Operating tool with braking unit

FIELD: engines and pumps.

SUBSTANCE: operating tool with operating body is equipped with an internal combustion engine to drive the operating body, with an excess fuel starting device for the engine, a braking unit and a braking unit actuation device. The excess fuel starting device for the engine has at least one starting position and actuated by an operating mode switch (10). Being on, the braking unit locks the operating body, and, when it is off, it unlocks the operating body. The operating tool contains a blocking device (66), which is, being in its blocking position (80), stops the starting position. The braking unit is connected to the blocking device (66) in such a way that, when the braking unit is in the off-position, the blocking device (66) is in the blocking position (80).

EFFECT: possibility of switching on the starting position only in case the braking unit is in the on-position.

15 cl, 25 dwg

 



 

Same patents:

FIELD: engines and pumps.

SUBSTANCE: invention can be used in four-stroke engines used in portable motorised tools. Four-stroke engine (1) includes housing (3) of a cylinder, which has opening (5) of the cylinder, in which piston (6) is located with a possibility of back-and-forth movement. Case (4) in which crank shaft (10) is installed with a possibility of being rotated is attached to housing (3) of the cylinder. Partition wall (43), (44) divides the inner space of case (4) into crank case (41), in which crank shaft (10) is installed and oil chamber (42) containing the oil that serves for lubrication of crank shaft (10). There is connection passage (45) connecting crank case (41) to oil chamber (42) and guiding the oil contained in crank case (41) and dripping under action of gravity force into oil chamber (42) and a supply assembly of oil contained in the oil chamber, which provides oil pumping to crank case (41). If an upward direction is determined as a direction in which piston (6) moves from the lower dead point to the upper dead point, then a cross section of partition wall (43), (44) is actually V-shaped if to look in an axial direction of crank shaft (10) and faces with its apex downwards, and connection passage (45) is made at the apex of the V-shaped cross section. A bush cutter is developed, which contains a four-stroke engine and a motorised tool containing a four-stroke engine.

EFFECT: preservation of reliable oil supply irrespective of location of an engine in an inclined state.

11 cl, 17 dwg

Carburettor unit // 2553481

FIELD: engines and pumps.

SUBSTANCE: invention relates to appliances for carburettors used for drives of hand-held tools. Proposed unit comprises carburettor (9) with inlet channel section (10). Said section accommodates throttle element and air choke element. First coupling element is fixed with throttle element while second coupling element is fixed with air choke element. In compliance with this invention, first and second coupling elements make a locking device which impedes closure of air choke element at idle throttle element.

EFFECT: simplified design, inhibited closure of air choke at idle throttle element.

19 cl, 22 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed engine comprises cylindrical housing with cover and bottom, percussion piston axially spring-loaded and fitted therein, combustion chamber arranged under housing cover, rod end composed of percussion piston second end and bottom, return spring fitted in said rod end and working tool stem extending through the hole on housing bottom outward, vent and bypass channels made in said housing, ignition unit electrically connected with spark plug fitted in housing cover. It differs from known devices in that said housing and piston are made of nonmagnetic material. Besides, this engine includes electronical unit, storage battery, generator, magnet fitted in nonmagnetic main piston, fuel pump, buffer fuel, electrically controlled atomiser and contactless ignition control system.

EFFECT: higher efficiency and reliability.

1 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to hand-held devices driven by ICE. Proposed device comprises housing of engine (200) and ICE (202) with cylinder (204) and crankshaft. It incorporates fan wheel (214) driven by crankshaft to run about axle A. Fan casing (216) surrounds fan wheel (214) to interact therewith. Inlet (224) for air to be combusted is arranged radially outside fan wheel (214) to direct air to ICE (202) and has inlet (226) and channel (228). Inlet (226) has first edge (230) radially abutting on has wheel (214) outer periphery (220). Angle X between first line L1 extending radially from axle A parallel with the main direction of cylinder (204) and radius L2 extending radially from axle A so that to cross said first edge (230), is smaller than 70 degrees, preferably, smaller than 66 degrees and, more preferably, than 62 degrees. Invention covers the versions of hand-held device.

EFFECT: decreased weight.

20 cl, 6 dwg

FIELD: machine building.

SUBSTANCE: invention refers to bearing unit of crankshaft of internal combustion engine. The bearing unit consists of bearing (10) mounted on crankshaft (16) of the internal combustion engine, of seat (11, 15) of the bearing designed for placement of bearing (10) and of system (20) of packing designed for sealing relative to crankshaft (16) and seat (11, 15) of the bearing. At least one part of seat (11) of the bearing has a reinforcing element (12) positioned in the seat of the bearing. Also, surface (13) of at least one part of seat (11) of the bearing adjoining bearing (10) is made out of plastic. There are also claimed the internal combustion engine comprising the said bearing unit and a hand tool with a mechanical drive containing the said internal combustion engine.

EFFECT: improved bearing unit of crankshaft due to bearing unit sealing and optimal installation of bearing and/or bushing of bearing in seat of bearing with decreased allowances, which prevents bearing and/or bushing of bearing rotation in bearing seat; minimised hazard of bearing distortion and bearing and/or bushing of bearing compression in bearing seat under force causing finite destruction of bearing and/or bushing of bearing.

13 cl, 4 dwg

FIELD: mechanical engineering.

SUBSTANCE: invention relates to two stroke internal combustion crankcase compression engine designed for use in hand tools. According to invention, engine has at least one air channel between air intake and upper part, two scavenging channels with scavenging ports directed to side of discharge and located close to exhaust hole of cylinder. Engine has at least one scavenging port pointed to side of intake and located close of intake port of cylinder, delivery to said port being provided by at least one scavenging channel. Air channel and scavenging channels are of such design that such amount of air is fed and held in scavenging channels that nothing but air will get out during following scavenging process. Air intake from which air channel branches if provided with limiting valve controlled by at least one parameter of engine, for instance, under action of throttle valve of carburetor. Scavenging ports(s) pointed to side of intake is (are) arranged to provide beginning of delivering of air-fuel mixture later than scavenging with air through scavenging ports pointed to side of exhaust.

EFFECT: reduced consumption of fuel and discharge of noncombusted fuel with exhaust gases.

16 cl, 5 dwg

The invention relates to two-stroke crankcase of the internal combustion engine with scavenging, in which in the upper part of the transmission channels is added to fresh air for use as a buffer in relation to the mixture of the air/fuel below

FIELD: process engineering.

SUBSTANCE: set of invention relates to woodworking, particularly, to chain saws. Chain saw comprises motor 1 with drive sprocket 2 fitted on motor shaft extension 3. Said sprocket is engaged with clutch 4 of saw shaft 5 running in bearing 6 fitted in fixed housing 7 composed of the flange. Said fixed housing is connected by flange joint 8 with ring 9 with top hole 10 to accommodated branch pipe 11. Ring second end is connected by flange 12 with motor housing. Saw shaft bearing inner bore diameter has ledge 13 to press the bearing against said fixed housing so that bearing OD part extends beyond the fixed housing end part 15. Fixed case 16 of rotary lever 17 is fitted on said OD part. Chain saw drive sprocket 29 with pressure bush is fitted on saw shaft extension. Circular part of rotary lever is arranged on the side of bearing 28 while bearing ID surface is located at cylindrical part 929 of fixed housing small OD. Groove to receive locating ring 30 is made on the side of flange cylindrical part to lock cylindrical support 31 and rotary lever.

EFFECT: higher reliability, simplified design.

2 cl, 3 dwg

Electric tool // 2540240

FIELD: electricity.

SUBSTANCE: invention relates to the manual tools. Electric chain saw (10) comprises a saw chain (16), the main body (12) supporting the saw chain (16), an electric motor (48) installed in the main body (12) to drive the tool (16), the main on-off switch (20) controlled by the operator to actuate the electric motor, power supply circuit (42) coupled electrically to the electric motor (48) in order to supply power to the electric motor (48) when the operator controls the main on-off switch (20) for the purpose of the electric motor (48) supply and a moving element (26) intended to protect the operator's hands and fixed in the main body (12). The electric saw chain (10) contains additionally a detector (46) mounted in the main body (12) in order to detect the moving element (26) and the first switch (60) in the power supply circuit (42) in order to open and close the power supply circuit (42). The first switch (60) is designed to open the power supply circuit (42) when the detector (46) detects movement of the moving element (26).

EFFECT: noise reduction during operation of the electric motor.

13 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: saw chain runs around drive sprocket and long guide. Brushless motor drives saw chain via sprocket. Motor is encased in light metal alloy with good heat conductivity. Said case consists of two parts. Motor is brought in contact with case surface for static cooling.

EFFECT: decreased sizes and weight, higher case tightness.

16 cl, 4 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to portable electrically driven chain saw. Proposed saw encased power supply 1, sawing chain 2 and chain guide 3, as well as saw handle 5. Sawing chain is engaged with drive gear. Power supply is made up of DC brushless motor 4 with electronic control system and rotor. The latter is furnished with permanent magnets. Saw handle is arranged under said motor 4 and said drive gear. In vertical sawing, said handle is arranged perpendicular, or, in fact, perpendicular to lengthwise axis of aforesaid saw guide 3.

EFFECT: ease of use, lower labour input.

12 cl, 5 dwg

FIELD: woodworking industry.

SUBSTANCE: inventions relate to the chain wheel design and method of its production. The chain wheel is moulded by the method of casting many items and is made with side walls distanced from each other and connected by circumferentially set teeth, they are also fitted with outer peripheral sections to support side chain saw links and inner peripheral sections where a splined drive shaft of the chain saw can be fitted to rotate the chain wheel. The above teeth are designed for receiving and gearing with shank ends of the central drive chain saw links and putting the cutting chain of the chain saw in motion. The outer and peripheral sections of the side walls are formed by endless peripheral rings. The side walls and the teeth are combined and form through openings passing through both side walls between the teeth and they are made so that to provide for the preset material weight depending on the square of the outer chain wheel surface and amounting to approximately 4-1 g per square inch of the surface square. The outer and inner support rings and teeth of the chain wheel are formed as highly-stressed critical sections and the connection sections - as not highly-stressed sections of smaller thickness.

EFFECT: ensuring reduction of defective item percentage, amount of the material used, cost and weight of the item.

6 cl, 15 dwg

FIELD: woodworking industry.

SUBSTANCE: inventions relate to the chain wheel design and method of its production. The chain wheel is moulded by the method of casting many items and is made with side walls distanced from each other and connected by circumferentially set teeth, they are also fitted with outer peripheral sections to support side chain saw links and inner peripheral sections where a splined drive shaft of the chain saw can be fitted to rotate the chain wheel. The above teeth are designed for receiving and gearing with shank ends of the central drive chain saw links and putting the cutting chain of the chain saw in motion. The outer and peripheral sections of the side walls are formed by endless peripheral rings. The side walls and the teeth are combined and form through openings passing through both side walls between the teeth and they are made so that to provide for the preset material weight depending on the square of the outer chain wheel surface and amounting to approximately 4-1 g per square inch of the surface square. The outer and inner support rings and teeth of the chain wheel are formed as highly-stressed critical sections and the connection sections - as not highly-stressed sections of smaller thickness.

EFFECT: ensuring reduction of defective item percentage, amount of the material used, cost and weight of the item.

6 cl, 15 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to portable electrically driven chain saw. Proposed saw encased power supply 1, sawing chain 2 and chain guide 3, as well as saw handle 5. Sawing chain is engaged with drive gear. Power supply is made up of DC brushless motor 4 with electronic control system and rotor. The latter is furnished with permanent magnets. Saw handle is arranged under said motor 4 and said drive gear. In vertical sawing, said handle is arranged perpendicular, or, in fact, perpendicular to lengthwise axis of aforesaid saw guide 3.

EFFECT: ease of use, lower labour input.

12 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: saw chain runs around drive sprocket and long guide. Brushless motor drives saw chain via sprocket. Motor is encased in light metal alloy with good heat conductivity. Said case consists of two parts. Motor is brought in contact with case surface for static cooling.

EFFECT: decreased sizes and weight, higher case tightness.

16 cl, 4 dwg

Electric tool // 2540240

FIELD: electricity.

SUBSTANCE: invention relates to the manual tools. Electric chain saw (10) comprises a saw chain (16), the main body (12) supporting the saw chain (16), an electric motor (48) installed in the main body (12) to drive the tool (16), the main on-off switch (20) controlled by the operator to actuate the electric motor, power supply circuit (42) coupled electrically to the electric motor (48) in order to supply power to the electric motor (48) when the operator controls the main on-off switch (20) for the purpose of the electric motor (48) supply and a moving element (26) intended to protect the operator's hands and fixed in the main body (12). The electric saw chain (10) contains additionally a detector (46) mounted in the main body (12) in order to detect the moving element (26) and the first switch (60) in the power supply circuit (42) in order to open and close the power supply circuit (42). The first switch (60) is designed to open the power supply circuit (42) when the detector (46) detects movement of the moving element (26).

EFFECT: noise reduction during operation of the electric motor.

13 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: set of invention relates to woodworking, particularly, to chain saws. Chain saw comprises motor 1 with drive sprocket 2 fitted on motor shaft extension 3. Said sprocket is engaged with clutch 4 of saw shaft 5 running in bearing 6 fitted in fixed housing 7 composed of the flange. Said fixed housing is connected by flange joint 8 with ring 9 with top hole 10 to accommodated branch pipe 11. Ring second end is connected by flange 12 with motor housing. Saw shaft bearing inner bore diameter has ledge 13 to press the bearing against said fixed housing so that bearing OD part extends beyond the fixed housing end part 15. Fixed case 16 of rotary lever 17 is fitted on said OD part. Chain saw drive sprocket 29 with pressure bush is fitted on saw shaft extension. Circular part of rotary lever is arranged on the side of bearing 28 while bearing ID surface is located at cylindrical part 929 of fixed housing small OD. Groove to receive locating ring 30 is made on the side of flange cylindrical part to lock cylindrical support 31 and rotary lever.

EFFECT: higher reliability, simplified design.

2 cl, 3 dwg

FIELD: wood industry.

SUBSTANCE: lubrication oil circuit is supplied to the saw chain by the supply pump. Pump drive comprises a first driving wheel associated with a supply pump and a second driving wheel associated with the sprocket. A second drive wheel is made to the actuator element which has a connecting portion, carrying drive connection with a form fit between the element and the drive sprocket. The connecting portion has grippers that match made in the chain sprocket gripping surfaces. The saw is adapted to replace the first sprocket to the first geometric characteristics of the second sprocket to the second geometric characteristics. At the connecting portion of the drive element, the first few grippers that correspond to the first chain sprocket, and a plurality of second jaws, which correspond to a second chain sprocket, are formed. The connecting portion of the first or second gripper adjacent to a respective first or second gripping surfaces of the first or second sprocket.

EFFECT: simplified blade design.

16 cl, 13 dwg

FIELD: engines and pumps.

SUBSTANCE: operating tool with operating body is equipped with an internal combustion engine to drive the operating body, with an excess fuel starting device for the engine, a braking unit and a braking unit actuation device. The excess fuel starting device for the engine has at least one starting position and actuated by an operating mode switch (10). Being on, the braking unit locks the operating body, and, when it is off, it unlocks the operating body. The operating tool contains a blocking device (66), which is, being in its blocking position (80), stops the starting position. The braking unit is connected to the blocking device (66) in such a way that, when the braking unit is in the off-position, the blocking device (66) is in the blocking position (80).

EFFECT: possibility of switching on the starting position only in case the braking unit is in the on-position.

15 cl, 25 dwg

FIELD: machine engineering.

SUBSTANCE: working tool has a working element and an internal combustion engine which drives the working tool, a starting mixture enrichment device for internal combustion engine and a brake mechanism for the working element. The working tool has a mode selector switch to control starting mixture enrichment device. The starting mixture enrichment device in at least one of its positions actuates brake mechanism. The brake mechanism is made in the form of differential band brake. The mode selector switch has two sections which are movable relative to each other. The first section of the mode selector switch affects the differential band brake. The second section of the mode selector switch has a control element affecting an air damper element of the internal combustion engine.

EFFECT: simplification of the tool design.

13 cl, 15 dwg

FIELD: mechanical engineering.

SUBSTANCE: invention relates to two stroke internal combustion crankcase compression engine designed for use in hand tools. According to invention, engine has at least one air channel between air intake and upper part, two scavenging channels with scavenging ports directed to side of discharge and located close to exhaust hole of cylinder. Engine has at least one scavenging port pointed to side of intake and located close of intake port of cylinder, delivery to said port being provided by at least one scavenging channel. Air channel and scavenging channels are of such design that such amount of air is fed and held in scavenging channels that nothing but air will get out during following scavenging process. Air intake from which air channel branches if provided with limiting valve controlled by at least one parameter of engine, for instance, under action of throttle valve of carburetor. Scavenging ports(s) pointed to side of intake is (are) arranged to provide beginning of delivering of air-fuel mixture later than scavenging with air through scavenging ports pointed to side of exhaust.

EFFECT: reduced consumption of fuel and discharge of noncombusted fuel with exhaust gases.

16 cl, 5 dwg

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