What is a Platform Lift? 
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It is an electrically powered lifting appliance.
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It can have an open or an enclosed lift-way.
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It can have a fully enclosed car or an open platform carriage within the liftway.
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It is intended for persons with impaired mobility (for people who have problems using stairs)
Hold-to-run push buttons 
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With an open carriage, a platform lift has “hold-to-run” push buttons which will allow the platform to stop immediately when released.
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The platform carriage "hold-to-run" buttons have priority over the outside landing call buttons.
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With a fully enclosed car automatic controls may be used.
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Automatic controls have priority over the outside landing call button.
Travel speed is limited to 0,15 m/s. 
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The speed of a Platform Lift must not exceed 0,15 m/s.
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The slow speed will limit the stopping distance of a moving platform, to a maximum of 10-15 mm.
Sensitive safety edges or photo cell protection for added safety
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Sensitive safety edges or photo cell protection are mounted where the platform is open to the surrounding shaft walls.
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The distance between the platform and the smooth, hard, surrounding shaft walls is maximum <10-20 mm.
Drive systems for Platform Lifts 
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Due to different climate zones and traditions in Europe there are two main drive systems for Platform Lifts.
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The hydraulic drive system is the most common in southern and central Europe whilst the screw drive system is more common in the northern parts of Europe.