FIELD: construction.
SUBSTANCE: blocking device comprises body with spring-loaded metal stem and electric contacts connected to alarm system. Additionally device is equipped with serially connected metal rope and thread-like cord. End of metal rope is passed through guide tube installed in door leaf frame, and is fixed in spring-loaded stem. Stem spring is installed with the possibility of deformation with rope and cord. End of thread-like cord is fixed at the end of door leaf frame. Metal rope and thread-like cord in point of their connection are equipped with loop with size that exceeds diametre of guide tube. Thread-like cord is installed along the whole height of door leaf frame.
EFFECT: improved reliability of rooms blocking in case of burglaries.
3 cl, 1 dwg
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