A tubular lock assembly has a tubular lock, a cover, and a disassembling unit. The tubular lock has an annular keyhole and a cover screw hole enclosed by the keyhole. The cover is detachably assembled with the tubular lock, and has a covering board segment, a screw rod segment, and a first fitting segment. The covering board segment covers the keyhole. The screw rod segment is detachably screwed in the cover screw hole of the tubular lock. The first fitting segment is formed on the covering board segment. The disassembling unit has a second fitting segment. The second fitting segment corresponds in shape and size with the first fitting segment of the cover, such that the second fitting segment is adapted to engage with the first fitting segment, and the disassembling unit is capable of rotating the cover.

A system may include a lock assembly having secured and unsecured conditions and having an opening for receiving a lock actuating object. An access restriction element may be positionable with respect to the lock assembly to affect access to the opening of the lock assembly. The access restriction element may have at least two conditions, a blocking condition in which the access restriction element at least partially obstructs access to the opening of the lock assembly and an access condition in which the access restriction element is configured to permit access to the opening of the lock assembly. The system may also include an access detection assembly configured to detect attempted access to the opening of the lock assembly by sensing changing of the access restriction element from the blocking condition to the access condition.

A security lock system for a fifth wheel hitch is system that restricts access to the connection between a fifth wheel hitch and a truck bed. The system includes a receiver lock, a fifth wheel hitch, a first sleeve, a second sleeve, a lock engagement channel, and a key. The receiver lock shields a securing mechanism of the fifth wheel hitch. The receiver lock connects with a base frame of the fifth wheel hitch through the lock engagement channel. The first sleeve and the second sleeve uphold the receiver lock against the lock engagement channel. A retractable locking bolt and a locking assembly are connected to each other with the key. The retractable locking bolt and the locking assembly remain stationary as the retractable locking bolt includes a first tubular body and a first stopper, and the locking assembly includes a second tubular body and a second stopper.

A lock device is provided. The lock device includes a housing with a front opening at an end; a rotating hook disposed in the housing and being rotatable relative to the housing, the rotating hook including a front-end portion and a rear-end portion, the front-end portion at least partially protruding from the front opening, and the rear-end portion extending toward a direction opposite to the front-end portion; a driving device disposed in the housing and selectively moveable to change widths by which the front-end portion is opened respectively; and a lock body disposed in the housing, when the lock body is locked, the lock body restricting a movement of the driving device.

A weather resistant tumbler lock has an elongated body, and defines a longitudinal axis. The lock is interchangeable with another lock having a corresponding asymmetrical perimeter profile with an opening in a top surface sealed with a cap, the other lock having a different rotatable core and a different configuration of tumblers. A drainway provides a channel for water to flow outwardly from the interior of a shell housing, a rotatable core and a keyway within the core, to a drain below the lock. The drain connects to a channel through a lower edge. The core provides an arcuate gap in a lower quadrant adjacent the interior surface of the shell for fluid communication with the drainway. A method includes identifying a substitute tumbler lock with an impermeable outer wall for replacing another lock having an identical outer perimeter profile and a permeable closed opening on its top surface.

A padlock configured to be locked and unlocked by a key includes a key-retaining cover. The padlock includes a lock body having an internal cavity with a locking mechanism received therein. The locking mechanism is a linear lock configured to receive the key through a keyhole to lock and unlock the padlock. A direction of insertion of the key into the locking mechanism is parallel with a direction of displacement of a plurality of tumblers in the locking mechanism thereby creating an outward ejection force on a fully-inserted key. The cover is disposed on the locking mechanism proximate the keyhole. The cover is configured to retain the key in position relative to the locking mechanism against the outward ejection force after the key is received in therein.

A lock assembly for a door includes a lock mechanism moveable between an extended position wherein the door is locked and a retracted position wherein the door is unlocked such that the door may be opened and closed. The lock assembly also includes first and second lock cylinders operably connected to the lock mechanism such that actuation thereof causes the lock mechanism to move to the retracted position, the lock cylinders each including a first keyhole. A tamper resistant member is moveable between a protected position in which the keyhole of the second cylinder is inaccessible and an unprotected position in which the keyhole of the second cylinder is accessible, such that a tool is required in order to move the tamper resistant member from the protected position to the unprotected position, the tool adapted to be stored separately from the door.

A tamper-resistant lock assembly comprising a plate having a slot for receiving a key, the slot extending through the plate from an opening in a front face thereof to an exit in an opposing rear face thereof, the opening having a first profile and the exit having a second, different profile, the key comprising a shaft having a bit extending therefrom, the bit being formed of a shape memory material and being pre-configured such that its cross-sectional shape in its temporary form matches the first profile and the bit can be inserted through the slot via the opening and, upon application of a predetermined external stimulus, returns to a permanent form in which its cross-sectional shape matches the second profile and the bit can be retracted from the slot via the exit.

A method for mutually controlling and unlocking a dual plug in a lock, comprising: 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. The present invention further relates to a lock with a dual plug.

A linearly-actuated lock including a housing, a lock case received within the housing along an axis, and a lock barrel rotatable relative to the lock case between a locked state and an unlocked state. The lock barrel includes tumblers and tumbler springs. The lock further includes a key insertable into the lock barrel to displace the tumblers relative to the lock barrel in a direction parallel to the axis and a sidebar extending through apertures of the lock barrel. The sidebar is engageable with a notch of the tumblers when the sidebar moves radially inward relative to the axis. The sidebar includes a cam surface slidable against at least one of the housing and the lock case when the lock barrel rotates. The sidebar also includes a projection having a single-ramped surface received within the notch of each tumbler when the lock barrel is in the unlocked state.