TW201817345A - Height adjustment structure for backrest of chair enabling a user to easily change the height of the backrest of a chair in which the backrest is mounted by a backrest support body extendedly disposed on the chair body - Google Patents

Abstract

The present invention provides a height adjustment structure for the backrest of a chair, which enables a user to easily change the height of the backrest of a chair in which the backrest is mounted by a backrest support body extendedly disposed on the chair body. The height adjustment structure comprises: plural sections of upper and lower engaging parts (81) formed at a part of the backrest support body (3) which supports the center in the widthwise direction of the lower portion of the backrest (4); engaging parts (82) formed at the lower portion of the backrest (4), which are selectively engaged with the engaging parts (81); an operation part (85) movably provided; a clamping part (91) having a roller member (92) formed on the upper and lower portions of the backrest support body (3) which supports two ends in the widthwise direction of the middle portion of the backrest (4); and a sliding part (93) disposed in the middle portion of the backrest (4), which slides in a state of being clamped by the clamping part (91).

Description

   Height adjustment structure of chair back   

The present invention relates to a chair suitable for office use, and more particularly to a height adjustment structure of a backrest.

Conventionally, a chair has been proposed to be capable of changing the height of a backrest (for example, refer to Patent Documents 1 and 2).

Among them, the one described in Patent Document 1 is a chair in which a backrest is arranged between the left and right back pillars and is fixed to the pillars with screws, and screw insertion holes of the pillars in the upper and lower rows are provided. For those who insert the height position and change the height of the backrest, this method is mostly used for wooden chairs in reading desks.

In addition, the person described in Patent Document 2 is a person who is attached to a rocking chair and is connected to the frame of the base in a reclining manner, and the person who slides the backrest and attaches it freely.

However, in general, the office chair is attached to the back support extended from the chair body, but the office chair is adopted as described in Patent Document 1 in order to be able to change the height of the backrest. This method is difficult for structural and design reasons, and the method described in Patent Document 2 lacks generality because it requires a special backrest support structure.

In order to cope with this situation, although the height of the backrest can be changed by changing the engagement position of the backrest and the backrest support body (refer to patent document 3.), it is not the user who can easily change the height of the backrest.

    [Prior technical literature]         [Patent Literature]    

[Patent Document 1] Japanese Patent Laid-Open No. 2007-75533

[Patent Document 2] Japanese Patent Publication No. 2003-534876

[Patent Document 3] Japanese Patent Laid-Open No. 2016-135412

In view of the problems of the conventional chair mentioned above, the present invention aims to provide a height adjustment structure of the backrest of the chair. The present invention is a chair in which a backrest is attached to a backrest support body extending from the chair body, so that the user can The height of the backrest can be easily changed.

In order to achieve the aforementioned object, the height adjustment structure of the backrest of the chair of the present invention is a height adjustment structure of the backrest of a chair in which a backrest is mounted on a backrest support body extending from the chair body, and is characterized in that the width direction of the lower portion of the backrest is A plurality of upper and lower engaging portions are formed in a portion of the backrest support body in the center portion of the center portion. The lower portion of the backrest is movably provided with an engaging portion that selectively engages the aforementioned engaging portion through an operating portion. A portion of the backrest support body at both ends in the width direction of the middle portion is formed with a clamping portion including a roller member. A sliding portion is provided at the middle portion of the backrest to slide while being held by the clamping portion. .

At this time, the engaging portions of the plurality of stages are formed by recessed portions, and the engaging portions engaged with the recessed portions can be formed by pin members.

Moreover, the said sliding contact part can be provided with the protrusion which slidably contacts the surface of the roller member which opposes a clamping part, and extended in the up-down direction.

The backrest is a pelvic lumbar support member capable of supporting a seated person from the pelvis to the waist, and is provided so as to be able to change a protruding shape toward the front.

The pelvic lumbar support member may be a plate-like member made of a synthetic resin having a thickness of 2 to 4 mm.

According to the height adjustment structure of the backrest of a chair according to the present invention, the backrest support of the center of the width direction of the lower portion supporting the backrest is supported in the height adjustment structure of the backrest of the chair to which the backrest extended from the chair body is mounted. A plurality of upper and lower engaging portions are formed in the body portion. An engaging portion which selectively engages with the engaging portion is movably disposed through the operating portion in the lower portion of the backrest, and is arranged in the width direction of the middle portion supporting the backrest. Clamping portions including roller members are formed above and below portions of the backrest support body at both ends, and a sliding contact portion that slides in a state of being clamped by the clamping portion is provided at a middle portion of the backrest. In a chair in which a backrest support body extending from the chair body is mounted, the user can easily change the height of the backrest by simply operating the operation portion.

In addition, the engaging portions of the plurality of stages are formed by recessed portions, and the engaging portions engaged with the recessed portions are formed by pin members, whereby the structure of the engaging portions can be simply constructed.

In addition, the sliding contact portion can be provided with protrusions that slide in contact with the surface of the roller member facing the member of the nip portion and extend in the vertical direction, thereby reducing sliding resistance when adjusting the height of the backrest.

In addition, the aforementioned backrest is a pelvic lumbar support member that supports the seated person from the pelvis to the waist, and is provided so as to be able to change the protruding shape facing forward, thereby improving the posture stability of the seated person.

In addition, the pelvic lumbar support member is made of a plate-shaped member made of synthetic resin having a thickness of 2 to 4 mm, so that the pelvic lumbar support member has a certain degree of flexibility and can be adapted to various postures of a seated person .

1‧‧‧chair

2‧‧‧chair body

3‧‧‧back support

4‧‧‧back

41‧‧‧Pelvic lumbar support member

5‧‧‧Frame material

6‧‧‧ sheet

7‧‧‧ seat member

8‧‧‧backrest height adjustment mechanism

81‧‧‧ Engagement Department

82‧‧‧ Engagement Department

83‧‧‧Spring

84‧‧‧ operation film

85‧‧‧Operation Department

9‧‧‧backrest height adjustment mechanism

91‧‧‧Clamping section

92‧‧‧roller member

93‧‧‧Sliding Contact Department

94‧‧‧ protrusion

[FIG. 1] FIG. 1 shows an example of a chair using the height adjustment structure of the back of the chair of the present invention, (a) is a front view, (b) is a rear view, and (c) is a right side view.

[Fig. 2] The back support and back of the chair are shown, (a) is an oblique view viewed from the front side, and (b) is a perspective view viewed from the rear side.

[FIG. 3] A schematic longitudinal cross-sectional view of the back support and back of the chair as viewed from the left.

[FIG. 4] A detailed vertical cross-sectional view of the back support and back of the chair as viewed from the right.

[FIG. 5] A detailed perspective view showing the back support of the chair and the lower part of the back viewed from the front side.

[FIG. 6] A detailed perspective view showing the back support of the chair and the lower part of the back viewed from the rear side.

[FIG. 7] A detailed perspective view showing the back support of the chair and the upper part of the back viewed from the front side.

[Fig. 8] shows an example of the backrest of the chair, (a) is a top view, (b) is a front view, (c) is a bottom view, (d) is a right side view, (e) is a left side view, ( f) is a rear view, (g) is a perspective view viewed from above the obliquely rear side, (h) is a perspective view viewed from above the obliquely anterior side, and (i) is a projecting shape of the pelvic lumbar support member facing forward (J) is a longitudinal sectional view of a small state, and a longitudinal sectional view of a state in which the protruding shape of the pelvic lumbar support member toward the front is set to be large.

[Fig. 9] An explanatory view showing a support state of a seated person of the chair.

Hereinafter, the embodiment of the height adjustment structure of the backrest of the chair of this invention is demonstrated based on drawing.

1 to 9 show an example of a chair using a height adjustment structure of a backrest of a chair of the present invention.

This chair 1 is suitable for use by an office user, and the backrest support 3 extended from the chair body 2 is provided with a backrest 4 on which a sheet material 6 is laid on the frame material 5 so as to be able to be raised and lowered.

The chair body 2 is attached to a rigid base seat, and a seat member 7 made of a foamed resin molded body whose outer surface is covered with a sheet material such as cloth is placed.

In addition, in the chair 1 of this embodiment, in order to be able to adjust the height of the backrest 4 for the backrest support 3 extended from the chair body 2, it is attached to the lower portion and the middle portion of the backrest 4 (the middle portion and the upper portion of the backrest support 3). ) The height adjustment mechanisms 8 and 9 of the backrest are respectively provided.

Among them, the height adjustment mechanism 8 of the backrest provided at the lower portion of the backrest 4 (the middle portion of the backrest support body 3) is formed by a plurality of upper and lower segments at the portion of the backrest support body 3 at the center in the width direction of the lower portion of the backrest 4 ( In the present embodiment, the engaging portion 81 is a step 5), and the engaging portion 82 selectively engages with the engaging portion 81 on the lower portion of the frame member 5 of the backrest 4 and is movably provided through the operating portion 85.

Here, a plurality of engaging portions 81 formed in the backrest support 3 are formed of recessed portions, and the engaging portions 82 engaged in the recessed portions are formed of pin members.

Thereby, the structure of the engagement parts 81 and 82 can be comprised easily.

In addition, the engaging portion 82 formed by the pin member is pushed by the spring 83 so as to be engaged with the engaging portion 81 formed by the recessed portion, and the operation portion 85 is operated to pass through the operation piece. 84. Against the urging force of the spring 83, the engaging portion 82 formed by the pin member is detached from the engaging portion 81 formed by the recessed portion, and can be selectively engaged with other engaging portions 81.

In addition, the height adjustment mechanism 9 of the backrest provided at the middle portion of the backrest 4 (the upper portion of the backrest support body 3) is formed with rollers at portions of the backrest support body 3 that support both ends in the width direction of the middle portion of the backrest 4. The clamping portion 91 of the member 92 is provided at the middle portion of the frame member 5 of the backrest 4 with a sliding contact portion 93 that slides in a state of being clamped by the clamping portion 91.

Here, the sliding contact portion 93 is provided with a projection 94 which is in sliding contact with the surface of the roller member 92 facing the member of the nip 91 and extends in the vertical direction.

Thereby, the sliding resistance when adjusting the height of the backrest 4 can be reduced.

In this way, according to the chair 1 of this embodiment, in a chair in which the backrest 4 is attached to the backrest support 3 extended from the chair body 2, the user can easily change the backrest 4 only by operating the operation portion 85. height.

However, in the chair of this embodiment, as shown in FIGS. 8 to 9, the pelvic lumbar support member 41 that supports the seated person from the pelvis to the waist is provided so as to be able to change the protruding shape facing forward. In the backrest 4.

Here, since the backrest 4 is a structure in which the sheet material 6 is laid on the frame material 5, the seated person can be supported from the pelvis to the waist by the pelvic lumbar support member 41 from the back of the sheet material 6.

The pelvic lumbar support member 41 is made of a synthetic resin-like plate member having a thickness of 2 to 4 mm and having a certain degree of flexibility. The upper and lower sides are respectively fitted into the frame material 5 of the backrest 4. The middle part is slightly lower, and the lower part is selectively embedded in the lower part of the frame material 5 of the backrest 4 to form one of the upper and lower two embedding parts 51 and 52, whereby the pelvic lumbar support member 41 can be oriented The front is bent and protruding for installation.

Here, the upper and lower insert portions 51 and 52 are formed so that the lower insert portion 52 is located further forward than the upper insert portion 51, and thereby the lower part of the pelvic lumbar support member 41 is formed, as shown in FIG. 8. (i) As shown in FIG. 8, the protruding shape facing forward is set to be small, and when it is fitted into the lower insertion portion 52 as shown in FIG. 8 (j), the protruding shape facing forward is set smaller. Is set to larger.

In addition, the backrest 4 is attached so that it can be raised and lowered to the backrest support body 3 extending from the chair body, whereby the pelvic lumbar support member 41 can be positioned at a height suitable for a seated person.

This allows the pelvic lumbar support member 41 to have a certain degree of flexibility, can be adapted to various postures of the seated person, and can improve the stability of the seated person's posture.

In this way, in the chair of this embodiment, as shown in FIG. 9, in addition to supporting the weight of the seated person in the vicinity of the ischial node by the seat member 7, the chair can be supported by the pelvic lumbar support member 41. The seat is supported from the pelvis to the waist, and can improve the posture stability of the seated person.

The height adjustment structure of the backrest of the chair of the present invention has been described above based on the embodiment. However, the present invention is not limited to the structure described in the foregoing embodiment, and the structure can be appropriately changed without departing from the gist of the invention.

    [Industrial possibilities]    

The height adjustment structure of the backrest of the chair of the present invention is a chair in which a backrest is attached to a backrest support body extending from the chair body, so that the user can easily change the height of the backrest, so it is suitable for use other than office chairs In addition, it can be widely used in various chair applications.

Claims (5)

    A height adjustment structure for a backrest of a chair on which a backrest support body extended from a chair body is mounted is characterized in that a plurality of upper and lower cards are formed on a portion of the backrest support body that supports a center portion in a width direction of a lower portion of the backrest. The engaging portion is movably provided through the operation portion in the lower portion of the backrest, and the engaging portion that selectively engages the aforementioned engaging portion is formed at a portion of the backrest support body that supports both ends in the width direction of the middle portion of the backrest. There is a clamping portion including a roller member, and a sliding contact portion that slides in a state of being clamped by the clamping portion is provided at an intermediate portion of the backrest.         The height adjustment structure of the backrest of a chair according to claim 1, wherein the plurality of engaging portions are formed by recesses, and the engaging portions engaged with the recesses are formed by pin members.         The height adjustment structure of the backrest of the chair according to claim 1 or 2, wherein the sliding contact portion is provided with a protrusion that slides in contact with the surface of the roller member facing the member of the holding portion and extends in the vertical direction.         The height adjustment structure of the backrest of a chair according to claim 1 or 2, wherein the backrest is a pelvic lumbar support member that supports the seated person from the pelvis to the waist so that the protruding shape facing forward can be changed. Make settings.         The height adjustment structure of the backrest of the chair according to claim 4, wherein the pelvic lumbar support member is made of a plate-shaped member made of synthetic resin having a thickness of 2 to 4 mm.