| 摘要 |
A magnetic locator employs a loudspeaker to produce an audible signal which indicates detection of a magnetic object. The loudspeaker is mounted on a frame in a housing and is spring biased against an end wall of a cover part of the housing. Openings through the housing wall for passage of sound are protected by a shield which, together with a plateau on the exterior of the housing wall, provides an annular space for omnidirectional radiation of acoustic energy. Mounting screws for the loudspeaker project from the frame through holes in the housing wall and receive nuts for securing the cover part of the housing to the frame. When the cover part is secured to the frame, elastomeric washers on the screws inside the housing are positioned automatically, and biasing springs on the screws are partially compressed.
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