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| Number | Title | Issue Date |
| 7143545 | Security bar with multiple internal rolling bars and electronic monitoring A security bar providing improved security from breach is obtained with the use of a plurality of free rolling inner bars. Illustratively, three inner rolling bars, arranged in a triangular relationship, are provided inside a cylindrically hollowed out outer bar, th... | 12/05/2006 |
| 7118141 | Apparatus and method for securing an exit device to a door A securing mechanism for coupling an exit device to a door. The securing mechanism comprises a bracket coupled to the exit device and a shaft having a first end and a second end and defining a longitudinal axis. The bracket defines a first aperture and a second aper... | 10/10/2006 |
| 5241787 | Cell door operating system A symmetrical cell door and operating system comprises a vertically shiftable locking bar mounted in a center column of a cell opening. A cell door is movable in either direction relative to the central column and has upwardly facing locking notches in a ... | 09/07/1993 |
| 4982528 | Prison cell locking and unlocking device A prison cell door locking device which responds to four locking modes of a prison cell locking system which uses a master bar assembly controllable from a central location to (1) release the locks of all cells, (2) lock all of the cells, (3) allow key op... | 01/08/1991 |
| 4872284 | Cell block security systems A security system for detention cells is described. Known means are provided or lock to unlock the doors of all cells in a cell block. In combination with these means the present invention provides improved means for selectively unlocking the doors for in... | 10/10/1989 |
| 4190985 | Door locking assembly A locking assembly suitable for a plurality of sliding doors is disclosed. The assembly includes, at each door, a vertical drop bar in the door jamb with catches for engaging and locking the door at preferably two locations when the bar is lowered and the... | 03/04/1980 |
