Patent ID: 6749049
Filing Date: 2004-06-15
Classification: A01B,F16D

Abstract:
A torque limiting coupling comprising:a longitudinal axis defined by the torque limiting coupling, said torque limiting coupling rotatable around said longitudinal axis; a coupling hub having through holes distributed around a circumference; transfer elements adjustably held parallel to the longitudinal axis; a coupling sleeve driving the coupling hub in a rotational driving direction, said coupling sleeve having first recesses corresponding to said through holes; a switching disk rotatably positioned between a torque transmitting position and a freewheeling position relative to the coupling hub; said transfer elements urged in the direction towards the coupling hub by an axially acting spring, said transfer elements engaging the recesses of the coupling sleeve for the torque transmission; said switching disk transferred from the torque transmitting position to the freewheeling position by said transfer elements rolling off said recesses when a predetermined nominal torque is exceeded, second recesses in said switching disk corresponding to said through holes, wherein said transfer elements engaging said second recesses in the freewheeling position; a locking pawl movable between a releasing position and a retaining position, said locking pawl interacts in the retaining position with a radial selector face on the circumference of the switching disk such that the switching disk can be transferred from the torque transmitting position to the freewheeling position and said locking pawl interacts in the retaining position with a radially extending first retaining face of the coupling hub retained against rotation around the longitudinal axis in the rotational driving direction; and an element coupled with said locking pawl interacting in the retaining position of the locking pawl with the coupling hub such that the coupling hub is retained against a rotation opposite to the rotational driving direction.