A method for mutually controlling and unlocking a dual plug in a lock includes: unlocking a code of a first plug first, the first plug restricting unlocking of a second plug, the second plug restricting rotating of the first plug before the code of the first plug is unlocked. after unlocking the code of the first plug, the first plug translating to a second position from a first position using a preset position difference, the first plug being unable to rotate during the translation; after moving the first plug to the second position, the first plug releasing a restriction on the second plug, the second plug still restricting the rotating of the first plug; and unlocking the code of the second plug, the first plug and the second plug being able to rotate synchronously so as to unlock the lock after unlocking the code of the second plug.

A locking system uses a lock housing, a lock cylinder for rotation in the lock housing, pins to control the lock cylinder being in unlocked or locked states relative to the lock housing, and a key to control the position of the pins. The system further includes a slider or lock bar within the lock housing. The slider moves relative to the lock cylinder and the lock housing between (i) a cylinder locking position blocking rotation of the lock cylinder relative to the lock housing so as to isolate the pins from the torque applied to the lock cylinder while allowing the pins to be displaced between the locked and unlocked positions thereof and (ii) a pin locking position of the slider in which the pins are resisted from movement relative to the lock housing and the lock cylinder while rotation of the lock cylinder is uninhibited by the slider.

A pick resistant lock assembly has two lock sections which can be opened in two stages separated by time using a single key. The first locked section is rotated slightly by the use of the key, whereupon the second locked member is released from being locked by the isolated stack of locking pin tumblers and is then also made connective to the first lock section by a gear connective to the lock housing such that the first lock section and second lock section can then be rotated together, but only if the selectively machined key had been used in the beginning, else further rotation of either member is prevented by the multiple stacks of locking pin tumblers that are common to both.

Locking systems allow for the unlocking and locking of, e.g., doors, containers, and enclosures. Lock cylinders are coded to specific keys, and often there is a desire to have a key be able to access a subset of lock cylinders. Keys are coded using bitting to gain access to specific lock cylinders. It is with respect to these and other general considerations that embodiments have been described.

A tumbler pin lock includes one or two auxiliary locking mechanisms including an auxiliary locking pin, and an auxiliary blocking component to provide enhance locking in addition to the locking provided by the tumbler pins so that the lock remains locked even if the tumblers are picked or bumped into their unlocked positions. A cylinder lock is provided with an auxiliary locking pin which projects into the keyway, which, with the proper key, is slid forward with a mobile device into an area in the lock housing where an auxiliary groove allows the cylinder plug to turn. The second locking component, which is approximately rectangular similarly has a post that is moved forward with the insertion of the proper key into an annular groove allowing the cylinder plug to turn.

A tamper resistant lock. A lock has a lock housing with housing indentation. A cylinder is rotatably housed within the housing. A locking pin is connected to the cylinder and is inserted into the housing indentation when the lock is in a locked position and the locking pin is clear of the housing indentation when the lock is in an unlocked position. An anti-tampering mechanism is positioned between the housing and the cylinder. The anti-tampering mechanism receives a user's key and also includes a relative motion hole. A key extension portion is rotatably inserted inside the anti-tampering mechanism body and includes a relative motion indentation. The key extension portion is keyed to the cylinder. A lock ball is inserted into the relative motion hole and the relative motion indention, thereby preventing relative motion between the anti-tampering mechanism body and the key extension portion. A flexible band is wrapped around the anti-tampering mechanism body and covers the lock ball and holds the lock ball in place in the relative motion hole and relative motion indentation. The flexibility of the flexible band is sufficient to permit the lock ball to leave the relative motion indentation while simultaneously retaining the lock ball in the relative motion hole if the anti-tampering mechanism body is rotated while the locking pin is inserted into the housing indentation, thereby permitting relative motion between the anti-tampering mechanism body and the key extension portion. In a preferred embodiment the tamper resistant lock is a padlock.

A method for mutually controlling and unlocking a dual plug in a lock includes: unlocking a code of a first plug first, the first plug restricting unlocking of a second plug, the second plug restricting rotating of the first plug before the code of the first plug is unlocked. after unlocking the code of the first plug, the first plug translating to a second position from a first position using a preset position difference, the first plug being unable to rotate during the translation; after moving the first plug to the second position, the first plug releasing a restriction on the second plug, the second plug still restricting the rotating of the first plug; and unlocking the code of the second plug, the first plug and the second plug being able to rotate synchronously so as to unlock the lock after unlocking the code of the second plug.

A cylinder locking device is provided in which an inner cylinder is pivotably inserted into a cylinder body, a protector is disposed opposite a rear end of the inner cylinder along an insertion direction of a mechanical key, the protector enabling the mechanical key to be inserted toward the inner cylinder, and a coil-shaped spring is provided between the protector and the inner cylinder or the cylinder body, wherein the spring is formed so as to have a coil portion that extends in the axial direction of the inner cylinder and a bent portion that is bent from at least one end part of the coil portion toward an interior of the coil portion in a direction along an axis of the inner cylinder. This enables deformation of a coil-shaped spring to be prevented.

An interchangeable lock core for use with a key and having a locked state and an unlocked state is disclosed. The lock core may include a shell, a plug, and a lock. The plug may be positioned within and rotatable relative to the shell between a first plug position and a second plug position about a longitudinal axis of the plug. The plug may include a keyway adapted to receive the key. The lock may be rotatable about a lock axis between a first wherein a rotation of the plug is restricted and a second position wherein the plug is rotatable from the first plug position to the second plug position. The lock axis may be positioned outside of an envelope of the plug.