Abstract: A tamperproof handset for use in a railroad communication system. The handset has a cable provided with plural wires which electrically connect the handset with a communication control. The control is provided with a housing having a front panel. The cable extends through a passage in a male connector section having a key section, a swaged section and a slotted section. The slotted section is provided with an annular slot. A female connector section has a slotted section and a threaded section. The male key section matingly engages the female slotted section. The threaded section of the female connector is threadedly secured to the front panel within a threaded hole in the front panel. A "C" shaped retainer is frictionally secured to the male slotted section to prevent displacement of the male connector section with respect to the female connector section. A jam nut is threadedly secured to the female connector threaded section and contacts the control housing to prevent rotation of the threaded section.

Abstract: The handset has a cable provided with plural wires which electrically connect the handset with a communication control. The control is provided with a housing having a front panel. The cable extends through a passage in a connector having a flange, a swaged section disposed on one side of the flange, and a slotted section provided with an annular slot disposed on the other side of the flange. The flange is substantially flush with the outer surface of the housing front panel. The flange is provided with a locating pin which extends through an aperture spaced from the hole in the panel. The locating pin prevents rotation of the connector. A "C" shaped retainer is frictionally secured to the slotted section to prevent displacement of the connector with respect to the front panel. The cable is surrounded by a neoprene sleeve section which is deformed within the passage in the connector to prevent withdrawal of the sleeve section and cable from the connector.

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.