Abstract: A mixer device 1 includes a drum 3 configured to store materials to be mixed; a device body 4 configured to rotatably support the drum 3; an electric motor 6 configured to apply a rotational driving force to the drum 3; and a battery 8 configured to supply electric power to the electric motor 6, wherein the battery 8 is arranged below the drum 3.

Abstract: A concrete vibrator (1) includes: a vibration generating member (4) that includes a rotating body (3) and generates vibration according to rotation of the rotating body (3); an electric motor (5) that applies a rotational driving force to the rotating body (3); a support member (7) that supports the electric motor (5); and a battery (8) that supplies electric power to the electric motor (5), wherein the battery (8) is disposed above the electric motor (5).

Abstract: A shroud includes a first shroud that covers a first side face to which a muffler is adjacent among four side faces that an engine has, a second shroud that covers a second side face adjacent to the first side face and a third side face, and a third shroud that sections a muffler space for housing the muffler with the first shroud, the first shroud and the second shroud form an upstream side air guide path that makes cooling air flow around the engine, and the muffler space is connected to a downstream side of the upstream side air guide path.

Abstract: A shroud includes a first shroud that covers a first side face to which a muffler is adjacent among four side faces that an engine has, a second shroud that covers a second side face adjacent to the first side face and a third side face, and a third shroud that sections a muffler space for housing the muffler with the first shroud, the first shroud and the second shroud form an upstream side air guide path that makes cooling air flow around the engine, and the muffler space is connected to a downstream side of the upstream side air guide path.