WO2013071846A1

WO2013071846A1 - Antilock self-tightening drill chuck

Info

Publication number: WO2013071846A1
Application number: PCT/CN2012/084447
Authority: WO
Inventors: 周文华; 赵强
Original assignee: 浙江三鸥机械股份有限公司
Priority date: 2011-11-18
Filing date: 2012-11-12
Publication date: 2013-05-23
Also published as: CN202387977U

Abstract

An antilock self-tightening drill chuck comprising a connector body (1) matingly connected to a driving machine, a jaw-guiding frame (6) that is coaxial with the connector body (1) and is capable of rotating relatively to the connector body, a jaw (8), and a threaded rod (7) connected to a thread of a threaded hole (12) in the connector body. The jaw (8) is slidably connected to a guiding groove (61) on the jaw-guiding frame (6). The jaw (8) is also slidably connected to a guiding mount groove (72) at the front portion of the threaded rod (7). An external thread on the threaded rod (7) is a left-handed thread. The threaded rod (7) is provided at the rear end thereof with a hole (73) extending forward, thus the threaded rod (7) where the hole (73) is provided is cylindrical in shape. The tubular threaded rod (7) is provided on a tube wall thereof with multiple grooves (71) running through the tube wall and extending forward from the rear end of the threaded rod. When the force of the self-tightening drill chuck clamping a drill and the force of an internal thread of the connector body (1) matching the external thread of the threaded rod (7) increase, a slight deformation is generated at a portion of the threaded rod where the grooves (71) are, allowing the threaded rod to change from the original cylindrical shape to a rearwardly tapered cone, this reduces contact surface and reduces friction, thus allowing for antilock, and for facilitating an operation in which the self-tightening drill chick releases the drill.

Description

Description: An anti-lock self-tightening drill chuck

The utility model relates to a self-tightening drill chuck. Background technique

In the prior art, the self-tightening chuck is provided with a connecting body that is coupled with the driving machine, a jaw guide frame that is coaxial with the connecting body and rotatable relative to the connecting body, a clamping jaw, and a threaded hole of the center thread of the connecting body. The connected screw, the jaw is slidably coupled to the guide mounting groove at the front of the screw. In use, the drill chuck is operated to rotate the jaw guide frame and the connecting body relative to each other, and the movement of the screw drives the jaws to advance and retreat on the guiding groove on the guiding frame, thereby clamping and releasing the drilling tool. Since the screw thread of the self-tightening chuck is a left-hand thread, in actual use, in the case of a large load, the clamped tool will be more tightly clamped, resulting in a locking phenomenon, resulting in a self-tightening drill string. The operation of the head release tool is laborious or unsettled. Summary of the invention

The technical problem to be solved by the utility model is to provide an anti-locking self-tightening drill chuck, which does not affect the self-tightening function of the self-tightening drill chuck, and at the same time makes the operation of the self-tightening drill chuck releasing tool relatively easy. . To this end, the utility model adopts the following technical solutions: it comprises a connecting body that is coupled with the driving machine, a jaw guiding frame coaxial with the connecting body and rotatable relative to the connecting body, a clamping jaw, and a threaded hole in the connecting body a threaded screw, the jaw is slidably coupled to a guide groove on the jaw guide frame, and the jaw is slidably coupled to the guide mounting groove at the front of the screw, the external thread on the screw is a left-hand thread, and the screw is rearward The end extends forwardly with a hole in which the screw in which the hole is located is tubular, and the wall of the tubular screw is provided with a plurality of grooves extending through the tube wall and extending forward from the rear end of the screw. Based on the above technical solution of the present invention, the present invention can simultaneously adopt the following further technical solutions:

It has one or more of the slots.

It has a plurality of said grooves which are evenly distributed along the circumference of the tube, the depths of said plurality of grooves being uniform.

The groove extends forward from the rear end in the axial direction of the screw.

The bottom of the groove has a hole shape having a diameter larger than the groove width.

The guiding mounting groove is a inclined groove inclined to the screw axis, the inner end of which is at the front and the outer end is at the rear, and the clamping jaw is provided with an inclined sliding block which is installed in the guiding mounting groove and is slidably engaged with the sliding guide.

Due to the technical solution of the utility model, the utility model still has the self-tightening function in the work. When the self-tightening drill chuck clamps the drilling tool in use, the self-tightening drill due to the continuous change of the load and the inertia The force of the chuck holding the drill is increasing. In the utility model, when the force of the self-tightening chuck clamping the drilling tool is getting larger and larger, the internal thread of the connecting body and the external thread of the screw are more and more matched, the threading of the connecting body and the screw is matched. It seems that a taper hole is matched with a tapered shaft, thereby generating a radial force toward the center of the circle. Since the screw is provided with a groove, the thread of the screw is divided into several parts, as if a plurality of sheets form a circle. It has the possibility of moving toward the center. As the force increases, the screw portion where the groove is located is slightly deformed toward the center, and the original cylindrical shape becomes a tapered cone which is backward, so that the rear thread The contact surface is smaller than normal, and the contact surface is small, and the friction between them is small, so that the operation of loosening the drill by the self-tightening chuck is facilitated. DRAWINGS

Figure 1 is a schematic view showing the outline of the embodiment 1 of the present invention.

Fig. 2 is a cross-sectional view taken along line A-A of Fig. 1 showing the main internal structure of the drill chuck.

Figure 3 is an exploded view of the embodiment 1 of the present invention showing the mounting sequence of the components of the drill chuck and the appearance of the components. Fig. 4a is a three-dimensional perspective view of the screw of the first embodiment of the present invention.

Figure 4b is a front view of the screw of the embodiment 1 of the present invention

Figure 4c is a cross-sectional view taken along line & B of Figure 4b.

Figure 5 is a half cross-sectional view of the embodiment 2 of the present invention showing the main internal structure of the drill chuck and the outer shape of the drill chuck.

Figure 6 is an exploded view of the embodiment 2 of the present invention showing the mounting sequence of the components of the drill chuck and the shape of the components.

Figure 7 is a three-dimensional perspective view of the screw of the embodiment 2 of the present invention. detailed description

Embodiment 1 Referring to Figures 1, 2, 3, 4a, 4b, 4c.

The utility model comprises a connecting body 1 which is coupled with a driving machine, a jaw guiding frame 6 coaxial with the connecting body and rotatable relative to the connecting body, a clamping jaw 8, and a screw thread 7 which is screwed with the threaded hole 12 in the connecting body. The clamping jaws 8 are slidably connected to the guiding grooves 61 on the jaw guiding frame 6. The rotating jaws 8 drive the clamping jaws 8 to advance and retreat on the guiding grooves 61. The clamping jaws 8 can also be slidably connected to the front of the screw for guiding installation. On the groove 72, the external thread on the screw is a left-handed thread, and the sliding of the jaw 8 along the guiding groove 61 and the guiding mounting groove 72 causes the jaw to clamp or loosen the drill, and the screw extends from the rear end with a hole 73. The screw in which the hole 73 is located has a tubular shape, and the pipe wall of the tubular screw has a groove 71 extending through the pipe wall and extending forward from the rear end of the screw.

The present invention can be provided with one or more of the grooves 72 as long as the deformation of the screw portion where the groove 71 is located under the action of the centripetal force is elastic deformation, and can be restored in time after the centripetal force disappears. The number of the plurality of grooves 72 may be 2, 3, 4 or more. When the present invention is provided with a plurality of grooves 72, the plurality of grooves 72 may be evenly distributed along the circumferential direction of the tube, and the depth of the plurality of grooves 72 is preferably the same.

The groove 71 extends forward from the rear end in the axial direction of the screw, and the extending direction of the groove may also be inclined to the axial direction of the screw, as long as the screw portion where the groove 71 is located is deformed by the centripetal force. The elastic deformation can be restored in time after the centripetal force disappears.

The bottom of the groove 71 has a hole shape 74 having a diameter larger than the groove width, which contributes to the above-described elastic deformation and contributes to ensuring the uniformity of the depth of the plurality of grooves during processing.

In this embodiment, further, the guiding mounting groove 72 is a chute inclined to the axis of the screw 7, the inner end of which is at the front and the outer end is at the rear, and the clamping jaw 8 is provided to be mounted on the guiding mounting groove. A tilting slider 81 in 72 that cooperates with its sliding guide. Thus, in operation, the guide mounting groove 72 can generate a radially outward force on the slider 81, which makes the operation of the drill chuck loosening the drill more easily. The further technical solution can be added to the above technical solution. Simultaneously, it can be used alone without the above-described grooves 71.

Reference numeral 11 is a connecting hole coaxial with the threaded hole 12 on the rear side of the connecting body for connection with the driving machine. Reference numeral 2 is a rear sleeve of a self-tightening chuck which is fixed to the connecting body. Reference numeral 3 is a drill body of a self-tightening chuck, which is rotatably sleeved on the connecting body 1, the front end of which is screwed to the front sleeve 5 and the jaw guide frame 6, respectively, and reference numeral 4 is the connector body 1 and Balls between the drill bodies. Embodiment 2, refer to Figures 5, 6, and 7.

In this embodiment, the difference from Embodiment 1 is:

A self-locking structure is attached to the self-tightening chuck. It is also provided with a middle sleeve 9 outside the drill body, and the drill body 3 is rotated by the operation of the sleeve 9, thereby driving the front sleeve 5 and the jaw guide frame 6 which are screwed at the front end thereof to rotate. The self-locking mechanism includes a pawl 91 rotatably mounted in a hole in the wall of the drill body, a ring ratchet 13 matching the pawl 91 on the surface of the connecting body 1, a spring 92 for pushing the pawl out of the ratchet, The cam surface 93 of the inner wall of the control pawl, the positioning steel ball 94 disposed on the drill body 3, and the spring 95, the corresponding inner teeth of the inner sleeve and the positioning steel ball 94 are respectively engaged and disengaged. Two positioning grooves 96 of the state.

The driving relationship between the middle sleeve 9 and the drill body 3 is achieved by the following structure: the inner wall of the middle sleeve is provided with two planes 97 for respectively rotating the drill body 3 in the direction of the loosening of the jaws and rotating the jaws, and the surface and plane of the drill body 97 mating plane 98. The other parts of the embodiment are the same as those of the first embodiment, and the same reference numerals as in Figs. 1, 2, 3, 4a, 4b, and c in this embodiment represent the same meanings.

Claims

Claim

1. An anti-lock self-tightening drill chuck, comprising a connecting body coupled to a driving machine, a jaw guiding frame coaxial with the connecting body and rotatable relative to the connecting body, a clamping jaw, and a connector a screw threadedly connected to the threaded hole, the jaw is slidably coupled to a guide groove on the jaw guide frame, and the jaw is slidably coupled to the guide mounting groove at the front of the screw, and the external thread on the screw is a left-hand thread, which is characterized in that The screw has a hole extending forward from the rear end such that the screw in which the hole is located is tubular, and the pipe wall of the tubular screw is provided with a plurality of grooves extending through the pipe wall and extending forward from the rear end of the screw.

2. An anti-lock self-tightening drill chuck according to claim 1 having one or more of said grooves.

3. An anti-lock self-tightening drill chuck according to claim 1, characterized in that it has a plurality of said grooves, said plurality of grooves being evenly distributed along the circumferential direction of the tube, said plurality of grooves The depth is consistent.

4. An anti-lock self-tightening drill chuck according to claim 1, 2 or 3, wherein said groove extends forwardly from the rear end in the axial direction of the screw.

An anti-lock self-tightening drill chuck according to claim 4, wherein the bottom of the groove has a hole shape having a diameter larger than the groove width.

6. The anti-lock self-tightening drill chuck according to claim 1, wherein the guide mounting groove is a chute inclined to the screw axis, the inner end of which is at the front and the outer end at the rear. The clamping jaw is provided with a tilting slider mounted in the guiding mounting groove and slidably engaged with the sliding guide.