Abstract: A labyrinth cartridge seal having a shell and a plurality of sleeves having corresponding portions to prevent axial and radial movement therebetween and particularly a labyrinth cartridge seal for use in a compressor for compression of a gas, such as oxygen, which restricts leakage of pressurized gas to a drive mechanism such as an oil lubricated gear box, to thereby reduce the likelihood of explosions. In one embodiment, the labyrinth cartridge seal includes a shell comprising a passageway therethrough, and four spaced-apart, concentrically aligned sleeves, axially and radially supportable along the passageway and generally sealable with the shell to define three separate chambers around the shaft. The shell has three ports, each one opening onto a different one of the three separate chambers for venting or receiving a supply of buffering gas. Also disclosed is a compressor incorporating such a labyrinth cartridge seal.

Abstract: A flow controller for preventing damage to a rotating machine by automatically redirecting the flow of lubricating oil in and out of a shaft driven pump in the event the machine goes into reverse rotation. The controller contains sealing elements that are moved under the influence of oil moving through the flow controller.

Abstract: Apparatus for preventing damage to a machine in the event the machine inadvertently goes into reverse rotation. An automatically actuated flow controller is adapted to reroute the flow of lubricant to the primary pump when the machine rotates in a reverse direction thereby assuring that lubricant is supplied to the machine bearings, and the like, to prevent the machine from being damaged. The mechanism also has the ability to deliver a metered amount of lubricant to the main pump from an auxiliary pump to prime the main pump when the main pump is shut down thus allowing the main pump to be quickly brought on-line.

Abstract: Device in a hydraulic power system connected to load driving hydraulic motor (18; 32), comprising a pilot controlled flow regulating directional valve (1; 29) for alternative connection of the service ports of the motor (18; 32) to a pressure medium source and a tank. The directional valve (1; 29) comprises two opposite and by a pilot pressure activatable activating means (3, 4), and a pilot pressure means (84) is arranged to pressurize and activate the activating means (3, 4), alternatively, and drain one of the activating means to the tank through a flow restriction (6, 7) at activation of the other activating means (3, 4).

Abstract: The invention aims at bringing about a device for remote controlling of, for example, directional valves, which likewise allows a manual direct controlling, using a hand lever, for example. The control device includes a hydraulic cylinder (37) with ports (31,32) for feeding and evacuating, respectively, of hydraulic fluid, a piston (14) arranged in the cylinder (37), as well as a piston rod (13), for accomplishing the controlling function. The piston rod (13) is arranged to be slideably supported in the piston (14), allowing a limited movement of the piston rod (13) relative to the piston (14) independent of the pressure and load conditions in the cylinder (37), the movement possibility of the piston rod (13) being limited in at least one direction by a stop (17) arranged on the piston rod.

Abstract: Device in a hydraulic power system connected to a load driving hydraulic motor (18; 32), comprising a pilot controlled flow regulating directional valve (1; 29) for alternative connection of the service ports of the motor (18; 32) to a pressure medium source and a tank. The directional valve (1; 29) comprises two opposite and by a pilot pressure activatable activating means (3, 4), and a pilot pressure means (84) is arranged to pressurize and activate the activating means (3, 4), alternatively, and drain one of the activating means to the tank through a flow restriction (5, 7) at activation of the other activating means (3, 4).

Abstract: A rotary compressor being provided with a capacity regulation valve (16) at the outlet of the compressor. The valve is movable between a first position (18) in sealing cooperation with an end face (19) of the compressor rotor and a second position (20) creating a leakage path between the outlet opening (15) and the inlet opening (14) of the compressor.

Abstract: A method for positioning a number of working implements, for example spray nozzles, to certain working or treatment points on a car body as the latter is supported by an overhead conveyor for travel between different working and assembly stations on a production line. A vertically movable base structure is provided and a working implement carrying frame is movably supported on the base structure. Hydraulic jacks on the base structure are arranged to accomplish a vertical parallel movement of the frame up toward the underside of the car body until one of four contact sensors indicates contact with the latter. A final vertical adjustment of the frame is accomplished by four vertical cylinders which raise the frame in a non-parallel movement until at least three of the four contact sensors indicate contact with the car body. The docking of the frame to the car body is completed by activating two expandable dowels which are introduced into openings in the car body bottom shell.

Abstract: A method and apparatus for insulating a spray liquid source from the high tension voltage of an electrostatic spray gun (13) when using an electrically conductive spray liquid. A spray liquid supply line (12) couples the spray liquid source to the spray gun and comprises an insulating device (14) in the form of a closed vessel (16; 26; 36) containing an electrically non-conductive liquid which is not mixable with the spray liquid and which has a density different from that of the spray liquid. A sprinkler nozzle (21; 31; 41) is arranged to disintegrate the spray liquid into separated drops which are transported through the insulating liquid (17; 27; 35) in the closed vessel at least by the influence of the difference in gravity acting on the two liquids. The separated spray liquid drops form a discontinuation of the electrical lead through which the high tension voltage propagates upstream through the supply line.

Abstract: A hydraulic torque impulse generator comprises a drive member (10) connected to a rotation motor and including a cylindrical fluid chamber (12) partly defined by a circumferential wall (14), and an output spindle (13) rotatably supported in coaxial relationship with the drive member (10) and having a rear portion (15) extending into the fluid chamber (12). The rear spindle portion (15) has two radial slots (18, 19) each supporting a radially movable seal element (21, 22) for sealing cooperation with seal lands (23, 24) on the fluid chamber wall (14). First seal ridges (25, 26) are provided on the rear spindle portion (15) for sealing cooperation with second seal ridges (28, 29) on the fluid chamber wall (14), thereby dividing the fluid chamber (12) into two high pressure compartments (H.P.) and two low pressure compartments (L.P.) during two short intervals of each revolution of the drive member (10) relative to the output spindle (13).

Abstract: Apparatus for automatically monitoring and adjusting the axial thrust acting upon the rotor assembly of a rotating machine having an adjustable balancing mechanism for balancing the axial load acting thereon. A pair of surfaces on the rotor structure and a pair of flow circuits are arranged to direct a pressurized fluid against each surface. The back pressure is each circuit is monitored to determine when the axial forces are unbalanced and the data applied to a control mechanism for automatically balancing the axial forces acting on the rotor structure.

Abstract: A device for insulating the spray liquid source from the high tension voltage of an electrostatic spray system when using an electrically conductive spray liquid. The device comprises a spray gun (13), a supply line (12) which connects the spray gun (13) to a spray liquid reservoir (10) and which includes a vessel (16) containing a barrier forming liquid (17) of low electrical conductivity and a density other than that of the spray liquid. The vessel (16), which is substantially non-conductive is connected at its inlet end (24) to ground potential and at its outlet end (19) to the same high potential as the spray gun (13). An electrode means (22; 25) is provided in the vessel (16) to expose the spray liquid passing through the vessel (16) to at least one intermediate potential for controlling the tension gradient in the barrier forming liquid by limiting and controlling the charging of the spray liquid.

Abstract: A power tool for two step tightening of screw joints comprising a housing (10; 50), a rotation motor supported in said housing (10; 50), an output spindle (13, 54) rotated by said motor and connectable to a screw joint to be tightened, a power transmission including a clutch means (16-18, 25; 58, 60, 67) incorporated between said motor and said output spindle (13; 54), and power supply means connecting said motor to a power source.

Abstract: A device for positioning a number of working implements, for example spray nozzles, to certain working or treatment point on a car body as the latter is supported by an overhead conveyor for travel between different working and assembly stations on a production line. The device comprises a vertically movable base structure and a working implement carrying frame movably supported on the base structure. Hydraulic jacks on the base structure are arranged to accomplish a vertical parallel movement of the frame up towad the underside of the car body until one of four contact sensors indicate contact with the later. A final vertical adjustment of the frame is accomplished by four vertical cylinders which raise the frame in a non-parallel movement until at least three of the four contact sensors indicate contact with the car body. The docking of the frame to the car body is completed by activating two expandable dowels which are introduced into openings in the car body bottom shell.

Abstract: Damping device for a percussion rock drilling machine. A damper piston (22) and a compressed air cushion in a damping chamber (23) transfer feeding force from the drill machine housing (11) to the drill string (15). A venting valve (51) is arranged for venting the damping chamber (23) after which the damping chamber can be pressurized with a selectable pressure.

Abstract: A hydraulic torque impulse generator comprising a rotationally driven drive member (10; 50), a hydraulic fluid chamber (16; 51) confined in the drive member (10; 50), an output spindle (18; 53) having a rear impulse receiving portion (17; 52) extending into the fluid chamber (16; 51), at least two radially slidable vanes (23, 24; 58, 60) carried by the rear spindle portion (17; 52) and cooperating with corresponding seal portions (25, 26; 62, 63, 64) on the fluid chamber wall, axially extending seal ribs (29, 30; 65, 66, 67) on the fluid chamber wall and corresponding axially extending seal ribs (27, 28; 68, 70) on the rear spindle portion (17; 52). Simultaneous sealing cooperation is obtained more than once during each revolution of the drive member (10; 50) relative to the output spindle (18; 52), whereby the fluid chamber (16; 51) is momentarily divided into at least two high pressure compartments (H.P.) and at least two low pressure compartments (L.P.).

Abstract: A hydraulic drive system for one or more hydraulic motors, comprising a pump (1), a tank (25) for hydraulic fluid, one or more control valve sections (10, 11, 12) each being provided with a shunt passage and each being coupled to a respective hydraulic motor, a first shunt conduit (4) including the shunt passages of said control valve sections (10, 11, 12) connected in series for leading off of the tank (25) the temporarly surplus flow of hydraulic fluid from the pump (1), and a feed conduit (3) for connecting the control valve sections (10, 11, 12) in parallel to the pump (1).

Abstract: A screw joint tightening power tool including a torque limiting device and a rotation motor which via a planetary reduction gear (13) is arranged to deliver a torque to an output spindle (14). A torque responsive release clutch (22, 26, 27) is associated with the planetary gear (13) in order to maximize the output torque of the tool. The ring gear (20) of the planetary reduction gear (13) is rotatably as well as axially movable in the housing (10) and forms together with the housing (10) a torque responsive release clutch which is arranged to transfer a reaction torque from the planetary gear (13) to the housing up to a level determined by the axial bias force provided by a spring (28) acting on the ring gear (20). The release clutch comprises a cam (22, 26) for axially displacing the ring gear (20) against the action of said spring (28) upon rotation of the ring gear (20) relative to said housing (10) as a certain reaction torque level is exceeded.