[특허]Screw having non-strip drive recess and driver bit for use with the screw

[미국특허] Screw having non-strip drive recess and driver bit for use with the screw 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B25B-023/00
출원번호	US-0856165 (2004-05-28)
우선권정보	JP-2003-155321(2003-05-30)
발명자 / 주소	Toyooka,Toshimasa Hamano,Shinichi
출원인 / 주소	Nitto Seiko Co., Ltd.
인용정보	피인용 횟수 : 7 인용 특허 : 12

초록 ▼

The present invention provides a screw, comprising a screw head having a drive recess and a screw shank having threads and being integrally formed with the screw head, wherein the drive recess includes a plurality of engaging grooves equiangularly radiating from an axis of the screw in plan view, a bottom face of each engaging groove having a steep slope, which is near to the screw shank, and a gentle slope, which is far from the screw shank, for enlarging the engaging area of the engaging grooves.

대표청구항 ▼

What is claimed is: 1. A screw, comprising: a screw head having a drive recess which is for engagement with a drive head of a driver bit; and a screw shank having threads and being integrally formed with the screw head, wherein the drive recess includes a plurality of engaging grooves equiangularly radiating from an axis of the screw in plan view, a cross section of a bottom face of each engaging groove cut along a plane including the axis of screw including a first straight line and a second straight line. a first portion of the first straight line is nearer to the screw shank than second straight line, and an inclination angle α of the second straight line to the axis of the screw is larger than an inclination angle β of the first straight line to the axis of the screw. 2. The screw of claim 1, wherein the inclination angle α is less than or equal to twice the inclination angle β. 3. The screw of claim 1, wherein when a depth of the drive recess in a direction of the axis is d, a height of a boundary between the first straight line and the second straight line from a starting point is within a range of 0.5d to 0. 7d, the starting point being at a deepest position in the drive recess. 4. A driver bit having a drive shaft and a drive head formed on a tip of the drive shaft, the drive head being for engagement with the drive recess of claim 1, the driver bit comprising: a plurality of engaging blades formed on the drive head so as to equiangularly radiate from an axis of the shaft in plan view, wherein a surface of each engaging blade including a ridge thereof has a first blade slope and a second blade slope, the first blade slope is nearer to the tip of the drive head, and an inclination angle of the second blade slope to the axis of the drive shaft is larger than an inclination angle of the first blade slope to the axis of the drive shaft. 5. The driver bit of claim 4, wherein when the drive head is engaged with the drive recess of claim 1, the surface of each engaging blade fits surfaces of the first straight line and the second straight line of each engaging groove included in the drive recess.

이 특허에 인용된 특허 (12) 인용/피인용 타임라인 분석

Totsu, Katsuyuki, Combination of screw and screw driver bit and header punch for its manufacture.
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Tolson John Thomas, High pressure glue injection device.
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Vaughn John (P.O. Box 3368 Granada Hills CA 91344), Method and apparatus for forming the head of a high torque fastener.
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Morgan Frank H., Recess drive bone screw and cooperable driving tool.
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Hughes Barry J. ; Mowins Michael L., Recessed head fastener and driver systems.
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Grady John H. (Wayland MA), Screw head with slant rib.
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Simmons ; Frederick A., Screw heads.
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Shinjo Katsumi,JPX, Screw with a recessed head and a driver bit engageable therewith.
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Lu Cheng Chuan,TWX, Screw with an improved head structure and punch for forming same.
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Edland, Jone, System comprising a screw and a tool therefor.
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Bisbing Robert H. (Springfield PA) Frame William R. (Brookhaven PA), Tamper-resistant fastener.
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Royle Ian A. (USA Technology 2000 ; 12503 Exchange Dr. ; Suite 536 Stafford TX 77477), Tube screw fastener.
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이 특허를 인용한 특허 (7) 인용/피인용 타임라인 분석

Chen,Hang Hui, Compound screwdriver head.
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Dilling, Gary, Fastener with friction engageable surface.
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Pritchard, Alan, Recessed head fastener and driver combination.
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Landsmann, Nils, Screw with a screw head which has a drive.
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Griffiths, Bryan, Screw-retaining screwdriver.
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Dilling,Gary, Spiral drive fastener with friction engageable surface.
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Ogawa, Nobuhiro; Yokoyama, Naoki, Structure of cross-shaped groove of screw for fit with driver bit.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Screw having non-strip drive recess and driver bit for use with the screw 원문보기