Patent ID: 8181393

Claim:
A lock mechanism suitable for locking a first hinged leaf ( 1 ) of a double door or gate and comprising: a frame ( 9 ) arranged to be fixed within an upright tubular member ( 7 ) of the first leaf ( 1 ); a bolt member ( 10 ) movably mounted on said frame ( 9 ) between a projected and a retracted position, the bolt member ( 10 ) being arranged to project through one extremity of said tubular member ( 7 ) out of this tubular member ( 7 ); and operator means ( 26 , 28 / 39 , 29 ) connected by means of a bolt operating mechanism ( 11 ) to the bolt member ( 10 ) for moving it from its projected to its retracted position and vice versa, which bolt operating mechanism ( 11 ) comprises a gear train ( 20 , 21 , 22 ) providing an increased travel of the bolt member ( 10 ), wherein said operator means are part of a first subunit ( 6 ) which is arranged to be fixed on an outer face of said tubular member ( 7 ); and wherein said frame ( 9 ), said bolt member ( 10 ) and said bolt operating mechanism ( 11 ) are part of a second subunit ( 8 ) which is arranged to be fixed within said tubular member ( 7 ), the lock mechanism further comprising a rotary shaft ( 32 ) enabling to couple the bolt operating mechanism ( 11 ) to the operator means through a hole ( 33 ) in said tubular member ( 7 ), the rotary shaft ( 32 ) having a non-circular extremity ( 35 ) arranged to be removably inserted through said hole ( 33 ) in said tubular member ( 7 ) in a corresponding non-circular recess in the shaft of a first gearwheel ( 22 ) of said gear train so that the rotation axis of said rotary shaft ( 32 ) and the rotation axis of said first gearwheel ( 22 ) coincide and the operator means comprising a hinged lever ( 26 ) movable between a pushed in position and a pulled out position, the bolt member ( 10 ) moving from its projected to its retracted position when the lever ( 26 ) is moved from its pushed in to its pulled out position and vice versa.