JP2019083955A - Body pressure support of chair and backrest as example - Google Patents

Abstract

To prevent a mesh material from coming off during use in a backrest with the specifications of a mesh.SOLUTION: A backrest 2 has a structure of a back frame 9 with a mesh material 10 stretched, and the side member 11 of the back frame 9 is provided with a chevron part 11a and a constricted part 36. On the front face of the side member 11, a side cover 39 is fastened with screws and, on the mating face of the side member 11 and the side cover 39, there is formed a longitudinal groove in which an edge member 34 fastened on the mesh material 10 is inserted from the outside. In the side cover 39, there is formed an engaging projection 42 on which an engaging hole 35 formed on the edge member 34 is fitted. Consequently, even if the backrest has the constricted part 36 (inward curved part), the edge member 34 is held with no possibility of coming off.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a pressure support of a chair or back as an example thereof. Seats, head rests, shoulder rests and the like can be mentioned as body pressure supports other than the backrest.

  As one type of chair, for example, there is a type (i.e., a chair with mesh specification) in which a back material is stretched on a back frame (back frame) opened in the front and back direction. 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.

  As an example of this type of mesh type chair, in FIGS. 5 to 8 of Patent Document 1, approximately lower half portions of left and right sides of the back frame are projected to the left and right outside in a front view and forward in a side view A configuration is disclosed in which the chevron portion is pivoted to the side of the seated person when the pressure of the seated person is applied to the mesh material. Further, in Patent Document 1, upper portions of left and right side portions of the backrest also project outward in a front view, and therefore, the back frame is formed with a constricted portion which enters into the left and right sides.

  Although various proposals have been made as a method for attaching the mesh material to the back frame, a groove of an outward opening is formed on the outer periphery of the back frame, and a tape-like edge member fixed to the edge of the mesh material is used as the groove. It is widely used to fit from the outside. In this attachment means, removal of the edge member is prevented by utilizing the fact that the mesh material makes a U-turn at the outer peripheral portion of the spine frame.

  On the other hand, according to Patent Document 2, as a seat structure of mesh specification, a frame of the seat is constructed by a seat frame and a fastening frame overlapped on the lower surface thereof, and an edge member (locking edge member) between them. It is disclosed to clamp the seat frame and the fastening frame with a bolt.

Japanese Patent Application Publication No. 2015-519111 JP 2004-49687 A

  Although the mounting method of inserting the edge member into the groove is simple in structure, there is a problem that the edge member may come out of the groove. In particular, when there is a constriction in the back frame as in Patent Document 1, since the tension of the mesh material acts in the direction in which the edge member is pulled out of the groove, the removal of the edge member is particularly problematic.

  On the other hand, if the edge member is sandwiched and fastened between the two members as in Patent Document 2, removal of the edge member can be reliably prevented, but when applied to the backrest, the bolt head is exposed on the rear surface of the back frame. There is a problem that the aesthetics deteriorate.

  The present invention has been made to improve such a situation.

The present invention includes various configurations, the representative of which is specified in the respective claims. Among these, claim 1 constitutes the upper concept, and in a body pressure support of a construction in which a flexible mesh material is stretched on a frame material,
"A tape-like edge member is fixed to the periphery of the mesh material,
A cover member is fixed to a surface portion of the frame on which the mesh material is located, and a long groove into which the edge member is inserted from the outside is fixed between the frame material and the cover member on the outer periphery of the frame material. It is formed to be open,
And, the edge member and the frame member or the cover member are provided with engagement means for preventing the edge member from coming off. "
It has the composition.

  The invention of claim 2 embodies the invention of claim 1 in a backrest. That is, in the second aspect, the frame member has a deformation allowing portion that can be deformed by the body pressure of the seated person, and the cover member is weakened so as to be deformed together with the deformation allowing portion It is arranged in the state.

  According to a third aspect of the present invention, in the first or second aspect, the frame member has an inward bending portion recessed in an inward direction of the frame member when viewed from the direction in which the body pressure of the seated person is applied. The cover member is disposed on the entire inward bending portion.

  A fourth aspect of the present invention embodies the configuration of the second aspect in a backrest. That is, in the second aspect, the frame member is a back frame that constitutes a backrest, and is configured to have left and right side members and is opened forward and backward. An overhanging deformation permitting portion is formed.

  The invention according to claim 5 is also embodied in the backrest, and in claim 3 or 4, the frame material is a back frame constituting the backrest, and is opened in the front and back direction with the left and right side members. The side member is provided with an inwardly curved portion which is recessed leftward and rightward in a front view.

  In the present invention, as the weakening means for facilitating the deformation of the frame member and the cover member, various structures can be adopted such as forming a slit, thinning, thinning or making a large number of holes. It is also possible to form in a bellows-like shape.

  In the present invention, the long groove is formed by fixing the cover member to the frame member, and the edge member is inserted into the long groove from the outside. And although the cover member can be fixed to the frame member with a screw, the mesh member hides the cover member, so by inserting the screw from the surface side of the cover member, the cover member can be used as a frame member without exposing the head of the screw. It can be fixed. Therefore, even when the rear surface of the frame material is visible to the human eye, as in the case of the backrest, the deterioration of the aesthetic appearance can be prevented.

  And since the edge member is held by the engagement means so as not to come out of the long groove, the edge member can be prevented from coming off. In particular, when applied to a member having an inward bending portion as in claims 3 and 5, removal of the edge member can be prevented and high reliability can be ensured.

  Furthermore, as the engagement means, it is necessary to form an engagement projection or the like on the frame member or the cover member or both, but since the frame member and the cover member are separately manufactured, the frame member and the cover member are injection molded In manufacturing by a molding method such as die casting or the like, it can be manufactured in a state where it can be easily punched out. Therefore, although it is a structure which can prevent the drop of an edge member, manufacture is easy and therefore it is excellent in practicability.

  Forming a deformation allowing portion that deforms (for example, rotates) due to the physical pressure of the seated person on a frame member such as a back frame is advantageous in that the holding property of the body can be improved. Since the cover member is also weakened so as to be deformed together with the deformation allowing portion, the mesh material can be easily attached without losing the advantage such as the improvement of the holding property.

  When the combination of the engagement hole and the engagement protrusion is employed as the engagement means as in the embodiment, there is an advantage that the edge member can be reliably prevented from being detached while having a simple structure. In this case, when the inclined surface for guiding the insertion of the edge member is formed in the engagement projection as in the embodiment, the edge member can be easily attached and the workability is excellent.

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.

(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.

  As shown in FIG. 1 (B) and FIG. 5 (A), the movable base 6 is connected to the part of the fixed base 5 in front of the leg support 4 by the left and right long first shafts 7. A back support 8 is fixed to the rear end portion of 6 (note that although the first shaft 7 is displayed in FIG. 1B, this is a display for convenience, in fact, the first shaft is 7 is hidden by side view and can not be seen.) 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 11 of the back frame 9 has the chevron part 11a which protruded forward in the side view, and protruded left and right outward in the front view as an example of a deformation | transformation acceptance | permission part described in the claim. The chevron portion 11a is deformable so that the side view posture and the front view posture change depending on the body pressure of the seated person.

  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.

  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.

  In the non-locking state where the seated person is not leaning against the backrest 2, no external force in the vertical direction acts on the pad support 23. Therefore, 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 (however, depending on the side view posture of the pad support 23, the longitudinal position also changes if the height changes) Can change to

  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.

  In addition, the code | symbol 80 shown to FIG. 4 (A) is a lumbar frame which the lumbar pad 22 attached. Further, reference numeral 65 shown in FIG. 6A denotes a bearing boss portion provided in the state of the back support 8, reference numeral 66 formed on the middle member 14 denotes a bearing recess, reference numeral 72 denotes a center cover, and reference numeral 89 denotes a lock body.

(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.

  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.

  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.

  As shown in FIG. 5 (A), the rear end of the tilting base 6 extends behind the fixed base 5, while as shown in FIG. 1 (B), the lower end of the back support 8 is behind 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.

(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. 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, and the edge member 34 is engaged. As a part of the means, the engagement holes 35 are open in the vertical direction. 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 part of the side member 11, the narrow portion 36 is present inward in a front view. In other words, the left and right side members 11 are largely bent inward in a front view. The middle member 14 is connected to the neck portion 36.

  In the present embodiment, the constricted portion 36 is shown as the most inward bent portion for convenience, but it is also possible to call the entire inward bent portion a constricted portion. In any case, a part of the inward bending portion overlaps a portion of the chevron portion 11a located above the apex 37. Therefore, in the present embodiment, the formation of the chevron portion 11a and the inward bending portion are in an integral relationship.

  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 portion which basically does not deform 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 formed thin. Therefore, the chevron portion 11 a bends particularly easily around its apex 37. In addition, the chevron portion 11a (particularly, a portion above the apex portion 37) 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%.

  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. 2B, the side cover 39 is formed, as a part of the engagement means, with an engagement projection 42 in which the engagement hole 35 of the edge member 34 is fitted by jumping 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. Although the head of the screw 40 is exposed to the front, since it is covered with the mesh material 10 and can not be visually recognized, the problem of aesthetics does not occur.

  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 36 has high quality Can be provided by 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.

  Although the side cover 39 is also a part of the back frame 9 and therefore, strictly speaking, the back frame 9 may be composed of the main body and the side cover 39, but in the present application, the back frame The expression 9 indicates that the side cover 39 is fixed.

  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, slits 43 are formed as an example of the weakening means described in the claims 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, narrowing the portion of the side cover 39 above the upper half of the mountain-shaped portion 11a is also an example of a weakening means, which also facilitates deformation of the mountain-shaped portion 11a. It is tight.

  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. 13 (B), 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. In addition, it is also possible to attach an upper cover to the upper member 12 and to form a laterally long groove between both.

  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 projected portion 47 is formed in the expanded groove portion 46 There is. 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. Although two bearing portions 51 are formed in the side member 11 and one bearing portion 52 is formed in the lower member 13, 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. (See also Figure 1 (C)).

  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.

  As shown in FIG. 5A, a lower horizontal groove 62 opened downward is formed in the mating surface of the lower member 13 and the lower cover 54, and provided at the lower end of the mesh material 10, although not shown explicitly. An edge member 34 is inserted into the lower horizontal groove 62. The lower horizontal groove 62 and the vertical groove 41 communicate with each other on the outside of the pin 50.

  The lower cover 54 is not provided with a locking means for the edge member 34. Therefore, although it can not be said that it is a cover member of this invention, it is possible to provide the engagement protrusion similar to the side cover 39, and to set it as the cover member of this invention.

  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 85 is formed in the shape of a belt made of an elastic 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.

  The lower end portion (right end portion) of the stopper 58 is nondisplaceably fitted to the first boss body 59 protruding forward on the lower member 13, while the upper end portion (left end portion) of the stopper 59 faces forward to the side member 11 It is fitted in the protruding second boss body 60 (the second boss body 60 doubles as the boss 44 into which the screw 40 is screwed). 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 inward rotation of the chevron portion 11 a of the side member 11 is restricted by the second boss 60 touching the bottom of the long slot 61 of the stopper 58. 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. Therefore, the durability can be significantly improved as compared with the case where the side members 11 and the lower members 13 are in direct contact with each other. As a result, practicability can be improved.

  The stopper 58 can be elastically deformed (bent and deformed) after being in contact with the second boss body 60. By this bending and deformation, the impact at the time of the inward rotation of the chevron portion 11a can be alleviated. As a result, it is possible to prevent the seated person from having a sense of discomfort.

  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.

  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 34 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 .

  Accordingly, the chevron portion 11a is deformed and the bending force does not repeatedly act on the edge member 34. Therefore, 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.

  Although the embodiments of the present invention have been described above, the present invention can be embodied in various ways. For example, when applying to a backrest, it can apply also to what does not have a constriction part and a chevron part. It is applicable also to the type which the side of a backrest does not deform. Mesh materials widely include flexible materials such as woven fabrics and knitted fabrics.

  As a deformation mode of the deformation allowing portion, the deformation allowing portion is not limited to be elastically deformed as a whole, and includes a configuration in which it is bent around a hinge. In this case, the cover member can be divided at the hinge portion, or the cover member can be continuous in series so that the cover member can be bent and deformed together with the frame member.

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

Backrest as an example of 2 body pressure support 9 back frame (frame material)
10 Mesh material as an example of a body support material 11 Side member 11a Angled portion as a deformation allowing portion 12 Upper member 13 Lower member 14 Middle member 34 Edge member 35 Engaging hole constituting engaging means 36 Inward bending portion configured Narrow portion 39 Side cover as cover member 42 Engaging projection constituting engagement means 43 Slit as an example of weakening means

Claims (5)

The frame material has a flexible mesh material stretched,
While a tape-like edge member is fixed to the periphery of the mesh material,
A cover member is fixed to a surface portion of the frame on which the mesh material is located, and a long groove into which the edge member is inserted from the outside is fixed between the frame material and the cover member on the outer periphery of the frame material. It is formed to be open,
And, the edge member and the frame member or the cover member are formed with engagement means for preventing the edge member from coming off.
Chair pressure support. The frame member has a deformation allowing portion that can be deformed by body pressure of a seated person, and the cover member is disposed in a weakened state so as to be deformed together with the deformation allowing portion.
The pressure support as claimed in claim 1. The frame member has an inward bend which is recessed in the inward direction of the frame member when viewed from the direction in which the body pressure of the seated person is applied, and the cover member is disposed on the entire inward bend. Yes,
A pressure support as claimed in claim 1 or 2. The frame member is a back frame that constitutes a backrest, and has left and right side members and is opened in the front and rear direction, and the side members are formed with a deformation permitting portion projecting outward in the left and right direction in front view doing,
A backrest as a pressure support of the chair according to claim 2. The frame member is a back frame that constitutes a backrest, and has a configuration in which it has left and right side members and is opened to the front and back, and the inward bent portion concaved in the left and right in front view Form,
A backrest as a pressure support of a chair according to claim 3 or 4.

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