Land vehicles – Wheeled – Articulated vehicle
Patent
1987-12-02
1989-03-28
Mitchell, David M.
Land vehicles
Wheeled
Articulated vehicle
403330, B60D 114
Patent
active
048157520
ABSTRACT:
The lift unit comprises a bracket portion that is secured to the trailer tongue and a hinge portion that pivots on the bracket portion about a horizontal axis to raise and lower a chain for flexing and relaxing a spring bar that when flexed, serves to transfer a portion of the tongue weight to the towing vehicle. A flat rectangular member is eccentrically mounted on the side of the hinge portion to hang in the 6:00 o'clock position unless acted upon by influences other than gravity. When the hinge portion is operated to raise the chain and thereby flex the spring bar, a longer side of the rectangular member abuts and rides along the edge of a side of the bracket portion resulting in the member being swung clockwise to about the 8:00 o'clock position when full chain elevating position is reached. At this time one corner of the member drops into a notch in the bracket portion and prevents the hinge portion from being operated in the direction of chain lowering. The member is kept in this position by passing a tethered pin through the member and the hinge. When the pin is removed, the member can be swung further clockwise to about 4:00 o'clock to enable the chain to be lowered. The edge of the bracket's side acts on the member during chain lowering to swing the member counterclockwise back to 6:00 o'clock thereby automatically resetting the member for automatic locking when the chain is again raised.
REFERENCES:
patent: D213616 (1969-03-01), Bock
patent: 2546206 (1951-03-01), Arehart
patent: 3185499 (1965-05-01), Reese
patent: 3497240 (1970-02-01), Harms
patent: 3679232 (1972-07-01), Weber
patent: 3756618 (1973-09-01), Lewis
patent: 3778088 (1973-12-01), Alexander
patent: 4211427 (1980-07-01), Young
Mellow James L.
Young David A.
Diederiks, Jr. Everett G.
Mitchell David M.
The Fisher Group, Inc. (Draw-Tite Division)
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