A two-sided locking system for footrest adjustment of a seat and a seat

Abstract

The application discloses a double-side locking system for footrest adjustment of a seat and the seat, which comprises a footrest assembly, a rotating support body and a double-side locking assembly; the double-side locking assembly comprises a guide rod and a rotating shaft seat; a clamping limiting mechanism is arranged between a limiting clamping ring of a rear connecting seat and the rotating shaft seat, the clamping limiting mechanism comprises a clamping head arranged on a shaft body and a clamping groove arranged on the limiting clamping ring; the footrest assembly has an unlocking state in which the clamping head and the clamping groove are staggered left and right; an adjusting button is extruded to move the rotating shaft seat; in a single-side adjusting mode, an adjusting button on any one side is extruded inward to make the clamping head inwardly separate from the limiting clamping ring; the double-side locking assembly is offset in the rotating support body in the direction of the thrust force, and the rotating shaft seat on the other side is correspondingly outwardly protruded to make the clamping head outwardly separate from the limiting protruding ring; in a double-side adjusting mode, the adjusting buttons on the two sides are simultaneously pressed to move inward, and the rotating shaft seats on the two sides are respectively moved inward along the guide rod to make the clamping heads on each side inwardly separate from the limiting clamping ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of seating furniture, in particular to a double-sided locking system for adjusting the footrest of a seating furniture and a seating furniture. BACKGROUND

[0002] Leisure chairs are one of the essential furniture in the home. People spend most of their time sitting on the chair during the long rest and relaxation time. Long time sitting can easily lead to physical fatigue. The most direct solution to fatigue is to rest while working. The posture of working while resting can cause certain damage to the cervical and lumbar spine. Long-term use will seriously affect the human body. Therefore, lying on a leisure chair to rest has become the first choice for people. However, when lying on a leisure chair, people do not have a suitable place to put their feet, making people not very comfortable when lying on the chair. Therefore, more and more seats are designed with a seat footrest at the bottom. The seat footrest can stretch the legs flat to promote blood circulation. There are two structures of seats with footrests on the market: one is to set a pull-out type footrest plate, which can be pulled forward and backward to use or hide; the other is to set a flip type footrest plate, which can be flipped to have two use states of being flipped open for use or being folded at the bottom of the seat.

[0003] Specifically: for the flip type footrest structure, a locking or unlocking mechanism is usually additionally provided to realize the flip locking and unlocking of the footrest. The locking mechanism and the switch need to be set inside the footrest. During the flipping process, multiple components are also flipped synchronously. The components are numerous and the structure is complex. Such design undoubtedly increases the design cost. Secondly, the existing footrest adjustment switch is specifically set at a position of the footrest and exposed outside the footrest. When the footrest needs to be locked or unlocked, only the adjustment switch can be controlled. The adjustment mode is very single. If the adjustment switch is set on one side of the footrest, the user can only stretch his hand to that side to adjust every time. The adjustment mode is single. However, the user's action of sitting on the chair is very casual and will occasionally lean to one side of the chair. Therefore, if the adjustment of the footrest is fixed on a single side, it is limited.

[0004] Then, if a footrest adjustment structure can be designed to enable the user to adjust the footrest on either side, multiple adjustment modes can be provided, which will undoubtedly make the use more humanized. SUMMARY

[0005] The purpose of the present application is to overcome the deficiencies in the prior art, provide a two-side locking system for footrest adjustment of a seat; by providing a two-side locking assembly in the footrest assembly and the rotating support body, there are adjustment buttons on both sides of the footrest; so that when the footrest assembly needs to be adjusted from the locked state to the unlocked state, there are single-side adjustment mode and double-side adjustment mode; the user can press the adjustment button on either side; or press the adjustment buttons on both sides at the same time; so that the adjustment mode is very diverse, the user can choose at will, and the use will be more humanized.

[0006] Further, a seat containing the above two-side locking system is provided.

[0007] The technical solution of the present application is as follows:

[0008] A two-side locking system for footrest adjustment of a seat, comprising: a footrest assembly and a rotating support body; the rotating support body is transversely arranged at the rear end of the footrest assembly; a two-side locking assembly is arranged in the rotating support body; the two-side locking assembly comprises a guide rod arranged horizontally in the rotating support body and a rotating shaft seat arranged symmetrically on the left and right sides of the guide rod; the rotating shaft seat comprises a shaft body exposed outside the rotating support body and a guide seat slidingly fitted in the rotating support body; the rear end of the footrest assembly is provided with a rear connecting seat rotatingly fitted on the shaft seat on both sides; a clamping limiting mechanism is arranged between the shaft body and the rear connecting seat; the rear connecting seat is provided with a limiting snap ring rotatingly sleeved on the shaft body; the clamping limiting mechanism comprises a clamping head arranged on the shaft body and protruding outward, and a clamping groove arranged on the limiting snap ring; the footrest assembly has a locked state of clamping the clamping head and the clamping groove, and an unlocked state of the clamping head and the clamping groove being staggered left and right; the two-side locking assembly further comprises a resilient member arranged in the rotating support body, which is configured to act on the rotating shaft seat to make the clamping head always have a tendency to be clamped with the clamping groove; an adjustment button is connected with the rotating shaft seat and exposed outside the rear connecting seat; the adjustment button is pressed to drive the rotating shaft seat to move; the rotating shaft seat is sleeved on the guide rod and has static friction therebetween; the footrest assembly has a single-side adjustment mode and a double-side adjustment mode from the locked state to the unlocked state, in the single-side adjustment mode, any one side of the adjustment button is pressed inward to drive the rotating shaft seat on the side to move inward so that the clamping head is separated from the limiting snap ring, the resilient member on the side is deformed and provides elastic force for the rotating shaft seat to reset; and the whole two-side locking assembly is offset in the rotating support body in the direction of the pushing force, the rotating shaft seat on the other side is correspondingly protruded outward so that the clamping head thereof is separated from the limiting convex ring outward; in the double-side adjustment mode, the adjustment buttons on both sides are pressed inward at the same time, the rotating shaft seats on both sides are respectively offset inward along the axial direction of the guide rod to make the clamping head on each side separated from the limiting snap ring inward.

[0009] As preferred, the overall length of the double-side locking assembly does not change in the single-side adjustment mode; the overall length of the double-side locking assembly decreases in the double-side adjustment mode. In the single-side adjustment mode, the rotating shaft seat and the guide rod do not bear the force that drives them to move relative to each other, and thus the rotating shaft seat and the guide rod move synchronously, i.e., the double-side locking assembly as a whole will be offset in the rotating support body in the direction of the thrust. In the double-side adjustment mode, the rotating shaft seat on each side bears the force that drives it to move relative to the guide rod, and thus each rotating shaft seat moves inward relative to the guide rod.

[0010] As preferred, the maximum static friction between the rotating shaft seat and the guide rod is less than the minimum actuating force that drives the elastic member to deform. When the adjustment buttons on both sides are pressed at the same time, the rotating shaft seat on each side bears the force that drives it to move relative to the guide rod, and thus each rotating shaft seat moves inward relative to the guide rod, and the elastic member deforms accordingly; the maximum static friction between the rotating shaft seat and the guide rod is less than the minimum actuating force that drives the elastic member to deform, so that the restoring force of the elastic member is sufficient to drive the rotating shaft seat to return to the locked position again.

[0011] As preferred, the rotating support body has a side joint at each end, and the side joint has a guide groove; the guide seat is slidingly inserted into the guide groove, and the guide seat is fixed circumferentially to the side joint. This allows the double-side locking assembly to move left and right in the rotating support body, so that the footrest assembly is stable during the turning adjustment.

[0012] As preferred, the middle part of the rotating support body has an internal hollow structure, and the guide rod is horizontally arranged in the rotating support body; and the two ends of the guide rod pass through the guide grooves in the side joints and are connected to the rotating shaft seats. Thus, the rotating shaft seat on each side can slide left and right along the guide groove, so that the double-side locking assembly as a whole can be offset left and right in the rotating support body.

[0013] As preferred, the inner end of the side joint has an inner convex supporting ring, and the guide rod passes through the supporting ring; and the guide rod and the supporting ring are gap-fitted. The two ends of the guide rod pass through the supporting ring, so that the guide rod can be stably offset horizontally.

[0014] As preferred, the elastic member is a spring that is sleeved on the guide rod, and the spring is located between the rotating shaft seat and the supporting ring; in the locked state of the footrest assembly, the spring is in a natural state. When the rotating shaft seat moves inward to make the clamping head disengage from the limiting clamping ring, the spring elastically deforms to provide a restoring force for the rotating shaft seat to return again.

[0015] As preferred, the end of the guide rod that passes through the rotating shaft seat is further provided with a limiting nut, which is configured to limit the rotating shaft seat from moving outward away from the guide rod.

[0016] As preferred, the rear connecting seat has a ring structure, and the limiting clamping ring is convexly arranged in the rear connecting seat; and the width of the shaft body is greater than the width of the limiting clamping ring.

[0017] As preferred, the clamping heads are arranged circumferentially and spaced apart by two; the clamping slots are arranged circumferentially and spaced apart by three, and the three clamping slots are arranged in an isosceles triangle; the footrest assembly is flipped to make the two clamping heads clamped in the two clamping slots at different positions, so that the footrest assembly has a folding position and an opening position correspondingly.

[0018] As preferred, the slot width of the clamping slot is not more than 3 cm. When the clamping head is staggered left and right with the limiting clamping ring, the rotating cooperation between the limiting clamping ring and the shaft body is not affected.

[0019] As preferred, the adjusting button is clamped on the outer side of the shaft body. The connection is convenient.

[0020] A seat includes a seat part, a pull-out footrest adjusting mechanism arranged at the lower end of the seat part, and a seat footrest adjusting double-side locking system as described above, and the double-side locking system is connected to the pull-out footrest adjusting mechanism.

[0021] As preferred, the pull-out footrest adjusting mechanism includes a pull-out rod, and the rotating support body in the double-side locking system is connected to the pull-out rod.

[0022] The design starting point, concept and beneficial effects of the seat footrest adjusting double-side locking system of the present application are as follows:

[0023] Firstly, the seat footrest adjusting double-side locking system of the present application is provided with the double-side locking assembly in the rotating support body, so that the adjusting button is arranged on both sides of the footrest assembly; the clamping head on the shaft body is clamped with the clamping slot on the limiting clamping ring to lock the footrest assembly, and the rotating shaft seat can be shifted left and right to stagger the clamping head and the limiting clamping ring left and right, so that the footrest assembly is flipped to be unlocked. Then, when the footrest assembly needs to be adjusted to the unlocked state, the single-side adjusting mode and the double-side adjusting mode are provided, and the adjusting mode is not single and limited; the user can squeeze the adjusting button on any side, either left or right, and the user can squeeze the side which is convenient for the user to squeeze; or the user can squeeze the adjusting buttons on both sides at the same time; both sides can be unlocked; the adjusting mode is diversified, and the user can adjust as convenient as possible, which is interesting and high-grade.

[0024] Secondly, the rotating shaft seat is sleeved on the guide rod and has static friction therebetween; in the single-side adjusting mode, when the rotating shaft seat and the guide rod are not subjected to the action force to drive the mutual movement therebetween, the rotating shaft seat and the guide rod keep synchronous movement, i.e. the double-side locking assembly as a whole will be shifted in the rotating support body in the direction of the pushing force. In the double-side adjusting mode, the rotating shaft seat on each side is subjected to the action force to cause the relative movement with the guide rod, so that each rotating shaft seat moves inward relative to the guide rod; in either adjusting mode, the spring can provide the elastic force to reset the rotating shaft seat, which is very ingenious.

[0025] Furthermore, the bilateral locking assembly is arranged in the horizontal direction in the rotating support body, and is composed of a guide rod and rotating shaft seats arranged on both sides of the guide rod; the overall structure is simple and compact; no space of the foot rest assembly is occupied, and is hidden in the rotating support body, and the layout is more reasonable. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat;

[0027] Figure 2 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat;

[0028] Figure 3 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat;

[0029] Figure 4 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat;

[0030] Figure 5 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat;

[0031] Figure 6 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat;

[0032] Figure 7 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat;

[0033] Figure 8 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat;

[0034] Figure 9 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat;

[0035] Figure 10 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat;

[0036] Figure 11 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat;

[0037] Figure 12 A perspective view of the foot rest assembly in the embodiment of the present application is applied to the seat; Figure 11 An enlarged view of the partial A;

[0038] Figure 13The three-dimensional structure diagram of the application is shown in the embodiment, and the adjusting buttons on both sides are pressed to unlock the foot rest assembly.

[0039] The reference signs are as follows: foot rest assembly 1, rotating support body 2, double-side locking assembly 3, guide rod 4, rotating shaft seat 5, shaft body 501, guide seat 502, rear connecting seat 6, side joint 7, supporting ring 701, guide groove 8, limiting snap ring 9, clamping head 10, clamping groove 11, spring 12, adjusting button 13, limiting nut 14, and avoiding groove 15. Embodiment

[0040] In order to enable the above-mentioned objects, features and advantages of the application to be more clearly understood, the application will be further described below with reference to the drawings and specific embodiments. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

[0041] In the following description, many specific details are set forth in order to provide a thorough understanding of the application. However, the application can be practiced in other ways different from those described herein, and therefore, the scope of the application is not limited to the specific embodiments disclosed below.

[0042] In the description of the application, the term "at least one" refers to one or more than one, unless otherwise explicitly limited. The terms "first", "second", "third", etc. are only used for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0043] The specific embodiments of the application are as follows:

[0044] As Figures 1-13 shown, the application provides a double-side locking system for adjusting a foot rest of a seat, which comprises a foot rest assembly 1, a rotating support body 2, and a double-side locking assembly 3 arranged in the rotating support body 2. The rotating support body 2 is arranged transversely at the rear end of the foot rest assembly 1. The double-side locking assembly 3 comprises a guide rod 4 arranged horizontally in the rotating support body and rotating shaft seats 5 arranged mirror symmetrically on the left and right sides of the guide rod 4. The rotating shaft seat 5 comprises a shaft body 501 exposed outside the rotating support body 2 and a guide seat 502 slidingly fitted in the rotating support body 2. The rear end of the foot rest assembly 1 is provided with rear connecting seats 6 rotatably connected to the shaft body 501 on both sides. Therefore, the foot rest assembly 1 can be adjusted by being flipped around the rotating support body 2.

[0045] As Figures 2-10As shown, the two ends of the rotating support body 2 are respectively provided with side joints 7, and the side joints 7 are provided with guide grooves 8 which are slidably connected with the guide bases 502. The middle part of the rotating support body 2 is internally hollow, the guide rods 4 are horizontally arranged in the rotating support body 2, the inner ends of the side joints 7 are provided with inner convex supporting rings 701, the two ends of the guide rods 4 are respectively arranged in the supporting rings 701, and the guide rods 4 are gap-fitted with the supporting rings 701. The supporting rings 701 are configured to limit the shaking of the guide rods 4 in the rotating support body 2, so that the guide rods 4 can be kept horizontally and stably offset. The two ends of the guide rods 4 are respectively arranged in the guide grooves 8 of the side joints 7 and connected with the rotating shaft bases 5. Then, the rotating shaft bases 5 on each side can slide left and right along the guide grooves 8, so that the bilateral locking assembly 3 as a whole can be offset left and right in the rotating support body 2. The guide bases 502 are circumferentially fixed with the side joints 7, so that the bilateral locking assembly 3 can only move left and right in the rotating support body 2, and the footrest assembly 1 is stably adjusted in the turning.

[0046] As shown in Figure 3 , 4 , 7-9, the shaft body 501 and the rear connecting base 6 are provided with a clamping limiting mechanism. The rear connecting base 6 is in a ring structure, and a ring of inner convex limiting snap rings 9 is arranged in the rear connecting base 6. The limiting snap rings 9 are rotationally sleeved on the shaft body 501, so that the rear connecting base 6 is rotationally connected with the shaft body 501. The clamping limiting mechanism includes two circumferentially spaced and outward protruding clamping heads 10 arranged on the shaft body 501, and clamping grooves 11 arranged on the limiting snap rings 9 correspondingly. The clamping grooves 11 are circumferentially spaced and arranged in three, and the three clamping grooves 11 are arranged in an isosceles triangle shape. Specifically, as shown in Figure 8 , 9 , when the footrest assembly 1 is turned to make the two clamping heads 10 clamped in two different clamping grooves 11, the footrest assembly 1 has a corresponding folding position and an opening position which can keep a stable state. Secondly, since the rotating shaft bases 5 on each side can move left and right along the guide grooves 8, and the width of the shaft body 501 is greater than the width of the limiting snap rings 9, that is, when the rotating shaft bases 5 are offset, the clamping heads 10 can be left and right staggered with the limiting snap rings 9. Then, the footrest assembly 1 has a locking state in which the clamping heads 10 are clamped with the clamping grooves 11, and an unlocking state in which the clamping heads 10 are left and right staggered with the clamping grooves 11. In the locking state, the footrest assembly 1 is turned and locked. In the unlocking state, the footrest assembly 1 can be turned and adjusted around the shaft body 501. In addition, the slot width of the clamping grooves 11 is not more than 3 cm. When the clamping heads 10 are left and right staggered with the limiting snap rings 9, the rotation connection between the limiting snap rings 9 and the shaft body 501 is not affected.

[0047] Furthermore, as shown in Figure 5 , 10As shown, the double-side locking assembly 3 further comprises elastic members arranged in the depth of each side guide groove 8, which are springs 12 sleeved on the guide rod 4 and acting on the rotating shaft seat 5, and the springs 12 are located between the rotating shaft seat 5 and the bearing ring 701; the springs 12 are configured to act on the rotating shaft seat 5 to make the clamping head 10 always have the tendency to be clamped with the clamping groove 11; that is, as shown in Figure 10 As shown, in the locked state, the spring 12 is in a natural state. Then when the rotating shaft seat 5 moves inward to make the clamping head 10 inwardly disengage from the limiting clamping ring 9, the spring 12 will be elastically deformed to provide elastic force for the repositioning of the rotating shaft seat 5.

[0048] As shown in Figures 3-5 4-12, an adjusting button 13 is further connected to the outer side of the rotating shaft seat 5 on each side, the adjusting button 13 is clamped on the outer side of the shaft body 501 and exposed outside the rear connecting seat 5, and the rotating shaft seat 5 can be driven to move inward by inwardly pressing the adjusting button 13. The key point is that, as shown in Figure 10 As shown, in the locked state of the footrest assembly 1, the clamping head 10 on the rotating shaft seat 5 on both sides is clamped in the clamping groove 11 of the limiting clamping ring 9, and the spring 12 is in a natural state; by controlling the double-side locking assembly 3, when the footrest assembly 1 is adjusted from the locked state to the unlocked state, there are two modes of adjustment; in particular, one of the adjustment modes is a single-side adjustment mode: as shown in Figures 10-12 As shown, the user can press the adjusting button 13 on any one side to drive the rotating shaft seat 5 on the side to move inward to make the clamping head 10 inwardly disengage from the limiting clamping ring 9, and the spring 12 on the side is correspondingly compressed and deformed to provide elastic force for the repositioning of the rotating shaft seat 5. In addition, the rotating shaft seat 5 is sleeved on the guide rod 4 and has static friction therebetween, that is, when the rotating shaft seat 5 and the guide rod 4 are not subjected to an acting force to drive them to move relative to each other, the rotating shaft seat 5 can keep synchronous movement with the guide rod 4; therefore, when only the adjusting button 13 on one side is pressed, the rotating shaft seat 5 keeps synchronous movement with the guide rod 4; that is, the double-side locking assembly 3 as a whole will be offset in the thrust direction in the rotating support body 2, as shown in Figure 12 As shown, the rotating shaft seat 5 on the other side will be correspondingly protruded to make the clamping head 10 outwardly disengage from the limiting clamping ring 9; then when the clamping head 10 on the rotating shaft seat 5 on both sides is staggered left and right with the limiting clamping ring 9, the footrest assembly 1 is in the unlocked state, and then the footrest assembly 1 can be rotated around the rotating support body 2; in this process, the overall length of the double-side locking assembly 3 will not change. And under the repositioning elastic force of the spring 12 on the side subjected to the pressing force, when the footrest assembly 1 is rotated to the position where the clamping head 10 can be clamped into the clamping groove 11 again, the rotating shaft seat 5 can be automatically repositioned to make the footrest assembly 1 locked again, so that the adjustment is very convenient. Therefore, by using the single-side adjustment mode, the user can press the adjusting button 13 on any one side at will to make the footrest assembly 1 adjusted to the unlocked state; the adjustment position is not limited.

[0049] As shown in Figure 10 、 13 Another adjustment mode is the bilateral adjustment mode: the user can also squeeze the two adjustment buttons 13 with both hands at the same time to move the two rotating shaft seats 5 inward; specifically, the rotating shaft seat 5 on each side is subjected to the action force of relative movement of the guide rod 4, so that the rotating shaft seat 5 on each side moves inward relative to the guide rod 4, and the guide rod 4 does not deviate in the rotating support body 2; that is, the rotating shaft seat 5 on each side will move inward so that the clamping head 10 disengages from the limiting clamping ring 9 inward; during this process, the length of the bilateral locking assembly 3 as a whole will be shortened, and the spring 12 on each side is in a squeezed state; so that the footrest assembly 3 can also be in an unlocked state. After that, when the user releases the two adjustment buttons 13 at the same time, the spring 12 on each side will squeeze the rotating shaft seat 5 on the corresponding side relative to the guide rod 4 to reset the clamping head 10 to be able to be clamped into the clamping groove 11 again; and the maximum static friction between the rotating shaft seat 5 and the guide rod 4 is less than the minimum actuation force that drives the spring 12 to deform, so that the spring force of the spring 12 is sufficient to drive the rotating shaft seat 5 to reset to the locked position again.

[0050] Moreover, the end of the guide rod 4 passing through the rotating shaft seat 502 is also provided with a limiting nut 14, which can limit the rotating shaft seat 5 from disengaging outwardly from the guide rod 4; and the shaft body 501 is provided with a avoiding groove 15 for avoiding the movement of the limiting nut 14. The diameter of the shaft body 501 is larger than the opening size of the guide groove 8, so that the bilateral locking assembly 3 can stably adjust the movement in the rotating support body 2.

[0051] Further, a seat is provided, as shown in Figure 1 、 2 The seat comprises a seat part, a pull-out type footrest adjustment mechanism arranged at the lower end of the seat part, and a bilateral locking system for adjusting the footrest of the seat as described above, and the bilateral locking system is connected to the pull-out type footrest adjustment mechanism. Specifically, the pull-out type footrest adjustment mechanism comprises two pull-out rods arranged at intervals, and the rotating support body in the bilateral locking system has two joints, each joint being connected to one pull-out rod and being capable of being pulled out with the pull-out rod.

[0052] In summary, the double-side locking system for adjusting the ottoman and footrest, by the double-side locking assembly 3, makes both sides of the footrest assembly 1 have the adjusting button 13, so that the adjusting mode is not single limited; when the footrest assembly 1 needs to be adjusted, the user can squeeze the adjusting button 13 on any side, either left or right, and the user can squeeze the side which is convenient for the user; or the user can squeeze the adjusting button 13 on both sides at the same time; all can unlock the footrest assembly 1; the adjusting mode is diversified, and the user can adjust as convenient as possible, which is interesting and high-grade; and the double-side locking assembly 3 is arranged in the horizontal direction in the rotating support body 2, and the overall structure is simple and small; the space of the footrest assembly 1 is not occupied, and the layout is more reasonable.

[0053] The above description of the present application and its embodiments is illustrative, and is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it, without departing from the purpose of the present application, similar structure modes and embodiments can be designed without creativity, which should belong to the protection scope of the present application.

Claims

1. A double-sided locking system for adjusting the footrest of a seat, characterized in that, include: Foot support assembly and swivel support; The rotating support body is laterally positioned at the rear end of the foot support assembly; A double-sided locking assembly is disposed within a rotating support body. The double-sided locking assembly includes a guide rod horizontally disposed within the rotating support body and rotating shaft seats mirror-disposed on the left and right sides of the guide rod. The rotating shaft seats include a shaft protruding from the rotating support body and a guide seat slidably fitted within the rotating support body. Rear connecting seats slidably fitted on the shaft seats are provided on both sides of the rear end of the foot rest assembly. A locking and limiting mechanism is provided between the shaft and the rear connecting seat; the rear connecting seat is provided with a limiting ring that is rotatably sleeved on the shaft; the locking and limiting mechanism includes a locking head that is provided on the shaft and protrudes outward, and a corresponding locking groove that is provided on the limiting ring; the foot assembly has a locked state in which the locking head and the locking groove are engaged, and an unlocked state in which the locking head and the locking groove are staggered to the left and right; the double-sided locking assembly also includes an elastic element provided in the rotating support body, which is configured to act on the rotating shaft seat so that its locking head always tends to engage with the locking groove; The adjustment button is connected to the rotating shaft seat and protrudes from the rear connecting seat; Press the adjustment button to drive the rotating shaft seat to move; The rotating shaft seat is sleeved on the guide rod, and there is static friction between the two; The foot rest assembly has a single-sided adjustment mode and a double-sided adjustment mode for adjusting from a locked state to an unlocked state. In the single-sided adjustment mode, pressing the adjustment button on either side inward moves the rotating shaft seat on that side inward, causing the locking head to disengage from the limiting ring. The elastic element on that side deforms and provides a spring force for the rotating shaft seat to reset. The double-sided locking assembly shifts inward in the direction of thrust within the rotating support body, and the rotating shaft seat on the other side protrudes outward accordingly, causing its locking head to disengage from the limiting ring. The overall length of the double-sided locking assembly remains unchanged. In the double-sided adjustment mode, pressing the adjustment buttons on both sides simultaneously moves them inward, causing the rotating shaft seats on both sides to shift inward along the axial direction of the guide rod, causing the locking heads on each side to disengage from the limiting ring. The overall length of the double-sided locking assembly decreases.

2. The double-sided locking system for adjusting the footrest of a seat according to claim 1, characterized in that: The maximum static friction between the rotating shaft seat and the guide rod is less than the minimum actuating force required to deform the elastic element.

3. The double-sided locking system for adjusting the footrest of a seat according to claim 1, characterized in that: The rotating support body has side joints at both ends, and the side joints are provided with guide grooves; the guide seat is slidably inserted into the guide grooves, and the guide seat and the side joints are circumferentially fixed.

4. The double-sided locking system for adjusting the footrest of a seat according to claim 3, characterized in that: The middle part of the rotating support body is a hollow structure, and the guide rod is horizontally arranged inside the rotating support body; and the two ends of the guide rod respectively pass through the guide groove of the side joint and are connected to the rotating shaft seat.

5. The double-sided locking system for adjusting the footrest of a seat according to claim 4, characterized in that: The inner end of the side connector has an inwardly protruding support ring, and the guide rod passes through the support ring; and the guide rod and the support ring are in clearance fit.

6. The double-sided locking system for adjusting the footrest of a seat according to claim 5, characterized in that: The elastic element is a spring sleeved on the guide rod, and the spring is located between the rotating shaft seat and the support ring; when the foot rest assembly is in the locked state, the spring is in the natural state.

7. The double-sided locking system for adjusting the footrest of a seat according to claim 4, characterized in that: The guide rod, which passes through the end of the rotating shaft seat, is also provided with a limiting nut, which is configured to prevent the rotating shaft seat from disengaging from the guide rod.

8. The double-sided locking system for adjusting the footrest of a seat according to claim 7, characterized in that: The shaft body is provided with a clearance groove for the movement of the clearance limit nut.

9. The double-sided locking system for adjusting the footrest of a seat according to claim 1, characterized in that: The rear connector has a ring-shaped structure, and a retaining ring protrudes from the rear connector; and the width of the shaft is greater than the width of the retaining ring.

10. The double-sided locking system for adjusting the footrest of a seat according to claim 1, characterized in that: The card heads are configured as two circumferentially spaced apart; the card slots are configured as three circumferentially spaced apart, and the three card slots are distributed in an isosceles triangle; the foot rest assembly flips so that the two card heads are engaged in the two card slots at different positions, so that the foot rest assembly has a folded position and an open position respectively.

11. The double-sided locking system for adjusting the footrest of a seat according to claim 10, characterized in that: The maximum width of the slot is no more than 3cm.

12. The double-sided locking system for adjusting the footrest of a seat according to claim 1, characterized in that: The adjustment button is snapped onto the outer end of the shaft.

13. A type of seating, characterized by: The seat includes a seat portion, a pull-out footrest adjustment mechanism disposed at the lower end of the seat portion, and a double-sided locking system for adjusting the footrest as described in any one of claims 1-12, wherein the double-sided locking system is connected to the pull-out footrest adjustment mechanism.

14. The seating according to claim 13, characterized in that: The pull-out footrest adjustment mechanism includes a pull-out rod, and a rotating support in the double-sided locking system is connected to the pull-out rod.

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