Patent ID: 8448999

Claim:
A motor-driven lock ( 1 ) with a rotary bolt, comprising a bolt ( 2 ) rotary between at least one closed position (A), in which the bolt locks a closing anchor, and another open position (B), which releases the closing anchor, the bolt subject to forces by a spring in the release direction, and a latch ( 3 ) also rotary between a closed position, in which the latch retains the bolt in the locking position, and another releasing position, in which the latch releases the bolt, the latch being subjected to the action of a second spring thrusting the latch towards the closed position, the lock ( 1 ) furthermore comprising a motor-driven drive cam ( 4 ), which rotates about an axis ( 5 ), and a transmission means ( 6 ) suitable for moving the latch ( 3 ), from the closed position to its releasing position, the transmission means ( 6 ) comprise a rocker arm ( 7 ), configured to swing back and forth, between two end positions, provided with a peripheral extension ( 9 ) loosely coupled to the end of the latch ( 3 ), the rocker arm ( 7 ) comprising an aperture having a periphery that includes a control slide surface ( 10 ) extending in a curved shape about the axis ( 5 ) of rotation of the drive cam ( 4 ), with variable radii, the drive cam being located within the aperture, and a grip section ( 10 a ) with the drive cam ( 4 ) being determined, in which the movement of the drive cam ( 4 ) causes the swinging of the rocker arm ( 7 ) in a first direction and, by thrusting of the peripheral extension ( 9 ), the rotation of the latch ( 3 ) from the closed position to the releasing position, and hence that of the bolt to the open position; a no-load section ( 10 b ), in which the drive cam ( 4 ) loses contact and rotates without driving the rocker arm ( 7 ), the rocker arm being subject to the thrust received by the latch ( 3 ) which is driven by the second spring and is applied against the bolt ( 2 ); and a stop section ( 10 c ), in which resistance to the rotation of the drive cam ( 4 ) is offered which is suitable for generating a stop signal of the motor, the contours of the bolt ( 2 ) and of the latch ( 3 ) as well as the clearance (z) between the peripheral extension ( 9 ) of the rocker arm ( 7 ) and the slide ( 8 ) of the latch ( 3 ) being configured such that, when the bolt ( 2 ) is forced to adopt the closed position, when the latch ( 3 ) is rotated in a direction towards said bolt ( 2 ) by the action of the second spring, the latch ( 3 ) thrusts the peripheral extension ( 9 ) of the rocker arm ( 7 ), forcing the peripheral extension to swing in a direction opposite the first direction and to change position with respect to the drive cam ( 4 ), such that the drive cam ( 4 ) can be driven again, in the same rotation direction and without opposition of the rocker arm ( 7 ), until reaching the grip section ( 10 a ), to again open the lock ( 1 ).