CN116607608A

CN116607608A - Closestool button structure

Info

Publication number: CN116607608A
Application number: CN202310624789.7A
Authority: CN
Inventors: 黄伟新; 谢伟藩
Original assignee: Foshan Hegii Sanitaryware Co ltd
Current assignee: Foshan Hegii Sanitaryware Co ltd
Priority date: 2023-05-30
Filing date: 2023-05-30
Publication date: 2023-08-18

Abstract

The invention discloses a closestool key structure, which comprises a button component and an electric driving component; the button component comprises a pressing rod, a crank and a connecting piece, wherein the crank is positioned below the pressing rod, one end of the connecting piece is connected with the upper end or the lower end of the crank, the other end of the connecting piece is used for connecting a flushing valve of a toilet, the crank can axially rotate, and when the pressing rod presses the upper end of the crank, one end of the crank connected with the connecting piece swings in an arc shape to pull the connecting piece to move; the electric drive assembly comprises a motor, a sector gear and a rack, wherein the sector gear is fixed on a motor shaft of the motor and meshed with the rack, and the rack is abutted with the crank, so that the motor can sequentially drive the end, connected with the connecting piece, of the crank to swing in an arc shape through the sector gear and the rack. The closestool key structure realizes the integrated design of manual flushing and automatic flushing, has simple and compact structure, and does not interfere with manual flushing and automatic flushing.

Description

Closestool button structure

Technical Field

The invention belongs to the technical field of intelligent closestool keys, and particularly relates to a closestool key structure.

Background

Along with the demand of people for life quality is higher and higher, intelligent closestool becomes life necessity gradually, because intelligent closestool not only has traditional manual bath button, but also has bath drive arrangement, can realize automatic bath, and it is more convenient to use. However, the existing intelligent closestool adopts a manual flushing button to be arranged on a water tank cover, and a split structural design in the water tank is arranged on a flushing driving device, so that the flushing driving device is close to a water line of the water tank or is positioned below the water line of the water tank, so that the risk of water inlet short circuit of the flushing driving device is easy to occur, and the intelligent closestool has the advantages of complex overall structure, high maintenance difficulty and high production cost.

Disclosure of Invention

In view of the above, the present invention discloses a toilet key structure to overcome or at least partially solve the above-mentioned problems.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the invention provides a toilet key structure, which comprises a button component and an electric driving component;

the button assembly comprises a pressing rod, a crank and a connecting piece, wherein the crank is positioned below the pressing rod, one end of the connecting piece is connected with the upper end or the lower end of the crank, the other end of the connecting piece is used for being connected with a flushing valve of a toilet, the crank can axially rotate, and when the pressing rod presses down the upper end of the crank, one end of the crank connected with the connecting piece swings in an arc shape to pull the connecting piece to move;

the electric drive assembly comprises a motor, a sector gear and a rack, wherein the sector gear is fixed on a motor shaft of the motor and meshed with the rack, the rack is abutted to the crank, so that the motor can sequentially pass through the sector gear and the rack for transmission, and one end of the crank, which is connected with the connecting piece, is driven to swing in an arc shape.

Further, a driving block is fixed on the rack and is abutted with the upper end or the lower end of the crank.

Further, the button assembly further comprises an elastic member;

the elastic piece is used for providing a reset force for the crank after rotation.

Further, the crank is V-shaped, arc-shaped or 1-shaped, and the rotating shaft of the crank is positioned in the middle of the crank.

Further, the button assembly further comprises a button shell, a return spring and a button rod;

the lower end of the button rod penetrates through the button shell and is fixedly connected with the upper end of the lower pressure rod, the reset spring is sleeved on the button rod, the upper end of the reset spring is connected with the upper end of the button rod, and the lower end of the reset spring is connected with the button shell;

and a limit flange is arranged at the lower end of the lower pressure rod along the circumferential direction, and a limit boss matched with the limit flange is arranged at the lower end of the button shell.

Further, the electric drive assembly further comprises an electric drive housing;

the motor, the sector gear, the rack and the crank are all arranged in the electric driving shell, and the electric driving shell is connected with the button shell through a buckle structure.

Further, the electric driving shell comprises a first shell, a second shell, a third shell and a fourth shell which are fixedly connected in sequence;

the crank with the drive piece is located first cavity that forms between first casing with the second casing, the sector gear with the rack is located in the second cavity that forms between second casing with the third casing, it has spacing opening to open on the second casing, the drive piece passes spacing opening with rack fixed connection, the motor is located in the fourth casing.

Further, a crank rotating shaft extends from the second shell, the crank is sleeved on the crank rotating shaft, and a first positioning groove for accommodating the front end of the crank rotating shaft is formed in the first shell;

the fan-shaped gear is axially extended with a protruding part, and the second shell is provided with a second positioning groove for accommodating the protruding part.

Further, a guiding opening or a guiding groove is formed in the rack along the length direction, and a guiding protruding block matched with the guiding opening or the guiding groove is arranged on the third shell, so that the rack can only move along the length direction.

Further, the upper end or the lower end of the crank is rotatably connected with the connecting piece.

The invention has the advantages and beneficial effects that:

in the closestool key structure, the crank capable of axially rotating is arranged to enable the crank to be positioned below the pressing rod, the crank is connected with the flushing valve of the closestool through the connecting piece, and when the pressing rod is pressed, the crank can be driven to pull the flushing valve open, so that manual flushing of the key structure is realized; in addition, through setting up motor, sector gear and rack, rack and crank butt, when motor drive sector gear rotated, the sector gear can drive the rack and carry out horizontal migration, drives the crank and rotates, and then pulls open the bath valve, realizes the automatic bath of button structure, and through the ingenious cooperation of sector gear and rack, makes the motor rotate to one direction just can realize rotation and the reset of crank, has reduced the requirement to the automatically controlled logic of motor and motor, and then has reduced manufacturing cost; the closestool key structure realizes the integrated design of manual flushing and automatic flushing, has simpler and more compact structure, is convenient to detach and maintain, has low production cost, and does not interfere with the manual flushing and the automatic flushing; in addition, because the closestool button structure can be fixed on the water tank cover of closestool, make the motor keep away from the work water line of water tank, can effectively prevent the emergence of the failure condition of intaking.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a block diagram showing the assembly of a toilet key structure in a toilet according to an embodiment of the present invention;

FIG. 2 is a perspective view of a toilet key structure according to an embodiment of the present invention;

FIG. 3 is a vertical cross-sectional view of a toilet key structure in a direction perpendicular to a motor shaft according to an embodiment of the present invention;

FIG. 4 is a perspective view showing a structure of a button of a toilet bowl with a first housing removed according to an embodiment of the present invention;

FIG. 5 is a diagram of the positional relationship of a crank, rack, sector, and motor in one embodiment of the invention;

fig. 6 is a perspective view of a rack bar according to an embodiment of the present invention.

In the figure: 1. pressing down a rod; 2. a crank; 3. a connecting piece; 4. a flush valve; 5. a motor; 6. a sector gear; 7. a rack; 8. a driving block; 9. an elastic member; 10. a button housing; 11. a return spring; 12. a push button lever; 13. a limit flange; 14. a limit boss; 15. a first housing; 16. a second housing; 17. a third housing; 18. a fourth housing; 19. a limit opening; 20. a crank shaft; 21. a boss; 22. a guide opening; 23. a guide slope; 24. a protruding rib; 25. a nut; 26. a fixing flange; 27. a water tank cover; 28. and a key cover.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The following describes in detail the technical solutions provided by the embodiments of the present invention with reference to the accompanying drawings.

In one embodiment of the invention, a toilet key structure is disclosed that includes a button assembly and an electrically driven assembly.

Specifically, as shown in fig. 1 and 3, the button assembly includes a pressing rod 1, a crank 2 and a connecting piece 3, the crank 2 is located below the pressing rod 1, one end of the connecting piece 3 is connected with the lower end of the crank 2, the other end of the connecting piece 3 is used for connecting a flushing valve 4 of a toilet, the crank 2 can axially rotate, when the pressing rod 1 is pressed, the pressing rod 1 presses the upper end of the crank 2, at this time, the crank 2 axially rotates, the lower end of the crank 2 swings in an arc shape, the connecting piece 3 is pulled to move, and then a flushing valve 4 is opened, so that manual flushing is realized.

In addition, in the process of manual flushing, the moving stroke of the connecting piece 3 can be controlled by controlling the pressing amount of the pressing rod 1, so that the opening degree of the flushing valve 4 is controlled, the flushing water amount is controlled, and the manual half flushing and the manual full flushing are realized; when the pressure-down lever 1 is not pressed, the connecting piece 3 is pulled reversely due to the gravity action of the flushing valve 4, the crank 2 is driven to rotate reversely, and the position is reset to the initial position (namely the position where the crank is in fig. 3).

Of course, one end of the connecting piece can also be connected with the upper end of the crank, so that when the upper end of the crank is pressed down by the pressing rod, the upper end of the crank can swing in an arc shape, and the connecting piece is pulled to move.

As shown in fig. 5, the electric drive assembly comprises a motor 5, a sector gear 6 and a rack 7; wherein the sector gear is a gear with one side having teeth and one side having no teeth; the sector gear 6 is fixed to the motor shaft of the motor 5, and is engaged with the rack 7, and the rack 7 abuts against the crank 2. When the motor 5 does not drive the sector gear 6 to rotate, the rack 7 and the crank 2 are in abutting connection, so that the rack 7 does not interfere with the rotation of the crank 2 when the pressing rod 1 is pressed to drive the crank 2 to rotate, and the electric driving assembly does not affect the realization of the manual flushing function of the key structure. When the motor 5 drives the sector gear 6 to rotate, the toothed side of the sector gear 6 is contacted with the rack 7, the rack 7 is driven to horizontally move through meshing transmission, the rack 7 is abutted with the crank 2 to drive the crank 2 to rotate, the lower end of the crank 2 swings in an arc shape, the connecting piece 3 is pulled to move, and the flushing valve 4 is opened, so that automatic flushing is realized; when the sector gear 6 rotates to the toothless side to contact with the rack 7, the sector gear 6 cannot provide driving force for the rack 7, and at this time, the crank 2 and the rack 7 are driven to return to the initial positions due to the gravity action of the flushing valve 4. Through the cooperation design of rack 7 and sector gear 6, make motor 5 rotate just can realize the rotation and the reset of crank 2 towards a direction, need not motor 5 reverse rotation and realize the reset of crank 2, reduced the functional requirement to motor 5 to make motor 5's automatically controlled logic simpler, and then reduced closestool button structure manufacturing cost.

When the motor 5 drives the sector gear 6 to rotate for one circle, the moving stroke of the rack 7 is maximum, so that the moving stroke of the connecting piece 3 is also maximum, and one-time automatic full punching can be completed; when the motor 5 drives the sector gear 6 to rotate for a certain angle and then reversely rotate, the moving stroke of the rack 7 is smaller than that of the rack 7 during automatic full flushing, at the moment, the moving stroke of the connecting piece 3 is shorter, the flushing valve 4 is only partially opened, and one-time automatic half flushing can be completed.

In addition, the motor can be controlled to work through the remote control key to realize automatic flushing; or the motor is controlled to work through the induction device, for example, when an infrared sensor on the closestool senses that a human body leaves the closestool, the motor is controlled to work so as to automatically flush water; or the motor is controlled to work together through the remote control key and the sensing device.

In summary, in the toilet key structure of the embodiment, by arranging the crank capable of axially rotating, the crank is located below the pressing rod, and the crank is connected with the flushing valve of the toilet through the connecting piece, when the pressing rod is pressed, the crank can be driven to pull the flushing valve open, so that the manual flushing of the key structure is realized; in addition, through setting up motor, sector gear and rack, rack and crank butt, when motor drive sector gear rotated, the sector gear can drive the rack and carry out horizontal migration, drives the crank and rotates, and then pulls open the bath valve, realizes the automatic bath of button structure, and through the ingenious cooperation of sector gear and rack, makes the motor rotate to one direction just can realize rotation and the reset of crank, has reduced the requirement to the automatically controlled logic of motor and motor, and then has reduced manufacturing cost; the closestool key structure realizes the integrated design of manual flushing and automatic flushing, has simpler and more compact structure, is convenient to detach and maintain, has low production cost, and does not interfere with the manual flushing and the automatic flushing; in addition, because the closestool button structure can be fixed on the water tank cover of closestool, make the motor keep away from the work water line of water tank, can effectively prevent the emergence of the failure condition of intaking.

In the present embodiment, as shown in fig. 3 to 6, a driving block 8 is fixed to the rack 7, and the driving block 8 abuts against the lower end of the crank 2, so that the crank 2 can be driven to rotate by the driving block 8 when the rack 7 moves horizontally. In addition, as shown in fig. 5, the part of the crank 2, which is abutted against the driving block 8, is circular, so that the driving block 8 can be in smooth contact with the crank 2 in the process of driving the crank 2 by the driving block 8, and the driving block 8 is ensured to drive the crank 2 to rotate more stably.

In addition, as shown in fig. 3 and 4, the button assembly further includes an elastic member 9.

The elastic member 9 has a pre-tightening force, and is used for providing a restoring force for the crank 2 after rotation, when the pressing rod 1 is not pressed down and the motor 5 stops rotating, namely after manual flushing and automatic flushing are completed, the elastic member 9 drives the crank 2 to reversely rotate and restore to an initial position.

Further, as shown in fig. 3 to 5, the crank 2 is V-shaped, the lower end of the crank 2 is abutted against the driving block 8, and the rotating shaft of the crank 2 is located at the middle position of the crank 2, namely, the upper end of the crank 2, the middle of the crank 2 and the lower end of the crank 2 form a V-shape; thus, when the upper end of the crank 2 is pressed, the lower end of the crank 2 can perform arc-shaped swing. The angle formed between the upper end of the crank and the lower end of the crank is 60-120 degrees, so that when the upper end of the crank is pressed down, the swinging stroke of the lower end of the crank can just pull out the flushing valve of the toilet; preferably, the angle formed between the upper end of the crank and the lower end of the crank is 90 °. Of course, in other embodiments, the crank may be arc-shaped or "1" shaped, and is also within the scope of the present invention.

In the present embodiment, as shown in fig. 1 to 3, the button assembly further includes a button housing 10, a return spring 11, and a button lever 12.

Specifically, the lower end of the button rod 12 passes through the button housing 10 and is fixedly connected with the upper end of the pressing rod 1, and the pressing of the pressing rod 1 can be achieved by pressing the button rod 12, for example, the lower end of the button rod 12 and the upper end of the pressing rod 1 are fixedly connected through a thread structure, so that the distance between the lower end of the pressing rod 1 and the upper end of the crank 2 can be adjusted through the thread structure. And, the upper end of button pole 12 is fixed with the button lid 28, and button lid 28 is the arc extension face, makes the comfort better when manual pressing. The reset spring 11 is sleeved on the button rod 12, the upper end of the reset spring 11 is connected with the upper end of the button rod 12, and the lower end of the reset spring 11 is connected with the button shell 10; the reset spring 11 has pretightening force, after the button rod 12 is pressed, the reset spring 11 provides upward reset force for the button rod 12 to reset to the initial position (namely the position of the button rod in fig. 3); at the same time, the return spring 11 also provides an upward supporting force for the push button lever 12 and the depression lever 1.

And, be equipped with limit flange 13 along the circumferencial direction on the lower extreme of depression bar 1, the lower extreme of button shell 10 is equipped with limit boss 14 with limit flange 13 complex, prevents that depression bar 1 from entering into button shell 10 completely.

In addition, be fixed with the flexor (not shown in the figure) on the lower terminal surface of depression bar, when the lower extreme of depression bar and the upper end contact of crank down, the flexor can play buffering cushioning's effect, can effectively prevent the production of noise, and then improved the experience of closestool use and felt. Of course, in other embodiments, the flexible member may be fixed only on the upper end surface of the crank; or the flexible parts are fixed on the lower end surface of the pressing rod and the upper end surface of the crank. Wherein, the flexible piece can be a rubber sheet.

In this embodiment, as shown in fig. 1 to 5, the electric drive assembly further includes an electric drive housing including a first housing 15, a second housing 16, a third housing 17, and a fourth housing 18 fixedly connected in this order. Wherein, motor 5, sector gear 6, rack 7 and crank 2 all set up in electric drive shell, and electric drive shell passes through buckle structure with button shell 10 to be connected, the equipment of the closestool button structure of being convenient for and dismantle the maintenance.

Specifically, the crank 2 and the driving block 8 are located in a first cavity formed between the first casing 15 and the second casing 16, the sector gear 6 and the rack 7 are located in a second cavity formed between the second casing 16 and the third casing 17, a limiting opening 19 is formed in the second casing 16, the driving block 8 passes through the limiting opening 19 and is fixedly connected with the rack 7, the limiting opening 19 is used for enabling the driving block 8 to move only in the horizontal direction, even if the driving block 8 can only move in the length direction of the rack 7, limiting of movement of the driving block 8 is achieved, the motor 5 is located in a fourth casing 18, and a motor shaft of the motor 5 passes through the third casing 17 and is fixedly connected with the sector gear 6.

Also, as shown in fig. 3 to 5, the elastic member 9 is a torsion spring; the second shell 16 is extended with a crank rotating shaft 20, the crank 2 and the torsion spring are sleeved on the crank rotating shaft 20, one end of the torsion spring is connected with the crank 2, the other end of the torsion spring is connected with the second shell 16, the first shell 15 is provided with a first positioning groove for accommodating the front end of the crank rotating shaft 20, namely, after the first shell 15 is fixed with the second shell 16, the front end of the crank rotating shaft 20 is positioned in the first positioning groove, and positioning and supporting of the crank rotating shaft 20 are realized; the fan-shaped gear 6 is axially extended with a protruding part 21, and the second casing 16 is provided with a second positioning groove for accommodating the protruding part 21, namely, after the second casing 16, the third casing 17 and the fourth casing 18 are fixed, the protruding part 21 on the fan-shaped gear 6 is positioned in the second positioning groove, so that positioning and supporting of the fan-shaped gear 6 are realized.

Therefore, the electric drive shell adopts a multi-shell assembly mode, so that the motor, the rotating wheel and the crank are fixedly supported, and the stability of the closestool key structure is better.

In this embodiment, as shown in fig. 6, a guiding opening 22 is formed on the rack 7 along the length direction, and a guiding projection matched with the guiding opening 22 or the guiding is provided on the third housing 17, so that the rack 7 can only move along the length direction, and the movement guiding of the rack 7 is realized. The front end of the guide opening 22 is provided with a guide slope 23 to facilitate insertion of the guide projection into the guide opening 22. Of course, the guide opening can also be replaced by a guide groove. Moreover, the end face of the rack 7, which is in contact with the second shell 16 and the third shell 17, is provided with the raised rib 24, and the raised rib 24 is arranged along the length direction of the rack 7, so that the contact area between the rack 7 and the second shell 16 and the third shell 17 can be reduced, friction is further reduced, the rack 7 is easier to move relative to the second shell 16 and the third shell 17, abrasion of the rack 7 can be reduced, and the service life of the rack 7 is prolonged.

As shown in fig. 1 to 3, a fixing flange 26 is provided on the upper end of the button housing 10 in the circumferential direction, and a screw structure is provided on the outer circumference of the button housing 10, so that the button housing 10 is fixed to the nut 25 by the screw structure. When the button housing 10 is fixed to the water tank cover 27, the fixing flange 26 is located at the upper side of the water tank cover 27, the nut 25 is located at the lower side of the water tank cover 27, and the button housing 10 can be firmly fixed to the water tank cover 27 by the clamping fit of the nut 25 and the fixing flange 26, and can be assembled and disassembled more easily.

Further, the connecting piece is a steel wire rope, and the steel wire rope has good toughness and long service life, so that vibration interference between the crank and the flushing valve can be prevented, and the service life of the closestool key structure can be prolonged; the outside of the steel wire rope is provided with a protective layer, and the protective layer is fixedly connected with the first shell and the second shell respectively through the fixed ring sleeve, so that the steel wire rope can be isolated from water in a toilet water tank, and the service life of the steel wire rope is further prolonged.

In addition, the lower extreme of crank and connecting piece rotate to be connected, like this when the lower extreme of crank carries out the arc swing, the crank can only produce the pulling force to the connecting piece, can not produce the torsional force, has guaranteed the life of connecting piece.

The foregoing is merely a specific embodiment of the invention and other modifications and variations can be made by those skilled in the art in light of the above teachings. It is to be understood by persons skilled in the art that the foregoing detailed description is provided for the purpose of illustrating the invention more fully, and that the scope of the invention is defined by the appended claims.

Claims

1. The toilet key structure is characterized by comprising a button assembly and an electric driving assembly;

the button assembly comprises a pressing rod (1), a crank (2) and a connecting piece (3), wherein the crank (2) is positioned below the pressing rod (1), one end of the connecting piece (3) is connected with the upper end or the lower end of the crank (2), the other end of the connecting piece (3) is used for being connected with a flushing valve (4) of a toilet, the crank (2) can axially rotate, and when the pressing rod (1) presses down the upper end of the crank (2), one end, connected with the connecting piece (3), of the crank (2) swings in an arc shape to pull the connecting piece (3) to move;

the electric drive assembly comprises a motor (5), a sector gear (6) and a rack (7), wherein the sector gear (6) is fixed on a motor shaft of the motor (5) and meshed with the rack (7), the rack (7) is abutted to the crank (2), so that the motor (5) can sequentially pass through the sector gear (6) and the rack (7) for transmission, and one end of the crank (2) connected with the connecting piece (3) is driven to swing in an arc shape.

2. The toilet key structure according to claim 1, wherein a driving block (8) is fixed on the rack (7), and the driving block (8) is abutted to the upper end or the lower end of the crank (2).

3. The toilet key structure according to claim 1, wherein the button assembly further comprises an elastic member (9);

the elastic piece (9) is used for providing a reset force for the crank (2) after rotation.

4. The toilet key structure according to claim 1, wherein the crank (2) is V-shaped, arc-shaped or "1" -shaped, and the rotation axis of the crank (2) is located at the middle position of the crank (2).

5. The toilet key structure according to claim 1, wherein the button assembly further comprises a button housing (10), a return spring (11) and a button stem (12);

the lower end of the button rod (12) penetrates through the button shell (10) and is fixedly connected with the upper end of the lower pressure rod (1), the reset spring (11) is sleeved on the button rod (12), the upper end of the reset spring (11) is connected with the upper end of the button rod (12), and the lower end of the reset spring (11) is connected with the button shell (10);

the lower end of the lower pressure rod (1) is provided with a limit flange (13) along the circumferential direction, and the lower end of the button shell (10) is provided with a limit boss (14) matched with the limit flange (13).

6. The toilet key structure of claim 3, wherein the electrically driven assembly further comprises an electrically driven housing;

the motor (5), the sector gear (6), the rack (7) and the crank (2) are all arranged in the electric driving shell, and the electric driving shell is connected with the button shell (10) through a buckle structure.

7. The toilet key structure according to claim 6, wherein the electrically driven housing comprises a first housing (15), a second housing (16), a third housing (17) and a fourth housing (18) fixedly connected in sequence;

the crank (2) and the driving block (8) are located in a first cavity formed between the first shell (15) and the second shell (16), the sector gear (6) and the rack (7) are located in a second cavity formed between the second shell (16) and the third shell (17), a limiting opening (19) is formed in the second shell (16), the driving block (8) penetrates through the limiting opening (19) and is fixedly connected with the rack (7), and the motor (5) is located in the fourth shell (18).

8. The toilet key structure according to claim 7, wherein the second housing (16) is extended with a crank shaft (20), the crank (2) is sleeved on the crank shaft (20), and the first housing (15) is provided with a first positioning groove for accommodating the front end of the crank shaft (20);

the sector gear (6) is axially extended with a protruding part (21), and the second shell (16) is provided with a second positioning groove for accommodating the protruding part (21).

9. The toilet key structure according to claim 7, wherein the rack (7) is provided with a guide opening (22) or a guide groove along the length direction, and the third housing (17) is provided with a guide projection matched with the guide opening (22) or the guide groove, so that the rack (7) can only move along the length direction.

10. The toilet key structure according to any one of claims 1 to 9, wherein the upper or lower end of the crank (2) is rotatably connected to the connecting member (3).