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US 2012/0259519 A1Published application
Method and apparatus for selectively activated powered actuation of a hydraulic drive system
AssigneeRS Drawings, LLC
InventorKarapet Ablabutyan
Life of this patent
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Abstract
A method and apparatus for selectively activating a gravity down mode of a hydraulic system during operation of a lift gate. An electronic control circuit is added to hydraulic control circuitry and is configured to selectively interrupt the power down mode or gravity down mode of operation of the hydraulic system based on either a manual input (override) or a sensed condition and switch to the other mode of operation.
Claims11
A hydraulic lift gate system for a hydraulic lift gate attached to a vehicle, the system comprising:
- an electronic control circuit integrated into the system and being configured to enable selective activation of a gravity down mode of operation of the hydraulic lift gate attached to the vehicle at any time during a power down mode of operation.
A method for controlling a hydraulic lift gate attached to a vehicle comprising the steps of:
- sensing a condition of the lift gate during a power down mode of operation requiring a switch to gravity down mode of operation;
- and
- activating the gravity down mode of operation by switching from power down mode to gravity down mode upon a determination of the presence of the sensed condition.
Dependencies are inferred from the claim text.