437297-A is referenced by 1 patents.
437,297. Expansion sockets. PHILLIPS, N., Karachi, Upton Road, Bexleyheath, Kent. April 27, 1934, No. 12770. Addition to 367,547. [Class 89 (i)] In a wall expansion socket as described in the parent Specification, the expansible member 3 is provided with longitudinal slits 4 to facilitate its expansion. The member is also provided with recesses 9 for the reception of an angled bolt head. On tightening the bolt the angles bite into the walls of the recess and prevent the socket 3 from turning.