Device for facilitating the bending and forming of plastic pipe

Details Device for facilitating the bending and forming of plastic pipe Device for facilitating the bending and forming of plastic pipe

1976-07-08

1977-12-27

Larson, Lowell A.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Including both heating and cooling means

425393, 219 66, B29C 1706

Patent

active

040652424

ABSTRACT:
An apparatus for facilitating the bending and forming of plastic pipe or other devices is provided which includes an elastomer boot capable of expansion and contracting between a first diameter and a second diameter. The first diameter boot size permits boot insertion into the plastic pipe. The boot preferably is a tubular structure having a closed first end. An adapter is mounted along the second end of the boot, which seals the boot to fluid flow, except through the adapter. The adapter has an axial opening extending through it, which preferably is used to attach a coaxial conduit means to the boot. After insertion in the pipe, the boot is expanded to its second diameter size, that size conforming to the internal diameter of the pipe. Means for heating the pipe to bending or forming temperature through the boot also is provided. After reaching bending temperature, the pipe is bent to the desired shape. Thereafter, the pipe is cooled by circulating fluid through the boot by way of the conduit means. The conduit means, in one embodiment, is operatively connected to a hot or cold fluid supply through suitable control means. After the pipe cools and sets, the boot is returned to its first diameter size and removed.

REFERENCES:
patent: 2127466 (1938-08-01), Reichel et al.
patent: 3279237 (1966-10-01), Rader
patent: 3290728 (1966-12-01), Pratt
patent: 3360826 (1968-01-01), Lorang
patent: 3922134 (1975-11-01), Kupfrian
patent: 3955908 (1976-05-01), Farrell

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