Patents Assigned to Horikiri Spring Mfg. Co., Ltd.
  • Method of preparing a leaf spring
    Patent number: 5100482
    Abstract: A method of preparing a leaf spring having a heating step in which a raw material of a leaf spring is heated to austenite range temperature, a rolling step in which the above heated material is formed to a desirable shape, a working step in which the above rolling material is cut to a fixed length to form a chip hole, a bolt hole or the like, and a cooling step in which a camber is given to the above working material to cool to hardening in his state.Other five modified methods are also described.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: March 31, 1992
    Assignee: Horikiri Spring Mfg., Co., Ltd.
    Inventors: Tadanori Tanaka, Masao Nakamura, Toshifumi Yamada, Katuhyosi Takase, Kazuhiro Muramatsu, Tosikazu Ebata
  • Leaf spring construction
    Patent number: 4637594
    Abstract: A leaf spring construction employs tapered leaf elements made from a steel sheet, where at least the tapered portion of the leaf elements have an arcuate shape in transverse cross-section with a convex surface on the tension side and a concave surface on the compression side thereof.
    Type: Grant
    Filed: October 28, 1982
    Date of Patent: January 20, 1987
    Assignees: Horikiri Spring Mfg. Co., Ltd., Aichi Steel Works, Ltd., Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Tsutomu Saito, Yoshimichi Hasegawa, Kazuo Yoshikawa, Shigetsune Aoyama