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:
May. 18, 1999
Filed:
Dec. 15, 1997
Jeffrey C Hoppe, Unionville, MI (US);
Walbro Corporation, Cass City, MI (US);
Abstract
A permanent magnet armature solenoid has a tip formed of a non-magnetic material operably connected to a ferromagnetic insert which is firmly held to the end of the magnetic armature by the magnetic attraction between the insert and armature. The magnetic field of the armature holds the armature and the insert together as a single unit, even under high acceleration, deceleration and rapid movement of the armature. The insert is relatively small compared to the armature and the addition of the insert to the solenoid does not significantly adversely affect the performance of the solenoid. The insert is preferably formed of a magnetically susceptible metal such as iron, steel or stainless steel. Desirably, the tip is formed of a polymeric material and preferably of an elastomer so that the tip may be molded directly to the insert by conventional molding techniques to facilitate molding the non-magnetic tip onto the insert.