Fastening device capable of reducing damage to screw fastener

Abstract

The utility model provides a fastening device capable of reducing damage to a screw fastener, and relates to the field of fastening devices. The device comprises a handle and a connecting rod, one end of the connecting rod is connected with the handle, a screwing assembly is arranged at the other end of the connecting rod, a first abutting face and a second abutting face are oppositely arranged on the screwing assembly, the first abutting face comprises an abutting section and a spacing section, the abutting section can be attached to the side wall of the linear groove, and the spacing section can be attached to the side wall of the linear groove. When the abutting section is attached to the side wall of the linear groove, a gap exists between the interval section and the side wall of the linear groove, and the second abutting face and the first abutting face are in central symmetry with the central axis of the connecting rod as the center. According to the screw fastening tool, it can be guaranteed that the enough contact area exists between the fastening tool and the screw fastening piece, and the situation that the groove wall of the linear through groove is crushed and damaged due to the fact that the groove wall bears large pressure is not likely to happen.

Description

Technical Field

[0001] The present application relates to the field of fastening tools, and particularly to a fastening tool for reducing damage to screw fasteners. Background Art

[0002] An existing screw fastener has a straight slot for easy twisting on its screw head, so that a fastening tool can be first inserted into the straight slot and then drive the screw fastener to be tightened or loosened by its own rotation.

[0003] An existing fastening tool generally includes a handle and a connecting rod. One end of the connecting rod is connected to the handle, and a screwing part for inserting into the straight slot is provided at the other end of the connecting rod. The cross-section of the screwing part is rectangular. When the screwing part is inserted into the straight slot, both sides of the screwing part along the width direction will face the side walls of the straight slot.

[0004] However, in order to facilitate the insertion of the screwing part into the straight slot, the width of the existing straight slot is set to be greater than the thickness of the screwing part. When the screwing part is inserted into the straight slot, since there is a gap between both sides of the screwing part along the width direction and the side walls of the straight slot, if the fastening tool is rotated, the edges of the screwing part will contact the side walls of the straight slot, so that the side walls of the straight slot will bear a large pressure and are easily damaged.

[0005] In view of this, it is necessary to provide a fastening tool for reducing damage to screw fasteners. Summary of the Utility Model

[0006] In order to solve the problem that when an existing fastening tool tightens or loosens a screw fastener, the edges of the screwing part will contact the side walls of the straight slot and easily damage the screw fastener, the present application provides a fastening tool for reducing damage to screw fasteners.

[0007] The present application provides a fastening tool for reducing damage to screw fasteners, adopting the following technical solutions: including a handle and a connecting rod, one end of the connecting rod is connected to the handle, a screwing assembly is provided at the other end of the connecting rod, a first abutting surface and a second abutting surface are oppositely arranged on the screwing assembly, the first abutting surface includes an abutting section and a spaced section, the abutting section can be attached to the side wall of the straight slot, and there is a gap between the spaced section and the side wall of the straight slot when the abutting section is attached to the side wall of the straight slot;

[0008] The second abutting surface is centrosymmetric with the first abutting surface about the central axis of the connecting rod.

[0009] By adopting the above technical scheme, since the first abutting surface is provided with an abutting section and a spacing section, and the second abutting surface is symmetrical with the first abutting surface with the central axis of the connecting rod as the center, the distance between the abutting section on the first abutting surface and the abutting section on the second abutting surface in the width direction of the I-shaped through groove is greater than the distance between the spacing section on the first abutting surface and the spacing section on the second abutting surface in the width direction of the I-shaped through groove, so that the user can first insert the fastening device for reducing damage to the screw fastener into the I-shaped through groove on the screw fastener to be screwed, and keep the two abutting sections and the two spacing sections not abutting against the groove wall of the I-shaped through groove, so that the user can easily insert the fastening device into the I-shaped through groove, and then rotate the handle to make the two abutting sections fit with the I-shaped through groove at the same time, so as to ensure that there is sufficient contact area between the fastening device and the screw fastener, and then the groove wall of the I-shaped through groove is not easily crushed or damaged due to the large pressure.

[0010] Specifically, the screwing assembly includes a main rod and two wing plates, one end of the main rod is connected to the connecting rod, and the two wing plates are provided on the rod body of the main rod. The two wing plates are symmetrical with the central axis of the connecting rod as the center, one side surface of each wing plate is formed as the abutment section, and the other side surface of each wing plate is formed as the spacing section.

[0011] By adopting the above technical solution, the screwing assembly can screw the screw fastener by making the plate surface of the wing plate abut against the groove wall of the straight through groove.

[0012] Furthermore, chamfers are provided between the two side plate edges of the wing plate extending along the length direction of the connecting rod and the plate surface of the wing plate.

[0013] By adopting the above technical solution, when the width of the I-shaped through groove to be screwed is greater than the distance between the abutting sections on the two wing plates in the width direction of the I-shaped through groove, if a fastening tool that reduces damage to the screw fastener is used to screw the I-shaped through groove, the chamfer on the edge of the wing plate will abut against the groove wall of the I-shaped through groove, so as to ensure that there is a sufficient contact area between the fastening tool and the screw fastener, thereby making it less likely that the groove wall of the I-shaped through groove will be crushed or damaged by the edges of the wing plates.

[0014] Furthermore, the screwing assembly also includes a driving unit, and two sliding grooves are relatively opened on the rod body of the main rod, and each of the sliding grooves is opened in the horizontal direction. The wing plates correspond to the sliding grooves one by one, and one end of each of the wing plates is inserted into the corresponding sliding groove and is slidably connected to the main rod. The driving unit is transmission-connected to the two wing plates and can drive the two wing plates to move closer to or away from each other.

[0015] By adopting the above technical solution, the user can first drive the two wing plates to approach each other through the driving unit, so as to be able to reduce the distance between the abutting segments on the two wing plates in the width direction of the straight-through slot, thereby facilitating the user to insert the fastening tool into the straight-through slot to be screwed; then drive the two wing plates to move away from each other through the driving unit until the abutting segments on each wing plate are in contact with the slot wall of the straight-through slot, so that the fastening tool that reduces damage to the screw fastener can screw screw fasteners with different slot widths.

[0016] Further, the driving unit includes a driving gear, a rotating disk and a locking member. An installation cavity is provided inside the main rod. The driving gear is arranged in the installation cavity. The rotating disk is arranged in the installation cavity and connected to the driving gear. A rotating hole is formed on the inner wall of the installation cavity. The edge of the rotating disk passes through the rotating hole and extends to the outside;

[0017] Two connection holes are formed on the inner wall of the installation cavity. Driven racks are provided on one side of each wing plate inserted into the corresponding sliding groove. The driven racks correspond to the connection holes one by one. Each driven rack passes through the corresponding connection hole and meshes with the driving gear;

[0018] The locking member is detachably connected to the rotating disk, and the locking member can limit the rotation of the driving gear when connected to the rotating disk.

[0019] By adopting the above technical solution, the user can drive the driving gear to rotate by rotating the rotating disk, and then drive the two wing plates to approach or move away from each other through the cooperation of the driving gear and the driven rack; the user can also rotate the rotating disk by separating the locking member from the rotating disk, or limit the rotation of the driving gear by connecting the locking member to the rotating disk.

[0020] Further, the locking member includes a limiting plate, a mounting rod and a clamping disk. A waist-shaped hole leading to the installation cavity is formed in the main rod body in the vertical direction. A limiting groove is formed on the top wall of the installation cavity. The top of the limiting plate is inserted into the limiting groove. The inner wall of the limiting groove can abut against the limiting plate and limit the rotation of the limiting plate. The bottom of the limiting plate is connected to one end of the mounting rod. The other end of the mounting rod passes through the waist-shaped hole and extends outside the main rod;

[0021] A spline groove is formed on the top of the rotating disk. One side of the clamping disk is connected to the mounting rod, and the other side of the clamping disk can be inserted into the spline groove and key-connected to the spline groove.

[0022] By adopting the above technical solution, the limiting plate can abut against the groove wall of the limiting groove and restrict the rotation of the clamping disc, so that the user can press down the mounting rod to key-connect the clamping disc with the spline groove, thereby restricting the rotation of the rotating disc. The user can also pull up the mounting rod to separate the clamping disc from the spline groove, so that the rotating disc can continue to rotate.

[0023] Further, a compression spring is provided between the limiting plate and the top wall of the limiting groove.

[0024] By adopting the above technical solution, the compression spring can apply a downward force to the limiting plate to ensure that the clamping disc is inserted into the spline groove and key-connected with the spline groove.

[0025] Specifically, anti-slip protrusions are provided on the handle along its length direction.

[0026] By adopting the above technical solution, the anti-slip protrusions can increase the roughness of the handle, facilitating the user to rotate the handle.

[0027] In summary, the present application includes the following beneficial technical effects:

[0028] It includes a handle and a connecting rod. One end of the connecting rod is connected to the handle, and a screwing component is provided at the other end of the connecting rod. A first abutting surface and a second abutting surface are oppositely arranged on the screwing component. The first abutting surface includes an abutting section and a spaced section. The abutting section can fit against the side wall of the straight-slot. When the abutting section fits against the side wall of the straight-slot, there is a gap between the spaced section and the side wall of the straight-slot; the second abutting surface is centrosymmetric with the first abutting surface about the central axis of the connecting rod. Since the first abutting surface is provided with an abutting section and a spaced section, and the second abutting surface is centrosymmetric with the first abutting surface about the central axis of the connecting rod, the distance between the abutting sections on the first abutting surface and the abutting sections on the second abutting surface in the width direction of the straight-through slot is greater than the distance between the spaced sections on the first abutting surface and the spaced sections on the second abutting surface in the width direction of the straight-through slot. So that the user can first insert the fastening tool for reducing damage to the screw fastener into the straight-slot on the screw fastener to be screwed and keep both the two abutting sections and the two spaced sections not abutting against the slot wall of the straight-slot, so as to facilitate the user to insert the present fastening tool into the straight-slot, and then rotate the handle to make the two abutting sections fit against the straight-slot simultaneously, so as to ensure that there is sufficient contact area between the present fastening tool and the screw fastener, and then the slot wall of the straight-slot is not easily damaged or crushed due to bearing a large pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a perspective view of the first embodiment of the present application;

[0030] Figure 2 is alongFigure 1 Schematic cross-sectional view taken along the central axis of the middle connecting rod;

[0031] Figure 3 Front view of the second embodiment of the present application;

[0032] Figure 4 is along Figure 3 Schematic cross-sectional view taken along the A-A direction in

[0033] Figure 5 Isometric view of the third embodiment of the present application;

[0034] Figure 6 is along Figure 5 Schematic cross-sectional view taken along the central axis of the middle connecting rod;

[0035] Figure 7 is along Figure 6 Schematic cross-sectional view taken along the B-B direction in

[0036] Reference numerals: 1, handle; 11, anti-slip protrusion; 2, screwing assembly; 21, main rod; 22, wing plate; 221, abutting section; 222, spaced section; 223, chamfer; 224, driven rack; 23, driving unit; 231, driving gear; 232, rotating disc; 2321, spline groove; 233, locking member; 2331, limiting plate; 2332, mounting rod; 2333, clamping disc; 2334, compression spring; 3, screw fastener; 31, flat slot; 4, connecting rod. Detailed implementation manners

[0037] The following is further elaborated in conjunction with the attached Figure 1 - attached Figure 7 for further elaboration:

[0038] See Figure 1 and Figure 2, in the first embodiment provided by the present application, a fastening tool for reducing damage to screw fasteners includes: a handle 1 and a connecting rod 4. Along the length direction of the handle 1, there are multiple anti-slip protrusions 11 provided to increase the roughness of the handle 1 and facilitate the user to rotate the handle 1. One end of the connecting rod 4 is connected to the handle 1, and a screwing assembly 2 is provided at the other end of the connecting rod 4. A first abutting surface and a second abutting surface are oppositely arranged on the screwing assembly 2; the screwing assembly 2 includes a main rod 21 and two wing plates 22. One end of the main rod 21 is connected to the connecting rod 4, and two wing plates 22 are provided on the rod body of the main rod 21. The two wing plates 22 are centrosymmetric about the central axis of the connecting rod 4. One side plate surface of each wing plate 22 forms an abutting section 221, and the other side plate surface of each wing plate 22 forms a spacing section 222. The abutting section 221 can be attached to the side wall of the flat groove 31. When the abutting section 221 is attached to the side wall of the flat groove 31, there is a gap between the spacing section 222 and the side wall of the flat groove 31.

[0039] Through the above settings, since the two wing plates 22 are centrosymmetric about the central axis of the connecting rod 4, the distance between the abutting sections 221 on the two wing plates 22 in the width direction of the flat through groove is greater than the distance between the spacing sections 222 on the two wing plates 22 in the width direction of the flat through groove, so that the user can first insert the fastening tool for reducing damage to screw fasteners into the flat groove on the screw fastener 3 to be screwed and keep both the two abutting sections 221 and the two spacing sections 222 not in contact with the groove wall of the flat groove, which facilitates the user to insert the fastening tool into the flat groove, and then rotate the handle 1 to make the two abutting sections 221 simultaneously attached to the flat groove, so as to ensure that there is sufficient contact area between the fastening tool and the screw fastener 3, and then the groove wall of the flat groove is not easily damaged or crushed due to bearing a large pressure.

[0040] See Figure 3 and Figure 4 , in the second embodiment provided by the present application, a chamfer 223 is provided between the two side plate edges of the wing plate 22 extending along the length direction of the connecting rod 4 and the plate surface of the wing plate 22. Through the above settings, when the width of the flat groove to be screwed is greater than the distance between the abutting sections 221 on the two wing plates 22 in the width direction of the flat through groove, if the fastening tool for reducing damage to screw fasteners is used to screw the flat groove, then the chamfer 223 on the edge of the wing plate 22 will be in contact with the groove wall of the flat through groove, so as to ensure that there is sufficient contact area between the fastening tool and the screw fastener 3, and then the groove wall of the flat groove is not easily damaged or crushed by the edge of the wing plate 22.

[0041] See Figure 5 and Figure 6, in the third embodiment provided by the present application, the screwing assembly 2 further includes a driving unit 23. Two chutes are oppositely formed on the rod body of the main rod 21, and each chute is formed in the horizontal direction. The wing plates 22 correspond to the chutes one by one. One end of each wing plate 22 is inserted into the corresponding chute and slidably connected to the main rod 21. The driving unit 23 includes a driving gear 231, a rotating disk 232 and a locking member 233. An installation cavity is provided inside the main rod 21. The driving gear 231 is arranged in the installation cavity. The rotating disk 232 is arranged in the installation cavity and connected to the top of the rotating shaft of the driving gear 231. Four rotating holes are formed on the inner wall of the installation cavity. The edge of the rotating disk 232 passes through each rotating hole and extends to the outside. Two connection holes are further formed on the inner wall of the installation cavity. Driven racks 224 are provided on one side of each wing plate 22 inserted into the corresponding chute. The driven racks 224 correspond to the connection holes one by one. Each driven rack 224 passes through the corresponding connection hole and meshes with the driving gear 231.

[0042] See Figure 6 and Figure 7 , the locking member 233 includes a limiting plate 2331, an installation rod 2332 and a clamping disk 2333. A kidney-shaped hole leading to the installation cavity is formed in the rod body of the main rod 21 in the vertical direction. A linear limiting groove is formed on the top wall of the installation cavity. The top of the limiting plate 2331 is inserted into the limiting groove so that the rotation of the limiting plate 2331 can be restricted by the inner wall of the linear limiting groove abutting against the limiting plate 2331. The bottom of the limiting plate 2331 is connected to one end of the installation rod 2332. The other end of the installation rod 2332 passes through the kidney-shaped hole and extends outside the main rod 21. A spline groove 2321 is formed on the top of the rotating disk 232. One side of the clamping disk 2333 is connected to the installation rod 2332. The other side of the clamping disk 2333 can be inserted into the spline groove 2321 and key-connected to the spline groove 2321. A compression spring 2334 is provided between the limiting plate 2331 and the top wall of the limiting groove. The compression spring 2334 can apply a downward force to the limiting plate 2331 to ensure that the clamping disk 2333 is inserted into the spline groove 2321 and key-connected to the spline groove 2321.

[0043] With the above settings, the user can first pull up the installation rod 2332 to separate the clamping disk 2333 from the spline groove 2321, so that the rotating disk 232 can rotate freely. Then, by rotating the rotating disk 232, the driving gear 231 is driven to rotate. Subsequently, through the cooperation of the driving gear 231 and the driven rack 224, the two wing plates 22 are driven to approach each other, so as to be able to reduce the distance between the abutting segments 221 on the two wing plates 22 in the width direction of the straight-through slot, thereby facilitating the user to insert the fastening device into the straight-through slot of the screw fastener to be screwed. Then, by rotating the rotating disk 232 again, the driving gear 231 is driven to rotate. Subsequently, through the cooperation of the driving gear 231 and the driven rack 224, the two wing plates 22 are driven to move away from each other until the abutting segments 221 on each wing plate 22 are in contact with the slot wall of the straight-through slot. Finally, the installation rod 2332 is released, so that the compression spring 2334 inserts the clamping disk 2333 into the spline groove 2321 and is key-connected to the spline groove 2321, thereby restricting the rotation of the rotating disk 232. Finally, by rotating the handle 1, the screw fastener 3 is tightened or loosened, so that the fastening device that reduces damage to the screw fastener can screw the screw fastener 3 with different groove widths.

[0044] It should be noted that the number of splines in the spline groove 2321 can be set to be equal to the number of external teeth on the driving gear 231, so that no matter which angle the driving gear 231 rotates to, the clamping disk 2333 can be key-connected to the spline groove 2321.

[0045] The working principle of a fastening device for reducing damage to screw fasteners in this application during use is specifically as follows:

[0046] Since the two wing plates 22 are centrosymmetric about the central axis of the connecting rod 4, the distance between the abutting segments 221 on the two wing plates 22 in the width direction of the straight-through slot is greater than the distance between the spaced segments 222 on the two wing plates 22 in the width direction of the straight-through slot. So that the user can first insert the fastening device for reducing damage to the screw fastener into the straight-through slot on the screw fastener 3 to be screwed, and keep both the two abutting segments 221 and the two spaced segments 222 not in contact with the slot wall of the straight-through slot, so as to facilitate the user to insert the fastening device into the straight-through slot. Then, by rotating the handle 1, the two abutting segments 221 are simultaneously brought into contact with the straight-through slot, so as to ensure that there is sufficient contact area between the fastening device and the screw fastener 3, and then the slot wall of the straight-through slot is not easily damaged or crushed due to bearing a large pressure.

[0047] It should be noted that the above are all preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A fastening tool for reducing damage to screw fasteners, which is used to be inserted into a straight slot opened on the screw fastener, and is characterized in that: The invention comprises a handle (1) and a connecting rod (4), one end of the connecting rod (4) is connected to the handle (1), and the other end of the connecting rod (4) is provided with a screwing assembly (2), and the screwing assembly (2) is provided with a first abutting surface and a second abutting surface opposite to each other, the first abutting surface comprises an abutting section (221) and a spacing section (222), the abutting section (221) can be fitted with the side wall of the I-shaped groove (31), and when the abutting section (221) is fitted with the side wall of the I-shaped groove (31), a gap exists between the spacing section (222) and the side wall of the I-shaped groove (31); The second abutment surface and the first abutment surface are centrally symmetrical with respect to the central axis of the connecting rod (4).

2. The fastening device for reducing damage to screw fasteners according to claim 1, characterized in that: The screwing assembly (2) comprises a main rod (21) and two wing plates (22), one end of the main rod (21) is connected to the connecting rod (4), the two wing plates (22) are arranged on the rod body of the main rod (21), the two wing plates (22) are centrally symmetrical with the central axis of the connecting rod (4) as the center, one side surface of each wing plate (22) is formed as the abutting section (221), and the other side surface of each wing plate (22) is formed as the spacing section (222).

3. A fastening device for reducing damage to screw fasteners according to claim 2, characterized in that: Chamfers (223) are provided between the two side plate edges of the wing plate (22) extending along the length direction of the connecting rod (4) and the plate surface of the wing plate (22).

4. A fastening device for reducing damage to screw fasteners according to claim 2, characterized in that: The screwing assembly (2) also includes a driving unit (23), two sliding grooves are relatively opened on the rod body of the main rod (21), and each of the sliding grooves is opened in the horizontal direction. The wing plates (22) correspond to the sliding grooves one by one, and one end of each wing plate (22) is inserted into the corresponding sliding groove and is slidably connected to the main rod (21). The driving unit (23) is transmission-connected to the two wing plates (22) and can drive the two wing plates (22) to move closer to or away from each other.

5. A fastening appliance for reducing damage to screw fasteners according to claim 4, characterized in that: The driving unit (23) comprises a driving gear (231), a rotating disk (232) and a locking member (233); a mounting cavity is provided inside the main rod (21); the driving gear (231) is arranged in the mounting cavity; the rotating disk (232) is arranged in the mounting cavity and connected to the driving gear (231); a rotating hole is provided on the inner wall of the mounting cavity; and the edge of the rotating disk (232) extends out to the outside through the rotating hole; Two connection holes are provided on the inner wall of the installation cavity, and a driven rack (224) is provided on one side of each wing plate (22) inserted into the corresponding slide groove, and the driven rack (224) corresponds to the connection holes one by one, and each driven rack (224) passes through the corresponding connection hole and meshes with the driving gear (231); The locking member (233) is detachably connected to the rotating disk (232), and the locking member (233) can limit the rotation of the driving gear (231) when connected to the rotating disk (232).

6. A fastening device for reducing damage to screw fasteners according to claim 5, characterized in that: The locking member (233) includes a limiting plate (2331), a mounting rod (2332) and a clamping disc (2333). A waist-shaped hole leading to the mounting cavity is vertically formed in the rod body of the main rod (21). A limiting groove is formed in the top wall of the mounting cavity. The top of the limiting plate (2331) is inserted into the limiting groove. The inner wall of the limiting groove can abut against the limiting plate (2331) and limit the rotation of the limiting plate (2331). The bottom of the limiting plate (2331) is connected to one end of the mounting rod (2332). The other end of the mounting rod (2332) passes through the waist-shaped hole and extends outside the main rod (21). A spline groove (2321) is formed in the top of the rotating disc (232). One side of the clamping disc (2333) is connected to the mounting rod (2332). The other side of the clamping disc (2333) can be inserted into the spline groove (2321) and is key-connected to the spline groove (2321).

7. A fastening tool for reducing damage to screw fasteners according to claim 6, characterized in that: A compression spring (2334) is provided between the limiting plate (2331) and the top wall of the limiting groove.

8. A fastening device for reducing damage to screw fasteners according to claim 1, characterized in that: Anti-slip protrusions (11) are provided on the handle (1) along its own length direction.

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