Patents by Inventor Roy C. Spain

Roy C. Spain has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Cylinder lock
    Patent number: RE30198
    Abstract: A cylinder lock with a key plug rotatably mounted in the cylinder shell is described. The key plug has a plurality of tumblers that are set by the V bits of a key inserted in the key plug. The key is cut at three different levels and cut at three different angles. Each tumbler in the key plug may be positioned by the properly bitted key reciprocally to clear the shear line and also positioned rotationally to allow the fence to be cammed out of engagement with the cylinder shell. The key plug may then be rotated.A side bar cylinder lock is also described with the same key cut at three different levels and cut at three different angles. The tumblers are positioned reciprocally and rotationally by the properly bitted key to allow the fence to be cammed out of engagement with the cylinder shell. The key plug may then be rotated.
    Type: Grant
    Filed: December 13, 1977
    Date of Patent: January 29, 1980
    Assignee: Mechanical Development Co., Inc.
    Inventors: Roy N. Oliver, Elvis C. Flora, Paul A. Powell, Roy C. Spain