Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Rod or tubular preform
Patent
1981-07-17
1983-06-14
Thurlow, Jeffery R.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Rod or tubular preform
264566, 4253261, 425445, B29D 722
Patent
active
043880614
ABSTRACT:
A guide assembly for blown plastic tubes to guide and support the tube after its extrusion from a die consists of a frame carrying a plurality of pairs of vertically-extending members distributed circumferentially around the tube. Each of the vertically-extending members carries a plurality of vertically-spaced parallel radially-inwardly-extending arms. Each arm of one vertical member of the pair cooperates with a respective arm of the other member of the pair, each cooperating pair of arms having a flexible wire support member extending between these ends, the wire engaging the tube and conforming to its circumference. As the tube diameter decreases the arms are moved simultaneously radially inward by opposite rotation of the respective vertical members, whereupon the wire conforms to the new reduced diameter, and vice-versa. The actual contact of the support member with the tube is by side-by-side cylindrical rollers (e.g. of nylon) threaded on the wire. An additional support means may be provided that engages the center of the guide wire and, in addition to preventing downward sagging, automatically presses it radially inward with an increasing force as the tube diameter is decreased.
REFERENCES:
patent: 3223762 (1965-12-01), Fry, Jr.
patent: 3417434 (1968-12-01), Hafner
patent: 3522630 (1970-08-01), Swickard, Jr.
patent: 3596321 (1971-08-01), Upmeier
patent: 3749540 (1973-07-01), Upmeier
patent: 3930781 (1976-01-01), Upmeier
patent: 3958913 (1976-05-01), Stangl
patent: 3980418 (1976-09-01), Schott, Jr.
Macro Engineering Company Ltd.
Thurlow Jeffery R.
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