JP2017192519A - Backrest of chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bring a waist part support member into contact with a waist part appropriately even when a seated person applies a load to a backrest or makes a movement to twist the back.SOLUTION: In a backrest 20 having a back frame 21, a face material 22 provided so as to cover the back frame 21, a waist part support member 23 provided to a part behind the face member 22, and a support part 24 for supporting the waist part support member 23, which is connected to a leg part 5 of a chair 10, the back frame 21 includes a pair of flexible side frame parts 31 and 32, and a lower frame part 34 for connecting the lower end parts of the pair of side frame parts 31 and 32, and is connected to the leg part 5 through a lower part of the back frame 21. The support part 24 includes a pair of support arms 51 and 52 that extend upward from the parts corresponding to the right and left end parts of the waist part support member 23 in the lower frame part 34 and support the right and left end parts of the waist part support member 23 respectively.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a backrest of a chair to which a waist support member is attached.

  Conventionally, as a backrest of a chair to which a waist support member is attached, there is one in which a support portion is extended upward from a lower portion of the chair, and a back frame and a waist support member are attached to the support portion. In this backrest, one support portion is extended in the vertical direction at the center portion of the backrest, and a waist support member is supported by the support portion via the center portion (for example, Patent Document 1). reference).

Special table 2008-506486

  In such a chair backrest, when a load is applied to the backrest while a seated person is seated, the resin back frame bends backward, and the waist support member moves in conjunction with the back frame. Therefore, there has been a problem that the waist support member cannot be suitably brought into contact with the waist. In addition, when the seated person moves to twist his back, the waist support member also moves with the backrest in the same manner, so that it is difficult to make the waist support member suitably contact the waist.

  The present invention has been made in view of the above, and even when the seated person makes a load on the backrest or moves to twist the back, the waist support member is preferably brought into contact with the waist. It aims to provide a backrest for a chair that can be made to be.

  In order to solve the above-described problems and achieve the object, the backrest of the chair according to the present invention is a back frame, a face material provided so as to cover the back frame, and a rear side of the face material. In a backrest that includes a waist support member provided at a site and a support portion that supports the waist support member and is connected to a leg portion of a chair, the back frame includes a pair of side frame portions having flexibility. And a lower frame portion that connects the lower end portions of the pair of side frame portions, and is connected to the leg portion via a lower portion of the back frame, and the support portion is the lower frame And a portion extending upward from a portion corresponding to the left and right ends of the waist support member, and having a portion for supporting the left and right ends of the waist support member.

  Further, in the backrest of the chair as described above, the support portion has a pair of support arms extending upward from a portion where a gap is secured between each other in the lower frame portion, The waist support member is characterized in that one of the left and right ends is supported by one of the support arms, and the other of the left and right ends is supported by the other of the support arms.

  According to the present invention, the lower frame portion of the back frame extends upward from the portions corresponding to both end portions of the waist support member, and provided with a support portion having portions that respectively support the left and right end portions of the waist support member, And it is made to connect with a leg part via the lower part of a back frame. Therefore, the position of the lower frame portion does not change greatly even when the seated person puts a load on the backrest or the seated person moves to twist his back. The position of the support member changes relatively, and the waist support member can be suitably brought into contact with the waist.

FIG. 1 is a perspective view of a chair according to an embodiment of the present invention. FIG. 2 is a side view of the chair shown in FIG. FIG. 3 is a cross-sectional view of the chair shown in FIG. FIG. 4 is an enlarged view of a main part of the chair shown in FIG. FIG. 5 is an enlarged view of a main part of the chair shown in FIG. FIG. 6 is a partial side view for explaining the operation of the chair shown in FIG. FIG. 7 is a rear view for explaining the operation of the chair shown in FIG.

  Exemplary embodiments of a chair backrest according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a chair provided with a backrest according to an embodiment of the present invention. The chair 10 illustrated here is applied in a room such as an office, and includes a leg portion 5. The leg 5 includes a leg 3 and a pedestal 4. The leg 3 extends radially from the circumferential surface of the base 2 that forms a cylindrical shape along the vertical direction, and includes the casters 1 at the respective distal ends. The pedestal 4 has a cylindrical shape inserted through the center hole of the base 2 and supports the back frame support 6 at the upper end thereof. The back frame support part 6 comprises the seat part of a chair by providing the cushion 8 on the upper surface. A pair of left and right armrests 7 are attached to the lower surfaces of both sides of the back frame support portion 6. The armrests 7 and 7 protrude upward from the lower surface of the back frame support 6 and then protrude upward. A backrest 20 is connected to the above-described leg portion 5 via the back frame support portion 6.

  As shown in FIGS. 1 to 3, the backrest 20 includes a back frame 21, a face material 22 provided so as to cover the back frame 21, and a waist support member provided at a site on the rear side of the face material 22. 23 and a support portion 24 that supports the waist support member 23.

  The back frame 21 includes a pair of left and right side frame portions 31, 32, an upper frame portion 33, a lower frame portion 34, and a connecting portion 35, and is integrally formed by a flexible synthetic resin. Molded. The side frame portions 31 and 32 are slightly lower in the middle in the vertical direction, and are bent so that the portion corresponding to the height near the waist of the seated person protrudes forward.

  The upper frame portion 33 connects the upper end portions of the pair of side frame portions 31 and 32, and the lower frame portion 34 connects the lower end portions of the pair of side frame portions 31 and 32. The connecting portion 35 extends downward from the lower portion of the lower frame portion 34 and then curves forward, and extends forward on the lower surface of the back frame support portion 6. The backrest 20 is connected to the back frame support portion 6 via the front portion of the connection portion 35.

  The face material 22 is a sheet-like member, and is provided so as to cover the inside of the frame surrounded by the pair of side frame portions 31, 32, the upper frame portion 33, and the lower frame portion 34.

  As shown in FIGS. 4 and 5, the waist support member 23 includes a support body 41 and a pair of sliding arms 42 and 43 that protrude rearward from the left and right ends of the support body 41. It is molded from a flexible synthetic resin. The support part main body 41 is a part that comes into contact with the waist of the seated person, and has a curved shape along the waist of the seated person. A plurality of slits 44, 44... Are formed in the support body 41 along the left-right direction. The width of the support body 41 is approximately the same as the width of the waist of the seated person, and is smaller than the distance between the pair of side frame portions 31 and 32 in the back frame 21. An operation unit 45 is provided below the support body 41. The operation unit 45 is formed by extending the lower edge portion of the support body 41 toward the rear, and is formed over the entire left and right width of the support body 41. The extended end portion of the operation portion 45 projects rearward from the rear surface of the support portion 24.

  The sliding arms 42 and 43 have a protrusion 46 and a support 47. The protrusion 46 and the support 47 are provided in the vicinity of the left and right ends of the operation unit 45 and protrude inward so as to face each other.

  The support portion 24 includes a pair of support arms 51 and 52 and a support arm connection portion 53. The pair of support arms 51, 52 protrudes upward from a portion corresponding to both ends of the waist support member 23 on the upper surface of the lower frame portion 34, and projects upward. It is provided so as to have a width that is equal to or greater than the width.

  On the pair of support arms 51, 52, engaging portions 54, 54 are arranged along the top and bottom. The engaging portions 54, 54 are engaged with the protrusions 46 and the support portions 47 of the sliding arms 42, 43, and support the waist support member 23 through the sliding arms 42, 43 so as to be movable up and down. Yes.

  A plurality of concave portions 56 are formed in each of the engaging portions 54 and 54. The recesses 56 are configured so that the protrusions 46 of the sliding arms 42 and 43 can be fitted. The waist support member 23 can be positioned in the vertical direction by fitting the projection 46 into any one of the recesses 56 provided in the engagement portions 54, 54.

  The support arm connecting portion 53 is a portion that connects the upper ends of the pair of support arms 51 and 52. An opening 58 is formed in a portion surrounded by the support arm connecting portion 53, the pair of support arms 51 and 52, and the lower frame portion 34. The back surface of the waist support member 23 is exposed to the outside through the opening 58, and the operation portion 45 of the support portion main body 41 can be operated.

  In the chair 10 having the backrest 20 configured as described above, when a load is applied to the backrest while the seated person is seated, the back frame 21 is changed to the side frame portion 31 as shown by a two-dot chain line in FIG. , 32 is bent backward using the lower part of the fulcrum as a fulcrum. However, the position of the lower frame portion 34 provided with the connecting portion 35 hardly changes, and the support portion 24 provided on the lower frame portion 34 does not follow the bending of the side frame portions 31 and 32. . Therefore, the waist support member 23 supported by the support portion 24 is not displaced from the initial position with respect to the side frame portions 31 and 32 to bend, and the waist support member 23 is preferably brought into contact with the waist of the seated person. Will be able to.

  Even when the seated person moves the upper body, the waist support member 23 is supported by the pair of left and right support arms 51 and 52, so that the movement of the waist support member 23 is restricted. As a result, the waist support member 23 can be suitably brought into contact with the waist of the seated person. In addition, the pair of left and right support arms 51 and 52 are spaced apart from each other, and the support body 41 is provided with a plurality of slits 44, 44. When contacting, the waist support member 23 bends in accordance with the shape of the waist between the pair of support arms 51 and 52, so that the waist of the seated person can be softly supported.

  Even if the seated person is seated, the waist support member 23 can be moved up and down by moving the operating portion 45 and the sliding arms 42 and 43 slide on the engaging portions 54 and 54. Therefore, it is possible to adjust. Here, in the above-described chair 10, the operation unit 45 is the lower rear portion of the backrest 20 and is disposed between the support arms 51 and 52, so that as shown by the solid line in FIG. The operator can operate the operation unit 45 with a comfortable posture. That is, in the case of the chair 10 provided on the side frame portions 31 and 32 of the back frame 21, when the seated person tries to operate while sitting, as shown by a two-dot chain line in FIG. In addition, it is necessary to take a posture in which the elbows are greatly raised upwards, which is impossible. On the other hand, according to the above-mentioned chair 10, since the operation part 45 is provided in the site | part which becomes lower in the center part of the backrest 20, it operates without taking the attitude | position which raises a shoulder and an elbow largely upwards. The height adjustment of the waist support member 23 can be easily performed.

  And according to the above-mentioned chair 10, since the operation part 45 is formed so that a lower edge part may be extended over the left-right full width of the support part main body 41, and it may protrude from the support part 24 toward back, It is possible to prevent dust from accumulating in a lower region of the operation unit 45, that is, in an upper surface of the lower frame portion 34 and a gap portion between the lower frame portion 34 and the face material 22.

  In this embodiment, the armrests 7 and 7 are connected only to the back frame support portion 6, but the armrests 7 and 7 may be connected only to the backrest 20. Further, in the present embodiment, the operation unit 45 is formed so as to protrude rearward, but it is not necessarily required to protrude. Moreover, although the operation part 45 is formed over the left-right full width of the waist | hip | lumbar part support member 23, it may be provided only in the center part of the waist | hip | lumbar part support member 23, and may be provided only in both right-and-left both ends.

  Further, in the present embodiment, the support portion 24 is formed to have the same width as the waist support member 23, but may be configured to have a larger width than the waist support member 23.

  Furthermore, in this embodiment, the opening 58 is provided in the support portion 24. However, the opening 58 is not necessarily provided, and may be simply formed in a plate shape.

1 Caster 2 Base 3 Leg 4 Leg 5 Leg 6 Back Frame Support 8 Cushion 10 Chair 20 Back 21 Back Frame 22 Face Material 23 Lumbar Support Member 24 Support 31 and 32 Side Frame 33 Upper Frame 34 Below Frame portion 35 Connecting portion 41 Support portion main bodies 42 and 43 Sliding arm 44 Slit 45 Operation portion 46 Projection portion 47 Supporting portions 51 and 52 Support arm 53 Support arm connecting portion 54 Engaging portion 56 Recess 58 Opening

Claims (2)

A back frame, a face material provided so as to cover the back frame, a waist support member provided at a position on the rear side of the face material, and a support part for supporting the waist support member, In the backrest connected to the legs,
The back frame includes a pair of flexible side frame portions and a lower frame portion connecting lower end portions of the pair of side frame portions, and the leg portions via a lower portion of the back frame. Is connected to
The support portion has a portion that extends upward from a portion corresponding to the left and right end portions of the waist support member in the lower frame portion, and has a portion that respectively supports the left and right end portions of the waist support member. Chair backrest. The support portion has a pair of support arms that extend upward from a portion that secures a gap between each other in the lower frame portion,
2. The chair according to claim 1, wherein the waist support member has one of left and right ends supported by one of the support arms and the other of left and right ends supported by the other of the support arms. Backrest.

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