초록 ▼

A hatch assembly has an annular seat, a hatch cover and a plurality of latching units. Each latching unit has a slidably supported locking bolt movable generally radially inwardly with respect to the annular seat into a hatch cover locking position and generally radially outwardly into a hatch cover

A hatch assembly has an annular seat, a hatch cover and a plurality of latching units. Each latching unit has a slidably supported locking bolt movable generally radially inwardly with respect to the annular seat into a hatch cover locking position and generally radially outwardly into a hatch cover releasing position. In the hatch cover locking position at least one length portion of the locking bolt extends over the hatch cover for maintaining the hatch cover on the annular seat. Each latching unit further has a rotary crankshaft, an operating handle torque-transmittingly connected to the crankshaft for applying a locking torque and an opposite, releasing torque thereto; and a coupling mechanism for connecting the crankshaft with the locking bolt and for converting rotary motion of the crankshaft to linear motion of the locking bolt. The coupling mechanism has a spring for transmitting the locking torque from the crankshaft as a radially inwardly oriented resilient force to the locking bolt. The radially inwardly oriented resilient force is resolved to a component force with which the locking bolt presses the hatch cover against the annular seat.

대표청구항 ▼

In a nuclear reactor installation including means defining a fuel handling area and means defining a containment area separated from the fuel handling area and including a refuelling cavity; the improvement comprising (a) a fuel transfer tube connecting the refuelling cavity with the fuel handling a

In a nuclear reactor installation including means defining a fuel handling area and means defining a containment area separated from the fuel handling area and including a refuelling cavity; the improvement comprising (a) a fuel transfer tube connecting the refuelling cavity with the fuel handling area; said fuel transfer tube having a first end in the fuel handling area and a second end in the refuelling cavity; (b) valve means for opening and closing said first end; and (c) a hatch assembly mounted on said second end; said hatch assembly including (1) a hatch ring affixed to said fuel transfer tube at said second end thereof; said hatch ring having an integral annular seat surrounded by said hatch ring and defining a hatch opening in said second end of said fuel transfer tube; (2) a hatch cover adapted to be positioned on said annular seat for covering the hatch opening; (3) a plurality of latching units supported on said hatch ring about said hatch opening, each said latching unit including (i) a slidably supported locking bolt movable generally radially inwardly with respect to said annular seat into a hatch cover locking position and generally radially outwardly with respect to said annular seat into a hatch cover releasing position; in said hatch cover locking position at least one length portion of said locking bolt extending over said hatch cover for maintaining said hatch cover on said annular seat; (ii) a crankshaft supported for rotation; (iii) operating means for transmitting a locking torque and an opposite, releasing torque to said crankshaft; (iv) coupling means for connecting said crankshaft with said locking bolt and for converting rotary motion of said crankshaft to linear motion of said locking bolt, said coupling means including spring means for transmitting the locking torque from said crankshaft as a radially inwardly oriented resilient force to said locking bolt; and (v) means for resolving the radially inwardly oriented resilient force to a component force in said hatch cover locking position and for transmitting said component force from said locking bolt to said hatch cover for pressing said hatch cover against said annular seat.