JP2000161323A - Anchor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit strong mounting by making at least an opening end inside surface of a hole part to be inserted with a screwing tool for mounting plastic forming a tapered part of an outward expanding diameter shape on the opening end inside surface and making screwing tools of different kinds of outside diameters correspond to the tapered part. SOLUTION: This anchor is made of hard plastic as a whole and is provided with an anchor main body part 4 having a shaft part 2 having a punch hole blade 1 formed at a tip and a spiral male screw projecting line 3 which is projectingly provided on the outer periphery 2a and a flange head part 5 at the base end. The anchor has a hole part 6 into which a screwing tool for mounting 24 is inserted at an axial center and a slit part 7 is formed from a depth part of the hole part 6 up to the vicinity of the tip. A tip of the slit part 7 is connected with two leg pieces 9, 9 by a temporary connecting part 8. Because the two leg pieces 9, 9 are weak in strength in their separate states when screwing onto a plaster board 10 is performed, the two leg pieces 9, 9 are reinforced each other. This temporary connecting part 8 is cut in a final mounting state, and the two leg pieces 9, 9 are expanded and are strongly fixed to the plaster board 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building anchor.

[0002]

2. Description of the Related Art Conventionally, as an anchor used for a gypsum board or the like, an entirely made of metal and a male screw ridge is projected from an outer periphery of a shaft portion and screwed onto the gypsum board while self-tapping. Then, a screwing device for mounting an object to be mounted is screwed into the hole of the anchor. In this conventional anchor, a plus screwdriver is used for the self-tapping. For this reason, the hole into which the screw fastener is inserted has a cross shape, and has the same cross-sectional shape up to the opening end.

[0003]

By the way, when attaching various kinds of articles such as toilet paper holders and shelves to a gypsum board or the like at a building site or at each household, the following conventional anchors are used. Such a problem had occurred.

That is, for example, 3
Since different kinds of screws (screws) of mm to 6 mm are used (in various ways), if a cross-shaped hole of an anchor is made for a screw of 4 mm (for example), a screw of 4.5 mm will be used. It is difficult to proceed. Conversely, if a 3 mm screw is used, it cannot be firmly fixed and may be pulled out.

As described above, a predetermined screw (screw attachment) is required for a plug of a predetermined size.
If the diameter of the screw attached to the toilet paper in advance is too large or too small, the mounting work cannot be reliably performed, and the operator is often troubled.

[0006]

In the anchor according to the present invention, at least the inner surface of the open end of the hole into which the mounting screw is inserted is made of plastic, and the inner surface of the open end of the plastic is provided with an outwardly enlarged shape. The tapered portion is formed so that the screw fasteners having different outer diameters can be used.

A cross-shaped groove is formed in the inner surface of the plastic opening end so that the tip of a bit of a Phillips screwdriver can be inserted thereinto.
In addition, the base end of the plus tooth at the tip end of the bit is recessed by 2.0 mm or more from the base end surface of the anchor so that the bit can be inserted into the hole, forming a hole engagement portion.

Then, the sinking dimension is set to 2.0 mm to 5.0 mm.
Set to. Further, the inclination angle of the tapered portion was set to 5 ° to 30 °. Further, the tapered portion was constituted by a plurality of tapered portions having an outwardly enlarged diameter. In addition, a piercing blade is formed at the tip and a helical male screw ridge is formed on the outer periphery of the shaft portion, and a slit portion is formed so that the shaft portion is opened with the screwing of the mounting screw. .

[0009]

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

In FIG. 1 to FIG. 6, this anchor is mainly used for gypsum board, the whole is made of hard plastic, and a shaft portion 2 having a perforation blade 1 formed at the tip and an outer periphery 2 thereof.
a, a main body 4 having a helical male screw ridge 3 protruding from the main body 4 and a flange head 5 at a base end thereof.

As shown in a mounting state of FIG. 8 described later, the shaft 6 has a hole 6 into which a screw fitting 24 such as a screw or a bolt is inserted. Up close
A slit portion 7 is formed. The shaft 2 is bifurcated from the slit 7 as the screwing tool 24 advances (see FIG. 8).

In the example shown in FIG.
The two leg pieces 9, 9 are connected to the tip of the slit portion 7 at the temporary connecting portion 8 at the time of screwing into a gypsum board or the like. , 9 reinforce each other that they are weak in strength. As shown in FIG. 8, the temporary connecting portion 8 is cut in the final mounting state, and the two leg pieces 9, 9 are enlarged and firmly fixed to the gypsum board 10.

As shown in FIG. 8, at least the inner surface of the open end of the hole 6 into which the mounting screw 24 is inserted is made of plastic. 1 and 8 show a case where the whole anchor is made of hard plastic.

On the inner surface of the opening end of the hole 6, (-in FIG. 4)
As is apparent from FIG. 5, a taper portion having an outwardly enlarged diameter is formed, and thread diameters are different as shown by phantom lines in FIG. 5 (different outer diameters d ₁ and d ₂ ). ) The screw fitting 24 is configured to be compatible {screw advanceable}. In particular, since a plastic, it is different outside diameter of the screwing tool 24 and d ₁ to d _2, while self-tapping, is relatively smooth to allow screwed.

As shown in FIG. 4 and FIG. 6 (showing a cross section thereof), the cross groove portion 12 is recessed in the inner surface of the above-mentioned open end having an outwardly enlarged shape, and the bit of the Phillips screwdriver 13 is formed. The tip 13a is insertable (engageable).
Moreover, the base end P of the plus tooth of the bit tip 13a is larger than the base end surface 14 of the anchor {the upper surface of the flange head 5}.
The cross groove portion 12 is deeply formed (formed) deeply into (inside) the hole portion 6 so as to be inserted while being lowered by 2.0 mm or more. As described above, the anchor of the present invention has the hole inner meshing portion 15.

In FIG. 6, what is indicated by a broken line C is the position of the tapered portion 11 in FIG. This broken line C (shown by a solid line)
The step with the cross groove portion 12 (the portion which is formed so as to protrude in a triangular mountain shape at a 90 ° pitch in FIG. 4) is the hole inner portion engaging portion 15.

In spite of the disadvantage that the plastic is liable to crack when a large rotational torque is applied, in the present invention, the meshing portion 15 is disposed at the inner position of the hole 6.
The crack can be effectively prevented, and a large torque can be applied.

The sinking dimension T is set to 2.0 mm to 5.0 mm.
It is preferable to set When T is less than 2.0 mm, the above-described crack prevention effect is small. Conversely, when T exceeds 5.0 mm, a relatively large cross-sectional portion of the hole is formed unnecessarily deep. This is because the thickness of the peripheral wall of the anchor becomes thin, which is disadvantageous in strength. FIG.
As is clear from FIGS. 2 and 3, the reason why the outwardly enlarged tapered portion 16 is formed at the base end of the shaft portion 2 is to reinforce the thickness of the peripheral wall described above. This is desirable from the viewpoint of the fixing strength when screwed to the gypsum board 10 as shown in FIG.

Next, the inclination angle θ of the above-mentioned tapered portion 11 which can be applied to the screw fasteners 24 of different diameters, ie, the angle on one side with respect to the axis, is 5 ° to 30 °. preferable. If the inclination angle θ is less than 5 °, the hole 6 becomes too long, and if it exceeds 30 °, the self-tapping of the screw fastener 24 becomes difficult to be performed smoothly.

Further, At a 5, a ratio of an open end diameter D ₂ and the rear portion minimum diameter D ₁ of the tapered portion 11 is preferably set to (1.2 to 3.5). In particular, (1.5 to 3.2) is desirable. The reason is that if it is smaller than the lower limit, the application range of the screw fasteners 24 of different diameters is not practically preferable, and conversely, if it exceeds the upper limit, it can be applied to the screw tools 24 of various diameters. Although conceivable (at first glance), the dimensions and strength of the other parts of the anchor become unbalanced (relative to the applied screw diameter of the screw fastener).

Accordingly, the ratio of the maximum screw diameter to the minimum screw diameter that can be used as the screw fastener 24 is (1.3 to 3.3), and particularly preferably (1.4 to 3.0).

FIG. 7 shows another embodiment, in which a plurality of tapered portions 11a, 11b, 11c,... Having an outwardly enlarged diameter are provided, and a straight portion is interposed therebetween. I have. At this time, the inclination angle θ, D ₂ / D _{1 and the} like are the same as those in the embodiment of FIG.

The method of using the thus constructed anchor according to the present invention will be described. First, the bit tip 13a of the cross (plus) driver 13 is inserted (as shown in FIG. 6), and the hole inner portion is engaged. Engage at 15, apply rotation, and screw into gypsum board 10. Even though it is a plastic anchor, the inner part of the hole that receives its rotational torque inside
Because of having 15, the male screw ridge 3 advances while self-tapping to the gypsum board without generating cracks or the like.
Since the drilling blade 1 at the tip advances ahead after drilling the prepared hole, self tapping can be performed smoothly. In addition, this piercing blade 1
Can be freely deformed.

Further, since the two leg pieces 9, 9 are connected by the temporary connecting portion 8, the two leg pieces 9, 9 are prevented from being bent or broken. Finally, since the tapered portion 16 is pressed into the board 10, the anchor is fixed without rattling.

Next, the object 17 (toilet paper holder, shelf, shelf mounting bracket, hanging bracket, etc.) is screwed into
The temporary connecting portion 8 is cut off and the two leg pieces 9 and 9 are enlarged (spread) as the screw attachment 24 advances. Even if the outer diameter of the screwing device 24 ───screw diameter─── is different in size, the present anchor has the tapered portion 11,
Can be screwed smoothly (applicable).

Although not shown, a plastic short cylinder is integrated into the hole of the metal shaft 2 and the male screw ridge 3 by press-fitting, bonding, fusion or the like, and the inner surface of the opening end is formed. The plastic may be formed in the shape and dimensions as described above, but it is free.

[0027]

According to the present invention, the following significant effects can be obtained by the above configuration.

(According to the first aspect) With one type of anchor, the screw fastener 24 of unknown dimensions can be used at each home / site.
Alternatively, the screw fasteners 24 of various sizes can be easily used as they are, and the work can be performed quickly and easily. Further, the screwing device can be screwed straight without tilting, and can be firmly attached.

According to the second aspect, a strong rotational torque can be applied by the plus driver 13. That is, no crack is generated from the open end of the hole 6 of the anchor.

According to the third aspect of the present invention, it is possible to receive a strong rotation torque generated by the plus screwdriver 13 and not to unnecessarily lengthen the hole.

[0031] According to claim 4 or 5, screw fasteners 24 of different sizes are easy to apply, and are guided into the hole 6 with smooth self-tapping.

(According to claim 6), quick, reliable, and firm mounting can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional front view of an embodiment of the present invention.

FIG. 2 is a front view.

FIG. 3 is a side view.

FIG. 4 is an enlarged plan view.

FIG. 5 is an enlarged sectional explanatory view of FIG. 4;

FIG. 6 is an explanatory enlarged sectional view of FIG. 4;

FIG. 7 is an enlarged cross-sectional explanatory view showing another embodiment of the present invention.

FIG. 8 is a sectional view illustrating a method of use.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling blade 2 Shaft 2a Shaft outer periphery 3 Male screw ridge 6 Hole 7 Slit 11 Taper 12 Cross-shaped groove 13 Phillips screwdriver 13a Bit tip 14 Anchor base end face 15 Hole inner meshing part 24 Mounting screw P base Edge T Subduction dimension θ Tilt angle

Claims (6)

[Claims] 1. At least the inner surface of the opening end of the hole 6 into which the attachment screw 24 is inserted is made of plastic, and a tapered portion 11 having an outwardly enlarged diameter is formed on the inner surface of this plastic opening end. An anchor characterized in that the screw fitting 24 having an outer diameter of is adapted to be compatible. 2. A cross groove 12 is recessed in the inner surface of the open end of the plastic so that the bit tip 13a of the Phillips screwdriver 13 can be inserted. 2. The anchor according to claim 1, wherein the hole engagement portion 15 is formed so as to be able to be inserted by being sunk more than mm. 3. The anchor according to claim 2, wherein the sinking dimension T is set to 2.0 mm to 5.0 mm. 4. The anchor according to claim 1, wherein the inclination angle θ of the tapered portion is set to 5 ° to 30 °. 5. An anchor according to claim 1, wherein the tapered portion comprises a plurality of tapered portions having an outwardly enlarged diameter. 6. A piercing blade 1 is formed at the tip, a helical male screw ridge 3 is formed on the outer periphery 2a of the shaft portion, and the shaft portion 2 is opened as the mounting screw 24 advances. The anchor according to claim 1, 2 or 3, wherein the slit portion 7 is formed so as to perform.