Foot rest overturning and fixing mechanism and swivel chair

Abstract

The utility model belongs to the technical field of seat manufacturing, and particularly relates to a footrest overturning and fixing mechanism and a swivel chair, the footrest overturning and fixing mechanism comprises an overturning fixing joint and a footrest frame rotatably connected to the overturning fixing joint, one end of the overturning fixing joint is provided with a rotating shaft hole, the footrest frame is provided with a rotating shaft rotatably inserted in the rotating shaft hole, and the rotating shaft is provided with a rotating shaft. A sliding rail communicated with the rotating shaft hole is formed in the overturning fixing joint, a fixing pin is arranged in the sliding rail in a sliding mode, and the fixing pin is matched with a fixing structure arranged on the rotating shaft in a clamped mode in the radial direction of the rotating shaft hole. A plurality of ratchets in the clockwise direction are distributed on a rotating shaft through which the foot rest is connected with an overturning fixing joint, a fixing pin capable of moving back and forth towards the ratchets is arranged in the overturning fixing joint, and the end of the fixing pin is matched with and abuts against the belly portions of the ratchets, so that rotation of the rotating shaft in the clockwise direction of the ratchets is blocked. And the foot rest can stably stay at the angle at the moment.

Description

Technical Field

[0001] The utility model belongs to the technical field of seat manufacturing, and particularly relates to a footrest flipping and fixing mechanism and a swivel chair. Background Art

[0002] A seat is a sitting tool with a backrest and some also have armrests. With the development of society, seats are designed with more ergonomic structures according to the user's usage environment to facilitate a better user experience. Among them, a footrest structure is added under the seat cushion to allow the user's legs and feet to be relaxed.

[0003] A flipping and adjusting mechanism for a footrest disclosed in Patent CN214711614U includes a support frame and a footrest. A support shaft is provided at the front end of the support frame, and the footrest is rotationally matched with the support shaft. A flipping and adjusting mechanism is provided on the support shaft. The flipping and adjusting mechanism includes a pressing block, a spring, and a roller for controlling the movement of the pressing block along the axial direction of the support shaft; the roller is installed on the support shaft; along the circumferential direction of the support shaft, the pressing block is always circumferentially fixed to the footrest. An inclined contact surface for contacting and cooperating with the roller is formed at one end of the pressing block. A highest point and a lowest point are provided on the contact surface, and first and second roller guiding paths are symmetrically arranged between the highest point and the lowest point; under the action of the spring, the roller always has a tendency to keep contacting the lowest point; when the pressing block rotates with the footrest, with the assistance of the spring, the roller crosses the highest point and tends to the lowest point along the first or second roller guiding path in the rotation direction of the footrest. The spring can assist the footrest to flip a certain angle and then open automatically.

[0004] In the above solution, through the flipping and adjusting mechanism provided on the support shaft, during the flipping process of the footrest, the spring always provides an elastic force acting on the flipping of the footrest, so that the footrest has a good damping feeling during the flipping process. However, only using the spring to provide damping cannot fix the footrest at a certain position, and the damping feeling will decay with the supporting weight and the service life of the spring, thus unable to meet the needs of users. Summary of the Utility Model

[0005] The purpose of the present utility model is to solve the above problems by providing a footrest flipping and fixing mechanism and a swivel chair that can solve the above technical problems.

[0006] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0007] The footrest flipping and fixing mechanism includes a flipping and fixing section and a footrest frame rotatably connected to the flipping and fixing section. One end of the flipping and fixing section is provided with a rotating shaft hole, and a rotating shaft rotatably inserted into the rotating shaft hole is arranged on the footrest frame. A sliding track communicating with the rotating shaft hole is formed in the flipping and fixing section, and a fixing pin is slidably arranged in the sliding track. The fixing pin is clamped and matched with a fixing structure arranged on the rotating shaft along the radial direction of the rotating shaft hole.

[0008] In the footrest flipping and fixing mechanism, the fixing structure includes at least one week of ratchet teeth circumferentially arranged on the rotating shaft, and the end of the fixing pin abuts against the tooth belly groove of the ratchet teeth.

[0009] In the footrest flipping and fixing mechanism, one end of the fixing pin is provided with a fixing spring abutting against the wall of the sliding track, and the other end of the fixing pin is provided with an inclined surface which is in sliding contact with the tooth back of the ratchet teeth.

[0010] In the footrest flipping and fixing mechanism, the fixing structure includes at least one week of receiving and fixing grooves circumferentially arranged on the rotating shaft, and the receiving and fixing grooves are clamped and matched with the end of the fixing pin.

[0011] In the footrest flipping and fixing mechanism, a plurality of damping strips are axially arranged on the inner wall of the rotating shaft hole, and the damping strips are in friction with the outer arc surface of the rotating shaft.

[0012] In the footrest flipping and fixing mechanism, a control track perpendicular to and communicating with the sliding track is further arranged in the flipping and fixing section, and a control key is slidably arranged in the control track. One end of the control key obliquely abuts against the fixing pin.

[0013] In the footrest flipping and fixing mechanism, one end of the control key extends out of the flipping and fixing section from the control track, and the other end of the control key is provided with a pressing inclined surface which is in sliding contact with the fixing pin.

[0014] In the footrest flipping and fixing mechanism, an end cover is arranged on the flipping and fixing section. The inner side of the end cover forms the bottom surface of the sliding track. A limiting sleeve perpendicular to the sliding track is arranged on the inner side surface of the end cover, and a limiting column in clearance fit with the limiting sleeve is arranged on the control key.

[0015] In the footrest flipping and fixing mechanism, an extension connecting rod is arranged on one side of the flipping and fixing section away from the footrest frame, and the extension connecting rod is in a hollow elliptical shape.

[0016] The present utility model further provides a swivel chair, and the swivel chair includes the footrest flipping and fixing mechanism.

[0017] The advantages of the present utility model are:

[0018] A plurality of ratchets in the same clockwise direction are distributed on the rotating shaft connecting the footrest and the flipping and fixing section. A fixing pin that can move back and forth toward the ratchets is arranged in the flipping and fixing section. The end of the fixing pin cooperates with and abuts against the flank of the ratchet, so that the rotation of the rotating shaft in the clockwise direction of the ratchet is blocked, ensuring that the footrest can stably stay at the current angle and will not change due to the weight of the supported object. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the footrest flipping and fixing mechanism of the present utility model.

[0020] Figure 2 It is a schematic diagram of the interior of the footrest flipping and fixing mechanism of the present utility model.

[0021] Figure 3 It is a schematic diagram of the rotating shaft of the present utility model.

[0022] Figure 4 It is a schematic diagram of the cooperation between the fixing pin and the control key of the present utility model.

[0023] Figure 5 It is a schematic diagram of the end cap of the present utility model.

[0024] In the illustration, the flipping and fixing section 1, the rotating shaft hole 11, the sliding track 12, the damping strip 13, the control track 14, the end cap 15, the limiting sleeve 16, the footrest 2, the rotating shaft 21, the ratchet 22, the receiving and fixing groove 23, the fixing pin 31, the fixing spring 32, the control key 33, the limiting post 34, the extending connecting rod 4. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following are specific embodiments of the utility model and in combination with the accompanying drawings, the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments.

[0026] Embodiment 1

[0027] As Figures 1 - 5 shown, the footrest flipping and fixing mechanism includes a flipping and fixing section 1 and a footrest 2 rotatably connected to the flipping and fixing section 1. It is characterized in that a rotating shaft hole 11 is opened at one end of the flipping and fixing section 1, a rotating shaft 21 rotatably inserted into the rotating shaft hole 11 is arranged on the footrest 2, a sliding track 12 communicating with the rotating shaft hole 11 is opened inside the flipping and fixing section 1, a fixing pin 31 is slidably arranged in the sliding track 12, and the fixing pin 31 is clamped and matched with a fixing structure arranged on the rotating shaft 21 along the radial direction of the rotating shaft hole 11.

[0028] That is, a plurality of fixing structures are distributed on the rotating shaft where the footrest 2 is connected to the flipping and fixing section 1, and a fixing pin 31 that can move back and forth relative to the fixing structures is arranged in the flipping and fixing section 1. The end of the fixing pin 31 cooperates with and abuts against the fixing structures, restricting the rotation of the rotating shaft 21 and ensuring that the footrest 2 can stably stay at the current angle without being affected by the weight of the supported object and changing.

[0029] In this embodiment, the fixing structure includes at least one circumferentially arranged ratchet tooth 22 on the rotating shaft 21, and the end of the fixing pin 31 abuts against the tooth flank groove of the ratchet tooth 22.

[0030] Due to the unidirectional characteristic of the ratchet tooth 22, when the footrest 2 swings outwards from under the seat cushion, the tooth back of the ratchet tooth 22 cannot form a fixed engagement with the end of the fixing pin 31. At this time, the flipping of the footrest 2 will not be blocked. When the footrest 2 moves in the reverse direction, the fixing pin 31 will be caught in the tooth flank groove of the ratchet tooth 22, blocking the continued rotation of the rotating shaft 21, that is, fixing the swinging angle of the footrest 2.

[0031] In this embodiment, one end of the fixing pin 31 is provided with a fixing spring 32 that abuts against the wall of the sliding track 12, and the other end of the fixing pin 31 is provided with an inclined surface that slidably contacts the tooth back of the ratchet tooth 22.

[0032] The fixing spring 32 provides a continuous pushing force for the fixing pin 31 to move towards the rotating shaft 21. The end of the fixing pin 31 will always abut against the rotating shaft 21. The cooperation between the end of the fixing pin 31 and the tooth flank groove will not cause the footrest 2 to suddenly lose support due to the accidental displacement of the fixing pin 31, ensuring the stability and safety of the footrest 2.

[0033] The end of the fixing pin 3 that contacts the rotating shaft 21 is provided with an inclined surface, which can reduce the frictional force when contacting the tooth back of the ratchet tooth 22, making the unfolding of the footrest 2 smoother. Due to the tip formed by the inclined surface, the force is more inclined to the tangential direction of the rotating shaft 21, that is, when cooperating with the tooth flank groove, the fixing pin 31 can apply a greater braking force to the rotating shaft 21 to stabilize the footrest 2.

[0034] In this embodiment, the fixing structure includes at least one circumferentially arranged receiving and fixing groove 23 on the rotating shaft 21, and the receiving and fixing groove 23 is in clamping cooperation with the end of the fixing pin 31.

[0035] There is not only fixation when the footrest 2 is unfolded outwards, but also a fixing structure when the footrest 2 is retracted inwards, so that the footrest 2 will not obstruct the interactive space of the legs and feet when the user does not need the footrest.

[0036] In this embodiment, a plurality of damping strips 13 are axially arranged on the inner wall of the rotating shaft hole 11, and the damping strips 13 rub against the outer arc surface of the rotating shaft 21.

[0037] The damping bars 13 are evenly distributed on the inner wall of the rotating shaft hole 11, providing uniform frictional resistance for the rotation of the rotating shaft 21, making the rotation of the footrest 2 slower. Especially when the fixing pin 31 is unlocked, the footrest 2 can slowly fall automatically without being supported by hand, avoiding collision accidents caused by the sudden fall of the footrest 2 due to operation errors.

[0038] In this embodiment, a control track 14 perpendicular and communicating with the sliding track 12 is further provided in the flipping fixing section 1. A control key 33 is slidably arranged in the control track 14, and one end of the control key 33 abuts obliquely against the fixing pin 31.

[0039] The control track 14 provides a space for the control key 33 to move up and down. When the control key 33 is pressed, it will obliquely squeeze the fixing pin 31 to slide it away from the rotating shaft 21, thus unlocking the locking of the rotating shaft 21. After releasing the control key 33, due to the thrust of the fixing spring 32, the fixing pin 31 returns to its previous position and pushes the control key 33 up again.

[0040] In this embodiment, one end of the control key 33 extends out of the flipping fixing section 1 from the control track 14, and an extrusion inclined surface is provided at the other end of the control key 33, and the extrusion inclined surface is in sliding contact with the fixing pin 31.

[0041] A through hole is provided on the fixing pin 31, and the side wall of the through hole far from the rotating shaft 21 is set as an inclined surface, and the extrusion block at the lower end of the control key 33 passes through the through hole, and the extrusion inclined surface is in contact with the inclined surface of the side wall of the through hole. The continuously descending control key 33 squeezes the fixing pin 31 to the side away from the rotating shaft 21 to achieve unlocking.

[0042] In this embodiment, an end cover 15 is provided on the flipping fixing section 1. The inner side of the end cover 15 forms the bottom surface of the sliding track 12, and a limiting sleeve 16 perpendicular to the sliding track 12 is provided on the inner side surface of the end cover 15. A limiting column 34 in clearance fit with the limiting sleeve 16 is provided on the control key 33.

[0043] On the opposite side surface of the control key 33, it is formed by splicing the end cover 15, which is fixed by detachable bolts. The end cover 15 can be opened for maintenance when the parts are damaged. The inner side surface of the end cover 15 and the inner plane of the flipping fixing section 1 together form the sliding track 12, so it is also more conducive to the installation of the parts inside the flipping fixing section 1.

[0044] At the same time, a limiting sleeve 16 is also provided on the inner side of the end cover 15 to cooperate with the limiting column 34. The two form an additional auxiliary guide rail, so that the part of the control key 33 entering the sliding track 12 can also have its movement track restricted.

[0045] In this embodiment, an extension link 4 is provided on the side of the flipping fixing section 1 away from the footrest 2, and the extension link 4 is in a hollow elliptical shape.

[0046] The extension link 4 is fixedly connected to the lower end of the seat cushion, extending the footrest 2 to the position of the lower edge of the seat cushion, without blocking the normal movement space of the feet.

[0047] The extension link 4 is an elliptical hollow tube, providing high bending resistance while reducing its own weight and occupying less space.

[0048] Embodiment 2

[0049] Apply the technical solution of Embodiment 1 to the swivel chair. The lower end surface of the seat cushion is equipped with a structure for inserting the end of the extension link 4, and it is very convenient to disassemble and assemble with only bolts. Grooves for installing the bearing surface are reserved on the frame of the footrest 2, which can be applicable to bearing surfaces of various materials.

[0050] The extension link 4 can also be inserted into another pipe fitting installed on the lower side of the seat cushion, enabling the two to slide axially and realizing the telescopic function of the footrest 2 in the front and back directions.

[0051] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A footrest flipping and fixing mechanism, comprising a flipping and fixing section (1) and a footrest frame (2) rotatably connected to the flipping and fixing section (1), characterized in that: A rotating shaft hole (11) is provided at one end of the flip fixing section (1); a rotating shaft (21) rotatably inserted in the rotating shaft hole (11) is provided on the footrest (2); a sliding track (12) communicating with the rotating shaft hole (11) is provided in the flip fixing section (1); a fixing pin (31) is slidably provided in the sliding track (12); and the fixing pin (31) is snap-fitted with a fixing structure provided on the rotating shaft (21) along a radial direction of the rotating shaft hole (11).

2. The footrest flipping and fixing mechanism according to claim 1, characterized in that: The fixing structure comprises at least one ratchet tooth (22) circumferentially arranged on the rotating shaft (21), and the end of the fixing pin (31) abuts against a tooth flank groove of the ratchet tooth (22).

3. The footrest flipping and fixing mechanism according to claim 2, characterized in that: One end of the fixing pin (31) is provided with a fixing spring (32) that abuts against the wall of the sliding track (12), and the other end of the fixing pin (31) is provided with an inclined surface, and the inclined surface is in sliding contact with the tooth back of the ratchet tooth (22).

4. The footrest flipping and fixing mechanism according to claim 1, characterized in that: The fixing structure comprises at least one circumferentially arranged receiving and fixing groove (23) on the rotating shaft (21), and the receiving and fixing groove (23) is snap-fitted with the end of the fixing pin (31).

5. The footrest flipping and fixing mechanism according to claim 1, characterized in that: A plurality of damping strips (13) are axially arranged on the inner wall of the rotating shaft hole (11), and the damping strips (13) rub against the outer arc surface of the rotating shaft (21).

6. The footrest flipping and fixing mechanism according to claim 1, characterized in that: The flip fixing joint (1) is also provided with a control track (14) vertically connected to the sliding track (12), and a control key (33) is slidably provided in the control track (14), and one end of the control key (33) is obliquely abutted against the fixing pin (31).

7. The footrest flipping and fixing mechanism according to claim 6, characterized in that: One end of the control key (33) extends out of the flip fixing section (1) from the control track (14), and the other end of the control key (33) is provided with an extrusion slope, which is in sliding contact with the fixing pin (31).

8. The footrest flipping and fixing mechanism according to claim 6, characterized in that: The flip fixing joint (1) is provided with an end cover (15), the inner side of the end cover (15) forms the bottom surface of the sliding track (12), the inner side surface of the end cover (15) is provided with a limiting sleeve (16) perpendicular to the sliding track (12), and the control key (33) is provided with a limiting column (34) which is clearance-matched with the limiting sleeve (16).

9. The footrest flipping and fixing mechanism according to claim 1, characterized in that: An extension connecting rod (4) is provided on a side of the flip fixing joint (1) away from the footrest (2); the extension connecting rod (4) is in a hollow elliptical shape.

10. A swivel chair, characterized in that: The swivel chair comprises the footrest flipping and fixing mechanism according to any one of claims 1-9.

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