CN104482037A - Rotary shaft device and folding electronic device with same - Google Patents

The invention discloses a rotary shaft device and a folding electronic device with same. The rotary shaft device comprises a bearing part, a first rotary connector, a second rotary connector, a friction mechanism and a holding mechanism, wherein the first rotary connector comprises a first rotary shaft and a first bracket, the first rotary shaft is pivotally connected to the bearing part, the first bracket is fixedly connected to the first rotary shaft; the second rotary connector comprises a second rotary shaft and a second bracket, wherein the second rotary shaft is pivotally connected to the bearing part and opposite to the first rotary shaft; the second bracket is fixedly connected to the second rotary shaft; the friction mechanism is used for providing friction force for rotating the first rotary shaft and the second rotary shaft; the holding mechanism can be used for keeping the first bracket and the second bracket in an open state. The rotary shaft device has relatively great rotary friction force, good rotary connecting effects, long service life, and stability and firmness in connection; the friction force is almost not damped after long-term use.

Turning gear and there is the Foldable electronic device of this turning gear

Technical field

The present invention relates to turning gear, particularly relate to a kind of turning gear and there is the Foldable electronic device of this turning gear.

Background technique

In the current information age, people grow with each passing day for the dependence of electronic product.The high speed of electronic product, high-effect and lightening requirement, such as, be that the folding electronic products such as notebook computer gradually become main flow now, and become instrument indispensable in modern's life.In general, Foldable electronic device adopts folding mode to reduce storage area, to reach the compact object of electronic product.

Turning gear is used in Foldable electronic device two of electronic product main bodys to be opened or closed bindiny mechanism.Such as take down notes computer and mainly comprise display device and main frame body, wherein display device and main frame body are normally interconnected by turning gear.So, when user's closure or openness Foldable electronic device period of the day from 11 p.m. to 1 a.m, namely display device and main frame body mutually rotate by turning gear and realize closure or openness.But, need to keep open configuration after display device and main frame body are opened, therefore, this just requires that turning gear will have larger rotation friction, but, current folding electronic product, the frictional force that its turning gear rotates is less, and the reliability that electronic product uses is poor, in addition, after using a period of time, frictional force is less gradually, causes electronic product normally not use.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art and a kind of turning gear be provided and there is the Foldable electronic device of this turning gear.

The present invention solves the technological scheme that prior art problem adopts: a kind of turning gear,

Supporting;

First rotating connector, comprises the first rotating shaft and the first support, and described first rotating shaft is connected to described supporting pivotly, and described first support is fixedly connected on described first rotating shaft;

Second rotating connector, comprises the second rotating shaft and the second support, and described second rotating shaft is connected to described supporting and relative with described first rotating shaft pivotly, and described second support is fixedly connected on described second rotating shaft;

Friction mechanism, comprise the first driving gear, the second driving gear and at least one driven gear, described first driving gear is fixedly arranged in described first rotating shaft, described second driving gear is fixedly arranged in described second rotating shaft, and at least one driven gear described pivotable can be arranged on described supporting and to engage respectively with described first driving gear and the second driving gear;

Retaining mechanism, comprises sleeve, sliding sleeve and elastic damping mechanism, and described jacket casing is connected on described second rotating shaft and fixes with described supporting circumference, and the circumferential surface of described sleeve is provided with spiral slideway; Described sliding sleeve can be sheathed on described second support slidably along the direction being parallel to described second rotating shaft, and described sliding sleeve is provided with the projection inserted in described spiral slideway, and during to make described second holder pivots, described sliding sleeve is relative to described second bracket slide; Described elastic damping mechanism is connected between described sliding sleeve and described second support, resistance when sliding to provide described sliding sleeve.

Preferably, described elastic damping mechanism comprises spring and STATEMENT OF FEDERALLY SPONSORED, and described STATEMENT OF FEDERALLY SPONSORED comprises centerbody and the first cursor of extending to form from described centerbody and the second cursor had angle with described first cursor shape;

Described centerbody can be pivotally connected to described second support, described second support is provided with the first chute and the second chute, the free end of described first cursor is equipped with the first bearing pin, described first bearing pin is slidably disposed in described first chute, the free end of described second cursor is equipped with the second bearing pin, and described second bearing pin is slidably disposed in described second chute;

One end of described spring is fixedly connected with the free end of described first cursor, the other end of described spring and being fixedly connected with of described sliding sleeve.

Preferably, described driven gear comprises the first driven gear and the second driven gear, and described first driven gear engages with described first driving gear and the second driven gear, and described second driven gear engages with described second driving gear.

Preferably, described supporting comprises the first bearing plate and the second bearing plate, described first rotating shaft and the second rotating shaft are all successively through described first bearing plate and the second bearing plate, and described first driving gear, the second driving gear are between the first bearing plate and the second bearing plate.

Preferably, described first rotating shaft is provided with the first rotary damping mechanism, and described first rotary damping mechanism is sheathed in described first rotating shaft, to provide between described first rotating shaft and described supporting resistance in relative rotation;

Described second rotating shaft is provided with the second rotary damping mechanism, and described second rotary damping mechanism is sheathed in described second rotating shaft, to provide between described second rotating shaft and described supporting resistance in relative rotation.

Preferably, described first rotary damping mechanism the first locking nut of comprising the first pad be set in successively in described first rotating shaft, the first spring sheet, the second pad and being threaded in for described first pad, the first spring sheet, the second pad and described supporting are pressed against each other in described first rotating shaft;

The second locking nut that described second rotary damping mechanism comprises the 3rd pad be set in successively in described first rotating shaft, the second spring sheet, the 4th pad and is threaded in for described 3rd pad, the second spring sheet, the 4th pad and described supporting being pressed against each other in described first rotating shaft.

Preferably, also comprise positioning piece, one end of described locating piece is socketed in described first rotating shaft and between described second pad and the first locking nut, and the other end of described locating piece to be socketed in described second rotating shaft and between described 4th pad and the second locking nut.

Preferably, described supporting also comprises one and is set in backing plate in the first rotating shaft and the second rotating shaft pivotly, described backing plate between the first bearing plate and the second bearing plate, and has sheathed and circumference is fixed on the 5th pad in described first rotating shaft, the second rotating shaft between described backing plate and described first bearing plate; Described first driving gear, the second driving gear and at least one driven gear are between described backing plate and described second bearing plate.

Preferably, the increasing of the frictional force when surface of contact of described backing plate and described first driving gear and the second driving gear is provided with for increasing rotation rubs structure.

A kind of Foldable electronic device, comprises the first housing, the second housing and turning gear as above;

The described first housing is fixedly connected with the first support of described turning gear, the described second housing is fixedly connected with the second support of described turning gear, to make the described first housing and the second housing can relatively rotating and to open or closed with described first support and the second support

According to turning gear provided by the invention and the Foldable electronic device with this turning gear, on the one hand, the frictional force of the first support and the second holder pivots process is increased by friction mechanism, on the other hand, sliding sleeve in retaining mechanism slides with the second holder pivots, and when sliding sleeve slides, the projection on sliding sleeve is slided in spiral slideway, so, the resistance in the second holder pivots can be increased; Again on the one hand, the resistance that elastic damping mechanism in retaining mechanism can provide sliding sleeve to slide, so, can make the second support maintenance and the first support in opened condition, by this, the present invention has larger rotation friction, have and good be rotationally connected effect, Long-Time Service frictional force can not decay substantially, long service life, secure and reliable connection.

Accompanying drawing explanation

Fig. 1 is embodiment of the present invention turning gear overall structure schematic diagram;

Fig. 2 is the overall structure schematic diagram at another visual angle of embodiment of the present invention turning gear;

Fig. 3 is the explosive view of embodiment of the present invention turning gear.

Reference character:

Supporting 10;

First bearing plate 101;

Second bearing plate 102;

Backing plate 103;

5th pad 104;

First rotating connector 20;

First rotating shaft 201;

First shaft part 2011;

Second shaft part 2022;

First support 202;

Pin 203;

Second rotating connector 30;

Second rotating shaft 301;

3rd shaft part 3011;

5th shaft part 3012;

Second support 302;

First chute 3021;

Second chute 3022;

Pin 303;

Friction mechanism 40;

First driving gear 401;

Second driving gear 402;

First driven gear 403;

Retaining mechanism 50;

Sleeve 501;

Sliding sleeve 502;

Protruding 5021;

Spring 503;

STATEMENT OF FEDERALLY SPONSORED 504;

Centerbody 5041;

First cursor 5042;

Second cursor 5043;

First bearing pin 505;

Second bearing pin 506;

First rotary damping mechanism 60;

First pad 601;

First spring sheet 602;

Second pad 603;

First locking nut 604;

Second rotary damping mechanism 70;

3rd pad 701;

Second spring sheet 702;

4th pad 703;

Second locking nut 704;

Locating piece 80.

The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.

Embodiment

Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.

In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", orientation or the position relationship of the instruction such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.

In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristics.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.

Shown in Fig. 3, embodiments provide a kind of turning gear, for Foldable electronic device, this turning gear comprises supporting 10, first rotating connector 20, second rotating connector 30, friction mechanism 40 and retaining mechanism 50.

Concrete, first rotating connector 20 comprises the first rotating shaft 201 and the first support 202, first rotating shaft 201 is connected to supporting 10 pivotly, first support 202 is fixedly connected on the first rotating shaft 201, and such as, in Fig. 1 to Fig. 3 example shown, the first support 202 is fixed in the first rotating shaft 201 by pin 203.That is, first rotating shaft 201 is rotated relative to supporting 10, first support 202 then can rotate with the rotation of described first rotating shaft 201, this first support 202 is for connecting the first housing (such as host main body) of Foldable electronic device, so, the first housing can rotate with the first support 202 and rotates.

Second rotating connector 30 comprises the second rotating shaft 301 and the second support 302, second rotating shaft 301 is connected to supporting 10 and relative with the first rotating shaft 201 pivotly, second support 302 is fixedly connected on the second rotating shaft 301, such as, in Fig. 1 to Fig. 3 example shown, the second support 302 is fixed in the second rotating shaft 301 by pin 303.That is, the second rotating shaft 301 can be rotated relative to supporting 10, and the second support 302 then can rotate with the rotation of the second rotating shaft 301.Because the first rotating shaft 201 is relative with the second rotating shaft 301, so when the first support 202 and/or the second support 302 rotate, the first support 202 and the second support 302 is close to each other or away from.This second support 302 is specifically for connecting the second housing (such as display device) of Foldable electronic device, so, can rotate away from the first support 202 and the second support 302 and open between the first housing of electronic product and the second housing, or together with rotating near with the first support 202 and the second support 302 and amounting to.

Friction mechanism 40 comprises the first driving gear 401, second driving gear 402 and at least one driven gear, first driving gear 401 is fixedly arranged in the first rotating shaft 201, second driving gear 402 is fixedly arranged in the second rotating shaft 301, and at least one driven gear pivotable can be arranged on supporting 10 and to engage respectively with the first driving gear 401 and the second driving gear 402.Due to the first driving gear 401, be engaged with each other between at least one driven gear and the second driving gear 402, so when the first support 202 and/or the second support 302 rotate, first rotating shaft 201, second rotating shaft 301 drives the first driving gear 401 and the second driving gear 402 to rotate respectively, first driving gear 401 and the second driving gear 402 drive at least one above-mentioned pinion rotation more further, so, frictional force when rotating between the first support 202 and the second support 302 can be increased by the engagement between gear, this frictional force is resistance, so, stability when the first support 202 and the second support 302 open mode can be improved.

Retaining mechanism 50 comprises sleeve 501, sliding sleeve 502 and elastic damping mechanism, sleeve 501 is socketed in the second rotating shaft 301 and fixes with supporting 10 circumference, that is between the second rotating shaft 301 and sleeve 501 being in relative rotation, and to be to relatively rotate between sleeve 501 and supporting 10.The circumferential surface of sleeve 501 is provided with spiral slideway, sliding sleeve 502 can be sheathed on the second support 302 slidably along the direction being parallel to the second rotating shaft 301, and sliding sleeve 502 is provided with the projection 5021 inserted in spiral slideway, when rotating to make the second support 302, sliding sleeve 502 slides relative to the second support 302, in the present embodiment, spiral slideway is half-turn, when the second support 302 rotates, protruding 5021 slide in spiral slideway, sliding sleeve 502 then slides on the second support 302, when protruding 5021 slide into the other end by one end of spiral slideway, sliding sleeve 502 correspondence slides into another position from a position the second support 302, and the second support 302 and the first support 202 can become closed state from open mode or become open mode from closed state.Elastic damping mechanism is connected between sliding sleeve 502 and the second support 302, resistance when sliding to provide sliding sleeve 502, when the second support 302 rotates, second support 302 drives the second rotating shaft 301 to rotate, simultaneously, slide in the spiral slideway of projection 5021 on sliding sleeve 502 on sleeve 501, and force sliding sleeve 502 to slide on the second support 302, and the resistance of elastic damping mechanism when providing sliding sleeve 502 to slide, sliding sleeve 502 is namely stoped to move, so, the resistance in the second support 302 rotation process can be increased.

According to turning gear provided by the invention and the Foldable electronic device with this turning gear, on the one hand, the frictional force of the first support 202 and the second support 302 rotation process is increased by friction mechanism 40, on the other hand, sliding sleeve 502 in retaining mechanism 50 rotates with the second support 302 and slides, and when sliding sleeve 502 slides, the projection 5021 on sliding sleeve 502 is slided in spiral slideway, so, the resistance in the second support 302 rotation can be increased; Again on the one hand, the resistance that elastic damping mechanism in retaining mechanism 50 can provide sliding sleeve 502 to slide, so, can make the second support 302 maintenance and the first support 202 in opened condition, by this, the present invention has larger rotation friction, have and good be rotationally connected effect, Long-Time Service frictional force can not decay substantially, long service life, secure and reliable connection.

In one embodiment of the invention, first rotating shaft 201 at least comprises the first shaft part 2011 and the second shaft part 2022, first shaft part 2011 has two relative fixed pans and runs through the through hole of two fixed pans, and the first support 202 is by being fixed in the first rotating shaft 201 through the through hole of pin 203.Second shaft part 2022 comprises two relative spacing planes and two relative arc surfaces, first driving gear 401 is set on the second shaft part 2022 by non-circular mating hole, and it is relatively fixing with relative two spacing plane circumferences, and supporting 10 is set on the second shaft part 2022 by circular port, and can relatively rotate with two relative arc surfaces.

Corresponding, second rotating shaft 301 comprises the 3rd shaft part 3011, the 4th shaft part and the 5th shaft part 3012,3rd shaft part 3011 has two relative fixed pans and runs through the through hole of two fixed pans, and the second support 302 is fixing with the second rotating shaft 301 by the pin 203 through this through hole.4th shaft part is cylindrical, and sleeve 501 is socketed in the 4th shaft part, and and can relatively rotate between the 4th shaft part.5th shaft part 3012 has two relative spacing planes and two relative arc surfaces, second driving gear 402 is set on the 5th shaft part 3012 by non-circular mating hole, and it is fixing with the 5th shaft part 3012 circumference, supporting 10 is then set on the 5th shaft part 3012 by circular port, and can relatively rotate with two relative arc surfaces.So, the linkage structure between the first rotating shaft 201, second rotating shaft 301, first support 202, second support 302, friction mechanism 40 etc. can be simplified, meanwhile, structural strength can be improved, also be beneficial to assembling.

In one embodiment of the invention, elastic damping mechanism comprises spring 503 and STATEMENT OF FEDERALLY SPONSORED 504, and STATEMENT OF FEDERALLY SPONSORED 504 comprises centerbody 5041 and the first cursor 5042 of extending to form from centerbody 5041 and the second cursor 5043 had angle with the first cursor 5042 shape.Centerbody 5041 can be pivotally connected to described second support 302, second support 302 is provided with the first chute 3021 and the second chute 3022, the free end of the first cursor 5042 is equipped with the first bearing pin 505, first bearing pin 505 is slidably disposed in the first chute 3021, the free end of the second cursor 5043 is equipped with the second bearing pin 506, second bearing pin 506 and is slidably disposed in the second chute 3022.One end of spring 503 is fixedly connected with the free end of the first cursor 5042, the other end of spring 503 and being fixedly connected with of sliding sleeve 502.So, when the second support 302 rotates along a direction (such as clockwise), sliding sleeve 502 on the second support 302 to a Slideslip, because spring 503 is connected with sliding sleeve 502, so, when sliding sleeve 502 is to a lateral movement of the second support 302, spring 503 is stretched, and the first cursor 5042 rotates, and the first bearing pin 505 slides in the first chute 3021, and the second cursor 5043 and the first cursor 5042 link, the secondth bearing pin 506 slides in the second chute 3022.And when the second support 302 rotates along another direction (such as counterclockwise), sliding sleeve 502 slides to opposite side on the second support 302, because spring 503 is connected with sliding sleeve 502, so, opposite side from sliding sleeve 502 to the second support 302 motion time, spring 503 shrinks gradually, first cursor 5042 rotates, first bearing pin 505 slides in the first chute 3021, and the second cursor 5043 and the first cursor 5042 link, and the second bearing pin 506 slides in the second chute 3022.This structural design, can make the second support 302 rotationally resistance greatly improve, need to apply larger torsional moment just the second support 302 and the first support 202 to be opened, open mode after opening, also need to apply larger torsional moment the second support 302 and the first support 202 to be closed, so, stability when the first support 202 and the second support 302 open mode can be improved.

Alternatively, in an example of the present invention, driven gear comprises the first driven gear 403 and the second driven gear, and the first driven gear 403 engages with the first driving gear 401 and the second driven gear, and the second driven gear engages with the second driving gear 402.When the first support 202 and/or the second support 302 rotate, first rotating shaft 201, second rotating shaft 301 drives the first driving gear 401 and the second driving gear 402 to rotate respectively, first driving gear 401 and the second driving gear 402 drive the first above-mentioned driven gear 403 and the second driven gear to rotate again further, so, frictional force when rotating between the first support 202 and the second support 302 can be made larger.

In one embodiment of the invention, supporting 10 comprises the first bearing plate 101 and the second bearing plate 102, first rotating shaft 201 and the second rotating shaft 301 all successively through the first bearing plate 101 and the second bearing plate 102, first driving gear 401, second driving gear 402 between the first bearing plate 101 and the second bearing plate 102.Specifically, spaced apart between the first bearing plate 101 and the second bearing plate 102, so, structural integrity and the reliability of whole turning gear can be improved.

In a preferred embodiment of the invention, the first rotating shaft 201 is provided with the first rotary damping mechanism 60 of rotary damping mechanism 60, first and is sheathed in the first rotating shaft 201, to provide between the first rotating shaft 201 and described supporting 10 resistance in relative rotation.Second rotating shaft 301 is provided with the second rotary damping mechanism 70 of rotary damping mechanism 70, second and is sheathed in the second rotating shaft 301, to provide between the second rotating shaft 301 and described supporting 10 resistance in relative rotation.

More specifically, in an example of the present invention, the first rotary damping mechanism 60 comprises the first pad 601, first spring sheet 602, second pad 603 be set in successively in described first rotating shaft 201 and the first locking nut 604 be threaded in for being pressed against each other with described supporting 10 by described first pad 601, first spring sheet 602, second pad 603 in described first rotating shaft 201.Concrete, such as, in Fig. 1 example shown, with spacing plane circumference fixing on first pad 601, second pad 603 is socketed in the first rotating shaft 201 the second shaft part 2022 by non-circular mating hole, and the first spring sheet 602 is set on the second shaft part 2022 of the first rotating shaft 201 by circular port, and can relatively rotate with arc surface.So, axial pressure can be provided by the first locking nut 604, first pad 601, second spring sheet 702, second pad 603 is pressed against each other with supporting 10, when the first rotating shaft 201 is rotated, the first pad 601, first spring sheet 602, second pad 603 and supporting 10 surface of contact each other produces surface friction drag.

Second rotary damping mechanism 70 comprises the 3rd pad 701, second spring sheet 702 be set in successively in described first rotating shaft 201, the 4th pad 703 and is threaded in the second locking nut 704 for described 3rd pad 701, second spring sheet 702, the 4th pad 703 being pressed against each other with described supporting 10 in described first rotating shaft 201.Concrete, such as, in Fig. 1 example shown, 3rd pad 701, the 4th pad 703 are socketed in the 5th shaft part 3012 of the first rotating shaft 201 by non-circular mating hole and fix with spacing plane circumference, and the second spring sheet 702 is set on the 5th shaft part 3012 of the second rotating shaft 301 by circular port, and can relatively rotate with arc surface.So, axial pressure can be provided by the second locking nut 704,3rd pad 701, second spring sheet 702, the 4th pad 703 and supporting 10 are pressed against each other, when the second rotating shaft 301 is rotated, the 3rd pad 701, second spring sheet 702, the 4th pad 703 and supporting 10 surface of contact each other produces surface friction drag.

More favorably, in an example of the present invention, also comprise positioning piece 80, one end of this locating piece 80 is socketed in the first rotating shaft 201 and between the second pad 603 and the first locking nut 604, and the other end of locating piece 80 to be socketed in the second rotating shaft 301 and between the 4th pad 703 and the second locking nut 704.So, this locating piece 80 can strengthen the reliability that supporting 10 is connected with the first rotating shaft 201, second rotating shaft 301.

In another embodiment of the present invention, supporting 10 also comprises one and is set in backing plate 103 in the first rotating shaft 201 and the second rotating shaft 301 pivotly, backing plate 103 between the first bearing plate 101 and the second bearing plate 102, and has sheathed and circumference is fixed on the 5th pad 104 in the first rotating shaft 201, second rotating shaft 301 between backing plate 103 and the first bearing plate 101; First driving gear 401, second driving gear 402 and at least one driven gear, between backing plate 103 and the second bearing plate 102, so, can strengthen the soundness of structure.

More favorably, in a preferred embodiment of the invention, the increasing of the frictional force when surface of contact of backing plate 103 and the first driving gear 401 and the second driving gear 402 is provided with for increasing rotation rubs structure.Such as, friction protrusion 5021 is provided with at the lower surface of the first driving gear 401 and the second driving gear 402, and be provided with pit at the upper surface of backing plate 103, so, in rotation process, the surface friction drag of the surface of contact of backing plate 103 and the first driving gear 401 and the second driving gear 402 can increase further.

Present invention also offers a kind of Foldable electronic device, comprise the first housing, the second housing and the turning gear as described in above-described embodiment.The described first housing is fixedly connected with the first support 202 of described turning gear, the described second housing is fixedly connected with the second support 302 of described turning gear, to make the described first housing and the second housing can relatively rotating and to open or closed with described first support 202 and the second support 302.

According to Foldable electronic device provided by the invention, owing to adopting the turning gear described in above-described embodiment, on the one hand, increased the frictional force of the first support 202 and the second support 302 rotation process by friction mechanism 40, on the other hand, the sliding sleeve 502 in retaining mechanism 50 rotates with the second support 302 and slides, and sliding sleeve 502 is when sliding, projection 5021 on sliding sleeve 502 is slided in spiral slideway, so, can increase the resistance in the second support 302 rotation; Again on the one hand, the resistance that elastic damping mechanism in retaining mechanism 50 can provide sliding sleeve 502 to slide, so, can make the second support 302 maintenance and the first support 202 in opened condition, by this, the present invention has larger rotation friction, have and good be rotationally connected effect, Long-Time Service frictional force can not decay substantially, long service life, secure and reliable connection.

In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.

Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art can change above-described embodiment within the scope of the invention when not departing from principle of the present invention and aim, revising, replacing and modification.