CN1313233C

CN1313233C - Force boosting type locking drill chuck

Info

Publication number: CN1313233C
Application number: CNB2005100610022A
Authority: CN
Inventors: 王朝霞; 邱清盈; ***
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2005-10-09
Filing date: 2005-10-09
Publication date: 2007-05-02
Anticipated expiration: 2025-10-09
Also published as: CN1748918A

Abstract

The present invention discloses a force boosting type locking drill chuck. The rear end of a drill body is provided with an axial hole connected with a drive shaft, and three clamping jaws are respectively installed in three homogeneously distributed inclined holes in the drill body and are meshed with nuts. The outer part of a front sleeve is provided with a rotatable force boosting lever which horizontally rotates to increase the torsion moment when a drill head is clamped and loosened, and after used, the force boosting lever can be embedded into a groove of the front sleeve. Simultaneously, a ratchet wheel is arranged at the middle part of the drill body, the inner wall of the corresponding position of the front sleeve is provided with a leaf spring, and the force boosting lever controls the leaf spring and the ratchet wheel to be meshed so that the drill chuck can be automatically locked. The present invention has the functions of increasing drill chuck pretightening force and automatic locking, and therefore, when in use, the drill chuck can not loosen a drilling tool because of vibration and impact. The present invention has the advantages of reasonable structure, stable performance, reliable working, safe use, etc., and is suitable for installing and clamping various drilling tools.

Description

Force boosting type locking drill chuck

Technical field

The present invention relates to clamping device, especially relate to a kind of force boosting type locking drill chuck.

Background technology

In the prior art, spanner drill chuck mainly is made up of drill body, screw, jaw, overcoat, spanner etc., and overcoat and screw tight fit with spanner rotating jacket umbrella tooth, drive the screw rotation during operation, and jaw is elongated or shortened, the unclamping and clamp of implementation tool.The great advantage of spanner drill chuck be owing to can obtain bigger screw thread pretightning force by the spanner effect, thereby makes drill bit be not easy at work to unclamp.But its shortcoming is problems such as spanner is easily lost, tooth easily skids.Hand fastening drill clutch has overcome some shortcomings of spanner drill chuck, mainly is made up of drill body, jaw, screw, protheca, back cover etc., and protheca is connected with screw, during use, hand is twisted the protheca rotation, and the moving jaw of protheca organizine master tape moves up and down, the unclamping and clamp of implementation tool.The great advantage of hand fastening drill clutch is easy to operate, does not need to use spanner, but because the force limited of hand, be difficult to obtain bigger pretightning force, in use, bigger vibration arranged, work under the situation of impacting, the self-locking performance of drill chuck just is difficult to satisfy the demand, and easily makes workpiece loosening during work.

Summary of the invention

Purpose of the present invention is exactly in order to overcome above-mentioned the deficiencies in the prior art, in conjunction with the advantage of spanner and hand fastening drill clutch, provides a kind of rational in infrastructure, has reinforcement function and locking function, a kind of force boosting type locking drill chuck of practical safety.

For achieving the above object, the technical solution used in the present invention is as follows: comprise drill body, the drill body rear end is provided with the axial hole that engages with the driving shaft of driven tool; Three jaws, jaw are installed in respectively in the inclined hole of three five equilibriums in the drill body; Screw, screw and three jaw engagements that are installed in the drill body inclined hole; The back cover is housed from top to bottom successively in the drill body rear end, middle cover and protheca, the small end of middle cover is contained in the cover of back, between back cover inner face and middle cover small end face spring is housed, back cover internal orifice dimension is to spring and steel ball are set, steel ball is located middle cover by spring, be positioned on the drill body of protheca ratchet is housed, in 180 ° of grooves of locating of protheca endoporus symmetry spring leaf is housed, the spring leaf ratchet of spring leaf one end can match with hook tooth, locate to have respectively two grooves for 180 ° of symmetry on the protheca external cylindrical surface, be embedded with the reinforcement bar in the groove respectively, locate to have respectively rectangular channel for 180 ° of protheca lower end symmetry, be contained in pin on two bearings in two rectangular channels and form with an end of two reinforcement bars respectively and be rotatably assorted, when two reinforcement bars forward the upright position to, locate in the hole of the big end of cover during the other end of two reinforcement bars can be stuck in.

The useful effect that the present invention has is:

Be provided with rotatable reinforcement bar in the protheca outside, when clamping and unclamping drill bit, the reinforcement bar horizontally rotates, play a part to increase moment of torsion, after the use, the reinforcement bar can embed in the protheca groove, the drill body middle part is provided with ratchet simultaneously, protheca corresponding position inwall is provided with spring leaf, and the engagement by reinforcement bar control spring sheet and ratchet makes the drill chuck self-locking.The present invention has and increases drill chuck pretightning force function, has auto-lock function simultaneously, drill chuck in use can or not impacted because of vibration make drilling tool loosening, have rational in infrastructure, stable performance, reliable operation, advantage such as safe in utilization is suitable for the clamping of various drilling tools.

Description of drawings

Fig. 1 is a structural principle schematic diagram of the present invention;

Fig. 2 is an A-A profile among Fig. 1;

Fig. 3 is the front view of the present invention when clamping and unclamping work;

Fig. 4 is a B-B profile among Fig. 3;

Fig. 5 is the left view of Fig. 3;

Fig. 6 is vertical view and the partial sectional view of Fig. 5;

Fig. 7 is the front view of protheca of the present invention;

Fig. 8 is the C-C profile of Fig. 7;

Fig. 9 is the structural representation of spring leaf 12 of the present invention;

Figure 10 is the structural representation of reinforcement bar 9 of the present invention.

Among the figure: 1, drill body, 2, back cover, 3, middle cover, 4, protheca, 4-1, groove, 4-2, groove, 4-3, through hole, 4-4, through hole, 4-5, rectangular channel, 4-6, rectangular channel, 4-7, hole, 4-8, hole, 5, bearing, 6, jaw, 7, back-up ring, 8, pin, 9, the reinforcement bar, 9-1, reinforcement bar groove, 10, screw, 11, bearing, 12, spring leaf, the projection of 12-1, spring leaf, 12-2, spring leaf ratchet, 13, ratchet, 14, spring, 15, steel ball, 16, spring.

The specific embodiment

The invention will be further described below in conjunction with drawings and Examples.

As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, the present invention includes drill body 1 rear end and be provided with the axial hole that engages with the driving shaft of driven tool, three jaws 6 are installed in respectively in the inclined hole of three five equilibriums in the drill body 1, screw 10 and three jaws, 6 engagements that are installed in drill body 1 inclined hole; Back cover 2 is housed from top to bottom successively in drill body 1 rear end, middle cover 3 and protheca 4, the small end of middle cover 3 is contained in the back cover 2, between back cover 2 inner faces and middle cover small end face spring 16 is housed, back cover 2 steel ball 15 and spring 14 assemblies are radially located middle cover 3, be positioned on the drill body 1 of protheca 4 ratchet 13 is housed, in 180 ° of grooves of locating of protheca 4 endoporus symmetries spring leaf 12 is housed, the spring leaf ratchet 12-2 of spring leaf 12 1 ends can match with ratchet 13 teeth, locate to have respectively two grooves for 180 ° of symmetry on protheca 4 external cylindrical surfaces, be embedded with reinforcement bar 9 in the groove respectively, locate to have respectively rectangular channel 4-5 for 180 ° of protheca 4 lower end symmetries, 4-6, be contained in two rectangular channel 4-5, pin 8 on two bearings 5 in the 4-6 forms with an end of two reinforcement bars 9 respectively and is rotatably assorted, when two reinforcement bars 9 forward the upright position to, location in the hole of the big end of cover 3 during the other end of two reinforcement bars 9 can be stuck in.

As shown in Figure 1 and Figure 2, the inclined hole of circumferential uniform three inclinations in edge in the drill body, three jaws 6 are installed in the inclined hole, can slide up and down along inclined hole, screw 10 is positioned at drill body 1 middle part, and the contact end face is provided with bearing 11, screw 10 and three jaw 6 thread connection between screw 10 and the drill body 1, by rotation screw 10, drive three jaws 6 and move up and down.Adopt interference fit to transmit moment of torsion between protheca 4 and the screw 10.Interference fit is adopted with back cover 2 in drill body 1 rear end, has between protheca 4 and back cover 2 and overlaps 3 in one.Protheca 4 front end outer wall places are equipped with bearing 5, and reinforcement bar 9 is bound up on the bearing 5 by pin 8, and 90 ° free to rotate, as shown in Figure 3.As Fig. 7, protheca shown in Figure 84 outer walls along being circumferentially with a series of grooves, wherein reinforcement bar 9 corresponding position groove 4-1,4-2, the set upper side extends to bearing 5 places always in the past, reinforcement bar 9 can embed protheca groove 4-1,4-2 place after turning to vertical direction.Protheca 4 corresponding bearings 5 places offer rectangular channel 4-5,4-6, reinforcement bar 9 passes through reinforcement bar groove 9-1, as shown in figure 10, and after reinforcement bar groove 9-1 rotates to level along pin 8, move fixingly along rectangular channel 4-5,4-6 to central axis direction, increase the rigidity and the rotating torque of reinforcement bar 9.Be provided with ratchet 13 in drill body 1 middle-end, correspondence position protheca inwall is provided with spring leaf 12, as shown in Figure 9, spring leaf 12 is provided with protruding 12-1, ratchet 12-2, spring leaf is fixed on protheca 4-7, in the 4-8 hole, protheca is at groove 4-1, the upper end of 4-2 has through hole 4-3,4-4, the protruding 12-1 of spring leaf can pass hole 4-3,4-4, when the reinforcement bar is horizontal, as Fig. 3, shown in Figure 4, spring leaf 12 is in free state, and ratchet 12-2 breaks away from ratchet 13, when reinforcement bar 9 turns to the upright position, as Fig. 1, shown in Figure 2, embed protheca groove 4-1, behind the 4-2, press to spring leaf projection 12-1, make spring leaf ratchet 12-2 and ratchet 13 engagements, make drill chuck be in locking state.Middle cover 3 is between protheca 4 and back cover 2, it can move up and down along back cover 2, offer locating hole in middle cover 3 rear ends, by after the spring 14 that puts and steel ball 15 location, central cover 3 moves up, middle cover 3 breaks away from protheca 4 and reinforcement bars 9, central cover 3 moves down, in cover 3 fixedly reinforcement bar 9 and protheca 4 be one, make drill chuck when high speed is rotated, reinforcement bar 9 can not thrown off protheca 4.

When the present invention works, cover 3 at first moving up, middle cover 3 breaks away from protheca 4 and reinforcement bars 9, as Fig. 3, Fig. 4, Fig. 5, shown in Figure 6, reinforcement bar 9 is under the effect of spring leaf projection 12-1, from protheca groove 4-1,4-2, eject, spring leaf ratchet 12-2 and ratchet 13 break away from simultaneously, and drill chuck is in non-locking state, and reinforcement bar 9 is rotated to level, rotate reinforcement bar 9 with hand, drive protheca 4 rotations, protheca 4 drives screw 10 by Desing of Interference Joint and rotates, and screw 10 is through the screw thread transmission, jaw is moved downward or upward, thereby the clamping and the pine of realizing drilling tool are unloaded.After drilling tool clamps, reinforcement 9 bars are embedded in protheca groove 4-1, the 4-2, as shown in Figure 1 and Figure 2, pressuring spring sheet projection 12-1 position, make spring leaf ratchet 12-2 and ratchet 13 engagements, make drill chuck be in locking state, simultaneously middle cover 3 is moved down, fixedly reinforcement bar 9 and protheca 4 make drill chuck become overall work.

Claims

1, a kind of force boosting type locking drill chuck comprises drill body (1), and drill body (1) rear end is provided with the axial hole that engages with the driving shaft of driven tool; Three jaws (6), jaw (6) are installed in respectively in the inclined hole of three five equilibriums in the drill body (1); Screw (10), screw (10) and three jaws (6) engagement that is installed in drill body (1) inclined hole; It is characterized in that: back cover (2) is housed from top to bottom successively in drill body (1) rear end, middle cover (3) and protheca (4), the small end of middle cover (3) is contained in the back cover (2), between back cover (2) inner face and middle cover small end face spring (16) is housed, back cover (2) internal orifice dimension is to spring (14) and steel ball (15) are set, steel ball (15) is located middle cover (3) by spring (14), be positioned on the drill body (1) of protheca (4) ratchet (13) is housed, in 180 ° of grooves of locating of protheca (4) endoporus symmetry spring leaf (12) is housed, the spring leaf ratchet (12-2) of spring leaf (12) one ends can match with ratchet (13) tooth, locate to have respectively two grooves for 180 ° of symmetry on protheca (4) external cylindrical surface, be embedded with reinforcement bar (9) in the groove respectively, locate to have respectively rectangular channel (4-5 for 180 ° of protheca (4) lower end symmetry, 4-6), be contained in two rectangular channel (4-5,4-6) pin (8) on Nei two bearings (5) forms with an end of two reinforcement bars (9) respectively and is rotatably assorted, two reinforcement bars (9) are when forwarding the upright position to, and the other end of two reinforcement bars (9) can be stuck in location in the hole of big end of middle cover (3).