Abstract: A motor-driven chain saw essentially includes a housing having a rear handle and a front handle and a drive unit attached to the housing. A guide bar for accommodating the saw chain for movement thereon is attached to the drive unit. The housing has an extension arm on the underside of the chain saw which extends to the front; the drive unit is seated on this arm and the front handle is attached to the front end of the arm. To increase torsional and bending strength, the extension arm has an S-shaped profile when viewed in cross section. The S-shaped profile has a substantially rectangular configuration and includes lower, middle and upper parts that are parallel to one another and are interconnected by two flanks. The flanks are located in planes that are parallel to the guide bar.

Abstract: A compact generator unit including a cooling system in which the engine and generator are mounted at points outside of the perimeter of the generator fan such that the generator fan serves to cool both the generator and the engine.

Abstract: This invention relates to an encased engine generator having an air-cooled engine and a generator housed in a case approximately structured in a rectangular parallelepiped, wherein a fuel tank is provided along the upper surface of the case, an engine having a cooling fan at its side is disposed within the case beneath said fuel tank, a generator interlocked with said engine is disposed at the downstream side of the cooling air from said cooling fan, a silencer is disposed between said fuel tank and generator so that its outer circumference may be cooled by part of said cooling air, and operating parts such as engine operation knob necessary for operation and maintenance are provided on the wall of the case which encloses the remaining cooling air.

Abstract: A portable engine-generator set is provide, which includes a soundproof cover defining an internal space for housing the components of the engine-generator set. The internal space comprises an intake compartment, a heat source compartment and an exhaust compartment. The heat source compartment comprises first and second sub-compartments which form independent cooling wind passages, each of the sub-compartments having an intake port in communication with the intake compartment. The exhaust compartment has an exhaust port in communication with the atmosphere, and intake ports in communication with the first and second sub-compartments such that air flow from the first and second sub-compartments are combined in the exhaust compartment.

Abstract: A full-covered portable generator composed of a generator core, an engine for driving the generator core enclosed by a cover comprising discrete front, rear and bottom cover elements. The rear cover element is detachably joined to the rear cover element along lateral peripheral surfaces of the generator. The engine and its main components are each covered at least in part by the front cover element in a manner that they are exposed when the rear cover element is detached from the front cover element, for facilitation of the maintenance thereof. Various controls and readouts or displays are arranged on the front cover element transversely of the generator, preferably in an order corresponding to the required order in which they are operated or read. A carrying handle is arranged on an upper surface of the front cover element and extends transversely of the generator.

Abstract: In a power-driven backpack type machine including a main body having an internal combustion engine serving as a power source, a throttle lever device including a boss pivotably connected to one side of the main body an arm extending from the boss, and a throttle lever supported at a forward end of the arm for controlling the operation of the internal combustion engine. Locking means is provided for selectively lockingly securing the boss to the main body in a position in which the arm is upright and substantially parallel to the vertical longitudinal axis of the main body and in a position in which the arm extends forwardly of the main body. Resilient pressing means forces the boss against the main body with an adjustable biasing force which is adjusted by adjusting means.

Abstract: An engine driven generator assembly comprises an internal combustion engine, e.g. a diesel engine and a generator driven by the engine, the engine and generator being mounted in a thermally and acoustically insulated housing provided with ports for cooling intake air and exhaust air and an aperture for an exhaust pipe. The engine is mounted in the housing substantially vertically over the generator, the engine having a substantially horizontal crankshaft which is situated substantially in the same vertical plane in which a substantially horizontal generator shaft is situated. A fuel tank for the engine is provided which constitutes at least a part of a wall of the housing to provide lateral stiffening reinforcement therefore. The ports for cooling intake air and exhaust air as well as the aperture for the exhaust pipe are provided in a common housing wall with the intake air port situated below the exhaust air port which in turn is situated below the aperture for receiving the exhaust pipe.

Abstract: A compact engine and blower contained in a portable casing. The engine fuel tank, its inlet port and the closure for the inlet port all are located within the casing, which has a cover openable, for access to the fuel inlet port. The casing cover can be latched closed only when the fuel inlet closure is properly placed on the inlet port.

Abstract: A portable engine-pump unit is provided with a charging system for maintaining a rechargeable starter battery in a fully charged condition while it is held in a stored position. The starter battery is used to energize heaters for raising the temperature of the engine fuel supply when the unit is removed from the stored position.

Abstract: In generator apparatus for the combined production of electrical energy and heat, of the type comprising a support casing housing an internal combustion engine with an air filter the inlet of which communicates with an aperture in a side wall of the casing, an electrical machine coupled to the engine, and electronic circuits for controlling the operation of the engine and the electrical machine, a covering and protecting element is fixable sealingly and removably to the outer surface of the side wall of the casing to define a region between the element and the wall. The electronic circuits are supported by at least one plate fixed to the outer surface of the side wall in the region between the wall and the covering and protecting element, and the element has at least one aperture through which this region communicates with the exterior. In operation of the apparatus, the electronic circuits are ventilated by air which is drawn in by the engine and flows into the region through said at least one aperture.

Abstract: A diesel piston engine having at least one modified cylinder adapted for use as an engine cylinder or as a compressor cylinder. The modified cylinder has an extra valve, a biasing member biasing the extra valve closed, and hydraulic means for controlling the sequential opening of the extra valve. The modified cylinder further includes a switching device for alternately disconnecting the hydraulic means and permitting normal fuel injection or connecting the hydraulic means and preventing normal fuel injection.

Abstract: A method for improving efficiency of an internal combustion irrigation engine is provided by the present invention. In one embodied form, the method comprises the steps of: channelling an inlet air stream to the engine through a single pass air cooler at a flow rate of between about 200 cubic feet per minute and about 5000 cubic feet per minute, the air cooler being a counter current flow packed cooling tower utilizing irrigation water as cooling means; directly contacting the inlet air stream with irrigation water in the air cooler to bring the temperature of the air stream within a range of between about 55.degree. F. and about 75.degree. F. and a relative humidity within a range of between about 90% and 100%; admixing the cooled and humidified inlet air stream with fuel; and directing the resultant gaseous mixture to a combustion chamber of the internal combustion irrigation engine.

Abstract: An electric drive mechanism for vehicles, especially buses with overhead trolley routes, which routes are provided with relatively short interruptions in the overhead trolley. The drive mechanism includes a flywheel two externally excited electric motors which are adapted to be switched over from prime mover operation to generator operation, and which motors are effective as a Ward-Leonard drive during flywheel operation. The first electric motor is constructed for half of a maximum drive power and the second electric motor is likewise constructed for half or for .sqroot.2/2 times the maximum drive power. Both electric motors are connected electrically in parallel during operation from the main electrical supply. The first and second motors are electrically connected in parallel during operation of the vehicle from the main electrical supply when a change-speed transmission is provided for connecting a drive shaft of one of the motors with driven vehicle wheels.

Abstract: A hand-held power tool comprises a drive unit including a first housing, a combustion motor located in and fixed to said first housing and having an output shaft; and a work unit including a rotatable tool, an input shaft, a transmission between the input shaft and the tool for driving the latter and a second housing. A quick-connection arrangement is provided for releasably connecting the first to the second housing and a coupling arrangement coaxial with the connection arrangement serves to couple the output shaft with the input shaft.

Abstract: The engine is of the continuous combustion type having two multiple piston banks separated by a centrally disposed undulating spider drive member operated from the piston action and adapted to drive the output power shaft of the engine. The engine comprises a water-jacketed block defining preferably eight cylinders in each bank for receiving eight pistons in each bank. Aligned pistons of respective banks are interconnected in a linear non-rotatable arrangement with the spider drive member. The spider drive member is continuously skewed to the output shaft, includes bearing means and operates on an eccentric basis driven from the piston connecting rods on a timed basis. The output power shaft supports a rotor defining valving ports including upper and lower intake ports and a transfer port. The gas-air carburization occurs within the rotor with the use of a porous medium.

Abstract: A solar-energy-process-converter system whereby the energy from the sun is accumulated and projected by a parabolic reflector so as to impinge upon a cluster of thermocouples to create electrical energy for activating an electrolysis unit through which hydrogen and oxygen are generated and stored. The system can also include a steam-turbine electrical-generator plant that is adapted to be operated by the burning of the hydrogen and oxygen, and the gases can further be used to establish heat to drive a thermocouple electrical-generator plant, wherein the stored hydrogen is further employed as a fuel for vehicle and other engines.

Abstract: Apparatus for the combined production of heat and electrical energy comprising an internal combustion engine driving an electricity generator and enclosed in a thermally insulated housing with heat exchangers for extracting heat from the engine coolant, the engine oil, the exhaust gases from the engine and from the electricity generator, and for transferring this heat to an external heating circuit, in which all the components are carried by a rectangular or cubic supporting framework to which the thermal and acoustic insulation panels are attached by quick-release fastenings, the engine and generator being connected together to form a rigid unit which is suspended from the framework while the ignition equipment of the engine is housed externally of the framework and cooled by the incoming air being drawn into the engine flowing through a housing in which it is supported.

Abstract: A power plant for simultaneously generating electric power and pneumatic pressure which comprises an engine, dynamo and compressor all juxtaposed, and wherein the crankshaft of the engine is disposed on the axis of a common shaft to the dynamo and compressor to be drivingly coupled to the common shaft and jointly rotated with the common shaft, thereby simultaneously generating electric power and pneumatic pressure.

Abstract: It is common practice to discharge waste vapors from certain chemical processes into the atmosphere. Many of these vapors, usually referred to as "vent gases", contain compounds which are considered to be pollutants in the atmosphere. In this invention the vent gases are oxidized in the combustion chamber of a Diesel engine before release to the atmosphere. The oxidation step reduces the concentration of noxious compounds in the vapor to a level acceptable for atmospheric discharge.