Patent ID: 6889801

Claim:
A transmission brake for a rotational member comprising: a motor for driving the rotational member in a drive direction, the transmission brake allowing rotation of the rotational member in an opposite direction only to the extent that the motor is driven in this opposite direction, a clutch positioned between the rotational member and a non-rotational housing, and a ramp for disengaging the clutch when the rotational member is rotated in the drive direction but not the motor in a direction opposite to the drive direction; wherein rollers are arranged between inclined ramp surfaces on a ramp ring, connection to a rotor of the motor, and a ramp sleeve for disengaging the clutch against the spring bias and there is a rotational play between the ramp ring and the rotational member; and wherein a driver pin extending through the shaft is in engagement with recesses in a radial end surface of the ramp ring, which is rotationally arranged on the rotational member.