A structure for rapid adjustment of the countersinking depth of a limiting countersinking drill.

Abstract

This utility model discloses a rapid adjustment structure for the countersinking depth of a limiting countersinking drill, including a drill body and a shank located at the tail of the drill body. A cap is externally threaded onto the outer side of the drill body, and a limiting rotating ring is engaged above the cap. An annular upper protrusion is located in the center of the inner hole of the cap, and its internal thread connects to the external thread of the drill body. The lower side of the annular upper protrusion forms an upper stop surface. An annular lower protrusion is located on the outer side below the drill body or on the outer side above the shank, and its upper side forms a lower stop surface. A locking spring is located between the upper and lower stop surfaces. The locking spring has a pre-compression amount, causing the cap to always tend to move upward relative to the drill body, thus achieving locking. This utility model's rapid adjustment structure for the countersinking depth of a limiting countersinking drill features fast adjustment speed and a simple and practical structure.

Description

Technical Field

[0001] This utility model relates to a limiting countersinking drill, specifically a structure for rapidly adjusting the countersinking depth of a limiting countersinking drill. Background Technology

[0002] Patent CN221064552U discloses a split-type combined countersink drill, specifically disclosing a drill body and a shank at its tail. A cap is threaded onto the outer side of the drill body, and a limiting rotating ring is engaged above the cap. In use, the axial height of the cap relative to the drill body is adjusted by rotating it, thereby synchronously adjusting the height of the limiting rotating ring relative to the drill body, ultimately achieving adjustment of the countersink depth.

[0003] To ensure effective locking after the cap is adjusted to the correct position, a screw locking structure or a split cap structure is used.

[0004] The screw-locking structure requires a special screwdriver to operate, and the entire adjustment process includes three steps: loosening the screw, adjusting the cap, and tightening the screw. This is cumbersome and inefficient.

[0005] The hat cover structure with two separate parts involves three steps in the adjustment process: rotating the lower hat cover to leave an adjustment gap, adjusting the upper hat cover with the limiting rotating ring to the desired position, and finally adjusting the lower hat cover to hold the upper hat cover together to achieve locking. This process is cumbersome and inefficient. Utility Model Content

[0006] To address the aforementioned problems, this utility model designs a rapid adjustment structure for the countersinking depth of a limiting countersinking drill, which features fast countersinking adjustment speed and a simple and practical structure.

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

[0008] A rapid adjustment structure for the countersinking depth of a limiting countersinking drill includes a drill body and a shank located at the tail of the drill body. A cap is externally threaded onto the outer side of the drill body, and a limiting rotating ring is engaged above the cap. The cap is characterized by: an annular upper protrusion in the center of its inner hole, with an internal thread connecting to the external thread of the drill body; the lower side of the annular upper protrusion forming an upper stop surface; an annular lower protrusion on the outer side below the drill body or above the shank, with its upper side forming a lower stop surface; and a locking spring between the upper and lower stop surfaces. The locking spring has a pre-compression amount, causing the cap to always tend to move upwards relative to the drill body, thus achieving locking.

[0009] More specifically, the outer surface of the aforementioned annular protrusion is provided with an adjustment scale.

[0010] More specifically, the outer side of the cap has at least one ratchet surface to facilitate finger grip.

[0011] More specifically, the drill body has a through-hole at its internal center, and a large-diameter section above the through-hole. A cutter head body is fitted in the large-diameter section with clearance. A cutter head is set on the top of the cutter head body. A central hole is provided in the center of the cutter head body. A central drill with its head protruding out is installed in the central hole. The tail of the central drill passes through the central hole and extends into the connecting hole of the lower section.

[0012] More specifically, the aforementioned central drill tail and cutter head are connected to the drill body via a common detachable fixing structure.

[0013] This invention features a rapid countersinking depth adjustment structure that utilizes the rotational restoring force of a locking spring to maintain a constant upward trend of the cap relative to the drill body. This causes the internal threads of the cap to abut against the external threads of the drill body, locking the cap in place. When adjustment is needed, the cap can be manually rotated to the desired position and released. Throughout the adjustment process, the restoring force of the locking spring remains constant, allowing for re-locking once the cap stops rotating.

[0014] In summary, the process of adjusting the countersunk hole depth simply involves rotating the cap to the desired position. The adjustment is quick and easy, effectively improving adjustment efficiency, and features a simple and practical structure. Attached Figure Description

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

[0016] Figure 2 A cross-sectional view of this utility model;

[0017] Figure 3 An exploded perspective view of this utility model;

[0018] Wherein, 1—drill body, 11—external thread, 12—connecting hole, 121—large diameter section, 2—handle, 3—cap, 31—annular upper protrusion, 311—internal thread, 312—upper stop surface, 32—rabbit tooth surface, 4—limiting rotating ring, 5—cutter head body, 51—cutter head, 52—center hole, 6—center drill, 7—annular lower protrusion, 71—lower stop surface, 72—adjustment scale, 8—locking spring. Detailed Implementation

[0019] like Figure 1-3 As shown, a rapid adjustment structure for the countersinking depth of a limiting countersinking drill includes a drill body 1 and a shank 2 located at the tail of the drill body. The outer side of the drill body 1 is provided with an external thread 11 connected to a cap 3, and a limiting rotating ring 4 is engaged and connected above the cap 3.

[0020] The drill body 1 has a through-hole 12 at its center. Above the through-hole 12 is a large-diameter section 121. A cutter head 5 is fitted into the large-diameter section 121 with clearance. A cutter head 51 is set on the top of the cutter head 5. A central hole 52 is provided in the center of the cutter head 5. A central drill 6 with its head protruding out is installed in the central hole 52. The tail of the central drill 6 passes through the central hole 52 and extends into the connecting hole 12 in the lower section. The tail of the central drill 6 and the cutter head 5 are connected to the drill body 1 by a common detachable fixing structure.

[0021] The cap 3 has an annular upper protrusion 31 in the middle of its inner hole. The upper protrusion 31 has an internal thread 311 that connects to the external thread 11 of the drill body 1. The lower side of the upper protrusion 31 forms an upper stop surface 312.

[0022] An annular lower protrusion 7 is provided on the outer side below the drill body 1 or on the outer side above the shank 2, and the upper side of the annular lower protrusion 7 forms a lower stop surface 71. This illustration adopts the latter structure, that is, the annular lower protrusion 7 is provided on the outer side above the shank 2, and to facilitate the setting of the annular lower protrusion 7, the upper end of the shank 2 is fitted onto the tail of the drill body 1. In practice, the annular lower protrusion 7 can also be directly provided on the outer side below the drill body 1. The technical effects produced by the two positions of the annular lower protrusion 7 are the same, and will not be described again here.

[0023] A locking spring 8 is provided between the upper stop surface 312 and the lower stop surface 7. The locking spring 8 has a pre-compression amount so that the cap 3 always tends to move upward relative to the drill body 1, thereby making the thread teeth on the two always abut against each other to achieve locking.

[0024] In summary, the countersinking depth quick adjustment structure designed in this utility model utilizes the pre-compression of the locking spring 8 to generate a rotational restoring force, thereby ensuring that the cap 3 maintains a constant upward trend relative to the drill body 1. This causes the internal thread 311 of the cap 3 and the external thread 11 of the drill body 1 to form an abutting lock, ultimately achieving position locking of the cap 3 relative to the drill body 1 when no adjustment is needed. When adjustment is required, the cap 3 can be manually rotated to the adjustment position and released. Throughout the adjustment process, the restoring force of the locking spring 8 remains constant, and once the cap 3 stops rotating, the abutting lock of the threads is achieved again.

[0025] In summary, the entire process of adjusting the depth of the counterbore hole only requires rotating the cap 3 to the required position on the drill body 1. The adjustment is simple and quick, effectively improving the adjustment efficiency, and has the characteristics of simple and practical structure.

[0026] Considering the effort-saving aspect of rotating the cap cover 3, the outer side of the cap cover 3 is provided with at least one ratchet surface 32 for easy finger support. This utility model describes the structure with two ratchet surfaces 32, and the two ratchet surfaces 32 are spaced apart on the upper and lower sides of the outer wall of the cap cover 3. In practice, one, three or more ratchet surfaces can be provided as needed, and the technical effect is similar, so it will not be described again here.

[0027] The outer surface of the annular lower protrusion 7 is provided with an adjustment scale 72, which provides direct observation for adjusting the cap 3, making the adjustment more convenient and intuitive.

[0028] 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. A rapid adjustment structure for the countersinking depth of a limiting countersinking drill, comprising a drill body (1) and a shank (2) disposed at the tail of the drill body (1), wherein an external thread (11) is provided on the outer side of the drill body (1) to connect a cap (3), and a limiting rotating ring (4) is engaged and connected above the cap (3), characterized in that: The cap (3) has an annular upper protrusion (31) in the middle of its inner hole. The annular upper protrusion (31) has an internal thread (311) that connects to the external thread (11) of the drill body (1). The lower side of the annular upper protrusion (31) forms an upper stop surface (312). The lower outer side of the drill body (1) or the upper outer side of the shank (2) has an annular lower protrusion (7). The upper side of the annular lower protrusion (7) forms a lower stop surface (71). A locking spring (8) is provided between the upper stop surface (312) and the lower stop surface (71). The locking spring (8) has a pre-compression amount so that the cap (3) always has an upward tendency relative to the drill body (1) to achieve locking.

2. The rapid adjustment structure for the countersinking depth of a limiting countersinking drill as described in claim 1, characterized in that: An adjustment scale (72) is provided on the outer surface of the annular lower protrusion (7).

3. The rapid adjustment structure for the countersinking depth of a limiting countersinking drill as described in claim 1, characterized in that: The outer side of the cap (3) is provided with at least one ratchet surface (32) to facilitate finger pressure.

4. The rapid adjustment structure for the countersinking depth of a limiting countersinking drill as described in any one of claims 1-3, characterized in that: The drill body (1) has a through-hole (12) at its center. Above the through-hole (12) is a large-diameter section (121). A cutter head body (5) is fitted in the large-diameter section (121) with clearance. A cutter head (51) is set on the top of the cutter head body (5). A central hole (52) is provided in the center of the cutter head body (5). A central drill (6) with its head protruding out is installed in the central hole (52). The tail of the central drill (6) passes through the central hole (52) and extends into the connecting hole (12) of the lower section.

5. The rapid adjustment structure for the countersinking depth of a limiting countersinking drill as described in claim 4, characterized in that: The tail of the central drill (6) and the cutter head (5) are connected to the drill body (1) through a common detachable fixing structure.

Images