CN105466105B

CN105466105B - Refrigerator

Info

Publication number: CN105466105B
Application number: CN201510969919.6A
Authority: CN
Inventors: 杨发林; 徐志国; 窦金强
Original assignee: Qingdao Haier Co Ltd
Current assignee: Qingdao Haier Co Ltd
Priority date: 2015-12-21
Filing date: 2015-12-21
Publication date: 2019-05-31
Anticipated expiration: 2035-12-21
Also published as: CN105466105A

Abstract

The present invention provides a kind of refrigerators.The refrigerator includes: cabinet, and box house defines the first storage room；First, first is pivotably disposed in the front surface of cabinet, and first defines the second storage room；Second, second is pivotably disposed in first front, for closing the second storage room；And first is formed with arc-shaped recess on the surface at second pivotal axis rear, so that second door body turning close to pivotal axis side has rotation space.Second relative to first pivotal movement when, second door body turning close to pivotal axis side is avoided and first generation constructive interference using the arc-shaped recess, in addition it also can reduce the gap between first and second, the aesthetics for guaranteeing the good leakproofness of refrigerator and entirety, saves the whole occupied space of refrigerator.

Description

Refrigerator

Technical field

The present invention relates to family's electro-technical fields, more particularly to a kind of refrigerator.

Background technique

As society is increasingly developed, people's lives level is also gradually increased.For a large amount of various kinds of foods of purchase or its Its article, refrigerator have become the indispensable household electrical appliance of people, play and guarantee the quality to the storage of food and other articles Fresh important function improves the convenience of people's life.

Since various kinds of foods and article need to be stored respectively according to different conditions of storage, refrigerator can be arranged different Storage compartment stores different food and article respectively.Two storied gate refrigerator is designed using double-layer overlapped door, between the storage of front Room, which can store, easily takes common food, and needed for can easily and quickly finding, it is fresh that rear portion storage compartment can place needs The food materials of storage meet the storage of large volume, realize that proportional space utilizes.

The hinged component and stop part of present two storied gate refrigerator have respectively two sets, first and second respectively around two The pivotal axis of hinge axis limit is rotarily opened or is closed.It is rotarily opened or the down periods due to second, second close to pivoting The door body turning of axis side will receive first influence.In order to avoid this influence, existing two storied gate refrigerator door is opened When need to occupy biggish space, place this kind of refrigerator to user and bring inconvenience.

Summary of the invention

In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind State the refrigerator of problem.

A further object of the invention is the space occupied when two storied gate refrigerator door to be reduced is opened.

A further object of the invention is refrigerator poor sealing to be avoided, the problem of overall aesthetics difference.

According to an aspect of the present invention, the present invention provides a kind of refrigerators.The refrigerator includes: cabinet, box house limit Surely there is the first storage room；First, first is pivotably disposed in the front surface of cabinet, and first defines the second storing Compartment；Second, second is pivotably disposed in first front, for closing the second storage room；And first It is formed with arc-shaped recess on the surface at second pivotal axis rear, for described second door close to pivotal axis side Body turning has rotation space.

Optionally, refrigerator further includes bottom hinge component, and bottom hinge component includes: first axle part, first axle part The lower end of first lower end and cabinet is pivotally connected；With second hinge part, second hinge part is by second lower end and One lower end is pivotally connected, wherein the side table of the close first axle part from the pivot axle center of first axle part to first The distance in face is less than or equal to the side surface of the close second hinge part from the pivot axle center of second hinge part to second Distance.

Optionally, first axle part includes: first connecting portion, is fixed with the lower end of cabinet；First extension connects from first Socket part extends to the front of cabinet；And first axle axis, it is vertically installed in the first extension, the lower end of insertion first, limit Make first pivotal axis.

Optionally, second hinge part includes: second connecting portion, and the lower end with first is fixed, and is provided with for the first hinge The assembly axis hole that chain rivet passes through；Second extension extends from second connecting portion to the front of cabinet；And second hinge axis, it hangs down It is directly set to the second extension, the lower end of insertion second limits second pivotal axis.

Optionally, bottom hinge component further include: lifting force aid part, be set to first axle part and second hinge part it Between, and fixed with second hinge part, with inclined second cam face；And the first extension also has and the second cam First cam face of surface engagement, in first rotary course, the first cam face and the second cam face it is opposite Position changes.

Optionally, bottom hinge component further include: the first stop part is fixed on first lower end, is configured to first Door pivots and is stopped when being switched to certain angle by first axle part.

Optionally, stating the first stop part includes: third interconnecting piece, and the lower end with first is fixed；First stopper section, from The forward edge of three interconnecting pieces extends vertically downward；And the forward edge of first axle part, which also has, stops the first stopper section Motion-stopping surface, to stop the first stop part to continue to rotate after the first stopper section rotates by a certain angle.

Optionally, second connecting portion passes through the stage portion being turned over downwards and connect with the second extension, so that the second extension Lower than second connecting portion；And the first stopper section also has notch, to avoid in rotary course with the second extension and The interference of two hinge axis.

Optionally, third interconnecting piece has the axle sleeve passed through for first axle axis extended downwardly, and axle sleeve is through dress With axis hole.

Optionally, force aid part, second connecting portion, third interconnecting piece are gone up and down and is also respectively provided with perforative screw hole, for screw It passes through, makes to go up and down the lower end that force aid part, second connecting portion, third interconnecting piece are fixed on first.

Optionally, bottom hinge component further include: the second stop part is fixed on second lower end, is configured to second Door pivotal movement is simultaneously stopped in rotation to certain angle by second hinge part.

Optionally, the second stop part includes: the 4th interconnecting piece, and the lower end with second is fixed；Second stopper section, from the 4th The forward edge of interconnecting piece extends vertically downward；And the forward edge of second hinge part, which also has, stops stopping for the second stopper section Dynamic face, to stop the second stop part to continue to rotate after the second stopper section rotates by a certain angle.

Refrigerator of the invention includes the internal preceding table for defining the cabinet of the first storage room, being pivotably disposed in cabinet Face and define first of the second storage room, be pivotably disposed in first front and for close the second storing between Second of room.First is formed with arc-shaped recess on the surface at second pivotal axis rear, for second it is close The door body turning of pivotal axis side has rotation space, second relative to first pivotal movement when, second close to pivot The door body turning of shaft side using the arc-shaped recess avoid with first generation constructive interference, in addition also can reduce first And the gap between second, guarantee the aesthetics of the good leakproofness of refrigerator and entirety.

Further, refrigerator of the invention makes first to be formed with arc on the surface at second pivotal axis rear Recess makes so that the door body turning of second close pivotal axis side has rotation space close to the refrigerator turning of hinge axis The pivot spaces needed are obviously reduced, to save the whole occupied space of refrigerator.

According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter The above and other objects, advantages and features of the present invention.

Detailed description of the invention

Some specific embodiments of the present invention is described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter. Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that these What attached drawing was not necessarily drawn to scale.In attached drawing:

Fig. 1 is the schematic diagram that refrigerator according to an embodiment of the invention is in door body closed state；

Fig. 2 is that refrigerator according to an embodiment of the invention is in the schematic diagram for opening the first door state；

Fig. 3 is that refrigerator according to an embodiment of the invention is in the schematic diagram for opening the second door state；

Fig. 4 is the partial enlarged view of refrigerator according to an embodiment of the invention；

Fig. 5 is the top view of bottom hinge component in refrigerator according to an embodiment of the invention；

Fig. 6 is the side view of bottom hinge component in refrigerator according to an embodiment of the invention；

Fig. 7 is the component explosive view of bottom hinge component in refrigerator according to an embodiment of the invention；And

Fig. 8 is the assembling schematic diagram of bottom hinge component in refrigerator according to an embodiment of the invention.

Specific embodiment

Fig. 1 is the schematic diagram that refrigerator 1 according to an embodiment of the invention is in door body closed state.Fig. 2 is according to this The refrigerator 1 of invention one embodiment is in the schematic diagram for opening first 20 state.Fig. 3 is according to an embodiment of the invention Refrigerator 1 is in the schematic diagram for opening second 30 state.

As shown, refrigerator 1 according to an embodiment of the invention generally may include cabinet 10, first 20, Second 30 and bottom hinge component 40.

The first storage room 11 is defined inside cabinet 10, the structure of the first storage room 11 can be matched according to demand Set, can by demarcation plate it is longitudinally split be multiple storage areas, utilize rack or drawer storage article.First storage room 11 are configurable to refrigerator room, freezing compartment, alternating temperature compartment or fresh-keeping compartment according to purposes difference.Generally, the first storage Object compartment 11 can place the food materials for needing fresh storage, can satisfy the storage of large volume, realize that proportional space utilizes.Fig. 2 In show the state that the first storage room 11 appears.

Pivotally it is set to the front surface of cabinet 10 for first 20, when first 20 unlatching, article can be by It is removed or placed into from the first storage room 11.The second storage room 22 can be defined for first 20.Second storage room 22 Structure can also be configured according to demand, can it is longitudinally split by demarcation plate be multiple storage areas, using rack or Drawer storage article.Second storage room 22 is also configurable to refrigerator room, freezing compartment, alternating temperature compartment according to purposes difference Or fresh-keeping compartment.Generally, the second storage room 22, which can be stored, easily takes common food, and user is allow to easily find institute It needs.The state that the second storage room 22 appears is shown in Fig. 3.

First 20 front is pivotally set to for second 30, for closing the second storage room 22.Its In, when second 30 closing, second 30 and first 20 front surface is in close contact to close the second storage room 22；The When two 30 unlatchings, the second storage room 22 can be opened, article can be removed or placed into from the second storage room 22.When When one 20 closing, second 30 can also independently be pivoted to open or close the second storage room 22.Due to first 20 Define the second storage room 22 that can store article, therefore first 20 thickness can generally be greater than second 30 thickness Degree.

Above first 20 and second 30 is pivoted connection by hinge component respectively, and hinge component may include top Portion's hinge component (not shown) and bottom hinge component 40, to be separately connected first 20 and second 30 top and bottom Portion.

Fig. 4 is the partial enlarged view of refrigerator 1 according to an embodiment of the invention.As shown in figure 4, first 20 is located at the It is formed with arc-shaped recess 21 on the surface at two 30 pivotal axis rears, so that second 30 door body close to pivotal axis side turns Angle has rotation space.Second 30 relative to first 20 pivotal movement when, second 30 door close to pivotal axis side Body turning using the arc-shaped recess 21 avoid with first 20 generation constructive interference, in addition also can reduce first 20 and second Gap between door 30 guarantees the aesthetics of the good leakproofness of refrigerator 1 and entirety, is also the pivot axle center of hinge to door body The distance of side surface of close hinge offer necessary condition is be provided, to reduce the occupied space of refrigerator 1.

Fig. 5 is the top view of bottom hinge component 40 in refrigerator 1 according to an embodiment of the invention.As shown in figure 5, bottom Portion's hinge component 40 includes first axle part 41 and second hinge part 43.First axle part 41 is by first 20 lower end and cabinet 10 lower end is pivotally connected；Second 30 lower end and first 20 lower end are pivotally connected by second hinge part 43.Wherein, from The distance D1 of the pivot axle center of first axle part 41 to the side surface of first 20 close first axle part 41 is less than or waits Distance D2 in the side surface of the close second hinge part 43 from the pivot axle center of second hinge part 43 to second 30.First 20 are pivoted simultaneously with the pivot axle center of first axle part 41 with second 30, to appear the first storage room 11.Second 30 can also be pivoted alone about the pivot axle center of second hinge part 43, to appear the second storage room 22.

Due to from first axle part 41 pivot axle center to the side surface of first 20 close first axle part 41 away from From the side surface that D1 is less than or equal to the close second hinge part 43 from the pivot axle center of second hinge part 43 to second 30 Distance D2 when, rotarily open for second 30 or the down periods, the door body turning of second 30 close pivotal axis side can be by It is interfered to first 20, not certain rotation space, to influence use of the user for refrigerator double door.And first 20 It is formed with arc-shaped recess 21 on the surface at second 30 pivotal axis rear, it is real when rotarily opening or closing for second 30 It now steps down, makes the door body turning of second 30 close pivotal axis side that there is certain rotation space, so that first of refrigerator 1 20 and second 30 can independently open or close, will not interact, the usage experience of user be improved, in pivoting process In, the pivot spaces needed close to the refrigerator turning of hinge axis are obviously reduced, to save the whole occupied space of refrigerator 1.

The distance D1 of the side surface of close first axle part 41 from the pivot axle center of first axle part 41 to first 20 Less than or equal to from second hinge part 43 pivot axle center to the side surface of second 30 close second hinge part 43 away from From D2, can also be realized by the way that certain interval is arranged between first 20 and second 30.Second can also equally be made The door body turning of 30 close pivotal axis side has certain rotation space.But this method will affect the whole outer of refrigerator See, and user's finger be easy to cause to be clamped by gap, endanger user using safe, therefore the present embodiment preferably uses first Door 20 is formed with the structure of arc-shaped recess 21 on the surface at second 30 pivotal axis rear.

In order to from first axle part 41 pivot axle center to the side surface of first 20 close first axle part 41 away from From the side surface that D1 is less than or equal to the close second hinge part 43 from the pivot axle center of second hinge part 43 to second 30 Distance D2, can also utilize special refrigerator doors body processing technology, make first 20 influence second 30 close pivotal axis The part door frame wedgewise of the door body turning rotation of side, when rotarily opening or closing for second 30, second 30 is leaned on The door body turning of nearly pivotal axis side has certain rotation space.But this method also will affect the overall appearance of refrigerator, together When influence refrigerator leakproofness, reduce the storing effect of refrigerator.In addition, this refrigerator door processing technology can be more complicated, increase Add the manufacturing cost of refrigerator door, therefore the present embodiment preferably uses first 20 table positioned at second 30 pivotal axis rear The structure of arc-shaped recess 21 is formed on face.

Fig. 6 is the side view of bottom hinge component 40 in refrigerator 1 according to an embodiment of the invention, and Fig. 7 is according to this The component of bottom hinge component 40, which explodes, in the refrigerator 1 of invention one embodiment is intended to, and Fig. 8 is according to an embodiment of the present invention Refrigerator 1 in bottom hinge component 40 assembling schematic diagram.As shown, bottom hinge component 40 is in addition to above-mentioned first axle part 41 and second hinge part 43, it further include the first stop part 42, the second stop part 44 and lifting force aid part 45.

Wherein, first axle part 41 includes: first connecting portion 411, the first extension 412 and first axle axis 413.The Two hinge part 43 includes: second connecting portion 431, the second extension 432 and second hinge axis 433.First stop part 42 includes: Third interconnecting piece 421 and the first stopper section 422.Second stop part 44 includes: the 4th interconnecting piece and the second stopper section 442.

First axle part 41 includes: first connecting portion 411, the first extension 412 and first axle axis 413.First connects Socket part 411 has the shape of plate, can be seperated part, is connected to 10 lower end of cabinet and cabinet 10 is fixed；It is also possible to and case The component of 10 one of body, is extended from 10 bottom of cabinet to 10 front of cabinet.First extension 412 can be from first connecting portion 411 End extend to 10 front of cabinet, and can have stepped or sloping portion.First axle axis 413 is vertically installed in first The end of extension 412, the lower end that insertion is first 20, limits first 20 pivotal axis, so that first 20 pivot is opened It opens or closes.

Second hinge part 43 includes: second connecting portion 431, the second extension 432 and second hinge axis 433.Second connects Socket part 431 has the shape of plate, and the lower end with first 20 is fixed, and is provided with the assembly axis hole passed through for first axle axis 413 434.Second extension 432 can from the end of second connecting portion 431 to 10 front of cabinet extend, and can have it is stepped or Sloping portion.Second hinge axis 433 is vertically installed in the end of the second extension 432, and the lower end that insertion is second 30 limits Second 30 pivotal axis, so that second 30 pivot opens or closes.

The diameter of first axle axis 413 can be greater than the diameter of second hinge axis 433, because first 20 thickness is greater than Second 30 thickness, moreover, first 20 further includes the second storage room 22, when article is stored in the second storage room 22 When, first 20 weight can aggravate.Therefore, the diameter of first axle axis 413 can be sufficiently large to stablize support first 20 It realizes to pivot and open or close, to guarantee structural strength.

Lifting force aid part 45 is set between first axle part 41 and second hinge part 43, and solid with second hinge part 43 Fixed, lifting 45 lower end of force aid part has inclined second cam face 451.First extension 412 also has and the second CAM table The first cam face 414 that face 451 cooperates, in first 20 rotary course, the first cam face 414 and the second CAM table The relative position in face 451 changes, and may be implemented first 20 and is automatically closed.Generally, when first 20 opening angle When smaller, the relative position of the first cam face 414 and the second cam face 451 makes first 20 to be closed automatically by gravity It closes.When lifting force aid part 45 makes first 20 opening angle be less than predetermined angle, it is defaulted as being opened by mistake and opens or do not close completely It closes, realizes that 1 first 20, refrigerator is closed in time, reduces loss of refrigeration capacity.

First stop part 42 is fixed on first 20 lower end, can pivot and with first 20 in rotation to certain angle When stopped by first axle part 41.First stop part 42 includes: third interconnecting piece 421 and the first stopper section 422.Third interconnecting piece 421 shapes with plate, the lower end with first 20 fixes, and is provided with passing through for first axle axis 413 of extending downwardly Axle sleeve 423, and assembly axis hole 434 of the axle sleeve 423 in second connecting portion 431.First stopper section 422 is from third interconnecting piece 421 forward edge extends vertically downward, and the forward edge of first axle part 41 also has the first stopper section 422 of blocking Motion-stopping surface, to stop the first stop part 42 to continue to rotate after the first stopper section 422 rotates by a certain angle, to prevent first Door 20 opened wide-angle.

Second connecting portion 431 passes through the stage portion being turned over downwards and connect with the second extension 432, so that the second extension 432 are lower than second connecting portion 431；And the first stopper section 422 also has notch, extends to avoid in rotary course with second Portion 432 and second hinge axis 433 are interfered.

Lifting force aid part 45, second connecting portion 431, third interconnecting piece 421 are also respectively provided with perforative screw hole 452, screw hole 435, screw hole 424 make lifting force aid part 45, second connecting portion 431, third interconnecting piece 421 be fixed on first so that screw passes through The lower end of door 20.In addition, second connecting portion 431, third interconnecting piece 421 are also respectively provided with perforative location hole 436, location hole 425, positioning is realized to cooperate with positioning pin (not shown), guarantees assembly precision.

Second stop part 44 may include the 4th interconnecting piece (being blocked in figure, be not shown) and the second stopper section 442.4th Interconnecting piece is tabular, and the lower end with second 30 is fixed.Second stopper section 442 from the forward edge of the 4th interconnecting piece vertically to Lower extension, and the forward edge of second hinge part 43 also has the motion-stopping surface for stopping the second stopper section 442, in the second backstop Portion 442 stops the second stop part 44 to continue to rotate after rotating by a certain angle, to prevent second 30 to open wide-angle.

The refrigerator 1 of the present embodiment utilizes above-mentioned bottom hinge component 40, when first 20 closing may be implemented, second 30 It can be rotated independently about the pivotal axis that second hinge axis 433 limits, to selectively open and close the second storing Compartment 22 completes the loading or unloading operation of the article in 1 second storage room 22 of refrigerator, and in first 20 rotation, and first 20 drive the second connecting portion 431 of second hinge parts 43, and second 30 20 static relative to first, together around first axle The pivotal axis rotation that axis 413 limits, second 30 is closed and first 20 unlatching, to selectively open and close first Storage room 11 completes the loading or unloading operation of the article in 1 first storage room 11 of refrigerator.

The refrigerator 1 of the present embodiment further includes the top hinge component being used cooperatively with bottom hinge component 40, top hinge The first axle axis 413 of first 20 hinge axis and first axle part 41 of component is coaxial, allows first 20 to pivot It opens or closes；The second hinge axis 433 of second 30 hinge axis and second hinge part 43 of top hinge component is coaxial, makes It must can pivot for second 30 and open or close.

The refrigerator 1 of the present embodiment is formed with arc on the surface at second 30 pivotal axis rear by first 20 Recess 21, so that the second 30 door body turning close to pivotal axis side has rotation space.At second 30 relative to first When 20 pivotal movement of door, the second 30 door body turning close to pivotal axis side is avoided and first 20 using the arc-shaped recess 21 Constructive interference is generated, in addition also can reduce the gap between first 20 and second 30, guarantees the good leakproofness of refrigerator 1 And whole aesthetics.

Further, the refrigerator 1 of the present embodiment reduce from first axle part 41 to pivot axle center close to first 20 The distance D1 of the side surface of first axle part 41, so that pivoting axle center to first 20 close to first from first axle part 41 The distance D1 of the side surface of hinged component 41 be less than or equal to from second hinge part 43 to pivot axle center close to second 30 The distance D2 of the side surface of second hinge part 43.In pivoting process, close to the pivot spaces of the refrigerator turning of hinge axis needs It is obviously reduced, to save the whole occupied space of refrigerator 1.

So far, although those skilled in the art will appreciate that present invention has been shown and described in detail herein multiple shows Example property embodiment still without departing from the spirit and scope of the present invention, still can according to the present disclosure directly Determine or deduce out many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and recognizes It is set to and covers all such other variations or modifications.

Claims

1. a kind of refrigerator, comprising:

Cabinet, the box house define the first storage room；

First, described first is pivotably disposed in the front surface of the cabinet, and described first defines the second storing Compartment；

Second, described second is pivotably disposed in first front, for closing second storage room, Wherein first thickness is greater than second thickness；And

Described first is formed with arc-shaped recess on the surface at described second pivotal axis rear, for described second Door body turning close to pivotal axis side has rotation space；

Wherein the refrigerator further includes bottom hinge component, and the bottom hinge component includes: first axle part, first hinge First lower end and the lower end of the cabinet are pivotally connected by chain element；With second hinge part, the second hinge part will Second lower end and first lower end are pivotally connected, wherein from the pivot axle center of the first axle part to Described first close to the first axle part side surface distance be less than from the pivot axle center of the second hinge part to The distance of described second side surface close to the second hinge part；

Wherein the first axle part includes: first connecting portion, is fixed with the lower end of the cabinet；First extension, from described First connecting portion extends to the front of the cabinet；And first axle axis, it is vertically installed in first extension, is inserted into institute The lower end for stating first limits first pivotal axis；

Wherein the second hinge part includes: second connecting portion, is fixed with first lower end, is provided with for described the The assembly axis hole that one hinge axis passes through；Second extension extends from the second connecting portion to the front of the cabinet；And the Two hinge axis is vertically installed in second extension, is inserted into second lower end, limits second pivot Axis；

The bottom hinge component further include: the first stop part is fixed on first lower end, is configured to described first Door pivots and is stopped when being switched to certain angle by the first axle part；

Wherein first stop part includes: third interconnecting piece, is fixed with first lower end；First stopper section, from institute The forward edge for stating third interconnecting piece extends vertically downward；And the forward edge of the first axle part also has described in blocking The motion-stopping surface of first stopper section, to stop first stop part to continue to revolve after first stopper section rotates by a certain angle Turn；

The second connecting portion passes through the stage portion being turned over downwards and connect with second extension, so that second extension Lower than the second connecting portion；And first stopper section also has notch, to avoid in rotary course with described second Extension and second hinge axis interference；

The third interconnecting piece has the axle sleeve passed through for the first axle axis extended downwardly, and the axle sleeve runs through institute State assembly axis hole.

2. refrigerator according to claim 1, wherein the bottom hinge component further include:

Force aid part is gone up and down, is set between the first axle part and the second hinge part, and is solid with the second hinge part It is fixed, with inclined second cam face；And

First extension also has the first cam face with second cam face cooperation, in first rotation During turning, the relative position of first cam face and second cam face changes.

3. refrigerator according to claim 2, wherein

The lifting force aid part, the second connecting portion, the third interconnecting piece are also respectively provided with perforative screw hole, for screw It passes through, the lifting force aid part, the second connecting portion, the third interconnecting piece is made to be fixed on first lower end.

4. refrigerator according to claim 3, wherein the bottom hinge component further include:

Second stop part is fixed on second lower end, is configured to second pivotal movement and in rotation to one Determine to be stopped when angle by the second hinge part.

5. refrigerator according to claim 4, wherein second stop part includes:

4th interconnecting piece is fixed with second lower end；

Second stopper section extends vertically downward from the forward edge of the 4th interconnecting piece；And

The forward edge of the second hinge part also has the motion-stopping surface for stopping second stopper section, in second backstop Portion stops second stop part to continue to rotate after rotating by a certain angle.