Abstract: The present invention relates to an improved cutting bit adapted to be rotationally and axially movable within the block cutting bit assembly. The invention further includes a spring for dampening the axially transmitted forces which the bit is subjected to during cutting operations. In an alternative embodiment, a retainer cap having a pin engages a lug on the shank of the cutting bit so as to bias the bit during cutting operations.

Abstract: A block and locking mechanism and cutter bit for a stump grinding machine. The block having a shank receiving cavity being defined by a surrounding irregularly shaped inner wall that includes a pair of opposed end walls interconnected by a pair of opposed side walls with each side wall being tapered inwardly from the opposed end walls such that the cavity has a varying width from end wall to end wall. The cutter bit including a shank adapted to be received within the cavity of the block with the shank having a cross-section that generally conforms to the shape of the cavity such that the cutter bit is prevented from rotating when inserted within the cavity and held within the block.

Abstract: A bushing plate cutter for excavating trenches in various surfaces such as asphalt, concrete, rocky, or icy ground has a plurality of abutting top plates with bushings welded to one end of the top plates and blocks having holes therein for carrying cutting bits welded to the other side of the top plates. Sets of side plates each contain two parallel side plates abutting and perpendicular to the top plates. The side plates are connected to each other by oppositely oriented bolts which pass through the bushings and the links of a chain element. The configuration is such that there is uniform distance between the cutting bits.

Abstract: The present invention relates to cutter bit devices and more particularly to cutter bit devices of the type for detachable connection to a rotatable member such as an excavating wheel, chain cutter, cement saw or the like for various excavating operations as in road planing or scarifying, long-wall coal mining, sawing concrete or the like.

Abstract: A mining block carried by power-operated moving apparatus which is apertured to receive and retain the mounting shanks of elongate mining bits having a sharp wear point extending beyond the block. A block has an open-ended cylindrical recess which ensmalls at the base to a smaller coaxial recess. A conical shoulder at the juncture of the two recesses provides a step for the inner and base end of a mining bit to serve as a wear surface. A retainer on the shank above the base end holds the shank within the cylindrical recess. This eliminates wear at the mouth of the open-ended recess and prolongs the life of the mining block.

Abstract: In a mining machine which incorporates cylindrical cutting bits having conically shaped heads and located in sockets of bit holders, the cutting bits are retained within the sockets by split tubular spring sleeves. The split spring sleeves are located on the shanks of the bits and resiliently engage the inner surface of the sockets thereby securing the bit in the mount. The bit is free to rotate and the sleeve interposed between the socket and the bit prevents wear on those parts of the bit and mount.