JPS6151681B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for attaching a screw hole piece to an extruded material made of aluminum or the like.

Since an extruded material has the same cross-sectional shape over its entire length during manufacture, even in an extruded material with screw holes, the screw holes are formed over the entire length in the longitudinal direction. Fig. 1a shows an arc-shaped fin piece 2 formed on an extruded material 1, and Fig. 1b shows an arc-shaped fin piece 2 formed at the tip of a protrusion 3 to form a screw hole 4.
These fin pieces 2 and protrusions 3 are formed continuously along the entire length in the longitudinal direction. However, for the purpose of screw connection, it is only necessary to form screw holes at the longitudinal ends of the extruded material, corresponding to the length of the screws to be used, and the other parts are useless (although they do have a reinforcing effect). . The cross-sectional area of this screw hole portion is several percent of the cross-sectional area of the entire mold material, and that much material is wasted. In order to solve this problem, a method has been proposed in which a separate screw hole piece is made and this is screwed to the end of the mold material, but such a method requires drilling holes in the mold material. Not only is processing and installation troublesome, but
If the screw holes were completely eliminated, the strength of the entire mold material would be reduced, and therefore the thickness of the entire mold material would have to be increased, and in the end, the effect of material savings could not be obtained much.

The present invention is an extruded mold material that allows screw hole pieces to be easily and securely attached to the longitudinal ends of the mold material without any processing on the mold material itself, and which enables a significant saving in materials without sacrificing the strength of the mold material body. The purpose of the present invention is to provide a mounting structure for screw hole pieces in the present invention.

Embodiments of the present invention will be described below with reference to the drawings. Ribs 6 are formed on the extruded material 5 over the entire length in the longitudinal direction. The rib 6 has a generally T-shaped cross section, and includes a leg portion 6a and a flange portion 6b formed at the tip of the leg portion 6a. and,
A screw hole piece 7, which is separately formed by extrusion molding or the like, is attached to the longitudinal end of the rib 6. The screw hole piece 7 has a length corresponding to the length of a screw (not shown) to be used, and is relatively short. The screw hole piece 7 in the embodiment shown in FIGS. 2 to 4 has a screw hole 8 at its tip.
A fitting groove 9 and protrusions 10 having a triangular cross section along both edges of the fitting groove 9 are formed at the base end. This screw hole piece 7
After sliding the fitting groove 9 into the rib 6 and fitting it, as shown in FIG. 3, a pair of caulking tools 11,
At step 12, the extruded mold material 5 and the screw hole piece 7 are pressed in the direction of the arrow. As a result, the protrusion 10 of the screw hole piece 7 bites into the flat plate part 5' of the extrusion molded material 5, and the flange part 6b is pressed and deformed on the bottom surface of the fitting groove 9, resulting in the state shown in FIG. 4, and the screw hole piece 7 is securely fixed.

In the embodiment shown in FIGS. 5 and 6, a screw hole piece 7 has a groove 13 formed at its base end, and protrusions 1 having a triangular cross section facing each other on both sides of the groove 13.
4 and 14, and has a cylindrical shape with a circular arc portion 15 at the tip. This screw hole piece 7 is assembled by sliding the groove 13 into engagement with the rib 6 as shown in FIG. is bitten into the leg portion 6b of the rib 6 and fixed. If relief grooves 17 are formed inside the side walls 16, 16 as necessary, the side walls 16, 16 can be easily deformed during caulking. In this embodiment, a screw hole is formed by the inner wall of the circular arc portion 15 of the screw hole piece 7 and the surface of the flange portion 6b of the rib 6.

As described above, according to the present invention, a rib extending over the entire length in the longitudinal direction is formed on an extruded material, and a screw hole piece having a length corresponding to the length of the screw is fixed to the longitudinal end of the rib by caulking. As a result, the amount of material used can be significantly reduced compared to the conventional method in which screw holes are formed over the entire length of the extruded material, and there is no need to perform any processing on the extruded material. It is easy to operate and provides high mounting strength, and since the ribs also contribute to reinforcing the extruded material itself, there is an effect that the strength does not decrease even though the screw holes are not formed over the entire length.

[Brief explanation of the drawing]

Figures 1a and b are perspective views showing two examples of conventional extruded molded materials with screw holes, Figures 2 to 4 are the first embodiment of the present invention, Figure 2 is an exploded perspective view, and Figure 3 is an exploded perspective view. Figure 4 is a cross-sectional view showing the screw hole before caulking, Figure 5 is a perspective view showing the screw hole piece of another embodiment, and Figure 6 is a cross-sectional view showing the same state after caulking. be. 5: Extruded mold material, 6: Rib, 7: Screw hole piece.

Claims (1)

[Claims] 1 A rib is formed over the entire length of the extruded material 5 in the longitudinal direction, and a screw hole piece 7 having a length corresponding to the length of the screw is provided at the longitudinal end of the rib 6.
A mounting structure for a screw hole piece in an extruded material, characterized by caulking and fixing.