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How does a Platform Lift work?

Have you ever wondered what makes a platform lift go up and down? It's actually not as simple as you may think, as there are three main types of platform lift drive systems, each having their own advantages and disadvantages.

Most modern platform lifts are controlled with electrical inputs from the call buttons. These send signals to a central processor unit which initiate motors or pumps as required.

Screw and nut drive system

The first drive system we'll look at is the screw and nut system. This works by utilising a steel screw pole which runs the full length of the shaft. A drive nut on the screw is attached to a motor on the platform. The motor turns the nut and depending on the direction of rotation the lift will go either up or down.

The installation of this system often requires a supporting wall especially on longer travel lifts in order to stabilise the unit. This system requires routine lubrication of the thread, often done by a self lubricating system. The disadvantages of this system are the wear and tear on the thread of the screw and drive nut. It is usually only possible to glaze three sides of the lift shaft due to one wall being used to conceal the screw thread.

Hydraulic drive system

The next drive system to look at is the hydraulic drive system. In this system, the lift platform is attached to a hydraulic ram. To move the lift, hydraulic fluid is pushed via a pump from a central reservoir into the ram. The ram extends and the lift rises, to lower the lift, the flow is reversed.

The disadvantages of this system are that there is an additional space requirement for a pump and reservoir unit, and also that hydraulic fluid can sometimes give off an odour in hot weather.

Encapsulated chain drive system

The final form of drive system we'll look at is the encapsulated drive system. The key part of this system is the chain which is encased in a highly durable polyurethane plastic casing which guides the chain and ensures that slippage is virtually impossible.

A motor and gearbox at top of the shaft turns a driveshaft that the chains are attached to. The chains are attached to either side of the platform. As the driveshaft rotates the chains are either pulled or pushed and hence the platform moves upwards or downwards. The advantage of this system is that its durability allows the lift installer to offer a much longer guarantee on the drive system. It's also possible to glaze all 4 sides of shaft as chains run in the corners of the shaft.

About the author

This article was written by Craig Merry, Director at Invalifts. Invalifts specialise in platform lifts for homes and offices. For further information on their product range, please visit or for enquiries and advice, you can call them on 0845 468 2543.

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About Invalifts

We are a UK based company who specialise in the provision and installation of inclined and vertical platform lifts in both public and domestic environments. We have solutions available which can be used for both internal and external use, together with ones that are able to transport both people and goods.

We are lift specialists with many years experience installing wheel chair and vertical platform lifts for the UK, and are committed to delivering top class products and services to all of our Customers. Our most popular products are the MC2000 platform lift, the M6000LS cabin platform lift and the InvaStair-Riser, our elegant, slim-line wheelchair stair lift.

All of our products are designed to comply with the relevant UK and EC Directives, and are ideal for installation in all environments, including domestic and public. We regularly install units in schools, retail outlets, churches, libraries, offices, care homes, hospitals etc.

6 Falcon Park, Claymore, Tame Valley Ind. Est. Tamworth, Staffordshire. B77 5DQ

Telephone:0845 468 2543 | Email: | Company registration number: 3950068 | Company VAT registration number: 753 8175 10