A protected swivel has first and second members connected in swiveling engagement and a sleeve overlaying and enclosing at least a portion of each of the first and second members. The sleeve is coupled in sealing engagement with the first member to swivel with the first member. A first seal is interposed between the sleeve and the second member for sealing engagement of the sleeve with the first member. A second seal extends between the first member and the second member. The second seal may inc...

A power semiconductor device (P) has first and second main electrodes (D) and (S) for coupling a load (L) between first and second voltage supply lines (2 and 3), a control electrode (G) coupled to a control voltage supply line (4) and a sense electrode (S1) for providing in operation of the power semiconductor device (P) a current that flows between the first and sense electrodes (D and S1) and is indicative of the current that flows between the first and second main electrodes (D and S). A cur...

Means to release excessive pressure in a pressure vessel containing gas in which denser material is entrained. A separator is placed between a pressure release valve and the pressure vessel to separate the entrained material from the escaping gas and thereby protect the valve from damage.

A plural-phase rectifier having triggerable SCRs for rectification, with an oscillator energized from the output of the rectifier for triggering. A diode in each trigger lead with the cathode thereof connected to the trigger of the SCR to prevent inter-SCR triggering when the power supply is short-circuited. Under short-circuit the power supply ceases to operate within a fraction of a cycle of the alternating current being rectified.

Disclosed is a dynamic output buffer having a fault protected output. The circuit is integrated on a monolithic chip, and the output is protected for a specific duty cycle against short circuits to both substrate ground and to a high voltage.

In combination, a diked area in a body of water, a floating tank moored in the diked area for storing liquid of less density than the density of water, and a fixed roof on the tank.

A sealed Bourdon tube responsive to externally applied pressures for effecting displacement within operating ranges correlated to the magnitude of pressure being applied. Preconditioning of the Bourdon tube includes a permanent fluid fill with an incompressible liquid of controlled volume corresponding to the decreased internal tube volume when the tube is subject to application of a predetermined overpressure. The confined fluid thereafter presets an overload limit beyond which the tube cannot ...

A protected connector plug provided with a hollow, open-end housing; the open end is closed by a single, spring-loaded, slidable sheath surrounding both contact blades and having detents on it to engage a stop in the housing to retain the sheath in the housing. In one embodiment the detents are deflectable to allow the sheath to be inserted after the housing is otherwise complete. In another embodiment the sheath is properly placed within one half of the housing before the other half is joined t...

A cathodically protected metal article, such as a pipeline, tank, or vessel, is covered with a first coating of chlorinated rubber, and a second, outer coating of a bituminous material wherein either or both coatings contain dispersion of not less than 5 percent by weight of calcium carbonate. The thus coated article exhibits improved corrosion resistance.

A conveyor system having a protected belt driving element on which are mounted a plurality of load bearing elements which compliment one another to provide a protective surface shielding the driving element from conveyed material. The load bearing elements are mounted on the driving element in a spaced manner to essentially insulate the driving element from physical and thermal contact with the conveyed material. Hot loose materials and abrasives may advantageously be transported on this conveyo...