Stock material or miscellaneous articles – All metal or with adjacent metals – Helical or with helical component
Patent
1976-11-23
1978-10-10
Schafer, Richard E.
Stock material or miscellaneous articles
All metal or with adjacent metals
Helical or with helical component
52737, E04C 506
Patent
active
041197640
ABSTRACT:
A steel spiral reinforcing rod which is a high-strength bar having a yield strength of over 55kg/mm.sup.2 and with the spiral grooves in the surface thereof, which after being wound into a spiral having the desired dimension can be axially compressed for delivery to the construction site, and when released from the fully-compressed state, the coil will expand to the desired due to its own elasticity and will not suffer plastic deformation even if stretched by an external force. For easy workability, the steel bar is heated in a heating furnace or an induction-heating coil to a specified temperature and then wound in the heated state on a winding machine of specified configuration into spiral form with the coils at the desired pitch. When the bar made of a material which is relatively easy to work, it is desirable that helical winding be done by cold working, followed by heating to a specified temperature in a furnace to remove the stress developed in the bar when it is worked.
REFERENCES:
patent: 2405274 (1946-08-01), Sitites
patent: 3187466 (1965-06-01), Zerr
patent: 3979186 (1976-09-01), Mizuma
Awazu Tetsuro
Mizuma Katsuhisa
Neturen Company Ltd.
Schafer Richard E.
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