Power tool backing locking mechanism

Abstract

A locking mechanism for a power tool includes a fixed locking block installed below one end of the support, a fixed bracket installed at the other end of the support, and a locking handle hinged to the fixed bracket via a second pivot. A first pivot is located outside the second pivot on the locking handle, connected to one end of a drive shaft. The other end of the drive shaft is connected to one end of a lower moving plate located inside the support. A sliding locking block is installed below the other end of the lower moving plate. When the locking handle is rotated inward to the locked position, the drive shaft pushes the sliding locking block inward, reducing the distance between the sliding locking block and the fixed locking block, thus locking the support. When the locking handle is rotated outward to the open position, the drive shaft pushes the sliding locking block outward, increasing the distance between the sliding locking block and the fixed locking block, thus releasing the support. This invention features adjustable locking force and stable locking; the locking handle can be folded inward, making it less likely to be touched, ensuring the cutting accuracy and safety of the power tool.

Description

Technical Field

[0001] This utility model relates to auxiliary components for power tools, specifically to structural and performance improvements of backrest locking components, and more particularly to a backrest locking mechanism for power tools. Background Technology

[0002] A guide rail is a component in power tools that primarily ensures the movement of wood or tools in a straight line and also serves as a guide. With the technological development and upgrades of power tools, guide rails have now become an essential accessory in virtually every power tool. Specifically, the functions of a guide rail mainly include:

[0003] 1. Ensure straight-line movement. Whether it's timber or power tools, the support ensures they move in a straight line, preventing deviation.

[0004] 2. Secure the timber; the timber can be fitted against the backing to ensure it will not move during the cutting process.

[0005] 3. Ruler function: Some power tools also have a ruler on the back, making cutting operations simpler and more convenient.

[0006] The backrest plays a crucial role in the cutting process of power tools, ensuring machining accuracy and efficiency. The backrest is typically mounted above the power tool's worktable and is locked or released via a locking mechanism to meet the needs of positional adjustment, angle adjustment, or fixed positioning.

[0007] Currently, conventional locking mechanisms, such as the downward-pressing type and the outward-folding locking type, place the locking handle on the outside of the backrest after locking. This takes up space and is also prone to accidental activation, causing the locking handle to pop open. Consequently, the backrest may shift during use, affecting the cutting accuracy and safety of the power tool.

[0008] For example, the "backrest structure with guiding function" disclosed in Chinese Patent (authorization announcement number CN 219505008 U) includes a backrest body, one end of which is connected to a front locking component, and the other end of which is connected to a rear locking component. The front locking component includes a backrest seat, and a locking block is hinged inside the backrest seat. The locking block is connected to the rear locking component through a long screw. A movable front locking steel plate is provided below the backrest seat, and the locking block is connected to the front locking steel plate. A wrench assembly for controlling the locking block is also connected to the backrest seat.

[0009] For example, the "Synchronous Backrest Locking Device for Woodworking" disclosed in Chinese Patent (Authorization Announcement No. CN 220261285 U) includes a backrest body, a first locking mechanism, a pull rod, and a second locking mechanism. The first locking mechanism can lock one end of the backrest body to the table, and one end of the pull rod is connected to the first locking mechanism, while the other end is connected to the second locking mechanism. The second locking mechanism can lock the other end of the backrest body to the table. The locking device has two working conditions. In working condition one, both the first and second locking mechanisms are locked, with the first locking block pressing against the front guide rail and the second locking block pressing against the rear guide rail, thus limiting the relative position between the backrest body and the table. In working condition two, both the first and second locking mechanisms are released, with a gap between the first locking block and the front guide rail, and a gap between the second locking block and the rear guide rail. Moving the backrest body can adjust the relative position between the backrest body and the table.

[0010] Among the aforementioned backing locking devices, "a backing structure with a guiding function" still belongs to the common outward folding locking type; "a woodworking synchronous backing locking device" adopts an inward folding locking method, but the locking structure that works with the locking handle is complex and cannot be used with common power tools such as miter saws and table saws. Utility Model Content

[0011] The purpose of this utility model is to provide a backing locking mechanism for power tools, which solves the problems of existing backing locks occupying space and being prone to accidental contact.

[0012] To achieve the purpose of this utility model, the following technical solution is adopted:

[0013] A locking mechanism for a power tool includes a fixed locking block installed below one end of the backrest. A fixed bracket is installed at the other end of the backrest. A locking handle is hinged to the fixed bracket via a second pivot. A first pivot is located outside the second pivot on the locking handle. One end of the first pivot is connected to a drive shaft, and the other end of the drive shaft is connected to one end of a lower moving plate located inside the backrest. A sliding locking block is installed below the other end of the lower moving plate. When the locking handle is rotated inward to the locked state, the drive shaft pushes the sliding locking block inward, reducing the distance between the sliding locking block and the fixed locking block and locking the backrest in place. When the locking handle is rotated outward to the open state, the drive shaft pushes the sliding locking block outward, increasing the distance between the sliding locking block and the fixed locking block and releasing the backrest.

[0014] To further achieve the objectives of this utility model, the following technical solutions may also be adopted:

[0015] As described above, the lower moving plate of the power tool includes a lower moving plate bracket and a lower moving plate intermediate body. One end of the lower moving plate bracket is connected to the drive shaft, and the other end of the lower moving plate bracket is fixed to one end of the lower moving plate intermediate body. A sliding locking block is installed at the other end of the lower moving plate intermediate body.

[0016] As described above, the locking mechanism of the power tool has a radial first through hole in the middle of the first rotating shaft, the end of the transmission shaft passes through the first through hole, and adjustable nuts are installed on the transmission shaft on both sides of the first through hole.

[0017] As described above, in the backing locking mechanism of the power tool, a third rotating shaft is mounted on the lower moving plate. A radial second through hole is opened in the middle of the third rotating shaft. The end of the transmission shaft passes through the second through hole, and fixed or adjustable nuts are installed on the transmission shaft on both sides of the second through hole.

[0018] As described above, in the locking mechanism of the power tool, when the locking handle is rotated inward to the locked state, the height of the axis of the first rotating shaft is lower than the height of the axis of the second rotating shaft, forming the self-locking angle of the locking handle.

[0019] The self-locking angle of the backing locking mechanism of the power tool described above is in the range of 1-20°.

[0020] As described above, in the backrest locking mechanism of the power tool, the lower moving plate is disposed in the groove on the bottom surface of the backrest, and one end of the fixed bracket is fastened and fixed to the outside of the groove of the backrest.

[0021] The advantages of this utility model are:

[0022] 1. The locking force of the locking handle of this utility model is adjustable when rotated inward, which is convenient to use. Specifically, one end of the drive shaft passes through the first through hole of the first rotating shaft and is connected to the other end of the drive shaft with an adjustable nut. The other end of the drive shaft is connected to the lower moving plate. The drive shaft can move axially along the first through hole. By adjusting the position of the nut installed on the drive shaft, the distance between the first rotating shaft and the lower moving plate can be adjusted, thereby adjusting the locking force.

[0023] 2. In this invention, after locking, the axis of the first rotating shaft is lower than the axis of the second rotating shaft, forming a self-locking angle. The greater the axial force, the tighter the lock, and the locking handle will not pop open.

[0024] 3. Compared to existing structures such as the downward-pressing type and the outward-folding locking type, which place the locking handle on the outside after locking, taking up space and making it easy to accidentally pop open, the locking handle of this invention folds inside the backrest when locked, saving space and making it less likely to be touched. This prevents displacement of the backrest during use, ensuring the cutting accuracy and safety of the power tool. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0026] Figure 1 This is a perspective view of the present invention;

[0027] Figure 2 yes Figure 1 Front view of the support wall in the loosened state;

[0028] Figure 3 yes Figure 1 The main view with the mountain in the middle;

[0029] Figure 4 yes Figure 1 The front view of the mountain-backed structure in the locked state;

[0030] Figure label:

[0031] 1-Backrest; 2-Fixed locking block; 3-Fixed bracket; 4-Locking handle; 5-First rotating shaft; 6-Second rotating shaft; 7-Drive shaft; 8-Nut; 9-Third rotating shaft; 10-Lower moving plate; 11-Lower moving plate bracket; 12-Lower moving plate intermediate body; 13-Sliding locking block.

[0032] a - self-locking angle. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0034] In the description of the embodiments of this utility model, unless otherwise explicitly limited, terms such as setting, installing, and connecting should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0035] like Figures 1-4 As shown in this embodiment, a locking mechanism for a power tool includes a fixing locking block 2, which is installed below one end of a support 1, and a fixing bracket 3 is installed at the other end of the support 1. The support 1 primarily ensures that the wood or tool moves in a straight line during cutting operations, and also functions as a ruler. The support 1 is generally installed on a workbench and connected to the workbench via a locking mechanism. It also facilitates disassembly, locking, and position adjustment. The support 1 used in this embodiment is existing technology, and its specific structure will not be described in detail.

[0036] See also Figure 1 In this embodiment, a locking handle 4 is hinged above the fixed bracket 3 via a second rotating shaft 6. A first rotating shaft 5 is provided on the outside of the second rotating shaft 6. The first rotating shaft 5 is connected to one end of the transmission shaft 7, and the other end of the transmission shaft 7 is connected to one end of the lower moving plate 10 located inside the backrest 1. A sliding locking block 13 is installed below the other end of the lower moving plate 10.

[0037] In this embodiment, the fixed bracket 3 is made of metal. One end is fixed to the bottom of the support 1, and the other end is provided with a mounting base. The mounting base and the locking handle 4 are hinged together by the first pivot 5. The locking handle 4 serves as the operating handle for locking or unlocking the support 1.

[0038] The lower movable plate 10 is set in the groove on the bottom surface of the support plate 1, and one end of the fixed bracket 3 is fastened and fixed to the outside of the groove of the support plate 1. The groove of the support plate 1 can guide and limit the lower movable plate 10. At the same time, combined with the enclosure and support of the fixed bracket 3, it can better ensure the lateral sliding performance of the lower movable plate 10 and also avoid longitudinal displacement.

[0039] With the above structural arrangement, the lower moving plate 10 can drive the sliding locking block 13 along... Figure 1 The arrow shown moves in the opposite direction.

[0040] When the locking handle 4 in this embodiment is rotated inward to the locked state, the sliding locking block 13 is pushed inward by the transmission shaft 7, and the distance between the sliding locking block 13 and the fixed locking block 2 decreases, thus locking and fixing the support 1. At this time, the sliding locking block 13 and the fixed locking block 2 cooperate to clamp together, which can fix the support 1 to the worktable.

[0041] When the locking handle 4 is rotated outward to the open position, the sliding locking block 13 is pushed outward through the transmission shaft 7, increasing the distance between the sliding locking block 13 and the fixed locking block 2, thus loosening the support 1. At this time, the sliding locking block 13 and the fixed locking block 2 are relatively separated, allowing the support 1 to be released from the worktable, facilitating the movement and disassembly of the support 1.

[0042] like Figures 2-4 As shown, the lower moving plate 10 in this embodiment includes a lower moving plate bracket 11 and a lower moving plate intermediate body 12. One end of the lower moving plate bracket 11 is connected to the drive shaft 7, and the other end of the lower moving plate bracket 11 is fixed to one end of the lower moving plate intermediate body 12. A sliding locking block 13 is installed on the other end of the lower moving plate intermediate body 12.

[0043] In this embodiment, the sliding locking block 13 and the lower moving plate intermediate body 12 are an integral structure. The lower moving plate intermediate body 12 is mainly used for the transmission of the sliding locking block 13. That is, when the locking handle 4 is rotated, it first drives the transmission shaft 7 to move, and then the transmission shaft 7 pushes the lower moving plate bracket 11 and the lower moving plate intermediate body 12 to move, and finally pushes the sliding locking block 13 to move. In addition, the sliding groove of the lower moving plate bracket 11 and the backing 1, through guidance and limiting, also ensures that the sliding locking block 13 slides stably and will not wobble or deviate.

[0044] See Figure 1 As shown, a radial first through hole is opened in the middle of the first rotating shaft 5, the end of the transmission shaft 7 passes through the first through hole, and adjustable nuts 8 are installed on the transmission shaft 7 on both sides of the first through hole.

[0045] In this embodiment, by adjusting the position of the nut 8 installed on the drive shaft 7, the distance between the first rotating shaft 5 and the lower moving plate 10 can be adjusted, thereby adjusting the locking force and making it convenient to use.

[0046] In this embodiment, a third rotating shaft 9 is installed on the lower movable plate. A radial second through hole is opened in the middle of the third rotating shaft 9. The end of the transmission shaft 7 passes through the second through hole. Fixed or adjustable nuts are installed on the transmission shaft 7 on both sides of the second through hole.

[0047] The structure of the first rotating shaft 5, the third rotating shaft 9 and the transmission shaft 7 is designed to achieve the purpose of locking the handle 4 by rotating and pushing the sliding locking block 13 to lock or release the backrest 1.

[0048] When the locking handle 4 is rotated inward to the locked position, the center height of the first rotating shaft 5 is lower than the center height of the second rotating shaft 6, forming a self-locking angle α of the locking handle. This self-locking angle α ranges from 1 to 20°. Utilizing the formed self-locking angle, the greater the axial force, the tighter the lock, and the locking handle 4 will not spring open.

[0049] Compared to existing locking structures such as the downward-pressing type and the outward-folding locking type, which place the locking handle on the outside after locking, taking up space and being easily touched and causing it to pop open, the locking handle 4 of this invention folds inside the backrest 1 in the locked state, taking up no space and being less likely to be touched. This prevents the backrest 1 from shifting during use, ensuring the cutting accuracy and safety of the power tool.

[0050] All technical contents not described in detail in this utility model are publicly known technologies.

Claims

1. A locking mechanism for a power tool, comprising a fixed locking block, characterized in that, The fixed locking block is installed below one end of the support wall, and a fixed bracket is installed at the other end of the support wall. A locking handle is hinged to the top of the fixed bracket via a second rotating shaft. A first rotating shaft is provided outside the second rotating shaft of the locking handle. One end of the first rotating shaft is connected to a drive shaft, and the other end of the drive shaft is connected to one end of a lower moving plate located inside the support wall. A sliding locking block is installed below the other end of the lower moving plate. When the locking handle is rotated inward to the locked state, the drive shaft pushes the sliding locking block inward, reducing the distance between the sliding locking block and the fixed locking block and locking the support wall in place. When the locking handle is rotated outward to the open state, the drive shaft pushes the sliding locking block outward, increasing the distance between the sliding locking block and the fixed locking block and releasing the support wall.

2. The backing locking mechanism for power tools according to claim 1, characterized in that, The lower movable plate includes a lower movable plate bracket and a lower movable plate intermediate body. One end of the lower movable plate bracket is connected to the drive shaft, and the other end of the lower movable plate bracket is fixed to one end of the lower movable plate intermediate body. A sliding locking block is installed on the other end of the lower movable plate intermediate body.

3. The backing locking mechanism for power tools according to claim 1, characterized in that, The first rotating shaft has a radial first through hole in the middle, the end of the drive shaft passes through the first through hole, and adjustable nuts are installed on the drive shaft on both sides of the first through hole.

4. The backing locking mechanism for power tools according to claim 1, characterized in that, A third rotating shaft is mounted on the lower movable plate. A radial second through hole is opened in the middle of the third rotating shaft. The end of the drive shaft passes through the second through hole. Fixed or adjustable nuts are installed on the drive shaft on both sides of the second through hole.

5. The backing locking mechanism for power tools according to claim 1, characterized in that, When the locking handle is rotated inward to the locked state, the height of the first rotating shaft is lower than the height of the second rotating shaft, forming the self-locking angle of the locking handle.

6. The backing locking mechanism for power tools according to claim 5, characterized in that, The self-locking angle is in the range of 1-20°.

7. The backing locking mechanism for power tools according to claim 1, characterized in that, The lower movable plate is set in the sliding groove on the bottom surface of the mountain, and one end of the fixed bracket is fastened and fixed to the outside of the sliding groove on the mountain.

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