Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Rod or tubular preform
Patent
1994-12-01
1997-01-14
Warden, Jill
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Rod or tubular preform
425384, 425150, 425327, 72 48, 723426, 72369, 72375, 72381, B28B 2178, B28B 2198, B21D 716, B21D 7022
Patent
active
055937080
ABSTRACT:
A bending process including both preliminary and following steps takes place in one apparatus. A plastic pipe (6) is heated to a temperature in which it can be plastically deformed. The heated pipe is thereafter shoved into a pipe-shaped bending channel (27) of a bending tool, with the bending tool comprising two dies (9,10), each respectively defining a groove (14,13) which together form the bending channel. Finally, a cooling agent is allowed to flow through the bent pipe which is still in the bending tool. The thusly cooled pipe is removed from the bending tool after the dies are separated from one another. The apparatus to bend the plastic pipe comprises heating, bending, and cooling stations (1,2,3). The heating station comprises two heating fixtures, and the cooling station comprises a supply line (21,22) with a coupling joint (20) which can be coupled to an end of the pipe.
REFERENCES:
patent: 3753635 (1973-08-01), Barnett
patent: 4747768 (1988-05-01), Crupi
patent: 4809188 (1989-02-01), Willitis et al.
patent: 4947666 (1990-08-01), Hametner et al.
patent: 5407613 (1995-04-01), Schulte
Dawson E. Leigh
Warden Jill
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