| 摘要 |
<p>An alarm actuating picket barrier intrusion sensor device including a t-shaped rocker element (34) for rigid attachment to the upper end of a picket (22) and for disposition within the rail (14) providing support for the picket, an elongated rocker spring (50) pivotally engaged at its mid-point by a pin (32) passed through the end of the picket and including downwardly turned end legs (52) for engaging the lower wall of the rail and for exerting a biasing force on the picket tending to resist downward translation thereof, and a length of dual conductor ''tape switch'' (60) which extends generally along the longitudinal axis of the rail and passes between the rocker element and the rocker spring, whereby downward forces applied to the picket, or lateral forces tending to bend the picket, cause the tape switch to be pinched between at least one extremity of the rocker spring and a portion of the rocker element.</p> |
