Hold-down device in apparatus for metalizing internal surfaces o

Details Hold-down device in apparatus for metalizing internal surfaces o Hold-down device in apparatus for metalizing internal surfaces o

1994-06-01

1995-10-24

Beck, Shrive

Coating processes

Solid particles or fibers applied

Interior or hollow article coating

427191, 427231, 427234, 118318, 118324, 118DIG10, 414431, B05D 722

Patent

active

054608503

ABSTRACT:
Apparatus for internally coating a pipe, comprising means heating a pipe as it is internally spray coated, a plurality of first rollers mounted on a first rotatable shaft having an inlet end proximate the heating means and an outlet end spaced from the heating means, and a plurality of second rollers mounted on a second rotatable shaft parallel to the first shaft and having an inlet end adjacent the heating means. Each second roller is spaced from and adjacent to a corresponding first roller in a paired relationship to thereby define a nesting groove located above the gap between each set of paired rollers. Motive means rotates the shafts and the mounted rollers to rotate the pipe within the nesting grooves of adjacent pairs of rollers. Advancing means longitudinally advances the pipe through the heating means and sequentially along the nesting grooves of adjacent pairs of rollers. Hold-down means is provided to maintain the hot rotating pipe within the sequence of nesting grooves adjacent the inlet end and along the inlet portion of the shafts to compensate for thermal expansion and contraction of the rotating pipe longitudinally advancing from the heating means into sequential nesting grooves of adjacent pairs of rollers, so that vibration of the advancing pipe is eliminated and a uniform internal coating is produced.

REFERENCES:
patent: 2040767 (1936-05-01), Dudley
patent: 3245824 (1966-04-01), Treat et al.
patent: 4252039 (1981-02-01), Wittler et al.
patent: 5059453 (1991-10-01), Bernsten, Jr.

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