Gary C Robbins

US Patent:

44523726, Jun 5, 1984

Filed:

Jul 8, 1983

Appl. No.:

6/511899

Inventors:

Gary B. Robbins - Houston TX

Assignee:

Modco Industries, Incorporation - Conroe TX

International Classification:

B65D 4500

US Classification:

220316

Abstract:

A pressure activated safety device includes a body structure defining an internal chamber having a partition movably disposed within the chamber. Pressure from a pipeline, pressure vessel, etc. , acts upon the partition and positions it at a locking position preventing a venting seal from being released. A seal releasing element is movable relative to the body structure and is manually forced into an unlocking position against the bias of pressure acting upon the partition. The partition is pressure responsive such that it is manually movable from the locking position only upon the occurrence of a negligible pressure condition within the pressure chamber, thus providing for movement of a mechanical object only under an internal pressure condition that renders the apparatus safe.