초록 ▼

A number of systems exist wherein a plurality of hydraulic motors (28a, 28b, 28c) receive pressurized fluid from a single pump (14) which is itself driven by an electric motor (12). Apparatus has been available for adjusting the power supplied to the electric motor (12), and thereby adjusting the pu

A number of systems exist wherein a plurality of hydraulic motors (28a, 28b, 28c) receive pressurized fluid from a single pump (14) which is itself driven by an electric motor (12). Apparatus has been available for adjusting the power supplied to the electric motor (12), and thereby adjusting the pump (14) flow rate, in response to the operator activating one or more of the hydraulic motors (28a, 28b, 28c). However, such apparatus has generally been bulky, complicated and/or difficult to install and/or service. An improvement is provided wherein a single switch (22) is placed in either an open or closed position as an elongated member (34) placed transversely to a plurality of generally parallel rod member (20a, 20b, 20c) is rotated in response to longitudinal travel in either direction from a neutral position (32) of one of the rod member (20a, 20b, 20c). Longitudinal movement of each of the rod members (20a, 20b, 20c), controls, via a respective valve (16a, 16b, 16c), the action of the respective hydraulic motor (28a, 28b, 28c).

대표청구항 ▼

In a hydraulic system (10) having an electric motor (12) driving a pump (14) which supplies pressurized fluid to a control valve arrangement (16) having a plurality of control valves (16a, 16b, 16c) each controlled by movement of a corresponding control spool (18a, 18b, 18c); a plurality of longitud

In a hydraulic system (10) having an electric motor (12) driving a pump (14) which supplies pressurized fluid to a control valve arrangement (16) having a plurality of control valves (16a, 16b, 16c) each controlled by movement of a corresponding control spool (18a, 18b, 18c); a plurality of longitudinally movable rod members (20a, 20b, 20c) each having a rod member neutral position (32) and each being connected to one of said spools (18a, 18b, 18c), said spools (18a, 18b, 18c) each having a spool neutral position corresponding to the rod member neutral position (32) and being movable from said spool neutral position in response to generally longitudinally movement of a respective rod member (20a, 20b, 20c) from said rod member neutral position (32); a single switch (22) having first and second position, one of said positions being open and the other being closed; a circuit (24) controllably supplying power to said motor (12), said circuit (24) supplying a relatively greater amount of electric power to said motor (12) and causing the output of said pump (14) to increase in response to said switch (22) being moved to a selected one of said first and second positions, the improvement comprising: an elongated actuating member (34) having a neutral position (51) and a rotated position (52); means for mounting said elongated actuating member (34) transverse to said rod members (20a, 20b, 20c) and for pivoting about an axis (40) generally orthogonal to said rod members (20a, 20b, 20c), said axis (40) being generally in a plane (67) which is generally parallel to said rod members (20a, 20b, 20c); means (56) for biasing said actuating member (34) in a direction towards said neutral position (51); means (60) for engaging said rod member (20a, 20b, 20c) and said actuating member (34) for pivoting said actuating member (34) in one direction (50) from said neutral position (51) towards said rotated position (52) in response to longitudinal movement of one of said rod members (20a, 20b, 20c) in either direction from said neutral position (51); and means (48) for positioning said switch (22) in said selected one of said first and second positions in response to said actuating member (34) being at said rotated position (52). In a hydraulic system (10) having an electric motor (12) driving a pump (14) which supplies pressurized fluid to a control valve (88) having a control spool (90) controlled by movement of a generally longitudinally movable rod member (92), said rod member (92) being movable in a first (108) and a second (112) direction, a control element (100) adjacent said rod member (92), means (102) for moving said control element (100) in response to generally longitudinal movement of said rod member (92), means (96) for varying the amount of electric power supplied to said motor (12) in response to movement of said control element (100) and means (128) for preventing said control element (100) from being moved in one direction beyond a preselected position, the improvement comprising: means (110) for permitting said rod member (92) to continue to move in said second longitudinal direction (112) after said control element (100) is at said preselected position.