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A Murphy bed (also known as a pull-down bed, fold-down bed, or wall bed) is a bed that is hinged at one end to store vertically against the wall, or inside a closet or cabinet. Since they often can be used as both a bed or a closet, Murphy beds are multifunctional furniture .
Another structural difference is the sliding back mechanism (sometimes called wall hugger or wall climber) which allows to minimise the gap with the back wall when the bed is uplifted, keeps the bedside table within reach, and enables the partners using the bed (if split) to keep eye contact at all times. In the 90's the sliding back mechanism ...
The rotating wall technique (RW technique) is a method used to compress a single-component plasma (a cold dense gas of charged particles) confined in an electromagnetic trap. It is one of many scientific and technological applications that rely on storing charged particles in vacuum.
A rack and pinion has roughly the same purpose as a worm gear with a rack replacing the gear, in that both convert torque to linear force. However the rack and pinion generally provides higher linear speed — since a full turn of the pinion displaces the rack by an amount equal to the pinion's pitch circle whereas a full rotation of the worm screw only displaces the rack by one tooth width.
Studies suggest that adjustable-firmness beds are better for back pain. [26] Adjustable-firmness mattresses for medical use have special control mechanisms. In the 1990s self-adjusting air beds that automatically change their pressure periodically, or inflate and deflate several air chambers alternately, were introduced.
The Antikythera mechanism, dated to around 200 BC, [25] [26] used a crank as a part of its mechanism. [27] The crank was used to manually setup the starting date for a prediction. [28] [29] Hierapolis sawmill (3rd century AD), a machine that combine a crank with a connecting rod. [30]