Patents by Inventor Tamio Sakurai

Tamio Sakurai 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: 7794017
    Abstract: A front portion of a seat 2 is connected to a base 6 by a front support link 7 and a first support shaft 8, and a rear portion of the seat 2 is connected to a rocking frame 11 by way of a rear support link 14. The first support shaft 8 is slidably fitted to the base 6. An upper portion of the backrest 3 is attached to an upper portion of a back frame 12. When a person is seated, the seat 2 is moved down and moved back, and a lumber support portion 17a of the backrest 3 is moved forwardly in cooperation with movement of the seat 2. Therefore, even when a person is shallowly seated on a chair, the waist portion of the person can precisely be supported. The cooperatively moving means includes a cooperatively moving link mechanism comprising a first through a fifth cooperatively moving link 43, 46, 48, 21 and 20. The third link 48 can be pivoted to return against an elasticity of a second returning spring 49. Therefore, a person is not hampered from being seated thereon deeply.
    Type: Grant
    Filed: August 18, 2006
    Date of Patent: September 14, 2010
    Assignee: Itoki Corporation
    Inventors: Satoshi Kan, Katunori Hama, Tamio Sakurai, Yasuhiro Nakamura
  • Publication number: 20090146476
    Abstract: A front portion of a seat 2 is connected to a base 6 by a front support link 7 and a first support shaft 8, and a rear portion of the seat 2 is connected to a rocking frame 11 by way of a rear support link 14. The first support shaft 8 is slidably fitted to the base 6. An upper portion of the backrest 3 is attached to an upper portion of a back frame 12. When a person is seated, the seat 2 is moved down and moved back, and a lumber support portion 17a of the backrest 3 is moved forwardly in cooperation with movement of the seat 2. Therefore, even when a person is shallowly seated on a chair, the waist portion of the person can precisely be supported. The cooperatively moving means includes a cooperatively moving link mechanism comprising a first through a fifth cooperatively moving link 43, 46, 48, 21 and 20. The third link 48 can be pivoted to return against an elasticity of a second returning spring 49. Therefore, a person is not hampered from being seated thereon deeply.
    Type: Application
    Filed: August 18, 2006
    Publication date: June 11, 2009
    Applicant: ITOKI CORPORATION
    Inventors: Satoshi Kan, Katunori Hama, Tamio Sakurai, Yasuhiro Nakamura
  • Patent number: 5598631
    Abstract: A machine element has a shaft and at least a fitting member such as a cam or gear mounted on the shaft by pressure-fit. The fitting member has a bore for receiving the shaft. The shaft is formed with protrusions at least an area of the shaft on which the fitting member is fitted. The protrusions preferably extend continuously or discretely, peripherally or helically on the outer surface of the shaft and have a diameter larger than than the remaining areas of the shaft. The bore of the fitting member is formed with at least an inner chordal surface having a perpendicular from the center of the bore smaller than the radius of the protrusions. The fitting member is configured to be forced onto the protrusions of the shaft with at least one inner chordal surface forming a corresponding outer surface on the protrusions in a shaving and/or deforming operation.
    Type: Grant
    Filed: March 3, 1995
    Date of Patent: February 4, 1997
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Koji Umezawa, Tamio Sakurai
  • Patent number: 5419217
    Abstract: A machine element has a shaft and at least a fitting member such as a cam or gear mounted on the shaft by pressure-fit. The fitting member has a bore for receiving the shaft. The shaft is formed with protrusions at least an area of the shaft on which the fitting member is fitted. The protrusions preferably extend continuously or discretely, peripherally or helically on the outer surface of the shaft and have a diameter larger than than the remaining areas of the shaft. The bore of the fitting member is formed with at east an inner chordal surface having a perpendicular from the center of the bore smaller than the radius of the protrusions. The fitting member is configured to be forced onto the protrusions of the shaft with at least one inner chordal surface forming a corresponding outer surface on the protrusions in a shaving and/or deforming operation.
    Type: Grant
    Filed: June 29, 1993
    Date of Patent: May 30, 1995
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Koji Umezawa, Tamio Sakurai
  • Patent number: D510492
    Type: Grant
    Filed: March 17, 2004
    Date of Patent: October 11, 2005
    Assignees: Itoki Co., Ltd., Itoki Crebio Corporation
    Inventors: Tamio Sakurai, Koichiro Hayashi
  • Patent number: D512251
    Type: Grant
    Filed: March 17, 2004
    Date of Patent: December 6, 2005
    Assignees: Itoki Co., Ltd., Itoki Crebio Corporation
    Inventors: Tamio Sakurai, Koichiro Hayashi
  • Patent number: D730659
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: June 2, 2015
    Assignee: ITOKI CORPORATION
    Inventor: Tamio Sakurai