JPS5928767B2 - Concrete wall fitting bolt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concrete wall fitting bolt used for fixing objects to a concrete wall in a concrete building, and its purpose is to prevent misuse. Another object of the present invention is to provide a bolt that can be fitted into a concrete wall, in which the bolt can be smoothly screwed into a nut without allowing concrete dust to enter into the screw hole 6 of the nut.

The concrete wall fitting bolt according to the present invention will be explained below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of a concrete wall fitting bolt 1 according to the present invention, in which a conical nut 4 is screwed onto a bolt 3 inserted into an outer cylinder 2, and the nut 4 is expanded. A bottom plate 5 which can be easily broken open is formed at the bottom, and a screw hole 6 is sealed at the bottom of the nut 4.

The bottom plate 5 is formed by attaching a thin plastic plate to the bottom of the nut 4 using a resin adhesive.

The state of use when fixing the plate 7 to the concrete wall surface 8 will be explained with reference to FIGS. 2 and 3.

A fitting hole 9 of approximately the same size as the outer cylinder 2 is bored in the concrete wall surface 8,
The entire length of the outer cylinder 2 is fitted into this.

At this time, the upper end of the nut 4 is fitted into the skirt portion 10 formed at the rear of the outer cylinder 2.

The outer tube 2 is inserted so that the skirt portion 10 is positioned at the bottom of the fitting hole 9.

At this time, since the bottom of the nut 4 is sealed by the bottom plate 5, dust in the fitting hole 9 does not enter into the screwing hole 6 of the nut 4.

Next, when the bolt 3 is inserted from the upper surface of the outer cylinder 2 and screwed onto the nut 4, the protrusion 11 on the circumferential surface of the nut 4 is locked to the inner surface of the outer cylinder 2, so that the nut 4 can be inserted into the bolt 3 without idling. The skirt part 1 is gradually pulled up and enlarged as the
At 0, the lower end of the outer cylinder 2 expands as shown in FIG. 3 and comes into pressure contact with the inner surface of the fitting hole 9.

12 is Natsu. The bolt 3 is screwed into the nut 4 smoothly.

The bottom of the nut 4 is sealed with a bottom plate and dust is removed from the screw hole 6.
Because it does not go inside.

When the tip of the bolt 3 hits the bottom plate 5, the attached bottom plate 5 is peeled off, as shown in FIG.

In this manner, the bottom plate 5 is easily broken open, so that it does not interfere with the screwing of the bolts 3.

Since the thrust of the bolts 3 due to the screw engagement is strong, the bottom plate 5 will not peel off when attached with a general adhesive.

It is obvious that if the bolts 3 are short and do not hit the bottom plate 5, there is no need for the bottom plate 5 to burst.

Because of the slanted configuration, it is possible to prevent the concrete wall fitting bolt 1 from being used incorrectly.

That is, although in order to insert the outer cylinder 2 into the fitting hole 9, the outer cylinder 2 must be inserted into the fitting hole 9 from the side of the skirt portion 10 into which the nut 4 is fitted, conventionally the nut 4 is accidentally inserted. There is a case where the outer cylinder 2 is inserted into the fitting hole 9 from the end opposite to the skirt part 10 (that is, when the nut 4 is located closer to the opening of the fitting hole 9 than the outer cylinder 2). Even when the bolt 3 is screwed into the nut 4, the skirt portion 10 is not expanded by the nut 4, and the outer cylinder 2 is not fixed in the fitting hole 9. As a result, the outer cylinder 2 is not fixed to the concrete wall surface 8. However, according to the present invention, the bottom plate 5 is formed at the bottom of the nut 4 that fits into the skirt portion 10 of the outer cylinder 2, so that the nut 4 is inserted into the skirt portion 10. When the outer cylinder 2 is inserted into the fitting hole 9 from the opposite end, the bottom plate 5 at the bottom of the nut 4 will be located closer to the opening of the fitting hole 9 than the screwing hole 6. This is because the screwing operation for screwing the bolt 3 into the screwing hole 6 cannot be performed due to the presence of the bolt, and the user may notice a mistake in use.

Note that even if the bottom plate 5 is not of the type that peels off from the nut 4 to open the bottom of the nut 4, it is made of paper, thin metal, cloth, etc., and can be broken by the threading thrust of the bolt 3 as shown in FIG. Of course, it is also possible to open the bottom part by doing so, and the same effect as the above example can be achieved.

As described above, the concrete wall fitting bolt according to the present invention has a conical nut screwed onto a bolt inserted into an outer cylinder, and a bottom plate that can be easily ruptured is formed at the enlarged bottom of the nut. Even if the outer cylinder is accidentally inserted into the hole in the concrete wall from the end opposite to the skirt portion into which the nut is inserted, the bottom plate will prevent the nut from being inserted. If you are unable to screw the bolt into the screw hole and immediately realize that you are using it incorrectly, or if you insert the outer cylinder into the hole through the skirt part where the nut has been fitted (
When inserted in the correct direction), the bottom of the nut is sealed by the bottom plate, preventing concrete dust from entering the screw hole, allowing the bolt to screw into the nut smoothly.

[Brief explanation of drawings]

1 to 3 are views showing one embodiment of the concrete wall fitting bolt according to the present invention, in which FIG. 1 is an exploded perspective view, FIGS. 2 and 3 are sectional views, and FIG. 4 is a concrete wall fitting bolt according to the present invention. FIG. 4 is a cross-sectional view showing a different embodiment. 1...Concrete wall fitting bolt, 2...
... Outer cylinder, 3 ... Bolt, 4 ... Nut, 5 ... Bottom plate.

Claims (1)

[Claims] 1. A concrete wall fitting bolt formed by screwing a conical nut onto a bolt inserted into an outer cylinder, characterized in that a bottom plate that can be easily ruptured is formed at the expanding bottom of the nut. .