JP2000087930A - Anchor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw anchor, capable of being screwed with a general- purpose tool on hand without using expensive special tool by using a low-cost disposable holder as a screwing tool, and not penetrating through even a thin board. SOLUTION: A shaft part 22 has a tapered upper half part 22a whose diameter is enlarged toward a head part 23 formed at its end part, while a lower half part 22b is formed with a screw thread 25 on its outer circumference. The screw thread 25 whose diameter is enlarged toward the head part 23 has an equal root width overall. The screw thread 25 has a flat part 24 at its top part, which inclines toward the head part 23, and whose width is narrowed toward the head part 23. A bolt-screwing hole 26 is penetratingly formed in the shaft part 22 along its axis, while plural bolt-screwing projecting stripes are formed along an axial direction on an inner circumferential face of the bolt-screwing hole 26. Engaging parts 29 for a screwing holder 31 are recessed at plural positions on a periphery of the bolt-screwing hole 26 at an end face of the head part 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor and an anchor device used to attach various objects to walls and ceilings made of ALC (foam concrete) or gypsum board, which are particularly brittle in material.

[0002]

2. Description of the Related Art When mounting various objects on a wall or ceiling using ALC or gypsum board, since the ALC or gypsum board is brittle in material, an anchor which exhibits pull-out resistance is attached to the board. Various objects are fastened with bolts that are screwed into the machine.

FIG. 7 shows a driving type as a conventional anchor, and FIG. 8 shows a screwing type similarly. The former driving type anchor 1 has a screw hole 3 for screwing a bolt to a cylindrical anchor body 2. A plurality of anchor pins 4 protruding from the peripheral surface of the tubular anchor body 2.
And a wedge member 5 for pushing out the anchor pin 4 into the tubular anchor main body 2.

[0004] In this anchor 1, with the tubular anchor body 2 inserted into the prepared hole A 1 formed in the board A, a wedge member 5 is inserted by inserting a shaft-like driving rod into the tubular anchor body 2. By driving in the axial direction, the anchor pin 4 is pushed out to prevent the anchor pin 4 from coming off, and thereafter various objects are fastened to the board A by bolts which are screwed into the screw holes 3 of the tubular anchor body 2.

[0005] Incidentally, in the former driving type anchor 1, the cylindrical anchor main body 2 needs to be at least 50 mm long due to the screw hole 3 and the anchor pin 4 portion. Can not be used for the board A. Because board A
When the wedge member 5 is driven in a state in which the tubular anchor body 2 is inserted into the prepared hole A1 formed in the hole, the tubular anchor body 2 falls out to the back side of the board A due to the impact force applied to the anchor body 2. Because.

In contrast to such a driving type anchor 1, the latter screw type anchor 11 has a head portion 13 at one end of a shaft portion 12, and a bolt screw hole 14 penetrates along the axis. A plurality of bolt screwing ridges 16 are provided on the inner peripheral surface of the bolt screwing hole 14 along the axial direction.
2 is provided with a screw thread 15 on the outer peripheral surface, and is screwed into a prepared hole A1 drilled in the board A, so that even in the case of a thin board A, there is no bottom-out on the back side, and only resin molding is performed. And has the advantage of being inexpensive in terms of cost.

[0007]

However, in the latter screw-type anchor 11, the rotation of the tool for screwing is transmitted to the anchor 11 by engaging with the bolt thread 16. In the process of screwing in, the bolt screwing projection 16 may be damaged, and there is a problem that the bolt cannot be sufficiently fastened to the anchor 11.

Further, since the anchor 11 has a unique structure in which a tool engagement portion for screwing is required, an expensive dedicated tool is required for the screwing, and an economic burden is increased. Moreover, there is a problem that the work can only be performed manually.

[0009] Therefore, an object of the present invention is to provide a screw-in type anchor by using an inexpensive and disposable holder for screwing in, so that the screwing-in operation can be carried out using a general-purpose electric or manual tool that is hand-held. The use of special tools can be omitted, and the bolted ridges provided on the inner peripheral surface of the bolted holes are not damaged when screwing in. There is no need to provide anchors and anchoring devices.

[0010]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a portion of the shaft portion reaching the head provided at one end side of the shaft portion having a large diameter toward the head. It is formed in a tapered shape, the diameter increases toward the head from the middle of the shaft part to the outer periphery on the other end side, the root width is the same over the entire length, and the top part is from the head side to the tip side Inclined, and
A plurality of bolt screw ridges are provided on the inner peripheral surface of a bolt screw hole provided so as to have a flat portion that becomes narrower toward the head side and penetrate the shaft portion along the axis. It is provided along the axial direction, and adopts a configuration in which the engaging portion of the screwing holder is recessed at a plurality of positions around the bolt screw hole on the end face of the head.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided a configuration in which a recess having a shape narrowing toward the head is provided on the outer peripheral surface of the tapered portion reaching the head from the middle of the shaft. It has been adopted.

According to a third aspect of the present invention, a portion reaching the head provided at one end from the middle of the shaft is formed in a tapered shape having a large diameter toward the head, and the other end is provided from the middle of the shaft. In the outer circumference of the flat part, the diameter increases toward the head side, the width of the root is the same over the entire length, the top part is inclined from the head side to the tip side, and becomes narrower closer to the head side An anchor in which a plurality of bolt screwing ridges are provided along the axial direction on the inner peripheral surface of a bolt screwing hole provided so as to penetrate the shaft portion along the axis, and It consists of a combination with a holder for screwing an anchor, and at the end face of the head of the anchor, engaging portions of a screwing holder are recessed at a plurality of positions around a bolt screw hole.
Having a cross-sectional shape that fits the bolt screw hole, a head for rotation operation is provided at one end of the shaft portion through which the square hole passes along the axis,
A configuration in which a plurality of protrusions that engage with the engagement portion of the anchor are provided on the lower surface side of the head is adopted.

[0013]

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

As shown in the figure, a circular shaft portion 22 of an anchor 21 formed using a hard synthetic resin is
The upper half 22a and the lower half 22b are formed at the middle of the boundary, and the upper half 22a is formed in a tapered shape having a large diameter from the boundary toward the circular head 23 provided at the end, Also, the lower half portion 22b is also formed into a gentle taper having a smaller diameter from the boundary portion toward the end portion.
The diameter increases toward the head 23 side, the width of the root is the same over the entire length, the top is inclined such that the diameter decreases from the head 23 side to the tip side, and becomes narrower toward the head 23 side. A thread 25 having a flat portion 24 is provided.

The diameter D2 of the corner portion of the upper half portion 22a and the head portion 23 connected to the upper half portion 22a is D1 with respect to the diameter D1 of the boundary portion between the upper half portion 22a and the lower half portion 22b of the shaft portion 22.
<D2, the diameter D2 of the corner portion of the upper half 22a and the head 23 connected thereto and the maximum diameter D3 of the screw thread are:
D2.gtoreq.D3, and the thread 25 has the same thread angle over its entire length, and the taper angle d1 of the flat portion 24 is d1> d2 with respect to the taper angle d2 of the lower half 22b of the shaft portion 22. And d1> d3 with respect to the taper angle d3 of the upper half 22a. Therefore, as shown in FIG. 2C, the flat portion becomes higher and narrower as it is located closer to the head 23 from the end of the lower half portion 22b.

FIG. 6 shows the upper half 22 of the anchor 21.
a shows another shape of the head 23 from a, the head 23 is formed to have a small thickness, and the upper half portion 22a has a straight conical shape with an angle at the boundary with the head 23.

The shaft portion 22 is provided with a bolt screw hole 26 penetrating along the axis. The bolt screw hole 26 has an inner diameter to which the outer diameter of the screw thread of the bolt to be fastened just fits, as shown in FIG. Bolt thread 27
Are provided along the entire length along the axial direction, and the screw thread of the bolt screwed into the bolt screw hole 26 has its thread cut into the screw protrusion 27.

An engaging groove 28 for a screwing holder to be described later is provided over the entire length at a position between the bolt screwing ridges 27 on the inner peripheral surface of the bolt screwing hole 26 and the head 2
As shown in FIG. 1 (c), a bolt screw hole 26
An engagement portion 29 of the screwing holder is provided at a position corresponding to each engagement groove 28 around the periphery of the groove.

In the shaft portion 22, recesses 30 are provided at a plurality of locations on the outer peripheral surface of the upper half portion 22a to accommodate cutting waste generated when the anchor 21 is screwed. This hollow 3
Numeral 0 is formed in a triangular shape which becomes narrower toward the head 23 side, and compresses the cutting waste housed by the screwing of the anchor 21 and the triangular shape.

FIGS. 5A to 5D show the anchor 2
1 shows a holder 31 used for screwing, has a cross-sectional shape adapted to the bolt screw hole 26, and has a head portion 34 for rotation operation at one end of a shaft portion 33 through which a square hole 32 penetrates along the axis.
And a plurality of protrusions 35 that engage with the engagement portions 29 of the anchor 21 are provided on the lower surface side of the head 34. The holder 31 is manufactured by casting using an inexpensive metal material that can be used disposably.
It has a length equal to or slightly shorter than the anchor 21, and the outer surface of this shaft portion 33 has a concave groove 36 in which the bolt screwing ridge 27 is accommodated, and a ridge 37 fitted in the engagement groove 28. Is provided.

A square hole 32 penetrating the shaft portion 33 is a hexagonal hole into which a hexagonal screwdriver is fitted.
1 is formed on the same hexagonal head as the bolt to be fastened to
Reference numerals 5 are provided at four corner portions on the lower surface side of the shaft portion 33 and the head portion 34.

The anchor and the holder according to the present invention have the above-described structure. In order to attach various objects to a wall or ceiling using ALC (cellular concrete) or gypsum board, as shown in FIG. In the board A, a pilot hole A1 having an inner diameter to which the lower half portion 22b of the anchor 21 fits is formed, and FIG.
As shown in (b), the shaft part 33 of the holder 31 is inserted into the bolt screw hole 26 of the anchor 21, and the convex part 35 is engaged with the engaging part 29.
With the anchor 21 and the holder 31 engaged with each other in a set state, the tip of the shaft portion 22 of the anchor 21 is inserted into the prepared hole A1, and a tool engaged with the head 34 of the holder 31 is used.
The rotation is given to the anchor 21 via the holder 31.

By the rotation of the anchor 21, the thread 25 provided on the outer periphery of the shaft portion 22 cuts into the inner periphery of the pilot hole A1 of the board A and enters, and as shown in FIG. The screwing is completed in a state of contacting the surface of A, and thereafter, the holder 31 is pulled out from the anchor 21 and removed.

When screwing the anchor 21,
The diameter of the screw thread 25 increases toward the head 23 side,
The width of the root is the same in the entire length, and the top portion has a flat portion 24 which is inclined toward the head 23 and becomes narrower as it approaches the head 23 side. , The penetration becomes easy, and the diameter of the head 23 side is large, so that the fastening force increases as the screwing proceeds.

The upper half portion 22a of the shaft portion 22 of the anchor 21 has a large diameter toward the head portion 23, so that the upper half portion 22a enters the lower hole A1 while rotating into the lower hole A1.
Of the board A cut by the thread 25 is stored in a compressed state in a recess 30 provided on the outer periphery of the upper half portion 22a. Is increased, and the anchor 21 can be firmly fixed to the board A.

Further, the bolt screw hole 26 of the anchor 21
In the shaft portion 33 of the holder 31 inserted into the groove, the concave groove 36 is fitted in the bolt screwing ridge 27, the ridge 37 is fitted in the engaging groove 28, and the convex portion 35 is Since it is engaged, when the holder 31 applies rotation to the anchor 21, no load is applied to the bolt screwing ridge 27,
Therefore, there is no possibility that the bolt thread 27 will be damaged.

FIGS. 4A to 4D show different examples of tools used to engage and rotate the head 34 of the holder 31 for screwing the anchor 21.
3A, a hexagonal screwdriver 42 attached to a rotary electric tool 41 is inserted into a square hole 32 of a holder 31 to impart rotation.

FIG. 4B shows a socket wrench 43 attached to the rotary electric tool 41 which is fitted to the head 34 of the holder 31 to impart rotation.
Hex wrench 44 attached to the square hole 32 of the holder 31
4 (d), the holder 31 is rotated.
A monkey wrench 45 or a ratchet wrench is engaged with the head 34 to impart rotation.

These electric and manual tools are generally used on a construction site. Therefore, if the combination of the holder 31 enables the screwing of the anchor 21 by using these tools, Eliminates the need for conventional dedicated tools.

FIG. 3B shows a state in which various objects B are attached to the anchor 21 screwed into the board A. The various objects B are stacked on the board A, and the bolts C inserted into the holes of the various objects B are attached to the anchor 21. The screw thread of the bolt C bites into a screwing ridge 27 provided on the inner peripheral surface of the screwing hole 26, and the various objects B are attached to the board A by tightening the bolt C. Can be fixed.

[0031]

As described above, according to the anchor of the present invention, the portion reaching the head provided at one end from the middle of the shaft is formed in a tapered shape having a large diameter toward the head. From the middle of the part to the outer periphery of the other end side, the diameter increases toward the head side, the root width is the same over the entire length, the top is inclined toward the head side, and the narrower the closer to the head side ALC with fragile material due to the presence of a thread with a flattened part
Not only can it be screwed smoothly into (foam concrete) or gypsum board, but also the board can be compressed at the large diameter taper part on the head side and a strong screwed state without loosening can be obtained. Tightening bolts screwed into this anchor Thus, various objects can be firmly fixed to the board, and even if the board is thin, it does not run out to the back side.

Further, since a separate holder is used in combination with the screwing of the anchor, a general-purpose tool can be used for the screwing of the anchor in building work and the like, and a special tool for screwing the anchor becomes unnecessary. By making the holder disposable, the screwing of the anchor can be performed at low cost.

Further, the holder is structured such that a load is not applied to the bolt screwing ridge provided on the inner peripheral surface of the bolt screwing hole when the screwing rotation is applied to the anchor. There is no damage of the bolt screwing ridge, and the screwed fastening state of the bolt to the anchor can be reliably obtained.

[Brief description of the drawings]

1A is a front view of an anchor, FIG. 1B is a front view of the same longitudinal section, FIG. 1C is a plan view of the same, and FIG. 1D is an arrow dd of FIG.
Cross section along

2A is a perspective view of an anchor, FIG. 2B is a perspective view showing a combination of an anchor and a holder, and FIG. 2C is an enlarged sectional view of a thread;

3A is a cross-sectional view in which an anchor is screwed into a board, and FIG. 3B is a cross-sectional view showing a state in which various objects are attached to the anchor with bolts.

4A to 4D are front views showing different examples of an anchor screwing tool using a holder.

5A is a front view of the holder, FIG. 5B is a vertical front view of the same, FIG. 5C is a cross-sectional bottom view of the same, and FIG. 5D is a perspective view of the holder.

FIG. 6 is a front view showing the upper half of the anchor and another shape of the head;

FIG. 7 is a sectional view showing a fastening state of a conventional driving type anchor.

FIG. 8A is a cross-sectional view of a conventional screw-in type anchor in a fastened state, and FIG. 8B is a cross-sectional view of the anchor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Anchor 22 Shaft part 23 Head 24 Flat part 25 Thread 26 Bolt screw hole 27 Bolt screw ridge 29 Engagement part 31 Holder 32 Square hole 33 Shaft part 34 Head 35 Convex part

Claims (3)

[Claims] 1. A part which reaches a head provided on one end side from a middle of a shaft portion is formed in a tapered shape having a large diameter toward the head.
From the middle of the shaft portion to the outer periphery on the other end side, the diameter increases toward the head side, the root width is the same over the entire length, the top is inclined from the head side to the tip side, and the head is A plurality of bolt screwing ridges are provided in the axial direction on the inner peripheral surface of a bolt screwing hole provided to penetrate the shaft portion along the axis. Provided along, at the end face of the head at a plurality of positions around the bolt screw hole,
Anchor with recessed engaging part of screw holder. 2. The anchor according to claim 1, wherein a recess having a shape narrowing toward the head is provided on the outer peripheral surface of the tapered portion reaching the head from the middle of the shaft. 3. A portion reaching the head provided on one end side from the middle of the shaft portion is formed in a tapered shape having a large diameter toward the head,
From the middle of the shaft portion to the outer periphery on the other end side, the diameter increases toward the head side, the root width is the same over the entire length, the top is inclined from the head side to the tip side, and the head is A plurality of bolt screwing ridges are provided on the inner peripheral surface of a bolt screwing hole provided to penetrate the shaft portion along the axis, and a plurality of bolt screwing ridges are provided in the axial direction. And a holder for screwing the anchor, and engaging portions of the screwing holder are recessed at a plurality of positions around the bolt screw hole on the end face of the head of the anchor. The holder has a cross-sectional shape adapted to the bolt screw hole, and has a head for rotation operation at one end of a shaft portion through which the square hole passes along the axis, and a lower surface side of the head. An arm formed by providing a plurality of convex portions that engage with the engaging portion of the anchor. Car equipment.