| 摘要 |
A rotary coupling apparatus includes a stationary housing defining a chamber, an elongated hollow shaft extending through the chamber of the housing and rotatable relative thereto, a drum supported about the shaft and rotatable therewith, and an elongated coupling cable for carrying communications elements being disposed in the chamber and interconnecting the stationary housing with the rotatable drum. The stationary housing has a pair of spaced end walls and a circumferential side wall disposed therebetween. The end walls define the chamber therebetween and the circumferential side wall defines an outer periphery of the chamber. The shaft extends through the chamber between the end walls and is mounted to undergo rotation relative to the end walls. The circumferential side wall is radially spaced outwardly from and extends about the rotatable shaft and drum. The coupling cable terminates in a pair of opposite end portions, a first being secured to the stationary housing and a second being secured to the rotatable drum and shaft such that the second end portion of the coupling cable rotates with the drum and shaft as the first end portion of the coupling cable remains stationary with the stationary housing. The coupling cable is adapted to wind about the rotatable drum away from the circumferential side wall of the housing until reaching a wound condition about the drum and to unwind from the drum toward the circumferential side wall of the housing until reaching an unwound condition as the drum and shaft undergo rotation in clockwise and counterclockwise directions relative to the housing.
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