Patent GB-190502683-A (GB)
Title: Improvements in Machinery for Bringing Metal Strips and Sheets to a Curved Form in Cross Section.
Inventor: JOHNSON GODFREY BENINGTON
Filed: 1905-02-09
Granted: 1905-10-05
Abstract: 2683. Johnson, G. B. Feb. 9. Corrugating ; bending. -Strips or sheets are corrugated, and curved longitudinally if required, for producing roofing- sheets and the like. A series of rolls is employed which effects a gradual change of sectional form, and additional rolls at the end may be set out of plane to impart the curvature required. The rolls are formed of a number of sections 1A<6>, 2A<6>,&c., 1B<6>, 2B<6>, &c., Fig. 4, splined on a circular arbor or, as shown, sliding on a polygonal arbor. Stops M determine the normal positions of the sections, and springs L tend to hold the sections against the stops. Sleeves l sliding in the recesses exclude dirt from the springs. One of the sections, in this case the centre one 7B<6>, is fixed on the arbor and acts as an abutment. The particular section which is fixed may be varied to suit the requirements of irregular work. In the case of the corrugating-rolls, the springs tend to move the sections out away from the centre, and the springs are of progressively diminishing strength from that at the centre section to allow all the sections to move along to proportionate extents when producing or deepening a corrugation. Fig. 4 shows a pair of the bending-rolls in which the arrangement of stops and springs is converse to allow for the widening of the corrugations during bending. In this case, fixed collars t have to be provided for the external abutments. Each pair of rolls has bearings sliding in guides c, Fig. 2, in the frames. The steps b<2> are adjustably supported by screws D ; distance-pieces E, bored to receive springs e to keep the steps in contact with their journals, regulate the minimum distance between the rolls, and the steps a' are yieldingly kept in position by springs and screws G. The maximum roll diameter is constant throughout the series, and the pieces E are successively smaller to diminish the distance between the axes as the corrugations deepen. The width of the roll sections is also proportionately diminished. Each arbor carries a pinion, the pinions for the upper rolls being at one side, and those for the lower at the other side, of the mill. Idle wheels running on studs on the frame gear the whole together, and a drive is effected at about the middle from a heavily flywheeled power shaft through a reducing countershaft. The idler studs at the bending end are mounted on blocks adjustable in guides by screws K, K<1>. Adjustable rollers may be mounted between the pairs of rolls to ensure the straight passage of the sheet through the mill and to prepare the edges for entry into the pass. The beading-rolls are preferably of the same section as the list of the corrugating-rolls to impart a better finish. The sheet normally contacts with the rolls only at the points of maximum diameter, thus avoiding tensile or buckling strains. In the case of irregular and non-symmetrical contours, any peripheral zones of the rolls which might have an accelerating or retarding effect may be mounted to turn idly upon the remainder of the roll sections.