Abstract: An engine including first scavenging passages for fluidly connecting between a combustion chamber and a crank chamber through bearings for the crankshaft, second scavenging passages fluidly connecting directly between the combustion chamber and the crank chamber, a suction chamber formed in a side face of a piston. An air-fuel mixture is sucked into the suction chamber and an air is introduced into the crank chamber. During the intake stroke, the air-fuel mixture from the air-fuel mixture passage is introduced into the first scavenging passages through the suction chambers, and the air is introduced into the crank chamber. During the scavenging stroke, before the air-fuel mixture in the first scavenging passages is introduced into the combustion chamber, introduction of the air in the crank chamber into the combustion chamber through the second scavenging passages starts.

Abstract: An engine including first scavenging passages for fluidly connecting between a combustion chamber and a crank chamber through bearings for the crankshaft, second scavenging passages fluidly connecting directly between the combustion chamber and the crank chamber, a suction chamber formed in a side face of a piston. An air-fuel mixture is sucked into the suction chamber and an air is introduced into the crank chamber. During the intake stroke, the air-fuel mixture from the air-fuel mixture passage is introduced into the first scavenging passages through the suction chambers, and the air is introduced into the crank chamber. During the scavenging stroke, before the air-fuel mixture in the first scavenging passages is introduced into the combustion chamber, introduction of the air in the crank chamber into the combustion chamber through the second scavenging passages starts.

Abstract: A two-cycle combustion engine having a two-staged piston, is simple in structure and inexpensive and addresses a undesirable blow-off phenomenon of the air-fuel mixture. The two-cycle combustion engine includes a cylinder block having a two-staged cylinder bore with a reduced diameter bore portion and a large diameter bore portion, and a two-staged piston having a reduced diameter piston portion and a large diameter piston portion. An annular auxiliary chamber is defined between the two-staged cylinder bore and the reduced diameter piston portion. The two-cycle combustion engine also includes an air-fuel mixture passage for introducing the air-fuel mixture into a crank member, an air passage for introducing air into the auxiliary chamber, a scavenge passage for supplying the air-fuel mixture within the crank chamber into a combustion chamber, and injection passages and for injecting the air within the auxiliary chamber into the combustion chamber to counter a press-out issue.

Abstract: A two-cycle combustion engine with a two-staged piston addresses a blow-off phenomenon of an air-fuel mixture. A cylinder block has a two-staged cylinder bore with a reduced diameter bore portion and a large diameter bore portion, and a two-staged piston having a reduced diameter piston portion and a large diameter piston portion. An annular auxiliary chamber is defined between the cylinder bore and the two-staged piston. An air passage introduces air mixed with oil into a crank chamber. An air-fuel mixture passage introduces the air-fuel mixture into the auxiliary chamber. A scavenge air passage supplies the air within the crank chamber into a combustion chamber, and an injection passage injects the air-fuel mixture within the auxiliary chamber into the combustion chamber from an inner peripheral surface of the cylinder block in a direction oriented substantially diagonally upwardly.

Abstract: A self-supporting cable includes a main cable constructed by covering a cable core with an inner cover layer and installing one or more strength members inside the inner cover layer such that they lie on a plane passing through the central axis thereof; a support member; and an outer cover layer formed so as to cover the main cable and the support member while they are arranged in parallel. A support member portion including the support member and a part of the outer cover layer and a main cable portion including the main cable and a part of the outer cover layer are connected by connecting portions, which are also a part of the outer cover layer, in the longitudinal direction thereof. The main cable portion is made longer than the support member portion so that there is an allowance in the length thereof.

Abstract: A hand-held edger capable of suppressing wear of a cover without an increase in the number of parts. The hand-held edger comprises a main rod supported by an operator's hand; a gear case supported at one end portion of the main rod; a rotating blade connected to a gear in the gear case; a power unit mounted to the other end portion of the main rod, for driving the rotating blade via the gear in the gear case; a resin-made cover attached to a flange of the gear case, for covering the rotating blade; and a wheel supported by the cover, and an outer periphery of the flange is coplanar with the periphery of at least the lowermost portion of the cover or diametrically outwardly protruded therefrom.

Abstract: A self-supporting cable includes a main cable constructed by covering a cable core with an inner cover layer and installing one or more strength members inside the inner cover layer such that they lie on a plane passing through the central axis thereof; a support member; and an outer cover layer formed so as to cover the main cable and the support member while they are arranged in parallel. A support member portion including the support member and a part of the outer cover layer and a main cable portion including the main cable and a part of the outer cover layer are connected by connecting portions, which are also a part of the outer cover layer, in the longitudinal direction thereof. The main cable portion is made longer than the support member portion so that there is an allowance in the length thereof.

Abstract: To provide a two-cycle combustion engine having a two-staged piston, which is simple in structure and inexpensive and in which an undesirable blow-off phenomenon of the air-fuel mixture can be avoided effectively, the two-cycle combustion engine includes a cylinder block 1 having a two-staged cylinder bore defined therein and having a reduced diameter bore portion 1a and a large diameter bore portion 1b, and a two-staged piston 10 having a reduced diameter piston portion 10a and a large diameter piston portion 10b and drivingly accommodated within the two-staged cylinder bore. An annular auxiliary chamber 11 is defined between the large diameter bore portion 1b of the two-staged cylinder bore and the reduced diameter piston portion 10a of the two-staged piston.

Abstract: To provide a two-cycle combustion. engine having a two-staged piston, which is simple in structure and inexpensive and in which an undesirable blow-off phenomenon of the air-fuel mixture can be avoided effectively, the two-cycle combustion engine includes a cylinder block 1 having a two-staged cylinder bore defined therein and having a reduced diameter bore portion 1a and a large diameter bore portion 1b, and a two-staged piston 10 having a reduced diameter piston portion 10a and a large diameter piston portion 10b and drivingly accommodated within the two-staged cylinder bore. An annular auxiliary chamber 11 is defined between the two-staged cylinder bore and the reduced diameter piston portion 10a of the two-staged piston.

Abstract: A cutting blade cover for a brush cutter comprises a central portion (50), a first blade accommodating portion (28), a second blade accommodating portion (29), and a third blade accommodating portion (30). The first, second, and third blade accommodating portions (28, 29, 30) are provided radially from the central portion (50). The first blade accommodating portion (28) includes a first concave portion (31). The second blade accommodating portion (29) includes a second concave portion (36). The third blade accommodating portion (30) includes a third concave portion (40). The first concave portion 31 has an inner shape conforming to an outer shape of the first blade (17) to cover an outer periphery of the first blade (17). The second concave portion (36) has an inner shape conforming to an outer shape of the second blade (18) to cover an outer periphery of the second blade (18).

Abstract: A cutting blade cover(10) is used for protecting a cutting blade(11) having a shank member(16) connected to a driving unit of a reaper and a plate-shaped blade member(17) continuous with the shank member(16) and provided with a cutting portion(18) at a tip portion thereof that is orthogonal to the shank member(16). The cutting blade cover(10) comprises a bag-shaped accommodating portion(24) for accommodating the cutting portion(18) provided at the tip portion of the plate-shaped blade member(17) and a shank retaining portion(25) for retaining the shank member(16).

Abstract: In a conventional impact generator, a grease receives centrifugal force by the rotation of a rotary member, thereby keeping away from surfaces of the rotary member and a weight. Consequently, insufficient lubrication is caused between the weight and a member (for example, a tappet and the like) which comes in contact with the weight. An impact generator D comprises an impregnating member 60 capable of impregnating the grease. The impregnating member 60 is extended from a vicinity of an inner peripheral wall surface 59 of a chamber E1 for accommodating a rotary member 10 and a weight 30 to a position where the impregnating member 60 comes in contact with the weight 30 performing a circular motion.

Abstract: In a conventional impact generator, a great shock is generated when a weight collides with a rotary member, and a rotary shaft of the rotary member and a bearing supporting the rotary shaft receive the great shock. Therefore, it is necessary to employ a bearing having a great load capacity. Furthermore, great vibrations and noises are also generated in the impact generator. A rotary member (10) is rotatably supported by rotary shafts (11) and (12). A weight (30) is movably held by the rotary member (10). A shock absorber (40) for absorbing, by elastic force, a shock generated between the weight (30) and the rotary member (10) is provided between the weight (30) and the rotary member (10).

Abstract: Disclosed is a hand-held edger capable of suppressing wear of a cover without an increase in the number of parts. The hand-held edger comprises: a main rod supported by an operator's hand; a gear case supported at one end portion of the main rod; a rotating blade connected to a gear in the gear case; a power unit mounted to the other end portion of the main rod, for driving the rotating blade via the gear in the gear case; a resin-made cover attached to a flange of the gear case, for covering the rotating blade; and a wheel supported by the cover, and an outer periphery of the flange is coplanar with the periphery of at least the lowermost portion of the cover or diametrically outwardly protruded therefrom.

Abstract: A self-supporting cable includes a main cable constructed by covering a cable core with an inner cover layer and installing one or more strength members inside the inner cover layer such that they lie on a plane passing through the central axis thereof; a support member; and an outer cover layer formed so as to cover the main cable and the support member while they are arranged in parallel. A support member portion including the support member and a part of the outer cover layer and a main cable portion including the main cable and a part of the outer cover layer are connected by connecting portions, which are also a part of the outer cover layer, in the longitudinal direction thereof. The main cable portion is made longer than the support member portion so that there is an allowance in the length thereof.

Abstract: A cutting blade is provided for a reaper which can easily position members to be welded, can reduce a welding distortion, can fully ensure the strength of a shank member and can easily be manufactured. The cutting blade comprises a bar-shaped shank member having axially extending grooves formed on an outer peripheral face of a tip portion and having a base end to be fixed to the reaper, and a plate-shaped blade member having a notch portion formed on a base end, wherein the tip portion of the shank member is fitted in the notch portion of the plate-shaped blade member in such a manner that edge portions of the notch portion are fitted in the grooves, and the fitted tip portion of the shank member is welded to a portion of the plate-shaped blade member which is located around the tip portion.

Abstract: It is an object to provide a power driven portable reaper comprising a guard structure for guarding the portable reaper when the portable reaper is to be temporarily put on the ground or during a reaping work. A power driven portable reaper (A) comprises an engine (20) on a base end thereof, a rod member (22) which is elongated forward from a tip side of the engine(20), an impact force generating unit (24) for converting rotation into reciprocation, and a cutting blade (26) provided in a tipmost portion thereof, a plurality of pipes (1A, 1B, 1C) are provided around the engine (20) so as to surround an outer circumference of the engine (20) in a direction from a tip of the engine (20) to a base end of the engine (20). A guard member is provided to be protruding outward from the reaper in the vicinity of the input force generating unit.

Abstract: A cutting blade cover for a brush cutter comprises a central portion 50, a first blade accommodating portion 28, a second blade accommodating portion 29, and a third blade accommodating portion 30. The first, second, and third blade accommodating portions 28, 29, 30 are provided radially from the central portion 50. The first blade accommodating portion 28 includes a first concave portion 31. The second blade accommodating portion 29 includes a second concave portion 36. The third blade accommodating portion 30 includes a third concave portion 40. The first concave portion 31 has an inner shape conforming to an outer shape of the first blade 17 to cover an outer periphery of the first blade 17. The second concave portion 36 has an inner shape conforming to an outer shape of the second blade 18 to cover an outer periphery of the second blade 18. The third concave portion 40 has an inner shape conforming to an outer shape of the third blade 19 to cover an outer periphery of the third blade 19.