FIELD: materials handling facilities. SUBSTANCE: installed on boom of lifting device is brace which serves to lock boom in raised position. One end of brace is hinge-connected, and the other end is mounted on detachable pin. When boom is lifted up, brace, released from pin, turns to register its holes with hole in eye on lifting cylinder. Holes in alignment are connected by pin. EFFECT: enlarged operating capabilities. 2 cl, 5 dwg
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