JPH0329589U

JPH0329589U -

Info

Publication number: JPH0329589U
Application number: JP8867989U
Authority: JP
Priority date: 1989-07-27
Filing date: 1989-07-27
Publication date: 1991-03-25

Description

[Brief explanation of drawings]

第１図〜第３図はこの考案の一実施例に係るオ
ーガヘツドを示し、第１図はスクリユウ板を切り
欠いてビツトの取付状態を示した平面図、第２図
はビツトの取付状態を示す部分斜視図、第３図は
ビツトによつて地盤を掘削する状態を示す部分斜
視図、第４図及び第５図はそれぞれビツトの刃先
部の形状を変更した他の実施例において、スクリ
ユウ板を切り欠いて各ビツトの取付状態を示した
平面図、第６図及び第７図は従来のオーガヘツド
の部分正面図及びスクリユウ板を切断してビツト
の取付状態を示した平面図である。符号の説明、１…ヘツド軸、２…スクリユウ板
、３…ビツト、３１…刃先部、３２…逃げ溝。 Figures 1 to 3 show an auger head according to an embodiment of this invention, Figure 1 is a plan view with the screw plate cut out to show how the bit is installed, and Figure 2 shows how the bit is installed. FIG. 3 is a partial perspective view showing the state in which the ground is excavated with a bit, and FIGS. 4 and 5 show other embodiments in which the shape of the cutting edge of the bit has been changed, and the screw plate is FIGS. 6 and 7 are a partial front view of a conventional auger head, and a plan view with the screw plate cut away to show how the bits are installed. FIGS. Explanation of symbols: 1...Head shaft, 2...Screw plate, 3...Bit, 31...Blade tip, 32...Escape groove.

Claims

[Claims for Utility Model Registration] 1. In an auger head in which a bit 3 is attached to the lower end of a screw plate 2 provided on the outer periphery of a head shaft 1, the maximum rotation locus of the cutting edge portion 31 at the tip of the bit 3 is the same as that of the screw plate. The bit 3 is attached to the lower end of the screw plate 2 so as to substantially match the rotation locus of the bit 2, and the cutting edge 31 at the tip of the bit 3 is formed to be perpendicular to the tangential direction of the rotation locus. The auger head. 2. The auger head according to claim 1, characterized in that an escape groove 32 is cut out at the inner bottom of the bit 3 from the cutting edge portion 31 at the tip of the bit 3 toward the attachment side to the screw plate 2. Ogre head.