Abstract: A power tool with a rotation motor, a rotating output shaft (26), and an angle drive (11) connecting the motor to the output shaft (26) and comprising a gear casing (12), a pinion gear (14) connected to the motor, a crown wheel (17) connected to the output shaft (26), and a lubricant dispensing device including a receptacle (28) immovably supported in the gear casing (12) and having a peripheral side wall (30,31) and an end wall (29), wherein the end wall (29) is formed with a through opening (43) for the output shaft (26) and an outlet opening (43) for the lubricant, and an agitator element (44) is freely movable within the receptacle (28) for agitating the lubricant by vibratory movements during operation of the tool, thereby facilitating spreading of the lubricant toward the outlet opening (43).

Abstract: A selectively attachable dust suppressing misting device for use with percussive tools, such as air hammers or jack hammers, includes a frame having a first tube section connected to a fluid source. The misting device includes one or more misting nozzles connected to the first tube section to allow fluid to flow out of the misting device. The misting nozzles are rotatable to allow fluid to be sprayed in a desired direction. The device also includes at least one adjustable clamp for securing the device to various diameters of percussive tools. Preferably, a second clamp is mounted to a housing slidable on the first tube section to allow the second clamp to be moved with respect to the first clamp.

Abstract: Liquid driven hammer machine with a machine housing (1) and a hammer piston (2) moveable to-and-fro in guides (4,5) in the machine housing. The guides are made with an intermediate section (6) and end sections (7,8) on either sides thereof. The slot between the intermediate section and the hammer piston is less than, preferably one half of, the slot between the end section and the hammer piston at the end of the end section turned away from the intermediate section. The intermediate section has according to an advantageous embodiment an ax/al extension which is approximately one third of the length of the guide.

Abstract: The present invention is for an improved feed shell for an air-flushing, rock-drilling system. The improvement extends the life of the feed shell and, in particular, the feed guide of a feed shell on which gibs for directing a rock drill ride. The system, as improved, provides a first nozzle which directs fluid onto a first guide surface of the feed guide and second nozzle which directs fluid onto a second guide surface of the feed guide. The nozzles can be mounted in either manifolds or, alternatively, in the gibs which support and guide the drill on the feed guide.

Abstract: A percussive, fluid-activated jackhammer includes a low pressure lubrication system having a liquid lubrication reservoir chamber formed in a bore of the jackhammer, the lubrication chamber being subject to low percussive fluid pressure in a front piston chamber but not to high percussive fluid pressure in a drive or return chamber of the device. An inlet passageway is provided for adding lubricant to the lubricant chamber. An outlet passageway is provided, with a metering device therein, for flow of lubricant into the bore of the device during reciprocation of a piston in the bore.

Abstract: An improved rotary drill head assembly including a drill head cover having an upper portion, a rotatable drill retaining socket having an outer surface and a support member having an upper portion. The socket extends above the support member. A flinger attached to the upper portion of the support member and having an axial passage extending therethrough, a top cap having an axial passage extending therethrough. An arrangement for attaching the flinger to the top cap including a pin received by one of the flinger and the top cap. A top plate attached to the top cap. The top plate includes an arrangement to protect the pin from the outside environment and to hold the pin in place against axial movement. A sealing arrangement between the upper portion of the drill head cover and the flinger. The flinger, top cap, top plate and upper portion of the drill head cover may be coated with a ceramic material.

Abstract: In a motor driven drilling or chipping device, a housing forms a sealed housing space containing a gear arrangement and an air cushion propulsion mechanism driven by the gear arrangement. The housing space is partially filled with lubricating oil. A pressure equalizing nozzle has a bore connecting the interior of the housing space to the ambient atmosphere outside the housing. The port at the end of the nozzle bore communicating with the housing space is enclosed by wall members forming a stilling chamber. The stilling chamber is in communication with the sealed housing space and is arranged so that regardless of the position of the drilling or chipping device, it is not flooded by the lubricating oil and the lubricating oil does not flow out of the stilling chamber through the nozzle bore.

Abstract: A hydraulically powered impact device for rock drilling having an impact piston driven by a hydraulic drive unit and a shank rod adapted to be struck by the impact piston. A motor imparts a rotary motion to the shank rod by rotating a sleeve through a gear train. The sleeve is rotatably mounted around the shank rod. A chuck is splined to the shank rod and a dog clutch is provided between the sleeve and the chuck for engaging both. A fluid passage is formed for introducing lubricant fluid stored in a gear casing into a chamber accommodating the dog clutch. The fluid passages includes a valve which is held open as long as the cover is connected to the main casing.

Abstract: A pneumatic motor for rock drills and the like having a reciprocating piston with valves at its opposite ends for valving motive air to the piston head from both ends of the cylinder. Large receivers are provided near the respective valves to accommodate availability of air on demand from the valves and to dampen pressure fluctuations. One of the receivers is connected to an external source of fluid under pressure; while the two receivers are interconnected by tubing external to the pneumatic motor itself. This permits the cylinder for the piston to comprise a simple tube provided with exhaust ports only. Additionally, exhaust air and oil from an air motor, which rotates the rock drill, are directed into the area between the lower end of the reciprocating piston and a striking bar for the drill rod to lubricate the reciprocating parts.

Abstract: Oil is supplied to the compressed air supply hose for a jack leg drill by means of a conventional in-line oiler. A substantial part of the oil is separated from the drive air by means of a wall flow separator at the drill and conveyed through internal passages in the drill to various parts to be lubricated such as a chuck and a ratchet mechanism for rotating the chuck.

Abstract: A linear motion impactor device includes an impactor (28) which provides force to a hammer shank (56) only upon application of the hammer against a surface to be impacted thereby saving power and reducing noise during periods of non-use. The impactor (28) which operates on the hammer shank (56) is mounted in a housing (12) and is formed with a bore (30) normally coincident with the axis of rotation (22) of an eccentric cam (24) which is rotated by a power source (20). The impactor (28) is retained in this center-line position by a compression pad (38) positioned between the impactor (28) and the housing (12) and further positioned diametrically opposite the hammer shank (56). In the two embodiments described, either linear bearings (76, 78) or shear pads (42, 44) ensure linear motion to the impactor (28) during operation.

Abstract: A top head drive unit for an earth boring apparatus including a derrick comprises a support member guided along the derrick. The support member includes a pair of spherical roller bearings which support a shaft adapted for connection to a drill string. These roller bearings accommodate a selected degree of movement in the axis of rotation of the shaft. The shaft extends up above the support member, and a rotary drive unit is mounted to the shaft immediately above the support member. Precision roller bearings are used to align the drive unit precisely on the shaft such that the drive unit follows the movement of the shaft as it rotates in the spherical roller bearings of the support member and a torque arm is mounted between the support member and the rotary drive unit to prevent rotation of the rotary drive unit with respect to the support member.

Abstract: A mine roof bolter is described which has a rotary drill head with: (1) sufficient rotative mass that breakage of bits and steel is minimized, (2) a dual drive assembly that provides balanced side thrusts against the bearings so that wear thereof is minimized, (3) a sealing assembly that protects the lubricating oil from contamination by dust and mud under very adverse conditions, (4) circulatory lubricating devices that provide oil to the sealing assembly and drive assembly, and (5) a dust collecting assembly which is suitable for fast and simple cleaning. The mine roof bolter additionally has a lift arm which is constructed with three parallelograms providing useful spatial advantages and a panic bar assembly which enables an operator to stop all hydraulic and electrical systems from two sides of the machine.

Abstract: A pneumatic hammer, hammer drill or like percussion tool incorporating a cartridge-type oil tank detachably installed in the main body of the tool. The oil tank is made of transparent or semitransparent material and held from outside by a holding plate formed with at least one slit, permitting the user to check the tank from outside for an oil consumption. The oil tank is supported on a seat plate which is detachably mounted on the tool main body and which, when removed, enables the user to inspect or repair the interior with ease.

Abstract: A drill comprising a body means having an axial, generally cylindrical, interior space is provided with a first cylindrical piston axially slidable between a first and a second position within the cylindrical space. The piston is provided with an extension in the form of a second piston, and the first and second piston surround an axially disposed flushing tube, which with the piston defines a first annular oiling space. The flushing tube, the first piston and the body define a second annular oiling space, while the flushing tube, the second piston and the body define an annular pumping zone. A source of lubricating fluid communicates with the pumping zone by means of the body inlet as the first piston is moving towards said first slidable position, and the pumping zone communicates with the second annular oiling space by means of the first annular oiling space as the first piston is moving towards said second slidable position. The first annular oiling space and the inlet are provided with one-way valve.