This is an older version of the receptacle in the first diagram. The slots are different sizes to accept polarized plugs, but it lacks a grounding slot. This device does not make use of a ground wire. There is no protection against electrocution as provide by the grounded receptacle.
If your switches stop working they may be worn out or the screws may have come loose. If you’ve wired a new switch correctly and the circuit still doesn’t work, the switch may be defective. Check that all connections are tight. Check the switch, remove it from the circuit and test for failure with a continuity tester or multimeter set on the Ohms setting.
In order for a 4 way circuit to work, the 3 way switches must be wired properly at the the beginning and end of the path. So be sure that the common terminal on one of the 3 ways is wired to the hot source, and the common on the second 3 way is wired to the the hot terminal on the lights.
This wiring shows the light fixture and the electrical source between the switches. Three-wire cable runs throughout and the hot source is splice to the common on SW1. The common on SW2 is spliced through to the hot on the light fixture. The travelers from SW1 are spliced at the fixture outlet box to run to the 4 way switch.
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