GB378363A - Improvements in automatic de-clutching devices for the feed mechanism of drilling machines - Google Patents

Abstract

378,363. Drilling-machines. SCHOENING, H., 23, Franziskanerweg, Frohnau, Berlin.-(Assignee of Raboma Maschinenfabrik, H. Schoening; 51, Spandauerstrasse, Borsigwalde, Berlin.) April 11, 1932, No. 10325. Convention date, April 24, 1931. [Class 83 (iii).] A declutching device for the feed of a drilling machine comprises a series of separately rotatable rings with abutments arranged to come into operation in succession, the feed shaft rotating the first ring which then rotates the second and so on, the last ring actuating a declutching member. A shaft b carries a pinion 2 meshing with a rack on the drill holder 1b so as to feed the drill. A worm d mounted on a shaft 3 drives a worm wheel c rotatablv mounted on the shaft b and fixed to one member f of a clutch, the other member g of which is slidably splined to the shaft b and is operated by levers i, i1. The member g has a lug n projecting into a circular channel in a driving ring o rotatably mounted on the shaft ; this lug n engages a member p carried by the ring o so as to rotate the latter. The member p then engages a boss s on a lug t carried by a second driving ring r also rotatably mounted on the shaft b. The lug t is thus rotated into engagement with an arm u mounted on a shaft v which carries a cam w; this cam actuates a clutch z1 on the shaft 3 so as to discontinue the feed. The cam w is so shaped that it will operate when the shaft b is rotated in either direction. A ring k rotatably mounted on the clutch member g can be fixed thereto by a pin l, and carries a pin m which will actuate the declutching member u when the shaft b has completed a desired fraction of a revolution. A spring u1 maintains the arm u in its normal inoperative position.