JPH0428206U

JPH0428206U -

Info

Publication number: JPH0428206U
Application number: JP6952190U
Authority: JP
Priority date: 1990-06-29
Filing date: 1990-06-29
Publication date: 1992-03-06
Also published as: AU7831991A; AU641508B2

Description

[Brief explanation of the drawing]

第１図乃至第６図は本考案の実施例を示し、第
１図は５方向のビツト嵌合溝の作図説明図、第２
図はねじの平面図、第３図は５方向のビツト嵌合
溝の詳細な一部作図説明図、第４図はｒ＝Ｎ／８
の場合のビツト嵌合溝の作図説明図、第５図はｒ
＝Ｇ／２・（１−ｃｏｓβ）の場合のビツト嵌合
溝の作図説明図、第６図は６方向のビツト嵌合溝
の作図説明図であり、第７図乃び第８図は従来例
を示し、第７図はねじの平面図、第８図は他の例
のねじの平面図である。２……頭部、３……ビツト嵌合溝、３ａ……直
線部分、３ｂ……先端部分、Ａ……非トルク伝達
部、Ｂ……トルク伝達係止部。 1 to 6 show an embodiment of the present invention.
The figure is a plan view of the screw, Figure 3 is a detailed partially drawn explanatory diagram of the bit fitting groove in 5 directions, and Figure 4 is r = N/8.
Figure 5 is an explanatory drawing of the bit fitting groove in the case of r.
= G/2・(1-cosβ), FIG. 6 is a drawing explanatory drawing of the bit fitting groove in six directions, and FIGS. 7 and 8 are drawings of the conventional bit fitting groove. An example is shown; FIG. 7 is a plan view of the screw, and FIG. 8 is a plan view of another example of the screw. 2... Head, 3... Bit fitting groove, 3a... Straight portion, 3b... Tip portion, A... Non-torque transmission portion, B... Torque transmission locking portion.

Claims

[Claims for Utility Model Registration] (1) Consists of a threaded part and a head, with a bit fitting groove coaxial with the threaded part provided on the upper surface of the head;
This bit fitting groove is composed of a non-torque transmitting portion at a central position and five or six torque transmitting locking portions arranged at equal intervals and extending radially outward from the non-torque transmitting portion, and each torque The radial extension part of the transmission locking part has a straight line part parallel to the radius line, and the tip part of each torque transmission locking part is configured in a rounded shape. A screw characterized in that the tip portion is held at all heights and the bit fitting groove is configured in a tapered shape that gradually widens outward from the bottom surface toward the top surface. (2) Consisting of a threaded part and a head, a bit fitting protrusion coaxial with the threaded part is provided on the upper surface of the head, and this bit fitting protrusion is spaced equidistantly from the non-torque transmitting part at the center position. 5 or 6 torque transmitting locks disposed at positions extending radially outward from the non-torque transmitting portion, each torque transmitting lock having a radially extending portion parallel to the radial line. In addition to forming a straight line part, the tip of each torque transmission locking part is configured in a rounded shape, and the straight line part parallel to the radius line and the rounded tip part are held at all heights to form the bit fitting protrusion. A screw having a tapered shape that gradually widens outward from the top surface toward the bottom surface.