Patents by Inventor Tsutomu Hongo

Tsutomu Hongo 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).

  • Data recording disk chuck mechanism
    Patent number: 5014143
    Abstract: A disk chuck mechanism for chucking a disk in a stepped-down portion of a rotary chuck member and releasing the disk by vertically moving a chuck head coupled to an operating shaft is disclosed wherein a ring member having a cut in part is provided for its diameter to be enlarged opposite to the stepped-down portion of the rotary chuck member for chucking the disk and biased in the direction in which its diameter contracts. The chuck head is moved in the axial direction to utilize an inclined side face of the chuck head to enlarge the diameter of the ring member. With this arrangement, it is ensured that the disk is chucked in between the stepped-down portion of the rotary chuck member and the ring member with the one stroke movement of the chuck head.
    Type: Grant
    Filed: March 28, 1990
    Date of Patent: May 7, 1991
    Assignee: Hitachi Electronics Engineering Co., Ltd.
    Inventors: Kyoichi Mori, Kuniaki Toda, Nobuyuki Iizuka, Tsutomu Hongo, Tsutomu Nakadai