JPH1082099A - Anchor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to always set fixed force of an anchor in specific value by improving a form for expanding a sleeve to an anchor device for mounting fittings to the floor surface or the wall surface and to standardize mounting strength of the fittings to the floor surface, etc. SOLUTION: In an anchor device 1, an axle 3 is inserted in a sleeve 2, and a male screw 7 screwing a nut 4 therein and a diameter expansion section 10 having a diameter larger than an inside diameter of the sleeve 2 are provided to a part of the axle 3. A pin tail 5 is monolithically formed in the front end on the male screw 7 side of the axle 3 through a fracture groove 6. Then, the sleeve 2 is inserted into a concrete hole H, the nut 4 is rotated with a fastener 12 to move the axle 3 so that the diameter expansion section 10 can enter the sleeve 2, and the sleeve 2 is expanded and is pushed against the inside of the hole H to fix. In that case, reaction force of a fastening torque to the nut 4 is applied to the pin tail 5, and when the reaction force reaches specific value, the pin tail 5 is separated by fracture of the fracture groove 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor device for attaching an object to, for example, a concrete floor or wall surface, and more particularly to a measure for standardizing the attachment strength to a floor or the like.

[0002]

2. Description of the Related Art Conventionally, when a vending machine is fixed to a concrete floor or a signboard is fixed to a concrete wall, an anchor is embedded in concrete, and the signboard or the like is attached to the anchor. Attachments are to be installed. This type of anchor is provided with a hole for anchor fixing in concrete, and the anchor is embedded and fixed in this hole, and is generally called a post-installed anchor.

As an anchor of this type, a cylindrical sleeve is provided, and inside the concrete hole, by expanding the tip of the sleeve, the sleeve tip is pressed against the inner surface of the hole to increase the fixing force to concrete. A so-called metal expansion anchor is commonly used.

[0004] Further, there are two types of metal expansion anchors: a type called a driving method and a type called a fastening method. Hereinafter, representative anchors in each system will be described.

FIG. 6 shows a driving type anchor which is called a mandrel driving type. This anchor is a sleeve c having an external thread a at one end and an extension b at the other end.
And a nut d screwed onto the male screw a of the sleeve c;
A mandrel e is inserted through the sleeve c. In the sleeve c, only the expanded portion b has an inner diameter smaller than the outer diameter of the mandrel e, and a plurality of slits f for facilitating expansion are formed in the sleeve longitudinal direction. ing. Then, when fixing this anchor to concrete, as shown in FIG.
Is inserted into the hole g of concrete from the side of the extension b, and the mandrel e is driven into the inside of the sleeve c with a hammer or the like, so that the extension b is extended outward as shown in FIG. 6B. Thereby, the tip of the sleeve c is pressed against the inner surface of the hole g, and the sleeve c is fixed to the concrete.

FIG. 7 shows an anchor of a fastening system in which a male screw a is formed on the outer peripheral surface of a mandrel e, and the mandrel e is extended toward the front end portion at the front end portion of the mandrel e. A tapered portion h having a diameter is provided. When fixing the anchor to concrete, as shown in FIG.
Is inserted into the concrete hole g from the tapered portion h side, a nut d is screwed into the base end of the mandrel e, and the mandrel e is pulled out from the hole g by tightening the nut d. Move. At this time, as shown in FIG. 7B, the tapered portion h expands the distal end of the sleeve c, and the distal end of the sleeve c is pressed against the inner surface of the hole g in the same manner as in the above-described driving method. Thus, the sleeve c is fixed to the concrete together with the mandrel e.

[0007]

By the way, in the metal expansion anchor described above, there is a problem that the fixing force of the anchor to the concrete hole tends to vary.

More specifically, in the former driving-type anchor, if the driving force of the mandrel is not sufficient, the expansion amount of the expanded portion cannot be obtained sufficiently, and the fixing force to concrete becomes insufficient. On the other hand, in the case of the latter type of anchor, when the tightening torque of the nut is not sufficient, a sufficient amount of expansion cannot be obtained in the same manner as described above, and also in this case, the fixing force to concrete becomes insufficient.

As described above, it is difficult for the conventional metal expansion anchor to set the fixing force of the anchor to the concrete hole to a predetermined value, and this fixing force varies greatly depending on the skill level of the worker and the like, and the floor surface is hardly fixed. It was not possible to standardize the attachment strength of the attachment to the like.

The present invention has been made in view of this point, and by improving the form for expanding the sleeve, the fixing force of the anchor can always be set to a predetermined value, and the fixing force on the floor or the like can be improved. The purpose is to standardize the mounting strength of the mounting object.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method in which when a tightening torque of a nut, which influences an expanding force of a sleeve, reaches a predetermined value, a part of a mandrel is formed by a reaction force. In this case, the tightening torque can be standardized.

More specifically, the invention according to claim 1 is characterized in that a cylindrical sleeve is inserted through the sleeve, at least a part of which protrudes from an end edge of the sleeve, and a part of which is formed with an external thread. A mandrel, the other part of which has an enlarged portion having a diameter larger than the inner diameter of at least a part of the sleeve, and a nut screwed into a male screw of the mandrel, the sleeve having a hole formed in a predetermined mounting surface. With the nut inserted, by rotating the nut relative to the mandrel while abutting the nut against the mounting surface, the mandrel is moved so that the enlarged portion enters the sleeve, and the enlarged portion partially moves the sleeve. It presupposes an anchor device which is expanded so that the outer surface of the sleeve is pressed against the inner surface of the hole of the mounting surface to fix the sleeve in the hole. Then, a pin tail is formed at the tip end of the mandrel on the side where the male screw portion is formed, through a break portion between the mandrel and the male screw. This allows
The nut is rotated by a tightening machine having an inner wrench portion that fits into the pin tail and an outer wrench portion that fits into the nut and rotates relatively to the inner wrench portion. With respect to the pin tail, when the reaction force reaches a predetermined value, the pin tail is cut off by breaking of the break portion.

According to this specific matter, when the nut is rotated by the outer wrench portion of the tightening machine, the enlarged portion of the mandrel enters the sleeve, and the enlarged portion causes the sleeve to partially expand, so that the outer surface of the sleeve is attached. Pressed against the inner surface of the hole in the surface. Thereby, the sleeve is fixed to the hole with a high fixing force. Then, when the reaction force of the tightening torque to the nut reaches a predetermined value, the break portion is broken, and the pin tail is cut off. As a result, the operator can confirm that the nut has been tightened with the predetermined tightening torque, and can always secure a constant tightening torque regardless of the skill level of the operator. Is set at a constant value.

According to a second aspect of the present invention, in the anchor device of the first aspect, the enlarged portion is formed to have a uniform cross-sectional shape in the longitudinal direction of the mandrel.

According to this specific matter, the expanded portion of the sleeve is not expanded in a tapered shape, but the entire portion including the enlarged portion is uniformly expanded. Therefore, a large contact area between the outer surface of the sleeve and the inner surface of the hole is ensured.

According to a third aspect of the present invention, in the anchor device of the first aspect, the expanded portion of the sleeve is formed as a continuous cylindrical portion over the entire circumferential direction.

That is, this particular matter is that the slit is not provided in the expanded portion of the sleeve as in the related art.
For this reason, the processing operation of the sleeve can be simplified.

According to a fourth aspect of the present invention, in the anchor device of the first aspect, the sleeve is formed of a cylindrical body having a uniform cross-sectional shape throughout the entire length thereof, and the enlarged portion of the mandrel is formed of a sleeve. , And the enlarged portion is inserted into the distal end portion of the sleeve with the rotation of the nut to expand the sleeve.

According to a fifth aspect of the present invention, in the anchor device according to the first aspect, the sleeve is provided with a thick portion formed by bulging an inner surface at an intermediate position in a longitudinal direction of the sleeve inward, and an enlarged portion of the mandrel is provided. Has a larger diameter than the inner diameter of the thick portion and a smaller diameter than the inner diameter of the portion other than the thick portion of the sleeve.

According to these specific items, in the invention described in claim 4, the distal end portion of the sleeve is expanded, and in the invention described in claim 5, the intermediate portion in the longitudinal direction of the sleeve is expanded. Become.

[0021]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an anchor device 1 according to the present embodiment.
Is shown. As shown in FIG. 1, the anchor device 1
It comprises a cylindrical sleeve 2, a mandrel 3 inserted through the sleeve 2, and a nut 4 mounted on the mandrel 3. Hereinafter, each member will be described.

As shown in FIG. 2 (side view of the mandrel 3) and FIG. 3 (plan view of the mandrel 3), the mandrel 3 is made of a solid bar and has one end (upper end in FIG. 2). Is provided with a pin tail 5. As shown in FIG. 3, the pin tail 5 is formed of a dodecagonal prism having alternately formed peaks and valleys in the circumferential direction. A male thread 7 is formed below the pin tail 5 via a break groove 6 as a break. The male screw portion 7 is formed up to a substantially central position in the longitudinal direction of the mandrel 3. Further, the breaking groove 6 is a portion cut out in a V-shaped cross section over the entire circumference of the mandrel 3. When a rotation torque of a predetermined value or more acts on only the pin tail 5, the breaking groove 6 6, the pin tail 5 is separated from the mandrel 3.

The lower side of the male screw portion 7 is a cylindrical mandrel main body 8. Furthermore, this mandrel main body 8
An enlarged diameter portion 10 is formed at the lower end of the mandrel 3, which is the lower side of the shaft. The enlarged diameter portion 10 is formed continuously below the tapered portion 9 whose outer diameter increases as it goes downward from the lower end of the mandrel main body 8.
It is formed in a columnar shape with a larger diameter than that.

The sleeve 2 is a cylindrical member, and as shown in FIG. 1, the inner diameter thereof is slightly larger than the external thread portion 7 of the mandrel 3 and the mandrel main body 8 and is larger than that of the enlarged diameter portion 10. It is set small. Therefore, when the mandrel 3 is inserted into the sleeve 2 from the pin tail 5 side (inserted from the lower side in FIG. 1), the lower end of the sleeve 2 is in contact with the tapered portion 9 and Will be assembled. In this state, the upper end of the sleeve 2 is located at a position facing the external thread portion 7 of the mandrel 3.

The nut 4 is a nut with a seat having a seat 4a provided at the lower end thereof, and is screwed to the male thread portion 7 of the shaft 3. The outer diameter of the seat 4 a is set to be larger than the large diameter of the sleeve 2. As shown in FIG. 1, when the nut 4 is screwed into the male screw portion 7 in a state where the sleeve 2 and the mandrel 3 are assembled, the sleeve 2 is held between the tapered portion 9 and the seat 4a. Thus, the sleeve 2 is prevented from falling off the mandrel 3.

The anchor device 1 is constituted by integrally assembling the sleeve 2, the mandrel 3 and the nut 4 in this manner.

Next, an operation of fixing the anchor device 1 having the above-described structure to a concrete wall will be described with reference to FIG.

First, a hole H for fixing an anchor is made in a concrete wall by a drill or the like. The diameter of the hole H is slightly larger than the diameter of the enlarged diameter portion 10, and the depth thereof is determined when the anchor device 1 is inserted into the hole H from the enlarged diameter portion 10 side, as shown in FIG. As shown in FIG.
a is such that it can contact the wall surface. Such a hole H
After piercing, concrete chips remaining inside the hole H are sucked out by a dust collector.

After such drilling work, as shown in FIG. 4A, the anchor device 1 is inserted into the hole H from the enlarged diameter portion 10 side. Then, the process proceeds to a fixing operation for fixing the anchor device 1 to the hole H. In this fixing operation, FIG.
A tightening machine 12 as shown in (b) is used. This tightening machine 1
2 is an outer wrench portion 12a that can be fitted to the nut 4,
And an inner wrench portion 12b that can be fitted to the pin tail 5. In other words, the inside of the outer wrench portion 12a is formed into a hexagonal prism corresponding to the shape of the nut 4, and the inside of the inner wrench portion 12b is formed into a dodecagonal prism shape in which peaks and valleys are formed alternately according to the shape of the pin tail 5. Have been. Then, the outer wrench portion 12 is formed with respect to the inner wrench portion 12b.
a is rotatable. That is, the outer wrench 12a of the tightening machine 12 is attached to the nut 4,
2b are fitted into the pin tails 5, respectively, and the outer wrench 12
By rotating a, a fixing operation is performed.

When the outer wrench portion 12a is rotated in this manner, the nut 4 also rotates, and the mandrel 3 screwed to the nut 4 with the male screw portion 7 moves in the direction of being pulled out from the hole H. (See the arrow in FIG. 4 (b)). By this movement, as shown in FIG. 4 (b), the enlarged diameter portion 10 of the mandrel 3 enters the inside of the sleeve 2 and expands the distal end portion of the sleeve 2. Then, as the amount of the enlarged diameter portion 10 entering the sleeve 2 increases, the expansion area of the sleeve 2 also gradually increases. Due to this expansion, the outer peripheral surface of the sleeve 2 is pressed against the inner surface of the hole H, and the contact force fixes the sleeve 2 to the concrete wall.

Because of such an operation, in the final fixing operation, the reaction force of the tightening torque of the outer wrench portion 12a is taken by the pin tail 5. Therefore, when the reaction force exceeds a predetermined value, the breaking groove 6 breaks, and the pin tail 5 is cut off as shown in FIG. 4 (c). In other words, when the tightening torque of the outer wrench portion 12a reaches a predetermined value, the pin tail 5 is cut off, and the fixing operation ends.

In the state where the fixing operation has been completed in this manner, in the portion of the sleeve 2 where the enlarged diameter portion 10 of the mandrel 3 enters, the outer diameter dimension is increased according to the shape of the enlarged diameter portion 10. In this portion, a high contact force is obtained between the inner surface of the hole H and the anchor device 1 is fixed to the wall surface with a high fixing force.

When attaching an attachment such as a signboard to the anchor device 1, the nut 4 is once removed from the mandrel 3, and a hole for attaching the attachment is fitted to the mandrel 3, and the nut 4 is attached to the mandrel 3. This is performed by screwing into the male screw portion 7 of the above.

As described above, according to the anchor device 1 of the present embodiment, when the tightening torque of the outer wrench portion 12a reaches a predetermined value, the operator can confirm that the pin tail 5 has been separated and the fixing operation has been completed. Therefore, in this fixing operation, a constant tightening torque can always be ensured. That is, the outer peripheral surface of the expanded portion of the sleeve 2 and the hole H
Can be set to a constant value. For this reason, it is possible to solve a problem in which the driving force of the mandrel and the tightening torque of the nut vary as in the conventional metal expansion anchor, and the fixing force of the anchor to the concrete hole cannot be set to a constant value. That is, the attachment strength of the attachment to the wall or the like can be standardized, and an extremely reliable anchor device can be realized.

In the configuration of the present embodiment, the enlarged diameter portion 10 is formed in a columnar shape having a uniform outer diameter.
Is in contact with the inner surface of the hole H in a wide range. That is, by securing a large contact area, it is possible to further increase the fixing force.

Further, in this embodiment, no slit is formed in the sleeve 2 unlike the conventional metal expansion anchor.
For this reason, the work of processing the sleeve 2 can be simplified,
The manufacturing cost of the anchor device 1 can be reduced.

-Modification- Next, a modification of the present invention will be described. This example is a modification of the sleeve 2, and the other configuration is the same as that of the above-described embodiment. Therefore, only the configuration of the sleeve 2 will be described here.

As shown in FIG. 5, the sleeve 2 of this embodiment is
The thick portion 2a is formed slightly below the central portion in the longitudinal direction (the vertical direction in FIG. 5). In the portion other than the thick portion 2a, the inner diameter is set slightly larger than the outer diameter of the enlarged diameter portion 10 of the mandrel 3. The length of the sleeve 2 is determined by the mandrel 3 and the nut 4
Is set so that the lower end thereof substantially matches the lower end of the mandrel 3.

The thick portion 2a of the sleeve 2 is located above the tapered portion 9 of the mandrel 3 in a state where the three members 2, 3 and 4 are assembled, and the inner surface of the sleeve 2 There is an inside bulge. Thus, the inner diameter of the thick portion 2a is set smaller than the outer diameter of the enlarged diameter portion 10 of the mandrel 3.

Due to such a configuration, in the fixing operation of the anchor device 1, the mandrel 3 is moved by the rotation operation of the nut 4, as shown by a virtual line in FIG. The enlarged diameter portion 10 expands the thick portion 2a of the sleeve 2 to the outside, so that a high contact force can be obtained between the outer peripheral surface of the sleeve 2 and the inner surface of the concrete hole. .

In the above-described embodiment, the case where the anchor device 1 is fixed to the concrete wall has been described. However, the present invention is not limited to this, and is applied to the anchor device fixed to the concrete floor surface. It is also possible. Further, the shape of the pin tail 5 is not limited to a dodecagonal prism.

[0042]

As described above, according to the present invention, the following effects can be obtained. According to the first aspect of the present invention, a pin tail is formed at the tip end of the mandrel inserted through the sleeve through a broken portion to expand the sleeve with respect to the anchor device for attaching the attachment to the floor surface or the wall surface. For this reason, the reaction force of the tightening torque of the nut to be rotated is taken as a pin tail, and when the reaction force reaches a predetermined value, the pin tail is cut off due to breakage of the break portion. For this reason, the operator can confirm that the nut has been tightened with the predetermined tightening torque due to the breakage of the pin tail, and can always secure a constant tightening torque irrespective of the skill level of the operator, so that the expanded portion of the sleeve The contact force between the outer surface of the mounting surface and the inner surface of the hole of the mounting surface is set to a constant value. Therefore, it is possible to solve the problem that the driving force of the mandrel and the tightening torque of the nut vary as in the conventional metal expansion anchor, and the fixing force of the anchor to the concrete hole cannot be set to a constant value. That is, the attachment strength of the attachment to the wall or the like can be standardized, and an extremely reliable anchor device can be realized.

According to the second aspect of the present invention, the enlarged portion is
By forming the mandrel with a uniform cross-sectional shape over the longitudinal direction of the mandrel, the entire portion of the sleeve into which the enlarged portion has entered is evenly expanded. For this reason, a large contact area between the outer surface of the sleeve and the inner surface of the hole is secured, and the sleeve can be fixed with a higher fixing force, so that the reliability of the anchor device can be further improved.

According to the third aspect of the present invention, since the conventional slit is not provided in the expanded portion of the sleeve, the working of the sleeve can be simplified and the production cost can be reduced. .

In the fourth aspect of the present invention, the distal end portion of the sleeve is expanded, and in the fifth aspect of the present invention, the intermediate portion in the longitudinal direction of the sleeve is expanded. And the degree of freedom in designing the anchor device can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an anchor device.

FIG. 2 is a side view of a mandrel.

FIG. 3 is a plan view of a mandrel.

FIG. 4 is a diagram for explaining a fixing operation of the anchor device.

FIG. 5 is a diagram corresponding to FIG. 1 in a modified example.

FIG. 6 is a view showing a driving-type metal expansion anchor as a conventional example.

FIG. 7 is a view showing a metal expansion anchor of a fastening system as a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anchor device 2 Sleeve 3 Mandrel 4 Nut 5 Pin tail 6 Break groove (break part) 7 Male thread part 10 Large diameter part 12 Tightening machine 12a Outer wrench part 12b Inner wrench part H hole

Claims (5)

[Claims] 1. A sleeve having a tubular shape, inserted through the sleeve, at least a part of which protrudes from an edge of the sleeve, and a part of which is formed with an external thread, while another part is formed of at least a part of the sleeve. A mandrel having an enlarged portion having a diameter larger than the inner diameter, and a nut screwed into a male screw of the mandrel, wherein the nut is mounted on a mounting surface with the sleeve inserted into a hole formed on a predetermined mounting surface. By rotating the mandrel relative to the mandrel while contacting the mandrel, the mandrel moves so that the enlarged portion enters the sleeve, and the enlarged portion causes the sleeve to partially expand, so that the outer surface of the sleeve becomes the mounting surface. In the anchor device, the sleeve is fixed to the hole by being pressed against the inner surface of the hole. A pin tail is formed through the nut tail, and the nut is rotated by a tightening machine including an inner wrench portion that fits into the pin tail and an outer wrench portion that fits into the nut and rotates relatively to the inner wrench portion. An anchor device, wherein a reaction force of a tightening torque to a nut is taken by a pin tail, and when the reaction force reaches a predetermined value, the pin tail is cut off by breaking of a break portion. 2. The anchor device according to claim 1, wherein the enlarged portion has a uniform cross-sectional shape in the longitudinal direction of the mandrel. 3. The anchor device according to claim 1, wherein the expanded portion of the sleeve is a tubular portion that is continuous over the entire circumference thereof. 4. The anchor device according to claim 1, wherein the sleeve is formed of a cylindrical body having a uniform cross-sectional shape throughout the entire length thereof, and the enlarged portion of the mandrel projects from an end edge of the sleeve. An anchor device wherein the sleeve is expanded by entering a distal end portion of the sleeve as the nut rotates. 5. The anchor device according to claim 1, wherein the sleeve has a thick portion in which an inner surface at an intermediate position in the longitudinal direction bulges inward, and an outer diameter of the enlarged portion of the mandrel is An anchor device characterized in that the diameter is set larger than the inner diameter of the thick part and smaller than the inner diameter of the part other than the thick part in the sleeve.