Reed switch adjustment

Claim 1

A REED RELAY COMPRISING A SEALED ENVELOPE, A PAIR OF MAGNETIC REEDS HAVING COOPERABLE CONTACT REGIONS EXTENDING IN OVERLAPPING RELATION WITH EACH OTHER TO FORM AN AIR GAP IN SAID ENVELOPE AND ACTUATABLE BY MAGNETIC FLUX TO BRING SAID CONTACT REGIONS TOGETHER, A SOLENOID HAVING A CENTRAL OPENING ENCIRCLING AT LEAST A PORTION OF THE ENVELOPE AND ENERGIZABLE TO PROVIDE A MAGNETIC FLUX WHICH FOLLOWS A PATH INCLUDING SAID REEDS AND AIR GAP TO ACTUATE SAID REEDS, ADJUSTABLE MEANS INCLUDING A MEMBER OF MAGNETIC MATERIAL EXTENDING ALONG AT LEAST A PORTION OF SAID ENVELOPE WITHIN SAID SOLENOID OPENING IN A DIRECTION GENERALLY PARALLEL TO THE FLUX FLOW INCLUDING MEANS SUPPORTED EXTERIORLY OF SAID CENTRAL OPENING CONNECTED TO SAID MEMBER FOR MOVING SAID MEMBER FROM A FIRST POSITION DIRECTLY OVER SAID AIR GAP IN WHICH SAID MEMBER IS OPERABLE TO PROVIDE A MAXIMUM RELUCTANCE OF SAID MAGNETIC PATH TO A SECOND POSITION TOWARD ONE END OF SAID ENVELOPE IN WHICH SAID MEMBER DECREASES THE RELUCTANCE OF SAID MAGNETIC PATH, TO A VALUE WHICH IS LESS THAN THE RELUCTANCE IN SAID PATH WITHOUT SAID MEMBER, WHEREBY AN INCREASED RANGE OF VARIABLE PULL-IN AND DROP-OUT VALVES IS OBTAINED.