摘要:
A roof drill bit has an elongate roof drill bit body, which has a forward end and a rearward end. The roof drill bit body contains a slot at the forward end. The roof drill bit body contains a dust port wherein the dust port has a central longitudinal dust axis. The roof drill bit further has a hard insert received within the slot wherein the hard insert has a leading surface. The leading surface of the hard insert is rotationally forward of the central longitudinal dust axis of the dust port.
摘要:
A roof drill bit has an elongate roof drill bit body, which has a forward end and a rearward end. The roof drill bit body contains a slot at the forward end. The roof drill bit body contains a dust port wherein the dust port has a central longitudinal dust axis. The roof drill bit further has a hard insert received within the slot wherein the hard insert has a leading surface. The leading surface of the hard insert is rotationally forward of the central longitudinal dust axis of the dust port.
摘要:
The present invention is a drill bit for cutting holes in materials such as concrete comprising a cylindrical body having a leading edge, a top edge and a conical top plate. The top plate has an aperture about its center and is affixed to the top edge of the cylindrical body. A threaded nut having a shaped upper portion and a cylindrical shaped lower portion is affixed through the aperture of the top plate for connecting the bit to a drill. The leading edge is able to receive one or more cutting or abrasive pads for cutting concrete or stone.
摘要:
The invention provides a cutter blade (4) adapted to be arranged in a milling drum (1) of a milling machine. The cutter blade (4) has an annular body (7), and peripheral teeth (8) arranged at the annular body (7). The teeth (8) have a tooth face (9) and a clearance face (10) which intersect at a cutting edge (11). The teeth (8) are alternately arranged such that the tooth face (9) of one tooth (8a) is oriented in one tangential direction and the tooth face (9) of a neighbouring tooth (8b) is oriented in an opposite tangential direction. Thus a more versatile cutter blade is provided.