Hydraulic systems

These systems are derived from the nineteenth century but operate with electric motors and pressurized oil. The basic provision includes a telescopic hydraulic cylinder which is housed centrally below the car or on either side. The simplest arrangement is the central cylinder with a shaft drilled down into the subsoil. Alternatives involve single or double cylinders to one or both sides of the shaft. The advantages rest with the minimum loading on the building and with the fact that the machinery room can be at lowermost level and up to 15 m away from the shaft. The limitations are speed and duty loads, say 0.63 m per second for loads around 1 000 kg. They are ideal for low rise (up to six storey) with non-intensive use.

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