US Patent 7434843 Hollow shaft fluid rotary joint

In the preferred embodiments, a hollow shaft rotary fluid joint assembly includes: (a) a hollow shaft through which electrical cables are passed; (b) a rotary fluid joint surrounding an outer diameter of the hollow shaft through which a fluid medium is passed, the rotary fluid joint including inner and outer races defining an interior chamber that are rotatably connected together and that include one or more respective inlet or outlet port.