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:
Oct. 09, 2001
Filed:
Jan. 24, 2000
Raymond C. Franke, Glenshaw, PA (US);
Robert P. Bozio, Pittsburgh, PA (US);
Leonard M. Wydotis, Mars, PA (US);
Union Switch & Signal, Inc., Pittsburgh, PA (US);
Abstract
A motor control apparatus for a railway switch machine includes a power source for a voltage; a selector for providing the voltage to a reversible motor of the switch machine in a normal state, and for providing a reverse polarity of the voltage to the reversible motor in a reverse state; a first transistor for switching reverse current flowing through the reversible motor; a first diode electrically connected in parallel with the first transistor for conducting normal current for the reversible motor; a second transistor for switching normal current flowing through the reversible motor; a second diode electrically connected in parallel with the second transistor for conducting reverse current for the reversible motor; and a circuit for controlling the first and second transistors based upon the position or operating mode of the railway switch machine.