The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 1994
Filed:
Dec. 09, 1991
Franklyn J Amorese, Hilton, NY (US);
Robert R Loomis, Rochester, NY (US);
The Pfaudler Companies, Inc., Rochester, NY (US);
Abstract
A quick opening manhole cover assembly is provided which is suitable for use with virtually any shape manhole cover of a pressure vessel. The assembly broadly includes a manhole cover having outer dimensions which are less than the inner dimensions of the manhole so that the cover can pass freely therethrough. The assembly also includes a structure for raising and lowering the cover into and out of the manhole. A sliding lock mechanism is located above the cover and is engageable to prevent axial movement of the cover. A safety mechanism is provided to prevent the lock from disengaging when the vessel is under pressure. Once the lock is engaged, the cover is raised and a seal carried atop the cover provides a fluid tight sealing engagement of the cover. The pressure within the vessel urges the cover further upward to further ensure the integrity of the seal.