JP5567821B2 - Chair back - Google Patents

Description

  The present invention relates to a backrest of a chair.

  As a backrest of a chair, there is a configuration in which a back plate is attached to the back frame as a configuration having a back frame as a strength member constituting an outer peripheral portion and a back plate arranged in front of the back frame. An example thereof is disclosed in Patent Document 1.

That is, in Patent Document 1, the back plate is disposed in a state of being spaced from the back frame (backrest frame), and the shaft portion protruding upward is integrally formed on the upper front surface of the left and right vertical frames in the back frame. On the other hand, on the upper part of the left and right side parts of the back plate, a female engaging part that fits from the top to the shaft part of the vertical frame is provided, and further, the lower part of the back frame has an opening forward in plan view. An engagement piece having a C-shaped groove is formed, and a vertically long shaft provided on the back plate is pushed into the engagement piece for mounting. Therefore, there is a space between the back plate and the back frame, and the whole body pressure support is exposed to the back.

JP 2008-119220 A

  In many cases, only the skin material is applied to the back plate for cosmetic purposes, or the skin material is applied through a cushion material. In any case, the skin must be attached to the backplate in a state that does not come off or shift. Therefore, if the entire back plate is exposed to the back as in Patent Document 1, the entire attachment portion of the skin material is necessarily exposed, so that it is troublesome to process so that the aesthetics do not deteriorate. There is a problem of becoming.

  The present invention has been made to improve such a current situation, and intends to provide a backrest in which a body pressure support with a skin material is attached to a back frame in a more improved form.

The invention of claim 1 includes a back frame that constitutes an outer peripheral portion of the backrest and functions as a strength member, and a body pressure support disposed on the front side of the back frame. In the basic configuration in which at least the whole or part of the left and right side portions overlaps the back frame from the front, the front surface of the body pressure support is directly covered with a skin material or a skin material via a cushion material. covered and, at a place hidden overlapping on at least the back frame of the body pressure support, the boss or a hook provided as a mounting portion of the skin material, fitting the edges of the skin material to the boss or a hook Or it is locked by hooking .

According to a second aspect of the present invention, in the first aspect, the body pressure support and the back frame are overlapped to form a hollow portion, and a boss or a hook of the body pressure support is exposed to the hollow portion. .

According to a fourth aspect of the present invention, in the same basic configuration as in the first aspect, the front surface of the body pressure support is covered directly with a skin material or with a skin material via a cushion material, and the body pressure support An attachment portion for the skin material is provided at least in a portion of the body that is hidden by overlapping with the back frame, and the peripheral portion of the body pressure support body is also visible from behind without overlapping with the back frame. The mounting structure for attaching the skin material to the portion of the body pressure support that overlaps the back frame is different from the mounting structure for attaching the skin material to the exposed portion of the back frame. .

According to a third aspect of the present invention, in the first or second aspect , the periphery of the skin material extends to the back side so as to embrace the front surface of the body pressure support, and a tape-like edge member is attached to the periphery of the skin material The edge member is locked to the boss or hook of the body pressure support.

  In the present invention, the skin material mounting portion provided at the overlapping portion with the back frame of the body pressure support body is not exposed to the outside, so that the skin material mounting portion at the overlapping portion has strength maintenance without considering aesthetics, etc. Therefore, it is possible to securely and easily attach the skin material to the body pressure support body while ensuring aesthetics.

Now, the back frame and the body pressure support is also possible to overlap at all in the absence of the space, which in that a strong limitation to the mounting structure of the skin material.

In the present invention of claim 2 contrast, with between the back frame and the body pressure support for the hollow portion exists, it is easy to provide a boss or hook (portion subjected Tsu pull), In order to easily attach the body pressure support to the back frame, it is possible to easily provide an engaging means such as an engaging claw.

  Although it is possible to superimpose the body pressure support body on the back frame over the entire circumference, in this configuration, for example, it is difficult to ensure the bending function of the body pressure support body at the time of locking, and the design restrictions are increased. The problem is concerned.

On the other hand, when a part of the body pressure support is an exposed part that does not overlap the back frame as in the invention of claim 4 , for example, the lower part of the body pressure support is an exposed part so that the bending property at the time of rocking can be achieved. It can easily cope with raising the level. And since the exposed part touches the human eye, it is necessary to design the attachment part of the skin material in consideration of aesthetics. In the invention of claim 4 , the attachment part of the superposed part is attached as an attachment structure considering only the aesthetics of the exposed part. Since the structure has only to be designed for the purpose of ensuring the strength, etc., the design effort can be reduced.

As the means for attaching the skin material to the body pressure support may be selected from various structures including bonding the screwing example, when using a tape-shaped edge member as claimed in claim 4, the attachment to the body pressure support Since it is only necessary to lock the edge member to the locking portion (boss or hook), there is an advantage that the skin material can be efficiently attached.

It is an external view of the chair which concerns on embodiment, (A) is a perspective view, (B) is a side view. It is the perspective view which looked at the chair from the upper part. (A) and (B) are separate perspective views. It is the fragmentary perspective view which turned the back plate over and arranged with the back frame. It is the elements on larger scale of FIG. FIG. 6 is a partially enlarged view of FIG. 5. FIG. 5 is a partially enlarged view of the upper part of FIG. 4. (A) is the elements on larger scale of a back frame, (B) is a partial top view of a backrest. It is a perspective view of the lower part of a back board. (A) is a separated plan view for explaining the attachment of the mesh skin material, (B) is a broken perspective view of the upper frame, and (B) is a broken perspective view of the lower frame. (A) is a separated rear view of the back plate and the mesh-type skin material, (B) is a sectional view taken along line BB of (A), (C) is a sectional view taken along line CC of (A), (D) (D) is a DD cross-sectional view of (A), and (E) is a EE cross-sectional view of (A). (A) is a longitudinal side view for explaining the tension state of the mesh-type skin material, (B) is a side cross-sectional view of the backrest taken along the line XIIB-XIIB in FIG. 8 (A), and (C) is the backrest. It is the sectional side view cut | disconnected by the XIIC-XIIC view location of FIG. 8 (A). (A) is a cross-sectional plan view of the backrest cut at the position XIIIA-XIIIA in FIG. 5, (B) is a cross-sectional view of the backrest cut at the position XIIIA-XIIIA in FIG. 5, (C) is (A) FIG. 6 is a cross-sectional plan view of the backrest taken along the line XIIIA-XIIIA in FIG. 5. (A) is a schematic front view of a cushion unit in which a cushion is covered with a bag-like skin material, (B) is a cross-sectional view taken along line BB in (A), (C) is a cross-sectional view taken along line CC in (A), (D) is DD sectional view taken on the line (A). It is a figure similar to FIG. 12 regarding a backrest of a cushion type. It is a figure similar to FIG. 13 regarding the backrest of a cushion type.

  Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a swivel chair frequently used for office work. In the following description, the front / rear / left / right wording is used to specify the direction, which is defined as the front direction of the seated person on the basis of the person normally seated in the chair. The front view direction is a direction opposite to the seated person, and the rear view direction is a direction when the seated person is viewed from behind.

(1) Outline As shown in FIGS. 1 and 2, the chair includes a leg device displaying only the leg column (gas cylinder) 1, a base 2 fixed to the state of the leg column 1, and a seat disposed above the base 2. 3. It has a backrest 4 arranged behind the seat 3.

  The backrest 4 includes a back frame 5 connected to the base 2 so as to be able to tilt backward, and a back plate 6 (inner shell) attached to the front surface of the back frame 5 as an example of a body pressure support member. As shown in (A), a thin sheet-like mesh skin material 7 is stretched on the front surface of the back plate 6.

  As shown in FIG. 3, the back frame 5 includes a vertically long left and right side frame 8 that constitutes the left and right sides thereof, a horizontally long upper frame 9 connected to the upper ends of the left and right side frames 8, and the lower ends of the left and right side frames 8. Left and right longitudinal lower frames 10 connected to each other, and as a whole, has a frame shape that is substantially square and open forward and backward. Further, side arms 11 that extend forward toward the left and right outer surfaces of the base 2 are integrally formed at the lower ends of the left and right side frames 8.

  The back frame 5 uses a molded product made of a synthetic resin such as polypropylene, but an aluminum die-cast product can also be adopted. Further, for example, the side arm 11 may be constituted by a plurality of members such as a separate member.

For example, as best shown in FIG. 8, upper frame 9 constituting the back frame 5 is formed in a state where the back plate 6 only on the left and right side portions is largely forward opening in a plan view as attach. In other words, the horizontally long upper space 13 is vacant between the upper frame 9 and the back plate 6 of the back frame 5. Therefore, an upper exposed portion 6a (see FIG. 2) that can be seen from behind exists at the top of the back plate 6. Therefore, a person can grasp the upper frame 9 of the back frame 5 and the upper end portion of the back plate 6 can be elastically deformed.

  As clearly shown in FIGS. 1B and 2, the side frame 8 of the back frame 5 is bent in a forward projecting shape in a side view so that the portion slightly higher than the waist of the seated person is at the forefront. Yes. In other words, the side frame 8 of the back frame 5 is bent in a dogleg shape when viewed from the side, and thus the side frame 8 has a vertex portion 14.

The back plate 6 is not attached to the back frame 5 at a portion below the apex portion 14 of the back frame 5 and is in a cantilever state. In other words, a portion of the back plate 6 below the apex portion 17 of the back frame 5 is overhanging. Therefore, as shown in FIG. 1, the lower part of the back plate 6 is a lower exposed portion 6b that can be seen from the rear.

  In addition, as shown in FIG. 1, the side frame 8 of the back frame 5 is in a neutral state where no seated person is leaning, and the portion above the apex portion 14 is in a backward inclined posture, and is below the apex portion 14. The part is leaning forward.

(2). Back plate and back frame Next, the structure of the back plate 6 and the back frame 5 will be described. The attachment structure of the mesh type skin material 7 will be described after the structure of the back plate 6 and the back frame 5 is described.

  The back plate 6 is a molded product made of a synthetic resin such as polypropylene. As shown in FIG. 3, the upper and lower side members 16 are connected integrally between the upper and lower side members 16 and the upper ends of the side members 16. 17 and the lower member 18 integrally connected to the lower ends of the left and right side members 16 form a substantially rectangular outer shape, and further, horizontally long support plates 19 connected to the left and right side members 16 are arranged in multiple stages inside. ing.

For example, as shown in FIG. 4, the support portion back plate 6 overlaps of the side frame 8 of the back frame 5 has a forwardly open groove-shaped. That is , the longitudinal groove 20 extending over the entire length is formed in the support portion of the side frame 8. A portion of the upper frame 9 that overlaps the upper member 17 of the back plate 6 also has a groove shape with a forward opening.

On the other hand, each member 16 , 17 , 18 of the back plate 6 has a groove shape opened rearward. For this reason, the portion sandwiched between the back frame 5 and the back plate 6 is a hollow portion. In other words, the back frame 5 and the back plate 6 are overlapped to form a hollow structure.

And as shown in FIG. 13, the side frame 8 and the side member 16 have overlapped from the front-back direction. The back portion 21 of the side frame 8 is gently curved so as to come forward as it goes outward in plan view, and the longitudinal wall 20 is formed by providing an inner wall 22 and an outer wall 23 on this. The back portion 21 of the side frame 8 protrudes inward from the inner wall 22. The side member 16 of the back plate 6 is gently curved in a forward concave shape, and by forming an inward rib 24 extending toward the inner wall 22 of the side frame 8, a shallow groove opened rearward is formed. Yes.

  Inner step portions 25 that mesh with each other are formed on the inner wall 22 of the side frame 8 and the inward ribs 24 of the side member 16. Thus, the back plate 6 is held so as not to be displaced inward because the inner step portions 25 are engaged with each other. A slit-like gap is formed between the inner wall 22 of the side frame 8 and the inner step portion 25 of the back plate 6.

  For this reason, even if the thickness of the skin material is different, the difference in thickness can be absorbed. In addition, the inner wall 22 of the side frame 8 and the inward ribs 24 of the back plate 6 may rub against each other to generate powder. However, even if powder is generated, the powder accumulates in the gaps, so that it is visible from the outside. Therefore, it is possible to prevent a decrease in aesthetics.

The inner step portion 25 of the side frame 8 and the inward rib 24 of the back plate 6 are in contact with each other via the skin material 7. Therefore , the back plate 6 is accurately defined in the front-rear position with respect to the side frame 8.

  The outer wall 23 of the side frame 8 has a narrow rib shape and is formed to be shifted inward from the outer end of the back portion 22. Therefore, an outer step portion 26 is formed on the outer side of the outer wall 23. . Some space is provided between the outer wall 23 of the side frame 8 and the side member 16.

  For example, as shown in FIG. 4, on the inner surface of the side member 16 in the back plate 6, three plate-like male fitting portions 27 that are vertically long and long apart are formed. On the other hand, in the vertically long groove 20 of the side frame 8, three pairs of female fitting portions 28 formed of two ribs sandwiching the male fitting portion 27 of the back plate 6 from the left and right are formed. Note that the female fitting portion 28 may be formed on the side member 16 and the male fitting portion 27 may be formed on the side frame 8.

  By fitting the male and female fitting portions 27 and 28 together, the back plate 6 is held so as not to be laterally displaced with respect to the back frame 5. For this reason, the side member 16 does not move inwardly with respect to the side frame 8 at the time of locking, and the side frame 8 and the side member 16 are in an integrated state, so that the entire backrest 4 is The rigidity is high. For this reason, there is no problem that the side frame 8 and the side member 16 are shifted to the left and right by a locking load and a gap is opened between them.

As shown in FIGS. 4 and 5, in the groove of the side member 16 in the back plate 6, two first hooking claws 30 are formed so as to be separated downward in a side view. On the side frame 8 of the frame 5, two upward hook-shaped second engagement claws 31 that mesh with the first engagement claws 30 are formed apart from each other in the vertical direction. These engaging claws 30 and 31 are a specific example of the engagement means, the engagement of these, the back plate 6 is held positively immovable relative to the back frame 5.

  For example, as shown in FIG. 5, a partition plate 32 is formed at the apex portion 14 of the side frame 8, and the vertically long groove 20 is vertically divided by the partition plate 32. And the lower guide part 33 which inclines forward so that the upper surface 33a goes up in a side view is formed in the inner surface of the location just above the partition plate 32 among the vertical grooves 20, while the side in the back plate 6 The member 16 is formed with a lower protrusion 34 that enters between the lower guide portion 33 and the inner wall 22, and the lower protrusion 34 is provided with a lateral stopper 34 a that overlaps the inclined surface of the lower guide portion 33.

  By tilting the back plate 6 forward so that the upper part of the back plate 6 is far away from the back frame, the lateral stopper 34 a can be fitted inside the lower guide portion 33. The side member 16 is provided with a lower positioning protrusion 35 that extends upward while being connected to the lower protrusion 34. The lower positioning projection 35 is close to the bottom surface of the vertically long groove 20 in the side frame 8 (may be abutted).

Therefore, the lower positioning projection 35 also serves as a stopper that regulates the front-rear position and the left-right position of the side frame 8 and the side member 16. The lower positioning protrusion 35 has a shape in which a vertical rib and a large number of horizontal ribs cross each other, and there is a space between the lower protrusion 34 and the inner side surface of the vertical groove 20.

For example, as shown in FIGS. 4-7, the side members 16 of the back plate 6, a locking means, the boss 36 is a plurality backward projecting above and below appropriate intervals. The boss 36 is formed in a trapezoidal shape whose outer diameter decreases toward the tip. On the other hand, a receiving portion 37 with which the boss 36 of the side member 16 abuts is formed in the longitudinal groove 20 of the side frame 8 (see also FIG. 13B).

The boss 36 and the receiving portion 37 also serve as a restricting means that restricts the front-rear position of the side frame 8 and the side member 16. As shown in FIG. 11, the boss portion 36 is also formed at a connecting portion between the side frame 8 and the upper frame 9 of the back plate 6.

  For example, as can be easily understood from FIG. 4, the vertically long groove 20 is continuous with the horizontally long groove 38 formed in the left and right side portions of the upper frame 9. The upper frame 9 is formed with a pressing portion 39 that forms the left and right end surfaces of the upper space 13, and a laterally long groove 38 is opened outside the pressing portion 39. The holding portion 39 is formed with a forward-facing auxiliary rib 40, and further, an upper engagement piece 41 that is continuous with the inner wall 22 of the side frame 8 is formed on the auxiliary rib 40. The joint hole 42 is vacant.

  On the other hand, the upper member 17 of the back plate 6 is formed with an upper engagement claw 43 that fits and engages with the upper engagement hole 42 from above. A side partition plate 44 is formed inside the upper engagement claw 43 of the upper member 17. The side partition plate 44 is set so as to be placed on the outer end portion of the auxiliary rib 40 in the upper frame 9. The side partition plate 44 is provided with a stopper piece 44 a located above the upper engagement claw 43.

  As can be understood from FIG. 12C, the stopper piece 44 a can come into contact with the upper surface plate 9 a of the upper frame 9 from below.

  As shown in FIG. 10B and FIG. 12A, the front surface of the upper member 17 is curved so as to shift backward as it goes up, and three-step ribs are formed on the back surface of the upper member 17. By forming, the upper horizontal groove 45 and the lower horizontal groove 46 are formed. As clearly shown in FIG. 8, the upper and lower lateral grooves 45 and 46 are formed between the left and right side partition plates 44.

For example, as can be inferred from FIG. 4, the side partition plate 44 of the upper member 17 is located at a location on the outer surface of the pressing portion 39 in the upper frame 9. Accordingly, as shown in FIG. 15B, the left and right ends of the upper and lower horizontal grooves 45 and 46 in the upper member 17 are positioned in front of the pressing portion 39.

  As shown in FIG. 10C, the lower member 18 of the back plate 6 has a substantially cross-sectional shape that opens rearward, and a step is formed on the upper inner surface. In addition, a lower engagement hole 47 opened in the front-rear direction is formed in the left and right intermediate portion and the left and right side portions, and a lower protrusion 48 is provided to protrude upward at the position of the engagement hole 47.

As shown in FIG. 9, a longitudinal groove is also formed in a portion of the side member 16 of the back plate 6 below the lower protrusion 34 (that is, the exposed portion 16a of the side member 16). An inwardly saddle-shaped saddle-shaped boss 50 projects from the vertically long groove. Further, the longitudinal grooves of the exposed portion 16a are a plurality form the support ribs 51 at appropriate intervals.

  In attaching the back plate 6 to the back frame 5, the skin material 7 is first attached to the back plate 6, and then the back plate 6 is attached to the back frame 5. The back plate 6 is attached in the following procedure.

  That is, as can be understood from FIG. 5, the lateral stopper 34 a is formed by placing the lower projection 34 on the lower guide portion 33 of the side frame 8 in a posture in which the back plate 6 is tilted forward and shifting it downward. Is brought into contact with the inclined surface of the lower guide portion 33. As a result, the back plate 6 is held in a state in which it does not shift from side to side with respect to the back frame 5.

  Next, the back plate 6 is tilted backward with the lower end portion as a fulcrum, slightly lifted and pressed against the back frame 5 to fit the male and female fitting portions 27 and 28, and then the back plate 6 is shifted downward. Thus, the first engagement claw 30 and the second engagement claw 31 are engaged with each other.

  The first engagement claw 30 and the second engagement claw 31 are engaged with each other with the upper end of the back plate 6 raised slightly forward until the engagement pieces 30 and 31 are completely engaged with each other. The front end of the upper plate 9 abuts against the upper surface plate 9 a of the upper frame 9 against the elasticity from the front.

  When the first engagement claw 30 and the second engagement claw 31 are completely engaged with each other, the upper engagement claw 43 is fitted into the upper engagement hole 42, and the stopper piece 44 a is formed on the upper surface plate 9 a of the upper frame 9. It enters downward (it fits in the horizontally long groove 38), whereby the back plate 6 is held so as not to be able to be displaced vertically and horizontally and back and forth with respect to the back frame 5. In this way, the back plate 6 can be attached to the back frame 5 by a very simple procedure.

In addition, after setting the lower guide portion 33 of the back plate 6 to the side frame 8, the back plate 6 is pushed forward with the lower end of the back plate 6 as a fulcrum to press the back plate 6 into the back frame 5, thereby engaging It is also possible to engage the claws 30 and 31. The front of Ryokakarigotsume 30 and 31 forms an inclined surface which allows the engagement of each other. When this method is adopted , the assembly is further simplified.

(3). Attachment Structure of Mesh Type Skin Material 7 Next, the attachment structure of the mesh type skin material 7 will be described. The mesh-type skin material 7 is attached to the upper member 17 by an edge member (tape) fixed to the outer periphery thereof. That is, as shown in FIGS. 10 and 11, the mesh-type skin material 7 includes a first side edge member 53 that overlaps with a portion of the side member 16 above the exposed portion 16 a from the back, and a lower exposed portion of the side member 16. A second side edge member 54 that overlaps from the back side of 16a, a corner edge member 55 that overlaps the upper corner of the back plate 6 from the back side, and an upper edge member 56 that overlaps the upper member 17 from the back side between the corner edge members 55 The lower edge member 57 that overlaps the lower member 18 of the back plate 6 from the back is fixed by adhesion or adhesion.

Each edge member uses a resin sheet such as polypropylene, but other materials can also be used. The corner edge member 55 can be integrally connected to the first side edge member 53. Further, using what the side edge member 53, 54 and the corner edge member 55 is turned into a series, it is possible to independently of putting cut after sewn to the mesh-type skin material 7.

The first side edge member 53, the side fit into the boss 36 of the member 16 and the first mounting hole 58 is formed, as shown in FIG. 13 (B), the first side edge member 53, the side from the outer It enters between the member 16 and the side frame 8 and is fitted into the boss 36. The first side edge member 53 faces the side member 16 and, therefore, only the mesh skin material 7 can be seen from the outside. Further, the mesh-type skin material 7 is in contact with the outer wall 23 of the upper frame 9, so that the inside of the side frame 8 (vertically long groove 20) is not visible. For this reason, it is excellent in aesthetics.

  Although the back plate 6 is made of resin, the outer surface may be painted. In this case, it is troublesome to paint the inside of the vertically long groove 20. In this regard, when a configuration in which the inside of the vertically long groove 20 is not visible on the outer wall 23 as in the present embodiment is adopted, it is sufficient to paint only the outside without painting the inside, so that the cost required for painting can be suppressed.

As shown in FIGS. 10 and 11, the first side edge member 53 is formed with a notch 59 so as not to obstruct the connecting portion between the side frame 8 and the side member 16.

The second side edge member 54 has a belt-like shape in which the notch 59 does not exist. As shown in part in FIG. 9, the exposed portion 16 a of the side member 16 of the back plate 6 has an inner stepped portion 16 c. and the outer stepped portion 16d is formed, the second side edge member 54 is fitted in the space between the inner stepped portion 16c and the outer stepped portion 16d, Therefore, the non displaced in the width direction Is retained. The second side edge member 54 also has a mounting hole 58 that is fitted into the hooked boss 50.

The second side edge member 54 also has a mounting hole 58 that is fitted into the hook-shaped boss 50. Since the hook-shaped boss 50 has a hook shape having an inward protruding portion at the tip, the second side edge member 54 does not come off. The second side edge member 54 also overlaps the side member 16 and cannot be visually recognized from the outside . In other words, even when the exposed portion 16b of the side member 16 is viewed from behind, the second side edge member 54 cannot be visually recognized, and only the mesh-type skin material 7 is visible. For this reason, aesthetics are ensured.

  The corner edge member 55 is also held so as not to be detached by fitting into the boss 36. The corner edge member 53 has a curved outer shape that protrudes obliquely outward in accordance with the corner portion of the back plate 6. In FIG. 11, the corner edge member 55 is displayed in an inwardly convex posture. When it is folded back and attached to the back plate 6, it becomes an outwardly convex posture. The inner end portion of the corner edge member 55 is narrow, and is arranged on the upper side of the stopper piece 44 a connected to the side partition plate 44 as shown in FIG.

As shown in FIG. 12A, the upper edge member 56 is fitted into the upper horizontal groove 45 of the upper member 17 from behind. The upper edge member 56 overlaps the upper surface of the upper lateral groove 45, and therefore, the upper edge member 56 is not exposed to the outside. For this reason, there is no problem of aesthetics. The left and right ends of the upper edge member 56 extend to the side partition plate 44. Then, as shown in FIG. 12 (B), the left and right ends of the upper edge member 56 is backward immovably held by the holding portion 39 provided on the upper frame 9. For this reason, even if the upper edge member 56 is merely fitted into the upper lateral groove 45, it is held so that it cannot be removed.

As shown in FIG. 12 (B), the lower edge member 57 is disposed so as to block the lower member 18 from the rear, and the lower engagement holes of the lower member 18 are formed at three positions, that is, the left and right intermediate portions and the left and right side portions. A hook-shaped engagement claw 61 is formed to be fitted into the 47, and the engagement claw 61 is hooked on the lower projection 48 of the engagement hole 47 from the front. As a result, the lower edge member 56 is held by the lower member 18 so as not to be detached.

  The mesh-type skin material 7 is attached to the back plate 6 by first attaching the left and right side edge members 53 and 54, then attaching the lower edge member 57, and finally attaching the upper edge member 56. Done in In this way, the mesh-type skin material 7 is attached to the back plate 6, and the back plate 6 with the skin material is attached to the back frame 5. At the time of attachment to the back frame 5, the peripheral portion of the mesh-type skin material 7 comes into contact with the back frame 5 and is slightly stretched and deformed.

In this embodiment, since the engaging means such as the engaging claws 30 and 31 and the positioning means are arranged in the long groove 20 of the side frame 8, the connecting structure is not exposed to the outside, and it is excellent in aesthetics. Further, since the first side edge member 53 and the corner edge member 55 are not visible from the outside, there is no need to consider the problem of aesthetics, and the mesh-type skin material 7 cannot be shifted left and right by adopting the hooking method to the boss 3. Can be retained.

On the other hand, the mesh type skin material 7 can be easily attached to the upper member 17 by using the upper edge member 56, and the second side edge member 54 is used for attachment to the lower exposed portion 16 a of the side member 16. In addition, the attachment to the lower member 18 can be easily performed by using the lower edge member 17 having the engaging claw 61. And since the upper edge member 56, the 2nd side edge member 54, and the lower edge member 17 cannot be visually recognized from an outer side, there is no problem of aesthetics.

  Thus, since the attachment structure of the mesh-type skin material 7 is made different between the portion that cannot be seen from the outside and the portion that can be seen, an optimum attachment structure corresponding to the position and function can be adopted. Thereby, attachment workability | operativity is improved, maintaining an aesthetics, and also it can attach to the backplate 6 firmly.

(4) Cushion material mounting structure Cushion material can be stretched on the back plate 6. This point is displayed in FIGS. The cushion material 63 is accommodated in a bag body 66 having front and back sheets 64 and 65 made of cloth or the like. The bag body 66 is an example of a skin material.

As can be understood from FIG. 14 , the bag body 66 basically opens upward, and the left and right side portions are also cut open at a portion above the apex portion 14 of the back frame 5. To be precise, a cushion material 63 is stretched on the front surface of the back plate 6 and both are covered with a bag 66. Therefore, the back sheet 65 is located on the back side of the back plate 6, and the back plate 6 cannot be visually recognized from the back side (although it can be seen through).

  The first side edge member 53 is attached to the side edge of the front sheet 64 and the side edge of the back sheet 65, the corner edge member 55 is attached to the corner portion of the back sheet 65, and the upper edge of the front and back sheets 64, 65 is upper. The edge member 56 is attached. Although the corner edge member 55 is not attached to the upper sheet 65, it can be attached to this.

As shown in FIG. 16, the first side edge member 53 of the front sheet 64 is fitted to the boss 36 in the same manner as in the case of the mesh-type skin material 7. On the other hand, the first side edge member 53 of the back sheet 65 is disposed on the back side of the side member 16 from the inside and is fitted to the boss 36. Accordingly, the side portion of the back sheet 65 is sandwiched between the side frame 8, the inner wall 22, and the inner rib 24 of the side member 16.

  As shown in FIG. 15, the upper edge member 56 of the front sheet 64 is fitted in the upper horizontal groove 45 as in the case of the mesh-type skin material 7, while the upper edge member 56 of the back sheet 65 is rearward of the lower horizontal groove 46. It is fitted from. The left and right ends of the upper and lower upper edge members 56 are held by the pressing portion 39 of the upper frame 9 so as not to move backward. The corner edge members 55 are arranged in the same manner as in the case of the mesh skin material 7. Since the exposed portion 6a of the back plate 6 is completely covered with the bag body 66, no attachment means such as an edge member is required at this location.

  As shown in FIG. 16, when the cushion material 63 is turned around to the side edge of the side member 16, the edge portion of the cushion material 63 can enter the outer step portion 26 of the side frame 8. For this reason, the edge part of the cushion material 63 can be processed beautifully, and beauty can be improved.

(5). Others The present invention can be embodied in various ways other than the above embodiments. For example, the back plate may have a simple plate shape (shell shape). The body pressure support body does not necessarily need to have a back plate, and for example, a structure in which a mesh-like support sheet is stretched on a frame material opened in the front-rear direction may be used.

Various modes such as a combination of an engaging claw and an engaging hole can be selected as the engaging means. As a mounting portion for holding the skin material on a body pressure support such as a back plate , a hook method (saddle method) can also be adopted. The edge member is not necessarily in the form of a tape, and various members such as a bar, a wire, a hollow material, and a channel material can be used.

  The present invention is useful when applied to a chair. Therefore, it can be used industrially.

4 Backrest 5 Back frame 6 Back plate as an example of body pressure support 7 Mesh type skin material 8 Side frame 9 Upper frame 16 Side member of back plate 17 Upper member of back plate 20 Longitudinal grooves 30 and 31 constituting a hollow portion Engaging claw as an example of joint means
The boss | hub 53-57 edge member which comprises 36 latching | locking parts
58 First mounting hole to fit into the boss

Claims (4)

A back frame that constitutes the outer periphery of the backrest and functions as a strength member; and a body pressure support disposed on the front side of the back frame, and at least the entire left and right side portions of the body pressure support Or a backrest that part of it overlaps the back frame from the front,
The front surface of the body pressure support body is directly covered with a skin material or covered with a skin material through a cushion material, and at least a portion of the body pressure support body that is hidden by overlapping the back frame, A boss or hook is provided as an attachment part of the skin material, and the edge of the skin material is fitted or hooked to the boss or hook to be locked .
The back of the chair. The body pressure support and the back frame are overlapped to form a hollow part, and the boss or hook of the body pressure support is exposed to the hollow part.
The chair back according to claim 1. The peripheral edge of the skin material extends to the back side so as to embrace the front surface of the body pressure support, and a tape-like edge member is attached to the periphery of the skin material, and this edge member is attached to the boss of the body pressure support body or Locked to the hook,
The chair back according to claim 1 or 2. A back frame that constitutes the outer periphery of the backrest and functions as a strength member; and a body pressure support disposed on the front side of the back frame, and at least the entire left and right side portions of the body pressure support Alternatively, in a backrest that a part of the backrest overlaps the back frame from the front, the front surface of the body pressure support is covered directly with a skin material or covered with a skin material through a cushion material, and the body pressure The structure is provided with an attachment portion of the skin material in a place hidden at least overlapping the back frame of the support,
The peripheral portion of the body pressure support has an exposed portion that does not overlap the back frame but can be seen from behind, and the skin material is placed on the portion of the body pressure support that overlaps the back frame. The mounting structure for mounting is different from the mounting structure for mounting the skin material to the exposed portion of the back frame.
The backrest of the chair child.

Images