JP3149244U - Adjustment structure for chair backrest - Google Patents

Abstract

The present invention provides an adjustment structure capable of adjusting a chair back rest assembled to a seat according to a user's required angle orientation by a simple operation. An outer tooth portion 231 of a shaft center 23 is rotated when a pressing portion 26 fitted in an axial center portion close to the outside of a main body 21 is pushed inward with respect to an adjustment unit 2 for a chair backrest. In order to remove the restriction of the internal teeth 225 of the type back pad 22, the rotary back pad 22 can be in a free state and can be adjusted at any angle, and after releasing the pressing part 26 and resetting, the axis 23 When the elastic element 24 fitted on one side is supported outward, the outer tooth portion 231 of the shaft center 23 is again regulated by the inner tooth portion 225 of the rotary backrest, and the rotary backrest 22 is It exhibits a gentle positioning state. [Selection] Figure 1

Description

  The present invention provides an adjustment structure for a chair backrest, and achieves an adjustment according to a user's required angular orientation by a simple operation with respect to a chair backrest mainly assembled on a seat.

  Therefore, the various functional chairs that have been developed by the industry right now can be used by users of different consumption needs and methods, all of which are planned seat cushions, backrests and armrest units. Can be equipped with a mechanism that matches ergonomics (ergonomics), so that the user can get the planned comfort after the user sits in the chair.

  Regarding the adjustment of the backrest, the author published a utility model of “Improved Seat Structure” of Taiwan Patent Certificate No. M308020 to apply for a patent and grant a patent previously. An adjustment operation of the angle of the scheduled chair backrest can be achieved, but the distance that the chair backrest contacts the user's body is very finite, and therefore the utility of the planned comfort degree cannot be obtained.

  The present invention is based on the above, and is constructed by laying and assembling a backrest for a chair having the same properties and having a comfortable feel on the back, and by creating another new form of design, the user can When performing backrest adjustments, it is possible to complete convenient and quick movements, that is, to complete the adjustment of the scheduled angle orientation, and as a result, the user can sit on the chair and attach it completely to the chair backrest. , Ergonomics and comfortable utility can be obtained.

  The main purpose of the present invention is to provide an adjustment unit for a chair backrest assembled at the rear of the butterfly seat of the seat, but it takes an axis with external teeth and rotates with the main body. The elastic element is inserted into one side of the shaft center, and the lid is locked onto the main body by the screw fixing element. In order to remove the restriction of the inner teeth of the rotary backrest, the outer teeth of the shaft center when the pressing part is fitted inward at the axial center point close to the outside. In addition, the rotary backrest is free to adjust any angle, and after releasing the presser and resetting, the elastic element fitted on one side of the shaft center is supported outward. Again, the outer teeth of the shaft center are regulated by the inner teeth of the rotary backrest, and the rotary backrest It presents a gentle positioning state.

  As shown in FIGS. 1 and 2, the chair backrest adjustment structure designed by the present invention is a chair backrest adjustment unit assembled mainly behind the butterfly seat (1) of the seat. 2) from the main body (21), the rotary backrest (22), the shaft center (23), the elastic element (24), the lid body (25), the pressing part (26) and the screw fixing element (27, 28). Composed in combination.

  The bottom surface of the main body (21) has a flat shape, and a chip opening space (211) is formed on one side of the main body (21) close to the rear, followed by a locking portion ( 212), an inner hole (213) is opened, and holes (214, 215) for locking in the screw fixing elements (27, 28) are opened on the other side of the main body (21).

  One end of the rotary backrest (22) is formed with a connection step portion (221) having a concave ring tank (222), and adhesive portions (223) are provided on both sides of the connection step portion (221). In addition, an inner hole (224) having an inner tooth portion (225) is formed in the connection step portion (221), and the position restriction portions (226, 226) are respectively provided along both the upper and lower positions of the connection step portion (221). 227) is formed, and then a shaft attachment hole (228) is provided at the other end of the rotary backrest (22) for use in the shaft attachment of the chair backrest (3).

  The shaft center (23) is formed with an external tooth portion (231) corresponding to the internal tooth portion (224) of the rotary backrest (22) on one side thereof, and a fitting step portion having a shape on each side. (232, 233) are formed (there is a demand for non-circular modeling, where a rectangle is considered to be implemented).

  The lid body (25) is established according to the outer shape of the main body (21), a locking portion (251) is formed on one side, and an inner hole (252) is opened between them, and the lid body (25) is formed. Holes (253, 524) are opened on the outside of the side.

  Assembling (see FIGS. 1 and 4), the shaft center (23) is first inserted between the main body (21) and the inner hole (224) of the rotary backrest (23), and the elastic element. (24) is fitted on one side of the shaft center (23), and the lid (25) is locked onto the main body by the screw fixing elements (27, 28), and finally the main body (21) A pressing part (26) is fitted in the axial center (23) portion that lies close to the outside, and then the chair backrest (3) for modeling is placed between the shaft mounting holes (228) of the rotary backrest (22). Attached to

  When the angle adjustment is performed (see FIGS. 3 and 5), when the user presses the holding portion (26) inward, the outer tooth portion (231) of the shaft center (23) is not attached to the rotary backrest (22). In order to remove the restriction of the internal tooth portion (225), the rotary backrest (22) is in a free state (for example, FIG. 5 and FIG. 6), and can be adjusted at any angle. 26) After releasing and resetting, the elastic element (24) fitted on one side of the shaft center (23) is supported outwardly, so that the external tooth portion (231) of the shaft center (23) is again formed. Adjustment of the chair backrest is subject to regulation of the internal teeth (225) of the rotary backrest (22), and the rotary backrest (22) exhibits a mild positioning condition (eg, FIGS. 4 and 7). Besides using the unit (2) to adjust the angle, the rotary backrest (22) can be attached to the shaft. The angle of the backrest (3) for the chair that is pivotally mounted between (228) can also be adjusted (for example, FIG. 7), and is completely affixed to the backrest for chair (3) when the user sits in the chair By achieving it so that it can be done, it matches the comfort of ergonomics.

  The adjusted angular width of the rotary backrest (22) of the present invention is restricted by the position restricting portions (226, 227) formed by both the upper and lower positions of the connection step portion (221), and the maximum forward limit thereof. The position restricting portion (226) is attached to the front surface (216) of the front side of the main body (21) (for example, FIG. 8), and the maximum limit in the rearward direction is the position restricting portion (227) of the main body (21). It is attached to the wall surface (217) of the cutout space (211) (for example, FIG. 9) and the design of the position restricting portions (226, 227) is used, and the angle adjustment is too small to sit down. This prevents the situation where the adjustment of the angle and the angle is too large and causes danger.

  Furthermore, in the present invention, a tank hole (218) communicating with the hole (214) can be opened below the main body (21), and the metal coupling part (29) having the screw hole (291) is inserted. This increases the degree of lock-in coupling, but is referenced as shown in FIG.

  Furthermore, since an elastic washer (20) can be fitted between the rotary backrest (23) and the main body (21), the degree of adhesion between the two members is increased. And the washer (20) may be an elastic material such as rubber, EVA, PVC,.

It is a disassembled perspective view of the member of the adjustment unit of the back support for chairs of this invention. It is the isometric view schematic diagram which the adjustment unit of the back support for chairs of this invention and the butterfly seat couple | bonded. It is a schematic diagram of the left side of the adjustment unit of the back support for chairs of this invention. It is a schematic diagram of the AA cross section of FIG. It is a cross-sectional schematic diagram of operation | movement of the adjustment unit of the backrest for chairs of this invention. It is the schematic diagram of the left side which the adjustment unit of the back support for chairs of this invention combined with the back support for chairs. It is a left schematic diagram of operation | movement of the adjustment unit of the backrest for chairs of this invention. FIG. 8 is an enlarged detailed view of a portion B in FIG. 7. FIG. 8 is an enlarged detailed view of a portion C in FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Butterfly seat 2 Chair backrest adjustment unit 3 Chair backrest 20 Washer 21 Main body 22 Rotating backrest 23 Axis center 24 Elastic element 25 Cover body 26 Holding part 27, 28 Screwing fixing element 29 Metal coupling part 211 Notch space 212, 251 Locking part 213, 224, 252 Inner hole 214, 215, 253, 524 Hole 216 Surface layer surface 217 Wall surface 218 Tank hole 221 Connection step part 222 Concave ring tank 223 Pasting part 225 Internal tooth part 226, 227 Position restriction portion 228 Shaft hole 231 External tooth portion 232, 233 Insertion step portion 291 Screw hole

Claims (5)

The chair backrest adjustment structure includes a structure that is assembled to the rear of the butterfly seat of the seat and adjusts the angle with respect to the chair backrest. The shaft centering portion is taken and inserted between the main body and the inner hole of the connecting step portion of the rotary backrest, and the elastic element is fitted on one side of the shaft center, and then the screw fixing element The lid is locked onto the main body by the above, and the pressing portion is fitted in the axial center portion that lies close to the outside of the main body, so that when the pressing portion is pushed inward, the outer tooth portion of the shaft center In order to remove the restriction of the internal teeth of the rotary backrest, the rotary backrest is free and can adjust any angle. Since the elastic element fitted on the side is supported outwardly, the outer tooth portion of the shaft center again becomes the rotary back. Inner toothing regulated by the, and adjusting the structure of the backrest for a chair, characterized in that the rotary seat back is in the one that exhibits a mild positioning of Te. 2. The upper and lower positions of the connection step portion of the rotary backrest can each be formed with a position restricting portion to prevent a situation where the angle adjustment is too small or too large. Adjustment structure for chair backs. 2. A tank hole communicating with the hole can be opened below the main body, and the degree of lock-in coupling is increased by providing a metal coupling portion having a screw hole. Adjustment structure of the back support for chairs described in 1. 2. The chair backrest adjustment structure according to claim 1, wherein an adhesion degree between both members is increased by fitting an elastic washer between the rotary backrest and the main body. . The adjusting structure of the chair backrest according to claim 1, wherein the fitting step formed by both sides of the shaft center is a non-circular shaped design.

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