Patent ID: 8534343

Claim:
A security window comprising: a plurality of vertical rods vertically arranged in a window frame; a plurality of links for connecting the plurality of vertical rods, variably spaced between the vertical rods; a guide rod, coupled to at least part of the vertical rods and fixed to the window frame, for guiding the movement of the vertical rods; a hook operating member vertically movably installed in a first vertical rod of the vertical rods, located farthest from one side of the vertical rods, the hook operating member having a hook; a hook movement control member, installed within the first vertical rod, for being vertically moved according to the vertical movement of the hook operating member; and a hook receiving member fixed to a jamb of an operable window sash for forming a hollow space to which the hook enters, wherein a second vertical rod located farthest from the first vertical rod is fixed inside the window frame, and the guide rod forms a groove at a position close to one end portion thereof, where the hook movement control member enters the groove.