Setting appliance with axially blockable drive shafts, setting method and expansion anchor therefor

The invention relates to a setting appliance for an expansion anchor, which has an expansion sleeve and an expansion body, arranged in the expansion sleeve, for the expansion sleeve, having an inner drive shaft for axially driving the expansion body forward in the expansion sleeve, having an outer drive shaft, surrounding the inner drive shaft, for rotationally driving and axially driving the expansion sleeve forward into a substrate, wherein the inner drive shaft has, in a rear region, a plug-in end for inserting into a percussion drilling machine, and wherein the outer drive shaft is mounted on the inner drive shaft so as to rotate therewith and at the same to be axially displaceable at least within limits, and having a releasable blocking device with which, in order to transmit forwardly directed axial forces from the inner drive shaft to the outer drive shaft, a forward axial displacement of the inner drive shaft relative to the outer drive shaft is temporally limitable. The invention also relates to a se