Abstract: An example plasma tool is configured to operate within a wellbore of a hydrocarbon-bearing rock formation. The plasma tool includes a laser head that includes one or more optical components. The laser head is configured to receive one or more laser beams at the one or more optical components and to output the one or more laser beams via the one or more optical components. The plasma tool includes a laser beam generator to generate the one or more laser beams. The laser beam is configured to induce a plasma in a volume of fluid. The plasma is for producing shock waves in the volume of fluid. The plasma tool includes a deformable acoustic mirror that confines the volume of fluid at least in part. The deformable acoustic mirror is configured to receive the shock waves to produce destructive reflected waves in the volume of fluid.

Abstract: A power lock system for stage truss towers for remotely locking a climbing truss sleeve block with its tower, thereby distributing the downward load directly into the tower and preventing upward motion. The power lock system for stage truss towers generally includes a remotely controlled locking mechanism that is mounted within a truss tower section with adjustable locations. The sleeve that slides or rolls up the tower is equipped with stirrups to provide a structural receptacle for the locking forks. The sleeve and the locking mechanism are equipped with sensors that indicate the sleeve is in the correct location for locking. The control system displays the status of the sensors and limit switches and uses logic to exercise the rules of operation.

Abstract: A lift car securing arrangement includes a restraining arrangement having a restraint that is supported by the lift car arranged such that it can be placed into and removed from restraining interaction with an extended stationary interaction element arranged to extend along the vertical pathway of the lift car, and which restraint when placed into restraining interaction locks the lift car to the stationary interaction element, a power-interruption device that can be placed into and removed from a power-interrupting position whereby the power to a driving motor unit that is part of the lift is interrupted when the power-interruption device is placed arranged in its power-interrupting position, in which the power-interruption device is so arranged at the restraining arrangement that the said power-interruption device is located in its power-interrupting position when the restraint has been set into restraining interaction with the extended stationary interaction element.

Abstract: The invention concerns an arrangement for securing a lift car (1) that is part of an electrically driven lift at a predetermined level for, for example, service or maintenance, and for preventing unintentional motion of the lift car secured in this manner, whereby the lift car may be of the type that is arranged with a cage or platform for the transport of persons or material.

Abstract: A double brake protection device for elevator is provided. The device comprises at least one of emergency means and electromagnetic means coupled to brake in order to effect a stepwise stopping procedure for preventing elevator from free falling after brake is released.

Abstract: A carriage for supporting an elevator car includes a drive unit, a spaced generally parallel support unit and a pair of lower yokes connecting the units. The carriage is movable along a pair of spaced apart generally vertical tracks. The drive unit includes a motor driving a drive axle with a respective drive wheel mounted at each end of the axle which wheels roll along the tracks. The support unit includes a support axle with a respective support wheel mounted at each end of the axle and a clamping device by which friction forces of the drive wheels and of the support wheels are produced on the tracks. The working range of the clamping device can be read off of an indicator. A respective immobilizing equipment is arranged at each side of the lower yoke by which the elevator car can be releasably connected with the track at a desired position along the travel path during assembly of the elevator system and/or during maintenance operations.