CN2604260Y

CN2604260Y - Locking drill chuck

Info

Publication number: CN2604260Y
Application number: CN 03242729
Authority: CN
Inventors: 周文华
Original assignee: SAN-OU DRILL HOLDER MANUFACTURING Co Ltd TAIZHOU CITY
Current assignee: Zhejiang Sanou Machinery Co Ltd
Priority date: 2003-04-01
Filing date: 2003-04-01
Publication date: 2004-02-25
Anticipated expiration: 2013-04-01

Abstract

The utility model discloses a new locking-type drill chuck, which comprises a hollow drill body, a front sleeve, a back sleeve and a nut sleeve, a middle sleeve is arranged between the front sleeve and the back sleeve; the inner wall of the back sleeve is provided with a series of ratchet along the circumferential direction, the position corresponding to the ratchet, the back end of the middle sleeve is arranged with at least one hole, each hole is provided with a spring leaf which is meshed with the ratchet; the outer wall of the back end of the front sleeve is arranged with at least one bond, the inner wall is provided with at least one pair of mutual parallel arc groove; the position corresponding to the bond, the middle is provided with a keyway which is matched with the bond, the position corresponding to the arc groove on the side closed to the back end of the back sleeve in each pair of arc groove, the middle sleeve is provided with a movable head which is embedded with the arc groove. The utility model is reliable in locking, the safety and reliability of the drill in working are greatly improved, the utility model is particularly applicable to be used under the working conditions of impact and heavy load.

Description

Novel locking type clamping head of drill

Technical field

The utility model relates to the drill holder that a kind of machining equipment uses, the drill chuck that can lock during work that especially a kind of drilling machine uses.

Background technology

Drill chuck of the prior art as shown in Figure 8, includes hollow drill body 1, jaw 4, screw 3, protheca 2 and back cover 9.Have three uniform oblique circular holes on the hollow drill body 1, three jaws 4 are installed in respectively in three above-mentioned oblique circular holes.Adopt thread connection between screw 3 and the jaw 4, screw 3 is a two halves formula structure, adopts interference fit between nut sleeve 5 and the screw 3.Adopt interference fit to transmit moment of torsion between nut sleeve 5 and the protheca 2, or be provided with the structure transmission moment of torsion that transmits moment of torsion, for example working face between the two is made as prismatic surface or key and the keyway arrangements etc. that are complementary; When being when being provided with the structure of transmitting moment of torsion between nut sleeve 5 and the protheca 2, be provided with syndeton between protheca 2 and the back cover 9, avoid protheca 2 to break away from nut sleeves 5.In order to guarantee that screw 3 is provided with one group of ball 6 with respect to freely rotating between the hollow drill body 1.

The friction torque that will overcome when relatively rotating between this drill chuck screw 3 and the hollow drill body 1 is: one, the rolling friction torque that produces between screw 3 and hollow drill body 1 of ball 6; Two, the sliding friction torque that the contact plane of small part produces between screw 3 and the hollow drill body 1 is so the friction torque that will overcome when relatively rotating between screw 3 and the hollow drill body 1 is relative less.When this drill chuck is subjected to shock loading or heavy load at work, relatively rotate easily between screw 3 and the hollow drill body 1, make the drill slipping of jaw 4 clampings or loosening, so that the normal production work of influence.

The utility model content

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provide a kind of simple in structure, prevent that drill chuck from producing the loosening novel locking type clamping head of drill of jaw in when work.

The technical solution adopted in the utility model is: a kind of novel locking type clamping head of drill, include a hollow drill body, a protheca, a back cover and a nut sleeve, and adopt interference fit between described protheca and the described nut sleeve, between this protheca and this back cover cover in is installed; This cover inwall edge, back is circumferentially with a series of ratchets, the position corresponding with this ratchet, and the rear end of described middle cover has at least one hole, and in each hole a spring leaf is installed, this spring leaf and described ratchet engagement; Described protheca rear end outer wall is provided with at least one key, and inwall is provided with at least one pair of arc groove that is parallel to each other; The position corresponding with described key, put in described and have keyway, this keyway matches with described key, and with described each in the arc groove near corresponding position of arc groove of this back cover rear end one side, be arranged with a movable head in described, this movable head engages with this arc groove.

The technical scheme that adopts the utility model to provide, when drill chuck is subjected to bigger shock loading at work, because the locking mechanism that the ratchet of back cover and the spring leaf of middle cover are connected with a joggle, be difficult for rotating between screw and the hollow drill body is that jaw does not produce displacement with respect to screw, drill bit can not get loose, the security reliability when having improved drill chuck work greatly.

Description of drawings

Fig. 1 is the structural representation of first kind of embodiment of novel locking type clamping head of drill of the present utility model;

Fig. 2 is the cutaway view along A-A among Fig. 1;

Fig. 3 is the cutaway view along B-B among Fig. 1;

Fig. 4 is the partial enlarged view of novel locking type clamping head of drill of the present utility model;

Fig. 5 is the structural representation of second kind of embodiment of novel locking type clamping head of drill of the present utility model;

Fig. 6 is the cutaway view along A-A among Fig. 5;

Fig. 7 is the cutaway view along B-B among Fig. 5;

Fig. 8 is the structural representation of drill chuck in the prior art.

The specific embodiment

First kind of embodiment of the present utility model, referring to Fig. 1 to Fig. 4, novel locking type clamping head of drill comprises a hollow drill body 1, along the inclined hole that circumferentially offers three inclinations equally spacedly, a jaw 4 is installed slidably in each inclined hole in this hollow drill body 1.The middle part of hollow drill body 1 is equipped with a screw 3, and this screw 3 is a two halves formula structure, interconnects by screw thread with each described jaw 4.Adopt interference fit between nut sleeve 5 and the screw 3, adopt interference fit to transmit moment of torsion between nut sleeve 5 and the protheca 2.The rear end of hollow drill body 1 is equipped with a back cover 9, adopts interference fit between hollow drill body 1 and the back cover 9, is provided with between protheca 2 and back cover 9 and overlaps 7 in one.Cover 9 inwalls in back are along being circumferentially with a series of ratchets 91, the rotation direction of its profile of tooth during with the clamping drill bit rotation direction of protheca 2 opposite.The position corresponding with ratchet 91, the rear end of middle cover 7 has hole 73, and a spring leaf 8 is installed in this hole 73, this spring leaf 8 and ratchet 91 engagements.Protheca 2 rear end outer walls are provided with a key 23, and inwall is provided with a pair of arc groove that is parallel to each other 22,24; The position corresponding with key 23 has keyway 71 on the middle cover 7, and this keyway 71 matches with key 23.With near the corresponding position of the arc groove 22 of back cover 2 rear ends one side, middle cover 7 is provided with a movable head 72, this movable head 72 engages with this arc groove 22.Between screw 3 rear end faces and the hollow drill body 1 middle bench face one group of ball 6 is installed, to guarantee being free to rotation between screw 3 and the hollow drill body 1.

The course of work of the present utility model is as follows:

At first by the screwed hole of hollow drill body 1 upper end, novel locking type clamping head of drill of the present utility model is fastened on the drill press spindle, middle cover 7 is pulled down, movable head 72 produces strain and skids off from the arc groove 22 that fastens with it, when movable head 72 is moved to arc groove 24 places, because the effect of elastic-restoring force engages with arc groove 24.At this moment, middle cover 7 produces relative displacement with back cover 9, and ratchet 91 breaks away from engagement with spring leaf 8, rotate described protheca 2 according to the rotation direction of screw thread, protheca 2 drives nut sleeves 5 and screw 3 rotates, and three jaws 4 are moved upward simultaneously, and the opening that three jaws are 4 increases.Drill bit is inserted in the opening of 4 of three jaws, cover 7 makes the utility model be in operating position shown in Figure 1 again in upwards drawing, and promptly movable head 72 engages with arc groove 22, and ratchet 91 is in engagement again with spring leaf 8.Again by opposite direction rotation protheca 2, because the rotation direction of the profile of tooth of ratchet 91 rotation direction of protheca 2 when clamping drill bit is opposite, spring leaf 8 produces strains, and protheca 2 drives nut sleeves 5 and screw 3 rotations, three jaws 4 are moved downward and drill bit is clamped, can begin drilling.After drill bit was clamped, spring leaf 8 was between two teeth of ratchet 91, because the profile of tooth rotation direction of above-mentioned ratchet 91, spring leaf 8 can not produce reciprocal strain, has both made and can play good locking effect yet when being subjected to bigger external force.

Second kind of embodiment of the present utility model, referring to Fig. 5, can be provided with the structure of transmitting moment of torsion between protheca 2 and the nut sleeve 5, for example working face between the two is made as prismatic surface or key and the keyway arrangements etc. that are complementary, to replace the interference fit between protheca 2 and the nut sleeve 5.Break away from for fear of protheca 2 and nut sleeve 5, having a cross section at the front end of hollow drill body 1 is leg-of-mutton ring-shaped groove 11, the front end of protheca 2 and groove 11 clampings.

As shown in Figure 6, can be along protheca 2 three keys 23 circumferentially are set uniformly, and correspondingly on middle cover 7 have three keyways 71, in making cover 7 in the course of work that slides up and down stressed evenly, and under the less situation of the utility model volume, can guarantee the compactedness of its structure.According to same principle can with movable head 72 along in cover 7 circumferentially be made as three uniformly, and have three pairs of arc grooves 22,24 in protheca 2 correspondences.

Stressed even in the rotation with respect to hollow drill body 1 when clamping drill bit in order to overlap 7 in guaranteeing, can along in cover 7 circumferentially have three holes 73 uniformly, and a spring leaf 8 is installed in each hole 73, as shown in Figure 7, above-mentioned spring leaf 8 is meshed with ratchet 91 respectively.

In addition, the external peripheral surface of protheca 2, back cover 9 and middle cover 7 is formed separately some fins 74 and groove 34, so that the operator installs and change drill chuck.

Claims

1, a kind of novel locking type clamping head of drill includes a hollow drill body, a protheca, a back cover and a nut sleeve, adopts interference fit between described protheca and the described nut sleeve, it is characterized in that: between described protheca and the described back cover cover in is installed; This cover inwall edge, back is circumferentially with a series of ratchets, the position corresponding with this ratchet, and the rear end of described middle cover has at least one hole, and in each hole a spring leaf is installed, this spring leaf and described ratchet engagement; Described protheca rear end outer wall is provided with at least one key, and inwall is provided with at least one pair of arc groove that is parallel to each other; The position corresponding with described key, put in described and have keyway, this keyway matches with described key, and with described each in the arc groove near corresponding position of arc groove of this back cover rear end one side, be arranged with a movable head in described, this movable head engages with this arc groove.

2, novel locking type clamping head of drill as claimed in claim 1, it is characterized in that: the structure that is provided with a transmission moment of torsion between described protheca and the described nut sleeve, it is leg-of-mutton ring-shaped groove that the front end of described hollow drill body has a cross section, the front end of described protheca and this groove clamping.

3, novel locking type clamping head of drill as claimed in claim 1 or 2 is characterized in that: described protheca edge circumferentially is provided with three described keys uniformly, and corresponding putting in described has three described keyways.

4, novel locking type clamping head of drill as claimed in claim 1 or 2 is characterized in that: described protheca edge circumferentially has three pairs of described arc grooves uniformly, and corresponding putting in described is provided with three movable heads.

5, novel locking type clamping head of drill as claimed in claim 1 or 2 is characterized in that: the cover edge circumferentially has three described holes uniformly in described, and a described spring leaf is installed in each described hole.

6, novel locking type clamping head of drill as claimed in claim 1 or 2 is characterized in that: the external peripheral surface of described protheca, back cover and middle cover is formed separately some fins and groove.