초록 ▼

A quick opening hatch for use on a transfer tube of a nuclear reactor plant that is adapted to replace the conventional hatch on the transfer tube. A locking ring is provided with a plurality of screw openings that is adapted for connection to the transfer tube, and a hatch cover fitably received wi

A quick opening hatch for use on a transfer tube of a nuclear reactor plant that is adapted to replace the conventional hatch on the transfer tube. A locking ring is provided with a plurality of screw openings that is adapted for connection to the transfer tube, and a hatch cover fitably received within the locking ring for closing-off the transfer tube. To lock the cover to the ring, latches are movably connected with the cover for locking engagement with the locking ring, and a sprocket with a plurality of crank arms is movably connected with the cover and the latches for movement thereof into locking engagement with a latch housing on the locking ring for locking the cover to the ring and out of engagement with the latch housing for releasing the cover from the locking ring so as to permit removal of the hatch cover from the locking ring to provide access to the transfer tube. A davit assembly is provided which is connected with the transfer tube and the hatch cover to move the cover away and to provide guidance for closing-off the transfer tube. The locking ring and hatch cover also include cooperating keys and keyways for alignment when closing the transfer tube. The cover is provided with sealing rings and the latch housing and latches include cooperating cam surfaces to provide a tight locking engagement by compressing the sealing rings between the transfer tube and the hatch cover.

대표청구항 ▼

A quick operating hatch assembly for sealing and unsealing an opening at an outer peripheral end of a transfer tube located in a lower portion of a containment pit of a nuclear reactor building, wherein said opening is surrounded by a circumferential weldment, comprising: a locking ring connected to

A quick operating hatch assembly for sealing and unsealing an opening at an outer peripheral end of a transfer tube located in a lower portion of a containment pit of a nuclear reactor building, wherein said opening is surrounded by a circumferential weldment, comprising: a locking ring connected to said weldment; a hatch cover fitably received within said locking ring and having a base portion seatable onto said weldment; locking assembly means including latching means movably connected with said hatch cover, housing means in said locking ring, and latching means movable means connected with said hatch cover and said latching means for movement thereof into locking engagement with said housing means for locking said hatch cover to said locking ring and out of engagement with said housing means for releasing said hatch cover from said locking ring whereby to permit removal of said hatch cover from said locking ring to provide access to the transfer tube; and external drive connection means normally not connected to, and remotely operable from a location above the containment pit to be remotely connected to and detached from said latching means movable means and operable when so connected to remotely and selectively drive said latching means movable means in a direction to affect correspondingly either closure or opening of said latching means from a location external of said pit; and a davit assembly pivotally coupled with said weldment and means coupled to said hatch cover for pivotally moving said hatch cover away from the transfer tube after release therefrom and for initially aligning said hatch cover with the transfer tube prior to locking thereto, said coupling means including an acme threaded screw rotatably coupled to said davit assembly for raising and lowering the hatch cover, and means coupled to said acme threaded screw for rotation thereof and operable from a location above the containment pit substantially above the elevation of the davit assembly to affect such rotation.