Abstract: 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, thereby ensuring that no inner bar can be attacked simultaneously from opposing sides thereof. The inner bars may be surrounded with a ring of ball bearings to provide for their ability to roll freely in place with respect to the outer bar. Electronic monitoring of the security bar identifies attempts to breach the security bar.

Abstract: 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 operation of the locks at each individual cell, or (4) allow electric operation of the cell locks from the central location is provided. The device is fully assembled on a mounting plate which is provided with means for alignment with and securing onto the frame of a prison cell, and for connection to the cell door locking member. The assembled device contains mechanical and electrical components to operate the cell locks in all four modes. The device includes a master bar section which is permanently connectable into the master bar assembly, without further alignment, by long hollow channels of light weight metal.

Abstract: 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 individual cells in the cell block by either an electrical or a manual, "key" mode of operation. In all modes of operation the cell doors are locked when drop bars are in their lower positions and unlocked when the drop bars are raised to an elevated position. The selective unlocking means are characterized by latching means which prevent the drop bars from being raised. In the electrical mode, a motor driven cam disables the lever and raises the latching means and raises a given drop bar. In the "key" mode manually actuated means disable the latch means and raise the drop bar of a selected cell. The selective unlocking means are disclosed in combination with both sliding and pivotally mounted cell doors.

Abstract: A security system for a jail cell block is described. The individual cells are each provided by drop bar means which are shiftable between a position in which the cell door is locked and a position in which the door is released for opening movement. Deadlock means are provided to prevent movement of the drop bar means to the release position. A master control has a "Deadlock", a "Release" and an "Individual Cell" mode. In the "Deadlock" mode, additional means are provided to prevent movement of the drop bar means, of all cells, out of their locking positions. In the "Release" mode, the deadlock means of all cells are disabled and the drop bar means are displaced to their release positions.

Abstract: A jail door operating and locking mechanism is provided, comprising a sliding jail door mechanism, lockable by a vertical lock bar, and having a mechanism permitting selective manual operation of cell doors, as well as selective power operation of cell doors, from a remote location. A spring loaded index assembly is provided, enabling indexing of selected doors as well as release of cell door control to prison inmates and retrieval of control when desired, all from a remote location. A carriage lock regulator assembly is also provided, comprising a regulator gear rack, regulator gear, regulator lock bar and regulator lock plate, in combination, which allow for overtravel in door operation.