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:
Nov. 10, 1998
Filed:
Sep. 08, 1997
James E Moe, Circle Pines, MN (US);
Donald L LeVoir, Coon Rapids, MN (US);
Safetran Systems Corporation, Minneapolis, MN (US);
Abstract
A railroad crossing gate electrical control system for moving a crossing gate in up and down directions and providing snubbing protection to gate movement in failure modes includes an electrical motor having two diametrically positioned permanent magnet poles and two series connected electromagnet poles. There is an armature which rotates inside of the poles. There is a motor and snub relay which has contacts connected to the armature and the series connected electromagnet poles. A terminal board has movable contacts which are connected to the motor and snub relay and to a relay coil for moving the contacts of the motor and snub relay. A source of power is connected to the terminal board, with the movable terminal board contacts controlling the application of power to the motor snub relay coil and the relay contacts for causing up and down movement and for providing snubbing of armature movement during up and down gate movement and gate failure modes. An overspeed control is connected across the armature for limiting armature speed.