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An important specification used by stair lift manufacturers in Europe was British Standard BS 5776: 1996 Specification For Powered Stair lifts, produced by The British Standards Institution. [4] It has since been replaced by BS EN 81-22:2021: Safety rules for the construction and installation of lifts.' [5]
A simple dumbwaiter is a movable frame in a shaft, dropped by a rope on a pulley, guided by rails; most dumbwaiters have a shaft, cart, and capacity smaller than those of passenger elevators, usually 45 to 450 kg (100 to 992 lbs.) [2] Before electric motors were added in the 1920s, dumbwaiters were controlled manually by ropes on pulleys.
Belts are looped over pulleys and may have a twist between the pulleys, and the shafts need not be parallel. In a two pulley system, the belt can either drive the pulleys normally in one direction (the same if on parallel shafts), or the belt may be crossed, so that the direction of the driven shaft is reversed (the opposite direction to the ...
A dumb pulley can lift very large masses a short distance. It consists of two fixed pulleys of unequal radii that are attached to each other and rotate together, a single pulley bearing the load, and an endless rope looped around the pulleys. To avoid slippage, the rope is usually replaced by a chain, and the connected pulleys by sprockets.
Elwood Edwards, who lent his voice to AOL's "You've Got Mail," passed away Tuesday at the age of 74, according to his former employer WKYC.
Lift slab construction (also called the Youtz-Slick Method) is a method of constructing concrete buildings by casting the floor or roof slab on top of the previous slab and then raising (jacking) the slab up with hydraulic jacks. This method of construction allows for a large portion of the work to be completed at ground level, negating the ...
A former sheriff's deputy who gunned down Sonya Massey in her kitchen after she called 911 about a possible prowler outside her home will be released soon with conditions, an Illinois court ruled ...
The 10 best holiday candles to make your home smell merry and bright