Abstract: A device comprising a housing having a longitudinal dimension; a linear actuator including a casing coupled to the housing; an actuator shaft having an exterior surface and configured to be longitudinally translated relative to the casing; and a seal assembly engaging the housing and sealingly engaging the exterior surface. The device also comprising a motor assembly disposed within the housing, the motor assembly including a motor case and a motor shaft, the motor shaft configured to rotate one of the seal assembly or the actuator shaft.

Abstract: A machine and a method for earth-working with a machine, having a mast, along which a top drive can be moved vertically by an adjusting device, through which top drive a telescopic kelly bar is displaceably guided, which has at least one outer kelly bar, which is designed to come to lie on the top drive, and one inner kelly bar, which comprises a rope suspension for a rope, through which the inner kelly bar is moved vertically by a rope winch. The adjusting device for the top drive and/or the main rope winch for the kelly bar is/are automatically controlled, wherein the inner kelly bar is moved relative to the top drive in some areas in a rapid travel mode at a first speed and in some areas in a conservative travel mode, in which the speed is reduced in comparison with the first speed.

Abstract: A detachable and combined drive key of a power head of a rotary drilling rig is provided. The drive key includes torque transfer keys and a pressure transfer key. Each torque transfer key is respectively assembled on a key groove on an inner wall of the drive sleeve. The pressure transfer key is assembled at a bottom of a drive sleeve and includes a circular ring structure and a plurality of pressure pads. Each pressure pad has a width less than the torque transfer key. A central surface of each pressure pad is aligned with a central surface of each torque transfer key. The drive sleeve, the torque transfer keys, and the pressure transfer key are combined to form an integrated drive key with a same circular cross-section.

Abstract: A driving head for telescopic drill rods has a frame, a cylindrical collar rotatably coupled with said frame, and provided at least with one internal surface comprising at least one driving rack adapted to be coupled with corresponding driven racks of telescopic drill rods, and actual Oil means to drive said cylindrical collar into rotation, said driving rack being coupled with said cylindrical collar by means of removable connection means. A machine provided with said driving head is also disclosed.

Abstract: The present invention includes a section (102) for generating a plurality of contributing random numbers using a random number, a section (110) for generating a plurality of contributing data using a plurality of contributing random numbers, a section (103) for selecting a number designating contributing data, a section (104) for generating a commitment of the number, a section (126) for saving a contributing random number of the number and disclosure information of the commitment, a section (125) for sending the plurality of contributing data and the commitment, section (134) for generating auxiliary data using a contributing data set and the contributing random number, wherein the auxiliary data and the disclosure information of the commitment are sent from the section (125), and a section (139) for generating a shared key using the contributing data set, the disclosure information of the commitment, the auxiliary data, and the contributing random number.

Abstract: Disclosed is a downloadable conditional access system (DCAS) including a key request unit to transmit a key request message to an authentication server, an authentication request unit to request authentication from the authentication server based on a key response message received from the authentication server in response to the key request message, and a session establishment unit to establish a session with the authentication server, based on an authentication response message received in response to the authentication request.

Abstract: An excavating screw unit equipped with a hydraulic excavating auxiliary blades has developed for an auger crane, comprising: an extension unit having auxiliary excavating blade, cylinder mounting hole, built-in fluid passages in extension unit, hydraulic cylinder, piston, and extension guiding rods; an excavation column formed a hollow center of a square-shaped to mount on top of extension unit; an extension rod having an outer square-shape to fit into the excavation column, a built-in hydraulic passages in the extension rod, at top portion of the extension rod, an inlet and outlet that is bent right angle at top portion of the hydraulic passages to connect to hydraulic tubes, the extension rod is sliding to extend or retract through the excavation column. The extended excavating auxiliary blades are maintained by the pressurized fluid to prevent retracting by digging resistance during the excavating. Thus, this mechanized excavating device is easily digging a burial hole for a utility pole and underbracing.

Abstract: A mole launcher which has a hydraulically powered, double-acting piston and cylinder unit to push or pull a slider. The slider carries a drill head connected to a drill string. The other end of the drill string carries a mole to bore an underground passage. By releasably locking the slider to the front of the launcher, the cylinder can be moved between a first position in which it projects beyond the chassis of the launcher, and a second position in which it is placed only within the length of the chassis. Thus, the mole launcher is considerably shorter in its transportation state than in its operating state.

Abstract: A hydraulic motor is mounted on top of a hydraulic cylinder barrel. The barrel houses a drive shaft that is rotated by the motor. A male hex drive shaft, attached to the drive shaft, extends downward through the barrel. A piston is mounted within the barrel and moves linearly along the male hex drive shaft. Attached to the piston is a piston rod having an upper portion, a center portion, and a lower portion. The center portion defines a rod chamber for accommodating the male hex drive shaft as the piston and the piston rod move upward. The upper portion has a hexagonal inner surface for rotation and sliding movement along the male hex drive shaft. A passage through the center portion allows fluid to flow between the rod chamber and the upper chamber of the cylinder barrel.

Abstract: A hydraulic earth boring machine for forming conduit passageways beneath established surfaces such as roadways, walkways, or the like. The boring machine includes a hydraulic cylinder having an open axial passageway for receiving a boring shaft. A drive cylinder surrounds the boring shaft and is driven by the hydraulic cylinder. A gripping assembly is mounted upon a trailing end of the drive cylinder and selectively couples the drive cylinder to the boring shaft. An elevating and vertical aiming assembly is mounted upon the hydraulic cylinder for facilely providing positioning of the boring machine, in situ, within an earth trench. In addition, an axial bracing and horizontal angling assembly is mounted upon the cylinder for mounting the boring machine within the trench adjacent an established surface.

Abstract: A hydraulic mast digger has a kelly head with improved retaining and sealing features. The digger is of the type having a kelly with a bearing assembly mounted between the kelly and a bearing sleeve. The bearing sleeve is reciprocally carried in the hydraulic cylinder and moves in response to hydraulic fluid pressure. The bearing assembly allows rotation of the kelly with respect to the bearing sleeve. A cap is secured by threads to the bearing sleeve above the top of the kelly to define a piston. The cap has an upwardly facing shoulder located below the upper edge of the bearing sleeve. A retainer is rigidly secured to the cap and extends down into the space between the cap and bearing sleeve. A locking device locks the retainer to the bearing sleeve. Preferably the locking device includes a key that fits within slots formed on the retainer and bearing sleeve. A primary seal encircles the retainer.

Abstract: A diametrically compact tunneling machine for boring tunnels is disclosed. The machine includes a tubular support frame having a hollow piston mounted therein which is movable from a retracted position in the support frame to an extended position. A drive shaft is rotatably mounted in the hollow piston and carries a cutter head at one end. The hollow piston is restrained against rotational movement relative to the support frame and the drive shaft is constrained against longitudinal movement relative to the hollow piston. A plurality of radially extendible feet project from the support frame to the tunnel wall to grip the tunnel wall during a tunneling operation wherein the hollow piston is driven forwardly so that the cutter head works on the tunnel face.

Abstract: In an apparatus for drilling long holes in the surface of a rock bed for installation of roof bolts where the working distance perpendicular to the surface is limited, a flexible, segmented shaft drill string is fed along a curved path to a mechanism positioned directly under the working surface. The mechanism straightens the drill string perpendicular to the surface, and supplies torque and thrust to the string to drill the holes. Since torque and thrust are supplied to only the straightened portion of the drill string, rather than to the curved portion, greater thrust is imparted to the drill head with minimum wear of the segments. A special guide sleeve, mounted to a rigid starter section of the drill string behind the head, guides the string along a straight path in the rock.

Abstract: A uniquely integrated arrangement of concentric tubes in combination with concentric pistons and special interconnecting fluid pressure passages therein, said component members cooperating in a manner as to permit extreme compound extension or retraction, while special cross-section configuration allows efficient transmission of axial torque energy without slippage between collinear members, so that when driven as a Kelly drive for earth drilling the torque is transmitted to a drilling auger.