ADJUSTABLE MANHOLE COVER

摘要

A manhole cover assembly has an inner cylinder and an outer cylinder. An upper ratchet mechanism extends axially and circumferentially about an outwardly facing surface of the inner cylinder. A lower ratchet mechanism extends axially and circumferentially about an inwardly facing surface of the outer. The lower ratchet mechanism is configured to mesh with the upper ratchet mechanism at one of a plurality of distinct ratcheting positions. A cover plate is disposed on one of the inner cylinder and the outer cylinder. The cover plate is at a first elevation when the lower ratchet mechanism meshes with the upper ratchet mechanism at a first distinct ratcheting position. The cover plate is at a second elevation when the lower ratchet mechanism meshes with the upper ratchet mechanism at a second distinct ratcheting position. The first elevation is different from the second elevation.

主权项

1. A manhole cover assembly comprising:
an inner cylinder; an outer cylinder; a cover plate disposed on one of said inner and outer cylinder; an upper ratchet mechanism extending axially and circumferentially about an outwardly facing surface of said inner cylinder; a lower ratchet mechanism extending axially and circumferentially about an inwardly facing surface of said outer cylinder, said lower ratchet mechanism configured to mesh with said upper ratchet mechanism at one of a plurality of distinct ratcheting positions; wherein
said cover plate is at a first elevation when said lower ratchet mechanism meshes with said upper ratchet mechanism at a first one of said plurality of distinct ratcheting positions,said cover plate is at a second elevation when said lower ratchet mechanism meshes with said upper ratchet mechanism at a second one of said plurality of distinct ratcheting positions, andsaid first elevation is different from said second elevation.