Patent ID: 8485272

Claim:
A mobile soil aerating device comprising: a machine frame, a drive, at least one penetration tool moved up and down by the drive and being hingedly coupled with the machine frame, the penetration tool being adapted to be driven into the soil and to be pulled out again, the penetration tool being pivotable with respect to the machine frame during a penetration phase in which the penetration tool is in the soil, the penetration tool, prior to penetration, being in an initial position at a predetermined penetration angle, wherein the initial position is defined by a stop element, and wherein, at least after having pulled the penetration tool from the ground, at least one element engaging the penetration tool and coupled to the machine frame exerts a restoring moment on the penetration tool in order to pivot the penetration tool back to the initial position, wherein during the phase in which the penetration tool is pulled out from the soil only a restoring moment is exerted on the penetration tool, wherein, during the phase in which the penetration tool is in the soil, the at least one element engaging the penetration tool exerts a moment on the penetration tool that is opposite to the restoring moment.