CN100471717C

CN100471717C - Hing mechanism and vehicle seat with the mechanism

Info

Publication number: CN100471717C
Application number: CNB2005100714252A
Authority: CN
Inventors: 罗希·勒内
Original assignee: Faurecia Sieges dAutomobile SAS
Current assignee: Faurecia Sieges dAutomobile SAS
Priority date: 2004-05-06
Filing date: 2005-05-08
Publication date: 2009-03-25
Anticipated expiration: 2025-05-08
Also published as: JP2005324039A; DE102005021092B4; JP4221395B2; FR2869847A1; DE102005021092A1; CN1693113A; FR2869847B1

Abstract

The hinge mechanism comprises two sets of teeth 11, 12 coming into mutual engagement, and a reinforcing set of teeth 22 secured to the first set of teeth 11 and disposed set back slightly from the first set of teeth. Consequently, the second set of teeth 12 does not normally come into contact with the reinforcing set of teeth.

Description

A kind of linkage and comprise the seat of this mechanism

Technical field

The present invention relates to linkage.

Particularly, the present invention relates to a kind of linkage, it can make first and second parts of seat can relatively carry out angular adjustment, said mechanism comprises first and second rigid strutting pieces, it connects with each parts of above-mentioned first and second seat components (directly or with other different mode), by a coupling device above-mentioned first and second strut members are connected together, this coupling device is suitable for causing that first and second strut members relative to each other rotate, above-mentioned coupling device comprises at least one first group of tooth and second group of tooth, these two groups of teeth respectively with first and second strut members machinery coupling (directly or indirectly), first and second groups of teeth include a plurality of teeth, and this tooth is suitable for forming mutual engagement.

Background technology

File FR-A-2759333 has described the example of this linkage with very good effect.

The content of invention

Specific purposes of the present invention are further to strengthen the intensity of linkage as mentioned above and/or obtain high-intensity operability under the situation that does not reduce precision.

For realizing this purpose, according to the present invention, such linkage of discussing is characterized in that, also comprises at least one tension member that is fixed on first group of tooth, and described tension member has a plurality of reinforcement teeth, each is strengthened on the tooth that tooth all is placed on first group of tooth, after the placement of this reinforcement tooth is leaned on a little with respect to the tooth of first group of tooth a bit, like this, in normal work period, have only when first group of tooth meshes between each reinforcement tooth, second group of tooth just meshes with the tooth formation of first group of tooth; And wherein use the bigger material manufacture tension member of intensity than the material of first group of tooth.

Should be noted that and give an example that above-mentioned tension member can be:

-be installed in independent ring or plate on the cheek, wherein this cheek constitutes described first strut member, and this cheek itself directly is fixed on first seat component;

-for example, described first strut member itself constitutes the cheek be fixed on first seat component, be then to form this first group of tooth being installed on independent ring on the cheek or the plate;

-independent the ring or the plate that are installed on the planetary wheel has two groups of teeth, and this tooth just thinks then that by one group of tooth engagement on the inward turning gear (hypocycloid gear) that forms and first strut member first group of tooth is a group in the planetary multiple sets of teeth; Perhaps other

-in having planetary linkage, above-mentioned tension member can be a planetary wheel itself also, and first group of tooth is one group of independent tooth installing on the above-mentioned planetary wheel.

By these measures, this group is strengthened the intensity that tooth just can strengthen hinge, also might form above-mentioned reinforcement tooth, and its requirement to the production tolerance does not have the requirement of tolerance of first group of tooth so strict (for example, if it is the part of hardening by heat treatment that this group is strengthened tooth), but need not reduce by first and second groups of accuracy of meshs between the tooth, and also can not reduce the performance accuracy of linkage like this.

Especially, it can also be the part of hardening through bakingout process at least that this group is strengthened tooth, and, although the heat treatment meeting produces distortion, in the linkage that is obtained, the shape of described tooth can be with very accurate way formation engagement each other normally, so just might obtain mechanism's engagement of pinpoint accuracy between first and second strut members.

When needing linkage to bear unusual torque, as when the vehicle that seat wherein is installed is collided, first group of tooth will deform, strengthen tooth up to second group of tooth and first group of tooth and this group and all form engagement, therefore should just can make linkage withstand effect torque thereon by group reinforcement tooth.

In the different embodiment of linkage of the present invention, any one all may use one or more in the following measure:

-tension member is to be made by the metal that hardens through bakingout process at least, and first group of tooth is by making without the metal of bakingout process sclerosis;

-with respect to first group of tooth, a bit, distance was that 0.01 millimeter (mm) is to 0.1 millimeter after the reinforcement tooth was placed and must be leaned on;

The tooth of-the first group of tooth has certain height, with respect to the tooth of first group of tooth strengthen tooth put lean on after a bit, distance be first group of tooth tooth depth 0.2% to 0.3%;

-the first group of tooth is a complete annular, and strengthening tooth also is a complete annular, and it is concentric with first group of tooth;

-this tension member is flat ring, and it has the outward flange of non-circular symmetry, and above-mentioned ring meshes into to have in the pit of respective shapes on first strut member;

-strengthen tooth number and first group of tooth in the number of tooth identical, all place each tooth in first group of tooth to such an extent that align with the reinforcement tooth;

-the first and second groups of teeth all are circular and form an inward turning gear, this linkage also comprises an eccentric driving part, laying it makes it possible to rotate on pivot with respect to first strut member around first rotating shaft, and be suitable for driving second group of tooth when eccentric driving part is rotated around second that setovers with respect to primary shaft, this second round described primary shaft nutating;

-the first and second groups of teeth are respectively fixed on first and second strut members;

-the first group of tooth is fixed on first strut member, and second group of tooth is fixed on the planetary wheel, this planetary wheel is supporting the 3rd group of tooth, the 3rd group of tooth also be circular and with second group of tooth be concentric, by forming the inward turning gear, described the 3rd group of tooth and the 4th group of annular tooth form engagement, and the 4th group of annular tooth is concentric with first group of tooth; And

-the first group of tooth is fixed on first strut member, second group of tooth is fixed on the rod, this rod and the engagement of the second strut member mechanism, and lay it to such an extent that it can be moved between latched position and non-locked position, at first in latched position, the tooth of the tooth of second group of tooth and first group of tooth forms engagement, secondly the tooth of second group of tooth does not mesh with the tooth formation of first group of tooth in non-locked position, this linkage also comprises a control setup, it has a cam, and this cam is suitable for making rod to move selectively between latched position and non-locked position.

The present invention also provides a kind of seat, comprises first and second parts, its by at least one as above institute's linkage can carry out angular adjustment.

After the description of having read the relevant embodiment in back, other characteristic of the present invention and advantage can become more clear, and these embodiment are nonrestrictive embodiment and are in conjunction with the accompanying drawings embodiment to be described.

Description of drawings

Fig. 1 is to use the sketch of seat of first embodiment of linkage of the present invention;

Fig. 2 is in the first embodiment of the present invention, the cross sectional drawing of the embodiment of linkage, and wherein this linkage can be assemblied on the seat among Fig. 1;

Fig. 3 is the planar view of cheek of the linkage of Fig. 2;

Fig. 4 is one the planar view that is fixed to the tension member on the cheek of Fig. 3;

Fig. 5 is local details drawing, has represented the engagement with the tooth of the hinge of Fig. 2;

Fig. 6 and 7 is the cross sectional drawings of first cheek with linkage of tension member, has two places different with the first embodiment of the present invention;

Fig. 8 is the 3rd view that changes of the first embodiment of the present invention similar to Fig. 2;

Fig. 9 is the view of the second embodiment of the present invention similar to Fig. 1;

Figure 10 and 11 is respectively the part sectional view and the cross sectional drawing of linkage, and wherein this linkage can be assemblied on the seat among Fig. 9;

Figure 12 is an enlarged drawing, and it has represented the part details of one group of tooth of the mechanism of Figure 10 and 11.

In different accompanying drawings, similar Reference numeral is represented same or similar element.

The specific embodiment

Fig. 1 has represented an automobile seat 1, as front stall, comprises seat main body 2, and it is by being installed on the floor 3 of vehicle as rail set 4.

Seat 1 also comprises back of seat 5,, by for example linkage 6 of turn knob 7 controls back of seat 5 pivotally is installed on the seat main body 2 by at least one, and this pivoted is carried out around transverse horizontal axis Y1.As shown in Figure 2, linkage 6 comprises first and

second strut members

8,9, for example it can be the form of two steel plate cheeks, these two cheeks with the direction of axle Y1 quadrature on one place against another ground, and be respectively fixed on the framework of the framework of back of seat 5 and seat main body 2.

By wavestrip (not shown) or other any

known devices cheek

8,9 is secured together, wherein this known devices might relatively rotate two cheeks.

By the coupling device 10 with one group of

tooth cheek

8,9 is connected to each other, this coupling device is made up of the single-row inward turning gear with two groups of

teeth

11,12 in this embodiment.

First group of tooth 11 formed by the circular arc of centre on axle Y1, and in this embodiment, described first group of tooth formed a complete circle, and the center of circle is on axle Y1, and is and radially inside.In this embodiment, though the described first group of tooth and first cheek 8 form an integral body, also it can be formed at gear inside, this gear and first cheek 8 are supporting, and rigidly fix thereon, as described in file FR-A-2759333.

Second group of tooth 12 is to form one group of circular tooth, its center of circle is on transverse horizontal axis Y2, this axle a little is offset with respect to axle Y1, in this embodiment, the second group of tooth 12 and second cheek 9 form an integral body, and radially outward, described second group of tooth and first group of tooth 11 form engagement, and its external diameter is littler than the internal diameter of first group of tooth 11.

This linkage 6 also comprises an eccentric driving part 13, and in this embodiment, it comprises a rigidity cam, with a control stalk 14 this cam is fixed on the button 7.Above-mentioned cam 13 comprises:

At first, the first circular symmetry bearing surface 15, the center of circle is installed to its rotation in the bearing 16 on axle Y1, and this bearing 16 is parts of first cheek 8; And

The second, the second circular cylinder shape bearing surface 17, center are on axle Y2, and rotation is installed in the bearing 18 of second cheek 9.

Like this, determine turn knob 7 and cam as its essence.13 will make cheek 9 rotate on pivot with respect to cheek 8, and when these actions were appreciiable in reference system when, axle Y2 was under axle Y1, and wherein this reference system is static with respect to first cheek 8.

As shown in Fig. 2 to 5, in order to increase the intensity of linkage 6, in first cheek 8, have torus section 19 around first group of tooth 11, this torus section has jagged outward flange 20, and the tension member 21 and the described passage of formative gear ring are supporting.Described tension member 21 extends in the plate, this plate is parallel with first cheek 8, the heart has one group of reinforcement tooth 22 therein, its outside has jagged edge 23, this edge has and jagged edge 20 corresponding shapes, and the protruding 23a of zig-zag outward flange 23 meshes among the corresponding pit 20a in the edge 20 into (Fig. 5).

As shown in Figure 2, described group of tooth 22 overlaps on the described group of tooth 11, the thickness e 1 of second group of tooth 12 strengthen no better than tooth 22 and first group of tooth 11 thickness and.For example should organize the thickness e 2 of strengthening tooth can be in 0.2 times to 0.4 times scope of thickness e 1, as approximately being 1/3rd of thickness e 1.

In addition, more details as shown in Figure 5, the reinforcement tooth 22a of tooth 22 aligns with each tooth 11a of each first group of tooth 11.The number of tooth 22a can be littler than the number of tooth 11a.But in the embodiment shown in the figures, the number that this group is strengthened the tooth 22a of tooth equates with the number of the tooth 11a of first group of tooth 11, and described tooth is that alignment is provided with.

With respect to the tooth 11a of first group of tooth, the reinforcement tooth 22a of tooth 22 place lean on a little after, so when normal when using seat 1, described reinforcement tooth 22a can not contact with the tooth 12a of second tooth.

For example, with respect to tooth 11a, the distance after reinforcement tooth 22a is inclined to one side hThe chances are the height H of

tooth

11a, 12a 0.2% to 0.3 between.For example, the distance after partially hCan approximately be 0.05mm at 0.01mm between the 0.1mm.

Tension member 21 is made by the big material of intensity of intensity (particularly hardness) material more used than first cheek 8.For example, first cheek 8 can be made by the high elastic limit steel without overheated chemicosolidifying, and tension member 21 then can be made by the steel of crossing through hot chemical treatment.In this case, although because hot chemical treatment can cause distortion, because only can forming with the tooth 11 of first group of tooth usually, the tooth 12a of second group of tooth contacts, so inward turning gear 10 still can keep good precision.

Have only when needs linkage 6 bears unusual torque, as when vehicle is collided, the tooth 11a of first group of tooth just can flatten a bit a little, so the tooth 12a of second group of tooth all contacts with the reinforcement tooth 22a that described tooth 11a and this group are strengthened tooth.This group reinforcement tooth 22 just might bear the top unusual torque of being mentioned then, therefore just can make linkage 6 through can standing this opposite extreme situations.

It should be noted that, strengthen tooth by this group, second group of tooth 12 also can be strengthened itself, this strengthens to this group described above, and tooth 22 is similar (strengthens the mode of first group of tooth 11 by a substitute, or except that this any means that adds the strong method), just strengthen tooth with above-mentioned group then and be fixed on the ring or with this ring and form an integral body, wherein this ring is fixed on second cheek 9, and next this group reinforcement tooth carries out work to strengthen the identical mode of tooth 22 with top described ancestral.

In addition, shown in Fig. 6 and 7, being fixed in the passage 19 is not a ring, but the reinforcement 21 of a steel plate, as, it has almost covered the whole zone of first cheek 8, and as is soldered on it with laser welding.In the embodiment shown in fig. 6, it welds with transparent weldering (transparencywelding).

In embodiment as shown in Figure 7, tension member has hole 21a and/or hole 21b, pass the part 8a that hole 21a stamps out the first cheek passage, the pin 8b on the first cheek passage passes hole 21b, and above-mentioned part that stamps out and/or pin are welded on the tension member 21.In the time of in tension member 21 being fixed on the above-mentioned corner plate and first cheek 8, also a corner plate 24 can be welded on the part 8a that stamps out.

In addition, can also strengthen tooth 22 to placing this group towards the outer shaft of mechanism, rather than first group of tooth 11:

Or because described should the group strengthened tooth 22 and first cheek, 8 formation one, wherein next this cheek 8 has been formed tension member, just first group of tooth is made after the reason in the independently plate or ring that is installed on first cheek;

Or because described this group strengthens tooth 22 and first group of tooth 11 belongs to two independently ring gear or plates, wherein this ring gear or plate overlap each other and fix, and it is also overlapping with first cheek 8, and fixed thereon, the ring gear that will have first group of tooth 11 then inserts second cheek 9 and has this group to be strengthened between the ring gear of tooth 22.

In variation shown in Figure 8, connecting device 10 is the planet inward turning gears with planetary wheel 25, wherein are connected in this connecting device and first and

second cheeks

8,9, and planetary wheel 25 has neck bearing 26, the cylindrical bearing surface 17 of this neck bearing and cam 13 is supporting, and its center of circle is on axle Y2.

On profile, planetary wheel 25 has two groups of teeth:

Top second group of tooth 12 mentioning, its need not be fixed to again on second cheek 9 or with its formation one; With

The 3rd group of tooth 27, it is concentric with second group of tooth 12, but have different diameters, and here among the embodiment of indication, it has bigger diameter.

The 3rd group of tooth 27 and the 4th group of tooth 28 engagements, wherein the 4th group of profile of tooth is formed in second cheek 9, and radially inside, has the big internal diameter of external diameter than the 3rd group of tooth 27.

Described the 4th group of tooth 28 is concentric with first group of tooth 11, and first group of tooth as described, it also can be strengthened it by the tension member 29 of annular, form one with reinforcement tooth 30, be fixed on second cheek 9, as utilize be engaged on snugly as described in the passage 31 of second cheek, contact with the tension member 21 of first cheek 8 and/or described first cheek.

Tension member 29 and this group are strengthened the tension member 21 of tooth 30 and first cheek 8 and this group to strengthen tooth 22 similar, strengthen described in front all contents of tooth 22 with regard to tension member 21 and it one group and all can be used for tension member 29 and its one group of reinforcement tooth 30.

Should be noted that in variation shown in Figure 8, this group can be strengthened tooth and be fixed to arbitrarily on the planetary wheel 25.In this case, this group strengthen tooth can be installed in annular on the planetary wheel 25 and be integral or form one with described planetary wheel 25.With respect to " normally " tooth on the planetary wheel (forming one or mounted thereto with described planetary wheel), described reinforcement tooth is placed by the back.

In the second embodiment of the present invention, as shown in FIGS. 9 to 11, seat 1 as mentioned above, but activate the angle displacement that its button 107 (Fig. 9) can not cause any back of seat 5 reality: activator button 107 only unclamps seat back 5, so that it can rotate on pivot, by directly acting on the action of the user on the described back of seat, make described back of seat can carry out angular adjustment then.

In this case, for example, the linkage 106 that is activated by button 107 can be the sort of type shown in Figure 10 and 11, and it comprises:

First cheek 108 is made by steel plate, and shape is circular usually, and Y1 is vertical with rotating shaft;

Second cheek 109 is made by steel plate, and shape also is circular usually, Y1 is vertical with axle, first and second cheeks are installed, one of them can be pivoted with respect to another around axle Y1, for example place the becket 109a that purses up outward and install by two cheeks; With

A coupling device 110 is coupled together first and second cheeks 109,110.

This coupling device 110 is the coupling devices with rod, and it comprises:

-the first group of tooth 111 is fixed on first cheek 108, and the center of circle is positioned on the Y1, and in this embodiment, itself and first cheek 108 form one;

-one or more excellent 113, each is all supporting radially outer second group of tooth 112, all installs each rod to such an extent that it can be moved with respect to second cheek 109 between the position below:

The latched position (not shown), in this position, one group of tooth 112 of described bar and first group of tooth of first cheek 111 form engagement; And

Non-locked position (shown in Figure 10 and 11), in this position, one group of tooth 112 of rod does not mesh with first group of tooth 111; Among the mentioned here embodiment, each rod 113 is installed it all can be radially slided in guide rail 114, this guide rail 114 and second cheek 109 form one; With

-one cam control gear at first comprises a cam 115, its be fixed on that actuating spindle 107a goes up or with its formation one, and be fixed on the button 107 and optional control desk 116, it is fixed on the cam 115; By one or more springs 117, elasticity advances cam 115 towards dead position, in this dead position, described cam promotes rod 113 and radially outward moves, be in latched position up to them, and control loop 116 has towards each excellent internal cutting off 116a, cut off ingear pin 118 therein, it is the part of corresponding rod 113, form the outward flange that cuts off 116a, so that when activator button 107, make cutting action on pin 118 by moving corresponding rod 113, be positioned at non-locked position up to it.

Such linkage 106 is known and in a lot of files description is arranged, as file FR-A-2740406.

In the present invention, shown in Figure 10 to 12, also have a tension member 121, it is fixed on first group of tooth 111, and itself also has one group of radially inner reinforcement tooth 122.In the embodiment shown in the figures, form tension member 121 by planar circular, it extends on the plane vertical with axle Y1, and meshes snugly in the passage 119 that advances to be formed in first cheek, 108 surfaces, and wherein this cheek 108 is placed facing to second cheek 109.Method by projection 123a can be strengthened member 121 in passage 119 the bearing fit engagement, wherein this protrusion-shaped is formed in the outward flange 123 of tension member, and among the respective dimple 120a in the outward flange 120 of engagement stand in channel 119, shown in the embodiment of Fig. 2 in Fig. 5.

By any other known method,, tension member 121 can both be fixed on first group of tooth 111 as welding.

Measure the thickness that this group is strengthened tooth 122 along axle Y1, as can being 0.2 times to 0.4 times of thickness of this group tooth 112 on rod, as, approximately be this group tooth on rod thickness 1/3rd.

In addition, more details as shown in figure 12, each in this group tooth 122 strengthened tooth 122a and all alignd with the tooth 111a of first group of tooth, and for example their number also can equate with the number of the tooth of described first group of tooth.Green phase will be strengthened tooth 122a a little by back one segment distance h for the tooth 111a of first group of tooth, and the tooth 112a of one group of tooth on rod is normally only contacted with the tooth 111a formation of first group of tooth.For example, the distance h after leaning on respect to the reinforcement tooth 122a of tooth 111a can be positioned at 0.2% to 0.3% scope of the height H that approximately is tooth 111a, 122a, particularly can greatly about 0.01mm in the scope of 0.1mm, for example, be approximately 0.05mm.

Tension member 121 is made by the big material of intensity of intensity (particularly hardness) material more used than first cheek 108.For example, first cheek 108 can be made by the high elastic limit steel without overheated chemicosolidifying, and tension member 121 then can be made by the steel of crossing through hot chemical treatment.In this case, although because hot chemical treatment can cause distortion, because the tooth 112a on the rod only can contact with the tooth 111a formation of first group of tooth under the normality condition, so blocking device 110 still can keep good precision.Have only when linkage 106 must bear unusual torque, at the tooth 111a of first group of tooth under the influence of described unusual torque a little under some situation about flattening, the tooth 112a of rod could with strengthen tooth 122a and form and contact.This group reinforcement tooth 122 is held can stand above-mentioned torque, this just makes linkage 106 might hold out against this limiting case.

Claims

1. linkage, it can make first and second parts (2,5) of seat relative to each other carry out angular adjustment; Described mechanism comprises first and second rigid strutting pieces (8,9; 108,109), it is connected respectively to first and second seat components, by coupling device (10; 110) described first and second strut members are connected together, regulate this coupling device first and second strut members are relative to each other rotated; Described coupling device comprises at least the first group tooth (11; 111) and second group of tooth (12; 112), its respectively with first and second strut members (8,9; 108,109) mechanical connection, first and second groups of teeth include a plurality of teeth (11a, 12a; 111a, 112a), this tooth is suitable for forming mutual engagement;

Described linkage is characterized in that, also comprises at least one tension member (21; 121), it is fixed to first group of tooth (11; 111) on, described tension member has a plurality of reinforcement tooth (22a; 122a), each tooth all is positioned at the tooth (11a of first group of tooth; 111a), with respect to the tooth (11a of first group of tooth; 111a), strengthen tooth lay lean on a little after a bit, like this in normal work period, when strengthening tooth (22a; When meshing 122a), the tooth (12a of second group of tooth; 112a) only with the tooth (11a of first group of tooth; 111a) form contact; In this case, use the material bigger to make tension member (21 than the strength of material of first group of tooth; 29; 121).

2. linkage as claimed in claim 1 is characterized in that, tension member (21; 121) by making first group of tooth (11 through the metal of bakingout process sclerosis at least; 111) by making without the metal of heat treatment sclerosis.

3. linkage as claimed in claim 1 is characterized in that the tooth (11a with respect to first group of tooth; 111a), strengthen tooth (22a; 122a) put lean on after, the distance after leaning on (h) is positioned at the scope of 0.01mm to 0.1mm.

4. linkage as claimed in claim 1 is characterized in that the tooth (11a of first group of tooth; 111a) have certain height (H),, strengthen tooth (22a with respect to the tooth of first group of tooth; 122a) put lean on after, the distance after leaning on (h) is positioned at 0.2% to 0.3% scope of the tooth depth of first group of tooth.

5. linkage as claimed in claim 1 is characterized in that, first group of tooth (11; 111) be a complete circle, and strengthen tooth (22a; 122a) also be a complete circle, it is concentric with first group of tooth.

6. linkage as claimed in claim 1 is characterized in that, tension member (21; 29; 121) be flat ring, it has the outward flange (23 of non-circular symmetry; 123), described ring is at first strut member (8; The pit (19 of the respective shapes 108); 31; 191) mesh in.

7. linkage as claimed in claim 1 is characterized in that, strengthens tooth (22a; Tooth (the 11a of number 122a) and first group of tooth; Number 111a) is identical, each tooth of first group of tooth all with strengthen the tooth placement of aliging.

8. linkage as claimed in claim 1 is characterized in that, first and second groups of teeth (11; 12) be circular, and form the inward turning gear, this linkage also comprises an eccentric drive element (13), this eccentric drive element is installed to make it center on first rotating shaft (Y1) to pivot with respect to first strut member (8), and it is adjusted to drive second group of tooth (12) and rotate around second (Y2), second has center displacement with respect to above-mentioned primary shaft, and second round described primary shaft nutating.

9. linkage as claimed in claim 8 is characterized in that, first and second groups of teeth (11,12) are connected respectively on first and second strut members (8,9).

10. linkage as claimed in claim 8, it is characterized in that, first group of tooth (11) is fixed on first strut member (8), and second group of tooth (12) is fixed on the planetary wheel (25), this planetary wheel is also supporting the 3rd group of tooth (27), and the 3rd group of tooth is circle and concentric with second group of tooth (12), by forming the inward turning gear, the engagement of the tooth (28) of described the 3rd group of tooth formation and the 4th group of circle, the 4th group of tooth is concentric with first group of tooth (11).

11. linkage as claimed in claim 1, it is characterized in that, first group of tooth (11) is fixed on first strut member (8), and second group of tooth (112) is fixed on the rod (113), this rod is connected with second strut member (109) mechanism, and this rod is installed it can be moved between latched position and non-locked position, at first under the situation of latched position, the tooth of second group of tooth (112a) and the, the tooth of one group of tooth (111a) forms engagement; Secondly under the situation of non-locked position, the tooth of second group of tooth not with the engagement of the tooth of first group of tooth, this linkage also comprises a control setup, it has a cam (115,116,117), and this cam is suitable for making rod (113) to move selectively between its latched position and non-locked position.

12. a seat, it has first and second parts (2,5), can be by at least one according to the described linkage (6 of the arbitrary claim in front; 106) carry out angular adjustment.