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1. 发明专利

CA1110092A ENTERING END PORTION OF DRILL SCREW 未知
公开(公告)号：CA1110092A
公开(公告)日：1981-10-06
申请号：CA319106
申请日：1979-01-04
申请人： YAMASHINA SEIKOSHO KK
发明人： SANO NARIAKI , AMANO TETSUO
IPC分类号： F16B25/10 , F16B25/00
摘要： ENTERING END PORTION OF DRILL SCREW A drill screw having an integral driving shank, head, and entering end portion. The shank has formed on it thread convolutions of uniform outer and root diameters. The entering end portion has a cylindrical portion coaxial with the shank provided with two flutes inclined with respect to the center axis of the cylindrical portion and disposed on opposite sides of it, and end surfaces of a roof-shape. Each of the flutes includes conical flute surfaces. The intersection of each of the conical flute surfaces and each of the end surfaces forms a cutting edge. And each of the conical flute surfaces forms a rake angle with respect to one of the cutting edges, while each of the end surfaces forms a relief angle with respect to one of the cutting edges. In a preferred construction, each flute surface includes a cylindrical surface having an axis parallel to one of the end surfaces and a conical flute surface smoothly contiguous with the cylindrical surface. The intersection of each of the cylindrical surfaces and each of the end surfaces forms a cutting edge. Each of the cylindrical surfaces forms a rake angle with respect to one of the cutting edges, while each of the end surfaces forms a relief angle with respect to one of the cutting edges. In another preferred construction, each of the flute surfaces is made up of a plane surface and a substantially conical flute surface contiguous with the plane surface. The intersection of each of the plane surfaces and each of the end surfaces forms a cutting edge, and each of the plane surfaces forms a rake angle with respect to one of the cutting edges, while each of the end surfaces forms a relief angle with respect to one of the cutting edges.

2. 发明专利

AU525246B2 ENTERING END PORTION OF DRILL SCREW 未知
公开(公告)号：AU525246B2
公开(公告)日：1982-10-28
申请号：AU4338679
申请日：1979-01-15
申请人： YAMASHINA SEIKOSHO KK
发明人： SANO NARIAKI , AMANO TETSUO
IPC分类号： F16B25/10 , F16B25/00

3. 发明专利

DE2901059A1 未知
公开(公告)号：DE2901059A1
公开(公告)日：1979-07-26
申请号：DE2901059
申请日：1979-01-12
申请人： YAMASHINA SEIKOSHO KK
发明人： SANO NARIAKI , AMANO TETSUO
IPC分类号： F16B25/10 , F16B25/00

4. 发明专利

JPH01284454A MOLDING TOOL OF DRILL POINT AND MOLDED GOODS FORMED BY MOLDING TOOL 失效
公开(公告)号：JPH01284454A
公开(公告)日：1989-11-15
申请号：JP11541088
申请日：1988-05-11
申请人： YAMASHINA SEIKOSHO KK
发明人： SANO NARIAKI
IPC分类号： B23B51/00 , B21J13/02 , B21K5/04 , B23P15/32
摘要： PURPOSE:To increase the metal density of a cutting edge part and to prevent the microchipping at the tip of a cutting edge by projecting a specific step part to the corner part consisting of the inner side face where the molding recess of butt surfaces form the cylindrical part of a drill point and the base forming a sloped end face. CONSTITUTION:The step part 17 is formed to the corner part consisting of the inner side face 13 and base 14of the molding recess 12. Namely, the step part 17 has a ridge line part 17a approximately parallel with an end edge 14a forming the cutting edge 27a of the drill point 25 and is continuous to a bulging part 15. The cutting edge 27a is formed from the start point V3 of the bulging part 15 positioned upper by 45%+ or -10% of the drill diameter (d)which is the major diameter of the inner side face 23 from the intersected point V1 of the end edge 14b forming a chisel edge 27b and an axial center 30. Further, a drill cylindrical diameter d1 which is the minor diameter of the inner side face 13 of the butted molding dies 10, 11 is the same as or larger than the diameter d2 of a work piece 20. The step part 17 provided to the recess 12, therefore, controls the rotating direction of the work piece 20 and the escape of the material in the upper direction, thereby increasing the density of the metal structure of the cutting edge part and preventing the microchipping at the tip of the edge at the time forging.

5. 发明专利

JP2577434B2 失效
公开(公告)号：JP2577434B2
公开(公告)日：1997-01-29
申请号：JP11541088
申请日：1988-05-11
申请人： YAMASHINA SEIKOSHO KK
发明人： SANO NARIAKI
IPC分类号： B23B51/00 , B21J13/02 , B21K5/04 , B23P15/32

6. 发明专利

JPH11325026A AIRTIGHT FIXING DEVICE 失效
公开(公告)号：JPH11325026A
公开(公告)日：1999-11-26
申请号：JP13304298
申请日：1998-05-15
申请人： YAMASHINA SEIKOSHO KK
发明人： FUKUTANI TOSHIAKI , SANO NARIAKI
IPC分类号： F16B35/04
摘要： PROBLEM TO BE SOLVED: To ensure a firm caulking fixation without air leakage from a caulking hole of a thin plate. SOLUTION: Caulking means 23 is constituted by sequentially forming a seat 24, a projection for preventing idling while extending radially from the outer circumferential edge of the seat 24, an annular groove 26 whose outer diameter is smaller than that of the seat 24, and a flange 27 whose outer diameter is almost the same as the inner diameter of a caulking hole while it is larger than that of the groove 26.

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