JPS622817U

JPS622817U -

Info

Publication number: JPS622817U
Application number: JP9303785U
Authority: JP
Priority date: 1985-06-21
Filing date: 1985-06-21
Publication date: 1987-01-09

Description

[Brief explanation of the drawing]

第１図は、この考案の一実施例アプセツト形ボ
ルト頭部の平面図、第２図は、第１図のボルト頭
部の一部破断縦断面図、第３図は、従来型アプセ
ツト形ボルトの一部破断斜視図、第４図は、他の
従来型アプセツト形ボルトの一部破断斜視図、第
５図は、さらに別の従来型アプセツト形ボルトの
一部破断斜視図である。〔符号の説明〕１……アプセツト形ボルト、３
……ボルト頭部、４……ボルト軸線、５……外周
正六角形、６……外側平坦駆動面、７……頂面、
８……係合穴、９……角部、１０……半円筒面、
１１……円筒軸線、１２……対角線、１３……内
周正六角形、１４……内側平坦駆動面、１５……
中間傾斜面、１６……逆円錐斜面、１７……底面
、１８……対角線、１９……対角線、２０……斜
面。 Fig. 1 is a plan view of an upset-type bolt head according to an embodiment of this invention, Fig. 2 is a partially cutaway vertical sectional view of the bolt head of Fig. 1, and Fig. 3 is a conventional upset-type bolt head. FIG. 4 is a partially cut-away perspective view of another conventional upset-type bolt, and FIG. 5 is a partially cut-away perspective view of still another conventional upset-type bolt. [Explanation of symbols] 1... Upset type bolt, 3
... Bolt head, 4 ... Bolt axis, 5 ... Regular hexagonal outer periphery, 6 ... Outer flat driving surface, 7 ... Top surface,
8...Engagement hole, 9...Corner, 10...Semi-cylindrical surface,
11... Cylindrical axis line, 12... Diagonal line, 13... Inner periphery regular hexagon, 14... Inner flat driving surface, 15...
Intermediate slope, 16... Inverted conical slope, 17... Bottom, 18... Diagonal, 19... Diagonal, 20... Slope.

Claims

[Claims for Utility Model Registration] 1. A bolt head surrounded by n outer flat drive surfaces located on one side of a regular n-gon shape with the bolt axis as its center and arranged parallel to the bolt axis. In an upset bolt having an engagement hole in the top surface, the engagement hole is n semi-cylindrical surfaces arranged close to each corner of the regular n-gonal outer periphery of the bolt head. , the cylindrical axis of the semi-cylindrical surface intersects with the diagonal of an arbitrary regular n-gon centered on the bolt axis, and is adjacent to the n semi-cylindrical surfaces arranged parallel to the bolt axis. n inner flat drive surfaces disposed at positions on each side of an inner circumferential regular n-gon centered on the bolt axis, which are provided between each pair of semi-cylindrical surfaces parallel to the bolt axis; , defined by the n inner flat driving surfaces and the bottom surface continuous to the lower ends of the n semi-cylindrical surfaces, and the position of the diagonal of the inner circumferential regular n-gon is defined by the arbitrary positive n of the inner circumferential regular n-gons intersected by the cylindrical axis. An upset-type bolt characterized in that the bolt is disposed at an appropriately small angle in the screwing direction of the bolt with respect to the diagonal of the square. 2. The upset bolt according to claim 1, wherein the angular displacement of the inner circumferential regular n-gon with respect to the diagonal of the arbitrary regular n-gon that the cylindrical axis intersects is approximately 3°. 3. According to claim 2 or 3, the position of the diagonal line of the arbitrary regular n-gon where the cylinder axis intersects is made to coincide with the position of the diagonal line of the outer regular n-gon. Upset type bolt. 4. According to claim 1, 2, or 3, the depth of the bottom surface of the engaging hole is greater than 12 times the thickness of the bolt head. upset type bolt. 5. The upset bolt according to claim 1, 2, 3, or 4, wherein the arbitrary number n is 6.