Custom lead screws for transportation applications
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Kerk Motion Products product story
Edited by the Engineeringtalk editorial team
May 17, 2002
Kerk Motion Products is offering its custom lead screw and nut for automatic door actuation.
Kerk Motion Products is offering its custom lead screw and nut for automatic door actuation.
The product, available in both standard and custom configurations, has been adapted for use in a variety of transportation-related applications, including use in mass transit vehicles such as subways, trains, and trolleys.
The lead screw assembly requires no maintenance and offers a high degree of accuracy and dependability.
Economically priced, the assembly is designed for extremely long life: it has been customer tested to more than 1 million cycles.
The screw and nut combination includes a precision-rolled, stainless steel lead screw and a custom-formulated, high-strength, self-lubricating Kerkite polymer nut.
The screw, available in lengths up to 12 feet, is offered in both right- and left-hand thread in a variety of leads (including back driving leads), up to three inches per revolution.
In a typical transportation application, the doors are opened and closed by the motor-driven screws.
In some instances (such as a set of subway doors where the two door halves meet in the middle) each door leaf has its own motor and Kerk screw to open and close.
The doors use software and motor synchronisation to achieve simultaneous movement.
In other cases, a single Kerk lead screw can be used where both doors ride on their respective half of the screw.
The lead screw is RH on one side and LH on the other, so that turning a single motor in one direction allows the two doors to move in opposite directions.
The screw is currently in use in transportation-related applications in North America, Europe, Asia and Far East.
(This was Engineeringtalk's Top Story on 16 May 2002).
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