Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
William R. Austin0
Brian J. Rachwitz0
Herbert Carl Barnum0
James F. Malpass0
Jeremy I. Johnson0
John H. Snyder0
Lee M. Veldboom0
Rex A. Garringer0
...
Date of Patent
March 11, 2008
0Patent Application Number
114200830
Date Filed
May 24, 2006
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A lift-assisted manhole cover assembly with a flush surface and external pivot shaft. The cover includes a mounting tab that extends beyond the general periphery of the cover. The mounting tab may be connected to a shaft that is threadedly engaged with the frame. A spring may be mounted between the frame and the mounting tab, for example, in a sleeve, to provide a mechanical assist in lifting the cover. The sleeve may be disposed outside the manhole opening where it does not block access to the manhole opening.
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