Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Patent
1990-03-21
1991-11-19
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
264339, 425340, 425384, 425392, 425402, B29C 5308, B29C 5384
Patent
active
050662120
ABSTRACT:
An apparatus engages pre-cut lengths of heated thermoplastic pipe against a pair of eccentric wiper arms bending the pipes into elbows. The eccentric wiper arms have an eccentric portion and a constant radius portion. A bending form has an arcuate die adapted to hold a pre-cut length of pipe. Four such bending forms are radially connected to a rotation shaft which is journalled at each end to a support frame. A continuous supply of pre-cut lengths of pipe are transported through a heating chamber by a set of endless chains. Each pipe is then transferred to a bending form which is rotated by the shaft so that the cold end portions of each pipe engages the spaced apart and substantially parallel eccentric wiper arms. The wiper arms urge the end portion of each pipe length slightly beyond the outer edges of each arcuate die to compensate for the effect cooling has on each pipe length. Once the pipe is bent, the rotation of the bending form causes the pipe to drop into a tank of water. A pump circulates cooled water through the tank so that water is maintained at approximately 40.degree. Fahrenheit. When water is pumped into the tank enough water flow is created to urge the elbows toward a conveyor belt. Another pump creates water flow that urges the elbows onto the conveyor belt which removes the elbows from the tank and drops them in a storage bin.
REFERENCES:
patent: 3861847 (1975-01-01), Barnett
patent: 3884612 (1975-05-01), Parmann
patent: 3890079 (1975-06-01), Slater
patent: 4156588 (1979-05-01), Miller et al.
patent: 4160067 (1979-07-01), Patzner et al.
Mackey James P.
Midwest Plastic Fabricators
Woo Jay H.
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