Patents Assigned to Yoshino Seiki Inc.
  • Expansion anchor
    Patent number: 5401131
    Abstract: An expansion anchor including an anchor stem having a holding flange and a lock member having a corrugated portion is inserted into a fitting hole bored in concrete or another rigid material. The anchor is secured in the bore by forcing the lock member to squash the corrugated portion. The corrugated portion thus squashed expands into engagement with the inner surface defining the bore so that the expansion anchor is steadily secured in a non-removable state.
    Type: Grant
    Filed: July 9, 1993
    Date of Patent: March 28, 1995
    Assignee: Yoshino Seiki Inc.
    Inventor: Yousuke Yoshino
  • Repair method for exterior on a concrete structure
    Patent number: 5129135
    Abstract: An exterior material, such as a tile, which is likely to flake due to cracks or other possible defects in the wall base of a concrete structure, can be effectively repaired by boring an anchor hole extending from the surface of the exterior material to the concrete wall base, and inserting and expanding an expansion anchor bolt in the anchor hole. By using a drilling device capable of spouting out a cooling fluid while drilling, even hard nonmetallic material, such as ceramic tile, can be effectively bored to form a suitable anchor hole.
    Type: Grant
    Filed: June 18, 1991
    Date of Patent: July 14, 1992
    Assignee: Yoshino Seiki Inc.
    Inventor: Yousuke Yoshino
  • Expansion anchor
    Patent number: 5116176
    Abstract: An expansion anchor capable of being expanded by thrusting a lock plug into a contacted portion to spread a clamp member having acutely angular peripheral edges. When the anchor is expanded within a hole in a rigid material such as concrete, the angular edges of the clamp member bite into the rigid material, so that the anchor is no longer removable from the rigid material.
    Type: Grant
    Filed: June 19, 1991
    Date of Patent: May 26, 1992
    Assignee: Yoshino Seiki Inc.
    Inventor: Yoshino Yousuke
  • Mist-spouting type drilling device
    Patent number: 5004382
    Abstract: Atomized water is produced by an atomizer mounted on a drilling device and introduced through a mist flow passage formed in a hollow drill. By applying the atomized water flowing from the atomizer to a cutting bit at the leading end of the drill through the mist flow passage, the cutting bit heated and reaching a high temperature in drilling is cooled. Thus, a rigid material of concrete or the like can be efficiently drilled without being stained with wetting.
    Type: Grant
    Filed: March 7, 1990
    Date of Patent: April 2, 1991
    Assignee: Yoshino Seiki Inc.
    Inventor: Yousuke Yoshino
  • Drill
    Patent number: 4854788
    Abstract: A drill comprising a drill shank having a taper portion adjacent to a threaded portion provided on the rear or basal portion of the shank. When the drill is screwed into an axial hole in a drill holder of a drilling machine, the opening edge or inner tapered wall of the axial hole of the drill holder bites into the taper portion of the drill shank, consequently to bring the drill into firm connection with the drill holder of the drilling machine.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: August 8, 1989
    Assignees: Nikken Tool Co., Ltd., Yoshino Seiki Inc.
    Inventor: Hiroaki Okinaga