| 摘要 |
A vehicle mounted backing distance gauge is provided, in which an activator bar carried by two side arms, normally biased to an extended position, extends approximately ten inches behind the vehicle, and as the vehicle is backed toward an object such as a loading dock, the activator bar comes into contact with the object and retracts toward a front end of the vehicle. The activator bar is coupled to a plunger beam carried within a casing mounted on the vehicle that moves in concert with the activator bar, and through the use of a bevel gear pair and a follower arm controllably moved by the forward end of the plunger beam, an indicator sign is rotated or pivoted by a shaft coupled to one of the bevel gears from a first position parallel to the side of the vehicle and extending toward the rear of the vehicle, to a diametrically opposed position parallel to the vehicle, but extending toward the front of the vehicle. The movement of the indicator sign is monitored by the driver, and the last increment of approach is highly visibly represented as a bright or high contrast flange face carried by the sign begins to, and ultimately does, disappear behind a wall of a sign housing protruding from the side of the vehicle.
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