A method of forming lock cylinder plug using metal injection molding includes injecting a material that has a metal component and a plastic component into a mold. The metal component of the material is at least partially steel. The method includes molding the material into a lock cylinder plug having a key way passage. The method includes debinding the lock cylinder plug and supporting a portion of the lock cylinder plug using at least one ceramic support before increasing the density of the lock cylinder plug by performing a sintering heating process. The method includes inspecting the lock cylinder by inserting a key way portion of a key way gauge into the key way passage of the lock cylinder plug. Inspecting also includes classifying the lock cylinder plug as acceptable, at least in part, if the key way portion of the key way gauge is insertable entirely within the key way passage.

Systems and methods for providing secure locks having redundant access channels are disclosed. In some embodiments of the invention, the smart lock has a hardware processor, a power source, a cylinder, a button that forms a rose knob, and a rose protector. The rose knob and rose protector protect and conceal the hardware processor, the power source, and the cylinder. The rose protector forms an annular groove that slidably interlocks with the rose knob. The rose knob has a plurality of redundant access channels for receiving authentication information. The redundant access channels may include a biometric scanner for receiving biometric information, a passcode keypad for entering a token, or a wireless transceiver for receiving a token from a mobile device and transmitting a response to the mobile device. When the user cannot open the lock through the first redundant access channel, the smart lock is configured to allow access through a second access channel.

A folding lock includes a lock body having a latching mechanism, a jointed bar hoop having a plurality of jointed bars pivotably connected to one another, and a closing bar. A first end of the jointed bar hoop is permanently fastened to the lock body. The closing bar forms a free second end of the jointed bar hoop. The closing bar can be latched to the lock body by the latching mechanism. The lock body includes an alarm device for outputting an alarm signal. The closing bar can selectively be latched to the lock body in a first closing position or in a second closing position, with the alarm device not being able to be activated when the closing bar adopts the first closing position and with the alarm device being able to be activated or being activated when the closing bar adopts the second closing position.

A bicycle security device and associated bicycle theft alert or security systems are described. In some embodiments, the security devices and systems are configured to deter theft or other unauthorized uses of a bicycle, such as an electric bicycle, by providing multiple points or mechanisms of protection for the bicycle. For example, a bicycle security device, or bike lock, can include a cable or tether component integrated with a shackle of a wheel lock mechanism, which enables a rider to secure his/her bicycle via two integrated mechanisms of deterrence or protection within the bike lock.

A cable lock including a lock body having a locking mechanism with a locked state and an unlocked state. A ceramic body cable includes a plurality of nested ceramic bodies and a cord, wherein each one of the plurality of ceramic bodies includes a center portion having an aperture. Each aperture of the plurality of nested ceramic bodies forms a channel through which the cord is positioned. Each of the ceramic bodies also includes a projection and a space such that the projection of one of the ceramic bodies overlaps the space of an adjacent ceramic body. A mesh sleeve is positioned on an exterior of the ceramic body cable and a shrunken heat shrinkable tube is positioned over the mesh sleeve. The combined ceramic body cable, mesh sleeve, and shrunken heat shrinkable tube are coupled to the lock body.

A disc tumbler lock assembly includes a lock cylinder inserted in a lock cylinder chamber of a lock housing, the lock cylinder being formed with a disc cavity and a lug groove; inner locking discs each having a first key hole with a first locking tooth therein, a side of each inner locking disc being formed with a first latch notch and a first lug located in the lug groove; outer locking discs each having an inner locking disc room and a second key hole with a second locking tooth therein, a side of each outer locking disc being formed with a second latch notch and a second lug located in the lug groove; the inner and outer locking discs being arranged in pairs, a corresponding one of the inner locking discs being disposed in the inner locking disc room of a corresponding one of the outer locking discs.

Systems and methods for providing secure locks having redundant access channels are disclosed. In some embodiments of the invention, the smart lock has a hardware processor, a power source, a cylinder, a button that forms a rose knob, and a rose protector. The rose knob and rose protector protect and conceal the hardware processor, the power source, and the cylinder. The rose protector forms an annular groove that slidably interlocks with the rose knob. The rose knob has a plurality of redundant access channels for receiving authentication information. The redundant access channels may include a biometric scanner for receiving biometric information, a passcode keypad for entering a token, or a wireless transceiver for receiving a token from a mobile device and transmitting a response to the mobile device. When the user cannot open the lock through the first redundant access channel, the smart lock is configured to allow access through a second access channel.

A theft deterrent device includes a locking portion and a housing portion. The locking portion includes a locking mechanism. The housing portion includes a housing portion wall. The housing portion wall comprises a first material and is configured to house a second material within the housing portion wall. The second material is made of a different material than the first material. The second material is selected such that a cutting tool will be hindered when trying to cut through the housing portion.

An electronic locking device including a cylinder and a plug located in the cylinder. Within the plug is a solenoid with a pair of shuttles which move in opposite directions. A control processor controls the solenoids activating the shuttles when connected to the correct key. Blocking elements for each shuttle are inserted through the cylinder and into annular channels in the plug. The blocking elements receive and allow linear movement of the shuttles but prevent their rotation within the annular channels. In a locked condition the shuttles are contained only partially within the annular channels thereby preventing rotation of the plug within the cylinder but in an unlocked condition the shuttles are contained within the annular channels thereby allowing rotation of the plug. The plug also includes a weakness defining a point at which it will break upon application of excessive force.

A folding lock includes a lock body having a latching mechanism, a jointed bar hoop having a plurality of jointed bars pivotably connected to one another, and a closing bar. A first end of the jointed bar hoop is permanently fastened to the lock body. The closing bar forms a free second end of the jointed bar hoop. The closing bar can be latched to the lock body by the latching mechanism. The lock body includes an alarm device for outputting an alarm signal. The closing bar can selectively be latched to the lock body in a first closing position or in a second closing position, with the alarm device not being able to be activated when the closing bar adopts the first closing position and with the alarm device being able to be activated or being activated when the closing bar adopts the second closing position.