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US 4,906,128 AGranted
Adjustable manhole cover
OwnerRoger Trudelinventor
Life of this patent
Estimating the term…
Abstract
An adjustable manhole top which can be readily raised up or down in minutes to correct problems when the ground around it heaves. A cylindrical sleeve with a plurality of spaced elongated shoulders extending longitudinally along an internal surface thereof, is adjustably seated about upwardly extending projections from a support rim. A lock, removably supported on the support rim, is provided with a height adjustment mechanism to support a corresponding shoulder on the sleeve, to secure the sleeve at a desired height.
Claims16
An adjustable manhole top comprising;
- (a) a cylindrical sleeve having an internal, manhole cover-supporting rim towards one end, a plurality of spaced, elongated shoulders extending longitudinally along an internal surface of the sleeve;
- (b) a support rim comprising a planar base to be rested on the upper edge of a manhole foundation a portion of the base extending inwardly beyond the inner wall of the sleeve when in position to supportably receive the cylindrical sleeve, a portion of the rim upwardly extending from said base and positioned so as to receive the cylindrical sleeve;
- and
- (c) a plurality of lock means positionable to be movably supported on the base,
- an individual lock means being provided for each of the elongated shoulders of the support sleeve, said lock means constructed so as to support the shoulders and prevent relative rotative or vertical movement of the cylindrical sleeve with respect to the support rim when the lock means are in position on the rim base.
2 more elements
An adjustable manhole top comprising:
- (a) a sleeve having an internal, manhole cover-supporting rim towards one end, a plurality of spaced, elongated shoulders extending longitudinally along an internal surface of the sleeve;
- (b) a support rim comprising a planar base to be rested on the upper edge of a manhole foundation, a portion of the base extending inwardly beyond the inner wall of the sleeve when in position to supportably receive the cylindrical sleeve, a portion of the rim upwardly extending from said base and positioned so as to receive the sleeve;
- and
- (c) a plurality of lock means positionable to be movably supported on the base,
- an individual lock means being provided for each of the elongated shoulders of the support sleeve, said lock means constructed so as to support a corresponding shoulder and prevent relative rotative or vertical movement of the sleeve with respect to the support rim when the lock means are in position on the rim base.
2 more elements
Dependencies are inferred from the claim text.