Abstract: A lawn mower may include a blade housing configured to house at least one blade, an engine supported at least in part by the blade housing to selectively rotate the at least one blade, a handle assembly comprising at least one handle member for guiding operation of the lawn mower by an operator walking substantially behind the lawn mower, and a handle height adjustment assembly. The handle height adjustment assembly enables the handle member to be fixed in at least a first operating position or a second operating position each of which defines different handle heights for the handle member responsive to the handle height adjustment assembly being in a locked state, and enables the handle member to be rotated between the first operating position, the second operating position, and a folded position responsive to the handle height adjustment assembly being in an unlocked state.

Abstract: A work machine having a loop-shaped operating handle connected to an upper end part of a handle post. The operating handle pivots to positions in the longitudinal direction of the work machine across a longitudinal axis of the handle post as a baseline.

Abstract: A walk-behind working machine has a machine body and a wheel mounted on the machine body for undergoing rotation to move the walk-behind working machine along a ground surface. A cultivator device is mounted on the machine body for cultivating the ground. A working device attachment is removably connected to the machine body for working the ground. A connection mechanism removably connects the working device attachment to the machine body. The connection mechanism has a pair of link members each pivotally connected at a first end portion thereof to the working device attachment and a control unit for controlling a position of the working device attachment with respect to the ground surface so that when the working operation, the first end portions of the link members are disposed closer to the ground surface than the second end portions of the link members.