WILLIAM LEE MCDUFFIE
Pilots at Dogwood Dr, Oak Ridge, LA
License number
Louisiana A1244926
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
412 Dogwood Dr #201, Oak Ridge, LA 71264
Professional information
Hydraulic Lifting Device
US Patent:
5110090, May 5, 1992
Filed:
Feb 25, 1991
Appl. No.:
7/660041
Inventors:
William L. McDuffie - Oak Ridge LA
International Classification:
E21B 1900
US Classification:
254124
Abstract:
A hydraulic lifting device for sequentially lifting the respective support frames, axles and wheels of a wheeled irrigation system, in order to pivot the wheels in a transverse or longitudinal orientation with respect to the respective axles for deploying the irrigation system in a field. The hydraulic lifting device includes an upward-standing support frame adapted for attachment to the three-point support system of a tractor, a carriage attached to the support frame in vertically sliding relationship, a hydraulic cylinder mounted on the support frame and carriage for raising and lowering the carriage with respect to the support frame, upper and lower lifting member sleeves secured to the carriage and a detachable lifting member carried by the lifting member sleeves for engaging the respective axles and raising and lowering the axles and wheels.