Ventilation – Having inlet airway
Patent
1990-02-12
1992-01-14
Joyce, Harold
Ventilation
Having inlet airway
285 43, 454366, F24F 702
Patent
active
050800078
ABSTRACT:
A method for making seamless tilted vent comprises the spinning of a mold and a metal sheet to form a tubular member and a flat angular shackle continuously extending from and around the tubular member. The mold is made of a cylindrical member and a flat collar surrounding the cylindrical member at one end. The collar is agularly disposed relative to the cylindrical member and the metal sheet is tightened in abutting relationship against the other end of the cylindrical member. The spinning takes place about an axis corresponding to the longitudinal axis of the cylindrical member. The chasing operation of the metal against the cylindrical member is made until the metal sheet reaches the intersection of the cylindrical member with the collar to form a tubular member. The speed of the mold and of the tubular member is then set between a maximum speed not exceeding 400 RPM and short intervals of speed substantially reduced from said maximum speed. During the above sequence of speed, the metal sheet is alternatively chased until it abuts against the collar for forming the angularly disposed shackle.
REFERENCES:
patent: 506930 (1893-10-01), Nies et al.
patent: 1258884 (1918-03-01), Fife
patent: 1464406 (1923-08-01), Butler
patent: 1511884 (1924-10-01), Heppes
patent: 1615929 (1927-02-01), Buckles et al.
patent: 2277982 (1942-03-01), Hosbein
patent: 4160347 (1979-07-01), Logsdon
patent: 4386488 (1983-06-01), Gibbs
Joyce Harold
Morneau Roland L.
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