David A Dixon

US Patent:

47651636, Aug 23, 1988

Filed:

Apr 20, 1987

Appl. No.:

7/040194

Inventors:

Jeffrey G. Trull - Matthews NC
David Dixon - Monroe NC

Assignee:

Yale Security Inc. - Monroe NC

International Classification:

E05B 1310

US Classification:

70224

Abstract:

The front half of the knob shell and the cylinder are removable from the rest of the lockset without special skill or tools so that cylinder may be replaced or rekeyed. A radial retainer pin in the cylinder assembly extends outward into the lockset shank to hold the cylinder in place. When key is turned counterclockwise, the retainer pin may be depressed inward into a radial recess in the cylinder plug so that cylinder and knob front can be removed from the lockset. A recess in the plug has a spring-biased cover and forces the retainer pin back outward when the pin is released.

US Patent:

49764802, Dec 11, 1990

Filed:

Apr 5, 1990

Appl. No.:

7/505188

Inventors:

David Dixon - Monroe NC
Walter E. Surko - Southington CT

Assignee:

Yale Security Inc. - Monroe NC

International Classification:

E05B 300

US Classification:

292353

Abstract:

This lockset has a threaded inside sleeve extending out from its central housing, the sleeve enclosing the inside spindle for the lockset. An inside rose and handle assembly is provided, the rose having inward tabs. A nut is threaded onto the sleeve and has spaced openings about its end remote from the housing, the openings each leading to a series of steps in clockwise direction progressively closer to the housing. Each step has a tread and a riser so that when the handle is brought over the spindle and the rose is maneuvered so that the tabs fit into the openings and the rose is turned in a clockwise direction, the tabs will engage the closest riser to the housing that the thickness of the door will permit. Further clockwise turning of the rose will turn the nut and move the nut closer to the housing so that the treads engage the tabs and draw the rose/handle assembly inward to firmly and quickly install the lockset on the door.

US Patent:

44048254, Sep 20, 1983

Filed:

May 12, 1981

Appl. No.:

6/263036

Inventors:

David Dixon - Monroe NC
William A. Krupicka - Charlotte NC

Assignee:

Scovill Inc. - Waterbury CT

International Classification:

E05B 906

US Classification:

70368

Abstract:

A stop disposed in the bottom of the shackle heel bore normally blocks movement of a pin holding the cylinder in the casing. Raising the stop when the lock is unlocked permits the pin to move away from the cylinder freeing the cylinder for replacement.