The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2014
Filed:
Feb. 19, 2010
William R. Kennedy, Taylorville, IL (US);
John M. Kennedy, Taylorville, IL (US);
William R. Kennedy, Taylorville, IL (US);
John M. Kennedy, Taylorville, IL (US);
Kennedy Metal Products & Buildings, Inc., Taylorville, IL (US);
Abstract
A mine door system comprising at least one mine door leaf hinged at one side thereof to a door frame defining an entry. The system includes an articulated door-moving mechanism that articulates between a first configuration in which the mechanism applies a relatively small door-moving force to the door leaf to move the door leaf at a first speed and a second configuration in which the mechanism applies a larger door-moving force to the door leaf to move the door leaf at a second speed less than the first speed. A related method is also disclosed.