JPS5917464Y2 - Nosepiece of blind nut tightening tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blind nut fastening tool, and more particularly to the nosepiece of the tool.

The front end surface of the seven-piece piece of the conventional blind nut tightening tool is formed as a flat surface, and this surface presses against the flange surface of the blind nut.

A blind nut fastened to a panel or the like using a fastening tool of this conventional structure sometimes rotates with the bolt when the bolt is tightened and does not function as a fastening nut.

This is because both the panel hole and the blind nut are circular, so they have low resistance to rotation, and may rotate even if the tightening force between the nut flange and the expanded tubular portion is strong.

In extreme cases, a gap 3 may appear between the panel 1 and the blind nut 2, as shown in Figure 1.
Compared to the one without a gap, the rotation prevention force was even weaker.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a blind nut tightening tool having a nose piece that can strengthen the rotation prevention force of the blind nut against a panel member or the like.

In order to achieve this objective, according to the present invention, a mandrel is screwed onto a blind nut attached to a panel, etc., and the mandrel is rotated or retracted with the front end surface of the nosepiece pressing against the flange surface of the blind nut. In this blind nut tightening tool, the diameter of the tubular part of the blind nut is expanded on the back side of the panel to tighten the blind nut to the panel, etc., in which a hollow hole of the blind nut is provided in the front end surface of the nose piece. A blind nut fastening tool is provided, characterized in that a projection is provided that projects forward and outward of the tool from a position corresponding to slightly outside the inner diameter of the tool.

Therefore, as the nosepiece is strongly pressed against the blind nut by the mandrel, the protrusion enters the hollow hole of the blind nut while partially expanding it, so that the side surface of the blind nut is not circular but partially protrudes and comes into contact with the panel hole. As a result, the blind nut is fastened to the panel with a strong rotation-preventing force.

In an embodiment of the present invention, it is preferable that the nose piece is provided with an annular guide having an outer diameter slightly smaller than the inner diameter of the hollow hole of the blind nut, and a projection is formed on the side surface of this guide.

Preferably, a plurality of protrusions are provided around the annular guide, and each protrusion is tapered.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, the blind nut 2 is connected to the hole 4 in the panel 1.
The mandrel 5 of the blind nut tightening tool is screwed into the female thread of the nut 2.

Further, a nose piece 6 of the blind nut tightening tool is provided at the tip of the tool so as to support the mandrel 5.

In the present invention, the front end surface 8 of the nose piece 6 that presses the flange 7 of the blind nut 2 has a front end surface 8 that extends forward (downward in FIG. 2) and outward from a position corresponding to slightly outside the inner diameter of the hollow hole of the nut flange. A protruding protrusion 9 is provided.

It is preferable that a plurality of these protrusions 9 (four in the figure) be provided around the annular guide 10 provided at the front end of the nosepiece 6, and each protrusion tapers in both height and width toward the tip. It is preferable that it be formed.

The annular guide 10 of the nosepiece 6 has an inner diameter that rotatably and slidably supports the mandrel, has an outer diameter slightly smaller than the inner diameter of the hollow hole of the flange 7 of the blind nut, and has a length of It is smaller than the thickness of the panel 1 plus the thickness of the nut flange 7, which acts as a guide for the nut of the nosepiece (and thus of the mandrel).

3 to 5 show the state in which the blind nut 2 is fastened to the panel 1 by rotating or retracting the mandrel 5.

When the blind nut 2 is drawn in by the mandrel 5, the annular guide 10 of the nose piece 6 enters the hollow hole of the nut, and the tapered protrusion 9 partially expands the thin tubular portion of the nut 2.

Therefore, as shown in FIG. 5, the protrusion 11 partially formed on the side surface of the nut 2 is inserted into the hole 4 of the panel 1, and the blind nut 2 is fixed to the panel 1.

That is, the protrusion 11 acts to prevent the nut 2 from rotating within the panel 1.

Therefore, the blind nut is fastened to the panel with a strong rotation-preventing force, and even if the bolt is screwed into the fastened nut, it will not rotate together with the bolt.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an unfavorable example of the blind nut and panel after tightening, FIG. 2 is a side sectional view showing how the blind nut is tightened using the tool of the present invention, and FIG.
The figure is a side sectional view showing the nut when it is tightened, FIG. 4 is a side sectional view of the tightened nut, and FIG. 5 is a sectional view taken along the line v--v in FIG. 4. 1... Panel, 2... Blind nut, 4... Panel hole, 5... Mandrel, 6... Nose piece, 7... ...Nut flange, 8...Nosepiece front end surface, 9.
... Protrusion, 10 ... Annular guide.

Claims (3)

[Scope of utility model registration request] (1) Screw the mandrel onto the blind nut to which the panel, etc. is attached, and with the front end of the nosepiece pressing against the flange surface of the blind nut, rotate or pull the mandrel to tighten the tubular shape of the blind nut on the back side of the panel. In a blind nut tightening tool that tightens the blind nut to a panel or the like by expanding the diameter of the blind nut, the front end surface of the nose piece has a position slightly outside the inner diameter of the hollow hole of the blind nut. A blind nut tightening tool characterized by being provided with a protrusion that protrudes forward and outward from the tool. (2) The tool according to item 1, wherein the nose piece has an annular guide at the front end having an outer diameter slightly smaller than the inner diameter of the hollow hole of the blind nut, and the protrusion is provided on the outer surface of the guide. . (3) A plurality of the projections are provided around the annular guide, and each projection is tapered toward the tip of the second projection.
Tools listed in section.