Hierarchical cylinder lock systems

A key and a cylinder lock system comprising

• a first cylinder lock comprising:
• a rotatable cylinder with an axis and a keyway,
• an axially-elongated sidebar that is generally parallel to the longitudinal axis of the cylinder and is moveable between a first position blocking rotation of the cylinder and a second position allowing rotation of the cylinder,
• rotatable, reciprocating tumblers adapted to control rotation of the cylinder, wherein at least one tumbler is adapted to prevent movement of the sidebar from the first position to the second position unless the tumbler is rotated to a non-interfering orientation with respect to the sidebar, and
• a slider for controlling movement of the sidebar from the first position to the second position, a projection on the slider extending into the keyway;
• a second cylinder lock comprising:
• a rotatable cylinder with an axis and a keyway,
• an axially-elongated sidebar that is generally parallel to the longitudinal axis of the cylinder and is moveable between a first position blocking rotation of the cylinder and a second position allowing rotation of the cylinder,
• reciprocating tumblers adapted to control rotation of the cylinder without requiring that any of the tumblers rotate, and
• a slider for controlling movement of the sidebar from the first position to the second position, a projection on the slider extending into the keyway;
• a first key comprising:
• a key blade with a profile complementary to the configuration of the profile of the keyways of the first and second cylinder locks;
• bitting formed on the key blade and adapted to (1) elevate and rotate the tumblers of the first cylinder lock to elevations and orientations which (a) allow the cylinder of the first cylinder lock to rotate and (b) unblock movement of the sidebar of the first cylinder lock from the first position to the second position and (2) elevate the tumblers of the second cylinder lock to elevations which allow the cylinder of the second cylinder lock to rotate;
• at least one rib on the key;
• and
• a contact surface on the rib for cooperating with the projections of the first and second cylinder locks and moving the slider parallel to the axis of the cylinder to unblock movement of the sidebar of the first and second cylinder locks from the first position to the second position;
• and
• a second key comprising:
• a key blade with a profile complementary to the configuration of the profile of the keyways of the first and second cylinder locks;
• bitting formed on the key blade and adapted to elevate the tumblers of the second cylinder lock to elevations which allow the cylinder of the second cylinder lock to rotate;
• at least one rib on the key;
• and
• a contact surface on the rib for cooperating with the projection of the second cylinder lock and moving the slider parallel to the axis of the cylinder to unblock movement of the sidebar of the second cylinder lock from the first position to the second position,
• wherein the second key is not adapted to rotate the tumblers of the first cylinder lock and is therefore unable to open the first cylinder lock.

A set of keys for opening one or more locks in a hierarchical lock system including a first cylinder lock having a rotatable cylinder with an axis and a keyway, a movable sidebar for controlling rotation of the cylinder, rotatable, reciprocating tumblers for controlling rotation of the cylinder and movement of the sidebar, and a slider adapted to be engaged by a key inserted into the keyway for controlling movement of the sidebar and a second cylinder lock having a rotatable cylinder with an axis and a keyway, a movable sidebar for controlling rotation of the cylinder, reciprocating tumblers for controlling rotation of the cylinder, and a slider adapted to be engaged by a key inserted into the keyway for controlling movement of the sidebar, the set of keys comprising:

• a first key comprising a key blade adapted to fit into the keyways of the first and second cylinder locks and including a bitting surface configured to (1) elevate the tumblers of the first cylinder lock to elevations which allow the cylinder of the first cylinder lock to rotate, (2) rotate the tumblers of the first cylinder lock to orientations which unblock the sidebar of the first cylinder lock, and (3) elevate the tumblers of the second cylinder lock to elevations which allow the cylinder of the second cylinder lock to rotate, the blade being further configured to engage the sliders of the first and second cylinder locks and move the slider parallel to the axis of the cylinder to unblock the sidebar of the first and second cylinder locks;
• and
• a second key comprising a key blade adapted to fit into the keyways of the first and second cylinder locks and including a bitting surface configured to elevate without rotating the tumblers of the second cylinder lock to elevations which allow the cylinder of the second cylinder lock to rotate, the blade being further configured to engage the slider of the second cylinder lock and move the slider parallel to the axis of the cylinder to unblock the sidebar of the second cylinder lock, wherein the bitting surface of the second key is not configured to rotate the tumblers of the first cylinder lock and is therefore unable to open the first cylinder lock.

A hierarchical lock system, comprising:

• A at least one lock having a first level of security, said first security level lock comprising:
• (1) a shell having a bore formed therein;
• (2) a cylindrical plug having an axis and an axially-extending keyway adapted to receive a conforming key, wherein the bore formed in said shell is adapted to receive the cylindrical plug;
• (3) a plurality of tumbler pin assemblies disposed within tumbler pin holes formed in said shell and said cylindrical plug and adapted to control rotation of the cylindrical plug with respect to said shell, each tumbler pin assembly being reciprocally moveable within an associated tumbler pin hole, wherein engagement of the tumbler pin assemblies by the bitting of a properly configured key inserted into the keyway will elevate the tumbler pin assemblies within their associated tumbler pin holes so as to permit the cylindrical plug to rotate with respect to said shell;
• (4) an axially-elongated sidebar that is generally parallel to the longitudinal axis of the cylindrical plug and having an outer end that is engageable with a sidebar groove formed in the wall of the bore formed in said shell, wherein engagement of the sidebar with the sidebar groove blocks rotation of the cylindrical plug with respect to the shell;
• and
• (5) a slider disposed with respect to the cylindrical plug and adapted to move axially relative to the cylindrical plug, when engaged by a properly configured key inserted into the keyway, from a first position to a second position, wherein radial movement of the sidebar is controlled only by the slider, such that with the slider in the first position, the slider interferes with the sidebar to block the sidebar from moving radially inwardly toward the axis of the cylindrical plug, and with the slider in the second position, the slider does not interfere with the sidebar, thereby permitting the sidebar to move radially toward the axis of the cylindrical plug so that the sidebar disengages from the sidebar groove and permits the cylindrical plug to rotate within the bore formed in the shell;
• wherein the first security level lock is unlocked when the tumbler pin assemblies are elevated so as to permit the cylindrical plug to rotate with respect to the shell and the slider is moved to its second position so as to permit the sidebar to move radially inwardly and disengage from the sidebar groove;
• and
• B at least one lock having a second level of security, said second security level lock comprising:
• (1) a shell having a bore formed therein;
• (2) a cylindrical plug having an axis and an axially-extending keyway, wherein the bore formed in said shell is adapted to receive the cylindrical plug;
• (3) a plurality of tumbler pin assemblies disposed within tumbler pin holes formed in said shell and said cylindrical plug and adapted to control rotation of the cylindrical plug within the bore formed in said shell, each tumbler pin assembly being reciprocally moveable within an associated tumbler pin hole, wherein engagement of the tumbler pin assemblies by the bitting of a properly configured key inserted into the keyway will elevate the tumbler pin assemblies within their associated tumbler pin holes so as to permit the cylindrical plug to rotate with respect to said shell, at least a portion of at least one tumbler pin assembly being rotatable within its tumbler pin hole and including a beveled point adapted to cause rotation when engaged by a properly beveled bitting of a key inserted into the keyway;
• (4) an axially-elongated sidebar that is generally parallel to the longitudinal axis of the cylindrical plug and having an outer end that is engageable with a sidebar groove formed in the wall of the bore formed in said shell, wherein engagement of the sidebar with the sidebar groove blocks rotation of the cylindrical plug within the bore formed in the shell, wherein at least one of the tumbler pin assemblies blocks movement of the sidebar unless the tumbler pin assembly is rotated to a correct position to thereby enable the sidebar to move radially toward the axis of the cylindrical plug so that the sidebar disengages from the sidebar groove and permits the cylindrical plug to rotate within the bore formed in the shell;
• and
• (5) a slider disposed with respect to the cylindrical plug and adapted to move axially relative to the cylindrical plug, when engaged by a properly configured key, from a first position to a second position, whereby in the first position, the slider interferes with the sidebar to block the sidebar from moving radially inwardly toward the axis of the cylindrical plug, and when the slider is in the second position, the slider does not interfere with the sidebar, thereby permitting the sidebar to move radially toward the axis of the cylindrical plug so that the sidebar disengages from the sidebar groove and permits the cylindrical plug to rotate within the bore formed in the shell;
• wherein the second security lock is unlocked when the tumbler pin assemblies are elevated so as to permit the cylindrical plug to rotate with respect to the shell, the tumbler pin assemblies are rotated to an orientation such that inward radial movement of the sidebar is not blocked by any tumbler assemblies and the slider is moved to its second position so as to permit the sidebar to move radially inwardly and disengage from the sidebar groove;
• wherein the elevations of the tumbler pin assemblies which permit the cylindrical plug to rotate with respect to the shell are the same for the first security level lock and the second security level lock.