Patent GB-805238-A (GB)
Title: Improvements in or relating to earthenware conduits and their manufacture
Inventor: SMITH OSCAR HARRIS
IPC: B28B21/96
Filed: 1956-09-11
Abstract: 805,238. Conduits. HEPWORTH IRON CO. Ltd. Sept. 5, 1957 [Sept. 11, 1956], No. 27705/56. Class 33. An earthenware, conduit is provided round the external surface of its spigot-end and/or round the internal surface of its socket-end with two or more rows of peripheral depressions. Apparatus for their provision comprises a roller with rings of peripheral projections, means for advancing the roller to press its projections into the conduit, means for traversing the conduit in so doing, means to rotate the roller also, and means for its withdrawal after at least one peripheral movement. The rotation of the roller may result from the driving contact effected by the projections being pressed into the conduit. In said apparatus a roller 49 with projections 50 is rotatably mounted on a spindle 48 bolted to a lever 47 with a pivot 46 and having an arm 51 interacting with a plate 30 (screwed to an end of the sleeve 17,) through an adjustable headed screw 53 upon advancing a finishing head 10 having blades 40, 42 for removing the spigot surface as at 41 and for radius cutting the inside edge 43, respectively, The head 10 is on a rotated shaft 11 driven through a key 12 connected to a pulley 13 having a double belt 14 to slide a distance X. The sleeve 17 is thus rotated and because of a pin 18 in a slot 19 in the shaft 11 the sleeve 17 can move axially a distance Y thereon against a compressed spring 20. The sleeve 17 moves on bearings 23, 24 in a sleeve 25 sliding axially in a liner 26 in the casing extension 27, a sleeve projection 28 being externally moved. The shaft 11 passes through the plate 30, a guard 32 being screwed to the extension 27. The pulley 13 has an integral pulley 35 which drives a trimming mechanism. Because of the rotation of the head 10 and parts thereon the tools 49 are held in the inoperative position and clear of the conduit by centrifugal force, Fig. 1, before advance of the head 10 by moving shaft 11 the distance X to engage spigot-end 37 with flange 45. After at least one revolution, when the blades 40, 42 will have acted, and the spigot-end 37 is engaged by the flange 45, the sleeves advance the distance Y. Plate 30 thus advances to rock the lever 47 so that the projections 50 of the roller 49 press as it rolls over the spigot surface, and three rows of depressions are formed. After the roller has passed in driving contact at least once round the spigot-end 37, the plate 30 is moved in a reverse direction the distance Y. The lever 47 is rocked so that the projections 50 come out of contact with the spigot. When the reverse movement is increased by the distance X, the head becomes inoperative. Simultaneously with the external formation of the depressions in the spigot-end 37, depressions may be formed in the inside of the socket-end of the conduit 38 by a modified head in a similar manner. The depressions may be provided at one end only, the other end then having undercut grooving as described in Specification 805,237. According to the Provisional Specification the roller may be positively driven.