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:
Jun. 04, 1991
Filed:
Dec. 07, 1989
David E Ziegler, Troy, OH (US);
Arthur J Bowser, Fletcher, OH (US);
Hartzell Propeller Inc., Piqua, OH (US);
Abstract
A multiple blade aircraft propeller hub has a bulkhead supporting concentric slip rings connected by slide blocks to the aircraft electrical system. Electrical conducting flexible leads connect the slip rings to electrical heating elements or de-icing boots carried by the propeller blades. Each of the leads includes an elongated flexible braided copper tube for conducting electricity and which loosely surrounds a flexible multiple strand stainless steel cable, and an extruded flexible vinyl insulating tube loosely surrounds the braided tube. The leads provide for minimizing stresses and metal fatigue in the electrical conducting braided tube with changes in blade pitch and thereby provide for a substantially extended service life.