papped double dovetail joint

The butt joint with double dovetail combines the classical lap joint with the tensile-resistant properties of dovetail connections, thereby enabling multidirectional force absorption.
The butt joint with double dovetail belongs to the family of lap, butt, and dovetail connections. As an I-Joint, it demonstrates close kinship with the lapped dovetail joint. The connection unites the principles of lapping with the positive securing of dovetail geometries.
The connection is based on a classical lap joint in I-geometry along one axis, enhanced by additional dovetail connections in the upper and lower lap surfaces. The laps are extended through the dovetail formation, creating conical tenons at both ends of the lap joint that engage with corresponding dovetail recesses. This double dovetail securing provides positive anchoring in multiple directions.
The advantage lies in the ability to absorb forces in X- and Y-directions. While the classical lap joint primarily transfers compression forces, the dovetails additionally enable the absorption of tensile forces and transverse forces.
The connection requires craftsmanship precision, as both the lap joint geometry and the two dovetail formations must fit exactly.
The conical shape of the dovetails prevents separation of the connection and provides multidirectional positive locking.
The butt joint with double dovetail is used in sill connections in wall constructions, door and window frames, and in rails for wall and furniture constructions. The connection is particularly suitable for applications where complex force patterns must be securely transmitted.
Manufacturing follows traditional carpentry techniques with precise marking. After working the lap joint, the two dovetail formations are crafted at the ends. The positive-locking connection functions without additional timber connectors.
The connection can be executed in various proportions, with the size of the dovetails adapted to the lap length and expected loading.