JP2001193727A - Hinge device for retaining collapsible equipment in opened/closed state - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the defect of conventional products having numerous constituent members assembled by completing a hinge device capable of retaining a cover in the closed/opened state in device bodies such as a portable telephone only by engaging and fitting a previously composed engagement fit composition. SOLUTION: This hinge device for retaining collapsible equipment in opened/ closed state consists of a first hinge cylinder 10 fixed to a first member A, and a second hinge cylinder 11 which is fixed to a second member B and communicated with the first hinge cylinder 10. A plurality of requisite members constituted such that the second member B can be retained in a free position with respect to the first member A at the closed state and at the specified open angle are housed in the first and second hinge cylinders 10, 11. The requisite members are integrally formed so as to constitute an engagement fit composition C. The engagement fit composition C is engaged in the first and second hinge cylinders 10, 11, so as to be freely engaged and fitted keeping the undetachable state, thereby easily and rapidly constituting the hinge device for retaining collapsible equipment in opened/closed state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a folding computer,
In a folding device such as a personal computer, a mobile phone, and a word processor, a cover pivotally attached to the device body so as to be freely opened and closed can be maintained at a closed position and at an arbitrary opening angle. The present invention relates to a hinge device capable of holding and opening and closing a wide angle of a cover of a foldable device which can smoothly open and close the cover by releasing the holding state with an appropriate force.

[0002]

2. Description of the Related Art In portable telephones and the like described above, it is possible to prevent a cover that closes a device body from being unintentionally opened or from being closed during use. However, when using conventional locking means using locking claws or magnets, satisfactory results are not obtained in various aspects such as design, mounting restrictions, high cost and operability. Therefore, in order to resolve the defect, Japanese Patent Laid-Open No.
A proposal described in Japanese Patent Publication No. 11831 is made.

[0003] The above-mentioned proposal has a configuration as described below with reference to Figs. That is, as understood from FIG. 7 and FIG.
Are hinged by a hinge 3 so as to be freely openable and closable by an arbitrary opening angle α ゜, and the hinge 3 is composed of a main body hinge tube 1 a fixed to the device main body 1 and a cover hinge tube 2 a fixed to the cover 2.
As shown in FIG. 8, the main body contact end surface 1b of the main body hinge tube 1a and the cover contact end surface 2b of the cover hinge tube 2a are freely slidable when the cover 2 is opened and closed.

A fixed disk 4 is fitted in the main body hinge tube 1a so as to be slidable in the axial direction in a rotation stopped state. For this purpose, a guide rib 1c provided on the inner peripheral surface of the main body hinge tube 1a is fitted. The guide groove 4a of the fixed disk 4 is engaged. On the other hand, the movable disk 5 is also fitted into the cover hinge cylinder 2a while the rotation is stopped. For this reason, in the illustrated example, the rib 5a formed on the end face of the movable disk 5 is formed in the groove 2c on the inner surface of the cover hinge cylinder 2a. Is engaged.

Further, in the prior art, one of the fixed butted end face 4b of the fixed disk 4 and the movable butted end face 5b of the movable disc 5, in the illustrated example, is fixed to the fixed butted end face 4b in FIG. As can be understood from FIG. 10C and FIG. 10, a plurality of (three) engagement recesses 6 are provided at predetermined circumferential angular positions N1, N2, and N3 (positions determined by the opening angle α ゜ of the cover 2). As shown in FIGS. 9 (B), 9 (D) and 10 in the illustrated example, the engaging recess 6 is engaged by the elastic force based on the coil spring 7 in FIG. A plurality of (two) engaging projections 8 are formed at predetermined circumferential angle positions P1, P2.
And protrudes from the movable butting end face 5b.

Here, the above coil spring 7 is shown in FIG.
As shown in FIG. 2, the screw rod is located on the opposite side of the fixed butted end face 4b of the fixed disk 4 and is housed in the storage cavity 4c opened outward, and is inserted from the outside of the main body hinge cylinder 1a. The screw 9 penetrates through the fixed disk 4 and the movable disk 5 from the coil spring 7, and the tip 9a of the screw is screwed into a screw hole 2e formed in the bottom 2d of the cover hinge cylinder 2a. Here, 9b in the figure
Indicates the head of the screw 9. Therefore, the coil spring 7 elastically presses the fixed disk 4 toward the movable disk 5 by the elastic force, and thereby the engagement convex portion 8 is engaged with the engagement recess 6.
Are engaged, the fixed butted end face 4b comes into pressure contact with the movable butted end face 5b.

Therefore, as can be understood from FIG. 10, when the cover 2 is opened to move the movable disk 5 together with the cover hinge cylinder 2a, the movable butted end face 5
9E, the engaging projection 8 protrudes from the engaging recess 6 in the circumferential direction as shown in FIG. 9 (E). However, FIG.
Is moved to the left, and the tip of the engaging projection 8 is
It slides on the fixed butted end face 4b and rotates in the circumferential direction.

For this reason, in FIG. 9, when the engaging projection 8 at the circumferential angular positions P1 and P2 of the movable disk 5 is in the closed state of the cover 2, the circumferential angular position N1 and
When the cover 2 is opened by the opening angle α ゜, the pair of engaging projections 8 are engaged with the circumferential angles N3 and N1, respectively. The engagement can be switched to the engagement recess 6 at the position.

[0009] With the above-described configuration, in the case of the related art, compared with locking by a locking claw or a magnet,
When the cover 2 is closed and opened with respect to the device body 1,
It is possible to prevent unintentional rotation, and it is possible to easily open and close the cover 2 as needed, thereby greatly improving the defects of the above-mentioned conventional cases.

[0010]

As described above, a desired effect can be obtained when the above-described conventional hinge device is used. However, as understood from FIG. The movable disk 5 is engaged with the cover hinge cylinder 2a, and the respective grooves 2c and the ribs 5a are engaged with each other. On the other hand, the fixed disk 4 is fitted into the main body hinge cylinder 1a of the device main body 1, and The guide groove 4a is engaged with the guide rib 1c. Further, after the coil spring 7 is fitted on the fixed disk 4, the screw 9 is inserted through the coil spring 7 and the screw 9a of the screw 9 is screwed into the screw hole 2e formed in the bottom 2d of the cover hinge cylinder 2a. By attaching, the head 9b of the screw rod 9 causes the coil spring 7
The fixed disk 4 is pressed by the elastic force generated by the compression of the movable disk 5, whereby the fixed butted end face 4b is pressed against the movable butted end face 5b of the movable disk 5.

The present invention is intended to solve the above-mentioned deficiencies, and according to the first aspect, the first hinge tube of the first member and the second hinge tube of the second member are arranged so as to be in communication. And the first and second hinge cylinders as in the conventional example,
At the time of closing the second member with respect to the first member and at a predetermined opening angle while sequentially loading the required members, the above-mentioned required members are not previously assembled so that the respective states can be freely held. An integrally formed engagement composition is prepared, and the engagement composition is engaged with the first hinge cylinder so as to be in a state of being prevented from coming off, thereby obtaining a finished product. It is an object of the present invention to dramatically improve the workability of assembling the hinge for holding the opening / closing of this type of folding device.

According to the second aspect, the first aspect is provided.
The required members of the engaging composition in the above are constituted by the first and second disks, the coil springs in the interior of the first disk, and the shaft rod that penetrates them and prevents them from coming off. In addition to simplifying the configuration of the first embodiment, the retaining operation of the second disk facilitates the engaging operation of the engaging composition with the first and second hinge cylinders and ensures the reliability of the engaging state. .

According to the third aspect of the present invention, the second (movable) disk, sliding disk, coil spring and the first (fixed) disk which are sequentially mounted are fixed in a state where they are prevented from falling off. As a result, the sliding disk is elastically contacted with the second (movable) disk by the elastic force of the coil spring, and the sliding disk that is moved in the axial direction when the second member (cover) opens and closes is moved. The engaging composition to be provided is configured in advance. Then, the engagement composition body is fitted only in the communication state between the first hinge tube of the first member (device main body) and the second hinge tube of the second member (cover), and the first and second hinges are provided. The engagement member fitted to the cylinder locks the second disk to the second hinge cylinder in a retaining state, so that the first member and the second member can be freely opened and closed. It is an object of the present invention to ensure a pivotal state and thus to greatly improve the workability of assembling the hinge for opening and closing the folding device.

[0014]

In order to achieve the above object, according to the present invention, a first hinge cylinder fixed to a first member and a second hinge tube fixed to a second member are provided. A second hinge cylinder communicating with the one hinge cylinder, wherein the first and second hinge cylinders have a second member with respect to the first member at a predetermined closing angle and at a predetermined opening angle, respectively. In a hinge device for opening / closing and holding a foldable device provided with a plurality of required members configured to be able to hold the state described above, an engaging composition is formed by integrally forming the plurality of required members. And, by fitting the engaging composition from the first hinge cylinder to the second hinge cylinder, the engaging composition is engaged so as to be in a retaining state. Attempts to provide hinge devices.

According to a second aspect of the present invention, there is provided the hinge device for holding the opening and closing of the foldable device according to the first aspect, wherein the first and second hinge cylinders are respectively fitted in the first and second hinge cylinders in a stopped state. An engaging composition formed integrally with a second disk, a coil spring contained in the first disk, and a shaft rod that penetrates these members and fixes them in a retaining state is integrally formed. And by engaging said engaging composition from said first hinge cylinder to said second hinge cylinder, said second engaging cylinder is engaged with said second hinge cylinder so as to be in a state of being prevented from falling off by said retaining claw of said second disk. It is an object of the present invention to provide a hinge device for holding an opening and closing of a foldable device.

Further, according to the third aspect, a first hinge cylinder fixed to the first member and a second hinge cylinder facing the first end peripheral edge thereof.
A second hinge cylinder fixed to the second member having an end periphery, wherein the first disk has a first disk in a rotation-stopped state, and the second hinge cylinder has a second disk in a rotation-stopped state. Each of the two disks is internally fitted, and a plurality of engagement recesses are provided at one of the first butting end surface of the first disk and the second butting end surface of the second disk at a predetermined circumferential angle position, and Is provided with a plurality of engaging projections which engage with the engaging recesses by the elastic force of the coil spring, and when the first and second members are closed and opened, the engaging projections of the engaging projections are provided. In the hinge device which is adapted to switch the engagement of the other engagement recesses,
The first disk includes a cylindrical main body and a sliding disk slidable in the axial direction. The sliding disk is provided with the engaging projection or the engaging recess,
The disk is provided with retaining elastic claws, and the loaded shaft is fixed to the cylindrical body of the second disk, the sliding disk, the coil spring and the first disk which are sequentially arranged in the state of being retained. By engaging the engaging composition constituted by elastically contacting the sliding disk by the elastic force of the coil spring from the first hinge cylinder to the second hinge cylinder, An open / close holding hinge device for a foldable device, wherein a retaining elastic claw is engageable with the second hinge cylinder.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the present invention will be described with reference to FIG. 1A. In the first embodiment, a first hinge cylinder 10 fixed to a first member A of a foldable device and a first hinge cylinder 10 are provided. A second hinge cylinder 1 having a second end periphery 11a facing the end periphery 10a and fixed to a second member B of the folding device.
In the first and second hinge cylinders 10 and 11, when the second member B is closed with respect to the first member A and at a predetermined opening angle, the respective states are set. The present invention relates to a hinge device for opening / closing and holding a foldable device provided with required members configured to be freely held, and this point is the same as the conventional example described above. In the present invention, in the hinge device for holding the opening and closing as described above, the above-mentioned required members are integrally formed to form the engaging composition C in advance, and this is shown by a virtual line in FIG. As described above, not only the first hinge cylinder 10 is fitted to the second hinge cylinder 11 but also the engagement is performed by the fitting so as to prevent the second hinge cylinder 11 from coming off.

The second aspect of the present invention differs from the first aspect in that the required members constituting the engaging composition C are specified. That is, the contents are the first and second discs 12 and 13 which are respectively fitted in the first and second hinge cylinders 10 and 11 in a rotation stopped state.
And a coil spring 1 mounted on the first disk 12.
4 and a shaft 15 which penetrates these members and is fixed in a retaining state so that the members are integrally formed, whereby the second member B according to claim 1 is formed.
Can be more reliably performed. Further, the second difference is that the engaging means of the engaging composition C to the first and second hinge cylinders 10 and 11 in claim 1 is different from the first hinge cylinder 10 to the second hinge cylinder 11.
It has been specified that the second engaging means 13 can be prevented from falling off by the retaining claw 13C of the second disk 13 by being fitted to the second disc 13. And trying to ensure reliability.

As will be described in more detail with reference to claim 3, as can be understood from FIG. 1A, a first hinge cylinder 10 protruding from one end edge of the first member A of the foldable device is provided. A second hinge tube 11 protrudingly provided at one edge of the second member B, and an engaging composition C which is fitted and locked in the first hinge tube 10 and the second hinge tube 11. It is configured. Here, in the illustrated example, the first member A is the device main body, and the second member B is a cover that can be freely opened and closed with respect to the device main body. The second member B may be specified as the device body.

The above-mentioned first hinge tube 10 and second hinge tube 1
1 is on the same axis as is known, the first contact end peripheral edge 10a of the first hinge cylinder 10 and the second contact end peripheral edge 11a of the second hinge cylinder 11 are opposed to each other. As shown in FIG.
(C), as understood from FIGS. 2 and 3, the first disc 12 of the engaging composition C is internally fitted in the rotation stopped state,
The second discs 13 of the engaging composition C are also fitted in the hinge cylinder 11 in a rotation stopped state. Further, similarly to the conventional example, an engaging recess 13b is provided at a predetermined circumferential angle position on one of the first butting end face 12a of the first disc 12 and the second butting end face 13a of the second disc 13. A plurality of engagement projections 12b are provided on the other, and the engagement engagement recesses 13b are engaged with the engagement engagement recesses 13b by the elastic force of the coil spring 14. When the first and second members A and B are closed, At the time of opening, the engagement of the engagement projection 12b with the engagement recess 13b is performed by the other engagement recesses 1
3b relates to a hinge device for switching to 3b.

According to the present invention, in the hinge device as described above, the first disk 12 is fitted in the cylindrical main body 12A and the slide groove 12d formed in the side edge 12c, and is slidable in the axial direction. The sliding disk 12B is provided with the engaging protrusion 12b as shown in the figure or the engaging recess 13b (not shown), and the second disk 13B as shown in FIG. Is provided with a retaining elastic claw 13c. Further, in the engaging composition c according to the present invention, the second disc 13
The first disk 12 penetrates through the sliding disk 12B and the coil spring 14, and further the first disk 1
2 by fixing the shaft rod 15 inserted in the cylindrical main body 12A in a retaining state, and by the elasticity of the coil spring 14, the sliding disk 12B
The first butted end face 12a of the second disk 13
Is brought into elastic contact with the second abutting end face 13a.

By the above-mentioned elastic contact, a separation space S between the sliding disk 12B and the rear end edge 12e of the sliding groove 12d having a length equal to or longer than that of the engaging projection 12b is formed as shown in FIG.
By being formed as explicitly shown in (B), the engaging composition C described so far is constituted. Here, in the above description of the configuration, the first hinge cylinder 1
In the illustrated example, the cylindrical main body 12A is engaged with the guide rib 10b axially opposed to the inner peripheral surface of the first hinge cylinder 10 in order to fit the cylindrical main body 12A to the inner peripheral surface of the first hinge cylinder 10.
A guide groove 12f opposed in the axial direction is engaged with the outer peripheral surface of the shaft. For other configurations,
The following embodiments are desirable.

More specifically, as to the shaft 15 in detail, the second disk 13, the sliding disk 12B, the coil spring 14, and the cylindrical body 12A of the first disk 12 are integrally mounted on the shaft. In the example shown in the figure, the base portion 15b is provided with a detent base portion 15b connected to the head portion 15a, a rod portion 15c connected to the head portion 15a, and a thin tip portion 15d connected to the rod portion 15c. 15c
Is formed with a front end receiving edge 15e. The above-described detent base end 15b is fitted into a detent shaft hole 13d penetrating through the second disk 13 so that the second member B can be opened and closed together with the second hinge cylinder 11 when the second member B is opened and closed. The second disk 13 also rotates. At this time, in the illustrated example, the detent base end portion 15b and the detent shaft hole 13d are formed in a rectangular shape.

Further, a washer 16 is fitted on the thin end portion 15d of the shaft 15 in contact with the edge of the cylindrical body 12A of the first disk 12, and a terminal of the thin end portion 15d is fitted. By caulking, the washer 16 is pressed and fixed to the above-mentioned front end receiving edge 15e of the rod portion 15c.

Next, as shown in FIG. 1 to FIG. 3, the second disc 13 has the engagement recess 13b or the engagement protrusion 12b.
And an elastic claw portion 13B protruding from the substrate portion 13A.
A pair of variable arms 13e is provided with a tapered tapered surface 13f so as to protrude therefrom.
The retaining elastic claw 13c described above is formed on the base end side of 3f. In the second disk 13 shown in FIG. 6, four variable arms 13e are protruded, and the elastic claws 13B are formed in a square shape, whereas the elastic claws 13B are formed in a split tube shape. ing.

In the illustrated example, the second hinge cylinder 11
In addition, a square anti-rotation cylinder shaft opening 11b is opened in the side wall 11c, and the second disk 13 is mounted on the second hinge cylinder 11 by the fitting operation of the engaging composition c as described above. Then, the tapered tapered surface 13 of the second disk 13
When the variable arm 13e having the diameter f is reduced in diameter, the variable arm 13e is fitted into the detent cylinder shaft opening 11b and goes through to return to the reduced diameter state, thereby restoring the elastic claw 13c.
Is locked to the outer wall surface of the side wall 11c. Therefore, according to the illustrated example, the substrate portion 13A is used.
And the stopper claw 13c of the elastic claw portion 13B, the stopper perimeter protruding from the side wall 11c of the second hinge cylinder 11 toward the axial center, and the opening of the rotation stopper cylinder shaft opening 11b being opened. 11d is sandwiched, so that the engaging composition c can be reliably housed without falling off over the first hinge tube 10 and the second hinge tube 11 which are connected in series.

Therefore, in the illustrated example, the second member A is replaced with the first member B.
, The second disk 13 is rotated together with the rotation of the second hinge cylinder 11 in the same manner as in the above-described conventional example, whereby the engagement state is prevented against the elasticity of the coil spring 14. Engagement recess 13b and engagement protrusion 12b
Is disengaged, the engaging projection 12b slides on the second butted end face 13a of the second disk 13, and at this time, the sliding disk 12B moves to the right in FIG. The movement of the second member B is switched from the holding state of the closed state to the holding position of the opened state without any trouble by the setting of the separation space S.

In the illustrated example, the side surface of the cylindrical main body 12A of the first disk 12 of the engaging composition C is closed by the closing cap 17 so as to improve the external appearance. Dust is prevented from entering the engaging composition C. As shown in FIG. 3, the closing cap 17 is, as can be understood from FIG. 3, located between the outer plate portion 17a and the inner locking plate portion 17b so as to open the engaging hole 17c to the side. A place 17d is formed apart. Then, the washer 16 in the engaging composition C described above is housed in the engaging cavity 17d from the engaging hole 17e, and the closing cap 17 is opened and operated from this state, so that the inside of the washer 16 is The locking plate portion 17b is engaged with the retaining plate 17b in a retaining state.

[0029]

According to the first aspect of the present invention, since the present invention is configured as described above, the first and second hinge cylinders can be fitted to the first and second hinge cylinders by appropriately integrating the engaging composition. The hinge for opening and closing and holding of the folding device can be immediately constructed by the operation of merely engaging, so that it is not necessary to assemble a large number of parts individually, and the assembling of the engaging composition can be performed with various parts. A simple and quick configuration can be achieved by an operation of inserting a shaft rod into the shaft and caulking. In addition, according to the second aspect, the required members relating to the engaging composition in the first aspect are replaced with the first and second members.
Since the disc, the coil spring and the shaft are specified, the object of claim 1 can be achieved with a small number of members. According to a third aspect of the present invention, the first disk is constituted by a cylindrical main body and a sliding disk, and the arrangement of the first and second disks and the coil springs is specified. Since the sliding disk is moved in the axial direction by the opening and closing movement of the second member with respect to the first member, it is possible to reliably achieve the objects of the first and second aspects.

[Brief description of the drawings]

1 shows a hinge device for opening and closing a folding device according to the present invention, wherein (A) is an exploded schematic perspective view showing one embodiment thereof, (B) is a vertical sectional front view when the assembly is completed, (C) is an end elevation showing the second hinge cylinder at the completion of the assembly.

FIG. 2 is a cross-sectional plan view when the assembly according to FIG. 1B is completed.

FIG. 3 is an exploded perspective view showing the engaging assembly according to the present invention.

4A and 4B show a second disk which is a part of the engaging composition according to the present invention, wherein FIG. 4A is a front view, FIG. 4B is a right side view, and FIG. ) Is a top view thereof.

5A and 5B show a sliding disk which is a part of the engaging composition according to the present invention, wherein FIG. 5A is a front view, FIG. 5B is a right side view, and FIG. ) Is a top view thereof.

FIG. 6 is a perspective view showing another embodiment of the second disk according to the present invention.

FIG. 7 is a perspective view showing an open state of a conventional foldable device.

FIG. 8 is an exploded perspective view showing a main part of FIG. 7;

9A is a fixed butt end view of a fixed disk which is a constituent member of FIG. 8, FIG. 9B is a movable butt end view showing a movable disk, and FIG. 9C is a cross-sectional view taken along line CC of FIG. 9A. , (D) is a sectional view taken along line DD of (B), and (E) is (C).
FIG. 6 is a longitudinal sectional view showing the fixed disk and the movable disk of FIG.

FIG. 10 is a vertical sectional front view showing a conventional hinge device using the components shown in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 1st hinge cylinder 10a 1st contact end peripheral edge 11 2nd hinge cylinder 11a 2nd contact end peripheral edge 12 1st disk 12A Tubular main body 12B Sliding disk 12a 1st butting end surface 12b Engagement convex part 13 2nd disk 13a Second butted end face 13b Engagement recess 13c Retaining elastic claw 13 Retaining elastic claw 14 Coil spring 15 Shaft A A First member B Second member C Engagement composition

Claims (3)

[Claims] A first hinge cylinder fixed to the first member and a second hinge cylinder fixed to the second member and communicated with the first hinge cylinder, wherein the first and second hinge cylinders are provided in the first and second hinge cylinders; Is a foldable device provided with a plurality of required members configured to be able to hold respective states when the second member is closed with respect to the first member and at a predetermined opening angle. In the hinge device for holding the opening and closing described above, an engaging composition is formed by integrally forming the plurality of required members, and the engaging composition is fitted from the first hinge cylinder to the second hinge cylinder. A hinge device for opening and closing the folding device, wherein the hinge device is engaged so as to be in a retaining state. 2. A first hinge tube fixed to a first member and a second hinge tube fixed to a second member and communicated with the first hinge tube, wherein the first and second hinge tubes are provided in the first and second hinge tubes. Is a foldable device provided with a plurality of required members configured to be able to hold respective states when the second member is closed with respect to the first member and at a predetermined opening angle. In the hinge device for opening / closing and holding, the first and second disks which are respectively fitted in the first and second hinge cylinders in a rotation-stopped state, the coil springs inside the first disk, and the respective members are penetrated. And a required engaging member formed integrally with the shaft rod fixed in the retaining state is formed, and the engaging composition is fitted from the first hinge cylinder to the second hinge cylinder. By mounting the second disc, the second disc is prevented from coming off by the resilient pawls. A hinge device for holding open / close of a foldable device, wherein the hinge device is engaged. 3. A first hinge cylinder fixed to the first member, and a second hinge cylinder fixed to the second member having a second end periphery opposed to the first end periphery thereof, The first disk is fitted in the first hinge cylinder in a rotation stopped state, and the second disk is fitted in the second hinge cylinder in a rotation stopped state. The first butted end face of the first disk and the second disk are fitted in the second hinge cylinder. (2) A plurality of engagement recesses are provided at any one of the butted end surfaces at predetermined circumferential angular positions, and the other engagement engagement portions are engaged with the engagement recesses by elasticity of a coil spring. In a hinge device, a projection is provided, and when the first and second members are closed and opened, engagement of the engagement projection with the engagement recess is switched to another engagement recess. The first disk comprises a cylindrical main body and a sliding disk slidable in the axial direction. The disk is provided with the engaging projection or the engaging recess, and the second disk is provided with a retaining elastic claw. The second disk, the sliding disk, the coil spring and the first The engaging composition constituted by fixing the shaft rod inserted into the cylindrical body of the disc in a retaining state so as to resiliently contact the sliding disc by the elastic force of the coil spring is used as the first composition. An open / close holding hinge device for a foldable device, wherein the retaining elastic claw of the second disk can be engaged with the second hinge cylinder by engaging the hinge cylinder with the second hinge cylinder.