Patents by Inventor Ei Takahashi

Ei Takahashi 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).

  • Patent number: 8899129
    Abstract: A tilt-up mechanism for tilting up an upper column of a steering column from a drive position to a tilt-up position is configured independently from a tilt angle adjusting mechanism and a column length adjusting mechanism. When an operator who is to get on/off an operator's seat steps on and operates a pedal of the tilt-up mechanism, an engaged state of a lock pin with respect to a tilt-up member is disengaged. The tilt-up member is rotated around a support shaft, by a spring force of a tilt-up spring, whereby the upper column is tilted up together with a steering wheel in a direction (A) away from the operator's seat. At this time, the tilt angle and the column length can be held at positions adjusted in advance.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: December 2, 2014
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Wataru Isaka, Ei Takahashi, Kazunori Komatsu, Shigeru Kitagami, Yuichi Koshizaka
  • Patent number: 8744702
    Abstract: A work vehicle control device includes: a rotation speed control unit that controls an engine rotation speed in correspondence to an accelerator pedal operation quantity indicating an operating extent of an accelerator pedal; a speed ratio detection unit that detects a ratio of speed at an input shaft and at an output shaft of a torque converter, which is disposed between the engine and wheels; a decision-making unit that makes a decision that a fuel efficiency deteriorating condition exists if the torque converter speed ratio is less than a predetermined value or if the torque converter speed ratio is equal to or greater than the predetermined value and a target engine rotation speed corresponding to an operation of the accelerator pedal is greater than a preset value; and an informing unit that informs results of the decision made by the decision-making unit.
    Type: Grant
    Filed: June 18, 2010
    Date of Patent: June 3, 2014
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Koji Hyodo, Masaki Yoshikawa, Ei Takahashi, Katsutaka Hara
  • Publication number: 20140109715
    Abstract: A tilt-up mechanism for tilting up an upper column of a steering column from a drive position to a tilt-up position is configured independently from a tilt angle adjusting mechanism and a column length adjusting mechanism. When an operator who is to get on/off an operator's seat steps on and operates a pedal of the tilt-up mechanism, an engaged state of a lock pin with respect to a tilt-up member is disengaged. The tilt-up member is rotated around a support shaft, by a spring force of a tilt-up spring, whereby the upper column is tilted up together with a steering wheel in a direction (A) away from the operator's seat. At this time, the tilt angle and the column length can be held at positions adjusted in advance.
    Type: Application
    Filed: December 14, 2011
    Publication date: April 24, 2014
    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Wataru Isaka, Ei Takahashi, Kazunori Komatsu, Shigeru Kitagami, Yuichi Koshizaka
  • Publication number: 20140003900
    Abstract: A wheel loader includes a vehicle body having wheels a work implement including an arm, a bucket, and an arm cylinder and a bucket cylinder that drive the arm and the bucket, respectively, and a work implement control device that directs an operation of the work implement. The work implement control device includes an arm control lever disposed on the right of a driver's seat, the arm control lever controlling operations of the arm, and two kickdown switches disposed at an upper surface and a left side surface, respectively, of a grip of the arm control lever. Operability can thereby be improved even further.
    Type: Application
    Filed: March 15, 2012
    Publication date: January 2, 2014
    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Koji Hyodo, Masaki Yoshikawa, Ei Takahashi, Wataru Isaka
  • Publication number: 20120089307
    Abstract: A work vehicle control device includes: a rotation speed control unit that controls an engine rotation speed in correspondence to an accelerator pedal operation quantity indicating an operating extent of an accelerator pedal; a speed ratio detection unit that detects a ratio of speed at an input shaft and at an output shaft of a torque converter, which is disposed between the engine and wheels; a decision-making unit that makes a decision that a fuel efficiency deteriorating condition exists if the torque converter speed ratio is less than a predetermined value or if the torque converter speed ratio is equal to or greater than the predetermined value and a target engine rotation speed corresponding to an operation of the accelerator pedal is greater than a preset value; and an informing unit that informs results of the decision made by the decision-making unit.
    Type: Application
    Filed: June 18, 2010
    Publication date: April 12, 2012
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Koji Hyodo, Masaki Yoshikawa, Ei Takahashi, Katsutaka Hara
  • Patent number: 6273632
    Abstract: A joint pin lock system or mechanism for a pivotal pin joint which connects one mechanical structural member between a pair of bracket portions of another mechanical structural member pivotally relative to each other by means of a joint pin passed through a connecting end portion of one mechanical structural member and the bracket portions of the other mechanical structural member.
    Type: Grant
    Filed: August 19, 1999
    Date of Patent: August 14, 2001
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Ei Takahashi, Ryohei Suzuki, Toshio Hasegawa, Hiroshige Kurosaka
  • Patent number: 6230090
    Abstract: When an arm end exceeds a boundary line K2 and enters a slowdown area R1, a proportional solenoid pressure reducing valve 13 is operated to reduce a pilot pressure for slowing down a first boom cylinder 1A, thereby slowing down an arm end speed. When the arm end exceeds a boundary line K1 and enters a restoration area R2, a restoration gain is calculated in control gain block 200 depending on an intrusion amount by which the arm end enters the restoration area, while a feedback gain is calculated depending on an arm end speed at that time on the basis of functions 204, 205, 206, 207, 208 and 209. In accordance with these gains, a second boom 2 is automatically dumped depending on the intrusion amount of the arm end into the restoration area and the arm end speed at that time so that the arm end is moved for return to the slowdown area. As a result, such work as requiring a work front to be moved toward the operator is continuously smoothly performed and working efficiency is improved.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: May 8, 2001
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Ei Takahashi, Kazuhiro Sunamura, Yusuke Kajita
  • Patent number: 6164069
    Abstract: Arranged on a side of a first pump are a flow control valve for controlling a first boom cylinder, a flow control valve for an arm, said flow control valve being connected in tandem with said flow control valve and being adapted to control an arm cylinder, and a flow control valve for a second boom, said flow control valve being connected to a downstream side of the flow control valve and being adapted to control a second boom cylinder.
    Type: Grant
    Filed: June 23, 1998
    Date of Patent: December 26, 2000
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Ei Takahashi, Genroku Sugiyama
  • Patent number: 6020651
    Abstract: A pump controller (40) calculates a pump maximum absorbing horsepower and a pump required horsepower based on an accelerator signal, a pump delivery pressure and an operation signal, determines an engine required horsepower (PN) by selecting minimum one of both horsepower values, and calculates a pump required revolution speed based on the accelerator signal, the operation signal and an engine revolution speed signal to determine an engine required revolution speed (NN). The engine controller (40) determines, from the engine required horsepower (PN), a required-horsepower-referenced target engine revolution speed (NK) at which a fuel consumption rate is minimized, and selects larger one of the engine required revolution speed (NN) and the target engine revolution speed (NK) as an engine target revolution speed (NZ) to control an injected fuel amount and fuel injection timing, thereby controlling an engine torque and an engine output revolution speed.
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: February 1, 2000
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kazunori Nakamura, Ei Takahashi, Toichi Hirata
  • Patent number: 5930996
    Abstract: In the arm-crowding or track operation, a calculating portion (700d2 or 700d4) calculates a modification gain (KAC or KTR) depending on an operation pilot pressure and a calculating portion (700g) calculates a decrease modification (DND) based on the KAC or KTR, while a calculating portion (700m or 700p) calculates a modification gain (KACH or KTRH) depending on an operation pilot pressure and calculating portions (700q-700s) calculate an increase modification (DNH) based on the KACH or KTRH. A reference target engine revolution speed NR0 is modified using the DND and DNH. In other operations than the arm-crowding and track operations, NR0 is modified using only the decrease modification (DND) calculated from the modification gain just depending on the operation pilot pressure. In the operation where an engine revolution speed is desired to become higher as an actuator load increases, the engine revolution speed can be controlled in accordance with change of the actuator load as well.
    Type: Grant
    Filed: October 1, 1998
    Date of Patent: August 3, 1999
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kazunori Nakamura, Ei Takahashi, Tsukasa Toyooka, Kouji Ishikawa, Tsuyoshi Nakamura, Yoichi Kowatari, Tadatoshi Shimamura, Genroku Sugiyama, Toichi Hirata
  • Patent number: 5911506
    Abstract: A reference pump-delivery-rate calculating portion calculates a reference delivery rate of a hydraulic pump by referring to a table stored in a memory based on a control pilot pressure for the hydraulic pump. A target pump-delivery-rate calculating portion divides the reference delivery rate by a ratio of a maximum revolution speed to a target engine revolution speed, thereby calculating a target delivery rate. A target pump tilting calculating portion divides the target delivery rate by an actual engine revolution speed and a constant, thereby calculating a target tilting. A solenoid output current calculating portion calculates a drive current to provide the target tilting and outputs the drive current to a solenoid control valve. The pump delivery rate is thereby controlled with good response following input change of an operation instructing device.
    Type: Grant
    Filed: October 6, 1998
    Date of Patent: June 15, 1999
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kazunori Nakamura, Ei Takahashi, Tsukasa Toyooka, Kouji Ishikawa, Tsuyoshi Nakamura, Yoichi Kowatari, Tadatoshi Shimamura, Genroku Sugiyama, Toichi Hirata
  • Patent number: D549738
    Type: Grant
    Filed: December 29, 2005
    Date of Patent: August 28, 2007
    Assignees: Hitachi Construction Machinery Co., Ltd., TCM Co., Ltd.
    Inventors: Kazuhiko Hiraoka, Jujutsu Murota, Tsuyoshi Sakyo, Kazunori Komatsu, Ei Takahashi, Hirofumi Ouchi
  • Patent number: D652061
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: January 10, 2012
    Assignees: Hitachi Construction Machinery Co., Ltd., KCM Corporation
    Inventors: Kazuhiko Hiraoka, Ei Takahashi, Yoshihiro Ito, Kazunori Komatsu, Hiroki Nakazono, Takashi Takeyama, Tadayoshi Aoki, Akira Shimohira, Hirofumi Oouchi
  • Patent number: D652063
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: January 10, 2012
    Assignees: Hitachi Construction Machinery Co., Ltd., KCM Corporation
    Inventors: Akitaka Takeuchi, Wataru Isaka, Kazunori Komatsu, Ei Takahashi, Hiroki Nakazono, Koji Hyodo, Masaki Yoshikawa, Hirofumi Oouchi
  • Patent number: D652433
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: January 17, 2012
    Assignees: Hitachi Construction Machinery Co., Ltd., KCM Corporation
    Inventors: Akitaka Takeuchi, Wataru Isaka, Kazunori Komatsu, Ei Takahashi, Hiroki Nakazono, Hirofumi Oouchi
  • Patent number: D854587
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: July 23, 2019
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Atsushi Ninomiya, Yusuke Daimon, Katsumi Usami, Shigehisa Hagura, Ei Takahashi, Takeo Manabe
  • Patent number: D856379
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: August 13, 2019
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Atsushi Ninomiya, Yusuke Daimon, Katsumi Usami, Shigehisa Hagura, Ei Takahashi, Takeo Manabe
  • Patent number: D856380
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: August 13, 2019
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Atsushi Ninomiya, Yusuke Daimon, Katsumi Usami, Ei Takahashi, Takeo Manabe
  • Patent number: D856381
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: August 13, 2019
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Atsushi Ninomiya, Yusuke Daimon, Katsumi Usami, Ei Takahashi, Takeo Manabe
  • Patent number: D857755
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: August 27, 2019
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Atsushi Ninomiya, Yusuke Daimon, Katsumi Usami, Shigehisa Hagura, Ei Takahashi, Takeo Manabe