Safety padlocks are the most commonly used locks in the modern world. Among them, marble safety padlocks hold a dominant position.
1. Straight-Opening Pin Tumbler Safety Padlock
(1) Lock Body
The lock body is the main housing where all components of the padlock are assembled. It contains various holes: trademark hole, shackle hole, cylinder hole, drain hole, closed shackle hole, marble hole, and pin hole. These holes are designed to fit corresponding parts.
(2) Locking Shackle
The shackle is one of the core parts of the locking mechanism. It must withstand a certain static force. The long leg of the shackle has a thin neck and a notch, forming a slot that fits with the shackle pin. The thin neck allows the shackle to rotate freely under the pin’s control, while the notch serves as the locking point when the padlock is closed. The precision of this slot is crucial to proper locking.
(3) Lock Cylinder
At the head of the lock cylinder, there are two claws. When the bolt moves inward, the cylinder’s rotation is converted into bolt movement. To improve pick resistance, the keyway is often designed in an S-shape or irregular shape.
(4) Bolt (Latch)
The bolt works in coordination with the shackle. The tongue of the bolt fits into the groove of the shackle. When the shackle is pressed down, the slanted surface helps absorb the force, while the flat bottom prevents the shackle from moving upward. The bolt’s groove engages with the lock cylinder to complete the unlocking function. When the bolt is compressed by the shackle, the lock cylinder does not rotate.
(5) Anti-Pull Cap
The anti-pull cap mainly connects to the bolt. It blocks the keyway, preventing foreign objects from pulling out the bolt and thereby resisting tampering.
When unlocking, the correct key is inserted into the keyhole. The bottom of the round pin aligns with the cylinder’s circumference, while the flat pin aligns with the marble pin at the cylinder’s edge, separating the cylinder from the lock body. Turning the key clockwise rotates the lock cylinder (within a limited angle set by the pin). The claws behind the cylinder push the bolt, which extends under spring force. As the key is turned counterclockwise back to position, the cylinder is blocked again, and the key can be removed. At this point, the driver pins re-enter the cylinder, locking it in place.
When closing the safety padlock, the shackle is pressed down into the lock body. Pressure from the bottom of the lock body or by hand forces the shackle inward. The shackle compresses the spring, pushing the bolt inward. Once the shackle fully enters the body, the bolt extends outward again under spring force, securing the shackle pin and completing the locking process.