Patents by Inventor Shinichi Sakuma
Shinichi Sakuma 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: 20220390078Abstract: Provided are an electric device and an electric device system. The electric device is provided with a battery pack attachment part, main LEDs, and a sub-LED. The main LEDs are lit by electric power from a battery pack. The sub-LED illuminates the battery pack attached to the battery pack attachment part or the battery pack attachment part. The sub-LED is lit when the voltage or capacity of the battery pack is below a predetermined value. The sub-LED is lit by electric power from a power supply part different from the battery pack.Type: ApplicationFiled: October 30, 2020Publication date: December 8, 2022Applicant: Koki Holdings Co., Ltd.Inventors: Satoshi TACHI, Shinichi SAKUMA
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Patent number: 11020846Abstract: Provided is a work tool that can work suitably in cooperation with an attachment device connected to a main body of the work tool to enhance work efficiency. The work tool includes a main body 2, and a control circuit 71 configured to provide control over the main body 2. The main body 2 includes a motor 3, an end-bit mount portion 10 and an end bit 14 as a work part configured to be driven by the motor 3 to perform a work. A dust collector 100 is connectable to the main body 2 to assist the work. The control circuit 71 is configured to detect whether the dust collector 100 is connected to the main body 2 and change the control over the main body 2 based on whether the connection is established or not.Type: GrantFiled: January 27, 2017Date of Patent: June 1, 2021Assignee: Koki Holdings Co., Ltd.Inventors: Yoshikazu Kawano, Tomoaki Sudo, Kenichi Takaada, Shinichi Sakuma
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Patent number: 8382556Abstract: The portable belt grinder 201 comprises; a main body 202 with an electric motor 203 built therein; a drive pulley disposed in the lower portion of the main body 202 and rotationally drivable by the electric motor 203; an idle pulley disposed as the companion to the drive pulley; and, an endless abrasive belt 215 wound between the two pulleys. In the portable belt grinder 201, in the portion of the main body 202 that exists in the vicinity of the abrasive belt 215, there is formed a hole portion 202f which is used to visually confirm the side end edge of the abrasive belt 215 from above. Also, on the upper surface of the main body 202, there is mounted a transparent cover 222 which is used to cover the hole portion 202f.Type: GrantFiled: October 12, 2007Date of Patent: February 26, 2013Assignee: Hitachi Koki Co., Ltd.Inventors: Naoto Yamashiro, Akira Onose, Shinichi Sakuma
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Patent number: 8099873Abstract: An electric-powered cutting machine includes a reciprocable plunger held by and protruding outward from a housing; an operation member capable of being pivoted on the housing; and a blade holding mechanism disposed at a tip end portion of the plunger, the blade holding mechanism causing a blade to be detachably attached to the plunger. The operation member includes an operation portion and an abutting portion, wherein a distance from the operation portion to a rotating fulcrum is longer than a distance from the abutting portion to the rotating fulcrum. The blade holding mechanism is biased and is capable of swinging, and the blade holding mechanism includes a rotating member capable of being pressed against a side of the blade, wherein the abutting portion abuts against the rotating member when the operating member swings, and wherein the blade is detachably attached to the plunger by swinging of the rotating member.Type: GrantFiled: April 23, 2007Date of Patent: January 24, 2012Assignee: Hitachi Koki Co., Ltd.Inventors: Naoya Eto, Shinichi Sakuma
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Publication number: 20100003905Abstract: The portable belt grinder 201 comprises; a main body 202 with an electric motor 203 built therein; a drive pulley disposed in the lower portion of the main body 202 and rotationally drivable by the electric motor 203; an idle pulley disposed as the companion to the drive pulley; and, an endless abrasive belt 215 wound between the two pulleys. In the portable belt grinder 201, in the portion of the main body 202 that exists in the vicinity of the abrasive belt 215, there is formed a hole portion 202f which is used to visually confirm the side end edge of the abrasive belt 215 from above. Also, on the upper surface of the main body 202, there is mounted a transparent cover 222 which is used to cover the hole portion 202f.Type: ApplicationFiled: October 12, 2007Publication date: January 7, 2010Applicant: HITACHI KOKI CO., LTD.Inventors: Naoto Yamashiro, Akira Onose, Shinichi Sakuma
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Publication number: 20070193041Abstract: An electric-powered cutting machine includes: a housing; a plunger held by the housing and protruding outward therefrom, the plunger being driven to reciprocate; an operation member capable of being pivoted on the housing; and a blade holding mechanism disposed at a tip end portion of the plunger, the blade holding mechanism causing a blade to be detachably attached to the plunger, wherein the operation member includes an operation portion and an abutting portion, wherein a distance from the operation portion to a rotating fulcrum is longer than a distance from the abutting portion to the rotating fulcrum, wherein the blade holding mechanism is biased against pressing means and is capable of swinging, and the blade holding mechanism includes a rotating member capable of being pressed against a side of the blade, wherein the abutting portion abuts against the rotating member when the operating member swings, thereby the rotating member swinging against a biasing force of the pressing member, and wherein the blType: ApplicationFiled: April 23, 2007Publication date: August 23, 2007Applicant: HITACHI KOKI CO., LTD.Inventors: Naoya Eto, Shinichi Sakuma
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Patent number: 7216434Abstract: An electric-powered cutting machine includes: an electric motor, a housing for the electric motor; a plunger driven by the electric motor to reciprocate; and a blade holding mechanism. The blade holding mechanism holds a blade at a tip end portion of the plunger. The blade holding mechanism includes: a blade receiving face including a groove, a swinging member and a pressing member. The groove is shaped substantially the same as an attachment portion of the blade. The swinging member has one and other ends and pivoted at a swing fulcrum. The one end has a blade pressing portion capable of being disposed to oppose to the groove. The other end elongates to separate from the plunger. The pressing member presses the one end toward the groove.Type: GrantFiled: April 21, 2003Date of Patent: May 15, 2007Assignee: Hitachi Koki Co., Ltd.Inventors: Naoya Eto, Shinichi Sakuma
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Publication number: 20070071422Abstract: An electric tool having an inexpensive revolution speed control unit, the life of which is long. According to the intended use, the revolution speed of the motor can be changed from a low speed to a high speed and the revolution speed of the motor can be finely set only in the low speed region.Type: ApplicationFiled: September 25, 2006Publication date: March 29, 2007Inventors: Yoshikazu Kawano, Nobuhiro Takano, Teruo Imai, Shinichi Sakuma
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Publication number: 20030196338Abstract: An electric-powered cutting machine includes: an electric motor, a housing for the electric motor; a plunger driven by the electric motor to reciprocate; and a blade holding mechanism. The blade holding mechanism holds a blade at a tip end portion of the plunger. The blade holding mechanism includes: a blade receiving face including a groove, a swinging member and a pressing member. The groove is shaped substantially the same as an attachment portion of the blade. The swinging member has one and other ends and pivoted at a swing fulcrum. The one end has a blade pressing portion capable of being disposed to oppose to the groove. The other end elongates to separate from the plunger. The pressing member presses the one end toward the groove.Type: ApplicationFiled: April 21, 2003Publication date: October 23, 2003Applicant: Hitachi Koki Co., Ltd.Inventors: Naoya Eto, Shinichi Sakuma