US Patent 10259135 Chainsaw apparatus having lubricating system

A chainsaw apparatus has a guide bar, a drive sprocket, and endless cutting chain mounted over the guide bar and over the drive sprocket, a first motor drivingly connected to the drive sprocket so as to cause the drive spot sprocket to move the endless chain over the guide bar, the first control device for controlling operation of the first motor and configured to deliver at least one first data representative of an operation of the motor, a storage tank suitable adapted to receive a lubricating fluid therein, a pump cooperative with the storage tank so as to deliver the lubricating fluid toward the guide bar and the endless cutting chain, a second motor drivingly connected to the pump, and a second control device for controlling operation of the second motor on the basis of a lubricating control parameter derived from the first data. The second motor is an electric motor.