A pick-resistant lock assembly may include a housing having a cylindrical opening. The cylindrical opening may have a centerline. The housing may include a plurality of pin cavities intersecting the cylindrical opening. A plug may be rotatably mounted in the cylindrical opening. The plug may include a keyway and a plug axis. A slide bar pocket may be formed within the housing. The lock assembly may include a pin verification mechanism having a slide bar in the slide bar pocket. The pin verification mechanism may be concealed within the housing and may be inaccessible to an attacker inserting a hand tool through the keyway. Other examples may be described and claimed.

A lock including a set of tumblers preserving their position after contact with a key to permit blocking of the keyhole during the opening process.

An anti-theft structure composed of a lock core composed of a lock core seat, a lock core shell, a push plate provided in a slide groove of the lock core shell, lock plates and washers alternately superimposedly provided in the lock core shell, a limiting plate and a positioning plate disposed on the lock core shell and placed in the lock core seat together with the shell, a latch lever, a brake bolt plate provided in an accommodating groove of the lock core seat, a compression spring provided in a groove of the lock core seat and pushing against the brake bolt plate, a positioning baffle provided in an accommodating chamber of the lock core seat and located at a bottom of the lock core shell, and a retaining ring embedded in a ring groove of the lock core seat; and a key provided with a ring groove.

A plug assembly including a plug, a sidebar movably mounted on the plug, and a plurality of rack pins seated in the plug. The sidebar is biased to an outer position in which the sidebar extends beyond an outer surface of the plug. Each rack pin includes a key-following leg and a sidebar-engaging leg. The sidebar-engaging leg includes at least one true gate. When a true gate of each rack pin is aligned with the sidebar, the sidebar is free to move radially inward to an inner position.

A pin tumbler lock has a body in which is rotatably housed a core assembly that includes first and second core portions that are rotatable relative to each other, the first core portion being coupled to a moveable cam operatively connected to a locking element external to the lock, and the second core portion including a keyway, there being a shaft extending from the core assembly into the lock body, and a pin stack including a driver pin and a key pin within the shaft, the stack being positionable under bias to engage the first and second core portions against independent rotation, wherein the pin stack is positionable in the presence of an object other than a correct key in the keyway to cause disengagement of the first core portion from the second core portion. The first and second core portions may be coaxially aligned.

A key system of a lock having a high peaking difficulty when picking is tried by a picking tool, includes three or more rectangular holes formed between pin holes of an inner case to insert rectangular pins, where each of the rectangular pin includes a side bar insertion groove and a fake groove formed to be spaced apart from the side bar insertion groove at an interval to raise the degree of picking difficulty. A quadrangular pin is inserted into the rectangular hole located in the middle among the rectangular holes formed in the inner case to be inserted into the hole formed in an outer case. The side on which the quadrangular pin is located has an escape groove to accommodate the quadrangular pin.

A rekeyable lock cylinder with a cylinder body and a plug assembly. The lock cylinder includes a plurality of key followers and a corresponding plurality of racks disposed in the plug assembly. Disengaging the racks from the key followers allows rekeying of the lock cylinder.

A rekeyable lock cylinder with a cylinder body and a plug assembly. The lock cylinder includes a plurality of key followers and a corresponding plurality of racks disposed in the plug assembly. Disengaging the racks from the key followers allows rekeying of the lock cylinder.

The invention refers to a lock system consisting of a hub cap (1), with a decentralized hole (2) for key insertion (3), where the lid (1) has appropriately inclined levels of pin pressure (7) and a key (8). The lid (1) is rotatable and it pushes a roller (21) through the sloping pin pressure level (7) which is located on the upper side of the lid (19) which pushes down a cluster of springs (15), (18) from locking (16) and alignment (17) pins, in order for the latter to align, allowing the case (9) and the hub (10) to rotate. At the same time, the rotation of the lid (1) pushes the key (3) inside the hub (10) in order to engage the two gears (24), (30), which will allow, through a knob (28), the opening of the latch bolt (26).

A pick-resistant lock assembly is provided. The lock assembly includes a housing having a main bore and a chamber including a plurality of channels holding a corresponding plurality of pin stacks, a core having a keyway and having a plurality of core openings configured to align with the channels of the housing, and a sleeve configured to fit within the main bore. The pin stacks are each configured to provide a plurality of decoy shear lines in which rotation of the core and the sleeve together is limited by a blocking position and a true shear line which permits rotation of the core and the sleeve together for actuation of the lock assembly when the true shear line is provided in each pin stack of the plurality of pin stacks.