Lift assembly systems and methods

US10968085B2 · kind B2 · utility

Assignee

• Electronic Theatre Controls, Inc. · US

Inventors

• Donald A. Hoffend, III · Winston-Salem, US
• William R. Florae · Verona, US
• Michael Lichter · Holzkirchen, DE
• Edwin W. Bolz · Queensbury, US

Key dates

• Filing date: Feb 27, 2019
• Grant date: Apr 6, 2021
• Expiry date: Jun 30, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L5/107
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A lift assembly includes an article to be lifted between a lowered position and a raised position, a drive element coupled to the article, a power mechanism coupled to the drive element, and a power transfer mechanism coupled between the power mechanism and the drive element. The power transfer mechanism includes control electronics having a first upward limit switch adapted to deactivate the power mechanism when the article is lifted to a first upward height, and a second upward limit switch adapted to deactivate the power mechanism when the article is lifted to a second upward height higher than the first upward height.