Scissor Lift

A Scissor Lift is a platform linked to a criss-cross type construction which moves vertically to achieve extra working height. The shape of the criss-cross pattern is known as a pantograph. The upward motion is achieved by applying pressure to the lowest set of supports, much like squeezing a pair of scissors; this elongates the pattern, propelling the platform upwards. The platform itself can also incorporate an extending bridge to gain further access to difficult work areas. The movement of the scissor action can be produced by a hydraulic system, but pneumatic systems are also common. Mechanical devices can also be employed such as the lead screw or rack and pinion applications. Although it requires a great deal of power to ascend the platform it requires virtually none to descend, it is merely a matter of releasing the power which was used to raise the platform. This is why these forms of power are preferred, as they give a smooth failsafe option for returning to ground level.