Abstract: A security device for an internal combustion engine comprising a valve for installation in either the air inlet, fuel inlet or exhaust outlet of the engine, and a lockable valve control mechanism. When installed, the valve is operable from within the cabin of the vehicle by means of the valve control mechanism to open or close the valve. The valve control mechanism can be locked with the valve in the closed position so that when a thief attempts to start a car in which the device is installed, the engine won't start or if it does it won't run for long.

Abstract: Apparatus is provided to evacuate an air-tight openable and closeable container to a sub-atmospheric pressure. A flexible diaphragm inside the container responds to a change in pressure to actuate an alarm. In one embodiment, a display case is evacuated via a one-way valve by connecting a pump thereto. In a different embodiment, a pump inside a hand-carried case evacuates the case via a one-way valve. Alternatively, at least one side of the case is flexible enough to evacuate the case by pushing thereon, with no pump being required.

Abstract: Security apparatus which is operable to protect valuables by triggering an alarm and/or by defacing or rendering the valuables unusable on a change of pressure in a pressure sealable chamber. In a first embodiment suitable for use as a cash box (10), the valuables are received in a hollow receptacle (21) surrounded by a vacuum chamber (22) and a dye bomb (39) within the receptacle (21) is exploded on loss of vacuum within the vacuum chamber (22). In a second embodiment suitable for protecting the contents of mail bags, a hollow plug structure (63) is fitted to the nekc of a mail bag. The plug structure (63) has an opening (65) communicating with the interior of the mail bag so that the interior of the plug structure (63) and the interior of the mail bag can be evacuated to form a vacuum chamber. The plug structure (63) carries a dye container (69) from which dye is sprayed into the mail bag on loss of vacuum within the chamber.

Abstract: Wall of timber logs is built by fastening log ends to vertical steel studs. Log ends are notched at inner side of wall to present flat notch faces to flanges of studs. Stud flanges are pre-drilled with vertically spaced holes and fasteners are extended through selected holes into log ends. Weather seals are formed between the logs and extruded plastic strip for this purpose is also disclosed.

Abstract: Door locking apparatus including electrically operated lock mounted in door surround structure and electrically operable to thrust lock bolt into recess in door. Door carries lock over-ride mechanism manually operable from one side of the door to push lock bolt from recess in event of power failure to allow emergency exit. Over-ride mechanism may be interconnected with conventional latch mechanism on door such that latch is operable from both sides of doors to control entry and exit when electrically operated lock is switched off during periods when security not necessary.