Patents by Inventor Hisato Osawa
Hisato Osawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9850910Abstract: To enhance responsivity of temperature sensor detecting an engine temperature. A temperature sensor component 40 includes a metal washer 42. The temperature sensor component 40 transfers the engine temperature to a sensor body 46 via the heat transfer washer 42. A cylinder portion 8 of a cylinder block 64 has two bosses 30. The washer 42 of the temperature sensor component 40 is fixed to the boss 30 together with the electronic control unit 20.Type: GrantFiled: April 8, 2016Date of Patent: December 26, 2017Assignee: Yamabiko CorporationInventors: Kosuke Matsumoto, Takuo Yoshizaki, Yuuta Kobayashi, Hisato Osawa
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Patent number: 9769984Abstract: An engine-driven brush cutter (100) equipped with a safety device (42) that includes an acceleration sensor unit (24) attached to a drive unit (4) in an aslant orientation such that a detection axis (DA) of the sensor unit (24) inclines by an angle (?1) relative to the up-and-down direction (V) of the brush cutter (100). This inclined orientation of the detection axis (DA) contributes to lowering the sensitivity of the sensor unit (24) to engine vibration to which the safety device should not be sensitive so much.Type: GrantFiled: May 20, 2010Date of Patent: September 26, 2017Assignee: Yamabiko CorporationInventors: Hisato Osawa, Kazuya Hanada, Tadashi Ishimura, Shunsuke Nakadate
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Publication number: 20170175615Abstract: To balance a “low-temperature scavenging effect” and a “high-temperature scavenging effect.” A scavenging system applicable to a leading-air type two-stroke air-cooled engine has a low-temperature scavenging passage and a high-temperature scavenging passage. The low-temperature scavenging passage has first and second passages and includes scavenging ports at upper end parts thereof. The high-temperature scavenging passage has first and second passages and includes scavenging ports at upper end parts thereof. An air is filled through a piston groove into the passages. The low-temperature scavenging passage has a relatively small capacity. The high-temperature scavenging passage has a relatively large capacity.Type: ApplicationFiled: December 20, 2016Publication date: June 22, 2017Applicant: YAMABIKO CORPORATIONInventors: Takahiro Yamazaki, Hidekazu Tsunoda, Hisato Osawa, Shunsuke Ueda
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Publication number: 20160377035Abstract: To improve the effect of preventing contamination of an element in an air cleaner. An air cleaner includes a first inlet (60) through which air is fed to an intake system air passage and a second inlet (62) through which air is fed to an intake system air-fuel mixture passage. An extended passage (72) leads to the second inlet (62), for example. A passage forming member (70, 204) forming the extended passage (72) is shaped to surround a periphery of the first inlet (60). The passage forming member (70, 204) forms a blown-back fuel diffusion preventing region (74) leading to the first inlet (60).Type: ApplicationFiled: June 22, 2016Publication date: December 29, 2016Applicant: YAMABIKO CORPORATIONInventors: Hisato OSAWA, Takahiro YAMAZAKI, Hidekazu TSUNODA, Yuuta KOBAYASHI
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Publication number: 20160376979Abstract: An amplitude of a pressure fluctuation in a vicinity of a main nozzle of a carburetor (32) is decreased. An air cleaner (30) has a first inlet (60) that feeds air to an intake system air channel, and a second inlet (62) that feeds air to an intake system air-fuel mixture channel. A channel formation member (70) is attached to the second inlet (62). A channel length (L2) of an extension channel (72) formed by the channel formation member (70) is 110 mm or more.Type: ApplicationFiled: June 22, 2016Publication date: December 29, 2016Applicant: YAMABIKO CORPORATIONInventors: Hisato OSAWA, Takahiro YAMAZAKI, Hidekazu TSUNODA, Yuuta KOBAYASHI
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Publication number: 20160298552Abstract: To enhance responsivity of temperature sensor detecting an engine temperature. A temperature sensor component 40 includes a metal washer 42. The temperature sensor component 40 transfers the engine temperature to a sensor body 46 via the heat transfer washer 42. A cylinder portion 8 of a cylinder block 64 has two bosses 30. The washer 42 of the temperature sensor component 40 is fixed to the boss 30 together with the electronic control unit 20.Type: ApplicationFiled: April 8, 2016Publication date: October 13, 2016Applicants: YAMABIKO CORPORATION, WALBRO LLCInventors: Takuo YOSHIZAKI, Kosuke MATSUMOTO, Hisato OSAWA, Yuuta KOBAYASHI, Hiroki OGASAWARA
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Publication number: 20160298551Abstract: To enhance responsivity of temperature sensor detecting an engine temperature. A temperature sensor component 40 includes a metal washer 42. The temperature sensor component 40 transfers the engine temperature to a sensor body 46 via the heat transfer washer 42. A cylinder portion 8 of a cylinder block 64 has two bosses 30. The washer 42 of the temperature sensor component 40 is fixed to the boss 30 together with the electronic control unit 20.Type: ApplicationFiled: April 8, 2016Publication date: October 13, 2016Applicant: YAMABIKO CORPORATIONInventors: Kosuke MATSUMOTO, Takuo YOSHIZAKI, Yuuta KOBAYASHI, Hisato OSAWA
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Publication number: 20160169087Abstract: An amount of air taken into an air leading type two-stroke engine is increased to enhance an engine output, and gas emission characteristic deterioration caused by blow-back is inhibited. An inhibition member 16 is disposed between a choke valve 4 in a full open position and a throttle valve 6 in a full open position. The inhibition member 16 includes, for example, a mesh member like a metal mesh. Mixed fuel containing oil is supplied to the air-fuel mixture channel 14. Numerous pores of the inhibition member 16 (mesh member) are occluded by a membrane of oil components of the mixed fuel. Consequently, entry of a blow-back flow of an air-fuel mixture from the air-fuel mixture channel 14 into the air channel 12 through the numerous pores of the flow inhibition member 16 (mesh member) can be inhibited.Type: ApplicationFiled: December 8, 2015Publication date: June 16, 2016Inventors: Takahiro Yamazaki, Hidekazu Tsunoda, Hisato Osawa, Tomoyoshi Kudo
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Publication number: 20160097344Abstract: The efficiency of charging air to a scavenging channel is enhanced by generating a gas flow in a piston groove simultaneously with the piston groove coming into communication with an air port. A piston groove 8 formed in a peripheral surface of a piston includes a pressure transmission through hole 10, and the pressure transmission through hole 10 consistently communicates with a crankcase. In the course of the piston moving up, upon a pressure in the crankcase becoming negative, the negative pressure in the crankcase affects the piston groove 8through the pressure transmission through hole 10. Consequently, a pressure in the piston groove 8 is released to the crankcase through the pressure transmission through hole 10. Upon the piston moving up and the piston groove 8 being thereby brought into communication with the air port 4a, air enters the piston groove 8 through the air port 4a ((III) of FIG. 1).Type: ApplicationFiled: October 5, 2015Publication date: April 7, 2016Applicant: YAMABIKO CORPORATIONInventors: Takahiro Yamazaki, Hidekazu Tsunoda, Hisato Osawa
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Patent number: 8894735Abstract: The intake device for an engine includes a carburetor section and an air cleaner section. The carburetor section includes a body having an intake passage which has an opening communicating with the air cleaner section and a choke valve being a butterfly valve having a plate-like valve body. The air cleaner section includes an air filter, an air-flow chamber provided between the air filter and the intake passage, and a reverse-flow restriction surface provided within the air-flow chamber. The air cleaner section further includes a plate-like partition extending from a location near an air-cleaner side periphery of the valve body of the choke valve in the full-open position to a location near the reverse-flow restriction surface so as to continue the periphery.Type: GrantFiled: October 12, 2012Date of Patent: November 25, 2014Assignee: Yamabiko CorporationInventors: Takahiro Yamazaki, Ken Shirai, Hisato Osawa, Yuji Numakunai
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Patent number: 8832947Abstract: A top-handle portable working machine includes a grip configuration that makes it easy for a worker to manipulate the implement as intended in order to adapt to tasks in which accuracy, fineness, or an attractive finish is needed. The direction of an axis in which the top grip extends and the direction of a working axis of the implement are inclined relative to each other in a vertical direction so as to intersect at a point to the rear of the housing at angle between 15 and 25°. A detachable grip-position restricting member is attachable to a concave part of the top grip.Type: GrantFiled: May 13, 2013Date of Patent: September 16, 2014Assignee: Yamabiko CorporationInventors: Hisato Osawa, Kazuhiro Yoneyama
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Patent number: 8707568Abstract: A top-handle portable working machine includes a grip configuration that makes it easy for a worker to manipulate the implement as intended in order to adapt to tasks in which accuracy, fineness, or an attractive finish is needed. The direction of an axis in which the top grip extends and the direction of a working axis of the implement are inclined from each other in a vertical direction so as to intersect at a point to the rear of the housing at angle between 15 and 25°.Type: GrantFiled: February 4, 2010Date of Patent: April 29, 2014Assignee: Yamabiko CorporationInventors: Hisato Osawa, Kazuhiro Yoneyama
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Publication number: 20130247389Abstract: A top-handle portable working machine includes a grip configuration that makes it easy for a worker to manipulate the implement as intended in order to adapt to tasks in which accuracy, fineness, or an attractive finish is needed. The direction of an axis in which the top grip extends and the direction of a working axis of the implement are inclined relative to each other in a vertical direction so as to intersect at a point to the rear of the housing at angle between 15 and 25°. A detachable grip-position restricting member is attachable to a concave part of the top grip.Type: ApplicationFiled: May 13, 2013Publication date: September 26, 2013Applicant: Yamabiko CorporationInventors: Hisato Osawa, Kazuhiro Yoneyama
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Patent number: 8468910Abstract: A filler member to be installed in a crankshaft including a crank web includes: an arm member, extending in a diametrical direction of a crank journal, and a weight member extending in a radial direction of the crank journal. The filler member includes: a fitting member, a connecting member mounted on the bodies. The fitting member is fixed to an outer side face of the crank web. The connecting member is mounted on the bodies to stride the arm member on inner side face of the crank web.Type: GrantFiled: December 1, 2011Date of Patent: June 25, 2013Assignee: Yamabiko CorporationInventors: Hisato Osawa, Takahiro Yamazaki, Ken Shirai, Yuji Numakunai
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Patent number: 8397691Abstract: A work apparatus having an internal combustion engine includes a body case (100) that houses the engine and other components of the apparatus and a hood (102) that removably covers a top opening of body case (100). The hood (102) has an inclined pin (104) extending aslant downward toward one end of the hood (102) from a portion near the one end. The body case has an inclined bore (106) for receiving the inclined pin (104). A rear end portion of the hood (102) is locked to the body case (100) by a known lock means. The inclined pin (104) wears an elastic tube (112) on its outer circumference.Type: GrantFiled: September 9, 2009Date of Patent: March 19, 2013Assignee: Yamabiko CorporationInventors: Hisato Osawa, Kosuke Matsumoto
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Publication number: 20120137827Abstract: A filler member to be installed in a crankshaft including a crank web includes: an arm member, extending in a diametrical direction of a crank journal, and a weight member extending in a radial direction of the crank journal. The filler member includes: a fitting member, a connecting member mounted on the bodies. The fitting member is fixed to an outer side face of the crank web. The connecting member is mounted on the bodies to stride the arm member on inner side face of the crank web.Type: ApplicationFiled: December 1, 2011Publication date: June 7, 2012Applicant: YAMABIKO CORPORATIONInventors: Hisato OSAWA, Takahiro YAMAZAKI, Ken SHIRAI, Yuji NUMAKUNAI
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Publication number: 20110030227Abstract: A top-handle portable working machine is provided with a grip configuration that makes it easy for a worker to manipulate the implement as intended in order to adapt to tasks in which accuracy, fineness, or an attractive finish is needed. The direction of an axis in which the top grip extends and the direction of a working axis of the implement are inclined from each other in a vertical direction so as to intersect at a point to the rear of the housing, and the inclination angle ? between the direction of the axis of the top grip and the direction of the working axis of the implement is set in the range of 15 to 25°.Type: ApplicationFiled: February 4, 2010Publication date: February 10, 2011Inventors: Hisato Osawa, Kazuhiro Yoneyama
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Publication number: 20100294616Abstract: An engine-driven brush cutter (100) equipped with a safety device (42) that includes an acceleration sensor unit (24) attached to a drive unit (4) in an aslant orientation such that a detection axis (DA) of the sensor unit (24) inclines by an angle (?1) relative to the up-and-down direction (V) of the brush cutter (100). This inclined orientation of the detection axis (DA) contributes to lowering the sensitivity of the sensor unit (24) to engine vibration to which the safety device should not be sensitive so much.Type: ApplicationFiled: May 20, 2010Publication date: November 25, 2010Applicant: YAMABIKO CORPORATIONInventors: Hisato Osawa, Kazuya Hanada, Tadashi Ishimura, Shunsuke Nakadate
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Publication number: 20100077985Abstract: A work apparatus having an internal combustion engine includes a body case (100) that houses the engine and other components of the apparatus and a hood (102) that removably covers a top opening of body case (100). The hood (102) has an inclined pin (104) extending aslant downward toward one end of the hood (102) from a portion near the one end. The body case has an inclined bore (106) for receiving the inclined pin (104). A rear end portion of the hood (102) is locked to the body case (100) by a known lock means. The inclined pin (104) wears an elastic tube (112) on its outer circumference.Type: ApplicationFiled: September 9, 2009Publication date: April 1, 2010Applicant: Kioritz CorporationInventors: Hisato Osawa, Kosuke Matsumoto