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For volume installations in large construction projects or numerous prefabricated doors, you should use the Preso-Matic round face, drive-in bolt, which installs in seconds and saves time. Three basic installation layouts are available, as shown in Fig. 18.50. Figure 18.51 is a quick summary of the various lock models. Figure 18.52 provides an exploded view of the lock and part identification.
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Electrically operated release latch strikes and locks are easily installed in place of standard units to provide remote controlled access for a door. These units are not new to business and industry and really shouldn t be that new to the locksmith but they are. Why Because, excepting a few instances in large cities or industrial regions, the average locksmith doesn t get involved with such units. Since it is electrical, the job is passed to an electrician. By doing so, the locksmith loses valuable business. This chapter discusses some electrically operated locks and release latch strikes, the circuitry behind the various types of units, where they can be installed, and the potential of such units. (For more information on electronic security see my book, The Complete Book of Electronic Security, published by McGraw-Hill.) Electric Release Latch Strikes Electrically actuated release latch strikes are more common than locks. These units normally can be reversed for either right- or left-hand doors. They operate on low voltage and the strikes fit a hollow jamb channel as shallow as 15 8 inches (13 4 inches for mortise latches) or they can be, if necessary, installed in wooden jambs. Electrical release strikes are gaining popularity among small and large businesses. They come in a variety of sizes (Fig. 19.1) to meet varying needs and requirements. There are many electrical strikes available on the market. While all of them meet minimum standards, prior to your purchase of them you should still consider the manufacturer and the purpose for which the units were developed. Since this is a rapidly growing area of access control (security), it is important that you receive the latest and best information available. To obtain the
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Copyright 2005 by Bill Phillips. Click here for terms of use.
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Nineteen
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Figure 19.1 Various types and sizes of electric release latch strikes. (Adams Rite Mfg. Co.)
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following information, I contacted Adams Rite, the manufacturer considered the nation s leader in the electrical release latch strike field. I am extremely grateful for Adams Rite s assistance. First and foremost in the field is Adams Rite, whose electrical strikes are architecturally sound and designed to add increased security features to areas requiring a certain amount of traffic control. When properly powered and installed, these electrical release strikes will provide a very long, maintenance-free life. The fact that electrical power is used for the operation of the strike in no way makes the unit an electrical appliance, as some people tend to think. With a few exceptions, the electrical circuitry unique to these units are designed to meet the needs of the strike, not the other way around. The hardware specifier (that s you) should select the strike and expect the electrician (which could be you) to supply the power at the point of installation. In a few cases an existing circuit can be used, so the strike is selected and installed to it. In selecting strikes, two areas of consideration must be followed: electrical and hardware.
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Electrical considerations
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First, determine the duty of the unit. Is operation to be intermittent or continuous If the door is normally locked and released only momentarily from time to time, it is intermittent. In some cases, the strike is activated (unlocked) for long periods, so duty is continuous. A more rare requirement is reverse action, in which the strike is locked only when its current is switched on.
Intermittent duty. For a normal intermittent application, the electrical strike will have to be 24 Vac. This alternating current call-out gives enough power
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