Chuck for tools

A chuck for a tool, wherein a plurality of jaws are obliquely provided relative to the axis of the chuck body, a grip sleeve is provided close to the rear end portion of said chuck body in unrotatable condition relative to said chuck body, a male screw portion is formed on the outer peripheral surface of each jaw, a nut sleeve is fitted to said chuck body, a female screw portion is provided on the inner peripheral surface of said nut sleeve, and said male screw portion and said female screw portion are engaged with each other, and the rotational sleeve is engaged unrotatably to said nut sleeve and whereby said rotational sleeve is rotated to thereby advance/retract said jaws, said chuck comprising the improvment wherein said rotational sleeve is slidably provided in the axial direction;

• a plurality of circumferential concave portions are formed on the inner peripheral surface close to the front end of said rotational sleeve and a ball which is retractable/projectable by a suitable means and engageable with said circumferential concave portions are provided on the outer peripheral surface close to the front end of said chuck body to thereby constitute a positioning mechanism;
• and a serration is formed on the outer peripheral surface close to the rear end of said rotational sleeve and another serration is formed on the inner peripheral surface close to the front side of said grip sleeve and both serrations are engaging each other to thereby constitute a rotation preventing mechanism.

A chuck for a tool, wherein a plurality of jaws are obliquely provided relative to the axis of the chuck body, a grip sleeve is provided close to the rear end portion of said chuck body in unrotatable condition relative to said chuck body, a male screw portion is formed on the outer peripheral surface of each jaw, a nut sleeve is fitted to said chuck body, a female screw portion is provided on the inner peripheral surface of said nut sleeve, and said male screw portion and said female screw portion are engaged with each other, and the rotational sleeve is engaged unrotatably to said nut sleeve and whereby said rotational sleeve is rotated to thereby advance/retract said jaws, said chuck comprising the improvement wherein said rotational sleeve is slidably provided in the axial direction;

• a concave portion is provided on the inner peripheral surface close to the rear end of said rotational sleeve, a sleeve is provided close to the front side of said grip sleeve, and a convex portion which is engageable with said concave portion is provided on the outer peripheral surface of said sleeve to thereby constitute a positioning mechanism;
• and a serration is provided on the outer peripheral surface close to the rear end of said rotational sleeve, which is engageable with another serration provided on the inner peripheral surface close to the front end of said grip sleeve to constitute a rotation preventing mechanism.

A chuck for a tool, wherein a plurality of jaws are obliquely provided relative to the axis of the chuck body, a grip sleeve is provided close to the rear end portion of said chuck body in unrotatable condition relative to said chuck body, a male screw portion is formed on the outer peripheral surface of each jaw, a nut sleeve is fitted to said chuck body, a female screw portion is provided on the inner peripheral surface of said nut sleeve, and said male screw portion and said female screw portion are engaged with each other, and the rotational sleeve is engaged unrotatably to said nut sleeve and whereby said rotational sleeve is rotated to thereby advance/retract said jaws, said chuck comprising the improvement wherein said rotational sleeve is slidably provided in the axial direction;

• a concave portion is provided on the inner peripheral surface close to the rear end of said rotational sleeve, a sleeve is provided close to the front side of said grip sleeve, and a convex portion which is engageable with said concave portion is provided on the outer peripheral surface of said sleeve to thereby constitute a positioning mechanism;
• and a serration is provided on the inner peripheral surface close to the rear end of said rotational sleeve, which is engageable with another serration provided on the outer peripheral surface of the sleeve to constitute a rotational preventing mechanism.

A chuck for a tool, comprising:

• a chuck body (1, 7) having a grip sleeve (6) which is gripped by a user's hand;
• a chucking means (2) for clamping a tool;
• a rotational sleeve means (10) for transmitting a rotational force, applied by the user, to the nut sleeve (4) to advance/retract the chucking means (2), said rotational sleeve means being slidingly movable in the axial direction relative to said chuck body;
• a rotation preventing means (12, 14) for preventing said rotation of said rotational sleeve means;
• a slide restricting means (15, 17) for restricting the axial sliding movement of said rotational sleeve means.