Clifton E. Groombridge
Engineers in Hardin, MT

License number
South Dakota 7291
Expiration Date
Mar 31, 2019
Category
Professional Engineer
Type
Electrical
Address
Address
PO Box 66, Hardin, MT 05934
Phone
(406) 665-2606
LicenseFiles verified this license of Feb 17, 2017 at the South Dakota Department of Licensing and Regulation.

Professional information

Clifton Groombridge Photo 1

Apparatus And Method For Controlling The Rotary Airlocks In A Coal Processing System By Reversing The Motor Current Rotating The Air Lock

US Patent:
5575085, Nov 19, 1996
Filed:
Jul 17, 1995
Appl. No.:
8/504055
Inventors:
Clifton E. Groombridge - Hardin MT
Assignee:
Western Syncoal Company - Billings MT
International Classification:
F26B 308
US Classification:
34368
Abstract:
An improvement to a coal processing system where hard materials found in the coal may cause jamming of either inflow or outflow rotary airlocks, each driven by a reversible motor. The instantaneous current used by the motor is continually monitored and compared to a predetermined value. If an overcurrent condition occurs, indicating a jamming of the airlock, a controller means starts a "soft" reverse rotation of the motor thereby clearing the jamming. Three patterns of the motor reversal are provided.