KR20100098192A

KR20100098192A - The screw

Info

Publication number: KR20100098192A
Application number: KR1020090017234A
Authority: KR
Inventors: 신명현
Original assignee: 타스코(주)
Priority date: 2009-02-27
Filing date: 2009-02-27
Publication date: 2010-09-06

Abstract

PURPOSE: A screw is provided to ensure maximum coupling force by being coupled to match with the direction of the central axis of a through-hole for coupling. CONSTITUTION: A screw(100) comprises a head(10), an axis(20), a coupling thread(30), and a guide thread(40). The axis is connected to one side of the head. One end of the coupling thread is formed on the outer surface of one end of the axis adjacent to the head. The guide thread is formed on the outer surface of the axis adjacent to the other end of the coupling thread. The outer diameter of the guide thread is smaller than the outer diameter of the coupling thread and the cross section of the guide thread has a trapezoid or round shape. The guide thread comprises two to four threads.

Description

The screw

The present invention relates to a screw.

Generally, screws have continuous spiral grooves or threads along the circumference of the cylindrical screw shaft and are used for machine manufacturing, which are classified into various types according to the shape of the screw heads and the threads.

In the case of assembling electronic products, the screw is inserted into the through hole for fastening formed on one side of the case, which is the base material, in order to fasten the front and rear cases, and then assembled by rotating the screw several times. do. At this time, the screw thread formed in the longitudinal direction of the screw makes a screw thread on the inner wall surface of the fastening through-hole, and the screw thread formed on the inner wall of the screw thread and the thread is engaged with each other.

In addition, the screw according to the prior art includes a screw head, a screw shaft extending in a cylindrical shape on one side of the screw head, and a screw thread formed continuously along the outer circumference of the screw shaft. Here, the screw shaft is formed so that one end is extended from the screw head, the other end is smaller in diameter.

However, in the conventional screw configured as described above, in the process of inserting and fastening the screw into the fastening through-hole, there is no separate guide means for correcting the advancing direction of the screw. Insertion is inclined, not in agreement with the direction of the center axis of the fastening through-hole, so that the screw is not fastened accurately, there is a problem in that the case is discarded because the fastening force is reduced despite the reuse.

The problem to be solved by the present invention is that the screw inserted into the through hole for fastening is normally fastened to the through hole to secure the maximum fastening force, and is not damaged in the process of detachment of the thread formed in the base material. Therefore, it is to provide a screw that can maintain the initial tightening force between the screw and the base material in spite of repeated tightening.

A screw according to an embodiment of the present invention comprises a screw head, a screw shaft extended to one side of the screw head, and one end of which is formed from an outer circumference of a screw shaft at one end of the screw shaft adjacent to the screw head. And a guide thread portion formed from an outer circumference of the screw shaft adjacent to the other end of the fastening thread portion, wherein an outer diameter of the guide thread portion is smaller than an outer diameter of the fastening thread portion. The thread of the guide thread portion is either a trapezoidal screw or a round screw.

The guide thread portion may be two to four threads.

The thread of the guide thread portion may be formed to have a smaller outer diameter of the thread as it approaches one end of the screw shaft.

The other end of the screw shaft may be curved.

According to an embodiment of the present invention, since the screw inserted into the fastening through-hole formed in the base material is guided to coincide with the direction of the central axis of the fastening through-hole, the fastening is normally completed, thereby completing the maximum fastening force. There is an advantage to be secured.

In addition, when removing the screw fastened to the base material and then tightening again, the screw thread formed on the base material is not damaged even in a repeated detachment process, so that the first fastening force between the screw and the base material can be maintained despite the repeated fastening. There is.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Like parts are designated by like reference numerals throughout the specification.

Then, a screw according to an embodiment of the present invention will be described with reference to FIGS. 1 to 2.

1 is a perspective view showing a screw according to an embodiment of the present invention, Figure 2 is a front view showing the shape of the screw in FIG.

1 to 2, the screw 100 according to an embodiment of the present invention includes a screw head 10, a screw shaft 20, a fastening screw thread part 30, and a guide screw thread part 40. do.

The screw head 10 is also called a screw head. One side of the screw head 10 is provided with a mounting groove 11, the mounting groove 11 is caught by one end of the driver (driver) used to fasten the screw. Therefore, since one end of the driver (settle) to be seated, the shape of the seating groove 11 may be a cross (+) groove or a straight (-) groove.

The screw shaft 20 is a cylindrical component that is integrally formed on the other side of the screw head 10. A fastening threaded portion 30 and a guide threaded portion 40 are formed along the outer circumference of the screw shaft 20, and the fastening screwed portion (from one end of the screw shaft 20 adjacent to the screw head 10) is formed. 30 is formed, and the guide threaded portion 40 is formed in the section from the end of the fastening threaded portion 30 to the other end of the remaining screw shaft 20.

In addition, the other end of the screw shaft 20 may be curved (see FIGS. 1 to 6), and may be rectangular (see FIG. 8) or trapezoidal (FIG. 9).

Then, as the screw 100 is fastened, the fastening screw thread part 30 forms a screw thread on the inner wall surface of the fastening through hole 50 of the first and second cases 61 and 62 constituting the base material 60. The first case 61 and the second case 62 are firmly coupled by the fastening screw thread 30.

In addition, the guide threaded portion 40, the screw 100 is guided in the same direction as the direction of the center axis of the fastening through-hole 50 in the process of fastening the screw 100, the normal fastening is completed, The first case 61 and the second case 62 is a component for generating the maximum fastening force. At this time, the number of threads of the guide threaded portion 40 is preferably two to four, four or more may be installed.

That is, before the screw 100 is fastened to the inner wall surface of the fastening through-hole 50 of the first and second cases 61 and 62, the fastening part is provided for a section corresponding to the corresponding number of threads of the guide thread part 40. Since the guide thread portion 40 is guided to the inner wall surface of the through hole 50, the insertion direction of the screw 100 is maintained in the same direction as the central axis of the through hole 50 for fastening.

In addition, the guide thread portion 40 may be formed as a single thread that is integrally connected, it may be cut by a predetermined interval may be made of a plurality of unit threads, made of a concentric circle, a plurality of unit guides of concentric circles The threads may be configured to be arranged at regular intervals.

In addition, the fastening through hole 50 is formed at one side of the first and second casings 61 and 62 constituting the base material 60, respectively. When the screw 100 is first inserted into the base material 60, the fastening is started through the fastening through hole 50, and the fastening through hole 50 serves as a guide hole for guiding the fastening of the screw 100. Done. Particularly, according to the present invention, the guide thread portion 40 is guided to the inner wall surface of the fastening through-hole 50 at the initial stage of screw fastening, and thereafter, the fastening thread portion 30 connected to the guide thread portion 40. The fastening proceeds while forming a screw thread on the inner wall surface of the temporary fastening through hole 50.

Therefore, the insertion direction of the screw 100 is made the same as the direction of the central axis of the fastening through-hole 50, the screw 100 is inserted into the fastening through-hole 50 is the fastening through-hole 50 Is fastened in the same direction as the central axis direction of the base material 60 is normally coupled with, the screw 100 is maintained at the maximum clamping force.

On the other hand, a guide member having a predetermined length is attached to the end of the screw shaft as a guide means for correcting the traveling direction of the screw can be used. However, in the case of the rectangular guide means, when the screw is removed and reused, the screw thread formed on the base material may be damaged when the screw is first combined with the screw during the removal process, and thus the tightening force may be reduced when the screw is reused. .

And, with respect to the fastening operation applying the screw according to an embodiment of the present invention, it will be described with reference to Figs.

Figure 3 is a front view showing the working state at the initial time when the screw is guided to the through hole for fastening according to an embodiment of the present invention, Figure 4 is the screw is guided to the fastening through hole, the fastening work is in progress Figure 5 is a front view showing the state, Figure 5 is a front view showing the working state at the final time when the screw is completely fastened to the through hole for fastening.

3 to 5, the other end of the screw shaft 20 is first inserted into the fastening through hole 50 for fastening the screw (see FIG. 3), followed by the other of the screw shaft 20. When the screw insertion angle is incorrect at the beginning of insertion, since the outside of the thread constituting the guide thread portion 40 adjacent to the side end, that is, the peak portion is guided to the inner wall surface of the through hole 50 for fastening (Fig. 3). Even if α 1), the initial wrong insertion angle is gradually returned to the normal position (see α 2 of FIG. 4) and insertion is performed (see FIG. 4).

Then, the insertion angle is gradually changed to maintain the top, and the fastening starts from one end of the fastening screw thread portion 30 which begins to form at the end of the guide screw thread portion 40, the screw head (10) The back portion 12 of)) is in contact with the surface of the first case 61 forming the base material 60 is terminated by stopping the fastening (see Fig. 5).

At this time, the screw head 10 is seated in the screw head seating groove (611).

In addition, the shape of the screw according to another embodiment will be described with reference to FIG. 6.

Referring to FIG. 6, the thread forming the guide threaded portion 40 formed at one side of the outer surface of the screw shaft 20 may be configured as a trapezoidal screw as shown in FIG. 3, but is configured as a round screw as shown in FIG. 7. can do. In addition, it can also be comprised by square screws.

In addition, the shape of the screw according to another embodiment will be described with reference to FIG. 7.

Referring to FIG. 7, unlike the embodiment of FIGS. 1 to 6 in which the outer diameters of the threads of the guide thread part 40 are generally the same, the threads of the guide thread part 40 are the screw shaft 20. The closer to one end of, the smaller the outer diameter of the thread (that is, Ф2 <Ф1 in Figure 7), which makes it easier to insert the screw 100 into the fastening through-hole 50.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of the present invention.

1 is a perspective view showing a screw according to an embodiment of the present invention,

Figure 2 is a front view showing the shape of the screw in Figure 1,

3 is a front view showing a working state at an initial time point at which a screw is guided to a through hole for fastening according to an embodiment of the present invention;

4 is a front view showing a working state in which the fastening operation is carried out after the screw is guided to the through hole for fastening,

5 is a front view showing the working state at the final time when the screw is completely fastened to the through hole for fastening,

6 is a front view showing the shape of a screw according to another embodiment;

7 is a front view showing the shape of a screw according to another embodiment;

8 is a front view showing that the shape of the other end of the screw shaft is square,

9 is a front view showing that the shape of the other end of the screw shaft is trapezoidal.

10: screw head 11: seating groove

12: rear part 20: screw shaft

30: tightening thread 40: guide thread

50: through hole for fastening 60: the base material

61,62: 1st, 2nd case 611: screw head seating groove

100: screw α1, α2: screw insertion angle

D: Screwdriver Ф1, Ф2: Thread Outside Diameter

Claims

Screw head,

A screw shaft coupled to one side of the screw head,

A fastening thread portion formed at one end of an outer circumference of one end of the screw shaft adjacent to the screw head, and

Guide threaded portion formed on the outer circumference of the screw shaft adjacent to the other end of the fastening threaded portion

Including;

The outer diameter of the guide thread portion is formed smaller than the outer diameter of the fastening thread portion, the cross section of the thread of the guide thread portion is trapezoidal or round shape

screw.

In claim 1,

The guide thread portion is a screw of 2 to 4 threads.

In claim 1,

The screw thread of the guide thread portion is formed so that the outer diameter of the screw thread is smaller the closer to one end of the screw shaft.

In claim 1,

And the other end of the screw shaft is curved.