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A scissors mechanism uses linked, folding supports in a criss-cross 'X' pattern. [1] The scissor mechanism is a mechanical linkage system used to create vertical motion or extension. It consists of a series of interconnected, folding supports that resemble the shape of a pair of scissors, hence its name.
A mechanical lever frame is designed to harness mechanical advantage to operate switch points, signals or both under the protection of the interlocking logic. The levers are connected to field appliances via solid pipes or taut wires such that the full travel of the lever will reliably cause full travel in the appliance.
From here, the word was 'applied to things which in some way take the place of a lad or man, or save human labour'. The first attestation in the Oxford English Dictionary of jack in the sense 'a machine, usually portable, for lifting heavy weights by force acting from below' is from 1679, referring to 'an Engine used for the removing and ...
Hand crank for a winch on a sailboat - commonly referred to as a winch handle. A crank is an arm attached at a right angle to a rotating shaft by which circular motion is imparted to or received from the shaft.
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The noun scissors is treated as a plural noun, and therefore takes a plural verb (e.g., these scissors are). [1] Alternatively, the tool is referred to by the singular phrase a pair of scissors. [2] The word shears is used to describe similar instruments that are larger in size and for heavier cutting. [3]
The main intent of this design was to halve the production cost of the Model F. [13] The most well known full-size Model M is known officially as the IBM Enhanced Keyboard. A classic full-size Model M keyboard with Spanish ISO key layout. In 1993, two years after spawning Lexmark, IBM transferred its keyboard operations to the daughter company.
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