David Park Sutherland

US Patent:

7797973, Sep 21, 2010

Filed:

Mar 12, 2008

Appl. No.:

12/046756

Inventors:

Peter H. Field - Salem VA, US
David P. Sutherland - Roanoke VA, US
Clyde T. Roberson - Salem VA, US

Assignee:

Medeco Security Locks, Inc. - Salem VA

International Classification:

E05B 27/04
E05B 27/08

US Classification:

70337, 70491, 70494, 70495, 70496

Abstract:

A hierarchical lock system includes a first cylinder lock having a cylindrical plug, rotatable, reciprocating tumbler pins, a slider disposed within the plug and a side bar that cooperates with the cylinder plug, the slider, and the tumbler pins to control rotation of the lock. A second cylindrical lock includes a cylindrical plug, reciprocating tumbler pins, a slider, and a side bar that cooperates with the cylindrical plug and the slider. A first key is configured to open both the first and second locks by elevating and rotating the tumbler pins, and moving the slider to an unlocked position with respect to the side bar. A second key is able to open only the second cylindrical locks by elevating but not rotating the tumbler pins and by moving the slider to an unlocked position with respect to the side bar.

US Patent:

8186194, May 29, 2012

Filed:

Mar 27, 2009

Appl. No.:

12/413139

Inventors:

Peter H. Field - Salem VA, US
David P. Sutherland - Roanoke VA, US
Glenn Hartman - Salem VA, US
Mark Benzie - Roanoke VA, US
Walt Dannhardt - Roanoke VA, US
Kevin Galliher - Roanoke VA, US
Dan Boadwine - Salem VA, US
Clyde T. Roberson - Salem VA, US

Assignee:

Medeco Security Locks, Inc. - Salem VA

International Classification:

E05B 27/00
E05B 29/00

US Classification:

70491, 70409, 70421, 70419, 70496, 70493, 70495

Abstract:

A tumbler pin lock includes an auxiliary locking mechanism including an auxiliary locking pin to provide enhance locking in addition to the locking provided by the tumbler pins so that the lock remains locked even if the tumblers are picked or bumped into their unlocked positions.