Abstract: A walk-behind work machine having a foldable operating handle is disclosed. The operating handle is swingable and foldable about a first linking pin relative to a handle-attachment part of a work-machine body from a usage position to a storage position and can be locked in a usage position by a second linking pin. The second linking pin is present on one of the operating handle and the handle-attachment part, and the distal end part of the second linking pin is formed in a tapered shape. The other of the operating handle and the handle-attachment part has a second pin-fitting hole allowing insertion and retraction of the distal end part. When the distal end part is fit into the second pin-fitting hole, no gap is present in the second pin-fitting hole due to the tapered surface of the distal end part, and the operating handle is locked in the usage position.

Abstract: A walk-behind work machine having a foldable operating handle is disclosed. The operating handle is swingable and foldable about a first linking pin relative to a handle-attachment part of a work-machine body from a usage position to a storage position and can be locked in a usage position by a second linking pin. The second linking pin is present on one of the operating handle and the handle-attachment part, and the distal end part of the second linking pin is formed in a tapered shape. The other of the operating handle and the handle-attachment part has a second pin-fitting hole allowing insertion and retraction of the distal end part. When the distal end part is fit into the second pin-fitting hole, no gap is present in the second pin-fitting hole due to the tapered surface of the distal end part, and the operating handle is locked in the usage position.

Abstract: A walk-behind lawnmower is provided with a height adjusting mechanism for adjusting the height of a housing above the ground. The height adjusting mechanism includes a front wheel supporting member and a rear wheel supporting member that are attached to the housing so as to be capable of swinging up and down; a linking member for linking the front and rear wheel supporting members so as to be capable of associated motion; and a locking mechanism for restricting and releasing displacement of the linking member in the forward and backward direction. The front wheel supporting member or the rear wheel supporting member has an arcuate part, the arcuate part having on an arcuately shaped outer circumferential surface a display part for displaying the height of the blade. The display part is viewed through a peephole formed in the housing.