Patent ID: 8166737

Claim:
A walk-behind lawnmower designed to travel under motor power or manpower while cutting grass, the walk-behind lawnmower comprising: a housing; a blade, housed within the housing, for cutting away the grass; and a height adjusting mechanism for adjusting a height of the housing and the blade with respect to the ground, wherein the height adjusting mechanism includes: front wheel supporting members, linked vertically swingably to a front part of the housing, for supporting front wheels; rear wheel supporting members, linked vertically swingably to a rear part of the housing, for supporting rear wheels; a linking member for linking together the front wheel supporting members and the rear wheel supporting members so as to enable the front wheel supporting members and the rear wheel supporting members to move in an interlocked manner, the linking member being displaceable in a forward-and-backward direction and in a vertical direction in correspondence with swinging movements of the front wheel supporting members and the rear wheel supporting members; and a locking mechanism for restricting and releasing the displacement of the linking member in the forward-and-backward direction, the locking mechanism including: a plurality of locking grooves formed in a row from front to rear on the linking member; a locking pin capable of selectively interlocking with one of the locking grooves, the locking pin being substantially J-shaped and comprising a link-receiving part at an upper end thereof, a first perpendicular part that extends downwardly from the link-receiving part, a horizontal interlocking part that extends laterally from the lower end of the first perpendicular part, and a second perpendicular part that extends upwardly from the interlocking part; a pin-guiding part, provided to the housing, for slide-guiding the locking pin in an entry-retraction direction with respect to one of the grooves; and an operating member, provided to the housing, for slide-operating the locking pin.