Lawnmower

A lawnmower, comprising:

• a body having a bottom side, a front end, and a rear end;
• a plurality of cutting blades rotatably positioned on the bottom side;
• a roller positioned on the bottom side of the body to support the rear end of the lawnmower and being configured to roll as the lawnmower is moved over a surface during operation thereof, the roller being a single roller having a spherical shape and being the only support in direct contact with the ground for the rear end of the lawnmower;
• a roller housing located on the body wherein the roller housing is generally hemispherical and configured such that the roller rotates therein;
• wherein the lawnmower is supported only by a pair of wheels on the front end of the body and the roller on the rear end of the body such that only a single roller supports the lawnmower;
• wherein the roller is passive and not driven by gearing nor by a motor;
• wherein the body comprises a lower chassis and an upper chassis, the lower chassis having the plurality of cutting blades on a bottom lower chassis side thereof, the upper chassis being stepped up from a rear lower chassis end of the lower chassis to form a shoulder therebetween, the roller housing being located below the upper chassis and above a plane defined by the lower chassis;
• wherein a radius of the roller is equal to or greater than a vertical distance between the bottom lower chassis side of the body and a farthest point of the pair of wheels;
• and
• wherein the body has first and second lateral sides, the roller being positioned on the upper chassis generally centrally between the first and second lateral sides;
• and
• wherein the lawnmower further comprises a hydraulic fluid reservoir is located on a top upper chassis side of the upper chassis and vertically positioned over the roller;
• a hydraulic axial piston positioned on the lower chassis for driving the plurality of cutting blades;
• a hydraulic pump motor is located on the bottom lower chassis side of the housing and is configured to drive all of the plurality of cutting blades of the lawnmower such that the lawnmower is operated without using any internal combustion engines and without requiring any conduit to an external power supply.