Cylinder lock configured to be operated by a flat-bladed key
AssigneeAssa Abloy High Security Group Inc.
InventorsPeter H. Field, Glenn Hartman
Life of this patent
Estimating the term…
Abstract
A cylinder lock with a rotating tumbler pin, a sidebar, and a slider has a keyway with a ward projection into the center of the bitting area of a key blade received by the keyway. The tip of each rotating tumbler pin seats on the bitting surfaces remaining to the sides of this center ward of the key, and the tumbler pins that are engaged by the bitting on the side of the key blade do not seat on more than half of the width of the blade. Half the pin width is removed from each tumbler pin near the tip thereof. The key has a bitted section at which one or more bittings are formed and a non-bitted section bitting that is devoid of bitting. The bittings extend at a constant depth to an edge of the key blade.
Claims10
A lock comprising:
- a cylinder having a keyway extending in an axial direction and one or more tumbler holes formed therein and extending in radial directions to the keyway;
- one or more tumbler pins, each disposed in a corresponding one of the tumbler holes;
- a sidebar disposed in a sidebar cavity formed in the cylinder and moveable within the sidebar cavity in a radial direction between a first position and a second position, wherein in the first position, the sidebar extends outwardly from the sidebar cavity to engage a sidebar groove formed in a housing within which the cylinder is rotationally disposed so as to prevent the cylinder from rotating with respect to the housing, and in the second position, the sidebar is retracted into the sidebar cavity to disengage from the sidebar groove and permit the cylinder to rotate with respect to the housing;
- wherein each tumbler pin is configured to be moveable in a radial direction between a first position blocking movement of the sidebar from its first position to its second position and a second position permitting movement of the sidebar from its first position to its second position, and
- a slider disposed in a slider cavity formed in the cylinder and moveable within the slider cavity in an axial direction between a first position and a second position, wherein in the first position, the slider blocks movement of the sidebar from its first position to its second position, and in the second position, the slider does not block movement of the sidebar from its first position to its second position,
- wherein the keyway is configured and oriented with respect to the one or more tumbler pins and each corresponding tumbler hole so that the width of the keyway is generally perpendicular to the axes of the tumbler holes so that a key having bitting formed on a side thereof will engage each tumbler pin positioned within each corresponding tumbler hole to move each tumbler pin from its first position to its second position, and
- wherein a portion of the slider extends into the keyway so as to be engaged by a key inserted into the keyway to move the slider from its first position to its second position.
Dependencies are inferred from the claim text.