Abstract: A power cutter which comprises a main body provided with a motor, a work-cutting portion including a circular cutting blade to be rotated by the motor and a safety cover covering both sides of an edge portion of the cutting blade so as to form a dust-discharging passageway, a fan attached to the safety cover for sucking and removing dust generated during cutting operations through the dust-discharging passage, a barrier wall attached to the safety cover so as to intercept the dust-discharging passageway, and a main dust-sucking port and a supplementary dust-sucking port disposed respectively in front of and behind the barrier wall as viewed in the rotational direction of the cutting blade.

Abstract: A dust collector-equipped power cutter, which is easy to handle in operation and convenient for storage and transportation thereof and is capable of preventing dusty air from flowing back to the cutter portion when a cutting operation is interrupted, includes a main body, a cutter, a dust-sucking fan, and a dust hose assembly. The dust hose assembly includes a first dust hose section and a second dust hose section and a hose connector joining the first hose section and the second hose section. Each of the hose sections has a spiral rib on an outer peripheral surface, and the hose connector has a spiral groove on an inner wall of each end portion, the dust hose section and the hose connector being adapted to be interconnected with each other through a threaded engagement between the spiral rib and the spiral groove. The hose connector is provided with a check valve to prevent back flow when a cutting operation is interrupted or terminated.

Abstract: A blower pipe is disclosed which is substantially prevented from being damaged, which is easily applicable even to a varied operation site to thereby attain improved operating characteristics, and which can be produced at a reduced cost. The blower pipe (31) is utilized in a power blower, and has its upstream end formed into proximal connecting means (33) and its downstream end formed into a blow-off opening (32), and has its bottom portion (36) provided with an arc-shaped expanded portion (34) in the vicinity of the blow-off opening (32).

Abstract: A working machine such as a power blower has a blower pipe with a silencer. The blower pipe has an outer pipe and a perforated inner pipe, with a sound absorbing material disposed between the inner and outer pipes. For ease of handling in use of the power blower, the outer pipe has substantially constant diameter. For ease of storage, the pipe is detachable.

Abstract: In a portable work machine having a prime mover, a driven unit such as a fan to be driven by the prime mover, a machine case made of synthetic resin and including an inlet port case, a central case and an engine case, a bottom portion of the central case is integrally formed with stands each having a hollow which opens at one side end of the bottom portion. A cutting is formed in the bottom portion to provide the hollow with an upper wall which opens partly. The bottom of the stand is formed with a raised edge.

Abstract: A muffler structure for an internal combustion engine is disclosed which is capable of diminishing occurrence of fraying and lowering of exhaust gas cleaning performance and durability, and which enables replacement of the catalytic cloth and the like to readily be carried out. The muffler structure for an internal combustion engine comprises a muffler 10 and a catalytic assembly 30 disposed in the muffler 10, the catalytic assembly 30 including a spark arresting wire mesh 32 and a catalytic cloth 37 fitted over the spark arresting wire mesh 32, the catalytic cloth 37 has its peripheral edge 37a covered entirely or in substantial part and retained with side walls 34, 34, 36 peripherally provided on the spark arresting wire mesh 32.

Abstract: A vacuum cleaner that includes a stationary blade that acts also as a bearing in a suction pipe connected with a fan in the axial line of rotation shaft of the fan. A transmission shaft supported by the bearing extends from the fan rotation shaft of the fan and through the bearing. A rotary blade is mounted at the end of the transmission shaft that extends through the bearing and cooperates with the stationary blade to chop the sucked material finely.

Abstract: A power blower includes a fan case arranged fore and aft in the axial direction of a fan; and an engine, wherein a central opening having an inner diameter larger than the outer diameter of the fan is formed on a front member of the fan case, and a lid member is releasably mounted on the central opening.

Abstract: A backpack power blower apparatus including a frame carrying an engine and a blower. The frame is provided with a sound insulating planar member for reducing noises produced by the engine and the blower, the sound insulating planar member including opposite side portions extending rearwardly from a front portion of the frame and a rear portion extending between the opposite side portions at rear end portions thereof whereby the sound insulating planar member surrounds a machine body, including the engine and the blower, at least at opposite sides and a rear side of the machine body.

Abstract: A backpack frame comprises a main frame portion and right and left guard portions, which are integrally formed at the both sides of the main frame portion through thin wall portions and which are respectively bent at the thin wall portions toward one side of the main frame portion, the main frame portion and the guard portions being connected and fixed to each other to from a U-shaped form as a whole.

Abstract: A pipe structure comprises a handle member formed as an integral molded part which is divided into two half bodies along the axial direction of a pipe member, a hinge portion being connected between the opposite edges of the half bodies which are combined by bending at the hinge portion so as to be mounted around the pipe member.

Abstract: A fluid jetting pipe for discharging fluid jets. Variable outlet members are disposed at an outlet end of the jetting pipe such that the outlet opening area through which the fluid jets are allowed to discharge from the jetting pipe is fully opened in a normal state and can be narrowed down on demand.

Abstract: A nozzle pipe supporting handle comprises flange portions disposed at both sides of a slit of a mounting portion, wherein the inner sides of the flange portions are press-fitted to the outer sides of a grip portion so that the grip portion can be held in such a manner that the mounting position thereof can be changed relative to a nozzle pipe.

Abstract: A backpack-type power working machine comprising: a carrying frame having side guard sections on both sides thereof, a fan attached to the carrying frame through intermediation of vibration-damping members, an engine connected to the fan, and an air cleaner having side end sections and situated at a position behind the fan and above the engine, the side end sections of the air cleaner being respectively attached to the side guard sections of the carrying frame.

Abstract: An internal combustion engine with an automatic starter for a portable working machine, wherein a reduction device is arranged at an end portion opposite to an output end of a crankshaft of the internal combustion engine, a generator being arranged at a side near the reduction device, the automatic starter being arranged in the proximity of a side portion of the internal combustion engine and being drivingly connected to the reduction device, a recoil-type starter being arranged coaxially with and adjacent to the end portion of the crankshaft.

Abstract: A power tool comprises a throttle lever pivotally provided at a rear end portion of a handle and extending inside the handle toward a front end portion of the handle; a finger engaging portion formed at the front end portion of the throttle lever in such a manner as to project from the handle to the outside; wherein a rear-end portion of the throttle lever is connected with a throttle valve of the internal combustion engine by means of a connecting member, and, when the throttle valve is at an idling position, the finger engaging portion of the throttle lever is held at a position where the finger engaging portion projects from the handle to the outside.

Abstract: Disclosed is an internal combustion engine driven device having a knob which is operationally linked with a choke valve and is adapted to move the choke valve from the open position to the closed one. Provided on this knob are a movable contact including a contact section formed thereon, and a push-button switch for bringing this movable contact into contact with stationary contacts so as to supply the starter motor with electricity.

Abstract: A starting system for an internal combustion engine wherein an output shaft of a reduction device of an automatic starter is arranged into and passing through an axial bore formed in a boss portion supporting a recoil drum of a recoil-type manual starter, and a second connecting member of a clutch device is arranged on the output shaft in such a manner that the second connecting member can be shifted axially to engage or disengage with respect to a first connecting member of the clutch device.

Abstract: A power equipment includes an exhaust pipe member disposed near a muffler, the exhaust pipe member having an exhaust gas passage portion which communicates with the outlet of the muffler and an outlet passage portion whose downstream end has a downstream outlet end communicating with the atmosphere. The power equipment further includes a tubular member for introducing a portion of compressed air flow from a blower, and a gap is formed between an opening formed in the exhaust pipe member and an adjacent end of the tubular member. A guide tube member defines the opening in the interior of the upstream end of the exhaust pipe member.