A footrest for ergonomic chair

Abstract

The present invention relates to the technical field of ergonomic chairs, and in particular to a footrest for an ergonomic chair, which comprises a fixed seat fixed to the lower part of the chair seat cushion, a support arm, an angle adjustment seat installed in the fixed seat for adjusting the support arm in a use or folded state, a sliding assembly slidably connected to the support arm for extending the length of the support arm, and a pedal member fixed to the sliding assembly for supporting a human foot. The present invention has the effect of facilitating the relaxation of the human leg.

Description

Technical Field

[0001] The invention relates to the technical field of ergonomic chairs, and in particular to a footrest for ergonomic chairs. Background Art

[0002] At present, ergonomic chairs mainly use elastic and environmentally friendly materials such as mesh cloth, environmentally friendly cloth and memory foam to make seat cushions and chair backs. The overall structural design conforms to the human body mechanics structure, which can reduce the pressure area of ​​the user's buttocks and back, press the acupoints at the stress point, promote blood circulation in the buttocks and back, and avoid strain on the neck, shoulders and waist, which is very beneficial to the health of people who sit for a long time.

[0003] The existing Chinese invention patent with authorization announcement number CN210095152U discloses an ergonomic chair structure, which includes a chair leg, a backrest mechanism, a telescopic rod, a seat cushion, a left bracket and a right bracket, wherein the telescopic rod is arranged at the upper end of the chair leg, the seat cushion is arranged at the upper end of the telescopic rod, the seat cushion is placed horizontally, and a left bracket and a right bracket are respectively arranged on both sides of the rear end of the seat cushion; a first T-shaped slide groove penetrating the left bracket is arranged on the left side of the left bracket, and a second T-shaped slide groove penetrating the right bracket is arranged on the right side of the right bracket; the backrest mechanism includes a first cross bar and a second cross bar parallel to each other, a left soft wire, a right soft wire, and a backrest cloth, and the two ends of the first cross bar respectively pass through the first T-shaped slide groove and the second T-shaped slide groove to bring the left soft wire and the right soft wire into the left bracket and the right bracket; when in use, it can make the buttocks, back and shoulders and neck of the human body all get better relaxation, and at the same time it is convenient to disassemble and wash the backrest cloth, which is beneficial to health.

[0004] The above-mentioned prior art solutions have the following defects: when using the above-mentioned chair, the human body's feet are on the ground, the blood circulation in the legs is not smooth, and the problem of leg discomfort is easy to occur after a long time. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide a footrest for an ergonomic chair that is conducive to relaxing the legs of a human body.

[0006] The above-mentioned inventive object of the present invention is achieved through the following technical solutions: a footrest for an ergonomic chair, comprising a fixed seat fixed to the lower part of the chair seat cushion, a support arm, an angle adjustment seat installed in the fixed seat for adjusting the support arm in use or folded state, a sliding assembly slidably connected to the support arm for extending the length of the support arm, and a pedal fixed to the sliding assembly for supporting the human foot.

[0007] By adopting the above technical solution, when the foot pedal is to be used, the support arm is first rotated outward to a horizontal position, that is, the use state, and then the length of the support arm is extended by the sliding assembly. After that, the user can step on the pedal after sitting on the seat cushion. At this time, the calf and thigh are supported, and the blood circulation with the upper torso is better, which is very beneficial to the health of people who sit for a long time; when the foot pedal is not in use, the sliding assembly is first retracted, and then the support arm is rotated in the opposite direction to the lower part of the chair, that is, the folded state, which is also convenient for the normal use of the chair.

[0008] In a preferred example, the present invention can be further configured as follows: a limiting cylinder is fixedly connected to the fixed seat; an arc-shaped protrusion protrudes from the limiting cylinder, and the arc-shaped protrusion cooperates with the inner wall of the limiting cylinder to form at least two arc-shaped embedding grooves; the angle adjustment seat includes a rotating shaft, and the middle part of the rotating shaft passes through the limiting cylinder; a retaining ring is provided on the rotating shaft, and an arc-shaped insert plate is axially protruded on the retaining ring, the outer diameter of the retaining ring is adapted to the inner diameter of the limiting cylinder and the arc-shaped insert plate is adapted to any one of the arc-shaped embedding grooves; the support arm is fixed to the end of the rotating shaft.

[0009] By adopting the above technical solution, when the arc-shaped panel is embedded in the arc-shaped embedding groove, the rotation of the rotating shaft will be restricted, so that the support arm can be kept in a certain position state; the position state of the support arm can be adjusted more conveniently.

[0010] In a preferred example, the present invention can be further configured as follows: the clamping ring is slidably connected to the rotating shaft; a strip-shaped clearance hole is opened in the middle of the rotating shaft; a push rod is slidably connected in the rotating shaft, and a convex column is fixed on the push rod, the convex column extends out of the clearance hole and is inserted into the clamping ring; a telescopic spring is arranged between the support arm and the clamping ring; the arc-shaped panel and the telescopic spring are respectively located on both sides of the clamping ring.

[0011] By adopting the above technical solution, when pushing or pulling the push rod, the convex column can drive the clamping ring to slide, thereby making the arc-shaped embedded plate enter or exit the arc-shaped embedded groove, and the overall operation is more convenient.

[0012] In a preferred example, the present invention can be further configured as follows: the sliding assembly includes an inner cylinder sleeved on the support arm, an outer cylinder sleeved on the outside of the inner cylinder and fixed to the inner cylinder, and a positioning member for positioning the sliding position of the inner cylinder on the support arm.

[0013] By adopting the above technical solution, the inner cylinder uses the support arm as a slide rail, so that the sliding structure formed is relatively simple and relatively reliable in use.

[0014] In a preferred example, the present invention can be further configured as follows: a strip-shaped adjustment hole is opened on the support arm in the horizontal direction, a proximal slot is connected to the end of the adjustment hole close to the rotating shaft, and a distal slot is connected to the end of the adjustment hole away from the rotating shaft, the diameters of the proximal slot and the distal slot are the same and larger than the width of the adjustment hole; the positioning member includes a plug and a trigger rod with one end fixed to the plug; the diameter of the plug is larger than the diameter of the trigger rod; a first through hole and a second through hole are opened on the inner tube for the plug and the trigger rod to pass through; a mounting hole is opened on the outer tube for the plug and the trigger rod to pass through; the diameter of the plug is adapted to the proximal slot and the distal slot, and its diameter is larger than the width of the adjustment hole; the diameter of the trigger rod is smaller than the width of the adjustment hole.

[0015] By adopting the above technical solution, when the inner cylinder is in a shortened state, the plug is inserted into the proximal slot, and the sliding of the inner cylinder is restricted by the plug; when the inner cylinder is to be slid out, the plug is pulled out of the proximal slot, and the trigger rod is located in the proximal slot at this time. The diameter of the trigger rod is smaller than the width of the adjustment hole, and there will be no obstruction when sliding out of the inner cylinder; when the inner cylinder slides to the position farthest from the fixed seat, it is just in the extreme position of extension, and the plug can be inserted into the distal slot to restrict the sliding of the contents. The overall positioning of the inner cylinder is relatively convenient, and the user can adjust it more conveniently and quickly during use.

[0016] In a preferred example, the present invention can be further configured as follows: a circular end cap is provided at the end of the plug column, the diameter of the circular end cap is larger than the diameter of the plug column and is adapted to the mounting hole; an outer cover is fixedly connected to the end of the trigger rod away from the plug column, the diameter of the outer cover is larger than the diameter of the trigger rod and is adapted to the mounting hole.

[0017] By adopting the above technical solution, on the one hand, the cooperation between the circular end and the outer cover makes it easier to adjust the position of the plug and the trigger rod; on the other hand, it can also prevent the plug and the trigger rod from detaching from the adjustment hole under abnormal circumstances.

[0018] In a preferred example, the present invention can be further configured as follows: a return spring with one end abutting against the outer cover and the other end abutting against the support arm is sleeved on the trigger rod.

[0019] By adopting the above technical solution, the reset spring can make the plug column reliably inserted into the proximal slot or the distal slot, making the entire device more reliable when in use; at the same time, the user can easily adjust the position of the inner cylinder by pressing the outer cover to compress the reset spring, which is more convenient to use.

[0020] In a preferred example, the present invention can be further configured as follows: the support arm includes a connecting rod with one end fixed to the end of the rotating shaft, an extension rod with one end fixed to the connecting rod, and an I-shaped rod with one end fixed to the other end of the extension rod and an I-shaped cross-section; the inner tube includes a rectangular tube section with a rectangular opening cross-section, and an I-shaped tube section that is coaxial with the rectangular tube section and connected to the rectangular tube section at one end, and the inner cavity of the I-shaped tube section is adapted to the cross-section of the I-shaped rod.

[0021] By adopting the above technical solution, the cooperation between the I-shaped rod on the support arm and the inner I-shaped tube section makes the inner tube slide more linearly, the entire sliding process is smoother and more reliable, and the user is more convenient and quick when adjusting.

[0022] In a preferred example, the present invention can be further configured as follows: the treading member includes two rotating connecting rods and a pedal fixed between the two rotating connecting rods; the rotating connecting rod is rotatably connected to the inner side of the outer tube, an unfolding and placing platform is provided on the outer tube, and a placing edge is provided on the rotating connecting rod close to the unfolding and placing platform. When the rotating connecting rod is rotated outward and unfolded, the placing edge is placed on the unfolding and placing platform.

[0023] By adopting the above technical solution, when using the pedal, the user generally adjusts the footrest first, then sits on the seat cushion and then steps on the pedal; if the overall length of the pedal is long, it will hinder people from sitting on the seat cushion, causing inconvenience to the user; providing a rotating connecting rod can first rotate and fold the pedal, and then unfold it after the user sits on the seat cushion, which is more convenient to use; the mounting edge and the unfolding mounting platform enable the pedal to have sufficient supporting capacity, and can reliably support the weight of the human leg.

[0024] In a preferred example, the present invention can be further configured as follows: a folding platform is provided on the outer cylinder, and when the rotating connecting rod is rotated inward and folded, the rotating connecting rod is placed on the folding platform; at the same time, a positioning hole is opened on the outer cylinder above the folding platform, and a ball screw is fixed to the rotating connecting rod, and the output end of the ball screw corresponds to the positioning hole.

[0025] By adopting the above technical scheme, under normal circumstances, when the rotating connecting rod is in a folded state, the top ball on the top ball screw is just embedded in the positioning hole, and the cooperation between the top ball and the positioning hole can prevent the pedal from further rotating downward; however, in actual use, the user generally uses a lot of force before folding the rotating connecting rod and sitting on the seat cushion, and the rotating connecting rod is easy to rotate too far at this time; providing a folding platform can limit the continued downward rotation of the rotating connecting rod after folding, thereby avoiding the occurrence of this situation and facilitating use; when the rotating connecting rod is rotated and folded, and rotated in the opposite direction to rotate the support arm to the bottom of the seat cushion, the cooperation between the top ball screw and the positioning hole only needs to overcome the gravity of the pedal itself, and there is no artificial external force, so it is sufficient to keep the rotating connecting rod reliably in the folded state.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects:

[0027] 1. By setting the footrest, the user can step on the pedal after sitting on the seat cushion, so as to maintain good blood circulation in the calf, thigh and upper torso, which is beneficial to the health of people who sit for a long time. When the footrest is not in use, the footrest can be folded up, which is conducive to the normal use of the chair;

[0028] 2. The angle adjustment seat has a simple and reliable structure, making it convenient to unfold or fold the support arm;

[0029] 3. The sliding assembly is more reliable and convenient to adjust, making the use of the pedal more convenient and quick;

[0030] 4. The pedal can be folded up, which is convenient for people to sit on the cushion during use, and is also convenient for storage under the cushion when not in use. The overall space occupied is small and it is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the pedal.

[0032] Figure 2 It is a schematic diagram showing the structure of the fixed seat.

[0033] Figure 3 It is a structural schematic diagram showing the structure of a clamping ring in an angle adjustment seat.

[0034] Figure 4 It is a structural diagram showing the matching form of the push rod, the retaining ring and the rotating shaft.

[0035] Figure 5 It is a structural schematic diagram showing the matching form of the outer cylinder and the inner cylinder.

[0036] Figure 6 It is a structural schematic diagram showing the matching form of the positioning piece and the adjustment hole.

[0037] Figure 7 It is a cross-sectional view showing the matching form of the outer cylinder, the inner cylinder and the I-shaped rod.

[0038] Figure 8 It is a schematic diagram showing the structure of a treadle.

[0039] In the figure, 1, fixed seat; 10, side plate; 11, bottom plate; 12, end plate; 120, shaft hole; 13, limiting cylinder; 130, arc-shaped protrusion; 131, arc-shaped embedded groove; 2, angle adjustment seat; 20, rotating shaft; 200, clearance hole; 21, snap ring; 210, arc-shaped embedded plate; 211, limiting hole; 22, push rod; 220, protruding column; 23, telescopic spring; 24, pressing button; 3, supporting arm; 30, connecting rod; 31, extension rod; 32, I-shaped rod; 320, adjustment hole; 321, proximal slot hole; 322, distal slot hole; 4. Sliding assembly; 40. Inner tube; 400. Rectangular tube section; 401. I-shaped tube section; 402. First through hole; 403. Second through hole; 404. Stop edge; 405. Block; 41. Outer tube; 410. Positioning hole; 411. Expandable platform; 412. Folding platform; 413. Mounting hole; 414. Positioning hole; 42. Positioning piece; 420. Plug; 421. Trigger rod; 422. Outer cover; 423. Return spring; 5. Pedal; 50. Rotating connecting rod; 500. Platform edge; 51. Pedal; 52. Ball screw. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0041] Reference Figure 1 , a footrest for an ergonomic chair disclosed in the present invention, includes a fixed seat 1 fixed to the lower part of the chair cushion, an angle adjustment seat 2 installed in the fixed seat 1 for adjusting a support arm 3 in use or folded state, a sliding assembly 4 slidably connected to the support arm 3 for extending the length of the support arm 3, and a pedal 5 fixed to the sliding assembly 4 for supporting a human foot.

[0042] Combination Figure 1 , Figure 2 The fixing seat 1 includes two side panels 10 arranged opposite to each other, a bottom plate 11 fixed between the bottoms of the two side panels 10, and two end panels 12 fixed at both ends of the two side panels 10 and fixed to the bottom plate 11. The side panels 10, the bottom plate 11 and the end panels 12 are integrally formed and are preferably made of plastic. The side panels 10, the bottom plate 11 and the end panels 12 enclose a long groove with an open top. Both end panels 12 are provided with shaft holes 120, and the axes of the two shaft holes 120 coincide with the axes of the length direction of the long groove. The upper edge of the side panel 10 is folded outward to form a connecting portion, and a threaded hole is provided on the connecting portion along the length direction; the fixing seat 1 can be fixed to the lower part of the cushion by passing a screw through the connecting portion. A limiting cylinder 13 is fixed in the long groove, and the axis of the limiting cylinder 13 coincides with the axis of the shaft hole 120. An arc-shaped protrusion 130 protrudes from the limiting cylinder 13 , and the arc-shaped protrusion 130 cooperates with the inner wall of the limiting cylinder 13 to form two arc-shaped embedded grooves 131 ; the two arc-shaped embedded grooves 131 are distributed up and down.

[0043] Next, combine Figure 1 , Figure 2 , Figure 3 The angle adjustment seat 2 includes a rotating shaft 20, the middle of which passes through the limiting cylinder 13 and the two ends of which pass through the shaft holes 120. A clamping ring 21 is sleeved on the rotating shaft 20, and the inner diameter of the clamping ring 21 is larger than the outer diameter of the rotating shaft 20. An arc-shaped insert plate 210 is axially protruded on the clamping ring 21, and the outer diameter of the clamping ring 21 is adapted to the inner diameter of the limiting cylinder 13, and the arc-shaped insert plate 210 is adapted to any arc-shaped insert groove 131. Figure 4 The rotating shaft 20 is a hollow structure. A strip-shaped clearance hole 200 is provided in the middle of the rotating shaft 20. The length direction of the clearance hole 200 is parallel to the length direction of the rotating shaft 20 and is connected to the inside of the rotating shaft 20. A push rod 22 is inserted in the rotating shaft 20. A boss 220 is fixedly connected to the push rod 22. The diameter of the boss 220 is smaller than the width of the clearance hole 200 and extends out of the clearance hole 200. A limiting hole 211 is provided on the snap ring 21. The boss 220 is inserted into the limiting hole 211. The two ends of the rotating shaft 20 are cut to form a plane, and the cross section is D-shaped. The support arm 3 is sleeved on the end of the rotating shaft 20 and is tightly fitted with each other. A telescopic spring 23 is sleeved on the rotating shaft 20. One end of the telescopic spring 23 abuts on the support arm 3, and the other end elastically abuts on the snap ring 21; the arc-shaped panel 210 and the telescopic spring 23 are respectively located on both sides of the snap ring 21.

[0044] A push button 24 is fixedly connected to one end of the push rod 22 outside the rotating shaft 20. Operating the push button 24 can compress the telescopic spring 23 and simultaneously push the clamping ring 21 in the direction of disengaging from the arc-shaped embedded groove 131. When the arc-shaped embedded plate 210 on the clamping ring 21 is disengaged from the arc-shaped embedded groove 131, the rotation of the rotating shaft 20 is no longer restricted. At this time, the support arm 3 can be rotated to the use state, that is, the state in which the support arm 3 is horizontally arranged, such as Figure 1 The state of the support arm 3, or the folded state, is to rotate the support arm 3 in the opposite direction (from top to bottom around the rotation axis 20) to below the seat cushion; then release the push button 24, the telescopic spring 23 will restore its length, push the arc-shaped panel 210 to insert into the corresponding arc-shaped groove 131, limit the rotation of the rotation axis 20, and keep the support arm 3 in the use or folded state.

[0045] Reference Figure 6The support arm 3 includes a connecting rod 30 with one end sleeved on the end of the rotating shaft 20 and tightly fitted with each other, an extension rod 31 with one end integrally connected to the connecting rod 30, and an I-shaped rod 32 with one end integrally connected to the other end of the extension rod 31 and an I-shaped cross section. A strip-shaped adjustment hole 320 is opened in the horizontal direction on the I-shaped rod 32, and a proximal slot 321 is connected to the end of the adjustment hole 320 close to the extension rod 31, and a distal slot 322 is connected to the end of the adjustment hole 320 away from the extension rod 31. The proximal slot 321 and the distal slot 322 have the same diameter and are larger than the width of the adjustment hole 320.

[0046] Reference Figure 5 The sliding assembly 4 includes an inner cylinder 40 sleeved on the extension rod 31 and the I-shaped rod 32, an outer cylinder 41 sleeved on the outside of the inner cylinder 40 and fixed to the inner cylinder 40, and a positioning member 42 for positioning the sliding position of the inner cylinder 40 on the support arm 3. The inner cylinder 40 includes a rectangular tube section 400 with a rectangular opening cross section, an I-shaped tube section 401 coaxial with the rectangular tube section 400 and connected to the rectangular tube section 400 at one end, a stop edge 404 arranged on one end of the rectangular tube section 400 away from the I-shaped tube section 401, and a clamping block 405 fixed on the inner side of the rectangular tube section 400, the side of the clamping block 405 away from the stop edge 404 is provided with an inclined surface and the side opposite to the stop edge 404 is provided with a vertical surface; the inner cavity of the I-shaped tube section 401 is adapted to the cross section of the I-shaped rod 32, so that the inner cylinder 40 can slide more smoothly.

[0047] The outer cylinder 41 is provided with a positioning hole 410 at the position corresponding to the clamping block 405, and the clamping block 405 is clamped in the positioning hole 410. The axial movement of the outer cylinder 41 is limited by the retaining edge 404 and the vertical surface of the clamping block 405. The inclined surface of the clamping block 405 facilitates the insertion of the outer cylinder 41. The outer cylinder 41 has a certain deformation ability. When the outer cylinder 41 is pushed hard, the end of the outer cylinder 41 will gradually open and pass over the clamping block 405 until the clamping block 405 enters the positioning hole 410, and the end of the outer cylinder 41 returns to its original state. The clamping block 405 will hinder the installation of the outer cylinder 41, but the installation can be completed by force. The outer cylinder 41 is preferably made of plastic or aluminum alloy material, which can take into account both strength and installation convenience. The pedal 5 is installed on the outer cylinder 41.

[0048] Main reference Figure 7 , and combined with Figure 5 , Figure 6 , a first through hole 402 and a second through hole 403 are relatively opened on the I-shaped tube section 401 corresponding to the installation position of the positioning member 42, the diameter of the first through hole 402 is larger than the diameter of the second through hole 403, the center line of the first through hole 402 and the second through hole 403 is in a horizontal state, the first through hole 402 is located on the inner side, and the second through hole 403 is located on the outer side. A mounting hole 413 is opened in the horizontal direction on the outer tube 41 corresponding to the installation position of the positioning member 42.

[0049] The positioning member 42 includes a plug 420, a trigger rod 421 with one end fixed to the plug 420, an outer cover 422 fixed to the other end of the trigger rod 421, and a return spring 423 sleeved on the trigger rod 421, one end of which abuts against the outer cover 422 and the other end abuts against the I-shaped pipe section 401; the outer diameter of the plug 420 is adapted to the first through hole 402, and a circular end head is provided at the end of the plug 420, the diameter of the circular end head is larger than the diameter of the plug 420 and is adapted to the mounting hole 413; the diameter of the plug 420 is larger than the diameter of the trigger rod 421, in this example, the plug 420 is provided with an internal thread, and the end of the trigger rod 421 is provided with an external thread, and the two are connected by threads; in addition, the plug 420 and the trigger rod 421 can also be fixed by other common methods such as bonding, plugging, clamping, and fastener fixing. The diameter of the trigger rod 421 is adapted to the second through hole 403. The diameter of the outer cover 422 is larger than the diameter of the trigger rod 421 and is adapted to the mounting hole 413. The diameter of the plug 420 is adapted to the proximal slot 321 and the distal slot 322, and its diameter is larger than the width of the adjustment hole 320. The diameter of the trigger rod 421 is smaller than the width of the adjustment hole 320. After the return spring 423 is completely compressed, the plug 420 can withdraw from the proximal slot 321 or the distal slot 322.

[0050] Main reference Figure 7 , and combined with Figure 5 , Figure 6 When using the sliding assembly 4, press the outer cover 422 to push the plug 420 out of the proximal slot 321 or the distal slot 322 and make the trigger rod 421 enter the proximal slot 321 or the distal slot 322; then the outer tube 41 can be moved back and forth to shorten or lengthen the adjustment; when it is adjusted to the corresponding position, release the outer cover 422, and under the action of the return spring 423, the plug 420 will enter the corresponding proximal slot 321 or the distal slot 322, thereby preventing the outer tube 41 from sliding and positioning the position of the pedal 5.

[0051] Reference Figure 8 The pedal 5 includes two rotating connecting rods 50, a pedal 51 fixed between the two rotating connecting rods 50, and a ball screw 52. The upper surface of the pedal 51 is evenly distributed with grooves to form a rough surface, so that the foot of the user is not likely to slip when stepping on it. Figure 3 , Figure 5A first rotating seat hole is provided on the rotating connecting rod 50, and a second rotating seat hole is provided on the end of the outer cylinder 41 away from the support arm 3, and a pin is provided in the first rotating seat hole and the second rotating seat hole. The rotating connecting rod 50 is rotatably connected to the inner side of the outer cylinder 41 by means of the pin, and an unfolding mounting platform 411 is provided below the outer cylinder 41 corresponding to the second rotating seat hole, and a mounting edge 500 is provided on one side of the rotating connecting rod 50 close to one end of the first rotating seat hole. When the rotating connecting rod 50 is rotated outward to be unfolded, the mounting edge 500 is mounted on the unfolding mounting platform 411. A folding mounting platform 412 is provided on the outer cylinder 41, and when the rotating connecting rod 50 is rotated inward to be folded, as shown in FIG. Figure 3 In the middle state, the rotating connecting rod 50 is placed on the folding placing platform 412; at the same time, a positioning hole 414 is opened on the outer tube 41 above the folding placing platform 412, and a top ball screw 52 is fixed to the rotating connecting rod 50, and the top ball on the top ball screw 52 is embedded in the positioning hole 414. In this example, the top ball screw 52 can be any common top ball screw 52 on the market, and its main working principle is that a compression spring is arranged inside the screw, and the compression spring pushes the top ball so that a part of it protrudes from the end of the screw, thereby providing a certain resistance; when the applied force is greater than the elastic force of the compression spring, the compression spring retracts, and the top ball loses its obstruction effect; a common similar structure such as spring jumping beans can also be used.

[0052] The implementation principle of this embodiment is: when the footrest is to be used, the support arm 3 is first rotated from the bottom of the seat cushion to a horizontal position, that is, in the use state, such as Figure 1 The user can put the rotating connecting rod 50 on the unfolding platform 411, press the positioning piece 42, and slide the outer tube 41 out, so that the user can step on the pedal 51 after sitting on the cushion, and the calf and thigh can have better blood circulation with the upper trunk after being supported; when the pedal is not in use, first put the rotating connecting rod 50 on the folding platform 412, hold the screw 52 with the positioning hole 414, and then press the positioning piece 42 to slide the outer tube 41 back, and then rotate the support arm 3 to the bottom of the cushion, that is, the folding state, so that the pedal is folded under the cushion. The pedal is more comfortable when in use, and it is also more convenient to fold after use, which is very beneficial to the health of people who sit for a long time.

[0053] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A footrest for an ergonomic chair, characterized in that: The invention comprises a fixing seat (1) fixed to the lower part of the chair seat cushion, a support arm (3), an angle adjustment seat (2) installed in the fixing seat (1) for adjusting the support arm (3) to be in a use state or a folded state, a sliding assembly (4) slidably connected to the support arm (3) for extending the length of the support arm (3), and a pedal (5) fixed to the sliding assembly (4) for supporting a human foot; The fixing seat (1) is fixedly connected to a limiting cylinder (13); an arc-shaped protrusion (130) protrudes from the limiting cylinder (13), and the arc-shaped protrusion (130) cooperates with the inner wall of the limiting cylinder (13) to form at least two arc-shaped embedded grooves (131); the angle adjustment seat (2) comprises a rotating shaft (20), and the middle part of the rotating shaft (20) passes through the limiting cylinder (13); a clamping ring (21) is provided on the rotating shaft (20), and an arc-shaped embedded plate (210) is axially protruding from the clamping ring (21), the outer diameter of the clamping ring (21) is adapted to the inner diameter of the limiting cylinder (13), and the arc-shaped embedded plate (210) is adapted to any one of the arc-shaped embedded grooves (131); the support arm (3) is fixedly connected to the end of the rotating shaft (20); The clamping ring (21) is slidably connected to the rotating shaft (20); a strip-shaped clearance hole (200) is opened in the middle of the rotating shaft (20); a push rod (22) is slidably connected in the rotating shaft (20), a convex column (220) is fixedly connected to the push rod (22), and the convex column (220) extends out of the clearance hole (200) and is inserted into the clamping ring (21); a telescopic spring (23) is arranged between the support arm (3) and the clamping ring (21); the arc-shaped panel (210) and the telescopic spring (23) are respectively located on both sides of the clamping ring (21); The sliding assembly (4) comprises an inner cylinder (40) sleeved on the support arm (3), an outer cylinder (41) sleeved outside the inner cylinder (40) and fixedly connected to the inner cylinder (40), and a positioning member (42) for positioning the sliding position of the inner cylinder (40) on the support arm (3); The support arm (3) is provided with a strip-shaped adjustment hole (320) in the horizontal direction, and a proximal slot hole (321) is connected to one end of the adjustment hole (320) close to the rotating shaft (20), and a distal slot hole (322) is connected to one end of the adjustment hole (320) away from the rotating shaft (20), and the proximal slot hole (321) and the distal slot hole (322) have the same diameter and are larger than the width of the adjustment hole (320); the positioning member (42) comprises a plug (420) and a trigger rod (421) with one end fixedly connected to the plug (420); the plug (420) The diameter of the plug column (420) is larger than the diameter of the trigger rod (421); the inner cylinder (40) is provided with a first through hole (402) and a second through hole (403) for the plug column (420) and the trigger rod (421) to pass through; the outer cylinder (41) is provided with a mounting hole (413) for the plug column (420) and the trigger rod (421) to pass through; the diameter of the plug column (420) is adapted to the proximal slot hole (321) and the distal slot hole (322), and its diameter is larger than the width of the adjustment hole (320); the diameter of the trigger rod (421) is smaller than the width of the adjustment hole (320).

2. The footrest for an ergonomic chair according to claim 1, characterized in that: A circular end cap is provided at the end of the plug rod (420), the diameter of which is greater than the diameter of the plug rod (420) and is adapted to the mounting hole (413); an outer cover (422) is fixedly connected to the end of the trigger rod (421) away from the plug rod (420), the diameter of which is greater than the diameter of the trigger rod (421) and is adapted to the mounting hole (413).

3. The footrest for an ergonomic chair according to claim 2, characterized in that: A return spring (423) is sleeved on the trigger rod (421) and has one end abutting against the outer cover (422) and the other end abutting against the support arm (3).

4. The footrest for an ergonomic chair according to claim 1, characterized in that: The support arm (3) comprises a connecting rod (30) with one end fixed to the end of the rotating shaft (20), an extension rod (31) with one end fixed to the connecting rod (30), and an I-shaped rod (32) with one end fixed to the other end of the extension rod (31) and an I-shaped cross section; the inner tube (40) comprises a rectangular tube section (400) with a rectangular opening cross section, and an I-shaped tube section (401) coaxial with the rectangular tube section (400) and connected to the rectangular tube section (400) at one end, the inner cavity of the I-shaped tube section (401) being adapted to the cross section of the I-shaped rod (32).

5. The footrest for an ergonomic chair according to claim 1, characterized in that: The pedal member (5) comprises two rotating connecting rods (50) and a pedal (51) fixedly connected between the two rotating connecting rods (50); the rotating connecting rod (50) is rotatably connected to the inner side of the outer cylinder (41); an unfolding and placing platform (411) is provided on the outer cylinder (41); a placing edge (500) is provided on the rotating connecting rod (50) near the unfolding and placing platform (411); when the rotating connecting rod (50) rotates outward and unfolds, the placing edge (500) is placed on the unfolding and placing platform (411).

6. The footrest for an ergonomic chair according to claim 5, characterized in that: A folding platform (412) is provided on the outer cylinder (41). When the rotating connecting rod (50) is rotated and folded inward, the rotating connecting rod (50) is placed on the folding platform (412). At the same time, a positioning hole (414) is opened on the outer cylinder (41) above the folding platform (412). A top ball screw (52) is fixedly connected to the rotating connecting rod (50), and the output end of the top ball screw (52) corresponds to the positioning hole (414).

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