Patents by Inventor Atsushi Sumimoto

Atsushi Sumimoto 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).

  • Piston pump assembly having a cylinder member with strain-absorbing portions
    Patent number: 8388326
    Abstract: A piston pump assembly includes a first pump having a first cylinder member inserted in a piston hole of a pump housing, and a first piston inserted in the first cylinder member, and a second pump having a second cylinder member inserted in the piston hole, and an annular second piston slidably fitted in an annular groove formed in the outer periphery of the first piston, and also axially slidably inserted in the second cylinder member. The first cylinder member axially presses the second cylinder member, thereby preventing the second cylinder member from being dropped out of the piston hole. The second cylinder member has an annular seal surface in contact with a shoulder surface formed on the inner periphery of the piston hole. Strain-absorbing protrusions are formed on the end of the second cylinder member in abutment with the first cylinder member. The protrusions are compressed when they are pressed by the first cylinder member.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: March 5, 2013
    Assignee: Advics Co., Ltd.
    Inventors: Atsushi Sumimoto, Tomoo Harada
  • PISTON PUMP ASSEMBLY
    Publication number: 20110070112
    Abstract: A piston pump assembly includes a first pump having a first cylinder member inserted in a piston hole of a pump housing, and a first piston inserted in the first cylinder member, and a second pump having a second cylinder member inserted in the piston hole, and an annular second piston slidably fitted in an annular groove formed in the outer periphery of the first piston, and also axially slidably inserted in the second cylinder member. The first cylinder member axially presses the second cylinder member, thereby preventing the second cylinder member from being dropped out of the piston hole. The second cylinder member has an annular seal surface in contact with a shoulder surface formed on the inner periphery of the piston hole. Strain-absorbing protrusions are formed on the end of the second cylinder member in abutment with the first cylinder member. The protrusions are compressed when they are pressed by the first cylinder member.
    Type: Application
    Filed: September 15, 2010
    Publication date: March 24, 2011
    Applicant: ADVICS CO., LTD.
    Inventors: Atsushi Sumimoto, Tomoo Harada