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US 5,848,655 AGranted
Oscillating mass-based tool with dual stiffness spring
AssigneeIngersoll-Rand Company
InventorsTimothy R. Cooper, Thomas P. Low, Ronald E. Pelrine, Dale W. Ploeger
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Abstract
Disclosed is a low reaction oscillating mass-based torquing tool wherein an oscillating mass is excited into near resonant oscillation by reversing pulses resulting in increased energy stored in oscillation about a dual stiffness spring which develops a higher torque output with the stiffer spring action in the tightening direction and hence tightens the fastener.
Claims6
A resonant oscillating mass-based torquing tool comprising:
- a rotatable resonant oscillating mass;
- a means for effecting oscillation of said mass;
- a dual stiffness spring connecting said oscillating mass to a rotating friction set workpiece;
- and said dual stiffness spring effects a higher torsional output to said workpiece in one tightening rotational direction to rotate said workpiece in a tightening direction;
- and
- a lower torsional output in an opposite rotational direction being insufficient to effect rotation of said workpiece in said opposite rotational direction.
3 more elements
Dependencies are inferred from the claim text.