Abstract: A backpack blower working machine includes: a back frame worn to be carried on a back of a worker; a volute case mounted on the back frame; a centrifugal fan equipped in the volute case; an electric motor assembled to the volute case and configured to rotate the centrifugal fan; and a battery attached to the back frame and configured to supply the electric motor with electricity. The back frame includes an upper section and a lower section. Shoulder belts for carrying and the volute case are provided on the upper section. A battery arrangement space for the battery is provided in the lower section, and has a length in an up-and-down direction and a length in a right and left direction each of which is longer than a length in a front-to-back direction.

Abstract: A shoulder harness includes a harness network (102) composed of right and left shoulder belts (104) and a side-fitting belt (114) for fitting on the left side of an operator's chest and joining at one end with front ends of the shoulder belts (104) on a stomach area of the operator. The shoulder harness further includes an intermediary member (120) connected to the harness network (102) via a holding member (122) and supporting a hook (108) for retaining a working machine. The right and left shoulder belts (104) are shaped asymmetric such that a shoulder-fitting portion (110Le) of the left shoulder belt (104Le) curves or slants toward the working machine retained on the hanging element (108).

Abstract: A shoulder harness includes a harness network (102) composed of right and left shoulder belts (104) and a side-fitting belt (114) for fitting on the left side of an operator's chest and joining at one end with front ends of the shoulder belts (104) on a stomach area of the operator. The shoulder harness further includes an intermediary member (120) connected to the harness network (102) via a holding member (122) and supporting a hook (108) for retaining a working machine. The right and left shoulder belts (104) are shaped asymmetric such that a shoulder-fitting portion (110Le) of the left shoulder belt (104Le) curves or slants toward the working machine retained on the hanging element (108).

Abstract: A backpack type power working machine includes a movable stopper for restricting the turning angle of an internal combustion engine unit which is supported on a backpack frame so that it turns about a longitudinal axis. As a result, the turning angle restriction of the internal combustion engine unit can be released by just moving the movable stopper, whereby a job efficiency can be improved.