Geometrical instruments
Patent
1978-09-18
1981-10-06
McQuade, John
Geometrical instruments
339150B, 339255R, H01R 2128
Patent
active
042931746
ABSTRACT:
An electrical circuit tester for use in testing terminal blocks having protruding electrical connectors, the tester comprising a body made from an insulating material, the body having a plurality of circuit testing assemblies, each assembly including a chamber, each chamber including a chamber extension extending to the exterior of the body and capable of receiving the electrical connectors. Positioned within each chamber is a piston having a piston rod extending therefrom, the piston rod extending into the chamber extension. The chamber includes a piston retaining wall having an aperture through which the piston rod moves. When the piston rod is in its fully extended state, there is room in the chamber extension to receive the electrical connector. Positioned within the chamber is a conductive grommet and a resilient conductive spring which contacts the grommet and functions to urge the piston and piston rod to the fully extended position. Conductors extend from the grommets to the exterior of the tester, and may eventually be connected to an electronic apparatus for testing the circuits in the telephone terminal blocks.
REFERENCES:
patent: 2736870 (1956-02-01), De Jur et al.
patent: 3412367 (1968-11-01), Churla
patent: 3864629 (1975-02-01), Danna
patent: 4002389 (1977-01-01), Mammel
patent: 4179171 (1979-12-01), Shannon
Brown John S.
McQuade John
The Siemon Company
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