| 摘要 |
A wheel chock is provided with an upstanding handle to assist in moving the wheel chock into and out of operative engagement with a wheel. First and second photo sensor assemblies are mounted in the wheel chock and the handle, respectively, for sensing the presence of a wheel in close proximity to the wheel chock. A signal light assembly is mounted adjacent a loading dock and is operatively connected to the photo sensor assemblies for indicating whether or not a wheel chock is disposed is blocking relation to a wheel and to indicate when the wheel chock is not connected to source of power.
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