Source: https://patents.justia.com/patent/8075233
Timestamp: 2019-11-12 15:57:07
Document Index: 101126877

Matched Legal Cases: ['art 2', 'art 4', 'art 8', 'art 10', 'art 15', 'art 19', 'art 21', 'art\n2']

US Patent for Bolt, the axial force of which is to be determined by a supersonic wave, and a method for the manufacturing thereof Patent (Patent # 8,075,233 issued December 13, 2011) - Justia Patents Search
Justia Patents With Means To Indicate Application Of Predetermined Stress-strainUS Patent for Bolt, the axial force of which is to be determined by a supersonic wave, and a method for the manufacturing thereof Patent (Patent # 8,075,233)
Jul 15, 2008 - Meidoh Co., Ltd.
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.
Patent Literature 1 Patent Publication JP2007-301663 Patent Literature 2 Patent Publication JP2002-316235 Patent Literature 3 Patent Publication JP2002-113546
Further, the bottom 11 of said recess 4 between the inside perimeter of said recess 4 and the outside perimeter of said projection 5 is desirably set to incline at an angle θ for the upper face F of said bolt head 2, in the range of between +30 and −30 degrees. Further, the maximum depth d max of said recess 4 is desirably set to be less than ½ of the height h of said bolt head 2 (including said flange 10), but more desirably in the range of between about ⅙ and 1/10 of the height h of said bolt head 2.
1. bolt 1A bolt material 1B preliminary forged body 1C green bolt 2 bolt head 2A bolt head forming part 2B green bolt head 2C (bolt head) corner 3 shaft 3A shaft forming part 4 recess 4C (recess) corner 5 projection 6 plane (upper) face 7 thread 7A thread forming part 8(8A) plane (end) face 9 wall, the outside face of which being C face part 10 flange 11 bottom of recess 12 (cold forging machine) die 13 cylindrical cavity 14 plane (end) face molding part 15 punch used for preliminary forging 16 punch used for main forging 17 cavity (for bolt head) 18 bolt head upper face molding part 19A, 19B rolling die 20A, 20B thread rolling part 21A, 21B C-face forming part
2. A bolt in accordance with claim 1, wherein the diameter of the plane upper face of said projection formed on the inner side of said recess is set to be in the range of between ⅕ and ⅘ of the distance between one and the other side of the polygonal shaped outline of said recess in opposition to each other, with said wall of said bolt shaft end having an outside face set to incline at an angle α in the range of between 30 and 70 degrees.
3329057 July 1967 Salz
3718066 February 1973 Dally
4506917 March 26, 1985 Hansen
5029480 July 9, 1991 Kibblewhite
5220839 June 22, 1993 Kibblewhite
5913650 June 22, 1999 Daoud
6009759 January 4, 2000 Kibblewhite et al.
6712570 March 30, 2004 Kersten
2002-113546 April 2002 JP
2002-316235 October 2002 JP
2007-301663 November 2007 JP
Patent Publication Number: 20100014940
Assignees: Meidoh Co., Ltd. (Aichi), Hino Motors, Ltd. (Tokyo)
Inventors: Saburo Hasegawa (Aichi), Kimihiko Asao (Aichi), Koji Makino (Aichi), Takashi Kato (Aichi), Hideo Negishi (Hino)
Application Number: 12/218,537
Current U.S. Class: With Means To Indicate Application Of Predetermined Stress-strain (411/8); Including Gauge Means (411/14); Threaded Fastener Stress (73/761)