle is sufficient to lock or unlock. This easy and effortless operation significantly improves user comfort and satisfaction, especially for users with less strength or those who frequently need to operate doors and windows. 4. The overall structure is compact and makes full use of the space of the assembly plate, making the entire transmission lock box smaller in size, which is convenient for installation in limited spaces such as doors and windows, and will not have too much impact on the overall structure of the doors and windows. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model; Figure 2 This is a partial exploded structural diagram of an embodiment of the present invention; Figure 3 This is a schematic diagram of the assembly structure of the linear drive mechanism according to an embodiment of the present utility model; Figure 4 This is an exploded structural diagram of the linear drive mechanism according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal side drive structure of an embodiment of the present utility model.

[0028] Explanation of key figure labels: 100. Assembly plate; 110. First slide groove; 120. Second slide groove; 130. Limiting post; 140. Support post; 150. Limiting plate; 160. Sliding space; 170. Fastening plate; 171. First groove; 172. Bayonet; 180. Outer shell; 181. Second groove; 182. Snap-fit ​​block; 200. Linear drive mechanism; 210. First rack; 211. Drive tooth edge; 220. Second rack; 221. Drive sleeve; 230. Secondary gear; 231. First tooth; 232. Second tooth; 240. Meshing area; 300. Rotary drive mechanism; 310. Drive shaft; 311. Rectangular hole; 320. Drive tooth; 330. Transmission box; 331. Base plate; 332. Bottom plate; 333. Cover plate; 334. Shaft hole; 335. Drive tooth clearance hole. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0031] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0032] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0033] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0034] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0035] See embodiments of this utility model. Figures 1 to 5 As shown, a transmission lock box is provided, including an assembly plate 100, a linear drive mechanism 200, and a rotary drive mechanism 300. The assembly plate 100 serves as the basic support structure. The linear drive mechanism 200 and the rotary drive mechanism 300 are respectively disposed on both sides of the assembly plate 100. The rotary motion is converted into linear motion through gear and rack transmission, thereby driving the movement of the door and window locking block to complete the locking or unlocking operation.

[0036] Specifically, the assembly plate 100 is a rectangular plate structure, formed by stamping metal sheets, possessing sufficient strength and rigidity. Along its length (i.e., Figure 1 In the vertical direction of the mounting plate 100, a first groove 110 and a second groove 120 are provided. In this embodiment 1, the first groove 110 is a long, narrow through groove or a waist-shaped groove, located in the central area of ​​the mounting plate 100 and extending along its length. There are two second grooves 120, located at the two ends of the first groove 110, namely the upper end and the lower end. Each second groove 120 is also a long, narrow through groove or a waist-shaped groove, parallel to the first groove 110. In some embodiments, the first groove 110 and the second groove 120 can be collinear, but this is not limited in this embodiment 1.

[0037] It should be noted that the following auxiliary structures can also be optionally assembled on the assembly plate 100: the auxiliary structures include, but are not limited to, the limiting post 130, the support post 140, the limiting plate 150, the fastening plate 170 and the outer shell 180.

[0038] In this embodiment 1, all the above auxiliary structures are present. Specifically, two sets of limiting posts 130 are provided, located at both ends of the expected displacement path of the linear drive mechanism 200, that is, near the upper and lower edges of the assembly plate 100. The limiting posts 130 are cylindrical protrusions formed by stamping, used to limit the maximum displacement range of the linear drive mechanism 200 and prevent excessive displacement from causing collisions or damage.

[0039] At least two support columns 140 are provided; in this embodiment 1, two are provided. They are located on the assembly plates 100 at both ends of the first slide groove 110 and are spaced apart from other structures to avoid interference. The support columns 140 are columnar protrusions, and their ends are connected to limiting plates 150. The limiting plates 150 are flat and parallel to the assembly plates 100, and are fixed to the support columns 140 by welding or riveting. A sliding space 160 is formed between the limiting plates 150 and the assembly plates 100 for the movement of the rack in the linear drive mechanism 200, and provides guidance and constraint.

[0040] The fastening plate 170 is located at the end of the assembly plate 100 away from the rotary drive mechanism 300 (i.e. Figure 2 (Left end of the middle). The fastening plate 170 is detachably connected to the mounting plate 100 by fasteners such as screws or bolts. The fastening plate 170 has a first groove 171 for accommodating part of the linear drive mechanism 200. The fastening plate 170 is also provided with a snap-fit ​​172. The outer shell 180 is wrapped around the fastening plate 170. The outer shell 180 is made of plastic or metal and has a second groove 181 for accommodating the mounting plate 100 and the fastening plate 170. The inner side of the outer shell 180 is provided with a snap-fit ​​block 182 corresponding to the snap-fit ​​172, which fixes the fastening plate 170 by snap-fit, facilitating installation and disassembly. The outer shell 180 provides protection and aesthetics for the internal components, so that the mounting plate 100 and the fastening plate 170 are completely accommodated in the second groove 181, or aligned with the groove of the second groove 181.

[0041] The linear drive mechanism 200 is located on one side of the assembly plate 100 (i.e., Figure 2 , Figure 4 The linear drive mechanism 200 includes a first rack 210, a second rack 220, and a secondary gear 230, located at the left end of the mounting plate 100, specifically within the sliding space 160 between the limiting plate 150 and the mounting plate 100. (See also...) Figure 4As shown, the first rack 210 is an elongated structure, arranged parallel to the mounting plate 100. One side of the first rack 210 protrudes outward and extends into the first groove 171, and its surface has teeth, thereby forming a driving tooth edge 211. The driving tooth edge 211 has a continuous tooth structure for meshing with the rotary drive mechanism 300. The first rack 210 slides in the first slide groove 110 via the driving tooth edge 211, that is, the driving tooth edge 211 is embedded in the first slide groove 110 and can slide along it.

[0042] The second rack 220 is an elongated structure, parallel to the first rack 210, and located on the side of the first rack 210 away from the mounting plate 100. A drive sleeve 221 is provided at both ends of the second rack 220. The drive sleeve 221 is a cylindrical sleeve that slidably fits into the second slide groove 120. The second rack 220 and the first rack 210 are linked by a secondary gear 230. Two secondary gears 230 are provided, located between the first slide groove 110 and the two second slide grooves 120 respectively, and vertically connected to the mounting plate 100 by pins. Each secondary gear 230 includes a first tooth 231 and a second tooth 232, the diameter of the first tooth 231 being smaller than the diameter of the second tooth 232. The first tooth 231 meshes with the first rack 210, and the second tooth 232 meshes with the second rack 220. Therefore, the first rack 210 and the second rack 220 are respectively provided with two meshing areas 240 corresponding to the two secondary gears 230, namely the area where the first rack 210 meshes with the two first teeth 231, and the area where the second rack 220 meshes with the two second teeth 232.

[0043] The linear drive mechanism 200 is located entirely within the sliding space 160, and its vertical position is constrained by the limiting plate 150 to ensure smooth sliding of the rack. When the first rack 210 is driven, the second rack 220 obtains a longer stroke and a greater output torque through the speed change action of the secondary gear 230.

[0044] The rotary drive mechanism 300 is mounted on the other side of the mounting plate 100 (i.e. Figure 2 , Figure 4The right end of the drive shaft 310 includes a drive shaft 310, a drive gear 320, and a transmission box 330. The drive shaft 310 is a cylindrical shaft with a rectangular hole 311 in the center for connecting a door or window handle (not shown in the figure). The handle is keyed to the drive shaft 310 through the rectangular hole 311 and can rotate synchronously. The drive gear 320 rotates coaxially with the drive shaft 310. In this embodiment 1, the drive shaft 310 and the drive gear 320 are integrally formed, and the integral structure is made by injection molding or machining, which improves strength and reliability. The drive gear 320 is configured to extend at least 120 degrees circumferentially along the drive shaft 310, and the number of teeth of the drive gear 320 is 3-6. The drive gear 320 meshes with the drive tooth edge 211 of the first rack 210. In this embodiment 1, the drive gear 320 is configured to extend 180° circumferentially along the drive shaft 310, and the number of teeth of the drive gear 320 is 3. The pitch of the drive gear 320 is large enough to provide sufficient torque.

[0045] In some embodiments, the transmission box 330 further includes a base plate 331, a bottom plate 332, and a cover plate 333. The base plate 331 has a rectangular block structure with multiple clearance slots inside. The bottom plate 332 and the cover plate 333 are respectively mounted on both sides of the base plate 331 (i.e., Figure 2 , Figure 4 The base plate 331, bottom plate 332, and cover plate 333 are fixedly connected by screws or studs passing through them (on the rear and front sides). The upper and lower ends of the cover plate are provided with bent connecting pieces, which are fixed to the mounting plate 100 by screws, thereby fixing the transmission box 330 as a whole to the mounting plate 100. A shaft hole 334 is provided through the bottom plate 332, base plate 331, and cover plate 333, and the drive shaft 310 is rotated and assembled into the shaft hole 334 via bearings, bushings, or other structures. A drive tooth clearance hole 335 is provided on the side of the base plate 331 facing the mounting plate 100 to accommodate the drive tooth 320 and prevent interference during its rotation. In some embodiments, a drive tooth clearance hole 335 may also be provided on the side of the base plate 331 facing away from the mounting plate 100.

[0046] When the user turns the handle, the drive shaft 310 rotates synchronously, causing the drive gear 320 to rotate. The drive gear 320 meshes with the drive tooth edge 211 of the first rack 210, driving the first rack 210 to move linearly along the first slide groove 110. The movement of the first rack 210 is transmitted to the second rack 220 through two secondary gears 230. Since the diameter of the first tooth 231 of the secondary gear 230 is smaller than the diameter of the second tooth 232, the moving speed of the second rack 220 is greater than that of the first rack 210, thus achieving speed-increasing transmission. The drive sleeves 221 at both ends of the second rack 220 slide along the second slide groove 120. The drive sleeves 221 are connected to the door and window locking block, either via a connecting rod or a direct connection, thereby pushing the locking block to insert or exit the lock groove of the window frame to complete the locking or unlocking operation.

[0047] Throughout the process, the limiting post 130 ensures that the displacement of the linear drive mechanism 200 does not exceed the design range, the support post 140 and the limiting plate 150 maintain the stable sliding of the rack, and the fastening plate 170 and the housing 180 provide structural protection and installation convenience.

[0048] The transmission lock box in this embodiment achieves the following beneficial effects through two-stage gear transmission and double rack drive: 1. Easy to operate: When the handle is turned to the same angle, the stroke of the drive sleeve 221 becomes longer, so locking or unlocking can be completed without turning the handle a lot, making the operation light and quick.

[0049] 2. Increased torque: The speed change function of the secondary gear 230 increases the output torque, ensuring reliable locking and smooth operation even with resistance.

[0050] 3. Rapid response: The simultaneous drive of the dual racks improves the response speed of the transmission system, providing timely feedback to user operations.

[0051] 4. High-efficiency transmission: Optimized force transmission path reduces energy loss, requires less force to turn the handle, and provides a comfortable user experience.

[0052] 5. Compact structure: The components are rationally laid out, small in size, and easy to install in the limited space of doors and windows.

[0053] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A transmission lock box, characterized in that, include: An assembly plate (100) is provided with a first groove (110) and a second groove (120) along its length. A linear drive mechanism (200) is disposed on one side of the assembly plate (100) and includes a first rack (210), a second rack (220), and a secondary gear (230). The first rack (210) and the second rack (220) are both arranged parallel to the assembly plate (100). The secondary gear (230) includes a first tooth (231) and a second tooth (232). The diameter of the first tooth (231) is smaller than the diameter of the second tooth (232). The first tooth (231) meshes with the first rack (210), and the second tooth (232) meshes with the second rack (220). The first rack (210) is provided with a drive tooth edge (211) that slides in the first slide groove (110), and the second rack (220) is provided with a drive sleeve (221) that slides in the second slide groove (120). A rotary drive mechanism (300) is mounted on the other side of the mounting plate (100) and includes a drive shaft (310) for connecting the handle and a drive tooth (320) that rotates coaxially with the drive shaft (310). The drive tooth (320) meshes with the drive tooth edge (211).

2. A transmission lock box according to claim 1, characterized in that, The drive shaft (310) has a rectangular hole (311) in the center, the drive tooth (320) is configured to extend at least 120 degrees circumferentially along the drive shaft (310), and the number of teeth of the drive tooth is 3-6.

3. A transmission lock box according to claim 1 or 2, characterized in that, The drive shaft (310) and the drive gear (320) are integrally formed.

4. A transmission lock box according to claim 1 or 2, characterized in that, The rotary drive mechanism (300) further includes a transmission box (330), which includes a base plate (331) and a bottom plate (332) and a cover plate (333) assembled on both sides of the base plate (331). A shaft hole (334) is provided through the bottom plate (332), the base plate (331) and the cover plate (333), and the drive shaft (310) is rotatably assembled in the shaft hole (334). The substrate (331) has a drive tooth clearance hole (335) on the side facing the assembly plate (100).

5. A transmission lock box according to claim 1, characterized in that, There are two second slide grooves (120), which are located at both ends of the first slide groove (110). There are two secondary gears (230), which are respectively located between the first slide groove (110) and the two second slide grooves (120). The first rack (210) and the second rack (220) are respectively provided with two meshing areas (240) corresponding to the two secondary gears (230).

6. A transmission lock box according to claim 5, characterized in that, A drive sleeve (221) is provided at both ends of the second rack (220), and the two drive sleeves (221) are respectively slidably disposed in the two second slide grooves (120).

7. A transmission lock box according to claim 1, characterized in that, The assembly plate (100) is provided with limit posts (130), which are located at both ends of the linear drive mechanism (200) and are used to limit the maximum range of displacement of the linear drive mechanism (200).

8. A transmission lock box according to claim 1, characterized in that, The assembly plate (100) is provided with at least two support columns (140), and the ends of the support columns (140) are connected to limit plates (150). A sliding space (160) is formed between the limit plates (150) and the assembly plate (100) for the first rack (210) and the second rack (220) to move.

9. A transmission lock box according to claim 1, characterized in that, The assembly plate (100) has a fastening plate (170) at one end away from the rotary drive mechanism (300). The fastening plate (170) has a first groove (171) for accommodating the linear drive mechanism (200). The fastening plate (170) is connected to the assembly plate (100) by a fastener.

10. A transmission lock box according to claim 9, characterized in that, The fastening plate (170) is wrapped with an outer shell (180). The outer shell (180) has a second groove (181) for accommodating the assembly plate (100) and the fastening plate (170). The fastening plate (170) is provided with a snap-fit ​​(172). The inner side of the outer shell (180) is provided with a snap-fit ​​block (182) corresponding to the snap-fit ​​(172).

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