Abstract: A printed circuit board circuit tester comprising a testing head, electrical connectors carried by said head, wires and joined electrical contacts extending into said head from said connectors, the electrical contacts being fitted in a non-conducting environment supported in the head, supporting structure within the head adapted to support a circuit board to be tested, the electrical contacts extending through the non-conducting environment to a position adjacent the circuit board, apparatus operated by pressure differentials within the head for moving the circuit board into testing contact with the electrical contacts, a base on which said head is removably supported, base electrical connectors carried in said base and being adapted to mate with the electrical connectors carried in the head when said head is supported on said base, and wires and joined base electrical contacts extending from said base connectors into said base, said base electrical contacts being exposed through the base for connection to an

Abstract: A tester for printed circuit board circuits having an elastomeric member on which printed circuit boards are positioned for testing. When a pressure differential is created across the member, the circuit board being tested is moved into contact with electrical leads connected to a computer programmed with respect to the circuits being tested. The circuit board is supported on the elastomeric member by a thin non-conducting, sealing foam sheet having a cutaway central portion to permit the circuit to make contact with the leads which extend through openings in the elastomeric member and outwardly thereof. Under the thin foam is, preferably, a non-conducting sheet of thicker foam, both layers of foam being supported on the elastomeric member, and being movable by the pressure differential to lower the foam layers with respect to the electrical leads and also to lower the circuit board to make contact with the leads.

Abstract: Apparatus for spacing and moving parts, as in a hydraulically operated molding press, arranged for relative movement in which there are means for engaging with and disengaging from the parts at predetermined positions. In a molding press, the apparatus is fitted internally and operates to separate the two mold cavity plates from the fixed clamp plate, positioning the three plates in a spaced relationship. The apparatus also provides for an early return of the ejector plate to in effect withdraw the ejector pins from the mold cavities before the mold closes after the molded piece has been ejected.