JP2004218421A - Ball pressure type extension anchor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball pressure type extension anchor which is safe and easy to be attached, and does not damage screw threads. <P>SOLUTION: The extension anchor includes a main body, at least one ball and a compression means. At the front end of the main body, a plurality of slits are formed in an axial direction, and a plurality of locking pieces extendible outwardly are also formed. A tapered hole gradually narrowing inwardly is formed in a front part of the inside of the main body. The ball is placed in the tapered hole. The outer diameter of the ball is larger than that of the smallest inner diameter of the tapered hole. A female screw is provided at the rear part of the main body, and a male screw is provided at the outer periphery of the compression means. By making the compression means advance by using a tool, the locking pieces are extended outwardly by the ball so that a fixing effect is achieved. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a type of ball compression type expansion anchor, in which one end of an anchor is forcibly expanded outward by using an internal component to achieve a fixing purpose, and at least one ball is installed inside. The present invention relates to a ball-compressed expansion anchor which has a low resistance, expands smoothly, is easy to operate, and is convenient in use during the expansion process.

  Traditional anchors are divided into external compression type and internal compression type. In use, both of them are hammer type and one end of the anchor is expanded outward to achieve the purpose of fixation. However, because the tapping force was not controlled, the wall was liable to crack, and the anchor surface was buried in the mounting hole of the wall after being hit, so the anchor front end was really fully expanded and planned. It is impossible to judge from the appearance whether the strength is achieved, and there is a potential danger. The use of an internal compression anchor requires that another tool be inserted into the anchor when hitting, which can easily inadvertently damage the threads when hitting, which can render the anchor unusable.

  For this purpose, the present inventor has provided Patent Document 1, which provides a screw thread in the anchor body, screws the pushing means, provides a separate taper hole in the body, and installs the cone therein. By rotating the pushing means to generate radial movement, the cone is moved to expand the front end of the main body outward, and by using a screw fitting between the pushing means and the main body, It is designed to precisely control the actual travel distance of the cone and to ensure that the front end of the body expands outward to achieve a very good fixing effect. However, the contact surface between the pushing means and the inner wall of the main body is large, the contact area between the pushing means and the cone is large, and the magnitude of the frictional force is directly proportional to the applied force and the contact area. Is too large, and it is difficult to turn it, particularly in the later stage of pressing and expanding.

  Further, in Patent Document 2, what is a part in which the pushing means and the cone are divided into two parts in Patent Document 1 is changed to a single cone of the same shape. It is the same and can achieve the same fixed effect. However, there is a disadvantage that the cone and the tapered hole inside the main body have a large friction area during use, and the frictional force is too large in the later stage of the rotational propulsion of the cone, making it difficult to rotate. Furthermore, the anchor is not machined very precisely.In actual production, after forming a plurality of locking pieces that expand outward by slits at the front end of the main body, the concentricity of the outer periphery is not very accurate, and the cone The concentricity of the taper after processing is not sufficiently accurate, so that when the cone is turned in the main body, a slight eccentric phenomenon occurs, making it difficult to turn the cone.

Taiwan Patent Publication No. 345247 Taiwan Patent Publication No. 390394

The main object of the present invention is to provide a ball-compression-type expansion anchor which is easy to operate and convenient to use, and in use, can be controlled so that the anchor front end is in an expanded state accurately, and has a good fixing effect. It should be easy to operate and convenient to use in the process of obtaining and expanding compression, and should solve the drawbacks of conventional hammer operation of anchor.
The ball-compressed expansion anchor of the present invention comprises a body, at least one ball and one push-in means. A plurality of slits in the axial direction are formed at a front end of the main body, a plurality of outwardly expandable locking pieces are formed, and a tapered hole is provided at a front stage inside. The ball is set in the tapered hole. A female screw is provided at a rear portion of the main body, and the pushing means is provided at this portion, and a male screw is provided on an outer periphery of the pushing means and is combined with the female screw. When the pushing means is advanced by using a tool, the ball moves along the tapered hole to forcibly expand the locking piece outward, thereby achieving the expansion fixing effect.

The invention according to claim 1 is characterized in that a plurality of longitudinal slits are opened at a front end to form a plurality of locking pieces that can be extended outward, a tapered hole is provided at an inner front portion, and a female screw is provided at a rear portion. Provided body,
Pushing means installed on a female screw portion in the main body, provided with a male screw on the outer periphery and combined with the female screw,
At least one ball disposed in the main body, between the tapered hole and the pushing means, and having an outer diameter larger than a minimum inner diameter of the tapered hole;
This is a ball compression type expansion anchor characterized by having.
According to a second aspect of the present invention, there is provided the ball compression type expansion anchor according to the first aspect, wherein two balls are provided.
According to a third aspect of the present invention, there is provided a ball compression type expansion anchor according to the first aspect, wherein an outer diameter of the ball is larger than a diameter of a middle tapered hole.
According to a fourth aspect of the present invention, in the ball compression type expansion anchor according to the first aspect, the inner diameter of the tapered hole is such that the dimension of the contact portion with the female screw is maximum and is gradually reduced toward the front end. It is a ball compression type expansion anchor.
According to a fifth aspect of the present invention, there is provided the ball compression type expansion anchor according to the first aspect, wherein the tapered hole linearly contracts toward the front end.
According to a sixth aspect of the present invention, there is provided the ball compression type expansion anchor according to the first aspect, wherein the tapered hole is non-linearly tapered toward the front end.
According to a seventh aspect of the present invention, there is provided the ball compression type expansion anchor according to the first aspect, wherein the outer circumference of the front end of the main body is roughened.
According to an eighth aspect of the present invention, there is provided the ball compression type expansion anchor according to the first aspect, wherein an embossed pattern is formed on an outer periphery of a front end of the main body.
According to a ninth aspect of the present invention, there is provided the ball compression type expansion anchor according to the first aspect, wherein the length of the pushing means is provided to be longer than the length of the main body.
According to a tenth aspect of the present invention, in the ball compression type expansion anchor according to the first aspect, an unpenetrated fitting hole having a shape corresponding to a tool to be used is provided at a rear end of the pushing means. It is a compression type expansion anchor.
According to an eleventh aspect of the present invention, in the ball compression type expansion anchor according to the tenth aspect, the shape of the fitting hole at the rear end of the pushing means is hexagonal, and the tool used is a hexagonal spanner. It is a ball compression type expansion anchor.
According to a twelfth aspect of the present invention, in the ball compression type expansion anchor according to the tenth aspect, the shape of the fitting hole at the rear end of the pushing means is a straight-shaped concave hole, and the tool to be used is a flathead screwdriver. Characterized as a ball compression type expansion anchor.
According to a thirteenth aspect of the present invention, there is provided the ball compression type expansion anchor according to the first aspect, wherein a rear end of the pushing means has a hexagonal shape protruding, and a tool used is a hexagonal sleeve wrench. An expression expansion anchor.
According to a fourteenth aspect of the present invention, there is provided the ball compression type expansion anchor according to the first aspect, wherein the main body is fixed in a metal hole.

The ball compression type expansion anchor of the present invention has the following specific effects.
1. The operation is easy, fast and convenient in the process of expanding and compressing the anchor. The ball is used as a part to expand the locking piece at the front part of the main body, and point or line contact is made between the ball and the pushing means, so that the frictional force generated between the parts in the process of turning the pushing means is small. Therefore, the resistance is minimized, so that the operation can be performed extremely easily and quickly.
2. Processing is easy and there is no need to consider concentricity. A ball is installed inside the anchor, which adjusts the contact position with the inner wall of the body by itself, and even if the center point is not on the center line of the pushing means, the pushing means can be easily turned, and Balls can be purchased easily and are not specially processed, thus reducing production costs.
3. The expansion state of the front end of the anchor can be controlled accurately, and a secure compression fixing effect can be obtained. Using the rotation and movement of the pushing means in the main body, the ball moving distance can be controlled, and the user needs to make the outward expansion state of the front end of the anchor main body, which produces an extremely good fixing effect. it can.
4. Do not hurt the threads. Known internal compression anchors require a tapping operation and are prone to damaging the threads, but operation of the structure of the present invention eliminates this problem.
5. Convenient to use. The anchors of the present invention are implantable, that is, after drilling a mounting hole in the wall, the anchor can be fixed therein and the screw hole can be used for screwing other articles. When installed on the ceiling, well-known anchors had to be hit from bottom to top when fixed, which was inconvenient because of the force.However, the structure of the present invention can be turned with a tool after placing it in the mounting hole. Convenient and fast.
6. Good fixing effect. When two balls are installed in the anchor body, the second ball once again presses the locking piece deformed by the pressing of the first ball at the time of pressing, and further adheres it to the wall to obtain a good fixing effect. Can be
7. Manufacturing costs can be reduced. By providing a ball inside the anchor body, the length of the pushing means can be reduced to make it a general standard screw, eliminating the need for special processing, reducing manufacturing costs and making purchasing easier. Become.
8. Wide application range. If the structure of the present invention is reduced and its strength is increased by heat treatment, it can be placed and fixed in a metal hole and used as a protective sleeve for screws, i.e. The internal thread inside can be used for screwing other articles.

  1, 2, and 3 are a perspective view, an exploded perspective view, and a cross-sectional view of a ball compression type expansion anchor according to the present invention. It comprises a body 1, at least one ball 2, and one pushing means 3. A plurality of slits 11 in the axial direction are provided at the front end of the main body 1 and a plurality of locking pieces 12 that can be extended outward are formed, and a tapered hole 13 (FIG. 3) is formed in a front portion inside the main body 1. It is provided inside the front end of the locking piece 12. A female screw 14 is provided at the rear part of the main body 1, and the diameter of the tapered hole 13 connected to the female screw 14 is gradually reduced toward the front end at the maximum. A male screw 31 is provided on the outer periphery of the pushing means 3 and is screwed with a female screw 14 of the main body 1, and the ball 2 is installed between the tapered hole 13 in the main body 1 and the pushing means 3. The outer diameter of the ball 2 is at least larger than the minimum inner diameter of the tapered hole 13, and the most preferred embodiment is larger than the middle inner diameter of the tapered hole 13. As shown in FIG. 4, in use, the pushing means 3 is turned by using a tool to cause the ball 2 to move in the direction of the taper hole 13, thereby causing the ball 2 to move in the same direction. When the ball 2 moves, the locking piece 12 is compressed to expand outwardly to increase the outer diameter, thereby achieving the effect of expansion and compression and firmly fixed in the hole 41 of the wall 4. Is done.

  The outer periphery of the main body 1 is subjected to a rough surface processing such as embossing, an open annular shallow groove, or a hook shape. The frictional force with the wall of the hole is increased, thereby increasing the fixing effect.

  As shown in FIG. 3, the taper hole 13 in the main body 1 is linearly or non-linearly reduced, and the front position of the taper hole 13 in the present embodiment (that is, near one end in contact with the female screw 14) is Non-linearly shrinks, the cross-sectional shape presents an arc curved surface, the middle position shrinks linearly, the cross-sectional shape presents a slope, the position at the subsequent stage of the tapered hole 13 shrinks non-linearly, and is formed last. The hole diameter is made very small, thereby preventing the ball 2 from falling off from the main body 1 during the expansion process. The shape of the tapered hole 13 can also adopt a non-linear tapering method in all stages. At this time, the cross-sectional shape of the tapered hole 13 is assumed to have a curved surface constituted by different circular arcs. Can be achieved. In other words, the shape of the tapered hole 13 of the present invention is not limited to the shape of the present embodiment, and the curvature can be freely changed according to the necessity of the actual use form.

  As shown in FIG. 2, a fitting hole 32 is provided at the end of the pushing means 3, and its shape is determined by a tool used in combination. In this embodiment, the tool to be used is a hexagonal wrench (or electric wrench), whereby the fitting hole 32 is formed in a hexagonal concave shape. A protruding hexagon is formed at the end (FIG. 5). In other words, the pushing means 3 is formed in a shape in which the ends thereof face each other depending on the tool used.

  FIG. 5 shows a second embodiment of the present invention, in which the pushing means 3a is extended and a local part of the pushing means 3a is extended to the outside. In general, the structure of such anchors is varied on the ground, the equipment is placed directly on it, and a nut is combined with the pushing means 3a to fix the position of the equipment. The anchor shown in FIG. 1 is of the recessed type and is frequently used for ceilings, and in use a bolt is screwed into the body of the anchor and the article is hung on it.

  FIG. 6 is a tensile test report of the anchor of the present invention performed by the Taiwan Institute of Industrial Technology, in which an anchor having an outer diameter of 12 mm was used, of which two specimens (A and C) were rotated by human power and the specimens were rotated. B was strongly tightened with a torque spanner. As can be seen from the test reports, each anchor can withstand a force of at least 1100 kgT and, after withstanding a force of up to 1300 kgT, develops a loosening phenomenon (ie where the curve changes from a diagonal to a curve), The strength and high security of the present invention were illuminated. In addition, it can be rotated manually to achieve the required strength, is easy to operate, has increased functions, and has industrial value.

  FIG. 7 shows a third embodiment of the present invention. The structure of the anchor body 1 is the same as that of the above-described embodiment, and a pushing means and a ball are provided inside. In this embodiment, the terminal hole diameter of the tapered hole 13 at the terminal end of the main body 1 is increased, but is smaller than the outer diameter of the ball. The hole diameter of the wall is substantially equal to the outer diameter of the anchor main body 1, whereby the ball is locked at the middle or middle position slightly behind the tapered hole at the time of expansion compression, so that the expansion effect is good. The advantage of this embodiment is that the manufacturing process of the anchor body 1 is easier.

FIGS. 8 and 9 show a fourth embodiment of the present invention. The greatest difference between this embodiment and the present embodiment is that the number of balls 2 has been changed from one to two. The length of the pushing means 3b is shortened, and one end of the pushing means 3b which comes into contact with the ball 2 is an inwardly concave arcuate surface 33, and the other structure is the same as that of the above-described embodiment. This embodiment has the following advantages.
1. The compression effect is good. When the first ball presses the front portion of the main body 1 to expand and deform the locking piece 12 in use, the rear position of the locking piece 12 is pressed again due to the presence of the second ball, thereby forming a hole in the wall. It closely adheres to the inner wall, reliably increases the contact area and the degree of tension, provides a good compression effect, and further increases the loading force.
2. The length of the pushing means can be shortened to make the screw of the current general standard, no special processing is required, the manufacturing cost of the pushing means can be reduced, and only the main body is specially machined in the whole structure All other balls and pushing means can then use standard parts, which makes production easier.
3. When the pushing means is tightened, even if its position is far away from the locking piece, the external threads on its outer circumference are securely engaged, and the expansion of the locking piece is not affected, and the effect is good.

  FIG. 10 is a test report of the double ball type anchor shown in FIG. 8 by the Taiwan Institute of Technology and compared with other types of anchor. In the report, A is the ball compression anchor of the present invention, B is the outer compression anchor, and C is the inner compression anchor. As can be seen from this report, the tensile strength of the anchor of the present invention reaches about 1310 KGS. However, the other known types of anchors are only 939 KGS and 1132 KGS, respectively, and are clearly lower than the anchors of the present invention, thus indicating that the expansion compression effect of the present invention is better.

  Further, the structure of the present invention can be used for fixing between metals. For example, it can be fixed by further heat treating the body to increase its strength, putting it in a pre-drilled hole at the time of use, and further turning the pushing means to expand the front end of the body outward, as well as female screws in the body. Other objects can be screwed in to screw the two metal objects together. Thus, the application range of the structure of the present invention is very wide and is not limited to use on walls.

  The foregoing does not limit the scope of the present invention, and any modification or alteration of details that can be made based on the present invention shall fall within the scope of the present invention.

It is a perspective view of the present invention. It is an exploded perspective view of the present invention. It is sectional drawing of this invention. It is sectional drawing which used this invention for the wall actually. FIG. 6 is a perspective view of a second embodiment of the present invention. It is a tensile test report of the Industrial Technology Research Institute of the anchor of the present invention. FIG. 11 is a perspective view of a third embodiment of the present invention. FIG. 11 is a perspective view of a fourth embodiment of the present invention. FIG. 9 is a sectional view of a fourth embodiment of the present invention. 8 is a tensile test report from the Institute of Industrial Technology of the anchor of the embodiment of FIG. 8 of the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Main body 11 Slit 12 Locking piece 13 Taper hole 14 Female screw 15 Emboss processing 2 Ball 3 Pushing means 31 Male screw 32 Fitting hole 4 Wall 41 Hole 3a Pushing means 3b Pushing means 33 Arc surface

Claims (14)

A plurality of locking pieces that are opened at the front end are formed with a plurality of vertical slits and are expandable outward, a tapered hole is provided at the front part inside, and a main body provided with a female screw at the rear part,
Pushing means installed on a female screw portion in the main body, provided with a male screw on the outer periphery and combined with the female screw,
At least one ball disposed in the main body, between the tapered hole and the pushing means, and having an outer diameter larger than a minimum inner diameter of the tapered hole;
A ball compression type expansion anchor characterized by comprising:   The ball compression type expansion anchor according to claim 1, wherein two balls are provided.   The ball compression type expansion anchor according to claim 1, wherein the outer diameter of the ball is larger than the diameter of the middle step of the tapered hole.   The ball compression type expansion anchor according to claim 1, wherein the inner diameter of the tapered hole has a maximum dimension of a portion in contact with the female screw and is gradually reduced toward a front end.   The ball compression type expansion anchor according to claim 1, wherein the tapered hole linearly contracts toward the front end.   The ball compression type expansion anchor according to claim 1, wherein the tapered hole is non-linearly tapered toward the front end.   The ball compression type expansion anchor according to claim 1, wherein a roughened surface is applied to an outer periphery of a front end of the main body.   The ball compression type expansion anchor according to claim 1, wherein an embossed pattern is formed on an outer periphery of a front end of the main body.   The ball compression type expansion anchor according to claim 1, wherein the length of the pushing means is longer than the length of the main body.   2. The ball compression type expansion anchor according to claim 1, wherein an unpenetrated fitting hole having a shape corresponding to a tool to be used is provided at a rear end of the pushing means.   The ball compression type expansion anchor according to claim 10, wherein the fitting hole at the rear end of the pushing means has a hexagonal shape, and a tool to be used is a hexagonal wrench.   11. The ball compression type expansion anchor according to claim 10, wherein the shape of the fitting hole at the rear end of the pushing means is a straight hole, and the tool used is a flathead screwdriver. Extension anchor.   The ball compression type expansion anchor according to claim 1, wherein a rear end of the pushing means has a hexagonal shape and a tool to be used is a hexagonal sleeve wrench. The ball compression type expansion anchor according to claim 1, wherein the main body is fixed in the metal hole.

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