Drill chuck and front end cap

Abstract

The utility model provides a drill chuck and a front end cap, the front end cap comprises an inner cylinder, an outer cylinder and a front connecting part, the inner cylinder is provided with a rear end, and the front end of the inner cylinder and the outer cylinder form a continuous whole through the front end connecting part; a protruding ring protruding out of the inner cylinder or a plurality of protruding keys arranged in the circumferential direction are arranged in front of the rear end of the inner cylinder. The front end cap is provided with the convex ring or the convex key formed in front of the rear end of the inner cylinder, the inner diameter of the convex ring or the convex key is standard, the end face of the convex ring or the convex key is flat, part cost is low, positioning force is large, the axial position of the convex ring or the convex key is more accurate, positioning of the rotating sleeve is more accurate, and the convex ring or the convex key is located in front of the bottom end of the inner cylinder and bears small torque. And the connection with the annular clamping groove on the drill body is more reliable, and the service life is longer.

Description

Technical Field

[0001] The utility model relates to a drill chuck, in particular to a hand-tight drill chuck. Background Art

[0002] The drill chuck consists of a drill body, jaws, a nut, and a rotating sleeve. The nut and jaws are threaded together, and the rotating sleeve is connected to the nut. A step in the middle of the drill body supports the rear of the nut. Manually operating the rotating sleeve and rotating the nut drives the jaws forward or backward, tightening or loosening the drill bit. A front cap is also located at the front end of the drill chuck. This cap is connected to the front end of the drill body to limit the position of the rotating sleeve at the front end and also serves as a decorative feature.

[0003] The front end cap comprises an inner tube and an outer conical sleeve. A hook bent toward the axis of the drill body is disposed at the rear end of the inner tube. The front end cap is connected to the front end of the drill body through an interference fit within the inner tube, and the hook engages with a groove at the front end of the drill body. This structure of the front end cap is relatively complex to manufacture, requiring two stamping steps. However, it is difficult to ensure that the flatness of the bent portion and the inner diameter of the hook meet the requirements. The latter issue leads to unpredictability in the connection between the hook and the groove. Therefore, an additional lathe step is required to standardize the inner diameter. This significantly reduces manufacturing efficiency and increases costs. Even so, the flatness of the bent portion still affects the accuracy of the axial position of the front end cap, which in turn affects the accuracy of the position of the rotating sleeve, while also adversely affecting the positioning force. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a drill chuck and a front end cap, which can improve the front end cap to at least partially solve the problems described in the background technology.

[0005] To this end, according to the first aspect of the present invention, the present invention adopts the following technical solutions:

[0006] A front end cap comprises an inner tube, an outer tube and a front connecting portion, wherein the inner tube has a rear end, and the front end of the inner tube forms a continuous whole with the outer tube through the front connecting portion; the characteristic is that the inner tube is provided with a convex ring protruding from the inner tube or a plurality of convex keys arranged along the circumferential direction in front of the rear end.

[0007] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions or use these further technical solutions in combination.

[0008] The convex ring or convex key is provided at the front end of the inner cylinder.

[0009] The inner cylinder has an annular platform at the front end which is continuous with the convex ring or convex key. The wall thickness of the front end cap connected with the front end of the annular platform is slightly thinner than the wall thickness of the inner cylinder behind the convex ring or convex key.

[0010] The convex ring or convex key is a protruding structure formed by cold extruding the front end cap stamping body composed of the inner tube, the outer tube and the front connecting part and continuing to form the inner wall material of the inner tube.

[0011] To this end, according to the second aspect of the present invention, the present invention adopts the following technical solutions:

[0012] A drill chuck includes a drill body and an annular groove is provided at the front of the drill body. It is characterized in that the drill chuck is also provided with the aforementioned front end cap, the inner cylinder is sleeved on the front end of the drill body and is connected to the front end of the drill body through an interference fit, and the convex ring or convex key is engaged with the annular groove.

[0013] Furthermore, the drill chuck is provided with a rotating sleeve, the rotating sleeve is sleeved outside the drill body, and the front end cap axially limits the front end of the rotating sleeve.

[0014] Furthermore, the outer cylinder of the front end cap is generally conical and surrounds the outer side of the front end of the rotating sleeve.

[0015] Due to the adoption of the technical solution of the utility model, the front end cap of the utility model has a convex ring or convex key formed in front of the rear end of the inner cylinder. The inner diameter of the convex ring or convex key is standard and the end face is flat. The cost of the parts is low and the positioning force is large. The axial position of the convex ring or convex key is more accurate, which makes the positioning of the rotating sleeve more accurate. The convex ring or convex key is located in front of the bottom end of the inner cylinder, and is subjected to small torque. The connection with the annular groove on the drill body is more reliable and has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of an embodiment of the present utility model.

[0017] Figure 2 This is an exploded view of an embodiment of the present utility model.

[0018] Figure 3 This is a cross-sectional view of the front end cap according to an embodiment of the present invention.

[0019] Figure 4 for Figure 3 A three-dimensional schematic diagram of the front end cap.

[0020] Figure 5 Schematic diagram of a drill body according to an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of another embodiment of the front end cap of the present invention. DETAILED DESCRIPTION

[0022] Refer to the accompanying drawings. The front end cap 3 provided by the present invention comprises an inner tube 31, an outer tube 32, and a front end connecting portion 33. The inner tube 31 has a rear end 311, and the front end of the inner tube 31 forms a continuous whole with the outer tube 32 through the front end connecting portion 33. The rear end of the inner tube 31 does not have a bent hook portion for engaging with the annular groove at the front end of the drill chuck drill body, but a convex ring 312 protruding from the inner tube is provided in front of the rear end (see FIG. Figure 2 、 3 ) or multiple circumferentially arranged convex keys 313 (see Figure 6 , having a plurality of convex keys 313 arranged along the circumferential direction), the convex ring 312 or the convex key 313 is used to cooperate with the annular groove at the front end of the drill body of the drill chuck.

[0023] Preferably, the protruding ring 312 or key 313 is provided at the front end of the inner cylinder 1. This not only ensures a more reliable connection with the annular groove of the drill body, extending its service life, but also facilitates installation. The inner cylinder 31 has an annular platform 314 at its front end, which is continuous and integral with the protruding ring or key. The front end cap 315, which connects to the front end of the annular platform 314, has a wall thickness slightly thinner than the inner cylinder wall behind the protruding ring or key. This not only facilitates the mating of the protruding ring 312 or ridge 313 with the annular groove, but also facilitates press-fit assembly of the front end cap 32 from the front end of the drill body.

[0024] The protruding ring 312 or key 313 is formed by stamping the front end cap (made from sheet metal) within a die. This is then cold-extruded within the die by transferring metal material onto the inner side of the inner tube, creating a continuous protrusion with the inner tube material. This structure eliminates the need for lathe processing. The various cross-sectional shapes of the protruding ring 312 or key 313 can be easily achieved using the die.

[0025] The structure of the present invention can be applied to drill chucks without self-locking function, and can also be applied to drill chucks with self-locking function. The drill chuck of this embodiment is a drill chuck with self-locking function.

[0026] Regardless of whether or not it has a self-locking function, the drill chuck includes a drill body 1, the front end of which is provided with the aforementioned annular retaining groove 10, and the drill chuck is provided with the aforementioned front cap 3. The inner cylinder 31 is sleeved over the front end of the drill body 1. The inner cylinder 31 and the front end of the drill body 1 are connected by an interference fit, and the raised ring 312 or the raised key 313 engages with the annular retaining groove 10. The drill chuck also includes a rotating sleeve 2, which is sleeved over the drill body 1. The front cap 3 axially limits the front end of the rotating sleeve 2. The outer cylinder 32 of the front cap 3 is generally conical and surrounds the outer front end of the rotating sleeve 2.

[0027] In the accompanying drawings, reference numeral 4 is a clamping claw, reference numeral 5 is a nut, and the nut 4 is driven to rotate by the rotating sleeve 2 .

[0028] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the field of the present invention are included in the protection scope of the present invention.

Claims

1. A front end cap, comprising an inner tube, an outer tube, and a front connecting portion, wherein the inner tube has a rear end, and the front end of the inner tube forms a continuous whole with the outer tube through the front connecting portion; The inner cylinder is provided with a convex ring protruding from the inner cylinder or a plurality of convex keys arranged along the circumferential direction in front of the rear end.

2. A front end cap as claimed in claim 1, characterized in that The convex ring or convex key is provided at the front end of the inner cylinder.

3. A front end cap as claimed in claim 1, characterized in that The inner cylinder has an annular platform at the front end which is continuous with the convex ring or convex key. The wall thickness of the front end cap connected with the front end of the annular platform is slightly thinner than the wall thickness of the inner cylinder behind the convex ring or convex key.

4. A front end cap according to claim 1 or 2, characterized in that The convex ring or convex key is a protruding structure formed by cold extruding the front end cap stamping body composed of the inner tube, the outer tube and the front connecting part and continuing to form the inner wall material of the inner tube.

5. A drill chuck comprising a drill body, a front portion of which is provided with an annular groove, characterized in that The drill chuck is further provided with a front end cap as claimed in claim 1, 2, 3 or 4, the inner tube is sleeved on the front end of the drill body and is connected to the front end of the drill body by interference fit, and the convex ring or convex key is clamped with the annular groove.

6. A drill chuck according to claim 5, characterized in that The drill chuck is provided with a rotating sleeve, which is sleeved outside the drill body, and the front end cap axially limits the front end of the rotating sleeve.

7. A drill chuck according to claim 6, characterized in that The outer cylinder of the front end cap is generally conical and surrounds the outer side of the front end of the rotating sleeve.

Images