Patents by Inventor Masayoshi Okumi
Masayoshi Okumi 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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Publication number: 20230286186Abstract: A working machine may include a working part, a body including a motor accommodating part, a fan accommodated in the motor accommodating part and a motor accommodated in the motor accommodating part and configured to drive the working part and the fan. The fan may include a disk plate including a circular opening defined at a center of the disk plate, a plurality of vanes attached to the disk plate, and a cover part. The plurality of vanes may be covered by the disk plate and the cover part in an axial direction.Type: ApplicationFiled: March 6, 2023Publication date: September 14, 2023Applicant: Makita CorporationInventors: Daisuke SUZUKI, Masayoshi Okumi, Hideki Kachi
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Publication number: 20230264337Abstract: An electric working machine may include: an electrical component; a first space in which the electrical component is disposed; a partition wall separating the first space from a second space different from the first space, the partition wall including a first communication opening communicating the first space and the second space; and a first one-way valve disposed at the first communication opening.Type: ApplicationFiled: February 9, 2023Publication date: August 24, 2023Applicant: Makita CorporationInventors: Daisuke SUZUKI, Masayoshi OKUMI
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Patent number: 11641120Abstract: A battery mount device may include a housing to which a battery pack is detachably attached, and a cover attached to the housing so as to cover the battery pack and configured to open and close by rotating around a rotation axis. Force in a direction closing the cover may act on the cover in a state where the battery mount device is placed on a horizontal plane. The battery-mounted device may further comprise a cover holding mechanism capable of holding the cover in an open state. The cover holding mechanism may include a cover holder configured to move, in response to an operation by a user, between a holding position where the cover holder interferes with a rotating motion of the cover and a released position where the cover holder does not interfere with the rotating motion of the cover.Type: GrantFiled: October 9, 2019Date of Patent: May 2, 2023Assignee: MAKITA CORPORATIONInventors: Tomokazu Okuoka, Masayoshi Okumi, Takaaki Kato
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Publication number: 20200119318Abstract: A battery mount device may include a housing to which a battery pack is detachably attached, and a cover attached to the housing so as to cover the battery pack and configured to open and close by rotating around a rotation axis. Force in a direction closing the cover may act on the cover in a state where the battery mount device is placed on a horizontal plane. The battery-mounted device may further comprise a cover holding mechanism capable of holding the cover in an open state. The cover holding mechanism may include a cover holder configured to move, in response to an operation by a user, between a holding position where the cover holder interferes with a rotating motion of the cover and a released position where the cover holder does not interfere with the rotating motion of the cover.Type: ApplicationFiled: October 9, 2019Publication date: April 16, 2020Applicant: MAKITA CORPORATIONInventors: Tomokazu OKUOKA, Masayoshi OKUMI, Takaaki KATO
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Publication number: 20200113317Abstract: A backpack type device may include a body, a shoulder belt configured to be strapped on a shoulder of a user, and a waist belt configured to be wrapped around a waist of the user. The waist belt may be configured to switch between a state in which a lower end of the waist belt is below a lower surface of the body and a state in which the lower end of the waist belt is above the lower surface of the body. The backpack type device may be configured capable of being placed on a horizontal plane with the lower surface of the body in contact with the horizontal plane on which the backpack type device is placed in the state in which the lower end of the waist belt is above the lower surface of the body.Type: ApplicationFiled: October 9, 2019Publication date: April 16, 2020Applicant: MAKITA CORPORATIONInventors: Masayoshi OKUMI, Takaaki KATO
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Publication number: 20170306817Abstract: A muffler for an engine is provided. A muffler (50) according to an embodiment of the present invention includes a box-shaped housing (51), and a partition (56) that divides the inside of the housing (51) into a first chamber (61) and a second chamber (62). The partition (56) includes a main body portion (56a) in the form of a flat plate, and a concave portion (56b) that protrudes toward the second chamber (62). Exhaust gas, having flowed from an inlet (52a) of the housing (51) into the first chamber (61), passed a through hole (57) of the main body portion (56a), and reached one side in the second chamber (62), flows inside the second chamber (62) so as to bypass a second concave portion (56b2) of the concave portion (56b) and then passes the other side in the second chamber (62) to reach an outlet (53a) of the housing (51).Type: ApplicationFiled: February 3, 2017Publication date: October 26, 2017Applicant: MAKITA CORPORATIONInventor: Masayoshi OKUMI
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Patent number: 9364906Abstract: A hand-held power tool includes a motor having a stator and a rotor, the motor being configured to rotate the rotor at a speed of at least 40,000 rpm, an output shaft directly driven by the rotor, a tool accessory shaft configured to support a tool accessory, and a two-stage speed reducing transmission operably connecting the output shaft to the tool accessory shaft. The two-stage speed reducing transmission is configured to drive the tool accessory shaft at a rate less than the rotor speed, for example, at a rate less than or equal to 37.5% of the rotor speed.Type: GrantFiled: January 15, 2014Date of Patent: June 14, 2016Assignee: MAKITA CORPORATIONInventors: Kenji Abe, Masayoshi Okumi, Hidenori Nagasaka, Motohiro Omura, Masaaki Fukumoto, Kenji Shibata, Nobuyasu Furui, Masanori Higashi, Kiyoshi Aoyama
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Patent number: 9278444Abstract: A handheld work machine comprises a main body comprising a prime mover and a handle fixed to the main body and configured to be gripped by a user. The handle is formed by pipe material and at least one reinforcement member is disposed at a longitudinal portion of the handle that configures a part of the handle. The reinforcement member may be formed by pipe material and preferably disposed inside the handle. The longitudinal portion where the reinforcement member is disposed may preferably include a fixed portion of the handle that is fixed to the main body.Type: GrantFiled: April 14, 2011Date of Patent: March 8, 2016Assignee: MAKITA CORPORATIONInventors: Masayoshi Okumi, Masaki Kondo
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Patent number: 9115645Abstract: A handheld engine-driven cutter is provided with a disk blade and a main body that drives the disk blade. The main body comprises a four-stroke engine, an oil supplying opening from which engine oil is supplied, and an oil exhausting opening from which the engine oil is exhausted. In this engine cutter, the oil supplying opening and the oil exhausting opening are both disposed on one side of the main body where one end of a driving axis of the four-stroke engine is located.Type: GrantFiled: February 24, 2011Date of Patent: August 25, 2015Assignee: MAKITA CORPORATIONInventors: Masaki Sugiyama, Tetsuya Hasegawa, Masaki Kondo, Tomonobu Nashimoto, Masayoshi Okumi, Katsumi Tozawa
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Publication number: 20150020391Abstract: A hand-held power tool includes a motor having a stator and a rotor, the motor being configured to rotate the rotor at a speed of at least 40,000 rpm, an output shaft directly driven by the rotor, a tool accessory shaft configured to support a tool accessory, and a two-stage speed reducing transmission operably connecting the output shaft to the tool accessory shaft. The two-stage speed reducing transmission is configured to drive the tool accessory shaft at a rate less than the rotor speed, for example, at a rate less than or equal to 37.5% of the rotor speed.Type: ApplicationFiled: January 15, 2014Publication date: January 22, 2015Applicant: MAKITA CORPORATIONInventors: Kenji ABE, Masayoshi OKUMI, Hidenori NAGASAKA, Motohiro OMURA, Masaaki FUKUMOTO, Kenji SHIBATA, Nobuyasu FURUI, Masanori HIGASHI, Kiyoshi AOYAMA
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Patent number: 8793885Abstract: A handheld engine-driven cutter is provided with a disk blade and a four-stroke engine that drives the disk blade. By employing the four-stroke engine, exhaustion of unburned gas and fuel consumption can be reduced. The engine cutter is further provided with a filter through which air provided to the four-stroke engine passes, a carburetor that mixes fuel and the air that passed through the filter, and a casing that houses the filter and the carburetor. The filter and the carburetor are arranged to align on a straight line along a direction of flow of the air passing through the filter and the carburetor.Type: GrantFiled: February 24, 2011Date of Patent: August 5, 2014Assignee: Makita CorporationInventors: Masaki Sugiyama, Tetsuya Hasegawa, Masaki Kondo, Tomonobu Nashimoto, Masayoshi Okumi, Takashi Miyazaki
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Patent number: 8739418Abstract: A handheld engine-driven cutter is provided with a disk blade and a four-stroke engine that drives the disk blade, a filter through which air provided to the four-stroke engine passes, a carburetor that mixes fuel and the air that passed through the filter, a casing that houses the filter and the carburetor, and a filter bracket intervened between the filter and the carburetor, which guides the air having passed the filter to the carburetor. An oil separator is formed integrally with the filter bracket that protrudes out toward the carburetor.Type: GrantFiled: February 24, 2011Date of Patent: June 3, 2014Assignee: Makita CorporationInventors: Masayoshi Okumi, Masaki Kondo, Tomonobu Nashimoto
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Patent number: 8683706Abstract: A handheld engine-driven cutter is provided with a disk blade and an engine that drives the disk blade, a filter through which air provided to the four-stroke engine passes, a carburetor that mixes fuel and the air that passed through the filter, a casing that houses the filter and the carburetor, at least one operation member that is operated by a user and connected to the carburetor via a link, and a shaft that is connected to the casing and supports the operation member in a swingable manner. A shaft receiving groove that supports the shaft is formed in the casing.Type: GrantFiled: February 24, 2011Date of Patent: April 1, 2014Assignee: Makita CorporationInventors: Masayoshi Okumi, Masaki Kondo, Tomonobu Nashimoto, Katsumi Tozawa
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Patent number: 8595944Abstract: A handheld engine-driven cutter is provided with a disk blade and an engine that drives the disk blade, a filter through which air provided to the four-stroke engine passes, a carburetor that mixes fuel and the air that passed through the filter, a casing that houses the filter and the carburetor, at least one operation member that is operated by a user and connected to the carburetor via a link, and a shaft that is connected to the casing and supports the operation member in a swingable manner. A shaft receiving groove that supports the shaft is formed in the casing.Type: GrantFiled: February 24, 2011Date of Patent: December 3, 2013Assignee: Makita CorporationInventors: Masayoshi Okumi, Masaki Kondo, Tomonobu Nashimoto, Katsumi Tozawa
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Publication number: 20130104704Abstract: A handheld work machine comprises a main body comprising a prime mover and a handle fixed to the main body and configured to be gripped by a user. The handle is formed by pipe material and at least one reinforcement member is disposed at a longitudinal portion of the handle that configures a part of the handle. The reinforcement member may be formed by pipe material and preferably disposed inside the handle. The longitudinal portion where the reinforcement member is disposed may preferably include a fixed portion of the handle that is fixed to the main body.Type: ApplicationFiled: April 14, 2011Publication date: May 2, 2013Applicant: MAKITA CORPORATIONInventors: Masayoshi Okumi, Masaki Kondo
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Publication number: 20110214296Abstract: A handheld engine-driven cutter is provided with a disk blade and a four-stroke engine that drives the disk blade, a filter through which air provided to the four-stroke engine passes, a carburetor that mixes fuel and the air that passed through the filter, a casing that houses the filter and the carburetor, and a filter bracket intervened between the filter and the carburetor, which guides the air having passed the filter to the carburetor. An oil separator is formed integrally with the filter bracket that protrudes out toward the carburetor.Type: ApplicationFiled: February 24, 2011Publication date: September 8, 2011Applicant: MAKITA CORPORATIONInventors: Masayoshi OKUMI, Masaki KONDO, Tomonobu NASHIMOTO
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Publication number: 20110214298Abstract: A handheld engine-driven cutter is provided with a disk blade and a four-stroke engine that drives the disk blade. By employing the four-stroke engine, exhaustion of unburned gas and fuel consumption can be reduced. The engine cutter is further provided with a filter through which air provided to the four-stroke engine passes, a carburetor that mixes fuel and the air that passed through the filter, and a casing that houses the filter and the carburetor. The filter and the carburetor are arranged to align on a straight line along a direction of flow of the air passing through the filter and the carburetor.Type: ApplicationFiled: February 24, 2011Publication date: September 8, 2011Applicant: MAKITA CORPORATIONInventors: Masaki SUGIYAMA, Tetsuya HASEGAWA, Masaki KONDO, Tomonobu NASHIMOTO, Masayoshi OKUMI, Takashi MIYAZAKI
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Publication number: 20110214297Abstract: A handheld engine-driven cutter is provided with a disk blade and a main body that drives the disk blade. The main body comprises a four-stroke engine, an oil supplying opening from which engine oil is supplied, and an oil exhausting opening from which the engine oil is exhausted. In this engine cutter, the oil supplying opening and the oil exhausting opening are both disposed on one side of the main body where one end of a driving axis of the four-stroke engine is located.Type: ApplicationFiled: February 24, 2011Publication date: September 8, 2011Applicant: MAKITA CORPORATIONInventors: Masaki SUGIYAMA, Tetsuya HASEGAWA, Masaki KONDO, Tomonobu NASHIMOTO, Masayoshi OKUMI, Katsumi TOZAWA
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Publication number: 20110214657Abstract: A handheld engine-driven cutter is provided with a disk blade and an engine that drives the disk blade, a filter through which air provided to the four-stroke engine passes, a carburetor that mixes fuel and the air that passed through the filter, a casing that houses the filter and the carburetor, at least one operation member that is operated by a user and connected to the carburetor via a link, and a shaft that is connected to the casing and supports the operation member in a swingable manner. A shaft receiving groove that supports the shaft is formed in the casing.Type: ApplicationFiled: February 24, 2011Publication date: September 8, 2011Applicant: MAKITA CORPORATIONInventors: Masayoshi OKUMI, Masaki KONDO, Tomonobu NASHIMOTO, Katsumi TOZAWA
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Publication number: 20070231625Abstract: The present invention relates to a fuel cell system in which a high-pressure gas supply tube is connected to a gas supply opening of a fuel cell, a gas pressure regulating valve is installed in the middle of the high-pressure gas supply tube, and upstream-side and downstream-side shut-off valves are provided respectively on the upstream side and the downstream side of the gas pressure regulating valve in the high-pressure gas supply tube. The fuel cell system is activated by opening the upstream-side shut-off valve and thereafter opening the downstream-side shut-off valve.Type: ApplicationFiled: May 12, 2005Publication date: October 4, 2007Applicant: Toyota Jidosha Kabushiki KaishaInventor: Masayoshi Okumi