Receptacles – Closures – Having means for securing or retaining closure in its closed...
Patent
1978-09-25
1979-06-05
Hall, George T.
Receptacles
Closures
Having means for securing or retaining closure in its closed...
292111, 292257, B65D 4516
Patent
active
041571460
ABSTRACT:
Individual clamping structures are described which require only two main members, a pivoted handle member and a clamping member journaled on an integral boss on the handle member. Several types of cam structure are described for positively breaking the pressure seal of a closure during relieving movement of the clamp, thereby insuring the release of any residual pressure while the clamp is still limiting closure movement. A further aspect of the invention directs escape of pressurized gas away from the operator by arranging multiple clamping devices so that clamps near the operator remain closed until all other clamps have been relieved. An opening is thereby provided for blast release on the side of the closure opposite to the operator. The clamps of the invention can secure closures for vessels exposed to external as well as internal pressure, can be symmetrical in the axial direction, are well adapted for power operation and for coupled operation of several clamps, and can readily accommodate an air slide for unloading granular material without closure release.
REFERENCES:
patent: 3292812 (1966-12-01), Svenson
patent: 3441166 (1969-04-01), De Frees
patent: 3514009 (1970-05-01), Emery et al.
Hall George T.
Lewis Charlton M.
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