Patent attributes
A manway lift device comprises two hinge assemblies, each hinge assembly comprising a first hinge member, a second hinge member, a smooth bore bushing, an internally threaded bushing and an adjustable biasing assembly. At least one of the bushings of each hinge assembly including a first end protruding beyond an exterior face of the first hinge member of the hinge assembly and including a second end having dogs disposed thereon, the dogs engaged in dog holes disposed through the second hinge member of the hinge assembly. The smooth bore bushing of each hinge assembly receiving a bolt through the internal bore thereof, the bolt threaded received in the internally threaded bore of the threaded bushing of the hinge assembly. The bolts rigidly affix the bushings to the hinge assemblies. Each hinge assembly connected to a manway cover and a manway collar. The biasing assemblies biasing the manway cover toward an open position with respect to the manway collar.
