Earthworking vehicle

Claim 2

An earthworking vehicle having a boom pivoted on the vehicle, first motor means mounted on the vehicle for pivoting the boom, a first operator for controlling operation of the first motor means and movable between inoperative and operative positions to cause the motor to pivot the boom, an implement pivoted on the boom, second motor means connected to the vehicle to pivot the implement and having a range of movement including an intermediate point, and a second operator for controlling operation of the second motor means, movable between an inoperative position and an operative position actuating the second motor means, and biasing means normally locating the second operator in the inoperative position, characterized by implement position control means including a power device for moving the second operator from inoperative to operative position, and a control circuit for the power device including a power source, and first and second control devices actuatable concurrently to connect the power source to the power device to effect movement of the second operator to operative position to actuate the second motor means, the first control device being actuated in response to movement of the first operator to operative position and the second control device being actuated in response to movement of the second motor means to one side of the intermediate point, the second control device being deactuated in response to movement of the second motor means to the other side of the intermediate point to enable the biasing means to locate the second operator in the inoperative position to deactuate the second motor means.

Claim 3

An earthworking vehicle according to claim 1, wherein the control circuit includes a third control device manually actuatable to enable the concurrent actuation of the first and second control devices to effect movement of the second operator to operative position and manually deactuatable to prevent movement of the second operator to operative position.

Claim 4

An earthworking vehicle according to claim 1, wherein the power device is a fluid powered device, the control circuit is a pressure fluid circuit, the power source is a power fluid source, and the first and second control means are valves in the circuit.

Claim 5

An earthworking vehicle according to claim 3, wherein the control circuit includes a manually operable third valve having an open position permitting communication between the source and the fluid powered device as controllEd by the first and second valves and a closed position preventing communication between the source and the fluid powered device.

Claim 6

An earthworking vehicle according to claim 1, wherein the implement position control means include a second power device for moving the first operator from operative to inoperative positions, a third control device in the control circuit connecting the source with the second power device, and actuatable upon pivotal movement of the boom beyond a predetermined point relative to the vehicle to connect the source with the second power device and move the first operator to inoperative position.

Claim 7

An earthworking vehicle having a boom pivoted on the vehicle for movement between raised and lowered positions; a first double-acting hydraulic motor mounted on the vehicle for pivoting the boom; a hydraulic power fluid source on the vehicle; a first control circuit including a first valve interconnecting the source and the first motor, the first valve being movable between a neutral position immobilizing the first motor, alternative raise and lower positions enabling power operation of the first motor and a detented float position enabling fluid circulation within the motor; an earthworking bucket pivotally mounted on the boom for movement between curled and dumped positions; a quadrilateral linkage interconnecting the bucket and the vehicle for automatically pivoting the bucket on the boom upon boom movement, said linkage including a second double-acting hydraulic motor extensible and retractable to curl and dump the bucket; the first circuit including a second valve interconnecting the source and the second motor, the second valve being movable between a neutral position immobilizing the second motor and alternative curl and dump positions enabling power operation of the second motor; and biasing means biasing the second valve to neutral position, characterized by bucket position control means including a fluid power device for moving the second valve to curl position; a second power fluid source; a second control circuit connecting the second source to the device including third and fourth valves in series, the third and fourth valves being concurrently openable to actuate the device; a third valve actuator responsive to movement of the first valve to lower position to open the third valve; and a fourth valve actuator responsive to retraction of the second motor beyond a predetermined point to open the fourth valve to enable actuation of the device to move the second valve to curl position, and responsive to contraction of the second motor beyond the predetermined point to close the fourth valve to deactuate the device and enable the biasing means to move the second valve to neutral position to deactuate the second motor.

Claim 8

An earthworking vehicle having a boom pivoted on the vehicle for movement between raised and lowered positions; a first double-acting hydraulic motor mounted on the vehicle for pivoting the boom; a hydraulic power fluid source on the vehicle; a first control circuit including a first valve interconnecting the source and the first motor, the first valve being movable between a neutral position immobilizing the first motor, alternative raise and lower positions enabling power operation of the first motor and a detented float position enabling fluid circulation within the motor; an earthworking bucket pivotally mounted on the boom for movement between curled and dumped positions; a quadrilateral linkage interconnecting the bucket and the vehicle for automatically pivoting the bucket on the boom upon boom movement, said linkage including a second double-acting hydraulic motor extensible and retractable to curl and dump the bucket; the first circuit including a second valve interconnecting the source and the second motor, the second valve being movable between a neutral position immobilizing the second motor and alternative curl and dump positions enabling power operation of the second motor; and biasing means biasing the second valve to neutral position, characterized by bucket position control means including a fluid power device for moving the second valve to curl position; a second power fluid source; a second control circuit connecting the second source to the device including third and fourth valves in series, the third and fourth valves being concurrently openable to actuate the device; a third valve actuator responsive to movement of the first valve to lower position to open the third valve; and a fourth valve actuator responsive to retraction of the second motor beyond a predetermined point to open the fourth valve to enable actuation of the device to move the second valve to curl position, and responsive to contraction of the second motor beyond the predetermined point to close the fourth valve to deactuate the device and enable the biasing means to move the second valve to neutral position to deactuate the second motor.

Claim 9

An earthworking vehicle according to claim 6, wherein the second circuit includes a fifth valve in series with the third and fourth valves, manually openable to enable the concurrent opening of the first and second valves to actuate the fluid power device and manually closable to deactuate the device.

Claim 10

An earthworking vehicle according to claim 7, wherein the bucket position control means include a second fluid power device for moving the first valve from raise to neutral position, a sixth valve in the second circuit connecting the second source to the second device, and a sixth valve actuator openable in response to raising movement of the boom to a predetermined height to interconnect the second source and the second device to move the first valve from raise to neutral position.

Claim 11

An earthworking vehicle having a boom pivoted on the vehicle, first motor means mounted on the vehicle for pivoting the boom, a first operator for controlling operation of the first motor means and movable between inoperative and operative positions to cause the motor to pivot the boom, an implement pivoted on the boom, second motor means connected to the vehicle to pivot the implement and having a range of movement including an intermediate point, and a second operator for controlling operation of the second motor means, movable between an inoperative position and an operative position actuating the second motor means, and biasing means normally locating the second operator in the inoperative position, characterized by implement position control means including actuating means for moving the second operator from inoperative to operative position in response to movement of the first operator to operative position when the second motor means is positioned to one side of the intermediate point and position responsive means responsive to movement of the second motor means to the other side of the intermediate point to deactuate the actuating means and effect movement of the second operator from operative to inoperative position.

Claim 12

An earthworking vehicle having a boom pivoted on the vehicle, first motor means mounted on the vehicle for pivoting the boom, a first operator for controlling operation of the first motor means and movable between inoperative and operative positions to cause the motor to pivot the boom, an implement pivoted on the boom, second motor means connected to the vehicle to pivot the implement and having a range of movement including an intermediate point, and a second operator for controlling operation of the second motor means, movable between an inoperative position and an operative position actuating the second motor means, and biasing means normally locating the second operator in the inoperative position, characterized by implement position control means including actuating means for moving the second operator from inoperative to operative position in response to movement of the first operator to operative position when the second motor means is positioned to one side of the intermediate point and position responsive means responsive to movement of the second motor means to the other side of the intermediate point to deactuate the actuating means and effect movement of the second operator from operative to inoperative position.