CN2609691Y

CN2609691Y - Locking type drill chuck

Info

Publication number: CN2609691Y
Application number: CN 03242814
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: 2004-04-07
Anticipated expiration: 2013-04-01

Abstract

The utility model discloses a locking type drill chuck, comprising a drilling body, a front sleeve and a rear sleeve. The rear end of the drilling body is fixedly provided with a rear cover which is provided with at least a movable block and a positioning block along circumference, with a spring and a ball arranged in the movable block. The front sleeve is opened with a tooth slot, and the rear sleeve is provided with teeth engaged with the tooth slot. A groove is opened at corresponding position of every ball, the groove is blocked with the ball, a groove parallel to the groove blocked with the ball is opened on the side near the teeth, and central distance between the two grooves is not less than vertical run-distance between the teeth and the tooth slot in non-engage state. A positioning groove is opened at corresponding position of every positioning block which is arranged in the positioning groove in slidable mode. The locking type drill chuck of the utility model has simple structure, can avoid clamping jaw loosening when the drill chuck is closely held by hand to work, and is particularly applicable for utilizing in impacted working conditions with frequent load.

Description

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 that especially a kind of drilling machine uses.

Background technology

Drill chuck of the prior art includes drill body 1, jaw 4, screw 3, protheca 2 and back cover 6 as shown in Figure 5.Have three uniform oblique circular holes on the 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, and screw 3 is a two halves formula structure, adopt key cover 31 to connect between protheca 2 and the screw 3 and transmit moment of torsion.The rear end of drill body 1 is provided with back cover 6, is provided with one group of ball 5 in order to guarantee screw 3 with respect to freely rotating between the 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 of the generation of ball 5 between screw 3 and hollow drill body 1; Two, the sliding friction torque that the contact plane of small part produces between screw 3 and the hollow drill body 1; So the friction torque that will overcome when relatively rotating between screw 3 and the 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 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 locking type clamping head of drill of jaw in when work.

The technical solution adopted in the utility model is: a kind of locking type clamping head of drill, comprise a drill body, a protheca and a back cover, described drill body rear end is installed with a bonnet, this bonnet edge is circumferentially with at least one movable block and a positioning block, and a spring and a ball are installed in each movable block; Described protheca back end outer circumference wall has a series of teeth groove; Put after described and be provided with the tooth that is meshed with described teeth groove, having a groove with described each ball corresponding position, this groove engages with described ball, and having a groove that parallels with above-mentioned groove in addition near direction one side of described tooth, the centre-to-centre spacing of above-mentioned two grooves is not less than the vertical stroke of described tooth and teeth groove disengaging engagement, and the described groove of each bar can hold the radius of the degree of depth of described ball less than this ball, have a locating slot on the position corresponding with described each locating piece, described locating piece is installed in this locating slot in the mode that can slide.

The technical scheme that adopts the utility model to provide, spring push ball in the bonnet engages with the groove of back cover, by the axial displacement of groove with respect to ball, ball is held by different grooves the back cover is carried out axial location, make the tooth of back cover and the teeth groove of protheca be in engagement or disengaged position.When the utility model clamps drill bit, can make described tooth and teeth groove be in engagement, can not rotate 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 utility model reliable lock, easy to use, the security reliability when having improved drill chuck work.

Description of drawings

Fig. 1 is the structural representation of the utility model locking type clamping head of drill;

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

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

Fig. 4 is the cross-sectional view of second kind of embodiment of the utility model locking type clamping head of drill;

Fig. 5 is the structural representation of drill chuck in the prior art.

The specific embodiment

As embodiment of the present utility model, locking type clamping head of drill as shown in Figure 1, comprise a drill body 1, the edge circumferentially is provided with the inclined hole of three inclinations equally spacedly in the drill body 1, one jaw 4 is installed in each inclined hole slidably, described drill body 1 middle part is provided with a screw 3, and this screw 3 and each jaw 4 interconnect by screw thread.Drill body 1 studs with an inserts 21 made of iron at the middle part, drill body 1 front end is equipped with protheca 2, this protheca 2 is fixedlyed connected with iron inserts 21, has a series of teeth groove at protheca 2 back end outer circumference walls, and protheca 2 transmits moment of torsion by the interference fit between iron inserts 21 and the screw 3.Screw 3 rear ends are provided with ball 5, realize relative motion between screw 3 and the drill body 1 by ball 5.Drill body 1 rear end is provided with bonnet 9, interference fit between the two, and as shown in Figure 2, this bonnet 9 is provided with a movable block 91 and a locating piece 92.This movable block 91 is provided with a non-penetrating hole, is provided with ball 8 and spring 7 in the hole, and these spring 7 one ends lean the diapire other end pushing tow ball 8 in described hole.Back cover 6 is installed in the rear end of drill body 1, and as shown in Figure 3, this back cover 6 is provided with the tooth that is meshed with the teeth groove of protheca 2, is having a groove 62 with ball 8 corresponding positions, and this groove 62 cooperates with ball 8.In direction one side near described tooth, back cover 6 has a groove 64 that parallels with above-mentioned groove 62 in addition, article two, the centre-to-centre spacing M of groove 62,64 is not less than the vertical stroke N of described tooth and teeth groove disengaging engagement, and the described groove 62 of each bar or 64 can hold the radius of the depth H of ball 8 less than this ball 8, have a locating slot 63 on the position corresponding with locating piece 92, locating piece 92 is installed in this locating slot 63 in the mode that can slide.

Since the thickness of the circumferential wall of back cover 6 in design and add be subjected to man-hour other zero, the restriction of parts and thinner so that the degree of depth of locating slot 63 is more shallow, when locating piece 92 slides up and down in locating slot 63, from locating slot 63, skid off easily.In order to solve this technical problem, back cover 6 can be provided with gusset 61 on the position corresponding with locating piece 92, and described locating slot 63 is opened on the gusset 61, to increase the degree of depth of locating slot 63.

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

At first, the utility model locking type hand fastening drill clutch is fastened on the drill press spindle by the screwed hole of drill body 1 upper end.Back cover 6 is applied power upwards, because groove 62 engage with ball 8 and holds the radius of the depth H of ball 8 less than ball 8, institute overlaps 6 pairs of balls, 8 generations one power radially later on, promptly 6 ejection balls 8 are overlapped in the back, ball 8 pressuring springs 7, spring 7 contraction distortions, ball 8 is reduced in the movable block 91.When the back was overlapped 6 axial displacements to groove 64, ball 8, engaged with groove 64 by ejecting in the movable block 91 by the ejection of the restoring force of spring 7.Unclamp back cover 6, because the engaging of groove 64 and ball 8, the back is overlapped 6 and is no longer produced axial displacement.Because the centre-to-centre spacing M of groove 62 and groove 64 is not less than described tooth and teeth groove breaks away from the vertical stroke N of engagement, in above-mentioned course of action, when ball 8 engaged with groove 64, described tooth and teeth groove can break away from engagement, promptly can be relative between protheca 2 and the back cover 6 freely rotate.At this moment, rotation direction rotation protheca 2 according to screw thread, protheca 2 drives screw 3 and rotates, three jaws 4 are moved upward simultaneously, the opening that three jaws are 4 increases, then drill bit is inserted wherein, drive screw 3 by opposite direction rotation protheca 2 again and rotate, make three jaws 4 move downward and drill bit is clamped.After drill bit is clamped, with hand back cover 6 is applied downward power, make the utility model still be in state as Fig. 4, promptly the tooth of back cover 6 and the teeth groove of protheca 2 are in engagement, and drill bit is locked, and can begin drilling.Like this, even produce bigger shock loading at work, because the engagement of tooth and teeth groove can not relatively rotate between back cover 6 and the protheca 2, promptly can not relatively rotate between screw 3 and the drill body 1, jaw 4 does not produce motion, and drill bit can not get loose.So the technical solution of the utility model has solved hand fastening drill clutch at work owing to the effect of shock loading produces the loosening problem of drill bit.

Principle according to above-mentioned disclosed technical scheme, can be on the bonnet 9 respectively along being circumferentially with a plurality of movable blocks 91 and a plurality of locating piece 92, and ball 8 and spring 7 are installed in each movable block 91, corresponding to having locating slot 63 on the locating piece 92 back covers 6, corresponding to having groove 62, groove 64 on the ball 8 back covers 6.

Second kind of embodiment of the present utility model, as shown in Figure 4, for make back cover 6 when the axially-movable stressed evenly, displacement is steady, circumferentially is respectively equipped with three equally distributed movable blocks 91 and three equally distributed locating pieces 92 in bonnet 9 upper edges.

The cross section of described groove 62, groove 64 can be processed into circular arc, with the stationarity of the relative motion between assurance and the ball 8.

In addition, as shown in Figure 1, the external peripheral surface of protheca 2 and back cover 6 has been formed separately some fins 23 and chase 65, so that the operator installs and bit change more.

Claims

1, a kind of locking type clamping head of drill, comprise a drill body, a protheca and a back cover, it is characterized in that: described drill body rear end is installed with a bonnet, and this bonnet edge is circumferentially with at least one movable block and a positioning block, and a spring and a ball are installed in each movable block; Described protheca back end outer circumference wall has a series of teeth groove; Put after described and be provided with the tooth that is meshed with described teeth groove, having a groove with described each ball corresponding position, this groove engages with described ball, and having a groove that parallels with above-mentioned groove in addition near direction one side of described tooth, the centre-to-centre spacing of above-mentioned two grooves is not less than the vertical stroke of described tooth and teeth groove disengaging engagement, and the described groove of each bar can hold the radius of the degree of depth of described ball less than this ball, have a locating slot on the position corresponding with described each locating piece, described locating piece is installed in this locating slot in the mode that can slide.

2, locking type clamping head of drill according to claim 1 is characterized in that: be covered with the circumferentially evenly distribution of a plurality of movable blocks and locating piece and edge after described.

3, locking type clamping head of drill according to claim 1 is characterized in that: the cross section of described groove is a circular arc.

4, according to claim 1,2 or 3 described locking type clamping head of drill, it is characterized in that: the external peripheral surface of described protheca and back cover has been formed separately some fins and chase.