A door lock includes a latch driving device having a thumb turn that can be switched between a locking position not permitting movement of a latch to an unlatching position when an outer handle is pivoted and an unlocking position permitting movement of the latch to unlatching position when the outer handle is pivoted. The thumb turn includes an actuator controlling a switch to a conductive state or a non-conductive state. When the thumb turn is in the locking position, the switch is in the conductive state, and a lighting element controlled by the switch generates light transmitting through the first lid. When the thumb turn is in the unlocking position, the switch is in the non-conductive state, and the lighting element does not generate light. Thus, the locking or unlocking state of the door lock can be identified by sight.

A handle is provided with a main unit base having an engaging pin, a door base having a rotating shaft, a knob portion, and a rotation stopper. The knob portion has an engaging groove. The engaging groove has an open end. At the door-locking position, the engaging groove and the engaging pin become engaged with each other, and at the door-unlocking position, the engagement is released. When the knob portion is located at the door-unlocking position, the rotation stopper positions the knob portion such that the engaging pin is located inside an extension range of the open end. The engaging groove has a pushing surface, which pushes the engaging pin at the time of the displacement of the knob portion.

A piezoelectric energy harvester system for collecting kinetic energy is provided, wherein the kinetic energy is converted into electrical energy, and wherein at least a portion of the converted electrical energy is utilized to operate a load. The system comprises an energy input portion and an energy harvesting portion. The energy input portion includes an input member configured to be actionable by an outside force. The energy harvesting portion includes a capture member, a sprocket portion, and a piezoelectric energy harvester. The capture member is adapted for receiving mechanical input from the input member. The sprocket portion is disposed for movement with the capture member. The sprocket portion includes at least one radially disposed sprocket actuator configured for making contact with and exciting the piezoelectric energy harvester. The piezoelectric energy harvester is excited by the contact to produce the kinetic energy.

Some embodiments of the invention include a locking mechanism for a sliding barn door. The locking mechanism, for example, may include a lock mechanism. The locking mechanism may include a base configured to couple with a sliding barn door; an external handle; a connecting rod having a proximal end and a distal end, the proximal end of the connecting rod coupled with the external handle; a latch mechanism coupled with the connecting rod; and a locking mechanism disposed within the external handle. The locking mechanism may be configured to lock the external handle from rotating relative to the base such that when the locking mechanism is in a locked configuration the external handle and the rod do not rotate relative to the base, and when the locking mechanism is in an unlocked configuration the external handle, rod, and locking mechanism rotate relative to the base.

Some embodiments may also include a locking mechanism for a barn door, the locking system comprising: a locking mechanism body; a lock chamber configured to slide into the locking mechanism body in a locked configuration, and configured to slide out of the locking mechanism body in a first direction in an unlocked configuration; and a locking pin coupled with the lock chamber, the locking pin configured to slide outward in a second direction opposite the first direction in the locked configuration, and configured to slide inward in the unlocked configuration.

A piezoelectric energy harvester system for collecting kinetic energy is provided, wherein the kinetic energy is converted into electrical energy, and wherein at least a portion of the converted electrical energy is utilized to operate a load. The system comprises an energy input portion and an energy harvesting portion. The energy input portion includes an input member configured to be actionable by an outside force. The energy harvesting portion includes a capture member, a sprocket portion, and a piezoelectric energy harvester. The capture member is adapted for receiving mechanical input from the input member. The sprocket portion is disposed for movement with the capture member. The sprocket portion includes at least one radially disposed sprocket actuator configured for making contact with and exciting the piezoelectric energy harvester. The piezoelectric energy harvester is excited by the contact to produce the kinetic energy.

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 is a single-piece unitary structure including a key-following leg and a sidebar-engaging leg. The sidebar-engaging leg includes at least one true gate and a plurality of false gates. 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.

An electronic ball lock is disclosed, including: a front ball lock body, where the front ball lock body includes a front fixed frame and a front sleeve rotatably arranged on the front fixed frame; a rear ball lock body; a connecting rod having one end connected with the rear ball lock body and the other end provided with a driving member extending into the front fixed frame; an electric clutch mechanism arranged in the front fixed frame and capable of driving the front sleeve to be coupled with or separated from the driving member; and an identification module arranged on the front ball lock body and electrically connected with the electric clutch mechanism.

A handle is provided with a main unit base having an engaging pin, a door base having a rotating shaft, a knob portion, and a rotation stopper. The knob portion has an engaging groove. The engaging groove has an open end. At the door-locking position, the engaging groove and the engaging pin become engaged with each other, and at the door-unlocking position, the engagement is released. When the knob portion is located at the door-unlocking position, the rotation stopper positions the knob portion such that the engaging pin is located inside an extension range of the open end. The engaging groove has a pushing surface, which pushes the engaging pin at the time of the displacement of the knob portion.

A plug assembly including a plug, a sidebar movably mounted on the plug, and a plurality 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 is a single-piece unitary structure including a key-following leg and a sidebar-engaging leg. The sidebar engaging leg includes at least one true, gate and a plurality of false gates. 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.