Abstract: A bolt on drive assembly for a core drill which utilizes a spoked reinforcer mounted between a pair of discs. The discs are removably mounted on the tube by bolt fasteners. A drive connection is removably mounted and centrally located on a outer disc of the pair of discs. The drive connection is adapted to connect with a drive shaft to cause rotation of the tube.

Abstract: In a cutting disc which has a plurality of radial slots connecting with the peripheral edge of the disc, a transverse slot is located at the base of each radial slot. This transverse slot comprises a thin, arcuate slot positioned concavely to the peripheral edge of the disc. Each end of the transverse slot terminates in a hole. All corners formed between the transverse slot, radial slot and holes are smoothly contoured.

Abstract: The subject invention is a cutting disc having a plurality of radial slots connecting with the peripheral edge of the disc which form multiple tabs integrally mounted to the cutting disc with the tabs protruding outwardly from the peripheral edge of the cutting disc. There is at least one tab for each support segment located between directly adjacent radial slots. When fixedly mounting of the cutting segments into the support segments, the cutting segment is also fixed to a tab.

Abstract: A vibration damper for a road planer and the like with a main frame and a sub-frame movably connected thereto. A prime mover and a tool are mounted on the sub-frame, which includes frame members forming compartments adapted to receive lead shot particles therein. The particles absorb vibrational energy from the prime mover and the tool. A method of damping vibration is disclosed wherein vibrational energy is transmitted to the lead shot particles which vibrate and generate heat. The heat is dissipated through the frame members to the atmosphere.