| 摘要 |
<p>The operator of a lift truck or other load supporting vehicle (11) having a tiltable mast (12, 12a) is alerted as the mast (12, 12a) tilts beyond a predetermined orientation by a temporarily slowing of the rate of tilting movement. Return motion of the mast (12, 12a) may be unimpeded. The operator is reliably made aware when the mast (12, 12a) reaches a predetermined limit but may continue the tilting motion when that is necessary for such purposes as traveling the vehicle (11) under overhead obstruction. In systems where the mast (12, 12a) is tilted by fluid motors (20, 20a), the automatic tilt speed reduction may be realized with a valve (33, 33a) which temporarily introduces a one way flow restriction (49) into the fluid flow path (28, 28a) between the motors (20, 20a) and pressurized fluid source (27, 27a), the valve (33, 33a) being actuated by inclination sensing mechanism (23, 23a).</p> |
