Bottom plate adjusting mechanism of jig saw

Abstract

The utility model discloses a bottom plate adjusting mechanism of a jig saw, a connecting bolt is connected to a bottom plate, the bottom plate is connected to a gearbox of the jig saw through the connecting bolt, an adjusting mechanism assembly is arranged between the bottom plate and the connecting bolt, the adjusting mechanism assembly comprises a pressing plate, a locking block and a sunk screw, an annular tooth part is arranged at the lower end of the connecting bolt, and the locking block is connected with the annular tooth part. Outer teeth are arranged on the peripheral wall of the annular tooth part, locking angles matched with the outer teeth in a clamped mode are arranged on the locking blocks, and after the countersunk head screw is screwed, the locking blocks are connected to the lower end face of the annular tooth part in a pressed mode, the locking angles are matched with the outer teeth in a clamped mode, so that relative rotation of the connecting bolt and the pressing plate is limited, and rotation-stopping fixed connection of the connecting bolt and the pressing plate is achieved. The adjusting mechanism assembly is matched with the connecting bolt, rotation stopping fixed connection of the connecting bolt relative to the bottom plate is achieved, when the cutting angle of the bottom plate is locked, the locking angle of the locking block is matched with the outer teeth of the connecting bolt in a clamped mode, and the reliability of rotation stopping connection of the connecting bolt and the pressing plate is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a base plate adjustment mechanism for a jigsaw. Background Technology

[0002] A jigsaw is an electric tool that cuts materials through the reciprocating motion of a saw blade. It is widely used for straight or curved processing of materials such as wood, metal, and plastic. Its core advantage lies in its flexible and adjustable base plate structure, which can adapt to different angles and working conditions. As a key component connecting the machine body and the base plate, the quick-clamp structure of the base plate plays a crucial role in fixing the base plate, transmitting power, and adjusting the cutting angle. This structure typically consists of connecting bolts, pressure plates, washers, and locking screws. The jigsaw body includes a gearbox, and the quick-clamp structure of the base plate allows for convenient adjustment of the gearbox angle relative to the base plate (i.e., adjustment of the cutting angle), while ensuring a reliable connection between the base plate and the gearbox during cutting.

[0003] For example, a jigsaw and its quick-clamp structure for the base plate are disclosed in Chinese Utility Model Patent (Authorization Announcement No.: CN208276285U). The base plate includes a base plate with an adjustment hole. The base plate is connected to the jigsaw's gearbox via a connecting assembly. The connecting assembly includes a self-locking component and a connecting bolt. The self-locking component cooperates with the base plate to restrict the rotation of the connecting bolt. The self-locking component includes a pressure plate and a second countersunk screw. The second countersunk screw passes through a first washer and is threaded into the threaded hole. After the second countersunk screw is tightened, the first washer presses against the outer surface of the head of the connecting bolt, thereby fixing the connecting bolt to the pressure plate.

[0004] However, the jigsaw and its quick-clamp structure disclosed in the prior art have the following drawbacks: In actual working scenarios, jigsaws are often subjected to high-frequency vibration. Under these conditions, the pressing fit between the first washer and the head end face of the locking bolt is prone to failure. This failure can cause the locking bolt to rotate, which in turn can further loosen the pressure plate, adversely affecting the stable operation and reliability of the jigsaw.

[0005] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0006] The purpose of this utility model is to address the defects and shortcomings of the existing technology by providing a base plate adjustment mechanism for a jigsaw. The adjustment mechanism assembly includes a pressure plate, a locking block, and countersunk screws. By cooperating with the connecting bolts, the connecting bolts and the pressure plate can be fixedly connected to prevent rotation, thus avoiding the loosening of the pressure plate during use.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A base plate adjustment mechanism for a jigsaw includes a connecting bolt connected to the base plate. An adjustment mechanism assembly is disposed between the base plate and the connecting bolt. The adjustment mechanism assembly includes a pressure plate, a locking block, and a countersunk screw. The pressure plate has through holes and threaded holes spaced apart. The connecting bolt passes through the through holes and the base plate sequentially and is connected to a wrench so that the upper end face of the pressure plate is in contact with the lower end face of the base plate. The wrench has a locking hole, and a nut is fixedly connected to the locking hole to prevent rotation. The nut is threadedly connected to the connecting bolt. The lower end of the connecting bolt is provided with a ring tooth portion. The lower end face of the pressure plate is in contact with the upper end face of the ring tooth portion. The outer peripheral wall of the ring tooth portion is provided with external teeth. The locking block is provided with a locking angle that engages with the external teeth. The countersunk screw passes through the locking block and is threaded into the threaded hole. When the countersunk screw is tightened, the locking block presses against the lower end face of the ring tooth portion, and the locking angle engages with the external teeth, thereby restricting the relative rotation of the connecting bolt and the pressure plate, and realizing the anti-rotation fixed connection between the connecting bolt and the pressure plate.

[0009] Furthermore, the base plate includes a first plate body having an upwardly raised protrusion, the protrusion being provided with an adjustment hole for a connecting bolt to pass through, and the adjustment hole extending along the width direction of the protrusion.

[0010] Furthermore, the shape of the end face of the pressure plate that fits against the protrusion is adapted to the shape of the inner wall of the protrusion.

[0011] Furthermore, the base plate also includes a second plate disposed below the first plate, and the first plate and the second plate are detachably connected.

[0012] Furthermore, a protective plate is provided below the second plate.

[0013] Furthermore, the protrusion is provided with a scale indicating the angle of the base plate.

[0014] Furthermore, the protrusion is provided with spaced-apart locking teeth, and the bottom of the gearbox of the jigsaw is provided with locking pins that engage with the locking teeth.

[0015] Furthermore, a washer is fitted around the outer periphery of the connecting bolt, and the washer is positioned between the wrench and the gearbox of the jigsaw.

[0016] Furthermore, the lower end face of the pressure plate is provided with an arc-shaped protrusion. When the countersunk screw is tightened, the pressure plate presses against the upper end face of the locking block through the arc-shaped protrusion.

[0017] The beneficial effects of this utility model after adopting the above structure are as follows: The base plate adjustment mechanism of the jigsaw described in this utility model has a connecting bolt connected to the base plate, and an adjustment mechanism assembly is provided between the base plate and the connecting bolt. The adjustment mechanism assembly includes a pressure plate, a locking block, and a countersunk screw. The lower end of the connecting bolt is provided with a ring tooth portion, and the outer peripheral wall of the ring tooth portion is provided with external teeth. The locking block is provided with a locking angle that engages with the external teeth. When the countersunk screw is tightened, the locking block presses against the lower end face of the ring tooth portion, and the locking angle engages with the external teeth, thereby restricting the relative rotation between the connecting bolt and the pressure plate and realizing the anti-rotation fixed connection between the connecting bolt and the pressure plate. The adjustment mechanism assembly of this utility model works with the connecting bolt to achieve a fixed anti-rotation connection between the connecting bolt and the base plate. When the cutting angle of the base plate is locked, the locking angle of the locking block engages with the external teeth of the connecting bolt, which greatly improves the reliability of the anti-rotation connection between the connecting bolt and the pressure plate, avoids the base plate from loosening due to the rotation of the connecting bolt, and improves the safety of using the jigsaw. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0021] Figure 3 This is the utility model Figure 2 Enlarged schematic diagram of the structure at point A;

[0022] Figure 4 This is an exploded view of the overall structure of this utility model;

[0023] Figure 5 This is a three-dimensional schematic diagram of the connecting bolt of this utility model;

[0024] Figure 6 This is a three-dimensional schematic diagram of the locking block of this utility model;

[0025] Figure 7 This is a schematic diagram of the connection of the connecting bolt, locking block and countersunk screw of this utility model;

[0026] Figure 8 This is a three-dimensional schematic diagram of the pressure plate of this utility model;

[0027] Figure 9 This is a three-dimensional schematic diagram of the first plate of this utility model;

[0028] Figure 10 This is a three-dimensional schematic diagram of the gearbox of this utility model.

[0029] Figures 1 to 10 The winning number is:

[0030] 1. Base plate; 11. Adjustment hole; 12. First plate; 121. Protrusion; 1211. Scale; 1212. Snap tooth; 13. Second plate; 131. Clearance hole; 2. Adjustment mechanism assembly; 21. Pressure plate; 211. Through hole; 212. Threaded hole; 213. Arc-shaped protrusion; 22. Locking block; 221. Locking angle; 23. Countersunk screw; 3. Connecting bolt; 31. Ring tooth; 311. External tooth; 4. Wrench; 41. Snap hole; 5. Nut; 6. Washer; 7. Protective plate; 100. Gearbox; 101. Snap post; 102. Mounting hole. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0032] In the description of this utility model, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, the term "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In this utility model, unless otherwise explicitly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0037] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] like Figures 1 to 10As shown, a base plate adjustment mechanism for a jigsaw includes a base plate 1 connected to a connecting bolt 3, which connects the base plate 1 to the jigsaw's gearbox 100. An adjustment mechanism assembly 2 is provided between the base plate 1 and the connecting bolt 3. The adjustment mechanism assembly 2 includes a pressure plate 21, a locking block 22, and a countersunk screw 23. The pressure plate 21 has a through hole 211 and a threaded hole 212 spaced apart. The connecting bolt 3 passes through the through hole 211, the base plate 1, and the gearbox 100 in sequence before connecting to a wrench 4, so that the upper end face of the pressure plate 21 is in contact with the lower end face of the base plate 1. The wrench 4 has a locking hole 41, and a nut 5 is connected in the locking hole 41 to prevent rotation. The nut 5... The connecting bolt 3 is threaded, and the lower end of the connecting bolt 3 is provided with a ring tooth portion 31. The lower end face of the pressure plate 21 is in contact with the upper end face of the ring tooth portion 31. The outer peripheral wall of the ring tooth portion 31 is provided with external teeth 311. The locking block 22 is provided with a locking angle 221 that engages with the external teeth 311. The countersunk screw 23 passes through the locking block 22 and is threadedly connected to the threaded hole 212. When the countersunk screw 23 is tightened, the locking block 22 presses against the lower end face of the ring tooth portion 31, and the locking angle 221 engages with the external teeth 311, thereby restricting the relative rotation of the connecting bolt 3 and the pressure plate 21, and realizing the anti-rotation fixed connection between the connecting bolt 3 and the pressure plate 21.

[0039] Based on the above embodiments, this utility model provides a base plate adjustment mechanism for a jigsaw. A connecting bolt 3 is connected to the base plate 1, and the base plate 1 is connected to the gearbox 100 of the jigsaw via the connecting bolt 3. An adjustment mechanism assembly 2 is provided between the base plate 1 and the connecting bolt 3. The adjustment mechanism assembly 2 includes a pressure plate 21, a locking block 22, and a countersunk screw 23. The lower end of the connecting bolt 3 is provided with a ring tooth portion 31, and the outer peripheral wall of the ring tooth portion 31 is provided with external teeth 311. The locking block 22 is provided with a locking angle 221 that engages with the external teeth 311. When the countersunk screw 23 is tightened, the locking block 22 presses against the lower end face of the ring tooth portion 31, and the locking angle 221 engages with the external teeth 311, thereby restricting the relative rotation between the connecting bolt 3 and the pressure plate 21, and realizing the anti-rotation fixed connection between the connecting bolt 3 and the pressure plate 21. The adjustment mechanism component 2 of this utility model cooperates with the connecting bolt 3 to achieve a fixed anti-rotation connection between the connecting bolt 3 and the base plate 1. When the cutting angle of the base plate 1 is locked, the locking angle 221 of the locking block 22 engages with the external teeth 311 of the connecting bolt 3, which greatly improves the reliability of the anti-rotation connection between the connecting bolt 3 and the pressure plate 21, avoids the base plate 1 from loosening due to the rotation of the connecting bolt 3, and improves the safety of using the jigsaw.

[0040] In this embodiment, the gearbox 100 is part of the jigsaw body and is the core transmission component of the jigsaw. Its main function includes power conversion and transmission through a gear set, that is, changing the high-speed, low-torque power output from the motor to a low-speed, high-torque power suitable for the saw blade. Structurally, as a core structural component used to connect the jigsaw body and the base plate 1, the gearbox 100 is located on the top of the base plate 1, and the bottom of the gearbox 100 is provided with an arc-shaped surface that matches the protrusion 121 of the first plate 12. The gearbox 100 is provided with a mounting hole 102 for the connecting bolt 3 to pass through. The connecting bolt 3 passes through the through hole 211, the adjustment hole 11, and the mounting hole 102 of the gearbox 100 in sequence before connecting to the wrench 4. The locking hole 41 of the wrench 4 has a hexagonal structure, which matches the head of the connecting bolt 3 to achieve an anti-rotation connection between the wrench 4 and the nut 5.

[0041] In this embodiment, the installation process of the base plate 1 is as follows: First, the base plate 1 is placed below the gearbox 100. Then, the connecting bolts 3 are passed sequentially through the through hole 211 of the pressure plate 21, the adjustment hole 11 of the base plate 1, the mounting hole 102 of the gearbox 100, and the washer 6, and then threadedly connected to the nut 5 inside the wrench 4. The connecting bolts 3 are tightened to ensure that the pressure plate 21, the base plate 1, and the gearbox 100 fit tightly together, thereby ensuring the connection strength and stability between the base plate 1 and the gearbox 100. Finally, the purpose of fixing the base plate 1 and the gearbox 100 is achieved. Figure 2 and Figure 3 As shown; then, the countersunk screw 23 is passed through the locking block 22 and threaded into the threaded hole 212 of the pressure plate 21, so that one end of the locking block 22 is pressed against the lower end face of the ring tooth part 31, and the other end of the locking block 22 is pressed against the arc-shaped protrusion 213 of the pressure plate 21. The locking angle 221 of the locking block 22 engages with the outer tooth 311 of the ring tooth part 31, thereby achieving a non-rotational connection between the connecting bolt 3 and the pressure plate 21, preventing the base plate 1 from loosening due to the rotation of the connecting bolt 3. Figure 4 and Figure 7 As shown. The angle adjustment process of the base plate 1 is as follows: Loosen the wrench 4, and the nut 5, which is engaged with the locking hole 41 of the wrench 4 to prevent rotation, rotates with the wrench 4. The connecting bolt 3 moves downward under the drive of the nut 5, so that the base plate 1 is separated from the gearbox 100. The locking pin 101 is removed from the locking tooth part 1212, and the base plate 1 is adjusted to a suitable angle. Then, the locking pin 101 is locked into the locking tooth part 1212, and then the wrench 4 is tightened, thereby fixing the base plate 1 again. During the adjustment process, the adjustment mechanism assembly 2 moves up and down synchronously with the connecting bolt 3.

[0042] As another preferred embodiment of this utility model, the base plate 1 includes a first plate body 12, the first plate body 12 having an upwardly raised protrusion 121, the protrusion 121 being provided with an adjustment hole 11 for the connecting bolt 3 to pass through, and the adjustment hole 11 extending along the width direction of the protrusion 121. The shape of the end face of the pressure plate 21 that fits against the protrusion 121 is adapted to the shape of the inner wall of the protrusion 121. The base plate 1 also includes a second plate body 13 disposed below the first plate body 12, the first plate body 12 and the second plate body 13 being detachably connected. A protective plate 7 is disposed below the second plate body 13. The protrusion 121 is provided with a scale 1211 for marking the angle of the base plate 1. The protrusion 121 is provided with spaced-apart locking teeth 1212, and the bottom of the gearbox 100 is provided with a locking post 101 that engages with the locking teeth 1212. In this embodiment, as Figure 4 As shown, the base plate 1 has a split structure. The first plate 12 is used to connect with the gearbox 100, and the second plate 13 is used to contact the workpiece during use. The protrusion 121 on the first plate 12 has an arched structure, and the end face connecting the gearbox 100 and the base plate 1 is set as an arc surface. The curvature of the arc surface is the same as the curvature of the arch structure. By cooperating with the arch structure, the processing angle of the base plate 1 can be effectively adjusted. The protective plate 7 is provided to prevent the bottom from being scratched and to improve the service life of the base plate 1. Both the second plate 13 and the protective plate 7 are provided with clearance holes 131 at the positions corresponding to the connecting bolts 3, which can allow the connecting bolts 3 to smoothly enter the interior of the protrusion 121, thus making the installation more convenient.

[0043] In this embodiment, the protrusion 121 is provided with a scale 1211 for marking the angle of the base plate 1. The scale 1211 is provided to improve the accuracy and convenience of adjustment, thereby effectively improving the efficiency of adjustment.

[0044] In another preferred embodiment of this utility model, a washer 6 is fitted around the outer periphery of the connecting bolt 3, and the washer 6 is disposed between the wrench 4 and the gearbox 100. In this embodiment, as... Figure 3 and Figure 4 As shown, the gasket 6 can effectively improve the locking strength, prevent the wrench 4 from loosening after long-term use, and ensure the accuracy of the position of the base plate 1.

[0045] As another preferred embodiment of this utility model, the lower end face of the pressure plate 21 is provided with an arc-shaped protrusion 213. When the countersunk screw 23 is tightened, the pressure plate 21 presses against the upper end face of the locking block 22 through the arc-shaped protrusion 213. In this embodiment, as... Figure 3 and Figure 8As shown, when the countersunk screw 23 is tightened, one end of the locking block 22 presses against the lower end face of the ring tooth portion 31, and the other end of the locking block 22 presses against the arc-shaped protrusion 213 of the pressure plate 21, thereby realizing the fixed connection between the connecting bolt 3, the locking block 22 and the pressure plate 21.

[0046] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A base plate adjustment mechanism for a jigsaw, wherein a connecting bolt (3) is connected to a base plate (1), and an adjustment mechanism assembly (2) is provided between the base plate (1) and the connecting bolt (3), the adjustment mechanism assembly (2) including a pressure plate (21), a locking block (22) and a countersunk screw (23), the pressure plate (21) having a through hole (211) and a threaded hole (212) spaced apart, the connecting bolt (3) passing through the through hole (211) and the base plate (1) in sequence and then connected to a wrench (4), so that the upper end face of the pressure plate (21) fits against the lower end face of the base plate (1); the wrench (4) is provided with a locking hole (41), a nut (5) is connected in the locking hole (41) to prevent rotation, and the nut (5) is threadedly connected to the connecting bolt (3), characterized in that: The lower end of the connecting bolt (3) is provided with a ring tooth (31), the lower end face of the pressure plate (21) is in contact with the upper end face of the ring tooth (31), the outer peripheral wall of the ring tooth (31) is provided with external teeth (311), the locking block (22) is provided with a locking angle (221) that engages with the external teeth (311), the countersunk screw (23) passes through the locking block (22) and is threadedly connected to the threaded hole (212). When the countersunk screw (23) is tightened, the locking block (22) presses against the lower end face of the ring tooth (31), and the locking angle (221) engages with the external teeth (311), thereby restricting the relative rotation of the connecting bolt (3) and the pressure plate (21) and realizing the anti-rotation fixed connection between the connecting bolt (3) and the pressure plate (21).

2. The base plate adjustment mechanism for a jigsaw according to claim 1, characterized in that: The base plate (1) includes a first plate body (12) having an upwardly raised protrusion (121) with an adjustment hole (11) through which a connecting bolt (3) passes, and the adjustment hole (11) extending along the width direction of the protrusion (121).

3. The base plate adjustment mechanism for a jigsaw according to claim 2, characterized in that: The shape of the end face of the pressure plate (21) that fits against the protrusion (121) is adapted to the shape of the inner wall of the protrusion (121).

4. The base plate adjustment mechanism for a jigsaw according to claim 2, characterized in that: The base plate (1) also includes a second plate (13) disposed below the first plate (12), and the first plate (12) and the second plate (13) are detachably connected.

5. The base plate adjustment mechanism for a jigsaw according to claim 4, characterized in that: A protective plate (7) is provided below the second plate (13).

6. The base plate adjustment mechanism for a jigsaw according to claim 2, characterized in that: The protrusion (121) is provided with a scale (1211) indicating the angle of the base plate (1).

7. The base plate adjustment mechanism for a jigsaw according to claim 2, characterized in that: The protrusion (121) is provided with spaced-apart teeth (1212), and the bottom of the gearbox (100) of the jigsaw is provided with a snap-fit ​​post (101) that engages with the teeth (1212).

8. The base plate adjustment mechanism for a jigsaw according to claim 1, characterized in that: A washer (6) is fitted around the outer periphery of the connecting bolt (3), and the washer (6) is positioned between the wrench (4) and the gearbox (100) of the jigsaw.

9. The base plate adjustment mechanism for a jigsaw according to claim 1, characterized in that: The lower end face of the pressure plate (21) is provided with an arc-shaped protrusion (213). When the countersunk screw (23) is tightened, the pressure plate (21) presses against the upper end face of the locking block (22) through the arc-shaped protrusion (213).

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