| 摘要 |
A safety switch light fence for vehicles such as fork lift trucks has a photoelectric cell system positioned across a vehicle exit opening in an area where an operater's foot is disposed when the operator allows his foot to protrude from the cab. At least one of a signaling device and an automatic cut-off are activated when protrusion of an operator's leg or foot is sensed. One or more light beams are directed across the exit opening. A foot switch can be used to sense proper placement of the operator's feet in the cab and to disable the photoelectric cell system, alarm and/or cut-off if the feet are safely stowed.
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