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The strike plate protects the jamb against friction from the bolt and increases security in the case of a jamb made of a softer material (such as wood) than the strike plate. Some strike plates have their hole size and placement calculated so a spring-bolt extends into the hole, but an adjacent anti-retraction device remains depressed ...
The parts included in the typical US mortise lock installation are the lock body (the part installed inside the mortise cut-out in the door); the lock trim (which may be selected from any number of designs of doorknobs, levers, handle sets and pulls); a strike plate (or box keep), which lines and reinforces the cavity in the door jamb or frame ...
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A tie plate, baseplate or sole plate is a steel plate for centering and reinforcing the attachment point on the rail tracks between a flanged T rail and a railroad tie. The tie plate increases bearing area and holds the rail to correct gauge. It is fastened to wooden ties by means of spikes or bolts through holes in the plate.
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A new trend is a strike that is quickly field-installation reversible from fail safe to fail secure (and back again if needed). Some manufacturers require the opening of the solenoids, but others allow the reversing of the function within seconds (usually take less than 10 seconds) with only the movement of two external screws or a mechanical ...
Traditional smoke detectors are ionization smoke detectors which create an electric current between two metal plates, which sound an alarm when disrupted by smoke entering the chamber. Ionization smoke alarms can quickly detect the small amounts of particles produced by fast-flaming fires, such as cooking fires or those fueled by paper or ...
The development budget was first set at US$2.5 billion in 1986, increasing to a projected US$30 billion in 1988. [31] By 2008, US$27 billion had been spent and another US$27.2 billion was required for planned production numbers. [24] Between 2008 and 2011, the V-22's estimated lifetime cost grew by 61%, mostly for maintenance and support. [55]