Improved structure of limiting counter bore drill

Abstract

The utility model discloses an improved structure of a limiting counter bore drill, which comprises a drill body, a tool bit body and a center drill, the outer side of the drill body is sleeved with a cap sleeve, a quick adjusting structure is arranged between the lower portion of the cap sleeve and the drill body, the quick adjusting structure comprises an upper stop boss arranged on the drill body and a lower stop boss arranged at the bottom of the cap sleeve, and the lower stop boss is arranged on the lower portion of the cap sleeve. A reset spring is arranged between the two bosses, meanwhile, an adjusting hole arranged in an inclined mode is formed in one side wall of the cap sleeve, a row of stepped adjusting clamping grooves are formed in the upper side edge of the adjusting hole, an adjusting clamping column is arranged at the position, corresponding to the adjusting hole, of the drill body, and the outer end of the adjusting clamping column extends into the adjusting hole. And the reset spring has a pre-compression amount, so that the cap sleeve always has a downward moving trend, and the adjusting clamping column is tightly propped against a corresponding adjusting clamping groove. By means of the design, the positions of the plastic ring and the cap sleeve relative to the drill body can be rapidly adjusted, the problem that the plastic ring damages the surface of a plate in the hole opening process can be effectively solved, and the drill has the advantages of being simple in structure and practical.

Description

Technical Field

[0001] This utility model relates to a limiting countersinking drill, specifically an improved structure of a limiting countersinking drill. Background Technology

[0002] Patent 202322490033.6 discloses a split-type combined countersink drill, mainly comprising a drill body, a center drill, and a cap. The drill body has a through-hole at its center, with a large-diameter section above it. A cutter head is fitted into the large-diameter section with clearance fitting. An alloy cutter head is mounted on the top of the cutter head, and a central hole is located at its center. The tail of the center drill passes through this central hole and extends into the connecting hole of the lower section. A cap with chip removal holes is fitted onto the outside of the drill body. A gap is left between the top of the cap and the drill body to form a chip removal passage. The bottom of the cap is fixed to the drill body by a side screw or by a threaded connection. A built-in plastic ring is located at the top of the cap.

[0003] The distance between the plastic ring and the top of the drill bit body is the countersunk hole depth. In actual drilling, it is often necessary to adjust the countersunk hole depth. This requires adjusting the cap to fix the plastic ring relative to the drill body. However, in the above structure, the cap is fixed to the drill body by a side screw with a hexagonal hole. It cannot be operated by hand and must be done with a special wrench. This is very inconvenient and will affect the drilling efficiency to some extent.

[0004] In addition, the plastic rings are directly fixed to the top of the cap via a snap-fit ​​structure, and the two are fixedly connected. This causes the plastic rings to rotate synchronously with the cap when the hole is made. Although the plastic rings are made of a certain degree of elasticity, they still damage the surface of the board and seriously affect the quality of the hole making. Utility Model Content

[0005] To address the aforementioned issues, this invention presents an improved structure for a limiting countersink drill, which enables rapid adjustment of the relative positions of the plastic ring and the cap to the drill body, and effectively avoids damage to the plate surface caused by the plastic ring during drilling. It features a simple and practical structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An improved structure for a limiting countersinking drill includes a drill body and a cutter head and a center drill mounted on the drill body. A cap is fitted over the outer side of the drill body, and a plastic ring is provided on the top of the cap. The key feature is that a quick-adjustment structure is provided between the lower part of the cap and the drill body. This quick-adjustment structure includes an upper stop boss on the drill body and a lower stop boss at the bottom of the cap. A return spring is provided between the upper and lower stop bosses. Simultaneously, an obliquely arranged adjustment hole is provided on one side wall of the cap, and a row of stepped adjustment slots is provided on the upper side of the adjustment hole. An adjustment pin is provided on the drill body at a position corresponding to the adjustment hole, with the outer end of the adjustment pin extending into the adjustment hole. The return spring has a pre-compression amount, causing the cap to always tend to move downwards, thereby tightly holding the adjustment pin against a corresponding adjustment slot.

[0008] More specifically, the aforementioned plastic ring is fixed to the top of the cap by a bearing, and the entire plastic ring can rotate freely relative to the cap via the bearing.

[0009] More specifically, the top of the aforementioned plastic ring is equipped with a cushioning rubber ring.

[0010] More specifically, the outer wall of the cap is provided with ratchet grooves on the top or bottom, or both top and bottom.

[0011] More specifically, the plastic ring has chip removal holes around its perimeter.

[0012] More specifically, the aforementioned plastic ring has gaps between itself and the drill body and the cutter head to form a chip removal passage.

[0013] The countersink drill designed in this utility model has a quick adjustment structure between the cap and the drill body, which can quickly adjust the fixed position of the cap and plastic ring relative to the drill body, thereby adjusting the depth of the countersink. It has the characteristics of simple structure and practicality.

[0014] The plastic ring is fixed to the top of the cap by a bearing. When drilling, the plastic ring rotates synchronously with the cap when it is not in contact with the surface of the plate. When the plastic ring contacts the surface of the plate, it encounters resistance and remains stationary relative to the plate. This effectively avoids damage to the surface of the plate during the drilling process and can effectively improve the drilling quality of the countersunk drill. Attached Figure Description

[0015] Figure 1 A three-dimensional structural diagram of this utility model;

[0016] Figure 2 An exploded view of the three-dimensional structure of this utility model;

[0017] Figure 3 A cross-sectional view of this utility model;

[0018] Among them, 1—drill body, 2—cutter head body, 3—center drill, 4—cap, 41—ratchet groove, 5—plastic ring, 51—chip removal hole, 52—chip removal passage, 61—upper stop boss, 62—lower stop boss, 63—reset spring, 64—adjustment hole, 641—adjustment slot, 65—adjustment pin, 7—bearing, 8—buffer rubber ring. Detailed Implementation

[0019] like Figure 1-3 As shown, an improved structure of a limiting countersinking drill includes a drill body 1 and a cutter head body 2 and a center drill 3 disposed on the drill body.

[0020] The drill body 1 has a through-hole at its center. Above the through-hole is a large-diameter section. A cutter head 2 is fitted in the large-diameter section with clearance. An alloy cutter head is mounted on the top of the cutter head 2. The cutter head 2 has a central hole at its center. The tail of the central drill 3 passes through the central hole and extends into the lower section of the through-hole.

[0021] A cap 4 is fitted on the outside of the drill body 1. A plastic ring 5 is provided on the top of the cap 4. Chip removal holes 51 are provided around the periphery of the plastic ring 5. A gap is left between the plastic ring 5 and the drill body 1 and the cutter head body 2 to form a chip removal passage 52.

[0022] A quick-adjustment structure is provided between the lower part of the cap 4 and the drill body 1. This quick-adjustment structure includes an upper stop boss 61 and a lower stop boss 62. The upper stop boss 61 is located on the drill body 1, and the lower stop boss 62 is located at the bottom of the cap 4. A return spring 63 is provided between the upper and lower stop bosses. Simultaneously, a long, obliquely arranged adjustment hole 64 is provided on one side wall of the cap 4. A row of stepped adjustment slots 641 is provided on the upper side of the adjustment hole 64. The drill body 1 has an adjustment pin 65 at the position corresponding to the adjustment hole 64, with the outer end of the adjustment pin 65 extending into the adjustment hole 64. The return spring 63 has a pre-compression amount, causing the cap 4 to always tend to move downwards relative to the drill body 1, thereby ensuring that the adjustment pin 65 is tightly held in a corresponding adjustment slot 641.

[0023] When it is necessary to adjust the countersinking depth, simply grasp the cap 4 and move it upward relative to the drill body 1 to further compress the return spring 63, so that the adjusting pin 65 comes out of the adjusting slot 641. Then rotate the cap 4 to the position of the adjusting slot 641 that needs to be adjusted and release it. At this time, the cap 4 will move downward under the action of the return spring 63, so that the adjusting pin 65 is inserted into the corresponding adjusting slot 641, thus completing one countersinking depth adjustment operation. The entire operation does not require special tools and can be done by hand, which has the characteristics of quick and convenient operation.

[0024] To facilitate finger pressure during adjustment, the outer wall of the cap 4 is provided with ratchet grooves 41 on the upper or lower surface, or both, to effectively increase the frictional resistance between the cap 4 and the fingers during operation and improve ease of operation. This illustration only describes the structure with ratchet grooves 41 on both the upper and lower surfaces of the outer wall of the cap 4. In practice, ratchet grooves 41 can be provided only on the upper or lower surface as needed.

[0025] Furthermore, to address the issue of frictional damage to the sheet metal surface caused by the plastic ring 5 during drilling, the plastic ring 5 of this invention is fixed to the top of the cap 4 via a bearing 7, allowing the entire plastic ring 5 to rotate freely relative to the cap 4. During drilling, when the plastic ring 5 is not in contact with the sheet metal surface, it will rotate synchronously with the cap 4. However, when the plastic ring 5 contacts the sheet metal surface, it will encounter significant resistance. Under this resistance, the plastic ring 5 will rotate in the opposite direction relative to the cap 4 via the bearing 7, remaining stationary relative to the sheet metal. This effectively prevents damage to the sheet metal surface during drilling and improves the processing quality of the drilling.

[0026] The top of the plastic ring 5 is provided with a buffer rubber ring 8, which can play a good buffering role when the plastic ring 5 just contacts the surface of the plate, and can further protect the surface of the plate.

[0027] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the utility model. Any simple modifications, equivalent changes, or alterations made to the above embodiments based on the technical principles of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. An improved structure of a limiting countersinking drill, comprising a drill body (1) and a cutter head body (2) and a center drill (3) disposed on the drill body, wherein a cap (4) is fitted on the outer side of the drill body (1), and a plastic ring (5) is provided on the top of the cap (4), characterized in that: A quick adjustment structure is provided between the lower part of the cap (4) and the drill body (1). The quick adjustment structure includes an upper stop boss (61) on the drill body (1) and a lower stop boss (62) at the bottom of the cap (4). A return spring (63) is provided between the upper stop boss (61) and the lower stop boss (62). At the same time, an adjustment hole (64) with an oblique layout is provided on one side wall of the cap (4). A row of stepped adjustment slots (641) is provided on the upper side of the adjustment hole (64). At the same time, an adjustment pin (65) is provided on the drill body (1) at the position corresponding to the adjustment hole (64). The outer end of the adjustment pin (65) extends into the adjustment hole (64). The return spring (63) has a pre-compression amount so that the cap (4) always has a downward tendency, thereby making the adjustment pin (65) tightly pressed against a corresponding adjustment slot (641).

2. The improved structure of the limiting countersink drill as described in claim 1, characterized in that: The plastic ring (5) is fixed to the top of the cap (4) by a bearing (7), and the entire plastic ring (5) can rotate freely relative to the cap (4) by the bearing (7).

3. An improved structure for a limiting countersink drill as described in claim 1 or 2, characterized in that: The top of the plastic ring (5) is provided with a buffer rubber ring (8).

4. An improved structure for a limiting countersink drill as described in claim 1 or 2, characterized in that: The cap (4) has a ratchet groove (41) on the upper or lower part of its outer wall, or both above and below.

5. An improved structure for a limiting countersink drill as described in claim 1 or 2, characterized in that: The plastic ring (5) is provided with chip removal holes (51) around its periphery.

6. The improved structure of a limiting countersink drill as described in claim 5, characterized in that: The plastic ring (5) has a gap between itself and the drill body (1) and the cutter head body (2) to form a chip removal passage (52).

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