This has driven me mad, I've searched for this on google and am now going to the world to find out what the part is called. I've tried things like "Gang bar", "shared cover", did a google image search of the two images I have, and anything else I could think of, but without knowing what it is I cannot accurately search for it. It's a part that can connect multiple toggles together for an action, usually to "off", sometimes allowing for individual "on" activation. Attached are two pictures to assist. It's the Black bar on the brass switches image and the two Chrome bars on the other image. Any help is appreciated.
Multiple switches that are physically ganged together could be represented with a dashed line between the individual throws, like this:
Other physical connections between switches, like the ones in your pictures, are more of a mechanical component than an electrical one, and would typically be omitted from a schematic. There is no standard symbology I'm aware of for such a thing.
This is related to many older schematic symbols like multi section switches and ganged variable capacitors/potentiometers. Just join the arrow or dot ends of the switch toggles, if the switches use these, or the bars of the switches with dashed lines. In either Eagle, Altium or PADS, place a "part" consisting of a polygon on the dashed line and give that a part number including a description. This is a mechanical part just like a screw or standoff that would go into a standard Bill Of Materials. What we do when we need these sorts of things is to link that part number to a mechanical CAD drawing of the linkage device. Ages ago, for a gangable potentiometer used a lot in vacuum tube designs there was a separate rod with detents and we had to assemble the 3, 4 or 5 gang pots and insert the rods by hand. It was just called a Multipot Linkage.
In the Dr. Strangelove movie there's a scene where they release the safetys. They are pairs of toggle switches connected by a metal tab. I'm not sure if it's a real thing or made up for the movie, but if you could find out what those are called maybe it would give you a clue.