Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – And means to apply stress to preform and uniting in stressed...
Patent
1985-09-06
1986-12-16
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
And means to apply stress to preform and uniting in stressed...
29452, 52225, 52227, 249 50, 264228, 264229, B28B 2306
Patent
active
046294082
ABSTRACT:
A portable system for making harped, reinforced concrete beams includes a series of inverted T-shaped concrete bed sections, with aligned longitudinally extending holes for receiving tensioning cables to hold the sections together, to provide two beds, one on either side of the center wall of the sections, to make the concrete beams. At points near the center of each beam to be formed, arrangements for "harping" or depressing the longitudinally extending tensioning steel strands or cables are provided. The harping arrangements include a lever pivotally mounted on the central wall of the concrete sections to pivot in either direction to alternatively harp beams on either side, with intermediate lever actuated arrangements including a harping fork for engaging the steel strands, and screw threaded arrangements at the outer end of the lever for pulling the lever down toward the outer edge of the concrete bed, thereby depressing and harping the tensioning steel strands which are to be embedded in the concrete beams.
REFERENCES:
patent: 455687 (1891-07-01), McCarthy
patent: 2958507 (1960-11-01), Hartup
patent: 3003217 (1961-10-01), Gerwick, Jr.
patent: 3050283 (1962-08-01), Tumey
patent: 3084909 (1963-04-01), Carr
patent: 4149306 (1979-04-01), Tice
patent: 4492552 (1985-01-01), Murakami et al.
"Frictionless Deflectors Simplify Pretensioning", Construction Methods and Equipment, May 1958.
Curd Andrew T.
Giron Anthony S.
Arctic Equipment Rental, Inc.
Housel James C.
Woo Jay H.
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