Movable or removable closures – With protective grille or safety guard – Removable
Patent
1984-08-13
1986-03-25
Downey, Kenneth
Movable or removable closures
With protective grille or safety guard
Removable
49464, E06B 368
Patent
active
045774382
ABSTRACT:
A security unit for a window opening in a building comprising an upper security panel in an upper portion of the window opening, and a lower security panel in the lower portion of the window opening. The lower panel is supported for sliding movement from its installed position in which its lower edge is received in a channel to an upper position to which the panel is withdrawn from the channel and may be removed so that the occupant may get out in an emergency. The lower panel is locked in the installed position by means comprising a pair of pins mounted on a track carried by the upper panel. The pins extend downward and terminate just above the upper edge of the lower panel to prevent it from moving upward away from its installed position far enough to withdraw from the channel. A pair of deep holes in the upper edge of the lower panel are capable of receiving the pins so that when the pins are aligned with the deep holes, the panel may be moved upwardly from the installed position far enough to clear the channel because the pins will enter the holes. There are also a plurality of relatively shallow holes along the upper edge of the lower panel which, however, are of insufficient depth to permit the panel to be raised far enough to clear the channel so that the panel cannot be unlocked and removed when the pins are aligned with the shallow holes. The relatively deep and relatively shallow holes are substantially indistinguishable to the touch so that it would be practically impossible for an intruder to discover the right combination of holes to open the unit. Once the lower panel has been removed, the upper panel may also be removed.
REFERENCES:
patent: 3160927 (1964-12-01), Busillo
patent: 3325237 (1967-06-01), Dirk et al.
patent: 3381416 (1968-05-01), DeTorres et al.
patent: 3745704 (1973-07-01), Covington
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