JPS6324250Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to nuts, and in particular to nuts, which are used to secure threaded studs to a member such as a vehicle body through which other members are fixed, such as protection plates for fuel pipes of automobiles. This relates to a nut used to fix the vehicle to the vehicle body.

Conventional technology Protective plates for protecting automobile fuel pipes are
It was fixed by attaching a screw to a nut welded to the car body. However, this mounting method requires the rotation of screws, resulting in poor workability, and has the disadvantage that the nuts and screws increase weight. Furthermore, although this is not noticeable when the protective plate is made of metal, when the protective plate is made of synthetic resin, there is also the disadvantage that even if the protective plate expands due to heat, there is no escape due to the strong tightening force of the screws, causing the plate to become wavy and deformed. .

Problems to be Solved by the Invention Accordingly, the object of the present invention is to provide a nut which is easy to install and which does not cause waving deformation due to thermal expansion.

Means and Effects for Solving the Problems According to the present invention, a cylindrical body is formed inside the through hole inserted into the threaded stud from one end of the nut toward the other end, and this cylindrical body is The tip of the cylindrical body is tapered so that its inner diameter is approximately equal to the root diameter of the thread of the stud, and the cylindrical body is partially thinned in the axial direction from the tip to the root. Provided is a nut characterized in that the strength of the nut is selected to such an extent that the cylindrical body is torn when inserted into a stud.

Due to this feature, when the nut is pushed into the threaded stud, the cylindrical body engages with the screw and the nut is connected to the stud, and the nut can be easily removed by rotating the nut. In addition, since the thin part breaks when the cylindrical body is inserted into the stud, not only does the cylindrical body act as a resilient locking pawl, but its engagement area is large and the holding strength is maintained high.

Example 1 In Fig. 1, a threaded stud 2 is attached to a vehicle body 1.
The protective plate 3 is shown attached to the vehicle body 1 via the nut 4 according to the present invention.

The nut 4 is integrally molded entirely from synthetic resin, and its details are shown in FIGS. 2a to 2f. In FIGS. 2a to 2f, the nut is shaped as a hexagonal nut, one end of which is provided with a flange 5 as a seat. A stud through hole 7 is formed inside the nut body 6, and the diameter of this through hole 7 is larger than the stud outer diameter. The nut 4 is integrally formed with a cylindrical body 9 extending from the end where the flange 5 is formed toward the other end (upper end) with an annular gap 8 inside the through hole 7. .

The inner diameter of the cylindrical body 9 is preferably slightly larger than the outer diameter of the threaded stud 2, so that the cylindrical body 9 engages the stud in an axially aligned manner when inserted through the stud. The upwardly extending tip 10 of the cylindrical body 9 is reduced in diameter to such an extent that its inner diameter is approximately equal to the root diameter of the thread of the stud.
Further, a thin linear portion 11 is formed in the axial direction from the tip 10 of the cylindrical body 9 toward the root. A plurality of thin-walled portions 11 (three in the illustrated example) are provided at intervals on the outer peripheral surface of the cylindrical body 9, and the thickness is such that the thin-walled portions 11 are torn when the cylindrical body 9 is inserted into the stud 2. has been selected.

In order to facilitate insertion into the stud 2, the opening at the base of the cylindrical body 9 is preferably tapered outward. Further, the width of the annular gap 8 can be determined appropriately, and the gap 8 is narrowed so as to support when the cylindrical body 9 is inserted into the stud 2 and the tip 10 expands outward. Strength can be increased.

The protective plate 3 is installed using the nut 4 having such a structure.
(FIG. 1) is attached to the vehicle body 1, the mounting hole 12 of the protection plate 3 is placed through the stud 2, and the nut 4 is pushed into the stud 2 from the flange 5 side.
As a result, the tip 10 passes through the hole in the cylindrical body 9 and expands outward by the screw thread of the stud 2, but at this time, a breaking force is applied to the thin walled portion 11, and the tip 10 is expanded outwardly by the thread of the stud 2. Number (3 in the example shown)
divided into. Note that this breakage does not have to extend to the root portion of the cylindrical body 9, but at least the tip 1.
Only 0 needs to be divided. At the end of the insertion, the segmented tips 10 fall inwards again, so that they are formed as resilient pawls which dig into the valleys of the studs 2. Therefore Natsuto 4
is engaged with the stud 2 as a whole, and the protective plate 3 is attached to the vehicle body 1 by the flange 5. As mentioned above, a locking pawl is formed that is divided into only the necessary minimum amount, and the rest remains in its shape as a cylindrical body, so compared to a locking pawl that is divided in advance,
The locking area for the stud is large and the engagement force is high. Further, as described above, by reducing the width of the annular gap 8, the expansion and expansion of the distal end 10 of the cylindrical body 9 toward the outside in the radial direction is reduced, and the fixing strength can be increased. In order to remove the nut 4, it is sufficient to turn it by hand, or if the space is narrow as shown in FIG. 1, the nut body 6 may be rotated using a tool such as an impact wrench or a nut driver.

Effects of the Invention According to the present invention, the installation work can be performed by simply pushing in the nut, which eliminates the need to rotate the nut and improves work efficiency. In addition, since the installation work is done by pushing, there is no need to over-tighten the parts to be installed, and even if the parts expand thermally, they will slide on the contact surface between each part and the flange, preventing it from escaping. There is no rippling or deformation. Further, since the cylindrical body is expanded and divided when its tip hits the thread of the stud, a resilient locking pawl is formed, and this locking pawl allows for easy insertion without requiring a weak pushing force. Moreover, this locking pawl has a larger engagement area than one in which divided locking pawls are provided in advance, and can maintain its holding strength at a high level. In addition, since the nut can be integrally molded from synthetic resin, the product cost can be lowered, and it also has a rust-preventing effect, making it possible to keep the weight low.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing how the protective plate is attached to the vehicle body using the nut according to the present invention, Figures 2 a to f
shows the details of the nut, and a is the plan view.
Figure b is a front view, Figure c is a bottom view, Figure d is a right side view, Figure e is a sectional view taken along the line ee-e of Figure a, Figure f
is a cross-sectional view taken along line ff in FIG. 1...Vehicle body, 2...Studs, 3...Protection plate,
4... Nut, 5... Flange, 6... Nut body, 7... Stud insertion hole, 8... Annular gap, 9
... Cylindrical body, 10 ... Tip, 11 ... Thin wall part.

Claims (1)

[Claims for Utility Model Registration] (1) In a nut used for fixing another member to a member to which a threaded stud is fixed via the stud, the inside of the through-hole inserted into the stud, A cylindrical body is formed from one end of the nut to the other end, and the diameter of the tip of this cylindrical body is reduced so that the inner diameter is approximately equal to the root diameter of the thread of the stud. A nut characterized by being partially thin in the axial direction from the tip of the body toward the base, and the thickness of this thin part being selected to be such that it will break when the cylindrical body is inserted into a stud. (2) The nut according to claim 1, wherein the thin wall portion is formed at at least two locations spaced apart from each other on the outer peripheral surface of the cylindrical body. (3) The thin wall portion is spaced 3 times apart on the outer surface of the cylindrical body.
Scope of Claims for Utility Model Registration
Nuts described in (1). (4) The nut according to claim (1) of the utility model registration, characterized in that a flange serving as a seat for the nut is formed at the end where the cylindrical body is formed. (5) The nut according to claim (1) of the utility model registration claim, characterized in that the nut is integrally molded from synthetic resin.