Disc tumbler lock and key

A tumbler lock including, a lock body, a barrel assembly mounted in said lock body for relative movement about an axis of rotation, said barrel assembly including a plurality of disc tumblers, each of which is rotatable about said axis of rotation relative to each other, said disc tumblers including at least one standard disc tumbler and at least one dual function disc tumbler, and a side locking bar which is operative to prevent rotation of said barrel assembly relative to said lock body when said lock is in a locked condition, and which is inoperative to prevent said barrel assembly rotation when each said disc tumbler is in a service position of rotation relative to said lock body, and is also inoperative when the or each standard disc tumbler is in its respective said service position and the or each said dual function disc tumbler is in a second function position of rotation relative to said lock body, said barrel assembly being removable from said lock body by being moved axially through an end of said lock body, retention means being operative to prevent said removal, and said retention means being rendered inoperative to prevent said removal when the or each said dual function disc tumbler is in a said second function position, said retention means including at least one movable detent which is connected to said barrel assembly and is received in a detent release recess of said dual function disc tumbler when that disc tumbler is at said second function position so as to thereby render said movable detent inoperative to prevent said barrel assembly removal.

A tumbler lock including, a lock body, a barrel assembly mounted in said lock body for relative movement about an axis of rotation, said barrel assembly including a plurality of disc tumblers, each of which is rotatable about said axis of rotation relative to each other, said disc tumblers including at least one standard disc tumbler and at least one dual function disc tumbler, and a side locking bar which is operative to prevent rotation of said barrel assembly relative to said lock body when said lock is in a locked condition, and which is inoperative to prevent said barrel assembly rotation when each said disc tumbler is in a service position of rotation relative to said lock body, and is also inoperative when the or each standard disc tumbler is in its respective said service position and the or each said dual function disc tumbler is in a second function position of rotation relative to said lock body, said locking bar being maintained in said operative position by engagement with a peripheral surface of at least one said standard disc tumbler when that disc tumbler is in a position of rotation other than said service position, or by engagement with a peripheral surface of at least one said dual function disc tumbler when that tumbler is in a position other than either said service position or said second function position, at least one lock release recess is provided in said peripheral surface of each said disc tumbler, at least one barrel release recess is provided in said peripheral surface of the or each said dual function disc tumbler, each said lock release recess is adapted to receive said side locking bar and thereby permit said side locking bar to adopt said inoperative position when the respective said disc tumbler is in a said service position, and said barrel release recess is adapted to receive said side locking bar and thereby permit said side locking bar to adopt said inoperative position when the dual function disc tumbler is in said second function position, said barrel assembly being removable from said lock body by being moved axially through an end of said lock body, retention means being operative to prevent said removal, said retention means being rendered inoperative to prevent said removal when the or each said dual function disc tumbler is in a said second function position, said retention means including at least one movable detent which is connected to said barrel assembly and is received in a detent release recess of said dual function disc tumbler when that disc tumbler is at said second function position so as to thereby render said movable detent inoperative to prevent said barrel assembly removal.

A tumbler lock including, a lock body, a barrel assembly mounted in said lock body for relative movement about an axis of rotation, said barrel assembly including a plurality of disc tumblers, each of which is rotatable about said axis of rotation relative to each other, said disc tumblers including at least one standard disc tumbler and at least one dual function disc tumbler, and a side locking bar which is operative to prevent rotation of said barrel assembly relative to said lock body when said tumbler lock is in a locked condition, and which is inoperative to prevent said barrel assembly rotation when the or each standard disc tumbler is in a service position of rotation relative to said lock body, and is also inoperative when the or each standard disc tumbler is in its respective said service position and the or each said dual function disc tumbler is in a second function position of rotation relative to said lock body, said at least one dual function disc tumbler permitting release of said barrel assembly from said lock body when the or each standard disc tumbler is in said service position and said dual function disc tumbler is in said second function position, said locking bar being maintained in said operative position by engagement with a peripheral surface of at least one said standard disc tumbler when that disc tumbler is in a position of rotation other than said service position, or by engagement with a peripheral surface of at least one said dual function disc tumbler when that tumbler is in a position other than either said service position or said second function position, at least one lock release recess being provided in said peripheral surface of each said disc tumbler, at least one barrel release recess being provided in said peripheral surface of the or each said dual function disc tumbler, each said lock release recess being adapted to receive said side locking bar and thereby permit said side locking bar to adopt said inoperative position when the respective said disc tumbler is in a said service position, and said barrel release recess is adapted to receive said side locking bar and thereby permit said side locking bar to adopt said inoperative position when the dual function disc tumbler is in said second function position, said barrel assembly being removable from said lock body by being moved axially through an end of said body, retention means being operative to prevent said removal, and said retention means being rendered inoperative to prevent said removal when the or each said dual function disc tumbler is in said second function position, said retention means including at least one fixed detent which is connected to said barrel assembly and projects beyond a radially outer surface of said barrel assembly, a circumferential groove is formed in an inner surface of said lock body and slidably receives said fixed detent so as to thereby permit rotation of the barrel assembly relative to the lock body, a barrel release groove is formed in said inner surface of said lock body and extends generally in the direction of said axis of rotation, and said fixed detent being rendered inoperative to prevent said barrel assembly removal when said barrel assembly is at a barrel removal position of rotation relative to said lock body at which said fixed detent is aligned with said barrel release groove so as to be slidably receivable in that groove.