CN203863090U - Drill chuck - Google Patents

Abstract

The utility model relates to a drill chuck which comprises a drill body, clamping jaws, nuts, nut sleeves, a steel mat, a rear sleeve, a front sleeve and a locking mechanism. The three clamping jaws are mounted in three equant inclined holes of the drill body, threads of the nuts and threads of the clamping jaws form a threaded transmission mechanism, and the front sleeve and the nut sleeves are connected in a driving mode. The steel mat is mounted on the drill body in an interference fit mode, the locking mechanism is located between the steel mat and the nuts and comprises a locking disc and locking balls, the locking disc is provided with ratchets, a plurality of through holes are formed in the end face of the locking disc, a slope is formed on the inner round face of each through hole, and the locking balls are movably arranged along the slopes of the through holes. A conical slope is arranged on the end face, facing the locking disc, of each nut. The locking mechanism with the simple structure is arranged, and when the clamping jaws are located at clamping positions and have the signs of loosing, the locking disc, the locking balls and the nuts can press the clamping jaws. The clamping jaws under the work state can be effectively prevented from loosing, and clamping firmness of the clamping jaws is improved.

Description

A kind of drill chuck

Technical field

The utility model relates to drilling attachment in a kind of hardware & tools and machine tool, specifically a kind of drill chuck.

Background technology

Existing existing drill chuck has the jaw of making and stretches out with clamping device, and jaw is retracted with the function of back off tool, and in order to prevent that jaw from getting loose when the clip position, many drill chucks are also provided with locking mechanism, to prevent that jaw from getting loose down in working order.But, the locking mechanism more complicated of existing drill chuck.

Summary of the invention

Technical problem to be solved in the utility model is to overcome above-mentioned the deficiencies in the prior art, provides a kind of simple in structure, easy for operation, can prevent the drill chuck getting loose under duty.

The technical scheme in the invention for solving the above technical problem is: a kind of drill chuck, it comprises drill body, jaw, screw, nut sleeve, steel pad, rear cover, protheca, retaining mechanism, three jaws are arranged on respectively in three decile inclined holes of drill body, screw is arranged in the screw groove of drill body, the screw thread of screw and jaw forms thread transmission, nut sleeve is fixedly connected with screw, and protheca drives and is connected with nut sleeve, the front end of described nut sleeve has the driven member radially extending internally, and the rear end of nut sleeve has elastic pawl, the front end of protheca has the driver slot matching with driven member, driven member has primary importance and the second place in driver slot, the rear end of protheca has the first groove and the first projection that match with elastic pawl, and the degree of depth of the first groove is greater than the first projection, also there is the second groove and the 3rd groove that match with elasticity locating detent, and the degree of depth of the second groove is same as the degree of depth of the 3rd groove, in the time that driven member is positioned at primary importance, elastic pawl is arranged in the first groove, in the time that driven member is positioned at the second place, elastic pawl is positioned in the first projection, described steel pad interference fit is arranged on drill body, described retaining mechanism is between steel pad and screw, and retaining mechanism comprises locking plate and lock ball, locking plate has ratchet, in the time that elastic pawl is positioned in the first projection, the teeth groove butt of elastic pawl and ratchet, it is characterized in that: on the end face of described locking plate, be provided with multiple through holes, through hole inner headed face has an inclined-plane, lock ball arranges movingly along through hole inclined-plane, and screw arranges a circular cone inclined-plane on the end face of locking plate.

Further, lock ball is arranged between steel pad and the inclined-plane of screw.

The utility model is by retaining mechanism simple in structure is set, and in the time that jaw is positioned at clip position and has loosening sign, locking plate, lock ball and screw in this retaining mechanism can compress jaw.Against existing technologies, the utility model is simple and reasonable, easy to use, can effectively prevent that under duty, jaw gets loose, and increases the firm degree of clamping of jaw.

Brief description of the drawings

Below in conjunction with accompanying drawing, the utility model is described further.

Fig. 1 is the utility model composition structural representation.

Fig. 2 is the cross-sectional schematic of the A-A of Fig. 1.

Fig. 3 is the cross-sectional schematic of the B-B of Fig. 1.

Fig. 4 is the structural representation of locking plate in the utility model.

Fig. 5 is the schematic top plan view of locking plate in the utility model.

Fig. 6 is the structural representation of nut sleeve in the utility model.

Fig. 7 is the structural representation of protheca in the utility model.

Fig. 8 is the structural representation of screw in the utility model.

Fig. 9 is the assembling schematic diagram of screw in the utility model, lock ball, locking plate.

Label in figure is: 1. drill body, 2. rear cover, 3. lining, 4. locking plate, 5. steel pad, 6. lock ball, 7. nut sleeve.8. protheca, 9. jump ring, 10. jaw, 11. screws.

Detailed description of the invention

As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, a kind of drill chuck of the utility model, comprises drill body 1, jaw 10, lining 3, rear cover 2, screw 11, nut sleeve 7, protheca 8, steel pad 5, lock ball 6, jump ring 9, locking plate 4.Wherein in drill body 1, be provided with three inclined holes that are uniformly distributed circumferentially, the front end of inclined hole is open.Three jaws 10 and three inclined holes arrange correspondingly, and can slide along the incline direction of inclined hole.Each jaw 10 all has external thread section 101.Jaw 10 has the clip position of the front end that stretches out inclined hole, and the released position in retraction hole.When in clip position, the leading section of three jaws 10 is mutually close, with clamping device.When in released position, the leading section of three jaws 10 mutually away from, to instrument is unloaded.Screw 11 is set in outside three jaws 10, and is meshed with external thread section 101, can drive jaw 10 to stretch out or retraction inclined hole.Nut sleeve 7 is set in outside screw 11, is connected with screw 11 interference, can not relatively rotate.The front end of nut sleeve 7 has multiple driven members that radially extend internally 71, and the rear end of nut sleeve 7 has multiple elasticity locating detents 74 that can radially shrink and elastic pawl 72.The big opening end of described protheca 8, coordinates a lining 3, and described lining 3 is fixed in rear cover 2, and between described protheca 8 and described rear cover 2.Described steel pad 5 interference fit are arranged on drill body 1.

Described protheca 8 is set in outside drill body 1, and can rotate around the central axis of drill body 1.Protheca 8 drives and is connected with nut sleeve 7.The front end of protheca 8 has multiple driver slots 81, multiple driver slots 81 and multiple driven members 71 corresponding matching formation spline structure one by one.Driven member 71 can be moved in driver slot 81, and has primary importance 811 and the second place 812 in driver slot 81.The rear end of protheca 8 has the first groove 82 and the first projection 83 that match with elastic pawl 72, and the degree of depth of the first groove 82 is greater than described the first projection 83, the rear end of protheca 8 has the second groove 84 and the 3rd groove 85 that match with locating detent 74, and the degree of depth of the second groove 84 is same as the degree of depth of the 3rd groove 85, in the time that driven member 71 is positioned at primary importance 811, elastic pawl 72 is arranged in the first groove 82, locating detent 74 is arranged in the second groove 84, in the time that driven member 71 is positioned at the second place 812, elastic pawl 72 is positioned in the first projection 83, locating detent 74 is arranged in the 3rd groove 85, and radially inward collapsible of elastic pawl 72.

For the convenient rotation to protheca 8, on the periphery wall of protheca 8, be also provided with anti-skidding portion 86, anti-skidding portion 86 extends along the axial direction of drill body 1.

In order to facilitate the location of protheca 8, there is location jump ring 9 in protheca 8 outer setting, location jump ring 9 and drill body 1 butt.

As shown in Figure 8, screw 11 is provided with female thread portion 111, at an end face of screw 11, a circular cone inclined-plane 112 is set, and circular cone inclined-plane 112 is α with the angle of screw 11 sagittal planes.

As Fig. 4, Fig. 6, Fig. 7, Fig. 9, described retaining mechanism is between steel pad 5 and screw 11, and retaining mechanism comprises locking plate 4 and lock ball 6; Be used for preventing that jaw 10 from getting loose in the time of clip position, make jaw 10 closures more firmly with reliable.The periphery of locking plate 4 has multiple ratchets 41, and in the time that elastic pawl 72 is positioned in the first projection 83, elastic pawl 72 radially inwardly shrinks, thus with the teeth groove butt of ratchet 41.Locking plate 4 is provided with multiple through holes 43 on the end face of screw 11, and lock ball 6 is arranged in through hole 43 movingly.Through hole 43 is similar triangle through holes, the inclined-plane 42 of this through hole 43 and locking plate 4 radially have an angle β, angle β is less than 90 degree, making locking plate 4 can promote lock ball 6 moves to center position along inclined-plane 42, and the circular cone inclined-plane 112 along screw 11 moves to center position, produce the power N towards screw direction, extruding screw 11, jaw 10, prevent that jaw 10 from getting loose.

When drill chuck is in the time tightening, protheca 2 drives nut sleeve 7 forward rotation, elastic pawl 72 is positioned in the first projection 83, compressing elastic pawl 72 inwardly shrinks, and with locking plate 4 on the teeth groove butt of ratchet 41, thereby make nut sleeve 7 drive locking plate 4 rotating in same directions, promote lock ball 6 and move away from center position along inclined-plane 42, until jaw 10 stretches out and be positioned at clip position.

If there is the trend of getting loose in jaw 10 in the time of clip position, nut sleeve 7 is to rotating backward, and drive locking plate 4 rotating in same directions, lock ball 6 is moved to center position along inclined-plane 42, and move to center position along the circular cone inclined-plane 112 of screw 11, because lock ball 6 pushes the circular cone inclined-plane 112 of screw 11 all the time, this extruding force is passed to jaw 10 by screw 11, by oblique pilot hole, make jaw 10 closures tighter, play and prevent the object that gets loose.When after jaw 10 lockings, locking plate 4 cannot be rotated further.

From above description, can find out, the utility model the above embodiments have realized following technique effect: by retaining mechanism simple in structure is set, in the time that jaw is positioned at clip position and has loosening sign, locking plate, lock ball and screw in this retaining mechanism can compress jaw, to prevent that jaw from getting loose, increase the firm degree of clamping of jaw.

Claims (2)

1. a drill chuck, it comprises drill body, jaw, screw, nut sleeve, steel pad, rear cover, protheca, retaining mechanism, three jaws are arranged on respectively in three decile inclined holes of drill body, screw is arranged in the screw groove of drill body, the screw thread of screw and jaw forms thread transmission, nut sleeve is fixedly connected with screw, and protheca drives and is connected with nut sleeve, the front end of described nut sleeve has the driven member radially extending internally, and the rear end of nut sleeve has elastic pawl, the front end of protheca has the driver slot matching with driven member, driven member has primary importance and the second place in driver slot, the rear end of protheca has the first groove and the first projection that match with elastic pawl, and the degree of depth of the first groove is greater than the first projection, also there is the second groove and the 3rd groove that match with elasticity locating detent, and the degree of depth of the second groove is same as the degree of depth of the 3rd groove, in the time that driven member is positioned at primary importance, elastic pawl is arranged in the first groove, in the time that driven member is positioned at the second place, elastic pawl is positioned in the first projection, described steel pad interference fit is arranged on drill body, described retaining mechanism is between steel pad and screw, and retaining mechanism comprises locking plate and lock ball, locking plate has ratchet, in the time that elastic pawl is positioned in the first projection, the teeth groove butt of elastic pawl and ratchet, it is characterized in that: on the end face of described locking plate, be provided with multiple through holes, through hole inner headed face has an inclined-plane, lock ball arranges movingly along through hole inclined-plane, and screw arranges a circular cone inclined-plane on the end face of locking plate.

2. according to the drill chuck described in claim 1, it is characterized in that, described lock ball is arranged between steel pad and the inclined-plane of screw.