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In order to cut soft concrete before it has completely hardened, or about 12 to 18 hours after finishing, a rotating cutting blade and its drive motor are mounted on a wheeled support platform. The blade extends through a slot in the platform, and also through a skid plate depending from the platfor

In order to cut soft concrete before it has completely hardened, or about 12 to 18 hours after finishing, a rotating cutting blade and its drive motor are mounted on a wheeled support platform. The blade extends through a slot in the platform, and also through a skid plate depending from the platform, in order to cut the concrete below the skid plate. The slot and the skid plate are sized to support the concrete as it is being cut and to inhibit cracking and chipping of the concrete during cutting. The slot preferably has as little space as possible between the sides of the slot and the adjacent sides of the cutting blade. An extendable handle allows the device to be used beyond the physical reach of the operator.

대표청구항 ▼

An apparatus for cutting grooves in the exterior surface of concrete, comprising: rotating cutting means urged against said exterior concrete surface for cutting a groove in said exterior surface, said cutting means having a cutting edge, two sides, and a trailing edge, said cutting edge rotating ou

An apparatus for cutting grooves in the exterior surface of concrete, comprising: rotating cutting means urged against said exterior concrete surface for cutting a groove in said exterior surface, said cutting means having a cutting edge, two sides, and a trailing edge, said cutting edge rotating out of the exterior surface of the concrete; a motor driving said cutting means; propelling means for moving the apparatus across the exterior surface of the concrete; support means in contact with the exterior surface of said concrete for supporting the surface of said concrete within 0.125 inches of said sides immediately adjacent the cutting edge of said cutting means as said cutting means cuts said groove, said support means inhibiting cracking, chipping and damaging of the said concrete finish adjacent said groove; movement means for allowing movement of said cutting means away from the exterior surface of said concrete in response to contact between said cutting means and an obstacle in the concrete, said movement means allowing said cutting means to at least partially circumvent said obstruction; resilient means by which said cutting means is resiliently urged against said exterior surface of said concrete and for predetermining the force with which the cutting means is urged against the exterior surface of the concrete; and wheel means for moving said apparatus across the exterior surface of said concrete.