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. 23, 1987
Filed:
Feb. 04, 1986
Applicant:
Inventor:
John A Kenfield, Calgary, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F03D / ;
U.S. Cl.
CPC ...
416 14 ; 416 16 ;
Abstract
A double-acting hydraulic cylinder is pivotally mounted between the head and tail assemblies of a wind turbine, to act as a damper. The cylinder is connected with a hydraulic fluid reservoir container. Means, such as restrictive orifices, are provided to control the rates of flow in the fluid lines between the cylinder and the reservoir, so that the rate of pivoting of the head assembly when furling is relatively fast and relatively slow when unfurling.