| 摘要 |
A carriage 40 is mounted alongside a stationary support 30 and, is movable substantially parallel to the support 30 with a substantially flat sliding surface of the carriage 40 moving across a substantially flat support surface 31 of the support 30. The support 30 and the carriage 40 have respective clamps 50 for holding respective edge margins 24, 25 of a radial slot of a flat circular disc 20, having a central bore, which is to be shaped into a helical flight segment 120. The edge margin 24 clamped in carriage 40 is displaced relative to the edge margin 25 clamped in support 30 upon movement of the carriage 40 relative to support surface 31, to deform the disc 20 to a single pitch helical form. In other versions. The stationary support may be replaced by a second movable carriage, the respective carriages (144,146, Figure 12) then being relatively movable along close parallel paths. These carriages are slidably mounted on a stationary support which may be a base or a frame (100). Finished flight segments may be used to form helical piles, augers and screw conveyors |
