CN110811198A - Manual pedal device of seat - Google Patents

Abstract

The invention relates to the technical field of furniture seats, in particular to a manual pedal device for a seat. The invention provides a pedal device capable of being independently used, which is very conveniently installed on furniture seat products, and is particularly suitable for being connected and installed on functional sofa leisure chairs. The pedal device can be installed on a single seat, a double seat and a multi-seat. The installation is also very simple and convenient, as long as the pedal device is fixed below the seat cushion through the screw rod. The pedal plate is always kept in a locked state and cannot rotate upwards under the action of the spring in the process of pulling out and pushing back the pedal due to the design of the locking structure. Therefore, the pedal is pulled out and pushed back, only horizontal push-pull force is needed, downward pressure is not needed, and the operation of a user is facilitated.

Description

Manual pedal device of seat

Technical Field

The invention relates to the technical field of furniture seats, in particular to a manual pedal device of a seat.

Background

With the continuous development of social economy, people pursue living quality more and more, and the requirement on the comfort level of the seat is also higher and more. Common furniture seats are not provided with pedal devices, and when people sit in the seats for rest and relaxation, the feet of the people feel not easy and comfortable because the feet of the people are not supported. And the use of independent external pedals occupies too much indoor space, and the height of the pedals cannot be better matched with the height of the seat.

Some cushions in the market with the pedal device are integrally assembled and connected with the seat and cannot be independently disassembled, so that the volume and the weight of the whole seat are increased, and great inconvenience is caused to production and transportation. In addition, the pedals are connected to the seat cushion and are rotated and extended out through the connecting rod mechanism or the rotary rotating mechanism, so that the pedals occupy more space below the seat cushion, the whole seat looks relatively bloated and unattractive, and the aesthetic requirements of the current society are not met.

For the seat with the electric pedal device, the whole structure of the pedal device is more complex and the requirement on the whole strength is higher due to the consideration of the installation of the motor. Meanwhile, the number of parts of the whole product is large, which directly results in the increase of the product cost.

With some manual pedalling seats, the pedal always rotates upwards when the pedal is pulled out and pushed back, due to the absence of some structural arrangements, under the pull of the spring. When the pedals are pulled out and pushed back, if no downward pressing force is used, the pedal plate is pushed to the bottom of the seat, and the pedals are damaged.

Disclosure of Invention

The present invention has been made to overcome the above-mentioned conventional problems, and an object of the present invention is to provide a manual pedal device for a seat.

In this technical solution, a manual pedal device for a seat is provided, the device includes a frame assembly, a pedal assembly rotatably and slidably connected with the frame assembly, and a locking structure for fixing a rotation angle of the pedal assembly relative to the frame assembly.

The invention provides a pedal device capable of being independently used, which can be used as an independent unit and can be conveniently installed on furniture seat products, in particular to be used for being connected and installed on functional sofa leisure chairs. The pedal device can be installed on a single seat, a double seat and a multi-seat. The installation is also very simple and convenient, as long as the pedal device is fixed below the seat cushion through the screw rod. And the invention is provided with the pedal assembly and the frame assembly which are rotatably and slidably connected, so that the arrangement is that only the pedal assembly needs to be pulled out and pushed back and then can be rotated when in use, thereby realizing the placement or the storage of feet. In addition, due to the design of the locking structure, the pedal plate is always kept in a locked state in the process of pulling out and pushing back the pedal, and the pedal plate cannot rotate upwards under the action of the spring.

Preferably, the frame assembly is composed of four surrounding connecting plates, and the four connecting plates comprise first grooves which are arranged on two sides of the frame assembly oppositely and used for the movement of the pedal assembly and can limit the pedal assembly to move up and down, and first connecting plates and second connecting plates which are connected with the first grooves on the two sides and are arranged oppositely.

Preferably, the first groove is further provided with a second groove which is used for movement of the pedal assembly and can limit the pedal assembly to move left and right, and the first connecting plate is connected with a pedal locking plate used for limiting the movement position of the pedal assembly.

Preferably, pedal assembly includes by footboard, pedal rotation piece, pedal connecting piece, rotation piece and is used for the rolling wheel components in frame subassembly, the footboard all rotates with the pedal one end of rotating piece, pedal connecting piece and is connected, pedal connecting piece revolves the rotation piece with wheel components and is connected, pedal assembly is equipped with the extension spring who is used for providing pedal connecting piece and wheel components pivoted effort.

Preferably, two ends of the roller assembly are provided with an outer roller, an inner roller and a rotating fixing plate, the outer rollers at the two ends are in rolling connection with the first groove, the inner rollers at the other end are in rolling connection with the second groove, and the other ends of the pedal rotating part and the pedal connecting part are in rotating connection with the rotating fixing plate.

Preferably, all be equipped with the mounting on pedal connecting piece and the rotation fixed plate, extension spring is connected with the mounting, be equipped with on the second connecting plate with pedal square hole that rotates the piece joint.

Preferably, a groove is formed in the front end of the pedal connecting piece, a pedal limiting piece used for limiting the rotation of the pedal relative to the state of the pedal connecting piece is arranged on the pedal, and the pedal limiting piece is arranged in the groove and can rotate; the device is also provided with a limiting rubber wheel, the limiting rubber wheel is arranged at the position, adjacent to the rear part of the pedal rotating part, connected with the rotating fixing plate, and the pedal locking plate is provided with a second groove matched with the limiting rubber wheel in a locking state.

Preferably, the roller assembly is provided with an inner side roller fixing plate, the locking structure comprises a locking plate spring part, a locking plate spring and a locking plate rubber wheel, the locking plate is fixedly connected with the inner side roller fixing plate, two ends of the locking plate spring are fixedly connected with the locking plate and the locking plate spring part, and the locking plate rubber wheel is arranged on the pedal assembly.

Preferably, the roller assembly comprises a connecting pipe, an outer roller fixing plate and a tension spring fixing piece, the inner roller is fixed on the inner roller fixing plate, the outer roller is fixed on the outer roller fixing plate, and the locking plate spring piece is fixed on the connecting pipe.

Preferably, the manual pedal device is further provided with a limiting part for preventing the pedal assembly from being pulled out of the frame assembly, and the limiting part comprises a front end limiting screw rod for limiting the pulling-out of the outer side roller, a front end limiting nut, a front end inner side limiting screw rod for limiting the pulling-out of the inner side roller and a front end inner side limiting nut.

Compared with the prior art, the beneficial effects are:

according to the invention, the pedal device is arranged and connected under the seat, the pedals are manually driven by a human body to do horizontal telescopic movement, the overall occupied space of the pedal device is small, and the space under the seat can be maximized. This enables the person to have a larger resting space for the legs when sitting without the discomfort of pushing against the legs. And the whole thickness of the seat can be very thin, so that the whole seat looks more integrated, and the requirement of conciseness and beauty advocated by the current society is met.

The invention is a manual pedal device, which has the advantages of convenient and simple use, simple structure and lower cost than an electric pedal device. Because the electric motor is not used for driving, the pedal is only manually stretched, and the environment is more green.

The pedal device mainly comprises a wheel groove frame component, a pedal component and the like. The footrest is secured to the iron or wood frame of the seat cushion by the wheel well frame assembly. After the whole pedal device is installed, the pedal device can be hidden under the seat and does not occupy the front space position of the seat. The entire footrest is independently operated and is not directly linked to other functions of the seat.

The wheel groove frame component is mainly formed by combining and welding an outer wheel groove, an inner wheel groove, a front fixing plate, a rear fixing plate, a pedal locking plate and the like. The foot pedal assembly is provided with a roller wheel, and the roller wheel can linearly roll back and forth in a guide wheel groove of the wheel groove frame. The pedal device is driven manually, and the pedal assembly is pulled to move back and forth manually.

The pedal plate is always kept in a locked state and cannot rotate upwards under the action of the spring in the process of pulling out and pushing back the pedal due to the design of the locking mechanism. Therefore, the pedal is pulled out and pushed back, only horizontal push-pull force is needed, downward pressure is not needed, and the operation of a user is facilitated.

When the pedal assembly is manually pushed to the rear of the seat, the entire pedal assembly is brought to the lower portion of the seat for storage. When the pedal assembly is pulled manually to move forwards to the foremost end, the pedal extends out of the front part of the seat and rotates to be lifted due to the pulling of the rotating iron sheet and the connecting iron sheet.

When the footrest assembly is manually pulled to the front, the footrest will now be in a position extending out of the seat and raised to lie flat against the seat cushion. At this moment, the user sits on the seat, and the feet of the user are supported, so that the leisure and comfortable effects are achieved.

Drawings

FIG. 1 is a schematic view of the present invention in a state where the footrest is stowed under the seat;

FIG. 2 is a schematic view of the present invention in a state where the footrest is stowed under the seat;

FIG. 3 is a schematic view showing the structure of the present invention in a state where the footrest is stowed under the seat;

FIG. 4 is a schematic view of the present invention in a state where the footrest is stowed under the seat;

FIG. 5 is a schematic structural view of the components of the wheel well frame assembly of the present invention;

FIG. 6 is a schematic structural view of the components of the wheel well frame assembly of the present invention;

FIG. 7 is a schematic structural view of the components of the footrest assembly of the present invention;

FIG. 8 is a schematic structural view of the components of the footrest assembly of the present invention;

FIG. 9 is a schematic structural view of the components of the roller assembly of the present invention;

FIG. 10 is a schematic structural view of the components of the roller assembly of the present invention;

FIG. 11 is a schematic structural view showing a state in which the pedal assembly of the present invention just collides with the limit screw;

FIG. 12 is a schematic structural view showing a state in which the pedal assembly of the present invention just collides with the limit screw;

FIG. 13 is a schematic structural view showing a state in which the footrest assembly just collides with the limit screw in accordance with the present invention;

fig. 14 is a schematic structural view showing a state where the footrest of the present invention is extended to the outside of the seat;

FIG. 15 is a schematic structural view showing a state where the footrest of the present invention is extended to the outside of the seat;

fig. 16 is a schematic structural view showing a state where the footrest of the present invention is extended to the outside of the seat;

FIG. 17 is a view of the footrest in the rear of the seat in accordance with the present invention;

FIG. 18 is a state of the foot rest of the present invention just after extension;

fig. 19 is a state view of the foot board 21 of the present invention when it is extended to the outside;

fig. 20 is a view showing the step plate installed in the seat of the present invention in the rear of the seat and extended to the outside.

FIG. 21 is a schematic view of a portion of the manual step device of the chair of the present invention.

FIG. 22 is a partial schematic view of the manual step device of the chair of the present invention.

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 components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not 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 relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:

examples

Referring to fig. 1 to 22, which are examples of a manual pedaling apparatus for a chair according to the present invention, the apparatus comprises a frame assembly 1, a pedaling assembly 2, wherein the pedaling assembly 2 is rotatably and slidably connected with the frame assembly 1, and the apparatus is provided with a locking structure 3 for fixing a rotation angle of the pedaling assembly 2 relative to the frame assembly 1.

The frame assembly 1 is composed of four surrounding connecting plates, wherein the four connecting plates comprise first grooves 11 which are arranged on two sides of the frame assembly oppositely and used for the movement of the pedal assembly 2 and can limit the pedal assembly 2 to move up and down, and first connecting plates 13 and second connecting plates 14 which are connected with the first grooves 11 on the two sides and are arranged oppositely.

In addition, the first groove 11 is further provided with a second groove 12 which is used for moving the pedal assembly 2 and can limit the pedal assembly 2 to move left and right, and the first connecting plate 13 is connected with a pedal locking plate 15 which is used for limiting the moving position of the pedal assembly 2.

The pedal assembly 2 comprises a pedal 21, a pedal rotating piece 22, a pedal connecting piece 23, a rotating piece 25 and a roller assembly 29 for rolling in the frame assembly 1, the pedal 21 is rotatably connected with one end of the pedal rotating piece 22 and one end of the pedal connecting piece 23, the pedal connecting piece 23 is rotatably connected with the roller assembly 29 around the rotating piece 25, and the pedal assembly 2 is provided with an extension spring 27 for providing the acting force for rotating the pedal connecting piece 23 and the roller assembly 29.

In addition, two ends of the roller assembly 29 are provided with an outer roller 210, an inner roller 211 and a rotation fixing plate 213, the outer rollers 210 at the two ends are connected with the first groove 11 in a rolling manner, the inner rollers 211 at the two ends are connected with the second groove 12 in a rolling manner, and the other ends of the pedal rotation member 22 and the pedal connection member 23 are connected with the rotation fixing plate 213 in a rotating manner.

Wherein, the pedal connector 23 and the rotation fixing plate 213 are both provided with a fixing member 26, the extension spring 27 is connected with the fixing member 26, and the second connecting plate 14 is provided with a square hole 141 which is clamped with the pedal rotation member 22.

In addition, the front end of the pedal connecting piece 23 is provided with a groove, the pedal 21 is provided with a pedal limiting piece 24 for limiting the rotation of the pedal 21 relative to the state of the pedal connecting piece 23, and the pedal limiting piece 24 is arranged in the groove and can rotate; the device is also provided with a limiting rubber wheel 28, the limiting rubber wheel 28 is arranged at the rear part of the pedal rotating piece 22 adjacent to the position connected with the rotating fixing plate 213, and the pedal locking plate 15 is provided with a second groove matched with the limiting rubber wheel 28 in a locking state.

The roller assembly 29 is provided with an inner side roller fixing plate 215, the locking structure 3 includes a locking plate spring part 217, a locking plate 218, a locking plate spring 221 and a locking plate rubber wheel 222, the locking plate 218 is fixedly connected with the inner side roller fixing plate 215, two ends of the locking plate spring 221 are fixedly connected with the locking plate 218 and the locking plate spring part 217, and the locking plate rubber wheel 222 is arranged on the pedal assembly 2.

In addition, the roller assembly 29 includes a connection pipe 212, an outer roller fixing plate 216, and a tension spring fixing member 214, the inner roller 211 is fixed to the inner roller fixing plate 215, the outer roller 210 is fixed to the outer roller fixing plate 216, and the locking plate spring member 217 is fixed to the connection pipe 21).

The manual pedal device is further provided with a limiting part for preventing the pedal assembly from being pulled out of the frame assembly 1, and the limiting part comprises a front end limiting screw 31 for limiting the pulling-out of the outer side roller 210, a front end limiting nut 4, a front end inner side limiting screw 5 for limiting the pulling-out of the inner side roller 211 and a front end inner side limiting nut 6.

Specifically, the method comprises the following steps:

referring to fig. 1 to 4, the stepping device 10 mainly includes a wheel-groove frame assembly 1, a stepping assembly 2, a front-end limit screw 31, a front-end limit nut 4, a front-end inner-side limit screw 5, a front-end inner-side limit nut 6, and the like. The main body of the stepping device 10 is installed by first installing the roller of the stepping assembly 2 into the wheel groove of the wheel groove frame assembly 1. Then, the front end limit screw 31, the front end limit nut 4, the front end inner limit screw 5 and the front end inner limit nut 6 are respectively installed to prevent the pedal assembly 2 from being separated out of the wheel groove frame assembly 1.

As shown in fig. 5 to 6, the wheel well frame assembly 1 is a frame assembly formed by welding a first groove 11 (in this embodiment, a U-shaped wheel well 11), a second groove 12 (in this embodiment, an inner U-shaped wheel well 12), a first connecting plate 13, a second connecting plate 14, and a foot lock plate 15 on both sides. The U-shaped wheel grooves 11 on the two sides are bent iron sheets, and the rollers 210 on the outer sides of the two sides of the pedal assembly 2 roll in the U-shaped wheel grooves 11 on the two sides. The inner U-shaped wheel groove 12 is a bent iron sheet, and the inner roller 211 of the pedal assembly 2 rolls in the inner U-shaped wheel groove 12. The mounting directions of the two side U-shaped wheel grooves 11 and the inner side U-shaped wheel groove 12 are different, the two side U-shaped wheel grooves 11 limit the up-down direction of the roller, and the inner side U-shaped wheel groove 12 limits the left-right direction of the roller. This provides for smooth operation of the tread elements without causing roller jamming and the like. The first connecting plate 13 is an L-shaped bent iron piece, and the second connecting plate 14 is a flat iron piece. The first and second connecting plates 13 and 14 may be used for mounting to a seat cushion.

As shown in fig. 7, fig. 8, fig. 21 and fig. 22, the footrest assembly 2 mainly comprises a footrest 21, a footrest rotating iron sheet 22, a footrest connecting iron sheet 23, a footrest limiting member 24, a rotating member 25, a fixing member 26, an extension spring 27, a limiting rubber wheel 28 and a roller assembly 29, which form a linkage mechanism as a movable component. The pedal assembly 2 is provided as a single movable part, and the pedal link 23 is rotated backward about the rotating member 25 due to the tensile force of the tension spring 27. The step plate 21 always generates a rotational force upward by the link structure formed with the step rotary 22. And the locking plate L-shaped iron piece 220 is fixed to the inner roller fixing plate 215 by screws, and the locking plate 218 is connected with the inner roller fixing plate 215 by pins. The upper portion of the lock plate 218 is sleeved with a lock plate rubber sleeve 219 to reduce collision noise. The pedal rotator 22 has a locking plate rubber wheel 222. The latch plate spring 221 is attached on both sides to the pins of the latch plate 218 and the pins of the latch plate spring iron plate 217. The lock plate 218 is always locked to the lock plate rubber wheel 222 by the lock plate spring 221, so that the pedal mechanism will not rotate and always maintain the lower horizontal position.

The foot board 21 and the foot board welding rod are welded into a whole, the foot rotating piece 22 and the rotating iron sheet welding rod are welded into a whole, and the foot connecting piece 23 and the connecting iron sheet welding rod are welded into a whole. The pedal rotating member 22 is connected to the pedal plate 21 and the rotation fixing plate 213 through the rotating member 25, and the pedal connecting member 23 is connected to the pedal plate 21 and the rotation fixing plate 213 through the rotating member 25. The tension springs 27 are respectively installed on the fixing pieces 26 connecting the iron piece 23 and the rotation fixing plate 213. The pedal rotation member 22 has a recess formed at the front end thereof, and a pedal stopper 24 (a stopper pin in this embodiment) of the pedal 21 is disposed in the recess. A limit rubber wheel 28 is mounted at the rear of the foot-operated turning piece 22.

As shown in fig. 9 to 10, the main body of the roller assembly 29 is formed by welding a square welding pipe 212, a rotation fixing plate 213, an inner roller fixing plate 215, an outer roller fixing plate 216, and a tension spring fixing pin 214. The welded square tube 212 may be a square tube, but is not limited to a square tube, and may be an iron sheet. The inner roller 211 is fixed to the inner roller fixing plate 215. The outer roller 210 is fixed to the inner roller fixing plate 216. The locking plate spring iron sheet 217 is welded on the square tube 212, and the locking plate spring iron sheet 217 is provided with a spring pin.

Fig. 11 to 12 are schematic structural views illustrating a state in which the footrest assembly and the limit screw just collide with each other according to the present invention. When the pedal 21 needs to be pulled out for use, the pedal 21 needs to be pulled forward by keeping manual horizontal pulling. When the outer roller 210 of the footrest assembly 2 collides with the front-end limiting screw 31 and the inner roller 211 of the footrest assembly 2 collides with the front-end inner limiting screw 5, the upper portion of the lock plate 218 collides with the second connecting plate 14, and then the lock plate 218 rotates against the action of the lock plate spring 221, and the lock plate 218 is separated from the lock plate rubber wheel 222. At this time, the pedal 21 is lifted and rotated upward by the tensile force of the tension spring 27 after releasing the hand.

As shown in fig. 13 to 20, when the footboard 21 needs to be pulled out to the outermost portion for use, the footboard 21 needs to be pulled to move forward as well. When the outer roller 210 of the footrest assembly 2 collides with the front end stopper screw 31 and the inner roller 211 of the footrest assembly 2 collides with the front end inner stopper screw 5, the footrest 21 is lifted and rotated upward by the tensile force of the tension spring 27 when the hands are released. When the stopper pin 24 of the foot board 21 presses the front wall of the recess of the foot link 23, the foot board 21 will be in the highest position state. The rear end projection of the pedal rotating member 22 of the pedal assembly 2 enters the square hole of the second connecting plate 14 of the wheel well frame assembly 1. At this time, the pedal assembly 2 is pushed horizontally backward without moving due to the limit action of the rear end of the pedal rotary 22. Due to the limiting function of the front end limiting screw 31 and the front end inner side limiting screw 5, the pedal assembly 2 can not move when being horizontally pulled forwards. Meanwhile, the front end of the foot pedal 21 is not pushed down and moved, and the pedal stopper 24 of the foot pedal 21 abuts against the front wall of the recess of the pedal connector 23 because the position is located at the front end of the rotating rivet 25. At this time, the whole footrest assembly 2 is very stable, and a person sits on the seat, and the footrest 21 supports both feet, thereby achieving a comfortable and leisure state.

When it is desired to retract the footboard 21 to the lower portion of the seat, the rear end portion of the footboard 21 is manually depressed, and thus the footboard stopper 24 of the footboard 21 is rotated in the recess of the footboard connecting member 23 because it is located at the rear end of the rotating rivet 25. The pedal rotation member 22 and the pedal connection member 23 are rotated downward simultaneously, so that the pedal rotation member 22 is disengaged from the square hole 141 of the second connection plate 14 of the wheel groove frame assembly 1. When the lower foot pedal 21 presses the rear wall of the groove of the foot connecting piece 23 through the limit pin 24, the foot pedal 21 is in the lowest position state. When the pedal 21 is pushed to move backwards while keeping the pedal pressed downwards, the upper part of the lock plate 218 is separated from the second connecting plate 14, the lock plate 218 rotates under the action of the lock plate spring 221, the lock plate 218 is locked to the lock plate rubber wheel 222, and the pedal 21 cannot rotate and lift after the hand is released. At this time, the step plate is horizontally pushed inward, and when the limiting rubber wheel 28 at the step rotating piece 22 enters the second groove of the step locking plate 15 of the wheel groove frame assembly 1, the storage locking state of the step device is achieved.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit 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. Manual pedaling apparatus of a chair, characterized in that the apparatus comprises a frame assembly (1), a pedaling assembly (2), the pedaling assembly (2) is rotatably and movably connected with the frame assembly (1), and the apparatus is provided with a locking structure (3) for fixing the rotation angle of the pedaling assembly (2) relative to the frame assembly (1).

2. The manual footrest device for chairs according to claim 1, characterized in that said frame assembly (1) is formed by four surrounding connecting plates, which comprise a first slot (11) with two opposite sides for the movement of the footrest assembly (2) and capable of limiting the up-and-down movement of the footrest assembly (2), and a first connecting plate (13) and a second connecting plate (14) connected to the first slot (11) with two opposite sides and opposite to each other.

3. The manual pedal device of chair as claimed in claim 2, wherein the first slot (11) is further provided with a second slot (12) for movement of the pedal assembly (2) and capable of limiting the left and right movement of the pedal assembly (2), and the first connecting plate (13) is connected with a pedal lock plate (15) for limiting the movement position of the pedal assembly (2).

4. A manual pedal device of a seat according to claim 3, characterized in that the pedal assembly (2) comprises a pedal (21), a pedal rotating member (22), a pedal connecting member (23), a rotating member (25) and a roller assembly (29) for rolling in the frame assembly (1), the pedal (21) is rotatably connected with the pedal rotating member (22) and one end of the pedal connecting member (23), the pedal connecting member (23) is rotatably connected with the roller assembly (29) around the rotating member (25), and the pedal assembly (2) is provided with a tension spring (27) for providing the acting force for rotating the pedal connecting member (23) and the roller assembly (29).

5. The manual pedal device of the seat according to claim 4, wherein the two ends of the roller assembly (29) are provided with an outer roller (210), an inner roller (211) and a rotation fixing plate (213), the outer rollers (210) at the two ends are connected with the first groove (11) in a rolling manner, the inner rollers (211) at the other end are connected with the second groove (12) in a rolling manner, and the other ends of the pedal rotating member (22) and the pedal connecting member (23) are connected with the rotation fixing plate (213) in a rotating manner.

6. The manual pedal device of chair according to claim 5, characterized in that the pedal connecting piece (23) and the rotation fixing plate (213) are provided with fixing pieces (26), the extension spring (27) is connected with the fixing pieces (26), and the second connecting plate (14) is provided with a square hole (141) clamped with the pedal rotating piece (22).

7. The manual pedal device of a seat according to any one of claims 3 to 6, wherein the pedal connecting member (23) is provided with a groove at the front end thereof, the pedal (21) is provided with a pedal stopper (24) for limiting the rotation of the pedal (21) relative to the pedal connecting member (23), and the pedal stopper (24) is rotatably provided in the groove; the device is also provided with a limiting rubber wheel (28), the limiting rubber wheel (28) is arranged at the rear part of the pedal rotating part (22) and is adjacent to the position connected with the rotating fixing plate (213), and the pedal locking plate (15) is provided with a second groove matched with the limiting rubber wheel (28).

8. The manual pedal device of the seat according to claim 4, characterized in that the roller assembly (29) is provided with an inner roller fixing plate (215), the locking structure (3) comprises a locking plate spring element (217), a locking plate (218), a locking plate spring (221) and a locking plate rubber wheel (222), the locking plate (218) is fixedly connected with the inner roller fixing plate (215), two ends of the locking plate spring (221) are fixedly connected with the locking plate (218) and the locking plate spring element (217), and the locking plate rubber wheel (222) is arranged on the pedal assembly (2).

9. The manual pedaling device for chair according to claim 8, wherein said roller assembly (29) comprises a connecting pipe (212), an outer roller fixing plate (216), a tension spring fixing member (214), an inner roller (211) is fixed on the inner roller fixing plate (215), an outer roller (210) is fixed on the outer roller fixing plate (216), and a locking plate spring member (217) is fixed on the connecting pipe (212).

10. The manual pedal device of seat according to claim 1, characterized in that, the manual pedal device is further provided with a limiting member for preventing the pedal assembly from being pulled out of the frame assembly (1), and the limiting member comprises a front end limiting screw (31) for limiting the pulling-out of the outside roller (210), a front end limiting nut (4), a front end inside limiting screw (5) for limiting the pulling-out of the inside roller (211), and a front end inside limiting nut (6).

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