Active solid-state devices (e.g. – transistors – solid-state diode – Regenerative type switching device – Having at least four external electrodes
Patent
1979-09-28
1981-09-29
Weakley, Harold W.
Active solid-state devices (e.g., transistors, solid-state diode
Regenerative type switching device
Having at least four external electrodes
251196, 251197, F16K 2500
Patent
active
042918626
ABSTRACT:
A gate valve structure has an expanding valve assembly mounted with the valve chamber comprising a gate (32) and segment (34) which may be laterally expanded. The gate and segment have a plurality of coacting interfitting saw-type teeth (46,48) which define cam surfaces (50,56) to effect expansion of the gate valve assembly. A flexible sleeve (64) is secured about the ports (42,44) in the gate and segment to bridge the gap (58) between the gate (32) and segment (34) upon expansion. A torsion spring (72) urges the gate and segment to a contracted position.
REFERENCES:
patent: 600181 (1898-03-01), Smith
patent: 2306490 (1942-12-01), Noble
patent: 2705610 (1955-04-01), Hjulian
patent: 4189127 (1980-02-01), Constantino
Alvarez Patricio D.
Fowler James M.
Moran George A.
ACF Industries Incorporated
Belsheim Stephen T.
Riddle Eugene N.
Weakley Harold W.
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