Coil assembly
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United States of America Patent
Stats
-
Nov 25, 1980
Grant Date -
N/A
app pub date -
Feb 13, 1979
filing date -
Feb 13, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A coil assembly is formed by an elastic metal wire helical extension spring coil having convolutions resiliently urged towards each other and held apart by spacers pinched between the convolutions and held there by the spring-back of the convolutions. The spacers can interspace the coil convolutions and be made to extend radially inwardly and outwardly beyond the inside and outside of the coil, so as to radially space the coil from a coil center and the inside of a tubular casing enclosing the coil. In this way a tubular radiant heater can be made by using electric resistance wire to form the coil and making the spacers from refractory insulating material.
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