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US 8,011,851 B1Granted
Manhole cutting and removing device
OwnerMichael Critesinventor
Life of this patent
Estimating the term…
Abstract
A device to secure, cut and sequentially remove a manhole from a street environment. The manhole removing device is supported and rotatably driven hydraulically by a mobile operation equipment. A circular disk assembly has adjustable pavement cutters adjustably positioned from there within an inter-related manhole centering and a locking alignment and engagement plate assembly define a one-step cutting and removal of an existing manhole from the street for replacement.
Claims13
A manhole cutting and removing device comprising,
- a cutting assembly for being rotated about a central vertical axis to cut a circular slot about a manhole,
- said cutting assembly having a plurality of independent adjustable tubular mounting arms extending therefrom,
- cutting blades secured to and depending from said respective tubular mounting arms,
- a locking alignment and extraction assembly selectively and independently engaged within said manhole comprises,
- opposing spaced parallel engagement arm elements slidably extending from pairs of spaced parallel guide tubes,
- a drive shaft support and rotational engagement fitting extending from said cutting assembly,
- an extraction drive shaft extending from said shaft support through said locking, alignment and extraction assembly for selective engagement therewith and removal thereof,
- integrated independent elements support for said manhole removing device in and extending from said cutting assembly when not in use.
5 more elements
Dependencies are inferred from the claim text.