CN2882858Y - Chuck - Google Patents

Abstract

A clamping chuck (1) is provided, which has two column-shaped graduation claws (4 and 5). The two graduation claws (4 and 5) form a V-shaped passage (6) outside; the V-shaped passage (6) has a depth that changes along the longitudinal direction on the surface of the claw, so as to clamp the cutter with quadrangle screw tap end of variable dimension; the graduation claws (4 and 5) can be positioned into a block (11 and 12) by revolving; the block (11 and 12) is positioned in a stand by sliding; the stand is formed by passing through the clamping chuck along the direction of diameter; a dual-thread screw stem (15) is positioned in the chuck and can rotate freely; the dual-thread screw stem is engaged with the block (11 and 12); the block can be adjusted once the dual-thread screw stem (15) revolves along the direction opposite to the chuck center (C). In the utility model, with the adoption of a column-shaped adjusting screw tap (17) that can rotate eccentrically, the dual-thread screw stem (15) can be adjusted along the axial direction, so as to pointing the block and the claw to the chuck center (C); the screw tap (17) is positioned in a radial groove (16); the radial groove (16) extends around the central part of the dual-thread screw stem (15).

Description

Expansion chuck

Technical field

The utility model relates to a kind of improvement of expansion chuck, and this expansion chuck has two rotating calibration claws, and two calibration claws externally are formed with the V-arrangement passage, and the V-arrangement passage can change the degree of depth, has the cutter of variable-sized quadrangle screw tap end with clamping.

Background technology

This chuck that relates to can be known from EP0803305.Corresponding chuck has shown known chuck with profilograph and end-view respectively as shown in Figure 1.Two columniform claws 4 and 5 form V-arrangement passages 6, and V-arrangement passage 6 longitudinally has the degree of depth of variation in each jaw surface.Claw can turn to a certain position, and in this position, claw is by the relative side braking of the V-arrangement passage with respective depth that faces one another from the center of passing chuck.By spring bias ball 7 and 8 claw is clamped in the appropriate location, and snap-in advances in the corresponding seat, described seat is formed on the claw.Claw can be against the power rotation of spring 9 and 10, and claw is in case rotation will force ball to come out in their seat.Each claw all is contained in piece 11 and 12, and they are controlled and slide in chuck head 3, and chuck head 3 is formed on the front end of chuck, and a relative end of chuck is used for chuck is installed on the axle.Slide block can be regulated along the direction opposite with respect to chuck hub.Two-flight screw 15 and slide block engagement, described screw rod in case rotation will towards or leave chuck hub and drive slide block with reciprocal direction.Two-flight screw is positioned at chuck head freely to rotate.The center support of two-flight screw has radially outstanding flange 15 ', and it is received by the seated connection that is formed in the chuck head, by this way two-flight screw is fixed, and is non-adjustable along its axial direction.

This chuck is suitable for the rotary cutter that clamping has quadrangle screw tap end, is typically screw tool.In screw chasing, the same with other similar process operations, wherein use rotary cutter, perhaps workpiece rotates with respect to cutter, and any off-centre of cutter holding device all can cause radially pitch on cutter, must avoid this off-centre as common problem.

Goal of the invention

The purpose of this utility model provides a kind of expansion chuck of the above-mentioned type, and it holds at tool-holder and improves aspect the centering of pawl.This purpose is to realize by the expansion chuck that claims are put down in writing.

Summary of the invention

According to the utility model, in aforesaid expansion chuck basically, place slide block and claw in order to aim at chuck hub, two-flight screw axially is being adjustable, thereby causes chuck hub and fabulous centering between the center of the cutter that clamps between the claw.

For this reason, two-flight screw is formed with radial slot, and radial slot extends around the core of screw rod.Round tap is fastened in this groove, and two-flight screw is by this way by the round tap axial support.Screw tap is formed on an end of pivot pin, and this pivot pin is positioned at chuck head, and rotatable, preferably can be around the axle rotation that overlaps with the central shaft of chuck.Round tap has the radius littler than the radius of pivot pin, its eccentric location, end at pivot pin.Pivot pin is rotation in a single day, and round tap just around the chuck hub eccentric motion, comes along each direction axial adjustment two-flight screw by this way.It is effectively that limit screw is fixed on the appropriate location with pivot pin, in this position, by this axial adjustment of two-flight screw, aims at placement slide block and claw with chuck hub.

Description of drawings

With reference to the accompanying drawings, below the utility model is carried out more detailed description.In the drawings,

Fig. 1 has shown a kind of chuck of prior art, and its details sees Foreword;

Fig. 2 is by the vertical section according to chuck of the present utility model, comprises two-flight screw, but this two-flight screw axial adjustment;

Fig. 3 is the top view than small scale of the chuck of Fig. 2;

Fig. 4 is the end-view of Fig. 2, also than small scale (demonstration be to have removed header board); With

Fig. 5 is the perspective view according to adjusting screw tap of the present utility model.

The specific embodiment

With reference to figure 2-4, expansion chuck 1 of the present utility model comprises rotationally symmetric body basically, and rear end 2 is suitable for being engaged on the rotating shaft of lathe for example.Chuck is formed on relative front end, and chuck has chuck head 3, and chuck head 3 is provided for clamping the cutter with variable-sized quadrangle screw tap end.For this reason, two columniform claws 4 and 5 are formed with V-arrangement passage 6, and V-arrangement passage 6 has the degree of depth that longitudinally changes in the surface of each claw.The number could vary of V-arrangement passage 6, preferably, the passage of four different depths is opened around the circumference equally-spaced of each circular claw 4 and 5 respectively.Claw can turn to a certain position, and wherein, two claws are by the relative side locking of the V-arrangement passage with respective depth that faces one another from the center C of passing chuck.By spring bias ball 7 and 8 claw is locked in the appropriate location, and snap-in advances in the corresponding seat, seat is formed on the claw outside.Claw can rotate against the power of spring 9 and 10, and claw is in case rotation will force ball to come out in their seat.Each claw is contained in respectively in the cylindrical seat that is formed in block element 11 and 12.Block element 11 and 12 is positioned at chuck head, and block element is along the mutual reverse slide of the diameter of chuck head.Slide block 11 and 12 is received by corresponding seated connection, and seat forms the part of succeeding vat, and this groove extends through chuck head along diametric(al).Shoulder structure in the rear structure of slide block rear end and the groove engages, by this way along the fixing slide block of the axial direction of expansion chuck.The header board 13 that has central opening 14 is connected on the front of chuck head, claw 4 and 5 is fixed in their seats in slide block 11 and 12.

Slide block 11 and 12 can be regulated along the direction opposite with respect to chuck hub C.Two-flight screw 15 and slide block engagement, described screw rod in case along a direction rotation will be simultaneously towards or leave chuck hub and drive slide block along reciprocal direction.That two-flight screw 15 inserts is level and smooth, in the semi-cylindrical seat, freely to rotate in chuck head, simultaneously, mesh with semicircle screw thread in the formation of the rear end of each slide block 11 and 12.

According to the utility model, place slide block 11,12 and claw 4,5 in order to aim at chuck hub, two-flight screw 15 is axially adjustable, promptly adjustable on the longitudinal axis transverse to chuck.For this reason, two-flight screw is formed with radial slot 16, and radial slot 16 extends around the core of screw rod.Regulate pin and comprise cylindrical screw tap 17, this screw tap 17 is fastened in this groove, and two-flight screw is in this way just by cylindrical screw tap 17 axial support.Screw tap is formed on an end of cylindrical pivot pin 18, and this pivot pin 18 is positioned at chuck body, and can be around a rotation, and this preferably overlaps with the central shaft C of chuck.Perhaps, pivot pin also can be positioned at chuck body with around a rotation, and this extends on the section by two-flight screw, and described overlaps with chuck hub axle C.Like this, the pivot pin axle is preferably crossing respectively with the central shaft of chuck and two-flight screw simultaneously.

Cylindrical screw tap 17 has the radius littler than the radius of pivot pin 18, and it is in the end of pivot pin off-centre (eccentric outstanding) location, as shown in Figure 5.Pivot pin is in case rotation, and round tap is just around the chuck hub eccentric motion, thereby comes by this way along each direction axial adjustment two-flight screw.Aim at when placing by the axial adjustment of two-flight screw when slide block and claw and chuck hub, the limit screw 19 that passes the expansion chuck body by screw thread just can be fixed on pivot pin its position effectively.In preferred embodiment, pivot pin is positioned at the center of chuck body, can be in the rear end of chuck body via the passage 20 that is installed in the rear end, by inserting collet head spanner or general utility wrench, arrive rotation and the adjusting of pivot pin to carry out two-flight screw 15, collet head spanner or general utility wrench engage with the corresponding shape of pivot pin rear end.

Claims (5)

1, a kind of expansion chuck, have two columniform calibration claws (4,5), two calibration claws (4,5) externally are formed with V-arrangement passage (6), V-arrangement passage (6) has the degree of depth that longitudinally changes in jaw surface, the cutter that has variable-sized quadrangle screw tap end with clamping, described claw (4,5) rotatably is positioned at piece (11,12), and piece (11,12) is slidingly received in the seat, and described seat passes expansion chuck and forms along diametric(al); And two-flight screw (15), it is positioned at chuck and can rotates freely, simultaneously with piece (11,12) screw-threaded engagement, two-flight screw (15) is in case along the direction rotation opposite with respect to chuck hub (C), will regulating block, it is characterized in that: by adjusting screw tap eccentric rotation, columniform (17), two-flight screw (15) is axially adjustable, so that piece and claw are aimed at chuck hub (C), screw tap (17) is fixed in the radial slot (16), and radial slot (16) extends around two-flight screw (15) at the core of two-flight screw (15).

2, expansion chuck as claimed in claim 1 is characterized in that, adjusting screw tap (17) has the little radius of radius than columniform pivot pin (18), and screw tap is outstanding prejudicially from an end of pivot pin.

3, expansion chuck as claimed in claim 2 is characterized in that, pivot pin (18) is positioned at the expansion chuck body, and the central shaft of pivot pin overlaps with the central shaft of expansion chuck (C).

4, expansion chuck as claimed in claim 2 is characterized in that, pivot pin (18) is positioned at the expansion chuck body, and the central shaft of pivot pin extends on the section by two-flight screw (15), and described section overlaps with chuck hub axle (C).

5, expansion chuck as claimed in claim 3 is characterized in that, pivot pin (18) is positioned at the center of expansion chuck body, can arrive pivot pin via passage (20) from the rear end of chuck body, to carry out the axial adjustment of two-flight screw (15).