| 摘要 |
A magnetically actuatable tamper switch assembly comprising a housing of nonmagnetizable material as elongated in a longitudinal direction, wherein a plunger is operable to be longitudinally moved through an aperture in the first end of said housing, wherein the improvement comprises substituting the mechanical wiper contacts of prior art tamper designs with an elongated bar magnet and associated elongated reed switch set of components. The present invention uniquely takes advantage of both the interior housing space available in the conventional tamper switch housing and also the reaction of an overlapping reed switch region to the lines of flux which eminate from a given pole of a magnet material. The magnet is moved parallel to the longitudinal movement of the axis, and the magnet is magnetized in a direction parallel to that longitudinal axis, so that it will approach a transversely disposed switch element in an offset manner, to ensure that as the magnet is urged towards the second end of the housing, and into proximity with the reed switch, the magnetic fluxes will be strongest upon only one of the two reeds, to thereby generate an attractive force between the reeds, and close an electrical circuit between the two electrical contacts also mounted at the second end of the housing.
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