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:
Apr. 16, 1985
Filed:
Dec. 27, 1983
David I Ellingson, Newton, IA (US);
James D Wilson, Newton, IA (US);
The Maytag Company, Newton, IA (US);
Abstract
A control system is provided for operating a washing machine through a cycle of operations and for ensuring that an access door is closed and locked during predetermined portions of the cycle and for ensuring that sensor switches are properly operable. A microcontroller-based programmer controls the washing machine through the cycle of operations. A first switch is actuatable by the access door for enabling energization of the washing machine upon movement of the access door to the closed position and a latch mechanism is energizable by the programmer for positioning the latch mechanism to effect the locking of the access door in the closed position if the first switch is closed. A second switch is in circuit with the programmer and is operable from a first to a second posture upon locking of the access door to provide a door-latched signal to the programmer. The programmer is further operable for effecting a signal to the second switch and for receiving a verification signal with the second switch in the first posture to confirm the proper operability of the second switch upon receiving the door-latched signal. The programmer is operable for verifying the second posture of the second switch throughout at least preselected portions of the cycle of operations and is operable for terminating operation of the washing machine upon detecting an inoperable second switch or an unlatched access door.