Foot supporting mechanism

Abstract

The utility model discloses a foot supporting mechanism which comprises a pedal body and a connecting frame, the pedal body is provided with an installation cavity, the connecting frame is provided with a connecting rod, ratchets are distributed on the connecting rod, a limiting block is installed in the installation cavity through an elastic piece, the limiting block is provided with clamping teeth meshed with the ratchets to achieve one-way locking, and the side edge of the connecting rod is provided with a guide groove. A slidable ejection block is arranged in the limiting block, the limiting block is provided with a positioning groove and a placement groove, and when the ejection block slides into the positioning groove, the limiting block is ejected, the clamping teeth and the ratchets are separated, unlocked and kept; when the top block slides back to the placement groove, the limiting block resets, the clamping teeth are meshed again, the mechanism can adjust locking and unlocking of the rotation angle of the pedal body, a user can use and reset the pedal without additional operation, different user requirements are met, operation is convenient and fast, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mechanism for putting feet or legs on a seat, in particular to a foot support mechanism of a seat. BACKGROUND

[0002] The foot support mechanism is a key component of the seat, which can provide stable support for the user's feet or legs, thereby reducing the fatigue of the feet or legs, especially in the case of long-term riding, which can significantly improve the overall comfort. For example, in application scenarios such as office chairs and massage chairs, appropriate footrest height and angle can help the user maintain the correct sitting posture, reduce the pressure on the waist and back, and thus improve the overall riding experience. Most chairs on the market generally have folding and reversible footrests as foot support mechanisms, however, many folding and reversible footrests have certain limitations in function. Although it is convenient to flip out for use, the function is limited. These footrests can mostly only complete folding and unfolding operations, cannot be fixed at multiple angles, and are difficult to meet the diverse needs of users for different foot or leg support heights and angles. SUMMARY

[0003] The utility model provides a simple structure, can lock the footrest firmly in multiple angles, and the unlocking and resetting operation is simple.

[0004] The foot support mechanism, comprising a connecting frame slidingly arranged under a seat cushion and a footrest body reversibly connected to the connecting frame, the footrest body is provided with a mounting cavity, the connecting frame is provided with a connecting rod penetrating through the mounting cavity, a part of the connecting rod located in the mounting cavity is provided with a fixing member, a limiting block synchronously rotating with the footrest body around the connecting rod is mounted in the mounting cavity through an elastic member, and the side of the limiting block facing the fixing member is provided with a tooth; the side of the fixing member opposite to the tooth is provided with a ratchet tooth engaged with the tooth, the end of the fixing member is further provided with a guide groove extending along the circumference of the connecting rod, a top block abutting against the limiting block and slidable in the guide groove is mounted in the guide groove, the position of the limiting block opposite to the guide groove is provided with a positioning groove, and the side of the limiting block located in the positioning groove is further provided with a placement groove for accommodating the top block and slightly deeper than the positioning groove; when the top block slides from the placement groove into the positioning groove, the limiting block is away from the fixing member and keeps the state of compressing the elastic member, so that the tooth is separated from the ratchet tooth.

[0005] The foot support mechanism, through the engagement of the clamping teeth of the limiting block and the ratchet teeth on the connecting rod, realizes one-way locking of the footrest in the opening direction, when the footrest body rotates in the opening direction, the engagement of the clamping teeth and the ratchet teeth can effectively prevent reverse rotation of the footrest body, and the footrest body can be fixed at any rotation angle, so that the footrest is in a fully open or open state at any angle, thereby adapting to the support requirements of different users on the feet and / or legs; when the footrest body continues to rotate to the bottom, the top block slides into the positioning groove from the installation groove of the limiting block under the limiting action of the guide groove, the limiting block is away from the fixed part, so that the clamping teeth and the ratchet teeth are separated and kept, thereby realizing automatic unlocking, so that the user can easily reset the footrest body when not needing to put feet or legs, and the operation convenience is improved; when it is needed to fold the footrest body, it is only needed to rotate in the opposite direction until the top block slides out of the positioning groove and is reset in the installation groove under the limiting action of the guide groove, and the limiting block is reset under the action of the elastic member, so that the clamping teeth can be engaged with the ratchet teeth again, the locking state is restored, and the footrest body is fixed in the folded storage state. The utility model realizes locking and unlocking through simple mechanical structure, and the user can complete the unfolding use and reset storage of the footrest without additional operation, and the footrest can be fixed at different heights and angles, different support requirements of the user on the feet and / or legs are met, and the user experience is improved.

[0006] As a preferred scheme of the utility model, the fixed part includes two detachable semicylindrical structures, the semicylindrical structure is provided with a fixed column penetrating through the connecting rod, and a screw is screwed into the fixed column to firmly assemble with the connecting rod.

[0007] As a preferred scheme of the utility model, the guide groove is located at both ends of the outer side wall of the fixed part, the extension direction of the guide groove is consistent with the circumferential track of the footrest body rotating around the connecting rod, the ratchet teeth are located on the outer side wall of the fixed part between the two guide grooves, and the limiting block is installed on one side of the outer side wall of the fixed part.

[0008] As a preferred scheme of the utility model, the sliding length of the guide groove is greater than the distribution length of the ratchet teeth.

[0009] As a preferred scheme of the utility model, the side of the top block facing the fixed part is provided with an arc-shaped contact surface matched with the outer arc surface of the fixed part, so as to ensure that the top block is closely combined with the outer surface of the connecting rod.

[0010] As a preferred scheme of the utility model, the guide groove is located at both ends of the inner side wall of the fixed part, the extension direction of the guide groove is consistent with the circumferential track of the footrest body rotating around the connecting rod, the ratchet teeth are arranged at the edges of the two end portions of the fixed part, the limiting block is in a semicircular ring shape and is installed on one side of the end portion of the fixed part, and the side of the limiting block facing the ratchet teeth is provided with clamping teeth engaged with the ratchet teeth.

[0011] As a preferred scheme of the utility model, the arc-shaped slope is connected between the side wall of the locating groove and the arranging groove, so that the top block can smoothly slide along the arc-shaped slope between the arranging groove and the locating groove.

[0012] As a preferred scheme of the utility model, the bottom of the locating groove extends downward to form a groove, and the top block is provided with a protrusion matched with the groove, so that the protrusion of the top block is embedded in the groove of the locating groove.

[0013] As a preferred scheme of the utility model, the elastic member is a spring. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic view of a foot support mechanism.

[0015] Figure 2 It is an exploded schematic view of a foot support mechanism Figure 1 .

[0016] Figure 3 It is an exploded schematic view of a foot support mechanism Figure 2 .

[0017] Figure 4 It is a structural schematic view of the fixing member and the limiting block assembled in the mounting cavity.

[0018] Figure 5 It is an assembling schematic view of the fixing member and the limiting block.

[0019] Figure 6 It is a top view of a foot support mechanism.

[0020] Figure 7 It is Figure 6 A-A direction sectional view.

[0021] Figure 8 It is Figure 7 B part enlarged view.

[0022] Figure 9 It is a schematic view of a foot support mechanism in use state change.

[0023] Figure 10 It is a schematic view of another foot support mechanism.

[0024] Figure 11 It is a connecting frame structural schematic view.

[0025] Figure 12 It is a limiting block structural schematic view.

[0026] Figure 13 It is a limiting block structural schematic view of another embodiment.

[0027] Figure 14 This is a schematic diagram of the top block structure.

[0028] Figure 15 Schematic diagram of a foot support mechanism according to another embodiment Figure 1 .

[0029] Figure 16 Schematic diagram of a foot support mechanism according to another embodiment Figure 2 .

[0030] Figure 17 This is a schematic diagram of the assembly of the fastener and the limiting block according to another embodiment.

[0031] Figure 18 for Figure 17 Sectional view along the CC direction.

[0032] Figure 19 A side view of the fastener and limiting block according to another embodiment.

[0033] Figure 20 An axial view of the fastener and limiting block according to another embodiment.

[0034] Figure 21 This is a schematic diagram of a structure in which the fixing member and the limiting block are installed in the mounting cavity according to another embodiment.

[0035] Figure 22 This is a schematic diagram of the foot support mechanism in different adjustment positions according to another embodiment.

[0036] Figure 23 This is a schematic diagram showing the foot support mechanism installed in the seat during use. Detailed Implementation

[0037] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0038] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0039] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "installation", "arrangement", "have", "connect", "connect" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] If the embodiment of the utility model involves "first" or "second" or the like description, the "first" or "second" or the like description is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features.Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one feature.In the description of the utility model, if the meaning of several is more than one, the meaning of multiple is more than two, above, below, within and the like are understood to include the number.In addition, the technical features of each embodiment can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the embodiments are described, however, as long as the combination of these technical features does not exist contradictory, should be considered as the scope recorded in this specification.

[0041] Embodiment one, such as Figures 1-14The utility model discloses a kind of foot support mechanisms, including slidingly arranged in the connecting frame 1 of cushion bottom and the footrest body 2 of reversible connection on connecting frame, the footrest body 2 is equipped with installation cavity 201, connecting frame 1 is equipped with connecting rod 101 passing through installation cavity 201, the part of connecting rod 101 in installation cavity is equipped with fixed part 7, the installation cavity 201 is equipped with the limiting block 4 that can rotate synchronously with footrest body around connecting rod by elastic member 3, the side of limiting block 4 towards fixed part is equipped with catch 401, catch 401 can be one or more than two;The side of fixed part 7 relative to catch is equipped with ratchet 701 with catch meshing clamping, ratchet 701 is generally two or more, the end of fixed part is further equipped with the guide groove 702 extending along the circumference of connecting rod, the top block 5 of being installed with limiting block and can slide in guide groove is installed in guide groove, the position of limiting block 4 relative to guide groove is equipped with locating groove 402, the side of limiting block in locating groove is further equipped with the accommodation groove 403 for accommodating top block and depth is slightly deeper than locating groove, when top block slides from accommodation groove into locating groove, limiting block is away from fixed part and keeps the state of compressing elastic member, so that catch is separated from ratchet.The foot support mechanism described, through the meshing of the catch of limiting block and the ratchet on connecting rod, realizes the one-way locking of footrest device in opening direction, when footrest body rotates to opening direction, top block is in accommodation groove, the meshing clamping of catch and ratchet can effectively prevent reverse rotation of footrest body, can fix footrest body at any rotation angle, fix footrest body at different opening angles, to adapt to the support demand of different users to foot and / or leg;When footrest body continues to rotate to bottom, top block slides into locating groove from accommodation groove of limiting block under the limiting effect of guide groove, limiting block is away from fixed part, so that catch is separated from ratchet and keeps, to realize automatic unlocking, so that user can easily reset footrest body when not needing to put foot, improve the convenience of operation;When needing to fold footrest body, just need to rotate to opposite direction, until top block slides out from locating groove and is placed in accommodation groove again under the limiting effect of guide groove, limiting block resets under the action of elastic member, can make catch reengages with ratchet, restores locking state, so that footrest body is fixed in folded storage state.The utility model realizes locking and unlocking through simple mechanical structure, and user can complete the unfolding use and reset storage of footrest without additional operation, and can be fixed at multiple different heights or angles, meet the different support demand of user to foot and / or leg, improve user experience.

[0042] It can be understood that, in some other embodiments, a plurality of ratchets can be continuously arranged along the path of footrest body rotating to storage state, until the catch of limiting block reaches storage position, without transition surface in the middle, so that the whole process of footrest body from storage folding to unfolding can be locked at a specific angle;And in the embodiment, as Figure 5, only one limit ratchet 704 is arranged at the position where the limit block catches in the storage state. Before the limit block rotates from the storage state to the lowest ratchet catch, no ratchet is arranged on its path, but a smooth transition surface, and only after rotating to the lowest ratchet catch, a plurality of ratchets are arranged. In this way, the pedal body has only one locking position in the folded storage state for folding and storage, and can be locked in a plurality of locking positions only after the pedal body is rotated to a certain unfolded angle to provide a plurality of different support angles, which can effectively avoid the problem of continuous sound caused by frequent passing through the ratchet during the opening process of the pedal body.

[0043] As shown in Figure 9 , the foot support mechanism, when the pedal body is in the folded storage state 9A, the top block is located in the installation groove of the limit block, at this time the catch of the limit block is in contact with the outer side wall of the fixed part under the action of the elastic element, and the outer side wall of the fixed part is provided with a ratchet, the ratchet is engaged with the catch of the limit block, which is used to firmly fix the pedal body in the storage state; when the pedal body is counterclockwise rotated to the open state 9B, the pedal body drives the limit block and the top block to rotate synchronously around the fixed part, the top block moves in the guide groove, and the catch of the limit block is unidirectionally engaged with the ratchet of the fixed part under the action of the elastic element, so that the pedal is fixed at a suitable opening angle; when the pedal body continues to rotate counterclockwise to the highest state 9C, the top block abuts against the upper side wall of the guide groove, and the catch of the limit block is engaged in the highest ratchet of the fixed part; when the pedal body is further counterclockwise rotated to the reset state 9D, the top block cannot continue to move due to the limitation of the upper side wall of the guide groove, and the limit block rotates with the pedal body, at this time the top block enters the positioning groove from the installation groove of the limit block, and since the depth of the installation groove is greater than that of the positioning groove, the top block will move the limit block away from the top, so that the catch of the limit block is separated from the ratchet of the fixed part, and the pedal body can be rotated clockwise without resistance to reset to the state 9E, until the top block is limited by the lower side wall of the guide groove and cannot move, and the limit block continues to move with the pedal body, at this time the top block moves from the positioning groove of the limit block into the installation groove, and since the depth of the positioning groove is less than that of the installation groove, the limit block is rebounded by the elastic element, so that the catch of the limit block is in contact with the side wall of the fixed part again, and returns to the folded storage state 9A for a new round of rotation and engagement cycle.

[0044] It can be understood that by setting different numbers and densities of ratchets or catches, the pedal body can be fixed at more or less angles or have different adjustment positions. In addition, the pedal body can be fixed at a horizontal opening angle of 180 degrees, or at an inclined opening angle less than 180 degrees or an inverted inclined opening angle greater than 180 degrees, to meet the different support angle requirements of users with different sitting postures or heights for the feet and legs. In the first embodiment, the catch 401 is one, as shown in Figure 12The ratchet 401 can also be two or more in some embodiments, as shown in Figure 13 When the ratchet 401 is increased to multiple, the ratchet force of the ratchet and pawl is enhanced, thereby increasing the support force of the pedal.

[0045] As shown in Figure 2 , Figure 3 , Figure 15 and Figure 16 The fixing member 7 includes two detachable half-cylindrical structures, the connecting rod is provided with a through hole 102, and the two half-cylindrical structures are each provided with a fixing column 703 that can pass through the connecting rod. Only by passing the fixing column through the through hole 102 on the connecting rod, and by screwing the screw into the fixing column of one of the half-cylindrical structures and screwing the screw into the corresponding fixing column of the other half-cylindrical structure, the two half-cylindrical structures can be tightly fixed on the connecting rod, realizing the convenience of assembly. Compared with the structure without the fixing column inserted into the connecting rod, the problem of difficulty in finding the fixing column for screwing or fixing during the installation process after the screw passes through the through hole of the connecting rod is avoided. Of course, in some other embodiments, only one of the half-cylindrical structures can be provided with a fixing column 703 that penetrates or partially penetrates the connecting rod, and the other half-cylindrical structure can be provided with a screw hole that matches the fixing column, for the screw to pass through and be screwed with the fixing column for fixation, realizing the fixation of the two half-cylindrical structures on the connecting rod. The screw can be a self-tapping screw or a screw, and can also be a stud, a nut, etc. In addition, in some other embodiments, the fixing member can also be integrally formed on the connecting rod and protrude from the side wall of the middle part of the connecting rod, as shown in Figure 10 and Figure 11 .

[0046] As shown in Figure 3 , Figure 4 The accommodation cavity is composed of a chamber on the pedal body and a detachable lower cover 202, and the lower cover is used for sealing the chamber. The lower cover can be installed on the chamber of the pedal body in a screw-fixed or buckle-fixed manner, so as to facilitate the assembly of the limiting block, the elastic member, the top block, the connecting frame and the fixing member in the accommodation cavity.

[0047] As shown in Figures 2-4 , Figure 10 and Figure 11 The guide groove is located at both ends of the outer side wall of the fixing member, the extension direction of the guide groove is consistent with the circumferential track of the pedal body rotating around the connecting rod, the pawl is located on the outer side wall of the fixing member between the two guide grooves, and the limiting block is installed on one side of the outer side wall of the fixing member. The side of the limiting block facing the pawl is provided with a ratchet that engages and clamps with the pawl. Further, the side of the limiting block facing the pawl is provided with an arc that matches the outer side wall of the fixing member, as shown in Figure 5 , 12 , Figure 13, so as to better fit the ratchet to improve the clamping force, and make the rotation more smooth.

[0048] The sliding length of the guide groove is greater than the distribution length of the ratchet, as shown in Figure 10 and Figure 11 . It can ensure that the top block has enough sliding stroke in the guide groove, and the movement range of the top block will not be limited due to the short guide groove. In the unlocking and resetting process, the top block provides more sliding space, avoiding the problem that the top block cannot lift the limiting block to separate the clamping teeth from the ratchet due to insufficient sliding stroke.

[0049] The side of the top block 5 facing the connecting rod is provided with an arc-shaped contact surface 502 matched with the outer arc surface of the connecting rod, so as to ensure that the top block is tightly fitted with the outer surface of the connecting rod, as shown in Figure 14 . It can ensure that the top block always maintains stable contact with the connecting rod when sliding in the guide groove, which helps the top block to maintain accurate movement trajectory during sliding, ensuring that the engagement and disengagement of the clamping teeth and the ratchet are more accurate and reliable.

[0050] The side wall between the accommodation groove and the positioning groove is connected by an arc-shaped slope 6, so that the top block can smoothly slide between the accommodation groove and the positioning groove along the arc-shaped slope, as shown in Figure 12 , Figure 13 , Figure 19 and Figure 20 . The arc-shaped slope provides a smooth transition path for the sliding of the top block, avoiding the jamming or abrupt movement of the top block when sliding into or out of the positioning groove, which can significantly reduce the friction and impact during sliding, so that the top block can accurately slide into the positioning groove, thereby ensuring the stability of the top block when the elastic block is lifted, ensuring the reliable separation of the clamping teeth and the ratchet, and avoiding the problem of locking or unlocking failure caused by the unsmooth sliding of the top block.

[0051] The bottom of the positioning groove 402 extends downward to form a groove 404, and the top block 5 is provided with a protrusion 501 matched with the groove, so that the protrusion of the top block is embedded in the groove of the positioning groove, as shown in Figure 12 , Figure 13 , Figure 19 and Figure 20 . By embedding the protrusion of the top block into the groove of the positioning groove, a nested locking structure is formed, which ensures that the elastic block can be firmly lifted and kept stable after the top block slides into the positioning groove, helping to prevent the elastic block from loosening accidentally due to external force or vibration during unlocking, thereby improving the reliability and stability.

[0052] The elastic member can be a spring, or also can be an elastic sheet, a leaf spring, elastic rubber or any other element with elastic function, which is not limited here. Further, as shown in Figure 4As shown, the limiting block or mounting cavity can be provided with a recess or protruding column 405, and the elastic member is fixed through the recess or protruding column.

[0053] The main difference between the embodiment two and the embodiment one is that the guide groove 702 is located at the two ends of the inner wall of the fixing member, the extension direction of the guide groove is consistent with the circumferential track of the pedal body rotating around the connecting rod, the ratchet is arranged at the edge of the two ends of the fixing member, the limiting block 4 is in the shape of a semi-circular ring and is mounted at one side of the end of the fixing member, the side of the limiting block 4 facing the ratchet is provided with the clamping tooth 401 engaged with the ratchet, and the limiting block 4 is mounted at the two sides of the mounting cavity through the elastic member 3 and can rotate synchronously with the pedal body. The top block 5 is arranged in the guide groove 702 and is connected with the limiting block and can slide in the guide groove. The positioning groove 402 is arranged at the position opposite to the guide groove of the limiting block 4, and the accommodation groove 403 is further arranged at one side of the positioning groove 402 and is used for accommodating the top block. The depth of the accommodation groove is slightly deeper than that of the positioning groove. When the top block is in the accommodation groove, the ratchet and the clamping tooth are engaged and clamped. When the top block slides from the accommodation groove into the positioning groove, the limiting block moves away from the fixing member and keeps the elastic member in the compressed state, so that the clamping tooth is separated from the ratchet.

[0054] As Figure 22 shown, in the cooperation of the pedal body and the connecting frame, when the pedal body is in the folded storage state, the top block is located in the accommodation groove of the limiting block. Under the action of the elastic member, the clamping tooth of the limiting block is engaged and clamped with the ratchet of the fixing member, and one-way locking is realized. The pedal body continues to rotate counterclockwise, the pedal body drives the limiting block and the top block to rotate synchronously, the top block moves in the guide groove, and the clamping tooth of the limiting block is one-way engaged and clamped with the ratchet of the fixing member under the action of the elastic member, so that the pedal body is fixed at different suitable opening angles. If the pedal body continues to rotate counterclockwise, until the length of the guide groove is limited, the top block cannot continue to move due to the limitation of the guide groove, and the limiting block continues to rotate around the fixing member with the pedal body. At this time, the top block enters the positioning groove from the accommodation groove of the limiting block. Since the depth of the accommodation groove is greater than that of the positioning groove, the top block will push the limiting block away, so that the limiting block is separated from the ratchet of the fixing member, and the pedal body can rotate clockwise without resistance. In the resetting process, the top block cannot move again due to the limitation of the guide groove, the limiting block continues to rotate around the fixing member with the pedal body, and the top block moves back to the accommodation groove from the positioning groove. Since the depth of the positioning groove is less than that of the accommodation groove, the clamping tooth of the limiting block is re-engaged with the ratchet of the fixing member under the rebound action of the elastic member, and a new cycle of locking and rotating is completed.

[0055] It can be understood that the footrest can also be fixed at more or less angles or have different adjustment gears by setting different numbers and densities of the ratchet teeth or the pawls. In the second embodiment, the number of the pawls is multiple, thereby increasing the friction between the ratchet teeth and the pawls and increasing the supporting force of the footrest, compared with the case where the number of the pawls is only one, which is more stable. In addition, in some other embodiments, the limiting block can also be designed as a circular ring, and the limiting block can be synchronously rotated with the footrest body by setting a clamping installation structure between the limiting block and the installation cavity.

[0056] Obviously, other structures of the second embodiment can be processed by referring to the relevant connection structures of the first embodiment, such as the connection structures of the semi-cylindrical shape and the connecting rod, the setting of the accommodating cavity or the setting of the arc-shaped slope.

[0057] In addition to the implementation manners of the above embodiments, the foot support mechanism can also adopt other appropriate structures.

[0058] In some embodiments, the friction between the ratchet teeth and the pawls can be increased by increasing the engagement area of the ratchet teeth and the pawls, or by separately or mutually setting friction stripes or sanding surfaces on the surfaces of the ratchet teeth or the pawls, or by covering a rubber layer, or by other anti-skid structures capable of increasing the friction, so as to increase the supporting force of the footrest. In addition, in some embodiments, the footrest can be covered with lubricating oil or lubricating grease or other lubricants, so that the rotation is smoother and the sound during rotation is reduced. In addition, in some embodiments, the fixing member can be installed on one side of the footrest body to rotate with the footrest body, and the limiting member is connected to the connecting rod by a spring, as an alternative structure.

[0059] Some chairs using the foot support device and some specific operation and use mode examples are listed here. The chair seat is provided with a sliding groove, and the foot support device is movably connected in the sliding groove, or as shown in Figure 23 , the support frame seat 9 is detachably connected or integrally connected below the chair seat 8, and the connecting frame movably penetrates through the support frame seat. When it is needed to be used, the footrest is pulled out and fixed at different angles, for example Figure 23 b, Figure 23 c, so as to meet different supporting requirements of the feet and / or legs. When it is not needed to be used, the footrest is rotated to the highest point, for example Figure 23 d, and then continues to rotate until it is folded and returned to the bottom of the chair for storage, for example Figure 23 a.

[0060] The above merely describes preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application. In the description of the present application, the description of the reference terms "one embodiment", "some embodiments", "embodiment", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments, and the embodiments of the present application and the features in the embodiments can be combined.

Claims

1. A foot support mechanism comprising a connecting frame (1) slidably arranged under a seat cushion and a footrest body (2) reversibly connected to the connecting frame, characterized in that, The pedal body (2) is provided with a mounting cavity (201), the connecting frame (1) is provided with a connecting rod (101) penetrating through the mounting cavity (201), the part of the connecting rod (101) in the mounting cavity is provided with a fixing member (7), a limiting block (4) capable of rotating synchronously with the pedal body around the connecting rod is mounted in the mounting cavity (201) through an elastic member (3), the side of the limiting block (4) facing the fixing member is provided with a clamping tooth (401); the side of the fixing member (7) opposite to the clamping tooth is provided with a ratchet (701) engaged with the clamping tooth, the end of the fixing member is further provided with a guide groove (702) extending along the circumference of the connecting rod, the guide groove is provided with a top block (5) capable of sliding in the guide groove and abutting against the limiting block, the position of the limiting block (4) opposite to the guide groove is provided with a positioning groove (402), the side of the limiting block in the positioning groove is further provided with a placement groove (403) capable of accommodating the top block and having a depth slightly deeper than that of the positioning groove, when the top block slides from the placement groove into the positioning groove, the limiting block is away from the fixing member and keeps the state of compressing the elastic member, so that the clamping tooth is separated from the ratchet.

2. The foot support mechanism of claim 1, wherein, The fixing member (7) comprises two detachable semi-cylindrical structures, the semi-cylindrical structures are provided with fixing columns (703) penetrating through the connecting rod, and the fixing columns are screwed to firmly assemble with the connecting rod.

3. The foot support mechanism of claim 1, wherein, The guide grooves are located at the two ends of the outer side wall of the fixing member, the extension direction of the guide grooves is consistent with the circumferential track of the pedal body rotating around the connecting rod, the ratchet is located on the outer side wall of the fixing member between the two guide grooves, the limiting block is mounted on one side of the outer side wall of the fixing member, and the side of the limiting block facing the ratchet is provided with the clamping tooth engaged with the ratchet.

4. The foot support mechanism of claim 3, wherein, The sliding length of the guide groove is greater than the distribution length of the ratchet.

5. The foot support mechanism of claim 3, wherein, The side of the top block (5) facing the fixing member is provided with an arc-shaped contact surface (502) matched with the outer arc surface of the fixing member, so as to ensure that the top block is closely attached to the outer surface of the connecting rod.

6. The foot support mechanism of claim 1, wherein, The guide grooves are located at the two ends of the inner side wall of the fixing member, the extension direction of the guide grooves is consistent with the circumferential track of the pedal body rotating around the connecting rod, the ratchet is arranged at the edges of the two ends of the fixing member, the limiting block is in a semi-circular ring shape and is mounted on one side of the end of the fixing member, and the side of the limiting block facing the ratchet is provided with the clamping tooth engaged with the ratchet.

7. The foot support mechanism of claim 1, wherein, The side walls between the placement groove and the positioning groove are connected through an arc-shaped slope (6) to smoothly transition, so that the top block can smoothly slide between the placement groove and the positioning groove along the arc-shaped slope.

8. The foot support mechanism of claim 1, wherein, The bottom of the positioning groove (402) extends downward to form a groove (404), and the top block (5) is provided with a protrusion (501) matched with the groove, so that the protrusion of the top block is embedded in the groove of the positioning groove.

9. The foot support mechanism of claim 1, wherein, The elastic member is a spring.

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