Metal deforming – With use of control means energized in response to activator... – Including plural sensors or sensor responsive to comparison...
Patent
1998-04-06
1999-12-14
Larson, Lowell A.
Metal deforming
With use of control means energized in response to activator...
Including plural sensors or sensor responsive to comparison...
72392, B21C 3715
Patent
active
060002603
ABSTRACT:
An ovalizer which employs hydraulic cylinders to directly actuate duct forming members for forming round spiral duct to oval. The ovalizer includes a pair of elongated and laterally spaced-apart duct forming members sized to fit within a ductwork section and to bear against opposing interior surfaces of the ductwork section. Spaced longitudinally along and between the duct forming members are a plurality, five in the disclosed embodiment, of double-acting hydraulic cylinder assemblies for selectively forcing the duct forming members apart for forming round duct to oval, and retracting the duct forming members towards each other at the conclusion of a forming operation. A feedback control system ensures that the hydraulic cylinder assemblies extend together at approximately the same rate and stop when a predetermined extended position is reached. The ovalizer includes a plurality of signal-controlled valves, each of which is connected for controlling the application of hydraulic fluid under pressure to a corresponding one of the hydraulic cylinder assemblies for selectively causing the corresponding hydraulic cylinder assembly to extend and to retract. The feedback control system includes a plurality of position transducers connected to corresponding ones of the hydraulic cylinder assemblies. Position signals output by the transducers indicate the positions of the hydraulic cylinder assemblies. A programmed controller receives the individual position signals, and is connected to the valves for individually controlling the valves.
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International Search Report mailed Jul. 15, 1999 in PCT/US 99/06229.
Product Brochure, "The Helix-Ovalizer 36/12," Spiral-Helix, Inc., Buffalo Grove, Illinois.
Three photographs of "Ovalator" machine, believed to correspond to Goodwin U.S. Pat. No. 4,571,890.
Product Brochure, "The Compact Helix Ovalizer 24/6," Spiral-Helix, Inc., Buffalo Grove, Illinois.
Froning Mark A.
Moyers Gregory C.
Price Miller S.
Whitehead Daniel R.
Larson Lowell A.
Price Miller S.
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