Importance

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Abstract

The housing of a signal generating and transmitting apparatus carries a reciprocable shroud which is movable relative to the housing between a first position in which the electric terminals of the housing are exposed and can be connected to conductors, and a second position in which the terminals are confined in the shroud. Detents are provided on the housing and on the shroud to releasably hold the shroud in the first and second positions as well as to prevent detachment of the shroud from the housing. If the housing carries a casing for one or more radiation sources, the parts which releasably secure the casing to the housing can be disengaged from each other in response to movement of the shroud to the third position in which one or more disengaging members of the shroud separate the securing elements on the casing from complementary securing elements on the housing.

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First Claim