Split type counterbore drill

Abstract

The utility model discloses a split type counterbore drill, its technical scheme main points include connecting handle, main drill rod and center drill, the front end of connecting handle is provided with the connecting cavity, the main drill rod inserts the connecting cavity, the main drill rod and connecting handle hollowly are set to make the center drill pass through connecting handle and main drill rod and stretch out from the front end of main drill rod, the connecting cavity, main drill rod and center drill are provided with the top silk device fixed connection between three, be provided with the screw portion on the main drill rod, be provided with the adjusting seat on the screw portion, the front end of adjusting seat rotatoryly is equipped with the positioning sleeve, and the back end of adjusting seat is equipped with the spring between connecting cavity front end surface. The utility model discloses split type connecting handle and main drill rod, and the cost of different specifications main drill rod is lower, and the adjusting seat of convenient height adjustment is set simultaneously, and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, and more specifically to a split-type countersink drill. Background Technology

[0002] Countersinking is an important part of hole machining today, generally used in woodworking. Countersinking drill bits are used to create countersinks, which allow the screw head to be embedded internally without protruding, thus preserving the appearance of the part and maintaining a smooth surface. Currently available countersinking drill bits, such as the novel countersinking drill disclosed in CN220278368U, mainly include a center drill for forming the inner hole and a body for forming the outer hole. The body is connected to a bench drill, electric drill, etc., to drive the drill bit to rotate.

[0003] However, the above-mentioned existing technology still has some defects. First, the part of the main body that connects to the bench drill or electric drill and the cutting edge are set as one piece. When changing the cutting edge of different specifications, the entire main body needs to be replaced. A set of products usually has multiple main bodies, which requires high costs. Second, the height of the positioning ring and the main body is inconvenient to adjust. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a split-type countersinking drill, which uses a split connecting shank and main drill rod. The main drill rods of different specifications have lower costs, and an adjustment seat is provided for easy height adjustment, making it convenient to use.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a split-type countersink drill, comprising a connecting shank, a main drill rod, and a center drill. The front end of the connecting shank is provided with a connecting cavity, and the main drill rod is inserted into the connecting cavity. The main drill rod and the connecting shank are hollow, so that the center drill passes through the connecting shank and the main drill rod and extends out from the front end of the main drill rod. The connecting cavity, the main drill rod, and the center drill are fixedly connected by a set screw device. The main drill rod is provided with a threaded portion, and an adjusting seat is threadedly connected to the threaded portion. The front end of the adjusting seat is rotatably provided with a positioning sleeve, and a spring is provided between the rear end of the adjusting seat and the front end face of the connecting cavity.

[0006] The present invention is further configured such that: an adjusting nut is threadedly connected to the threaded portion, and the spring is disposed between the adjusting seat and the adjusting nut.

[0007] The present invention is further configured such that: the set screw device includes a first set screw hole, a second set screw hole and a set screw, the first set screw hole and the second set screw hole are respectively disposed on the side wall of the connecting cavity and the main drill rod, and the two are connected, and the set screw is screwed into the first set screw hole and the second set screw hole and abuts against the center drill.

[0008] The present invention is further configured such that: the front end of the main drill rod is provided with a cutting edge, and a chip removal groove for connecting the cutting edge is extended on the main drill rod.

[0009] The present invention is further configured such that the portion of the rear end of the central drill that is adapted to the set screw device has a planar section.

[0010] The present invention is further configured such that: the main drill rod is provided with a scale surface along the axial direction, and scale indicator lines are provided on the scale surface.

[0011] The present invention is further configured such that: the adjusting seat is provided with an axially protruding ring platform, the ring platform is provided with a bearing, and the positioning sleeve is provided on the bearing.

[0012] The present invention is further configured such that the side wall of the positioning sleeve is provided with a plurality of chip removal notches.

[0013] The present invention is further configured such that: the rear end of the connecting handle is provided with a driving surface adapted to and connected to an external power device.

[0014] In summary, this utility model has the following beneficial effects:

[0015] Compared with the prior art, this utility model features a separate connecting handle and main drill rod. The connecting handle is connected to an external power unit, thus requiring less length and material for the main drill rod. Consequently, a single product can have multiple main drill rods of different specifications, requiring even less material. Compared with the prior art, the cost is effectively controlled.

[0016] This invention features a threaded section on the main drill rod. The depth of the counterbore can be adjusted by axial adjustment of the threaded section and the adjusting seat. The main drill rod also has a scale surface, which allows for intuitive understanding of the counterbore depth during adjustment, making the adjustment convenient and quick.

[0017] This utility model is designed with a spring to provide a clamping force to the adjusting seat in the axial direction, which increases the frictional resistance of the threaded connection between the adjusting seat and the threaded part. This makes it less likely for the adjusting seat to deviate axially in the threaded part due to mechanical vibration during normal processing, thus ensuring the accuracy of the countersunk hole depth. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure and exploded structure of Example 1.

[0019] Figure 2 This is a schematic diagram of the overall structure and exploded structure of Example 2.

[0020] Figure 3 This is a schematic diagram of the main drill pipe structure.

[0021] Figure 4 This is a schematic diagram of the center drill structure.

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of Example 2.

[0023] Reference numerals: 1. Connecting shank; 11. Connecting cavity; 2. Main drill rod; 21. Threaded part; 22. Cutting edge; 3. Center drill; 31. Planar section; 4. Set screw device; 41. First set screw hole; 42. Second set screw hole; 43. Set screw; 5. Adjusting seat; 51. Positioning sleeve; 511. Chip removal notch; 52. Ring platform; 53. Bearing; 6. Spring; 7. Adjusting nut; 8. Chip removal groove; 9. Scale surface; 10. Drive surface. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] This embodiment discloses a split-type countersink drill, such as Figure 1-5 As shown, the system includes a connecting shank 1, a main drill rod 2, and a center drill 3. The connecting shank 1 and the main drill rod 2 are designed as separate components. For different countersinking specifications, only the main drill rod 2 of different specifications needs to be replaced, without replacing the connecting shank 1. Compared to the existing technology with a one-piece design, the separate main drill rod 2 requires less material, reducing cost adaptability and allowing for better cost control. Specifically, refer to... Figure 1-2 The connecting handle 1 has a connecting cavity 11 at its front end, and the main drill rod 2 is inserted into the connecting cavity 11, thereby realizing the separation and connection of the connecting handle 1 and the main drill rod 2. The main drill rod 2 and the connecting handle 1 are hollow, so that the center drill 3 passes through the connecting handle 1 and the main drill rod 2 and extends from the front end of the main drill rod 2. The connecting cavity 11, the main drill rod 2 and the center drill 3 are fixedly connected by a set screw device 4. Countersunk drills are generally used for woodworking, so the set screw device 4 made of high-strength metal can realize the stable connection of the three and ensure that the three rotate synchronously when drilling.

[0026] Meanwhile, the main drill rod 2 is provided with a threaded part 21, and an adjusting seat 5 is threadedly connected to the threaded part 21. The front end of the adjusting seat 5 is rotatably provided with a positioning sleeve 51. Through the above structure, the threaded part 21 and the adjusting seat 5 are rotated by threaded engagement to achieve rapid adjustment of the counterbore depth. The rotating positioning sleeve 51 will stop when it touches the workpiece surface. The rotation of the main drill rod 2 will not affect the positioning sleeve 51, thereby ensuring that the positioning sleeve 51 will not wear the workpiece surface.

[0027] Reference Figure 1This is an embodiment of the spring 6 setting method in this scheme. A spring 6 is provided between the rear end of the adjusting seat 5 and the front end face of the connecting cavity 11. The function of the spring 6 is to provide an axial pressure on the adjusting seat 5, so that the threaded engagement between the adjusting seat 5 and the threaded part 21 is stable and the position between the adjusting seat 5 and the threaded part 21 will not be deviated due to mechanical vibration during drilling, etc., thus ensuring the stability of the counterbore depth.

[0028] Furthermore, refer to Figure 2 This is Embodiment 2 of the spring 6 arrangement in this scheme. An adjusting nut 7 is threadedly connected to the threaded portion 21, and the spring 6 is disposed between the adjusting seat 5 and the adjusting nut 7. With the above structure, the adjusting nut 7 can be movably adjusted relative to the front end face of the connecting cavity 11. Therefore, the adjusting nut 7 can be rotated to move closer to the adjusting seat 5, thereby increasing the elastic force of the spring 6, making the axial pressure exerted by the spring 6 on the adjusting seat 5 greater, and the friction between the adjusting seat 5 and the threads on the threaded portion 21 greater, resulting in better stability.

[0029] Furthermore, friction textures are provided on the outer surface of the adjusting seat 5 to allow for a better grip. In use, simply grip the adjusting seat 5 and then use a hand drill to rotate the main drill rod 2. Depending on the rotation direction of the main drill rod 2, the adjusting seat 5 can be adjusted axially up and down. After releasing the grip, the adjusting seat 5 rotates synchronously with the main drill rod 2 due to the spring force of the spring 6. Correspondingly, friction textures are also provided on the adjusting nut 7, and the adjustment method is the same as that of the adjusting seat.

[0030] Furthermore, the set screw device 4 specifically includes a first set screw hole 41, a second set screw hole 42, and a set screw 43. The first set screw hole 41 and the second set screw hole 42 are respectively located on the side walls of the connecting cavity 11 and the main drill rod 2, and the two are connected. The set screw 43 is screwed into the first set screw hole 41 and the second set screw hole 42 and abuts against the center drill 3. With the above structure, when in use, align the first set screw hole 41 and the second set screw hole 42, and then screw in the set screw 43 and abut it against the center drill 3 to achieve a stable connection between the connecting shank 1, the main drill rod 2, and the center drill 3. When it is necessary to replace the center drill 3 or the main drill rod 2, simply unscrew the set screw 43. The structure is simple and convenient.

[0031] Furthermore, the front end of the main drill rod 2 is provided with a cutting edge 22, which is used to form a countersunk hole. A chip removal groove 8 is extended on the main drill rod 2 to connect with the cutting edge 22. The chip removal groove 8 is used to assist in chip removal.

[0032] Furthermore, refer to Figure 4 To ensure a stable connection of the center drill 3, a flat section 31 is provided at the rear end of the center drill 3 to fit the set screw device 4. The flat section 31 abuts against the set screw 43 to improve torque transmission.

[0033] Furthermore, to facilitate the adjustment of the countersunk hole depth, refer to... Figure 1-3 The main drill rod 2 has a graduated surface 9 along the axial direction, and graduated indicator lines are set on the graduated surface 9. Specifically, when the bottom edge of the adjusting seat 5 is aligned with the starting line of the graduated indicator line on the graduated surface 9, the front end face of the positioning sleeve 51 is also aligned with the cutting edge 22. In this way, the depth of the countersinking hole is exactly the same as the depth of the bottom edge of the adjusting seat 5 corresponding to the graduated indicator line, which is convenient for the operator to adjust the depth of the countersinking hole.

[0034] Furthermore, an axially protruding annular platform 52 is provided on the adjusting seat 5, and a bearing 53 is provided on the annular platform 52. The positioning sleeve 51 is mounted on the bearing 53. Specifically, the positioning sleeve 51 can rotate freely through the annular platform 52 and the bearing 53. At the same time, several chip removal notches 511 are provided on the side wall of the positioning sleeve 51. Since the positioning sleeve 51 will approach and press against the surface of the workpiece, the chip removal notches 511 facilitate the discharge of wood chips and other materials from the side.

[0035] Furthermore, the rear end of the connecting handle 1 is provided with a drive surface 10 adapted to connect with an external power device. Preferably, the drive surface 10 is configured as a hexagonal structure for connecting with a handheld electric drill to transmit power.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A split-type countersink drill, comprising a connecting shank (1), a main drill rod (2), and a center drill (3), characterized in that: The front end of the connecting handle (1) is provided with a connecting cavity (11), the main drill rod (2) is inserted into the connecting cavity (11), the main drill rod (2) and the connecting handle (1) are hollow, so that the center drill (3) passes through the connecting handle (1) and the main drill rod (2) and extends out from the front end of the main drill rod (2), the connecting cavity (11), the main drill rod (2) and the center drill (3) are fixedly connected by a set screw device (4); the main drill rod (2) is provided with a threaded part (21), the threaded part (21) is threadedly connected to an adjusting seat (5), the front end of the adjusting seat (5) is provided with a positioning sleeve (51), and a spring (6) is provided between the rear end of the adjusting seat (5) and the front end face of the connecting cavity (11).

2. A split-type countersink drill according to claim 1, characterized in that: An adjusting nut (7) is threaded onto the threaded part (21), and the spring (6) is disposed between the adjusting seat (5) and the adjusting nut (7).

3. A split-type countersink drill according to claim 1, characterized in that: The set screw device (4) includes a first set screw hole (41), a second set screw hole (42) and a set screw (43). The first set screw hole (41) and the second set screw hole (42) are respectively provided on the side wall of the connecting cavity (11) and the main drill rod (2), and the two are connected. The set screw (43) is screwed into the first set screw hole (41) and the second set screw hole (42) and abuts against the center drill (3).

4. A split-type countersink drill according to claim 1, characterized in that: The front end of the main drill rod (2) is provided with a cutting edge (22), and a chip removal groove (8) connecting the cutting edge (22) is extended on the main drill rod (2).

5. A split-type countersink drill according to claim 1, characterized in that: The rear end of the center drill (3) is fitted with a planar section (31) for the part that is adapted to the set screw device (4).

6. A split-type countersink drill according to claim 1, characterized in that: The main drill pipe (2) is provided with a scale surface (9) along the axial direction, and scale indicator lines are provided on the scale surface (9).

7. A split-type countersink drill according to claim 1, characterized in that: The adjusting seat (5) is provided with an axially protruding ring platform (52), the ring platform (52) is provided with a bearing (53), and the positioning sleeve (51) is provided on the bearing (53).

8. A split-type countersink drill according to claim 1, characterized in that: The positioning sleeve (51) has several chip removal notches (511) on its side wall.

9. A split-type countersink drill according to claim 1, characterized in that: The rear end of the connecting handle (1) is provided with a drive surface (10) that is adapted to connect with an external power device.

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