CN113331618A

CN113331618A - Adjustable seat

Info

Publication number: CN113331618A
Application number: CN202110820392.6A
Authority: CN
Inventors: 张丽; 陈真; 滕建敏
Original assignee: Fuqing Fuyun Home Furnishing Co ltd
Current assignee: Fuqing Fuyun Home Furnishing Co ltd
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2021-09-03

Abstract

The application discloses an adjustable seat, which relates to the technical field of furniture equipment and solves the problems that the included angle between a backup plate and a seat plate is fixed and the angle cannot be adjusted according to the actual use requirement, and comprises a seat, a seat back and an attachment strap, wherein the lower plate surface of the seat back is connected with chair legs, the lower plate surface of one end, close to the seat back, of the attachment strap is connected with a first connecting rod which is perpendicular to the attachment strap, the lower plate surface of one end, close to the seat back, of the seat back is provided with a second connecting rod which is perpendicular to the seat back, a cross rod is hinged between the first connecting rod and the second connecting rod, a third connecting rod which is perpendicular to the cross rod is connected between two adjacent cross rods, a reinforcing rod is connected between the two adjacent chair legs, a fourth connecting rod which is parallel to the cross rod is connected between the two opposite reinforcing rods, an inserting rod is connected on the fourth connecting rod in a sliding manner, and a sleeve for the inserting rod to be inserted is arranged at the position of the third connecting rod, a fixing component is arranged between the inserted link and the sleeve. This application has the effect that the angle that makes between seat backup plate and the seat can be adjusted.

Description

Adjustable seat

Technical Field

The application relates to the technical field of furniture equipment, in particular to an adjustable seat.

Background

The chair is an indispensable furniture article in life, and the chair is generally provided with a backrest, and some chairs are also provided with armrests.

Fig. 9 shows a seat, which comprises a seat plate 28, a back plate 29 and supporting legs 30 connected to four top corners of the lower plate surface of the seat plate 28, wherein the back plate 29 is vertically fixed on one side of the seat plate 28, a surrounding baffle 31 is connected between adjacent supporting legs 30, and the surrounding baffle 31 can improve the integral structural strength of the seat.

In view of the above-mentioned related technologies, the inventor believes that the angle between the backrest plate and the seat plate is fixed during the use of the seat, and the angle cannot be adjusted according to the actual use requirement.

Disclosure of Invention

In order to enable the angle between the seat back plate and the seat plate to be adjusted according to the actual use requirement, the application provides an adjustable seat.

The application provides an adjustable seat, adopts following technical scheme:

the utility model provides an adjustable chair, includes seat support, the back of the chair and access board, four apex angle departments of face are connected with the chair leg under the seat support, the seat support is close to the one end of the back of the chair and is articulated with the back of the chair, the one end that the back of the chair was kept away from to the seat support is articulated with the first connecting rod that perpendicular to access board set up, first connecting rod symmetry sets up the left and right sides at access board width direction, the one end face of going back of the chair that the back of the chair is close to the seat support is provided with the second connecting rod perpendicular to the back of the chair down, second connecting rod symmetry sets up the left and right sides at back of the chair width direction, it has the horizontal pole to articulate between first connecting rod and the second connecting rod, is connected with the third connecting rod that perpendicular to the horizontal pole set up between the two adjacent horizontal poles, is connected with the stiffener between two relative stiffeners, is connected with the fourth connecting rod that is on a parallel with the horizontal pole setting, the fourth connecting rod is connected with an inserted bar in a sliding mode, a sleeve for inserting the inserted bar is arranged at the position, corresponding to the inserted bar, of the third connecting rod, and a fixing assembly is arranged between the inserted bar and the sleeve.

Through adopting above-mentioned technical scheme, when carrying out the use of seat, when inclination between the back of the chair and the seat support needs to be adjusted, take place to rotate the articulated position of the relative seat support of the back of the chair, at this moment, under the linkage effect of crossbeam, the access board is to the direction swing of keeping away from the seat support, the sleeve removes to the upper end of inserted bar this moment, when the back of the chair swings to required inclination, through fixed inserted bar and sleeve of fixed subassembly, realize fixed between inserted bar and the sleeve, thereby realize fixed to inclination between the back of the chair and the seat support, according to the needs of in-service use, inclination between the adjustment back of the chair and the seat support, later fixed inserted bar and sleeve, thereby make the angle between seat backup plate and the seat board can adjust according to the needs of in-service.

Optionally, a sliding groove extending along the length direction of the inserting rod is formed in the side wall of the inserting rod, the accommodating groove is formed in one end of the sleeve, the fixing assembly comprises an inserting block placed between the accommodating groove and the sliding groove, the fixing assembly further comprises a cam pushing the inserting block to move towards the direction of the inserting rod, a sleeve ring is sleeved outside the sleeve, an opening is formed in the position, corresponding to the accommodating groove, of the sleeve ring, the cam is rotatably connected to the position, corresponding to the opening, of the sleeve ring, and the side wall of the cam is abutted to the inserting block.

Through adopting above-mentioned technical scheme, drive the inserted block through the cam and remove to the direction of spout, when the cam was kept away from the one end butt of rotation center on the inserted block, remove the inserted block to the direction of spout to can realize the inserted block fixed to the inserted bar.

Optionally, one side of the insertion block facing the opening is provided with an extension block with a length smaller than that of the insertion block, and the extension block extends into the opening.

Through adopting above-mentioned technical scheme, through the setting of extending the piece, be convenient for realize the pushing action of cam to the inserted block.

Optionally, the insertion block is provided with guide rods parallel to the extension block at two ends of the extension block in the length direction, and when the extension block is arranged in the opening, guide grooves for the guide rods to be inserted are formed in the positions of the lantern rings corresponding to the guide rods.

Through adopting above-mentioned technical scheme, through the setting of guide bar and guide way, be convenient for lead the moving direction of inserted block, can improve the stability of being connected between inserted block and the lantern ring simultaneously.

Optionally, the one end that the seat support was kept away from to the inserted bar is provided with the rack, the relative fourth connecting rod of rack removes, the one side meshing that the seat support was kept away from to the rack has the gear, be connected with first pivot on the gear, the outside to the stiffener is run through at the both ends of first pivot, the one end that first pivot runs through to the stiffener outside is provided with the gyro wheel, the bottom of chair leg also is provided with the gyro wheel.

Through adopting above-mentioned technical scheme, when the gyro wheel rotates, it is rotatory to drive the epaxial gear of first pivot, thereby realize that the gear drives the relative fourth connecting rod of rack and removes, when the in-process that the relative fourth connecting rod of rack removed, the inserted bar of connection on the rack removes relatively, thereby realize driving the change of the relative seat support position of sleeve, after the position change of the relative seat support of sleeve, the back of the chair and the contained angle between attachment strap and the seat support change, thereby can carry out the back of the chair according to the needs of in-service use, the change of contained angle between attachment strap and the seat support.

Optionally, side rods are arranged on the left side and the right side of the rack in the length direction, and a sliding groove for sliding the side rods is formed in the position, corresponding to the side rods, of the fourth connecting rod.

Through adopting above-mentioned technical scheme, through the setting of side lever and spout, be convenient for lead the moving direction of rack to can effectively improve the stability of rack relative fourth connecting rod removal in-process.

Optionally, two sides of the seat close to the first connecting rod and the second connecting rod are provided with side plates extending downwards, one end of each side plate close to the first connecting rod is provided with a first hinge section extending to the outside of the seat, one end of each first connecting rod close to the butt strap is hinged to the first hinge section, a second rotating shaft penetrates between the first connecting rod and the first hinge section, and one end of each second rotating shaft penetrating to the outside of the two first hinge sections is in threaded connection with a nut; the curb plate is close to the one end of second connecting rod and is provided with the articulated section of second that extends to the seat support outside, the one end that the second connecting rod is close to the back of the chair is articulated with the articulated section of second, wear to be equipped with the third pivot between second connecting rod and the articulated section of second, the third pivot is worn to establish to the outside one end of two first articulated sections also threaded connection has the nut.

Through adopting above-mentioned technical scheme, through the setting of second pivot and third pivot, be convenient for realize the rotation between the relative seat support of back of the chair and take.

Optionally, one end of the cross bar close to the third rotating shaft is provided with a yielding groove for accommodating the third rotating shaft.

Through adopting above-mentioned technical scheme, through the setting of the groove of stepping down, be convenient for increase the turned angle of the back of the chair to can effectively increase the scope of the angle that the back of the chair can be adjusted.

In summary, the present application includes at least one of the following benefits:

1. when the chair is used and the inclination angle between the chair back and the chair seat needs to be adjusted, the hinged position of the chair back relative to the chair seat is rotated, at the moment, under the connecting action of the cross rod, the access plate swings towards the direction far away from the chair seat, at the moment, the sleeve moves towards the upper end part of the inserted link, when the chair back swings to the required inclination angle, the inserted link and the sleeve are fixed through the fixing component, so that the inserted link and the sleeve are fixed, the inclination angle between the chair back and the chair seat is adjusted according to the actual use requirement, and then the inserted link and the sleeve are fixed, so that the angle between the chair back plate and the seat plate can be adjusted according to the actual use requirement;

2. when the gyro wheel rotates, it is rotatory to drive the epaxial gear of first pivot, thereby realize that the gear drives the relative fourth connecting rod of rack and removes, when the in-process that the relative fourth connecting rod of rack removed, the inserted bar of connection on the rack removes relative fourth connecting rod, thereby realize driving the change of the relative seat support position of sleeve, after the position change of the relative seat support of sleeve, the back of the chair and the contained angle between access and the seat support change, thereby can carry out the back of the chair according to the needs of in-service use, the change of contained angle between access and the seat support.

Drawings

FIG. 1 is a schematic structural view of the overall structure of the present embodiment;

FIG. 2 is a diagram illustrating the state of the adjustment process in the present embodiment;

FIG. 3 is a schematic cross-sectional view of the highlighted cross-bar configuration of this embodiment;

FIG. 4 is a schematic view of the chair seat, the chair back and the access board of the present embodiment in a horizontal plane;

FIG. 5 is an enlarged schematic view at A in FIG. 4;

FIG. 6 is an exploded view of the barrel and plunger arrangement of the present embodiment;

FIG. 7 is a schematic sectional view showing the state where the sleeve is connected to the plunger in this embodiment;

FIG. 8 is a schematic view showing the state of the cam in the state where the sleeve is fixed to the plunger in this embodiment;

fig. 9 is a schematic structural view of the related art.

Description of reference numerals: 1. a chair seat; 2. a chair back; 3. a butt strap; 4. a side plate; 41. a first hinge section; 42. a second hinge section; 5. a chair leg; 6. a first link; 7. a second rotating shaft; 8. a nut; 9. a second link; 10. a third rotating shaft; 11. a cross bar; 101. a yielding groove; 12. a third link; 13. a reinforcing bar; 14. a fourth link; 141. a side groove; 15. a sleeve; 151. a stepped groove; 152. a containing groove; 16. inserting a rod; 161. a chute; 17. a rack; 18. a gear; 19. a side lever; 20. blocking; 21. a first rotating shaft; 22. a roller; 23. a collar; 231. an opening; 232. a guide groove; 24. a fixing assembly; 241. inserting a block; 242. a cam; 2421. a first abutting portion; 2422. a second abutting portion; 25. a fourth rotating shaft; 26. an extension block; 27. a guide bar; 28. a seat plate; 29. a backup plate; 30. supporting legs; 31. and (7) fencing.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses an adjustable seat. Referring to fig. 1, the adjustable chair comprises a chair seat 1, a chair back 2 and an access board 3, wherein the chair back 2 is hinged to one end of the chair seat 1, the access board 3 is hinged to one end, far away from the chair back 2, of the chair seat 1, the two sides, which are not connected with the chair back 2 and the access board 3, of the chair seat 1 are respectively connected with a side plate 4, and two ends of each side plate 4 in the length direction are fixedly bonded with chair legs 5.

Referring to fig. 2 and 3, 4 face welded fastening of curb plate that access plate 3 is close to seat support 1 one end have first connecting rod 6, first connecting rod 6 sets up with access plate 3 is perpendicular, curb plate 4 sets up to extend to the outside first articulated section 41 of seat support 1 near the one end of access plate 3, first connecting rod 6 is close to the one end of access plate 3 and is articulated with first articulated section 41, wear to be equipped with second pivot 7 between first connecting rod 6 and the first articulated section 41, the outside of the first articulated section 41 of the both ends of second pivot 7 run through to the seat support 1 left and right sides, second pivot 7 extends to one of first articulated section 41 outside and serves threaded connection and has nut 8, be convenient for realize the rotation of access plate 3 relative seat support 1.

Referring to fig. 3, a second connecting rod 9 is welded on the surface of a side plate 4 at one end of the chair back 2 close to the chair seat 1, the second connecting rod 9 is perpendicular to the chair back 2, a second hinge section 42 extending to the outside of the chair seat 1 is arranged at one end of the side plate 4 close to the chair back 2, and the first hinge section 41, the side plate 4 and the second hinge section 42 are integrally cast. One end of the second connecting rod 9 close to the chair back 2 is hinged to the second hinged section 42, a third rotating shaft 10 penetrates between the second connecting rod 9 and the second hinged section 42, two ends of the third rotating shaft 10 penetrate through the outside of the second hinged sections 42 on two sides, and one end of the third rotating shaft 10 penetrating through the outside of the second hinged sections 42 is also in threaded connection with a nut 8, so that the rotation between the chair back 2 and the chair seat 1 is facilitated.

Referring to fig. 3, a cross bar 11 is hinged between the first connecting rod 6 and the second connecting rod 9, when the cross bar 11 moves relative to the seat 1 toward the end far from the access board 3, both the access board 3 and the backrest 2 swing toward the direction close to the seat 1, and when the lower side surface of the access board 3 abuts on the chair legs 5, the backrest 2 is in a state of being perpendicular to the seat 1. When the cross bar 11 moves towards one end close to the access board 3 relative to the seat 1, the access board 3 and the chair back 2 swing towards the direction far away from the seat 1, and when the first connecting rod 6 and the second connecting rod 9 are both in the state of being vertical to the lower surface of the seat 1, the access board 3, the seat 1 and the chair back 2 are on the same horizontal plane.

Referring to fig. 3, one end of the cross bar 11 close to the third rotating shaft 10 is provided with a yielding groove 101 for accommodating the third rotating shaft 10, and when the backrest 2 is in a state perpendicular to the seat 1, the third rotating shaft 10 is accommodated in the yielding groove 101.

Referring to fig. 3, a third connecting rod 12 is connected between adjacent transverse rods 11, a reinforcing rod 13 is connected between adjacent chair legs 5, wherein a fourth connecting rod 14 perpendicular to the third connecting rod 12 is connected between the reinforcing rod 13 near one end of the butt strap 3 and the reinforcing rod 13 near one end of the chair back 2, a sleeve 15 is welded and fixed in the middle of the third connecting rod 12, an inserting rod 16 penetrates through the sleeve 15, and one end of the inserting rod 16 near the fourth connecting rod 14 moves along the length direction of the fourth connecting rod 14.

Referring to fig. 3 and 4, a rack 17 is welded to one end of the insert rod 16 contacting the fourth link 14, and a gear 18 is engaged with one side of the rack 17 far away from the seat 1.

Referring to fig. 3 and 5, side rods 19 arranged along the length direction of the rack 17 are welded on the left side and the right side of the length direction of the rack 17, side grooves 141 for the side rods 19 to slide are formed in the positions, corresponding to the side rods 19, of the fourth connecting rod 14, so that the rack 17 always moves along the length direction of the fourth connecting rod 14, and after the rack 17 and the fourth connecting rod 14 are completely inserted, the fourth connecting rod 14 is welded with blocks 20 at the two ends of the side grooves 141 in the length direction, so that the rack 17 is limited.

Referring to fig. 3 and 4, when the length of the rack 17 is set, when the seat 1, the backrest 2, and the access board 3 are all on the same horizontal plane, the rack 17 abuts against the stopper 20 at one end of the fourth link 14, thereby limiting the rack 17.

Referring to fig. 3, a first rotating shaft 21 penetrates through the axis of the gear 18, two ends of the first rotating shaft 21 extend to the outside of the reinforcing rods 13 on two sides, and a roller 22 is disposed at one end of the first rotating shaft 21 extending to the outside of the reinforcing rods 13, so that when the roller 22 rotates, the seat is driven to move integrally, and meanwhile, in the rotating process of the roller 22, the coaxial gear 18 is driven to rotate, so that the rack 17 moves relative to the fourth connecting rod 14.

Referring to fig. 4, the lower ends of the legs 5 at the four corners of the seat 1 are connected with rollers 22, which facilitates the movement of the whole seat.

Referring to fig. 6 and 7, a sliding groove 161 extending along the length direction of the insert rod 16 is formed in the side wall of the insert rod 16, a stepped groove 151 is formed in one end of the sleeve 15 close to the rack 17, a sleeve ring 23 is sleeved on the position of the stepped groove 151 of the sleeve 15, a containing groove 152 is formed in the position, corresponding to the sliding groove 161, of the outer side wall of the sleeve 15, a fixing component 24 is arranged between the sleeve 15 and the insert rod 16, the fixing component 24 comprises an insert block 241 inserted in the positions of the sliding groove 161 and the containing groove 152, the fixing component 24 further comprises a cam 242 connected to the sleeve ring 23 and used for pushing the insert block 241 to move towards the direction of the sliding groove 161, the cam 242 is rotatably connected to the sleeve ring 23, and a fourth rotating shaft 25 inserted to the cam 242 is connected to the sleeve ring 23.

Referring to fig. 7 and 8, the cam 242 includes a first abutment 2421 distant from the fourth rotation shaft 25 and a second abutment 2422 close to the fourth rotation shaft 25. The position of the collar 23 corresponding to the receiving groove 152 is opened with an opening 231 for the cam 242 to abut against the insert block 241, and when the first abutting part 2421 of the cam 242 abuts against the insert block 241, the insert block 241 is moved toward the insert rod 16. When the insert 241 abuts on the position of the slide slot 161, the fixation between the sleeve 15 and the insert rod 16 is achieved.

Referring to fig. 8, the insertion block 241 is connected to the extension block 26 extending in the direction of the opening 231, and the provision of the extension block 26 improves the convenience of the process in which the cam 242 pushes the insertion block 241. The length of extension piece 26 is less than the length of inserted block 241, inserted block 241 has the guide bar 27 unanimous with extension piece 26 extending direction in the both ends welding of extension piece 26 length direction, offer the guide way 232 that supplies guide bar 27 to peg graft on lantern ring 23, when carrying out the installation of inserted block 241, peg graft inside guide way 232 with the guide bar 27 of inserted block 241 earlier, later cup joint lantern ring 23 on the ladder groove 151 of sleeve 15, at this moment, inserted block 241 moves along storage tank 152, later cup joint inserted bar 16 with sleeve 15, make the relative guide way 232 of guide bar 27 remove, and inserted block 241 does not deviate from lantern ring 23.

The implementation principle of an adjustable seat in the embodiment of the application is as follows:

when the use of the seat is performed, the cam 242 is snapped to a state where the second abutting portion 2422 abuts against the insert block 241, at which time, the sleeve 15 is made to move up and down relative to the insert rod 16, the seat is pushed to move, as the roller 22 moves, the gear 18 is rotated, causing the rack 17 to move relative to the direction of the fourth link 14, when the rack 17 moves relative to the fourth link 14, the position of the inserted link 16 welded on the rack 17 relative to the seat 1 is changed, at this time, the position of the sleeve 15 is changed, after the position of the sleeve 15 is changed, the position of the cross bar 11 is changed, so that the lapping plate 3 and the chair back 2 swing relative to the chair seat 1, when the chair back 2 swings to the required position, the cam 242 swings to the direction close to the inserting block 241, the first abutting part 2421 abuts against the insert block 241, and the sleeve 15 and the insert rod 16 are fixed, thereby fixing the reclining angle of the seat back 2.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an adjustable seat, includes seat support (1), back of the chair (2) and access board (3), four apex angle departments of face are connected with chair leg (5), its characterized in that under seat support (1): the one end that seat support (1) is close to back of the chair (2) is articulated with back of the chair (2), the one end and the attachment strap (3) of the back of the chair (2) are kept away from to seat support (1) are articulated, the one end lower plate that attachment strap (3) are close to seat support (1) is connected with first connecting rod (6) that perpendicular to attachment strap (3) set up, first connecting rod (6) symmetry sets up the left and right sides at attachment strap (3) width direction, the one end lower plate that back of the chair (2) are close to seat support (1) is provided with the second connecting rod (9) that sets up with back of the chair (2) vertically, second connecting rod (9) symmetry sets up the left and right sides at back of the chair (2) width direction, it has horizontal pole (11) to articulate between first connecting rod (6) and second connecting rod (9), is connected with third connecting rod (12) that perpendicular to horizontal pole (11) set up between two adjacent horizontal pole (11), is connected with stiffener (13) between adjacent chair leg (5), be connected with fourth connecting rod (14) that are on a parallel with horizontal pole (11) setting between two relative stiffener (13), sliding connection is connected with inserted bar (16) on fourth connecting rod (14), the position that third connecting rod (12) corresponds inserted bar (16) is provided with sleeve (15) that supply inserted bar (16) to peg graft, be provided with between inserted bar (16) and sleeve (15) fixed subassembly (24).

2. An adjustable seat as claimed in claim 1, wherein: offer spout (161) that the length direction of following inserted bar (16) extends on inserted bar (16) lateral wall, storage tank (152) have been seted up to the one end of sleeve (15), fixed subassembly (24) are including placing inserted block (241) between storage tank (152) and spout (161), fixed subassembly (24) are still including promoting inserted block (241) to being close to cam (242) that inserted bar (16) direction removed, the outside cover of sleeve (15) is equipped with lantern ring (23), opening (231) have been seted up to the position that lantern ring (23) correspond storage tank (152), cam (242) rotate to be connected in the position that the lantern ring (23) set up opening (231), the lateral wall butt inserted block (241) of cam (242).

3. An adjustable seat as claimed in claim 2, wherein: one side of the insertion block (241) facing the opening (231) is provided with an extension block (26) with the length smaller than that of the insertion block (241), and the extension block (26) extends into the opening (231).

4. An adjustable seat as claimed in claim 3, wherein: the two ends of the inserting block (241) in the length direction of the extending block (26) are provided with guide rods (27) which are parallel to the extending block (26), and when the extending block (26) is arranged in the opening (231), the position of the lantern ring (23) corresponding to the guide rods (27) is provided with guide grooves (232) for the insertion of the guide rods (27).

5. An adjustable seat as claimed in claim 1, wherein: the one end that seat support (1) was kept away from in inserted bar (16) is provided with rack (17), the relative fourth connecting rod (14) of rack (17) remove, one side meshing that seat support (1) was kept away from in rack (17) has gear (18), be connected with first pivot (21) on gear (18), the outside to stiffener (13) is run through at the both ends of first pivot (21), first pivot (21) run through to stiffener (13) outside one end and are provided with gyro wheel (22), the bottom of chair leg (5) also is provided with gyro wheel (22).

6. An adjustable seat as claimed in claim 5, wherein: side rods (19) are arranged on the left side and the right side of the rack (17) in the length direction, and a sliding groove (161) for the side rods (19) to slide is formed in the position, corresponding to the side rods (19), of the fourth connecting rod (14).

7. An adjustable seat as claimed in claim 1, wherein: both sides of the chair seat (1) which are not connected with the chair back (2) and the butt strap (3) are provided with side plates (4) extending downwards, one end, close to the first connecting rod (6), of each side plate (4) is provided with a first hinge section (41) extending to the outside of the chair seat (1), one end, close to the butt strap (3), of each first connecting rod (6) is hinged to the corresponding first hinge section (41), a second rotating shaft (7) penetrates through the space between the first connecting rod (6) and the corresponding first hinge section (41), and one end, penetrating through the second rotating shaft (7), of the outside of the two first hinge sections (41) is in threaded connection with a nut (8); curb plate (4) are provided with the articulated section of second (42) that extends to seat support (1) outside near the one end of second connecting rod (9), second connecting rod (9) are close to the one end of the back of the chair (2) and articulated section of second (42), wear to be equipped with third pivot (10) between second connecting rod (9) and the articulated section of second (42), third pivot (10) are worn to establish to the outside one end of two first articulated sections (41) also threaded connection has nut (8).

8. An adjustable seat as claimed in claim 1, wherein: and one end of the cross rod (11) close to the third rotating shaft (10) is provided with a yielding groove (101) for accommodating the third rotating shaft (10).