Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
February 15, 2011
Patent Application Number
12572274
Date Filed
October 2, 2009
Patent Primary Examiner
Patent abstract
A manhole assembly which is designed to be opened with less strength consists of a circular frame (1) with a cup (11) provided on an end, and a cover (2) with an arm (21) which joints said cup (11) provided on an end thereof, characterized in that a first bracket (12) is disposed in an inner wall of the frame (1) where the cup (11) is provided, and a second bracket (22) is provided on a bottom of the cover (2). A hydraulic device (3) is provide therebetween and pin joints with both first and second brackets (12, 22) respectively, and a locking mechanism (4) is disposed on an opposite end of the arm (21) for sealing the cover (2) and frame (1) tightly.
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