Mortise lock

In an electrical mortise lock having a chute-type housing having a cover, said housing accommodating a lock means, said lock means having:

• a lock actuating means (5), comprising an electric motor and actuating means, said electric motor integral with said housing (1);
• a control rod assembly (4) movable longitudinally in said housing;
• at least two mutually spaced-apart lock means (2, 2′) capable of projecting from said housing when said lock is in a closed position;
• said rod assembly (4) directly connecting said spaced-apart lock means (2, 2′) together, integral with the housing, and sliding in the housing, guided thereon by means of said spaced apart lack means (2, 2′);
• transmission means (6, 6′) for effecting movement between said lock actuating means (5) and said rod assembly (4), said transmission means (6′) including a drive means (10) and a receptacle (11, 12, 12′);
• said drive means (10) and said receptacle (11, 12, 12′) for said transmission means (6′) being directly connected, respectively, to an output shaft (9′) of said motor and said rod assembly (4);
• said electric motor (5) controlling said rod assembly (4) both in an opening and closing direction through said transmission means (6, 6′);
• and
• auxiliary mechanical actuating means (7) adapted to directly control said rod assembly (4) in an opening direction without interfering with movement of said rod assembly (4), said rod assembly (4) being disengageable from the control of said auxiliary actuating means (7) when said latter is in a closed position, the improvement wherein:
• said housing (1) accommodates, in addition to said rod assembly (4), said lock actuating means (5) and said auxiliary mechanical actuating means (7);
• said lock actuating means (5) and said auxiliary mechanical actuating means (7) are separated from each other, in spaced-apart relationship in said housing (1) over a length of said rod assembly (4);
• and
• said transmission means is effective to permit disengagement between said electric motor (5) and said rod assembly (4) at least in the opening direction thereof, said transmission means comprising a drive pin (10) mounted at the outlet of a speed reducer (9), integral with the motor (5) and a notched belt (11), kept engaged with said drive pin (10) and held between two return pulleys (12, 12′) mounted so as to pivot on the rod assembly (4), an electromagnetic coupling (15) acting on at least one (12′) of the return pulleys to block said at least one return pulley in rotation, wherein this coupling can be disengaged in case of a power failure to release the pulley (12′) and thus make it possible to wind the notched belt (11) on said pulley (12′), at least in the direction corresponding to the winding direction required to enable the rod assembly (4) to be opened.