US3589450A — Attachment hitch for tractors

Claim 1

Independent Claim 189 words

In a tractor having an attachment hitch at its underside and an attachment drawn by the hitch at its underside and an attachment drawn by the hitch, the improvement in which the hitch comprises a hanger bracket having a downwardly open way disposed on a transverse axis and a pin socket disposed on a longitudinal axis, said attachment having a hitch coupling with a transverse drawbar receivable upwardly into said way and a coupling piece having a pin socket aligned with the pin socket on the hanger bracket, and a pin receivable through said sockets to connect the hitch coupling to the hanger bracket, said hanger bracket comprising end plates with upwardly extending, downwardly open slots which define said way, and front and rear plates which span laterally from one end plate to the other respectively at the front and rear of said slots, said front and rear plates having longitudinally aligned holes which constitute said pin socket on the hanger bracket, said coupling piece comprising a tab extending downwardly from the drawbar, said front and rear plates having downwardly extending ears within which said pin sockets are formed.

Claim 2

Dependent Claim 189 words

In a tractor having an attachment hitch at its underside and an attachment drawn by the hitch at its underside and an attachment drawn by the hitch, the improvement in which the hitch comprises a hanger bracket having a downwardly open way disposed on a transverse axis and a pin socket disposed on a longitudinal axis, said attachment having a hitch coupling with a transverse drawbar receivable upwardly into said way and a coupling piece having a pin socket aligned with the pin socket on the hanger bracket, and a pin receivable through said sockets to connect the hitch coupling to the hanger bracket, said hanger bracket comprising end plates with upwardly extending, downwardly open slots which define said way, and front and rear plates which span laterally from one end plate to the other respectively at the front and rear of said slots, said front and rear plates having longitudinally aligned holes which constitute said pin socket on the hanger bracket, said coupling piece comprising a tab extending downwardly from the drawbar, said front and rear plates having downwardly extending ears within which said pin sockets are formed.

Claim 3

Dependent Claim 167 words

In a tractor having an attachment hitch at its underside and an attachment drawn by the hitch, the improvement in which the hitch comprises a hanger bracket attached to the tractor and having an elongated downwardly open way disposed on a transverse axis and a pin socket disposed centrally of said way and on a longitudinal axis, said attachment having a hitch coupling with a transverse drawbar receivable upwardly into said way and into direct drawing thrust-transmitting relation to the hanger bracket and a coupling piece having a pin socket aligned with the pin socket on the hanger bracket, and a pin receivable through said sockets to connect this hitch coupling to the hanger bracket and support the drawbar in direct drawing thrust-transmitting relation to the hanger bracket without imposing such thrust on the pin, said drawbar being provided with means for locking it against pivotal movement in sAid way about the longitudinal axis of said pin whereby the hitch coupling follows transverse movements of the tractor.

Claim 4

Dependent Claim 167 words

In a tractor having an attachment hitch at its underside and an attachment drawn by the hitch, the improvement in which the hitch comprises a hanger bracket attached to the tractor and having an elongated downwardly open way disposed on a transverse axis and a pin socket disposed centrally of said way and on a longitudinal axis, said attachment having a hitch coupling with a transverse drawbar receivable upwardly into said way and into direct drawing thrust-transmitting relation to the hanger bracket and a coupling piece having a pin socket aligned with the pin socket on the hanger bracket, and a pin receivable through said sockets to connect this hitch coupling to the hanger bracket and support the drawbar in direct drawing thrust-transmitting relation to the hanger bracket without imposing such thrust on the pin, said drawbar being provided with means for locking it against pivotal movement in sAid way about the longitudinal axis of said pin whereby the hitch coupling follows transverse movements of the tractor.

Claim 5

Dependent Claim 41 words

The invention of claim 3 in which said means for locking comprises brace arms at the ends of said drawbar, said brace arms engaging fixed parts of the tractor when the pin is engaged in its socket to lock said drawbar.

Claim 6

Dependent Claim 38 words

The invention of claim 2 in which the attachment comprises a grader, said grader following the transverse movements of the tractor, and depth control means connecting the grader to the tractor at a point rearwardly of said hitch.

Claim 7

Dependent Claim 170 words

A single point hitch for connecting an attachment to a tractor, said hitch comprising a hanger bracket attached to and depending from the undersurface of the tractor, said bracket having a downwardly open, laterally elongated channel and a pin socket centrally of the channel and aligned in the direction of tractor movement, said attachment having a coupling including a drawbar receivable into said channel and into direct drawing thrust-transmitting relation to the hanger bracket to transmit tractor-drawing pressure to the attachment and a coupling piece having a pin socket aligned with the pin socket on the hanger bracket, and a pin receivable through said sockets to releasably connect the hitch coupling to the hanger bracket and support the drawbar in direct drawing thrust-transmitting relation to the hanger bracket without imposing such thrust on the pin, said drawbar having stabilizing arms braced against fixed parts of the tractor when the pin couples the attachment to the hanger bracket, whereby the drawbar is held against rocking movement laterally about the pin axis.

Claim 8

Dependent Claim 170 words

A single point hitch for connecting an attachment to a tractor, said hitch comprising a hanger bracket attached to and depending from the undersurface of the tractor, said bracket having a downwardly open, laterally elongated channel and a pin socket centrally of the channel and aligned in the direction of tractor movement, said attachment having a coupling including a drawbar receivable into said channel and into direct drawing thrust-transmitting relation to the hanger bracket to transmit tractor-drawing pressure to the attachment and a coupling piece having a pin socket aligned with the pin socket on the hanger bracket, and a pin receivable through said sockets to releasably connect the hitch coupling to the hanger bracket and support the drawbar in direct drawing thrust-transmitting relation to the hanger bracket without imposing such thrust on the pin, said drawbar having stabilizing arms braced against fixed parts of the tractor when the pin couples the attachment to the hanger bracket, whereby the drawbar is held against rocking movement laterally about the pin axis.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-06-28	1974-12-28	1975-06-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-06-28	1978-12-28	1979-06-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-06-28	1982-12-28	1983-06-29	$7700.00	Window Closed / Lapsed

Attachment hitch for tractors

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