JPS6312734U

JPS6312734U -

Info

Publication number: JPS6312734U
Application number: JP7294387U
Authority: JP
Priority date: 1987-05-18
Filing date: 1987-05-18
Publication date: 1988-01-27
Also published as: JPH028188Y2

Description

[Brief explanation of the drawing]

第１図は、本考案に従つて構成された締結軸力
計測具の一具体例を示す一部切欠いた正面図。第
２図は、第１図に示す締結軸力計測具の締結ボル
トを示す一部切欠いた正面図。第３図は、第１図
に示す締結軸力計測具の芯体を示す正面図。第４
図は、第３図の―線による断面図。第５図は
、本考案に従つて構成された締結軸力計測具の変
形例を示す一部切欠いた正面図。第６図は、締結
軸力計測具における芯体の変形例の一部を示す一
部切欠いた図。２及び２′……締結軸力計測具、４……締結ボ
ルト、６……芯体、１２……貫通孔、２８……歪
ゲージ、３２……接続端子。 FIG. 1 is a partially cutaway front view showing a specific example of a fastening axial force measuring instrument constructed according to the present invention. 2 is a partially cutaway front view showing a fastening bolt of the fastening axial force measuring instrument shown in FIG. 1; FIG. FIG. 3 is a front view showing the core of the fastening axial force measuring instrument shown in FIG. 1. Fourth
The figure is a sectional view taken along the line - in FIG. FIG. 5 is a partially cutaway front view showing a modification of the fastening axial force measuring instrument constructed according to the present invention. FIG. 6 is a partially cutaway diagram showing a modified example of the core in the fastening axial force measuring instrument. 2 and 2'... fastening axial force measuring device, 4... fastening bolt, 6... core body, 12... through hole, 28... strain gauge, 32... connecting terminal.

Claims

[Claims for Utility Model Registration] 1. A bolt with an axial through hole formed in the shaft center, and a bolt with an axial through hole formed in the shaft center so that when an axial force is applied to the bolt, an axial stress is generated accordingly. In a fastening axial force measuring device comprising a core assembled in a hole and at least one strain gauge attached to the outer peripheral surface of the core; the core is in a state where a tensile preload is applied. A fastening axial force measuring instrument, which is assembled into the through hole of the bolt, and both ends of the core body are fixed to the bolt by welding. 2. The fastening axial force measuring instrument according to claim 1, wherein the core body is made of a material that is substantially the same as the material of the bolt or a material that has a tensile strength greater than that material. 3. The core has a large diameter head and a shaft extending from the head, the head is fixed to one end of the bolt by welding, and the tip of the shaft is attached to the other end of the bolt. The fastening axial force measuring instrument according to claim 1 or 2 of the utility model registration claim, which is fixed by welding. 4. A utility model in which a recess with a shape corresponding to the shape of the head of the core is formed in the one end of the bolt, and the head of the core is positioned and fixed within the recess. A fastening axial force measuring instrument according to registered claim 3. 5. The fastening shaft according to claim 3 or 4 of the utility model registration claim, wherein a small diameter portion is formed in the shaft portion of the core, and the strain gauge is affixed to the outer peripheral surface of the small diameter portion. Force measuring instrument. 6. The outer diameter of the shaft of the core is slightly smaller than the inner diameter of the through hole, and the lead wire of the strain gauge extends along the outer circumferential surface of the shaft to the lower surface of the head, and then extends to the lower surface of the head. extending to the upper surface of the head through a guide groove formed on the lower surface and a groove formed on the outer peripheral surface of the head,
The fastening axial force measuring instrument according to any one of claims 3 to 5, which is connected to a connection terminal provided on the upper surface of the head.