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US 6,199,638 B1Granted
Tractor implement height holding device
OwnerW. Wallace Bentleyinventor
Life of this patent
Estimating the term…
Abstract
A device for mechanically establishing the lowest point a three-point tractor hitch can sink to. The device comprises a modified chain which is attached at both ends to the towed implement near where the lift arms are attached to the implement. The chain's middle portion is draped over and adjustably attached to the top link, with the result that as the lift arms are lowered the chain draws taut and prevents the lift arms from sinking any lower.
Claims4
A device for mechanically fixing the minimum height off the ground of an agricultural implement attached to a pair of lift arms and a top link of a tractor, comprising:
- a height maintaining link, being substantially inelastic when placed under tension, having a first end and a second end, with said first end being attached to said implement in close proximity to said lift arms, and with said second end being attached to said top link, so that as said lift arms are lowered said height maintaining link comes under tension and prevents said lift arms from descending further.
Dependencies are inferred from the claim text.