Patent · US Active

Accurate position tracking for motorized lifting device

US9988248B2 · kind B2 · utility

3Cited by

85References

10Claims

0Family size

Inventors

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

Key dates

Filing date	Apr 4, 2014
Grant date	Jun 5, 2018
Priority date	—
Expiry date	Oct 2, 2034

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB66D5/32
WIPO fieldHandling
WIPO sectorMechanical 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. An encoder is provided to measure an angular position of the drum. A counter is provided to record a number of rotations of the drum. A locking mechanism automatically prevents rotation of the drum when the drum stops. Using this information, a processor may calculate an amount of line let out from the drum based on the number of rotations of the drum, the angular position of the drum, and a radius of the drum. In certain embodiments, the angular position and/or number of rotations is stored in non-volatile memory so that is can be recovered in the event of a power outage or other significant event.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.