Door Assist System

We have developed and fielded two different DAS approaches. The Light DAS is designed for light applications, consists of an electric gear motor, spur gear, and a single arc gear rack that is engaged using a gear follower. The unit is typically externally mounted to the door, and actuates between the roof line clevis and gear follower. It can be used on level ground or up to 17° slope (30% grade), operates up to 50 cycles on a full battery charge, opens or closes the door in less than 5 seconds and can operate in either a powered automatic mode or manually. Each door operates and is powered independently via a 24 volt power pack, which is charged by the vehicle’s charging system when running. The safety tape switches automatically stop the door if something (or someone) prevents the door from closing. It can be disengaged in an emergency by pulling the roof clevis pin from the gear rack.

The second system, for heavy applications, consists of a self-contained module within each door. Each module contains a hydraulic pump, reservoir, controller, and battery, allowing full operation independent of any other vehicle system.  The modular approach simplifies installation and maintenance while increasing flexibility for both internal and external mounting locations. The Heavy DAS can be used to power very heavy doors up to 3,000 lbs or 1,360 kg.  The performance parameters are similar to the light applications DAS.  This system is in service on Caiman MRAPs that incorporate the heavy door protection needed to defeat EFP threats.