Static structures (e.g. – buildings) – Machine or implement
Patent
1976-06-23
1977-11-08
Ridgill, Jr., James L.
Static structures (e.g., buildings)
Machine or implement
52739, 52740, E04C 503
Patent
active
040569110
ABSTRACT:
A steel bar for concrete reinforcement has a non-circular cross-section which comprises two sets of transverse ribs disposed respectively at diametrically opposite surface portions of the core of the steel bar, each set consisting of a number of transverse ribs of a lug-forming projection type disposed at a position corresponding to every pre-selected pitch in the longitudinal direction of the steel bar and extending therefrom in planes substantially transverse to the core; and a pair of longitudinal ribs disposed on the diametrically opposite surface portions of the core at the intermediate positions between the sets of transverse ribs and extending from the core linearly in the longitudinal direction thereof; the outer portion of each of the longitudinal ribs being as remote as or less remote from the axis of the steel bar as compared with the distance between the axis and the surface of the portion on the outer circumferential plane of the core located at the remotest position from the axis; the major central portion of the outer surface of each of the transverse ribs being placed on the lateral surface of a hypothetical column of a larger diameter than the hypothetical column having the axis of the steel bar as its center and the lateral surface of which tangentially contacts the outer surface of the core; and the outer surface of the wing portion of each of the transverse ribs being disposed in such a manner that the distance from the axis is reduced progressively towards the outer portion of the longitudinal ribs; whereby the transverse ribs can mate with a female helical thread of a corresponding pitch in a nut, coupler or anchor sleeve.
REFERENCES:
patent: 3292337 (1966-12-01), Finsterwalder
(Kobe Steel, Ltd.)
Ridgill, Jr. James L.
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