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US 4,135,640 AGranted
Safety closure device for a pressure vessel
AssigneeIndustrial Filter & Pump Mfg. Co.
InventorsArthur E. MacQuilkin, Elmer J. Kulousek, Earl A. Borre
Life of this patent
Estimating the term…
Abstract
The hold-down bolts on the cover of a pressure vessel cannot be loosened until a pressure relief valve has been opened to relieve the pressure in the vessel and to release a safety member positioned over the bolts.
Claims6
Safety apparatus for preventing the opening of the cover of a pressurized vessel while the pressure in the vessel is different from ambient pressure, a pressure relief valve being mounted to said cover and said cover being secured to said vessel by a plurality of hold-down bolts, comprising
- a plurality of tubular members,
- support means mounting said tubular members in mutually relative positions enabling the simultaneous location thereof over respective ones of said bolts to prevent the removal of said bolts,
- guide means carried by said cover and cooperating with said support means between a first position wherein said tubular members are located over said bolts and a second position wherein said tubular members are not located over said bolts thereby to permit loosening of said bolts, and
- means connected to said relief valve for locking said support means in said first position when said relief valve is closed,
- whereby said bolts cannot be removed to release said cover from said vessel while said relief valve is closed.
2 more elements
Dependencies are inferred from the claim text.