JPS6323611Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention is used in architecture to fasten objects with an effective and appropriate fastening force by tightening screws. machine,
It is used in other fields.

Conventional technology Bolt. Nut-based fastening devices have been widely used in the past, but since it is difficult to tighten properly, it is difficult to tighten them properly, which can lead to loosening due to insufficient tightening, or breakage of bolts due to over-tightening, which cannot be easily avoided. It's something that doesn't exist.

Purpose of the invention The purpose of this invention is to address these conventional problems.The purpose of this invention is to reduce the axial force generated in the bolt by the wedge action of the tapered surface when a screw is fastened using a special tapered washer. The purpose is to provide an axial force indicating bolt/nut that can be extracted by expanding the diameter of the washer, allowing for proper tightening and loosening prevention functions. The object of the present invention is to provide an axial force indicating bolt/nut which is made into one assembled product by combining the washer and the jacket body inseparably.

Configuration Therefore, in this invention, an inner washer with a tapered surface on the outer periphery and an outer jacket body with a tapered surface on the inner periphery are placed on the seat surface of the bolt or nut body, and both tapered surfaces are in contact with each other. An engaging body is provided at the upper end of the outer periphery of the jacket body to engage and hold the flange portion of the bolt or nut body to combine the three parts into one.

Embodiments Embodiment 1 FIG. 1 shows the case where the present invention is applied to a nut body. In the figure, 1 is a nut body having a flange portion 2 at the lower end and a screw hole 1a at the center. Reference numeral 3 denotes an inner washer having a tapered surface 3a tapered downward on its outer peripheral surface, and its upper surface is joined to the flange seat surface 2a of the nut body 1 in a face-to-face manner. Reference numeral 4 denotes a mantle having a tapered surface 4a tapering downward on its inner periphery, and an annular engagement body 5 is integrally formed at the upper end of its outer periphery. Inner washer 3
Then, the mantle 4 is fitted and attached to the flange seat surface 2a of the nut body 1 with the tapered surfaces 3a, 4a in contact with each other, and in this state, the engaging body 5 formed at the upper end of the mantle 4 is bent inward to form the flange. The nut body 1, the inner washer 3, and the outer jacket body 4 are combined into one by engaging and holding the nut body 1 with the part 2. The nut body 1 and the inner washer 3 are brought into spherical contact to improve stability.

Embodiment 2 FIG. 2 shows the case where the present invention is applied to a bolt body. In the figure, reference numeral 10 denotes a rectangular bolt head which integrally includes a flange portion 2 and a bolt screw shaft 11. The inner washer 3 having a tapered surface 3a and the outer mantle 4 having a corresponding tapered surface 4a are fitted and attached to the flange portion 2, and the engaging body 5 formed at the upper end of the mantle 4 is engaged with the flange portion 2. The binding is the same as in Example 1 above.

In the case of the nut body of the first embodiment, the screw shaft 7a of the bolt 7 is passed through the object 6 to be fastened, and the nut body 1 is screwed onto the screw shaft and fastened.

In the case of the second embodiment, the threaded shaft of the bolt body is screwed into the screw hole 9 of the object to be fastened 8, and the objects are fastened as they are. When fastened, the inner washer 3 and the outer mantle 4 are strongly pressed against the seat surface 2a by sliding contact between the tapered surfaces 3a and 4a, so as the fastening force increases, an axial force (tensile force) acts on the screw shaft. This axial force causes the diameter of the mantle 4 to expand due to the wedge action of the tapered surface, so the axial force can be determined by measuring the degree of diameter expansion.

Effects of the device As described above, this device fits and attaches the inner washer and the outer mantle by bringing their tapered surfaces into contact with the seating surface of the bolt or nut body, and also attaches an annular engagement body to the upper end of the mantle. Since it is configured so that it is engaged and held by the flange part, the three parts are joined together to form an assembly. Therefore, when tightening, the nut body, washer, etc. are individually fitted onto the bolt screw shaft, and the nut is tightened. It saves you the hassle of having to conclude the contract with
Work can be done easily and quickly with one touch. However, as the outer diameter of the mantle expands as it is tightened, the screw tightening force, that is, the axial force, can be immediately determined by measuring the degree of expansion with a gauge. It is effective and can be implemented easily and inexpensively.

[Brief explanation of the drawing]

FIG. 1 is a side view of a first embodiment of the present invention showing the state in which it is used, and FIG. 2 is a side view of the second embodiment, both partially showing cross sections. 1... Nut body, 2... Flange part, 3... Inner washer,
4... Mantle body, 5... Engaging body, 10... Bolt head.

Claims (1)

[Scope of utility model registration request] An inner washer with a tapered surface on the outer periphery and an outer mantle with a tapered surface on the inner periphery are fitted and spliced on the seat surface of the bolt or nut body, with both tapered surfaces touching each other, and the upper edge of the outer periphery of the mantle is attached. An axial force indicating bolt/nut, characterized in that an engaging body is provided at the flange portion of the bolt or nut body to engage and hold the flange portion of the bolt or nut body to combine the three parts into one.