| 摘要 |
This specification discloses a secure yet aesthetic window unit which has particular applicability to detention buildings such as prisons, jails, cell blocks, penitentiaries, asylums and similar building structures and which is, for all practical purposes, resistant to metal cutting devices. One of preferable embodiments of such a window unit comprises a first frame, a second frame having the same height and width dimensions as the first frame and being integral with the first frame, and glazing; said first frame and second frame each comprising two jambs, a sill, a head frame and at least one mullion dividing the window opening thus formed into horizontal sections of a width sufficient to prevent the passage therethrough of an adult person, being preferably not more than about 6 inches or preferably less than about 53/4 inches; said jambs, sill, head frame and each mullion being metal tubes; each mullion of the first frame being filled with concrete and each mullion of the second frame confining a rotatable steel bar therein.
|
