JPH10110476A - Anchor metal fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage in construction materials or hitting sounds by hitting an anchor socket, at the same time, reduce the number of components and to make it possible to save rotational control force of an anchor bolt. SOLUTION: An anchor metal fixture is equipped with an anchor socket 2 pressed into a concrete hole 1 to fix and an anchor bolt 3 screwed in from an opening of one end 5 of the anchor socket 2. Then, while a slit 13 is formed in the other end 6 of the anchor socket 2, a head 16 pressed into the inside circumference 6b and widely opened is monolithically formed in the front end of an axis section of the anchor bolt 3. The whole circumference 6a of the other end is so formed that it is provided with uniform diameter and, at the same time, five circular ribs 10a-11b and 12 provided to the circumference 6a are gradually formed in a state of expanded diameter from the central part 7 side to the front end of the other end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor fitting for expanding an end of an anchor socket inserted into a fixing hole formed in a wall or the like with an anchor bolt screwed into the anchor socket.

[0002]

2. Description of the Related Art Conventionally, many types of post-installed anchors of this type have been provided.
No. 8413 discloses an anchor fitting in which a vertically split groove is formed at one end of a sleeve, and a plug having a trapezoidal cross section is inserted into the groove, and the sleeve is driven into the hole by a special tool. Because the sleeve stops at the bottom and expands one end of the sleeve, the sleeve is supported in the hole, and when a bolt is screwed into the sleeve, the bolt is supported by the sleeve. A similar thing to this is disclosed in
There is an anchor fitting described in JP-A-330525 and JP-A-6-116953.

In the driving anchor described in JP-A-59-147110, a vertically split groove is formed at one end of a sleeve, and a conical taper having a predetermined length is formed on an inner surface thereof. When the push-out member inserted into the sleeve is driven toward the bottom of the hole, the tapered portion expands. Similar to this, there is an anchor fitting described in Japanese Utility Model Laid-Open No. 5-94333.

[0004]

However, in the above-mentioned conventional anchor, the sleeve and the push-out member are driven into the hole in order to expand one end of the sleeve. Therefore, for example, when attaching a metal fitting for hanging a picture to a wall or a metal fitting for preventing furniture from falling down using the anchor metal, for example, a wall or a decorative wall provided separately from the wall. May be damaged or destroyed, or the wallpaper or the like may peel off. In addition, the vibration and impact at the time of the driving are so severe that it inconveniences neighbors and the like.

Further, when the sleeve or the like is expanded by impact, the depth of the hole formed in the wall must be made accurate. If it is too deep, the required required pull-out strength cannot be obtained. In addition, it is difficult to confirm the strength, and there is a drawback that the length of the projection from the wall is irregular and the appearance is deteriorated.

When driving the sleeve into the wall,
A special tool consisting of a driving rod having a head into which the sleeve is screwed is required, and without it, there is an inconvenience that the hem of the sleeve cannot be expanded.

Furthermore, most of the anchors provided so far require at least three or more parts, so that a large number of parts not only increases the cost but also reduces the efficiency of the manufacturing operation. Inviting.

Further, there is no special means for surely checking whether or not the hem of each sleeve has expanded after attaching a large number of anchors to the wall or the ceiling. When the bolt is screwed onto the sleeve and the load is not fully supported on the wall or ceiling, there is a risk that the sleeve will easily fall out of the hole.

Accordingly, the present invention provides an anchor having a small number of parts, which can be firmly supported without smashing to expand a sleeve end or the like.

[0010]

According to the first aspect of the present invention,
A cylindrical anchor socket having both ends opened, and an anchor bolt screwed into the inside from one end side opening of the anchor socket, and a vertical split groove along the axial direction is formed on a peripheral wall at the other end of the anchor bolt. In addition, the outer diameter of the entire other end portion is uniformly formed, and the outer diameters of the plurality of substantially annular ribs formed on the outer peripheral surface of the other end portion are set to the central side in the axial direction of the anchor socket. The head is formed integrally with the head of the anchor bolt at the tip of the shaft part while the other end of the anchor socket is expanded through the vertical groove. And

According to a second aspect of the present invention, the relationship between the tightening torque of the anchor bolt and the sliding friction torque of the head against the inner peripheral surface of the other end of the anchor socket is provided at the boundary between the shaft of the anchor bolt and the head. A cutting groove for cutting the boundary portion by a predetermined torsional torque generated by a specific torque difference.

The invention according to claim 3 is characterized in that the vertically split groove at the other end of the anchor socket extends almost to the center of the anchor socket.

[0013]

1 to 3 show an embodiment of an anchor according to the present invention. The anchor is a tube which is inserted and fixed into a concrete hole 1 of a ceiling wall C made of a building material. An anchor socket 2 having the shape of an arrow, and an anchor bolt 3 screwed into the interior of the anchor socket 2 from one end opening. The concrete hole 1 is previously drilled in the ceiling wall C from below.

The anchor socket 2 is shown in FIGS.
As shown in FIGS. 1A and 1B, a cylindrical main body 4 having a predetermined length and having openings 4a and 4b formed at both ends is provided. A plurality of torsion-shaped outer peripheral surfaces 5a of one end 5 of the cylindrical main body 4 are provided. The rib 8 is formed substantially along the axial direction, and a female screw portion 9 is formed on the inner peripheral surface of the one end portion 5 so as to extend to the inner peripheral surface of the central portion 7. The peripheral wall near the opening 4a of the one end portion 5
The outer peripheral surface is formed in a tapered shape having a large diameter toward the bottom in the figure, and a lower end surface 5b having the maximum diameter is formed in an annular shape.

On the other hand, the other end 6 of the cylindrical main body 4 is
a is set to a uniform diameter from the outer peripheral surface 7a of the central portion 7 to the leading edge on the opening 4b side, and the inner peripheral surface 6b
Similarly, a uniform diameter is formed from the inner peripheral surface of the central portion 7 to the hole edge 4c of the opening 4a. Also, four annular ribs 10a, 10b, 11a, 11 are provided on the outer peripheral surface 6a of the other end.
b are formed at equally spaced positions in the axial direction, and an annular rib 12 is also integrally formed at the tip, and each of the ribs 10a, 10b, 11a, 11b, 12 has an outer diameter shown in FIG. 2A. From the lowermost rib 10a to the uppermost rib 12 as shown, it is formed to have a gradually larger diameter at an angle θ.

Further, on the peripheral wall of the other end portion 6, the other end portion 6 is provided.
A slit 13 is formed, which is a four-segment vertical groove that allows deformation in the diameter-enlarging or contracting direction. The slit 13a on the center 7 side is formed to be narrower than the other end 6 side.

The twisted rib 8 at the one end 5 is
Each of the annular ribs 10, 11, and 12 at the other end 6 is formed in a substantially trapezoidal cross-sectional shape with the lower end side notched in the figure, and has a claw shape. As described above, the outer diameter of the rib 10a on the maximum step side is set to be slightly larger than the inner diameter of the concrete hole 1, and the outer diameter is set to gradually increase toward the upper step.

The anchor bolt 3 is shown in FIGS.
A and B, a hexagonal head 14 and the head 14
A shaft portion 15 integrally provided at the center of one end surface 14a of the first shaft portion, and a head 16 integrally provided at the tip of the shaft portion 15.

When the head 14 is screwed into the anchor socket 2 on the outer peripheral side of the one end face 14a, the head 14 is crushed by a pressing force against a lower surface of an angle member 21 to be described later and is pressed by a small diameter projection 14b.
Are provided.

The shaft portion 15 has a predetermined length which is completely screwed into the anchor socket 2, and has a male screw portion 17 which is screwed with the female screw portion 9 of the anchor socket 2 over the entire outer peripheral surface except for the tip portion 15a. Are formed.

The head 16 is provided with a tip 15 of a shaft 15.
a is formed in a shaft shape having substantially the same diameter as that of the shaft portion 15, and the length in the axial direction is such that the tip portion 16 a protrudes from the other end opening 4 b when inserted into the anchor socket 2 together with the length of the shaft portion 15. The length is set, and the outer peripheral surface 16b is a flat surface without a male screw or the like. In addition, the distal end portion 16a of the head 16 has an outer peripheral surface 16b formed as a tapered surface having a gradually decreasing diameter toward the distal end edge,
At the central position in the axial direction, an annular locking claw 18 serving as locking means for locking to the opening edge 4c of the other end portion of the anchor socket 2 when inserted and restricting twisting into the interior of the anchor socket 2 is integrally formed. Is formed.

An annular cutting groove 20 is formed at the boundary 19 between the tip 15a of the shaft 15 and the head 16. When the head 16 is inserted into the anchor socket 2 and the anchor bolt 3 is tightened through the shaft portion 16 and the male and female screw portions 9 and 17 of the one end portion 5, the cutting groove 20 is used for the anchor bolt 3. 3 and the outer peripheral surface 16b of the head 16 with respect to the inner peripheral surface 6b of the other end 6.
The depth is set to a depth that can be cut by a predetermined or more torsional torque generated at the boundary portion 19 due to a torque difference between the sliding friction torque and the sliding friction torque.

The operation of the present embodiment will be described below with reference to FIGS. That is, first, as shown in FIG. 4, the anchor socket 2 is inserted into the concrete hole 1 from the other end portion 6 while lightly tapping the one end portion 5 from below with a hammer or the like to perform positioning.

Thereafter, when one end 5 is hit with a hammer or the like and pushed into the concrete hole 1, the anchor socket 2 is press-fitted while being swung by the guide action of the torsion rib 8, and the respective annular portions of the other end 6 are formed. Ribs 10a, 10b, 11
A pressing force is applied inward to the inner peripheral surface 1a of the concrete hole 1 to the a, 11b, and 12, and the other end 6 is pushed in through a plurality of slits 13 while being reduced in diameter. In particular, the tip end side has a large diameter deformation amount due to the annular rib 12 having the maximum diameter, and conversely, a large reaction force is generated in the diameter expansion direction, and a relatively strong force is applied to the inner peripheral surface 1a of the concrete hole 1. The whole anchor socket 2 can be firmly held. Each of the torsional ribs 8 and the annular ribs 10
Since a to 11b increase the frictional resistance due to the biting of the concrete hole 1 with the inner peripheral surface 1a, the anchor socket 2 can be more firmly and surely temporarily fixed.
Therefore, it is not necessary to hold the anchor socket 2 by hand particularly in the upward operation, and the subsequent operation becomes extremely easy.

Further, when the anchor socket 2 is press-fitted to the end, the annular ribs 11a, 11b, 12
And a strong temporary fixing state is maintained by the reaction force in the diameter-enlarging direction, and the lower end surface 5b of the largest diameter near the opening 4a of the one end portion 5 is pressed against the opening edge 1b of the concrete hole 1 to function as a stopper. In addition, excessive driving of the anchor socket 2 can be prevented. In addition, the opening edge 1b of the concrete hole 1 is closed in a watertight manner, so that a sealing function is exerted to prevent water from falling from the concrete hole 1 and the appearance can be improved.

Further, since the torsion rib 8 is formed in a substantially triangular cross section, the cutability of the concrete hole 1 with respect to the inner peripheral surface 1a is improved, and the annular rib 1 is formed.
Since the hooks 0a to 11b and 12 are claw-shaped, a strong locking force with respect to the inner peripheral surface 1a after the press-fitting is obtained, and the above-mentioned temporary fixing force can be further promoted.

Next, the anchor bolt 3 is screwed into the anchor socket 2 which has been temporarily and temporarily fixed. First, the distal end 16a of the head 16 is connected to one end 5a.
Male screw portion 1 of shaft portion 15 while being inserted through opening 4a of
7 is screwed into the female thread 9 on the inner peripheral surface of the one end 5, and then
The head 14 is turned by a tool such as a spanner and screwed in.
Then, as shown in FIG. 5, the outer peripheral surface 16b of the head 16 rotating synchronously with the shaft portion 15 gradually and strongly comes into pressure contact with the inner peripheral surface 6b of the other end portion 6 in the reduced diameter state of the anchor socket 2.

When a predetermined amount of torsional torque is generated at the boundary 19 due to a torque difference between the sliding friction torque caused by the rotation of the anchor bolt 3 and the tightening rotation torque of the anchor bolt 3, the boundary 19 is cut into the cutting groove 20. Is cut off by That is, the shaft portion 15 and the head 16 are separated during the screwing of the anchor bolt 3.

Thereafter, when the anchor bolt 3 is further screwed in, the head 16 pushes the inside of the other end portion 6 in a straight line state without rotating thereafter by the pressing force of the shaft portion 15. At the same time as the distal end portion 16a projects from the other end portion 6 opening 4b as shown in FIG. 6, the locking claw 1 is caused by a strong reaction force in the diameter-reducing direction of the large-diameter annular rib 12 that has been expanded.
8 firmly engages with the hole edge 4c of the opening 4b. At this point, since the other end 6 is pushed open in the radially expanding direction through the slit 13 by the head 16, each of the annular ribs 10a to 10a
11b and 12 penetrate more strongly into the inner peripheral surface 1a of the concrete hole 1, and the anchor socket 2 can be firmly held on the inner peripheral surface 1a.

Next, when the anchor bolt 3 is rotated in the reverse direction and pulled out from the anchor socket 2, the head 16 separated from the shaft portion 15 remains in the other end portion 6 by the locking force of the locking claw 18. At the same time, even if a strong reaction force in the diameter-reducing direction of the other end portion 6 due to the annular ribs 11 and 12 acts, the anchor socket 2 is reliably prevented from coming out of the anchor socket 2.

Subsequently, as shown in FIG. 7, a predetermined angle member 21 is attached to the anchor bolt 3 and screwed into the anchor socket 2 again, and the angle member 21 is attached to the ceiling wall C or the like via the anchor socket 2. It becomes possible to attach firmly and securely.

As described above, according to the present embodiment, since it is not necessary to apply a hit to expand the distal end portion of the anchor socket as in the conventional case, the wall may be damaged or damaged by the hitting force. Can be prevented, and the generation of an impact sound can also be prevented.

Further, since it can be composed of two parts, the anchor socket 2 and the anchor bolt 3, the number of parts can be reduced, the manufacturing work can be improved, and the cost can be reduced.

Moreover, since the shaft portion 15 of the anchor bolt 3 and the head 16 are separated by the torsion torque during the pushing, the head 16 can be pushed straight without rotating, so that the head 16 can be pushed straight. The sliding frictional resistance between the outer peripheral surface 16b of the head 16 and the inner peripheral surface 6b of the other end 6 becomes sufficiently small. As a result, the tightening operation force of the anchor bolt 3 can be reduced, the mounting work of the anchor socket 2 becomes easy, and the mounting work efficiency can be greatly improved.

Further, the annular ribs 10a to 11 at the other end 6 are provided.
Since the outer diameter of b12 is set to be larger than the inner diameter of the concrete hole 1, and especially the annular rib 12 is set to the maximum diameter, the reaction force of the other end portion 6 in the diameter expanding direction when pushed into the concrete hole 1 becomes large. As a result, a strong and reliable temporary fixing state with respect to the inner peripheral surface 1a of the concrete hole 1 of the anchor socket 2 is obtained. Thereafter, the work of screwing the anchor bolts 3 becomes easier and the safety is improved.

Further, since the plurality of slits 13 of the anchor socket 2 extend almost to the vicinity of the central portion 7, when the anchor bolt 3 is screwed into the anchor socket 2 as described above, the pushing force of the head 16 causes the anchor socket 3 to be pushed. In addition to the other end 6 of FIG.
And the outer peripheral surfaces 6a, 7a and the lower end surface 5b are pressed against the inner peripheral surface 1a of the concrete hole 1 respectively. Therefore, the anchor socket 2 completely buried in the concrete hole 1 has the other end 6, the center 7 and the one end 5 pressed against the inner peripheral surface 1 a of the concrete hole 1, respectively.
Since the point pressure contact state is obtained, the holding force of the anchor socket 2 is further increased.

Therefore, damage to the inner peripheral surface 1a of the concrete hole 1 on the other end 6 side due to the swinging of the anchor socket 2 which is likely to occur in the case of two-point pressure contact between the other end 6 and the one end 5 is surely prevented. It is possible to prevent the anchor socket 2 from being accidentally pulled out due to an increase in the diameter of the hole 1 due to such damage.

Further, since both the outer peripheral surface 6a and the inner peripheral surface 6b of the other end 6 are formed to have a uniform diameter instead of a tapered shape, the manufacturing process of the anchor socket 2 is easier than in the case where the anchor socket 2 is tapered. Therefore, it is possible to improve the efficiency of the manufacturing processing operation, reduce the cost, and obtain high processing accuracy.

FIGS. 11A and 11B show another example of the anchor bolt 3 used in the present invention, in which the locking claw at the tip 16a of the head 16 is omitted. Other configurations such as the cutting groove 20 are the same as those of the previous embodiment.

Accordingly, although the head 16 which has moved straight after the screwing of the anchor bolt 3 is projected from the opening 4b at the other end 6 of the anchor socket 2, it does not engage with the opening edge by the engaging claw, but has a large diameter annular rib. 12, the edge of the hole of the opening 4b bites into the outer peripheral surface 16b due to a large deformation force in the diameter reducing direction, so that a relatively strong locking force is obtained.
Can be prevented from accidentally slipping out.

Moreover, by eliminating the locking claw,
Manufacturing workability is improved, and cost is also advantageous.

The present invention is not limited to the configuration of the above-described embodiment. The cutting groove 20 may be intermittent instead of being annular, and its depth depends on the amount of the anchor bolt 3 advanced. It can be set to a depth that allows cutting at any desired position.
In other words, the depth may be set so that the shaft portion 15 and the head 16 can be cut off halfway when the anchor socket 2 is pushed in while ensuring the integrity of the head portion 16 after the manufacturing process.

The cross-sectional shape of the torsion rib 8 may be not only triangular but also conical or polygonal. In short, the concrete hole 1 and the torso rib 8 are not hindered from being inserted into the building material. Any shape may be used as long as the shape enhances the binding property of.

Further, each of the annular ribs 10a to 11b, 12
May be formed in a spiral shape in the same direction as the torsion rib 8. In this case, the diameter of the annular rib is gradually increased from the central portion 7 of the other end 6 to the tip. .

[0045]

As is apparent from the above description, according to the present invention, the other end of the anchor socket is expanded by the pressing force of the head due to the screwing of the anchor bolt, and the shaft and the head are cut off. As a result, the head is left in the anchor socket, so that it is possible not only to eliminate the necessity of a special tool as in the related art, but also to prevent damage or damage to the building material due to impact, and also to prevent the generation of an impact sound.

Further, as described above, since the opening is not expanded by hitting, it is not necessary to insert the anchor socket and to accurately perform the depth of the fixing hole of the building material. The projection lengths of the anchor sockets or the anchor bolts can be made uniform regardless of the above.

Further, the number of parts can be reduced, the workability of the manufacturing process can be improved, and the cost can be reduced.

Further, since the entire outer diameter of the other end of the anchor socket is formed to have a uniform diameter, the manufacturing process of the anchor socket becomes easier as compared with the case where the anchor socket is formed in a tapered shape. In addition to reducing the cost, high processing accuracy can be obtained.

Further, since the outer diameter of the plurality of ribs provided integrally with the other end portion is gradually increased from the center in the axial direction to the tip end, the rib is strong when pushed into the fixing hole. A strong and reliable holding force can be obtained by the pressing force.

According to the second aspect of the present invention, the head is screwed off from the shaft portion during the screwing of the anchor bolt, so that the head can be pushed straight instead of rotating thereafter. . Thereby, the sliding frictional resistance between the other end of the anchor socket and the head is sufficiently reduced as compared with the case of rotation. As a result, the labor for tightening the anchor bolts can be reduced, the work of mounting the anchor socket can be facilitated, and the efficiency of the mounting work can be improved.

Further, according to the third aspect of the present invention, since a strong pressing force can be obtained at one end, the other end, and the center of the anchor socket with respect to the fixing hole, the holding force of the anchor socket is further increased. Become.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an anchor according to the present invention.

FIG. 2A is a front view of an anchor socket provided in the present embodiment, and FIG. 2B is a longitudinal sectional view of the anchor socket.

FIG. 3 is a front view of the anchor bolt provided in the embodiment.
B is a longitudinal sectional view of the anchor bolt.

FIG. 4 is a diagram illustrating the operation of the present embodiment.

FIG. 5 is an operation explanatory view of the present embodiment.

FIG. 6 is an operation explanatory view of the present embodiment.

FIG. 7 is an operation explanatory view of the present embodiment.

FIG. 8A is a front view showing another example of the anchor bolt, and FIG.
Is a longitudinal sectional view of the anchor bolt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Concrete hole (fixing hole) 2 ... Anchor socket 3 ... Anchor bolt 4 ... Cylindrical main body 4a, 4b ... Opening 5 ... One end part 6 ... Other end part 6a ... Outer peripheral surface 6b ... Inner peripheral surface 7 ... Central part 10a ... 11b ... annular rib 12 ... annular rib 13, 13a ... slit (vertical groove) 15 ... shaft part 16 ... head 18 ... locking claw 19 ... boundary part 20 ... cutting groove

Claims (3)

[Claims] 1. An anchor socket having a tubular anchor opening at both ends, and an anchor bolt screwed into the anchor socket through an opening at one end thereof. And the outer diameter of the entire other end portion is formed uniformly, and the outer diameter of the plurality of substantially annular ribs formed on the outer peripheral surface of the other end portion is determined by the outer diameter of the anchor socket. A head, which is formed to have a gradually larger diameter from the axial center to the distal end, and which integrally expands the other end of the anchor socket through the vertical groove at the distal end of the shaft of the anchor bolt. An anchor fitting characterized by being provided. 2. A relative torque difference between a tightening torque of the anchor bolt and a sliding friction torque of the head against the inner peripheral surface of the other end of the anchor socket at a boundary between the shaft of the anchor bolt and the head. 2. An anchor according to claim 1, wherein a cutting groove for cutting said boundary portion with a predetermined or more torsional torque is formed. 3. An anchor according to claim 1, wherein a vertical groove at the other end of said anchor socket extends to a substantially central portion of said anchor socket.