Pipes and tubular conduits – Reinforced
Patent
1979-05-29
1981-02-10
Bryant, III, James E.
Pipes and tubular conduits
Reinforced
138149, 138178, 138DIG4, 248354P, F16L 904
Patent
active
042495784
ABSTRACT:
Two telescopically mated tubes carry on their opposite ends laterally extending flanges for engaging the inner faces of opposite panels of rectangular fiberboard ducts to brace them against sagging and/or buldging caused by air-pressure-difference and/or gravitational forces. The inner tube has a series of notches or apertures formed therein and the outer tube has a tongue or pin engageable with a selected notch or aperture to lock the tubes in length-adjusted relative positions. Optionally, the opposite tube ends can have a bendable tongue or a barbed pin for penetrating through the fiberboard wall. The tongue can be bent over the outer face of the duct panel to brace the panel against outward buldging. The barbed pin can receive a pressed-on resilient nut for the same purpose. The tubes can be economically formed from sheet-metal strips bent to define, in cross-section, nearly closed triangles or nested U's.
REFERENCES:
patent: 132475 (1872-10-01), Linville
patent: 1523268 (1925-01-01), McColl
patent: 1793035 (1931-02-01), Whitney
patent: 2535141 (1950-12-01), Kenney et al.
patent: 3118363 (1964-01-01), Burgess
patent: 3776253 (1973-12-01), Yamaguchi et al.
patent: 3881520 (1975-05-01), Murphy
patent: 4158896 (1979-06-01), Farkas
Bryant III James E.
Staubly Ralph F.
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