A foldable card includes first and second sections, each defining a base and a layer of a blade of a key extending therefrom; and a hinge interface connecting the bases of the first and second sections, wherein the first section is configured to fold over the second section at the hinge interface so that a top surface of the first section is against a bottom surface of the second section and each of the layers of the blades align to form the blade of the key, and the first and second sections are configured to fold at the hinge interface into a storage position to form a collective flat surface.

A foldable card includes first and second sections, each defining a base and a layer of a blade of a key extending therefrom; and a hinge interface connecting the bases of the first and second sections, wherein the first section is configured to fold over the second section at the hinge interface so that a top surface of the first section is against a bottom surface of the second section and each of the layers of the blades align to form the blade of the key, and the first and second sections are configured to fold at the hinge interface into a storage position to form a collective flat surface.

A mechanical key includes a key pattern recessed in the mechanical key in a thickness direction and key segments separable in the thickness direction. At least one of the key segments includes a key pattern slit. The key pattern slit extends through the at least one of the key segments in the thickness direction and is shaped in conformance with the key pattern.

A key bearing meaningful composite indicia including a plurality of assembleable key bits is described, where correctly selecting the assembleable key bits and properly combining them on the shaft of the key renders said key configured to achieve mechanical actuation of a compatible tumbler lock tract.

A key bearing meaningful composite indicia including a plurality of assembleable key bits is described, where correctly selecting the assembleable key bits and properly combining them on the shaft of the key renders said key configured to achieve mechanical actuation of a compatible tumbler lock tract.

The present invention relates to a changeable combined mechanical key, belonging to the technical field of key structures of encryption locks. The changeable combined mechanical key includes a bracket detachably connected to an end of a key handle, and a protective cover detachably connected to the end of the key handle and a key-shaped component. The present invention achieves anti-theft and duplication-preventing purposes for a key, and has unique advantages in many important fields such as safety boxes, important military places, banks, household intelligent anti-theft locks, and any other fields that require secrecy security. Unlike an electronic key that is easy to cause a problem due to an electronic circuit device and software and so on, the present invention, which is irreplaceable and has changed a machining process of a traditional mechanical key, saves energy and reduces consumption, and has a broad application prospect.

The present invention relates to a changeable combined mechanical key, belonging to the technical field of key structures of encryption locks. The changeable combined mechanical key includes a bracket detachably connected to an end of a key handle, and a protective cover detachably connected to the end of the key handle and a key-shaped component. The present invention achieves anti-theft and duplication-preventing purposes for a key, and has unique advantages in many important fields such as safety boxes, important military places, banks, household intelligent anti-theft locks, and any other fields that require secrecy security. Unlike an electronic key that is easy to cause a problem due to an electronic circuit device and software and so on, the present invention, which is irreplaceable and has changed a machining process of a traditional mechanical key, saves energy and reduces consumption, and has a broad application prospect.

A disc tumbler lock having a code range angle, the disc tumbler lock including at least: at least one tumbler and a guard tumbler, the at least one tumbler and the guard tumbler defining a keyway aperture there through; wherein the at least one tumbler includes at least: a key engaging surface defining a key engaging zone, the key engaging zone having a first radius defining the major extent of the key engaging zone, and the key engaging zone having a second radius defining the minor extent of the key engaging zone; wherein the guard tumbler defines: a restrictive aperture comprising a restrictive width having a minimum dimension less than or equal to the sum of the first radius defining the major extent of the key engaging zone and the second radius of the minor extent defining the key engaging zone multiplied by the sine of one half of the following: the code range angle of the lock, minus the angular measure between a last code angle for the lock and a second to last code angle for the lock, minus the angular span of the key engaging surface.

Proposed is a group of inventions relating to locking mechanisms, containing keys which can be separated into parts and which have catches and a plurality of replaceable blades which fit a plurality of locks, the replaceable blades of the keys of all of said locks attach to the catches of one key part having a bow, thus reducing the weight and overall size of a bunch of keys, allowing a person to carry only one key part having a bow and a plurality of key blades pertaining to different locks, reducing the weight and size of a bunch of keys, and a lock having corresponding mating mechanisms, increasing the security of the locking mechanism. The drawing shows the position of two catches on a key shank, using the example of a key to a pin-tumbler mechanism.

Proposed is a group of inventions relating to locking mechanisms, containing keys which can be separated into parts and which have catches and a plurality of replaceable blades which fit a plurality of locks, the replaceable blades of the keys of all of said locks attach to the catches of one key part having a bow, thus reducing the weight and overall size of a bunch of keys, allowing a person to carry only one key part having a bow and a plurality of key blades pertaining to different locks, reducing the weight and size of a bunch of keys, and a lock having corresponding mating mechanisms, increasing the security of the locking mechanism. The drawing shows the position of two catches on a key shank, using the example of a key to a pin-tumbler mechanism.