| 摘要 |
A warning system is disclosed for use on a concrete mixer to indicate that a charge hopper 28 is in a raised position. Such concrete mixers include an air supply, a mixing drum having an access port, a frame supporting the mixing drum, and a charge hopper 28 that is pivotally supported adjacent the access port. The charge hopper 28 is moveable between a raised position and a lowered position. The warning system includes an indicator device 70 operatively associated with the concrete mixer and configured for activation to indicate when the charge hopper is in the raised position. A valve 44 is operatively associated with the frame and in fluid communication with the air supply 14 and the indicator device 70. The valve 44 includes an actuator moveable between a first position to deactivate the indicator device and a second position to activate the indicator device. A contact structure 50 is operatively associated with the charge hopper to actuate the valve.
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