Static pressure anti-stow logic for platform wheelchair lifts
AssigneeRicon Corporation
InventorsDante V. Deleo, Steven Fisher
Life of this patent
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Abstract
A method for detecting weight on a platform lift having a platform, a hydraulic cylinder, and a hydraulic circuit including the steps of measuring a static pressure of the hydraulic circuit, and comparing the measured static pressure to a baseline pressure of the hydraulic circuit. The baseline pressure is a static pressure of the hydraulic circuit without external weight positioned on the platform.
Claims20
A method for detecting weight on a platform lift having a platform, a hydraulic cylinder, and a hydraulic circuit, comprising the steps of:
- measuring a static pressure of the hydraulic circuit;
- and
- comparing the measured static pressure to a baseline pressure of the hydraulic circuit,
- wherein the baseline pressure is a static pressure of the hydraulic circuit without external weight positioned on the platform.
A method of detecting weight on a platform wheelchair lift for a vehicle comprising the steps of:
- providing a platform wheelchair lift comprising a platform having a planar surface, a parallelogram mechanism, platform linkage connecting the platform to the parallelogram mechanism, a hydraulic cylinder connected to the parallelogram mechanism, and a hydraulic circuit, wherein the platform wheelchair lift has an entry position where the platform is level with a floor of the vehicle, and a stowed position where the platform is positioned within the vehicle;
- measuring a static pressure of the hydraulic circuit when the platform wheelchair lift is in the entry position;
- and
- comparing the measured static pressure to a baseline pressure of the hydraulic circuit,
- wherein the baseline pressure is a static pressure of the hydraulic circuit without external weight positioned on the platform.
A method for detecting weight on a platform lift having a platform, a hydraulic cylinder, and a hydraulic circuit, comprising the steps of:
- connecting a pressure switch to a feed line for the hydraulic cylinder, the pressure switch having a first position and a second position;
- and
- setting a triggering pressure for the pressure switch to a value that is at least equal to a static pressure of the hydraulic circuit without external weight positioned on the platform,
- wherein the pressure switch is in the second position when a pressure of the hydraulic circuit is higher than the triggering pressure.
Dependencies are inferred from the claim text.