FIELD: construction.
SUBSTANCE: invention relates to construction industry, mainly to lattice design to be installed in widow openings. The window mechanism with, at least, one opening leaf is intended for protecting from unauthorised access and contains a lattice with open wide section and locking mechanism. The lattice is designed to fasten window from outside so that open wide section is situated opposite to the opening window leaf. The locking mechanism is represented with lugs, which are parallel to lattice plane. One lug is fixed to the open wide section of the lattice and intended for accommodating ladle-shape rod so that the curved part overlaps the upper part of lugs. The rod is realised with handle having Lp length derived from the condition: Lp>1.2(L+1.7D-2d), where L - distance from lug to window plane, D - lug opening diameter, d - rod diameter.
EFFECT: improvement of mechanism reliability.
4 cl, 6 dwg
