Preload piston actuator

Details Preload piston actuator Preload piston actuator

1998-03-23

1999-12-07

Williams, Hezron

Measuring and testing

Vibration

Vibrator

73665, G01M 332

Patent

active

059964170

ABSTRACT:
A hydraulic actuator for vibration testing equipment includes a double-acting piston having a coaxial floating piston assembly coupled to one end of the piston rod. The floating piston assembly has a preload piston pressurized to allow the overall length of the actuator to adjust for small changes in distance between the mating surfaces of the vibration test equipment when the equipment tilts or rotates.

REFERENCES:
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patent: 5216931 (1993-06-01), Hirsch et al.
patent: 5343752 (1994-09-01), Woyski et al.
patent: 5488895 (1996-02-01), Tobiasz
patent: 5522421 (1996-06-01), Holt et al.
patent: 5544528 (1996-08-01), Woyski et al.

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