Patents by Inventor Koei Matsukawa

Koei Matsukawa 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).

  • Elevator apparatus with sheave rotational speed difference determination for detecting an abnormality
    Patent number: 7637357
    Abstract: In an elevator apparatus, a main rope suspending a car and a balance weight is looped around a traction sheave and a driven sheave of a traction machine. A driving-side speed detecting portion for detecting rotational speed of the traction sheave and a driven-side speed detecting portion for detecting rotational speed of the driven sheave are electrically connected to an operation control device. The operation control device includes a determination portion determining presence or absence of an abnormality in an elevator by calculating speed difference between rotational speeds of the traction sheave and comparing the speed difference to a fixed reference value, set in advance, and a control portion for controlling the operation of the elevator based on information from the determination portion.
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: December 29, 2009
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroyuki Nakagawa, Koei Matsukawa, Yoshikatsu Hayashi, Eiji Ando, Atsushi Mitsui
  • Elevator Apparatus
    Publication number: 20070227826
    Abstract: In an elevator apparatus, a main rope suspending a car and a balance weight is looped around a traction sheave and a driven sheave of a traction machine. A driving-side speed detecting portion for detecting rotational speed of the traction sheave and a driven-side speed detecting portion for detecting rotational speed of the driven sheave are electrically connected to an operation control device. The operation control device includes a determination portion determining presence or absence of an abnormality in an elevator by calculating speed difference between rotational speeds of the traction sheave and the driven sheave and comparing the speed difference to a fixed reference value, set in advance, and a control portion for controlling the operation of the elevator based on information from the determination portion.
    Type: Application
    Filed: September 9, 2004
    Publication date: October 4, 2007
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroyuki Nakagawa, Koei Matsukawa, Yoshikatsu Hayashi, Eiji Ando, Atsushi Mitsui
  • Porous-plastic bearing and method of manufacturing porous-plastic bearing
    Patent number: 5707718
    Abstract: A porous-plastic bearing comprises a porous-plastic sliding bearing member which is formed by gathering a cluster of plastic particles each having a volume in the range of from about 0.004 mm.sup.3 to about 4 mm.sup.3 and sintering the cluster of plastic particles while setting its porosity at a selected value in the range of from about 10% to about 30%. Furthermore, the sliding bearing member comprises a plurality of plastic particles in any longitudinal or cross section. Pores formed within the sliding bearing member are impregnated with or filled with a lubricating agent.
    Type: Grant
    Filed: February 8, 1996
    Date of Patent: January 13, 1998
    Assignees: Mitsubishi Electric Home Appliance Co., Ltd., Mitsubishi Denki Kabushiki Kaisha
    Inventors: Koei Matsukawa, Katsunori Sato, Toshihisa Imai