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Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
An elevator (American English) or lift (Commonwealth English) is a machine that vertically transports people or freight between levels. They are typically powered by electric motors that drive traction cables and counterweight systems such as a hoist, although some pump hydraulic fluid to raise a cylindrical piston like a jack.
U.S. patent 3,196,296 — Electric generator (1965-07-20) Historically, numerous patents have been granted for various applications of the effect, including electrostatic dust precipitation, air ionizers, and flight. U.S. patent 3,120,363 was granted to G.E. Hagen in 1964 for apparatus more or less identical to the later so-called 'lifter' devices.
I is the electric current. d is the air gap. k is the ion mobility of the working fluid, [19] expressed in A⋅s 2 ⋅kg −1 in SI units, but more commonly expressed with the unit m 2 ⋅V −1 ⋅s −1. A typical value for air at surface pressure and temperature is 1.5 × 10 −4 m 2 ⋅V −1 ⋅s −1). [19]
A patient lift (patient hoist, jack hoist, Hoyer lift, or hydraulic lift) may be either a sling lift or a sit-to-stand lift.This is an assistive device that allows patients in hospitals and nursing homes and people receiving home health care to be transferred between a bed and a chair or other similar resting places, by the use of electrical or hydraulic power.
Thomas Townsend Brown (March 18, 1905 – October 27, 1985) [1] was an American inventor whose research into odd electrical effects led him to believe he had discovered a type of anti-gravity caused by strong electric fields.