GB1481712A - Methods and apparatus for bending tubes - Google Patents

Abstract

1481712 Tube bending; embossing G O RULE & SON Ltd 19 Feb 1976 [23 Nov 1974 6 Aug 1975] 50854/74 and 32773/75 Headings B3E B3A and B3Q A tube is bent by forming two opposed outwardly facing and inwardly extending depressions 30 (one shown in Fig. 3) in the tube wall, then deforming the tube wall inwardly, as at 40, transversely of the tube axis and in a plane containing the two depressions. Thereafter the tube is bent as in Fig. 4, and welded at 45. The depressions and deformation may be carried out on the fly-press of Fig. 1, the tube being laid between abutments 13 and 14 over a conical projection 19 beneath a conical projection 21a on the press tool head 20, so that the first stroke of the press forms the depression 30, the tube then being laid between abutments 14, 15 for formation of the depression by wedgesection tool 22. Alternative apparatus is shown in Fig. 6, where the tube is laid between guides 112, 113 between opposed projections 120 on on levers 115 movable about pivots 116 by pneumatic cylinder 118 in response to actuation of an operators' button or pedal (not shown), to form the depressions 30. Completion of this is detected by a sensor 141, causing actuation of pneumatic cylinder 132 to operate deforming tool 125. Completion of this is detected by sensor 143 which resets the apparatus. An emergency button can be used to raise tool 125 and open levers 115 at any time.