Patents Assigned to Meidoh Co., Ltd.
  • Publication number: 20190309788
    Abstract: The objective is to provide a bolt which can more effectively suppress occurrence of seizure due to both oblique insertion and biting of foreign substances. The bolt includes a tapered surface, a guide portion, and a threaded portion in order from a distal end side and further includes a plurality of recesses provided on the tapered surface and a plurality of cutout portions provided at a distal end portion of the threaded portion.
    Type: Application
    Filed: November 30, 2017
    Publication date: October 10, 2019
    Applicant: MEIDOH CO., LTD.
    Inventors: Koji MAKINO, Masataka KONDO, Shungo MAKI, Akihiro FUTAMURA
  • Publication number: 20190257346
    Abstract: A bolt which can prevent seizure is provided due to the bolt being installed obliquely. A guide portion is formed between a groove portion formed at a distal end portion of the threaded portion and a surface end position on a base end side of the tapered surface, a starting end portion of the guide portion being an intersection between the surface end position on the base end side of the tapered surface and a helix according to the groove portion, a terminal end portion of the guide portion overlaps with the distal end portion of the threaded portion, an angle in the direction around the axis of the bolt from the starting end portion to the terminal end portion is set in the range of 90° to 360°.
    Type: Application
    Filed: October 25, 2017
    Publication date: August 22, 2019
    Applicant: MEIDOH CO., LTD.
    Inventors: Koji MAKINO, Masataka KONDO, Katsuhide TAKEI, Akihiro FUTAMURA, Shun NISHIMURA, Shungo MAKI
  • Patent number: 8075233
    Abstract: The object of the present invention is to provide a bolt, the axial force of which can be measured by a supersonic wave, or the like, with high accuracy and which can be manufactured in a shortened process. A bolt 1 having an angular polygonal shaped bolt head 2 is provided in the present invention. A recess 4 is formed on the bolt head 2 and a projection 5 having a plane upper face 6 is formed on the inner side of the recess 4, and at the end of the bolt shaft 3, a plane end face 8 is formed, and a wall, the outside of which being a C-face part is formed around the plane end face 8.
    Type: Grant
    Filed: July 15, 2008
    Date of Patent: December 13, 2011
    Assignees: Meidoh Co., Ltd., Hino Motors, Ltd.
    Inventors: Saburo Hasegawa, Kimihiko Asao, Koji Makino, Takashi Kato, Hideo Negishi
  • Patent number: 7762752
    Abstract: The object of the present invention is to provide a bolt that effectively prevents gouging, seizure and racing between the bolt and nut without the aid of a guide boss and is effective when combined with the case nut. The object can be attained by providing a bolt having a threaded shank portion wherein a plural number of notched faces slanting toward the end of the threaded shank portion at an angle ranging from ±15° to ±80° toward the axis of the threaded shank portion, are formed at the beginning of the thread part of the threaded shank portion.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: July 27, 2010
    Assignee: Meidoh Co., Ltd.
    Inventor: Takashi Kato
  • Patent number: 7670091
    Abstract: The object of the present invention is to provide a bolt that effectively prevents gouging, seizure and racing between the bolt and nut without the aid of a guide boss and is effective when combined with the case nut. The object can be attained by providing a bolt having a threaded shank portion wherein a plural number of notched faces slanting toward the end of the threaded shank portion at an angle ranging from ±15° to ±80° toward the axis of the threaded shank portion, are formed at the beginning of the thread part of the threaded shank portion.
    Type: Grant
    Filed: July 17, 2002
    Date of Patent: March 2, 2010
    Assignee: Meidoh Co., Ltd.
    Inventor: Takashi Kato
  • Patent number: 6685411
    Abstract: The object of the present invention is to dissolve effectively the problems of the encroaching, the seizure, and the racing. To attain said object, a bolt having a threaded shank portion wherein a notch slanting toward the end of said threaded shank portion at an angle in the range between 15° to 80° for the axis of said threaded shank portion is formed at the beginning of the complete thread part to expand the width of the entrance of the thread part of said thread shank portion is provided in the invention.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: February 3, 2004
    Assignee: Meidoh Co., Ltd.
    Inventor: Takashi Kato
  • Publication number: 20030072635
    Abstract: The object of the present invention is to provide a bolt that effectively prevents gouging, seizure and racing between the bolt and nut without the aid of a guide boss and is effective when combined with the case nut.
    Type: Application
    Filed: July 17, 2002
    Publication date: April 17, 2003
    Applicant: MEIDOH CO., LTD.
    Inventor: Takashi Kato
  • Patent number: 6540619
    Abstract: The object of the present invention is to prevent the encroaching and the seizure between the bolt and the female screw caused by an oblique screwing of the bolt into the female screw when the bolt and the female screw are fastened together. Another object of the present invention is to manufacture the bolt in a low cost, by using said bolt, the encroaching and the seizure between the bolt and the female screw caused by a oblique screwing of the bolt into the female screw are certainly prevented. Said objects may be attained by a bolt consisting of a column part and a polygonal pillar part extending from an end of said column part wherein a complete thread is formed on said column part and a screw blade continuing to said complete thread is formed on said polygonal pillar part.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: April 1, 2003
    Assignee: Meidoh Co., Ltd.
    Inventor: Takashi Kato
  • Publication number: 20020057954
    Abstract: The object of the present invention is to dissolve effectively the problems of the encroaching, the seizure, and the racing.
    Type: Application
    Filed: August 17, 2001
    Publication date: May 16, 2002
    Applicant: MEIDOH CO., LTD.
    Inventor: Takashi Kato
  • Publication number: 20020042302
    Abstract: The object of the present invention is to prevent the encroaching and the seizure between the bolt and the female screw caused by an oblique screwing of the bolt into the female screw when the bolt and the female screw are fastened together. Another object of the present invention is to manufacture the bolt in a low cost, by using said bolt, the encroaching and the seizure between the bolt and the female screw caused by a oblique screwing of the bolt into the female screw are certainly prevented. Said objects may be attained by a bolt consisting of a column part and a polygonal pillar part extending from an end of said column part wherein a complete thread is formed on said column part and a screw blade continuing to said complete thread is formed on said polygonal pillar part.
    Type: Application
    Filed: December 11, 2001
    Publication date: April 11, 2002
    Applicant: Meidoh Co., Ltd.
    Inventor: Takashi Kato
  • Patent number: 6347917
    Abstract: The object of the present invention is to prevent the encroaching and the seizure between the bolt and the female screw caused by an oblique screwing of the bolt into the female screw when the bolt and the female screw are fastened together. Another object of the present invention is to manufacture the bolt in a low cost, by using said bolt, the encroaching and the seizure between the bolt and the female screw caused by a oblique screwing of the bolt into the female screw are certainly prevented. Said objects may be attained by a bolt consisting of a column part and a polygonal pillar part extending from an end of said column part wherein a complete thread is formed on said column part and a screw blade continuing to said complete thread is formed on said polygonal pillar part.
    Type: Grant
    Filed: July 20, 2000
    Date of Patent: February 19, 2002
    Assignee: Meidoh Co., Ltd.
    Inventor: Takashi Kato
  • Patent number: 6296432
    Abstract: A bolt is provided in the present invention. When said bolt is screwed in a nut, said bolt is guided by engaging the spiral guide groove of said guide boss with the thread of the nut to prevent the encroaching, the seizure, or the racing between the bolt and the nut.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: October 2, 2001
    Assignee: Meidoh Co., Ltd.
    Inventor: Takashi Kato