Patents by Inventor Manato SHIRAI
Manato SHIRAI 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: 11958726Abstract: A work machine includes: an actuator that extends and retracts a telescopic boom; an electric drive source that is provided in the actuator and drives using power supplied from a power source; an operating unit that operates based on power of the electric drive source; and a joint that has a drive-side element fixed to a first transmission shaft that rotates on the basis of the power of the electric drive source and a driven-side element fixed to a second transmission shaft connected to the operating unit, the joint being able to take a transmission state in which both the drive-side element and the driven-side element rotate and a non-transmission state in which only either the drive-side element or the driven-side element rotates.Type: GrantFiled: April 3, 2020Date of Patent: April 16, 2024Assignee: TADANO LTD.Inventors: Masahide Zushi, Kazu Nagahama, Toshihiko Fukuoka, Manato Shirai
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Patent number: 11926512Abstract: This work machine comprises: a telescoping actuator that moves a first boom with respect to a second boom; an electrical drive source that is disposed in a movable portion of the telescoping actuator; a first biasing mechanism that maintains the connection state between the telescoping actuator and the first boom; a first connection mechanism that switches the connection state between the telescoping actuator and the first boom on the basis of the power of the electrical drive source; a second biasing mechanism that maintains the connection state between the first boom and the second boom; a second connection mechanism that switches the connection state between the first boom and the second boom on the basis of the power of the electrical drive source; and a clutch that discretionally intermittently transmits the power of the electrical drive source to the first connection mechanism and the second connection mechanism.Type: GrantFiled: August 21, 2020Date of Patent: March 12, 2024Assignee: TADANO LTD.Inventors: Manato Shirai, Kazu Nagahama, Masahide Zushi
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Publication number: 20230356986Abstract: This work machine includes: a telescoping actuator that moves a first boom in the telescoping direction with respect to a second boom; an electrical drive source that is disposed in a movable portion of the telescoping actuator; a first connection mechanism that switches a connection state between the telescoping actuator and the first boom on the basis of the power of the electrical drive source; a second connection mechanism that switches a connection state between the first boom and the second boom on the basis of the power of the electrical drive source; and a control device that controls operation of the electrical drive source. The control device executes motor assist processing of operating the electrical drive source when the first fixing pin and/or the second fixing pin is restored by biasing force.Type: ApplicationFiled: August 21, 2020Publication date: November 9, 2023Applicant: TADANO LTD.Inventors: Masahide ZUSHI, Manato SHIRAI, Kazu NAGAHAMA
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Publication number: 20220267120Abstract: The work machine includes: a telescoping actuator that moves a first boom in the telescoping direction with respect to a second boom; an electrical drive source that is disposed in a movable portion of the telescoping actuator; a first connection mechanism that switches a connection state between the telescoping actuator and the first boom on the basis of the power of the electrical drive source; a second connection mechanism that switches a connection state between the first boom and the second boom on the basis of the power of the electrical drive source; and a torque limiter that is disposed between the electrical drive source and the first connection mechanism or the second connection mechanism, the torque limiter maintaining, at a predetermined value or less, a load acting on a mechanical element constituting a power transmission path from the electrical drive source.Type: ApplicationFiled: August 21, 2020Publication date: August 25, 2022Applicant: TADANO LTD.Inventors: Manato SHIRAI, Kazu NAGAHAMA, Masahide ZUSHI
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Publication number: 20220212904Abstract: This work machine comprises: a telescoping actuator that moves a first boom with respect to a second boom; an electrical drive source that is disposed in a movable portion of the telescoping actuator; a first biasing mechanism that maintains the connection state between the telescoping actuator and the first boom; a first connection mechanism that switches the connection state between the telescoping actuator and the first boom on the basis of the power of the electrical drive source; a second biasing mechanism that maintains the connection state between the first boom and the second boom; a second connection mechanism that switches the connection state between the first boom and the second boom on the basis of the power of the electrical drive source; and a clutch that discretionally intermittently transmits the power of the electrical drive source to the first connection mechanism and the second connection mechanism.Type: ApplicationFiled: August 21, 2020Publication date: July 7, 2022Applicant: TADANO LTD.Inventors: Manato SHIRAI, Kazu NAGAHAMA, Masahide ZUSHI
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Publication number: 20220169484Abstract: This work machine includes: an actuator that extends and retracts a telescopic boom; an electric drive source that is provided in the actuator and drives using power supplied from a power source; an operating unit that operates based on power of the electric drive source; an electric circuit capable of switching between a drive state in which a supply of power from the power source to the electric drive source is allowed to drive the electric drive source, and a braking state in which the supply of power from the power source to the electric drive source stops to generate a braking force to be applied to the electric drive source; and a control unit that controls the switching between the drive state and the braking state.Type: ApplicationFiled: April 3, 2020Publication date: June 2, 2022Applicant: TADANO LTD.Inventors: Masahide ZUSHI, Kazu NAGAHAMA, Toshihiko FUKUOKA, Manato SHIRAI
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Publication number: 20220169485Abstract: A work machine includes: an actuator that extends and retracts a telescopic boom; an electric drive source that is provided in the actuator and drives using power supplied from a power source; an operating unit that operates based on power of the electric drive source; and a joint that has a drive-side element fixed to a first transmission shaft that rotates on the basis of the power of the electric drive source and a driven-side element fixed to a second transmission shaft connected to the operating unit, the joint being able to take a transmission state in which both the drive-side element and the driven-side element rotate and a non-transmission state in which only either the drive-side element or the driven-side element rotates.Type: ApplicationFiled: April 3, 2020Publication date: June 2, 2022Applicant: TADANO LTD.Inventors: Masahide ZUSHI, Kazu NAGAHAMA, Toshihiko FUKUOKA, Manato SHIRAI