Control means for a pair of fluid motors

Claim 2

In a material handling device including a pivotally mounted arm, a tool pivotally mounted on the arm, first and second fluid motor means for independently pivotally moving the arm and the tool, respectively, pump means for directing fluid to the first and second motor means, first valve means movable from a closed to an open position for directing fluid from said pump means to one of said first and second motor means, second valve means movable from a closed to an open position for directing fluid from said pump means to the other of said first and second motor means and manual actuator means for each of said first and second valve means; the improvement comprising: control means, including a separate source of fluid pressure and pressure operated means communicating with said separate source for moving said first and second valve means between open and closed positions, operatively connected between said first and second valve means for moving said first valve means to a partially closed position in response to opening of said second valve means whereby said arm and said tool are pivoted simultaneously at a reduced speed.

Claim 3

In a material handling device including a pivotally mounted arm, a tool pivotally mounted on the arm, separate fluid motors for pivotally moving the arm and the tool, pump means providing a pressure fluid source for operation of said motors, a first control valve actuatable from a closed to an open position to direct pressure fluid from said source to one of said motors, a second control valve actuatable from a closed to a fully open position to direct pressure fluid from said source to the other motor and in which said first control valve in its fully open position precludes flow of pressure fluid from the source to said second control valve, the improvement which comprises: A. manually operated actuator means for each of said first and second control valves for effecting such actuation thereof; B. and control means connected with said first and second control valves and with the actuator means for said first control valve and operable whenever said first control valve is in its fully open position, and in consequence of valve opening operation of the actuator means for said second control valve, to effect movement of said first control valve to a partially closed position without necessitating manual adjustment of the actuator means for said first control valve, to thereby effect diversion of pressure fluid from the source to the motor governed by said second control valve for concurrent and independent pivotal motion of the arm and tool, said control means comprising a separate source of control pressure, and said manually operated actuator means including pressure responsive means for each of said first and second control valves communicating with said source of control pressure for moving said valves from said closed to open positions in response to pressure from said separate source.

Claim 4

In a material handling device including a pivotally mounted arm, a tool pivotally mounted on the arm, separate fluid motors for pivotally moving the arm and the tool, pump means providing a pressure fluid source for operation of said motors, a first control valve actuatable from a closed to an open position to direct pressure fluid from said source to one of said motors, a second control valve actuatable from a closed to a fully open position to direct pressure fluid from said source to the other motor and in which said first control valve in its fully open position precludes flow of pressure fluid from the source to said second control valve, the improvement which comprises: A. manually operated actuator means for each of said first and second control valves for effecting such actuation thereof; B. and control means connected with said first and second control valves and with the actuator means for said first control valve and operable whenever said first control valve is in its fully open position, and in consequence of valve opening operation of the actuator means for said second control valve, to effect movement of said first control valve to a partially closed position without necessitating manual adjustment of the actuator means for said first control valve, to thereby effect diversion of pressure fluid from the source to the motor governed by said second control valve for concurrent and independent pivotal motion of the arm and tool, said control means comprising a separate source of control pressure, and said manually operated actuator means including pressure responsive means for each of said first and second control valves communicating with said source of control pressure for moving said valves from said closed to open positions in response to pressure from said separate source.

Claim 5

A material handling device comprising, a support, an arm pivoted to said support, a tool pivoted to said arm, a first fluid motor operable to pivot said arm relative to said support, a second fluid motor operable to pivot said tool rElative to said arm, pump means providing a pressure fluid source for operation of said motors, a first valve means movable between closed and open positions to control fluid flow from said source to said first motor, a second control valve means movable between closed and open positions to control fluid flow from said source to said second motor, a separate source of fluid pressure, pressure operated means communicating with said separate source for moving said control valve means between open and closed positions, control means operatively connected to said pressure operated means for moving said first valve means from said open towards said closed positions in response to movement of said second valve means from said closed to said open position for simultaneous and independent operation of said first and second motors.

Claim 6

A material handling device comprising, a support, an arm pivoted to said support, a tool pivoted to said arm, a first fluid motor operable to pivot said arm relative to said support, a second fluid motor operable to pivot said tool rElative to said arm, pump means providing a pressure fluid source for operation of said motors, a first valve means movable between closed and open positions to control fluid flow from said source to said first motor, a second control valve means movable between closed and open positions to control fluid flow from said source to said second motor, a separate source of fluid pressure, pressure operated means communicating with said separate source for moving said control valve means between open and closed positions, control means operatively connected to said pressure operated means for moving said first valve means from said open towards said closed positions in response to movement of said second valve means from said closed to said open position for simultaneous and independent operation of said first and second motors.

Claim 7

A material handling device comprising, a support, an arm pivoted to said support, a tool pivoted to said arm, a first fluid motor operable to pivot said arm relative to said support, a second fluid motor operable to pivot said tool relative to said arm, pump means providing a pressure fluid source for operation of said motors, first and second valve means, said first valve means being movable between first and second positions to control fluid flow from said source to said first motor and to said second valve means, said second valve means being movable between first and second positions to control fluid flow from said source to said second fluid motor, said second valve means being substantially isolated from said pressure fluid source when said first valve means is in said second position, a separate source of fluid, a first pressure operated means operatively connected to said first valve means and a second pressure operated means operatively connected to said second valve means for moving each of said valve means between said first and second positions, first and second manually movable control valves disposed between said separate source and said first and second pressure operated means, respectively, and being operative to control delivery of pressure to said pressure operated means, and control means operatively connected between said first and second pressure operated means for moving said first valve means from said second towards said first position in response to pressure in said second pressure operated means for simultaneous delivery of fluid from said source to said first and second valve means for independent and simultaneous operation of said first and second fluid motors.

Claim 8

A material handling device comprising, a support, an arm pivoted to said support, a tool pivoted to said arm, a first fluid motor operable to pivot said arm relative to said support, a second fluid motor operable to pivot said tool relative to said arm, pump means providing a pressure fluid source for operation of said motors, first and second valve means, said first valve means being movable between first and second positions to control fluid flow from said source to said first motor and to said second valve means, said second valve means being movable between first and second positions to control fluid flow from said source to said second fluid motor, said second valve means being substantially isolated from said pressure fluid source when said first valve means is in said second position, a separate source of fluid, a first pressure operated means operatively connected to said first valve means and a second pressure operated means operatively connected to said second valve means for moving each of said valve means between said first and second positions, first and second manually movable control valves disposed between said separate source and said first and second pressure operated means, respectively, and being operative to control delivery of pressure to said pressure operated means, and control means operatively connected between said first and second pressure operated means for moving said first valve means from said second towards said first position in response to pressure in said second pressure operated means for simultaneous delivery of fluid from said source to said first and second valve means for independent and simultaneous operation of said first and second fluid motors.

Claim 9

The combination of claim 4 in which said control means includes a pressure controlling valve connected to said first pressure operated means and to said separate source of pressure, said pressure controlling valve being operative in response to pressure in said second pressure operating means to reduce the pressure in said first pressure operating means for movement of said first valve means from said second towards said first position of the latter for communicating said second valve means with said first valve means for said simultaneous and independent pivotal movement of said arm and said tool.