Self-locking drill bit connecting device
By using a self-locking drill bit connection device, the problem of complex and unstable drill bit connection is solved by cooperating with the locking bevel and screw, achieving efficient and stable drill bit replacement and fixing effect.
Patent Information
- Application Number
- CN202520449435.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-14
AI Technical Summary
Existing drill bit connection devices are complex to replace and are not stable enough under high load or high speed operation, making them prone to loosening.
A self-locking drill bit connection device is adopted. By adding a connecting rod between the drill bit and the drill body, and using the cooperation of the locking bevel and screw, a stable connection between the drill bit and the square sleeve is achieved. The threaded structure of the locking bevel and the inner wall of the screw hole increases the locking force.
It enables simple and efficient installation and removal of drill bits, making the replacement process convenient and improving work efficiency. It also maintains stability under high load or high speed operation, reducing the risk of loosening.
Smart Images
Figure CN223902973U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a self -locking drill bit connecting device. BACKGROUND
[0002] Drill bits such as hand drills and electric drills, drill bits are all detachable designs to facilitate the replacement of different drill bits according to different tasks. In order to facilitate replacement, the existing drill bits need to be fixed with multiple screws and clamping structures, such as using a hexagonal sleeve as a connecting piece of the electric drill body and the drill bit. This way increases the complexity of replacing the drill bit.
[0003] Therefore, a self-locking drill bit connecting device that is more secure and stable is needed. SUMMARY
[0004] The utility model discloses a kind of self-locking drill bit connecting devices, increase connecting rod between drill bit and electric drill body, cooperate locking slope, utilize the force of upper screw to locking slope, drill bit is fixed on four square sleeves, it is convenient to replace, and the purpose of the utility model is achieved as follows:
[0005] The utility model relates to a self-locking drill bit connecting device, including drill bit, connecting rod and four square sleeves, the connecting rod includes triangular face connecting rod and taper handle, the triangular face connecting rod includes arc face and interface, the drill bit is installed with arc face and interface, the taper handle is installed with the handle interface of four square sleeves, the taper handle includes locking slope, the locking slope is located between triangular face connecting rod and taper handle, the angle of locking slope and horizontal plane is 2 degrees, four square sleeves are equipped with screw hole corresponding with locking slope.
[0006] In order to be more convenient to fix, the screw hole inner wall is equipped with thread.
[0007] In order to be adapted with electric drill or hand-held electric drill, the four square sleeves further include four square interfaces.
[0008] In order to be further fixed with electric drill or hand-held electric drill, bolt hole is arranged in the four square sleeves.
[0009] In order to strengthen the fixed effect, the taper ratio of the taper handle is 1:20.
[0010] Compared with prior art, the utility model has the advantages that: the device is simple and efficient in the fixing process of drill bit by the cooperation of locking slope and screw, and the installation and fixation of drill bit can be completed by tightening screw, and it is convenient to quickly disassemble and replace, and work efficiency is improved.
[0011] The angle of the locking bevel is set to 2 degrees, and the thread structure of the inner wall of the screw hole effectively increases the locking force, so that the drill bit is fixed more firmly, especially in the case of high load or high speed operation, the stability of the drill bit can be maintained, and loosening caused by vibration or impact is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 Fig. 1 is a schematic view of an axial cross section of a self-locking drill bit connecting device;
[0013] Figure 2 Fig. 2 is a schematic view of a cross section along A-A in Fig. 1; Figure 1
[0014] Figure 3 Fig. 3a is a schematic view of a side view of a self-locking drill bit connecting device, Fig. 3b is a schematic view of a cross section along B-B in Fig. 3a, and Fig. 3c is a schematic view of the force on the locking bevel after installation;
[0015] Figure 4 Fig. 4 is a schematic view of an axial cross section of another embodiment of a self-locking drill bit connecting device;
[0016] Figure 5 Fig. 5 is a schematic view of an axial cross section of still another embodiment of a self-locking drill bit connecting device;
[0017] In the figure: 1, drill bit; 2, triangular face connecting rod; 3, screw hole; 4, handle interface; 5, square sleeve; 6, square interface; 7, connecting rod; 8, tapered handle; 9, locking bevel; 10, interface; 11, circular arc face; 12, bolt hole. DETAILED DESCRIPTION
[0018] In order to deepen the understanding of the present application, the present application will be further described in conjunction with the embodiments and the drawings, which are only used to explain the present application and do not constitute a limitation on the protection scope of the present application.
[0019] Please refer to Figures 1-3 The embodiment of the present application relates to a self-locking drill bit 1 connecting device, which comprises a drill bit 1, a connecting rod 7 and a square sleeve 5. The connecting rod 7 comprises a triangular face connecting rod 2 and a tapered handle 8. The triangular face connecting rod 2 comprises a circular arc face 11 and an interface 10. The drill bit 1 is installed in close contact with the circular arc face 11 and the interface 10. The tapered handle 8 is installed in close contact with the handle interface 4 of the square sleeve 5. The tapered handle 8 comprises a locking bevel 9. The locking bevel 9 is arranged between the triangular face connecting rod 2 and the tapered handle 8. The angle between the locking bevel 9 and the horizontal plane is 2 degrees. The square sleeve 5 is provided with a screw hole 3 corresponding to the locking bevel 9. By increasing the connecting rod 7 between the drill bit 1 and the electric drill body, cooperating with the locking bevel 9, and using the force of the upper screw on the locking bevel 9, the drill bit 1 is fixed on the square sleeve 5, which is convenient for replacement.
[0020] In a possible use scenario, various drilling operations such as wood drilling are carried out using an electric drill or a handheld electric drill, and since the working environment is relatively complex, frequent replacement of the drill bit 1 is a common requirement, and the traditional connection mode is often not stable enough, which can easily cause the drill bit 1 to loosen or be inefficiently replaced. The self-locking drill bit 1 connecting device of the utility model can be easily installed and replaced by the operator by tightening the screw, ensuring stable connection and improving work efficiency, especially in high-strength and high-frequency use environments, which can significantly reduce the safety hazards caused by the loosening of the drill bit 1.
[0021] Specifically, the locking slope 9 cooperates with the screw to make the fixing process of the drill bit 1 simple and efficient, and the installation and fixation of the drill bit 1 can be completed by tightening the screw, and the drill bit 1 can be quickly disassembled and replaced, improving work efficiency. In addition, please refer to Figure 3 c figure in the figure, the screw and the slope cooperate to provide radial and axial fastening force, and the angle of the locking slope 9 is set to 2 degrees, which effectively increases the locking force, so that the drill bit 1 is fixed more firmly, especially in the case of high load or high speed operation, the stability of the drill bit 1 can be maintained, and the loosening caused by vibration or impact can be reduced.
[0022] In an embodiment, in order to be more convenient for fixing, the inner wall of the screw hole 3 is provided with threads; in order to adapt to the electric drill or the handheld electric drill, the square sleeve 5 further comprises a square interface 6; in order to further fix the electric drill or the handheld electric drill, the square sleeve 5 is provided with a bolt hole 12; in order to strengthen the fixing effect, the taper ratio of the tapered handle 8 is 1:20.
[0023] As shown in Figure 4 and Figure 5 , Figure 4 is an embodiment when the drill bit is a twist drill, Figure 5 is an embodiment when the drill bit is a stepped drill, the device is designed in this way, which can be compatible with various different drill bit designs, and the force of the upper screw on the locking slope can fix the drill bit on the square sleeve, which is convenient for replacement.
[0024] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the utility model and are not limiting, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the utility model, and they should be covered in the scope of the claims of the utility model.
Claims
1. A self-locking drill bit coupling device, characterized by The application relates to a drill bit, a connecting rod and a square sleeve, wherein the connecting rod comprises a triangular surface connecting rod and a tapered handle, the triangular surface connecting rod comprises a circular arc surface and a connecting surface, the drill bit is attached to the circular arc surface and the connecting surface, the tapered handle is attached to the handle interface of the square sleeve, the tapered handle comprises a locking inclined surface, the locking inclined surface is arranged between the triangular surface connecting rod and the tapered handle, the angle between the locking inclined surface and a horizontal plane is 2 degrees, and the square sleeve is provided with a screw hole corresponding to the locking inclined surface.
2. A self-locking drill bit coupling device according to claim 1, wherein, The inner wall of the screw hole is provided with a thread.
3. A self-locking drill bit coupling device as claimed in claim 1, wherein, The square sleeve further comprises a square interface.
4. A self-locking drill bit coupling device according to claim 3, wherein, A bolt hole is arranged in the interior of the square sleeve.
5. A self-locking drill bit coupling device as claimed in claim 1, wherein, The taper ratio of the tapered handle is 1:20.