JP2003013920A - Anchor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor favorable in workability, capable of simply using screwing implements having various dimensions as they are in respective houses and construction sites. SOLUTION: At least an opened end inside face of a hole 6 in which a fitting screw instrument is inserted is made of plastic and an outwardly widened tapered section 11 is formed at the plastic opening end inside face. The anchor is constituted so that the screw instrument having a different outside diameter can cope with problems.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an anchor for construction.

[0002]

2. Description of the Related Art Conventionally, as an anchor used for a gypsum board, etc., it is conventionally entirely made of metal, and a male screw ridge is projected on the outer periphery of a shaft portion and self-tapping and screwed to the gypsum board etc. Then, after that, it is known that a screw attachment tool for attaching an attachment is screwed into the hole of the anchor. In this conventional anchor, a Phillips screwdriver is used for the self-tapping. Therefore, the hole into which the screwing tool is inserted has a cross shape, and has the same cross-sectional shape up to the opening end.

[0003]

By the way, at the construction site or in each household, when various kinds of toilet paper holders, shelves, etc. are attached to the gypsum board etc., the following anchors are used. There was such a problem.

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

As described above, a plug having a predetermined size requires a predetermined screw (screw fastener), and at a work site, for example,
If the diameter of the screw attached to the toilet paper in advance is too large or too small, it is not possible to carry out a reliable mounting work, and the operator is often in trouble.

[0006]

In the anchor according to the present invention, at least the inner surface of the opening end of the hole into which the mounting screw fastener is inserted is made of plastic, and the inner surface of the plastic opening end is expanded outwardly. A tapered portion is formed, and the ratio of the opening end diameter of the tapered portion and the minimum inner diameter is set to 1.2 to 3.5,
The screw fasteners having different outer diameters are configured to be compatible.

Further, a cross groove portion is provided on the inner surface of the plastic opening end so that the tip of a Phillips screwdriver bit can be inserted.
In addition, the base end of the positive tooth at the tip of the bit can be inserted by being recessed by 2.0 mm to 5.0 mm from the anchor base end surface to form a deep hole meshing portion.

Further, the inclination angle of the taper portion is set to 5 ° to 30 °. Further, the taper portion is composed of a plurality of taper portions having an outwardly enlarged diameter and a straight portion interposed between the plurality of taper portions. In addition, a piercing blade is formed at the tip, a spiral male screw ridge is provided on the outer periphery of the shaft portion, and a slit portion is formed so that the shaft portion opens as the screwing tool for attachment is advanced. .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

1 to 6, this anchor is mainly used for gypsum board, and is made entirely of hard plastic, and has a shaft portion 2 having a piercing blade 1 formed at its tip and its outer periphery 2
An anchor main body 4 having a spiral male screw protrusion 3 protruding from a and a flange head 5 at the base end thereof are provided.

Then, as shown in a mounting state of FIG. 8 which will be described later, a hole portion 6 into which a mounting screw fitting 24 such as a screw or a bolt is inserted is provided at the center of the shaft, and the hole portion 6 extends from the inner portion to the tip. Up close
The slit portion 7 is formed. As the screw fastener 24 is advanced, the shaft portion 2 opens from the slit portion 7 in a bifurcated manner (see FIG. 8).

In the example shown in the figure, a "ku" is formed near the root of the punching blade 1.
The two leg pieces 9, 9 are connected to each other at a temporary connecting portion 8 at the tip of the slit portion 7 so that the two leg pieces 9 are screwed into a gypsum board or the like. , 9 are loose in strength, but they are reinforced each other. As shown in FIG. 8, the temporary connecting portion 8 is cut in the final mounting state, the two leg pieces 9 and 9 are enlarged, and firmly fixed to the gypsum board 10.

Then, as shown in FIG. 8, at least the inner surface of the opening end of the hole 6 into which the mounting screw fitting 24 is inserted is made of plastic. 1 and 8 show the case where the entire anchor is made of hard plastic.

On the inner surface of the open end of the hole portion 6, (-
As shown in FIG. 5, a taper portion having an outwardly expanded diameter is formed, and the screw diameters are different as shown by phantom lines in FIG. 5 (for different outer diameters d ₁ and d ₂ ). ) The screw fitting 24 is adapted to be capable of being screwed. In particular, since it is made of plastic, even if the outer diameter of the screw fitting 24 is different from d _{1 to} d ₂ , it is possible to relatively smoothly screw while self-tapping.

By the way, as shown in FIG. 4 and FIG. 6 (the cross section thereof is shown), the cross groove portion 12 is recessed on the inner surface of the above-mentioned opening end of the outer diameter expansion shape, and the bit of the plus driver 13 is formed. The tip 13a can be inserted--and can be meshed--.
Moreover, the base end P of the plus tooth of the bit tip 13a is more than the anchor base end face 14--the upper face of the flange head 5--.
The cross groove portion 12 is deeply cut (formed) to the inner portion (inside) of the hole portion 6 so as to be inserted by sinking 2.0 mm or more. As described above, the anchor of the present invention has the hole inner portion meshing portion 15.

In FIG. 6, the broken line C indicates the position of the taper portion 11 in FIG. This broken line C and (shown by the solid line)
The step with the cross groove portion 12--where the protrusions are formed in a triangular chevron shape at a 90 ° pitch in FIG.

Although the plastic has a defect that cracks easily occur when a large rotational torque is applied, in the present invention, since the meshing portion 15 is arranged inside the hole portion 6,
The crack can be effectively prevented and a large torque can be applied.

The sinking dimension T is 2.0 mm to 5.0 mm.
It is preferable to set to. If T is less than 2.0 mm, the above-mentioned crack prevention effect is small, and conversely, if T is more than 5.0 mm, a relatively large cross section of the hole is unnecessarily formed deep. This is because the wall thickness of the surrounding wall of the anchor becomes thin, which is disadvantageous in terms of strength. Note that FIG.
As is clear from FIG. 2 and FIG. 3, the outer diameter expanding taper portion 16 is formed at the base end of the shaft portion 2 for the purpose of reinforcing the wall thickness of the surrounding wall. It is desirable to do so from the standpoint of fixing strength when screwed onto the gypsum board 10 as shown in FIG.

Next, the inclination angle θ of the above-mentioned taper portion 11 applicable to the screw fasteners 24 having different diameters, which means 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 °, it becomes difficult to smoothly perform self-tapping of the screw fitting 24.

Further, in FIG. 5, the ratio of the opening end diameter D ₂ of the taper portion 11 to the innermost minimum diameter D ₁ is preferably (1.2 to 3.5). Especially, (1.5 to 3.2) is preferable. The reason is that if it is smaller than the lower limit, the application range of the screw fasteners 24 of different diameters is narrow and not practically preferable, and conversely, if the upper limit is exceeded, it can be applied to screw fasteners 24 of various diameters. It is conceivable (at first glance), but the dimensions and strengths of the other parts of the anchor are unbalanced (relative to the applied screw diameter of the screw fastener).

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

FIG. 7 shows another embodiment in which a plurality of outwardly expanded taper portions 11a, 11b, 11c ... Are arranged, and a straight portion is interposed therebetween. There is. The inclination angle θ, D ₂ / D _{1 and the} like at this time are also the same as those in the above-described 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) to engage the inner part of the hole. Engage at 15, give rotation, and screw into gypsum board 10. Even though it is a plastic anchor, the inner part of the hole that receives the rotation torque inside
Since it has 15, the male screw ridge 3 advances while self-tapping on the gypsum board without causing cracks or the like.
Since the piercing blade 1 at the tip goes through the prepared hole and moves forward, smooth self-tapping is possible. In addition, this punching blade 1
The shape of can be freely modified in various ways.

Further, since the leg pieces 9, 9 are connected by the temporary connecting portion 8, the leg pieces 9, 9 are prevented from being bent or broken, respectively. Finally, since the taper portion 16 is press-fitted into the board 10, the anchor is fixed without rattling.

Next, the attached objects 17--toilet paper holders, shelves, shelf fittings, hanging fittings, etc .-- are screwed onto
Although it is attached at 24, as the screw fitting 24 is screwed forward, the temporary connecting portion 8 is cut and both leg pieces 9 and 9 are enlarged (open legs). Even if the outer diameter of the screw fastener 24 is different in size, the anchor has the tapered portion 11,
Can be smoothly screwed (applicable).

Although not shown in the drawing, a plastic short cylindrical body is integrated into the hole of the metal shaft portion 2 and the male screw ridge 3 by press fitting, adhesion, fusion bonding, etc. As the plastic, the shape and dimensions as described above can be freely used.

[0027]

The present invention has the following significant effects due to the above-mentioned configuration.

With one type of anchor (according to claim 1), a screw fastener 24 of unknown dimensions in each home / site
Alternatively, the screw fasteners 24 of various sizes can be simply used as they are, and the work can be quick and easy. In addition, the screwing tool can be firmly attached by being screwed straight without tilting. Further, since the ratio of D ₂ and D ₁ is set to (1.2 to 3.5), it is practically preferable to prevent the application range of the screw fasteners 24 having different diameters from being narrowed, and other parts as anchors. The dimensions and strength of the can be prevented from becoming unbalanced.

(According to the second aspect), a strong rotation 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. Moreover,
The hole does not become unnecessarily long.

(According to claim 3 or 4) The screw fasteners 24 of different sizes can be easily applied, and are guided and guided into the hole portion 6 while smoothly self-tapping.

(According to the fifth aspect), quick, reliable, and firm mounting can be performed.

[Brief description of 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 cross-sectional explanatory view of FIG.

6 is an enlarged cross-sectional explanatory view of FIG.

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

FIG. 8 is a cross-sectional view illustrating the method of use.

[Explanation of symbols]

1 Drilling Blade 2 Shaft 2a Shaft Outer Perimeter 3 Male Thread Projection 6 Hole 7 Slit 11 Tapered 12 Cross Groove 13 Positive Screwdriver 13a Bit Tip 14 Anchor Base End Face 15 Hole Back Engagement 24 Mounting Screw Attachment D ₁ Opening end diameter D ₂ Minimum inner diameter P Base end T Depression dimension θ Inclination angle

Claims (5)

[Claims] 1. At least the inner surface of the opening end of the hole 6 into which the mounting screw fastener 24 is inserted is made of plastic, and a taper portion 11 having an outward diameter expansion is formed on the inner surface of the plastic opening end, The ratio of the opening end diameter D ₂ of the taper portion 11 to the innermost minimum diameter D ₁ is set to 1.2 to 3.5, and the screw fasteners 24 having different outer diameters are used.
An anchor characterized by being configured to be compatible with. 2. A cross groove portion 12 is recessed in the inner surface of the plastic opening end so that the bit tip 13a of the plus driver 13 can be inserted, and the base end P of the plus tooth of the bit tip 13a is 2.0 more than the anchor base end surface 14. mm ~ 5.0 mm subduction dimension T
The anchor according to claim 1, wherein the hole deep portion meshing portion 15 is formed so as to be inserted only by being depressed. 3. The anchor according to claim 1, wherein the inclination angle θ of the tapered portion 11 is set to 5 ° to 30 °. 4. The taper portion 11 comprises a plurality of outwardly expanded taper portions 11a, 11b, 11c ... And the plurality of taper portions 11 described above.
The anchor according to claim 1, wherein the anchor has a straight portion interposed between a, 11b, 11c ... 5. A piercing blade 1 is formed at the tip, a spiral male thread ridge 3 is provided on the outer periphery 2a of the shaft portion, and the shaft portion 2 is opened as the mounting screw fitting 24 is advanced. The anchor according to claim 1, 2, 3, or 4, wherein the slit portion 7 is formed so as to perform.