JP2008119220A - Method of attaching back panel in chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of attaching a back panel in a chair, capable of very easily and securely attaching the back panel to a backrest frame and allowing a seated person to feel comfortable as if the seated person were wrapped from left and right sides. <P>SOLUTION: The back panel 3 made of a hard elastic body such as synthetic resin is supported to the front surface of the backrest frame 2 extended upward from the rear of a seat body 1 by engaging a first engagement part 9 disposed in either the back panel 3 or the backrest frame 2 with a first locking part 8 disposed in the other member from above in the vicinity of the upper end in the left or right side of the respective members, and engaging a second locking part 14 disposed in one member with a second engagement part 15 in the other member in the front/rear direction in the lower part in the left or right side after that. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

A method of attaching a back plate made of a hard elastic body to the front surface of a backrest frame is known from Patent Document 1, for example.
In the invention described in this document, 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 so as to move in the vertical direction. A holding piece with a left and right fitting groove that opens upward in the shape of an arc at the lower part of the backrest frame is projected forward and corresponds to the holding piece on the back plate. In this position, a bulging portion in the left-right direction that is press-fitted into the fitting groove from above is provided, and the back plate is supported by the back frame.
As a result, the back plate can be bent backward. However, in this back plate, bending that encloses the seated person from the left and right sides was not obtained.
JP 2001-128785 A

  According to the present invention, the back plate can be attached to the back frame very easily and reliably, and preferably, the right and left side portions of the back plate are appropriately bent by a backward load by the back of the seated person. And it aims at providing the attachment method of the back board in a chair which can obtain comfortable seating comfort that a seated person is wrapped from right and left sides easily.

According to the present invention, the above-described problem is solved as follows, as described in each of the claims.
(1) When a back plate made of a hard elastic body such as a synthetic resin is supported on the front surface of the back frame extending upward from the rear part of the seat body, the back plate and the back frame are placed on both sides In the vicinity of the upper end portion of the side portion, the first engaging portion provided on one side is fitted into the first engaging portion provided on the other side from above, and then the lower portion on the left and right side portions is provided on one side. By fitting the second engagement portion provided on the other side into the two engaging portions from the front and rear direction, the back plate is attached to the chair that supports the back plate on the backrest frame.

  (2) When a back plate made of a hard elastic body such as a synthetic resin is supported on a back frame extending upward from the rear part of the seat body, the back plate and the back frame are attached to the left and right side portions of both. In the lower portion of the second engaging portion, the first engaging portion provided on one side is fitted into the first engaging portion provided on the other side from above, and then the second engaging portion provided on one side in the vicinity of the upper end portion on the left and right side portions. By fitting the second locking portion provided on the other side into the joint portion from the front-rear direction, the back plate is attached to the chair in which the back plate is supported by the backrest frame.

  (3) In the above item (1) or (2), the first locking portion and the first engagement portion, and the second locking portion and the second engagement portion are respectively set around the vertical axis. It is fitted so as to be relatively rotatable.

  (4) In any one of the above items (1) to (3), the first locking portion is formed with a first shaft portion in the vertical direction, and the first shaft portion is supported by a back plate or a backrest by a support. The first engaging portion is fixed to the frame, and is formed by closing at least a part of the upper surface of the cylindrical body in the vertical direction whose one end having a substantially C-shaped cross section opens like a slit. The shaft portion is fitted into the cylindrical body from below, and the support body is fitted into the slit-like opening in the vertical direction of the cylindrical body so that the first engaging portion is moved upward in the first locking portion. And the second engaging portion is provided with a pair of left and right engaging pieces spaced apart in the left-right direction, and the opposing inner surfaces near the free ends of both engaging pieces are arcuate in plan view. The shaft portion as the second locking portion is formed in a vertical direction slightly longer than the engagement piece. The upper and lower surfaces of the shaft body are provided with upper and lower plates slightly larger than the diameter of the shaft body, and the shaft body is pressed against the opening between the free ends of the pair of engaging pieces from the front-rear direction, By expanding the opening and fitting between the opposed inner surfaces formed in a plan view arc shape, the second locking portion is fitted to the second engaging portion, and the back plate is supported by the backrest frame. Let

According to the present invention, the following effects can be obtained.
According to the first aspect of the present invention, the first engaging portion is fitted into the first engaging portion from above, and then the second engaging portion is fitted into the second engaging portion from the front-rear direction. Therefore, since the back plate is attached to the back frame, the back plate can be attached to the back frame very easily and reliably.

  According to the invention described in claim 2, the same effect as that of the invention described in claim 1 can be obtained.

  According to the invention described in claim 3, the first locking portion and the first engaging portion, and the second locking portion and the second engaging portion are relatively rotated about the vertical axis, respectively. Since the back plate is attached to the backrest frame so that it can be fitted, it is easy to displace the left and right sides of the back plate due to the backward load from the seated person's back, and it has a desirable shape that bulges backward in plan view Bending can be obtained, and a comfortable sitting comfort can be easily obtained such that the seated person is wrapped from the left and right sides.

  According to the fourth aspect of the present invention, the support portion constituted by the engaging portion and the engaging portion can be easily rotated around the vertical axis, and the back plate can be swung in the vertical direction effectively. Therefore, the sitting comfort is further improved.

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 upper and lower plates 19, 19 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. It is formed by providing.

  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 showing 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.

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.

Explanation of symbols

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 (4)

When supporting a back plate made of a hard elastic body such as a synthetic resin on the front surface of a backrest frame extending upward from the rear part of the seat body,
After the back plate and the backrest frame are fitted to the first engaging portion provided on one side from the upper side in the vicinity of the upper end portions on the left and right side portions of the both, The back plate is supported by the backrest frame by fitting the second engaging portion provided on the other side into the second engaging portion provided on the other side from the front-rear direction in the lower portion of the left right side portion. How to attach the back plate in the chair. When supporting a back plate made of a hard elastic body such as a synthetic resin on a backrest frame extending upward from the rear part of the seat body,
After the back plate and the backrest frame are fitted to the first engaging portion provided on one side from the upper side in the lower portion of the left and right side portions of both, the left and right sides The back plate is supported by the backrest frame by fitting the second engaging portion provided on the other side to the second engaging portion provided on the other side in the front-rear direction in the vicinity of the upper end of the portion. How to attach the back plate in the chair.   The first locking portion and the first engaging portion, and the second locking portion and the second engaging portion are respectively fitted so as to be relatively rotatable around the vertical axis. The attachment method of the back board in the chair of Claim 1 or 2 to do. The first locking portion is formed with a first shaft portion in the vertical direction, the first shaft portion is fixed to a back plate or a backrest frame by a support, and the first engaging portion has a substantially C-shaped cross section. The upper end of the cylindrical body in the vertical direction whose one end is opened in a slit shape is closed, the first shaft is fitted into the cylindrical body from below, and the support is By fitting the cylindrical body into the slit-like opening in the vertical direction, the first engaging portion is fitted into the first engaging portion from above, and the second engaging portion is engaged with a pair of left and right engagements. The stop pieces are provided in the right and left direction with an appropriate distance, and the opposing inner surfaces in the vicinity of the free ends of both engagement pieces are formed to be recessed so as to be arcuate in plan view. The part is slightly larger than the diameter of the shaft body on the upper and lower surfaces of the shaft body in the vertical direction slightly longer than the engagement piece. The opposed plate formed by providing upper and lower plates, and pressing the shaft body against the opening between the free ends of the pair of engaging pieces from the front-rear direction to expand the opening to form an arc shape in plan view The back plate is supported by the backrest frame by fitting the second engaging portion to the second engaging portion by fitting between the inner surfaces. To install the back plate of the chair.

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