FIELD: building industry. SUBSTANCE: gateway has a bed shifting along the guides with the aid of wheels, a pull rope and a spring-loaded clamp connected with it through a block. The gateway is equipped with an immobile step-shaped wedge with the same slope of the steps mounted on the guide. The spring clamp is made in the shape of wedge with the reciprocal step-shaped slope. EFFECT: simpler construction. 2 dwg
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