Title:
【発明の名称】高安全ピンタンブラロック
Document Type and Number:
Japanese Patent JPH02500377
Kind Code:
A
Abstract:
An improved, highly pick-resistant tumbler lock construction incorporates at least one of the rear face of the driver sleeve or the front face of the tumbler sleeve with a plurality of notches. Each notch surrounds a driver or tumbler axial bore so as to provide at the trough of the notch a false shear plane while the crest of the notch portion of the tumbler and driver sleeve forms a plane to fixedly support two relatively thin discs which form the true shear plane. The discs include annularly spaced bores corresponding to the tumbler and driver sleeve bores. Thus when attempting to pick the lock, and the driver and tumbler pins are at the notched false shear plane, the driver sleeve will not be able to turn because the pins will be caught in the lower part of the notch. Several of the driver pins and the tumbler pins are also provided with annular grooves which, in combination with the undercuts on the spindle and tumbler sleeve, accentuate the false feel effect in such a way that the false feel of the shear plane is provided at different inwardly extending positions of the pins, thereby making it extremely difficult to determine when a particular tumbler pin has been precisely positioned at the shear plane.
Inventors:
Johnson, Gale
Application Number:
JP50638388A
Publication Date:
February 08, 1990
Filing Date:
May 20, 1988
Export Citation:
Assignee:
Fort Rock Corporation
International Classes:
E05B27/08; (IPC1-7): E05B27/08
Attorney, Agent or Firm:
Mitsuteru Soga (4 outside)