KR100450167B1 - Cover hinge mechanism of cellular phone - Google Patents

Abstract

According to the present invention, the cover is opened and closed with respect to the main body, and the front and rear surfaces of the cover are inverted so that the LCD screen of the cover can be seen even when the cellular phone is in an off state. The present invention for this purpose, the cover 20 is installed in the hinge cylinder 100 and the rotation space 110 formed in the hinge cylinder 100 to engage the hinge rotatable from the main body 10, the cover 20 Rotation part 200 to enable the rotation action of the) and the rotating space portion 130 formed in the hinge cylinder 100 is inserted into the cover 20 is stopped in the closed state and the open state with respect to the main body 10 A cover hinge device for a mobile phone including a clutch unit 300 for generating a force, and since the cover 20 is rotated by the rotation unit 200, the liquid crystal display 30 of the cover 20 when the mobile phone is not used. By rotating the outward there is an effect that can see the LCD screen (30).

Description

Cover hinge device for mobile phone {COVER HINGE MECHANISM OF CELLULAR PHONE}

The present invention relates to a cover hinge device of a mobile phone, and in particular, the cover is opened and closed with respect to the main body, and the front and rear surfaces of the cover are inverted, so that the LCD screen of the cover can be seen even in the off state of the mobile phone.

As an example of a hinge device of a mobile phone, a 'hinge device of a mobile phone' is disclosed in patent application No. 10-1998-0046799.

The cover hinge device of a general mobile phone including the patent application uses a hinge device as an intermediary means for causing the cover (meaning to include a flip or folder) to be hinged from the main body.

Such a hinge device has a function of maintaining the current state with a certain amount of elastic force in the closed state and the open state of the cover, respectively.

On the other hand, the cover is provided with a liquid crystal screen on the surface in contact with the main body, the liquid crystal screen is in contact with the main body when the cover is closed with respect to the main body so that the user can not see. Therefore, the liquid crystal screen of the cover is automatically set to be always off when the mobile phone is turned off, and the liquid crystal screen is turned on only when the cover is opened.

By the way, since the cover hinge device of the general mobile phone as illustrated above only serves to open and close the cover with respect to the main body, there is an inconvenience that the user cannot see the LCD screen when the cover is closed.

The present invention has been made to solve the above problems, an object of the present invention is that the cover is opened and closed with respect to the main body, while the front and rear surfaces of the cover is inverted, so that the LCD screen of the cover can be seen even in the off state of the mobile phone It is to ensure that.

1 is an exploded perspective view of a cover hinge device according to a first embodiment of the present invention.

Figure 2 is a cross-sectional view of the coupling hinge of the cover hinge device shown in FIG.

3 is a perspective view of the mobile phone to which the cover hinge device shown in Figure 1 is applied.

4 is a perspective view of the cover in the open state in FIG.

5 is a perspective view of a state in which the cover is rotated in FIG.

6 is a perspective view of the cover in the closed state in FIG.

7 is an exploded perspective view of the cover hinge device according to the second embodiment of the present invention.

8 is a cross-sectional view of the coupling hinge shown in FIG.

9 is an exploded perspective view of the cover hinge device according to the third embodiment of the present invention.

10 is a cross-sectional view of the coupling hinge of the cover hinge device shown in FIG.

<Explanation of symbols for main parts of drawing>

10: main body 20: cover

30: LCD screen 100: hinge cylinder

110: rotation space portion 120: central axis

122: first annular groove 124: first guide protrusion

126: second stop projection 130: the rotating space portion

132: third through hole 134: second guide groove

140: side opening 142: fourth through hole

150: third coupling shaft 152: third annular groove

160: third guide groove 200: rotation unit

210: cylinder 212: arm

214: first through hole 220: hollow

222: locking hole 224: first stop projection

230: first compression spring 240: bushing

242: second through hole 244: fitting groove

246: first guide groove 250: leaf spring

260: first ring 262: washer

300: clutch 310: second compression spring

320: first fixed slip portion 322: first waveform surface

324: first coupling hole 326: second guide protrusion

330: first rotating slip portion 332: second waveform surface

334: Second Combination Hole 336: First Government

340: first coupling shaft 342: second annular groove

344: locking end 350: second ring

400: third compression spring 410: second fixed slip portion

412: third wave surface 414: third coupling hole

420: second rotary slip portion 422: fourth waveform surface

424: second coupling shaft 426: second fixing part

500: fourth compression spring 510: third fixed slip portion

512: fifth wave surface 514: fourth coupling hole

516: third guide protrusion 520: third rotary slip portion

522: sixth wave surface 524: fifth coupling hole

526: Third Government 530: Third Ring

The present invention for achieving the above object, in the mobile phone having a main body having a first surface, and a cover having a second surface which is in surface contact with the first surface, the cover axis of one point of the main body A hinge cylinder for coupling the cover and the main body to enable hinge rotation in a lifted direction; A rotation part installed in the rotation space part formed in the hinge cylinder and rotating in a direction parallel to the first surface in a state in which the cover is rotated upright from the first surface; And a clutch part inserted into a rotation space formed in the hinge cylinder to generate a predetermined stopping force in a closed state and an open state, respectively, in a direction in which the cover is lifted with respect to the main body. to provide.

Hereinafter, a first embodiment of a cover rotation apparatus of a mobile phone according to the present invention will be described.

1 is an exploded perspective view of a cover hinge device according to a first embodiment of the present invention, Figure 2 is a cross-sectional view of the coupling hinge device shown in FIG.

The mobile phone has a main body 10 having a first face and a cover having a second face in surface contact with the first face. The first surface of the main body 10 is provided with a keypad and various function buttons, and the second surface of the cover 20 is provided with a liquid crystal display 30. The cover hinge device of the mobile phone according to the present embodiment includes a cover ( A hinge cylinder (100) which couples the cover (20) and the main body (10) so that the hinge is rotated in a direction in which the 20 is lifted about one point of the main body (10); A rotation part 200 installed in the rotation space part 110 formed in the hinge cylinder 100 and rotating in a direction parallel to the first surface in a state in which the cover 20 is rotated upright from the first surface; And a clutch part inserted into the rotation space 130 formed in the hinge cylinder 100 to generate a predetermined stopping force in the closed state and the open state, respectively, in the direction in which the cover 20 is lifted with respect to the main body 10 ( 300);

The rotation part 200 may include a central axis 120 protruding upward from the bottom of the rotation space part 110 and having a first annular groove 122 formed at the protruding end thereof; A hollow 220 opened downward is formed, and a first through hole 214 through which the central axis 120 penetrates is formed on an upper surface of the hollow 220, and an arm 212 coupled to the cover 20 is formed. A cylinder 210 formed above; A first compression spring 230 inserted into the central shaft 120 and inserted into the hollow 220; A second through hole 242 press-fitted into the central shaft 120, and a bushing 240 inserted into the hollow 220 under the first compression spring 230; And a first ear ring 260 coupled to the first annular groove 122 above the cylinder 210.

Arm 212 formed on the top of the cylinder 210 is for coupling to the cover 20 with a screw.

And the cylinder 210, a pair of engaging holes 222 penetrated to both sides from the hollow 220 is formed, a pair of fitting grooves 244 are formed on both sides of the bushing 240, the fitting groove ( 244 is coupled to a pair of leaf spring 250 is bent so that the center is inserted into the engaging hole 222.

In addition, the first guide protrusion 124 is formed on the outer surface of the central shaft 120, the first guide protrusion 124 is coupled to the side surface of the second through hole 242 in the bushing 240. 246 is formed. Therefore, after the bushing 240 is pressed into the central axis 120, the first guide protrusion 124 is prevented from rotating.

The first stop protrusion 224 is formed on the outer circumferential surface of the cylinder 210, and the pair of first stop protrusions 224 are caught by the rotation space 110 of the hinge cylinder 100 at 180 ° intervals. Two stop projections 126 are formed. Therefore, the cylinder 210 may rotate by repeating 180 ° about the central axis 120. Therefore, the wires connecting the signals of the main body 10 and the cover 20 are prevented from being twisted.

Meanwhile, the clutch unit 300 may include a second compression spring 310 inserted into the rotation space 130 opened in the direction in which the hinge cylinder 100 is supported by the main body 10; Inserted into the rotational space 130 from the outside of the second compression spring 310, the first coupling hole 324 is formed in the center, the second guide groove 134 formed in the rotational space 130 A second guide protrusion 326 is formed to be slidably coupled in the direction in which the second compression spring 310 is compressed. The second guide protrusion 326 is formed to have a continuous surface horizontally directed toward the first coupling hole 324. A first fixed slip part 320 having a first waveform surface 322 having a wave shape bend in wavelength; A second coupling hole 334 corresponding to the first coupling hole 324 is formed to have a rotatable shape in the rotation space 130 and is inserted to the outside of the first fixing slip part 320, and has a first waveform. A first rotary slip portion 330 having a second waveform surface 332 corresponding to the surface 322 and having a first fixing portion 336 fixed to the main body 10; Through the second coupling hole 334, the first coupling hole 324 and the second compression spring 310 to the third through hole 132 penetrated from the rotation space portion 130 to the rotation space portion 110 A first coupling shaft 340 formed therein and having a second annular groove 342 formed at a front end thereof, and a locking end 344 formed at the other end thereof to prevent separation of the first rotary slip 330; And a second ring 350 coupled to the second annular groove 342 in the rotation space 110.

The general mobile phone is set so that the LCD screen 30 is also turned off when the cover 20 is closed to the main body 10. In the mobile phone of the present embodiment, the cover 20 is inverted so that the LCD screen 30 faces outward. In the case of closing to the main body 10, the sensor and the control function to turn on the LCD screen 30 is required separately.

Hereinafter, the operation of the cover rotation apparatus of the mobile phone having the above configuration will be described.

3 is a perspective view of the mobile phone to which the cover hinge device shown in Figure 1 is applied, Figure 4 is a perspective view of the cover is open in Figure 3, Figure 5 is a perspective view of the cover is rotated in Figure 4, 6 is a perspective view of the cover in the closed state in FIG.

When the cover rotation apparatus is installed in the mobile phone, the central shaft 120 formed in the rotation space 110 of the hinge cylinder 100 has the second through hole 242 and the first compression spring 230 of the bushing 240. The first ring 260 is coupled to the first annular groove 122 of the central shaft 120 while passing through the center of the cylinder 210 and the first through hole 214 and the washer 262 of the cylinder 210. All elements are coupled to the central axis 120.

In addition, the first guide protrusion 124 of the central shaft 120 is coupled to the first guide groove 246 of the bushing 240 so that the bushing 240 is fixed to the central shaft 120 to prevent rotation. . Then, the protruding portions of the pair of leaf springs 250 coupled to the fitting grooves 244 of the bushing 240 are caught by the catching holes 222 of the cylinder 210, thereby closing and opening the cover 20. Has a force to stop in a state.

In addition, the first compression spring 230 has a lower side supported by the bushing 240 and the upper side contacts the cylinder 210 so that the cylinder 210 has elasticity in the vertical direction.

On the other hand, in the state in which the cover hinge device is assembled, the first coupling shaft 340 is the second coupling hole 334 of the first rotary slip portion 330 and the first coupling hole 324 of the first fixed slip portion 320. ) Passes through the center of the second compression spring 310 and the third through hole 132 of the hinge cylinder 100 to the rotation space portion 110 side, the second ring 350 is the rotation space portion 110 At the side) is coupled to the second annular groove 342 of the first coupling shaft 340 to prevent the separation of the first coupling shaft 340.

At this time, the second waveform surface 332 of the first rotary slip portion 330 is in surface contact with the first waveform surface 322 of the first fixed slip portion 320, the second compression spring 310 is The first fixed slip part 320 may be supported to be elastically coupled to the first rotating slip part 330.

In addition, the second guide protrusion 326 of the first fixing slip part 320 is coupled to the second guide groove 134 of the rotation space 130 to prevent rotation. In addition, the first fixing part 336 of the first rotary slip 330 is fixed to the main body 10 to prevent rotation.

When the cover 20 is closed to the main body 10, the valleys of the peaks of the first waveform surface 322 of the first fixed slip part 320 and the second waveform surface 332 of the first rotary slip part 330 are Stay connected to each other.

On the other hand, the liquid crystal display 30 is provided on the surface where the cover 20 contacts the main body 10. However, when the cover 20 is closed with respect to the main body 10, the liquid crystal display 30 of the cover 20 cannot be seen.

Therefore, when the user wants to see the LCD screen 30 while the cellular phone is turned off, the cover 20 is rotated by the hinge cylinder 100 from the main body 10 to open the shaft.

When the cover 20 starts to open, the hinge cylinder 100 fixed to the cover 20 through the central axis 120 is rotated together. In this case, the first fixed slip part 320 inserted into the pivoting space part 130 of the hinge cylinder 100 is staggered with the first rotating slip part 330 fixed to the main body 10 to form a first fixed slip part ( A phenomenon in which the first waveform surface 322 of 320 and the second waveform surface 332 of the first rotary slip portion 330 slips occurs.

When the cover 20 is opened to some extent from the main body 10, the peak of the first waveform surface 322 rotates and slides toward the peak of the second waveform surface 332 so that the second compression spring 310 is most compressed. It becomes a state.

Subsequently, when the cover 20 is opened to the call angle, the peak of the first waveform surface 322 is coupled to the valley beyond the peak of the second waveform surface 332, and the second compression spring 310 is extended to the restoring force and is formed. One fixed slip part 320 is supported.

In this operation, the first coupling shaft 340 is inserted into the second coupling hole 334 of the first rotary slip part 330 and the first coupling hole 324 of the first fixed slip part 320, thereby providing a first coupling shaft 340. The center of the fixed slip 320 and the first rotary slip 330 is firmly supported to facilitate the interaction. In addition, the second guide protrusion 326 of the first fixed slip part 320 is inserted into the second guide groove 134 of the hinge cylinder 100 to prevent rotational movement, and the first fixed slip part 320 is formed of the first guide slip part 320. Due to the elasticity of the two compression springs 310, only linear motion is achieved.

As such, when the cover 20 is rotated in one direction while the cover 20 is opened, the cylinder 210 fixed to the cover 20 rotates integrally.

Accordingly, the bushing 240 fixed to the central shaft 120 formed in the rotation space 110 of the hinge cylinder 100 coupled to the main body 10 does not rotate, but is coupled to the bushing 240 to form a cylinder ( The leaf spring 250 fitted into the engaging hole 222 of the 210 is pressed and compressed as the cylinder 210 rotates, is released from the engaging hole 222, and the cover 20 and the cylinder 210 rotate 180 °. When the protruding portion of the leaf spring 250 is inserted into the locking hole 222 of the cylinder 210, the cover 20 is maintained in a stopped state.

The first stop protrusion 224 of the cylinder 210 is caught by the second stop protrusion 126 of the hinge cylinder 100 to prevent excessive rotation of the cylinder 210.

In this state, when the user rotates the cover 20 and closes the main body 10, the liquid crystal display 30 of the cover 20 is positioned on the upper surface, so that the user can see the liquid crystal display 30 even when the mobile phone is turned off. It becomes possible.

When the user does not see the liquid crystal display 30 of the cover 20, the reverse operation of the cover 20 is performed so that the liquid crystal display 30 of the cover 20 is rotated to face the main body 10 side. Close it.

Hereinafter, a second embodiment of the present invention will be described.

7 is an exploded perspective view of the cover hinge device according to the second embodiment of the present invention, Figure 8 is a cross-sectional view of the cover hinge device shown in FIG.

The second embodiment has a different configuration of the clutch unit 300 in the cover hinge device of the mobile phone of the first embodiment.

The clutch unit 300 of the second embodiment includes a third compression spring 400 inserted into the rotation space 130 through the side opening 140 opened in one side direction; Rotation is suppressed in the rotation space 130 and has a slidable shape in the direction of compressing the third compression spring 400 is inserted to the outside of the third compression spring 400, the third coupling hole 414 in the center A second fixed slip portion 410 having a third waveform surface 412 formed of a continuous surface horizontally directed toward the third coupling hole 414 and having a waveform curve of two wavelengths in one rotation; And a fourth waveform surface (inserted into the rotation space portion 130 from the outside of the second fixed slip portion 410, having a shape rotatable in the rotation space portion 130, and corresponding to the third waveform surface 412 ( 422 is formed, and has a second fixing part 426 fixed to the body 10 by protruding through the fourth through hole 142 formed at one side of the rotation space 130, and the third coupling hole 414. And a second rotary slip 420 having a second coupling shaft 424 fitted to the third compression spring 400.

In this second embodiment, the third compression spring 400, the second fixed slip portion 410 and the second rotary slip portion 420 is rotated through the side opening portion 140 of the hinge cylinder 100, the rotating space portion Is inserted into 130. The second fixed slip portion 410 is prevented from rotating by having a shape of sliding only back and forth without rotating in the rotation space 130.

The second coupling shaft 424 of the second rotary slip part 420 is inserted into the third coupling hole 414 of the second fixed slip part 410 to form the third waveform surface 412 and the fourth waveform surface ( 422 is maintained, and the second fixing part 426 is fixed to the main body 10 to prevent rotation of the second rotary slip part 420.

Other configurations and operations are the same as those in the first embodiment, so detailed description thereof will be omitted.

Hereinafter, a third embodiment of the present invention will be described.

FIG. 9 is an exploded perspective view of the cover hinge device according to the third embodiment of the present invention, and FIG. 10 is a cross-sectional view of the cover hinge device shown in FIG.

The third embodiment has a different configuration of the clutch unit 300 in the cover hinge device of the mobile phone of the first embodiment.

The clutch portion 300 of the third embodiment is formed toward the open side at the inner wall of the rotation space portion 130 opened in the direction in which the hinge cylinder 100 is supported by the main body 10, and at the front end thereof, A third coupling shaft 150 having an annular groove 152 formed therein; A fourth compression spring 500 inserted into the third coupling shaft 150 and inserted into the rotation space 130; Inserted into the rotational space portion 130 from the outside of the fourth compression spring 500, the fourth coupling hole 514 is formed in the center, the third guide groove 160 formed in the rotational space portion 130 A third guide protrusion 516 is slidably coupled in the direction of compressing the fourth compression spring 500, and is formed of a continuous surface that is horizontal toward the fourth coupling hole 514 and rotates at one rotation. A third fixed slip portion 510 having a fifth waveform surface 512 having a wave form bend of the wavelength; A fifth coupling hole 524 corresponding to the fourth coupling hole 514 is formed to have a rotatable shape in the rotation space 130 and is inserted to the outside of the third fixed slip portion 510. A third rotary slip portion 520 having a sixth waveform surface 522 corresponding to the surface 512 and having a third fixing portion 526 fixed to the main body 10; The third ring 530 is coupled to the third annular groove 152 on the outside of the third fixing portion 526;

In the third embodiment, the fourth coupling hole 514 and the third rotation of the fourth compression spring 500 and the third fixed slip part 510 are rotated by the third coupling shaft 150 formed in the rotation space 130. The fifth coupling hole 524 of the slip portion 520 is coupled. The third ring 530 is coupled to the third annular groove 152 of the third coupling shaft 150 at the outside of the third rotary slip 520 to prevent the third rotary slip 520 from being separated. do.

The third guide protrusion 516 of the third fixed slip part 510 is inserted into the third guide groove 160 formed in the hinge cylinder 100 to prevent rotation of the third fixed slip part 510.

The fourth compression spring 500 holds the third fixed slip part 510 so that the fifth waveform face 512 of the third fixed slip part 510 and the sixth waveform face of the third rotary slip part 520 are provided. 522 is exerted to make good contact.

The third fixing part 526 of the third rotary slip 520 is fixed to the main body 10.

Other configurations and operations are the same as those in the first embodiment, so detailed description thereof will be omitted.

As described above, the present invention, the cover 20 is installed on the hinge cylinder 100 and the rotation space 110 formed in the hinge cylinder 100 to engage the hinge rotatable from the main body 10, the cover The rotation part 200 which enables the rotation action of the 20 and the rotation space part 130 formed in the hinge cylinder 100 are inserted into the closed state and the open state with respect to the main body 10. Cover hinge device for a mobile phone including a clutch 300 for generating a stopping force in the cover, since the rotation of the cover 20 by the rotation unit 200, the liquid crystal display of the cover 20 when the mobile phone is not used ( There is an effect that the liquid crystal display 30 can be seen by rotating the outside 30).

In the above, the present invention has been described as an embodiment, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described embodiments, and has a general knowledge in the field to which the present invention pertains without departing from the gist of the present invention. Anyone who grows up will be able to make various variations.

Claims (8)

A mobile phone having a main body 10 having a first surface and a cover having a second surface in surface contact with the first surface, A hinge cylinder (100) for coupling the cover (20) and the main body (10) so that the cover (20) can rotate in a direction lifted with respect to one point of the main body (10); A rotation part installed in the rotation space part 110 formed in the hinge cylinder 100 and rotating in a direction parallel to the first surface in a state in which the cover 20 is rotated upright from the first surface. 200; And A clutch inserted into the rotation space 130 formed in the hinge cylinder 100 to generate a predetermined stopping force in the closed state and the open state, respectively, in the direction in which the cover 20 is lifted with respect to the main body 10. Cover 300; mobile phone cover hinge device comprising a. The method of claim 1, wherein the rotation unit 200, A central shaft 120 protruding upward from the bottom of the rotation space 110 and having a first annular groove 122 formed at the protruding end thereof; A hollow 220 opened downward is formed, a first through hole 214 through which the central axis 120 penetrates is formed on an upper surface of the hollow 220, and an arm coupled to the cover 20. A cylinder 210 formed thereon 212; A first compression spring 230 inserted into the central shaft 120 and inserted into the hollow 220; A second through hole 242 press-fitted into the central axis 120, and a bushing 240 inserted into the hollow 220 under the first compression spring 230; And Cover hinge device of a mobile phone comprising a; first ring 260 coupled to the first annular groove (122) above the cylinder (210). The method of claim 2, wherein the cylinder (210), a pair of engaging holes (222) penetrating from both sides of the hollow (220) is formed; A pair of fitting grooves 244 are formed at both sides of the bushing 240; Cover fitting device of the mobile phone, characterized in that the fitting groove 244 is coupled to a pair of leaf springs 250 bent so that the center portion is inserted into the engaging hole (222). The method of claim 2, wherein the first guide protrusion (124) is formed on the outer surface of the central axis (120); The bushing 240, the cover hinge device of the mobile phone, characterized in that the first guide groove 246 is formed on the side of the second through hole 242 is coupled to the first guide projection (124). The outer peripheral surface of the cylinder 210, the first stop projection (224) is formed; Cover hinge device of the mobile phone, characterized in that the rotation space portion 110 of the hinge cylinder 100 is provided with a pair of second stop projections 126 to the first stop projections 224 at 180 ° intervals. . The method of claim 1, wherein the clutch unit 300, A second compression spring 310 inserted into the pivot space 130 opened in a direction in which the hinge cylinder 100 is supported by the main body 10; The second guide groove is inserted into the rotation space portion 130 from the outside of the second compression spring 310, the first coupling hole 324 is formed in the center, and formed in the rotation space portion 130 ( A second guide protrusion 326 slidably coupled to the second compression spring 310 in a compression direction is formed at 134, and is formed in a continuous surface horizontally toward the first coupling hole 324. A first fixed slip part 320 having a first waveform surface 322 having a waveform curve of two wavelengths in one rotation; A second coupling hole 334 corresponding to the first coupling hole 324 is formed to have a rotatable shape in the rotation space 130 and is inserted to the outside of the first fixing slip part 320. A first rotary slip 330 having a second waveform surface 332 corresponding to the first waveform surface 322 and having a first fixing part 336 fixed to the main body 10; A third through hole penetrating through the second coupling hole 334, the first coupling hole 324, and the second compression spring 310 from the rotational space part 130 to the rotation space part 110. The first coupling shaft is passed through the ball 132, the second annular groove 342 is formed at the front end, and the locking end 344 is formed at the other end to prevent the first rotary slip 330 from being separated. 340); And Cover hinge device of a mobile phone comprising a; second ring (350) coupled to the second annular groove (342) in the rotation space (110). The method of claim 1, wherein the clutch unit 300, the third compression spring 400 is inserted into the rotation space 130 through the side opening portion 140 opened in one direction; Rotation is suppressed in the rotation space 130 and has a slidable shape in the direction of compressing the third compression spring is inserted to the outside of the third compression spring 400, the third coupling hole 414 in the center The second fixed slip portion 410 is formed of a continuous surface that is horizontal toward the third coupling hole 414 and the third waveform surface 412 having a waveform wave of two wavelengths in one rotation is formed. ; And A fourth inserted into the pivot space 130 from the outside of the second fixed slip part 410, having a shape rotatable in the pivot space 130, and corresponding to the third waveform surface 412; The corrugated surface 422 is formed, and has a second fixing part 426 fixed to the main body 10 by protruding through the fourth through hole 142 formed in the pivoting space 130. And a second rotary slip unit (420) having a third coupling hole (414) and a second coupling shaft (424) fitted to the third compression spring (400). The method of claim 1, wherein the clutch unit 300, The hinge cylinder 100 is formed toward the open side from the inner wall of the rotating space 130 is opened in the direction supported by the main body 10, the third annular groove 152 is formed at the tip Three coupling shafts 150; A fourth compression spring 500 inserted into the third coupling shaft 150 and inserted into the rotation space 130; The third guide groove is inserted into the pivot space 130 from the outside of the fourth compression spring 500, the fourth coupling hole 514 is formed in the center, and formed in the pivot space 130 A third guide protrusion 516 is slidably coupled to the fourth compression spring 500 in the compression direction of the fourth compression spring 500, and is formed in a continuous surface horizontally toward the fourth coupling hole 514. A third fixed slip portion 510 having a fifth waveform surface 512 having a waveform curve of two wavelengths in one rotation; A fifth coupling hole 524 corresponding to the fourth coupling hole 514 is formed to have a rotatable shape in the rotation space 130 and is inserted to the outside of the third fixed slip portion 510. A third rotary slip portion 520 having a sixth waveform surface 522 corresponding to the fifth waveform surface 512 and having a third fixing part 526 fixed to the main body 10; Cover hinge device of a mobile phone comprising a; third ring (530) coupled to the third annular groove (152) on the outside of the third fixing portion (526).