JP7252738B2 - chair back - Google Patents

Description

The present invention relates to a chair back. More specifically, it relates to a mesh type backrest.

As a backrest of a chair, there is a structure in which a back frame with front and back openings is covered with a mesh material. In this mesh type backrest, the mesh material should be taut on the back frame. Moreover, since the mesh material is made of a flexible fabric such as a knitted fabric or a woven fabric, or the like, it is difficult to directly and strongly fix the edge of the mesh material to the back frame.

Therefore, it has been proposed to fix the edges of the mesh material to elongated resin-made edge members by means of fittings or the like, and attach the edge members to the back frame. As an example, in Patent Document 1, a rim member is formed to have a U-shaped cross section having a hook-shaped portion, and a groove in which the hook-shaped portion of the rim member is fitted is formed on the front surface of a portion near the inner periphery of the rim member. It is disclosed to form

In addition, in Patent Document 1, more precisely, the edge members arranged at the upper and lower portions of the backrest are in the form of having hook-shaped portions as described above and are connected to the back frame, and the left and right sides of the backrest are The edge member is formed in a strip shape, and the strip plate-shaped edge member is fitted in a groove formed in the outer peripheral surface of the edge member.

Japanese translation of PCT publication No. 2006-110001

In Patent Document 1, which uses a U-shaped cross-sectional edge member, it is understood that the installation is troublesome due to two problems. The first problem is that since the groove is formed in the front surface of the rim member, the rim member must push aside the mesh material to fit the hooked portion into the groove. It is troublesome. It is preferable to stretch the mesh material as tightly as possible, but the more the tension of the mesh material is increased, the more this troublesomeness appears.

The second problem is that it is troublesome to fit the hook-shaped portion into the groove because the edge member is U-shaped over its entire length. Furthermore, if the rim has the same cross-sectional shape over its entire length, it must be positioned and pushed in such that the entire length of the hook-like portion fits into the groove, but the rim is several tens of centimeters long. Positioning is troublesome, and since the edge member is hidden by the mesh material, it is troublesome to align the hook with the groove, so fitting the hook into the groove is a troublesome task. thought.

In addition to the troublesomeness of attachment, in Patent Document 1, since the edge member attached to the lower portion of the back frame is exposed upward, there is a concern that the aesthetic appearance will be deteriorated.

The present invention is made to improve such a situation.

The backrest of claim 1 ,
"A back frame that is open in the front and back, a mesh-like back support sheet material in which the edges arranged so as to overlap the back frame from the front are wound from the outer periphery to the inner periphery of the back frame, and the back. an elongated edge member secured to the edge of the receiving sheet material and attached to the inner periphery of the back frame."
It has a basic configuration.

And the invention of claim 1, in the above basic configuration,
"The edge member is composed of a band plate that overlaps the inner peripheral surface of the back frame, and a group of engaging protrusions that protrude from the band plate toward the outer peripheral side of the back frame , and the engaging protrusions are bosses. formed in a hook shape or mushroom shape with a head at the tip of
the engagement protrusion of the edge member is fitted from behind into a cutout formed in the back frame so as to open rearward,
In addition, the backrest sheet material entirely covers the back frame from behind ."
It is configured.

The invention of claim 2 is, in claim 1,
"The back support sheet material is fixed to the inner surface of the strip plate that does not overlap the back frame, and the edge of the back support sheet material is attached to the surface of the strip plate that overlaps the back frame. By winding up, the edge member is covered by the back support sheet material in an invisible state."
It is configured.

The backrest according to the invention of claim 3,
"A back frame that is open in the front and back, a mesh-like back support sheet material in which the edges arranged so as to overlap the back frame from the front are wound from the outer periphery to the inner periphery of the back frame, and the back. It has vertically elongated longitudinal edge members fixed to the left and right sides of the back sheet material, and left and right elongated horizontally elongated edge members fixed to the top and bottom of the back sheet material."
In the basic configuration of
"The longitudinal edge member is composed of a band plate that overlaps the inner peripheral surface of the upper and lower longitudinal side members of the back frame, and a group of engaging projections that protrude from the band plate toward the inside of the side member of the back frame. is composed of
The engaging projection is formed in a hook shape or mushroom shape having a head at the tip of the boss,
The side member of the back frame is formed with a cut-out portion into which the boss of the engaging projection is inserted and engaged so as to open rearward,
The laterally long edge member is composed of a band plate that overlaps the inner peripheral surface of the left and right longitudinal upper member or lower member of the back frame, and a group of plate-like engaging pieces projecting outward in the vertical direction from the band plate. has been
An engagement hole is formed in the engagement piece, and the upper member and the lower member of the back frame are provided with an engagement hole into which the engagement piece enters and an engagement hole in which the engagement piece is fitted . A mating claw is formed.”
It is configured.

In the present invention, since the engaging projections of the edge member are provided on the band plate overlapping the inner peripheral surface of the back frame, it is not necessary to push the back support sheet material aside when attaching the back support sheet material to the back frame. In addition, since the engaging projections are intermittently arranged in the longitudinal direction of the band plate, it is possible to fit them one by one into the cut-out portion of the back frame. Combined with these, the workability of attaching the backrest sheet material can be improved.

In the structure of claim 2, since the edge member is entirely covered with the backrest sheet material and cannot be visually recognized from the outside, the appearance can be improved.

Since the backrest has a roughly rectangular shape when viewed from the front, it is common to fix the edge members to the four sides, top, bottom, left, and right. However, since the structure of the left and right side members, the upper member, and the lower member of the back frame may differ, it may be difficult to align the structure of the edge members on the four sides to the same structure. Also, from the viewpoint of ease of installation, it may be rational to make the structure of the left and right edge members different from that of the upper and lower edge members.

In this regard, in the structure of claim 3, a combination of an engaging piece and an engaging pawl is employed at the upper member and the lower member of the edge member, so that the laterally long edge member is firmly attached to the upper member and the lower member. while the side member can be easily engaged with the side member by employing a combination of engaging protrusions and cutouts. Therefore, by adopting a procedure of first connecting the horizontally long edge members to the upper member and the lower member and then connecting the vertically long edge members to the side members, the back support sheet material can be easily attached to the back frame. can.

In addition, since the vertically aligned engaging projections are fitted into the cutouts at the side members of the back frame, the vertical positions of the vertically long edge members are precisely defined. Therefore, the vertically elongated edge member is not displaced in the vertical direction by the pressing force of a seated person, and the back support sheet material can be accurately positioned.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the chair which concerns on embodiment, (A) is a front perspective view, (B) is a side view, (C) is a top view. (A) is a front view, and (B) is a rear view. It is a front separated perspective view. (A) is a rear separated perspective view, (B) is a perspective view of an end of an upper support, and (C) is a perspective view of an end of a lower support. (A) is a rear perspective view of the backrest with the backrest sheet material omitted, (B) is a rear separated perspective view of the backrest with the backrest sheet material omitted, (C) is a partial edge member (D) is a partial perspective view of the longitudinal edge member in particular. (A) is a longitudinal side view of the left and right intermediate parts of the upper end, and is a cross-sectional view taken along VIA-VIA in FIG. 5(A), (B) is a cross-sectional view taken along VIB-VIB in FIG. It is a longitudinal side view of the right-and-left middle part among lower end parts. It is a vertical cross-sectional side view which shows a modification with (A) and (B).

Next, embodiments of the present invention will be described based on the drawings. In the following, the terms front, rear, left, and right are used to specify directions, and these directions are specified as seen from a normally seated person (the same applies to claims) . The front view direction is the direction facing the seated person.

(1) Outline of Chair The chair of this embodiment is applied to a swivel chair that is frequently used in offices and the like. As shown in FIGS. 1 and 2, the chair includes, as main members, a seat 1, a backrest 2, a back frame 3 to which the backrest 2 is attached, and a leg device 4 with casters. A lumbar support device 5 is arranged behind the backrest 2. - 特許庁In addition, the chair is provided with an armrest device 6 and a headrest (or shoulderrest) 7 as optional items.

For example, as shown in FIG. 1, a base body 9 is fixed to a leg support (gas cylinder) 8 arranged in the center, and the back frame 3 is connected to the base body 9 via a joint member 10 so as to be tiltable backward. Therefore, the chair of this embodiment is a rocking type in which the backrest 2 is tilted backward against the elastic means.

The back frame 3 includes a vertically long back support 11 positioned in the middle of the right and left sides, a left and right long upper support 12 horizontally rotatably attached to the upper end of the back support 11, and left and right lower supports integrally provided at the lower end of the back support 11. 13, and the left and right ends of the upper support 12 and the tip of the lower support 13 are free ends. The back strut 11 and the upper support 12 are made of synthetic resin. The back support 11 and the lower support 13 are covered with a cover from behind.

When a seated person's pressing force acts on the right side or the left side of the backrest 2, the upper support 12 turns horizontally, and the backrest 2 can be torsionally deformed. Therefore, the backrest 2 is torsionally deformed following the movement of the user's body. The back brace 11 can also be torsionally deformed by the pressing force of a seated person.

As shown in FIG. 1(C), the upper support 12 is recessed toward the front (swelled toward the back) and has a bowed shape when viewed from above. are connected at both left and right ends. Therefore, there is a large space between the upper support 12 and the backrest 2. Due to the presence of this space, the upper end of the backrest 2 is allowed to be stretched and deformed rearward by the pressing force (body pressure) of the seated person.

On the other hand, as clearly shown in FIG. 4, for example, the lower support 13 is curved such that the upper surface and the lower surface become higher toward the tip when viewed from the rear, and the lower surface of the left and right lower supports 13 and the rear strut 11 are curved. The lower surface formed with the lower surface (that is, the lower surface of the back frame 3) is also a curved surface that bulges downward. Therefore, the back frame 3 has a shape similar to an anchor as a whole.

The backrest 2 has a structure in which a back frame 15 opened in the front and the rear is covered with a mesh-shaped back receiving sheet material 16, and the back receiving sheet material 16 is wound backward from the outer circumference of the back frame 15.例文帳に追加Therefore, the back frame 15 is covered with the back support sheet material 16 from the outer peripheral side and the back. The back frame 15 is made of synthetic resin, and includes left and right side members 17 that are long in the vertical direction, horizontal upper members 18 that are integrally connected to the upper ends of the side members 17, and horizontal members that are integrally connected to the lower ends of the side members 17. and the lower member 19, and has a strength such that it can be easily torsionally deformed by a person, for example, when it is not attached to a chair.

(2) Connection structure between the back frame and the backrest As shown in FIGS. While the locking claw 20 projects backward, engaging frame portions 21 into which the locking claw 20 is fitted from above are formed at both left and right ends of the upper support 12 of the back frame 3 .

Further, as shown in FIG. 4(A), the left and right ends of the lower member 19 that constitutes the backrest 2 are provided with tapered prisms in which the head portions of the quadrangular pyramids are cut off (truncated pyramid shape with quadrilateral faces on all four sides). While the protrusion 22 projects backward, as shown in FIG. 4(C), a tapered square recess 23 into which the tapered square protrusion 22 is inserted is formed at the tip of the lower support 13, forming a tapered shape. The tapered rectangular protrusion 22 is pulled into the tapered rectangular recess 23 by a screw (not shown) inserted through the rectangular recess 23 from behind.

The screws are inserted through the lower support 13 from behind, and as shown in FIG. A nut 25 shown in FIG. 4(C) is non-rotatably fitted.

As described above, there is a space between the upper support 12 and the backrest 2, and there is also a space between the lower support 13 and the backrest 2. In addition, the back of the left and right sides of the backrest 2 are open. Therefore, the backrest 2 can be easily elastically deformed so as to be recessed backward by the pressing force of the seated person. Thereby, high fitting property can be ensured.

(3). Back frame/longitudinal edge member As shown in FIG. Basically, it has an L-shaped or similar cross-sectional shape, and on the rear surface , a first rib 26 projecting backward from the front plates 17a, 18a, 19a, each member 17, 18, A group of second ribs 27 oriented across 19 are formed. The outer periphery of each of the front plates 17a, 18a, 19a is rounded in order to prevent stress from concentrating on the back support sheet material 16. As shown in FIG.

The front plate 17a of the side member 17 is slanted so as to shift inward as it goes rearward, but the front plates 18a and 19a of the upper member 18 and the lower member 19 are substantially horizontal. Therefore, the upper member 18 and the lower member 19 are connected in an L shape by the front plates 18a, 19a and the inner peripheral plates 17b, 18b, 19c.

As shown in FIG. 3, the back support sheet material 16 is attached to the back frame 15 via left and right vertically elongated edge members 28 and upper and lower horizontally elongated edge members 29 . The vertically long edge member 28 and the horizontally long edge member 29 are molded products using resin such as polypropylene. The backrest sheet material 16 is a knitted or woven fabric, but laminates can also be used.

As shown in FIGS. 5 and 6, the longitudinal edge member 28 and the lateral edge member 29 have strips 28a, 29a overlapping the inner peripheral plates 17b, 18b, 19b of the back frame 15, and the longitudinal edge member 28 A large number of engaging projections 28b protruding toward the inner peripheral plate 17b of the back frame 15 (toward the outside of the back frame 15) are formed on the band plate 28a of the belt plate 28a so as to be arranged vertically at appropriate intervals. Similarly, on the belt plate 29a of the horizontally long edge member 29, engaging pieces 29b protruding toward the inner peripheral plates 18b, 19b of the back frame 15 (toward the outside of the back frame 15) are arranged at appropriate intervals in the left-right direction. Many are formed side by side.

The engaging projections 28b of the vertically elongated edge member 28 are mushroom-shaped or hook-shaped with a flange-shaped head (claw) 28c at the tip of the boss 28d. The plate 17b is formed with a cut-out portion 30 into which the boss 28d of the engaging projection 28b is fitted so as to open toward the inner peripheral direction of the back frame 15. As shown in FIG. The head 28c of the engaging projection 28b protrudes forward and on both upper and lower sides, and the cut-open portion 30 has a groove width into which only the boss 28d of the engaging projection 28b can enter. Therefore, the head 28c of the engaging projection 28b is hooked on the entire circumference of the cut-out portion 30. As shown in FIG.

As shown in FIGS. 5A and 5B, the cut-out portion 30 and the engaging projection 28b are located between the vertically adjacent second ribs 27 of the side member 17. As shown in FIGS.

As clearly shown in FIG. 6(A), the engaging projection 28b of the longitudinal edge member 28 is formed in the rear half of the band plate 28a. The edge 16a of the backrest sheet material 16 is fixed to the inner peripheral surface of the band plate 28a of the longitudinal edge member 28 by sewing or the like. A thin front edge portion 28e is formed at the front part so as to leave a gap between it and the inner peripheral plate 17b of the side member 17, and the edge 16b of the back support sheet material 16 is extended, Edge extension 16b wraps around the outer surface of front edge 28e. The end edge extension 16b of the back support sheet material 16 may be adhered to the front edge 28e or fixed by sewing or the like.

Since the end edge extension 16b of the back support sheet material 16 is wrapped around the front edge part 28e of the band plate 28a, the vertically elongated edge member 28 is entirely covered with the back support sheet material 16 and is visually recognized by a person. It is not possible. Therefore, it is excellent in appearance.

(4) Horizontal edge member The engaging piece 29b of the horizontal edge member 29 is formed in a plate shape having wide front and rear surfaces, and the inner peripheral plates 18b, 19b of the upper member 18 and the lower member 19 of the back frame 15 are attached. A fitting hole 31 through which the engaging piece 29b of the laterally long edge member 29 passes is formed. Furthermore, while the engagement piece 29b of the laterally long edge member 29 is formed with a square engagement hole 32, the front plates 18a and 19a of the upper member 18 and the lower member 19 are provided with engagement claws 33 that mesh with the engagement holes 32. forming The engaging holes 32 and the engaging claws 33 form engaging means (or engaging portions) that engage against elasticity.

The back frame 15 is manufactured by injection molding using a mold that relatively moves back and forth in the state shown in FIG. Therefore, the fitting hole 31 is opened to the front plates 18a and 19a in order to facilitate the removal of the mold. can be molded to ). It is possible to form engagement holes 32 in the front plates 18a and 19a of the upper member 18 and the lower member 19 and form engagement claws 33 in the engagement pieces 29b. can be molded in a state that can be easily demolded.

Also in the horizontally long edge member 29, the horizontally long edge 16a of the back support sheet material 16 is fixed to the inner surface of the band plate 29a by sewing or the like. In the horizontally long edge member 29, the engaging piece 29b is positioned in front of the band plate 29a, but the band plate 29a has a front edge portion 29d positioned in front of the engaging piece 29b. , the edge extension 16b of the back support sheet material 16 is wound around the front edge 29d. Therefore, the upper and lower horizontally long edge members 29 are covered with the back receiving sheet material 16 and cannot be visually recognized from behind, and the cut surface of the back receiving sheet material 16 is beautifully treated so as not to be exposed. Therefore, it is excellent in appearance.

As can be understood from FIGS. 5A and 5B, the engaging piece 29b of the horizontally long edge member 29 is located between the adjacent second ribs 27 of the upper member 18 and the lower member 19. As shown in FIG. Therefore, the fitting hole 31 and the engaging claw 33 are also positioned between the adjacent second ribs 27 .

The band plate 29a of the lateral edge member 29 connected to the upper member 18 protrudes (overhangs) behind the inner peripheral plate 18b of the upper member 18. As shown in FIG. Therefore, when tension is applied to the backrest sheet material 16, the overhang portion 29e bends upward as indicated by the white arrow in FIG. It can be slid against.

FIG. 7 shows a modification of the engaging means of the laterally long edge member 29. As shown in FIG. In these examples, the engaging piece 29b is arranged in the front-rear intermediate portion of the band plate 29a, and in (A), the engaging piece 29b is formed with an engaging hole 33. As shown in FIG. On the other hand, in (B), an engaging claw 33 is formed in the engaging piece 29b, and an engaging hole 33 is formed in the front plate 18a of the upper member 18. As shown in FIG.

(5) Summary Since the engaging projections 28a and the engaging pieces 29b of the edge members 28 and 29 are fitted into the back frame 15 from the inner peripheral side, there is no need to push the back support sheet material 16 away. Further, since a large number of the engaging projections 28b and the engaging pieces 29b are intermittently arranged, they can be engaged with the back frame 15 one by one, and the positioning is not troublesome. These make it easy to attach the back support sheet material 16 to the back frame 15 .

As for the procedure for attaching the back support sheet material 16 to the back frame 15, it is reasonable to first connect the horizontally elongated edge member 29 to the upper member 18 and the lower member 19, and then attach the vertically elongated edge member 28 to the side member 17. is. Either the attachment of the laterally long edge member 29 to the upper member 18 or the attachment of the laterally long edge member 29 to the lower member 19 may be performed first.

When the backrest sheet material 16 is attached to the side members 17 of the back frame 15, the engaging projections 28b can be fitted into the cutouts 30 in a one-touch manner by hooking the hooks. 16 installation work can be done efficiently. In addition, when tension is applied to the backrest sheet material 16 by the pressing force of a seated person, the engagement piece 29b is strongly hooked on the cut-out portion 30, so that the engagement projection 28b is not in contact with the cut-out portion 30 during use. There is no such thing as straying from The relationship between the engaging piece 29b and the engaging claw 33 is the same.

In the chair of this embodiment, as described above, the backrest 2 is torsionally deformed by the pressing force (body pressure) of a person sitting there. However, if the engaging protrusions 28b and the engaging pieces 29b are arranged between the adjacent second ribs 27 as in the embodiment, the back frame 15 is twisted. Even with the deformable configuration, there is the advantage that the edge members 28 and 29 can be held firmly connected to the side member 17 and the upper member 18 .

In addition, since the upper horizontally long edge member 29 is formed with an overhang portion 29e projecting backward from the upper member 18, the back support sheet material 16 can be slidably moved with respect to the upper member 18, but the back support sheet material 16 can be slidably moved with respect to the upper member 18. Due to the relative sliding movement of the receiving sheet material 16 and the upper member 18, the backrest 2 is allowed to undergo a large torsional deformation.

The present invention can be embodied in various ways other than the illustrated embodiments. For example, each member that constitutes the back frame can be formed in a channel shape such as a U-shape that is open rearward.

The present invention can be embodied in the back of a chair. Therefore, it can be used industrially.

2 backrest 3 back frame 11 back support 12 upper support 13 lower support 15 back frame 16 back receiving sheet material 16a edge 16b edge extension 17 side member 18 upper member 19 lower member 17a, 18a, 19a front plate 17b, 18b, 19b inner peripheral plate 28 vertically elongated edge member 28 vertically elongated edge member 28c head (claw portion)
28e Front edge portion 28a Band plate 28b Engagement protrusion 29 Horizontal edge member 29a Band plate 29b Engagement piece 30 Cut-out portion 31 Fitting hole 32 Engaging hole 33 Engaging claw

Claims (3)

A back frame that is open in the front and rear, a mesh-like back support sheet material in which an edge portion that is arranged to overlap the back frame from the front is wound from the outer periphery to the inner periphery of the back frame, and the back support. an elongated edge member secured to the edge of the sheet material and attached to the inner periphery of the back frame;
a backrest having
The edge member includes a band plate overlapping the inner peripheral surface of the back frame, and a group of engaging projections projecting from the band plate toward the outer peripheral side of the back frame. It is formed in a hook shape or mushroom shape with a head at the tip,
the engagement protrusion of the edge member is fitted from behind into a cutout formed in the back frame so as to open rearward,
and the backrest sheet material entirely covers the back frame from behind,
the back of the chair. The backrest sheet material is fixed to the inner surface of the strip plate that does not overlap the back frame, and
By winding the edge of the backrest sheet material up to the surface of the band plate that overlaps the back frame, the edge member is covered with the backrest sheet material in an invisible state.
A chair back as claimed in claim 1. A back frame that is open in the front and rear, a mesh-like back support sheet material in which an edge portion that is arranged to overlap the back frame from the front is wound from the outer periphery to the inner periphery of the back frame, and the back support. vertically elongated edge members fixed to the left and right sides of the sheet material; and horizontally elongated horizontally elongated edge members fixed to the top and bottom of the backrest sheet material;
a backrest having
The vertically elongated edge member is composed of a band plate that overlaps the inner peripheral surface of the upper and lower longitudinal side members of the back frame, and a group of engaging projections that protrude from the band plate toward the inside of the side member of the back frame. has been
The engaging projection is formed in a hook shape or mushroom shape having a head at the tip of the boss,
The side member of the back frame is formed with a cut-out portion into which the boss of the engaging projection is inserted and engaged so as to open rearward,
The laterally long edge member is composed of a band plate that overlaps the inner peripheral surface of the left and right longitudinal upper member or lower member of the back frame, and a group of plate-like engaging pieces projecting outward in the vertical direction from the band plate. has been
An engagement hole is formed in the engagement piece, and the upper member and the lower member of the back frame are provided with an engagement hole into which the engagement piece enters and an engagement hole in which the engagement piece is fitted . A dowel is formed,
the back of the chair .

Images