Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1977-02-02
1978-05-02
Stephan, Steven L.
Electricity: circuit makers and breakers
Liquid contact
Time delay
H01B 340
Patent
active
040876667
ABSTRACT:
A switch device for a printed circuit board and the resulting circuit structure. The device comprises a mounting stud with a pilot threaded section and a working threaded section axially separated by an unthreaded shank and means for mounting the stud to a printed circuit board; and a hollow shell having a locknut mounted on its interior. The distance between the two threaded sections is greater than the interior threaded axial length of the locknut.
The circuit structure is intended to provide an optional switch between a first conductor on the upper surface of a printed circuit board and a second conductor on the bottom surface of the printed circuit board. The mounting stud is permanently secured to the circuit board in a hole formed in the board passing adjacent one of the conductors and close to but spaced from the other of the conductors. When the stud is mounted to the board it is soldered into an electrical conductive connection with the conductor that is adjacent the hole and protrudes from the other side of the circuit board, being thereby spaced from the other conductor. The assembled shell with locknut is screwed onto the pilot end of the stud, the threaded portion of the nut passing the pilot threaded section. The shell assembly freely moves to the working threaded section where continuing rotation causes the locknut thread to engage after which the shell assembly can be worked down toward the surface of the board. Screwing it tightly against the surface causes electrical contact to be established between the conductors on the top and bottom surfaces of the board through the enlarged axial end of the shell, stud and soldered connection. If the contact is not desired, the shell assembly can be backed off a couple of turns to lift its axial end off the conductor spaced from the stud.
An important feature of the invention is the captive effect of the unthreaded shank and the pilot threaded section combination which prevents the shell from vibrating free of the stud.
REFERENCES:
patent: 2064736 (1936-12-01), Dahl
patent: 2145041 (1939-01-01), Childers
patent: 2854552 (1958-09-01), Gourerneur
patent: 3287532 (1966-11-01), Boseler
Abbott Screw & Mfg. Co.
Stephan Steven L.
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