Patent ID: 7841141

Claim:
In combination with two log constructional elements ( 2 ) ( 9 ) used in log wall construction, a cogging piece ( 1 ) for use in joining one of said log constructional elements to the other; the improvement comprising, said cogging piece having an end surface ( 8 ) and being adapted to be attached to an end of each log constructional element ( 2 ) ( 9 ) that faces a cogged joint, wherein the cogging piece ( 1 ) is provided with upper and lower lateral ( 4 at , 4 bt , 7 at , 7 bt ) surfaces formed on respective upper and lower axial projections that extend from respective upper and lower laterally inclined surfaces, said axial projections configured to abut an end surface of one of the log constructional elements in the installed position, said upper and lower axial ( 5 at , 5 bt , 6 at , 6 bt ) inclined surfaces extending between said axial projections, said lateral and axial surfaces taken in relation to the length axis of the log constructional elements, said cogging piece having an inclined projection extending laterally on each side of said end surface of the cogging piece, and which cogging piece is adapted to rest against corresponding axial and lateral surfaces respectively of a second cogging piece attached to an intersecting log constructional element, wherein increasing vertical force on the log wall results in an increased axial contraction of the cogged joints in the said wall.