KR20090006288A

KR20090006288A - Screw

Info

Publication number: KR20090006288A
Application number: KR1020070069475A
Authority: KR
Inventors: 박흥범
Original assignee: 주식회사 서울금속
Priority date: 2007-07-11
Filing date: 2007-07-11
Publication date: 2009-01-15

Abstract

A screw is provided to maintain strong fastening force by forming a female thread on a fastening member of an object with less torque when driven to the object. A screw comprises a head(10) in which a screw driver is inserted, a fastening part(20) extended from one side of the head and in which a screw thread(22) is formed in order to be inserted into a fastening member of an object, and a screw forming part(30) in which a screw thread(32,34) is formed continuously from the screw thread of the fastening part, where the angle of the screw thread is smaller than that of the fastening part in order to form a female thread on the fastening member of the object.

Description

Screw {SCREW}

The present invention relates to a screw, and more particularly, a screw thread having an angle smaller than the angle of the thread formed in the fastening portion at one end portion of the screw is formed, and at the same time, the female screw is firmly formed at the fastening member with little torque. It relates to a screw that can be fastened.

In general, when combining a plurality of parts, including mechanical parts or electronic devices, while having a strong fixing force, and easy to install, the fastening force can be adjusted according to the fastening object and at the same time using a screw that is easy to dismantle.

According to the shape of the head, such screws are variously classified into a tannery screw, a hexagonal head screw, a square head screw, a countersunk head screw, a round head screw, a flat head screw, and the like. It is divided into screw, toothed screw, round screw, square screw, trapezoidal screw, etc.In the center of tannery screw, countersunk screw, round head screw and flat head screw except hexagon head screw and square head screw, flat head, Phillips screwdriver or hex wrench Grooves such as dates or crosses are formed to provide a contact space with the fastening tool.

As an example, the conventional screw 100 is formed of a fastening part 120 having a thread extending from the head part 110 and the head part 110 and continuously formed on the outer circumferential surface, and the thread formed on the fastening part 120 ( 122 is formed at an angle of 60 degrees.

In the conventional screw configured as described above, in order to fasten the screw to the fastening member, a tapping process for forming a female screw is required to facilitate fastening of the screw to the fastening member at the position where the screw is to be fastened as a procedure to be fastened. After processing, a process of removing chips generated during tapping processing was required, and a line processing process such as an inspection process to determine whether the female thread was formed correctly by tapping processing was necessary.

In addition, as shown in Figure 5 in the case of the screw 100 formed so that the outer diameter of the screw 122 is smaller toward one end of the screw 100, by processing only holes without the need to form a female screw on the fixed member The thread 122 of the screw 100 is fastened to form an internal thread on the inner circumferential surface of the hole. However, since all of the threads 122 formed on the outer circumferential surface of the conventional screw 100 form an angle of 60 °, a lot of force is required to form and fasten the female screw on the inner circumferential surface of the hole.

In addition, there is a problem that the loosening phenomenon due to vibration or the like also occurs after screw fastening.

The present invention is to solve the conventional problems as described above, the problem to be solved by the present invention is to provide a means that can be securely fastened to form a female screw with a small torque to the fastening member when screwing. .

Another problem to be solved by the present invention is to provide a means capable of maintaining a firm fastening force by suppressing the easy release even under the action of the release torque.

The problem solving means for solving the problem to be solved as described above,

Head portion made so that the fastening tool can be inserted to one side;

A fastening part extending from the head to one side and having a screw thread formed to be inserted and fixed to the fixed member;

A thread-forming part which is formed continuously to the thread of the fastening part and has a thread of an angle smaller than the thread angle of the fastening part so that a female thread is formed in the fixed member;

It is achieved by providing a screw comprising a.

As described above, the screw according to the present invention

By forming a thread with an angle smaller than the angle of the thread formed in the fastening part in one end area of the screw, it is fastened by forming a female thread on the member to be fastened with a small torque when tightening, so that a separate tapping process is unnecessary. Is in contact with strong friction, which provides the effect of preventing loosening due to external force after screwing.

The present invention has been described above by the embodiments, but the present invention is not limited to the above-described embodiments, and those skilled in the art without departing from the gist of the present invention claimed in the claims. Anyone can make a variety of variations.

Hereinafter, with reference to the accompanying drawings for the screw according to a preferred embodiment of the present invention will be described in detail.

1 is a front view of a screw according to a preferred embodiment of the present invention, Figure 2 is a partially enlarged cross-sectional view for explaining the screw forming portion of the screw shown in Figure 1, Figure 3 is shown in Figure 1 4 is a cross-sectional view showing a state in which a threaded portion of the screw is inserted, and FIG. 4 is a cross-sectional view showing a state in which the screw shown in FIG. 1 is fastened to a fixed member.

As shown in Figure 1 and 2, the screw 1 according to a preferred embodiment of the present invention consists of a head 10, a fastening portion 20 and a threaded portion 30.

In the center of the upper surface of the head 10, a fastening groove 12 recessed inward for fastening the fastening tool is formed. The fastening groove 12 is formed in a straight or cross shape and rotates by the rotation of a fastening tool such as a straight or Phillips screwdriver.

The fastening part 20 is a part to be fastened to the fixed member 40 and extends from one side of the head part 10, and the thread 22 is continuously formed on the outer circumferential surface thereof. This thread 22 is formed to form a 60 ° angle.

The thread forming portion 30 forms a female screw 44 on the member 40 to be fastened when the screw 1 is fastened, and a molding screw thread for forming the female screw 44 on the member 40 to be fixed on the outer circumferential surface thereof. 32,34) are formed continuously. The molding screw 32 is formed such that the outer diameter of the screw thread becomes smaller toward one end region. The molding screw 32 is formed at an angle of 60 °, and is formed to have an angle of 35 ° at its vertex area, and the cross-sectional area (a) of the thread that forms the 60 ° angle is formed such that its cross-sectional area decreases toward one end side. . In other words, the cross-sectional area (b) of the screw thread having an angle of 35 ° is formed so that the cross-sectional area thereof becomes wider toward one end side of the thread-forming part 30. In addition, the molding screw thread 34 formed at the end of one end of the molding screw thread 32 is formed at an angle of 35 degrees. Molding threads 32 and 34 are formed to form 3 to 6 pitches at one end.

On the other hand, in the present embodiment has been described as an example of a round head screw as a shape of the head portion 10 constituting the present invention, the present invention is not limited to this, including the plate head, flat head, including hexagon or square head according to the specification It may be formed in a variety of shapes, including the head and the tannery, the diameter and length of the fastening portion 20 is also formed in various diameters and lengths depending on the object to be applied.

In addition, the present invention can be applied to the left screw as well as the right screw.

The operation and effects of the present invention having the above configuration will be described below with reference to FIGS. 3 and 4.

As shown in FIG. 3, in order to fasten to the fixed member 40 by using the screw according to the preferred embodiment of the present invention, the hole 42 for inserting the screw 1 into the fixed member 40 first. Process. At this time, the hole 42 to be processed to the fixed member 40 is processed to a diameter smaller than the outer diameter of the molding screw threads 32, 34 so that the female screw 44 can be molded. When the hole 42 is finished, the molding screw 34 formed at one end of the screw 1, that is, at one end of the molding threads 32 and 34, is positioned at the inlet of the hole 42. Subsequently, when the screw 1 is rotated clockwise by fastening a fastening tool such as an electric screwdriver to the fastening groove 12 of the head 10 of the screw 1, the screw 1 is first formed. The molding screw 34 forming a 35 ° angle formed at one end of the c) rotates in contact with the inner circumferential surface of the hole 42 and forms a female screw 44 having a 35 ° angle on the inner circumferential surface of the hole 42. At this time, the female thread 44 can be molded with a small torque, so that the end of the female thread 44 is formed to be sharper than the thread 22a having the 35 ° angle of 60 ° so that the female thread 44 can be easily formed on the inner circumferential surface of the hole 42. Because it can. Subsequently, the forming screw thread 34, which forms an angle of 35 °, is rotated so that the female screw 44 is formed on the inner circumferential surface of the hole 42 and moved to the lower side, followed by 60 ° angle and 35 ° along the preformed female screw 44. An angled molding screw 32 forms a female screw 44 formed at a 35 ° angle into a female screw 44 gradually forming a 60 ° angle. That is, the cross-sectional area of the molding screw thread 32 forming a 60 ° angle is gradually increased, and the preformed female screw 44 is gradually formed into the female screw 44 forming a 60 ° angle. As shown in FIG. 4, a female thread formed by contacting the threaded portion 30 with a fastening portion 22, that is, a thread 22 constituting a 60 ° angle, is formed at a 60 ° angle by molding threads 32 and 34. It is fastened to 44.

As such, the screw is fastened by forming a female screw on the fixed member, so that a tapping process for forming the female screw is not necessary and can be firmly fastened.

In addition, by forming and fastening the female screw to the fixing member, the male screw and the female screw are in contact with strong friction, so that the loosening phenomenon by external force does not occur after the screw is fastened.

1 is a front view of a screw according to a preferred embodiment of the present invention;

2 is an enlarged cross-sectional view of a portion of the screw shown in FIG. 1;

3 is a cross-sectional view showing a state before the screw shown in FIG. 1 is fastened;

4 is a cross-sectional view showing a state in which the screw shown in FIG.

5 is a front view of a screw according to the prior art.

10: head 12: fastening groove

20: fastening part 30: screw molding part

40: fixed member

Claims

Head portion made so that the fastening tool can be inserted to one side;

Screw comprising a.

The method of claim 1,

Screw angle of the fastening portion is characterized in that 60 °.

The method of claim 2,

The screw thread of the screw forming portion is characterized in that the outer diameter of the screw thread is formed to become smaller toward one end side.

The method of claim 3, wherein

The screw forming unit is characterized in that formed to form a 3 to 6 pitch.

The method according to any one of claims 1 to 4,

The screw thread of the threaded part is formed at an angle of 60 °, a screw thread forming an angle of 35 ° in the vertex area is formed, the screw thread formed at the end of one end of the threaded part is formed at a 35 ° angle .

The method of claim 5,

The screw thread formed at a 60 ° angle of the screw forming portion is characterized in that the cross-sectional area is formed to become smaller toward one end side of the screw forming portion.