Apparatus for adjusting the height of a tool such as a lawnmower, particularly for gardening vehicles

A lawnmower having an apparatus for adjusting the height of a lawnmower tool of said lawnmower which comprises front wheels whose height can be manually adjusted by a user on corresponding supports that are rigidly coupled to a front portion of protective housing suitable to form a chassis of said lawnmower tool, further comprising:

• a rear linkage, which is articulated in a lower region to a rear portion of said protective housing of the lawnmower tool,
• a crank whose length can be manually adjusted by a user, said crank being arranged above the housing along the lawnmower advancement direction, with a front end that is articulated in an upper region to said front portion of said housing and a rear end that is articulated to an upper end of said rear linkage whereby said crank is manually rotatable by a user at said front portion of said housing about an axis extending in said lawnmower advancement direction upon manual adjustment thereof by the user;
• said linkage being rigidly coupled to a support that is articulated to a chassis of said vehicle, articulation points of said linkage and said crank and a common axis of rotation of said wheels providing joints of an articulated quadrilateral constituted by said housing, said linkage, said crank and said supports, and such that the articulation connections of the front end of said crank to said front portion of said housing and of the rear end of said crank to said upper end of said rear linkage provide an articulated movement of said rear linkage to selectively raise and lower the height of said chassis of said lawnmower tool upon manual rotation adjustment of said crank whereby the height of said front wheels are separately manually adjustable.