GB315758A - Metallic tubes or shafts and process of producing the same - Google Patents

Abstract

315,758. Metallic Shaft Co., (Assignees of Lard, A. E.). July 17, 1928, [Convention date]. Tubes, games, appliances for. - A metallic tube, particularly for use as a shaft for a golf club &c. comprises two tubular walls of thin metal, one within the other and continuous with each other at both sides of an open seam extending longitudinally of the shaft. The shaft may be made by bending a rectangular or longitudinally tapering metal sheet between dies 34, 30, Fig. 2, completing the bend by hinged dies 31, 32 so that the edges of the sheet overlap, interfitting the overlapping edges and then brazing the joint so formed by an applied copper alloy strip secured in place by asbestos tape and annealed steel wire and heated in a hydrogen atmosphere furnace. A lead filling 41, Fig. 9, is then placed in the tube and the latter pressed to conform to the filling. The work g, Fig. 12, with the filling in position is now bent into circular form round a mandrel 46, and, after removal of the mandrel, the tube is rolled between spiral reversing rolls 50, 51, Fig. 16, to close the open seam. The lead filling is then melted out. A seamless tube may be used instead of one made from sheet metal. If desired, spot welding may be substituted for the brazing and the jointing may be effected after the tube has been reduced to a crescent section. When cylindrical shafts are made, a steel filling may be used at the stage when the circular tube is reduced to one of troughlike form. The metal used for the shaft may be high or low carbon steels, molybdenum-steel or the metal sold under the registered Trade Mark " Duralumin." Numerical data of the dimensions of a specimen shaft at various stages of manufacture are given in the Specification. Specification 208,553, [Class 132 (ii), Games], is referred to.