Abstract: Down-the-hole drilling machine comprising a housing in form of a tube (1), a hammer piston (6) being movable to-and-fro in the tube and intended for impacting a drill bit (5). The hammer piston is at its ends provided with end sections in form of polygons with rounded corners (51, 52). These end sections are turned relative to each other an angle which is half as large as the angle between two adjacent corners.

Abstract: A drilling tool for percussive and rotary drilling in advance of a trailing casing tube (20) has a reamer (15) pivotally journalled and an eccentric shaft (12) rearwardly of a centric pilot bit (11). The reamer (15) has an eccentric portion (32) carrying axially directed hard metal button inserts (36-40) grouped within an arcuate angle (V) of a circle sector centered on the drilling axis (C). The inserts comprise primary inserts (36-38) with a radial reach defining the full diameter of the drilled hole and inner secondary inserts (39, 40) closer to the shaft (12). The reamer (15) is pivotable on the shaft (12) between a projected and a retracted position. When projected, the group of button inserts (36-40) ream up the hole from the diameter drilled by the pilot bit (11) to the full diameter of the hole enabling the casing tube (20) to advance. In the retracted position, the drilling tool (10) can pass through the casing tube (20).

Abstract: A pressure fluid actuated lubricator having a housing (46), a pressure fluid channel (43, 42, 21) leading from an inlet opening (2) to an outlet opening (7), a reservoir (44) for a lubricant and a discharge device (19) for the lubricant. The reservoir (44) is arranged to be movable by being acted on by the pressure fluid and transfers the pressure force to the lubricant and the discharge device (19). The reservoir is sealed against the penetration of pressure fluid and decreases in effective volume in proportion to the discharged amount of lubricant.

Abstract: Rock drilling device comprising a drilling tool with a set of tubes (7) and a set of rods (9) arranged therein. The drilling tool comprises a number of sections which each comprises a tube (7), a rod (9) and an end piece (11). The rod is provided with projections (10) at least near one of its ends for cooperation with parts (13,14) with reduced diameter in the tube and end piece respectively. The part (13) in the tube limits the movement of the rod in a direction away from the end piece. The part (14) in the end piece limits the movement of the rod in a direction towards the end piece. All thread connections (12) between different sections of the drilling tool and between tube and end piece within each section are made in the same way and thus equally easy to break.

Abstract: Tunnel boring machine whose driving shaft (4) adjacent to the boring head (6) is journalled in a bearing (12) which is intended to take up only radial forces. Shaft (4) is at its other end journalled in bearings (13,14) which take up both radial and axial forces.

Abstract: Drill string component for top hammer drilling comprising a rod (13) surrounded by a tube packet (4,5). The rod is provided with a thickened section (14) for cooperation with a diameter reduction (15) in the tube packet which at upwards drilling is situated below the section (14). Through this flushing liquid is prevented from flowing out of the drill string when the drill string is extended.

Abstract: Device in hammer machines. The device comprises a machine housing (1) and a hammer piston (2) movable to-and-fro in the machine housing. A drilling tool connected to the machine housing comprises a drill bit (5), a set of tubes (4) for rotating the drill bit and a set of rods (3) for transferring impact energy to the drill bit. A rod (11) situated adjacent to the drill bit is provided with an axial channel (7) and a radial channel (8) for supplying flushing medium to the flushing channel (6) of the drill bit. The distance (S) from the front end (9) of the drill bit to channel (8) is larger than the length (L) of the hammer piston (2).

Abstract: Rock bolting device comprising a swingable bolting unit (2) which carries a conduit (4) for transport of hardenable mass to a drill hole (3). The conduit is surrounded by a tube (5) in which a thickened part (6) of the conduit is movable to-and-fro under sealing cooperation with the tube. Through this the conduit (4) can be fed towards or away from the mouth (7) of the drill hole (3).

Abstract: A lubricator intended to feed lubricant, by a short impulse, to a pressure fluid line each time that tapping of pressure fluid is started. In the lubricator, a pressure fluid valve (29) is provided which, after a delay of a fraction of a second, is opened for the passage of pressure fluid when tapping is started. During the delay, a pressure drop results on one side of a lubricant valve (23) while simultaneously a higher pressure prevails in a lubricant reservoir (39) and imposes a movement on the lubricant valve during which lubricant is discharged.

Abstract: An impulse motor for a hand held hammer machine comprises a housing (10) with a cylinder (11) therein, in which a reciprocating drive piston (40) via a gas cushion in a working chamber (44) of said cylinder (11) repeatedly drives a hammer piston (15) to impact on and to return from a tool (20) carried by the machine housing (10). The drive piston (40) has an axially protruding reduced diameter damping piston (50) thereon adapted to prevent piston encounter collision by arresting the return movement of said hammer piston (15) towards the drive piston (40) in a cooperating damping cylinder (51) provided on the hammer piston (15). The damping piston (50) has two diameterical steps (64,65) formed thereon, of which an outer step (64) is long and has a clearance relative to said damping cylinder (51) enabling during arresting a braking action therebetween by gas friction in said clearance.

Abstract: The improvement of the present invention provides a camper's compass having a plate or member, such as an arcuate bow, having a direction pointer, which is pivotably mounted over the compass housing in such as way that it can swing between a normal forward position in which the compass is oriented in the desired direction of travel, and a diametrically opposed or reverse position. By pivoting the arcuate bow or member from its forward position to its reverse position, the user can set the return direction to the point of departure on the compass. The direction of a reverse path back to his point of departure is readily determined without making any mathematical calculations or trying to use the orienting means of the compass in reverse positions. This simplified manner of setting a return path on the compass eliminates confusion which otherwise may occur and result in disorientation of a user in his attempt to return to his point of origin.

Abstract: The present invention provides method and apparatus for joining together two or more overlaying sheet formed metals, either metallic or non-metallic, in which a movable punch is moved towards a stationary die axially in a first direction and into a first position that is independent of the thickness or the number of sheet formed members to be joined together. Thereafter, an anvil is co-axially moved towards the die and into a second relative position that is also independent of the thickness or the number of sheet formed members to be joined together. The anvil is blocked in its second relative position by a blocking element, and a movable die is co-axially moved towards the anvil and into a third relative position that is dependent upon forces applied to the die and on the number, thickness and material of the sheet formed members to be joined together. As an alternative, the punch may be the stationary element, while the die is the movable element.

Abstract: Device for setting a rock bolt. The device is provided with a bolt magazine (6) arranged on a feed beam (1). Rock bolts (8) are transferred from the bolt magazine to the setting position in line with a hole drilled in the rock by means of a swingable arm (9) and displacement of a bolt setting machine (5).

Abstract: Tunnel boring machine for reaming of a pilot tunnel (11). The machine housing (12) is provided with a projecting part in front of the boring head (13), said projecting part comprising a part (20) being fixed relative to the machine housing and a shield (19) being separable from the fixed part.This arrangement permits substantially uninterrupted excavation of the tunnel and prevents the excavated soil from becoming wedged between the boring head and the tunnel front.

Abstract: Tunnel boring machine comprising a number of swingable arms (11,12,13,14) provided with boring tools (41,42,43,44) for the working of the tunnel wall outside its normal diameter. The arms may be swung outwardly into an active position or retracted into an inactive position. These tools may be independently actuated and facilitate the insertion of steel supporting arcs into the excavated area.

Abstract: A percussive machine comprises a housing (10) with a cylinder (11) therein, in which a reciprocating drive piston (40) via a gas cushion in a working chamber (44) repeatedly drives a hammer piston (15) to impact on the neck (17) of a tool (20) carried by the housing (10). At empty blows with the neck (17) out of reach, the hammer piston (15) is thrown forwardly and caught pneumatically in a braking chamber (47) at the bottom end (12) of the cylinder (11). The braking is combined with an elastic yielding of the bottom end (12) against the action of a recoil spring (23) in the housing (10). The pressure in the braking chamber (47) during such yielding is controlled by throttling apertures (48) in the cylinder (11) uncovered by the bottom end (12). The hammer piston (15) is thus checked to halt pneumatically by throttling avoiding a collision with the bottom end (12) and takes an inactive position below ports (46) in the cylinder wall through which the working chamber (44) is relieved and ventilated.

Abstract: A hand held hammer machine comprises a housing (10) with a cylinder (11) therein, in which a reciprocating drive piston (40) via a gas cushion in a working chamber (44) repeatedly drives a hammer piston (15) to impact on the neck (17) of a tool (20) carried by the machine housing (10) as soon as a feeding force is applied via the machine housing (10) to the tool (20) and an interposed recoil spring (23) pre-stressed between fixed shoulders (28,22) in the housing (10) starts being compressed in response to tool penetration into the housing (10). Therein and within the spring (23) and around the path of movement of a piston rod (13) of the hammer piston (15) is affixed one end (26) of a sleeve (25), which by its other end forms a stop (30) limiting the penetration of the tool neck (17) into the machine housing (10) to a maximally allowable extent.

Abstract: An impact motor comprises a housing (10) with a cylinder (11) therein, in which a reciprocating drive piston (40) via a gas cushion in a working chamber (44) of said cylinder (11) repeatedly drives a hammer piston (15) to impact on and to return from the neck (17) of a tool (20) carried by the machine housing (10). A piston groove (68) is provided adjacent to the front face (70) of the drive piston (40) and the peripheral part of said face (70) is rounded (71) towards said groove (68). A piston ring (41) is of steel having a temperature expansion coefficient substantially equal to the cylinder's (11) and is ground circumferentially to have a close sliding and sealing fit in the cylinder (11). The rounded (71) drive piston face (70) is adapted to the inner diameter of said ring (41) so as to permit the ring (41) to be forced into said groove (68) undeformed to ride on a elastically centering O-ring (69) of heat resistant rubber.

Abstract: A clamp for clamping blood vessels or aneurysms has a pair of operational arms and a corresponding pair of hemostatic ends for engaging a blood vessel or aneurysm. The operating arms are attached to each other, without pivot mounting, with a coil spring having at least one winding, by fixedly connecting each end of the coil spring to a different one of the operational arms. The coil spring biases the clamp so that the hemostatic ends of the clamp are opened when the operating arms of the clamp are moved apart from each other. In this manner, visual obstruction of the hemostatic ends of the clamp is significantly reduced during a clamping procedure, and the cost of manufacture of the clamp is reduced by elimination of pivot mounting of the clamp arms.

Abstract: The present invention provides a regulator for a refiner or grinding apparatus having opposed relatively rotatable grinding discs. Each grinding disc carries a grinding segment, and a predetermined gap or grinding space is defined between the grinding segments. The regulator, which is provided to compensate for axial variations in the predetermined grinding space due to variations of the load, includes a piston axially movable in a cylinder and a calibrated resilient element acting on the piston. The regulator is coupled to a hydraulic servo motor for the grinding discs, and the dimensions of the piston and cylinder of the regulator are selected to correspond to that of the servo motor, but in reduced scale. By calibrating the resilient element of the regulator to correspond to the axial load applied to the grinding discs, the displacement of the regulator piston corresponds to the relative displacement of the grinding disc and thus to a variation in the grinding space between the grinding discs.