Abstract: A hoist having a worm safety device in which the worm is continuously meshed with a worm wheel coupled to the drum. The worm is accelerated to a speed greater than that of the worm wheel and at a torque sufficient to overcome the frictional contact between the worm and worm wheel when the hoist direction is reversed.

Abstract: The safety system in a hoist having a motor with a motor shaft, a gear reduction unit, a drum, a safety brake drivingly coupled on an operating element on or close to the drum in which a mechanical out-of-sync detector produces a unidirectional brake-setting output from inputs from the drum and the motor shaft, the unidirectional brake-setting rotational output for setting the brake. In a preferred embodiment, an error correction is made into the detector for obtaining a first unidirectional output during normal operation, and the brake-setting unidirectional rotation is in the opposite direction for setting the brake. One form of detector is a mechanical differential assembly and another form of detector is a set of coaxial shafts that measure differential rotation between the drum and motor input shafts. A unique brake actuator is provided and is easily reset remotely after the brake has been set.

Abstract: Through dual push-pull cables, two-dimensional positioning motions and accompanying forces of an actuator device, such as a motor truck gear shift lever, are transmitted to a remote actuated device, such as the gear selector and shifter mechanism in the truck transmission. Interconnected by the cables, matched motion translators in master and slave units are rotationally and translationally guided in their respective units so as to transform two-dimensionally defined actuator motion applied to the master unit into motion components for transmission by the dual connecting cables to the slave unit, where the lineal cable motions are transformed back into a duplication of the actuator motion with accompanying forces effective to selectively operate the actuated device connected to the slave unit translator member.

Abstract: A combination venting and antipollution device for a shipboard liquid storage tank. A closure wall divides the vent conduit into a lower tank chamber in direct communication with the tank and an upper vent space in direct communication with the vent opening. A spring-urged valve closure member opens or closes an opening through the closure wall. Low pressure in the tank moves the valve closure member down into a lower open position, to admit air or other fluid to the tank; high pressure in the tank moves the valve closure member up into an upper open position to vent air from the tank. A hydrostatic pressure chamber open to the atmosphere houses a sealed bellows, and a spill-lock valve secured to the bellows normally opens to the vent a spill-lock chamber on the vent side of the valve closure member.

Abstract: A valve unit for installation in a vent to atmosphere from an upper end of a shipboard storage tank for liquids. The valve has a housing with a closure seat, a normally open closure member, and an actuator for automatically closing the closure member against the seat to prevent the passage of liquids out from the tank if and when the ship sinks. The actuator includes a sealed reference chamber and a restricted orifice leading into a housing surrounding the sealed chamber, so that if the ship sinks, water enters the orifice, fills the housing around the sealed chamber and exerts pressure substantially greater than that inside the sealed reference chamber. A trigger is actuated by movement resulting from the pressure in the housing exceeding that inside the reference chamber. The invention also provides for a safety by-pass. A by-pass conduit leads around the closure seat, and a relief valve in the by-pass conduit opens only when the pressure in the main valve, i.e.