Abstract: A hands free camera carrier includes a shoulder harness, a camera platform with an upper platform rotatably attached to a lower platform, and a coupler that attaches the shoulder harness to the camera platform.

Abstract: Wellhead apparatus is shown to comprise a casing hanger releasably latched to a running tool for lowering, landing and locking within the bore of a housing so as to suspend an inner casing which is suspended from the hanger within an outer casing string to which the housing is connected. The hanger includes a mandrel carrying a lock ring for locking in a recess in the housing bore, and a seal sleeve is carried by the mandrel for movement between an upper position to permit cement to be circulated through a space between the mandrel and a lower position closing the space. The tool includes a body carrying a latch ring which is held within a groove in the bore of the mandrel as the hanger is lowered and locked within the housing bore, and which may be actuated to lower the sleeve into sealed position and release the latch ring for retrieval of the tool, from the hanger within the well bore.

Abstract: A shoulder carrier for a camera, such as a video camera, is provided which positions the camera with its viewfinder adjacent the viewer's eye without the necessity for additional support. The shoulder carrier includes a shoulder harness including a pair of spaced-apart shoulder supports and at least one securement bar interconnecting the supports, a camera mount including a platform and a camera release, and a coupler interconnecting the platform with the shoulder harness for adjustably orienting the camera mount, and thus a camera carried thereon, relative to the shoulder harness. A belt is provided which connects front and back regions of the shoulder supports and connects across the chest area of the wearer. The belt aids in inhibiting the shoulder support from inadvertently disengaging and falling from the wearer, which would result in damage to the camera, thereby freeing the wearer's hands from holding the camera during use.

Abstract: A pneumatic or hydraulic pressure sensitive safety switch circuit which transmits an impulse from a sensor to a distant electrical switch, via an operating fluid, to activate the electrical switch. The electrical switch may be a disabling switch for a dangerous machine from which sensed objects are to be protected. Check valves located in the conduits communicating between the sensors and the actuators for the electric switch allow the disabling switch to be quickly actuated, but prevent re-entry of the operating fluid into the sensor means to deactuate the disabling switch until a short time interval has elapsed. The safety switch thus is quickly actuated and slowly deactuated.

Abstract: A motor brake control system for use on a motor having a motor brake retarder and a throttle fuel control is designed to respond to manual selection for sequentially retarding the selected cylinders in the motor. A transducer for sensing the speed of the motor is provided for generating a series of output pulses which access a high RPM detector and a low RPM detector. In the event that the motor exceeds a predetermined high RPM value, the brake control system activates all of the retarders to fully brake the motor. In the event that the brake retarders are on, either fully or partially, and the motor drops below a predetermined low RPM value, the brake retarders are released. Provision is made to prevent retardation of the motor as long as the throttle of the motor is being activated and retardation is further prevented after deactivation of the throttle until the fuel in the fuel delivery system has been consumed.

Abstract: A motor brake control system for use on a motor having a motor brake retarder and a throttle fuel control is designed to respond to manual selection for sequentially retarding the selected cylinders in the motor. A transducer for sensing the speed of the motor is provided for generating a series of output pulses which access a high RPM detector and a low RPM detector. In the event that the motor exceeds a predetermined high RPM value, the brake control system activates all of the retarders to fully brake the motor. In the event that the brake retarders are on, either fully or partially, and the motor drops below a predetermined low RPM value, the brake retarders are released. Provision is made to prevent retardation of the motor as long as the throttle of the motor is being activated and retardation is further provided after deactivation of the throttle until the fuel in the fuel delivery system has been consumed.

Abstract: An abrading belt runs on rolls one of which is on a yoke. A cylinder of a fluid actuator is fastened to the yoke and opposite sides of a piston in the cylinder are sequentially pressurized to cause the yoke to angulate back and forth for shifting the belt between lateral limits. A fluidic logic oscillator circuit is controlled by lateral limit sensors to switch the cylinder pressures. A lead screw couples the piston to a nominally fixed threaded element and a splined shaft connects the piston to a reversible motor. A time interval is initiated when the belt changes directions and if it expires before the next lateral limit is reached a signal is developed which causes the motor to shift the piston to thereby change the rocking angle of the yoke in one direction so the lateral travel times of the belt will become equal.

Abstract: A slag removing machine includes a conveyor movable generally vertically on a parallelogram linkage. The conveyor carries steel slabs below a fixed vertical sanding belt surfacing unit. The conveyor is supported on air bags.

Abstract: A motor brake control system for use on a motor having a motor brake retarder and a throttle fuel control is designed to respond to manual selection for sequentially retarding the selected cylinders in the motor. A transducer for sensing the speed of the motor is provided for generating a series of output pulses which access a high RPM detector and a low RPM detector. In the event that the motor exceeds a predetermined high RPM value, the brake control system activates all of the retarders to fully brake the motor. In the event that the brake retarders are on, either fully or partially, and the motor drops below a predetermined low RPM value, the brake retarders are released. Provision is made to prevent retardation of the motor as long as the throttle of the motor is being activated and retardation is further prevented after deactivation of the throttle until the fuel in the fuel delivery system has been consumed.