Patents by Inventor Naoki Hagiwara

Naoki Hagiwara 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: 20220170244
    Abstract: A work machine includes a sensor that detects a retroreflective material and other objects in a distinguishable manner, a solenoid valve that restricts an operation signal outputted from an operation device, and a controller configured to control the solenoid valve based on the detection result. The controller controls the solenoid valve based on information concerning whether or not the object detected by the sensor is a retroreflective material and information concerning whether a position of the object detected by the sensor is in a first detection region at least partially including an operation range of a machine body or a second detection region located adjacent to and above the first detection region. This makes it possible to restrain contact between the work machine and an obstacle while restraining a reduction in a detection range due to exclusion of a structure of the work machine from an object of detection.
    Type: Application
    Filed: April 21, 2020
    Publication date: June 2, 2022
    Inventors: Naoki HAGIWARA, Kazuhiko MIZOGUCHI, Keiichirou ANAHARA
  • Patent number: 11313469
    Abstract: A sealing structure includes a sealing device including a first seal lip having a first seal-lip end, and a support ring that supports the first seal lip; and a plurality of members that define an attachment space into which the sealing device is attached, the members including an inner peripheral wall arranged on the inner periphery side of the sealing device, a first end wall arranged on one axial end of the sealing device, and a second end wall arranged on another axial end of the sealing device. The first seal-lip end has a certain amount of interference with the inner peripheral wall and the first end wall so that its radial reaction force radially presses the support ring outward and its axial reaction force presses the support ring toward the second end wall.
    Type: Grant
    Filed: December 14, 2018
    Date of Patent: April 26, 2022
    Assignee: NOK CORPORATION
    Inventor: Naoki Hagiwara
  • Publication number: 20220042285
    Abstract: A hydraulic excavator includes a plurality of cameras that are attached to an upper swing structure and photograph images of surroundings, a controller configured to detect an obstacle present around the upper swing structure on the basis of the camera images, and a speaker that makes a notification that the obstacle is detected when the controller detects the obstacle. When a lock lever is at a lock release position and control levers are maintained in a non-operating state from a time of a start of the controller, the controller permits the notification by the speaker. When the lock lever is at the lock release position and the control levers are changed from an operating state to a non-operating state, the controller permits the notification by the speaker when the non-operating state is continued for a predetermined time or more.
    Type: Application
    Filed: October 10, 2019
    Publication date: February 10, 2022
    Inventors: Saito KATAYAMA, Kazuhiko MIZOGUCHI, Hidenobu TSUKADA, Keiichirou NAKAMURA, Shinichi SASAZAKI, Naoki HAGIWARA
  • Publication number: 20210404556
    Abstract: A sealing device includes a reinforcing ring and an elastic body part formed from an elastic body and attached to the reinforcing ring. The elastic body part includes a seal lip projecting toward one side in a direction of an axis, a secondary lip portion projecting toward another side in the direction of the axis, and an outer peripheral portion covering the reinforcing ring from an outer periphery side. The seal lip projects beyond the reinforcing ring toward the one side, and the secondary lip portion projects beyond the reinforcing ring toward the other side. In the outer peripheral portion, at least one identification part acting as a mark is formed further on the one side or the other side than a middle of the outer peripheral portion.
    Type: Application
    Filed: December 18, 2019
    Publication date: December 30, 2021
    Applicant: NOK CORPORATION
    Inventor: Naoki HAGIWARA
  • Publication number: 20210396316
    Abstract: A gasket includes an annular reinforcing ring formed around an axis, an annular base that is formed around the axis and that is formed from an elastic body into which the reinforcing ring is embedded, and an annular seal lip formed around the axis. The annular seal lip is disposed on an inner periphery side of the base and is integrated with the base. The seal lip includes one lip portion extending to the inner periphery side as progress toward one side in a direction of the axis and another seal lip portion extending to the inner periphery side as progress toward another side in the axis direction. A sum of a width of the base in a radial direction and a width of the seal lip in the radial direction is greater than a thickness of the base in the axis direction.
    Type: Application
    Filed: November 27, 2019
    Publication date: December 23, 2021
    Applicant: NOK CORPORATION
    Inventor: Naoki HAGIWARA
  • Publication number: 20210310218
    Abstract: A hydraulic excavator is provided which makes it possible to allow an operator to surely recognize an alarm that notifies the operator of non-wearing of a seatbelt even when a work is performed in a situation in which a moving object is present around the machine. A controller outputs, when a moving object is detected and wearing of a seatbelt is detected by a seatbelt detection device, a first alarm through a notification device, outputs, when the moving object is not detected and non-wearing of the seatbelt is detected by the seatbelt detection device, a second alarm through the notification device, and outputs, when the moving object is detected and non-wearing of the seatbelt is detected by the seatbelt detection device, the second alarm preferentially over the first alarm through the notification device.
    Type: Application
    Filed: October 11, 2019
    Publication date: October 7, 2021
    Inventors: Naoki HAGIWARA, Kazuhiko MIZOGUCHI, Shigeru HIRASAWA, Keitaro ITO, Keiichirou ANAHARA
  • Patent number: 11041290
    Abstract: To provide a work machine that can stop unexpected operation of actuators faster than it actually occurs even if unintended operation occurs at the time of gate lock lever switching that leads to such unexpected operation. In the work machine, a controller switches a lock valve from a lock position to a release position in a case where a lock operation device is operated from a permission position to a prohibition position; decides, on the basis of a result of detection by a pressure sensor, whether or not a pilot hydraulic fluid has been output from a pilot valve until first time elapses after the lock valve is switched to the release position; keeps the lock valve at the lock position if it is decided that the pilot hydraulic fluid has been output until the first time elapses; and switches the lock valve from the lock position to the release position if it is decided that the pilot hydraulic fluid has not been output until the first time elapses, and second time elapses.
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: June 22, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Katsuaki Kodaka, Ryohei Fukuchi, Kazuhiko Mizoguchi, Naoki Hagiwara
  • Publication number: 20210172524
    Abstract: A gasket is provided which gives stable sealing performance even when an insertion member is inclined with respect to an insertion hole. The gasket includes a body portion 121 which is to be fixed in close contact with an inner peripheral surface of an insertion hole 810 while being spaced apart from an insertion member 900, and a flexible portion 122 which is flexurally deformable and provided to extend from the body portion 121 toward an inner peripheral surface side of the body portion 121. The flexible portion 122 is flexurally bent by being pressed by an extended surface portion 920 of the insertion member 900 and comes into close contact with the extended surface portion 920 while being spaced apart from each of a housing 800 and the insertion portion 910.
    Type: Application
    Filed: September 28, 2018
    Publication date: June 10, 2021
    Inventor: Naoki HAGIWARA
  • Publication number: 20210079624
    Abstract: To provide a work machine that can stop unexpected operation of actuators faster than it actually occurs even if unintended operation occurs at the time of gate lock lever switching that leads to such unexpected operation. In the work machine, a controller switches a lock valve from a lock position to a release position in a case where a lock operation device is operated from a permission position to a prohibition position; decides, on the basis of a result of detection by a pressure sensor, whether or not a pilot hydraulic fluid has been output from a pilot valve until first time elapses after the lock valve is switched to the release position; keeps the lock valve at the lock position if it is decided that the pilot hydraulic fluid has been output until the first time elapses; and switches the lock valve from the lock position to the release position if it is decided that the pilot hydraulic fluid has not been output until the first time elapses, and second time elapses.
    Type: Application
    Filed: September 26, 2019
    Publication date: March 18, 2021
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Katsuaki KODAKA, Ryohei FUKUCHI, Kazuhiko MIZOGUCHI, Naoki HAGIWARA
  • Publication number: 20200386315
    Abstract: A sealing structure includes a sealing device including a first seal lip having a first seal-lip end, and a support ring that supports the first seal lip; and a plurality of members that define an attachment space into which the sealing device is attached, the members including an inner peripheral wall arranged on the inner periphery side of the sealing device, a first end wall arranged on one axial end of the sealing device, and a second end wall arranged on another axial end of the sealing device. The first seal-lip end has a certain amount of interference with the inner peripheral wall and the first end wall so that its radial reaction force radially presses the support ring outward and its axial reaction force presses the support ring toward the second end wall.
    Type: Application
    Filed: December 14, 2018
    Publication date: December 10, 2020
    Applicant: NOK CORPORATION
    Inventor: Naoki HAGIWARA
  • Patent number: 10612660
    Abstract: The invention provides a gasket having sealing lips in axial both ends of a gasket body in which a reinforcing ring is embedded. The gasket, has a structure in which the gasket body is displaced to the one axial side within the mounting groove when pressure acts on the gasket because the rigidity of a second sealing lip is set to be higher than the rigidity of a first sealing lip or a reinforcing ring is disposed closer to the one axial side within the gasket body. Furthermore, a seal bead which is brought into close contact to the bottom surface of the mounting groove when mounted is provided in the gasket body and a space portion surrounded by the second sealing lip, the seal bead, and the bottom surface and the other side surface of the mounting groove when mounted is provided.
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: April 7, 2020
    Assignee: NOK CORPORATION
    Inventors: Tokunori Yanagi, Masasuke Uchiyama, Takuya Amano, Yuki Nakagawa, Naoki Hagiwara
  • Publication number: 20190032783
    Abstract: The invention provides a gasket having sealing lips in axial both ends of a gasket body in which a reinforcing ring is embedded. The gasket, has a structure in which the gasket body is displaced to the one axial side within the mounting groove when pressure acts on the gasket because the rigidity of a second sealing lip is set to be higher than the rigidity of a first sealing lip or a reinforcing ring is disposed closer to the one axial side within the gasket body. Furthermore, a seal bead which is brought into close contact to the bottom surface of the mounting groove when mounted is provided in the gasket body and a space portion surrounded by the second sealing lip, the seal bead, and the bottom surface and the other side surface of the mounting groove when mounted is provided.
    Type: Application
    Filed: February 2, 2017
    Publication date: January 31, 2019
    Applicant: NOK CORPORATION
    Inventors: Tokunori YANAGI, Masasuke UCHIYAMA, Takuya AMANO, Yuki NAKAGAWA, Naoki HAGIWARA
  • Patent number: 9511374
    Abstract: It is intended to, in a horizontal dry mill, prevent blow-up and adhesion of a raw material, etc., to a raw material input section. In a horizontal dry mill (10) of the present invention, a diameter of a raw material supply section (13) provided in a grinding tank (14) is set to be less than a diameter of a grinding chamber (12). Further, a diameter of a mechanical thrust generating device of the raw material supply section (13) is set to a small value according to the diameter of the raw material supply section. Furthermore, a gap (e1) between an outside dimension of a screw (26) as the mechanical thrust generating device and an inner diameter of the grinding tank (14) in the raw material supply section (13) is set between 0.5 mm and ? of a diameter of each grinding medium M.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: December 6, 2016
    Assignee: ASHIZAWA FINETECH LTD.
    Inventors: Tsuyoshi Ishikawa, Naoki Hagiwara, Toshihiro Yamada
  • Publication number: 20150224510
    Abstract: Provided is a classifier-equipped media-agitation type pulverizer, which is capable of moving up pulverized particles to a classification section by supplying a secondary gas in an amount less than ever before, thereby enhancing classification capability of a classifying wheel.
    Type: Application
    Filed: February 19, 2013
    Publication date: August 13, 2015
    Inventors: Tsuyoshi Ishikawa, Naoki Hagiwara
  • Patent number: 8919115
    Abstract: The operability when performing a combined arm-crowd and bucket operation can be improved. A hydraulic drive device for a hydraulic excavator includes: a bucket directional control valve and a second arm directional control valve, which are connected in parallel tandem with a first hydraulic pump; a first arm directional control valve that is connected to a second hydraulic pump; and a flow rate restriction device that restricts the flow rate of pressure oil supplied to the second arm directional control valve, during crowd operation of a bucket. This flow rate restriction device includes a variable throttle whose opening is controlled so as to become smaller as a bucket operating device is operated to the crowd side, the variable throttle being provided in a bypass path connecting to the supply port of the second arm directional control valve.
    Type: Grant
    Filed: February 9, 2011
    Date of Patent: December 30, 2014
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Naoki Hagiwara, Yasuo Okano, Tsuyoshi Nakamura, Kouji Ishikawa, Kazunori Nakamura
  • Publication number: 20140367504
    Abstract: It is intended to, in a horizontal dry mill, prevent blow-up and adhesion of a raw material, etc., to a raw material input section. In a horizontal dry mill (10) of the present invention, a diameter of a raw material supply section (13) provided in a grinding tank (14) is set to be less than a diameter of a grinding chamber (12). Further, a diameter of a mechanical thrust generating device of the raw material supply section (13) is set to a small value according to the diameter of the raw material supply section. Furthermore, a gap (e1) between an outside dimension of a screw (26) as the mechanical thrust generating device and an inner diameter of the grinding tank (14) in the raw material supply section (13) is set between 0.5 mm and ? of a diameter of each grinding medium M.
    Type: Application
    Filed: December 6, 2012
    Publication date: December 18, 2014
    Inventors: Tsuyoshi Ishikawa, Naoki Hagiwara, Toshihiro Yamada
  • Patent number: 8650778
    Abstract: A hydraulic drive system realizes a jack-up operation without arrangement of a flow rate control valve and center bypass selector valve. The hydraulic drive system has first and second hydraulic pumps, first and second directional control valves for controlling boom cylinders, a third directional control valve for controlling the boom cylinders, and a third hydraulic pump for feeding pressure oil to the third directional control valve. A jack-up selector valve has a second select position where, when a pressure in bottom chambers of the boom cylinders is not higher than a predetermined pressure, feeding of pressure oil, which is delivered from the first hydraulic pump and second hydraulic pump, to rod chambers of the boom cylinders, is held permissible in association with switching of the second directional control valve and third directional control valve by a manipulation of a control device.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: February 18, 2014
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Yasuo Okano, Tsuyoshi Nakamura, Kouji Ishikawa, Kensuke Sato, Naoki Hagiwara
  • Patent number: 8589038
    Abstract: A hydraulic drive system for a working machine provides improved safety during forced regeneration. Upon input of a forced regeneration command signal from a forced regeneration switch, a controller detects non-operated states of all hydraulic actuators such as an arm cylinder arranged on a hydraulic excavator based on a lock detection signal from a gate lock detection switch, and also an attitude of a front working mechanism. The attitude is proper from the standpoint of safety. The detection is based on an arm angle signal from an arm angle sensor, a bucket angle signal from a bucket angle sensor and a boom pressure signal from a boom pressure sensor. Taking the detection of the non-operated states and proper attitude as conditions, the controller outputs control signals to a boosting proportional solenoid valve and flow-rate controlling, proportional solenoid valve to make a forced regenerator conduct forced regeneration.
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: November 19, 2013
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Naoki Hagiwara, Tsuyoshi Nakamura, Kensuke Sato, Yasuo Okano, Kouji Ishikawa, Masanori Ezawa
  • Patent number: 8516805
    Abstract: Disclosed is a hydraulic drive system for a working machine, which enables to conduct forced regeneration continuously for a sufficient time. Based on an input of a lock detection signal S1 from a gate lock detection switch 40, a controller 50 detects that a gate lock lever 32 for controlling a gate lock on/off valve 33 is in a locked state, in other words, hydraulic actuators such as an arm cylinder 12 arranged on a hydraulic excavator 1 are all in non-operated states. Upon an input of a forced regeneration command signal So from a forced regeneration switch 53 in this detected state, control signals Cp,Cf are outputted to a boosting control valve 51 and regulator 52 to make a forced regeneration means (an arm cylinder control valve 27 and the regulator 52) conduct forced regeneration.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: August 27, 2013
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Naoki Hagiwara, Tsuyoshi Nakamura, Kensuke Sato, Yasuo Okano, Kouji Ishikawa, Mitsuhiko Kanehama, Hiroyuki Azuma
  • Publication number: 20120163949
    Abstract: A hydraulic drive system realizes a jack-up operation without arrangement of a flow rate control valve and center bypass selector valve. The hydraulic drive system has first and second hydraulic pumps, first and second directional control valves for controlling boom cylinders, a third directional control valve for controlling the boom cylinders, and a third hydraulic pump for feeding pressure oil to the third directional control valve. A jack-up selector valve has a second select position where, when a pressure in bottom chambers of the boom cylinders is not higher than a predetermined pressure, feeding of pressure oil, which is delivered from the first hydraulic pump and second hydraulic pump, to rod chambers of the boom cylinders, is held permissible in association with switching of the second directional control valve and third directional control valve by a manipulation of a control device.
    Type: Application
    Filed: September 1, 2010
    Publication date: June 28, 2012
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Yasuo Okano, Tsuyoshi Nakamura, Kouji Ishikawa, Kensuke Sato, Naoki Hagiwara