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KR-20260067616-A - APPARATUS FOR ROTATING CHAIR BACK AND BACK CHAIR HAVING THE APPARATUS

KR20260067616AKR 20260067616 AKR20260067616 AKR 20260067616AKR-20260067616-A

Abstract

A chair backrest rotation device capable of adjusting tension strength and a chair backrest having the same are disclosed. The chair backrest rotation device comprises a spring body having a cylindrical shape that rotates at least once, a first spring leg connected to one end of the spring body, and a second spring leg connected to the other end of the spring body, wherein the angle between the first spring leg and the second spring leg (hereinafter referred to as the 'spring angle') has an initial angle; a first rotational body connected to one side of either a chair frame supporting a seat or a backrest, and a first rotational body portion including a first spring fixing part formed on one surface of the first rotational body facing the tension spring and fixing the first spring leg; a second rotational body connected to the other side of the chair frame and the backrest and rotatably coupled to the first rotational body, and a second rotational body portion including a second spring fixing part formed on one surface of the second rotational body facing the tension spring and fixing the second spring leg; and a second rotational body portion coupled to the second rotational body and adjusting the spring angle by changing the position of the second spring leg. It includes a tension adjustment unit capable of adjusting the tension strength of the tension spring. Thus, the user can adjust the tension of the backrest by adjusting it through the tension adjustment unit.

Inventors

  • 이영수

Assignees

  • 이영수

Dates

Publication Date
20260513
Application Date
20241106

Claims (11)

  1. A tension spring comprising a spring body having a cylindrical shape after rotating at least once, a first spring leg connected to one end of the spring body, and a second spring leg connected to the other end of the spring body, wherein the angle between the first spring leg and the second spring leg (hereinafter referred to as the 'spring angle') has an initial angle; A first rotating body part comprising a first rotating body connected to one side of either a chair frame supporting a seat plate or a backrest, and a first spring fixing part formed on one surface of the first rotating body facing the tension spring and fixing the first spring leg; A second rotating body part comprising a second rotating body connected to one side of the other of the chair frame and the backrest and rotatably coupled to the first rotating body, and a second spring fixing part formed on one surface of the second rotating body facing the tension spring and fixing the second spring leg; and A chair backrest rotation device comprising a tension adjustment unit coupled to the second rotation body and capable of adjusting the tension strength of the tension spring by changing the position of the second spring leg to adjust the spring angle.
  2. In paragraph 1, The above second spring fixing part It includes a spring leg receiving groove formed on one surface of the second rotating body and capable of receiving at least a portion of the second spring leg, and The width of the above spring leg receiving groove is The position of the second spring leg is formed to a size that can be changed, and The above tension adjustment part A chair backrest rotation device characterized by having at least a portion disposed in the spring leg receiving groove and being able to change the position of the second spring leg by pushing the second spring leg.
  3. In paragraph 2, The above second rotating body A tension adjustment groove connected to the above-mentioned spring leg receiving groove is formed, and The above tension adjustment part A chair backrest rotation device characterized by including a tension adjustment screw that penetrates the tension adjustment groove and contacts the second spring leg, and when rotated in one direction, moves inward into the tension adjustment groove to push the second spring leg and change the position of the second spring leg.
  4. In paragraph 3, The above tension spring is A chair backrest swivel device characterized by including a torsion spring.
  5. In paragraph 4, On one side of the first rotating body above A first spring body groove is formed to accommodate a part of the spring body, and On one side of the second rotating body mentioned above A chair backrest rotation device characterized by having a second spring body groove formed to accommodate another part of the spring body.
  6. In paragraph 5, In the first spring body groove above A first rotational shaft portion is formed that is accommodated within the above spring body, and In the above second spring body groove A chair backrest rotation device characterized by a second rotation shaft portion accommodated within the spring body being formed at a position corresponding to the first rotation shaft portion.
  7. In paragraph 6, A chair backrest rotation device characterized by further including a rotation shaft coupling screw that penetrates either of the first rotation shaft portion and the second rotation shaft portion in a rotatable state and is screw-coupled to either of the first rotation shaft portion and the second rotation shaft portion.
  8. In paragraph 3, The first rotating body part above It further includes a first rotation limiting portion formed on one surface of the first rotational body facing the second rotational body, and The above second rotating body part A chair backrest rotation device characterized by further including a second rotation limiting part formed on one surface of the second rotational body facing the first rotational body and coupled with the first rotation limiting part to limit the first rotational body to rotate only at a reference angle with respect to the second rotational body.
  9. In paragraph 8, Any one of the first rotation limiting part and the second rotation limiting part is It includes a rotation receiving groove, The other one of the first rotation limiting part and the second rotation limiting part is A chair backrest rotation device characterized by including a rotation projection that is movable within the rotation receiving groove, at least a portion of which is inserted into the rotation receiving groove, and which allows the first rotation body to rotate relative to the second rotation body.
  10. In paragraph 3, Any one of the first rotating body and the second rotating body A chair backrest rotation device characterized by being coupled such that at least a portion of the first rotational body and the other of the second rotational body is inserted to enable rotation.
  11. A seat where any person can sit; Chair frame supporting the above seat plate; A backrest capable of supporting the back of the person when the person is sitting on the seat; and It includes a chair backrest rotation device connecting one side of the chair frame and one side of the backrest, and The above chair backrest rotation device A tension spring comprising a spring body having a cylindrical shape after rotating at least once, a first spring leg connected to one end of the spring body, and a second spring leg connected to the other end of the spring body, wherein the angle between the first spring leg and the second spring leg (hereinafter referred to as the 'spring angle') has an initial angle; A first rotating body part comprising a first rotating body connected to one side of either the chair frame or the backrest, and a first spring fixing part formed on one surface of the first rotating body facing the tension spring and fixing the first spring leg; A second rotating body part comprising a second rotating body connected to one side of the other of the chair frame and the backrest and rotatably coupled to the first rotating body, and a second spring fixing part formed on one surface of the second rotating body facing the tension spring and fixing the second spring leg; and A chair backrest rotation device comprising a tension adjustment unit coupled to the second rotation body and capable of adjusting the tension strength of the tension spring by changing the position of the second spring leg to adjust the spring angle.

Description

Chair backrest swivel device and backrest chair having the same {APPARATUS FOR ROTATING CHAIR BACK AND BACK CHAIR HAVING THE APPARATUS} The present invention relates to a chair backrest rotation device and a chair backrest having the same, and more specifically, to a chair backrest rotation device that enables the chair backrest to rotate and a chair backrest having the same. A chair is a device used for a person to sit on. A typical chair consists of a seat on which a person sits, a chair frame that supports the seat, and a backrest connected to the chair frame to support the person's back. Here, the backrest may be fixed to the chair frame so as not to rotate, but it may also be connected to the chair frame so that the backrest can rotate at a certain angle. In order for the backrest to rotate at a certain angle, a chair backrest rotation device must be provided. The chair backrest rotation device is positioned between the backrest and the chair frame and is equipped with a spring inside to provide tension of a certain strength to the backrest. That is, when a person pushes the backrest with their back after sitting on the chair, the backrest can rotate clockwise, and when the force pushing with the back is reduced or removed, the tension provided by the spring acts to rotate the backrest counterclockwise. Meanwhile, the chair backrest rotation device is equipped with a single spring and operates with a single tension strength. That is, the chair backrest equipped with the chair backrest rotation device provides a single tension strength to the backrest regardless of who sits on it. However, the tension strength felt may vary depending on the person's physique, and the tension strength preferred by each person may differ. Therefore, the spring tension of the chair backrest rotation device needs to be adjusted. FIG. 1 is a perspective view illustrating a backrest chair according to one embodiment of the present invention. FIG. 2 is an exploded perspective view showing an enlarged view of the chair backrest rotation device of FIG. 1. FIG. 3 is an exploded perspective view showing only the chair backrest rotation device of FIG. 2 in enlarged view. Figure 4 is an exploded perspective view showing the chair backrest rotation device of Figure 3 at a different angle. Figure 5 is a side view illustrating the state in which the backrest is rotated in the backrest chair of Figure 1. Figure 6 is a conceptual diagram illustrating the change in the tension spring in the backrest chair of Figure 5. FIG. 7 is a partially cutaway perspective view illustrating the lowest tension strength of the chair backrest rotation device when the backrest of FIG. 5 is in the initial rotation position. FIG. 8 is a partially cutaway perspective view showing the maximum tension strength of the chair backrest rotation device when the backrest of FIG. 5 is in the initial rotation position. FIG. 9 is a conceptual diagram showing only the tension spring according to FIG. 7 and FIG. 8 in the chair backrest rotation device of FIG. 5. FIG. 10 is an exploded perspective view to explain that the chair backrest rotation device of FIG. 1 has a different connection relationship than FIG. 2. The present invention is capable of various modifications and may take various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the invention, the first component may be named the second component, and similarly, the second component may be named the first component. The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to indicate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings. FIG. 1 is a perspective view illustrating a backrest chair according to one embodiment of the present invention. Referring to FIG. 1, the backrest chair according to the present embodiment includes a seat pla