GB164350A - Improvements in chucks - Google Patents

Abstract

164,350. Breitenbach, K. June 7, 1921. Chucks.-In bevel closing chucks of the type in which the jaws are actuated by an axially movable bevelled member, detachable connecting pieces are provided between the jaws and the actuating member. Jaws 2, Figs. 1 and 2, have ribs radially guided in grooves 18, 19 in a chuck body 1 mounted on a member 12 adapted to be secured to the machine spindle, and inclined rear faces 2 coacting with corresponding faces provided on a member 4 keyed at 8 to the chuck body and moved axially by means of a nut 7. The latter is secured against axial movement by a ring 10. The inclined faces on the member 4 may consist of detachable dovetail members 6 having projecting ribs engaging grooves 16 in the jaws so that the latter are positively actuated in both directions. In a modification, Fig. 3, each jaw has two converging inclined faces and the members 4 having right and left-handed threads are simultaneously moved in opposite directions by rotation of the nut 7. In a further modification the member 6 consists of a strip of rectangular section and the jaws are retained in the member 4 by 'means of tongues sliding in grooves formed in the sides of the jaws. A number of further methods of securing the jaws to the axially-moving member 4 are described. The Specification, as open to inspection under Sect. 91 (3) (a), comprises also a modification, Fig. 19 (Cancelled), adapted for internal chucking, a threaded centrally-disposed member 4 being moved axially by a nut 7 actuated by bevel gearing 40. The gripping surfaces of the jaws are of thread formation so that any slipping which may be caused by the pressure of the tool tends to draw the work against the chuck body. A further modification is adapted for use either as an internal or external chuck. Various methods of actuating the member 4 controlling the jaws are also described. This subject-matter does not appear in the Specification as accepted,