Home > Materials Specifications

Lifts, Types of Lifts

Er. Parbhakar Dwivedi
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Lifts are installed into building to satisfy the vertical transportation needs of its occupants and visitors and are necessary by virtue of human comfort and convenience, or by statutory regulations. In offices and other commercial buildings, lifts are installed to aid efficiency by saving occupants time, and hence money. In residential towers, it is recommended that a lift be installed in all residences where there are four or more storeys, and that two lifts be installed where a building contains more than six storeys.

The increase in the numbers of high and medium rise building since the Second World War has been a challenge to the lift industry. The last three decades have seen the acceptance of automatic cars and the introduction of better control systems. Similar improvements have occurred in the engineering of lift systems. However, little change has occurred in the methods of traffic analysis and design.

Types of lifts

There are four main type of lifts. Namely passenger, goods, hospital, and service lifts.

a. Passenger lifts are those designed primarily for passengers. For designing these lifts, human comfort and convenience are given primary considerations. These are available in car sizes to accommodate 4, 6, 8, 10, 13, 16 and 20 passengers Weight of each passenger is taken as 68 kg. The standard speeds are 0.7, 1.00, 1.50, 1.75, 2.50, 3.00 m/s at present in India.

b. Goods lifts are mainly for the transport of materials, but may be required occasionally to carry passengers. These are available for standard loading of 500, 1000, 1500, 2000, 3000, 4000 and 5000 kg and speed of 0.25 to 1.00 m sec.

c. Hospital lifts are installed in hospital/dispensary/clinic and designed to accommodate one number bed/stretcher along its depth, with sufficient space all round to carry a minimum of three attendants in addition to lift operator three are available in standard loading of 15, 20 and 26 persons and speed of 0.5 to 1.50 m/s. for high speed micro self levelling is preferable as this ensures safe movement of beds, stretchers, x-ray and other heavy equipment.

d. Service lifts (dumb-waiter) are those lifts, which are exclusively used for carrying materials, and shall not carry any person. Its car area does not exceed 1 m. Total inside height and capacity also does not exceed 1.25 m and 250 kg respectively. These are available in speeds from 0.25 to 0.5 m/s. These are mainly used in hotels and restaurants for service from kitchen to the dining rooms, in banks for transport of bullion and in libraries for transport of books.

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