SLIDING SHUTTER Russian patent published in 2003 - IPC

FIELD: devices for closing of wall opening into zoo room for keeping animals inside thereof. SUBSTANCE: shutter comprises door, vertical guide, counterweight located in counterweight guides. Door and counterweight are connected by cable through pulleys. Counterweight has handle for door manual opening. Door has runaround block and catch with orifices which are installed on counterweight, and safety clips. Cable passes about runaround block and creates two branches. Cable branches are let through orifices and ends thereof passed through main and supplementary pulleys fixed to door are diametrically opposed to each other. Safety clips are fastened to cable branches in immediate proximity to catch. When breaking any cable branch or cable in area of contact with runaround block clips come into cooperation with catches to prevent counterweight and door from falling. When door is lifted over wall opening weight is fixed by hook. In its closed position door is locked by slider having lock. EFFECT: increased performance. 1 dwg