Swing lever pushback seat

Abstract

The utility model discloses a swing rod pushes back seat, including base, the seat board is fixed on the base, the lower extreme of seat board is fixed with the backrest component, the backrest component includes the connecting support of being connected in seat board below, the lower extreme of connecting support is fixed with the support pipe, the lateral surface of support pipe is hinged with the swing rod, the lower extreme of swing rod is hinged with the push rod through the pin shaft, the lower extreme of support pipe is connected with spring mounting seat, the spring of spring mounting seat and the upper end of swing rod is connected between, the other end of push rod is connected with the backrest casing, the backrest casing is also hinged on the end face of support pipe, the inboard of backrest casing is connected with the backrest connecting seat, the other end of backrest connecting seat is connected with the backrest, the utility model discloses through the driving force of spring's tension, makes the backrest forward inclination, sticks in the back of user, through the pressure of back to backrest, overcomes the tension of spring, makes the backrest angle of adjustment with the sitting posture of human body.

Description

Technical Field

[0001] This utility model relates to the field of study chair technology, specifically a rocker arm push-back chair. Background Technology

[0002] Existing children's posture correction chairs can generally adjust the backrest position to fit the child's back and reduce pressure on the back and waist. They can also adjust the seat height to meet the needs of children of different heights. For example, the backrest adjustment mechanism provided by patent CN222955158U, in which the backrest is inserted into the positioning groove by a positioning member, the backrest adjustment is stepped adjustment, the backrest position positioning cannot meet the needs of all sizes, therefore, this rocker backrest seat is designed so that the backrest can be steplessly adjusted to meet the needs of different backrest positions, and at the same time, the pressure of the sitting posture makes the backrest move backward to achieve adaptive adjustment of the backrest. Utility Model Content

[0003] The purpose of this utility model is to provide a rocker arm backrest seat, which uses the tension of a spring to provide driving force, causing the backrest to tilt forward and fit against the user's back. In use, the pressure of the back against the backrest overcomes the tension of the spring, allowing the backrest to adjust its angle according to the user's sitting posture, thus achieving self-adjustment of the backrest.

[0004] This utility model provides the following technical solution: a swing-arm push-back seat, including a base, a seat plate fixed on the base, a backrest assembly fixed at the lower end of the seat plate, the backrest assembly including a connecting bracket connected to the lower part of the seat plate, a support tube fixed at the lower end of the connecting bracket, a swing arm hinged to the side of the support tube, a push rod hinged to the lower end of the swing arm via a pin, a spring mounting seat connected to the lower end of the support tube, a spring connected between the spring mounting seat and the upper end of the swing arm, a backrest housing connected to the other end of the push rod, the backrest housing also hinged to the end face of the support tube, a backrest connecting seat connected to the inner side of the backrest housing, a backrest connecting seat connected to the other end of the backrest connecting seat, the swing arm swings forward under the action of the spring, causing the push rod to move backward, pushing the backrest housing to swing forward around the hinge point, so that the backrest is pressed tightly against the back.

[0005] Furthermore, a backrest positioning assembly is provided inside the backrest. The backrest positioning assembly includes a positioning plate, a positioning pressure plate, and an eccentric wheel. The positioning plate is fixed on the support tube. The eccentric wheel is rotatably connected to the backrest housing through a rotating shaft. A knob is connected to the outside of the rotating shaft. The positioning pressure plate is located below the eccentric wheel. When the eccentric wheel faces downward, it presses the positioning pressure plate down and engages with the positioning plate, thus positioning the backrest housing. The orientation of the eccentric wheel is adjusted by rotating the rotating shaft. The downward pressure of the eccentric wheel on the positioning pressure plate causes the positioning pressure plate to engage with the positioning plate, thereby positioning the angle of the backrest housing and the front-back position of the backrest.

[0006] Furthermore, an arc-shaped rack is formed on the surface of the positioning plate, and a toothed part that meshes with the rack is formed at the lower end of the positioning pressure plate. Both the rack and the toothed part are ratchet teeth. The ratchet teeth ensure the stability of the positioning and prevent the back shell from shifting at an angle under the pressure of the back.

[0007] Furthermore, a backrest seat is hinged inside the backrest housing via a pin, with the pin located at the top of the backrest seat. A backrest rod is also hinged to the upper end of the backrest seat, and the lower end of the backrest rod is hinged to the support tube. The backrest rod swings together with the backrest housing. By rotating the backrest housing, the angle of the backrest rod is adjusted, causing the backrest rod to drive the backrest seat to rotate, thereby adjusting the orientation angle of the backrest.

[0008] Furthermore, both sides of the rear seat and the rear housing are hinged with the same handle, which allows the seat position to be moved.

[0009] Furthermore, a backrest height adjustment assembly is fixed inside the backrest seat. The backrest height adjustment assembly includes a screw and an adjustment block. The screw rotates inside the backrest seat, and the adjustment block is threaded onto the screw. The adjustment block moves up and down inside the backrest seat. The backrest connecting seat is connected to the outside of the adjustment block, and the backrest is connected to the other side of the backrest connecting seat. By rotating the handle, the screw rotates, further controlling the height of the adjustment block and adjusting the height of the backrest connecting seat and the backrest.

[0010] Compared with the prior art, the beneficial effects achieved by this utility model are: (1) The driving force is provided by the tension of the spring, so that the backrest tilts forward and fits against the user's back. When in use, the pressure of the back against the backrest overcomes the tension of the spring, so that the backrest adjusts its angle according to the sitting posture of the human body, thus realizing the adaptive adjustment of the backrest position. (2) By rotating the knob, adjust the height of the eccentric wheel, press the positioning plate onto the positioning plate, fix the angle of the backrest shell, further fix the position of the backrest, reduce the pressure on the back, and when used again, there is no need to adjust the angle of the backrest. (3) By rotating the handle, control the height of the adjusting block, and further adjust the height of the backrest connecting seat and the backrest so that the backrest fits against the back. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a perspective view of the overall structure of this utility model; Figure 2 This is a three-dimensional view of the interior of the back shell of this utility model; Figure 3 This is a cross-sectional view of the present invention; In the diagram: 1. Base; 2. Seat panel; 3. Connecting bracket; 4. Backrest assembly; 41. Support tube; 42. Swing rod; 43. Push rod; 44. Spring; 45. Spring mounting seat; 46. Backrest rod; 47. Backrest housing; 5. Backrest positioning assembly; 51. Knob; 52. Positioning plate; 53. Eccentric wheel; 54. Positioning pressure plate; 6. Backrest height adjustment assembly; 61. Rotating handle; 62. Screw; 63. Adjusting block; 64. Backrest seat; 65. Backrest connecting seat; 66. Backrest. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Please see Figures 1 to 3This utility model provides a technical solution: a rocker arm push-back seat, including a base 1, a seat plate 2 fixed on the base 1, a push-back assembly 4 fixed at the lower end of the seat plate 2, the push-back assembly 4 including a connecting bracket 3 bolted to the lower part of the seat plate 2, a support tube 41 bolted to the lower end of the connecting bracket 3, the support tube 41 being horizontally placed, a rocker arm 42 hinged to the side of the support tube 41, the center of the rocker arm 42 being rotatably connected to the side of the support tube 41 via a pin, the rocker arm 42 being bent, a push rod 43 hinged to the lower end of the rocker arm 42 via a pin, the push rod 43 being horizontally set, a spring mounting seat 45 connected to the lower end of the support tube 41, a spring 44 connected between the spring mounting seat 45 and the upper end of the rocker arm 42, the spring 44 being activated when the seat is not in use. When in a stretched state, the tension generated by the spring 44 pulls the swing rod 42 to rotate inward, pushing the push rod 43 outward. The other end of the push rod 43 is hinged to the backrest housing 47, which is also hinged to the end face of the support tube 41. The push rod 43 drives the lower end of the backrest housing 47 to move outward, causing the backrest housing 47 to rotate around the hinge point with the support tube 41, further causing the upper end of the backrest housing 47 to tilt forward. The inner side of the backrest housing 47 is connected to the backrest connecting seat 65, and the other end of the backrest connecting seat 65 is connected to the backrest 66. The swing rod 42 swings forward under the action of the spring 44, causing the push rod 43 to move backward, pushing the backrest housing 47 to swing forward around the hinge point, so that the backrest 66 is pressed tightly against the back, providing support for the back.

[0014] like Figure 2 and 3 As shown, a backrest positioning assembly 5 is provided inside the backrest 66. The backrest positioning assembly 5 includes a positioning plate 52, a positioning pressure plate 54, and an eccentric wheel 53. The positioning plate 52 is fixed on the support tube 41. The eccentric wheel 53 is rotatably connected to the backrest housing 47 via a rotating shaft. The rotating shaft passes through the backrest housing 47 and the eccentric wheel 53 and can rotate. Knobs 51 are fixed at both ends of the rotating shaft. The positioning pressure plate 54 is located below the eccentric wheel 53. The height of the eccentric wheel 53 is adjusted by rotating the knob 51. When the eccentric wheel 53 faces downward, it presses down the positioning pressure plate 54 to engage with the positioning plate 52, positioning the positioning pressure plate 54 and ensuring the tilt angle of the positioning pressure plate 54. This further positions the backrest housing 47, fixing the position of the backrest 66 and avoiding the need to readjust the position when the user leaves the seat and uses it again.

[0015] The positioning plate 52 has an arc-shaped rack formed on its surface, and the lower end of the positioning pressure plate 54 has a toothed part that meshes with the rack. Both the rack and the toothed part are ratchet teeth. By setting ratchet teeth, the positioning strength between the positioning plate 52 and the positioning pressure plate 54 is ensured, the slippage phenomenon is prevented, and the stability of the angle positioning of the backrest 66 is further ensured.

[0016] Inside the backrest housing 47, a backrest seat 64 is hinged via a pin. The pin is located at the top of the backrest seat 64. A backrest rod 46 is also hinged to the upper end of the backrest seat 64. The lower end of the backrest rod 46 is hinged to the support tube 41. The backrest rod 46 swings together with the backrest housing 47, adjusting the front and back position of the backrest 66. The backrest housing 47 swings, further driving the backrest rod 46 to swing, causing the backrest seat 64 to rotate around the top pin. When the backrest rod 46 swings forward, it pushes the backrest seat 64 to swing forward around the pin, further allowing the backrest 66 to adjust its angle and fit against the user's back.

[0017] Both sides of the rear seat 64 and the rear housing 47 are hinged with the same handle, which makes it easy to move the seat and adjust its position.

[0018] like Figure 2 and 3 As shown, a positioning backrest height adjustment component 6 is fixed inside the backrest seat 64. The positioning backrest height adjustment component 6 includes a screw 62 and an adjustment block 63. The screw 62 rotates inside the backrest seat 64. A rotating handle 61 is connected to the screw 62. The adjustment block 63 is threadedly connected to the screw 62. The rotation of the rotating handle 61 controls the up and down movement of the adjustment block 63 inside the backrest seat 64. The backrest connecting seat 65 is connected to the outside of the adjustment block 63. The backrest 66 is connected to the other side of the backrest connecting seat 65, further adjusting the height of the backrest connecting seat 65 and the backrest 66 so that the backrest 66 can fit against the user's back, conforming to ergonomics.

[0019] Usage process: Before use, under the tension of the spring, the swing arm rotates forward, further pushing the push rod to move backward, causing the lower end of the back shell to move backward, so that the back shell swings forward on the support tube. When using it, lean your body against the backrest and use the support of your back to overcome the tension of the spring and change the angle of the backrest. After adjusting your posture, rotate the knob to make the eccentric wheel face down and press the positioning plate on the positioning plate to fix the angle of the backrest shell and further fix the position of the backrest so that the angle of the backrest can meet the user's needs. At the same time, there is no need to adjust the backrest angle when using it again. By rotating the handle, the height of the adjustment block can be controlled, and the height of the backrest connector and the backrest can be further adjusted so that the backrest fits against the user's back.

[0020] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rocker-arm push-back seat, including a base, characterized in that: A seat plate is fixed to the base, and a backrest assembly is fixed to the lower end of the seat plate. The backrest assembly includes a connecting bracket connected to the lower part of the seat plate, a support tube fixed to the lower end of the connecting bracket, a swing rod hinged to the side of the support tube, a push rod hinged to the lower end of the swing rod via a pin, a spring mounting seat connected to the lower end of the support tube, a spring connected between the spring mounting seat and the upper end of the swing rod, a backrest housing connected to the other end of the push rod, the backrest housing also hinged to the end face of the support tube, a backrest connecting seat connected to the inner side of the backrest housing, and a backrest connected to the other end of the backrest connecting seat. The swing rod swings forward under the action of the spring, causing the push rod to move backward, pushing the backrest housing to swing forward around the hinge point, so that the backrest is pressed tightly against the back.

2. The rocker arm push-back seat according to claim 1, characterized in that: The backrest is equipped with a backrest positioning assembly, which includes a positioning plate, a positioning pressure plate, and an eccentric wheel. The positioning plate is fixed on the support tube, and the eccentric wheel is rotatably connected to the backrest housing through a rotating shaft. A knob is connected to the outside of the rotating shaft. The positioning pressure plate is located below the eccentric wheel. When the eccentric wheel faces downward, it presses down the positioning pressure plate to engage with the positioning plate, thereby positioning the backrest housing.

3. The rocker arm push-back seat according to claim 2, characterized in that: The positioning plate has an arc-shaped toothed rack formed on its surface, and the lower end of the positioning pressure plate has a toothed portion that meshes with the toothed rack. Both the toothed rack and the toothed portion are ratchet teeth.

4. The rocker arm push-back seat according to claim 1, characterized in that: The back-chasing housing is hinged to a back-chasing seat by a pin, with the pin located at the top of the back-chasing seat. The upper end of the back-chasing seat is also hinged to a back-chasing rod, and the lower end of the back-chasing rod is hinged to a support tube. The back-chasing rod swings together with the back-chasing housing.

5. The rocker arm push-back seat according to claim 4, characterized in that: Both sides of the back-mounted base and the back-mounted housing are hinged with the same handle.

6. The rocker arm push-back seat according to claim 4, characterized in that: The backrest seat is fixed with a backrest height adjustment component, which includes a screw and an adjustment block. The screw rotates inside the backrest seat, and the adjustment block is threaded onto the screw. The adjustment block moves up and down inside the backrest seat. The backrest connecting seat is connected to the outside of the adjustment block, and the backrest is connected to the other side of the backrest connecting seat.

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