GB722768A - Electromagnetically operated friction clutch - Google Patents

Abstract

722,768. Friction clutches. RYBA, A., REINISCH, J., and VINATZER, E. Oct. 17, 1952 [Oct. 17, 1951], No. 26090/52. Class 80 (2). An electromagneticallyoperated friction clutch comprises relatively rotatable members 4, 14, the former being the core and the latter the armature of the electromagnet and the core carrying fixedly two hardened magnetizable rings 20, 21 having abrasive surfaces, such as are provided on files or milling tools, abutting against the armature of relatively soft ferro-magnetic material, which can be worn away by the abrasive surfaces as the gap between the armature and core when the clutch is engaged decreases, the extent of this gap being determined by the thickness of the friction means coupling the two relatively rotatable members, e.g. the friction discs 10, 11 and decreasing with wear of these means.-In a modification. Fig. 3 (not shown) the multiple friction discs 10, 11 are replaced by two single discs, secured to the members 4, 14 respectively. As further modifications, the rings 20, 21 may be fixed to the armature instead of to the core, or the file-like surfaces may be formed directly on the armature or core or on members welded thereto. Reference has been directed by the Comptroller to Specification 556,182.