KR20180110938A - Tapping screw to improve force for contracting and preventing loosening - Google Patents

Abstract

A tapping screw having improved fastening force and anti-releasing force according to the present invention includes: a head portion; and a body portion extending from the head portion and formed on an outer peripheral surface thereof with at least one thread. The thread is formed with a transition portion, in which the transition portion is formed at a region where the thread makes contact with the body portion and has a thread angle less than a thread angle of the thread. The transition portion may be formed on any one of a flank surface of the thread located in front of the body portion in the fastening direction of the body portion, or a flank surface of the thread located rearward. Unlike the conventional tapping screw, which is used by varying the shape and number of threads depending on the material and fastening depth of the object to be fastened, the tapping screw with improved fastening force and anti-releasing force according to the embodiment of the present invention can improve the fastening force and anti-releasing force by the transition portion located at a position adjacent to the thread. Thus, it can be commonly used regardless of the material and the fastening depth of the object to be fastened so that deformation of the object to be fastened can be minimized and it can be repeatedly used.

Description

TECHNICAL FIELD [0001] The present invention relates to a tapping screw having improved fastening force and anti-loosening force,

The present invention relates to a tapping screw, and more particularly, to a tapping screw having improved fastening force and anti-loosening force that can be used regardless of the material of an object to be fastened such as an injection molded article, a soft metal, or a hard metal material.

In general, a screw or a screw (hereinafter referred to as a screw) is a component used when a plurality of parts are combined, including mechanical parts and electronic equipment, and usually has a strong fastening force and a loosening preventing force. Such a screw is easy to construct, and its fastening force can be adjusted according to the object (or base material) to be fastened and it is easy to disassemble.

The screw is divided into a triangular screw, a square screw, a trapezoidal screw, a toothed screw, a round screw and a ball screw depending on the cross-sectional shape of the screw thread formed on the outer circumferential surface. And flat head screws.

Depending on the shape of the screw, it is divided into a small screw, a stop screw, a tapping screw, a helical insert, and the like.

Here, the tapping-screw is a screw that can cut the object to be fastened by the screw itself. Such a tapping screw is classified into a pot tapping screw, a plate tapping screw, a round plate tapping screw, a hexapascal tapping screw and the like depending on the shape of the head. The tapping screw is classified into an injection material such as a synthetic resin, a hard material such as aluminum, The type of screw used varies depending on the material and type of the object to be fastened (base material).

For example, when fastening a fastening object having a loose material such as a synthetic resin or an injection molding material to a fastening object, the fastening object (base material) or the cone A tapping screw of the type can be used.

This is because when the tapping screw is fastened to the object to be fastened, the interval between the threads is widened, so that the fastening interval of the thread is widened, the deformation of the fastening object is minimized, and the screw can be used repeatedly. However, the above-mentioned conical tapping screw has a problem in that it is difficult to apply to a fastening object and a structure having an extremely short fastening depth because the spacing of threads is wide.

On the other hand, when fastening to a fastening object made of a soft hard metal material having a stronger material than synthetic resin, the tapping screw is processed to the same level as the fastening object. At this time, by narrowing the spacing of the threads of the tapping screw and increasing the number of threads, the torque value is reduced by the screw, so that the screw can be prevented from being released by external impact such as vibration. However, as described above, the tapping screw having a narrow spacing of threads and an increased number of threads has a problem in that the tapping screw can be limitedly used for ultra-precision electronic products having an ultra-thin structure and a short fastening depth.

Accordingly, the applicant of the present invention has proposed the present invention in order to solve the above-mentioned problems, and as related art documents related thereto, Korean Patent Laid-Open Publication No. 10-2001-0006619 (titled as first thread and second Fastener with thread, open date: Jan. 26, 2001).

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tapping screw having a fastening force and an anti-loosening force which can be commonly used regardless of the material of the fastening object to which the tapping screw is fastened.

In addition, the present invention provides a tapping screw improved in fastening force and anti-loosening force which can be used for soft metal such as synthetic resin, injection molding, aluminum, etc., and a thin fastening object.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

The above object is achieved according to the present invention, And a body portion extending from the head portion and having at least one thread on an outer circumferential surface thereof; Wherein the transition portion has a transition portion formed at a portion where the thread and the body portion meet and has a thread angle that is gentler than the thread angle of the thread, And a tacking screw formed on one of the flank surfaces of the thread and the flank surface of the thread located on the rear side of the threaded portion.

The thread has a first flank surface located in front of a fastening direction of the body portion; And a second flank surface formed opposite to the first flank surface and positioned behind the fastening direction of the body portion; And the transition portion may be formed on the first flank surface or the second flank surface.

The transition portion includes a first fringe surface that is in contact with the first flank surface or the second flank surface; And a second front surface which is opposite to the first front surface and whose lower end is in contact with the body portion, wherein the first front surface and the second front surface are formed by the first flank surface or the second surface It can be formed to have a slope that is gentler than the flank surface.

The length of the first front surface may be shorter than the length of the second front surface, and the inclination of the first front surface may be formed more gently than the inclination of the second front surface.

The gap between the second front surface and the first flank surface or the second flank surface may gradually increase from the upper side to the lower side of the transition portion.

A transition thread is formed at a point where the first front surface and the first flank surface or the second flank surface meet with each other and an additional pressure applied to the thread by the fastening object may be generated by the transition thread.

The height from the body portion to the transition portion may be smaller than the height from the body portion to the thread portion.

The plurality of threads may be formed to have the same height as each other, and the plurality of transition portions may be formed to have the same height as each other.

A transition thread is formed between the first flank surface and the top of the transition portion or between the second flank surface and the top portion of the transition portion, and when the tapping screw of the tapping screw is tightened, the first flank surface or the second flank surface An additional pressure applied to the thread by the fastening object may be generated by interference between the moving object and the transition thread.

The tapping screw having improved fastening force and loosening preventing force according to the present invention is different from the conventional tapping screw in that the shape and number of the threads are different according to the material and fastening depth of the fastening object, And the anti-loosening force can be improved, so that it can be commonly used irrespective of the material of the fastening object and the fastening depth. Thus, the fastening can be repeatedly used by minimizing the deformation of the fastening object.

In addition, the tapping screw of the present invention having an improved fastening force and an anti-loosening force can reduce the defect rate that may occur in the rolling process of forming the thread due to the formation of the transition portion.

FIG. 1 is a perspective view of a tapping screw according to an embodiment of the present invention with improved fastening force and anti-loosening force.
2 is a cross-sectional view of the tapping screw with improved fastening and unfastening forces shown in Fig.
FIGS. 3 and 4 are enlarged views of the threads of the tapping screw with improved fastening force and anti-loosening force shown in FIG. 2. FIG.
5 is a view for explaining a transition portion of the tapping screw according to FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures are shown exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive. And to the same structure, element or component appearing in more than one drawing, the same reference numerals are used to denote similar features.

The embodiments of the present invention specifically illustrate ideal embodiments of the present invention. As a result, various variations of the drawings are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, referring to the accompanying drawings, a tapping screw 100 (hereinafter referred to as 'tapping screw') having improved fastening force and unwinding preventing force according to an embodiment of the present invention will be described.

FIG. 1 is a perspective view of a tapping screw according to an embodiment of the present invention, FIG. 2 is a sectional view of the tapping screw shown in FIG. 1, and FIGS. 3 and 4 are enlarged views of threads of the tapping screw shown in FIG. 5 is a view for explaining a transition portion of the tapping screw according to FIG.

1 and 2, a tapping screw 100 according to an embodiment of the present invention includes a head 110 and a head 110. The tapping screw 100 includes at least one thread 130 (Not shown).

1 to 4, the head 110 is connected to the body 120 or formed at one end in the longitudinal direction of the body 120, and at one end of the head 110, 120 may be connected and a fastening portion (not shown) may be formed at the other end. Here, the fastening part (not shown) is a part where a tool or the like for fastening the tapping screw 100 to the fastening object 101 can be fitted, and may be provided in the form of a groove or a groove into which a tool can be inserted .

When the body part 120 is inserted into the fastening object 101 by a tool inserted into a fastening part (not shown) formed at the other end of the head part 110, one end of the head part 110 is fastened to the fastening object 101). For reference, the head 110 is shown in the form of a cylinder in the figure, but the present invention is not limited thereto. The head 110 may be formed in various shapes such as a circle, a square, and a hexagon.

One end of the body part 120 may be connected to the head part 110. The body portion 120 may have a diameter smaller than the size of the head portion 110 or a length in the radial direction, and may be formed in a cylindrical shape elongated along the fastening direction. At this time, a plurality of threads 130 may be provided on the outer circumferential surface of the body portion 120 formed in a cylindrical shape.

The other end of the body portion 120 facing the head 110 may be formed in a conical shape so as to be inserted into the fastening object 101. [

2, the body portion 120 having the plurality of threads 130 on the outer circumferential surface thereof may be formed in a direction F in which the tapping screw 100 is fastened to the fastening object 101, And may be divided into an introduction part 122, a fastening part 124 and a completion part 126 or may include an introduction part 122, a fastening part 124 and a completion part 126. [

Specifically, the introduction part 122 of the body part 120 is a part where the body part 120 starts to enter the fastening object 101, and the part where the thread 130 and the fastening object 101 are screw- And a female thread corresponding to a plurality of threads 130 formed on the outer circumferential surface of the body 120 may be formed in the fastening object 101. [

The fastening part 124 of the body part 120 may be a part fastened to the female thread formed inside the fastening object 101 by the introduction part 122. That is, the fastening part 124 is a part where the thread 130 is fastened to the fastening object 101 following the introduction part 122 after the body part 120 enters the fastening object 101 by the introduction part 122 .

The completion part 126 of the body part 120 is a part that is finally inserted into the fastening object 101 to complete the fastening of the body part 120 and the fastening object 101, After the fastening portion 124 is inserted and positioned, it can be finally inserted and positioned. That is, when the introduction part 122, the fastening part 124 and the completion part 126 of the body part 120 are inserted and positioned inside the fastening object 101, the head part 120 connected to one end of the body part 120, One end of the fastening member 110 may be in contact with the fastening object 101.

3 and 4, the plurality of threads 130 provided on the body 120 include a first flank surface 132, a second flank surface 132 formed symmetrically with the first flank surface 132, (Not shown). When the body part 120 enters the fastening object 101, the flank surfaces positioned in front of the fastening direction F with respect to the same thread are defined as the first flank surface 132, the flank surfaces May be defined as a second flank surface 134.

The first flank 132 and the second flank 134 of the thread 130 are provided in a generally triangular shape and are located at the intersection of the first flank 132 and the second flank 134 of the thread 130 The top portion 131 can be formed. Here, as the inclination of the first flank surface 132 and the second flank surface 134 is formed identically, the thread 130 including the first flank surface 132 and the second flank surface 134 is symmetrical May be provided with threads. However, the inclination of the first flank surface 132 and the second flank surface 134 may be formed differently depending on the required fastening force or unwinding preventing force, or the shape of the thread may be asymmetric with respect to the vertical line.

Furthermore, the height H of the tops 131 of the plurality of threads 130 may all be the same. Accordingly, the thread angle? Formed by the first flank surface 132 and the second flank surface 134, that is, the thread angle between the first flank surface 132 and the second flank surface 134, May be formed identically with respect to the threaded portion 130.

Here, in order to form a plurality of threads 130 on the body 120 of the present invention, a rolling process is performed. At this time, there is a risk that the plurality of threads 130 are damaged in the rolling process. In the case of the present invention, it is possible to prevent the breakage of the thread 130 generated in the rolling process or the failure of the thread 130 by the transition part 140 formed in the thread 130.

1 to 4, the transition portion 140 may be formed at a portion where the threaded portion 130 formed on the body portion 120 meets the body portion 120, and the transition portion 140 may be formed on one surface of the plurality of threads 130 Respectively. The transition portion 140 may be formed on either the flank surface of the thread 130 located in front of the fastening direction F of the body portion 120 or the flank surface of the thread 130 located behind the body portion 120. [ In other words, the transition portion 140 may be provided on either the first flank surface 132 or the second flank surface 134 of the thread 130.

Although the transition portion 140 is preferably formed on the second flank surface 134 of the thread 130, the transition 130 may be threaded 130 according to the detailed requirements, design specifications, or selected specific design requirements of the tapping screw 100 The transition portion 140 may be formed on the first flank surface 132. [ For example, when the shape of the thread 130 is asymmetrical with respect to the thread angle of the first flank face 132 to the thread angle of the second flank face 134, the transition 140 may be formed by the first flank face 132 As shown in FIG.

Hereinafter, for convenience of explanation, the transition unit 140 will be described as an example of the tapping screw 100 formed on the second flank surface 134, but it is not limited thereto.

3 and 4, the transition portion 140 may be formed on the second flank surface 134, and the lower end of the transition portion 140 may be formed to abut the outer surface of the body portion 120. The lower end of the transition portion 140 may be formed to abut the outer surface of the body portion 120 even when the transition portion 140 is formed on the first flank surface 132. [

Since the thread 130 according to the embodiment of the present invention has the same inclination of the first flank face 132 and the second flank face 134, A stress σ is generated for fastening between the first flank surface 132 and the second flank surface 134. The stress σ generated from the first flank surface 132 toward the fastening object 101 The tapped screw 100 and the fastening object 101 can be fastened to each other by the stress generated from the first flank surface 134 and the second flank surface 134 toward the fastening object 101.

In addition, since the transition portion 140 is provided on the first flank surface 132 or the second flank surface 134 of the plurality of threads 130, the second flank surface 134 of the thread 130 and the second flank surface 134 of the threads 130, Stress is concentrated between the first flank surfaces 132 of the facing other threads 130 so that the unwinding of the tapping screw 100 can be more effectively prevented.

In other words, when fastening the tapping screw 100 to the fastening object 101 made of a synthetic resin or a soft metal, the fastening object 101 cut by the thread 130 of the tapping screw 100 is a chip, The flow of the chip-like fastening object 101 flowing at this time and the transition portion 140 cause mutual interference, and thus additional stress is generated.

As described below, a transition thread 145 is formed at the transition portion 140 of the tapping screw 100 according to an embodiment of the present invention. Can be maximized.

The lower surface of one side of the transition portion 140 formed on the first flank surface 132 or the second flank surface 134 is formed to abut against the body portion 120 so that the thickness and size of the root 130 of the thread 130 It is possible to expect an effect of preventing the thread 130 from being damaged in the rolling process.

3 and 4, the transition portion 140 may include a first front surface 142 that is in contact with the first flank surface 132 or the second flank surface 134 of the thread 130, And a second front surface 144 opposed to the first front surface 142 and contacting the body 120. In addition, the transition top 141 can be formed by the intersection of the first front surface 142 and the second front surface 144.

Here, the length of the first front surface 142 may be shorter than the length of the second front surface 144. Furthermore, the inclination of the first front surface 142 may be formed to be gentler than the inclination of the second front surface 144. Accordingly, the width between the first front surface 142 and the second front surface 144 may be gradually increased from the upper side of the transition portion 140 to the lower side. That is, the second front surface 144 is not formed in parallel with the first flank surface 132 or the second flank surface 134, but rather extends from the transition top portion 141 toward the body portion 120, It is preferable that the gap between the second flank surface 132 and the second flank surface 134 and the second front surface 144 is increased.

The first front surface 142 is formed to be inclined downward from the transition top portion 141 toward the first flank surface 132 or the second flank surface 134 and the second front surface 144 is formed from the transition top portion 141 And may be formed to be inclined downward toward the outer surface of the body 120.

The first front surface 142 and the second front surface 144 of the transition portion 140 have a gentle slope than the first flank surface 132 and the second flank surface 134 of the thread 130 . In other words, the first flank surface 132 and the second flank surface 134 are formed at the same inclination, and the second front surface 144 is made gentler than the first flank surface 132 and the second flank surface 134 And the first front surface 142 may be formed to have a slope that is gentler than the slope of the first front surface 142. The thread angle between the first flank 142 and the second flank 144 of the transition 140 is greater than the thread angle between the first flank 132 and the second flank 134 of the thread 130, As shown in FIG.

As described above, by forming the transition portion 140 on the first flank surface 132 or the second flank surface 134 of the thread 130, the tapping screw 100 The fastening force and the loosening preventing force can be improved.

4, the point where the first front surface 142 of the transition portion 140 meets the first flank surface 132 or the second flank surface 134, that is, the transition thread 145, (P) may be generated. A pressure is generated in which the fastening object 101 presses the first and second flank surfaces 132 and 134 of the thread 130 with the tapping screw 100 fastened to the fastening object 101, The anti-loosening force of the tapping screw 100 can be generated.

In the case of the present invention, the transition part 140 is formed at the lower end of the first flank surface 132 or the second flank surface 134, A reaction force against the force exerted by the first flank 132 or the second flank 134 by the fastening object 101 may be generated by the transition thread 145 formed by the second flank 134 or the second flank 134. [ , An additional reaction force or an additional pressure (P) for this reaction force may be generated. As a result, the unwinding force with the object to be fastened 101 can be improved by the additional pressure P generated by the transition thread 145.

The transition thread 145 formed between the transition top 141 and the first flank surface 132 or the second flank surface 134 is formed by the tapped fastening member 1 flank surface 132 of the screw 100, An additional pressure P applied to the thread 130 by the fastening object 101 through interference between the fastening object 101 and the transition thread 145 flowing on the surface 134 may occur.

As described above, the tapping screw 100 according to the embodiment of the present invention includes the transition thread 140 having the first flank 142 and the first flank 132 or the second flank 134, The tightening force and the anti-loosening force of the tapping screw 100 against the fastening object 101 can be improved due to the additional pressure P generated in the fastening member 145.

In addition, the depth of the transition thread 145 allows the transition thread 145 to have a predetermined angle of inclination with respect to the second flank 134, which, when fastened by the tapping screw 100, The incised fastening object 101 flowing between the opposed threads 130 is pulled toward the second flank surface 134. As a result, an effect that the surface of the object to be fastened 101, which abuts the second flank surface 134, and the second flank surface 134 are more closely adhered to each other can be obtained. 5A) of the transition portion 140, the bottom thickness (see FIG. 5B) of the transition portion 140, the upper thickness (see FIG. 5C) of the transition portion 140, Can be further increased by adjusting or changing various design elements constituting the transition portion 140 such as the depth of the transition threaded portion 145 (see FIG. 5D) and by increasing the inclination angle of the transition threaded portion 145.

In addition, since the inclination of the second front surface 144 is formed to be gentler than the inclination of the first flank surface 132 or the second flank surface 134, it is possible to reduce the thickness of the light emitting material such as synthetic resin, It is possible to prevent deterioration of the fastening force or the loosening preventing force regardless of various materials such as steel material and the fastening depth.

The height h of all the transition portions 140 formed on the first flank surface 132 or the second flank surface 134 of the thread 130 or the transition top portion 141 from the outer surface of the body portion 120, May all be formed at the same height.

Referring to FIG. 3, the height h of the transition portion 140 may be lower than the height H of the thread 130 described above. For example, if the height H of the thread 130 is 1 cm, the height h of the transition portion 140 may be 0.5 mm or less. That is, the height h of the transition portion 140 is preferably less than half of the height H of the thread 130.

According to the present invention, the tapping screw 100 having improved fastening force and anti-loosening force according to the present invention is different from the conventional tapping screw in that the shape and number of the threads are different according to the material and fastening depth of the fastening object, Since the fastening force and the loosening preventing force can be improved by the transition part formed at the position, it can be commonly used regardless of the material and the fastening depth of the fastening object. Accordingly, by minimizing the deformation of the fastening object during fastening, have.

In addition, the tapping screw 100 having improved fastening force and anti-loosening force of the present invention can reduce the defect rate that may occur in the rolling process of forming the thread due to the formation of the transition portion.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

100: Tapping screw
110: Head
120:
130: thread
131: Top
132: first flank face
134: second flank face
140: Transition
141: transition top
142:
144:
145: Transitional thread

Claims (9)

Head; And
A body extending from the head and having at least one thread formed on an outer circumferential surface thereof; Lt; / RTI >
Wherein a transition portion having a thread angle that is less than a thread angle of the thread is formed in the thread at a portion where the thread meets the body portion,
Wherein the transition portion is formed on any one of a flank surface of the thread located in front of the body in the fastening direction of the body or a flank surface of the thread located in the rear of the thread.
The method according to claim 1,
The thread,
A first flank surface positioned in front of a fastening direction of the body portion; And
A second flank surface formed opposite to the first flank surface and located behind the body-fastening direction; / RTI >
Wherein the transition portion is formed on the first flank surface or the second flank surface, wherein the fastening force and the loosening preventing force are improved.
3. The method of claim 2,
The transition portion includes:
A first front surface in contact with the first flank surface or the second flank surface; And
And a second front surface opposite to the first front surface and having a lower end in contact with the body,
Wherein the first front surface and the second front surface are formed so as to have a gentle slope than the first flank surface or the second flank surface.
The method of claim 3,
Wherein a length of the first front surface is shorter than a length of the second front surface and a slope of the first front surface is formed to be gentler than a slope of the second front surface. Improved tapping screw.
The method of claim 3,
Wherein the gap between the second front surface and the first flank surface or the second flank surface is gradually increased from the upper side to the lower side of the transition portion, wherein the fastening force and the loosening preventing force are improved.
6. The method of claim 5,
A transition thread is formed at a point where the first front surface and the first flank surface or the second flank surface meet with each other,
And an additional pressure applied to the thread by the fastening object is generated by the transition thread.
The method according to claim 6,
Wherein the height from the body portion to the transition portion is smaller than the height from the body portion to the thread portion.
The method according to claim 6,
Wherein the plurality of threads are formed at the same height,
Wherein the plurality of transition portions are formed to have the same height as each other, and are provided at a height smaller than the thread, wherein the fastening force and the loosening preventing force are improved.
6. The method of claim 5,
A transition thread is formed between the first flank surface and the top of the transition portion or between the second flank surface and the top portion of the transition portion,
And an additional pressure applied to the thread by the interference object is generated by the interference between the thread of the fastening object flowing on the first flank surface or the second flank surface during tapping of the tapping screw and the transition thread. Tapping screw with improved clamping force and anti-loosening force.

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