Types of Locks and Keys in Visual Studio .NET

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Types of Locks and Keys
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things the grading tests measure include bolt strength, turning torque needed to retract the latch, how well the finish holds up against salt sprays and other corrosives, and how many times the lock can be operated before failure.
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The operational test examines the amount of torque needed to retract the latchbolt with and without a key. It s performed first by depressing the deadlatch plunger (if necessary), then slowly applying torque force to the outside knob of an unlocked lockset until the latch is fully retracted. For a key-in-knob to receive a grade, torque used may not exceed 9 lbf-in. For a lever lock to be graded, torque cannot exceed 28 lbf-in. (Key-in-knobs are then tested in the opposite direction.) The test is repeated for the inside knob or lever. The lock is then put in the locked position and the deadlatch plunger is again depressed (if applicable). Then the key is inserted into the keyway and is slowly rotated until the latch is fully retracted. Torque may not exceed 9 lbfin. The test is repeated in the opposite direction if the lockset is designed to allow such movement. If the inside knob or lever is key-operated, the test is also applied to the inside knob or lever.
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The strength test examines how much forcible turning force a lock in the locked position can withstand. To be graded, a lock must stay locked after the minimum force has been applied. For a Grade 1, a key-in-knob must hold up to 300 lbf-in.; a lever lock must withstand 450 lbf-in. For a Grade 2, a key-inknob must hold up to 150 lbf-in.; a lever lock must hold up to 225 lbf-in. A Grade 3 requires a key-in-knob to withstand at least 120 lbf-in. and a lever lock to withstand at least 180 lbf-in.
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The cycle test examines how many times the lock can be operated before failure. For a Grade 1, a lock must complete 800,000 cycles. For a Grade 2, a lock must complete 400,000 cycles. Grade 3 locks complete at least 200,000 cycles. Key Types There are six basic types of keys: bit, barrel, flat, corrugated, tubular lock, and cylinder. Although different types of keys have different parts, virtually all keys have a bow (rhymes with toe). The bow (or handle) is the part of the key that a person holds while inserting the key into a lock. Bows come in a variety of shapes and often have identifying information or advertising imprinted on them. Figure 3.15 shows some common types of keys. A bit (or skeleton) key is usually made of iron, brass, steel, or aluminum. Major parts of the key include the bow, shank, shoulder, post, and bit. Many
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Figure 3.15 Different types of keys have different parts.
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barrel keys look similar to bit keys, but barrel keys have a hollow shank and often don t have a shoulder. A flat key is flat on both sides. Most are made of steel or nickel silver. Such keys are used for operating lever tumbler locks. Corrugated keys look similar to flat keys. Both types usually have the same parts. However, corrugated keys have corrugations (ripples) along the length of their blades. Corrugated keys are most often used to operate warded padlocks. A tubular key has a short tubular blade with cuts (depressions) milled in a circle around the end of the blade. The key is used to operate tubular key locks. Parts of a tubular key include the bow, blade, tumbler cuts, and nib. The nib is a small protrusion at the tip. It shows the position the key must be at to enter and operate the lock. The most common type of key is the cylinder key. It s used for operating most pin tumbler and disc tumbler locks. Major parts of a cylinder key include the bow, shoulder (one or two), blade, keyway (or milling) grooves, and tip. The shoulders of a key are generally used as stops when cutting keys. When a cylinder key doesn t have a shoulder, its tip is used as the stop. The keyway grooves are millings along the length of the blade that allow the key to fit into a lock s keyway. Key Blank Identification It s as important for locksmiths to be able to identify keys and key blanks as it is for them to identify locks. A key blank is basically an uncut key. Before duplicating a key, a locksmith must find a matching blank.
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