| Patent Number |
Title Of Patent |
Date Issued |
| D389706 |
Control handle |
January 27, 1998 |
|
| D361336 |
Engine for a trimmer |
August 15, 1995 |
|
| D276662 |
Portable pneumatic sweeper |
December 4, 1984 |
|
| 5774993 |
Hand-held working tool, especially trimmer or edge cutter |
July 7, 1998 |
| A hand-held working tool has a motor housing and a motor with output shaft positioned in the motor housing. A clutch housing is connected to the motor housing. A centrifugal clutch is positioned in the clutch housing. A drive shaft with a first and a second end is provided. The centrifug |
| 5771583 |
Cutter blade support for a hedge trimmer |
June 30, 1998 |
| The invention is directed to a cutter blade support for a pair of knives of a hedge trimmer. The cutter blade support includes first and second bars conjointly defining a space therebetween. First and second cutter blades are arranged in the space and define respective sets of apertures |
| 5704257 |
Securing mechanism for securing a drive shaft of a rotating tool member of a working tool |
January 6, 1998 |
| A securing mechanism for securing a drive shaft of a rotating tool member of a working tool against rotation includes a securing member fixedly connected to the drive shaft. The securing member has at least one engagement opening. A lock bolt for engaging the at least one engagement |
| 5693264 |
Portable working tool with internal combustion engine |
December 2, 1997 |
| A portable working tool such as a motor chainsaw has a housing and an internal combustion engine with a carburetor contained in the housing. A throttle valve is connected to the carburetor. A choke flap is connected to the carburetor upstream of the throttle valve in the flow direction o |
| 5682680 |
Guide bar for a saw chain |
November 4, 1997 |
| A guide bar for a saw chain has a sort-shaped base member made of solid material, having a front end with a deflection area for a saw chain and a rear end for connecting the guide bar drive unit. The base member has outer lateral surface extending from the front end to the rear end and a |
| 5666733 |
Guide bar for a motor chainsaw |
September 16, 1997 |
| A guide bar for a saw chain of a motor chainsaw has two side plates having a longitudinal extension. At least one longitudinal stay for fixedly connecting the side plates to one another is provided such that the side plates are positioned substantially congruent and parallel to one anoth |
| 5634273 |
Guide bar having an oil-feed channel |
June 3, 1997 |
| The invention relates to a guide bar (9) for a saw chain (10) having a sword-shaped base body (16). A peripheral guide groove (11) is introduced into the periphery (17) of the base body (16). an oil-feed channel (22) is provided which opens into the guide groove (11) in the region of the |
| 5560345 |
Start-assist device on a membrane carburetor |
October 1, 1996 |
| The invention is directed to a start-assist device on a membrane carburetor of an internal combustion engine in a motor-driven chain saw which is to be started manually. The carburetor includes a control chamber delimited by a control membrane. The control chamber is supplied with fuel f |
| 5544544 |
Throttle trigger device for an internal combustion engine of a working tool |
August 13, 1996 |
| A throttle trigger device for an internal combustion engine of a working tool has a throttle trigger connected to the handle of the working tool so as to be pivotable about a pivot axis. A throttle trigger lock is connected to the handle of the working tool so as to be pivotable about a |
| 5542405 |
Membrane carburetor |
August 6, 1996 |
| The invention relates to a membrane carburetor for an engine of a motor-driven chain saw. The membrane carburetor has a fuel-filled control chamber delimited by a control membrane. A throttle flap is mounted in an intake channel and a main nozzle opens into the intake channel upstream of |
| 5503649 |
Air filter for an internal combustion engine |
April 2, 1996 |
| An air filter for an internal combustion engine has a housing with an interior chamber. The housing has housing walls at least one of which is in the form of a filter element. One of the housing walls has a suction opening for connecting the air filter to a suction channel of the com |
| 5477841 |
Magnetic ignition system |
December 26, 1995 |
| A magnetic ignition system for an internal combustion engine has a magnet wheel revolving with the crankshaft of the engine. At least one permanent magnet rotates with the magnet wheel. A stationary armature with a coil is provided. The permanent magnet induces a voltage in the coil, and |
| 5441673 |
Carburetor for an internal combustion engine |
August 15, 1995 |
| The invention is directed to a carburetor for an internal combustion engine and includes an intake channel having a throttle flap mounted therein. Fuel passes from a fuel-filled control chamber via channels to main and idle nozzles through which the fuel enters the intake channel. The ma |
| 5407012 |
Portable handheld edge cutter |
April 18, 1995 |
| The invention is directed to a portable handheld edge cutter and especially an edge cutter for maintaining the edges of a lawn. The edge cutter includes a drive motor and a rotating knife as well as a drive shaft between the motor and the knife. The knife end of the drive shaft is mo |
| 5386756 |
Saw chain for a motor-driven chain saw |
February 7, 1995 |
| The invention relates 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 chain saw is further equipped with a device for supply |
| 5375463 |
Arrangement for assisting an operator to adjust a carburetor |
December 27, 1994 |
| The invention is directed to an arrangement for assisting an operator to adjust a carburetor. The arrangement has a display for the setting of the carburetor of an internal combustion engine such as a two-stroke engine. An actual signal proportional to the carburetor setting is compared |
| 5365893 |
Fuel-injection arrangement for an internal combustion engine |
November 22, 1994 |
| The invention is directed to a fuel-injection arrangement for a two-stroke engine in a portable handheld work apparatus such as a motor-driven chain saw or the like. Fuel is drawn by suction from a fuel tank by a fuel-feed pump and is made available at the suction connection of an inject |
| 5359777 |
Cutterhead for a string trimmer |
November 1, 1994 |
| A cutterhead for a string trimmer having a rotatable drive shaft is adapted to hold and meter a cutting filament during operational use thereof. The cutterhead includes a disc-like carrier fixedly connected to one end of the drive shaft to permit the carrier to rotate about a rotational |
| 5345686 |
Cutting arrangement for a motor-driven chain saw |
September 13, 1994 |
| The invention is directed to a cutting arrangement for a motor-driven chain saw and is configured as a preassembled component which includes a guide bar having a saw chain and sprocket drive wheel. A tensioning device is integrated into the guide bar for holding the parts of the componen |
| 5337710 |
Injection arrangement for a two-stroke engine |
August 16, 1994 |
| A fuel-injection arrangement and a two-stroke engine define a combination for a portable handheld work apparatus such as a motor-driven chain saw or the like. The combination includes a fuel-feed pump for pumping fuel from a fuel tank and a fuel-injection pump for supplying the fuel for |
| 5315075 |
Exhaust gas muffler for an internal combustion engine |
May 24, 1994 |
| The invention is directed to an exhaust gas muffler for an internal combustion engine such as a two-stroke engine for portable handheld tools such as a motor-driven chain saw. The engine includes a cylinder and a piston conjointly defining a combustion chamber wherein combustion gases |
| 5287832 |
Starting device for an internal combustion engine |
February 22, 1994 |
| The invention is directed to a starting device for manually starting an internal combustion engine and especially a two-stroke engine. The starting device comprises essentially a clutch drum which is actuated by a pull rope for imparting rotation to a catch which coacts with a clutch |
| 5283013 |
Membrane carburetor |
February 1, 1994 |
| The invention is directed to a membrane carburetor for an internal combustion engine such as a two-stroke engine having an intake for drawing the mixture in by suction. The membrane carburetor has a venturi section wherein the mixture is formed. A main nozzle opening opens forward of a |
| 5281086 |
Pump for viscous fluids |
January 25, 1994 |
| The invention is directed to a pump for pumping a viscous fluid. The pump includes a stator body and a rotor body rotatably mounted in the stator body so as to be coaxial therewith. The stator body has a wall structure having a spiral slot formed therein which communicates with a suction |
| 5272813 |
Portable handheld work apparatus |
December 28, 1993 |
| The invention is directed to a portable handheld work apparatus such as a motor-driven chain saw. The work apparatus includes a housing having a forward end wall, a rearward end wall defining a plane and a top wall extending between the end walls. A handle is mounted on the top wall for |
| 5269265 |
Cooling-air blower having a combustion-air channel which taps a component air flow from a coolin |
December 14, 1993 |
| The invention is directed to a cooling-air blower for an internal combustion engine including a two-stroke engine of a portable handheld work apparatus. Cooling air is guided by a cooling-air channel to an internal combustion engine and a combustion-air channel conducts air to the in |
| 5267540 |
Pull-rope starter for an internal combustion engine |
December 7, 1993 |
| The invention is directed to a pull-rope starter for an internal combustion engine of a portable handheld work apparatus such as a motor-driven chain saw, cutoff machine or the like. The work apparatus has a housing defining cooling air openings for conducting cooling air and the pull-ro |
| 5243764 |
Motor-driven chain saw |
September 14, 1993 |
| The invention is directed to a motor-driven chain saw having a housing and a drive motor mounted in the housing for driving a sprocket wheel. The sprocket wheel, in turn, drives a saw chain guided around the periphery of a guide bar. The flat guide bar projects forwardly in the longitudi |
| 5233945 |
Portable handheld work apparatus |
August 10, 1993 |
| The invention relates to a portable handheld work apparatus such as a motor-driven chain saw having an internal combustion engine, a fuel tank and an apparatus housing. The engine has a crankcase and at least one cylinder. The fuel tank is attached to the crankcase at a distance by m |
| 5220774 |
Cutting filament for a vegetation cutter |
June 22, 1993 |
| The invention is directed to a cutting filament for a vegetation cutter. The vegetation cutter includes a drive motor which sets the cutting filament in motion thereby producing noise. The cutting filament extends substantially radially outwardly because of the centrifugal force. The |
| 5184403 |
Motor-driven chain saw having a lubricating oil pump |
February 9, 1993 |
| The invention is directed to a motor-driven chain saw having a drive motor which drives a saw chain via a sprocket with the saw chain running around the periphery of the cutter bar in a guide groove formed in this periphery. A brake device is provided to bring the saw chain to standstill |
| 5152631 |
Positive-engaging coupling for a portable handheld tool |
October 6, 1992 |
| The invention is directed to a positive-engaging coupling between a drive part and a driven part. The positive-engaging coupling includes an insert portion defining a first noncircular cross section and formed on the driven part. The drive part defines a receptacle for accommodating the |
| 5102436 |
Prefilter for an air filter of an internal combustion engine |
April 7, 1992 |
| A prefilter for an air main filter of an internal combustion engine such as a two-stroke engine is configured as a filter ring with the engine being especially a two-stroke engine in a handheld work tool. The filter ring defines a flow directed essentially radially inward and the prefilt |
| 5080379 |
Muffler having a sheet-steel seal |
January 14, 1992 |
| The invention is directed to a seal arranged between two housing parts of a muffler. The seal is configured essentially as a frame and made of sheet steel and has at least two layers. The first layer is defined by the frame itself and the second layer is defined by lugs which are folded |
| 5065476 |
Handle arrangement for a handheld portable tool |
November 19, 1991 |
| The invention is directed to a rearward handle arrangement for a handheld portable tool defining a horizontal axis and having a motor housing and a forward handle fixedly attached to the housing so as to permit two-handed operation of the tool by an operator. The rearward handle arrangem |
| 5046566 |
Portable handheld tool having a handle arrangement decoupled by antivibration elements |
September 10, 1991 |
| The invention relates to a portable handheld tool such as a motor chain saw, cutoff machine or the like having a motor arranged in a housing. The motor drives a work tool via a drive pinion. The portable, handheld tool is provided with a handle arrangement for holding and guiding the too |
| 5042626 |
Arrangement for actuating a braking device for bringing a motor-driven work tool of a work appar |
August 27, 1991 |
| The invention is directed to an arrangement for actuating a braking device for bringing a motor-driven work tool of a work apparatus to standstill. The braking device is actuated by a brake lever and the brake lever is connected to a pivotably journalled throttle lever via a first actuat |
| 5018492 |
Work apparatus having one handle for one-handed operation |
May 28, 1991 |
| The invention is directed to a work apparatus such as a motor-driven chain saw or the like and is especially directed to a one-hand chain saw. The apparatus has a housing for an engine for driving the work tool and an air/fuel-mixture is metered to the engine. The chain saw includes one |
| 4983330 |
Membrane carburetor having a coupling arrangement for coupling the choke and throttle flaps to e |
January 8, 1991 |
| The invention is directed to a membrane carburetor having an intake channel and a choke flap and throttle flap movably mounted in this channel one behind the other when viewed in the direction of flow through the channel. The choke flap is arranged in the intake channel for enriching the |
| 4979477 |
Ignition circuit for a two-stroke engine |
December 25, 1990 |
| The invention is directed to an ignition circuit for an internal combustion engine such as a two-stroke engine of a handheld, portable tool such as a motor-driven chain saw or the like. The engine has a cylinder and a piston conjointly defining a combustion chamber and a crankshaft conne |
| 4978478 |
Control membrane for a carburetor |
December 18, 1990 |
| The invention is directed to a control membrane of a carburetor including a carburetor chamber containing fuel. The control membrane defines a wall of this chamber and has a reinforcement portion in the center region thereof. This reinforcement portion transmits the membrane stroke to a |
| 4949818 |
Brake band for bringing the saw chain of a motor-driven chain saw to standstill |
August 21, 1990 |
| The invention is directed to a brake band for bringing the saw chain of a chain saw to standstill. Chain saws include safety devices which bring the saw chain to standstill by applying a brake band to a brake drum. These safety devices effect numerous applications of the brake band to th |
| 4934052 |
Saw chain for a motor-driven chain saw |
June 19, 1990 |
| The invention is directed to a saw chain for a motor-driven chain saw equipped with a guide bar and for which lubricating oil is continuously supplied during operation. The oil reaches the guide groove of the guide bar and is directed to the pivotal joints of the saw chain. The oil is |
| 4903410 |
Guide bar for a chain saw |
February 27, 1990 |
| A guide bar for a motor-driven chain saw is disclosed wherein the guide bar is provided with a center cutout extending in the longitudinal direction of the bar which is filled out with a bonded fiber material made of plastic and reinforced with long fibers. The guide bar reduces the weig |
| 4890690 |
Exhaust gas muffler for a two-stroke engine |
January 2, 1990 |
| The invention is directed to an exhaust gas muffler for a two-cycle engine, especially for a handheld portable tool, such as a chain saw. In exhaust gas mufflers equipped with a catalyzer, the formation of flame from the fuel-containing exhaust gases exiting from the muffler must be prev |
| 4866846 |
Cutterhead for a vegetation cutter |
September 19, 1989 |
| The cutterhead includes a cutting filament wound on a spool and this cutting filament is adjusted with respect to its effective cutting length in dependence upon the rotational speed of the cutterhead. The switching point for the automatic feed must be precisely matched to the drive spee |
| 4861522 |
Carburetor for an internal combustion engine |
August 29, 1989 |
| Disturbances can occur in handheld portable tools driven by internal combustion engines because the idle-nozzle system and the main-nozzle system influence each other. The carburetor of the invention prevents this disturbing influence and provides a control of the engine which is pro |
