CN201696460U - Double hub structure - Google Patents

Abstract

A double-pivot device structure is mainly characterized in that a first pivot device and a second pivot device are connected between a bottom frame connected with a base of a folding electronic product and a bracket connected with an upper cover through a connecting mechanism. The first pivot device is provided with a fixed torsion structure to limit the upper cover to rotate between the 0-degree closing angle and an intermediate angle relative to the base and position the upper cover at any angle between the upper cover and the base; the second pivot device has a light structure of a heavy switch, which provides an opening torque larger than a closing torque to limit the rotation of the upper cover relative to the base between the middle angle and the 180-degree opening angle. The torsion provided by the fixing torsion structure of the first pivot device is approximately equal to the middle value of the opening torsion and the closing torsion of the second pivot device, so that the upper cover of the folding electronic product can be opened to 180 degrees relative to the base and can be smoothly closed.

Description

Double hub structure

technical field

The utility model relates to a double-hinge structure, in particular to a double-hinge structure which enables the upper cover of a foldable electronic product to be opened to 180 degrees relative to the base and laid flat.

Background technique

Currently, due to the enhancement of the touch function of the display screen, there is a trend that the notebook computer has the function of a tablet computer. And the tablet computer is to make the display screen can be placed flat on the desktop and used, for example, it can be used as an e-book.

Under such demands, it is a necessary key component to provide a hinge that can be opened to 180 degrees for foldable electronic products. However, although some traditional single hinges have the function of being able to open to 180 degrees, they cannot be directly used for such a requirement. In particular, in order to prevent the hinge from being opened excessively, there is usually a limit design in the hinge to prevent the hinge from opening to 180 degrees, and this requirement cannot be met. How to design a well-operated hinge structure so that the upper cover and the base of the foldable electronic product can be smoothly opened to 180 degrees is the main topic of the present invention.

In the known Chinese TW New Patent Announcement No. M284191 "Hinge for Light Switching and Heavy Switching", it includes a pivot, and one end of a fixed bracket is bent to form a sleeve. The side edge of the sleeve is not in line with the fixed part. Then a gap is formed, the sleeve is sleeved on the pivot, the inner diameter of the sleeve is smaller than the rod diameter of the pivot, an elastic element group, which is sleeved on the pivot, and a fixing piece, which is sleeved and fixed on the pivot The end of the shaft is used to clamp the position of each component. When the pivot rotates, it rubs against the inner wall of the sleeve to generate torque. When the upper cover is relatively closed to the base, the gap of the fixed bracket is intended to be closed, so that the sleeve produces a resistance. Then the speed of closing is slowed down, and when the upper cover is relatively opened to the base, the gap of the fixed bracket is intended to be restored, so that the sleeve generates a restoring force, which speeds up the opening speed, so the user does not need to apply The extra force utilizes the variation of the torque of the hinge itself to achieve the purpose of controlling the speed when the upper cover is closed or opened. In addition, in the applicant's China TW New Patent Announcement No. M373088 "opening, light, closing, heavy hinge" previous case, an elastic support is mainly arranged on the non-circular pivot extending from the main body; the elastic support has a folded surface, And the two ends of the folded surface are respectively extended to form a connecting surface and a sleeve part; the sleeve part is fitted on the pivot shaft and can be rotated to provide elastic force so that it can be positioned at any angle when it is opened; the sleeve part The barrel part is divided into a first sleeve and a second sleeve, and the first and second sleeves respectively form a first notch and a second notch at the junction with the folded surface, and the first and second notches are respectively Located on different sides of the folding surface; the torque provided by the first sleeve when the upper cover is opened is greater than the torque when it is closed, and the torque zone provided by the second sleeve is greater than the torque zone of the first sleeve segment; through this structure, the action of switching on and off is achieved.

However, the utility model uses this kind of open, light, close, and heavy hinge device to reversely design an open, heavy, and close light hinge, and then match a hinge with a limit function. By combining the two into a double hinge structure, with To achieve the function that the upper cover of the foldable electronic product can be opened to 180 degrees relative to the base and laid flat.

Contents of the invention

Therefore, the purpose of this utility model is to provide a double hinge structure, which can realize the function that the upper cover of the foldable electronic product can be opened to 180 degrees relative to the base and laid flat.

In order to achieve the above purpose, the utility model discloses a double hinge device structure, which is arranged in a foldable electronic device including a top cover with a display screen and a base; it is characterized in that it includes:

a base frame fixedly connected to the base of the foldable electronic device;

A bracket fixedly connected to the upper cover of the foldable electronic device so that the upper cover can rotate relative to the base between a closing angle of 0 degrees and an opening angle of 180 degrees;

A first hinge device, which is arranged on the base frame, has a device that limits the rotation of the upper cover relative to the base from the 0 degree closing angle to an intermediate angle and enables the upper cover to be positioned at any angle therebetween Fixed torsion structure;

A second hinge device, arranged on the bracket, has a function that provides an opening torque greater than a closing torque to limit the upper cover relative to the base to rotate between the middle angle and the 180-degree opening angle and make the upper cover therebetween The opening and closing structure at any angle; and the torque provided by the fixed torsion structure of the first hinge is approximately equal to the middle value of the opening torque and closing torque of the second hinge; and

A connection mechanism is connected between the first hinge device and the second hinge device.

Wherein, the heavy-duty switch-light structure of the second hinge includes:

A second rotating shaft is fixedly connected with the bracket; and

An elastic support frame has a connection surface and a sleeve part that provides a torsion force greater than the torsion force when the upper cover is closed to achieve the action of opening and closing the upper cover; the connection surface is fixedly connected to the connection mechanism; the sleeve The cylinder part fits on the second rotating shaft to be rotatable; the sleeve part is divided to form a first sleeve and a second sleeve, and the first and second sleeves respectively form a The first gap and the second gap.

Wherein, the second rotating shaft is provided with a fan-shaped stopper, and the first sleeve is close to the end surface of the bracket to form a ring that interferes with the two sides of the fan-shaped stopper to limit the rotation angle of the second rotating shaft so that the upper Cover the convex part that rotates between the middle angle and the opening angle of 180 degrees.

Wherein, the fixed torsion structure of the first hinge includes:

A first rotating shaft has a non-circular section, one end is fixedly connected to the connecting mechanism, and passes through a circular perforation on a lug of the chassis;

At least one limiting piece has a non-circular hole through which the first rotating shaft can pass and can rotate together, and its outer edge has two sides which interfere with a stop projection on the protruding piece near the circular perforation respectively a fan-shaped portion that limits the rotation angle of the first rotating shaft to allow the upper cover to rotate between the 0-degree closing angle and the middle angle;

a shrapnel group assembled on the first rotating shaft; and

A fixing device assembled on the other end of the first rotating shaft to make the shrapnel set press the limiting piece and the protruding piece.

Wherein, the limiting plate on the first rotating shaft has two pieces, which are respectively located on both sides of the protruding piece; and the stop projection has two pieces, respectively protruding from the two sides of the protruding piece.

Wherein, the first rotating shaft further has a pair of concave wheels and cams providing automatic closing function.

Wherein, the first rotating shaft further has a friction wheel.

Wherein, the fixed torsion structure of the first hinge includes:

A fixing seat has a joint part, which is connected to the bottom frame; a round hole is formed inside the joint part, and a long groove extends downward at the bottom of the lower edge of the round hole;

A first rotating shaft, which has a connecting portion assembled with the above-mentioned connecting mechanism, and extends a first shaft portion relative to the connecting portion, and the first shaft portion extends into the circular hole of the fixing seat; and

At least one pair of oppositely arranged pipe spring frames, each of which has a ring-shaped fitting part fitted on the surface of the first shaft part, and a ring is formed on the periphery of the ring-shaped fitting part so that the fitting The part produces elastic slots for the covered first shaft part; each of the fitting parts extends downwards with a positioning piece, and each of the positioning pieces is respectively inserted into the long groove of the fixing seat;

Wherein the first shaft portion of the first rotating shaft passes through the fitting portion of the pair of oppositely arranged pipe spring holders so that the fitting portion is used to tightly cover the surface of the first shaft portion so that the first rotating shaft can support the above-mentioned The upper cover can be opened and positioned at any angle with respect to the above-mentioned base.

Wherein, the bottom of the long groove of the fixed base forms a pair of inclined grooves inclined to the direction of the long groove, and an inclined part inclined relative to the positioning piece is formed at the bottom of each positioning piece; the two inclined parts Insert them into the chute respectively.

Wherein, a stop block is provided in front of the joint portion of the fixing base, and a fan-shaped piece is provided on the first shaft to cover the circular hole; The sectors respectively interfere with the stop blocks to limit the rotation of the first rotating shaft between a closed angle of 0 degrees and an intermediate angle.

Through the above-mentioned structure, the double hinge device structure of the present invention uses this kind of open light close heavy hinge device to reversely design an open heavy close light hinge device, and then match a hinge device with a limit function, by combining the two Form a double hinge structure to achieve the function that the upper cover of the foldable electronic product can be opened relative to the base to 180 degrees.

Hereinafter, the structural features and functional effects of the present invention will be described in detail according to the embodiments shown in the drawings.

Description of drawings

Fig. 1 represents the combination diagram of the present utility model,

Fig. 2 represents the exploded view of the utility model,

Figure 3 represents a schematic diagram of the utility model installed in a foldable electronic device, the upper cover and the base are at a closed angle of 0 degrees,

Figure 4 represents a schematic diagram of the utility model installed in a foldable electronic device, the upper cover and the base are at an intermediate angle,

Figure 5 represents a schematic diagram of the utility model installed in a foldable electronic device, the upper cover and the base are located at an opening angle of 180 degrees,

Fig. 6 represents the plane view of the utility model at 0 degree closing angle,

Fig. 6A represents the sectional view of the first hinge device in Fig. 6,

Fig. 7 represents the plan view of the utility model at intermediate angle,

Fig. 7A represents the sectional view of the first hinge device in Fig. 7,

Fig. 7B represents the sectional view of the second hinge device in Fig. 7,

Fig. 8 represents the plane view of the utility model at an opening angle of 180 degrees,

Fig. 8A represents the sectional view of the second hinge device in Fig. 8,

Fig. 9 represents the combined diagram of a further embodiment of the utility model,

Fig. 10 represents the exploded view of a further embodiment of the utility model,

Fig. 11 represents the composite diagram of another embodiment of the utility model,

Fig. 12 represents an exploded view of another embodiment of the present utility model.

Detailed ways

Please refer to Fig. 1 and Fig. 2, which is an embodiment of a double hinge device structure 1 of the present utility model, and the double hinge device structure 1 is arranged on a cover 91 including a display screen and a In the foldable electronic device 9 of the base 92 (see FIGS. 3 to 5 ). The double hinge device structure 1 is mainly composed of a base frame 11 , a bracket 12 , a first hinge device 13 , a second hinge device 14 and a connecting mechanism 15 .

The bottom frame 11 is fixedly connected to the base 92 of the foldable electronic device 9, and the bracket 12 is fixedly connected to the upper cover 91 of the foldable electronic device 9, so that the upper cover 91 can be closed at a 0 degree relative to the base 92 (as shown in FIG. 3 ). shown), an intermediate angle (as shown in Figure 4) and a 180-degree opening angle (as shown in Figure 5).

The first hinge device 13 is arranged on the base frame 11 and has a fixed torsion structure to limit the rotation of the upper cover 91 relative to the base 92 from a closed angle of 0 degrees to an intermediate angle (for example, 135 degrees), and make the upper cover 91 is positioned at any angle therebetween.

The second hinge device 14 is arranged on the bracket 12, has a heavy opening and light closing structure to provide the opening torque greater than the closing torque, so as to limit the rotation of the upper cover 91 relative to the base 92 between the middle angle and the opening angle of 180 degrees, and make the upper Cover 91 is positioned at any angle therebetween. Moreover, the torsion provided by the fixed torsion structure of the first hinge 13 is approximately equal to the middle value of the opening torsion and the closing torsion of the second hinge 14 .

The connecting mechanism 15 is connected between the first hinge device 13 and the second hinge device 14 .

The fixed torsion structure of the first hinge device 13 is mainly formed by a first rotating shaft 131, two stoppers 132, a pair of concave wheels 133 and cam 134 that provide an automatic closing function, a shrapnel group 135, and a fixing device 136. constitute.

The first rotating shaft 131 has a non-circular section, one end is fixedly connected to the connecting mechanism 15 , and passes through a circular hole 112 on a protruding piece 111 of the bottom frame 11 .

The two limiting pieces 132 respectively have a non-circular hole 1321 for the first rotating shaft 131 to pass through and can rotate together, and their outer edges have a fan-shaped part 1322, and the two sides of the fan-shaped part 1322 are respectively connected with the protrusions protruding from the protruding piece 111. A stop protrusion 113 located near the circular through hole 112 on both sides interferes to limit the rotation angle of the first rotating shaft 131 so that the upper cover 91 can rotate between a closed angle of 0 degrees and an intermediate angle. Of course, there can be only one piece of limiting piece 132 , and then there is only one piece of stop projection 113 .

The concave wheel 133 and the cam 134 are arranged on the first rotating shaft 131. The concave wheel 133 is provided with a pair of grooves 133a and a round hole 133b for the first rotating shaft 131 to pass through, while the cam 134 is oppositely provided with a pair of protrusions 134a And for the first rotating shaft 131 to pass through the non-circular hole 134b that can rotate together, by this structure, the first hinge device 13 has an automatic closing function, that is, when the upper cover 91 is closed and close to the base 92, the upper cover 91 Can be automatically closed to the base 92.

In addition, the shrapnel group 135 is assembled on the first rotating shaft 131, and is assembled on the other end of the first rotating shaft 131 with the fixing device 136, so that the shrapnel group 135 compresses the spacer 132, the concave wheel 133, the cam 134 and the protruding piece 111, so that the second A hinge 13 provides a fixed torque.

The heavy switching structure of the second hinge device 14 is mainly composed of a second rotating shaft 141 and an elastic support frame 142 .

The second rotating shaft 141 is fixedly connected with the bracket 12 . The elastic bracket 142 has a connection surface 1421 and a sleeve portion 1422; the connection surface 1421 is fixedly connected to the connection mechanism 15; the sleeve portion 1422 is fit on the second rotating shaft 141 to be rotatable; the sleeve portion 1422 is divided into two parts The first sleeve 1422a and the second sleeve 1422b, the first and second sleeves 1422a and 1422b respectively form a first notch 1422c and a second notch 1422d at the junction with the connection surface 1421; the sleeve part 1422 is on the upper cover 91 The torque provided when opening is greater than the torque when closing, so as to achieve the action of opening heavy and closing light.

In addition, the second rotating shaft 141 of the second hinge 14 is provided with a fan-shaped stop portion 141a, and the first sleeve 1422a forms a convex portion 1422e close to the end surface of the bracket 12; the two sides of the convex portion 1422e and the fan-shaped stop portion 141a The side surfaces interfere to limit the rotation angle of the second rotating shaft 141 so that the upper cover 91 can rotate between a middle angle and an opening angle of 180 degrees.

In the utility model, the torque of the first hinge device 13 is designed at the middle value of the opening torque and the closing torque of the second hinge device 14, for example, the torque of the first hinge device 13 is set to 6kgf/cm, and the second hinge The opening torque of the button 14 is 7kgf/cm and the closing torque is 5kgf/cm. Using such a combination, the following actions can be produced:

1. When the upper cover 91 is opened from a closed angle of 0 degrees relative to the base 92, as shown in Figure 3 and Figure 6, since the opening torque of the second hinge device 14 is 7kgf/cm, the torque of the first hinge device 13 The lighter is 6kgf/cm and will act first, so that the first rotating shaft 131 of the first hinge device 13 rotates (as shown in the direction of arrow G1 in Figure 6) and the upper cover 91 opens to an intermediate angle relative to the base 92 (for example, 135 degrees), as shown in Figure 4 and Figure 7; after that, because the side of the limiting piece 132 sector 1322 of the first hinge device 13 is in contact with the stop bump 113 on the protruding piece 111 (compare Figure 6A and Fig. 7A) and limit the first rotating shaft 131 to rotate again; At this moment, convert into the second pivot device 14 and start acting, make the second rotating shaft 141 drive the support 12 to rotate (as shown in arrow G 2 among Fig. 7), until the upper The cover 91 and the base 92 form an opening angle of 180 degrees, as shown in FIG. 5 and FIG. 8 .

2. Conversely, when the upper cover 91 is closed relative to the base 92 from an opening angle of 180 degrees, since the closing torque of the sleeve part 1422 of the second hinge 14 is 5kgf/cm, it is lighter than the torque of the first hinge 13 6kgf /cm, so the second rotating shaft 141 of the second hinge device 14 first drives the bracket 12 to reverse (as shown by arrow G3 in Figure 8 ) to an intermediate angle, so that the convex part 1422e of the first sleeve 1422a and the sector-shaped stop part 141a stopper (compared with FIG. 8A and FIG. 7B), the first hinge device 13 starts to move until the upper cover 91 is closed on the base 92.

Apparently, the double hinge structure 1 provided by the utility model enables the upper cover 91 of the foldable electronic device 9 with a display screen to be smoothly opened to 180 degrees relative to the base 92, as shown in FIG. Lay flat on a horizontal surface, such as a desktop, and use it as a tablet computer, which is in line with the current trend of using notebook computers and has greatly improved functions.

Furthermore, referring to Fig. 9 and Fig. 10, the double hinge device structure 2 provided for a further embodiment of the present utility model is similar to the foregoing embodiment, and has a bottom frame 21, a bracket 22, a first A hinge device 23 , a second hinge device 24 and a connecting mechanism 25 . The difference is that the first hinge device 23 is a hinge device of a general traditional structure, which is similar to the aforementioned first hinge device 13, and has a first rotating shaft 231, two limit pieces 232, a shrapnel group 235, and a The fixing device 236 does not have the concave wheel 133 and the cam 134 that provide the automatic closing function, but is replaced by a friction wheel 233 .

Furthermore, referring to Fig. 11 and Fig. 12, the double hinge device structure 3 provided by another embodiment of the utility model is similar to the foregoing embodiment, and has a bottom frame 31, a bracket 32, a first A hinge device 33 , a second hinge device 34 and a connecting mechanism 35 . The difference is that the first hinge device 33 is a zinc alloy structure, which is composed of a fixed seat 331 , a first rotating shaft 332 , and at least a pair of oppositely arranged pipe spring frames 333 .

The fixing seat 331 has a joint portion 331a, which is connected to the bottom frame 31; a circular hole 331b is formed inside the joint portion 331a, and a long groove 331c extends downward at the bottom of the circular hole 331b. A pair of inclined grooves 331d inclined to the direction of the long groove 331c are formed at the bottom of the long groove 331c. A stop block 331f is disposed on the front of the joint portion 331a.

The first rotating shaft 332 has a connecting portion 332 a assembled with the connecting mechanism 35 , and a first shaft portion 332 b extends opposite to the connecting portion 332 a, and the first shaft portion 332 b extends into the circular hole 331 b of the fixing seat 331 . The first shaft portion 332b is provided with a fan-shaped piece 332c to cover the circular hole 331b; the fan-shaped piece 332c has an outwardly protruding fan-shaped portion 332d. When the first rotating shaft 332 rotates, the two sides of the fan-shaped portion 332d interfere with the stopper 331f respectively, so as to limit the rotation of the first rotating shaft 332 between a closed angle of 0 degrees and a middle angle.

A pair of oppositely arranged pipe spring holders 333, each pipe spring holder 333 has an annular fitting portion 333a fitted on the surface of the first shaft portion 332b, and a cut groove is formed on the periphery of the annular fitting portion 333a 333b makes the fitting portion 333a produce elasticity to the covered first shaft portion 332b; each fitting portion 333a extends downward a positioning piece 333c, and each positioning piece 333c is inserted into the long groove 331c of the fixing seat 331 respectively; The bottom of each positioning piece 333c forms an inclined portion 333d inclined relative to the positioning piece 333c; the two inclined portions 333d are respectively inserted into the chute 331d to form a supporting function.

The first shaft portion 332b of the first rotating shaft 332 passes through the fitting portion 333a of the pair of oppositely disposed pipe spring holders 333, and the fitting portion 333a is used to tightly cover the surface of the first shaft portion 332b, so that the first rotating shaft 332 The upper cover 91 can be supported to be opened and positioned at any angle relative to the base 92 .

In summary, the utility model fully complies with the novelty and progressive requirements of the patent, and an application is filed according to law. It is to be declared that the drawings shown are only preferred embodiments of the utility model, and do not limit the scope of patent protection of the utility model, but any simple or equivalent changes based on the technical ideas of the utility model are still Among the utility model patent scope.

Claims (10)

1. two pivot structure is arranged at and comprises one and have in the folding-type electronic device of the loam cake of a display screen and a base; It is characterized in that comprising:

One underframe is fixedly connected on the base of this folding-type electronic device;

One is fixedly connected on the loam cake of this folding-type electronic device so that this loam cake support of rotating between the opening angles at the one 0 closed angles of degree and one 180 degree of this base relatively;

One first pivot is arranged on this underframe, have limit this loam cake can be with respect to the rotation and make this loam cake fixedly torsion structure of unspecified angle location betwixt between closed angle to an intermediate angle of this 0 degree of this base;

One second pivot, be arranged on this support, have one provide open torsion greater than closed torsion with limit this loam cake with respect to this base this intermediate angle to rotation between this 180 degree opening angle and make this loam cake betwixt the unspecified angle location open the series of fortified passes light structure; And the torsion that the fixedly torsion structure of this first pivot is provided approximates the unlatching torsion of this second pivot and the intermediate value of closed torsion; And

One bindiny mechanism is connected between this first pivot and second pivot.

2. according to described pair of pivot structure of claim 1, it is characterized in that, this second pivot open the series of fortified passes light structure, comprising:

One second rotating shaft, fixedly connected with this support; And

One elasticity bolster, torsion was to reach out the sleeve part of the light action in series of fortified passes when a junction surface and a torsion that is provided when this loam cake is opened were provided greater than closure; This junction surface is fixed in this bindiny mechanism; This sleeve part is sleeved in this second rotating shaft and turns; This sleeve part is also cut apart formation first sleeve and second sleeve, and this first and second sleeve is forming one first breach and second breach respectively with this position, junction surface boundary.

3. according to described pair of pivot structure of claim 2, it is characterized in that, this second rotating shaft is provided with a fan-shaped blocked part, thereby and this first sleeve forms one near this bracket end face and makes this loam cake 180 spend the protuberance that rotates between opening angle in this intermediate angle to this with the bi-side interference of this fan-shaped blocked part with the angle of swing that limits this second rotating shaft.

4. according to described pair of pivot structure of claim 3, it is characterized in that the fixedly torsion structure of this first pivot comprises:

One first rotating shaft has non-circular profiles, and an end is fixedlyed connected with this bindiny mechanism, and passes the circular perforations on the lug of this underframe;

At least one banking stop, have a non-circular hole and pass and can together rotate for this first rotating shaft, its outer rim have bi-side respectively and on this lug near the backstop projection interference this circular perforations make to limit this first rotating shaft angle of swing this loam cake in the closed angle of this 0 degree to the sector part of rotating between this intermediate angle;

One shell fragment group is assembled in this first rotating shaft; And

One is assembled in the other end of this first rotating shaft so that this shell fragment group is oppressed the fixing device of this banking stop and this lug.

5. according to described pair of pivot structure of claim 4, it is characterized in that the banking stop in this first rotating shaft has two, the position is in the both sides of this lug respectively; And this backstop projection has two, protrudes in the both side surface of this lug respectively.

6. according to described pair of pivot structure of claim 4, it is characterized in that a pair of the recessed of auto-closing function that provide further being provided in this first rotating shaft taking turns and cam.

7. according to described pair of pivot structure of claim 4, it is characterized in that further having a friction wheel in this first rotating shaft.

8. according to described pair of pivot structure of claim 4, it is characterized in that the fixedly torsion structure of this first pivot comprises:

One fixed base has a connecting part, and this connecting part connects this underframe; This connecting part is inner to form a circular hole, and extends an elongated slot downwards at this circular hole lower edge bottom position;

One first rotating shaft have a linking department and the winding of above-mentioned bindiny mechanism, and this joint is extended a first axle part relatively, and this first axle part stretches in the circular hole of this fixed base; And

Spoon rack that at least one pair of oppositely is provided with, each this spoon rack have a ring-type fit portion that is sleeved on this first axle part surface, form in the periphery of this ring-type fit portion to make this fit portion that this first axle part that is coated is produced flexible grooving together; Each this fit portion extends a location piece downwards, and each this location piece is inserted in respectively in the elongated slot of this fixed base;

Wherein thereby the first axle part of this first rotating shaft passes the surface that utilizes this urgent this first axle part of coating of fit portion in this fit portion to the spoon rack of reverse setting and above-mentioned base is opened on unspecified angle and is located so that this first rotating shaft can be supported above-mentioned loam cake.

9. according to described pair of pivot structure of claim 8, it is characterized in that a pair of skewed slot with this elongated slot direction inclination is formed on the elongated slot bottom of this fixed base, and form the squint portion of relative this location piece squint in the bottom of each this location piece respectively; This two squints portion is inserted in respectively in this skewed slot.

10. according to described pair of pivot structure of claim 8, it is characterized in that the front, connecting part of this fixed base is provided with a stop block, and this first axle part is provided with a fanning strip with this circular hole of capping; That this fanning strip has an evagination and bi-side when this first rotating shaft rotation respectively and this stop block interference with limit this first rotating shaft in the closed angle of 0 degree to the sector part of rotating between the intermediate angle.

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