Patents by Inventor Shunichi Doi

Shunichi Doi 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: 7600821
    Abstract: A seat provides a band-like support for the body sides of a user so as to reduce the supporting pressure on the user's lumbar and to hold the user's upper body stably. In this seat, the center of a load to be received in regions symmetrically divided to a vertical central line of the seat are positioned outside of a back region defined by left and right angulus inferior scapulae and by the upper ends of iliac bones. Moreover, the load ratios in the individual regions are not more than 25% in the region corresponding to a region extended downward from the back region.
    Type: Grant
    Filed: July 3, 2002
    Date of Patent: October 13, 2009
    Assignee: Delta Tooling Co., Ltd.
    Inventors: Eiichi Yasuda, Shunichi Doi, Kazukata Takei, Etsunori Fujita, Yumi Ogura, Seiji Kawasaki
  • Patent number: 7275793
    Abstract: A seat includes a seat frame, and a cushion material supported by the seat frame and having a three-dimensional knitted fabric which is formed by joining, with connecting threads, a pair of ground knit fabrics which are disposed so as to be separated from one another. The cushion material includes a first region whose elastic compliance when a reaction force is applied to an extending side of the cushion material when an occupant is seated on the seat is substantially equivalent to an elastic compliance of a portion of the occupant's body pressing the cushion material and a second region whose elastic compliance is larger than that of the first region. Accordingly, a thin and light seat can be provided, load concentration on the occupant's tuber ishiadicum bottom portion when seated for a long period of time can be mitigated, and vibration-transmitting characteristics can be improved.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: October 2, 2007
    Assignees: Delta Tooling Co., Ltd., Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Etsunori Fujita, Seiji Kawasaki, Yumi Ogura, Eiichi Yasuda, Shunichi Doi, Etsuko Kato, Katsuya Ibaraki
  • Patent number: 7134718
    Abstract: An upper end portion of a seat backrest and a lower end portion of a head rest are superposed together. A rear end portion of an upper portion cushion member and a lower end portion of the seat backrest are superposed together. These superposed portions are sewn together by thin threads which break when pressing force of a predetermined value or greater is applied to the seat backrest. Thus, when pressing force of the predetermined value or greater is applied to the seat backrest, the thin threads break. A portion of the seat backrest which a shoulder portion of a seated occupant contacts, and a portion of the seat backrest which buttocks of the seated occupant contact, are enlarged, and impact force can be damped.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: November 14, 2006
    Assignees: Kabushiki Kaisha Toyota Chuo Kenkyusho, Delta Tooling Co., Ltd.
    Inventors: Eiichi Yasuda, Shunichi Doi, Katsuya Ibaraki, Etsunori Fujita, Yumi Ogura, Seiji Kawasaki
  • Publication number: 20040145230
    Abstract: A seat comprising a seat frame, and a cushion material supported by the seat frame and having a three-dimensional knitted fabric which is formed by joining, with connecting threads, a pair of ground knit fabrics which are disposed so as to be separated from one another, wherein the cushion material comprising a first region whose elastic compliance when a reaction force is applied to an extending side of the cushion material when an occupant is seated on the seat is substantially equivalent to an elastic compliance of a portion of the occupant's body pressing the cushion material and a second region whose elastic compliance is larger than that of the first region. Accordingly, a thin and light seat can be provided, load concentration on the occupant's tuber ishiadicum bottom portion when seated for a long period of time can be mitigated, and vibration-transmitting characteristics can be improved.
    Type: Application
    Filed: November 17, 2003
    Publication date: July 29, 2004
    Inventors: Etsunori Fujita, Seiji Kawasaki, Yumi Ogura, Eiichi Yasuda, Shunichi Doi, Etsuko Kato, Katsuya Ibaraki
  • Publication number: 20030201659
    Abstract: An upper end portion of a seat backrest and a lower end portion of a head rest are superposed together. A rear end portion of an upper portion cushion member and a lower end portion of the seat backrest are superposed together. These superposed portions are sewn together by thin threads which break when pressing force of a predetermined value or greater is applied to the seat backrest. Thus, when pressing force of the predetermined value or greater is applied to the seat backrest, the thin threads break. A portion of the seat backrest which a shoulder portion of a seated occupant contacts, and a portion of the seat backrest which buttocks of the seated occupant contact, are enlarged, and impact force can be damped.
    Type: Application
    Filed: April 25, 2003
    Publication date: October 30, 2003
    Applicants: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, DELTA TOOLING CO., LTD.
    Inventors: Eiichi Yasuda, Shunichi Doi, Katsuya Ibaraki, Etsunori Fujita, Yumi Ogura, Seiji Kawasaki
  • Publication number: 20030006640
    Abstract: A seat provides a band-like support for the body sides of a user so as to reduce the supporting pressure on the user's lumbar and to hold the user's upper body stably. In this seat, the center of a load to be received in regions symmetrically divided to a vertical central line of the seat are positioned outside of a back region defined by left and right angulus inferior scapulae and by the upper ends of iliac bones. Moreover, the load ratios in the individual regions are not more than 25% in the region corresponding to a region extended downward from the back region.
    Type: Application
    Filed: July 3, 2002
    Publication date: January 9, 2003
    Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Eiichi Yasuda, Shunichi Doi, Kazukata Takei, Etsunori Fujita, Yumi Ogura, Seiji Kawasaki
  • Patent number: 4969355
    Abstract: A tire uniformity measuring apparatus having: a drum for rotating a tire; an oscillating member disposed parallel to a drum rotating shaft and pivotally supported on a machine base through a fulcrum; a movable member disposed in parallel to the drum rotating shaft in the plane including the drum rotating shaft and a tire rotating shaft, the movable member being laterally movable in response to a load acting on the tire in a lateral direction perpendicular to the radial direction of the tire; a load applying member for applying in advance a predetermined load to the tire; and a displacement detecting member for detecting as a displacement of the movable member the displacement of the tire rotating shaft which is dependent on variation in the lateral load; thereby detecting a variation in the lateral load of the tire.
    Type: Grant
    Filed: February 8, 1990
    Date of Patent: November 13, 1990
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Shunichi Doi, Satoru Matsushima, Yoshiteru Mizutani, Yuzo Yamamoto, Michio Ishiguro, Shigeru Sakuma, Noboru Sugiura
  • Patent number: 4949262
    Abstract: An electronic controlled fluid suspension system in which a change in a vehicle attitude is expected in advance by an advance control means responsive to a driving state detected by a driving state detection means, and the current vehicle attitude is feedback-controlled by a feedback control means. The shares of the advance control amount and the feedback control amount are calculated by a share determination means so that final control amount is determined based on the shares. Fluid flow to and from the fluid suspension is controlled by a fluid flow control means in response to the final control amount. In such control system, the advance control and the feedback control are smoothly switched, which results in improved maneuverability and stability of the vehicle.
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: August 14, 1990
    Assignees: Kabushiki Kaisha Toyota Chuo Kenkyusho, Toyota Jidosha Kabushiki Kaisha
    Inventors: Shuuichi Buma, Toshio Aburaya, Takashi Yonekawa, Osamu Takeda, Shingo Urababa, Shunichi Doi
  • Patent number: 4937748
    Abstract: An electronic controlled suspension system detects a load on the fluid actuators and calculates a torsional load on the vehicle. Responsive to the calculated torsional load, corrective control is executed on the fluid flow to and from the fluid actuators, eliminating torsional load on the vehicle. Therefore, the driving characteristic is prevented from changing due to an unbalanced load on the vehicle. On the other hand, the electronic controlled suspension system detects a vehicle's cornering state. Responsive to the cornering state detected, control signals are output to increase the roll stiffness distribution to the front wheels. As a result, the roll stiffness distribution to the front wheels while the vehicle is about to corner becomes larger than that while the vehicle is steadily cornering. Responsive to the control signals, the vehicle attitude is controlled by supplying and discharging fluid to and from fluid actuators.
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: June 26, 1990
    Assignee: Kabushiki Kaisha Toyota Toyota Jidosha Kabushiki Kaisha
    Inventors: Takashi Yonekawa, Shuuichi Buma, Toshio Aburaya, Osamu Takeda, Shunichi Doi
  • Patent number: 4916632
    Abstract: A vibration control apparatus detects a physical value influencing characteristics of a suspension supporting a vibrating body and a state value representing movement of the suspension, calculates an optimal target control force in consideration of an external force or disturbance acting on the suspension on the basis of the physical and state values as outputs from a state detecting system, calculates the detection control force corresponding to the detected physical value, and continuously variably controls the suspension characteristics so as to generate a control force corresponding to the difference between the target and detection control forces in consideration of the external force or disturbance acting on the suspension, whereby vibrations are prevented by equivalently applying the target control force on the suspension.
    Type: Grant
    Filed: November 3, 1986
    Date of Patent: April 10, 1990
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Shunichi Doi, Eiichi Yasuda, Yasutaka Hayashi
  • Patent number: 4907154
    Abstract: In a vibration control apparatus, a physical value influencing characteristics of a suspension for supporting a vibrating body and a state value representing movement of the suspension are detected. A frequency distribution of these values with respect to levels is calculated every predetermined period of time. A target control force is calculated on the basis of the frequency distribution in consideration of a continuous change in external state. An actual control force (detection control force) is calculated by the detected physical value. The suspension characteristics are continuously, variably controlled so as to equivalently generate a control force corresponding to a difference between the target and detection control forces. As a result, the target control force is equivalently applied to the suspension, thereby damping the vibrations.
    Type: Grant
    Filed: October 27, 1987
    Date of Patent: March 6, 1990
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Eiichi Yasuda, Shunichi Doi, Yasutaka Hayashi
  • Patent number: 4897776
    Abstract: In controlling roll and pitch of a vehicle body responsive to a displacement signal produced at each wheel of the vehicle, each signal is low-pass-filtered with a certain threshold frequency to prevent hunting of the control due to an excessively high frequency component (such as noise or a component corresponding to road irregularities) of the signal. According to this invention, the threshold frequency is changed to a higher value in order to get quick attitude control when the roll or pitch of the body is expected, while it is set at a lower value when no such attitude change is expected in order to prevent hunting of the control.
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: January 30, 1990
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shingo Urababa, Shuuichi Buma, Toshio Aburaya, Takashi Yonekawa, Osamu Takeda, Shunichi Doi
  • Patent number: 4834205
    Abstract: An apparatus for controlling steering of wheels of a vehicle comprises a control means, a driving means, and an actuator means. The control means comprises a feed forward signal operating means, a feed back signal operating means for generating signals for variables representing vehicle behaviors and output from a vehicle behavior sensor, and a control signal operating means for calculating a difference or sum of the signals output from the feed forwad and feedback signal operating means. The feed forward signal operating means comprises a steering angle signal circuit, a steering angular velocity signal operating circuit, a steering angle signal operating circuit having a first coefficient circuit for multiplying a steering angle signal with a coefficient, and an adder for adding the outputs from the steering angle signal circuit, the steering angle signal operating circuit, and the steering angular velocity operating circuit.
    Type: Grant
    Filed: February 3, 1988
    Date of Patent: May 30, 1989
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Masahiko Mizuno, Yasushi Amano, Eiichi Yasuda, Shunichi Doi, Yasutaka Hayashi, Hiroyuki Yamaguchi
  • Patent number: 4821188
    Abstract: In this vehicle height adjustment system, a plurality of actuator assemblies are provided, one corresponding to each one of the vehicle wheels and resiliently suspending it from the vehicle body. These actuator assemblies have pressure chambers, and each is adapted to increase or decrease the vehicle height at a location corresponding to its corresponding wheel as respective results of supplying or discharging of working fluid to or from its pressure chamber. Working fluid supply/discharge means are provided corresponding to the actuator assemblies and supply and discharge working fluid to and from their pressure chambers. Vehicle height detection means are provided for sensing the heights of the vehicle above the wheels. A means detects the rate of change of the steering angle of the vehicle.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: April 11, 1989
    Assignees: Toyota Jidosha Kabushiki Kaisha, Toyota Central Research and Development Laboratories, Inc.
    Inventors: Hiroyuki Ikemoto, Nobutaka Oowa, Yasuji Arai, Osamu Yasuike, Shunichi Doi
  • Patent number: 4821191
    Abstract: In this vehicle height adjustment system, a plurality of actuator assemblies are provided, one corresponding to each one of the vehicle wheels and resiliently suspending it from the vehicle body. These actuator assemblies have pressure chambers, and each is adapted to increase or decrease the vehicle height at a location corresponding to its corresponding wheel as respective results of supplying or discharging of working fluid to or from its pressure chamber. Working fluid supply/discharge means are provided corresponding to the actuator assemblies and supply and discharge working fluid to and from their pressure chambers. Wheel loading detection means are provided for sensing parameters representative of the loadings imposed by the vehicle body on the wheels, and vehicle height detection means are provided for sensing the heights of the vehicle above the wheels.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: April 11, 1989
    Assignees: Toyota Jidosha Kabushiki Kaisha, Toyota Central Research and Development Laboratories, Inc.
    Inventors: Hiroyuki Ikemoto, Yasuji Arai, Osamu Yasuike, Nobutaka Oowa, Shunichi Doi
  • Patent number: 4812579
    Abstract: A process for producing N-substituted maleimides which comprises heating maleic anhydride and an aromatic or aliphatic amine, or maleic acid monoamides obtained from them, in the presence of an ion exchange resin in an organic solvent to effect cyclodehydration.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: March 14, 1989
    Assignee: Nitto Chemical Industry Co., Ltd.
    Inventors: Shunichi Doi, Yasuyuki Takayanagi
  • Patent number: 4809176
    Abstract: In this system for vehicle roll control, a plurality of duty radio controlled actuator assemblies are provided, one corresponding to each one of the vehicle wheels, and resiliently suspended from the vehicle body. These actuator assemblies have pressure chambers, and each is adapted to increase or decrease the vehicle height at a location corresponding to its corresponding vehicle wheel as a result of the supplying or discharging of working fluid to or from its pressure chamber. Working fluid supplying and discharging means supply working fluid to and discharge working fluid from the pressure chambers of the actuator assemblies. The system further includes means for sensing the road speed of the vehicle, and means for sensing the steering angle of the vehicle. Vehicle height detection means are also provided for sensing the heights of the vehicle above the vehicle wheels.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: February 28, 1989
    Assignees: Toyota Jidosha Kabushiki Kaisha, Toyota Central Research and Development Laboratories, Inc.
    Inventors: Nobutaka Oowa, Yasuji Arai, Osamu Yasuike, Hiroyuki Ikemoto, Shunichi Doi
  • Patent number: 4807128
    Abstract: In this system for vehicle roll control, one actuator assembly is provided corresponding to each vehicle wheel and resiliently suspends it from the vehicle body. Each of these actuator assemblies is adapted to increase or decrease the vehicle height at its vehicle wheel as a result of a control signal being supplied. Control means are provided corresponding to the actuator assemblies and serve to supply control signals to them. A vehicle speed detecting means senses road speed, a steering angle detecting means senses steering angle, a means senses the rate of change of steering angle, and a means detects the actual roll angle .phi..sub.t of the vehicle body. A computing and control means computes a steady state roll angle .phi..sub..infin. of the vehicle body from the vehicle speed and the steering angle, advances the phase of a signal representative of the steady state roll angle .phi..sub..infin. to thereby compute a compensating value .PHI..sub..infin. of roll angle, computes an amendment value .phi..sub.
    Type: Grant
    Filed: February 20, 1987
    Date of Patent: February 21, 1989
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroyuki Ikemoto, Nobutaka Owa, Yasutaka Hayashi, Shunichi Doi
  • Patent number: 4803627
    Abstract: In this system for vehicle roll control, a plurality of actuator assemblies are provided, one corresponding to each one of the vehicle wheels and resiliently suspending it from the vehicle body. Each of these actuator assemblies is adapted to increase or decrease the vehicle height at a location corresponding to its corresponding vehicle wheel as results of control signals being supplied to it. A plurality of control means are provided corresponding to the actuator assemblies and serve to supply control signals to them. A vehicle speed detecting means senses the road speed of the vehicle, a steering angle detecting means senses the steering angle of the vehicle, and a lateral acceleration detecting means detects the lateral acceleration of the vehicle body.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: February 7, 1989
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Osamu Yasuike, Yasuji Arai, Hiroyuki Ikemoto, Nobutaka Owa, Shunichi Doi
  • Patent number: 4797823
    Abstract: In this roll control system, suspension means are provided for resiliently suspending the vehicle wheels with variable hardness/softness characteristics, each suspension means including an actuator with a pressure chamber which increases or decreases wheel suspension height according to the supply or discharge of working fluid. Working fluid supply/discharge means are provided for the actuators, to supply and discharge working fluid to and from actuator pressure chambers. The road speed, the steering angle, and the actual body roll angle are detected. Means for computing and control computes a steady state vehicle body roll angle .phi..sub..infin. from the vehicle speed and steering angle, advances the phase of a signal indicative of .phi..sub..infin. to compute a compensating roll angle value .PHI..sub..infin., and then computes a difference value .phi. based upon a desired roll angle .phi..sub.a, .PHI..sub..infin., and the actual roll angle .phi..sub.t, according to the equation:.phi.=.phi..sub.a -(k1.PHI..
    Type: Grant
    Filed: October 21, 1986
    Date of Patent: January 10, 1989
    Assignees: Toyota Jidosha Kabushiki Kaisha, Toyota Central Research & Development Laboratories, Inc.
    Inventors: Hiroyuki Ikemoto, Nobutaka Oowa, Yasutaka Hayashi, Shunichi Doi