JP2019083956A - Chair - Google Patents

Abstract

To provide a backrest which has a mesh and can change a hold state of a sitter's body in a structure in which the body can be appropriately supported in a non-rocking state and a rocking state.SOLUTION: A backrest 2 is a structure where a mesh material 11 is stretched over a back frame 9. A chevron-shaped part 11a of the back frame 9 can rotate horizontally. A middle member 14 of the back frame 9 is connected to a back column 8; a lower member is joined to a seat outer shell 16c which is vertically rotatable. To a pad support 23 joined to the middle member 14 and the lower member 13, a lumber pad 22 is fitted. In a non-rocking state, there is a gap 3 between the mesh material 10 and the lumber pad 22. Even when tension of the mesh material 10 when rocking decreases, a sitter's body is appropriately supported by the lumber pad.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a chair.

  As one type of chair, for example, in the case of a backrest, there is a type in which a mesh material is stretched on a back frame (back frame) opened at the front and back (i.e., a chair of mesh specification). This type has an advantage of excellent breathability and an advantage of excellent cushioning properties because the mesh material is stretched and deformed by the body pressure of the seated person. There is also an advantage of giving a visually light impression.

  In this type of mesh-type chair, Patent Document 1 is perpendicular to the upper end of the chevron portion as a form having a back frame projecting left and right outside in a front view and having left and right chevron portions projecting forward in a side view. It is disclosed to be configured to be bent around a central axis and configured to be bent around a horizontal axis (therefore, the peak portion is a deformation allowance portion). ).

  In this patent document 1, when the mesh material is pushed by the waist of the seated person in the non-locking state, the left and right chevrons move in a direction to wrap the seated person by pulling the mesh material. Therefore, when the seated person holds his upper body upright and performs tasks such as PC operation, the stability of the body can be improved. That is, the hold function (holding function, wrapping function) of the seated person by the mesh material is improved.

  In Patent Document 1, the lower end of the back frame is connected to the rear end of the seat, and when locking, the mesh material is pulled in the vertical direction (longitudinal direction) due to the relationship between the movement of the seat and the motion of the back frame And, there is a possibility of slack in the vertical direction. When the mesh is pulled in the vertical direction, the left and right chevrons tend to spread outward, lifting the seater's waist. Therefore, the seated person's body becomes stretched. When the mesh material sags up and down during locking, the mesh material promotes a tendency to wrap around the body.

  On the other hand, a lumbar support function is also provided to a mesh type backrest. For example, in Patent Document 2, a lumbar guide body is attached to a back support attached to a back frame to make a lumbar guide. It is disclosed to adjust the height of the lumbar pad on the body. In this patent document 2, the lumbar guide body is curved in a forward convex shape in a side view.

JP-A-2015-519111 (in particular, FIGS. 5 to 8) Japanese Patent Publication No. 2008-506486

  In the case of Patent Document 1, the support state of the body by the mesh material is forcibly changed by the pressure and the locking of the seated person. Such a mechanism has not heretofore been available, and it can be said that the comfort can be greatly improved.

  However, when the present inventors examined, room for improvement was found. For example, in Patent Document 1, the chevrons of the back frame are bent at the upper and lower three locations, but the mesh material is only supported by the back frame, so if the mesh material becomes loose during locking, It is feared that the body sinks too much and impairs the comfort.

  In this regard, it is conceivable to provide a lumbar support device as disclosed in Patent Document 2 and to support the body with the lumbar pad even in the locking state. However, when the back support and the backrest move relative to each other as in Patent Document 1, when the lumbar pad is attached to the back support as in Patent Document 2, the distance between the lumbar pad and the mesh material changes. No. 2 can not be applied to Patent Document 1.

  Therefore, as a means to give a lumbar support function to the chair of FIGS. 5-8 in patent document 1, it is possible to attach a lumbar pad to the side member of a back frame via a bracket, but in this case, the side member Because of the deformation, the lumbar pad can not be held stably, and therefore can not have the lumbar support function. After all, with regard to the chair shown in FIGS. 5 to 8 of Patent Document 1, it is difficult to provide the lumbar support function by the conventional means.

  The present invention has been made under such circumstances, and is intended to provide a chair with a mesh backrest in an improved configuration. In addition, the present application discloses many novel structures that have not been made before, and it may be an object to provide a chair including these structures.

The chair of claim 1 is
"I have a seat and backrest,
The backrest has a back frame of a front and rear opening, and a mesh material attached to the back frame, and the back frame is a rigid portion connected to the back post so as to be able to tilt back and forth, and a seated person It has left and right deformable parts that can be pivoted toward and away from each other,
The deformation allowing portion can be rotated by a change in tension of the mesh material. "
It is the basic composition of.

  Then, in the above basic configuration, the lumbar pad supporting the seated person's waist or the vicinity thereof via the mesh material supports the body pressure of the seated person in a state where the rotation of the deformation permitting portion of the mesh material is permitted. Is located in In the present invention, the mesh material means a material having flexibility and strength to support the body of a seated person, such as a woven fabric or a knitted fabric. It may be a single layer product or a multilayer product.

The present invention can be developed in various ways. As an example, in claim 2, in claim 1,
“In the state where the body pressure of the seated person is not acting on the mesh material, there is a space between the mesh material and the lumbar pad, and the mesh material is deformed by the body pressure of the seated person and then the seated person is seated. Body pressure is supported by the lumbar pad "
It has the composition.

The invention of claim 3 is characterized in that, in claim 1 or 2,
"The backrest is free to tilt back against the spring means, and behind the mesh material, the lumbar pad tilts back together with the backrest when the backrest is reclining, against the same It is arranged to move relatively forward "
It has the composition.

The invention of claim 4 is any one of claims 1 to 3 wherein
"A retro-tiltable back post for supporting the backrest from behind, and a base portion to which the seat and back post are attached, the lower end of the back frame is the back end of the base portion or the back end of the seat While being linked to
The lumbar pad is attached to an upper and lower pad support, and the upper end of the pad support is connected to the vicinity of a connection with a back support in the back frame or connected to the upper end of the back support. The lower end of the support is connected to the lower end of the spine frame "
It has the composition.

  The invention according to claim 5 is characterized in that, in claim 4, the pad support is curved so as to project forward as a whole in a side view as a whole, and can be bent and deformed so as to allow a change in the side view shape of the back frame. It has become.

The invention of claim 6 is the same as in claim 4 or 5
"The back frame is connected to a portion below the upper member of the left and right side members, the side members constituting the left and right sides, the upper member constituting the upper end, the lower member constituting the lower end, The middle member has a middle member, and the middle member constitutes the rigid body portion,
Of the side members, a portion below the connecting portion with the middle member protrudes outward in a front view and is a forwardly projecting chevron portion in a side view, and the chevron portion is the deformation allowing portion And when the seating pressure of the seated person acts on the mesh material, the chevron rotates toward the seated person,
The upper end of the back support and the upper end of the pad support are connected to the lower end of the middle member. "
It is said that.

Claim 7 is an independent invention,
"A seat and a back tiltable backrest, a back tiltable back post for supporting the backrest from behind, and a base portion to which the seat and back post are attached;
The backrest has a back frame of front and rear openings, and a deformable mesh material attached to the back frame.
The lower end of the back frame is connected to the rear end of the base portion or the rear end of the seat,
A lumbar pad for supporting the seated person's waist or near via the mesh material is disposed via a pad support, and the upper end of the pad support may be near the joint with the back support in the back frame Alternatively, the upper end of the back support is connected to the lower end of the pad support, and the lower end of the pad support is connected to the lower end of the back frame. "
It is said that.

  In the present invention, the body pressure of the seated person can be supported by the lumbar pad while allowing the rotation of the deformation allowing portion. Therefore, the lumbar pad of the seated person can be properly supported from behind by the lumbar pad without interfering with the function of wrapping the seated person at the deformation permitting portion.

  As a structure for supporting the seat occupant with the lumbar pad while allowing the deformation allowing portion to pivot, it is also possible to adopt a configuration in which the lumbar pad is moved backward against the spring means, as in claim 2 If a space is provided between the mesh material and the lumbar pad in a state where the physical pressure of the seated person is not applied to the mesh material, there is an advantage that the structure can be simplified.

  The lower end of the back frame is directly or indirectly connected to the rear end of the seat so that at least the rear end of the seat is lowered according to the weight of the seat occupant. The lumbar pad can be configured to retract in proportion to the downward movement of the rear end of the seat. In this case, since the pressing force on the mesh material is proportional to the physical size (weight) of the seat occupant, the amount of retraction of the mesh material is proportional to the weight of the occupant, but the weight of the occupant is heavy. Since the mesh material becomes large, the mesh material can be appropriately supported by the seated person's lumbar pad while being deformed according to the seated person's weight.

  Although the configuration of claims 3 and 4 is applied to a chair having a locking function, even if the mesh material such as a mesh material tends to sag during locking, the seated person's body is a lumbar guide via a lumbar support. Because the mesh material is supported by the frame, it is possible to prevent the mesh material from being excessively stretched and to ensure the stability of the body. Therefore, a comfortable locking state can be ensured.

  Although many mechanisms for moving the lumbar pad relative to the backrest at the time of locking are assumed, when the configuration of claim 4 is adopted, the relative position between the pad support and the back support allows the seat to be locked by the lumbar pad. It can be easily realized that the body of the person is properly supported. Furthermore, when the configuration of claim 5 is adopted as the support means for the lumbar pad, the lumbar pad can be moved back and forth by bending deformation of the pad support, so that the structure can be further simplified.

  Although various shapes can be adopted for the back frame, if a chevron portion is provided as the deformation permitting portion as in claim 6, the feeling of pressure can be eliminated and the feeling of use of the seated person can be improved. In addition, it is possible to easily realize that the angled portion is deformed into a non-varied state by means as in Patent Document 1 or means as in the embodiment of the present application. Therefore, it is excellent in practicability.

  According to the sixth aspect of the present invention, although the upper part of the backrest is located above the connection part with the back post, when the seated person stretches the upper body greatly in the locking state and strong body pressure is applied to the upper part of the backrest. The backrest has a tendency to tilt backward around the connection with the back support. In other words, after the backrest is generally inclined rearward, a double locking function is further exhibited, in which the backrest and the connection portion are used as a fulcrum to incline backward. Therefore, it is possible to improve the relaxation function by increasing the back tilt angle of the backrest.

  And although the double locking function itself is also provided with FIGS. 5-8 of Patent Document 1, in the present application, since the pad support pivots with the backrest, the backrest is properly supported by the lumbar pad. Can be double locked. Therefore, the depression of the body can be suppressed and the comfort can be improved.

  It can be said that the hold function (holding function) of the seated person by the deformation allowing portion can be improved when the vertical distance between the back frames is narrowed along with the deformation of the deformation allowing portion such as the chevron portion. In this case, if the vertical interval of the back frame is narrowed, the tension of the mesh material may decrease or slack may occur. However, according to the fifth aspect, the degree of bending of the pad support is accompanied by the narrowing of the vertical interval of the back frame. The lumbar pad tends to move forward because Therefore, even if the tension of the mesh material is lowered or slackened, the upper body of the seated person can be properly supported in a stretched state. Therefore, it is possible to further improve the support of the seated person's body and significantly improve the commercial value of the chair.

  As a means for arranging the pad support while allowing the space between the upper and lower back frames to narrow, the pad support has a lower member instead of the bendable and deformable structure as in the fourth aspect. It is also possible to slidely attach to it.

  As in the embodiment, when the lumbar pad has a height adjustable structure, the product value can be further improved because it can correspond to the preference of the user.

  The invention of claim 7 is also applicable to a chair not provided with a deformation permitting portion, and has the same features as in claim 4. Therefore, also in this chair, the body can be properly supported in the non-locking state or the locking state.

It is a figure which shows embodiment, (A) is the whole perspective view seen from the front, (B) is a partially omitted side view, (C) is a front view of the lower corner part of a back frame. (A) is a separation perspective view, (B) is a partial separation perspective view of a mesh material and a side cover. (A) is a front view, (B) is a rear view. (A) is a plan view and (B) is a perspective view seen from behind. (A) is a longitudinal side view centering on the seat portion, (B) is a view seen from the Y direction of FIG. 1 (C), FIG. 7 (A) and FIG. 9 (A), and (C) is the same Y It is the separation view seen from the direction. (A) is a separation perspective view of a back, (B) is a partial perspective view of a hinge part. (A) is a front view showing a framework of the back, (B) is a perspective view in a state in which a back frame is laid, and (C) is a partial front view of a side member. (A) is an exploded perspective view, (B) is a perspective view of the upper corner portion of the spine frame. (A) is a separation front view of a back frame, (B) is a rear view of a side cover, (C) is a rear view of a lower cover. (A) is a separation perspective view of a back frame and a side cover (a side cover is turned over), (B) is a partial front view of an edge of a mesh material. 7A is a sectional view taken along the line A-A in FIG. 7C, FIG. 7B is a sectional view taken along the line B-B in FIG. 7C, and FIG. 7C is a sectional view taken along the line C-C in FIG. It is. 7D is a cross-sectional view taken along the line DD in FIG. 7C, FIG. 7E is a cross-sectional view taken along the line E-E in FIG. 7C, and FIG. 7F is a cross-sectional view taken along the line F-F in FIG. It is. It is a vertical front view centering on a lumbar support part. (A) is a detailed view of the portion pointed by arrow A in FIG. 13, (B) is a detailed view of the portion pointed by arrow B in FIG. 13, and (C) is a detailed view of the portion pointed by arrow C in FIG. It is. (A) is an exploded perspective view of the back support and the back frame viewed from below, (B) is an exploded perspective view of the connection portion of the back support and the back frame viewed from the back, (C) is the back support and back frame FIG. 6 is an exploded perspective view from the front of the connecting portion with (A) and (B) are the separation perspective views which looked at a back pillar and a back frame from the lower part, (B) is a perspective view of a middle member in the state where a lumbar guide body attached. (A) is an exploded perspective view of the lumbar support device as viewed from the front, (B) is an exploded perspective view of a portion of the lumbar support device as viewed from the rear, (C) is a partial front view of the lumbar guide body, D) is a rear view of the lock body. (A) and (B) are the partially omitted isolation perspective views which looked at the lumbar support apparatus from the front, and (B) is a partial perspective view of a lumbar support apparatus. (A) is a partial perspective view of the lumbar support device, (B) is a perspective view of the lumbar pad separated from the lumbar frame, and (C) is a rear view of the lumbar pad. (A) is a powder perspective view of the lumbar frame, (B) is a separated perspective view of the lumbar frame and the connecting bar, (C) is a C-C in FIG. 11 (C) with the lumbar pad attached to the lumbar frame. FIG.

(1). Overview Next, an embodiment of the present invention will be described based on the drawings. First, the outline of the chair will be described mainly based on FIGS. In the present application, the terms front and rear and left and right are used to specify the direction, but this direction is based on a state viewed from a person who is normally seated in the chair. Front view is a direction facing the seated person.

  The present embodiment is applied to a rotating chair that is frequently used in the office. This chair comprises a seat 1, a backrest 2 and a castered leg arrangement 3. The leg device 2 has a leg support 4 composed of a gas cylinder, and as shown in FIG. 1B (see also FIG. 5A), a fixed base constituting a base portion at the upper end of the leg support 4 5 is attached.

  The movable base 6 is connected by a left and right long first shaft 7 to a portion of the fixed base 5 in front of the leg support 4 (in fact, the first shaft 7 is not visible in a side view). 5 (A)). The back support 8 is fixed to the rear end of the tilting base 6). Therefore, the back support 8 tilts backward with the first shaft 7 as a fulcrum. The back support 8 may be made of resin or metal such as an aluminum die cast product. The tilting base 6 is also made of metal or resin.

  The backrest 2 has a structure in which a mesh material 10 is stretched on a back frame 9 that opens in the front and back. The back frame 9 is made of synthetic resin, and includes upper and lower long left and right side members 11, an upper member 12 integrally connected to the upper end thereof, lower members 13 connected to the left and right side members 11, and left and right side members 10. And a middle member 14 connected to the upper part. The middle member 14 is V-shaped in a front view, and the lower end portion 14 a of the middle member 14 and the upper end portion of the back support 8 are connected by the left and right long second shafts 15.

  As shown in FIG. 2A, the seat 1 is attached to the seat outer shell 16. The seat outer shell 16 includes a main seat outer shell 16a, a front seat outer shell 16b mounted so as to be slidable back and forth in the front part thereof, and a left and right long third shaft 17 at the rear end of the main seat outer shell 16a. The main seat outer shell 16 a is fixed to the seat receiving body 18, and is configured of a pivotable rear seat outer shell 16 c connected via FIG. 5 (A).

  As shown in FIG. 2A, the front part of the seat support 18 is connected to the front end of the fixed base 5 by a left and right long fourth shaft 19 and the rear part of the seat support 18 is long and left. It is connected to the side portion 6 a of the tilting base 6 by the fifth shaft 20. Therefore, when the backrest 2 tilts backward, the seat support 18 tilts backward with the fourth shaft 19 as a fulcrum, whereby the seat 1 tilts backward in conjunction with the tilt of the backrest 2 or the like. However, the degree of backward inclination of the seat 1 is smaller than the degree of backward inclination of the backrest 2.

  The rear end of the rear seat outer shell 16 c and the lower member 13 of the back frame 9 are connected by a left and right long sixth shaft 21. And the side member 10 of the back frame 9 has the chevron 11a which protrudes in the forward direction in the side view and protrudes outward in the left and right direction in the front view as an example of the deformation allowing portion described in the claims. The chevron portion 11a is deformable so as to change the side view posture and the front view posture. Note that the deformation allowing portion embodied as the mountain-shaped portion 11a can also be called a turning portion or a holding portion.

  That is, when the body pressure of the seated person is applied to the mesh material 10 in the non-locking state as shown by the outlined arrow in FIG. 1B, the chevron portion 11a is pulled by the mesh material 10 Pivot inward in the direction to hug. Therefore, the holdability of the body by the backrest 2 is enhanced, and the body stability of the seated person is enhanced. Therefore, the chevron portion 11a can also be called a body holding portion.

  The backrest 2 is provided with a lumbar support device. The lumbar support device has a lumbar pad 22 for supporting the lower back of the seated person through the mesh material 10, and a pad support 23 to which the lumbar pad 22 is height-adjustable mounted. The upper end of the pad support 23 is The lower end of the pad support 23 is connected to the lower member 13, which is connected to the connecting portion between the middle member 14 and the back support 8. Moreover, the pad support 23 is loosely curved as a whole so as to protrude to the front in a side view. The pad support 23 can also be called a lumbar guide body.

  In the non-locking state where the seated person is not leaning against the backrest 2, assuming that the posture of the rear seat outer shell 16c is constant, no external force in the vertical direction acts on the pad support 23. Therefore, when the seated person or the body hits the mesh material 10, the longitudinal position of the lumbar pad 22 does not change, and the body pressure of the seated person is supported via the mesh material 10.

  On the other hand, when the chevron portion 11a is deformed inward, the lower member 13 may be lowered, and the rear seat outer shell 16c may be tilted backward by the weight of the seated person. In this case, the lumber pad 22 is retracted by pulling the pad support 23 downward, and the amount of retraction of the lumber pad 22 is proportional to the physical size (weight) of the seat occupant.

  Therefore, when the weight of the seat occupant is large, the mesh material 10 is largely dented backward and deformed to increase the inward rotation amount of the chevron 11c, but since the lumbar pad 22 recedes in proportion to the weight of the seat occupant, The occupant's body can be properly supported by the lumbar pad. That is, by retracting the lumbar pad 22 in proportion to the amount of extension of the mesh material 10, the body of the seated person can be properly supported even in the non-locking state. The downward movement of the lower member 13 may be performed only by the deformation of the chevron portion 11a, or may be performed only by the backward tilting of the rear seat outer shell 16c (the backward tilting of the rear end of the seat 1).

  When the backrest 2 tilts backward, the second shaft 15 retreats and descends, and the sixth shaft 21 also descends. Therefore, although it changes with the space | interval of the 2nd axis | shaft 15 and the 6th axis | shaft 21, in this case, there are a case where a space | interval expands and a case where a space | interval narrows, In this embodiment, the space | interval is narrow.

  Therefore, the mesh material 10 becomes slack at the time of locking, but when it narrows at the distance between the second shaft 15 and the sixth shaft 21, the degree of bending of the pad support 23 becomes large and the lumbar pad 22 is pushed forward. Works. Thereby, it can prevent that mesh material 10 slacks too much. As a result, it is possible to prevent the holding property to the body from becoming excessively high. Further, when the tension on the mesh material 10 is lowered by the locking, the chevrons 11a of the side members 10 tend to spread and deform to the original posture by their own elastic restoring force.

  The backrest 2 has a portion located above the upper end of the back support 8. The upper part of the backrest 2 is positioned above the upper end of the back support 8 as shown by the black outline arrow in FIG. Body pressure may act in this case, but in this case, the backrest 2 may tilt backward with the second shaft 15 as a fulcrum. That is, the backrest 2 can be further inclined backward (double locking) after the back support 8 is fully inclined. Therefore, high comfort can be ensured.

  Then, when the backrest 2 tilts backward with the second shaft 15 as a fulcrum, the lower end of the back frame 9 tries to pivot forward, but the lower end of the back frame 9 is restricted by the sixth shaft 21 so as not to be able to move forward. Therefore, the chevron 11a of the spine frame 9 spreads outward and tries to deform. In addition, when the backrest 2 tilts backward, the pad support 23 is deformed to increase the degree of bending, as shown by the black arrow in FIG. 1 (B). As a result, the lumbar pad 22 tends to move forward, and the lumbar of the seat occupant is firmly supported.

  After all, the backrest 2 can perform the primary locking by the backward tilt of the back support 8 and the secondary locking in which only the backrest 2 reverses after the back support 8 is fully inclined, but the lumbar pad 22 In order to move forward, the upper body of the seat occupant can be properly supported to ensure high comfort.

(2). Structure of Seat and Base In the following, each part will be described. First, the seat and the base will be described. As can be understood from FIG. 2A, the tilting base 6 has side portions 6a located on the left and right sides of the fixed base 5, and the front end portion of the side portion 6a is connected to the fixed base 5.

  As shown in FIGS. 2 (A) and 5 (A), the seat receiving body 18 has left and right longitudinal portions constituting its front portion, and front and rear longitudinal portions positioned on the left and right sides. The longitudinal portion is connected to the fixed base 5 via a bracket 25. In addition, a front and rear longitudinal portion is connected to the tilting base 7 by a fifth shaft 20.

  The outer shell 16 is formed with a number of reinforcing ribs. A seat inner shell 26 is disposed on the seat outer shell 16, and a cushion material 27 (see FIG. 5A) is stretched on the seat inner shell 26. The cushioning material 27 is covered with a skin material (not shown), and the skin material is fixed to the seat inner shell 26. Therefore, although the seat 1 is composed of the seat inner shell 26 and the cushion material 27, it is possible to view the seat outer shell 16 as a part of the seat 1.

  The seat inner shell 26 has a main seat inner shell 26a fixed to the main seat outer shell 10, and a front deformation portion 26b which can be wound and deformed downward is integrally connected to the front end of the main seat inner shell 26a. There is. The front end of the front deformation portion 26b is connected to the front end of the front seat outer shell 16b. Therefore, when the front seat outer shell 16b is moved back and forth, the front end of the front deformation portion 26b can be rolled back and forth downward, and the front end position of the seat 1 can be adjusted. The forward and backward movement of the front seat outer shell 16b is performed by, for example, a lever 28 shown in FIG. 1 (B).

  A rear pivoting portion 26c is integrally connected to a rear end of the main seat inner shell 26a via a hinge portion, and the rear pivoting portion 26c is engaged with the rear seat outer shell 16c by an engagement means (hook means). It is connected. Therefore, the rear seat outer shell 16c and the main seat inner shell 26a rotate together. When a person is seated, the rear rotation portion 26c tilts backward according to the weight, and accordingly, the rear seat outer shell 16c can also tilt rearward.

  As shown in FIG. 5A, the rear end of the tilting base 6 and the back of the fixed base 5 extend to the rear, while as shown in FIG. 1B, the lower end of the back support 8 is the rear of the tilting base 6 A forward facing portion 8a overlapping from above is formed at the end, and the forward facing portion 8a is fixed to the tilting base 6 by a bolt (not shown).

  A locking spring is disposed inside the fixed base 5 but is omitted in the figure. The locking spring is a coil spring that expands and contracts in the front-rear direction, and the front end is supported by a front spring receiver 29 shown in FIG. 5 (A). The initial elastic force of the locking spring is adjusted by rotation of a handle provided concentric with the first shaft 7.

  In the present embodiment, the fixed base 5, the tilting base 6, the seat support 18 and the seat outer shell 16 constitute a base portion. However, as described above, the seat outer shell 16 can also be regarded as part of the seat 1. In addition, it is also possible to manufacture the tilting base 6 and the back support 8 as an integral product.

(3). Side Member of Back Frame Next, the backrest 2 will be described mainly with reference to FIGS. As described above, the backrest 2 includes the back frame 9 and the mesh material 10. The mesh material 10 is an example of the mesh material described in the claims. As shown in FIG. 10 (B) and FIG. 2 (B), an edge member 34 such as a resin tape is fixed to the outer peripheral edge of the mesh material 10 by welding or the like. The engagement holes 35 are open by jumping. The engagement holes 35 are square, but may be circular. The edge member 34 is divided into a plurality of pieces.

  As described above, the side member 11 of the spine frame 9 is provided with the chevron portion 11a, but as shown in FIG. 7A and FIG. 1A, for example, the side member 11 is on the chevron portion 11a. The part located on the mountain-shaped part 11a also protrudes left and right outside. Therefore, at the upper portion of the side member 11, there is a constricted portion 36 facing inward in a front view, and the middle member 14 is connected to the constricted portion 36.

  The upper portion of the side member 11, the middle member 14 and the upper member 12 constitute a loop body, but this loop body is a rigid body portion that basically deforms even if body pressure is applied. That is, even if it elastically deforms when it sees microscopically, it has the intensity | strength which does not deform so that a seated person senses a deformation | transformation.

  For example, as can be understood from FIG. 10 (A), the side member 11 is formed thin (plate-like) having a much smaller front and rear thickness compared to the right and left width. It deforms so that its shape changes easily. In particular, the apex 37 of the chevron 11a is thin. Therefore, the chevron portion 11 a bends particularly easily around its apex 37. In addition, the chevron portion 11a is also allowed to twist and deform around the axis. Due to the combined deformation of bending and twisting, deformation as shown by an alternate long and short dash line in FIG. 1B is allowed.

  As can be understood from FIG. 10A, a forward rib 38 is formed on a portion of the side member 11 above the apex 37. The rib 38 extends to the upper end of the side member 11.

(4). Attachment Structure of Side Cover Mesh Material A side cover 39 is fixed to the front surface of the side member 11. The side cover 39 basically has the same shape as the side member 11, but the portion above the upper half or so of the angled portion 11a has the width dimension of the side member 11 with the inner side surface shifted outward. It has a narrow width of about 60%. Thus, the narrow portion is formed in the side cover 39 in order to facilitate deformation of the side cover 39 and the side member 11.

  As shown in FIGS. 11C and 12E, the side cover 39 is fixed to the side member 11 with a screw 40. Then, between the side members 11 and the side cover 39, an outwardly opening longitudinally extending groove 41 is formed over the entire length in the vertical direction, and the edge member 34 of the mesh material 10 is fitted in the longitudinally extending groove 41 (See Figures 11 and 12).

  Thus, the side cover 39 functions as a means for forming the longitudinal groove 41 for attaching the edge member 34. Further, as can be understood from FIG. 2 (B), on the side cover 39, the engagement protrusions 42 into which the engagement holes 35 of the edge member 34 are fitted are formed to fly in the vertical direction. Therefore, the edge member 34 is held unremovably.

  Attachment of the mesh material 10 is performed in the state which fixed the side cover 39 to the side member 11 previously. Therefore, the outward facing surface of the engagement protrusion 42 is formed on the inclined surface 42 a that is directed to the inside of the back frame 9 as it goes to the tip. For this reason, when the edge member 34 is inserted into the longitudinal groove 41, the edge member 34 is guided by the inclined surface 42a and enters into the depth of the longitudinal groove 41, and when it enters completely, the elastic member returns and deforms, and the engagement hole 35 The engagement protrusion 42 is fitted. As a result, the edge member 34 is held unmovably out of the longitudinal groove 41.

  Since both the back frame 9 and the side cover 39 are injection molded of resin, they must be in a form that can be punched out. However, when the side cover 39 is provided as in the embodiment, the vertically elongated grooves 41 and the engagement projections 42 can be simplified. It can be formed.

  Now, since the tension of the mesh material 10 acts to pull the edge member 34 outward at the portion of the constricted portion 36, the edge member 34 is simply fitted into the longitudinal groove 41, the edge member 34 Is easy to remove. On the other hand, when the engaging projection 42 is formed as in the present embodiment, the edge member 34 can be held unremovably even at the constricted portion 36, so the mesh backrest 2 having the constricted portion has high quality. Can be provided. The engagement protrusion 42 may be formed on the side member 11 or may be formed on both the side member 11 and the side cover 39.

  The side cover 39 is also a part of the back frame 9, and therefore, strictly speaking, the back frame 9 should be composed of the main body and the side cover 39, but in the present application, it is convenient. The side cover 39 is fixed to the back frame 9.

  Since the side cover 39 resists bending of the back frame 9, care is taken not to inhibit the deformation of the back frame 9. That is, first, the slits 43 are formed in the side cover 39 at the location of the mountain-shaped portion 11 a so as to be easily deformed. The slits 43 are open at both the near side and the left and right outer sides. Further, as described above, by making the portion of the side cover 39 above the upper half of the mountain-shaped portion 11a narrow, deformation of the mountain-shaped portion 11a is facilitated.

  As clearly shown in FIG. 10A, the side member 11 is formed with a cylindrical boss portion 44 into which a screw 40 for fixing the side cover 39 is screwed. The cylindrical boss portion 44 is formed by thinning the rib 38 at the portion of the rib 38. The ribs 38 also play a role of defining the back surface of the longitudinal groove 41.

  A cover is not attached to the upper member 12 of the back frame 9, and as shown in FIG. 8 and FIG. 12 (F), the upper member 12 of the back frame 9 itself is a part of the attachment groove of the mesh material 10 An upper horizontal groove 45 is formed. The upper member 12 is basically set so as not to elastically deform. The upper horizontal grooves 45 and the vertical grooves 41 communicate with each other.

  For example, as shown in FIG. 8, the left and right end portions of the laterally long groove 45 are formed with the expanded groove portion 46 expanded toward the front side, while in the state of the side cover 39, the protruding portion 47 is formed in the expanded groove portion 46 ing. Therefore, the upper end of the side member 11 does not float in the front, and the mesh material 10 can be maintained in a beautiful state, and the mesh material 10 can be prevented from being torn.

(5). Connection structure of side member and lower member For example, as shown in FIG. 7 (B), the lower member 13 of the back frame 9 is in the form of a bowl having a forward opening, but a large number of reinforcements inside It has a rib and basically has a rigid structure that does not deform. Downward bracket portions 13a are formed at the left and right end portions of the lower member 13, and the bracket portions 13a are connected to the rear seat outer shell 16c by a third shaft 17 as shown in FIG. 5 (A). .

  For example, as shown in FIG. 7B, the lower member 13 and the side member 11 are connected by a pin 50 in an inclined posture. The pin 50 is inclined so as to approach the central portion of the spine frame 9 as it goes up in a front view. Therefore, when the chevron portion 11a of the side member 11 pivots about the pin 50, the chevron portion 11a changes its shape in a side view as shown by a dashed dotted line in FIG. The shape of also changes.

  Specifically, when a physical pressure of a seated person is applied to the mesh material 10, the mesh material 10 is pushed and the chevrons 11a rotate inward and the angle in a side view becomes smaller, and in a front view Is slightly deformed to be smaller. This deformation is permitted by the lower member 13 rising. In addition, the upward movement of the lower member 13 is permitted by the upward rotation of the rear seat outer shell 16c (the rear part of the seat 1 also pivots slightly upward).

  Although the pin 50 constitutes a hinge means, bearing elements 51 and 52 in which the pin 50 is fitted are provided at the lower end of the side member 11 and the left and right ends of the lower member 13 as elements of the hinge means. In the embodiment, the two bearing portions 51 are formed in the side member 11, but the relationship may be reversed. As can be understood from FIGS. 6 (B) and 7 (B), the lower bearing portion 51 of the side member 11 is located inside the outer periphery of the side member 11, and outside the lower bearing portion 51, The longitudinal grooves 41 described above are formed.

  Although the pin 50 is inserted into the bearing portions 51 and 52 from below, as can be understood from the comparison of FIGS. 5 (B) and 5 (C), removal of the pin 50 is blocked by the projection 53 provided on the side cover 39. ing.

  The lower cover 54 overlaps the lower member 13 from the front side, and the lower cover 54 is fixed to the lower member 13 by a plurality of screws 55 (see FIG. 14B). Then, boss portions 56a and 56b fitted to each other are formed at the left and right middle portions of the lower member 13 and the lower cover 54, and the lower end portion 22a of the pad support 23 is fitted into the boss portions 56a and 56b.

  Accordingly, the lower end 22a of the pad support 23 has a hole 57 that fits into the bosses 56a and 56b. The screw 55 is screwed into the lower member 13 through the bosses 56a and 56b. The bosses into which the pad support 23 is fitted may be formed on only one of the lower member 13 and the lower cover 54.

  The chevrons 11a of the side members 11 rotate frequently due to changes in the body pressure of the seat occupant. For this reason, a moment due to rotation of the chevron portion 11 a frequently acts on the connecting portion at the lower end of the side member 11. Therefore, for example, as shown in FIG. 9A, a metal plate stopper 58 in a posture orthogonal to the pin 50 is disposed in a posture to straddle the front surface of the side member 11 and the lower member 13. The stopper 58 is formed in the shape of a belt made of a resilient metal plate, and is fitted to the frame formed on the side member 11 and the lower member 13 so as not to be laterally displaced.

  One end (lower end, right end) of the stopper 58 is nondisplaceably fitted to the first boss body 59 provided in the lower member 13 so as to project forward, while the other end (upper end, left end) of the stopper 59 Is fitted to the second boss body 60 provided to project forwardly to the side member 11. Accordingly, the stopper 58 is formed with a long groove hole 61 which is slidably fitted to the second boss body 60. Although the long slot 61 is cut open, it may be a slot of a close method. Further, the stopper 58 may be connected (or fixed) to the side member 11 in a non-displaceable manner.

  The second boss body 60 is an example of a rotation restricting abutment portion, and the inward rotation of the chevron portion 11 a in the side member 11 is restricted by the second boss body 60 hitting the bottom of the long groove hole 61 in the stopper 58. Ru. In this case, since the stopper 59 is long in the direction orthogonal to the pin 50, the moment due to the rotation of the angled portion 11a is significantly alleviated.

  As shown in FIG. 1C, there is a slight gap between the lower end of the side member 11 and the left and right side ends of the lower cover 54 to allow the side member 11 to rotate, and a part of the stopper 58 Exposed from the gap. However, since the gap is covered from the front side with the mesh material 10, there is no problem with aesthetics.

  As shown in FIG. 14 (B), a lower horizontal groove 62 opened downward is formed in the mating surface of the lower member 13 and the lower cover 54, and the edge member 34 provided at the lower end of the mesh material 10 is lower horizontal. The groove 62 is inserted. Although the lower cover 54 is not provided with a locking means for the edge member 34, it is possible to provide an engagement protrusion similar to that of the side cover 39.

  In FIGS. 6B and 9A, the end portions of the edge member 34 located at the lower end portion of the side member 11 and the edge member overlapping the lower member 13 are displayed in a shaded pattern. As shown in this figure, the edge member 34 provided on the side member 11 and the edge member 34 provided on the lower member 13 are separated at both sides (both sides of the extension of the axial center of the pin 50) across the bent portion. There is.

  Accordingly, the angled portion 11a is deformed and the bending force does not repeatedly act on the edge member 34, and the durability of the edge member 34 is not reduced. Although the mesh material 10 is deformed, since the mesh material 10 is not tensioned, there is no problem that the mesh material 10 is broken during use.

  The bearing portions 51 and 52 of the side member 11 and the lower member 13 are partially exposed to the front side, but since they are covered with the mesh material 10, as in the case of the stopper 58, the aesthetic problems Does not occur.

(6). Attachment Structure of Pad Support Next, the lumbar support device will be described mainly with reference to the drawings from FIG. The pad support 23 is made of a resin or a metal plate and has a strip shape that is long in the vertical direction, and is curved toward the front in a side view as described above. To be precise, the upper part is curved. Therefore, they can be deformed by an external force applied in the vertical direction. The portion of the pad support 23 in which the lumbar pad 22 moves up and down is in a substantially linear posture in a side view.

  The lower end portion of the pad support 23 is connected to the lower member 13 as described above. On the other hand, the upper end of the pad support 23 is connected to the lower end of the middle member 14. This point will be described first.

  As shown in FIGS. 14-16, at the upper end of the back support 8, there is formed a bearing boss 65 projecting obliquely upward toward the front, while at the lower end 14a of the middle member 14, the bearing boss 65 is formed. A bearing recess 66, into which is inserted, is formed to open downward and backward. The lower end portion 14a of the middle member 14 and the bearing boss portion 65 are connected by the second shaft 15 (pin).

  The lateral width of the bearing recess 66 is larger than the lateral width of the bearing boss 65, and the spacer 67 in a side view between the left and right sides of the bearing boss 65 and the left and right inner surfaces of the bearing recess 66. , 68 are inserted. The spacers 67 and 68 are separated into two parts of large and small parts, and both are in a nested system. The small spacer 68 is made of a member having a small coefficient of friction, and abuts on the outer surface of the bearing boss 65. The large spacer 67 is rotatably held in the bearing recess 66, and the small spacer 68 is non-rotatably fitted to the large spacer 67.

  For example, as shown in FIG. 16A, the upper end 22b of the pad support 23 is bent backward, and two left and right positioning holes 68 are open in the upper end 23b of the pad support 23. On the upper inner surface of the recess 66, two left and right positioning bosses 70 fitted in the positioning holes 68 are provided to project downward. Therefore, in the present embodiment, the upper end 22 b of the pad support 23 is connected to the middle member 14.

  In the embodiment, the upper end portion 23b of the pad support 23 is irremovably held by the bearing boss portion 65 inside the bearing recess 66. Therefore, a fixing means such as a screw is not necessary, and the mounting structure can be simplified accordingly. In addition, since the pad support 23 can be formed into a curved shape in a side view by utilizing the fact that the upper end portion 23b is intruded into the bearing recess 66, ease of deformation can also be ensured.

  Although one positioning hole 68 and one positioning boss 70 may be provided, forming two right and left holes is advantageous in that the stability of the pad support 23 can be improved. Further, although the positioning holes 68 and the positioning bosses 70 are formed to be long in the front and back direction, this form also contributes to the attitude stability of the pad support 23. Of course, the positioning hole 68 and the positioning boss 70 can be formed in various shapes such as a circle or a square.

  The second shaft 15 penetrates the lower end portion 14 a of the middle member 14. Accordingly, at the lower end portion 14a of the middle member 14, a pin hole 71 into which the second shaft 15 is fitted is open. Therefore, the center cover 72 is attached to the lower end portion 14 a of the middle member 14, and the pin holes 71 are covered from the left and right sides by the left and right end portions 72 a of the center cover 72. Thus, the second shaft 15 is held in a non-removable manner. For example, as clearly shown in FIG. 16, the lower end portion 14a of the middle member 14 is formed with a recess 73 in which the left and right end portions 72a of the center cover 72 are fitted.

  The center cover 72 is formed in a gate shape in a front view so as not to interfere with the pad support 23. For example, as shown in FIG. 14A, the upper end of the center cover 72 is formed with an engagement piece 72b that enters the bearing recess 67, and the claw 75 formed on the engagement piece 72b is a bearing recess 66. Is engaged with the engagement bar 76 provided on the

  Since the upper end edge of the center cover 72 is in contact with the upper surface of the bearing recess 66, the center cover 72 is held so as not to be removable. The attachment of the center cover 72 is performed using the deformation of the engagement piece 72b. The engagement bar 75 also functions to restrict upward movement of the upper end 22 b of the pad support 23.

(7) Lumber Pad and Lifting Mechanism For example, as shown in FIGS. 19 and 20, the lumbar pad 22 is made of a soft resin such as an elastomer, and is formed laterally long. Also, the left and right ends are rounded. The lumbar pad 22 is attached to a lumbar frame 80 disposed behind it. The lumbar frame 80 is curved so as to be concave toward the front in plan view, and the left and right portions are open. Therefore, it is in the form of glasses (though it does not have to be open).

  While the lumbar frame 80 is largely curved in plan view, the lumbar pad 22 is substantially flat. Therefore, only the left and right ends of the lumbar pad 22 are attached to the lumbar frame 80 in a state of supporting both ends. As the attachment structure of the lumbar pad 22, for example, as shown in FIGS. 19 (B) and (C) and FIG. 20, the engagement claws 81 projecting outward in the lumbar frame 80 are formed in multiple stages. There is formed a pocket 82 into which the engaging claw 81 is inserted.

  For example, as clearly shown in FIGS. 20A and 20C, the lower end of the lumbar frame 80 is connected by a joint bar 83. The joint bar 83 is formed with a hook portion 84 engaged with the lowermost engagement claw 81 in a hooked manner. The presence of the joint bar 83 prevents the spread deformation of the lumbar frame 80. The lumbar pad 22 may be stretched and deformed so as to be recessed rearward when pressure is applied to the body of the seat occupant.

  For example, as shown in FIGS. 17 and 18, a guide wall 85 made of a group of ribs is formed at the left and right middle portions of the lumbar frame 80, and the pad support 23 is held between the left and right guide walls 85. A raising and lowering guide 86 is provided. The pad support 23 is located on the front surface of the lifting guide 86, and the lifting guide 86 is provided with left and right engagement claws 87 located on the front side of the pad support 23.

  The lower end of the engagement claw 87 is a free end, and the lower end is an inwardly projecting chevron. On the other hand, on the pad support 23, left and right asperities 88 are protrusively provided so as to be engaged and disengaged by the engagement claw 87 being deformed against the elasticity thereof.

(8) Locking mechanism of lumbar pad Further, a locking body 89 is disposed in front of the lift guide 86, and the locking body 86 is fixed to the guide projection 85 of the lumbar frame 80 by the left and right screws 90. ing. A certain distance (several mm) is provided between the lock body 86 and the elevation guide body 86, and the lock body 89 and the lumbar frame 80 move back and forth by a certain size with respect to the elevation guide body 86 and the pad support 23. It can move.

  Further, as shown in FIGS. 18B and 18C, right and left springs (coil springs) 91 are disposed between the lock body 86 and the elevation guide body 86. Therefore, the lock body 86 is urged in a direction away from the lift guide body 86 and the pad support 23, and when the pressure of the seated person is applied to the lumbar pad 22, the lock body 86 closely contacts the pad support 23. A spring bearing 92 is formed on the lock body 86 and the elevation guide body 86. The coil spring 91 may be purchased and another elastic body such as rubber may be used.

  Then, as can be understood from, for example, FIG. 18A and FIG. 17C, on the pad support 23, on both sides sandwiching the longitudinal center line, lock grooves 93 in a side view rectangular shape consisting of forward ribs are formed in another step. While forming, as shown in FIG. 18A and FIG. 17D, on the rear surface of the lock body 86, the longitudinally extending rib 94 positioned between the left and right engaging grooves 93 and the outwardly directed from the longitudinally elongated rib 94 The upper and lower lock claws 95 are formed.

  The vertical pitch of the lock groove 93 is the same as the pitch of the uneven portion 88, and the distance between the upper and lower lock claws 95 is an integral multiple of the pitch of the lock groove 93 and the uneven portion 88. When the lock claw 95 and the lock groove 93 are fitted, the lumbar frame 80 and the lumbar pad 22 are held so as not to move vertically.

  On the other hand, since the lock claw 95 is separated from the lock groove 93 in a state where the pressure of the seated person is not applied to the lumbar pad 22, the engagement claw 87 may be elastically deformed to be adjusted to any height. It takes place with light power. Therefore, in the present embodiment, the lumbar pad 22 can be reliably prevented from being shifted due to the body pressure of the seated person without impairing the ease of height adjustment.

  The upper end of the pad support 23 can also be connected to the bearing boss 65 of the back support 8. Although the lumbar pad 22 is attached to the lumbar frame 80 in a state of being supported at both ends, the lumbar frame 80 may be integrally formed with left and right body receiving portions. In this case, the lumbar frame 80 and the lumbar pad 22 are integrated. Various other structures can be adopted for the height adjustment mechanism and the locking mechanism of the lumbar pad 22.

  In the present embodiment, the chevron portion 11a is formed on the side member 11 to form a deformation allowing portion, but it is also possible to adopt a form in which the left and right side portions of the backrest rotate horizontally over the entire height. Moreover, when providing a deformation | transformation allowance part in a part of backrest, it is also possible to set it as the form of not square shape but square, a trapezoid, etc. (However, a trapezoid can be regarded as a kind of yamagata).

  Further, as means for deforming the deformation allowing portion, it is possible to adopt three hinge portions as in Patent Document 1 or bending at the upper and lower hinge portions which rotate around the vertical axis. It is possible (in this case, the bending angle in the side view does not change).

  Furthermore, various forms of lumbar pads and pad supports can be adopted as long as the functions are provided. For example, the pad support may be in the form of a pipe or a bowl (the pad support may be configured by two members on the left and the right).

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

Reference Signs List 1 seat 2 backrest 5 fixed base constituting the base portion 6 tilting base constituting the base portion 7 first shaft serving as the pivot point of the back support 8 back support 9 back frame 10 mesh material (body support material)
11 side member 11a chevron part 12 as a deformation allowance part upper member 13 constituting a rigid body part 13 lower member 14 middle member constituting a rigid body part 15 second axis 16 seat outer shell constituting a base part 22 lumber pad 23 pad support 65 Bearing boss part provided on the back post 66 Bearing recess provided on the lower end part of the middle member

Claims (7)

It has a seat and a backrest.
The backrest has a back frame of a front and rear opening, and a mesh material attached to the back frame, and the back frame is a rigid portion connected to the back post so as to be able to tilt back and forth, and a seated person It has left and right deformable parts that can be pivoted toward and away from each other,
The deformation allowing portion can be rotated by a change in tension of the mesh material,
A lumbar pad supporting the seated person's waist or the vicinity thereof via the mesh material is arranged to support the body pressure of the seated person while allowing the deformation allowing portion of the mesh material to rotate.
Chair. In a state where the body pressure of the seated person is not acting on the mesh material, a space is provided between the mesh material and the lumbar pad, and the mesh material is deformed by the body pressure of the seated person before the seated person's Body pressure is supported by the lumbar pad,
A chair according to claim 1. The backrest is free to tilt back against the spring means, and behind the mesh material, the lumbar pad is relative to the backrest while being tilted back together with the backrest when the backrest is tilted backward. Are arranged to move forward
A chair according to claim 1 or 2. The apparatus further comprises a back tiltable back support for supporting the backrest from behind, and a base portion to which the seat and the back support are attached, the lower end of the back frame being the rear end of the base portion or the rear end of the seat. While connected,
The lumbar pad is attached to an upper and lower pad support, and the upper end of the pad support is connected to the vicinity of a connection with a back support in the back frame or connected to the upper end of the back support. The lower end of the support is connected to the lower end of the spine frame,
The chair described in any one of Claims 1-3. The pad support is generally curved in a forwardly projecting state in a side view as a whole, and can be bent and deformed so as to allow a change in a side view shape of the back frame.
The chair described in Claim 4. The back frame is a middle member connected to a portion below the upper member of the left and right side members, side members constituting left and right side portions, an upper member constituting an upper end portion, a lower member constituting a lower end portion, and And the middle member constitutes the rigid body part,
Of the side members, a portion below the connecting portion with the middle member protrudes outward in a front view and is a forwardly projecting chevron portion in a side view, and the chevron portion is the deformation allowing portion And when the seating pressure of the seated person acts on the mesh material, the chevron rotates toward the seated person,
The upper end of the back support and the upper end of the pad support are connected to the lower end of the middle member.
The chair described in Claim 4 or 5. A seat and a back tiltable backrest, a back tiltable back support for supporting the backrest from behind, and a base portion to which the seat and back support are attached;
The backrest has a back frame of front and rear openings, and a deformable mesh material attached to the back frame.
The lower end of the back frame is connected to the rear end of the base portion or the rear end of the seat,
A lumbar pad for supporting the seated person's waist or near via the mesh material is disposed via a pad support, and the upper end of the pad support may be near the joint with the back support in the back frame Alternatively, the pad support is connected to an upper end of the back support, and a lower end of the pad support is connected to a lower end of the back frame.
Chair.

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