Abstract: The construction of an expansion joint for use in the inner power conductor of a coaxial transmission line whereby the heat generated in the line may flow through the joints from the hotter areas to the cooler areas and conventional heat sinks with such ease and rapidity that there will be no destructive temperature buildup at any of the joints in the line. This is accomplished in major part by the introduction within each joint of a short section of metallic tubing of good heat conductivity that is in contact with both parts of the joint in heat transmitting relation. The tubing in combination with the novel joint construction greatly increases the rate of heat flow from the hotter part of the joint to the less hot part. The tubing is preferably fixed to one part of the joint and in sliding engagement with the other but it may be in sliding engagement with both parts.

Abstract: A mechanical transfer switch for use primarily in making rapid change of circuits in high energy coaxial transmission lines of the type employed in transmitting energy to a radio or television antenna. The switch is preferably manually actuated and includes structure in which a pivoted conductive bar is compelled to make simultaneous connection with or separation from the spaced terminals of the inner power conductors of a coaxial transmission line. The conductive bar includes two identical connectors which simultaneously engage two spaced terminals on the separated ends of the inner coaxial power line. The connectors on the conductive bar cannot be moved into connecting position with the two terminals until they are in exact axial alignment. In one form, the switch can connect a common terminal with anyone of a plurality of other terminals. In another form, the switch can be arranged to shift the connection between one pair of terminals to a connection between a second pair of terminals.

Abstract: Means for connecting together sections of a radio frequency transmission line. The connection is electrically correct, waterproof and substantially self-aligning so that even under adverse assembly conditions proper connection of the ends of the sections can be readily made.