Abstract: A rock drilling machine of the self-feeding, integrated type which is designed to operate in situ in a drill hole. The rock drilling machine comprises a drive unit (1), an anchoring unit (2), and a feeding unit (3) which is active between the anchoring unit (2) and the drive unit (1). The drive unit (1) comprises a hydraulic power assembly (5, 8) at the rear end of the unit, a drill bit (21) which is rotatable at the front end of the unit, a guide (10) with a longitudinal cavity (23), which guide extends between the hydraulic power assembly and the drill head and connects these non-rotatably to each other, a rotatable drive shaft (22) which extends from the hydraulic power assembly, through the said cavity in the guide, for rotation of the drill bit, and first securing devices (17) in order to be able to anchor the drive unit releasably in the drill hole.

Abstract: The log feeding device includes a feeding wheel that has an upper side portion axially from a lower side portion and a rim extending therebetween. The side portions extend outwardly and laterally from the wheel. An elastic tire is mounted on the rim of the wheel between the upper and lower side portions. A flexible net is attached to the upper and lower side portions and is conformable to the shape of the elastic tire. The flexible net includes a plurality of chain strings that are attached to the side portions at connection points. Each chain string has one end attached to an upper connection point and an opposite end attached to a lower connection point so that there is a diagonal straight distance between the upper and lower connection points. One set of the chain strings forms an angle A relative to one side of the longitudinal axis and the other set forms the same angle A relative an opposite side of the longitudinal axis of the wheel.

Abstract: A holder device for use in a motor driven grinding machine for grinding button bits. The grinding machine has an output shaft formed with an axially extending passageway for receiving a stem attached to and extending outwardly from a grinding cup. The shaft has interengaging drive means for driveably engaging the grinding cup to the free end of the shaft. An O-ring engages between the stem and the passageway for removably retaining the stem in the passageway.

Abstract: An arrangement for a boom for confining and collecting escaped oil, or the like, having a tubular casing and a shield part attached thereto. A plurality of spaced dividing walls are disposed within the tubular casing. The tubular casing is movable between a collapsed rest position and an expanded operational position. Expansion devices are attached to the tubular casing and are movable between a folded position and an unfolded position. Biasing members are attached to the expansion devices for urging the expansion devices into the unfolded position so that the tubular casing is moved into the expanded position. A valve is operatively attached to the tubular casing so that air may flow into the tubular casing through the valve when the tubular casing is expanded. An impervious flexible sheet material has a mid-portion and opposite side edges sealingly attached to the inside of the tubular casing so that the bottom end portions of the sheet hang.

Abstract: Disintegrated material is supplied to a pressure chamber by a rotatable and axially translatable screw piston. The piston is rotated while in a first axial position to transport and compact the material in a receiving chamber against a closed output valve in front of the piston. The output valve is opened and the compacted material is moved into the pressure chamber by axial non-rotative motion of the piston. The output valve then is closed, and the piston is axially returned to its first axial position while rotating in the same direction as before. The operation cycle is repeated as above. An apparatus for carrying out a process comprises an axially movable guide piston rotationally carrying and guiding the screw piston for rotation and axial movement by action of a hydraulic cylinder and a mechanism for rotationally positioning the screw piston.