Abstract:
A rotary on-the-fly tooling system including: opposed and synchronised counter-rotating tool assemblies (12, 14) for receiving a workpiece (10) having a direction of travel therebetween during a tooling operation: each counter-rotating tool assembly including (a) at least two co-rotating crank arms (16, 18) of equal length, each crank arm having proximal and distal ends, the proximal ends rotating about a pair of crank axes spaced from, and spaced along, the direction of travel of the workpiece, and (b) a tool mounting portion (24), the distal ends of the crank arms being pivotably mounted to the tool mounting portion at locations spaced along the direction of travel of the workpiece such that the tool mounting portion remains in the same orientation relative to the direction of travel of the workpiece at least during the tooling operation.
Abstract:
A method of forming a tube involves the punching of tabs (18) from an overlapping longitudinal seam (12) and folding the tabs (18) to mechanically fix the opposed lateral edges of the sheet material forming the tube (10).
Abstract:
A method of improving the shear strength of a bolted joint involves pressing bosses (14) in planar members (10, 18) and abutting the planar members front to rear (figure 3) such that the bosses closely nest one within the other to thereby restrain the members against relative planar movement.
Abstract:
A truss (10) for a roof having an attic space or the like, the truss including: a substantially vertical web (15, 16) adapted to constitute a stud for supporting the attic wall; a substantially horizontal web (14) adapted to constitute a support for the attic ceiling or ceiling battens, and a bottom chord (11) adapted to constitute a bearer or joist for the attic floor.
Abstract:
A truss-purlin assembly includes opposed tabs (22) punched out of the upper chord (12) of a roof truss (10) which receive flanges (24) of a roof purlin (18). The flanges (24) can be resiliently deflected in the direction of arrows (28) during assembly of the roof purlin (18) with upper chord (12). The flanges (24) include corrugations (26) which prevent longitudinal movement of the roof purlin (18) relative to the upper chord (12). The invention is also equally applicable to a truss-batten assembly.