Abstract: A chain saw cutting device and method for flush and square cutting walls and other flat concrete surfaces is disclosed. The chain saw cutting device is typically used in conjunction with a track-mounted circular saw cutting assembly, each being removably mounted either on a trolley which rides on, or directly to a track structure, which track structure is attached to the surface to be cut. The chain saw cutting device has an elongated bar and cutting chain which when mounted are positioned in the same cutting line made by the circular saw assembly. The carriage structure of the chain saw cutting device includes a reversible cutting drive and extends on only one side of a cutting plane containing the chain bar and cutting chain. Hence, the chain saw cutting device permits square cutting along the cutting line as well as flush cutting with respect to a perpendicular side wall, ceiling or floor.

Abstract: A chain saw cutting device and method for flush and square cutting walls and other flat concrete surfaces is disclosed. The chain saw cutting device is typically used in conjunction with a track-mounted circular saw cutting assembly, each being removably mounted either on a trolley which rides on, or directly to a track structure, which track structure is attached to the surface to be cut. The chain saw cutting device has an elongated bar and cutting chain which when mounted are positioned in the same cutting line made by the circular saw assembly. The carriage structure of the chain saw cutting device includes a reversible cutting drive and extends on only one side of a cutting plane containing the chain bar and cutting chain. Hence, the chain saw cutting device permits square cutting along the cutting line as well as flush cutting with respect to a perpendicular side wall, ceiling or floor.

Abstract: A rigid arm supports the outboard end of a shaft of a power driven apparatus to minimize transverse deflection of the shaft under load. The arm extends through a loop formed by a flexible drive member and permits replacement of the drive member without removal of the arm. In a preferred embodiment, the arm is a cantilevered arm of substantially rectangular cross section which is bolted or otherwise secured to the apparatus and has a bearing at its outer end which engages the output shaft.

Abstract: A step groover apparatus has a housing to which a direct drive means is attached. The drive means has a rotatable shaft extending into the interior of the housing and on which a plurality of grooving blades are fixed in space relationship. The blades extend through an opening in a lower portion of the housing. The housing has front and rear skids on which the apparatus slides as it moves along the top of the step. The skids are vertically adjustable to vary the depth of the groove to be cut in the step. A vertically and horizontally adjustable face guide is adapted to be forced against the face of the step so that the grooves will be parallel to the step face. A radially extending handle is attached to the housing so that the rear skid may be pressed downward against the top of the step. A laterally extending handle is attached to the housing so that the front skid and the face guide may be simultaneously pressed against the top and face of the step, respectively.