Abstract: 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 means at opposite ends of the rail respectively limit movement of the trolley to the closed and fully open positions. Each stop means includes a compression spring which absorbs shock forces when the door is displaced to its extreme positions. The spring means also provide a force for displacing the door from its closed or fully open positions upon release of the means locking the door in either of these positions.

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.