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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 |
| 6585303 | Door locking and operating mechanism A door locking mechanism for deadlocking a door. The door locking mechanism includes a lockhead member which includes a door stopping portion. The lockhead member is moveable from a locked position, wherein the door is double deadlocked, and an unlocked p... | 07/01/2003 |
| 6581333 | Frame mounting for prison door lock and method employing same A frame for an electromechanical prison door lock. The frame includes multiple arrays of indicia that indicate which apertures match the locations of mounting holes in at least two locks each having a different mounting configuration. A cutout formed in a... | 06/24/2003 |
| 6182402 | Confinement-cell window attachment An apparatus for the viewing of an inmate in a cell while preventing the inmate from determining if he is being observed includes a frame enclosure with means for securing the apparatus about a cell window attached to the frame structure. A two-way mirror... | 02/06/2001 |
| 5864986 | Checking device for roller supported doors A check mechanism is provided to regulate door speed of a roller supported sliding door as the door is manually opened or closed. The mechanism is attached to a door hanger and uses a rocker arm, which slides along a control track. The control track has e... | 02/02/1999 |
| 5857290 | Checking device for roller supported doors A check mechanism is provided to regulate door speed of a roller supported sliding door as the door is manually opened or closed. The check mechanism includes an idler arm assembly attached to a door hanger with an idler roller attached to the idler arm a... | 01/12/1999 |
| 5641215 | Multi-cabinet assembly A multi-cabinet assembly comprises single cabinets which are arranged next to one another. The single cabinets include at least one master cabinet and one slave cabinet. All of the cabinets have a door. The multi-cabinet assembly further comprises an inte... | 06/24/1997 |
| 4912878 | Combined displacing and cushioning means for detention cell doors A mounting assembly is provided for a jail cell door. The door is suspended from a trolley and is slidable, on a fixed rail, between fully open and closed positions. Means are provided for releasably locking the door in either of those positions. Stop mea... | 04/03/1990 |
| 4621451 | Actuating and locking mechanism for sliding door An actuation and locking mechanism for sliding prison doors or the like includes a pivotal motor assembly, a movable carriage assembly reciprocally driven by the motor assembly and carrying the door, a drop bar assembly for locking or unlocking the carria... | 11/11/1986 |
| 4562664 | Door position monitor with automatic adjustment There is disclosed a door position monitoring assembly for a security door installation wherein the assembly can be adjusted and preset from the exterior of the assembly. In this regard, the monitoring assembly includes a base member with switching means ... | 01/07/1986 |
| 3961447 | Prison door locking mechanism A prison door locking mechanism particularly suitable for use with each of a pair of sliding prison doors laterally movable into stacking or overlapping position. The door locking mechanism includes a novel pivotally mounted locking dog having a latch eng... | 06/08/1976 |