KR100875776B1 - Structure and Forming Method of Recessed Expansion Fastener - Google Patents

Abstract

The present invention provides a structure and a method of forming a buried expansion fastener. A structure of a buried expansion fastener and a manufacturing method thereof are used to finish a long cylinder by press working. An annular machine thread is pressed into the inner hole of the fastener, an inclined region is formed on the inside, and a joining value different in height and shape is formed on the outside. When attaching screws (bolts) or male members of the appropriate length and dimension, by fastening the screws and pressing them into the annular inclined areas in the inner holes, the fasteners expand outwardly and the engaging teeth are outwardly expanded by expansion of the fasteners. It is developed in the form of an umbrella, and is attached to a wall to realize a fastening effect.

Description

A STRUCTURE OF A FLUSH-MOUNTING EXPANSIBLE FASTENING MEANS AND METHOD FOR FORMING IT}

1 is a three-dimensional view of the expansion fastener of the prior art.

Figure 2 is a three-dimensional view of another type of expansion fastener of the known art.

3 is a three-dimensional view of another type of commercial expansion fastener of the prior art;

Figure 4 is a three-dimensional view of the buried expansion fastener of the present invention.

Figure 5 illustrates the fastening of the buried expansion fastener and the bolt of the present invention.

Figure 6 is a view showing a fastening state of the buried expansion fastener and the bolt of the present invention.

7 is a view showing a fastening state of the buried expansion fastener and the bolt of the present invention.

8 is a view showing a fastening state of the buried expansion fastener and the bolt of the present invention.

9 is a view showing a fastening state of the buried expansion fastener and the bolt of the present invention.

10 is a view showing a molding process of the buried expansion fastener of the present invention.

11 is a view showing a molding process of the buried expansion fastener of the present invention.

12 is a view showing a molding process of the buried expansion fastener of the present invention.

Figure 13 illustrates a molding process of the buried expansion fastener of the present invention.

Figure 14 illustrates a molding process of the buried expansion fastener of the present invention.

15 is a view showing a molding process of the buried expansion fastener of the present invention.

Figure 16 illustrates a molding process of the buried expansion fastener of the present invention.

Figure 17 illustrates a molding process of the buried expansion fastener of the present invention.

[Explanation of symbols on the main parts of the drawings]

10: fastener 12: hole

14: annular thread 16, 17, 18: engagement value

20: stop area 22: inclined area

24: area to be threaded 26: slot

30: hook 40: screw (bolt)

50: wall 51: hole

60: fastening means

61: Ear Shape

62: recess

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a buried expansion fastener and a method for forming the same, in which a machine screw (bolt) or a male member is twisted to securely engage with a wall by the movement of expansion expansion.

Commercially available expansion fasteners and embedded bolts are manufactured by a variety of processing means that combine plastic molding, zinc aluminum alloy diecast molding, cutting, a combination of cold forging and cutting, and cold forging forming and pressing.

However, the processing-related facilities of such related products are complicated, the number of parts, and the material consumption is high. If the expansion fasteners or the buried screws (bolts) do not develop almost as predicted, the buried screws (bolts) generate idle at the expansion fasteners, and the interlocking effect cannot be obtained.

A conventional expansion fastening screw assembly made of the plastic molding shown in Figure 1 is shown. Plastic expansion screw assemblies have the disadvantage of high material cost and long production time, while having low material cost and anti-rust characteristics. In addition, the plastic expansion screw assembly is weak in tensile strength and bearing strength because the plastic material is flexible and the bonding and frictional force to the wall is low. Therefore, the expansion fasteners of the plastic expansion screw assembly are easily released from the wall.

On the other hand, conventional expansion fastener screws by die-cast molding of alloys have a large number of parts, and require high thread cutting, assembly costs, and time. The main drawback is the limitation of the materials used. Machining performance of the product is worse than that of cold rolled wire (plate).

Figure 2 shows a conventional cutting expansion fastener or buried screw (bolt) for expansion bolt assembly, which takes a long time to make the main body, slows down the secondary processing (groove cutting), and material loss. . In particular, the cutting expansion fasteners can only be used with bolts with inclined heads to achieve expansion. As another drawback, cutting expansion fasteners are often made of high-speed steel, and the stiffness is so high that they do not have the expansion-expansion function of the fasteners, which causes the expansion fasteners to generate idle and secure fastening fasteners. Do not have. Therefore, it is not suitable for assembly work or DIY use.

Conventional expansion bolt assemblies, including cold forged metal bolts and cutting metal fasteners, are currently most widely used in civil engineering, restoration, hanging, and fixture fixing. The bolt has an inclined head and the fastener is machined to form a slit therein. This type of expansion bolt also includes a flat washer, an expansion washer, and the construction is of two types. One way is to move the screw (nut) to the bolt rear end, drive the expansion bolt assembly into the predrilled hole in the wall, and tighten the screw. Thus, the bolt with the inclined head of the expansion bolt assembly goes into the slit fastener and expands. The fasteners of this type of expansion bolt assembly fail to expand due to high resistance, and idle occurs when screwed into the bolt. Another way is to move the screw (nut) to the rear end of the bolt, drive the expansion bolt assembly into a predrilled hole in the wall, and release the screw (nut) and expansion washer from the bolt. The bolt with the slanted head then enters the slit fastener and expands to achieve the purpose of securing and expanding the expansion bolt assembly to the wall. However, due to the inconsistency of the depth of the hole during the construction work, the material inside the hole is inclined or flexible, and if the fastener is continuously pounded on one side, it is deeply buried or cannot be used due to the revolving of the bolt. As discussed above, this type of expansion bolt assembly has a high number of related parts, requires skilled skills, and, if inadvertently, cannot achieve construction completeness.

On the other hand, Figure 3 is a further conventional expansion bolt assembly that improves the expansion bolt assembly of the type described above includes an expansion fastener formed mainly by cold rolled bolts and stamps. Forming expansion fasteners by stamping lowers manufacturing costs and lowers resistance to expansion to increase the combined friction between the wall and the fasteners. Stamped expansion fasteners are inflated by forcibly pushing or screwing bolts with inclined heads into the fasteners. This type of expansion fastener assembly still has the drawback that it takes too many parts and requires longer time to assemble these many parts.

The inventor has been engaged in hardware fasteners for a long time; Efforts have been made to overcome the shortcomings in conventional expansion fastener assemblies by developing independent expansion fasteners by stamping using a continuous, simpler, less processing process. Thus, expansion fasteners have internal holes that provide more flexibility to the material from which they are formed, and tightly screw a pair of prefabricated bolts into the fasteners to ensure expansion of the fasteners without risk of slippage, With outgoing teeth protruding outward in a number of different sizes and shapes to ensure tight and frictional contact between the wall and the expansion fasteners without fear of falling out, reducing the number of tools required for the manufacture of the fasteners and greatly reducing costs It offers the advantage of reducing.

Existing expansion fasteners or buried bolts have a large number of parts, require high construction technology, and have low tensile strength and bearing strength. In the present invention, the production process of the product is simple and the production is quick by the integral press molding. In particular, because of the material savings and various selectivity, the number of production processes can be reduced, and the already manufactured screws (bolts) can be easily purchased and installed, the construction achievement rate is 100%, and the construction time can be shortened. Fasteners and construction costs become cheaper.

In order to achieve the object as described above, the present invention drills a hole 51 to the fastener 10 to the wall 50, the machine screw (bolt) 40 or male of the appropriate length and dimensions When the member is screwed into the hole 12 of the fastener 10, when the machine screw 40 is engaged with the thread 14 and enters the front end of the fastener, the inclined fastener 1 rapidly expands and expands to the outside. The joints 16, 17, and 18 having different original heights and shapes are expanded to the outside in the form of an umbrella by expansion and expansion of the fastener 1, and are engaged by engaging with the wall 50. Realize the effect.
By using a molding technology in which press and forging are combined, cold-rolled coils are pressed to form long cylindrical fasteners. An annular thread is installed in the inner hole of the fastener, and the inner side of the fastener is inclined to reduce its size, and forms a coupling value different in height and shape on the outer surface. When attaching screws (bolts) or male members of the appropriate length and dimension, when the screw is screwed in and presses the inclined inclined area to reduce the size of the hole, the fastener expands and expands outward, and the fastening is extended to the fastener. Umbrella form to the outside by development, and the effect of engaging on the wall is realized.

The molding procedure of the continuous press forming technology of the fastener of the present invention will be described in detail as follows.

(1) Prepare raw materials with dimensions required for fasteners and obtain at least two inclined inclined areas on the raw materials.

(2) Press the area where the screw thread is to be molded to form one or more slots in a direction perpendicular to the axis of the material.

(3) Press a hook or one or more engaging teeth into the inclined area of the fastener.

(4) Press the annular thread of the required dimension.

(5) Bend the inclined area of the material at an angle of 1 ° or more.

(6) The area where the threads of the material are to be molded is stamped in a U shape.

(7) The area where the threads of the material are to be formed is rounded up.

(8) Cut off the unnecessary connections that are temporarily connected to complete the fasteners.

The invention of claim 1 is a method of forming a buried expansion fastener by continuous press working,
Preparing a raw material having the dimensions required for the expansion fastener and acquiring at least two inclined inclined areas on the raw material and areas where threads are to be molded on the raw material;
Pressing the material to form one or more slots in an area to be threaded;
Pressing the material to form at least one hook and engagement in each of the inclined regions;
Pressing the material to form a desired thread in the region where the thread is to be shaped;
Pressing the material to bending the inclined area at an angle of 1 ° or more;
Rolling up a region to be molded such that the thread is formed to form a cylindrical portion having a circular cross section;
The method of forming a buried expansion fastener comprising the step of completing one expansion fastener by cutting unnecessary connection that is temporarily connected.

The invention of claim 2 is characterized in that the slots formed in the area in which the threads are to be shaped are perpendicular to the axis of the material.

The invention of claim 3 is a structure of an expansion fastener,
A cylindrical portion defining a threaded hole therein, wherein the cylindrical portion and the hole are inclined toward the front end from near the rear end, the cylindrical portion including one or more engaging teeth protruding outward from the inclined region of the cylindrical portion; The buried expansion fastener structure, characterized in that.

The invention of claim 4 is characterized in that the cylindrical portion is formed by winding a metal plate roundly.

The invention of claim 5 is characterized in that the cylindrical portion of the fastener is provided with a plurality of coupling teeth different in height and shape from each other.

The invention of claim 6 is characterized in that the cylindrical portion of the fastener is provided with at least one stop area.

According to a seventh aspect of the present invention, the cylindrical portion is provided with a fastening means comprising an ear portion protruding to one side near the rear end portion and a recess portion corresponding to the ear portion corresponding thereto. It is characterized by keeping in phase.

Fig. 4 is a three-dimensional view of the buried expansion fastener 10 of the present invention after molding is completed, showing a machine screw (bolt) 40 or a male member having an appropriate length and dimension. 5 is a view showing a state in which the screw (bolt) 40 or the wall is fastened to the inside of the buried expansion fastener 10. As shown in the figure, the fastener 10 rounds a metal plate to form a long cylindrical portion. The fastening means 60 is provided for engaging the two edges rolled up near the rear end of the cylindrical part of the fastener 10. The fastening means 60 includes an ear portion 61 protruding from one of the two edges and a recess portion 62 grooved in accordance with the shape of the ear portion 61 on the corresponding edge side. A hole 12 is provided inside the fastener 10, and an annular thread 14 is provided in the hole 12. In addition, the cylindrical portion and the hole 12 of the fastener 10 is inclined to decrease in size toward the front end, and installs one or more engaging teeth 16 protruding from the outer surface of the fastener. In this figure, a plurality of coupling teeth 16, 17, and 18 having different heights and shapes are provided on the outer surface of the fastener 10, and at least one stop area 20 is disposed outside the cylindrical portion of the fastener 10. In FIG. Install).

With this configuration, an annular threaded portion 14 is provided in the hole 12 of the fastener 10, and coupling teeth 16, 17, 18 having different heights and shapes are provided on the outer surface thereof, Achieve a fastener 10 tapered to reduce the number towards the front end.
6-9 are cross-sectional and partial cross-sectional views illustrating a method of bolting to the hole 51 of the wall 50 through the fastener 10. In addition, the fastener 10 is shown firmly fitted against the inner surface of the hole 51. At the time of construction, drill holes 51 such that the fastener 10 enters the wall 50, and the machine screws (bolts) 40 or male members of appropriate lengths and dimensions are inserted into the holes of the fastener 10 ( 12), when the machine screw 40 is engaged with the thread 14 and enters the front end of the fastener, the inclined fastener 1 expands and expands rapidly and expands to the outside, and at the same time, Coupling teeth 16, 17, and 18 having different shapes are deployed in the form of an umbrella to the outside by expansion and expansion of the fastener 1, and engage with the wall 50 to realize a fastening effect.

The fastener 10 of the present invention uses a stamping using progressive die. The specific molding procedure is shown in Figs. A raw material having dimensions required for the fastener is prepared, and two or more inclined areas 22 inclined on the raw material are obtained (Fig. 10). The region 24 to be threaded is pressed to form one or more slots 26 in a direction perpendicular to the axis of the material (Fig. 11). Next, the hook 30 (barb) or one or more engaging teeth 16, 17, 18 is pressed into the inclined region 22 of the fastener. Engagement teeth 16, 17, 18 have different heights that increase toward the front end of the inclined region. The engagement values 16, 17, 18 are then bent toward the outside of the material (FIG. 12). Subsequently, the region 24 on which the thread is to be shaped is pressed to make an annular thread 14 of the required size (Fig. 13). Finally, the inclined region 22 of the material is pressed and bent at an angle of 1 ° or more (Fig. 14).

After completing the above procedure, the region 24 on which the threads of the material are to be molded is stamped in a U shape (Fig. 14). Subsequently, the region 24 to be formed is wound round the region 24 to be shaped so that the shape of the entire cross section is almost circular (Fig. 16). When the cylindrical portion is formed by completely winding up the region 24 to be threaded, the fastening means 60 having the above-described ear portion 61 and the recess portion 62 is fastened to maintain the wound material in a cylindrical body. (Fig. 17). Finally, the fastener 10 is completed by cutting the connecting part temporarily connecting the material.

As described above, the fastener of the present invention is a widely available material, and is made by combining the well-known stamping technique and the press molding technique in the design of a precise continuous press mold, the fastener 10 of the present invention is as follows. Has an advantage.
The fastening means 60 effectively prevents the rear end of the cylindrical portion of the fastener 10 from expanding or loosening when the screw 40 is screwed into the thread 14 from the rear end of the fastener 10.
The one or more stop zones 20 effectively prevent rotation of the fastener 10 mounted in the hole 51 when the screws (bolts) 40 are screwed inwards (forwards).
Since the hole 12 of the fastener has a thread 14 therein and the cylindrical portion of the fastener and the hole 12 are inclined in all directions, the screw sized to be screwed into the fastener 10 along the thread 14. 40 is expanded to the front of the fastener 10 to form a completely straight cylindrical shape, the engaging teeth 16, 17, 18 are deployed in the form of an umbrella to the outside by the expansion and expansion of the fastener 1, the wall The fasteners are firmly held in place in the holes 51 by tightly engaging in the holes 51 of the 50.

In addition, the fastener 10 is integrally formed by press molding, so that the production process of the product is simple and the production is quick. In particular, because of the material savings and various selectivity, the number of production processes can be reduced, and the already manufactured screws (bolts) 40 can be easily purchased and installed, the construction achievement rate is 100%, and the construction time can be shortened. . Features and effects of the present invention, such as fasteners and construction costs are obvious.

The production process of the fastener of the present invention uses a metal cold rolled coil, combined with precise continuous press forming technology, realizes press molding integrally, the production process is simple, and the production speed is realized.

The fasteners of the present invention have a variety of material selectivities for various applications. Especially widely available metal materials are convenient to use.

The product of the present invention is formed by press molding integrally with a metal cold rolled coil; Compared to various metal expansion fasteners or buried bolts (nuts) manufactured by known techniques such as turning, cold forging, etc., the difference in lightness of materials and manufacturing processes is clear. For example, in the case of a cutting expansion fastener, a round bar is cut, grooved by secondary processing to make an expansion fastening, and cold forged bolts having an inclined head for use with the fastener. In the case of an expansion fastener of cold forging molding, the round bar is formed by cold forging molding to form an inclined head, and then a plurality of parts are combined. The buried bolt is a round bar cut.

Since the product of the present invention is integrally press-molded, the production process, secondary processing, and reduction of the number of parts are obvious as compared with cutting expansion fasteners, cold forging molded expansion fasteners, and cutting-embedded bolts.

The expansion fastener 10 of the present invention is able to use the bolts and screws already made. All bolts and screws with lengths, sizes, and threads consistent with the internal threaded holes 12 of the fastener 10 can be optionally used. Therefore, the fastener 10 of the present invention is superior to the conventional expansion bolt assembly in terms of compatibility.

The fastener 10 of the present invention is very convenient for fixing bolts or screws to the wall. Thus, the fastener 10 is easily driven into the hole 50 pre-drilled in the wall 50 and a bolt or screw 40 suitable for this is selected and screwed into the fastener 10. Ordinary people can also use the fastener 10 and bolts or screws 40 to complete the fixing work in a short time.

Since the hole 12 of the fastener has a thread 14 therein and the cylindrical portion of the fastener and the hole 12 are inclined in all directions, the screw sized to be screwed into the fastener 10 along the thread 14. 40 expands the front part of the fastener 10 to form a completely straight cylindrical shape, and the engaging teeth 16, 17, 18 are deployed in the form of an umbrella to the outside by the expansion and expansion of the fastener 1, and the wall The fastener 10 is firmly held in place in the hole 51 by tightly engaging in the hole 51 of the 50.
Since the fastener 10 of the present invention is in the form of a female member, the bolts or screws 40 of the male member paired with the male member do not protrude from the rear end of the fastener 10 even after the fixing operation is completed. Therefore, it is effective in stability and aesthetics. In addition, after fastening the fastener 10 and the bolt or screw 40 to the wall 50, it is possible to ensure a solid adhesion.

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The present invention relates to a structure of a buried expansion fastener and a molding method, and various materials may be selectively used as the material of the fastener 10 of the present invention, and bolts or screws for use in the fastener 10 ( 40) can be easily selected and used in pre-made products. In addition, the fastener 10 can be efficiently embedded or mounted in the wall without loosening the wall.

Claims (7)

In the method of forming the buried expansion fastener by continuous press working, Preparing a raw material having the dimensions required for the expansion fastener and acquiring at least two inclined inclined areas on the raw material and areas where threads are to be molded on the raw material; Pressing the material to form one or more slots in an area to be threaded; Pressing the material to form at least one hook and engagement in each of the inclined regions; Pressing the material to form a desired thread in the region where the thread is to be shaped; Pressing the material to bending the inclined area at an angle of 1 ° or more; Rolling up a region to be molded such that the thread is formed to form a cylindrical portion having a circular cross section; Forming a buried expansion fastener comprising the step of completing the expansion fastener by cutting the unnecessary connection that is temporarily connected. 2. The method of claim 1, wherein the slots formed in the region to which the threads are to be molded are perpendicular to the axis of the material. delete delete delete delete delete

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