| 摘要 |
<p>PURPOSE: To simplify control and to operate working equipment in the state of floating it during an operating term by controlling a hydraulic lift motor through a specified control means. CONSTITUTION: A hydraulic lift motor is connected through a line 28 to the outlet of a pressurized hydraulic fluid source, and a control valve 40 is arranged inside a line connecting the line 28 and a reserver. An adjusting member 82 is screwed into an inner screw part 80 of a valve spool 60, which can be slid in a central bore 48, and connected through a screw shaft 74 to a control knob 88. A variable orifice body structure 106 near the control terminal part of the spool 60 houses a poppet 110 and makes it eccentric to a closing position through a coil spring 114 with the adjusting member 82. The amount of the control valve 40 to be turned corresponding to the fluid flow can be increased/ decreased by the control knob 88 and a working equipment lift function and a working equipment weight transmitting function can be selectively provided.</p> |
