CN214760159U - Angle adjusting mechanism and seat frame and seat thereof - Google Patents

Abstract

The utility model relates to an angle adjusting mechanism, which comprises an installation shaft, a first rotating part and a second rotating part, wherein the first rotating part and the second rotating part are sleeved on the installation shaft; the first rotating part and the second rotating part are both provided with inner ratchet rims which are coaxial with the mounting shaft and can rotate relative to the mounting shaft; two sets of mounting grooves distributed along the axial direction are arranged on the mounting shaft, and pawl parts matched with the inner ratchet ring are respectively arranged in the mounting grooves; an elastic piece for pushing the pawl part to keep engaged with the inner ratchet ring is arranged in the mounting groove. Through angle adjustment mechanism's first rotation portion and second rotation portion effect, the back and seat support homoenergetic carry out the free regulation of angle as required user's needs, improve user's comfort. In addition, the first rotating part and the second rotating part are respectively subjected to angle adjustment through the ratchet wheel and pawl structure and reset through the reset ring structure, so that the mechanical structure is simpler, the production assembly is facilitated, and the production cost is reduced.

Description

Angle adjusting mechanism and seat frame and seat thereof

Technical Field

The utility model relates to a seat field, more specifically relates to an angle adjustment mechanism and seat frame and seat thereof.

Background

The chair is an important tool for people to work and rest and generally comprises a chair seat, chair legs and a backrest. A plurality of existing chairs with the function of adjusting the angle of the backrest enable the backrest to rotate within a certain angle range. However, as disclosed in chinese patent document No. CN104161405A, published as 2014, 11 and 26, discloses a seat back angle adjustment device, which includes a fixing frame and a rotating frame, an end of the fixing frame is rotatably connected to an end of the rotating frame via a pin, a pawl connected to a pin on the fixing frame is matched with a gear tooth on the end of the rotating frame to form a ratchet positioning mechanism, an end of the rotating frame is connected to a pin, the positioning plate includes three peripheral arc surfaces with different radii, a first arc surface with the smallest radius and a notch formed by positioning plate bodies at two ends of the first arc surface are in sliding fit with a stopper on the rotating frame, a second arc surface with a radius smaller than the radius of the gear tooth, a third arc surface with a radius larger than the radius of the gear tooth is in sliding fit with the pawl in a section of travel of the positioning plate, and a return spring is mounted on the pawl. After the seat backrest angle adjusting device is adopted, the angle of the backrest of the seat can be adjusted in a large range when the seat backrest is used, and an individual can select the optimal angle.

However, in the above technical solutions, the seat is fixed and not adjustable, so that the user cannot adjust the angle of the seat according to his own needs, and the use is limited. In addition, the adjusting device can adjust back and forth between different angles, the ratchet and pawl are controlled by arranging the positioning pieces with three different cambered surfaces, and the structure of the parts is complex.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome the problem that seat support angle can not be adjusted among the above-mentioned prior art, provide an angle adjustment mechanism and seat frame and seat thereof, back and seat support homoenergetic carry out the regulation of certain angle for the user can adjust back or seat support according to self needs, improves the comfort.

In order to solve the technical problem, the utility model discloses a technical scheme is: an angle adjusting mechanism comprises an installation shaft, a first rotating part and a second rotating part, wherein the first rotating part and the second rotating part are sleeved on the installation shaft; the first rotating part and the second rotating part are both provided with inner ratchet rims which are coaxial with the mounting shaft and can rotate relative to the mounting shaft; two groups of mounting grooves distributed along the axial direction are arranged on the mounting shaft, and pawl parts matched with the inner ratchet ring are respectively arranged in the mounting grooves; an elastic piece for pushing the pawl part to keep engaged with the inner ratchet ring is arranged in the mounting groove.

In the technical scheme, the first rotating portion and the second rotating portion are respectively connected with the backrest and the seat, when the backrest needs to be rotated, the first rotating portion rotates relative to the installation shaft, the inner ratchet ring is meshed with the pawl portion, the first rotating portion can rotate for a certain angle in one direction, and the elastic piece can enable the pawl portion to be kept in a meshed state with the inner ratchet ring, so that the stability of the backrest is guaranteed. When the chair seat needs to be rotated, the same as the backrest is rotated, and the difference is that the rotation angles are opposite.

Preferably, the mechanical hand further comprises a first reset ring and a second reset ring sleeved on the mounting shaft, the first reset ring and the second reset ring can rotate around the mounting shaft, and the first reset ring and the second reset ring respectively correspond to the first rotating part and the second rotating part; the width of the pawl part is larger than that of the inner ratchet ring, and the inner rings of the first reset ring and the second reset ring are provided with a plurality of limiting notch parts for accommodating the pawl part; the outer rings of the first reset ring and the second reset ring are provided with angle reset gap parts; the first rotating portion and the second rotating portion are provided with limiting strips used for the angle resetting notch portion to move. When first rotation portion rotated, the spacing strip of first rotation portion moved on angle breach portion that resets, and when spacing strip removed to the extreme position of angle breach portion that resets, first rotation portion continued to move and can drive first reset ring and rotate together. When the first reset ring rotates, the limiting notch part can rotate relative to the pawl part, so that the pawl part is separated from the limiting notch part and is abutted against the inner ring of the first reset ring, the pawl part is not meshed with the inner ratchet ring, the first rotating part can reset at the moment until the limiting strip reaches the limit position in the other direction of the angle resetting notch part, and the first reset ring is driven to rotate to enable the pawl part to enter the limiting notch part again and to be meshed with the inner ratchet ring again, and resetting of the first rotating part is achieved. The angle that first rotation portion can rotate is decided by the arc length of angle reset breach portion and the initial position of spacing. The reset of the second rotating part is consistent with the reset of the first rotating part, and the difference is that the initial position of the limiting strip is different and the rotating direction is opposite.

Preferably, further comprises a fixing ring member; the fixing ring component comprises a first ring part and a second ring part which are respectively arranged at two ends of the mounting shaft; the one end of installation axle is provided with spacing arch, first ring portion be provided with spacing protruding complex spacing groove. First ring portion and the second ring portion fixed connection, the spacing groove joint through the spacing arch of installation axle and first ring portion for the installation axle can be fixed with solid fixed ring component, and when using, only need fix solid fixed ring component, the installation axle just can not take place to rotate, and first rotation portion, second rotation portion, first reset ring and second reset ring can accurately rotate around the installation axle.

Preferably, the first and second reset rings are respectively accommodated in the first and second ring portions, the first reset ring rotates in the first ring portion, and the first ring portion can limit and protect the first reset ring. The second resets and encircles the internal rotation in the second ring portion, and the second ring portion can restrict and protect the second resets.

Preferably, the angle resetting notch part is arc-shaped, the arc-shaped circle center is concentric with the circle center of the corresponding first resetting ring/second resetting ring, when the limiting strip moves on the angle resetting notch part, the limiting strip can rotate around the circle center of the first resetting ring/second resetting ring, the rotatable angle of the first rotating part/second rotating part corresponds to the circle center angle of the angle resetting notch part, and the adjustable angle of the first rotating part and the second rotating part can be controlled more accurately.

Preferably, each set of mounting grooves includes two oppositely disposed mounting grooves, each mounting groove having the pawl portion and the resilient member mounted therein. Through the cooperation of two relative pawl portions and the inner ratchet ring, the first rotating portion and the second rotating portion can be more stable after rotating, and the bearing capacity is better. The ratchet part and the inner ratchet ring are not easy to loosen, and uncontrolled return action is avoided.

A seat frame comprises a connecting shaft and the angle adjusting mechanism; the angle adjusting mechanism is fixed on two sides of the connecting shaft. Angle adjustment mechanism is through can being connected with the connecting axle through installation axle or first ring portion, and angle adjustment mechanism is located the both sides of connecting axle, and when the installation was used, the angle adjustment mechanism of both sides drove the rotation of back and seat support simultaneously, and when not rotating, both sides all can produce the restriction to the rotation, makes back and seat support both ends atress balanced.

Preferably, the seat frame further comprises a connecting part, and two ends of the connecting shaft are provided with limiting blocks matched with the limiting grooves; the mounting shaft is provided with a through hole, and the connecting shaft is provided with a connecting hole which is coaxial with the through hole; the connecting part is provided with a connecting rod which can be inserted into the through hole and the connecting hole. The connecting rod passes through the through hole and then is in threaded connection with the connecting hole, and the first ring part is clamped with the limiting block through the limiting groove, so that the whole angle adjusting mechanism is fixedly connected with the connecting shaft.

Preferably, the fixed ring component is connected with the chair leg, namely the first ring part and the second ring part can be connected with the chair leg, the chair leg is abutted against the ground, the first ring part and the second ring part are fixed, meanwhile, the arrangement of other parts can be reduced, and the structure is simplified.

A chair comprises a backrest, a seat and the chair frame; the first rotating part and the second rotating part which are positioned on two sides of the connecting shaft are respectively connected with the backrest and the chair seat. The backrest passes through the fastener and is located the first rotation portion fixed connection of connecting axle both sides, and the seat support passes through the fastener and is connected with the second rotation portion that is located the connecting axle both sides, and when the pulling backrest upwards rotated, the first rotation portion of both sides rotates along with the backrest, and when the pulling seat support upwards rotated, the second rotation portion of both sides rotated along with the seat support, and first rotation portion and second rotation portion realize the regulation of its angle through angle adjustment mechanism. And the user sits on the seat, and seat support and back all receive downward pivoted power, and pawl portion produces pivoted restriction to interior ratchet ring for seat support and back remain stable, and the seat has good bearing capacity.

Compared with the prior art, the beneficial effects of the utility model are that: through angle adjustment mechanism's first rotation portion and second rotation portion effect, the back and seat support homoenergetic carry out the free regulation of angle as required user's needs, improve user's comfort. In addition, the first rotating part and the second rotating part are respectively subjected to angle adjustment through the ratchet wheel and pawl structure and reset through the reset ring structure, so that the mechanical structure is simpler, the production assembly is facilitated, and the production cost is reduced.

Drawings

Fig. 1 is an exploded schematic view of an angle adjustment mechanism of the present invention;

fig. 2 is a schematic structural view of a seat frame according to the present invention;

fig. 3 is an exploded view of a seat frame according to the present invention;

fig. 4 is a schematic structural view of a seat of the present invention;

FIG. 5 is a schematic view of the pawl portion of the present invention in engagement with the inner ratchet ring;

fig. 6 is a schematic view of the ratchet portion and the inner ratchet ring of the present invention in a disengaged state.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limiting the present patent, and those skilled in the art will understand the specific meaning of the terms according to their specific circumstances.

The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:

example 1

Fig. 1 shows an embodiment of an angle adjusting mechanism, which includes a mounting shaft 1, a first rotating portion 2 and a second rotating portion 3, both of which are sleeved on the mounting shaft 1; the first rotating part 2 and the second rotating part 3 are both provided with inner ratchet rims 4, and the inner ratchet rims 4 are both coaxial with the mounting shaft 1 and can rotate relative to the mounting shaft 1; two sets of mounting grooves 5 distributed along the axial direction are arranged on the mounting shaft 1, and pawl parts 6 matched with the inner ratchet ring 4 are respectively arranged in the mounting grooves 5; an elastic member 501 for pushing the pawl portion 6 to keep engaged with the inner ratchet ring 4 is provided in the mounting groove 5.

Specifically, the mechanical hand further comprises a first reset ring 7 and a second reset ring 8 which are sleeved on the mounting shaft 1, wherein the first reset ring 7 and the second reset ring 8 can rotate around the mounting shaft 1, and the first reset ring 7 and the second reset ring 8 respectively correspond to the first rotating part 2 and the second rotating part 3; the width of the pawl part 6 is larger than that of the inner ratchet ring 4, and the inner rings of the first reset ring 7 and the second reset ring 8 are provided with a plurality of limiting notch parts 9 for accommodating the pawl part 6; the outer rings of the first reset ring 7 and the second reset ring 8 are provided with angle reset gap parts 10; the first and second rotating portions 2 and 3 are mounted with a stopper bar 11 for moving in the angular return notch portion 10. When the first rotating portion 2 rotates, the limiting bar 11 of the first rotating portion 2 moves on the angular resetting notch portion 10, and when the limiting bar 11 moves to the limit position of the angular resetting notch portion 10, the first rotating portion 2 continuously moves to drive the first resetting ring 7 to rotate together. When the first reset ring 7 rotates, the limit notch portion 9 rotates relative to the pawl portion 6, so that the pawl portion 6 is separated from the limit notch portion 9 and is abutted against the inner ring of the first reset ring 7, the pawl portion 6 is not meshed with the inner ratchet ring 4, at the moment, the first rotating portion 2 can be reset until the limit strip 11 reaches the limit position in the other direction of the angle reset notch portion 10, the first reset ring 7 is driven to rotate, the pawl portion 6 enters the limit notch portion 9 again and is meshed with the inner ratchet ring 4 again, and resetting of the first rotating portion 2 is achieved. The angle of rotation of the first rotating part 2 is determined by the arc length of the angular return notch part 10 and the initial position of the stopper bar 11. The resetting of the second rotating part 3 is identical to the resetting of the first rotating part 2, except for the difference of the initial position and the opposite rotation direction of the spacing bar 11. Specifically, angle reset breach portion 10 is the arc, the curved centre of a circle is concentric with the centre of a circle of the first ring of resetting 7 of corresponding second reset ring 8, make spacing strip 11 when moving on angle reset breach portion 10, can rotate round the centre of a circle of first ring of resetting 7/second reset ring 8, make the rotatable angle with first rotation portion 2/second rotation portion 3 correspond with the centre of a circle angle of angle reset breach portion 10, the adjustable angle of first rotation portion 2 and second rotation portion 3 can obtain more accurate control.

Also, a fixing ring member 12; the fixing ring member 12 includes a first ring portion 1201 and a second ring portion 1202 mounted to both ends of the mounting shaft 1, respectively; one end of the mounting shaft 1 is provided with a limiting protrusion 101, and the first ring part 1201 is provided with a limiting groove 12011 matched with the limiting protrusion 101. First ring portion 1201 and second ring portion 1202 fixed connection, spacing lug 101 through installation axle 1 and the spacing groove 12011 joint of first ring portion 1201 for installation axle 1 can be fixed with solid fixed ring member 12, and when using, only need to fix solid fixed ring member 12, installation axle 1 just can not take place to rotate, and first rotation portion 2, second rotation portion 3, first reset ring 7 and second reset ring 8 can accurately rotate around installation axle 1.

Specifically, the first and second reset rings 7 and 8 are respectively accommodated in the first ring portion 1201 and the second ring portion 1202, the first reset ring 7 rotates in the first ring portion 1201, and the first ring portion 1201 can limit and protect the first reset ring 7. The second reset ring 8 rotates in the second ring portion 1202, and the second ring portion 1202 can restrain and protect the second reset ring 8.

Specifically, each set of mounting grooves comprises two oppositely arranged mounting grooves 5, and each mounting groove 5 is internally provided with a pawl part 6 and an elastic piece. Through two relative pawl portions 6 and the cooperation of interior ratchet wheel rim 4 for first rotation portion 2 and second rotation portion 3 can be more firm after rotating, and bearing capacity is better. The pawl part 6 and the inner ratchet ring 4 are not easy to loosen, and uncontrolled return action is avoided.

The working principle of the embodiment is as follows: the first rotating part 2 and the second rotating part 3 are respectively connected with the backrest and the seat, when the backrest needs to be rotated, the first rotating part 2 rotates relative to the mounting shaft 1, because the inner ratchet ring 4 is meshed with the pawl part 6, the first rotating part 2 can rotate for a certain angle around one direction, and the elastic part can enable the pawl part 6 to keep a meshed state with the inner ratchet ring 4, so that the stability of the backrest is ensured, as shown in a state shown in fig. 5. When the first rotating portion 2 rotates, the limiting bar 11 of the first rotating portion 2 moves on the angular resetting notch portion 10, and when the limiting bar 11 moves to the limit position of the angular resetting notch portion 10, the first rotating portion 2 continuously moves to drive the first resetting ring 7 to rotate together. When the first reset ring 7 rotates, the limit notch portion 9 rotates relative to the pawl portion 6, so that the pawl portion 6 is separated from the limit notch portion 9 and is abutted against the inner ring of the first reset ring 7, and the pawl portion 6 is not engaged with the inner ratchet ring 4, as shown in a state shown in fig. 6, at this time, the first rotating portion 2 can be reset until the limit strip 11 reaches a limit position in the other direction of the angular reset notch portion 10, and the first reset ring 7 is driven to rotate, so that the pawl portion 6 enters the limit notch portion 9 again and is re-engaged with the inner ratchet ring 4, the first rotating portion 2 is reset, and the state shown in fig. 5 is restored. The angle of rotation of the first rotating part 2 is determined by the arc length of the angular return notch part 10 and the initial position of the stopper bar 11. When the chair seat needs to be rotated, the same as the backrest is rotated, and the difference is that the rotation angles are opposite.

The beneficial effects of this embodiment: through the first rotation portion 2 and the 3 effects of second rotation portion of angle adjustment mechanism, the angle is carried out according to needs that back and seat support homoenergetic used the user, improves user's comfort. In addition, the first rotating part 2 and the second rotating part 3 are respectively subjected to angle adjustment through the ratchet wheel and pawl structure and reset through the reset ring structure, so that the mechanical structure is simpler, the production assembly is facilitated, and the production cost is reduced.

Example 2

As shown in fig. 2 to 3, an embodiment of a seat frame includes a connecting shaft 13 and the angle adjusting mechanism of embodiment 1; the angle adjusting mechanism is fixed on both sides of the connecting shaft 13. The angle adjusting mechanism can be connected with the connecting shaft 13 through the mounting shaft 1 or the first ring part 1201, the angle adjusting mechanism is located on two sides of the connecting shaft 13, when the angle adjusting mechanism is mounted and used, the angle adjusting mechanism on two sides simultaneously drives the rotation of the backrest and the seat, when the angle adjusting mechanism is not rotated, the two sides can limit the rotation, and the stress on two ends of the backrest and the two ends of the seat are balanced.

The seat frame further comprises a connecting part 14, and two ends of the connecting shaft 13 are provided with limiting blocks 1301 matched with the limiting grooves 12011; the mounting shaft 1 is provided with a through hole 102, and the connecting shaft 13 is provided with a connecting hole 1302 coaxial with the through hole 102; the connecting portion 14 is provided with a connecting rod 1401 which can be fitted into the through-hole 102 and the connecting hole 1302. The connecting rod 1401 is threaded to the connecting hole 1302 after passing through the through hole 102, and the first ring portion 1201 is engaged with the limiting block through the limiting groove 12011, so that the entire angle adjusting mechanism is fixedly connected to the connecting shaft 13.

Specifically, the fixing ring member 12 is connected to the chair leg 1203, that is, the first ring portion 1201 and the second ring portion 1202 can be connected to the chair leg 1203, and the chair leg 1203 abuts against the ground, so that the first ring portion 1201 and the second ring portion 1202 are fixed, and meanwhile, the number of other components can be reduced, and the structure is simplified.

The remaining technical features and the working principle of the present embodiment are consistent with those of embodiment 1.

Example 3

Fig. 4 shows an embodiment of a chair, which comprises a backrest 16, a seat 15 and a chair frame of embodiment 2; the first and second rotating parts 2 and 3 located at both sides of the connecting shaft 13 are connected to the backrest 16 and the seat 15, respectively. The backrest 16 is fixedly connected with the first rotating parts 2 located on two sides of the connecting shaft 13 through fasteners, the seat 15 is connected with the second rotating parts 3 located on two sides of the connecting shaft 13 through fasteners, when the backrest 16 is pulled to rotate upwards, the first rotating parts 2 on two sides rotate along with the backrest 16, when the seat 15 is pulled to rotate upwards, the second rotating parts 3 on two sides rotate along with the seat 15, and the first rotating parts 2 and the second rotating parts 3 realize the angle adjustment through an angle adjusting mechanism. When a user sits on the seat, the seat 15 and the backrest 16 are both subjected to downward rotating force, and the pawl part 6 limits the rotation of the inner ratchet ring 4, so that the seat and the backrest are kept stable, and the seat has good bearing capacity.

The remaining technical features and the working principle of the present embodiment are consistent with those of embodiment 2.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. An angle adjusting mechanism is characterized by comprising an installation shaft (1), a first rotating part (2) and a second rotating part (3), wherein the first rotating part and the second rotating part are sleeved on the installation shaft (1); the first rotating part (2) and the second rotating part (3) are both provided with inner ratchet rims (4), and the inner ratchet rims (4) are coaxial with the mounting shaft (1) and can rotate relative to the mounting shaft (1); two groups of mounting grooves (5) distributed along the axial direction are arranged on the mounting shaft (1), and pawl parts (6) matched with the inner ratchet ring (4) are respectively mounted in the mounting grooves (5); an elastic piece (501) for pushing the pawl part (6) to keep engaged with the inner ratchet ring (4) is arranged in the mounting groove (5).

2. An angle adjustment mechanism according to claim 1, further comprising a first reset ring (7) and a second reset ring (8) sleeved on the mounting shaft (1), wherein the first reset ring (7) and the second reset ring (8) are rotatable around the mounting shaft (1), and the first reset ring (7) and the second reset ring (8) correspond to the first rotating portion (2) and the second rotating portion (3), respectively; the width of the pawl part (6) is larger than that of the inner ratchet ring (4), and a plurality of limiting notch parts (9) for accommodating the pawl part (6) are arranged on the inner rings of the first reset ring (7) and the second reset ring (8); the outer rings of the first reset ring (7) and the second reset ring (8) are provided with angle reset notch parts (10); the first rotating part (2) and the second rotating part (3) are provided with a limiting strip (11) used for the angle resetting notch part (10) to move.

3. An angle adjustment mechanism according to claim 2, further comprising a fixed ring member (12); the fixing ring member (12) comprises a first ring part (1201) and a second ring part (1202) which are respectively arranged at two ends of the mounting shaft (1); one end of the mounting shaft (1) is provided with a limiting protrusion (101), the first ring portion (1201) is provided with a limiting groove (12011) matched with the limiting protrusion (101), and the first reset ring (7) and the second reset ring (8) are accommodated in the first ring portion (1201) and the second ring portion (1202) respectively.

4. An angle adjustment mechanism according to claim 3, characterized in that said first (7) and second (8) reset rings are housed respectively in said first (1201) and second (1202) ring portions.

5. An angle adjustment mechanism according to claim 3, characterized in that the angular return notch portion (10) is arc-shaped.

6. An angle adjusting mechanism according to claim 3, wherein each set of mounting grooves (5) comprises two oppositely disposed mounting grooves (5), and each mounting groove (5) is provided with the pawl portion (6) and the elastic member (501).

7. A seat frame, characterized in that it comprises a connecting shaft (13) and an angle adjustment mechanism according to any one of claims 3-6; the angle adjusting mechanism is fixed on two sides of the connecting shaft (13).

8. The seat frame according to claim 7, characterized by comprising a connecting part (14), wherein two ends of the connecting shaft (13) are provided with limit blocks (1301) matched with the limit grooves (12011); the mounting shaft (1) is provided with a through hole (102), and the connecting shaft (13) is provided with a connecting hole (1302) which is coaxial with the through hole (102); the connecting part (14) is provided with a connecting rod (1401) which can be inserted into the through hole (102) and the connecting hole (1302).

9. A seat frame as claimed in claim 7, characterised in that said securing ring member (12) is connected to a seat foot.

10. A chair comprising a backrest (16) and a seat (15), characterized in that it further comprises a frame according to any one of claims 7 to 9; the first rotating part (2) and the second rotating part (3) which are positioned on two sides of the connecting shaft (13) are respectively connected with the backrest (16) and the seat (15).

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