Abstract: A relay comprising an electromagnetic coil wound on an insulating bobbin, the central cavity of which encloses a central spring-biased contact actuated by a magnetic armature in response to energization of the coil, to make or break contact with one or more fixed contacts also enclosed. A U-shaped member and a heel plate, both of highly magnetically permeable material, surround the coil and complete the magnetic circuit for flux generated by the coil. The magnetic armature is constructed and arranged such that it is accessible from the exterior of the enclosed relay to adjust the position of the spring-biased contact of the relay after it is assembled to conform with the desired level of voltage required to actuate the relay.

Abstract: A solenoid valve for controlling pneumatic vacuum or pressure comprising a body having a bore. A first passage intersects one end of the bore. The bore defines a first seat adjacent the one end. The body has a second passage intersecting the bore intermediate its ends and a third passage. A coil surrounds a core. The core has a fourth passage therethrough with a second seat at one end. A tube provides communication between the other end of the fourth passage and the third passage. A single plunger is provided in the bore and has a first valve at one end adapted to engage the first seat and a second valve at the other end adapted to engage the second seat.

Abstract: Relay comprising an electromagnetic coil wound an an insulating bobbin, the central cavity of which encloses a central spring-biased contact actuated by a magnetic armature in response to energization of the coil, to make or break contact with one or more fixed contacts also enclosed. A U-shaped member and heel plate, both of highly magnetically permeable material, surround the coil and complete the magnetic circuit for flux generated by the coil. In one modification a permanent magnet interposed into the cavity aids or repulses the flux generated by the electromagnet, depending on their respective directions. In accordance with another modification the bobbin and the enclosing coil are elongated to include a plurality of sets of contacts which are being simultaneously actuated.

Abstract: A sealed proximity switch assembly comprising a housing of non-magnetic material, contacts mounted in the housing, a movable contact member of electrically conductive material mounted within the housing for movement toward and away from engagement with the contacts, a spring yieldingly urging the contact member into engagement with the contacts, and a magnet within the housing and connected to the contact member such that when a portion of a movable member is in proximity with the housing, the magnet is attracted toward the portion moving the contact member out of engagement with the contacts.