KR200353336Y1 - Hinge device having slant cam surface for free position stop section - Google Patents

Abstract

The present invention relates to a hinge device, and more particularly, to a hinge device for connecting the two units in a device (for example, a mobile phone, a PDA, a portable computer, etc.) having two units coupled to fold or unfold. . According to the present invention, a hinge device for connecting a first unit and a second unit that can be folded or unfolded relatively by rotating about a rotation axis, comprising: a rotating member rotatable about the rotation axis, and the rotation axis A linear movable member capable of linear movement along the elastic member and an elastic member for pushing the linear movable member toward the rotary member, wherein any one of the rotary member and the linear movable member has a cam surface, and the other member A cam follower which interacts with the cam face, the cam face having an arbitrary position stop section for keeping the cam follower stationary, and the random position stop section is provided with a hinge device at least partially inclined. .

Description

Hinge device with inclined cam surface for random position stop section {HINGE DEVICE HAVING SLANT CAM SURFACE FOR FREE POSITION STOP SECTION}

The present invention relates to a hinge device, and more particularly, to a hinge device for connecting the two units in a device (for example, a mobile phone, a PDA, a portable computer, etc.) having two units coupled to fold or unfold. .

The configuration of a conventional hinge device used for a folding type mobile phone and a portable device is as follows. The hinge device includes a rotating member, a linear moving member, an elastic member, and a housing. The housing accommodates the rotating member, the linear moving member, and the elastic member. The rotating member may rotate about a rotation axis within the housing, and a portion including the rotation shaft may protrude out of the housing to form a coupling portion. The linear moving member is in contact with the rotating member but does not rotate in the housing and linearly moves along the rotation axis of the housing. The elastic member exerts a force such that the linear member and the rotary member are in close contact with each other in the housing. At this time, any one of the linear movement member and the rotating member is provided with a cam surface and the cam follower is provided on the other, so that the rotating member is easily rotated in some sections and fixed at a predetermined position. At this time, in some cases, an arbitrary position stop section for forming a temporary stop state at an arbitrary position may be formed. Such an arbitrary position stop section is formed by horizontally not tilting a part of the cam surface so that there is no movement of the linear moving member in the section. The rotational force that the user must act on the mobile phone in order to expand or fold the mobile phone in the random position stop section thus formed is different. For this reason, in the stop position of arbitrary position, even one side may move with a weak external force, but it may occur when the force is applied to the other side. This problem is because the case unit of the cellular phone connected to the hinge device acts as a turning force by its own weight.

An object of the present invention is to provide a hinge device having an arbitrary position stop section in consideration of the rotational force by the weight of the unit connected to the hinge device.

1 is a plan view of a clamshell-type cellular phone equipped with a hinge device according to an embodiment of the present invention, showing a magnified view of the mounted hinge device.

Figure 2 is an exploded perspective view of the hinge device of Figure 1

FIG. 3 is a view showing the cam surface formed on the linear moving member of FIG. 2 together with the cam follower of the rotating member. FIG.

4 is a side view of the folding cellular phone of FIG.

FIG. 5 is a view showing the hinge device of FIG. 1 as viewed from the end wall side of the housing; FIG.

<Description of the symbols for the main parts of the drawings>

20: hinge device 30: housing

40: rotating member 421: contact surface

50: linear moving member 46, 47: cam driven protrusion

54 cam surface 80 elastic member

541, 544: automatic movement section

542, 545: Arbitrary position stop section

543, 546: Insertion groove 5411, 5441: Top

5412, 5442: first inclined portion 5413, 5443: second inclined portion

According to one aspect of the present invention, in the hinge device for connecting the first unit and the second unit that can be rotated or unfolded relative to the rotation axis relative to the rotation axis, the rotating member rotatable about the rotation axis, A linear movement member capable of linear movement along the rotation axis, and an elastic member for pushing the linear movement member toward the rotation member, wherein any one of the rotation member and the linear movement member has a cam surface, and the other The member has a cam follower which interacts with the cam face, and the cam face has an arbitrary position stop section in which the cam follower maintains a stationary state, wherein the random position stop section has at least a portion of the hinge device inclined. Is provided.

The arbitrary position stop section may be inclined to move in a direction away from the rotating member when the cam follower is moved so that the first and second units are unfolded.

The cam surface further includes an automatic moving section which is connected to one end of the arbitrary position stop section and automatically moves the cam follower without an external force, wherein the linear moving section is located at the side farthest from the rotating member. A top portion to be positioned and two inclined portions inclined downward to both sides of the top portion, one of the two inclined portion may be connected to the arbitrary position stop section.

The cam surface further includes an insertion groove into which the cam follower is inserted and fixed, and the insertion groove may be connected to one end of the arbitrary position stop section.

It may further include a housing fixed to the first unit for receiving the linear movement member.

The rotating member may have a contact surface in contact with the second unit to serve as a key surface, and the contact surface may be provided to be located radially outward of the rotation axis than the housing.

According to another aspect of the present invention, in the hinge device for connecting the first unit and the second unit that can be folded or unfolded relatively by rotating around the axis of rotation, the housing mounted to the first unit, and the second unit A rotating member connected to the rotating member about the housing about the rotating axis, the rotating member having a contact surface in contact with the second unit and serving as a key surface, wherein the contact surface has a radius of the rotating axis than the housing. A hinge device is provided that is provided to be positioned outwardly in a direction.

The contact surface may be continuously formed in the entire section along the circumferential direction of the rotation axis on the side of the rotating member.

According to still another aspect of the present invention, a mobile telephone using the hinge device includes a first unit, a second unit, and a hinge device, wherein the second unit has a housing and a rotating member through which the hinge device passes. And a coupling passage at least partially in contact with the contact surface of the rotating member, and the first unit may have a mounting hole into which the housing of the hinge device is inserted and mounted.

In the present specification, the section where the hinge device pauses at a certain place is referred to as 'arbitrary stop section', and the term 'free stop section', 'friction stop section', 'or pause section' in another specification or the art. Also used. In this case, the term 'arbitrary stop section' means that the two folding and unfolding units of the mobile phone (or other expanding and folding devices) are stopped and apply external force due to the friction of the two members of the hinge device. If you point to a section to easily move the position. The meaning of these terms will be understood by those skilled in the art.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, the folding cellular phone 10 includes a first case unit 12 provided with a keypad and a second case unit 14 provided with a liquid crystal display. The mobile phone 10 is coupled so that the second case unit 14 rotates about the rotation axis 100 with respect to the first case unit 12 so that it can be folded and unfolded. The first case unit 12 and the second case unit 14 are coupled at both sides of the mobile phone 10 positioned on the rotation axis 100, one side of which is coupled by the hinge device 20 as shown. And the other side is not shown but is simply coupled to rotate. Referring to FIG. 1, the housing 30 of the hinge device 20 described later is inserted into and coupled to the first case unit 12 of the mobile phone 10, and the coupling portion 42 of the hinge device 20 described later. ) Is inserted into and coupled to the second case unit 14 of the cellular phone 10. In the first case unit 12 and the second case unit 14, a mounting hole 121 into which the housing 30 of the hinge device 20 is inserted and mounted and a coupling portion 42 of the hinge device 20 are fitted. Coupling passages 141 to be coupled are provided respectively. The shape and size of the mounting hole 121 of the first case unit 12 is determined so that the housing 30 of the hinge device 20 to be inserted is fitted snugly. The shape and size of the coupling passage 141 of the second case unit 14 is determined so that the coupling portion 42 of the hinge device 20 fits snugly. As such, the housing 30 of the hinge device 20 mounted on the mobile phone 10 is fixed to the first case unit 12 of the mobile phone 10, and the coupling part 42 is formed of the mobile phone 10. 2 case unit 14 is rotated together.

1 and 2, the hinge device 20 includes a housing 30, a rotating member 40, a linear moving member 40, an elastic member 80, a coupling rod 90, And a stop ring 99. The housing 30 has an end wall 32 and side walls 34 extending along the axis of rotation 100 from the end wall 32. The opposite side of the end wall 32 is open to form the inlet of the housing 42. The through hole 321 is provided in the center of the end wall 32. Through the through hole 321, the end of the coupling rod 90, which will be described later, protrudes and is engaged by a stop ring 99 such as an E-ring. The side wall 34 is formed by connecting a plurality of flat walls. These flat walls serve as a key to prevent rotation of the housing 30 when the flat walls are inserted into the mounting holes 121 of the first case unit 12 of the mobile phone 10. In addition, as will be described later, it also serves to prevent the linear movement member 50 accommodated therein from rotating. The housing 30 is made of a metal (for example, a metal such as a brass plate), and is preferably manufactured by a method of deep drawing. Alternatively, the plastic resin material may be formed by injection molding.

1 and 2, the rotating member 40 is the front of the coupling portion 42, the rear portion of the coupling portion 42 (hereinafter, the opening portion of the housing 30 in the hinge device 20 is formed ' And a cam follower 44 provided on the portion where the first end wall 32 is defined as 'back'. Coupling portion 42 is a low columnar shape, the side (421 of Figure 5) is formed by connecting a plurality of flat surfaces. These flat surfaces are contact surfaces which come into contact with the wall surface of the coupling passage 141 when they are fitted into the coupling passage 141 of the second case unit 14 of the mobile telephone 10. The contact surface 421 serves as a key to prevent the coupling portion 42 from rotating in the coupling passage 141. 5, the contact surface 421 of the coupling portion 42 is formed to be located radially outward of the rotation axis 100 than the side wall 34 of the housing 30. Correspondingly, the coupling passage 141 of the second case unit 14 of the cellular phone 10 is formed larger than the mounting hole 121 of the first case unit 12. By such a configuration, the hinge device 20 is inserted through the coupling passage 141 of the second case unit 14 so that the housing 30 is mounted in the mounting hole 121 of the first case unit 12. Coupling portion 42 is coupled to fit the coupling passage 141 of the second case unit 14. In the present embodiment, the contact surface formed to be located radially outward from the side wall 34 of the housing 30 has been described as being continuously formed in all sections along the circumferential direction of the rotation axis on the side of the rotating member. However, the present invention is not limited thereto. The contact surface located outside the housing may consist of only a part of the side of the coupling portion. In this case, the coupling passage may pass through the housing and the rotating member of the hinge device may be formed to be in contact with at least a portion of the contact surface.

2, the cam follower 44 includes first and second cam follower protrusions 46 and 47. The two cam driven protrusions 46 and 47 have the same shape and are arranged to be symmetrical with respect to the rotation axis 100, respectively. The two cam driven protrusions 46 and 47 extend toward the cam surface 54 of the linear moving member 50 described later in a direction parallel to the rotation axis 100. The two cam driven protrusions 46 and 47 are inclined so that their thickness decreases toward the ends thereof, and the ends thereof are preferably rounded. The rotating member 40 is provided with a passage hole 43 penetrating through the center along the rotation axis 100. The coupling rod 90 to be described later passes through the passage hole 43. Although not shown, the head 92 of the coupling rod 90 to be described later is expanded to accommodate the coupling portion 42 side entrance of the passage hole 43. The coupling part 42 of the rotating member 40 is located outside the housing 30, and two cam driven protrusions 46 are accommodated inside the housing 30. The rotating member 40 is rotated with respect to the housing 30 about the rotation axis 100 by the coupling rod 90.

Referring to FIG. 2, the linear movement member 50 has a cylindrical shape formed by extending from a central portion on the side opposite to the side wall 52, the cam surface 54 formed on the surface facing the rotating member 40, and the cam surface 54. The boss 56 is provided. The linear movement member 40 is provided with a through hole 58 penetrating along the rotation axis 100. The coupling rod 90 passes through the through hole 58. The side wall 52 is shaped like the side wall 34 of the housing 30. The linear movement member 50 having such a shape may be linearly moved along the rotational axis 100 in the housing 30 but not in the rotational motion. The cam surface 54 is formed along the circumferential direction of the rotation axis 100, the shape profile of which is shown in FIG. 3. Referring to FIG. 3, the cam surface 54 has a shape in which the same shape is repeated every 180 degrees, and includes a first automatic movement section 541, a first arbitrary position stop section 542, and a first insertion groove 543. ), A second automatic movement section 544, a second arbitrary position stop section 545, and a second insertion groove 546 are provided in this order. The first automatic movement section 541, the first arbitrary position stop section 542, and the first insertion groove 543 interact with the first cam driven protrusion 46, and the second automatic movement section 544, 2 Arbitrary position stop section 545, the second insertion groove 546 interacts with the second cam follower 47.

Referring to FIG. 3, the first automatic movement section 541 includes a top portion 5411 and first and second inclined portions 5412 and 5413 descending to both sides from the top portion 5411. The first inclined portion 5212 is connected to the second insertion groove 546. The second inclined portion 5413 is connected to the first arbitrary position stop section 542. The inclination of the first inclined portion 5212 and the second inclined portion 5413 is driven by the force of the elastic member (80 in FIG. 2) that pushes the linear moving member (50 in FIG. 2) toward the rotating member (40 in FIG. 2). The first cam follower 46 is defined to be able to automatically move downward from the top 5411 side. The first arbitrary position stop section 542 is formed to be inclined to extend slightly from the end of the second inclined portion 5413 toward the first insertion groove 543. The tilt of the arbitrary position stop section 542 is the first cam follower 46, although the elastic member (80 in FIG. 2) pushes the linear moving member (50 in FIG. 2) toward the rotation member (40 in FIG. 2). The first cam follower 46 should not move automatically along the descending slope of the arbitrary position stop section 542 due to the frictional force caused by the contact of the end of the arbitrary position stop section 542 with the end of the. In addition, it is desirable to determine the weight and arm length of the case unit of each mobile phone. It will be understood by those skilled in the art that the inclination of the arbitrary stop position can be determined in consideration of the friction force and the rotational force of the case unit. The inclination of the arbitrary position stop section may extend in a straight line. In contrast, since the arm length of the second case unit 14 of the mobile phone 10 varies depending on the rotation angle, the inclination of the arbitrary position stop section is curved in consideration of this. The slope may be increased gradually. The first insertion groove 543 is formed so that the first cam driven protrusion 46 is inserted and fixed so that it can be pulled out again by an external force intentionally applied when closing the mobile phone. The second automatic movement section 544, the second arbitrary position stop section 545, and the second insertion groove 546 are respectively the first automatic movement section 541, the first arbitrary position stop section 542, and the first insertion section. The configuration is the same as that of the groove 543, and a detailed description thereof will be omitted.

Now, the operation of the above embodiment will be described in detail with reference to FIGS. In FIG. 4, when the position of the second case unit 14 is at C1, the cellular phone 10 is placed horizontally in a fully folded state. At this time, the positions of the first and second cam driven protrusions 46 and 47 on the cam surface of the hinge device are P1 and R1 in FIG. In this state, the first and second cam driven protrusions 46 and 47 are positioned on the first inclined portions 5412 and 5442 of the first and second automatic moving sections 541 and 544 on the cam surface 54, respectively. In the present embodiment, the positions P1 and R1 are 90 degrees from where the second inclined portions 5413 and 5443 end (which is also where the first and second arbitrary position stop sections 542 and 545 begin). Shall be achieved. However, the present invention is not limited thereto. Since the elastic member 80 pushes the linear member 50 toward the rotary member 40, the first and second cam driven protrusions 46 and 47 are formed by the first and second automatic movement sections 541 and 544. Force is forced to move in the opposite direction to the arrow at the inclined portions 5412 and 5442. This direction is a direction in which the rotating member 40 of the hinge apparatus 10 rotates so that the 2nd case unit 14 may be folded. Hereinafter, in FIG. 3, the two cam driven protrusions 46 and 47 move in the direction of the arrow, which means that the rotating member 40 of the hinge device 10 rotates to fold the mobile phone 10. Movement of the driven protrusions 46 and 47 in the opposite direction to the arrow means that the rotating member 40 of the hinge device 10 rotates to unfold the mobile phone 10. When the first and second cam followers 46 and 47 are located at P1 and R1, respectively, the first case unit 12 and the second case unit 14 of the cellular phone 10 are already folded and the cellular phone is folded. Since the rotating member 40 of 10 receives a force to rotate the cellular phone 10 in the folding direction, the cellular phone 10 maintains the folded state more stably.

In this state, when the mobile phone 10 is spread out between the two case units 12 and 14 to be usable, the two cam driven protrusions 46 and 47 rise along the first inclined portions 5411 and 5441, respectively. (At this time, the linear moving member 50 having the cam surface 54 is moved backward and the rotating member 40 is rotated.) Moving in the direction of the arrow. The first and second automatic moving sections of the cam surface 54 are rotated. The top portions 5411 and 5441 of 541 and 544 are respectively reached and positioned at P2. At this time, the second case unit 14 of the cellular phone 10 is located at C2. If the second case unit 14 of the cellular phone 10 is located somewhere between C1 and C2 and there is no external force, the two cam driven protrusions 46 and 47 are respectively the first and second automatic movement sections 541. 544, down the first inclined portion (5412, 5442) (substantially the linear member 50 having a cam surface 54 is moved forward and the rotating member 40 is rotated) The mobile phone 10 is automatically folded by moving in the opposite direction of the arrow.

If the second case unit 14 of the cellular phone 10 continues to open in the state of being positioned at C2, the two cam driven protrusions 46 and 47 pass through the top portions 5411 and 5441 of the cam surface 54, respectively. When the two cam driven protrusions 46 and 47 pass through the tops 5411 and 5441 of the cam surface 54, respectively, the elastic member 80 pushes the linear member 50 toward the rotary member 40, so that there is no external force. The two cam followers (46, 47) are lowered along the second inclined portions (5413, 5443) of the first and second automatic movement sections (541, 544) of the cam surface 54, respectively (at this time substantially the cam surface ( 54, the linear member 50 moves forward and the rotary member 40 rotates) and then moves in the direction of the arrow and stops at P3 and R3 where the second inclined portions 5413 and 5443 end. At this time, the position of the second case unit 14 in the mobile phone 10 is C3, which is opened 90 degrees, and the second case unit 14 is in a vertical position.

From the state C3 of FIG. 4, the rotational force must be continuously applied from the outside to further open the second case unit 14. When the application of the rotational force stops in the middle, the second case unit 14 stops at that position, and the frictional force between the cam face 54 and the two cam driven protrusions 46 and 47 is caused by the force of the elastic member 80. At this time, the two cam driven protrusions 46 and 47 of the rotating member 40 are positioned at any one position on the arbitrary position stop sections 542 and 545, respectively. P4 and R4 in Fig. 3 and C4 in Fig. 4 show this state. Referring to FIG. 4, in the state of C4, the mobile phone 10 generates a rotation force to be further extended by the weight of the second case unit 14. Referring to Fig. 3, when the two cam follower protrusions 46 and 47 are located at P4 and R4 of the first and second arbitrary position stop sections 542 and 545, the first and second arbitrary position stop sections 542 respectively. , 545 are inclined to descend toward the first and second automatic movement sections 541 and 544, respectively, so that the two cam driven protrusions are formed by the elastic member 80 that pushes the linear movement member 50 toward the rotation member 40. 46 and 47 are forced to move in the downward direction (opposite the arrow, that is, the direction in which the cellular phone is folded) along the slope, respectively. This force cancels the rotational force to unfold the mobile phone 10 generated by the weight of the second case unit 14. Therefore, the effects of the rotational force of the two cam driven protrusions 46 and 47 due to the weight of the second case unit 14 are minimized and the frictional force between the inclined surfaces of the first and second arbitrary position stop sections 542 and 545 is actually reduced. Both cam driven protrusions 46 and 47 do not move and remain stationary.

In the state where the two cam followers (46, 47) are located at the first and second arbitrary position stop sections (542, 545) (for example, the states of P4 and R4), the two cam followers (46, 47) are The external force intentionally applied by a person causes the movement in the direction of the arrow or the direction opposite to the arrow. At this time, the force for unfolding the mobile phone 10 and the force for folding the rotational force due to the inclination of the first and second arbitrary position stop section 542, 545 and the weight of the second case unit 14 of the mobile phone 10 Are mutually canceled and become approximately equal by the interaction of.

When the second case unit 14 of the mobile phone 10 is located at C4 and the second case unit 14 is further opened to reach the C5 position, the two cam driven protrusions 46 and 47 respectively have a cam surface 54. It is inserted into the first and second insertion grooves 543, 546 of the) is fixed in a fully expanded state.

Now, the operation of the hinge device in the process of switching from the fully expanded state to the fully folded state will be described. That is, the process of changing the position of the second case unit 14 from the C5 position to the C1 position in FIG. 4 will be described. Two cam driven protrusions 46 and 47 are inserted into and fixed to the first and second insertion grooves 543 and 546, respectively, in the state in which the cellular phone 10 is fully deployed. In this state, rotation force must be applied to the position C3 in order to fold the cellular phone 10. Applying a force greater than or equal to a predetermined size in the fixed state, the two cam follower protrusions 46 and 47 exit from the first and second insertion grooves 543 and 546, respectively, and the first and second arbitrary position stop sections 542 and 545. To reach. When the two cam driven protrusions 46 and 47 are positioned in the first and second arbitrary position stop sections 542 and 545, the cam cams may be rotated by a rotational force equal to or greater than the frictional force. However, since the two cam followers (46, 47) must pass through the second inclined portion (5413, 5443) from the P3, R3 position to the P2, R2 position, respectively, a greater rotational force is required. After the two cam driven protrusions 46 and 47 pass through the top portions 5411 and 5441 (P2 and R2 positions), respectively, they pass through the first inclined portions 5412 and 5442, which are automatically lowered without requiring external rotational force. The phone is completely folded.

Referring to FIG. 1, the housing 30 of the hinge device 20 is inserted into the mounting hole 121 of the first case unit 12 of the mobile phone 10, and the engaging portion 42 of the hinge device 20 is provided. ) Is fitted into the coupling passage 141 of the second case unit 14 of the cellular phone 10 to be coupled. To this end, the hinge device 20 is inserted into the mounting hole 121 of the first case unit 12 through the coupling passage 141 of the second case unit 14 of the mobile phone 10. This is possible because the rotating member 30 of the hinge device 20 is formed to extend further outward in the radial direction of the rotation axis 100 than the housing 30. In this manner, the hinge device 20 can be more easily mounted on the cellular phone 10.

According to the configuration of the present invention can achieve all the objectives of the present invention described above. Specifically, considering the self-weight of the case unit connected to the hinge device, the part forming the random stop section on the cam surface is slightly inclined so as to rise toward the unfolding side of the mobile phone. Therefore, the external force required to expand or fold the mobile phone in the random stop section The difference is small so that the user can use it more conveniently. In addition, since the hinge device is inserted in through the coupling passage, it can be more easily mounted on the mobile phone.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited thereto. Those skilled in the art will appreciate that modifications and changes can be made without departing from the spirit and scope of the present invention and that such modifications and changes also belong to the present invention.

Claims (9)

In the hinge device that connects the first unit and the second unit that can be folded or unfolded relatively by rotating around the axis of rotation, A rotating member rotatable about the rotation axis; A linear movement member capable of linear movement along the rotation axis; It includes an elastic member for pushing the linear member toward the rotating member, Any one of the rotating member and the linear moving member has a cam surface, the other member has a cam driven protrusion to interact with the cam surface, The cam surface has an arbitrary position stop section in which the cam follower is in a stopped state, wherein the random position stop section is at least partially inclined. 3. The hinge device according to claim 2, wherein the arbitrary position stop section is inclined to move in a direction away from the rotating member when the cam follower is moved to unfold the first and second units. According to claim 2, wherein the cam surface is further provided with an automatic movement section is connected to one end of the arbitrary position stop section and the cam follower is automatically moved without an external force, the automatic movement section is the linear movement member is And a top portion to be located farthest from the rotating member, and two inclined portions inclined downward to both sides of the top portion, wherein one of the two inclined portions is connected to the arbitrary position stop section. The hinge device according to claim 3, wherein the cam surface further includes an insertion groove into which the cam follower is inserted and fixed, and the insertion groove is connected to one end of the arbitrary position stop section. The hinge device according to claim 1, further comprising a housing fixed to the first unit to receive the linearly movable member. 6. The hinge device according to claim 5, wherein the rotating member has a contact surface in contact with the second unit and serves as a key surface, wherein the contact surface is located radially outward of the rotation axis than the housing. In the hinge device that connects the first unit and the second unit that can be folded or unfolded relatively by rotating around the axis of rotation, A housing mounted to the first unit, A rotation member connected to the second unit and rotating about the housing about the rotation axis; And the rotating member has a contact surface in contact with the second unit, and serves as a key surface, wherein the contact surface is provided to be located radially outward of the rotation axis than the housing. The hinge device according to claim 7, wherein the contact surface is continuously formed on the side surface of the rotating member along the circumferential direction of the rotation axis. A mobile telephone using the hinge device according to claim 7 or 8, comprising: a first unit, a second unit, and a hinge device, wherein the housing and the rotating member of the hinge device can pass through at least And a coupling passage portion of which part is in contact with the contact surface of the rotating member, wherein the first unit has a mounting hole into which the housing of the hinge device is inserted and mounted.