Patents by Inventor Norimichi Ebisawa

Norimichi Ebisawa 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).

  • Punch of blanking die including punch and die
    Patent number: 9630232
    Abstract: A punch constitutes, together with a die, a blanking die for punching a workpiece with a punching shape in which protrusions protrude outwards from an annular body. The punch includes a cylinder-shaped punch section and a holder section. In the punch section, a shape of the front end surface corresponding to the punching shape of the workpiece is continuous to a rear end surface, and includes a cutting edge on its front end surface. The holder section is a short cylinder including an inner circumferential surface formed in correspondence with an outer circumferential surface of the punch section to allow insertion of a rear part of the punch section. The protrusions are brought into intimate contact with the recesses of the holder section. A clearance is provided between a part of the punch section other than the protrusions and a part of the holder section other than the recesses.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: April 25, 2017
    Assignee: SHOWA PRECISION TOOLS CO., LTD.
    Inventors: Kenichi Ishikawa, Norimichi Ebisawa, Tomonari Hashiguchi
  • PUNCH OF BLANKING DIE INCLUDING PUNCH AND DIE
    Publication number: 20160375479
    Abstract: A punch constitutes, together with a die, a blanking die for punching a workpiece with a punching shape in which protrusions protrude outwards from an annular body. The punch includes a cylinder-shaped punch section and a holder section. In the punch section, a shape of the front end surface corresponding to the punching shape of the workpiece is continuous to a rear end surface, and includes a cutting edge on its front end surface. The holder section is a short cylinder including an inner circumferential surface formed in correspondence with an outer circumferential surface of the punch section to allow insertion of a rear part of the punch section. The protrusions are brought into intimate contact with the recesses of the holder section. A clearance is provided between a part of the punch section other than the protrusions and a part of the holder section other than the recesses.
    Type: Application
    Filed: October 21, 2015
    Publication date: December 29, 2016
    Inventors: Kenichi Ishikawa, Norimichi Ebisawa, Tomonari Hashiguchi