Improvements in frictional bodies for clutches and the like and in the method of making the same
267,961. Kirchbach'sche Werke Kirchbach &. Co. March 17, 1926, [Convention date]. Cone and disc. - The frictional elements of clutches, brakes, &c. are made by applying plastic friction material in large masses to perforated annular carrier discs and forcing it into the pertorations. A steel disc 2, Fig. 1, is provided with circular or other holes 1. which may be undercut, and the material 3, consisting of fibres, such as asbestos, cotton, hemp, brass wires, or any mixtures thereof, or, a wover fabric, bonded by "Bakelite," synthetic resin, or other binding-agent, is applied in a continuous layer to each side of the disc, the two layers being united at the perforations by pressure, The facings are hardened under pressure by heat, and are then ground. The Specification as open to inspection under Sect. 91 (3) (a) comprises also a modification, in which separate sector-shaped pieces 14, 14a, Figs. 4 and 7 (Cancelled), are so applied to both sides of an annular disc 11 as to form practically coutinuous surfaces. The disc 11 has groups of round-edged holes 12, 13, the larger central hole 13 of each group receiving a long projection 16 on the piece 14, while the holes 12 receive short projections 15, 15<a> on the pieces 14, 14<a> respectively. Under pressure, the projections 15, 15<a> are united midway in the holes 12, the projection 16 being received in a bore of the piece 14a. Before application of the facings, they and the carrier disc are preferably coated with the binding-agent. Instead of passing to the middle of the thickness of the disc, the projections 15, 15<a> may alternately pass completely through the disc. This subject-matter does not appear in the Specification as accepted.