| Patent Number |
Title Of Patent |
Date Issued |
| 5259352 |
Membrane fuel pump for a membrane carburetor |
November 9, 1993 |
| The invention is directed to a membrane fuel pump for a membrane carburetor of an internal combustion engine. The carburetor has a pressure controller and the engine has a crankcase wherein pressure fluctuates during the operation thereof. The membrane fuel pump includes a pump membrane |
| 5257568 |
Saw chain |
November 2, 1993 |
| The invention is directed to a saw chain for a motor-driven chain saw equipped with a guide bar and a drive motor for imparting a force to the saw chain for moving the latter around the guide bar in a predetermined running direction. The saw chain includes a plurality of side cutting |
| 5249363 |
Guide bar having a lamellar assembly and method of making the same |
October 5, 1993 |
| The invention is directed to a guide bar for guiding the saw chain of a motor-driven chain saw. The guide bar of the invention has a lamellar configuration and is not made of three parts as are conventional guide bars. Instead, the guide bar of the invention is made of two side parts. |
| 5245757 |
Motor-driven chain saw having a grab handle |
September 21, 1993 |
| The invention relates to a motor-driven chain saw having a motor mounted in a housing for driving a saw chain on a guide bar. The guide bar extends forwardly in the longitudinal direction of the chain saw from a forward housing end face. The housing is held by a grab handle for holding a |
| 5233750 |
Chain saw having a sprocket wheel cover and a brake device integrated into the cover |
August 10, 1993 |
| The invention is directed to a motor-driven chain saw having a housing and a guide bar extending forward of the housing. The guide bar is clamped between the housing and a sprocket wheel cover. A brake device having a trigger configured as a hand guard is mounted in the sprocket wheel co |
| 5231956 |
Portable handheld work apparatus |
August 3, 1993 |
| The invention is directed to a portable handheld work apparatus including a motor-driven chain saw, cutoff machine and the like. The work apparatus includes a housing and an internal combustion engine mounted in the housing for driving a work tool. The housing defines a space from which |
| 5223770 |
Portable handheld work apparatus having an electric drive motor |
June 29, 1993 |
| The invention relates to a portable handheld work apparatus having an electric drive motor mounted in a housing. A switch unit switches a supply voltage onto the drive motor. The switch unit is actuated by a switching extension of a switching lever journalled in a handle of the work |
| 5215049 |
Portable handheld work apparatus |
June 1, 1993 |
| The invention relates to a work apparatus such as a motor-driven chain saw having an internal combustion engine equipped with an electrical ignition system. Combustion air is supplied via an intake channel and fuel is supplied via a carburetor. The intake channel is provided with a throt |
| 5209196 |
Operating-mode position selector arrangement for internal combustion engine |
May 11, 1993 |
| The invention relates to an operating-mode position selector arrangement for an internal combustion engine in a portable handheld tool such as a motor-driven chain saw. The engine includes an electrical ignition system and is supplied with a fuel mixture by a carburetor. In a start posit |
| 5199389 |
Work apparatus having an air-cooled internal combustion engine |
April 6, 1993 |
| The invention in directed to a work apparatus such as a motor-driven chain saw having a housing and an air-cooled internal combustion engine mounted therein. An exhaust-gas muffler is mounted in proximity to the cylinder of the engine. A flow of cooling air for cooling the cylinder is gu |
| 5197418 |
Fuel injection pump for a two-stroke engine |
March 30, 1993 |
| The invention is directed to a fuel injection pump for a two-stroke engine which is especially for portable handheld tools such as motor-driven chain saws or the like. A pneumatic drive chamber is provided in the pump housing which is partitioned by a membrane into a pulse chamber charge |
| 5197417 |
Fuel injection pump for a two-stroke engine in a work apparatus such as a motor-driven chain saw |
March 30, 1993 |
| The invention is directed to a fuel injection pump for a two-stroke engine mounted in a work apparatus such as a motor-driven chain saw. The injection pump includes a pneumatic drive chamber which is charged with the crankcase pressure of the two-stroke engine. A membrane mounted in the |
| 5175932 |
Portable handheld tool having a drive shaft rotatably journalled in a protective tube |
January 5, 1993 |
| The invention is directed to a portable handheld tool such as a brushcutter which includes a work tool assembly and a drive motor connected by a drive shaft. The drive shaft is surrounded by a protective tube and is centrally held therein by means of a bearing sleeve unit. The bearing sl |
| 5168837 |
Motor-driven work apparatus |
December 8, 1992 |
| The invention is directed to a work apparatus having a fan wheel driven by a motor mounted in a housing. A fan cover covers the fan wheel and defines a plurality of air-inlet openings arranged in a grid-like pattern forward of the fan wheel through which a first component flow of cooling |
| 5165565 |
Closure for a vessel |
November 24, 1992 |
| The invention relates to a closure for closing a vessel for holding liquid such as a fuel tank or the like. The closure includes a cylindrical, cup-shaped base body having an internal thread. The base wall of the base body has an inner wall surface on which a centrally aligned annular wa |
| 5153967 |
Handle for a pull-rope starter |
October 13, 1992 |
| The invention is directed to a handle for a pull-rope starter. The handle includes a T-shaped base body having an elongated part extending in the direction of the pull rope and a handle part extending transversely to the elongated part. The elongated part has a receptacle for accommodati |
| 5145044 |
Two-handle arrangement for a handheld portable tool |
September 8, 1992 |
| The invention relates to a two-handle arrangement for a handheld portable tool having a drive motor and equipped with forward and rearward handles for two-handed operation. Each of these handles includes respective actuating elements which can be actuated only in a specific sequence. |
| 5073307 |
Membrane carburetor for an internal combustion engine of a handheld portable tool |
December 17, 1991 |
| The invention relates to a membrane carburetor having an air filter connected upstream of the intake channel. The combustion air passes through the air filter and into the intake channel of the carburetor and coacts with the fuel drawn into the intake channel to form a fuel/air-mixtu |
| 5065708 |
Internal combustion engine for a portable handheld work apparatus |
November 19, 1991 |
| The invention is directed to an internal combustion engine for a portable handheld work apparatus with an intake pipe or induction elbow being attached to the cylinder. The engine can be a two-stroke engine having an inlet opening in the cylinder for the combustion mixture. A cylinder |
| 5042350 |
Saw chain for a motor-driven chain saw |
August 27, 1991 |
| The invention is directed to a saw chain for a motor-driven chain saw equipped with a guide bar and a drive motor for imparting a force to the saw chain for moving the latter around the guide bar in a predetermined direction. The saw chain includes: a plurality of cutting links, a pl |
| 5036648 |
Cutterhead for a vegetation cutter apparatus |
August 6, 1991 |
| The invention relates to a cutterhead for vegetation cutter apparatus and has as its object to configure the cutterhead so that the cutterhead as a unit can be built so as to be overall constructively small and reduce wear. The cutterhead controls the spool having the filament with the a |
| 5010858 |
Starter arrangement for an internal combustion engine |
April 30, 1991 |
| The invention is directed to a starter arrangement for an internal combustion engine wherein a manual starter device is combined with an electrical starter. Handheld portable tools such as motor-driven chain saws, brushcutters and the like are driven by two-stroke engines which can b |
| 5010649 |
Cutterhead for a vegetation cutter apparatus |
April 30, 1991 |
| The invention is directed to a cutterhead for a rotatably-driven vegetation cutter apparatus defining a drive axis about which the cutterhead is rotatably driven. The cutterhead includes a housing adpated to be rotatably driven by the vegetation cutter apparatus about the drive axis |
| 4999918 |
Motor chain saw having a guide bar clamped between the housing and a clamping piece |
March 19, 1991 |
| The invention relates to a motor chain saw having a guide bar clamped between the housing and a clamping piece. The chain saw has a drive motor arranged in a housing and the drive motor drives a saw chain running on a guide bar. The guide bar is clamped to the housing at one end between |
| 4996774 |
Guide bar for the saw chain of a motor-driven chain saw and a method and apparatus for producing |
March 5, 1991 |
| The invention is directed to a guide bar which includes a fill body in the guide groove thereof. The fill body is disposed in the region of a lubricating bore and bridges the gap between the bottom of the groove and the rakers of the drive links of the saw chain. The fill body raises the |
| 4989321 |
Rotatably driven cutterhead for a vegetation cutting apparatus |
February 5, 1991 |
| The invention relates to a rotatably driven cutterhead for a vegetation cutter apparatus. The cutterhead includes a housing in which a spool for the cutting filament is rotatably journalled so as to be rotatable relative to the housing. Switching stops are provided which coact with the |
| 4979416 |
Cutting link for a saw chain |
December 25, 1990 |
| The invention is directed to a cutting link for a saw chain of a motor-driven chain saw. Since the cutting links of the saw chain wear differently at the forward and rearward running surfaces, the cutting link tilts in a direction opposite to the direction of movement of the saw chai |
| 4977708 |
Portable handheld tool machine having a tensioning device for a belt drive |
December 18, 1990 |
| The invention is directed to a tensioning device for a portable handheld tool machine such as a grinding machine or cutting and grinding machine. Such machines have an arm which includes two component sections axially displaceable toward each other and between which a belt tensioning dev |
| 4976246 |
Fuel-injection pump arrangement for a two-stroke engine of a handheld portable tool |
December 11, 1990 |
| The invention relates to a handheld portable tool driven by a two-stroke engine equipped with a pneumatically actuated injection pump. Injection pumps for two-stroke engines are generally rigidly connected to the engine so that the injection line can be rigid and as short as possible. Th |
| 4970993 |
Portable handheld motor tool having a one-piece fan housing |
November 20, 1990 |
| The invention relates air-cooled combustion engine powered handheld tool. A fan screen has radial struts and tranverse walls which together define windows. The effective intake suction area of the fan is less than the area of the screen. Wood chips and the like are kept out by the size o |
| 4964217 |
Handle for a chain saw |
October 23, 1990 |
| The invention is directed to the handle of a portable handheld tool such as a motor-driven chain saw. The handle is configured as a plastic body homogeneous with its bearing portions. The handle is for the most part hollow and can be configured as a unit to include further functional |
| 4962617 |
Portable handheld power-driven tool |
October 16, 1990 |
| This disclosure is directed to a portable handheld power-driven tool such as a cutoff machine. The cutoff machine includes an engine having a drive shaft. A drive wheel for the work tool is provided at one end of the drive shaft and a fan wheel for moving cooling air to the engine is mou |
| 4961263 |
Guide bar of solid material for the saw chain of a motor chain saw |
October 9, 1990 |
| The invention relates to a guide bar having a main member made of solid material for a motor chain saw. The guide bar has two flat sides and narrow edges defining a saw chain path. A cutout extends through the main member of the guide bar for reducing weight. The openings in the main |
| 4958602 |
Internal combustion engine |
September 25, 1990 |
| The invention relates to internal combustion engines and especially to two-stroke engines for portable handheld work tools such as motor-driven chain saws or the like. Material made of light metal alloys is used in two-stroke engines for portable handheld tools in order to save weight. |
| 4956918 |
Guide bar for the saw chain of a motor-driven chain saw |
September 18, 1990 |
| The invention is directed to a guide bar for the saw chain of a motor-driven chain saw and includes a base body section on which a nose assembly section for the saw chain is releasably attached. The nose assembly section is attached to the base body section by means of a releasable l |
| 4953294 |
Portable handheld tool having a drive shaft rotatably journalled in a protective tube |
September 4, 1990 |
| The invention is directed to a portable handheld tool such as a brushcutter which includes a work tool assembly and a drive motor connected by a drive shaft. The drive shaft is surrounded by a protective tube and is centrally held therein by means of a bearing sleeve unit. The bearing sl |
| 4938660 |
Pump for viscous fluids |
July 3, 1990 |
| The invention is directed to a pump for use as a lubricating oil pump in internal combustion engines of handheld portable tools such as motor-driven chain saws or the like. The pump includes a body forming the stator and a body forming the rotor. These bodies lie coaxial with respect |
| 4932370 |
Fuel injection arrangement |
June 12, 1990 |
| Fuel injection arrangements having pneumatically driven injection pumps utilize the fluctuating crankcase pressure whereby the injection time point is fixed by the system. The injection time point can be fixed so as to depart from the course of the pressure in the crankcase if the cr |
| 4932366 |
Portable handheld motor-driven tool |
June 12, 1990 |
| The invention is directed to handheld portable tools. An air temperature dependent cooling throttle flap controls the amount of cooling air passing over an air cooled engine. The arrangement of the throttle flap in an annular extension expels air in a manner not to annoy the operator. |
| 4919091 |
Ignition switch arrangement for an internal combustion engine having an electrical ignition syst |
April 24, 1990 |
| The invention relates to an ignition switch arrangement for an internal combustion engine having electrical ignition. Engines for handheld portable tools are for the most part equipped with magneto ignition and are switched by short circuiting the ignition coil for bringing the engine |
| 4911050 |
Saw chain |
March 27, 1990 |
| The invention is directed to a saw chain for a motor-driven saw such as a handheld, portable motor-driven chain saw. The motor-driven saw has a guide bar defining a track for accommodating and guiding the saw chain in a predetermined direction of movement. The saw chain includes a plural |
| 4903655 |
Membrane fuel pump with pulse dampener |
February 27, 1990 |
| The invention is directed to a membrane fuel pump for an internal combustion engine equipped with a membrane carburetor. The engine is that of a working apparatus and especially a handheld portable tool such as a motor-driven chain saw or the like. The membrane pump includes a drive |
| 4893410 |
Cutterhead for a vegetation cutter |
January 16, 1990 |
| The invention is directed to a cutterhead for attachment to a vegetation cutting apparatus. The cutterhead has a housing with a spool on which a coil of cutting filament is wound. The cutting filament is paid out in incremental lengths when its ends effective for cutting are worn. This i |
| 4890595 |
Motor-driven chain saw having an arrangement for preheating fresh intake air |
January 2, 1990 |
| The invention is directed to an arrangement for heating the intake air of the carburetor of the engine of a handheld portable tool such as a chain saw. The fresh air entering the air intake line is quickly and adequately heated and directed to the carburetor as intake air without the dan |
| 4876999 |
Two-stroke engine |
October 31, 1989 |
| The invention relates to a two-stroke engine having an overflow channel through which an air/fuel mixture is supplied. The overflow channel is provided with a vaporization chamber having a hot wall against which fuel is injected and vaporized. The vaporized fuel is stored in the vapo |
| 4872587 |
Closure for a fuel tank |
October 10, 1989 |
| A threaded closure is provided with a receiving opening 16 in the part thereof which projects into a fuel tank. The end of a limp connecting part 13 is rotatably mounted in this recess and is however axially fixed. The threaded closure prevents damage to the sealing surface and prevents |
| 4867270 |
Exhaust gas muffler for a two-stroke engine |
September 19, 1989 |
| The invention relates to an exhaust gas muffler for a two-stroke engine of a portable handheld tool such as a chain saw. The exhaust gas muffler includes a catalyzer wherein high exhaust gas temperatures are developed because of the exothermal reaction which takes place therein. The |
| 4864728 |
Brushcutter |
September 12, 1989 |
| A brushcutter has a guide wand with a drive head rotatably mounted thereon. A motor rotatably drives the drive head and a cutting head for cutting vegetation is mounted on the drive head and defines a rotational plane. A protective arrangement partially overlaps the cutting tool in the r |
| 4846119 |
Fuel injection pump for a two-stroke engine |
July 11, 1989 |
| A pneumatically operated fuel injection pump has a work chamber which is partitioned by a membrane into a pulse chamber and a return chamber. The pulse chamber is charged with crankcase pressure from a two-stroke engine while a counterforce is built up in the return chamber which varies |
| 4819779 |
Centrifugal clutch |
April 11, 1989 |
| A centrifugal clutch for use especially in a motor-driven chain saw. The clutch includes a carrier which is provided for attachment to a drive shaft and on which radially moveable centrifugal weights are mounted. The weights can move radially outwardly under centrifugal force and counter |
