JPS6231687Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a mounting structure using a floating nut.

When connecting two members with bolts and nuts, under conditions where the nut cannot be welded to the first member and the nut cannot be held down from above, the nut 42 as shown in FIG.
A floating nut 41 is used in which a plate 43 having a U-shaped cross section is fixed by welding to the lower surface of the nut.

That is, the plate 43 is bent 44 at the middle part to form a U-shaped cross section, and between the leg part 45 in the lower half and the nut fixing part 47 in the upper half, the first plate 43 is bent as shown in FIG. The member 51 is held between the leg portions 45 and the nut fixing portion 47, and the distance between the open ends thereof is small, and the first member 51 is held between the open ends.

When connecting the second member 55 to the first member 51 using such a conventional floating nut 41, the second member 55 is connected to the leg portion 45 as shown in FIG.
Since the nut 42 comes into contact with the lower surface of the nut 42, the nut 42 is tilted as shown in the figure. Since the leg portion 45 of the floating nut 41 is sandwiched between the two members 51 and 55 in this way, when a bolt (not shown) is screwed into the nut 42 from below, the thread of the nut 42 is raised due to the inclination of the nut 42. , the position of the nut 42 may be misaligned, and the tightening torque becomes unstable due to the presence of the leg portion 45, which is a spring portion.

This idea was created in view of the above problems.
The purpose of this is to prevent the nut from tilting, prevent the thread from going up, prevent the nut from slipping, facilitate position adjustment, and further stabilize the tightening torque. Provides a mounting structure using mounting nuts.

In order to achieve such an object, the present invention constructs a floating nut by fixing to a nut a plate having a U-shaped cross section with bifurcated legs and a space between the two legs. The gist is that the second member is provided with a protrusion for facing into the space and abutting the lower surface of the first member on which the holding nut is clamped, and a recess for accommodating the leg. do.

A preferred embodiment of the present invention is shown below in Figures 1 to 3.
This will be explained in detail based on the figures.

FIG. 1 is a perspective view of the floating nut of the present invention, FIG. 2 is an exploded perspective view showing the relationship between the two members to be joined and the floating nut, and FIG. 3 is a side view showing the floating nut in a clamped state.

The plate 3 fixed to the lower surface of the nut 2 by welding is formed into a wide W so as to sufficiently withstand the rotational torque generated when fastening the bolt, and is bent into a loop shape 4 at the middle part as shown in Fig. 1. It forms a U-shape, and its lower half forms left and right bifurcated legs 5 and 6 extending parallel to each other and spaced apart from each other to the left and right, and a space S ₁ of the same width is formed between the legs 5 and 6. A space _S2 of the same width is also formed between the left and right loop-shaped parts 4a and 4b forming the bases of the legs 5 and 6.

The nut fixing part 7 having the bolt insertion hole 8 in the upper half of the plate 3 and both leg parts 5 and 6 are formed in parallel, that is, there is a uniform clearance C between them.
is provided.

The first part that holds the floating nut 1
The member 11 is, for example, a flange of a fuel tank, and as shown in _FIG . A bolt insertion hole 13 is formed in the flange 11 portion at the rear of the protruding piece 12.

On the other hand, the second member 15 is, for example, a mounting part for a fuel pump cover, and a second member is provided on the upper surface of the mounting part 15.
As shown in the figure, a protruding part 16 is formed which engages and faces into the space _S1 between the leg parts 5 and 6, and
Recessed step portions 18 and 19 are formed on the left and right sides of the recessed portions 18 and 19 for accommodating the leg portions 5 and 6, respectively, and a bolt insertion hole 17 is formed through the protruding step portion 16.

Next, the installation procedure will be described.

First, the floating nut 1 is held between the portion of the flange 11 where the protrusion 12 is formed, and the nut 2 and the bolt insertion hole 13 of the flange 11 are aligned. At this time, since the clearance C between the nut fixing part 7 of the floating nut 1 and both leg parts 5 and 6 is uniform, there is no inclination of the nut 2 as shown in FIG. Furthermore, since the projecting piece 12 engages in the space _S2 between the left and right loop-shaped portions 4a and 4b, the floating nut 1 is positioned relative to the flange 11.

Then, the projecting part 16 of the mounting part 15 is brought into contact with the lower surface of the flange 11 with the projecting part 16 facing into the space _S1 between the left and right legs 5 and 6, and the bolt insertion hole 1 is brought into contact with the lower surface of the flange 11.
7 to match the nut 2 and the insertion hole 13.
At this time, concave step portions 18 and 19 are provided on the left and right sides of the protruding step portion 16.
, the leg portions 5 and 6 are accommodated in the recessed step portions 18 and 19, respectively, so that the nut 2 is not tilted and the floating nut 1 is not displaced. Furthermore, since the protruding portion 16 engages in the space _S1 between the legs 5 and 6, the mounting portion 15 is positioned relative to the floating nut 1.

Then insert a bolt (not shown) from below into the insertion hole 17,
It is screwed onto the nut 2 via 13 and 8 and fastened.
When tightening this bolt, both legs 5 and 6 are attached to the mounting part 1.
Since the nut 2 is housed in the recessed step portions 18 and 19 of the nut 2, the nut 2 does not tilt, and therefore the threads of the nut 2 do not become threaded, and the tightening torque can be stabilized. Furthermore, since each of the legs 5 and 6 engages with the side wall of the stepped portion 16, it is also possible to prevent the floating nut 1 from rotating together when the bolt is fastened.

Note that prevention of the floating nut 1 from rotating together is also achieved by a protrusion 12 provided on the flange 11. Also, such positioning and co-rotation prevention protrusions 12 are not necessarily necessary, and the point is that other members 15
It is sufficient to simply provide the protrusion 16 and the recesses 18 and 19.

As is clear from the above description, according to the present invention, the legs of the floating nut are formed into a bifurcated shape, and the first
Since the second member coupled to the member is provided with a protrusion and recesses on both sides of the protrusion, it is possible to prevent the nut from tilting and to prevent the screw thread from going up.
Nut displacement prevention and positioning can be achieved, furthermore, tightening torque can be stabilized, and nuts can be prevented from rotating together, among other advantages.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the floating nut of the present invention, FIG. 2 is an exploded perspective view showing an example of the mounting structure of the present invention, and FIG. 3 is a side view showing a clamped state.
Figure 4 is a perspective view of a conventional floating nut.
FIG. 5 is a side view showing the clamping state, and FIG. 6 is a side view showing the action. In the drawings, 1 is a floating nut, 2 is a nut, 3 is a plate, 5 and 6 are legs, 11 is a first member, 15 is a second member, 16 is a protrusion, and 18, 1
9 is a recess, _S1 is a space, and C is a clearance.

Claims (1)

[Scope of utility model registration request] A plate is formed into a U-shaped cross section, a nut is fixed to the upper half of the plate, a first member is sandwiched between the upper half and the lower half of the plate, and the nut and bolt are used to secure the first member. In the floating nut, the lower half of the plate is formed into a bifurcated shape to provide a space between both legs, and the floating nut is clamped to the second member. A mounting structure using a floating nut, characterized in that a protrusion facing into the space for abutting against the lower surface of the first member and a recess for accommodating the leg are provided.