초록 ▼

A highly stable concrete saw for cutting crack control relief grooves features a stabilized and reinforced carriage. The carriage frame comprises a generally C-shaped, rigid metal weldment having a closed side extending between a closed front and closed rear. The opposite side is partially open at t

A highly stable concrete saw for cutting crack control relief grooves features a stabilized and reinforced carriage. The carriage frame comprises a generally C-shaped, rigid metal weldment having a closed side extending between a closed front and closed rear. The opposite side is partially open at the bottom, but closed at the top by an elevated reinforcing bridge that connects the front and rear of the frame. The frame substantially surrounds and pivotally captivates a rigid subframe supporting the drive motor and the blade assembly. The carriage comprises a pair of rigid, inwardly offset and downwardly projecting tabs at its front and rear. The tabs are line bored to journal elongated axles that mount front and rear pairs of resilient rollers. Angled scraper assemblies projecting downwardly in front of each pair of rollers deflect away loose debris to maintain a smooth travel path for the carriage. A belt driven axle terminating in an arbor disposed at the open side of the frame supports a rotary cutting blade. The blade is shrouded by a pivotally displaceable guard that mounts a forwardly projecting roller wheel that is normally firmly biased against the concrete surface. Saw alignment is aided with a deflectable pointer that normally follows the intended cutting path. A controlling handle assembly projects from the carriage rear for saw control. A handle-mounted control cable extends to the motor for pivoting the subframe to adjust blade cutting depth.

대표청구항 ▼

[ What is claimed is:] [1.] A powered saw for cutting relief grooves for crack control in concrete, said saw comprising:a stabilized carriage comprising a generally C-shaped frame formed from a rigid metal weldment and comprising a closed side, a closed front, a closed rear and an opposite frame sid

[ What is claimed is:] [1.] A powered saw for cutting relief grooves for crack control in concrete, said saw comprising:a stabilized carriage comprising a generally C-shaped frame formed from a rigid metal weldment and comprising a closed side, a closed front, a closed rear and an opposite frame side that is partially open wherein the carriage comprises:a first pair of rigid, inwardly offset tabs projecting downwardly from the frame front;a first axle extending between said first pair of tabs;a first pair of resilient, cylindrical rollers on said first axle;a second pair of rigid, inwardly offset tabs projecting downwardly from the frame rear;a second axle extending between said second pair of tabs; and,a second pair of resilient cylindrical rollers on said second axle;a handle coupled to the carriage;an elevated bridge that connects the front and rear of the frame for closing the partially open side;a rigid, subframe pivotally mounted to said frame and surrounded by said closed side, closed front, and partially open frame side;control means extending to the subframe for tilting it to vary cutting depth;a drive motor mounted on said subframe;a blade assembly secured to said subframe and driven by said motor, the blade assembly comprising an arbor projecting from the partially open frame side for removably mounting a selected rotary blade; andat least one scraper assembly projecting downwardly to the concrete from beneath the carriage to deflect away loose aggregate.