JP2014184324A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair which has strong support power by improving support rigidity of both of a back board and a backrest frame and also has comfortable sitting feeling as if a sitting person is enwrapped from the right and left sides.SOLUTION: A back board 3 includes a frame part 4 in which both right and left sides and both upper and lower ends have high rigidity, and a flexible part 5 which is formed in an inward part surrounded by the frame part 4 and can elastically deform by being provided with multiple openings. An engaging part 9 is integrally projected rearward in both right and left sides of the frame part 4, and a locking part 8 provided in the right and left sides of a backrest frame 2 is engaged to the engaging part 9 mutually rotatably around an axis in the vertical direction, so that the back board 3 is supported by a front surface of the backrest frame 2.

Description

  The present invention relates to a chair in which a back plate made of a hard elastic body such as a synthetic resin is supported on the front surface of a backrest frame extending upward from the rear portion of a seat body.

  A chair in which a back plate made of a hard elastic body is attached to the front surface of a backrest frame is known from Patent Document 1, for example.

JP 2001-128785 A

In the invention described in Patent Document 1, a long hole in the vertical direction is formed in the upper part of the back plate, and this long hole is engaged with a projecting shaft provided in the upper part of the backrest frame to move in the vertical direction. A holding piece provided with a left and right fitting groove that opens upward in an arc shape at the lower part of the backrest frame, and protrudes forward. In the corresponding position, a left and right bulged portion that is press-fitted into the fitting groove from above is provided, and the back plate is supported by the backrest frame.
As a result, the back plate can be bent backward. However, in this back plate, bending that wraps the seated person from the left and right sides cannot be obtained.
The back plate is entirely made of hard elastic material, and its left and right sides are supported by the left and right vertical rods of the support frame. Is difficult to elastically deform.

  The present invention improves the support rigidity of both the back plate and the backrest frame to obtain a strong support force, and the back plate can be effectively elastically deformed rearward by a backward load by the seated person's back. It is an object of the present invention to provide a chair that can provide a comfortable sitting comfort.

According to the present invention, the above-described problem is solved as follows, as described in each of the claims.
(1) In a chair comprising a back frame extending upward from the rear part of the seat body and a back plate supported on the front side by the back frame, the back plate has left and right side portions and upper and lower ends. A frame part having high rigidity, and a flexible part that is formed inwardly surrounded by the frame part and is elastically deformable by providing a large number of openings. On the rear surface, an engaging part is integrally projected rearward, and the engaging part provided on both sides of the backrest frame can be relatively rotated around the vertical axis on this engaging part. The back plate is supported by the front surface of the backrest frame.

With such a configuration, since the engaging portions are integrally protruded rearward on the rear surfaces of the left and right sides of the frame portion with high rigidity in the back plate, the backrest in the frame portion with high rigidity is provided. The thickness of the support portion to the frame is increased, and the rigidity of the portion is further increased. Therefore, the support rigidity to the backrest frame on both the left and right sides of the back plate is improved, and a strong support force can be obtained. Can be elastically deformed.
In addition, the frame part that is highly rigid with respect to the flexible part is less likely to be elastically deformed, and the left and right side parts of the frame part of the back plate can be rotated around the vertical axis at the support part to the backrest frame. Because of the support, it is easy to displace the left and right sides of the back plate due to the backward load from the back of the seated person, and the desired shape of flexion that bulges backward in a plan view is obtained. Comfortable sitting comfort is obtained.

(2) In the above item (1), the engaging portions provided on the left and right side portions of the frame portion are cylindrical bodies facing the vertical direction with the upper surface closed.

  With such a configuration, the rigidity of the engaging portion that is a cylindrical body and the rigidity of the frame portion at that portion are increased.

(3) In the above item (2), an engaging portion provided on the backrest frame so as to face the tubular body is provided on the tubular body protruding in front of the backrest frame in the vertical direction. The protrusion is fitted so as to be rotatable around the axis.

  With such a configuration, the back plate is easily supported by preventing the downward movement by the front surface of the back frame simply by fitting the cylindrical body to the protrusion provided on the back frame. be able to.

(4) In the above item (3), the protrusion is a shaft portion that faces in the vertical direction.

  With such a configuration, the back plate can be easily supported by the front surface of the backrest frame with a simple operation of dropping the cylindrical body from above and fitting it into the shaft portion of the backrest frame. .

(5) In any of the above items (1) to (4), the backrest frame includes a pair of left and right vertical frames facing the rear surfaces of the left and right sides of the frame, and is locked to the front surfaces of both vertical frames. Provide a part.

  With such a configuration, the back frame can be stably supported by the vertical frame spaced in the left-right direction, and the flexible portion of the back plate can be elastically deformed backward in a wide range.

According to the present invention, since the engaging portions are integrally protruded rearward on the rear surfaces of the left and right sides of the frame portion having high rigidity in the back plate, the backrest frame in the frame portion having high rigidity is provided. The thickness of the support part becomes large, and the rigidity of that part is further increased. Therefore, the support rigidity to the backrest frame on both the left and right sides of the back plate is improved, and a strong support force can be obtained. Can be elastically deformed.
In addition, the frame part that is highly rigid with respect to the flexible part is less likely to be elastically deformed, and the left and right side parts of the frame part of the back plate can be rotated around the vertical axis at the support part to the backrest frame. Because of the support, it is easy to displace the left and right sides of the back plate due to the backward load from the back of the seated person, and the desired shape of flexion that bulges backward in a plan view is obtained. Comfortable sitting comfort is obtained.

It is a side view of the chair which implemented this invention. FIG. 2 is an enlarged end view taken along line II-II in FIG. 1. It is the III-III sectional view taken on the line in FIG. FIG. 4 is an enlarged end view taken along line IV-IV in FIG. 1. It is the VV sectional view taken on the line in FIG. It is a principal part expansion disassembled perspective view in the broken-line circle VI in FIG. Similarly, it is a principal part expansion disassembled perspective view in the broken-line circle VII in FIG. It is an enlarged front view of a back board. It is an enlarged rear view of a back board. It is a figure which shows the procedure which makes a back plate support a backrest frame. It is the XI-XI line end elevation in FIG. Similarly, it is the XII-XII line | wire end view in FIG. Similarly, it is an XIII-XIII line end view in FIG.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a side view of a chair embodying the present invention, FIG. 2 is an enlarged end view taken along line II-II in FIG. 1, FIG. 4 is an enlarged end view taken along line IV-IV in FIG. 1, and FIG. FIG. 9 is an enlarged rear view of the back plate.

  As shown in FIG. 1, in the chair according to the present invention, a back plate 3 made of a hard elastic body such as a synthetic resin is supported on the front surface of a backrest frame 2 extending upward from the rear portion of a seat body 1. .

  As shown in FIG. 8 and FIG. 9, the back plate 3 has a peripheral portion of the back plate 3, that is, left and right side portions and upper and lower end portions as a highly rigid frame portion 4, which is slightly longer than a substantially rectangular frame portion 4. The inner part is a flexible part 5 that is elastically deformed by a backward load from the back of the seated person. The flexible portion 5 is formed so as to be easily elastically deformed by providing a large number of vertically long openings 6 penetrating from the front surface to the rear surface.

  As shown in FIG. 1, the back plate 3 and the backrest frame 2 both have a substantially square shape in side view in which a portion slightly above the lower end is bent so as to protrude forward.

  The back plate 3 is supported on the backrest frame 2 so as to be rotatable about an axis in the vertical direction at the left and right side portions of the bent portion 7 a and the vicinity of the upper end of the frame portion 4.

  3 is a cross-sectional view taken along line III-III in FIG. 2, and FIG. 6 is an enlarged exploded perspective view of a main part in a broken-line circle VI in FIG. As shown in FIGS. 1 to 3 and 6, first locking portions 8 and 8 are provided on the left and right side portions near the upper end of the backrest frame 2, respectively, and the left and right sides near the upper end of the back plate 3. The first engaging portions 9 and 9 are provided in the respective portions, and the first locking portions 8 and 8 are fitted into the first engaging portions 9 and 9 from below so that the back plate 3 is mounted on the back frame. 2 is supported near the upper end.

  As shown in FIG. 6, the first locking portion 8 is formed with a first shaft portion 10 in the vertical direction, and a backrest frame is formed by a vertical support body 11 provided on the rear surface of the first shaft portion 10. The front surface of 2 is projected forward.

  The first engagement portion 9 is formed by closing a part of the upper surface of the cylindrical body 12 in the vertical direction whose one end having a substantially C-shaped cross section opens in a slit shape. The first shaft portion 10 in the first locking portion 8 is fitted in the tubular body 12 in the first engaging portion 9 in a loosely fitted state from below, and the support body 11 is slit-shaped in the tubular body 12. The first shaft portion 10 is fitted so as to be rotatable relative to the cylindrical body 12 around the axis in the vertical direction by being fitted into the inner wall 13.

  5 is a cross-sectional view taken along line VV in FIG. 4, and FIG. 7 is an enlarged exploded perspective view of a main part in a broken line circle VII in FIG.

  As shown in FIGS. 1, 4, 5, and 7, second locking portions 14 and 14 are provided on the left and right sides of the bent portion 7 a of the back plate 3, respectively, and the bent portion of the backrest frame 2 is provided. 2nd engaging parts 15 and 15 are provided in the right-and-left side part in 7b, respectively. The back plate 3 is supported by the backrest frame 2 at the bent portions 7a and 7b by fitting the second engaging portions 14 and 14 into the second engaging portions 15 and 15 from the front.

  As shown in FIG. 7, the second engagement portion 15 is provided with a pair of left and right engagement pieces 16, 16 that are separated from each other by an appropriate distance in the left-right direction, and in the vicinity of the free ends of both engagement pieces 16, 16. The inner surfaces 16a, 16a that face each other are recessed so as to have an arc shape in a plan view.

  The second shaft portion 17 as the second locking portion 14 has an upper plate and a lower plate 19 that are slightly larger than the diameter of the shaft body 18 on the upper and lower surfaces of the shaft body 18 in the vertical direction slightly longer than the engagement piece 16. , 19 is provided.

  The shaft body 18 in the second locking portion 14 is pressed against the opening 20 between the free ends of the pair of engaging pieces 16 and 16 in the second engaging portion 15 from the front, and the opening 20 is expanded by elastic deformation. Thus, the second shaft portion 17 of the second locking portion 14 is relatively rotatable around the vertical axis by being fitted between the opposed inner surfaces 16a, 16a formed in an arc shape in plan view. The second engagement portion 15 is fitted.

  FIG. 10 is a diagram illustrating a procedure for supporting the back plate 3 on the backrest frame 2.

  First, as shown in FIG. 10A and FIG. 6, the back plate 3 is positioned at the upper front of the backrest frame 2, moved downward, and near the upper end of the pair of left and right vertical frames in the backrest frame 2. The first shaft portion 10 of the first locking portion 8 provided on the lower side of the cylindrical body 12 of the first engaging portion 9 provided in the vicinity of the upper end portion of the left and right side portions of the frame portion 4 of the back plate 3 is lowered. 10 (b), and the support body 11 that fixes the first shaft portion 10 to the backrest frame 2 is inserted into the slit-shaped opening 13 in the cylindrical body 12, The state shown in

  Next, as shown in FIGS. 10B and 7, the shaft body 18 of the second locking portion 14 provided in the bent portion 7 a on the left and right side portions of the frame portion 4 of the back plate 3 is attached to the backrest frame. The opening 20 is pressed against the opening 20 between the free ends of the pair of engaging pieces 16, 16 in the second engaging portion 15 provided in the bent portion 7 b of the pair of left and right vertical frames. Is expanded and fitted between the engagement pieces 16 and 16 to obtain the state shown in FIG.

  As a result, the back plate 3 is attached to and supported by the backrest frame 2 with sufficient strength in the vicinity of the upper end portion at the left and right side portions and the four bent portions 7a and 7b.

  In each support portion, the shaft portions 10 and 17 are supported so as to be rotatable around the vertical axis.

  11, FIG. 12, and FIG. 13 are an end view taken along line XI-XI, an end view taken along line XII-XII, and an end view taken along line XIII-XIII in FIG.

  As shown in FIG. 11, in the flexible portion 5 inward of the frame portion 4 in the back plate 3, the thickness in the front-rear direction at the portion above the bent portion 7 a is the center in the left-right direction from the left and right frame portions 4. It gradually becomes larger as you go to.

  As understood by comparing FIG. 11 and FIG. 12, in the flexible portion 5 inward of the frame portion 4 of the back plate 3, the thickness D1 in the front-rear direction of the portion above the bent portion 7a is: It is formed larger than the wall thickness d1 in the bent portion 7a.

  Furthermore, as shown in FIG. 13, the thickness D2 in the front-rear direction at the central portion in the vertical direction of the flexible portion 5 above the bent portion 7a of the back plate 3 is the front-rear direction in the upper and lower outward direction of this central portion. It is formed larger than the wall thickness d2.

  By doing so, excessive bending of the central portion of the flexible portion 5 in the portion above the bending portion 7a of the back plate 3 is prevented, and peripheral portions other than the central portion of the flexible portion 5 are appropriately displaced. Then, as shown by the broken lines in FIGS. 11 and 13, the back plate 3 is obtained that acts to wrap the back of the seated person from the left, right, top and bottom.

  As shown in FIGS. 11 and 12, ribs 21 a and 21 b extending in the vertical direction are provided on the rear surface of the frame portion 4 in the back plate 3. Thereby, the bending rigidity of the up-down direction of the frame part 4 improves, and the back board 3 which has preferable moderate rigidity is obtained.

  As shown in FIGS. 2 and 4, the cross section above the bent portion 7b of the pair of left and right vertical frames 2a and 2a in the backrest frame 2 is formed in a C-shape projecting rearwardly. Between the front surface of the frame 2a and the rear surface of the back plate 3, a bending space 22 is provided so that the flexible portion 5 of the back plate 3 can bend and bend backward due to a backward load by the back of the seated person. Is provided.

  As mentioned above, although typical embodiment was described, for example, between the 1st latching | locking part 8 and the 1st engaging part 9, and the 2nd latching | locking part 14 and the 2nd engaging part 15, a specific form is mentioned. Or the first locking part 8 and the first engaging part 9 or the second locking part 14 and the second engaging part 15 between the backrest frame 2 and the back plate 3. You can also.

DESCRIPTION OF SYMBOLS 1 Seat body 2 Back frame 2a Vertical frame 3 Back board 4 Frame part 5 Flexible part 6 Opening part 7a, 7b Bending part 8 1st latching part 9 1st engaging part 10 1st axial part 11 Support body 12 Cylinder Shaped body 13 Slit-shaped opening 14 Second locking portion 15 Second engagement portion 16 Engagement piece 16a Opposing inner surface 17 Second shaft portion 18 Shaft body 19 Upper plate, lower plate 20 Opening 21a, 21b Rib 22 Deflection space

Claims (5)

In a chair provided with a back frame extending upward from the rear part of the seat body and a back plate supported on the front side by the back frame,
The back plate is formed in a frame portion having high rigidity at both the left and right side portions and both upper and lower end portions, and an inward portion surrounded by the frame portion, and a flexible portion that can be elastically deformed by providing a large number of openings. And
Engaging portions are integrally protruded rearward on the rear surfaces of the left and right side portions of the frame portion, and locking portions provided on both side portions of the backrest frame are provided around the engaging portion around the vertical axis. The chair is characterized in that the back plate is supported by the front surface of the backrest frame by being fitted so as to be relatively rotatable.   2. The chair according to claim 1, wherein the engaging portions provided on the left and right side portions of the frame portion are cylindrical bodies facing upward and downward with the upper surface closed.   A locking portion provided on the backrest frame so as to face the tubular body is fitted to the tubular body so as to be rotatable about an axis in the vertical direction. The chair according to claim 2, wherein the chair is a protruding portion.   The chair according to claim 3, wherein the protruding portion is a shaft portion facing in the up-down direction.   The backrest frame includes a pair of left and right vertical frames facing the rear surfaces of the left and right side portions of the frame portion, and a locking portion is provided on the front surface of both vertical frames. The chair described in.

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