CN104343307B - Lifting hinge device - Google Patents

Abstract

The invention discloses a lifting hinge device which comprises an upper hinge, a lower hinge, a transmission seat and a transmission rod. The upper hinge comprises an upper shaft sleeve and an upper hinge sheet fixedly connected with the upper shaft sleeve; the lower hinge comprises a lower shaft sleeve and a lower hinge sheet fixedly connected with the lower shaft sleeve; the transmission base is fixedly connected with the upper shaft sleeve, the bottom end surface of the transmission base is concavely provided with a transmission cavity, and the inner rotating surface of the transmission cavity is provided with a first spiral part. The transmission rod is fixedly connected with the lower shaft sleeve, a second spiral part is arranged on the outer revolution surface of the transmission rod, the transmission rod is connected with the transmission cavity, and the first spiral part is engaged with the second spiral part in a matching way, wherein: the upper hinge is pushed to rotate relative to the lower hinge, and the upper hinge can ascend through the matching of the first spiral part and the second spiral part; the upper hinge descends under the action of gravity by releasing and pushing, and the upper hinge can automatically reset and return to be closed through the matching of the first spiral part and the second spiral part. It has the following advantages: the cost is low; the connecting strength is high, the stability is high, the damage is not easy, and the service life is long; the appearance is beautiful.

Description

Lifting hinge device

technical field

The invention relates to a lifting hinge device.

Background technique

In order to realize the automatic closing of the door, two kinds of self-closing leaf devices are disclosed in the prior art.

The first type is a self-closing device, including an upper hinge, a lower hinge and a shaft core. The upper hinge includes an upper shaft sleeve and an upper hinge piece fixedly connected to the upper shaft sleeve, and the lower hinge includes a lower shaft sleeve and a lower hinge piece fixedly connected to the lower shaft sleeve. The shaft core is arranged in the upper shaft sleeve and the lower shaft sleeve, and the shaft core and the lower shaft sleeve are fixedly connected, and the upper shaft sleeve can be movably connected outside the shaft core. In order to realize automatic closing, an elastic body is arranged between the shaft core and the upper shaft sleeve. Push the upper hinge to make the upper hinge rotate relative to the lower hinge, and the elastic body stores energy; release the push, and the elastic body releases energy to automatically reset the upper hinge. This kind of self-closing device needs to be equipped with a shaft core and an elastic body, so it has the following disadvantages: a. Additional elastic body, high cost; b. Inconvenient assembly, high assembly cost; c. Complex structure, high cost.

The second type is a lifting self-closing device, such as CN2435489 announced by the Chinese patent database, which includes an upper hinge, a lower hinge and a shaft core. The upper hinge includes an upper shaft sleeve and an upper hinge piece fixedly connected to the upper shaft sleeve, and the lower hinge includes a lower shaft sleeve and a lower hinge piece fixedly connected to the lower shaft sleeve. The shaft core is arranged in the upper shaft sleeve and the lower shaft sleeve, and the shaft core and the lower shaft sleeve are fixedly connected, and the upper shaft sleeve can be movably connected outside the shaft core. The lower edge of the upper shaft sleeve is set as a spiral edge, the upper edge of the lower shaft sleeve is set as a spiral edge, and the lower edge of the upper shaft sleeve is matched with the upper edge of the lower shaft sleeve. Push the upper hinge to make the upper hinge rotate relative to the lower hinge, and the upper hinge can rise through the cooperation of the two helical edges; release the push to make the upper hinge fall under the action of gravity, and the upper hinge can automatically move through the cooperation of the two helical edges. reset. The upper hinge is raised or the upper hinge is reset through the cooperation of the two helical edges, so there are the following disadvantages: a. It needs to be equipped with a shaft core, which is costly; b. The helical edge bears the gravity, and the helical edge bears the force transmission function, which is easy Damage, short service life; c. Unsightly appearance; d. Only single spiral can be set.

Contents of the invention

The invention provides a self-closing page device, which overcomes the shortcomings of the self-closing page device in the background art.

One of the adopted technical schemes that the present invention solves its technical problem is:

Lifting hinge device, including:

An upper hinge, including an upper shaft sleeve and an upper hinge piece fixedly connected to the upper shaft sleeve;

The lower hinge, including the lower shaft sleeve and the lower hinge piece fixed to the lower shaft sleeve;

A transmission seat, fixedly connected to the upper shaft sleeve, the bottom end surface of the transmission seat is concavely provided with a transmission cavity, and the rotating surface of the transmission cavity is provided with a first helical part; and

A transmission rod, fixedly connected to the lower shaft sleeve, the outer rotating surface of the transmission rod is provided with a second helical part, the transmission rod is connected in the transmission cavity, the first helical part and the second helical part are adapted to engage, wherein: push The upper hinge makes the upper hinge rotate relative to the lower hinge, and the upper hinge can be raised through the cooperation of the first helical part and the second helical part; the release of the push makes the upper hinge fall under the action of gravity, and the first helical part and the second helical part can cooperate to make the upper hinge go down. The cooperation of the second spiral part can make the upper hinge reset automatically.

In one embodiment: the lower part of the transmission seat protrudes from the upper bushing, and the lower bushing is fitted and movably socketed outside the lower part of the transmission seat.

In one embodiment: the transmission rod has a revolving body structure and includes a solid seat and a rod fixed to the solid seat, the second helical part is arranged at the rod, and the outer diameter of the solid seat is larger than the outer diameter of the rod. The solid seat is adapted and fixed in the lower shaft sleeve.

In one embodiment: the upper part of the fixed seat protrudes from the lower bushing, and the upper bushing is fit and movably socketed outside the upper part of the fixed seat.

In an embodiment: the first helical part and the second helical part are respectively a flange structure and a groove structure, or are respectively a groove structure and a flange structure.

Two of the adopted technical scheme that the present invention solves its technical problem is:

Lifting hinge device, including:

An upper hinge, including an upper shaft sleeve and an upper hinge piece fixedly connected to the upper shaft sleeve;

The lower hinge, including the lower shaft sleeve and the lower hinge piece fixed to the lower shaft sleeve;

A transmission rod, fixedly connected to the upper shaft sleeve, the outer rotating surface of the transmission rod is provided with a second helical part; and

A transmission seat, fixedly connected to the lower shaft sleeve, the top surface of the transmission seat is concavely provided with a transmission cavity, and the rotating surface inside the transmission cavity is provided with a first helical part; the transmission rod is connected in the transmission cavity, the first helical part and The second helical part is adapted to engage, wherein: push the upper hinge to make the upper hinge rotate relative to the lower hinge, and the upper hinge can be raised through the cooperation of the first helical part and the second helical part; release the push to make the upper hinge in the Falling under the action of gravity, the upper hinge can be automatically reset through the cooperation of the first helical part and the second helical part.

In one embodiment: the upper part of the transmission seat protrudes from the lower bushing, and the upper bushing is movably socketed outside the upper part of the transmission seat.

In one embodiment: the transmission rod has a revolving body structure and includes a solid seat and a rod fixed to the solid seat, the second helical part is arranged at the rod, and the outer diameter of the solid seat is larger than the outer diameter of the rod. The solid seat is fit and fixed in the upper shaft sleeve.

In one embodiment: the lower part of the fixed seat protrudes from the upper bushing, and the lower bushing is fitted and movably socketed outside the lower part of the fixed seat.

In an embodiment: the first helical part and the second helical part are respectively a flange structure and a groove structure, or are respectively a groove structure and a flange structure.

Compared with the background technology, this technical solution has the following advantages:

1. The upper shaft sleeve is fixedly connected to the transmission seat, the lower shaft sleeve is fixed to the transmission rod, or, the upper shaft sleeve is fixed to the transmission rod, the lower shaft sleeve is fixed to the transmission seat, the transmission rod is connected to the transmission chamber, the first helical part and the second helical part Partially fit and mesh, push the upper hinge to make the upper hinge rotate relative to the lower hinge, and the upper hinge can rise through the cooperation of the first helical part and the second helical part; release the push to make the upper hinge fall under the action of gravity, Through the cooperation of the first helical part and the second helical part, the upper hinge can be reset. This reset is, for example, self-closing, so it overcomes the shortcomings of the background technology and produces the following technical effects: a. Low; b. The transmission rod and the transmission seat bear the gravity and bear the force transmission function, and the transmission rod is set in the transmission seat, which has high connection strength, high stability, is not easy to damage, and has a long service life; c. Upper and lower bushings The end edges are flush and the appearance is beautiful; d. Single, double, three, four, five, six, seven, eight and other spirals can be set according to needs; e. The upper hinge rises when turning, and the door leaf will not rub against the ground.

The lower part of the transmission seat protrudes from the upper shaft sleeve, and the lower shaft sleeve is adapted to be movably socketed outside the lower part of the transmission seat to ensure that the upper and lower shaft sleeves are coaxial.

The upper part of the fixed seat protrudes from the lower shaft sleeve, and the upper shaft sleeve is adapted and movably socketed outside the upper part of the fixed seat, which can ensure the coaxiality of the upper and lower shaft sleeves.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

FIG. 1 shows a schematic structural view of the self-closing device of the first embodiment.

Fig. 2 is a schematic diagram showing the structure of the transmission seat and the transmission rod in the disassembled state of the first embodiment.

FIG. 3 shows a schematic cross-sectional view along line A-A of FIG. 2 .

Fig. 4 is a schematic structural diagram of the self-closing device of the second embodiment.

Fig. 5 is a schematic diagram showing the structure of the transmission seat and the transmission rod in the disassembled state of the second embodiment, wherein the first helical part and the second helical part are regular helical teeth.

Fig. 5-1 is a schematic diagram showing the structure of the transmission seat and the transmission rod in the disassembled state of the second embodiment, wherein the first helical part and the second helical part are anti-helical teeth.

FIG. 6 shows a schematic structural view of the self-closing device of the third embodiment.

Fig. 7 is a schematic diagram showing the structure of the transmission seat and the transmission rod in the disassembled state of the third embodiment, wherein the first helical part and the second helical part are regular helical teeth.

Fig. 7-1 shows a schematic diagram of the structure of the transmission seat and the transmission rod in the disassembled state of the third embodiment, wherein the first helical part and the second helical part are anti-helical teeth.

FIG. 8 is a schematic structural diagram of the self-closing device of the fourth embodiment.

Fig. 9 is a schematic diagram showing the structure of the transmission seat and the transmission rod in the fourth embodiment in a disassembled state, wherein the first helical part and the second helical part are regular helical teeth.

Fig. 9-1 is a schematic diagram showing the structure of the transmission seat and the transmission rod in the fourth embodiment in a disassembled state, wherein the first helical part and the second helical part are anti-helical teeth.

Fig. 10 is a schematic structural diagram of the self-closing device of the fifth embodiment.

Fig. 11 is a schematic diagram showing the structure of the transmission seat and the transmission rod in the fifth embodiment in an exploded state.

detailed description

Embodiment one

Please refer to FIG. 1 , FIG. 2 and FIG. 3 , the lifting hinge device, such as the lifting self-closing device, includes an upper hinge 10 , a lower hinge 20 , a transmission seat 30 and a transmission rod 40 .

The upper hinge 10 includes an upper shaft sleeve 11 and an upper hinge piece 12 fixedly connected to the upper shaft sleeve 11 . The lower hinge 20 includes a lower shaft sleeve 21 and a lower hinge piece 22 fixedly connected to the lower shaft sleeve 21 . In this embodiment, the upper bushing 11 and the upper hinge piece 12 are of the same length and arranged flush with the ends, and the lower bushing 21 and the lower hinge piece 22 are of the same length and arranged with the ends flush with each other. The upper hinge piece and the lower hinge piece are provided with mounting holes for installing door panels or window panels.

The transmission seat 30 is adapted and fixed in the upper shaft sleeve 11. The adaptation is that the outer diameter of the transmission shaft corresponds to the inner diameter of the upper shaft sleeve. The surface of revolution is provided with a first helical portion 32 . The transmission rod 40 is fixedly connected in the lower shaft sleeve 21 , and a second helical part 42 is provided on the outer rotating surface of the transmission rod 40 . The first helical portion 32 and the second helical portion 42 are respectively a flange structure and a groove structure, or are respectively a groove structure and a flange structure. According to the needs, the helix part is single helix, double helix (two parallel helixes), triple helix, quadruple helix, five helix, hexa helix, seven helix, 8 helix, 9 helix, etc., preferably at least double helix, To enhance the supporting strength, the helix is, for example, a forward helix or a reverse helix. In a preferred embodiment, the central angle of the projection of the spiral along the axial direction is preferably less than 250 degrees. The transmission rod 40 is connected to the transmission cavity 31 , and the first helical part 32 and the second helical part 42 are engaged with each other. Among them: push the upper hinge 10 to make the upper hinge 10 rotate relative to the lower hinge 20, and the upper hinge 10 can be raised through the cooperation of the first helical part 32 and the second helical part 42; release the push to make the upper hinge 10 under gravity Falling under action, the upper hinge 10 can automatically reset and return to close through the cooperation of the first helical part 32 and the second helical part 42 . For example: if the upper hinge opens clockwise from 0 to 90 degrees relative to the lower hinge, and at the same time the upper hinge rises 9MM relative to the lower hinge. The hinge will drive the door leaf to close automatically and the door frame to close; if the upper hinge is opened to 175 degrees, and the upper hinge rises 17.5MM at the same time, the person who opens the door releases the doorknob, and the upper hinge falls 17.5MM, while The upper hinge will drive the door leaf to automatically close and the door frame to close. According to needs, the upper hinge is opened from 0 to 90 degrees relative to the lower hinge. At this time, the size can be designed and manufactured to rise to 4MM or 5MM or to 6MM, etc., and the doorknob is also released, and the upper hinge will drop 4MM Or 5MM or 6MM, the upper hinge will drive the door leaf to automatically close and the door frame to close. Those skilled in the art can decide to select positive or reverse spiral according to the left door opening, right door opening, or clockwise door opening, counterclockwise door opening, or automatic opening and automatic closing.

The lower part of the transmission seat 30 protrudes under the upper shaft sleeve 11, and the lower shaft sleeve 21 is adapted to be movably socketed outside the lower part of the transmission seat 30. In this embodiment, the transmission seat 30 is used to ensure the axes of the upper and lower shaft sleeves. In order to reduce the frictional force, preferably, a gasket 90 is arranged between the upper bushing 11 and the lower bushing 21 .

The transmission rod 40 is a revolving body structure and includes a solid seat 43 and a rod 41 fixed to the solid seat. The second helical part 42 is arranged at the rod 41, and the outer diameter of the solid seat 43 is larger than the outer diameter of the rod 41. , the solid seat 43 is fit and fixed in the lower bushing 21 .

In a preferred solution, the lower end of the transmission rod 40 is fixed with a plug seat 50, that is, the plug seat 50 is fixed on the solid seat 43, and the outer diameter of the plug seat 50 is greater than the outer diameter of the solid seat 43. 50 has an annular surface protruding from the solid seat 43, and the annular surface fits against the bottom end surface of the lower bushing 21, and the outer diameter of the plug seat 50 matches the outer diameter of the lower bushing 21. In addition, a plug 80 is provided to connect the upper port of the upper shaft sleeve.

Regarding the fixed connection between the transmission seat 30 and the upper shaft sleeve 11, for example, the following structure is adopted: the transmission seat 30 is provided with more than one screw hole, the upper shaft sleeve 11 is provided with more than one corresponding through hole, and a second screw hole is provided. A screw 60 passes through the through hole and is locked in the screw hole, so that the transmission seat 30 and the upper shaft sleeve 11 are affixed together; regarding the connection between the transmission rod 40 and the lower shaft sleeve 21, for example, the following Structure: the transmission rod 40 is provided with more than one screw hole, the lower bushing 21 is provided with more than one corresponding through hole, and a second screw 70 is provided to pass through the through hole and be locked in the screw hole, so as to drive the The rod 40 and the lower bushing 21 are fixed together.

Embodiment two

It differs from Embodiment 1 in that: please refer to Fig. 4, Fig. 5 and Fig. 5-1, the upper part of the fixed seat 43 protrudes above the lower bushing 21, and the upper bushing 11 is fitted and movably connected to the solid seat 43 upper part outside. The fixed seat 43 of the transmission rod 40 is used to ensure the accuracy of the rotation of the hinge device. The transmission seat 30 is adapted to be fixed in the upper shaft sleeve 11, and a plug seat 50 is fixed at the end of the transmission seat 30. The outer diameter of the plug seat 50 is larger than the outer diameter of the transmission seat 30. The annulus outside the seat 30, the annulus is adapted to lean against the top end surface of the upper bushing, and the outer diameter of the plug seat is compatible with the outer diameter of the upper bushing. The plug 80 is attached to the lower port of the lower sleeve.

Refer to Fig. 5, in which, the first helical part 32 and the second helical part 42 are regular helical teeth, and the transmission seat 30 is opened to drive the upper shaft sleeve 11, the upper hinge 12 and the relative lower hinge 22 to rotate and rise counterclockwise. . Please refer to Figure 5-1, in which, the first helical part 32 and the second helical part 42 are anti-helical teeth, and the transmission seat 30 is opened to drive the upper shaft sleeve 11 and the upper hinge 12 to be clockwise relative to the lower hinge 22 Turn up.

Embodiment Three

It differs from Embodiment 1 in that: please refer to Fig. 6, Fig. 7 and Fig. 7-1, the transmission rod 40 is fixedly connected in the upper shaft sleeve 11, and the outer rotating surface of the transmission rod 40 is provided with a second helical part 42. The transmission seat 30 is fixedly connected in the lower shaft sleeve 21 , the top surface of the transmission seat 30 is concavely provided with a transmission chamber 31 , and the inner rotating surface of the transmission chamber 31 is provided with a first helical part 32 . The upper part of the transmission seat 30 protrudes above the lower shaft sleeve 21, and the upper shaft sleeve is also movably sleeved outside the upper part of the transmission seat. The upper end of the transmission rod 40 is fixed with a plug seat 50, that is, the plug seat 50 is fixed on the solid seat 43, and the outer diameter of the plug seat 50 is greater than the outer diameter of the solid seat 43. The annulus outside the seat 43, the annulus is adapted to lean against the top end surface of the upper shaft sleeve, and the outer diameter of the plug seat is compatible with the outer diameter of the upper shaft sleeve. The lower port of the lower shaft sleeve is provided with a plug 80 . Among them, the first helical part 32 and the second helical part 42 in Fig. 7 are regular helical teeth, and the transmission rod 40 is opened to drive the upper shaft sleeve 11 and the upper hinge 12 to rotate counterclockwise relative to the lower hinge 22; Fig. 7 In -1, the first helical part 32 and the second helical part 42 are anti-helical teeth, and the transmission rod 40 is opened to drive the upper sleeve 11 and the upper hinge 12 to rotate clockwise and rise relative to the lower hinge 22 .

Embodiment four

It differs from Embodiment 3 in that: please refer to Fig. 8, Fig. 9 and Fig. 9-1, the lower part of the solid seat 43 protrudes under the upper bushing 11, and the lower bushing 21 is adapted to be movably connected to the solid seat 43. Seat 43 upper parts are outside. The fixed seat 43 of the transmission rod 40 is used to ensure the accuracy of the rotation of the hinge device. The transmission seat 30 is adapted and fixed in the lower shaft sleeve 21, and a plug seat 50 is fixed at the end of the transmission seat 30. The outer diameter of the plug seat 50 is larger than the outer diameter of the transmission seat 30, and the plug seat 50 has a 30 outer annulus, the annulus fits against the bottom end face of the lower bushing, and the outer diameter of the plug seat is compatible with the outer diameter of the lower bushing. The upper port of the upper shaft sleeve is provided with a plug 80 . Wherein, in FIG. 9 , the first helix 32 and the second helix 42 are regular helical teeth, and the transmission rod 40 is opened to drive the upper sleeve 11 and the upper hinge 12 to rotate counterclockwise relative to the lower hinge 22 to rise. In Fig. 9-1, the first helical part 32 and the second helical part 42 are anti-helical teeth, and the transmission rod 40 is opened to drive the upper sleeve 11 and the upper hinge 12 to rotate clockwise and rise relative to the lower hinge 22 .

Embodiment four

It differs from the third embodiment in that: please refer to FIG. 10 and FIG. 11 , the upper hinge 10 includes an upper shaft sleeve 11 and an upper hinge piece 12 fixedly connected to the upper shaft sleeve 11 . The lower hinge 20 includes a lower shaft sleeve 21 and a lower hinge piece 22 fixedly connected to the lower shaft sleeve 21 . In this embodiment, the upper sleeve 11 is fixedly connected to the upper half of the upper hinge piece 12; the lower sleeve 21 is fixedly connected to the lower half of the lower hinge piece 22; Above; the upper hinge piece 12 and the lower hinge piece 22 are aligned and arranged with equal lengths. In this embodiment, the upper hinge rotates to 180 degrees relative to the lower hinge, and the upper hinge rises about 13 mm in the axial direction relative to the lower hinge.

The above is only a preferred embodiment of the present invention, so the scope of the present invention cannot be limited accordingly, that is, the equivalent changes and modifications made according to the patent scope of the present invention and the content of the specification should still be covered by the present invention within range.

Claims (10)

1. rising hinge device, including:

Hinge on one, including Upper shaft sleeve and the upper leaf of hinge of affixed Upper shaft sleeve；

One lower jaw, including the lower jaw sheet of Lower shaft sleeve and affixed Lower shaft sleeve；

It is characterized in that: also include:

One retainer, affixed Upper shaft sleeve, this retainer bottom face is arranged with drive cavity, and within this drive cavity, the surface of revolution is provided with first Spiral part；And

One drive link, affixed Lower shaft sleeve, outside this drive link, the surface of revolution is provided with the second spiral part, and this drive link is connected to transmission Intracavity, this first spiral part and the engagement of the second spiral part adaptation, wherein: in promotion, hinge makes hinge turn relative to lower jaw Dynamic, coordinated by the first spiral part and the second spiral part and upper hinge can be made to increase；Pine oil promotes and makes hinge make at gravity Use decline, coordinated by the first spiral part and the second spiral part and upper hinge can be made to automatically reset；This first spiral part, Second spiral part is all at least double-spiral structure, and this at least double-spiral structure includes at least two parallel helixes.

Rising hinge device the most according to claim 1, it is characterised in that: this retainer lower part stretches out Upper shaft sleeve, should Lower shaft sleeve adaptation is actively socketed on outside retainer lower part.

Rising hinge device the most according to claim 1, it is characterised in that: this drive link is rotary structure and includes one Gu seat and the rod member of an affixed solid seat, this second spiral part is located at rod member, and this solid seat external diameter is more than rod member external diameter, this solid seat Adaptation is fixed in Lower shaft sleeve.

Rising hinge device the most according to claim 3, it is characterised in that: this solid seat upper part stretches out Lower shaft sleeve, on this Axle sleeve adaptation is actively socketed on outside solid seat upper part.

5. according to the rising hinge device described in claim 1 or 2 or 3 or 4, it is characterised in that: this first spiral part and Two spiral parts are respectively flanged structure and groove structure, or, respectively groove structure and flanged structure.

6. rising hinge device, including:

Hinge on one, including Upper shaft sleeve and the upper leaf of hinge of affixed Upper shaft sleeve；

One lower jaw, including the lower jaw sheet of Lower shaft sleeve and affixed Lower shaft sleeve；

It is characterized in that: also include:

One drive link, affixed Upper shaft sleeve, outside this drive link, the surface of revolution is provided with the second spiral part；And

One retainer, affixed Lower shaft sleeve, this retainer top end face is arranged with drive cavity, and within this drive cavity, the surface of revolution is provided with first Spiral part；This drive link is connected in drive cavity, this first spiral part and the engagement of the second spiral part adaptation, wherein: push away Dynamic upper hinge makes hinge rotate relative to lower jaw, is coordinated by the first spiral part and the second spiral part and can make on upper hinge Rise；Pine oil promotes and makes hinge decline under gravity, is coordinated can be made by the first spiral part and the second spiral part Hinge automatically resets；This first spiral part, the second spiral part are all at least double-spiral structure, this at least double-spiral structure bag Include at least two parallel helixes.

Rising hinge device the most according to claim 6, it is characterised in that: this retainer upper part stretches out Lower shaft sleeve, should Upper shaft sleeve is also actively socketed on outside retainer upper part.

Rising hinge device the most according to claim 6, it is characterised in that: this drive link is rotary structure and includes one Gu seat and the rod member of an affixed solid seat, this second spiral part is located at rod member, and this solid seat external diameter is more than rod member external diameter, this solid seat Adaptation is fixed in Upper shaft sleeve.

Rising hinge device the most according to claim 8, it is characterised in that: this solid seat lower part stretches out Upper shaft sleeve, under this Axle sleeve adaptation is actively socketed on outside solid seat lower part.

10. according to the rising hinge device described in claim 6 or 7 or 8 or 9 requirement, it is characterised in that: this first spiral part It is respectively flanged structure and groove structure with the second spiral part, or, respectively groove structure and flanged structure.