초록 ▼

A pin and tumbler type lock in which a slide element is disposed at that end of the cylinder opposite the end from which the key is inserted, the slide element cooperating with a pin in the barrel and having a projecting portion diametrically opposite to the pin with which it cooperates which, in th

A pin and tumbler type lock in which a slide element is disposed at that end of the cylinder opposite the end from which the key is inserted, the slide element cooperating with a pin in the barrel and having a projecting portion diametrically opposite to the pin with which it cooperates which, in the locked condition, engages in an opening of the barrel. The slide element has a configuration for cooperation with the leading end of a key so that insertion of the correct key causes disengagement of that portion of the slide extending into the opening in the barrel and additionally brings abutting portions of the slide element and the cooperating pin to a shear line between the cylinder and the barrel to free the lock. Additionally, at least one pin in the lock has an electrically conductive extension adapted, when the pin with which it is associated is raised beyond the shear line to complete a circuit to an alarm device. Additionally, a tumbler of the lock is of reduced cross-section in the region where it abuts a corresponding pin to render picking the lock more difficult.

대표청구항 ▼

A lock comprising a barrel, a rotatable cylinder disposed in the barrel, a plurality of tumbler members disposed along a key slot of the cylinder and cooperating with a corresponding plurality of pin elements in the barrel to free the cylinder for rotation upon the insertion of a correctly coded key

A lock comprising a barrel, a rotatable cylinder disposed in the barrel, a plurality of tumbler members disposed along a key slot of the cylinder and cooperating with a corresponding plurality of pin elements in the barrel to free the cylinder for rotation upon the insertion of a correctly coded key into said key slot, a U-shaped slide element mounted upon the cylinder for rotation therewith at an end thereof remote from that end from which a key is inserted, said slide element being mounted for sliding movement radially of the cylinder, a pin member disposed in the barrel adjacent the slide element, a Portion of said slide element cooperating with said pin member, an opening in said barrel diametrically opposite to said pin member, a further portion of said slide element being disposed in said opening in a locked condition of the lock, a recess in said slide element defined by the arms and bight of said U-shape for cooperation with an end region of a key, said recess opening from the slide element in a direction facing the entry of the key slot for receiving a key inserted through said key slot, said recess passing through said slide element in a direction normal to the axis of the barrel and having opposite surfaces which cooperate with opposite surfaces of a correctly coded key, whereby upon insertion of the correctly coded key fully into the key slot, abutting portions of said pin member and slide element are brought to a shear line between said barrel and cylinder and said further portion of said slide element is withdrawn from said opening to free the cylinder for rotation within said barrel.