Patent ID: 9127480
Filing Date: 2015-09-08
Classification: E05B,Y10T

Abstract:
1. A key and lock cylinder combination comprising: a key including a bow and a blade extending from and connected to the bow, the blade defining a longitudinal axis along the length of the blade and defined by a first lateral side and a second lateral side opposite the first lateral side, the blade having pin engaging portions at a top of the blade, a first pin groove on the first lateral side extending in the direction of the longitudinal axis and defining a first pin surface, and a second pin groove on the first lateral side extending in the direction of the longitudinal axis and defining a second pin surface, at least a portion of one or both of the first pin surface and the second pin surface being planar, the first pin surface oriented to face the top of the blade and the second pin surface oriented to face a bottom of the blade such that the first pin surface and the second pin surface face in opposite directions, each of the first pin surface and the second pin surface having a first portion and a second portion; a housing including a wall defining a hollow portion, and a pin portion defining an outer pin chamber; an outer pin disposed in the outer pin chamber; a plug including a body rotatably housed within the hollow portion of the housing, the housing and the plug cooperating to define a shear line, the plug defining a key slot extending at least partially through the body in a longitudinal direction of the plug, the plug further defining an inner pin chamber disposed within the body and in communication with the key slot and selectively aligned with the outer pin chamber, and an auxiliary pin chamber in communication with the key slot; an inner pin disposed in the inner pin chamber and extending partially into the key slot such that the inner pin is engageable by the pin engaging portions; and an auxiliary pin disposed in the auxiliary pin chamber and in communication with the key slot, the auxiliary pin including a first projection defining a first engagement surface engageable by the first pin surface when the key is inserted into the key slot to move the auxiliary pin to a withdrawn position to allow rotation of the plug relative to the housing, and a second projection spaced apart from the first projection and defining a second engagement surface generally facing the first engagement surface and engageable by the second pin surface when the key is removed from the key slot to move the auxiliary pin to a projecting position in which the auxiliary pin projects from the plug and is engageable with the housing to prevent rotation of the plug relative to the housing, wherein each of the first portions has no elevation change and each of the second portions has a planar increase in elevation toward the bow when the longitudinal axis is horizontal such that the auxiliary pin is movable upward upon insertion of the key into the key slot, and movable downward upon removal of the key from the key slot.