Spring devices – Torsion – Coil
Patent
1994-08-15
1995-11-07
Oberleitner, Robert J.
Spring devices
Torsion
Coil
267275, 267168, F16F 106
Patent
active
054641977
ABSTRACT:
A helical torsion spring is provided having an adjustable spring rate. The torsion spring includes a main spring formed from a coil of wire having a first end and a second end. The wire extends away from the first end to form a first arm and away from the second end to form a second arm. The main spring is loaded torsionally by angular displacement of the first arm with respect to the second arm about a central axis passing through a geometric center of the coil. An inside diameter of the coil defines a core. An adjustment spring is oriented within the core. The adjustment spring is formed from adjustment spring wire configured in a manner similar to that of the main spring. The adjustment spring exhibits an exterior diameter not less than the inside diameter of the main spring. The adjustment spring is rotatable to threadably adjust a proportion of the core of the main spring that includes the adjustment spring therein.
REFERENCES:
patent: 736333 (1903-08-01), Meyer
patent: 3337183 (1967-08-01), Horneck et al.
patent: 4155547 (1979-05-01), Savio et al.
patent: 4439946 (1984-04-01), Altier
patent: 4900019 (1990-02-01), Shamir
patent: 4907506 (1990-03-01), Davis et al.
patent: 4912783 (1990-04-01), Shafer
patent: 5052404 (1991-10-01), Hodgson
patent: 5176370 (1993-01-01), Yamamoto
Von Nostrand's Scientific Encyclopedia, 1968, p. 1711.
Shingly and Mitchell, "Helical Torsion Springs", 1983, McGraw Hill Series in Mechanical Engineering pp. 469-472.
Kreten Bernhard
Oberleitner Robert J.
Poon Peter M.
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