Abstract: A saw blade is provided which includes an inner collar separated from an outer collar with a resilient isolated layer. The inner collar fastens to the arbor shaft of a driving motor, while the outer collar is welded to the rim containing hardened particles, such as diamond bits. The inner and outer collars form inner and outer collar flanges which receive the resilient isolating material therebetween. In an alternative embodiment, the inner and outer collars are separated from one another with a plurality of plugs formed of resilient isolating material. The plurality of plugs are formed in a circular pattern about the arbor shaft and are spaced apart from one another. In another embodiment, a vibration dampening coupler is fastened to the arbor shaft and formed separate from the cutting blade. The isolating resilient layer may be formed as a solid layer, as a plurality of O-rings, or with a void therein.

Abstract: A saw blade is provided which includes an inner collar separated from an outer collar with a resilient isolated layer. The inner collar fastens to the arbor shaft of a driving motor, while the outer collar is welded to the rim containing hardened particles, such as diamond bits. The inner and outer collars form inner and outer collar flanges which receive the resilient isolating material therebetween. In an alternative embodiment, the inner and outer collars are separated from one another with a plurality of plugs formed of resilient isolating material. The plurality of plugs are formed in a circular pattern about the arbor shaft and are spaced apart from one another. In another embodiment, a vibration dampening coupler is fastened to the arbor shaft and formed separate from the cutting blade. The isolating resilient layer may be formed as a solid layer, as a plurality of O-rings, or with a void therein.

Abstract: A rotary grooving or grinding drum is mounted about a drive shaft. The drum has an inner core of steel, an intermediate sleeve of neoprene rubber and an outer sleeve of steel. The neoprene intermediate sleeve provides absorption of the shocks, jars and harmonic vibrations that the drum undergoes during use. The exterior surface of the outer sleeve is provided with a plurality of cutting segments disposed in a particular configuration depending on whether it is desired to groove or grind the surface of the concrete or asphalt pavement. Each cutting segment or group of segments may be separately removable mounted on the exterior surface of the outer sleeve so that worn out cutting segments can be individually replaced.

Abstract: An improved circular saw blade assembly for cutting in a single pass a two tier groove in a concrete areaway. The saw blade body having a first row of cutting elements in the form of a metallic matrices containing fragmented diamond particles secured to the blade body periphery. A plurality of cutting blocks formed of the same material as the cutting elements are positioned in a circular configuration intermediate the periphery and the center of the blade body. The cutting blocks are secured to the blade body so as to position the cutting faces on the cutting blocks on each side of the blade whereby the cutting faces coact to cut a groove in the concrete above and wider than the groove cut by the peripheral cutting elements.