A scissors mechanism uses linked, folding supports in a criss-cross 'X' pattern.

Workings

Extension is achieved by applying pressure to the outside of a set of supports located at one end of the mechanism, elongating the crossing pattern. This can be achieved through hydraulic,

pneumatic Pneumatics (from Greek ‘wind, breath’) is a branch of engineering that makes use of gas or pressurized air. Pneumatic systems used in Industrial sector, industry are commonly powered by compressed air or compressed inert gases. A central ...

, mechanical or simply muscular means. It may require no power to return to its original position, but simply a release of the original pressure. Also used in kinematics of mechanisms

Uses

This mechanism is used in devices such as lift tables and scissor lifts. Modern low-profile computer keyboards make an extensive use of it as well, installing each key on a scissor support to ensure their smooth vertical movement, allowing the use of a cheap and reliable rubber dome contact set, instead of expensive and complex array of mechanical switches.

References

Mechanisms (engineering) {{technology-stub

Workings

Uses

See also

References