Abstract: An activator assembly for an automatic sprinkler head having a fluid flow control valve comprising releasable lever means serving to hold the valve closed, and a control assembly including a fusible element, heat conductive fin means and a retaining ring all mounted upon an axial post, the lever means abutting the retaining ring and being released by axial displacement of the retaining ring when the fusible element responds to a predetermined temperature.

Abstract: Security lock assembly includes a movable lock bolt adapted for mounting to a door, and a striker unit adapted for mounting to a door jamb, which unit defines a bolt cavity. Latch means is mounted for movement to an operative position protruding into the cavity in which the latch means is engagable with the bolt to prevent its withdrawal from the cavity. Drive means drives the latch means to its operative position. A magnetized element in the bolt causes a magnetically operable switch mounted on the striker unit adjacent the bolt cavity to activate the drive means on the receipt of the lock bolt in the cavity.

Abstract: A valve for sealing closed the fluid supply orifice in a sprinkler head body, comprising a sealing plug having a projection extending axially towards the supply orifice when assembled on the body, a resilient membrane having an annular portion captured over the projection and for compression between the plug and the body to seal the supply orifice, and a tail portion attachable to the body, whereby upon jettisoning of the plug with opening of the supply orifice the plug remains attached to the body by the tail portion at least until the plug is clear of the fluid jet issuing from the orifice.

Abstract: A combination lock monitoring system for recognizing and indicating electronically the condition of operation of the lock, the recognition being achieved by photo sensitive means responding to the light reflecting quality of areas on the lock bolt mechanism, the lock drop arm and a combination wheel of the combination lock, the electronic circuit responding through a binary code to the condition of the photo sensitive means, and the indication including a visual display.