GB250979A - Tube expanding machine - Google Patents

Abstract

250,979. Slesazeck & Co., Ges., (Assignees of Slesazeck, C.). April 17, 1925, [Convention date]. Tube expanders.-In a, roller-head tool for expanding tubes of the type in which the rollers are pressed outwards by an axially-movable screw-threaded tapered mandrel engaging a sleeve nut which is moved axially against the pressure of a spring when the resistance attains a certain degree, a clutch is provided between the sleeve nut and the head or casing thereof, consisting of tapered pins which pass over one another when a predetermined resistance is reached. The roller head c is screwed into one end of a casing a provided at its other end with a screwed ring v. The mandrel d has a screwthreaded portion e engaging the screwed end of a sleeve f which is pressed forward by a spring i. Flanges on the ends of the roller head and sleeve are provided with one or more tapered pins o, p so as normally to rotate the sleeve at the speed of the roller head and feed the mandrel axially. When the resistance reaches a predetermined amount the sleeve slides back and the pins are disengaged, so stopping the expanding operation. In a modification, a reversely tapered mandrel w, Fig. 3, is used, and the pins n, q are respectively carried by the screwed sleeve t and the screwed ring u, the spring i being mounted between the sleeve and the roller head c. The thread of the mandrel may be of opposite hand to that of the first form or may be rotated in the opposite direction. In a further modification the ring u may be replaced by an internally screwed cap.