Hole opener

Abstract

This utility model belongs to the field of hole-opening tool technology, specifically relating to a hole opener, including a connecting rod and a central drill bit; characterized in that at least two centering rings are provided on the connecting part of the central drill bit, and the connecting rod is provided with a shaft hole to accommodate the connecting part of the central drill bit; the centering rings are inserted into the shaft hole with an interference fit, realizing the connection between the central drill bit and the connecting rod. This hole opener does not require the use of screws to tighten the central drill bit during installation, making installation and disassembly extremely convenient, and ensuring coaxiality to avoid damage to the central drill bit caused by wobbling.

Description

Technical Field

[0001] This utility model relates to the field of hole-opening tools, specifically to a hole opener. Background Technology

[0002] Existing hole openers use a center drill bit at the central axis of the core drill barrel for center positioning. However, installing the center drill bit on the drill rod requires a fixing screw and alignment with the fastening plane on the center drill bit, making installation and disassembly cumbersome. Furthermore, using a single screw to secure the center drill bit cannot guarantee its concentricity, making it prone to wobbling during drilling and potentially damaging it. Summary of the Invention

[0003] In view of the shortcomings of the prior art, this utility model provides a hole opener that does not require the use of screws to tighten the center drill bit during installation, making installation and disassembly extremely convenient, and ensuring coaxiality.

[0004] A hole opener includes a connecting rod and a central drill bit; at least two centering rings are provided on the connecting portion of the central drill bit, and the connecting rod is provided with a shaft hole to accommodate the connecting portion of the central drill bit; the centering rings are inserted into the shaft hole with an interference fit to realize the connection between the central drill bit and the connecting rod.

[0005] The aforementioned hole opener also includes a moving block that provides torque on the connecting part of the central drill bit, and a moving groove that is adapted to the shape of the moving block on the corresponding connecting rod. The moving block is inserted into the moving groove, thereby enabling the connecting rod to drive the central drill bit to rotate.

[0006] In the aforementioned hole opener, the moving block is configured as at least one convex stop block distributed along the outer contour of the connection portion of the central drill bit.

[0007] The aforementioned hole opener has two moving blocks, which are two convex blocks distributed at 180 degrees to the outer contour of the connecting part of the central drill bit.

[0008] The aforementioned hole opener has three moving blocks, which are three convex blocks distributed at 120 degrees to each other on the outer contour of the connecting part of the central drill bit.

[0009] In the aforementioned hole opener, the moving block is located between the two straightening rings.

[0010] The aforementioned hole opener also includes a core drill bit, which is detachably connected to the connecting rod.

[0011] In the aforementioned hole opener, after the core drill bit is connected to the connecting rod, the center drill bit is located at the axis of the core drill bit.

[0012] The beneficial effects of this invention are as follows: By setting two centering rings on the connecting part of the central drill bit, the coaxiality between the central drill bit and the connecting rod can be ensured, preventing swaying during drilling; at the same time, the interference fit installation method avoids the complicated procedure of using screws to align the mounting surface, making installation simple and convenient. In addition, the equidistant distribution of the moving blocks also ensures uniform force during drilling rotation, further reducing the disadvantages of swaying. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 An exploded view of an aperture opener provided in an embodiment of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of a central drill bit provided in an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of a connecting rod provided in an embodiment of the present utility model;

[0017] Figure 4 This is a schematic diagram of the structure of a coring drill bit provided in an embodiment of the present invention;

[0018] Figure 5 for Figure 1 The assembly diagram of the hole opener is shown.

[0019] In the attached diagram, 1 is the connecting rod; 101 is the shaft hole; 102 is the moving groove; 103 is the connecting column; 2 is the center drill bit; 201 is the connecting part; 202 is the centering ring; 203 is the moving block; and 3 is the core drill bit. Detailed Implementation

[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0021] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0022] like Figures 1 to 5As shown, this utility model discloses a hole opener, including a connecting rod 1 and a central drill bit 2; at least two straightening rings 202 are provided on the connecting part 201 of the central drill bit 2, and the connecting rod 1 is provided with a shaft hole 101 for accommodating the connecting part 201 of the central drill bit 2; the straightening rings 202 are inserted into the shaft hole 101 with an interference fit to realize the connection between the central drill bit 2 and the connecting rod 1.

[0023] Of course, the number of straightening rings 202 can be increased; as long as there are two or more, the straightening effect can be achieved. It is not difficult to understand that setting intermittent points or line segments on the connecting part 201 of the central drill bit 2, forming a structure similar to the straightening ring 202, is also a structure to be protected by this utility model, and its function is the same.

[0024] More specifically, one end of the connecting rod 1 is used to connect to the power output end of the electric drill, and the other end is configured as a connecting post 103 with a larger outer diameter than the main body of the connecting rod 1. A shaft hole 101 is provided on the connecting post 103 for accommodating the connecting part 201 of the central drill bit 2.

[0025] In some implementations, such as Figure 1 and Figure 4 As shown, the hole opener also includes a core drill bit 3, which is detachably connected to the connecting rod 1, and can be used... Figure 1 The threaded connection shown can also be achieved using a snap-fit ​​connection.

[0026] When the core drill bit 3 is connected to the connecting rod 1, the center drill bit 2 is located at the axis of the core drill bit 3.

[0027] like Figure 2 As shown, in some embodiments, the connecting portion 201 of the central drill bit 2 is provided with two annular grooves (not shown in the figure), and two centering rings 202 are respectively fitted into the two annular grooves. The centering rings 202 can be rubber sealing rings or metal rings, but their roundness must be ensured.

[0028] The hole opener in the above embodiments, by setting two centering rings 202 on the connecting part 201 of the central drill bit 2, compared with the connection method of only one screw for positioning and locking in the prior art, can ensure the coaxiality between the central drill bit 2 and the connecting rod 1 and avoid swinging during drilling; at the same time, the interference fit installation method can be used, which only requires manual insertion, avoiding the complicated procedure of using screws to align the mounting surface, making the installation simple and convenient.

[0029] like Figure 2 and Figure 3As shown, in some embodiments, the connecting part 201 of the central drill bit 2 is also provided with a moving block 203 that provides torque, and the corresponding connecting rod 1 is provided with a moving groove 102 that matches the shape of the moving block 203. The moving block 203 is inserted into the moving groove 102, so that the connecting rod 1 drives the central drill bit 2 to rotate.

[0030] Specifically, the moving groove 102 is a groove that extends from a certain point at the bottom of the shaft hole 101 of the connecting rod 1 to the end away from the bottom of the shaft hole 101, and extends all the way to the free end of the connecting post 103.

[0031] The arrangement of the moving block 203 and the two straightening rings 202 makes the insertion more convenient, and ensures both coaxiality and good torque.

[0032] In some embodiments, the moving block 203 is configured as at least one convex stop distributed along the outer contour of the connecting portion 201 of the central drill bit 2. A preferred embodiment further includes two moving blocks 203, which are two convex stops distributed at 180 degrees to each other along the outer contour of the connecting portion 201 of the central drill bit 2. Alternatively, a preferred embodiment further includes three moving blocks 203, which are three convex stops distributed at 120 degrees to each other along the outer contour of the connecting portion 201 of the central drill bit 2.

[0033] In some embodiments, the moving block 203 is located between two straightening rings 202. The straightening rings 202 ensure coaxiality, and the moving block 203 being located between the straightening rings 202 prevents coaxiality fluctuations caused by the force of the connecting rod 1 on the moving block 203.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A hole opener, comprising a connecting rod and a central drill bit; characterized in that, At least two centering rings are provided on the connecting part of the central drill bit, and the connecting rod is provided with a shaft hole to accommodate the connecting part of the central drill bit; the centering rings are inserted into the shaft hole with an interference fit to realize the connection between the central drill bit and the connecting rod.

2. The hole opener according to claim 1, characterized in that, The connecting part of the central drill bit is also provided with a moving block that provides torque. Correspondingly, the connecting rod is provided with a moving groove that matches the shape of the moving block. The moving block is inserted into the moving groove, so that the connecting rod drives the central drill bit to rotate.

3. The hole opener according to claim 2, characterized in that, The moving block is configured as at least one convex stop block distributed along the outer contour of the connection part of the central drill bit.

4. The hole opener according to claim 2, characterized in that, The moving block is configured as two blocks, which are two convex blocks distributed at 180 degrees on the outer contour of the connection part of the central drill bit.

5. The hole opener according to claim 2, characterized in that, The moving block is configured as three blocks, which are three convex blocks distributed at 120 degrees to each other on the outer contour of the connecting part of the central drill bit.

6. The hole opener according to claim 2, characterized in that, The moving block is located between the two straightening rings.

7. The hole opener according to claim 1, characterized in that, It also includes a core drill bit, which is detachably connected to the connecting rod.

8. The hole opener according to claim 7, characterized in that, After the coring drill bit is connected to the connecting rod, the center drill bit is located at the axis of the coring drill bit.

Images