HATCH-TRAPDOOR Russian patent published in 2011 - IPC F16J13/16 F16J13/10 

FIELD: machine building.

SUBSTANCE: hatch-trapdoor consists of neck with flange, of swinging bracket, of pivoted cover, of packing ring, of thrust ring, of two movable half-rings with internal grooves of rectangular cross section, and of gate with holder. The swinging bracket is equipped with a lever for preliminary compression of the packing ring. In a closed state the pivoted cover, the packing ring and the thrust ring enter a cylinder bore of the flange. The movable half-rings are brought together, while their internal grooves envelope flanges of the thrust ring and the neck. The gate with the holder retains the half-rings from self-opening. Force of medium pressure onto the cover is received with the half-rings, while the packing ring is deformed between a collar of the cover, the thrust ring and the cylinder bore of the flange facilitating reliable sealing of the hatch-trap-door. The holder is made in form of a power cylinder with a piston and rod. The cylinder is positioned in the cover, a piston cavity is connected with a reservoir, while the rod blocks the swinging bracket under influence of medium pressure.

EFFECT: reduced labour output at fabrication and operation of hatch-trapdoor.

2 cl, 2 dwg