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. 29, 1994
Filed:
Feb. 22, 1993
Paul W Niemela, Pickens, SC (US);
Ryobi Motor Products, Easley, SC (US);
Abstract
System and method for selecting a rotational direction of a permanent magnet DC motor, the system including multiple relays and a control switch electrically interconnected so as to provide an open circuit to the motor when the motor is off. In one embodiment, the system includes first and second relays each including switch contacts and a coil for switching voltage to the motor. The system also includes a third relay including switch contacts and a coil for switching voltage to the motor, a control switch having multiple switch positions for selecting the rotational direction of the motor. The control switch, the motor and the relays are electrically interconnected such that a first control switch position provides a first voltage to the motor, a second control switch position provides a second voltage to the motor, the second voltage being opposite in polarity to the first voltage, and a third control switch position provides the open circuit to the motor.