Supports – Props and braces – Adjustable length
Patent
1975-12-15
1977-08-09
Halvosa, George E. A.
Supports
Props and braces
Adjustable length
52167, 188 1B, 267134, F16F 1504
Patent
active
040405907
ABSTRACT:
The force transmitted to vibration-isolated equipment during a seismic event can be essentially limited to the force generated by the floor input acceleration by a combination of friction restraining devices and energy-absorbing stops constructed into the vibration isolators which support the equipment. The friction restraint devices permit essentially undamped vibration of the equipment during normal operation but provide a frictional force which restrains vibration of the equipment at amplitudes greater than a selected value. Any movement of the equipment in excess of the selected amplitude that results from a floor input force that exceeds the frictional restraining force of the friction restraint devices is limited by the energy-absorbing stops, which transmit to the equipment with a small amplification only the residual of the input force over the frictional force.
REFERENCES:
patent: 1763682 (1930-06-01), Wallace
patent: 2173342 (1939-09-01), Rosenzweig
patent: 2281955 (1942-05-01), Rosenzweig
patent: 2359915 (1944-10-01), Hussman
patent: 2586307 (1952-02-01), Crede
patent: 2631841 (1953-03-01), Tillou et al.
patent: 2660386 (1953-11-01), Munro
patent: 2687270 (1954-08-01), Robinson
Halvosa George E. A.
Korfund Dynamics Corporation
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