Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1975-03-17
1976-09-07
Steiner, Arthur J.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
29193, 52737, 148 12B, B21C 3704
Patent
active
039791866
ABSTRACT:
A steel rod for prestressing concrete which is enclosed in concrete to introduce prestress in said concrete (hereinafter called a P. C. steel rod). The P. C. steel rod has a circular section around which a plurality of spiral grooves have been formed by means of a die. One or more flat surfaces can be formed in the axial direction or the rod for greater adhesion to the concrete. The P. C. steel rod has a far shorter bond length than a conventional P. C. Steel rod and therefore it has greater adhesion to the concrete and when tensioned, the concrete does not develop longitudinal cracks, thus assuring reliable introduction of prestress in the concrete.
REFERENCES:
patent: 411202 (1889-09-01), Rose
patent: 1399701 (1921-12-01), Dyson
patent: 2816052 (1957-12-01), Hoff et al.
patent: 3561185 (1971-02-01), Finsterwalder et al.
"Concrete", June 1947.
"Univ. of Ill. Eng. Expt. Sto. Bulletins," Abrams, 193, pp. 61, 72, 73.
Neturen Company Ltd.
Steiner Arthur J.
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