B - Operations – Transporting – 62 – D
Patent
B - Operations, Transporting
62
D
280/134, 280/143
B62D 1/14 (2006.01) A01D 67/00 (2006.01)
Patent
CA 1105517
HYDRAULIC LOCK FOR THE SWINGABLE TONGUE OF A TOWED MACHINE Abstract of the Disclosure A pull-type mobile harvesting machine includes a header supported on a main frame and an arch-like tongue swingably connected to the main frame and extending forward over the header for pivoting connection to a tractor. A double-acting hydraulic steering cylinder controlled from the tractor is connected between the frame and tongue for swinging the tongue relative to the frame while the machine is advancing so that the machine is displaced laterally selectively between a range of operating positions, offset relative to the tractor, and transport posi- tions, generally immediately behind the tractor. A shut-off valve in one of the hydraulic lines to the cylinder makes it possible to trap oil in one side of the cylinder in any given condition of cylinder extension, thus locking the tongue in a given position relative to the frame and also preventing flow of oil to the cylinder so that inadvertent manipulation of a cylinder control valve at the tractor does not cause accidental swinging of the tongue and lateral displacement of the machine relative to the tractor.
330050
Davis Wilbur M.
Oakes Jay E.
Borden Ladner Gervais Llp
Deere & Company
LandOfFree
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