Patents by Inventor Mariko Mizuochi

Mariko Mizuochi 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).

  • Publication number: 20220333346
    Abstract: A site management system manages the positions of workers and work areas of work machines. The workers can recognize the work areas of the work machines at a work site in which the work machines and the workers carry out work. A site management device is connected to a worker terminal carried by a worker and a work machine processor is mounted on a work machine 1. The site management device generates worker information 360 on the basis of a signal transmitted from the worker terminal and generates work machine information 350 based on a signal transmitted from the work machine processor. Work area information 380 including the position and the work area of a work machine is generated on the basis of the pieces of information 350 and 360 and a work area notification signal is transmitted with the work area information to the worker terminal device.
    Type: Application
    Filed: August 28, 2020
    Publication date: October 20, 2022
    Inventors: Mariko MIZUOCHI, Hiroyuki YAMADA, Hiroshi SAKAMOTO
  • Publication number: 20220284809
    Abstract: In a traffic flow control system, communication is performed with a travel control device of a moving body passing through a transportation route and the traffic flow of the transportation route is controlled. The traffic control system includes an entry authority management unit and a communication unit. In a transportation route divided into virtual areas, the entry authority management unit manages entry authority for each area, managing tokens in a number that corresponds to the area, and guiding entry of the moving body to the area by attaching entry authority to a token and delivering the resulting token to the travel control device. The communication unit communicates the entry authority and tokens to the travel control device.
    Type: Application
    Filed: May 15, 2020
    Publication date: September 8, 2022
    Inventors: Keiichi KATSUTA, Junya TAKAHASHI, Takehito OGATA, Wataru TANAKA, Mariko MIZUOCHI, Kentaroh MAKI
  • Patent number: 11414836
    Abstract: Provided is a work machine that, within the limit of not harming dynamic stability, can perform work utilizing the impact generated when a cylinder driving a front work implement collides with a stroke end.
    Type: Grant
    Filed: April 23, 2018
    Date of Patent: August 16, 2022
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Yusuke Suzuki, Hiroshi Sakamoto, Mariko Mizuochi, Hiroaki Tanaka
  • Patent number: 11401696
    Abstract: An operator of a hydraulic excavator and a worker working outside of the hydraulic excavator carry a worker tag that sends a radio-wave signal including a magnetic field ID, a tag ID, and positional information obtained by a GNSS receiving section in case the worker tag receives a magnetic field signal generated by a magnetic field detecting device mounted on the hydraulic excavator. Based on positional information of the hydraulic excavator that is obtained from an GNSS receiving device and positional information of the worker tag, the position of the worker tag is calculated. In case the worker tag is detected in a proximity notification target area, a notification command is generated for notifying the operator of the hydraulic excavator of the detection of the worker tag, and output to a notification device in the cabin of the hydraulic excavator. Thus, a worker who is in proximity to the work machine is accurately detected, and the operator is prevented from being excessively alerted.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: August 2, 2022
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Mariko Mizuochi, Hiroshi Sakamoto, Kazushige Kurokami
  • Patent number: 10777023
    Abstract: In a worker management system comprising a terminal device, a worker detection system, and a site management device, the terminal device transmits a worker signal, which includes terminal GNSS positional information represented by a GNSS coordinate system of the terminal device, to the site management device. The worker detection system transmits worker detected positional information, which indicates a position of the worker detected by a surrounding monitoring sensor mounted on the work machine, to the site management device. The site management device relates the terminal GNSS positional information to the worker detected positional information, and when both information for the same worker is available, it selects a position indicated by the worker detected positional information, and when only the terminal GNSS positional information is available, it selects a position indicated by the terminal GNSS positional information, as a current position of the worker.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: September 15, 2020
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Mariko Mizuochi, Hiroshi Sakamoto
  • Publication number: 20200226849
    Abstract: In a worker management system comprising a terminal device, a worker detection system, and a site management device, the terminal device transmits a worker signal, which includes terminal GNSS positional information represented by a GNSS coordinate system of the terminal device, to the site management device. The worker detection system transmits worker detected positional information, which indicates a position of the worker detected by a surrounding monitoring sensor mounted on the work machine, to the site management device. The site management device relates the terminal GNSS positional information to the worker detected positional information, and when both information for the same worker is available, it selects a position indicated by the worker detected positional information, and when only the terminal GNSS positional information is available, it selects a position indicated by the terminal GNSS positional information, as a current position of the worker.
    Type: Application
    Filed: March 7, 2019
    Publication date: July 16, 2020
    Inventors: Mariko MIZUOCHI, Hiroshi SAKAMOTO
  • Publication number: 20200217049
    Abstract: An operator of a hydraulic excavator and a worker working outside of the hydraulic excavator carry a worker tag that sends a radio-wave signal including a magnetic field ID, a tag ID, and positional information obtained by a GNSS receiving section in case the worker tag receives a magnetic field signal generated by a magnetic field detecting device mounted on the hydraulic excavator. Based on positional information of the hydraulic excavator that is obtained from an GNSS receiving device and positional information of the worker tag, the position of the worker tag is calculated. In case the worker tag is detected in a proximity notification target area, a notification command is generated for notifying the operator of the hydraulic excavator of the detection of the worker tag, and output to a notification device in the cabin of the hydraulic excavator. Thus, a worker who is in proximity to the work machine is accurately detected, and the operator is prevented from being excessively alerted.
    Type: Application
    Filed: December 13, 2018
    Publication date: July 9, 2020
    Inventors: Mariko MIZUOCHI, Hiroshi SAKAMOTO, Kazushige KUROKAMI
  • Publication number: 20200131737
    Abstract: Provided is a work machine that, within the limit of not harming dynamic stability, can perform work utilizing the impact generated when a cylinder driving a front work implement collides with a stroke end.
    Type: Application
    Filed: April 23, 2018
    Publication date: April 30, 2020
    Inventors: Yusuke SUZUKI, Hiroshi SAKAMOTO, Mariko MIZUOCHI, Hiroaki TANAKA
  • Patent number: 10570587
    Abstract: Provided is a controller (50) that includes a mechanical state acquisition section (400) that acquires information regarding a posture and an operation of a hydraulic excavator; a blind angle calculation section (500) that calculates a blind angle area from a seat in a cab (1f) of the hydraulic excavator based on the information indicating the posture and the operation of the hydraulic excavator and acquired by the mechanical state acquisition section (400); and a visibility level determination section (300) that determines a visibility level of an obstacle based on the blind angle area calculated by the blind angle calculation section (500) and a positional relationship calculated by a position relation calculation section (200). Further, a warning level determination section (600) of the controller (50) adjusts a warning level in accordance with the visibility level determined by the visibility level determination section (300).
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: February 25, 2020
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kazushige Kurokami, Hiroshi Sakamoto, Mariko Mizuochi
  • Publication number: 20190352885
    Abstract: Provided is a controller (50) that includes a mechanical state acquisition section (400) that acquires information regarding a posture and an operation of a hydraulic excavator; a blind angle calculation section (500) that calculates a blind angle area from a seat in a cab (1f) of the hydraulic excavator based on the information indicating the posture and the operation of the hydraulic excavator and acquired by the mechanical state acquisition section (400); and a visibility level determination section (300) that determines a visibility level of an obstacle based on the blind angle area calculated by the blind angle calculation section (500) and a positional relationship calculated by a position relation calculation section (200). Further, a warning level determination section (600) of the controller (50) adjusts a warning level in accordance with the visibility level determined by the visibility level determination section (300).
    Type: Application
    Filed: November 2, 2017
    Publication date: November 21, 2019
    Inventors: Kazushige KUROKAMI, Hiroshi SAKAMOTO, Mariko MIZUOCHI
  • Publication number: 20190211532
    Abstract: A construction machine includes: a guidance apparatus having a guidance display section for displaying a target surface for an object to be worked on by a work implement based on predetermined design data with respect to the object to be worked on by the work implement and positional information of the work implement and displaying the positional information of the work implement on a guidance monitor in a cabin of the construction machine; and an obstacle detecting apparatus having an obstacle position acquisition section for acquiring positional information of an obstacle detected around the construction machine. The guidance display section of the guidance apparatus displays the positional information of the obstacle acquired by the obstacle position acquisition section of the obstacle detecting apparatus on the guidance monitor. Thus, while viewing the screen of the guidance apparatus, it is possible to present the operator reliably with real-time information of the obstacle.
    Type: Application
    Filed: September 7, 2017
    Publication date: July 11, 2019
    Inventors: Hiroshi SAKAMOTO, Kazushige KUROKAMI, Youhei TORIYAMA, Mariko MIZUOCHI
  • Patent number: 10041225
    Abstract: A drive control system for a work machine. A gradual stoppage command and an operation speed limitation command are calculated and output. A pilot pressure is corrected such that, upon a stoppage operation of a control lever, a drive actuator is stopped gradually; and the pilot pressure is corrected such that an operation speed of the drive actuator is limited. A supply of the pilot hydraulic fluid to the speed increasing unit is interrupted when a failure of a speed increasing solenoid proportional valve of the speed increasing unit is detected.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: August 7, 2018
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Mariko Mizuochi, Akinori Ishii, Kazuyoshi Hanakawa
  • Patent number: 10024032
    Abstract: The work machine includes a stabilization control calculation unit that calculates and outputs a gradual stoppage command for making a drive actuator stop gradually and an operation speed limitation command for limiting an upper limit operation speed according to the status of stability of the work machine, a stoppage characteristic modification unit that corrects pilot pressure so as to make the drive actuator stop gradually when a stoppage operation is performed on a control lever, and an operation speed limitation unit that corrects the pilot pressure so as to limit the operation speed of the drive actuator.
    Type: Grant
    Filed: June 15, 2016
    Date of Patent: July 17, 2018
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Mariko Mizuochi, Akinori Ishii, Kazuyoshi Hanakawa
  • Patent number: 9879405
    Abstract: To provide a hydraulic driving device configured to smoothly extend a hydraulic cylinder. The present invention includes the open circuit E, the closed circuit A, a control device 57, and a control lever 56a. The open circuit E is provided with a flow passage 202 for connecting an outlet port of the open circuit pump 13 and a head chamber 1a of the boom cylinder 1, a selector valve 44a provided in the flow passage 202, a discharge flow passage 404 for connecting a hydraulic fluid tank 25 and a flow passage 200, and a bleed-off valve 64 provided in the discharge flow passage 404. The control device 57 is configured in such a manner that when a manipulate signal for extending the boom cylinder 1 is input from the control lever 56a, the bleed-off valve 64 is closed, the selector valve 44a is subsequently opened, and the open circuit pump 13 is controlled.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: January 30, 2018
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Teppei Saitoh, Juri Shimizu, Mariko Mizuochi, Kenji Hiraku, Akinori Ishii, Hiromasa Takahashi
  • Patent number: 9845813
    Abstract: There is provided a driving device for a work machine, having a closed hydraulic circuit system for driving cylinders with hydraulic pumps, the driving device making the speed of operation substantially the same in both directions of piston rod extension and contraction.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: December 19, 2017
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Juri Shimizu, Kenji Hiraku, Teppei Saitoh, Mariko Mizuochi, Akinori Ishii
  • Patent number: 9783960
    Abstract: To provide a driving device capable of improving the operability of a plurality of single rod hydraulic cylinders. The present invention takes a construction provided with a closed circuit A in which first and third hydraulic pumps 12, 14 and a boom cylinder 1 are connected through selector valves 43a, 45a in a closed-circuit fashion, a plurality of open circuits E, F provided with second and fourth hydraulic pumps 13, 15 and selector valves 44a, 46a that switch the supply destinations of hydraulic oils flowing out from the second and fourth hydraulic pumps 13, 15, and a connection passage 301 connected to sides of the selector valves 44a, 46a from which sides hydraulic oil flows out, and connected to the closed circuit A.
    Type: Grant
    Filed: September 1, 2014
    Date of Patent: October 10, 2017
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Juri Shimizu, Teppei Saitoh, Mariko Mizuochi, Kenji Hiraku, Akinori Ishii, Hiromasa Takahashi, Takashi Kusama
  • Publication number: 20170284056
    Abstract: A drive control system for a work machine includes: a stabilization control calculation unit (60a) that calculates and outputs a gradual stoppage command and an operation speed limitation command; a stoppage characteristic modification unit (210) that includes a speed increasing unit and corrects a pilot pressure such that, upon a stoppage operation of a control lever, a drive actuator is stopped gradually; an operation speed limitation unit (240) that includes a speed reducing unit and corrects the pilot pressure such that an operation speed of the drive actuator is limited; and a speed increase interruption unit (330) that interrupts, when a failure of a speed increasing solenoid proportional valve of the speed increasing unit is detected, supply of the pilot hydraulic fluid to the speed increasing unit.
    Type: Application
    Filed: March 2, 2017
    Publication date: October 5, 2017
    Inventors: Mariko MIZUOCHI, Akinori ISHII, Kazuyoshi HANAKAWA
  • Patent number: 9683588
    Abstract: A hydraulic closed circuit system using a single rod type hydraulic cylinder prevents the hunting of a flushing valve due to a delay in response of the flushing valve and circuit pressure pulsations, thereby preventing a decrease in operability of the hydraulic cylinder. A single rod type hydraulic cylinder is connected to a hydraulic pump via two hydraulic lines. A flushing valve is connected between the hydraulic lines and a tank; and a control unit is configured to add a predetermined control parameter to a pressure in a lower-pressure hydraulic line of the two hydraulic lines. The magnitude of a pressure in the higher-pressure hydraulic line of the two hydraulic lines is compared with the magnitude of a compensation pressure to which the control parameter has been added, and the flushing valve is switched when the compensation pressure and the higher-pressure hydraulic line pressure are found to be reversed in magnitude.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: June 20, 2017
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Hiroyuki Sadamori, Juri Shimizu, Teppei Saitoh, Kenji Hiraku, Mariko Mizuochi
  • Publication number: 20160369480
    Abstract: The work machine includes a stabilization control calculation unit that calculates and outputs a gradual stoppage command for making a drive actuator stop gradually and an operation speed limitation command for limiting an upper limit operation speed according to the status of stability of the work machine, a stoppage characteristic modification unit that corrects pilot pressure so as to make the drive actuator stop gradually when a stoppage operation is performed on a control lever, and an operation speed limitation unit that corrects the pilot pressure so as to limit the operation speed of the drive actuator.
    Type: Application
    Filed: June 15, 2016
    Publication date: December 22, 2016
    Inventors: Mariko MIZUOCHI, Akinori ISHII, Kazuyoshi HANAKAWA
  • Patent number: 9523631
    Abstract: A load detecting device that can highly accurately detect the magnitude and direction of a load whose direction of action changes regardless of the dimension of a pin is provided. Also, a working machine that is provided with this load detecting device and allows work to be performed safely and highly efficiently is provided. The load detecting device is configured with a pin-type load cell 4 and a load calculating unit 30. The pin-type load cell 4 is provided with three pairs of or three strain detecting units that are placed in the circumferential direction of the pin body 1. The load calculating unit 30 selects, from among the three or more pairs of or three or more strain detecting units, two pairs of or two strain detecting units that are less influenced by a change in the cross-sectional shape of the pin body 1, and calculates a load that acts on the pin body 1 according to an output of these selected strain detecting units.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: December 20, 2016
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Mariko Mizuochi, Akinori Ishii