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Manhole cutter for cutting a circular groove of a fixed depth about a manhole, such as in a street, and removing the manhole from the street. The manhole cutter is suspended from a front-end loader or truck-mounted boom and rotated hydraulically from a power take-off unit on the vehicle. A cutter ri

Manhole cutter for cutting a circular groove of a fixed depth about a manhole, such as in a street, and removing the manhole from the street. The manhole cutter is suspended from a front-end loader or truck-mounted boom and rotated hydraulically from a power take-off unit on the vehicle. A cutter ring assembly with staggered cutters, and inside and outside clean-out slots rotate about a central shaft of the cutter. A manhole plate centers the manhole cutter within the manhole from the cutting operations. When the cut is of sufficient depth to extricate the manhole, a keyway disk is rotated to allow a plurality of lever grip assemblies to grip the manhole. Then, the manhole cutter and the manhole is extricated from the street, leaving a larger sized hole about the area of the manhole which is minimum in size with respect to the manhole. A plurality of staggered cutters align along the bottom of the cutter ring assembly to cut through asphalt and dirt, and are mounted in the cutter ring assembly by a bolt and rectangular bar.

대표청구항 ▼

Method of cutting an annular grove about and removing a manhole casting having a lip for holding a cover plate comprising the steps of: a. positioning a shaft carrying a cutter ring assembly, a manhole plate having gripping teeth and a plurality of levers, and a keyway disk into a manhole casting; b

Method of cutting an annular grove about and removing a manhole casting having a lip for holding a cover plate comprising the steps of: a. positioning a shaft carrying a cutter ring assembly, a manhole plate having gripping teeth and a plurality of levers, and a keyway disk into a manhole casting; b. engaging the manhole plate against said lip of said manhole casting; c. rotating the shaft and the cutter ring assembly secured thereon to cut an annular groove about the manhole casting down to a predetermined depth; d. aligning the keyway disk to engage said plurality of levers against said gripping teeth; and, e. engaging said gripping teeth against the inner circumference of the manhole casting.