barcode printing in vb.net Lever Tumbler Locks in .NET framework

Creation QR in .NET framework Lever Tumbler Locks

Lever Tumbler Locks
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23/16"
3/4" 3/8"
13/32"
Standard locker door punchings
7/32" 21/32"
23/16"
13/32"
Figure 5.14 Specifications
for series 6000/7000 snap-on installation lock. (Lock Corporation)
Five
Figure 5.15 An eight-torsion tum-
bler cylinder drawer lock. (Lock Corporation)
Figure 5.16 Sliding door and showcase locks. (Lock Corporation)
Figure 5.17 Grooved key push
lock for sliding doors and display/showcases. (Lock Corporation)
Lever Tumbler Locks
LCA MODEL #3300 At unlocked position
7/8" 3/32"
At locked position
Travel
15/32"
11/8"
15/32" 5/8"
3/4"
11/2"
Dia.
1/8"
3/8"
Dia.
1/16"
Dia.
Drilled & CTSK for #6 flat head screw
Figure 5.18 Technical dimensions for the sliding door pushbutton lock. (Lock Corporation)
Locked position
7/8"
LCA Model #3400 At unlocked position
3/32" 15/32"
Travel Turn key 90 to unlock
At locked position
11/8"
1/2"
3/4" 1/2"
7/8"
11/2" Strike plate Drilled and CTSK for #6 flat head screw
Figure 5.19 Technical dimensions for the push and turn showcase lock. (Lock Corporation)
Cutting keys
The lever tumbler lock key can be cut by hand or machine. To make the key, you must have the proper key blank. The three critical dimensions of the lever tumbler lock key are the thickness, length, and height. If the key blank is slightly higher or wider than the original, the blank should be filed down to the proper size. If it is thicker, select another blank. Filing down the thickness of the blank weakens it structurally.
Five
Figure 5.20 Typical flat key blanks used to make keys
for lever tumbler locks.
Figure 5.21 Look-alike key blanks for lever tumbler locks.
Figure 5.22 Lever tumbler lock key nomenclature.
Lay the keys (original and blank) side by side, then run your finger lightly across them. If the blank is thicker than the original, you will feel your finger catch as it passes from one to the other. When you insert the key into the keyway, it should not fit tightly or bind. The first cut is called the throat cut, which enables the key to turn within the keyway. To make a throat cut, insert the blank in the keyway and scribe each side of the blank where it comes in contact with the cover boss. Determine the point where the trunnion or pin of the lock turns. Draw a vertical line there to indicate the depth of the throat cut. Remove the key from the lock, place it in a
Lever Tumbler Locks
vise, and use a 4-inch warding file to cut alongside the vertical line to the proper depth. Cut on the side of the line toward the tip of the key. There is a small round window in the back of most lever tumbler lock cases. The window is positioned so you can see where the bolt pin meets the lever gates. By observing the lever action through the window, you can get a general idea of the proper cuts to make on a key blank. After the throat cut is filed, make the other cuts. 1. Smoke the blank, insert it in the keyway, and turn. Remove it. The lever locations are marked on the blank. 2. File the marks slightly, starting with the marks closest to the throat cut. 3. Insert the key and turn it. Notice (through the window) the height to which each lever comes up and the position of the pin in relation to the lever gates. The distance from each gate to the pin indicates the cut depth for each lever. File each key cut a little at a time, periodically inserting and turning the key to check the gate/pin relationship. Be sure to file thin cuts. Continue until you can insert the key and have the gate and pin line up exactly. If the key in the keyway binds, observe the levers. One or more may not be correctly aligned. If the pin is too high, you have cut too deeply; if the pin is too low, you have not cut deeply enough. It may be necessary to resmoke the blank and reinsert it. The point where the key binds hardest will be indicated by the shiniest spot on the key. Just a touch with the file will usually alleviate the problem. Ensure that each filed cut is directly under its own lever. At this point, you should correct any variations between the original key and the blank. The dimensions must be identical: the key height, thickness, and length. You need a vise for holding the two keys, a small C-clamp, a warding file, a candle, and pliers. Follow this procedure: 1. Hold the original key over a candle flame and smoke it thoroughly. 2. Allow a few minutes for the key to cool; clamp the original and the blank at the bows. Most locksmiths use a C-clamp for this initial alignment. 3. Once aligned, place the key and blank in a vise. If you wish, you can leave the C-clamp in position. 4. Use the warding file to make the tip cut first. File in even and steady strokes, bearing down in the forward or cutting stroke. Keep a careful eye on the original. Stop when the file just disturbs the blackening. 5. Once the tip cut is completed, move to the next cut. 6. Remove the keys from the vise and inspect the cuts. Each should be rectangular and flat.
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