Patent ID: 8251628

Claim:
A joint tong apparatus for a radiation shielding facility comprising: a spherical ball having a through-hole passing therethrough; a spherical socket set having an inner spherical socket and an outer spherical socket, which are formed so as to correspond to an outer surface of the spherical ball, the spherical socket set is configured to be installed in a hole formed in a partition between a radiation-shielded room and a control room so as to enclose the spherical ball on inner and outer sides; a bar inserted and coupled into and to the through-hole of the spherical ball, and including three cable through-holes passing through an inside of the bar in parallel in a longitudinal direction; an inner joint assembly having a first housing coupled to a first end of the bar on the side of the shielded room and a first pivot member mounted on a free end of the first housing so as to be able to be pivoted within a predetermined angle; an outer joint assembly having a second housing coupled to a second end of the bar on the side of the control room and a second pivot member mounted on a free end of the second housing so as to be able to be pivoted within a predetermined angle; a tong assembly including a tong for grasping an object and a restoring spring for keeping the tong open at ordinary times, and coupled to the inner joint assembly through the first pivot member; a handle assembly including a handle and a handle lever, and coupled to the outer joint assembly through the second pivot member; a tong manipulation cable connected to the tong at a first end of the cable on the side of the shielded room, and sequentially passing through the inner joint assembly, bar, and outer joint assembly, connected to the handle lever at a second end of the cable on the side of the control room, and closing the tong when the handle lever is manipulated; and a pair of pivot manipulation cables fixed by winding to the first pivot member at first ends thereof on the side of the shielded room, sequentially passing through the first housing, bar, and second housing, fixed by winding to the second pivot member at second ends thereof on the side of the control room, wound around the first and second pivot members in different directions, and enabling the tong assembly to be pivoted in opposite directions by means of manipulation of the handle assembly, wherein the inner spherical socket and the outer spherical socket are coupled with each other by guide bolts, and are configured to be spaced apart from each other by a constant distance by means of restoring springs.