Chuck and gripping claws for chuck

A chuck comprising:

• a chuck body capable of being attached to a spindle of a machine tool;
• a plurality of master jaws attached to the chuck body along the normal of the chuck body and formed with T-shaped grooves extending along the length thereof;
• a plurality of T nuts having tops and trunks, the tops being slidably fitted in the T-shaped grooves of the master jaws;
• a plurality of gripping claws having work holding surfaces and grooves for engagement with the trunks of the T nuts;
• and
• a plurality of claw attaching members inserted in holes in the T nuts and the gripping claws and used for attaching the gripping claws to the T nuts;
• wherein:
• the holes are formed across the T nuts and the gripping claws which are engaged with one another;
• the claw attaching members include eccentric shafts which have eccentric cams, are rotated and relatively move the T nuts and the gripping claws;
• the holes in the T nuts are provided with cam parts with which the eccentric cams of the eccentric shafts come into contact;
• and
• the eccentric shafts are provided with leaf springs which function as turn stops when tips thereof are engaged in the holes of the gripping claws.

A chuck comprising:

• a chuck body capable of being attached to a spindle of a machine tool;
• a plurality of master jaws attached to the chuck body along the normal of the chuck body and formed with T-shaped grooves extending along the length thereof;
• a plurality of T nuts having tops and trunks, the tops being slidably fitted in the T-shaped grooves of the master jaws;
• a plurality of gripping claws having work holding surfaces and grooves for engagement with the trunks of the T nuts;
• and
• a plurality of claw attaching members inserted in holes in the T nuts and the gripping claws and used for attaching the gripping claws to the T nuts;
• wherein:
• the holes are formed across the T nuts and the gripping claws which are engaged with one another;
• the claw attaching members include eccentric shafts which have eccentric cams, are rotated and relatively move the T nuts and the gripping claws;
• the holes in the T nuts are provided with cam parts with which the eccentric cams of the eccentric shafts come into contact;
• each claw attaching member comes into contact with the gripping claw at two positions;
• and
• each hole of each gripping claw has a recess on a peripheral edge thereof;
• and the claw attaching member comes into contact with the opposite edges of the recess.

A gripping claw for a chuck capable of being attached to a machine tool spindle, comprising:

• a body having a groove and a plurality of engaging holes, the groove being configured to engage with a trunk portion of a T nut provided onto the chuck, the plurality of engaging holes positioned to communicate with a plurality of holes formed in the trunk portion of the T nut and configured to receive a plurality of claw attaching members for attachment to the T nut, respectively,
• wherein:
• the claw attaching members include eccentric shafts having eccentric cams;
• the holes in the T nut into which the plurality of claw attaching members are inserted have cam parts with which the cams of the eccentric shafts come into contact in response to the rotation of the eccentric shafts;
• the gripping claw is fixedly attached to the T nut when the plurality of claw attaching members are turned and the cams of the eccentric shafts and the cam parts of the holes in the T nut are in contact with one another;
• and
• the plurality of engaging holes each has a recess and an opposite portion configured to engage with a respective one of the claw attaching members.

A chuck comprising:

• a chuck body capable of being attached to a spindle of a machine tool;
• a plurality of master jaws detachably attached to the chuck body and each having a T-shaped groove;
• a plurality of T nuts each having a top portion and a trunk portion, the top portion being slidably engaged into in the T-shaped groove, the trunk portion having a plurality of holes;
• a plurality of gripping claws each having a groove and a plurality of engaging holes, the groove being detachably engaged with the trunk portion, the plurality of engaging holes positioned to communicate with the plurality of holes in the trunk portion, respectively;
• and
• a plurality of claw attaching members slidably inserted into the plurality of holes and the plurality of engaging holes, respectively, the plurality of claw attaching members configured to engage the pluralities of T nuts and claw members, respectively,
• wherein:
• the plurality of engaging holes each have a recess on a peripheral edge thereof;
• and
• the recess has an opposite end portion configured to engage with a respective one of the plurality of claw attaching members.

A chuck comprising:

• a chuck body capable of being attached to a spindle of a machine tool;
• a plurality of master jaws detachably attached to the chuck body and each having a T-shaped groove;
• a plurality of T nuts each having a top portion and a trunk portion, the top portion being slidably engaged into in the T-shaped groove, the trunk portion having a plurality of holes;
• a plurality of gripping claws each having a groove and a plurality of engaging holes, the groove being detachably engaged with the trunk portion, the plurality of engaging holes positioned to communicate with the plurality of holes in the trunk portion, respectively;
• and
• a plurality of claw attaching members slidably inserted into the plurality of holes and the plurality of engaging holes, respectively, the plurality of claw attaching members configured to engage the pluralities of T nuts and claw members, respectively,
• wherein the plurality of claw attaching members each include a leaf spring positioned to turn stop when engaged in a respective one of the engaging holes.