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:
Jul. 29, 1997
Filed:
Nov. 22, 1995
Nadir Sharaf, Mounds Veiw, MN (US);
Michael T Hegland, Mounds Veiw, MN (US);
Onan Corporation, Minneapolis, MN (US);
Abstract
An electric transfer switch includes a linear actuator operable to switch a plurality of movable contacts from a normal power supply to a standby emergency power supply, when the normal power supply has a power outage, so as to continuously serve electricity to electric loads. A plurality of leaf springs and an offset linkage angle help prevent any incidental disconnection between the moveable contacts and the stationary contacts. The transfer switch also includes a magnetic strip. The magnetic strip is magnetized when there is a 'fault' current passing by the contact tips of the moveable and stationary contacts. The attractive force between the magnetic strip and the moveable contacts due to the magnetization overcomes the repulsive force caused by the 'fault' current so as to make the contact between the moveable contacts and the stationary contacts unopenable. The transfer switch further includes a plurality of limit switches each of which is open or closed by a protrusion disposed on a crossbar carrying the moveable contacts.