I. Structural components of a lock
(1) Introduction to the Escutcheon: The escutcheon is the main component of the lock assembly, encompassing all parts and creating a closed structure. Trademark holes, keyway holes, lock core holes, drip holes, latch holes, spring holes, and pin holes are drilled in the escutcheon, primarily for compatibility with corresponding parts.
(2) Introduction to Locking Bars: Locking bars are a key component of the locking mechanism. They feature a long, slender neck and a notched section that work in conjunction with the locking pins. The slender neck allows the locking bar to rotate freely under the control of the pins, while the notched section provides the passage for the locking bar when it is engaged. The tongue groove is a critical area for ensuring a secure lock; therefore, high precision is required.
(3) Introduction to the Lock Mechanism: The lock mechanism features two shims that work together to convert rotational motion into linear movement. The shims retract the bolt, allowing the lock to be opened. To enhance the lock's resistance to picking, the keyway is often designed in an S-shape or with other unique profiles.
(4) Tongue Mechanism Introduction: The tongue mechanism is the original locking mechanism that works in conjunction with the locking tongue. It requires both flexibility and sufficient strength. The tongue head and the locking tongue groove are designed to work together, with the inclined surface of the tongue head distributing the pressure on the locking tongue, and the flat surface of the tongue base preventing the upward movement of the locking tongue. The slots at the bottom of the tongue and the lock pin cooperate to complete the locking and unlocking function. The tongue also prevents the lock pin from rotating when the locking tongue is retracted under pressure from the locking tongue.
(5) Introduction to Anti-Picking Covers: Anti-picking covers primarily function to protect the locking mechanism. They are installed at the head of the lock cylinder and can close the keyway, preventing foreign objects from manipulating the locking mechanism and achieving the anti-picking effect. When the lock needs to be opened, insert the corresponding key into the keyhole, ensuring that the flat surface of the round button and the outer circumference of the lock cylinder are aligned, and the bottom surface of the flat button and the round button are aligned, at the outer circumference of the lock cylinder. Rotate the key clockwise, and the lock cylinder will rotate with the key (the rotation angle is controlled by the lock cylinder pin).
Two. Working principle of mortise locks
When the shackle is moved, the shackle extends outwards due to the pressure exerted by the shackle spring, and simultaneously moves the shackle on the lock to rotate counterclockwise. When the lock is in its original position, the shackle is locked by the lock. The key can then be used to unlock the lock. At this point, the entire return spring enters the center of the shackle, while some of the flat springs enter the shackle and some remain within the lock body, locking the shackle.
When the lock needs to be closed, place the strike plate against the door latch and apply pressure to the bottom of the lock, or use your hands to apply force simultaneously to both the top and bottom of the lock, forcing the strike plate to move towards the lock body. The strike plate overcomes the spring force and presses the latch inwards towards the lock body. once the strike plate is inside the lock, the latch extends outwards under the action of the spring, engaging the strike plate and achieving the locking purpose.