US4122960A — Pedal linkage for the boom arms and attachment ca…

Claim 1

Independent Claim 350 words

In a skid-steered tractor vehicle, a body, an engine mounted toward the rear, an operator's compartment forward of the engine having a space near the front of the body for the operator's legs, a pair of uprights, one on each side of the body, boom arms pivotally connected to the uprights extending forwardly and downwardly at the front of the body in the lowered position, an attachment carrier pivotally mounted on the ends of the boom arms, fluid motor means connected between the uprights and boom arms for raising and lowering the boom arms, other fluid motor means connected between the boom arms and attachment carrier for pivoting the attachment carrier, a control valve for operating the boom arms and attachment carrier having a first valve spool movable from a neutral position in one direction for extending the one fluid motor means causing the boom arms to be raised and movable in the opposite direction from the neutral position for retracting the one fluid motor means causing the boom lift arms to be lowered, a second valve spool operable in the same manner as the first for causing the other fluid motor means to either extend or retract for pivoting the attachment carrier, the improvement comprising rockable foot pedals in the operator's compartment, a first link member connected to one of the pedals, a second link member connected to one of the valve spools, said first and second link members having their opposite ends spaced laterally, a bridging link connecting the opposite ends of the first and second link members having a connection intermediate its ends on the vehicle, said connection including a pin received in a slot, each longer than it is wide in the lateral direction, one having flat sides while the other has curved sides in rockable, antifriction contact therewith, said bridging link rocking on said antifriction contact for transmitting the linear motion of the first link to said second link corresponding to the movement of said pedal, and other link means connecting the other pedal and valve spool to extend or retract the other fluid motor.

Claim 2

Dependent Claim 350 words

In a skid-steered tractor vehicle, a body, an engine mounted toward the rear, an operator's compartment forward of the engine having a space near the front of the body for the operator's legs, a pair of uprights, one on each side of the body, boom arms pivotally connected to the uprights extending forwardly and downwardly at the front of the body in the lowered position, an attachment carrier pivotally mounted on the ends of the boom arms, fluid motor means connected between the uprights and boom arms for raising and lowering the boom arms, other fluid motor means connected between the boom arms and attachment carrier for pivoting the attachment carrier, a control valve for operating the boom arms and attachment carrier having a first valve spool movable from a neutral position in one direction for extending the one fluid motor means causing the boom arms to be raised and movable in the opposite direction from the neutral position for retracting the one fluid motor means causing the boom lift arms to be lowered, a second valve spool operable in the same manner as the first for causing the other fluid motor means to either extend or retract for pivoting the attachment carrier, the improvement comprising rockable foot pedals in the operator's compartment, a first link member connected to one of the pedals, a second link member connected to one of the valve spools, said first and second link members having their opposite ends spaced laterally, a bridging link connecting the opposite ends of the first and second link members having a connection intermediate its ends on the vehicle, said connection including a pin received in a slot, each longer than it is wide in the lateral direction, one having flat sides while the other has curved sides in rockable, antifriction contact therewith, said bridging link rocking on said antifriction contact for transmitting the linear motion of the first link to said second link corresponding to the movement of said pedal, and other link means connecting the other pedal and valve spool to extend or retract the other fluid motor.

Claim 3

Dependent Claim 35 words

The improvement according to claim 1 where the first and bridging links are fixed loosly at their adjoining ends to permit relative angular displacement as required by the rocking antifriction contact of the bridging link.

Claim 4

Dependent Claim 121 words

The improvement according to claim 2 where a plurality of pivotal connections are formed between the links, pedals and valve spools, each comprising a hole in the adjacent memembers of a diameter greater than the thickness of the material of said members along the axis of the holes, a connection of thinner material having a pair of smaller holes located over the larger holes in the adjacent members, a pin in the smaller holes loosely received through the larger holes permitting pivotal movement of the adjacent members and a bracket for supporting each pedal having a slotted connection on the vehicle body to permit shifting of the pedals relative to the linkage and valve spools to provide adjustment in the linkage.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1981-10-30	1982-05-01	1982-10-31	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1985-10-30	1986-05-01	1986-10-31	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1989-10-30	1990-05-01	1990-10-31	$7700.00	Window Closed / Lapsed

Pedal linkage for the boom arms and attachment carrier of a skid-steered tractor vehicle

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