Patent ID: 7496990

Claim:
A grass mower comprising: a main body provided with a first and second side capable of guided movement adjacent to and over the ground; a motor contained in a motor housing of the main body; a cutting unit driven by the motor disposed in the motor housing; an elongate handle assembly extending rearwardly from the main body into a handle to permit an operator to guide the main body during its guided movement over the ground, wherein the elongate handle assembly includes a lower frame including a pair of lower arms each having a proximal end secured to the first and second side of the main body respectively and a distal end to form a first joint portion and an upper frame provided with a second joint portion; an elongate shaft for pivotally coupling the second joint portion to the first joint portion such that the relative position of the upper frame and the lower frame is rotationally adjustable; a first engaging unit carried on the first joint portion and a second engaging unit carried on the second joint portion, wherein either the first engaging unit is equipped with a plurality of engaging points which is disposed along an arc around the elongate shaft, wherein the second engaging unit is selectively engageable with more than one selected one or set of the plurality of engaging points, or the second engaging unit is equipped with a plurality of engaging points which is disposed along an arc around the elongate shaft, wherein the first engaging unit is selectively engageable with more than one selected one or set of the plurality of engaging points; and at least one locking arrangement for locking the position of selected engagement of the selected one or set of the plurality of engaging points with the first engaging unit or second engaging unit wherein the locking arrangement comprises a locking member disposed between the lower arms.