Patent ID: 8500701

Claim:
A device for administering a product dose, the device comprising a display drum for displaying the product dose, a housing, a first conveying member moveable relative to the housing in a conveying direction, a second conveying member moveable relative to the housing in and counter to the conveying direction, the second conveying member in a first threaded engagement with the first conveying member while being rotationally movable relative to the housing and the first conveying member and being movable relative to the first conveying member counter to the conveying direction, a translational metering apparatus by which the product dose can be adjusted and which comprises the display drum, the display drum being rotationally movable relative to the housing while being translationally movable in and counter to the conveying direction in a second threaded engagement, a thread pitch of the second threaded engagement larger than a thread pitch of the first threaded engagement so that an axial dosing stroke of the display drum is longer than an axial dosing stroke of the second conveying member, a coupling element which interconnects the second conveying member and the display drum in a torsion-resistant manner in a coupling engagement which is releasable by actuating the device for administering, and an equalizer comprising a structure having a variable length for equalizing a difference in length of the axial dosing stroke of the display drum and the axial dosing stroke of the second conveying member to maintain the interconnection between the second conveying member and the display drum, secured against relative rotation, when the coupling engagement exists.