A chuck with a generally cylindrical body having a tail section configured to receive a drive shaft of a driver and a nose section having an axial bore formed therein. A plurality of jaws is movably disposed with respect to the body. A nut is rotatably mounted about the body and operatively engages the jaws. A sleeve is non-rotatably coupled to the nut. A shield cap is rotatably secured about the nose section of the body. The chuck also includes a first ring and a second ring that rotates relati...

A drill fixture enabling drilling through hard objects in a confined area includes a housing, a threaded rod connected with the housing, and a tubular adjustment sleeve rotatably connected with the rod. A drill is arranged in the housing and has a drill bit extending in a forward direction. The sleeve is rotated relative the threaded rod for displacement along the length of the rod until the sleeve engages a fixed surface opposite the object to be drilled. With the sleeve rear portion engaging t...

A drill having a replaceable cutting head, modified to eliminate forces which would distort the pocket of the drill shank and otherwise concentrate stresses which would cause failure of the drill. The cutting head has a frustoconical depending connecting member received in a receptacle formed in the shank. In different embodiments, contact between the pocket formed in the shank and the cutting head connecting member is limited. In one embodiment, angle of drive surfaces is modified from prior ar...

A drill bit having a shank portion and a cutting portion, which cutting portion generally has at least one cutting edge and a chip flute that has a helical portion. The drill bit has at least one straight coolant channel that has a coolant exit orifice disposed at least partially in the flute and oriented toward the cutting edges to supply coolant thereto to cool the cutting edges and chips produced during a cutting operation.

A rock drill includes a shank. A percussion piston is arranged to hit the back end of the shank. Further, a pulling element is arranged around the shank, to which a pulling force can be directed in such a manner that the shank can, by the pulling force, be moved toward the percussion piston, when stuck drilling equipment is freed. During rock drilling, a push force is arranged to act on the pulling element, the push force being opposite with respect to the pulling force. The push force is design...

A rock drill including a helical shank and a drill head. The drill head has an end face pointing in a feed direction and at least one roof-shaped carbide cutting element on the end face of the rock drill. The carbide cutting element extends transversely across the drill head and has cutting edges. The end face of the carbide cutting element has an additional chip space at least in front of the carbide cutting element and includes an encircling step to create the additional chip space in the feed...

A drill chuck has according to the invention a chuck body centered on and rotatable about an axis and having a rear end formed with an axially forwardly facing shoulder, a plurality of jaws radially displaceable in the body between a closely spaced tool-gripping position and a widely spaced tool-releasing position, and a tightening sleeve rotatable about the axis on the body and coupled to the jaws for displacing them between their positions on rotation of the sleeve on the body. An annular clos...

A rock drill for rotary hammers is proposed in which a conveying helix (3) having main and secondary webs (6 to 9) is used. A one-piece carbide crown, with its wing-shaped main and secondary lips (24 to 27), is butt-welded to the conveying helix.

A drill chuck has a chuck body centered on and adapt d to be rotated about a longitudinal axis and unitarily formed with a plurality of forwardly open angled guides angularly spaced about the axis and with a rim, respective jaws displaceable along the guides in the chuck body and each formed with a row of teeth, and a tightening sleeve rotatably surrounding the body. A threaded ring rotatable on the body about the axis within the tightening sleeve is fixed to the sleeve and formed with a screwth...

The present invention relates to a power drill which comprises a spindle and a rear bearing mounted on the rear portion of the spindle. A fixed gear wheel is connected to a gearbox and a movable gear wheel is connected to the spindle. An adjustment member is provided on the front portion of the spindle. The adjustment member comprises an adjustment cover, an adjustment fork connected to the adjustment cover and a sleeve connected to the adjustment fork and mounted on the front end of the spindle...