WO2007028287A1

WO2007028287A1 - A self-locking drill chuck

Info

Publication number: WO2007028287A1
Application number: PCT/CN2005/002349
Authority: WO
Inventors: Wenhua Zhou; Kailin Tan
Original assignee: Zhejiang Sanou Machinery Co., Ltd.
Priority date: 2005-09-09
Filing date: 2005-12-28
Publication date: 2007-03-15
Also published as: CN2832373Y

Abstract

The present invention relates to a self-locking drill chuck. The drill chuck comprises a chuck body, a plurality of jaws, a nut connected to the jaws by thread, a front sleeve axially limited and a rear sleeve, which cannot move with respect to the chuck body in an axial direction and a circumferential direction. The drill chuck is provided with an element having a spring leaf, which is connected to the nut and can rotate together with the nut synchronously. The spring leaf has a locking end, the front end of the rear sleeve is provided with a circle of saw-tooth, which is engaged with the locking end of the spring leaf in a single direction. The internal wall of the front sleeve has such a construction that connects to the spring leaf and controls a locking engagement of the spring leaf and the saw-tooth. In the present invention, the self-locking engagement of the drill chuck is realized by the locking engagement of the nut and the rear sleeve, which cannot move with respect to the chuck body in an axial direction and a circumferential direction. The present invention has a simpler structure, and more convenient during being assembled.

Description

Specification New type of locking drill chuck Technical field

The utility model relates to a drill chuck, in particular to a drill chuck mounted on a machining device and an electric tool such as a drill press and an electric drill. Background technique

In the prior art, the hand drill chuck is provided with a drill body, a jaw, a nut, a front sleeve of the operating nut, and a rear sleeve which is not movable relative to the drill body in the axial direction and the circumferential direction, and the three jaws are respectively disposed on the uniform cloth. In the three inclined holes on the drill body, the nut and the clamping jaw are threadedly connected, and the front sleeve is driven to rotate the nut to drive the clamping jaw into and out of the inclined hole to clamp or release the drilling tool, and the front sleeve operating nut The method may be that the front sleeve is directly connected with the nut to drive the nut, or may be indirectly connected to the nut through one or several intermediate members, and the torque is transmitted to the nut through the intermediate member to drive the nut. The disadvantage of this type of drill chuck is that under the impact load, the bit clamped by the jaw is easy to loosen or even fall off, and it is difficult to maintain the continuity of the processing.

For this reason, there is currently a hand-tight drill chuck with a self-locking function to overcome the above-mentioned defects, but the structure is complicated, the installation is inconvenient, the self-locking operation and the clamping operation are not consistent, which affects the convenience of operation. Summary of the invention

The technical problem to be solved by the utility model is to provide a new type of locking drill chuck with simple structure. To this end, the utility model adopts the following technical solutions: it comprises a drill body, a clamping jaw, a nut threadedly connected to the clamping jaw, a front sleeve of the axially defined operating nut, and a movement of the drill body in the axial and circumferential directions. The rear sleeve further comprises an element with a spring piece, the element is coupled with the nut and rotates synchronously with the nut, the spring piece has a locking end, and the front end of the rear sleeve is provided with a locking one-way tooth lock of the spring piece. The inner side wall of the front sleeve is provided with a configuration connected to the spring piece and a configuration for controlling the state in which the spring piece and the serration are engaged. The utility model solves the self-locking problem of the drill chuck by locking the nut with the rear sleeve locking mechanism which can not move relative to the drill body in the axial direction and the circumferential direction, and the structure is more

Confirmation It is also more convenient to install.

In the present invention, the spring-loaded component can be connected to the nut by a loop-shaped component, and the loop-shaped component has an interference fit with the nut. The spring-loaded component is provided with a mounting portion, and the mounting portion is clamped in the circle. Between the element and the nut. In this way, the nut and the spring-loaded component are easier to install and the torque transmission is more reliable.

The spring-loaded component can be mated to the nut in a variety of ways. For example, the upper end surface of the nut is provided with a mounting groove of a component with a spring piece, and the component with a spring piece is provided with a mounting portion that is coupled to the mounting groove. For example: the ball is provided with a ball at the rear of the nut, and the component with the spring piece is provided with a ring-shaped mounting portion. The mounting portion is sandwiched between the nut and the ball, and a structure for transmitting the torque between the mounting portion and the nut is also provided. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a half cross-sectional view showing the first embodiment of the present invention.

Figure 2 is a cross-sectional view taken along line A-A of Figure 1 in a non-self-locking state.

Fig. 3 is a cross-sectional view taken along line B-B of Fig. 1 in a non-self-locking state.

Figure 4 is a schematic exploded view of Figure 1.

FIG. 5 is a cross-sectional view of another front sleeve axial end limiting structure provided by the present invention. Fig. 6 is an exploded perspective view showing a portion of the structure shown in Fig. 5.

Figure 7 is an exploded view of Embodiment 2 of the present invention. detailed description

Example 1

Refer to the attached drawings. The utility model comprises a drill body 1, a clamping jaw 4, a nut 3 threadedly connected with the clamping jaw, a front sleeve 2 of an axially defined operating nut, a rear sleeve 6 which is movable in the axial direction and the circumferential direction, and which is movable relative to the drill body. Also included is an element 70 with a spring piece 7, which is mated with the nut and rotates in synchronism with the nut, the spring piece has a locking end 73, and the front end of the rear sleeve is provided with a ring of serrations that cooperate with the locking end one-way tooth lock of the spring piece 61. The inner wall of the front sleeve is provided with a configuration connected with the spring piece and a configuration for controlling the state in which the spring piece and the serration are engaged.

As far as the "front end of the back sleeve is serrated 61", it can be realized by various structures, and it can be used. In the shape of the front end surface of the back cover, it is also possible to form the serration 61, and the serpentine ring-shaped member is embedded on the front end surface of the rear cover. This embodiment adopts the former structure.

The one-way tooth lock fit can be understood as when the lock end of the spring piece falls into the serration of the saw ring, if the nut rotates in the direction of the clamp bit, the lock end of the spring piece and the saw tooth are not locked, but in the opposite direction, the spring The locking end and the serration are interlocked by each other and the nut is locked, and the nut cannot rotate in the opposite direction.

The element 70 with the spring piece not only transmits the torque when the front sleeve is operated, but also functions to cooperate with the serration to realize the self-locking of the drill chuck. The element 70 can be provided on the front end face or the rear end face of the nut. In this embodiment, the connection with the nut is achieved by the looped element 8 , and the looped component is interference-fitted with the nut. The spring-loaded component is provided with a mounting portion 74 , and the mounting portion is sandwiched between the looped component and the nut. Reference numeral 32 is a groove for the surface of the nut that engages with the mounting portion 74. Thus, the member 70 is coupled and rotated together with the nut. The ring member 8 is provided with a through-groove 81, and the mounting portion 74 is simultaneously inserted into the slot 81. , in order to further limit the elastic locking element. This type of connection is very convenient in assembly. The ring-shaped element is tightly clamped on the outside of the nut. It can also function as a nut sleeve while installing the elastic locking element, so that the nut can be used in two halves. Assemble the structure to reduce the assembly difficulty of the drill chuck. Even the body of the component 80 itself can be shaped as a nut sleeve and interference fit with the nut. As shown in Figures 1 and 4, the nut is mounted on the shoulder 100 in the middle of the drill body. A ring of balls is arranged between the rear end surface of the nut and the step in the middle of the drill body 5

The configuration in which the inner wall of the front sleeve is connected to the spring piece and the configuration in which the spring piece and the saw tooth are matched may be directly formed on the inner wall of the front cover, or may be connected to the inner wall of the front cover by a part having a corresponding surface configuration, thereby The inner wall of the front cover has the above configuration. These configurations of the present embodiment are directly formed on the inner wall of the front cover.

The spring piece is provided with an outward positioning protrusion 72, and the inner wall of the front sleeve is connected with the spring piece in a configuration of a groove 23 engaged with the positioning protrusion 72 in the self-locking state and in the non-self-locking state and the positioning convex The groove 22 is fitted. The spring piece is also provided with a projection 71 that cooperates with the configuration of the front cover of the control spring piece and the saw ring. The configuration of the front cover control spring piece and the saw ring is configured as a groove 21 that cooperates with the protrusion 71 and a front cover inner surface around the groove 21. In this way, the self-locking operation is the same as the clamping operation, and it becomes a continuation of the clamping operation. It is more in line with the usage habits, the operation is more convenient, and the hand feel is very good. Eye ij very P3 wall with turn

The BS promotes the clamping force when the high drill chuck is clamped.

The axial limit of the front sleeve can be used in a variety of ways, such as a front cover limit at the front end that is interference-fitted with the drill body, and the rear end is limited by the parts of the drill chuck that are connected or abutted thereto. As shown in FIG. 1 , another front end axial limiting manner of the front sleeve is provided. The axial limiting member is a mounting sleeve 10 provided with a rolling body 103 fixedly connected to the front end of the drill body, and the mounting sleeve includes an inner wall. 101 and the outer wall 102, the rolling body is disposed between the inner wall and the outer wall. The front end of the front sleeve is blocked by the axial stop member, and at the rear, the front sleeve is restrained by the engagement of the loop member 8 with the step 24 of the inner wall of the front sleeve. The inner wall of the front end of the front sleeve abuts against the outer wall 102, so that the front sleeve can be balanced and stabilized. In the present embodiment, the rolling elements use a needle roller. The mounting sleeve can be fixedly connected to the drill body by an interference fit of the inner wall 101 and the outer circumference of the front end of the drill body. Since the outer wall 102 can rotate on the surface of the needle roller, the limiting structure can also reduce the operation front sleeve. Friction when. Of course, the axial fit of the front sleeve can also be achieved by the interference fit of the inner wall of the front sleeve and the outer wall 102 of the mounting sleeve.

Refer to Figures 5 and 6. The figure further demonstrates another axial positioning manner for the front sleeve, the axial limiting member is an annular member 13, and the annular member and the front end of the drill body are provided with corresponding circular arc grooves 131, 14, in the circular arc groove Ball 12 is provided. Reference numeral 132 is a hole in which the ball is mounted on the ring member. As shown in FIG. 5, the front end inner wall of the front sleeve is provided with an insert 27, and the insert 27 is interference-fitted with the annular member 13, thereby achieving axial limitation of the front sleeve, and the limit structure can also be used to reduce the operation. The friction of the sleeve can also balance and stabilize the front sleeve. As shown, it has two turns of balls 12. Of course, the engagement of the ring element with the front sleeve may also be that the ring element only blocks the front sleeve at the front end of the front sleeve, and functions as an axial limit of the front end.

In Fig. 1, it also has a protective cap for the front cover. The protective cap encloses the outer circumference of the front end of the front cover to protect the front cover. In Fig. 1, the protective cap 9 is interference-fitted with the drill body such that the protective cap 9 can also participate in axial restraint of the front sleeve by the connection of the protective cap 9 to the front sleeve.

Refer to Figures 5 and 6. Another connection structure for the protective cap 9 and the drill body is illustrated in the figure, the protective cap being rotatably coupled to the front end of the drill body. Between the protective cap 9 and the front end of the drill body, a ring-shaped member 15 is fixedly connected to the protective cap. The annular member and the front end of the drill body are provided with corresponding circular arc grooves 151, 17, and balls 16 are arranged in the circular arc groove.

When in use, when in the non-self-locking state, as shown in Figures 2 and 3, the locking end 73 and serration of the spring piece 幵, the convex 72 is in the concave 22, the claw is inserted into the lower end of the head, and the front sleeve is rotated clockwise. Since the component 70 is not rotatably connected to the nut with respect to the nut, the torque is transmitted through the front sleeve and the component 70 is sequentially transmitted to the nut, and the nut is rotated at the same time. Gradually clamp the jaws to clamp the drill. Continue to rotate the front sleeve. At this time, the nut and the member 70 temporarily stop rotating. After the front sleeve is rotated through a certain angle, the rear wall of the indexing groove 25 and the indexing key 31 of the nut are simultaneously pushed up by the inner wall of the front sleeve. The locking end enters the serration groove, and the projection 72 is in the groove 23. Continue to rotate the front sleeve, and drive the nut and the component 7 to rotate. The locking end of the spring piece slides over the surface of the sawtooth groove, one tooth and one tooth, and the clamping force is getting larger and larger until the tool is completely clamped. At this time, unless the front sleeve is rotated in the reverse direction when the operation is finished, the drill is released according to the reverse procedure of the above steps. Since the locking end of the spring piece is held by the sawtooth, the nut cannot be reversed without the front sleeve being manipulated. The rotation is reversed to achieve self-locking, so that even if the drill chuck is subjected to an impact load during operation, the nut will not loosen, and the drill chuck is clamped to the drill. Example 2

Refer to Figure 7. This embodiment demonstrates another way of connecting a spring-loaded component to a nut. The ball 300 is provided at the rear of the nut 300, and the spring-loaded member is provided with a ring-shaped mounting portion 302. The mounting portion is sandwiched between the nut and the ball, and a structure for transmitting a torque is provided between the mounting portion and the nut. The structure that transmits the torque can be a keyway mating structure or an edge that transmits torque.

The ring-shaped mounting portion 302 is provided with a groove 303, and a nut sleeve 305 is connected to the outer portion of the nut. The upper end of the nut sleeve is provided with a key 304 which cooperates with the groove 303.

The other structures are the same as those in Figs. 1, 2, 3, and 4. In Fig. 7, the same reference numerals as in Figs. 1, 2, 3, and 4 denote the same parts.

Claims

Claim

1. A new type of locking drill chuck, comprising a drill body, a claw, a nut threadedly coupled to the jaw, a front sleeve of the axially defined operating nut, a rear sleeve that is non-movable relative to the drill body in the axial and circumferential directions, The utility model is characterized in that it further comprises an element with a spring piece which is coupled with the nut and rotates synchronously with the nut, the spring piece has a locking end, and the front end of the rear sleeve is provided with a ring of serrations which cooperate with the locking end one-way tooth lock of the spring piece. The inner wall of the front sleeve is provided with a configuration connected to the spring piece and a configuration for controlling the state in which the spring piece and the serration are engaged.

2. The novel locking drill chuck according to claim 1, further comprising a ring-shaped member that is interference-fitted with the nut, the spring-loaded member having a mounting portion, the mounting portion being clamped Between the ring element and the nut.

3. A novel locking drill chuck according to claim 1, wherein the upper end surface of the nut is provided with a mounting groove for the element with the spring piece, and the element with the spring piece is provided with a mounting portion for mating connection with the mounting groove.

4. The novel locking drill chuck according to claim 1, wherein the nut is provided with a ball at the rear, and the member with the spring piece is provided with a ring-shaped mounting portion, and the mounting portion is sandwiched between the nut and the ball. There is also a structure for transmitting torque between the mounting portion and the nut.

5. The novel locking drill chuck according to claim 1, wherein the spring piece is provided with an outward positioning protrusion, and the inner wall of the front cover is connected to the spring piece in a self-locking state and positioned. The groove of the convex fit and the groove that cooperates with the positioning protrusion in the non-self-locking state.

6. The novel locking drill chuck of claim 1 wherein the spring leaf is further provided with a projection that cooperates with the configuration of the front spring control spring and the saw ring.

7. The novel locking drill chuck according to claim 1, wherein the inner wall of the front sleeve is provided with an indexing groove, and the nut is provided with an indexing key in the indexing groove.

8. The new type of locking drill chuck according to claim, further comprising an axial limiting member of the front sleeve, wherein the axial limiting member is fixedly connected to the front end of the drill body and provided with rolling The mounting sleeve of the body includes an inner wall and an outer wall, and the rolling body is disposed between the inner wall and the outer wall.

9. The new type of locking drill chuck according to claim 1, further comprising an axial limiting member of the front sleeve, wherein the axial limiting member is an annular member, and the annular member and the front end of the drill body are provided. There is a corresponding arc groove, and balls are arranged in the arc groove.

10. The novel locking drill chuck of claim 1 further comprising a protective cap for the front sleeve, said protective cap being rotatably coupled to the front end of the drill body.