Simplex keyless locks in .NET framework

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Simplex keyless locks
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Keyless entry locks provide exceptional security in a variety of modes. Motels, hotels, various private and government institutions are using these locks with increasing success (Fig. 18.10). The main manufacturer and proponent of key-
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Figure 18.10 Simplex
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5 pushbutton deadbolt lock. (Simplex Access Controls Corp.)
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less locking devices is Simplex Security systems. Their locks are commonly used in a variety of security-related situations where more than one entrance control device is required. As an example, consider the case of a company research and development facility. For added security, a keyless lock is added to each door. At night, then, two locks secure the door. During the day, the main lock is in the unlocked position, but the pushbutton lock is readily available for the use of the research and development employees because they are the only individuals who know the particular combination to gain access. In motels and hotels, the use of keyless locks has increased security, cut costs, and saved time and manpower. How By using the Simplex lock, in one example, one motel stopped losing more than 50 keys a month and saved the costs of continually having duplicate keys made and locks rekeyed. Best of all, thefts were almost entirely eliminated. Time and manpower were also saved with the installation of the Simplex lock. The desk clerk no longer had to hunt a duplicate key or go to a room and unlock it because the key was locked inside. The clerk simply gives the specific room combination, just as she did when the guest checked into the motel. Once the guest checks out, it requires only 3 minutes to change the combination; this keeps room security integrity very high. The Simplex lock is extremely easy to operate and maintain, despite its very high security. The lock has five pushbuttons arranged in a circle and numbered from 1 to 5. The combinations can be set at random; to operate the lock, the various buttons are pushed in sequence, in unison, or a combination of both. Installation of the lock is also relatively easy. The only tools required are a screwdriver, an electric drill, and a hole-saw set.
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Advantages. Before we get into the various installation procedures, let s look at the specific advantage of a Simplex lock so you will understand, as a locksmith, why many businesses and homeowners are installing these locks.
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No keys are required. For businesses, this means none are issued or controlled and there are none to recover when the employee leaves. They are burglarproof because there is no keyhole to pick. There are thousands of possible combinations. You can change the combination in seconds whenever there is a change in personnel or tenants or for other reasons of security. Money is saved because there are no keys or cylinders to be changed or replaced. The locking units are extremely durable. They are wear-tested for the equivalent of 30 years of intensive use. It is an extremely easy-to-install lock, more so than any other existing lock or knob type lockset. It is completely mechanical and requires no electrical wiring or specialized accompanying equipment.
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Varieties. The pushbutton combination lock (Fig. 18.11) comes in several models: the deadlock with a full 1-inch deadbolt, the automatic spring latch, the key bypass, and the special security model (for use with Department of Defense or industrial complexes requiring the security necessary for the protection of closed or restricted areas). The deadlock, model DL, requires only the combination pressed in the right order and the turn knob moved to open the lock from the outside. The lock remains in the open position, with the bolt retracted, until either the inside lever or outside knob is turned to throw the bolt into the locked position. The automatic spring latch, model NL, locks automatically. It opens with a finger lever from the inside. A thumb slide on the inside holds the retracted latchbolt in the unlocked position, if desired (Fig. 18.12). A variation, model NL-A, lacks the latch holdback. A deadlocking latch is standard for these units; this prevents prying the latch back on the closed door. The latchbolt is reversible without affecting the deadlatching function. The key bypass models (Fig. 18.13), DL-M and NL-M, are the DL and NL models with an optional key cylinder. They provide the flexibility of a master key system and the security advantages of a combination lock. Employees, tenants, and others use the combination. The key ensures entry regardless of the combination setting used but is given only to designated management personnel. This eliminates the need to maintain a central listing of combinations for reference use by top management personnel. It is completely safe because there is no widespread proliferation of keys and key distribution can be severely restricted.
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