Patents by Inventor Yasuo Etou
Yasuo Etou 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: 9486867Abstract: A chainsaw having improved cutting workability is provided. A chainsaw is used to cut an object to be worked by a saw chain. A chainsaw main body is provided with an electric motor and a sprocket, and a guide bar around which the saw chain is wound is provided on the chainsaw main body. The guide bar is attached to the chainsaw main body by a screw member serving as an attaching member. A load sensor detects whether or not the guide bar is attached to the chainsaw main body. Rotation of the saw chain is prohibited based upon a signal from the load sensor when the guide bar is not attached to the chainsaw main body.Type: GrantFiled: December 25, 2012Date of Patent: November 8, 2016Assignee: HITACHI KOKI CO., LTD.Inventors: Yasuo Etou, Satoru Matsuno, Kouji Sagawa, Miyoji Onose, Yasutaka Shimizu, Ai Nakayama
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Patent number: 9381638Abstract: The present invention provides a power tool that can be used at a position away from the external power source. The power tool includes a housing, a motor, an end tool, a battery pack, and an inverter. The housing has an upper side portion and a lower side portion. The motor is supported by the housing and driven by alternate-current power. The end tool is supported by the housing and rotatably driven by the motor. The battery pack outputs direct-current voltage. The inverter is disposed on the upper side portion and at a position higher than the motor and configured to convert the direct-current voltage outputted from the battery pack into alternate-current voltage and to supply the motor with alternate-current power.Type: GrantFiled: June 6, 2011Date of Patent: July 5, 2016Assignee: Hitachi Koki Co., Ltd.Inventors: Ai Nakayama, Toshihiko Tachibana, Yasuo Etou, Miyoji Onose, Hiroshi Yamaguchi
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Patent number: 9381665Abstract: A chainsaw in which a remaining amount of chain oil to be supplied to a saw chain can be easily checked is provided. In a chainsaw 1 including: a saw chain 6 driven by a motor embedded in a main body; and an oil tank 11 in which the chain oil to be supplied to the saw chain 6 in wood cutting process is stored, an illumination unit (LED 15) is provided in vicinity of the oil tank 11. In this manner, the chain oil of the oil tank 11 positioned on a left side of the LED 15 can be illuminated. This illumination unit is configured to be used also as an illuminating device for illuminating the vicinity of the saw chain 6, that is, an area indicated by dotted lines from 21c to 21d. According to the present invention, in a dark location, the remaining amount of the chain oil can be checked, and besides, a positional relationship among the chainsaw 1 main body, the saw chain 6, and the periphery thereof can be easily visually checked, so that the working efficiency can be improved.Type: GrantFiled: February 12, 2013Date of Patent: July 5, 2016Assignee: HITACHI KOKI CO., LTD.Inventors: Miyoji Onose, Kouji Sagawa, Satoru Matsuno, Yasuo Etou, Ai Nakayama, Yasutaka Shimizu
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Patent number: 9254563Abstract: The present invention provides a power tool that can be used at a position away from the external power source. The power tool includes a housing, a motor, an end tool, a battery pack, and an inverter. The motor is supported by the housing and driven by alternate-current power. The end tool is supported by the housing and rotatably driven by the motor. The battery pack outputs direct-current voltage. The inverter is disposed outside the housing and is configured to convert the direct-current voltage outputted from the battery pack into alternate-current voltage and supplies the motor with alternate-current power.Type: GrantFiled: June 6, 2011Date of Patent: February 9, 2016Assignee: Hitachi Koki Co., Ltd.Inventors: Hiroshi Yamaguchi, Toshihiko Tachibana, Yasuo Etou, Miyoji Onose, Ai Nakayama
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Publication number: 20150321377Abstract: A chainsaw in which a remaining amount of chain oil to be supplied to a saw chain can be easily checked is provided. In a chainsaw 1 including: a saw chain 6 driven by a motor embedded in a main body; and an oil tank 11 in which the chain oil to be supplied to the saw chain 6 in wood cutting process is stored, an illumination unit (LED 15) is provided in vicinity of the oil tank 11. In this manner, the chain oil of the oil tank 11 positioned on a left side of the LED 15 can be illuminated. This illumination unit is configured to be used also as an illuminating device for illuminating the vicinity of the saw chain 6, that is, an area indicated by dotted lines from 21c to 21d. According to the present invention, in a dark location, the remaining amount of the chain oil can be checked, and besides, a positional relationship among the chainsaw 1 main body, the saw chain 6, and the periphery thereof can be easily visually checked, so that the working efficiency can be improved.Type: ApplicationFiled: February 12, 2013Publication date: November 12, 2015Inventors: Miyoji ONOSE, Kouji SAGAWA, Satoru MATSUNO, Yasuo ETOU, Ai NAKAYAMA, Yasutaka SHIMIZU
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Patent number: 9044875Abstract: A chain saw includes: a motor driven by electric power; a housing configured to accommodate the motor; a guide bar attached to the housing; a chain blade wound around the guide bar; a sprocket engaged with the chain blade to drive the chain blade, wherein the chain saw is configured to transmit a driving force of the motor to the sprocket via a clutch mechanism, wherein the chain saw comprises a shut-off switch for detecting an actuation of the clutch mechanism and is configured such that the power supply to the motor is stopped when the actuation of the clutch mechanism is detected by the shut-off switch so as to brake electrically. The electrical brake is provided together with a mechanical brake that is configured to work when a hand guard is rotated.Type: GrantFiled: January 11, 2013Date of Patent: June 2, 2015Assignee: HITACHI KOKI CO., LTD.Inventors: Yasutaka Shimizu, Kouji Sagawa, Satoru Matsuno, Yasuo Etou, Ai Nakayama, Miyoji Onose
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Publication number: 20140345149Abstract: A chainsaw having improved cutting workability is provided. A chainsaw is used to cut an object to be worked by a saw chain. A chainsaw main body is provided with an electric motor and a sprocket, and a guide bar around which the saw chain is wound is provided on the chainsaw main body. The guide bar is attached to the chainsaw main body by a screw member serving as an attaching member. A load sensor detects whether or not the guide bar is attached to the chainsaw main body. Rotation of the saw chain is prohibited based upon a signal from the load sensor when the guide bar is not attached to the chainsaw main body.Type: ApplicationFiled: December 25, 2012Publication date: November 27, 2014Inventors: Yasuo Etou, Satoru Matsuno, Kouji Sagawa, Miyoji Onose, Yasutaka Shimizu, Ai Nakayama
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Publication number: 20130068492Abstract: The present invention provides a power tool that can be used at a position away from the external power source. The power tool includes a housing, a motor, an end tool, a battery pack, and an inverter. The housing has an upper side portion and a lower side portion. The motor is supported by the housing and driven by alternate-current power. The end tool is supported by the housing and rotatably driven by the motor. The battery pack outputs direct-current voltage. The inverter is disposed on the upper side portion and at a position higher than the motor and configured to convert the direct-current voltage outputted from the battery pack into alternate-current voltage and to supply the motor with alternate-current power.Type: ApplicationFiled: June 6, 2011Publication date: March 21, 2013Applicant: Hitachi Koko Co., Ltd.Inventors: Ai Nakayama, Toshihiko Tachibana, Yasuo Etou, Miyoji Onose, Hiroshi Yamaguchi
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Publication number: 20130068493Abstract: The present invention provides a power tool that can be used at a position away from the external power source. The power tool includes a housing, a motor, an end tool, a battery pack, and an inverter. The motor is supported by the housing and driven by alternate-current power. The end tool is supported by the housing and rotatably driven by the motor. The battery pack outputs direct-current voltage. The inverter is disposed outside the housing and is configured to convert the direct-current voltage outputted from the battery pack into alternate-current voltage and supplies the motor with alternate-current power.Type: ApplicationFiled: June 6, 2011Publication date: March 21, 2013Inventors: Hiroshi Yamaguchi, Toshihiko Tachibana, Yasuo Etou, Miyoji Onose, Ai Nakayama
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Publication number: 20120024552Abstract: An electrical power tool includes a motor, a load detecting unit, a trigger switch, and a power supplying unit. The load detecting unit detects a load applied to the motor. The trigger switch receives an instruction. The power supplying unit starts supplying of a driving electrical power to the motor when the trigger switch receives the instruction. The power supplying unit changes an amount of the driving electrical power based on the load detected by the load detecting unit.Type: ApplicationFiled: July 15, 2011Publication date: February 2, 2012Applicant: Hitachi Koki Co., Ltd.Inventors: Yoshikazu Kawano, Nobuhiro Takano, Kazuhiko Funabashi, Kenro Ishimaru, Yasuo Etou, Miyoji Onose
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Patent number: D440850Type: GrantFiled: September 6, 2000Date of Patent: April 24, 2001Assignee: Hitachi Koki Co., Ltd.Inventors: Takashi Ozawa, Yasuo Etou
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Patent number: D496843Type: GrantFiled: February 18, 2004Date of Patent: October 5, 2004Assignee: Hitachi Koki Co., Ltd.Inventors: Nobuhisa Sugawara, Yasuo Etou, Takashi Ueda
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Patent number: D499945Type: GrantFiled: July 17, 2003Date of Patent: December 21, 2004Assignee: Hitachi Koki Co., Ltd.Inventors: Nobuhisa Sugawara, Takashi Ozawa, Yasuo Etou