Threaded-fastener wrenching structure, threaded fastener and wrenching tool
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B25B-013/06
B25B-013/00
B25B-023/16
B25B-023/00
F16B-023/00
F16B-035/06
F16B-035/04
출원번호
US-0478843
(2002-05-27)
우선권정보
JP-2001-159973(2001-05-29)
국제출원번호
PCT/JP02/005120
(2002-05-27)
§371/§102 date
20031124
(20031124)
국제공개번호
WO02/097286
(2002-12-05)
발명자
/ 주소
Yamamoto,Kouzou
출원인 / 주소
OSG Corporation
대리인 / 주소
Oliff &
인용정보
피인용 횟수 :
10인용 특허 :
4
초록▼
A threaded fastener capable of being reduced in size and weight. A pair of side wall surfaces of each of six radially outwardly projecting, torque transmitting portions lie on straight lines passing through the center line in a cross section perpendicular to the center line so as to transmit torque
A threaded fastener capable of being reduced in size and weight. A pair of side wall surfaces of each of six radially outwardly projecting, torque transmitting portions lie on straight lines passing through the center line in a cross section perpendicular to the center line so as to transmit torque through the side wall surface, whereby the direction of a surface orthogonal force N applied to a force-applied point P by a wrenching tool coincides with the direction of an effective wrenching force F. This arrangement reduces an operation force required for rotating the wrenching tool and accordingly the load acting on each of the torque transmitting portions, in comparison with a conventional hexagonal head. That is, it is possible to reduce the diameter of the head portion of the threaded fastener and the size and weight of the head portion, while avoiding deformation of the side wall surfaces through which the torque is transmitted.
대표청구항▼
The invention claimed is: 1. A threaded-fastener wrenching structure, comprising: a fitting hole which is provided in one of a threaded fastener and a wrenching tool for wrenching said threaded fastener; and a fitting protrusion which is provided in the other of said threaded fastener and said wren
The invention claimed is: 1. A threaded-fastener wrenching structure, comprising: a fitting hole which is provided in one of a threaded fastener and a wrenching tool for wrenching said threaded fastener; and a fitting protrusion which is provided in the other of said threaded fastener and said wrenching tool and which is to be brought into fitting engagement with said fitting hole; wherein: each of said fitting hole and protrusion has a contour having a plurality of torque transmitting portions which are equi-angularly spaced apart from each other about a center line of said each of said fitting hole and protrusion and which project outwardly in a radial direction of said each of said fitting hole and protrusion, so that a wrenching torque is transmitted through said torque transmitting portions to said threaded fastener, as a result of rotation of said wrenching tool about said center-line when said fitting hole and protrusion are held in fitting engagement with each other; each of said torque transmitting portions has an engaging portion through which the wrenching torque is transmitted to said threaded fastener, wherein a tangent line tangent to said engaging portion substantially coincides with a straight line passing through said center line in a cross section perpendicular to said center line; said threaded fastener has an external thread; said fitting protrusion is provided in said threaded fastener; and said fitting protrusion has a maximum diameter Dmax, a minimum diameter Dmin and a height k as measured in a direction parallel with said center line such that said maximum diameter Dmax, said minimum diameter Dmin and said height k satisfy the following expressions (4), (5) , (6) which represent relationships with a major diameter d of said external thread: D max≦1.5d (4) 1.1d< Dmin (5) 0.3 d≦k<0.45d (6). 2. The threaded-fastener wrenching structure according to claim 1, wherein an intersection angle between said tangent line and said straight line passing through said center line is no more than + 3째 and no less than-3째. 3. The threaded-fastener wrenching structure according to claim 1, wherein an intersection angle between said tangent line and said straight line passing through said center line is no more than + 1째 and no less than-1째. 4. The threaded-fastener wrenching structure according to claim 1, wherein said plurality of torque transmitting portions consist of five or six torque transmitting portions. 5. The threaded-fastener wrenching structure according to claim 1, wherein said engaging portion is a flat surface having a predetermined dimension as measured in a direction of said tangent line. 6. A threaded fastener, having an external thread, and provided with the fitting protrusion defined in claim 1. 7. The threaded-fastener wrenching structure according to claim 1, wherein said fitting protrusion is provided in said threaded fastener and a central angle θ1 of each of said torque transmitting portions and a central angle θ2 of a portion of said contour between each adjacent pair of said torque transmitting portions satisfy the following expression (7) : 1. 3≦θ1/θ2≦1.4 (7). 8. A threaded-fastener wrenching structure, comprising: a fitting hole which is provided in one of a threaded fastener and a wrenching tool for wrenching said threaded fastener; and a fitting protrusion which is provided in the other of said threaded fastener and said wrenching tool and which is to be brought into fitting engagement with said fitting hole; wherein: each of said fitting hole and protrusion has a contour having a plurality of torque transmitting portions which are equi-angularly spaced apart from each other about a center line of said each of said fitting hole and protrusion and which project outwardly in a radial direction of said each of said fitting hole and protrusion, so that a wrenching torque is transmitted through said torque transmitting portions to said threaded fastener, as a result of rotation of said wrenching tool about said center line when said fitting hole and protrusion are held in fitting engagement with each other; each of said torque transmitting portions has: an engaging portion through which the wrenching torque is transmitted to said threaded fastener, wherein a tangent line tangent to said engaging portion substantially coincides with a straight line passing through said center line in a cross section perpendicular to said center line; and a radial outer end surface which is provided by a part of a cylindrical surface whose center is said center line; said threaded fastener has an external thread; said fitting protrusion is provided in said threaded fastener; and said fitting protrusion has a maximum diameter Dmax, a minimum diameter Dmin and a height k as measured in a direction parallel with said center line such that said maximum diameter Dmax, said minimum diameter Dmin and said height k satisfy the following expressions (4), (5) , (6) which represent relationships with a major diameter d of said external thread: D max≦1.5d (4) 1.1d< Dmin (5) 0.3 d≦k<0.45d (6). 9. The threaded-fastener wrenching structure according to claim 8, wherein a portion of said contour between each circumferentially adjacent pair of said torque transmitting portions defines a groove which has a pentagonal shape in a cross section perpendicular to said center line. 10. The threaded-fastener wrenching structure according to claim 8, wherein a portion of said contour between each circumferentially adjacent pair of said torque transmitting portions defines a groove which has a U shape in a cross section perpendicular to said center line.
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이 특허에 인용된 특허 (4)
McBride Arlen P. (4591 S. Main St. Rd. New Castle IN 47362), Concrete anchoring device and method.
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