Seat footrest adjusting mechanism and seat

Abstract

The invention discloses various seat footrest adjusting mechanisms and a seat, each seat footrest adjusting mechanism comprises a base and a footrest plate, the footrest plate is provided with a connecting part, the connecting part is rotatably connected to the base, and a control adjusting piece capable of moving along the axis direction of the connecting part is arranged between the base and the connecting part; a positioning assembly is arranged between the control adjusting piece and the connecting part, the control adjusting piece is arranged between the base and the connecting part of the footrest, and the footrest which is opened forwards can be stopped at the corresponding horizontal position or inclined position by means of the positioning assembly between the connecting part and the control adjusting piece. When the seat footrest adjusting mechanism is mounted on a seat, the supporting postures of the footrest can be more diversified, various use requirements of a user are met, and the comfort of a seat pedal is improved.

Description

Technical Field

[0001] The present invention relates to the field of seats, and particularly to a seat footrest adjusting mechanism and a seat. Background Art

[0002] To meet the various usage requirements of people working for long hours, most office chairs or ergonomic chairs are equipped with a footrest mechanism. The footrest mechanism is usually arranged under the seat, including a pull rod that slides back and forth and a footrest plate arranged at the front end of the pull rod. When the footrest plate is needed, the pull rod is pulled out, and the footrest plate is rotated forward to keep it in a supported position; when the footrest plate is not needed, the footrest plate is rotated backward to keep it in a retracted state, and then the pull rod is retracted and the footrest plate is placed under the seat again.

[0003] For example, in the footrest assembly patent with the publication number CN220236465, a first boss is provided on the footrest main body, a groove cooperating with the first rib is provided on the base, and limiting steps are provided at both ends of the groove. When the footrest main body is in the unfolded state, the first boss abuts against one of the limiting steps, and at this time, the footrest main body will not continue to turn downwards. When not in use, the footrest main body is turned backward to the folded position, and the first boss abuts against the other limiting step to keep the footrest main body stable in the retracted state; however, such a design is difficult to meet the needs of users.

[0004] When the user is in a lying-back posture and the legs are kept horizontal, the footrest main body in the above footrest mechanism can be rotated forward and opened at this time to provide support for the legs; but when the user is in a sitting state, the legs are in a state of hanging obliquely downward. At this time, to ensure the sitting comfort of the user, the footrest plate needs to be rotated to a support state that inclines forward and downward to facilitate the user to support the legs that hang naturally or are coiled up. In the above patent, relying on the design of the first boss and the limiting steps at both ends of the groove can only open the footrest main body forward to the horizontal state, and it is difficult to provide leg support for the user in the sitting posture.

[0005] Therefore, it is necessary to develop a seat footrest adjusting mechanism that can meet the user's usage requirements for the footrest in the sitting posture and the lying-back posture while ensuring sitting comfort. Summary of the Invention

[0006] The present invention provides a variety of seat footrest adjusting mechanisms and seats. By arranging a control and adjustment member between the connection part of the base and the footrest plate, and relying on the positioning component between the connection part and the control and adjustment member, the forward-opened footrest plate can stop at the corresponding horizontal position or inclined position; by installing this seat footrest adjusting mechanism on the seat, the support posture of the footrest plate can be more diverse, meeting the various usage requirements of users and improving the comfort of the seat footrest.

[0007] The technical solution of the present invention is realized as follows: A seat footrest adjusting mechanism, comprising a base and a footrest plate. A connecting portion is provided on the footrest plate, and the connecting portion is rotatably connected to the base, so that the footrest plate can rotate forward from the retracted state and switch to the open state; a control adjusting member that can move along the axial direction of the connecting portion is provided between the base and the connecting portion; a positioning assembly is provided between the control adjusting member and the connecting portion. The positioning assembly includes a limiting tooth provided on one of the control adjusting member and the connecting portion, and a plurality of positioning teeth provided on the other of the control adjusting member and the connecting portion and arranged in sequence along the circumferential direction of the rotation of the connecting portion. The axes of two adjacent positioning teeth are offset or interlaced along the axial direction of the connecting portion; When the control adjusting member moves along the axial direction of the connecting portion and makes the limiting tooth and the corresponding positioning tooth in corresponding positions, the connecting portion rotates forward and the limiting tooth contacts the corresponding positioning tooth, so that the footrest plate is held in place at a predetermined horizontal position or inclined position.

[0008] Preferably, there are two positioning teeth. The two positioning teeth are respectively a first positioning tooth and a second positioning tooth arranged in sequence along the circumferential direction of the rotation of the connecting portion. The first positioning tooth and the second positioning tooth are offset or interlaced along the axial direction of the connecting portion; When the control adjusting member moves and makes the limiting tooth correspond to the first positioning tooth, the footrest plate rotates forward from the retracted state, and the first positioning tooth abuts against the limiting tooth. At this time, the footrest plate is in a horizontal support state; when the control adjusting member moves again and makes the position of the limiting tooth switch to correspond to the second positioning tooth, the footrest plate continues to rotate forward until the second positioning tooth abuts against the limiting tooth. At this time, the footrest plate switches from the horizontal support state to an inclined support state that inclines forward and downward.

[0009] Preferably, the limiting tooth is provided on the control adjusting member, and a plurality of positioning teeth are provided on the connecting portion.

[0010] Preferably, a convex tooth adjacent to the plurality of positioning teeth is further provided on the connecting portion or the control adjusting member; when the footrest plate rotates backward from the open state to the retracted state, the convex tooth abuts against the limiting tooth.

[0011] Preferably, along the axial direction of the connecting portion, the length of the convex tooth is greater than the length of the limiting tooth; so that when the control adjusting member slides axially to any corresponding position, it does not affect the convex tooth abutting against the limiting tooth after the connecting portion rotates backward and retracts.

[0012] Preferably, a locking structure is provided between the base and the control adjusting member. The locking structure can lock or unlock the control adjusting member when the limiting tooth corresponds to the first positioning tooth or the second positioning tooth; to prevent the control adjusting member from deviating from the predetermined position after moving in place.

[0013] Preferably, the locking structure includes a limit member arranged on one of the base and the control adjustment member, and two limit grooves spaced apart on the left and right sides of the base and the control adjustment member, the limit member has a hemispherical limit surface, the shape of the limit groove matches the hemispherical limit surface, and the limit member can elastically extend and retract toward the limit groove; the control adjustment member has a locked state and an unlocked state, when the control adjustment member moves to a predetermined position and makes the limit tooth correspond to the position of the first positioning tooth or the second positioning tooth, the limit member elastically extends and makes the hemispherical limit surface snap into one of the limit grooves; at this time, the control adjustment member is in a locked state; external force acts on the control adjustment member and forces the limit member to retract elastically, so that the hemispherical limit surface is out of the corresponding limit groove, and at this time the control adjustment member switches to an unlocked state.

[0014] Preferably, the two limiting grooves are connected via a strip guide groove matching the hemispherical limiting surface; the strip guide groove plays a guiding and transitioning role, making the control and adjustment member move more smoothly.

[0015] Preferably, a strip groove extending along the axial direction of the connecting portion is provided through the base, and a toggle portion extending out of the strip groove is provided on the control adjustment member; the toggle portion is convenient for hand operation, and the strip groove can avoid the movable toggle portion.

[0016] Preferably, the control and adjustment member has an arcuate surface facing the connecting portion, and the limiting teeth are arranged on the arcuate surface; the arcuate surface design can make the control and adjustment member more compatible with the connecting portion.

[0017] Preferably, the footrest comprises two left-right symmetrical support plates, and the two support plates are connected via the connecting portion.

[0018] A seat footrest adjustment mechanism comprises a base and a footrest, wherein a connecting portion is arranged on the footrest, and the connecting portion is rotatably connected to the base, so that the footrest can be rotated forward from a retracted state and switched to an open state; a control adjustment member is arranged between the base and the connecting portion; the control adjustment member can move along the axial direction of the connecting portion; a positioning assembly is arranged between the control adjustment member and the connecting portion, and the positioning assembly comprises a limiting tooth arranged on one of the control adjustment member and the connecting portion, and a matching tooth arranged on the other of the control adjustment member and the connecting portion, and the matching tooth comprises a plurality of positioning portions arranged in sequence along the circumferential direction of the rotation of the connecting portion, and every two adjacent positioning portions are integrally formed and staggered with each other along the axial direction of the connecting portion; When the control regulating member moves along the axis direction of the connecting part and makes the limiting teeth correspond to the corresponding positioning parts, the connecting part rotates forward and makes the limiting teeth contact with the corresponding positioning parts, so that the footrest is kept in place at a predetermined horizontal position or inclined position.

[0019] A seat footrest adjustment mechanism comprises a base and a footrest, wherein a connecting portion is provided on the footrest, and the connecting portion is rotatably connected to the base, so that the footrest can be rotated forward from a retracted state and switched to an open state; a control adjustment member is provided between the base and the connecting portion; the control adjustment member can move along the axial direction of the connecting portion; a positioning assembly is provided between the control adjustment member and the connecting portion, and the positioning assembly comprises a limiting tooth arranged on one of the control adjustment member and the connecting portion, and a matching groove arranged on the other of the control adjustment member and the connecting portion, and the limiting tooth is inserted into the matching groove; the matching groove comprises a plurality of sub-grooves extending along the axial direction of the connecting portion, and every two adjacent sub-grooves are connected to each other, and the plurality of sub-grooves are arranged along the circumferential direction of the rotation of the connecting portion, and the extension lengths of the plurality of sub-grooves decrease step by step, thereby forming a plurality of positioning wall surfaces arranged in sequence along the axial direction of the connecting portion in the matching groove; When the control adjusting member moves along the axial direction of the connecting part and makes the limiting teeth correspond to the corresponding positioning wall surface, the connecting part rotates forward and makes the limiting teeth contact the corresponding positioning wall surface, so that the footrest is kept in place at a predetermined horizontal position or inclined position.

[0020] A seat comprises the seat footrest adjustment mechanism.

[0021] The beneficial effects of the present invention using the above technical solution are: The present invention provides an axially movable control adjustment member between the connecting portion and the base, and through the cooperation of the limiting teeth between the control adjustment member and the connecting portion and a plurality of positioning teeth distributed along the circumferential direction and staggered or offset along the axial direction, the limiting teeth can switch positions under the drive of the control adjustment member and abut against the corresponding positioning teeth, so that the footrest rotated into position is maintained in a predetermined horizontal or inclined position, thereby supporting the user's legs that need to be laid flat or folded up, while ensuring comfort, meeting the user's usage needs and improving the user experience.

[0022] A convex tooth adjacent to a plurality of positioning teeth is provided on the connecting portion, and the length of the convex tooth is greater than the length of the limiting tooth. This design ensures that when the limiting tooth slides to a position corresponding to any positioning tooth, it will not be misaligned with the convex tooth. The user can directly rotate the footrest backward and switch it to the retracted state. The design is simple and practical, ensuring that the footrest can stop at the initial position when retracted backward.

[0023] A locking structure is also provided between the base and the control adjustment member, and the locking structure includes a limit groove and an elastic telescopic limit member with a hemispherical limit surface. When the control adjustment member slides into place, the hemispherical limit surface can cooperate with the limit groove to prevent the control adjustment member from accidentally leaving the predetermined position, which makes it difficult for the footrest to support the legs. When the position of the control adjustment member needs to be changed, only force is needed to act on the toggle part to overcome the limit force and separate the limit member from the limit groove, thereby ensuring the stability of the control adjustment member and retaining a strong sense of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a seat footrest adjustment mechanism; Figure 2 This is an exploded view of the seat footrest adjustment mechanism; Figure 3 It is a side view of the seat footrest adjustment mechanism in the horizontal support state; Figure 4 It is a side view of the seat footrest adjustment mechanism in the tilt support state; Figure 5 It is a cross-sectional view of the limiting tooth abutting against the first positioning tooth in the horizontal support state; Figure 6 It is a cross-sectional view of the limiting tooth abutting against the second positioning tooth in the inclined supporting state; Figure 7 A cross-sectional view of the limit tooth abutting against the convex tooth in the retracted state; Figure 8 It is a structural schematic diagram of the control adjustment member; Figure 9 It is a schematic diagram of the installation of the limiter on the base; Figure 10 It is a schematic diagram of the structure of each positioning tooth on the connecting part; Figure 11 A schematic diagram showing a control member driving the limiting tooth to move from the first positioning tooth to the second positioning tooth; Figure 12 It is a schematic diagram of the limiting tooth abutting against the second positioning tooth after the footrest continues to rotate forward; Figure 13 A schematic diagram of two positioning teeth interlaced with each other; Figure 14 This is a schematic diagram of the switching of the limiting tooth between the first positioning portion and the second positioning portion in Example 2; Figure 15 This is a structural diagram of the matching groove on the connecting part in Example 3; Figure 16 Schematic diagram of the switching of the limiting teeth between multiple positioning wall surfaces in Example 3; The figures are marked as follows: 1-support plate, 2-base, 3-control adjustment member, 4-limiting member, 5-pull rod, 6-mounting seat, 11-connecting part, 12-first positioning tooth, 12a-first positioning part, 13-second positioning tooth, 13a-second positioning part, 14-convex tooth, 15-dividing groove, 15a-matching groove, 21-upper shell, 22-lower shell, 31-sliding part, 32-limiting tooth, 33-limiting groove, 34-strip guide groove, 151-positioning wall, 211-mounting hole, 221-strip groove. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0026] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0027] The present invention has multiple embodiments, and the specific embodiments are as follows: Embodiment 1: As Figure 1-13 shown, this embodiment provides a seat footrest adjustment mechanism, including a base 2 and a footrest plate. A connecting portion 11 is provided on the footrest plate, and the connecting portion 11 is rotatably connected to the base 2, so that the footrest plate can rotate forward from the retracted state and switch to the open state; for the convenience of installation, the base 2 is a split structure, and the base 2 includes an upper half shell 21 and a lower half shell 22 that are vertically aligned and detachably connected together. The connecting portion 11 is a cylindrical structure, and two semi-circular grooves are provided on both the upper half shell 21 and the lower half shell 22. After the upper half shell 21 and the lower half shell 22 are aligned, a rotating shaft hole for rotatably connecting with the connecting portion 11 is formed; a control adjustment member 3 that can move along the axial direction of the connecting portion 11 is provided between the base 2 and the connecting portion 11; a positioning assembly is provided between the control adjustment member 3 and the connecting portion 11. The positioning assembly includes a limiting tooth 32 provided on one of the control adjustment member 3 and the connecting portion 11, and a plurality of positioning teeth provided on the other of the control adjustment member 3 and the connecting portion 11 and arranged in sequence along the circumferential direction of the rotation of the connecting portion 11. The axes of any two adjacent positioning teeth are offset or staggered along the axial direction of the connecting portion 11; When the control adjustment member 3 moves along the axial direction of the connecting portion 11 and makes the limiting tooth 32 and the corresponding positioning tooth in corresponding positions, the connecting portion 11 rotates forward and the limiting tooth 32 contacts the corresponding positioning tooth, so that the footrest plate is held in place at a predetermined horizontal position or inclined position.

[0028] Furthermore, in this embodiment, the limiting tooth 32 can be provided on the connecting portion 11 or on the control adjustment member 3. In this embodiment, the case where the limiting tooth 32 is provided on the control adjustment member 3 and a plurality of positioning teeth are provided on the connecting portion 11 will be explained; to match the outer wall surface of the connecting portion 11, the control adjustment member 3 has an arc surface facing the connecting portion 11, and the limiting tooth 32 is provided on the arc surface; as Figure 3-6As shown, there are two positioning teeth. The two positioning teeth are respectively the first positioning tooth 12 and the second positioning tooth 13 arranged in sequence along the circumferential direction of the rotation of the connecting portion 11. The rotation direction when the connecting portion 11 rotates forward to open is the clockwise direction, and the rotation direction when it rotates backward to retract is the counterclockwise direction. The first positioning tooth 12 and the second positioning tooth 13 are offset or interlaced along the axial direction of the connecting portion 11; the first positioning tooth 12 is closer to the clockwise side; When the control adjusting member 3 is activated and the limiting tooth 32 corresponds to the position of the first positioning tooth 12, the footrest rotates forward from the retracted state, and the first positioning tooth 12 abuts against the limiting tooth 32. At this time, the footrest is in a horizontal support state, so as to support the horizontal legs when the user leans backward; when the control adjusting member 3 is activated again and the position of the limiting tooth 32 is switched to correspond to the position of the second positioning tooth 13, a rotation space is formed between the second positioning tooth 13 and the limiting tooth 32, and the footrest continues to rotate forward until the second positioning tooth 13 abuts against the limiting tooth 32. At this time, the footrest is switched from the horizontal support state to an inclined support state that slopes forward and downward, so as to support the coiled legs when the user leans backward.

[0029] Furthermore, as Figure 2 shown, corresponding markings are also provided on the outer wall of the base 2. The markings are used to display the movement direction and position information of the control adjusting member 3. For example, the markings in this embodiment include two arrows in opposite directions and the numbers "1" and "2" near the two arrows. "1" represents that the control adjusting member 3 moves to correspond to the position of the second positioning tooth 13, and "2" represents that the control adjusting member 3 moves to correspond to the position of the first positioning tooth 12, so as to facilitate the user's operation and identification.

[0030] Furthermore, as Figure 7 shown, when the limiting tooth 32 abuts against any positioning tooth and the user needs to rotate backward and retract the footrest, in order to ensure that the retracted footrest can be kept in the corresponding retracted position, a convex tooth 14 adjacent to the multiple positioning teeth is also provided on the connecting portion 11 or the control adjusting member 3; when the footrest rotates backward from the open state to the retracted state, the convex tooth 14 abuts against the limiting tooth 32 to keep the footrest in the corresponding position after retraction.

[0031] Furthermore, to ensure that the limiting tooth 32 at the corresponding position can abut against and cooperate with the convex tooth 14 after the footrest rotates backward and retracts, in this embodiment, along the axial direction of the connecting portion 11, the length of the convex tooth 14 is greater than the length of the limiting tooth 32, so that the convex tooth 14 can always correspond to the position of the limiting tooth 32. When the control adjusting member 3 slides axially to any corresponding position, it does not affect the convex tooth 14 abutting against the limiting tooth 32 after the connecting portion 11 rotates backward and retracts, ensuring that the retracted footrest is in a stable state.

[0032] Furthermore, asFigure 8-9 As shown, in order to facilitate the control of the position of the control adjustment member 3, a locking structure is provided between the base 2 and the control adjustment member 3, and the locking structure can lock or unlock the control adjustment member 3 when the limiting tooth 32 corresponds to the first positioning tooth 12 or the second positioning tooth 13, so as to prevent the control adjustment member 3 from leaving the predetermined position after it is in place; specifically, the locking structure includes a limiting member 4 arranged on one of the base 2 and the control adjustment member 3, and two limiting grooves 33 spaced apart from each other on the other of the base 2 and the control adjustment member 3. In this embodiment, the limiting member 4 is arranged on the base 2, and the limiting groove 33 is arranged on the control adjustment member 3 for explanation; the limiting member 4 has a hemispherical limiting surface, and the shape of the limiting groove 33 matches the hemispherical limiting surface, and the limiting member 4 can elastically expand and contract toward the limiting groove 33; wherein the limiting member 4 can be an elastic member that expands and contracts through its own elastic deformation. The control member 3 may be a movable member that is elastically retracted and retracted by a spring. For example, the limit member 4 in this embodiment is stuck in a ball in a mounting seat, and the hemispherical surface of the ball is exposed outside the mounting seat. A mounting hole 211 is provided on the base 2, and the mounting seat is fixed in the mounting hole 211. A compression spring that acts on the ball is provided in the mounting seat; the control adjustment member 3 has a locked state and an unlocked state. When the control adjustment member 3 moves to a predetermined position and makes the limit tooth 32 correspond to the position of the first positioning tooth 12 or the second positioning tooth 13, the limit member 4 elastically extends out and makes the hemispherical limit surface stuck in one of the limit grooves 33; at this time, the control adjustment member 3 is in a locked state; an external force acts on the control adjustment member 3 and forces the limit member 4 to retract elastically, so that the hemispherical limit surface escapes from the corresponding limit groove 33. At this time, the control adjustment member 3 switches to an unlocked state so that the limit tooth 32 corresponds to the position of the next positioning tooth.

[0033] Furthermore, in order to ensure that the limit member 4 will not get stuck with the control adjustment member 3 after it escapes from the limit groove 33, the two limit grooves 33 are connected by a strip guide groove 34 that matches the hemispherical limit surface; the strip guide groove 34 plays a guiding transition role, so that when the control adjustment member 3 moves, the limit member 4 forms a sliding connection with the strip guide groove 34, making the sliding process of the limit member 4 smoother after it escapes from the limit groove 33.

[0034] Furthermore, in order to facilitate the user to operate the control adjustment member 3, a strip groove 221 extending along the axial direction of the connecting portion 11 is provided on the base 2, and a toggle portion 31 extending out of the strip groove 221 is provided on the control adjustment member 3; the toggle portion 31 is an inverted triangular block, which is convenient for hand operation, and the strip groove 221 can avoid the toggle portion 31. At the same time, the width of the strip groove 221 can also be set to match the toggle portion 31, so that the toggle portion 31 and the strip groove 221 form a sliding connection, thereby improving the smoothness of the operation.

[0035] Furthermore, in order to support the user's legs and prevent the footrest from interfering with the base 2 during forward and backward rotation, the footrest in this embodiment includes two symmetrically arranged support plates 1 on the left and right, and the two support plates 1 are connected by the connecting portion 11.

[0036] Furthermore, a seat is provided, including the seat footrest adjustment mechanism described above. Specifically, a pull rod 5 is connected to the rear end of the base 2, and a mounting seat 6 is provided at the rear end of the pull rod 5. The pull rod 5 is slidably connected to the mounting seat 6 in the front-back direction. The mounting seat 6 can be fixedly connected to the lower end of the seat cushion of the seat. When the footrest is needed, the pull rod 5 is pulled out, the footrest is rotated forward, and then the rotation-adjusting member 3 is controlled to keep the rotated footrest in the corresponding support position.

[0037] Embodiment 2: The difference between this embodiment and the above embodiment is that, as Figure 14 shown, the structure of the positioning component in this embodiment is different from that of the above embodiment. The positioning component between the control adjusting member 3 and the connecting portion 11 includes a limiting tooth 32 provided on one of the control adjusting member 3 and the connecting portion 11, and a mating tooth provided on the other of the control adjusting member 3 and the connecting portion 11. The mating tooth includes a plurality of positioning portions arranged in sequence along the circumferential direction of the rotation of the connecting portion 11. In this embodiment, the explanation is made with the mating tooth provided on the connecting portion 11 and the limiting tooth 32 provided on the control adjusting member 3; each two adjacent positioning portions are integrally formed and staggered with each other along the axial direction of the connecting portion 11; When the control adjusting member 3 moves along the axial direction of the connecting portion 11 and makes the positions of the limiting tooth 32 and the corresponding positioning portion correspond, the connecting portion 11 rotates forward and the limiting tooth 32 contacts the corresponding positioning portion, so that the footrest is kept in place at a predetermined horizontal position or inclined position; for example, in this embodiment, two mutually staggered and integrally formed positioning portions, when the limiting tooth 32 corresponds to one of the corresponding positioning portions, the footrest rotates forward from the retracted state, and the first positioning tooth 12 abuts against the corresponding positioning portion. At this time, the footrest is in a horizontal support state, so as to support the horizontal legs when the user reclines; when the control adjusting member 3 moves again and makes the position of the limiting tooth 32 switch to correspond to the position of the corresponding other positioning portion, a rotation space is formed between the other positioning portion and the limiting tooth 32, and the footrest continues to rotate forward until the other positioning portion abuts against the limiting tooth 32. At this time, the footrest switches from the horizontal support state to the inclined support state inclined forward and downward, so as to support the coiled legs when the user reclines; thus achieving the same support effect as in the above embodiment.

[0038] Embodiment 3: The difference between this embodiment and the above embodiment is that, as Figure 15-16As shown, in this embodiment, the structure of the positioning component is different from that of the above embodiment. The positioning component between the control adjusting member 3 and the connecting portion 11 includes a limiting tooth 32 provided on one of the control adjusting member 3 and the connecting portion 11, and a mating groove 15a provided on the other of the control adjusting member 3 and the connecting portion 11. In this embodiment, the mating groove 15a is provided on the connecting portion 11 and the limiting tooth 32 is provided on the control adjusting member 3 for explanation; the limiting tooth 32 is inserted into the mating groove 15a; to save the space occupied by the positioning component; the mating groove 15a includes a plurality of sub-grooves 15 extending in the axial direction of the connecting portion 11, and every two adjacent sub-grooves 15 communicate with each other. The plurality of sub-grooves 15 are arranged in the circumferential direction of the rotation of the connecting portion 11 and the extending lengths of the plurality of sub-grooves 15 decrease gradually, thereby forming a plurality of positioning wall surfaces 151 arranged in sequence in the axial direction of the connecting portion 11 within the mating groove 15a; When the control adjusting member 3 moves in the axial direction of the connecting portion 11 and the positions of the limiting tooth 32 and the corresponding positioning wall surface 151 are corresponding, the connecting portion 11 rotates forward and the limiting tooth 32 contacts the corresponding positioning wall surface 151, so that the footrest is held in place at a predetermined horizontal position or inclined position; for example, the mating groove 15a in this embodiment has three positioning wall surfaces 151 arranged in sequence in the axial direction of the connecting portion 11. When the limiting tooth 32 corresponds to one of the corresponding positioning wall surfaces 151, the footrest can rotate forward, and the first positioning tooth 12 abuts against one of the corresponding positioning wall surfaces 151. At this time, the footrest is in a horizontal support state, so as to support the horizontal legs when the user leans back; when the control adjusting member 3 moves again and the position of the limiting tooth 32 is switched to correspond to another corresponding positioning wall surface 151, a rotation space is formed between the other positioning wall surface 151 and the limiting tooth 32, and the footrest continues to rotate forward until the other positioning wall surface 151 abuts against the limiting tooth 32. At this time, the footrest is switched from the horizontal support state to an inclined support state that inclines forward and downward, so as to support the coiled legs when the user leans back; if the inclined support angle needs to be adjusted again, the control adjusting member 3 can be moved again to make the last positioning wall surface 151 abut against the limiting tooth 32, so that the footrest is held at the corresponding position at a larger inclined angle, achieving the same support effect as in the above embodiment.

[0039] The above schematically describes the present invention and its embodiments. This description is not restrictive, and only one of the embodiments of the present invention is shown in the drawings. The actual structure is not limited to this. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural modes and embodiments without creative work without departing from the purpose of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A seat footrest adjustment mechanism, characterized in that: The footrest comprises a base (2) and a footrest, wherein a connecting portion (11) is provided on the footrest, and the connecting portion (11) is rotatably connected to the base (2), so that the footrest can be rotated forward from a retracted state and switched to an open state; a control adjustment member (3) movable along the axial direction of the connecting portion (11) is provided between the base (2) and the connecting portion (11); a positioning assembly is provided between the control adjustment member (3) and the connecting portion (11), and the positioning assembly comprises a limiting tooth (32) provided on one of the control adjustment member (3) and the connecting portion (11), and a plurality of positioning teeth provided on the other of the control adjustment member (3) and the connecting portion (11) and arranged in sequence along the circumferential direction of the rotation of the connecting portion (11), and every two adjacent positioning teeth are staggered or interlaced along the axial direction of the connecting portion (11); When the control adjustment member (3) moves along the axial direction of the connecting portion (11) and makes the limiting teeth (32) and the corresponding positioning teeth correspond to each other, the connecting portion (11) rotates forward and makes the limiting teeth (32) contact with the corresponding positioning teeth, so that the footrest is kept in place at a predetermined horizontal position or inclined position.

2. A seat footrest adjustment mechanism according to claim 1, characterized in that: There are two positioning teeth, which are respectively a first positioning tooth (12) and a second positioning tooth (13) which are arranged in sequence along the circumferential direction of rotation of the connecting portion (11); the first positioning tooth (12) and the second positioning tooth (13) are staggered or interlaced along the axial direction of the connecting portion (11); When the control adjustment member (3) is activated and the position of the limiting tooth (32) corresponds to the position of the first positioning tooth (12), the footrest rotates forward from the retracted state and the first positioning tooth (12) abuts against the limiting tooth (32), and the footrest is in a horizontal support state; when the control adjustment member (3) is activated again and the position of the limiting tooth (32) is switched to correspond to the position of the second positioning tooth (13), the footrest continues to rotate forward until the second positioning tooth (13) abuts against the limiting tooth (32), and the footrest is switched from the horizontal support state to an inclined support state tilted forward and downward.

3. A seat footrest adjustment mechanism according to claim 1 or 2, characterized in that: The limiting teeth (32) are arranged on the control adjustment member (3), and a plurality of positioning teeth are arranged on the connecting portion (11).

4. A seat footrest adjustment mechanism according to claim 3, characterized in that: The connecting portion (11) or the control adjustment member (3) is also provided with a convex tooth (14) adjacent to the plurality of positioning teeth; when the footrest rotates backward from the open state to the retracted state, the convex tooth (14) abuts against the limiting tooth (32).

5. A seat footrest adjustment mechanism according to claim 4, characterized in that: Along the axial direction of the connecting portion (11), the length of the protruding tooth (14) is greater than the length of the limiting tooth (32).

6. The seat footrest adjustment mechanism according to claim 1, characterized in that: A locking structure is provided between the base (2) and the control and adjustment member (3), and the locking structure can lock or unlock the control and adjustment member (3) when the limiting tooth (32) corresponds to the first positioning tooth (12) or the second positioning tooth (13).

7. A seat footrest adjustment mechanism according to claim 6, characterized in that: The locking structure comprises a limiting member (4) arranged on one of the base (2) and the control and adjustment member (3), and two limiting grooves (33) arranged on the other of the base (2) and the control and adjustment member (3) at intervals from each other. The limiting member (4) has a hemispherical limiting surface, the shape of the limiting groove (33) matches the hemispherical limiting surface, and the limiting member (4) can elastically expand and contract toward the limiting groove (33); the control and adjustment member (3) has a locked state and an unlocked state. When the control and adjustment member (3) moves to a predetermined position and the limiting tooth (32) corresponds to the position of the first positioning tooth (12) or the second positioning tooth (13), the limiting member (4) elastically extends and the hemispherical limiting surface is clamped into one of the limiting grooves (33); at this time, the control and adjustment member (3) is in the locked state; an external force acts on the control and adjustment member (3) and forces the limiting member (4) to elastically retract, so that the hemispherical limiting surface escapes from the corresponding limiting groove (33), and at this time, the control and adjustment member (3) switches to the unlocked state.

8. The seat footrest adjustment mechanism according to claim 7, characterized in that: The two limiting grooves (33) are connected via a strip-shaped guide groove (34) matching the hemispherical limiting surface.

9. The seat footrest adjustment mechanism according to claim 1, characterized in that: The base (2) is provided with a strip groove (221) extending along the axial direction of the connecting portion (11), and the control adjustment member (3) is provided with a toggle portion (31) extending out of the strip groove (221).

10. The seat footrest adjustment mechanism according to claim 3, characterized in that: The control adjustment member (3) has an arcuate surface facing the connecting portion (11), and the limiting teeth (32) are arranged on the arcuate surface.

11. The seat footrest adjustment mechanism according to claim 1, characterized in that: The footrest comprises two left-right symmetrical support plates (1), and the two support plates (1) are connected via the connecting portion (11).

12. A seat footrest adjustment mechanism, characterized in that: The footrest comprises a base (2) and a footrest, wherein a connecting portion (11) is provided on the footrest, and the connecting portion (11) is rotatably connected to the base (2), so that the footrest can be rotated forward from a retracted state and switched to an open state; a control adjustment member (3) is provided between the base (2) and the connecting portion (11); the control adjustment member (3) can move along the axial direction of the connecting portion (11); a positioning assembly is provided between the control adjustment member (3) and the connecting portion (11), and the positioning assembly comprises a limiting tooth (32) provided on one of the control adjustment member (3) and the connecting portion (11), and a matching tooth provided on the other of the control adjustment member (3) and the connecting portion (11), and the matching tooth comprises a plurality of positioning portions arranged in sequence along the circumferential direction of the connecting portion (11), and each two adjacent positioning portions are integrally formed and staggered along the axial direction of the connecting portion (11); When the control adjustment member (3) moves along the axial direction of the connecting portion (11) and makes the limiting teeth (32) and the corresponding positioning portion correspond to each other, the connecting portion (11) rotates forward and makes the limiting teeth (32) contact with the corresponding positioning portion, so that the footrest is kept in place at a predetermined horizontal position or inclined position.

13. A seat footrest adjustment mechanism, characterized in that: The footrest comprises a base (2) and a footrest, wherein a connecting portion (11) is provided on the footrest, and the connecting portion (11) is rotatably connected to the base (2), so that the footrest can be rotated forward from a retracted state and switched to an open state; a control adjustment member (3) is provided between the base (2) and the connecting portion (11); the control adjustment member (3) can move along the axial direction of the connecting portion (11); a positioning assembly is provided between the control adjustment member (3) and the connecting portion (11), and the positioning assembly comprises a limiting tooth (32) provided on one of the control adjustment member (3) and the connecting portion (11), and a tooth (32) provided on the control adjustment member (3) and the connecting portion (11). A matching groove (15a) is formed on the section (3) and the other of the connecting parts (11), and the limiting tooth (32) is inserted into the matching groove (15a); the matching groove (15a) comprises a plurality of sub-grooves (15) extending along the axial direction of the connecting part (11), and every two adjacent sub-grooves (15) are interconnected. The plurality of sub-grooves (15) are arranged along the circumferential direction of the connecting part (11) and the extension lengths of the plurality of sub-grooves (15) decrease step by step, thereby forming a plurality of positioning wall surfaces (151) arranged along the axial direction of the connecting part (11) in the matching groove (15a); When the control adjustment member (3) moves along the axial direction of the connecting portion (11) and makes the limiting teeth (32) and the corresponding positioning wall surface (151) correspond to each other, the connecting portion (11) rotates forward and makes the limiting teeth (32) contact with the corresponding positioning wall surface (151), so that the footrest is kept in place at a predetermined horizontal position or inclined position.

14. A seat, characterized in that: It comprises the seat footrest adjustment mechanism as described in any one of claims 1-13.

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