| 摘要 |
A loader comprises a pair of lift arms pivotally mounted on a forward end of a frame thereof. A double-acting hydraulic cylinder is interconnected between the frame and each lift arm to move the lift arms between lowered and raised positions. A loader bucket is pivotally mounted on a forward end of the lift arms and a gauge is provided to indicate the magnitude of load retained in the bucket. A valve is connected to the cylinder to receive a pressure signal therefrom which is communicated to the gauge upon opening of the valve. A control means, including a cam attached to one lift arm for movement therewith, sequentially (1) initially applies a closing force to the valve when the lift arms are in their lowered positions, (2) permits the valve to open to communicate the pressure signal to the gauge when the lift arms are moved to a predetermined height above ground level, and (3) maintains the valve in its same open condition to continue communication of the pressure signal to the gauge when the lift arms are further moved towards their raised positions.
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