Changing and chucking tool
AssigneeHertel AG Werkzeuge & Hartstoffe
InventorFranz Glaser
Life of this patent
Estimating the term…
Abstract
An apparatus to change and chuck a tool head incorporates a chucking system that is arranged in a recess in the drive spindle that chucks a tool-head shank that can be inserted into the accommodating opening. The chucking system incorporates a grip with an axially displaceable spreader and radial guide drillings that accommodate lock balls. The tool-head shank is configured as an annular cylinder and provided with an inside annular groove on the inclined groove side wall of which locking elements, that are arranged on the grip and can be forced apart in a radial direction, outside the lock balls on the grip, interact with corresponding locking surfaces both in the locking direction and in the direction of spread.
Claims19
An apparatus for changing and chucking a tool head to the drive spindle of a machine tool, with a recess provided in the face of the drive spindle, which is coaxial with the axis of rotation of the drive spindle, to accommodate a shaft of the tool head that projects in an axial direction, and with a gripper of a chucking system that can be operated from the machine-tool side, which projects centrally from the base of the recess and that has an annular space around it within the recess formed by appropriate clearance to the inner peripheral wall of the recess, the shaft of the tool head being insertable into the annular space of the spindle recess, where it can be clamped by the chucking unit, and the gripper of the chucking unit supporting a spreader that can be moved axially in the direction of the drive spindle and through which there are radial guide drillings, within each of which there is a lock ball, it being possible to spread these apart, radially outwards by an axial pull on the spreader and which tighten the tool head thereby, wherein
- (a) the tool-head shank is configured as a tubular body, at least in its free end area, and has an inside annular groove on its inner annular surface, which, on its machine-tool side has a groove side wall that is inclined in the manner of an inside cone and subtends an acute angle that closes in the locking direction with the axis of the drive spindle,
- (b) locking elements are set in the peripheral surface of the gripper, which cannot be moved in the axial direction, but which can be forced apart in the radial direction, these elements having locking surfaces that are shaped to correspond to the inside-cone shaped groove side wall of the inside annular groove as segments of an exterior cone, and
- (c) the lock balls engage a sloped surface on the inner side of a locking element such that when the lock balls are forced apart the lock elements exert both an axial inner pressure in the locking direction and a radial inner pressure in the direction of spread on the tool-head shank.
Dependencies are inferred from the claim text.