Tamperproof handset for railroad applications

Details Tamperproof handset for railroad applications Tamperproof handset for railroad applications

1977-01-21

1978-05-02

Brown, Thomas W.

Electricity: conductors and insulators

Feedthrough or bushing

Compression

174 65R, 179103, 179178, H04R 106

Patent

active

040876594

ABSTRACT:
A tamperproof handset for use in railroad communication systems has a cable which interconnects it with a communications control panel. The transmitter end of the handset and a cap therefor have mating threads. A screw passes through a hole in the transmitter cap and tightens down onto the threaded peripheral surface of the transmitter end to prevent removal of the cap. A bushing having a flange and a threaded portion is received within a hole in the panel of the communication control. A nut screws onto the threaded portion of the bushing and secures the bushing to the panel. The cable passes through a hole in the bushing and is wired to appropriate terminals within the control.

REFERENCES:
patent: 2226733 (1940-12-01), McLarn
patent: 3377442 (1968-04-01), Foster, Jr.

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