Abstract: A d-c electromagnetic relay, designed to open or close a circuit when a current through its exiting coils is either caused to flow or interrupted, and in some applications merely varied in magnitude. It consists of a square or rectangular coil(s) of conducting wire wound around a non-magnetic spool mounted on a "J" shaped magnetic yoke-core which in turn supports an "L" shaped armature attached to the shorter leg of the yoke at a given angle and thereby creating two non-parallel surfaces at the boundaries of the working air gap forming an open "V" at an angle that corresponds to the degree angle formed by the longer leg of the armature in relationship to the top surface of the shorter leg of the yoke, by means of a flat piece of phosphor bronze or the like designed integrally as a leaf spring spring to provide the necessary contact pressure in the open as well as in the closed position, and contact deflection and follow-through, and which is extended to accept the contact point(s).

Abstract: A d-c electromagnetic solenoid designed to open or close circuit breakers, for operating valves, and any other applications which a relatively large force is applied to a member which moves a relatively short distance through the conversion of electrical energy into optimum mechanical work from magnetic attraction.