Chair with variable inclination of the seat plate

Abstract

This invention, through simple operation, allows the seat of a chair to tilt in a 360° series of changes. This allows the pelvis and spine to dynamically rotate with the seat's tilt even when seated, thus preventing "chair-related illnesses" common in office workers who spend long hours sitting and reducing fatigue. As a solution to the above problems, this invention comprises a chair with a seat that can rotate freely on a lower support. The seat is separated into a lower support plate and an upper support plate, with an eccentric rotating plate driven by a motor positioned between them. A thrust bearing is installed between the upper and lower support plates and the eccentric rotating plate, allowing the eccentric rotating disc between the upper and lower support plates to rotate freely. The upper part of the eccentric rotating plate has an inclined circular protrusion. When the eccentric rotating plate rotates, the tilt angle of the inclined circular protrusion causes the upper support plate to tilt sequentially in a 360° series when stationary.

Description

Technical Field

[0001] This invention allows the seat of a chair to gradually change 360° in a tilted state through simple operation. This allows the pelvis or spine to dynamically twist with the tilted seat, even when the chair is in use. As a result, it can not only prevent "chair sickness" caused by sitting in a chair for long periods of time in the workplace, but also reduce fatigue. Background Technology

[0002] Typically, chairs used in offices and other similar settings consist of a seat and a lower support structure that supports the seat. Commonly used chairs with backrests consist of a seat that supports the buttocks and a backrest that supports the user's back.

[0003] As described above, in order to comfortably support the user's back, the chair with the backrest can be equipped with a tilting device at the seat that allows the backrest to rotate in the front-to-back direction of the chair. In addition, it can also be equipped with functions to adjust the seat height or adjust the angle in the front-to-back direction.

[0004] In addition, once the height or angle of the chair is set, it will remain in the set state. If it is changed, it needs to be reset. Generally, office workers need to sit for long periods of time.

[0005] As mentioned above, prolonged sitting at work often leads to what is known as "chair disease," a term referring to illnesses caused by the habit of sitting for extended periods. Symptoms include lumbar disc herniation, lower back pain, turtle neck syndrome, circulatory disorders, and carpal tunnel syndrome.

[0006] As a way to prevent "chair sickness," you can prevent and overcome it by minimizing the time spent sitting, frequently moving your body or relaxing your body with simple stretches at fixed times, and frequently changing your sitting posture.

[0007] However, it is actually difficult for people who work in clerical positions to carry out the above preventive activities.

[0008] A review of existing technologies related to chair angle adjustment reveals Korean Patent No. 10-0872907 "Chair with Adjustable Seat and Backrest Angles" (Patent Document 1), Korean Patent No. 10-2222629 "Chair Seat Angle Adjustment Device" (Patent Document 2), and Korean Patent No. 10-2596301 "Chair Seat Angle Adjustment Device" (Patent Document 3), among others.

[0009] A review of the technical content of the aforementioned patent document 1 reveals that it relates to the field of chairs, and more specifically, to a chair with an adjustable seat and backrest angle. Not only the user's back but also the angle of the seat can be adjusted arbitrarily, thereby improving the convenience of use. Instead of using an auxiliary backrest, it directly uses the backrest to support the user's back, thus the structure is relatively simple. Since a gas cylinder is used instead of a spring, the sitting feel is relatively softer.

[0010] In addition, a review of the technical content of Patent Document 2 reveals that it relates to a seat angle adjustment device for a chair, which allows the seat of the chair to rotate and be adjusted according to the seat angle preferred by the chair user. When the chair user is working, the back can be straightened and stretched out, and when resting, the seat angle can be comfortably adjusted according to the user's resting posture, so that the chair user can enjoy a comfortable rest without the lower body slipping.

[0011] A review of the technical content of Patent Document 3 reveals that it relates to a seat angle adjustment device. By setting up a separately equipped angle adjustment device (located between the lower support body and the seat of various chairs), the seat can be adjusted to various angles in a horizontal state through the angle adjustment device. This allows the seat to be changed and maintained at the optimal angle or quickly restored to a horizontal state according to the usage mode or purpose of the chair.

[0012] In the chairs disclosed in Patent Documents 1 to 3, the angle of the seat can only be adjusted in the front-to-back direction, and once the angle is set, it remains unchanged. Therefore, for users who work while sitting in the chair, since they cannot initiate physical activity through the chair, there is a problem that it cannot help prevent "chair sickness" and the like. Summary of the Invention

[0013] Technical problems to be solved This invention allows the chair seat to tilt in a 360° series of changes through simple operation. This allows the pelvis or spine to dynamically rotate with the tilt of the seat while sitting, thus preventing "chair sickness" caused by long hours of sitting in a chair and reducing fatigue.

[0014] Technical solution To solve the above problems, the present invention provides a chair in which the seat is rotatably mounted on a lower support. The seat is separated into a lower support plate and an upper support plate, and an eccentric rotating plate is rotatably mounted between the two via a motor. A thrust bearing is provided between the upper and lower support plates and the eccentric rotating plate, allowing the eccentric rotating disc mounted between the upper and lower support plates to rotate freely. An inclined circular protrusion is formed on the upper part of the eccentric rotating plate. When the eccentric rotating plate rotates, the inclined angle of the inclined circular protrusion causes the upper support plate to tilt sequentially in a 360° range when stationary.

[0015] Beneficial effects This invention provides a chair with a seat that is freely rotatable on a lower support. The seat is separated into a lower support plate and an upper support plate, with an eccentric rotating plate rotatably mounted between them via a motor. A thrust bearing is installed between the upper and lower support plates and the eccentric rotating plate, allowing the eccentric rotating plate to rotate freely. The upper part of the eccentric rotating plate has an inclined circular protrusion. When the eccentric rotating plate rotates, the upper support plate, in a stationary state, changes only its tilt angle 360° sequentially due to the tilt angle of the inclined circular protrusion. Even when sitting in the chair, the pelvis or spine can dynamically twist with the tilt of the seat. This not only prevents "chair sickness" caused by prolonged sitting in office work but also reduces fatigue. Attached Figure Description

[0016] Figure 1 : A side cross-sectional view of the chair of the present invention; Figure 2 : Figure 1 In this state, the eccentric rotating plate rotates 180°, causing the seat to tilt backward. Figure 3 : Figure 1 Enlarged cross-sectional diagram of the key components; Figure 4 : Figure 2 Enlarged cross-sectional diagram of the key components; Figure 5 : Figure 3 Decomposition state diagram; Figure 6 : Plan view of the components of this invention; Figure 7 : A plan view of the upper support plate of the present invention; Figure 8 : A diagram showing the connection structure of the upper and lower support plates of this invention; Figure 9 : A plan view of the eccentric rotating operating plate of the present invention; Figure 10 : Cross-sectional view of the eccentric rotating plate of the present invention; Figure 11 : A diagram showing the bottom surface configuration of the eccentric rotating operating plate of the present invention; Figure 12 : A plan view of the lower support plate of the present invention; Figure 13 : Cross-sectional view of the lower support plate of the present invention; Figure 14 : An exploded side view of the chair frame of the present invention; Figure 15 : Front view of the chair frame of the present invention.

[0017] Explanation of reference numerals in the attached figures 10—Chair 20—Lower Support 21—Leg support axis 22—Leg 23—Fixed bracket 24—Lifting shaft 30—Seat board; 40—Upper support plate 41—Seat cushion 42—Bearing retainer 43—Spherical bearing; 44—Fixing shaft 45—Fastening nut; 50—Lower support plate 51—Fastening hole; 52—Bearing groove 53—Protrusion 54—Bolt 55—Nut 56—Rotating Gear 57—Lower thrust bearing; 60—Eccentric rotating plate 61—Shaft bearing; 62—Inclined circular protrusion 62-1—lower part 62-2—higher part 63—Bearing groove; 64—Guide groove 65—Upper thrust bearing; 66—Internal meshing gear 67—Outer peripheral surface 68—Detection protrusion 69—Limit switch 70—Chair frame 71—Seat frame; 72—Backrest frame 73—Backplate 73-1—Auxiliary Backplate 74—Auxiliary backplate frame; 75—Inner connecting bearing 76—Outer connecting bearing; 77—Connecting plate 90—Connecting rod; 91—Fixing plate 92—Connecting bolt; 93—Fixing nut 94—Spherical bearing Detailed Implementation Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0018] The present invention relates to a chair 10, wherein the seat 30 is rotatably assembled on the lower support body 20. In particular, when the seat 30 is stationary, the upper support plate 40 changes the tilt angle sequentially along the 360° direction. When sitting on the seat 30, the pelvis or spine dynamically twists with the tilt, thereby not only preventing the "chair disease" that office workers worry about when sitting on the chair 10 for long periods of time, but also reducing fatigue.

[0019] The lower support body 20 constituting the chair 10 of the present invention is configured such that: the legs 22 are formed radially toward the side of the leg support shaft 21, and a lifting shaft 24 is rotatably assembled at the leg support shaft 21. A fixed bracket 23 is fixedly provided at the lifting shaft 24, which is no different from that of an ordinary chair.

[0020] In this invention, the seat 30 assembled on the lower support 20 of the chair 10 tilts sequentially in a 360° direction as operated by the user.

[0021] The seat 30 is constructed as follows.

[0022] The seat 30 includes an upper support plate 40 with a seat cushion 41, an eccentric rotating plate 60, and a lower support plate 50. The following describes its structure and assembly in more detail.

[0023] The lower support plate 50 rotatably fixes the seat 30 to the lower support body 20, and at the same time, it fastens the chair frame 70 to its bottom surface. The chair frame 70 includes a seat frame 71 and a back frame 72.

[0024] The lower support plate 50 has the same shape as the seat plate 30, forming a rectangle. It is made of steel plate by stamping. A fastening hole 51 is drilled at the eccentric position in the center. A bearing groove 52 protrusion 53 is formed at a certain distance from the fastening hole 51. A sliding rod bracket 81 is assembled and fixed on one side.

[0025] A sliding rod 80 is movably provided at the sliding rod bracket 81, a connecting bearing 82 is provided at one end, and a horizontally assembled guide bearing 83 is provided at the other end.

[0026] The lower support plate 50 is fastened to the fixed bracket 23 formed at the upper end of the lifting shaft 24 by bolts 54 and nuts 55. The reduction motor M is fixedly installed on one side of the bottom surface. After the shaft of the reduction motor M protrudes towards the upper part of the lower support plate 50, the running gear 56 is assembled and fixed.

[0027] In addition, a lower thrust bearing 57 is provided at the bearing groove 52 formed in the protrusion 53.

[0028] The eccentric rotating plate 60 assembled on the upper part of the lower support plate 50 is configured as follows.

[0029] Figures 9 to 11 This is a plan view, a cross-sectional view, and a bottom view of the eccentric rotating plate 60. A shaft bearing 61 is installed at the center of the eccentric rotating plate 60. Centered on the shaft bearing 61, an inclined circular protrusion 62 with a bearing groove 63 is formed at a certain distance. Figure 10 As shown, the inclined circular protrusion 62 includes a lower part 62-1 and a higher part 62-2.

[0030] Additionally, a guide groove 64 is formed on the outer side of the inclined circular protrusion 62, such as... Figure 9 and Figure 10 As shown, the guide groove 64 is eccentrically formed from the shaft bearing 61. The guide groove 64 located at the high part 62-2 of the inclined circular protrusion 62 is in contact with the inclined circular protrusion 62 and is located close to the shaft bearing 61, while the guide groove 64 located at the low part 62-1 of the inclined circular protrusion 62 is in contact with the outer peripheral surface 67 of the eccentric rotating plate 60 and is located away from the shaft bearing 61.

[0031] At this time, the guide bearing 83 of the sliding rod 80, which is located on the lower support plate 50, is inserted into the guide groove 64. When the eccentric rotating plate 60 is rotated, the sliding rod 80 located on the sliding rod bracket 81 moves forward and backward by inserting the guide bearing 83 into the guide groove 64.

[0032] In addition, the upper thrust bearing 64 is located in the bearing groove 63 formed in the inclined circular protrusion 62, and an internal meshing gear 66 is formed at the bottom edge of the eccentric rotating plate 60 to engage with the running gear 56 formed in the lower support plate 50. A detection protrusion 68 is formed on one side of the outer peripheral surface 67 of the eccentric rotating plate 60, and the operation of the geared motor M is controlled by operating the limit switch 69 located on one side.

[0033] The upper support plate 40 located on the upper part of the eccentric rotating plate 60 has a bearing holding part 42 in the center. The spherical bearing 43 formed on the upper end of the fastening shaft 44 is inserted and assembled in the bearing holding part 42. After the fastening shaft 44 passes through the shaft bearing 61 of the eccentric rotating plate 60, it is fastened by the fastening nut 45. A cushion 41 is provided on the upper part of the upper support plate 40.

[0034] Although the seat cushion 41 can also be fixedly mounted on the upper support plate 40, the seat cushion 41 can also be easily and detachably mounted on the upper support plate 40 using methods such as Velcro, so that it can be easily replaced according to the user's preferences or the season.

[0035] like Figure 15 As shown, an auxiliary back panel frame 74, on the inner side of the back panel frame 72 constituting the chair frame 70, is connected to an auxiliary back panel 73. The connection method is as follows: the inner connecting bearing 75 constituting the back panel frame 72 and the outer connecting bearing 76 constituting the outer side of the auxiliary back panel frame 74 are connected by a connecting piece 77. The connecting bearing 82 constituting the end of the sliding rod 80 is assembled at the lower end of the auxiliary back panel frame 74. By the back-and-forth movement of the sliding rod 80, the inner and outer connecting bearings 75 and 76 of the auxiliary back panel 73-1 constituting the upper end of the auxiliary back panel frame 74 are moved forward axially, and then reset, thereby positioning them side by side with the back panel 73 constituting the back panel frame 72.

[0036] like Figure 8 As shown, fixing plates 91 are fixedly installed on the front side of the bottom of the upper support plate 40 and the rear side of the top of the lower support plate 50. Connecting bolts 92 are inserted into the fixing plates 91. The connecting bolts 92 are movably connected to the connecting rod 90 through the ball bearing 94 and then tightened by the fixing nut 93. Corrugated covers 94 are provided on the outer peripheral surfaces of the upper and lower support plates 40 and 50 to visually cover the interior.

[0037] In implementing the invention, the operation of the geared motor M used to rotate the eccentric rotating plate 60 is realized in the control box. The geared motor M alternates between forward and reverse rotation, and the operation time can be arbitrarily set by a timer. When getting up from the chair 10 during operation, the operation of the geared motor M can be stopped by electrical settings, etc.

[0038] The main technology of the invention is that when the eccentric rotating plate 60 is rotated by the geared motor M, the inclination of the seat plate 30 tilts in sequence at 360°, so that the user's pelvis or spine can be dynamically twisted with the inclination of the seat plate 30.

[0039] The chair 10 of the present invention, constructed in this way, serves the same purpose as a regular office chair, and there is no difference in this respect.

[0040] However, the chair 10 of the present invention differs from the conventional chair in that, when the reduction motor M is turned on during long hours of sitting at work, the eccentric rotating plate 60, which is engaged with the internal meshing gear 66, rotates around the fastening shaft 44 as the axis.

[0041] At this time, the lower support plate 50 is securely fixed to the fixed bracket 23 of the lower support body 20, and the upper support plate 40 is as follows: Figure 8 As shown, it is connected to the lower support plate 50 via a connecting rod 90.

[0042] In addition, the lower thrust bearing 57 and the upper thrust bearing 65 are located between the lower support plate 50 and the eccentric rotating plate 60, and between the eccentric rotating plate 60 and the upper support plate 40. Therefore, even when the positions of the upper and lower support plates 40 and 50 are fixed, the operation of the eccentric rotating plate 60 is not a problem.

[0043] Therefore, when the state of chair 10 is as follows Figure 1 As shown, when the high part 62-2 of the inclined circular protrusion 62 of the eccentric rotating plate 60 is located on the rear side of the seat plate 30, that is, on the guide bearing 83 part of the sliding rod 80, and the low part 62-1 is located on the front side, when the geared motor M is running, the eccentric rotating plate 60 rotates clockwise around the fastening shaft 44.

[0044] At this time, the eccentric rotating plate 60 is as follows Figure 9 As shown, the high part 62-2 is located behind the seat 30, at the 3 o'clock position, while the low part 62-1 is located in front of the seat 30, at the 9 o'clock position, and the seat 30 remains almost horizontal.

[0045] Meanwhile, the guide bearing 83 of the sliding rod 80 connected to the lower end of the auxiliary back plate frame 74 is located at the shortest position from the center of the fastening shaft 44 (at the guide groove 64 formed at the high part 62-2), and the auxiliary back plate 73-1 formed at the upper end of the auxiliary back plate frame 74 is positioned side by side with the back plate 73 of the back plate frame 72.

[0046] In the above state, when the eccentric rotating plate 60 rotates so that the high part 62-2 is at the 6 o'clock position, the low part 62-1 is at the 12 o'clock position. Therefore, when sitting on the chair 10, the left side of the seat plate 30 is positioned high and the right side is positioned low, causing the pelvis and spine to rotate to the right.

[0047] At this time, the guide bearing 83 of the sliding rod 80 connected to the lower end of the auxiliary back panel frame 74 is pushed backward by the guide groove 64 which is slightly farther away from the fastening shaft 44. Therefore, the auxiliary back panel 73-1 of the auxiliary back panel frame 74 moves inward compared to the back panel 73, thereby applying pressure to the user's back.

[0048] When the eccentric rotating plate 60 rotates so that the high part of the inclined circular protrusion 62 is at the 9 o'clock position, as Figure 2 As shown, the lower part 62-1 is located at the 3 o'clock position. Therefore, the front side of the seat board 30 is positioned higher and the back side is lower, causing the pelvis and spine to rotate backward.

[0049] Meanwhile, the guide bearing 83 of the sliding rod 80 connected to the lower end of the auxiliary back plate frame 74 is located at the guide groove 64 (lower part 62-1) positioned furthest from the center of the fastening shaft 44, so the sliding rod 80 is as Figure 2 Reverse as shown.

[0050] As described above, when the sliding rod 80 moves backward, the auxiliary back plate frame 74 connected to it uses the inner and outer connecting bearings 75 and 76 and the connecting piece 77 as fulcrums to move the auxiliary back plate 73-1 forward, thereby pushing the user's waist and applying pressure, thus achieving the effect of acupressure on the spine.

[0051] Furthermore, when the eccentric rotating plate 60 is rotated so that the high part 62-2 of the inclined circular protrusion 62 is in the 12 o'clock position and the low part 62-1 is in the 6 o'clock position, the left side of the seat plate 30 is positioned low and the right side is positioned high when sitting on the chair 10, causing the pelvis and spine to rotate to the left.

[0052] In the above state, when the eccentric rotating plate 60 rotates to make the high part 62-2 as described above... Figure 9 As shown, when it is back at the 3 o'clock position, the eccentric rotating plate 60 has rotated 360° and returned to its original position. Figure 1 As shown, the seat 30 remains almost horizontal.

[0053] As described above, when the eccentric rotating plate 60, which is engaged with the rotating gear 56, rotates slowly through the operation of the geared motor M, the high part 62-2 and the low part 62-1, which are located at the inclined circular protrusion 62, rotate simultaneously, causing the inclination of the seat plate 30 to deform and the user's pelvis and spine to rotate dynamically. This can be expected to prevent "chair sickness" caused by sitting on the chair 10 for long periods of time.

[0054] When the eccentric rotating plate 60 rotates, the high part 62-2 of the inclined circular protrusion 62 reaches... Figure 9 When the device is at the 3 o'clock position, the detection protrusion 68 on one side touches the limit switch 69. At this time, the rotation of the geared motor M temporarily stops, and then reverses, causing the eccentric rotating plate 60 to rotate in the opposite direction of clockwise, and repeatedly perform 360° counterclockwise rotation.

[0055] As described above, the operating time of the geared motor M that makes the eccentric rotating plate 60 rotate in both directions can be arbitrarily adjusted by setting the control box C.

[0056] In addition, an upper thrust bearing 65 and a lower thrust bearing 57 are provided between the upper and lower support plates 40 and 50 and the eccentric rotating plate 60. Therefore, even when the positions of the upper and lower support plates 40 and 50 are fixed, the rotation of the eccentric rotating plate 60 is not a problem.

[0057] The lower support plate 50 is fixedly installed at the fixed bracket 23 of the lower support body 20, such as... Figure 8 As shown, the upper and lower support plates 40 and 50 are connected by connecting rods 90 and spherical bearings 94. The spherical bearings 94 are assembled at the fixing pieces 91 of the upper and lower support plates 40 and 50, and are slightly spaced along the left and right directions. Therefore, there is no problem in connecting and supporting the fixed lower support plate 50 and the upper support plate 40 with varying inclination through the connecting rods 90.

[0058] The upper and lower support plates 40 and 50 are provided with corrugated covers 94 at their edges, so even if the inclination of the seat plate 30 changes, there is no problem in use. The seat cushion 41, which is part of the seat plate 30, can be easily removed from the upper support plate 40 by means of Velcro or other methods, so it can be easily replaced according to preference and convenience, which is very convenient.

Claims

1. A chair with a variable seat inclination, characterized in that, In a chair configuration where the seat, which is attached to a chair frame, is rotatably mounted on a lower support body, a lower support plate (50) is fixedly mounted on a fixed bracket (23) of the lower support body (20). A bearing groove (52) is formed on the lower support plate (50), and a lower thrust bearing (57) is provided at the bearing groove (52). A geared motor (M) is provided on one side of the lower end of the lower support plate (50), and a gear (56) formed on the geared motor (M) protrudes from the upper side of the lower support plate (50). An eccentric rotating plate (60) is mounted on the lower support plate (50), and an internal meshing gear (66) is provided on the bottom surface of the eccentric rotating plate (60) and engages with the gear (56) of the geared motor (M). The eccentric rotating plate (60) is configured with a lower part (62-1) and a higher part (62-1). 2) An inclined circular protrusion (62) is formed on the inclined circular protrusion (62), and an upper thrust bearing (65) is provided on the bearing groove (63). An upper support plate (40) with a cushion (41) is provided on the eccentric rotating plate (60). A fastening shaft (44) for inserting a spherical bearing (43) is formed at the center of the upper support plate (40). After the fastening shaft (44) passes through the eccentric rotating plate (60) and the lower support plate (50), it is fastened by a fastening nut (45). Thus, the eccentric rotating plate (60) is rotatably provided between the upper and lower support plates (40) (50). When the eccentric rotating plate (60) rotates, the inclination of the upper support plate (40) changes through the inclined circular protrusion (62) including the lower part (62-1) and the higher part (62-2).

2. The chair with variable seat inclination according to claim 1, characterized in that, A guide groove (64) is formed on the outer side of the inclined circular protrusion (62) of the eccentric rotating plate (60). The guide groove (64) is formed eccentrically from the center of the eccentric rotating plate (60) through which the fastening shaft (44) passes. Compared with the high part (62-2) side of the circular inclined protrusion (62), the guide groove (64) located at the low part (62-1) is positioned further away from the center.

3. The chair with variable seat inclination according to claim 1, characterized in that, A chair frame (70), including a seat frame (71) and a backrest frame (72), is fixedly mounted on the bottom surface of a lower support plate (50). An auxiliary backrest frame (74) is positioned between the backrest frames (72). Then, an inner connecting bearing (75) formed in the backrest frame (72) and an outer connecting frame (76) formed in the auxiliary backrest frame (74) are connected by a connecting piece (77). At the lower end of the auxiliary backrest frame (74), a movably connected... A sliding rod (80) is provided on one side of the lower support plate (50), and a guide bearing (83) is provided at the end of the sliding rod (80). The guide bearing (83) is inserted into the guide groove (64) formed in the eccentric rotating plate (60). When the eccentric rotating plate (60) rotates, the sliding rod (80) moves forward and backward through the eccentrically formed guide groove (64), and at the same time, the auxiliary back plate (73-1) of the auxiliary back plate frame (74) moves forward and backward.

4. The chair with variable seat inclination according to claim 1, characterized in that, Fixing plates (91) are fixedly installed at the upper support plate (40) and the lower support plate (50), and connecting bolts (92) are installed at the fixing plates (91). Connecting rods (90) are connected to the connecting bolts (92), and connecting bolts (92) and connecting rods (90) are assembled by ball bearings (94).

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