WO2006119685A1

WO2006119685A1 - A self-locking type manually tightened drill chuck

Info

Publication number: WO2006119685A1
Application number: PCT/CN2005/002348
Authority: WO
Inventors: Wenhua Zhou; Qiang Zhao
Original assignee: Zhejiang Sanou Machinery Co., Ltd.
Priority date: 2005-05-13
Filing date: 2005-12-28
Publication date: 2006-11-16
Also published as: CN2787343Y

Abstract

The present invention relates to a self-locking type manually tightened drill chuck. The drill chuck comprises a chuck body, a plurality of jaws, a nut connected to the jaws by thread, a rotational sleeve axially limited and used as operating the nut, a elastic locking element, and a ring element connected to the nut for mounting the elastic locking element. The chuck body has a saw-tooth ring engaged with the elastic locking element. The internal wall of the rotational sleeve has such a construction that controls the engaging conditions of the elastic locking element and the saw-tooth ring. The present invention solves the self-locking problem of the drill chuck by having the nut connected the chuck body fixedly. The present invention has the advantage of a simple structure, and it can be used for a single set of drill chuck and two sets of drill chuck. Further, the elastic locking element is mounted onto the nut by the ring element, so can simplify the processing of parts, and attain a convenience of assembling parts. Also, it can provide high locking force.

Description

A new type of self-locking hand drill chuck

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

In the prior art, the hand drill chuck is provided with a rotary sleeve of a drill body, a jaw, a nut and an operating nut, and the three jaws are respectively disposed in three inclined holes uniformly distributed on the drill body, and the nut jaws are Threaded connection is used to operate the rotating sleeve to rotate the nut to drive the jaws into and out of the inclined hole to clamp or release the drill. The rotating sleeve can be operated by the rotating sleeve and the nut directly to drive the nut, or The nut is indirectly connected to the nut by one or several intermediate elements, and the torque is transmitted to the nut through the intermediate element 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 drawbacks, but the structure is relatively complicated, and 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 novel self-locking hand 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 rotating sleeve of the axially restricted operating nut, and an elastic locking element and a nut connection The ring-shaped member of the elastic locking member is provided with a saw ring that cooperates with the elastic locking member, and the inner wall of the rotating sleeve is provided with a configuration for controlling the state in which the elastic locking member is engaged with the saw ring. Because the above technical solution is adopted, the utility model solves the self-locking problem of the drill chuck by locking the nut with the drill body, and the structure is simpler, and can be applied to a single set of drill chucks and a double set of drill chucks. At the same time, the elastic locking component is mounted on the nut by the ring component, which simplifies the processing of the component and facilitates assembly, and the locking force is stronger.

The elastic locking element comprises a length of spring piece for locking function, the spring piece is provided with an outward protrusion, and one end of the spring piece is a locking end that cooperates with the saw ring, the inner wall of the rotating sleeve controls the locking element and the saw ring The structure of the mating state is a groove that cooperates with the protrusion. 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.

The manner in which the serrated ring is disposed on the drill body may be directly formed on the surface of the drill body, or the serrated ring may be first formed into a ring-shaped component and then mounted on the surface of the drill body, and the sawtooth ring may be disposed on the drill body. Different parts can be placed either in front of the nut or behind the nut.

The way the saw ring is set can also be used in other ways. For example, first set a part that is connected with the drill body, such as a sleeve, and then form the saw ring directly on the surface of the sleeve, or you can first make the ring gear into a loop component and then install it. To the surface of the sleeve, the sleeve may be an inner sleeve that is connected to the front end of the drill body. In the double drill chuck, the sleeve may also be used after the drill chuck cannot move relative to the drill body. set. For another example, the drill body is provided with a step at the rear end of the nut, and the sawtooth ring is sandwiched between the step and the nut, and the backward reaction force of the nut is caused by the drill chuck during the clamping operation and the drilling operation, so that The sawtooth ring is clamped by the nut and the step on the drill body during drilling

The inner wall of the rotating sleeve is provided with an indexing groove, and the nut is provided with an indexing key in the indexing groove. In this way, the locking and clamping operations are facilitated, which helps to improve the clamping force when the drill chuck is clamped.

The inner wall of the rotating sleeve is provided with a boss that cooperates with the ring member. In this way, the mounting member also acts as an axial limit on the rotating sleeve, making the result more compact and simple. DRAWINGS

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

Figure 2 is an exploded view of Embodiment 1 of the present invention.

Figure 3 is a cross-sectional view along line A-A of the embodiment of Figure 1 in an unlocked state.

Figure 4 is a cross-sectional view taken along line B-B of Figure 1.

Figure 5 is a half cross-sectional view of Embodiment 2.

Figure 6 is a schematic view of the elastic locking member of Embodiment 3. detailed description

Example 1

Refer to Figures 1, 2, 3, and 4. The utility model comprises a drill body 1, a clamping jaw 4, a nut 3 threadedly connected to the clamping jaw, a rotating sleeve 2 of an axially restricted operating nut, and an elastic locking element 9 and an elastic locking element connected with the nut. Ring element 8, the drill body is provided with a saw ring that cooperates with the elastic locking element 11. The inner wall of the rotating sleeve is provided with a configuration for controlling the state in which the elastic locking member is engaged with the saw ring.

In this embodiment, the double-drill chuck structure is taken as an example, and the saw ring can be directly processed on the outer circumference of the drill body, or a sawtooth part can be attached to the drill body. The saw ring of this embodiment is directly machined on the drill body in front of the nut.

The elastic locking member is provided with a mounting portion 94, and the outer circumference of the nut is provided with an elastic locking member mounting groove 32 that cooperates with the mounting portion. The ring member 8 is provided with a through slot 81, and the mounting portion 94 is provided with a male key 95 inserted into the slot 81 to further limit the elastic locking member.

Since the ring-shaped element is tightly clamped on the outside of the nut, it can also function as a nut sleeve while playing the elastic locking element, so that the nut can adopt a two-and-a-half assembly structure, which reduces the assembly difficulty of the drill chuck. .

The elastic locking element comprises a spring piece 95 for locking function, the spring piece is provided with an outward protrusion, and the protrusion comprises a protrusion 92 of the positioning end and a protrusion 91 of the locking end, and the locking protrusion 91 helps The formation of the locking ring 93 of the serrated ring one-way tooth lock and the increase of the locking force, as shown in Figures 3 and 4, the locking piece 93 of the spring piece and the ring gear are a one-way toothed lock, that is, when the spring piece When the locking end 93 falls into the serration of the saw ring, if the nut rotates in the direction of the clamping bit, the spring piece locking end 93 and the serration are in an unlocked state, but in the opposite direction, the spring piece locking end 93 and the sawtooth cause Hold each other and lock the teeth, the nut can not rotate in the opposite direction. The rotating sleeve inner wall controls the locking element to cooperate with the saw ring to form a groove that cooperates with the protrusion. The groove includes an unlocking state positioning groove 22 engaged with the positioning protrusion 92 and a locking state positioning groove 23 The groove 21 of the locking protrusion 91 is placed. These configurations of the inner wall of the rotating sleeve can be directly formed on the inner wall of the rotating sleeve, as shown in this embodiment; the configurations of the inner wall of the rotating sleeve can also be first formed into a correspondingly shaped part, and then the part is inlaid. Rotate the inner wall of the sleeve.

The inner wall of the rotating sleeve is provided with an indexing groove 24, and the nut is provided with an indexing key 31 in the indexing groove.

Reference numeral 5 is a collar provided in the middle of the drill body, which axially limits the rotary sleeve. The inner wall of the rotating sleeve is provided with a boss 25 which cooperates with the ring member. The cooperation of the boss 25 and the ring member can also axially limit the rotating sleeve at the same time.

Reference numeral 6 is a bearing steel ball, and reference numeral 7 is a rear sleeve which is not movable relative to the drill body.

When in the non-self-locking state, the spring piece locking end 93 and the ring gear 11 are in the disengaged state, the positioning protrusion 92 is in the positioning groove 22, and the elastic locking element is connected with the rotating sleeve, when placed in the clamping jaw After the drill, from the lower end of the drill chuck, turn the rotary sleeve clockwise, and the torque is transmitted from the elastic locking component to the nut to drive the nut to rotate, so that the jaws gradually gather and clamp the drill. Continue to rotate the rotating sleeve, at this time, the nut and the elastic lock The fixed component temporarily stops rotating, and after the rotating sleeve rotates through a certain angle, the rear wall of the indexing groove abuts against the indexing key of the nut. At the same time, the spring piece is pushed up by the inner wall of the rotating sleeve, and the locking end enters the sawtooth groove, convex 92 is in the groove 23. Continue to rotate the rotating sleeve to drive the nut and the elastic locking element 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 larger and larger until the tool is completely clamped. At this time, unless the rotary sleeve is rotated in the opposite direction when the operation is finished, the drill is loosened 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 operating the rotating sleeve. Rotating to achieve self-locking, so that even if the drill chuck is subjected to impact load during operation, the nut will not loosen and keep the drill chuck clamping the drill. Example 2

Referring to Figure 5, this embodiment takes a single set of drill chuck structures as an example. The locking structure of the drill chuck of this embodiment is the same as that of the first embodiment. Only another way is provided for the axial limiting structure of the rotating sleeve. The reference numeral 10 is a front cover which is in interference fit with the front end of the drill body, and the inner wall of the rotating sleeve is provided with a boss 25 which cooperates with the ring-shaped element. The cooperation of the front cover, the boss 25 and the loop member participates in the axial limitation of the rotary sleeve. Reference numeral 17 is a back cover which is not movable relative to the drill body, and reference numeral 15 is a gasket between the bearing steel ball 6 and the step of the drill body.

In Fig. 5, the same reference numerals as in Fig. 1 denote the same parts. Example 3

Refer to Figure 6. This embodiment provides another embodiment of the elastic locking member of the foregoing embodiment, which also includes a mounting portion 301 which is mounted in the same manner as the previous embodiment.

The elastic locking member is still provided with a piece of spring piece 302. The end of the spring piece 302 has a bifurcation. The locking protrusion 91 and the locking end 93 described in Embodiment 1 are on different branches, in this embodiment, respectively. 391 and 393 are indicated. This structure can alleviate the reaction of the locking projection on the inner wall of the rotating sleeve. In this embodiment, the inner wall configuration of the rotating sleeve is adjusted accordingly according to the bifurcation shape of the spring piece.

Others are the same as in the first embodiment.

Claims

Claim

1. A novel self-locking hand drill chuck comprising a drill body, a jaw, a nut threadedly coupled to the jaw, and a rotary sleeve of an axially constrained operating nut, characterized in that it is further provided with an elastic locking element and a ring-shaped member connected to the nut and mounted with an elastic locking member. The drill body is provided with a saw ring that cooperates with the elastic locking member, and the inner wall of the rotating sleeve is provided with a configuration for controlling the state in which the elastic locking member is engaged with the saw ring.

2. A novel self-locking hand drill chuck according to claim 1, wherein the ring-shaped member is sleeved on the outer circumference of the nut and is interference-fitted with the nut, and the elastic locking member is provided with a mounting portion, outside the nut. The circle is provided with an elastic locking element mounting groove that cooperates with the mounting portion.

3. A novel self-locking hand drill chuck according to claim 1 or 2, wherein the elastic locking member comprises a length of spring piece, the magazine piece is provided with an outward projection, and one end of the spring piece is serrated with The ring-fitted locking end, the inner wall of the rotating sleeve controls the locking element to cooperate with the saw ring to form a groove that cooperates with the protrusion.

4. A novel self-locking hand drill chuck according to claim 3, wherein the outward projection of the spring piece comprises a projection of the locking end and a projection of the positioning end, and the end of the spring piece has a bifurcation. The locking projection and the locking end are on different branches.

5. A novel self-locking hand drill chuck according to claim 3, wherein the outward projection of the spring piece comprises a projection of the locking end and a projection of the positioning end, and the end of the spring piece has a bifurcation. The locking projection and the locking end are on different branches.

A novel self-locking hand drill chuck according to claim 1 or 2, wherein the saw ring is disposed on the drill body in front of the nut.

A novel self-locking hand drill chuck according to claim 1 or 2, wherein the saw ring is disposed on the drill body behind the nut.

A novel self-locking hand drill chuck according to claim 1 or 2, wherein the inner wall of the rotary sleeve is provided with an indexing groove, and the nut is provided with an indexing key in the indexing groove.

A novel self-locking hand drill chuck according to claim 1 or 2, wherein the inner wall of the rotary sleeve is provided with a boss which cooperates with the loop member.