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Testing Methods of Drawer Locks, Padlocks and Door Locks

Source: Junying   Author: Junying   Posted: 2017-12-15 11:18:39   Hits: 5

The following testing methods are suitable for testing security degrees, firmness, flexibility and surface quality of iron or copper padlocks, pin tumbler drawer locks, pin tumbler door locks and bicycle locks.

A. Security degrees
Different key cuts
Definition: Different key cuts are made based on the number of pin holes and the length of pins.
Testing methods
Look up the booklet of key cuts, and check whether or not the key cut meets the requirement. Take a good look at the lock and check whether or not the number of pin holes and the length of the pin meet requirements of key cuts.

The reasonable arrangement of key cuts
Definition: Whether the key cut is arranged reasonably or not.
Key cuts should be arranged in groups, and key cuts with low security degrees should be excluded in the booklet of the key cut. Meanwhile, avoid the lock being opened by a different key cut as well as prevent the same key cut.
Testing methods 
Check whether or not the booklet conforms to the requirement of the definition. 
There should be a spot test for 50 keys and check them one by one based on the requirement.

The length difference of two pins
Definition: The length difference between any of two pins
Testing methods
Measure all the pins so as to obtain the length difference between any of two pins, or we can measure the length difference between any of two key cuts.
Test Tools
0~125mm vernier calipers with scale interval 0.02mm, 0~25mm outside micrometers with first grade accuracy (scale interval 0.01mm), 0~10mm fixtures and dial indicators with first grade accuracy (scale interval 0.01mm) are required.

Mutual opening rates
Definition: The percentage of times of opening the lock and times of trying to open the lock.
Testing methods
Take the specified samples in the test and a group of five people will test the sample for enough testing times. The total test time doesn't exceed 45 minutes.

Computing methods of mutual opening rates 
X=R/T(T-1)×100% 
X represents mutual opening rates; R represents times of opening the lock; T represents the number of samples.

Safe mechanisms
Definition: Locks should have mechanisms which can improve safety performance of locks.
Testing methods
a. Pull resistance testing: There should be anti-pull measures for locks, and improve anti-pull performance of locks.
b. Pick proof testing: The mechanism should not malfunction under the condition of the effective length of the lock. 
c. Sawing resistance testing: The lock washer sticks out to clamp the lock body. Use a new hacksaw blade to saw the edge of the lock washer, and the lock washer will not  be sawn easily.
d. Drilling resistance testing: Fix the cylinder on the bench drill, and use the high-speed steel drill to drill at the key position. The cylinder should not be penetrated.
e. Disassembling resistance testing: Lock the door, and the lock should not be disassembled normally.
f. Chain resistance testing: The bicycle won't be moved if the chain is not unlock. Meanwhile, the chain can bear the required static tensile force.

Concentricity of cylinder plugs
Definition: The curved part of the cylinder plug should be close to or beyond the  center line of the key slot.
Testing Methods
Use the standard feeler gauge whose thickness is 0.2mm to stuff the center line of the cylinder plug slot, and the center line should not be stuffed.

Pins of cylinders
Definition: When you shake the cylinder, there should not be the sound of pins 
Testing Methods
Shake the cylinder in the direction of pin holes after the key is pulled normally. There shouldn't be sounds of pins except for other noise.

The angle between inserting and removing the key
Definition: Turn the key at the position when you first insert the key after unlocking the lock. Measure the angle between the key position of inserting the key and removing the key. 
Testing Methods
Install the lock on the tester, and use the key to lock the lock. Turn the key to unlock the lock. When the key goes back to the inserting position and is still, measure the angle between the center line of the key and the position of removing the key.