Patent ID: 8042680

Claim:
A sampler having a worm shaft, a geared motor and a mixer which comprises a mixer agitator that can be driven by means of the geared motor, characterized in that a releasable coupling for releasable coupling connection of the worm shaft and the mixer agitator is disposed between the mixer agitator and the worm shaft, the coupling having a first and a second coupling part with means for transmitting torque, provision being made for the first coupling part to have a projection which extends in the direction of the geometric axis of rotation and in the lateral surface of which a first peripheral groove is formed, for the second coupling part to have a recess, the cross-section of which is adapted as a receptacle for the projection and in the lateral surface of which a second peripheral groove is formed, and a ring-like locking member being provided, which is elastically deformable in terms of the contour of its periphery, said locking member insertable into a peripheral groove or selectively into one of the peripheral grooves when the two coupling parts are in the disconnected state, and the contour of said locking member protruding out of this peripheral groove when the two coupling parts are in the disconnected state.