Extension for mortise cylinder

A mortise cylinder extension comprising:

• an extension body;
• said extension body including a bore extending through said extension body;
• first and second coupling elements sized and shaped to simultaneously be located in said extension body bore and to rotate within said bore;
• first coupling means located on said first coupling element for coupling said first coupling element to one of a rotating element on a mortise cylinder or a further mortise cylinder extension;
• second coupling means located on said second coupling element for attaching one of a cam member or a further first coupling element to said second coupling element;
• and
• means for interconnecting said first and second coupling elements whereby rotation of said first coupling element is transferred to said second coupling element and to said one of said cam member or said further first coupling element attached thereto, said means for interconnecting said first and second coupling elements comprising an interconnecting tenon located on one of said first or second coupling elements and an interconnecting slot located in the other of said first or second coupling elements, said interconnecting tenon and said interconnecting slot sized and shaped whereby said interconnecting tenon fits into said interconnecting slot.

A method of adapting a mortise cylinder to accept an extension comprising:

• selecting a cylindrical mortise cylinder having a cam member attached to a rotating control element via a control element tenon;
• removing said cam member from its attachment site on said control element tenon of said rotating control element;
• attaching a first coupling element to said control element tenon on said rotating control element, said first coupling element formed as a cylindrical drum having front and rear faces and a cylindrical surface extending between said faces with a coupling slot in said front face, said first coupling element located on said mortise cylinder by positioning said coupling slot over said control element tenon;
• locating a drilling guide on said mortise cylinder bearing said first coupling element attached thereto, said drilling guide formed of a drilling body having a first cylindrical chamber and a second cylindrical chamber formed axially therein with the axis of rotation of said second cylindrical chamber located with respect to the axis of rotation of said first cylindrical chamber in a relationship which mimics the relationship of the axis of rotation of said rotating control element with respect to the axis of rotation of said cylindrical mortise cylinder and with said second cylindrical chamber intersecting said first cylindrical chamber and wherein said first cylindrical chamber is sized and shaped to fit over said mortise cylinder and said second cylindrical chamber is sized and shaped to fit over said first coupling element attached to said mortise cylinder and further said drilling body includes first and second elongated apertures extending axially with respect to said first and second cylindrical chambers;
• drilling first and second holes in said mortise cylinder utilizing said first and second elongated apertures as drilling guides;
• tapping said first and second holes in said mortise cylinder to form threads therein.

In combination with a mortise cylinder of the type having a cylindrical body, a control element rotatively mounted in the body and a cam member attaching means on the control element for attaching a cam member to the control element, a cylinder extension comprising:

• an extension body;
• means for fixedly connecting said extension body to said mortise cylinder body;
• said extension body including a circular bore extending through said extension body, said circular bore including a circumferentially extending step dividing said bore into first and second coaxial cylindrical chambers of different diameters;
• first and second coupling elements sized and shaped to simultaneously be located in said extension body bore and to rotate within said bore;
• first coupling means for coupling said first coupling element to said cam member attaching means to coupled said first coupling element to said mortise cylinder control element;
• a cam member;
• second coupling means located on said second coupling element for coupling said cam member to said second coupling element;
• and
• means for interconnecting said first and second coupling elements whereby when said cylinder extension is mounted on said mortise cylinder, rotation of said control element is transferred through said first coupling element to said second coupling element and to said cam member attached thereto.

A mortise cylinder extension comprising:

• an extension body;
• said extension body including a circular bore extending through said extension body, said bore including a circumferentially extending step dividing said bore into first and second coaxial cylindrical chambers of different diameters.
• first and second coupling elements sized and shaped to simultaneously be located in said extension body bore and to rotate within said bore;
• first coupling means located on said first coupling element for coupling said first coupling element to one of a rotating element on a mortise cylinder or a further mortise cylinder extension;
• second coupling means located on said second coupling element for attaching one of a cam member or a further first coupling element to said second coupling element;
• and
• means for interconnecting said first a nd second coupling elements whereby rotation of said first coupling element is transferred to said second coupling element and to said one of said cam member or said further first coupling element attached thereto.