Patents by Inventor Katsuyuki Nishioka

Katsuyuki Nishioka 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).

  • Method for heat treatment of coiled spring
    Patent number: 8460483
    Abstract: A method for heat treatment of a coiled spring includes cold forming a coiled spring, annealing the coiled spring after the cold forming, thereby removing of residual stress generated in the cold forming, in which the annealing is performed by electric resistance heating.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: June 11, 2013
    Assignee: NHK Spring Co., Ltd.
    Inventors: Takashi Yajima, Hideki Okada, Katsuyuki Nishioka, Takeshi Furuse
  • METHOD FOR HEAT TREATMENT OF COILED SPRING
    Publication number: 20110232810
    Abstract: A method for heat treatment of a coiled spring includes cold forming a coiled spring, annealing the coiled spring after the cold forming, thereby removing of residual stress generated in the cold forming, in which the annealing is performed by electric resistance heating.
    Type: Application
    Filed: March 21, 2011
    Publication date: September 29, 2011
    Applicant: NHK SPRING CO., LTD.
    Inventors: Takashi YAJIMA, Hideki OKADA, Katsuyuki NISHIOKA, Takeshi FURUSE
  • High strength spring
    Patent number: 5258082
    Abstract: A spring steel containing 0.35 to 0.50% of carbon is refined to the hardness of .phi. 2.50 to 2.70 mm in Brinell indentation diameter (HBD) by rapid cooling for quenching and tempering. This spring steel is subjected to warm shot peening at a temperature of 150 to 300.degree. C. (423 to 573K) by using long-lived practical shots with the normal hardness of .phi. 2.65 to 2.80 mm in HBD, whereupon a high-strength spring is obtained having a compressive residual stress in its surface and enjoying the maximum shearing stress of 110 to 135 kgf/mm.sup.2 (1080 to 1325 MPa).
    Type: Grant
    Filed: February 25, 1993
    Date of Patent: November 2, 1993
    Assignee: NHK Spring Co., Ltd.
    Inventors: Hiroshi Koyama, Yasuo Sato, Katsuyuki Nishioka, Akira Tange, Tadayoshi Akutsu
  • Method for manufacturing a high-strength spring
    Patent number: 5225008
    Abstract: A spring steel containing 0.35 to 0.50% of carbon is refined to the hardness of .phi. 2.50 to 2.70 mm in Brinell indentation diameter (HBD) by rapid cooling for quenching and tempering. This spring steel is subjected to warm shot peening at a temperature of 150.degree. to 300.degree. C. (423 to 573 K.) by using long-lived practical shots with the normal hardness of .phi. 2.65 to 2.80 mm in HBD, whereupon a high-strength spring is obtained having a compressive residual stress in its surface and enjoying the maximum shearing stress of 110 to 135 kgf/mm.sup.2 (1080 to 1325 MPa).
    Type: Grant
    Filed: March 13, 1992
    Date of Patent: July 6, 1993
    Assignee: NHK Spring Co., Ltd.
    Inventors: Hiroshi Koyama, Yasuo Sato, Katsuyuki Nishioka, Akira Tange, Tadayoshi Akutsu