Patent GB-1064264-A (GB)
Title: Improvements relating to tubular metal fittings
Inventor: PACKMAN PERCIVAL JAMES
IPC: B21D1/00
Filed: 1964-06-16
Abstract: 1,064,264. Rolling. PACKMAN RESEARCH Ltd., and GASCOIGNES (KEE KLAMPS) Ltd. Sept. 15, 1965 [June 16, 1964], No. 24940/64. Heading B3M. [Also in Division F2] The bore (2) of a malleable iron fitting (1), Fig. 1 (not shown), is cleaned up and/or trued by a rotary roller head, comprising a tapered mandrel (3), Fig. 2 (not shown), surrounded by oppositely tapered rollers (4) carried in a cage (5). The mandrel is movable axially to thus allow the rollers to move inwardly under the control of a spring (9), and is formed with four equally spaced flat regions to allow it to be inserted or withdrawn through the rollers. A driving member (12) has a dog (13) which engages fitting (1), and member (12) is driven by a shaft (19), through a clutch (18), sprockets (17), (15), and a chain (16). Shaft (8) is driven by a sprocket (28), and a gear (21) on the shaft meshes with a gear (20) which drives shaft (19), the gear (20) being held between a disc (22), and spring-urged ring (23), forming a slipping clutch. The gearing ratios are selected so that driving member (12) rotates slightly more slowly than the fitting (1) driven by the rollers 4. Sprocket (28) is driven by an electric motor (35), Fig. 4 (not shown), through a belt drive (34), a gear-box (33), and a chain drive (32), (31), (36). A cam-shaft (38) is driven by a second electric motor (37) through a chain drive (39), and carries a cam (40) for controlling the timing of the operation, and a second cam (41) having a track (42) which controls the vertical movement of shaft (8). A lever (45) is pivoted at (46) and has an arm (60) connected to a lever (61), which is connected to a second lever (62) by a link (63), the levers controlling the motors (35) and (37). A cam follower (69) is carried by arm (60) and cooperates with cam (40). A second cam follower (75) co-operates with the track (42) of cam (41), and is carried by one arm (76) of a bell-crank lever, which is pivoted at (46), and has a second arm (77) fitted with a roller (78). Roller (78) is seated in a V-block (79), which is connected by a compression spring (80) to a block (81) forming part of an assembly (82), also pivoted at (46). An arm (84) of assembly (82) is located between discs (85) on shaft (8). Lever (45) is acted upon by a sliding rod (47), which in turn is acted upon by a projection (53), on a movable guard (48), which guard serves to enclose the roller head. Guard (48) pivots about point (49), and has a handle (52) which enables it to be closed against the action of a spring (51). To release the mandrel if it becomes jammed, the mandrel is turned by a hand wheel (90), which has a dog clutch (91) connected to gear-box (33). In operation, guard (48) is closed by handle (52), and is held in the closed position when projection (53) is engaged, by a spring lock member (54). Rod (47) is moved axially to pivot lever (45), so that arm (60) operates levers (61), (62), and the motors (35), (37) are actuated. Cam follower (69), and therefore arm (60), are held in the raised position to maintain the drive, until cam (40) has made one revolution, whereupon follower (69) drops into a recess (70) on the cam, arm (60) drops, the motors stop, and rod (47) releases the guard (48). During this time follower (75) co-operates with cam track (42), so that arm (84) of assembly (82) raises mandrel (3) at the start of the operation so as to expand the roller head, and lowers the mandrel to contract the head at the end of the operation.