Magnetic reed switches

Claim 1

A SWITCH COMPRISING A SEALED TUBE, A PAIR OF ELECTRICALLY AND MAGNETICALLY CONDUCTIVE ELECTRODES MOUNTED BY SAID TUBE HAVING TERMINAL PARTS OUTSIDE THE TUBE AND HAVING CONTACT PARTS WITHIN THE TUBE IN SPACED RELATION, AN ELECTRICALLY AND MAGNETICALLY CONDUCTIVE DEFLECTABLE REED MOUNTED IN SAID TUBE AND HAVING A TERMINAL PART OUTSIDE THE TUBE, SAID REED EXTENDING LONGITUDINALLY OF THE TUBE BETWEEN AND IN OVERLAPPING RELATION WITH THE CONTACT PARTS OF SAID ELECTRODES FOR DEFLECTION INTO AND OUT OF ENGAGEMENT WITH THE CONTACT PARTS, SAID REED WHEN UNSTRESSED ASSUMING A NEUTRAL POSITION WHEREIN IT IS MIDWAY BETWEEN AND SPACED FROM SAID FIXED CONTACT PARTS, AND A PERMANENT MAGNET ON A SINGLE ONE OF SAID ELECTRODES BETWEEN THE ENDS OF SAID ONE ELECTRODE AND SPACED LONGITUDINALLY FROM SAID REED AND SPACED FROM THE OTHER OF SAID ELECTRODES FOR ATTRACTING SAID REED TOWARD THE CONTACT PART OF SAID ONE ELECTRODE, SAID MAGNET BEING POSITIONED WITH ITS POLES SPACED LONGITUDINALLY OF SAID TUBE, SAID MAGNET, SAID REED AND THE CONTACT PART OF SAID ONE ELECTRODE BEING IN SERIES IN A MAGNETIC CIRCUIT FOR MAGNETIC FLUX FROM THE MAGNET WHICH FLUX TRAVERSES THE MAGNET AND THE REED IN THE SAME DIRECTION SUBSTANTIALLY LONGITUDINALLY OF SAID TUBE, SAID REED WHEN ATTRACTED TO AND ENGAGING EITHER OF SAID CONTACT PARTS DEVELOPING A SPRING FORCE WHICH URGES THE REED AWAY FROM THE ENGAGED CONTACT PART TOWARD THE OTHER CONTACT PART.