Patent ID: 7441392

Claim:
A lawn mower ( 1 ), comprising: a front mounted mower deck ( 5 ) comprising at least one cutting knife, wherein the cutting knife is rotatably arranged in a substantially horizontal plane ( 10 ), a wheel suspension arrangement ( 19 ) connected to the mower deck ( 5 ) via a first pivot connection ( 33 ), at least one wheel ( 17 ) to be in contact with the ground so as to support the mower deck ( 5 ) during mowing, wherein the wheel ( 17 ) is connected to the wheel suspension arrangement ( 19 ) by means of an axle ( 21 ) in perpendicular alignment with the ground during mowing, and a cutting height adjustment device ( 27 ) connected to the mower deck ( 5 ) via a second pivot connection ( 37 ) and adapted to move the wheel suspension arrangement ( 19 ) with respect to the mower deck ( 5 ) for adjusting the mutual height relationship between the wheel ( 17 ) and the mower deck ( 5 ), so as to adjust the distance between the plane ( 10 ) of the cutting knife and the ground, the wheel ( 17 ) and the axle ( 21 ) being connected to the mower deck ( 5 ) through the suspension arrangement ( 19 ) and the cutting height adjustment device ( 27 ), characterised in that the axle ( 21 ) is pivotal about an axis ( 35 ) with respect to the wheel suspension arrangement ( 19 ) and connected to the cutting height adjustment device ( 27 ) in such a way that the axle ( 21 ) is parallelly displaced simultaneously with the movement of the wheel suspension arrangement ( 19 ) such that the perpendicular alignment of the axle ( 21 ) with the ground during mowing is automatically maintained.