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 rel...

A supporting arrangement for a feed device for a drilling machine of a rock drilling unit (2) comprising a feed device (3) for a drilling machine (4), a cradle (5) supporting the feed device longitudinally displaceably and a supporting device (10) which is extendable in parallel with the feed device for supporting the feed device against a tunnel wall. The supporting device is supported by the cradle so that it remains stationary with respect to the cradle when the feed device is displaced.

A motor driven camera operating mechanism includes a current source, an electric drive motor and a reversible transmission coupling including a disengagable clutch coupling the motor to the film take-up, the shutter cocking mechanism and shutter release, the transmission being reversed upon a film increment advance and the shutter being released by the transmission reverse drive. There are provided a normally open manual first switch and three double throw switches, a second switch actuated by t...

A device for driving ground rods of the type to be mounted on a suitable carriage or vehicle. A boom to engage ground rods as the rods are driven is attached to an adjustable horizonal beam. The adjustable horizonal beam interconnects the boom with a vertical cylinder attached to a base. The base interlocks the entire device to the bed or frame of the carriage. The movement of the horizonal beam and rotation of the vertical cylinder combined as a means of positioning the boom relative to the car...

A camera housing defines a cavity for receiving a battery, and a door is movable between open and closed positions to provide access to the cavity. A pair of electrical contacts engage the battery, and a projection on the door moves a received battery relative to the contacts in response to movement of the door between its open and closed positions so as to provide rubbing engagement between the contacts and the battery.

The invention relates to a construction apparatus comprising a mast, a slide guided in a longitudinally displaceable manner on a front side of the mast, at least one drive chain for the slide arranged longitudinally to the mast and at least one drive pinion supported on the slide in a rotatable and drivable manner, which is engaged with the drive chain. Provision is made for the drive chain and the drive pinion to be arranged in front of the front side of the mast.

A connector assembly comprises a first connector, a second connector, at least one outer sliding element, at least one inner sliding element, a first shaft and a second shaft. The second connector is connected with the first connector by a signal cable, and the inner sliding element is relatively slid and rotated with the outer sliding element; the first shaft is rotatably and pivotally engaged with the first connector and the second shaft is rotatably and pivotally engaged with the second conne...

Vane pump (10) mechanical losses are reduced by removing vane friction losses and replacing them with lower magnitude journal bearing fluid film viscous drag losses. A freely rotating cam ring (70) is supported by a journal bearing (80). A relatively low sliding velocity is imposed between the cam ring and the vanes (26). This permits the use of less expensive and less brittle materials in the pump by allowing the pump to operate at much higher speeds without concern for exceeding vane tip veloc...

The mean for the universal serial bus hide and swing, its body inside have a sliding unit its head pivot to establish on can swing from as of deal with USB, and a memory to equip the electricity conjunction in deal with USB. The USB can conceal in the body, or along with the sliding unit to swing after being moved the indentation of the body.

A circuit for providing a pulsed signal to a driven device such as a tattoo imprinting machine wherein the pulse width and signal magnitude and frequency are controlled by the operator. A voltage controlled oscillator establishes the signal frequency, a variable impedance provides operator control of the signal magnitude and a foot-actuated switch enables the operator to control pulse width for intermittent operation. An adjustable frequency controller enables the operator to control the oscilla...