Intelligent motorized lifting device

US9908754B2 · kind B2 · utility

Inventors

• David R. Hall · Provo, US
• Jerome Miles · Spanish Fork, US
• Davido Hyer · Spanish Fork, US
• Chris Jones · Spanish Fork, US
• Kevin Rees · Herriman, US

Key dates

• Filing date: Apr 4, 2014
• Grant date: Mar 6, 2018
• Expiry date: Sep 16, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66D1/58
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

An apparatus includes a drum to draw in or let out a line and a motor and transmission coupled to the drum to apply a torque thereto. A tracking module tracks an actual amount of line let out from the drum. A servo control unit receives the actual amount, compares the actual amount to a desired amount of line to let out from the drum, and generates an error signal reflecting a difference between the actual amount and the desired amount. A modulation module generates, from the error signal, a control signal to control the motor, thereby bringing the actual amount into better alignment with the desired amount.