05113956 is referenced by 50 patents and cites 16 patents.

A forwardly folding tool bar comprising a center tool bar section having wing sections pivotally secured to the outer ends thereof. Hydraulic cyclinders are operatively connected to the wing sections to cause the wing sections to be forwardly folded relative to the center tool bar section. The wing sections are supported on a transversely extending beam secured to the tongue when the folding tool bar is in its transport position. The tool bar inlcudes a telescoping tongue which may be locked in its withdrawn position without leaving the tractor. The tool bar sections are supported by gauge wheels which are mounted at the forward side of the tool bar sections so that they do not interfere with the mount of implements on the tool bar sections.

Title
Forwardly folding tool bar
Application Number
7/644944
Publication Number
5113956
Application Date
January 23, 1991
Publication Date
May 19, 1992
Inventor
Arlyn E Friesen
Box 548, Loup City, 68853
NE, US
Milford E Friesen
Box 174, Litchfield, 68852
NE, US
Agent
Zarley McKee Thomte Voorhees & Sease
IPC
A01B 63/102
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