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. 07, 1987
Filed:
Dec. 04, 1984
Edwin J Luetzow, Framington, MN (US);
Minnesota Technical Research, Farmington, MN (US);
Abstract
Solenoid for use in harsh difficult environmental conditions for actuation in a pulling motion along a straight line where the magnetic core travels within a stainless steel non-magnetic sleeve. The core uses a plurality of broad Teflon rings fitted in broad annular grooves to reduce friction and wear along its path of travel, to reduce cross-section tangential point to point contact wear, and to prevent sacrificial corrosion of the moveable magnetic core or sleeve due to galvanic action when moisture is present. The core is zinc coated and the sleeve is stainless steel for the prevention of corrosion and rust in order to ensure a smooth and contaminant free inner surface for proper and unhampered movement of the core. Annular Teflon bearings are utilized, as moisture will not cause the Teflon bearing to freeze in low temperature applications.