IL42470A - Electrical switch responsive to sudden movements - Google Patents

Claims (1)

1. WHAT IS CLAIMED IS: 1. An electrical switching device responsive to sudden movements of a movable member, comprising: a housing carrying the movable, member; an electrical switch disposed interposed between the movable member and the actuator, said flowable material being relatively free-flowing under a low stress but not under a high stress such that it effects a motion-transmitting coupling between the actuator and the movable member upon sudden movement of the latter to move the actuator sufficiently to actuate the switch operator, but upon slow movement of the movable member the flowable material effects a slip- 1 coupling between the movable member and the actuator so that the actuator is not moved sufficiently to actuate the switch operator. 2» A switching device according to Claim , wherein sfcftd flowable material is silicone pufctjs. 3» A switching device according to either of Claims ί or 2, wherein said actuator includes a cylindrical cup open at the top end and containing said flpv/able material and separate element movable with isespect to said cup and embedded in the flowable material. /+. switching device according to Claim 3, wherein the to of the cylindrical cup is rounded to form a ball a rounded portion pivotable within said socket. v ■ . 5... , A switching device according to Claim , wherein said rounded portion of the actuator element is substantially semi- spherical, and said embedded portion is substantially conical. 6. A switching device according to any one of Claims 3-5, wherein said actuator includes a stem depending below said cup, and said housing includes a spring normally biasing s d stem away from the switch operator., 7. A switching device according to any one of Claims 1-6 , wherein said switch casing is carried by a block which is movable to preset the position of the switch operator with respect to the actuator, 8:. A switchin device according to Claim 7, wherein said block is presettable by a threaded cap received within a threaded opening at the bottom of the housing, said cap including a mechanical coupling betv/een it and the block effective to non-rotat bly move the block axially of the housing ϋροη threading the cap into or out of the housing. 9. A switching device according to Claim 8, wherein said mechanical coupling includes a disc formed at the end of the block, and disposed within a semi-circular inturned flange formed at the end of the cap. 10., A switching device according to any one of Claims the housing and pivotably mounted to the housing, and an internal element engageing the actuator within the housing, it. · A switching device according to Claim 10, wherein the movable member is pivotably mounted to the housing by means of a pivot pin disposed perpendicular to the axis o the actuator, 12.. A switching device according, to either of Claims 10 or 11, wherein the external element of the movable member is threaded for receiving a nut to clamp to the movable member the wire whose movement is to be sensed by the switching device. 13. An electrical switching device substantially as described with refere s¾¾y to and as illustrated in the accompanying drawings. Xk-t A wire fence including an electrical switchin device mounted thereon and responsive to sudden movements of the wire, substantially as described and with reference to atra as illustrated in the accompanying drawings. P. O. B. 39251 TEL-AVIV, ISRAEL