JP7102312B2 - Engagement structure of chair parts, and chair - Google Patents

Description

The present invention relates to an engaging structure of chair parts and a chair. More specifically, the present invention provides, for example, an engagement structure suitable for use as a structure for attaching one component constituting a chair to the other component, and a configuration to which such an engagement structure is applied. Regarding chairs including.

Conventionally, there has been a backrest of a chair in which an inner shell covered with a cushion or the like is attached to a rigid outer shell (Patent Document 1).

As a mode of attaching the inner shell to the outer shell, for example, a structure of fitting and killing by protrusions or the like may be adopted.

Japanese Unexamined Patent Publication No. 2005-160896

However, when removing the inner shell from the outer shell for parts replacement or maintenance, the parts may be damaged during the removal due to the fitting structure, and replacement or repair with a substitute is required. There is a problem that it will be needed.

Therefore, the present invention provides a chair including an engagement structure capable of realizing engagement / connection that is removable but hard to be easily disengaged, and a configuration to which such an engagement structure is applied. The purpose is.

In order to achieve such an object, the engagement structure of the chair parts of the present invention is an engagement structure between the first part and the second part, and the first part is provided with a recess, and the second part is provided. The component is provided with a convex portion that is detachably elastically deformed and engaged with the concave portion, and the convex portion and the concave portion engage with at least one of the first component and the second component. A rotation suppressing portion for reducing or suppressing the rotation of the convex portion with respect to the concave portion in the state of being formed is provided , and the convex portion is provided with a pair of joint support portions that project apart from the second component. It has a pair of hooking portions that are connected to these pair of joint support portions and a pair of inclined portions that are connected to these pair of hooking portions, and the hooking portions are directed toward the inclined portion from the joint supporting portion. The inclined portion is arranged so as to be widened and inclined and the inclined portion is narrowed toward the tip to form a house shape in a cross-sectional view, and the concave portion has a claw portion on which the hook portion is hooked. It is designed to be provided as .

Therefore, according to the engagement structure of the parts of this chair, since the convex portion is elastically deformed to engage with the concave portion, it is configured as a detachable structure and is in a state of being engaged with the concave portion. Since the rotation suppressing portion for reducing or suppressing the turning of the convex portion is provided, the displacement or deformation of the convex portion in the state of being engaged with the concave portion is the relationship between the convex portion and the concave portion. Displacement and deformation of the convex portion, which is inappropriate for the case, are suppressed.

The engagement structure of the chair component of the present invention may be provided so that the turning suppressing portion at least reduces or suppresses turning along the direction in which the convex portion is elastically deformed. In this case, among the displacements and deformations of the convex portion in the state of being engaged with the concave portion, the displacement and deformation that are particularly inappropriate for the engagement between the convex portion and the concave portion are effectively suppressed.

In the engaging structure of the chair parts of the present invention, the turning suppressing portion may be provided as a wall-shaped protrusion. In this case, the turning suppressing portion has a structure that effectively suppresses the displacement and deformation of the convex portion.

In the engaging structure of the chair parts of the present invention, the turning suppressing portion engages the portion where the force for winding the first part or the second part is applied, and the convex portion and the concave portion. It may be provided on a line connecting the position and the position. In this case, among the displacements and deformations of the convex portion in the state of being engaged with the concave portion, the displacement and deformation that are particularly inappropriate for the engagement between the convex portion and the concave portion are effectively suppressed.

In the engaging structure of the chair component of the present invention, the second component may be provided with a plurality of the convex portions, and the elastic deformation direction of each of the convex portions may be different between the adjacent convex portions. In this case, even if an external force is applied from various directions, it is effectively prevented that the convex portion and the concave portion are unexpectedly disengaged.

Further, the chair of the present invention is provided with a backrest to which the above-mentioned engagement structure is applied and the inner shell is attached to the outer shell. Therefore, according to this chair, a chair is realized in which the action of the engagement structure of the above-mentioned chair parts is exhibited.

According to the engagement structure of the parts of the chair and the chair of the present invention, the displacement or deformation of the convex portion in the state of being engaged with the concave portion, which is inappropriate for the engagement between the convex portion and the concave portion, is the displacement of the convex portion. Since it is possible to suppress deformation and deformation, it is possible to prevent the convex portion from being displaced or deformed and unexpectedly disengaging the engagement with the concave portion, which is useful as an engagement structure. It is possible to improve the reliability and the safety and comfort of use of the equipment to which the engagement structure is applied.
Further, since the convex portion has a cross-sectional view of the house shape and the concave portion has a claw portion on which the house shape is hooked, the convex portion does not easily come off, but it comes off when pulled by an appropriate force. That is, when the convex portion that is inserted into the concave portion and is engaged is pulled out, the pair of hooking portions of the convex portion are slid against the inner edges of the pair of claw portions that form the opening of the concave portion. While moving, the hooking portion is elastically deformed as a convex portion in the opposite directions (that is, the elastic deformation direction) of the pair of joint support portions, the hooking portions, and the inclined portions facing each other while being separated from each other. It gets over the claw part and is pulled out from the concave part together with the inclined part. Further, the convex portion, the concave portion, and the rotation suppressing portion appropriately secure the coupling force between the second component inner shell and the first component outer shell, and then the second component is replaced or maintained as necessary. The problem is that the inner shell of the second part can be removed from the outer shell of the first part, and the part is damaged during removal, requiring replacement or repair with a replacement. Is circumvented. That is, the engagement / connection that is removable and does not easily come off is realized.

When the engaging structure of the parts of the chair of the present invention and the chair are designed to suppress the rotation of the convex portion along the direction of elastic deformation, the displacement or deformation of the convex portion in the state of being engaged with the concave portion is caused. Of these, displacement and deformation that are particularly inappropriate for the engagement between the convex portion and the concave portion can be effectively suppressed, so that the convex portion is displaced or deformed and the engagement with the concave portion is unexpectedly disengaged. It is possible to prevent this from happening particularly effectively, and it is possible to further improve the usefulness and reliability of the engagement structure, and the safety and use of the equipment to which the engagement structure is applied. It is possible to further improve the comfort.

The engagement structure of the parts of the chair and the chair of the present invention have a structure in which the rotation suppressing portion effectively suppresses the displacement and deformation of the convex portion when the turning suppressing portion is formed as a wall-shaped protrusion. Therefore, it is possible to further improve the usefulness and reliability of the engagement structure, and further improve the safety and comfort of use of the equipment to which the engagement structure is applied. Will be possible.

The engagement structure of the parts of the chair of the present invention or the chair engages with the concave portion when the rotation suppressing portion is provided on the line connecting the point of action of the force for winding the parts and the engagement position of the parts. Of the displacement and deformation of the convex portion in the state of being in the state, the displacement and deformation that are particularly inappropriate for the engagement between the convex portion and the concave portion can be effectively suppressed, so that the convex portion is displaced or deformed. It is possible to prevent the engagement with the recess from being unexpectedly disengaged, and it is possible to further improve the usefulness and reliability of the engagement structure and the engagement structure. It is possible to further improve the safety and comfort of use of the equipment to which the above is applied.

In the engaging structure of the chair parts and the chair of the present invention, when the elastic deformation directions of the adjacent convex portions are made different from each other, the convex portion and the concave portion can be connected to each other even if an external force is applied from various directions. It is possible to effectively prevent the engagement from being disengaged unexpectedly, and it is possible to further improve the usefulness and reliability of the engagement structure, and the engagement structure has been applied. It is possible to further improve the safety of the equipment and the comfort of use.

In the engaging structure of the chair parts and the chair of the present invention, when the convex portion has a cross-sectional view house shape and the concave portion has a claw portion on which the house shape is hooked, the convex portion and the concave portion are removed. One of the preferred combinations can be realized, and the engaging structure can be made into an appropriate configuration.

It is a perspective view which shows one Embodiment of the chair to which this invention is applied. It is a perspective view which shows one Embodiment of the slide structure of a movable elbow. It shows a state in which the upper surface angle is tilted backward. It is a central vertical cross section of a slide structure of a movable elbow in a state where the elbow pad is moved to the front end position and held in a horizontal posture. FIG. 3 is a perspective view showing the relationship between the first guide groove of the upper slider part and the fixed shaft by removing the pad of the armrest of the armrest of FIG. It is a perspective view seen from the bottom which shows the spherical sliding surface of the upper slider part. It is a perspective view which shows the relationship between the 2nd guide groove of the lower slider part, a fixed shaft and a movable shaft by removing the upper slider part of the armrest of the armrest of FIG. It is an exploded perspective view of a lower slider part and an elbow rest receiving part. It is a perspective view which shows the other embodiment of the lower slider part and the elbow rest receiving part. It is a top view which shows the movement locus of the armrest of the armrest of FIG. It is a perspective view which shows the embodiment which applied the spring support structure of a chair to a tilt spring mechanism, and shows the connection part of a synchro frame and a back frame in an enlarged manner. It is a perspective view which shows one Embodiment of a main frame and a synchro frame. It is a perspective view which shows one Embodiment of a main frame. It is a perspective view which shows the lower end arm part attached to the synchro frame of a back frame in an enlarged manner. It is a vertical cross-sectional view which shows the tilt spring mechanism and the mechanism around it enlarged. It is a perspective view which shows one Embodiment of the tilt spring mechanism seen from the other spring mount side. It is a perspective view which shows one Embodiment of the tilt spring mechanism seen from one spring mount side. It is an exploded perspective view which shows one Embodiment of the backrest mounting structure as seen from the back side. It is an enlarged exploded perspective view of the upper connection part between a backrest and a back frame. It is a top view of the back frame. It is a cross-sectional view which shows the fitting state of the pocket part of the backrest and the T-shaped locking member of a back frame. It is a perspective view of a resin spring. It is explanatory drawing of the mounting state of the resin spring with respect to a pocket part. It is a left front upper perspective view which shows the state which disassembled the inner shell and the outer shell of the backrest of the chair of embodiment. It is a right rear lower perspective view of the inner shell of the backrest of an embodiment. It is sectional drawing along the vertical vertical plane of the peripheral part of the bending locking piece in the state which the inner shell of the backrest of embodiment is attached to the outer shell. FIG. 5 is a cross-sectional view taken along the vertical vertical plane of the peripheral portion of the curved locking piece in a state where the inner shell of the backrest of the embodiment is attached to the outer shell. FIG. 5 is a cross-sectional view taken along the vertical vertical plane of the engaging convex portion, the engaging concave portion, and the peripheral portion of the rotation suppressing portion in a state where the inner shell of the backrest of the embodiment is attached to the outer shell. The front-back vertical direction of the engaging convex portion, the engaging concave portion, and the peripheral portion of the rotation suppressing portion, which explains the coupling force between the engaging convex portion and the engaging concave portion in the case of being pulled in a direction orthogonal to the elastic deformation direction. It is a cross-sectional view along a plane. In the front-rear direction vertical plane of the engaging convex portion, the engaging concave portion, and the peripheral portion of the rotation suppressing portion, which explains the coupling force between the engaging convex portion and the engaging concave portion in the case of being rolled along the elastic deformation direction. It is a cross-sectional view along. It is a left front perspective view explaining the relationship between the outer shell of the backrest of embodiment, the operation part and the extrusion part which constitute an extrusion member. It is a left front upper perspective view of the operation part of the extrusion member of an embodiment. It is a right rear upper perspective view which shows the state which disassembled the operation part and the extrusion part of the extrusion member of embodiment. It is a right side view which shows the state which the operation part which constitutes the extrusion member of embodiment and the extrusion part are combined and attached to the outer shell of the backrest (the outer shell is shown as a schematic cross section). It is a figure explaining how to attach the operation part which comprises the extrusion member of embodiment to the outer shell.

Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings. In the present embodiment, an example of the embodiment of the engagement structure of the chair parts according to the present invention will be given as an example when it is used in assembling the backrest of an office swivel chair that can be used in an office or the like.

1 to 34 show an example of an embodiment of a chair to which the present invention is applied. In this specification, the front-back, left-right directions are defined centering on the seated person, and "front or front" means the chair and the seated person sitting on the chair in each of the armrest, the seat, and the backrest. Is forward or forward, and "rear or backward" is also backward or backward for the chair and occupant. Further, the directions orthogonal to the front-rear direction and the horizontal plane are the left-right directions for the seated person in each of the armrest, the seat and the backrest, and are the width directions of the chair. In addition, "above" and "below" are above and below the chair and seater in the armrests, seat and back, respectively, above and below in the vertical plane.

The chair to which the engagement structure of the chair parts of the present embodiment is applied is, for example, a leg 1 having casters, a main frame (see FIG. 11) 2 supported by the legs 1, and a swing with respect to the main frame. A movably connected synchro frame (see FIG. 11) 3, a seat 4 supported between the main frame 2 and the synchro frame 3, and a back frame (see FIG. 10) 5 supported by the synchro frame 3. It has a backrest 6 supported by the back frame 5 and the synchro frame 3, and a movable elbow 7 attached to the seat 4.

As shown in FIG. 11, for example, the locking mechanism of the chair includes a main frame 2 attached to the upper end of the leg 1 and an arrangement of the main frame 2 above the main frame 2 to move back and forth and tilt with respect to the main frame 2. The seat (mainly the seat outer shell) 4 which is attached so as to enable the seat 4 and the seat 4 which is swingably connected to and supported by the main frame 1 and rotatably connected to the rear end of the seat 4. A synchro frame 3 to which the lower end portion of the backrest 6 is connected, a synchro gas spring with a lock mechanism (hereinafter, simply referred to as a synchro gas spring) 8 interposed between the main frame 2 and the synchro frame 3, and a synchro. It is composed of a back frame 5 that is swingably connected and supported by the frame 3 and on which the upper portion of the backrest 6 is hooked. A reaction force mechanism (for example, a compression coil spring) (not shown) is provided between the main frame and the front end of the synchro frame.

Further, in the case of the present embodiment, the back frame 5 is swingably connected to the rear end of the synchro frame 3 in the front-rear direction, and from a compression coil spring (not shown) between the main frame and the front end of the synchro frame. A reaction force mechanism is provided, and a synchro gas spring 8 is attached between the rear end side of the main frame and the middle of the synchro frame, while between the shaft at the front end of the main frame 2 and the shaft of the synchro frame 3. The front end and the rear end of the seat 4 are rotatably supported, and the back frame 5 is fixed to the rear end of the synchro frame 3 so as to be tiltable in the front-rear direction. In addition, it is fixedly supported at an arbitrary position, and a force that gives a repulsive force to the tilt and returns it to the initial position is always urged. Further, in the case of the present embodiment, a tilt spring mechanism 9 is incorporated between the synchro frame 3 and the lower end of the back frame 5, and only the backrest 6 is provided with a tilt function of tilting together with the back frame 5. Although not shown in the present embodiment, the seat 4 has an inner shell having a spring property as a structural member that evenly supports the weight of the seated person, and a cushion material such as urethane foam placed on the inner shell. It is composed of a stretched material that wraps the cushion material and the inner shell, and an outer shell (corresponding to a seat holder) that receives them and is attached to the main frame. ..

In the present embodiment, the optional member of the chair includes a support member attached to a part of the chair such as the back or a seat of the chair, and a movable member that is slidable with respect to the support member and has a use surface on the upper surface. Have. The support member and the movable member are provided so that the movable member is slidable with respect to the support member, and at least one of the sliding surfaces between the support member and the movable member is a spherical surface or a curved surface. Alternatively, it is provided with a slide mechanism that slidably supports the movable member so that the other sliding surface moves on the curved surface, and constitutes a spherical slide that changes the inclination of the upper surface of the movable member according to the sliding operation of the movable member. The movable member is provided so as to change the inclination of the used surface of the movable member by sliding with respect to the support member.

(Optional member mounting structure and chair movable elbow slide structure)
2 to 9 show an example applied to the slide structure of the movable elbow as an example of the embodiment of the optional member of the chair of the present invention.

The armrest of the present embodiment has a slide structure in which the elbow rest 13 as a movable member can slide on the elbow rest receiving portion 12 on the elbow support 11 which is a support member fixed to the chair body side. That is, a slide mechanism 14 constituting a spherical slide that slidably supports the elbow rest 13 between the elbow rest receiving portion 12 and the elbow rest 13 so as to move on a spherical surface or a curved surface with respect to the elbow rest receiving portion 12. The vertical angle (hereinafter referred to as the upper surface angle θ of the elbow pad) of the used surface of the elbow pad 13 (hereinafter referred to as the upper surface 24 of the elbow pad or simply the upper surface 24) is changed according to the sliding operation of the elbow pad 13. It is the one that was made. In the present specification, the inclination of the used surface of the optional member (so-called vertical angle of the upper surface) is based on the upper surface of the optional member (a surface where a part of the seated person's body, for example, an arm or an elbow touches). Plane For example, it is an angle measured up and down with reference to the tangent plane (horizontal plane) passing through the pole where the vertical axis passing through the center of curvature of the spherical surface or curved surface constituting the sliding part intersects the spherical surface or curved surface, and is synonymous with high and low angles. The upper part is the elevation angle and the lower part is the depression angle.

The movable elbow of the present embodiment is an example having a height adjusting function, and has, for example, a strut structure in which the height of the elbow rest receiving portion 12 that supports the elbow rest 13 can be adjusted. That is, the elbow support 11 is composed of a support body 21 fixed to the chair body side and an elevating frame 22 that is housed in the column body 21 so as to be able to move up and down, and straddles between the support body 21 and the elevating frame 22. By the action of the locking lever 23 incorporated so as to be able to switch between the engaged state (fixed state) in which the support column body 21 and the elevating frame 22 are mutually connected and the state in which the support column 21 and the elevating frame 22 are separated and can be elevated (released state). It is said to be a structure. At the upper end of the elevating frame 22, an elbow rest receiving portion 12 including a pedestal portion (for example, an elliptical pedestal portion 22a as shown in FIGS. 7 and 8) expanded to be wide enough to support the elbow rest 13 is provided. It is equipped. Of course, the mechanism by which the elbow support 11 expands and contracts, that is, the mechanism that enables the height of the armrest to be adjusted, makes it possible to adjust the height position of the armrest 13 according to the physique and preference of the seated person. Is preferable, but it is not always necessary. Therefore, the elbow rest receiving portion 12 may have a structure integrally molded with the support column main body 21 in some cases.

The armrest 7 of the present embodiment is mainly configured to be fixed to the back surface side of the seat 4, for example, the seat back cover, the seat plate shell constituting the seat, or a seat receiving member (not shown) for attaching the seat to the legs. The L-shaped strut body 21, the elevating frame 22 that is retractably housed in the rising portion 21a of the strut body 21, and the elbow rest receiving portion 12 formed at the upper end of the elevating frame 22. It is composed of an elbow pad 13 that forms a sliding portion (spherical sliding) between the two. Then, the support column main body 21 is fixed to a seat plate shell or the like whose base end portion 21b is not shown by fasteners such as bolts, and the elbow rest receiving portion 12 which is the upper end portion is located near the elbow of the seated person, for example. The elbow rest receiving portion 12 is arranged substantially parallel to the side edge of the seat and assembled to the chair body. In the present embodiment, the elbow support 11 is attached to the bottom surface of the seat and is installed as a fixed frame that does not rotate with the locking operation of the back. However, in some cases, it may be attached to the back (not shown) or to a member that tilts with the locking operation of the back.

In the case of the present embodiment, for example, as shown in FIG. 3, the slide mechanism 14 slides the upper surface of the elbow rest receiving portion 12, that is, the sliding surface 40d of the lower slider part 15, and the lower surface of the elbow rest 13, that is, the upper slider part 16. It is composed of a moving surface 40u and a connecting means for slidably connecting them. As the connecting means, in the case of the present embodiment, for example, a shaft that slidably connects the lower slider part 15 and the upper slider part 16 through the guide grooves 19 and 20 that determine the motion locus and the guide grooves 19 and 20. It is composed of a combination of screws 17 and 18, for example, one shaft (hereinafter referred to as a movable shaft 17) penetrates a guide groove (hereinafter referred to as a second guide groove 20) of the lower slider part 15 and is formed. It is fixed to the elbow rest 13, and the other shaft (hereinafter referred to as the fixed shaft 18) penetrates the guide groove (hereinafter referred to as the first guide groove 19) of the upper slider part 16 and taps the elbow rest receiving portion 12. It is fixed by being screwed into the screw boss 22c. Here, it is preferable that the movable shaft 17 and the fixed shaft 18 are fastened toward the center of curvature of the spherical surface or the curved surface of the slide mechanism 14. In this case, it is unlikely that twisting will occur during sliding.

In the case of the present embodiment, as shown in FIGS. 4 and 6, the guide groove is divided into the lower surface of the elbow rest 13, that is, the upper slider part 16, and the upper surface of the elbow support receiving portion 12, that is, the lower slider part 15, and is independent of each other. It is formed by letting it. The second guide groove 20 of the lower slider part 15 guides, for example, the front half of the elbow rest 13, and is formed in an arc shape that is displaced inward in the width direction of the chair as shown in FIG. As a result, the front half of the elbow pad 13 is displaced inward in the width direction of the chair in the middle of the track, and then displaced outward in the width direction of the chair again, and the front end is slightly inside the rear end position. I will guide you to the position. On the other hand, the first guide groove 19 of the upper slider part 16 guides the latter half of the elbow rest 13, for example, and in the case of the present embodiment, like the second guide groove 20, the inside in the width direction of the chair. By being formed in an arc shape that displaces toward, the latter half of the elbow pad 13 is displaced inward in the width direction of the chair in the middle of the track, and is displaced outward in the width direction of the chair again, and the front end. Then, we will guide you to a position slightly inside the rear end position. Therefore, as shown in FIG. 9, the elbow pad 13 moves back and forth in a meandering manner in cooperation with the first guide groove 19 and the second guide groove 20.

Here, the guide mechanism of the present embodiment is configured by separately forming one guide groove 19 in the upper slider part 16 and the other guide groove 20 in the lower slider part 15, while being upward on the side of the elbow rest receiving portion 12. A fixed shaft 18 that moves relative to the inside of the guide groove 19 of the slider part 16 is provided, and a movable shaft 17 that moves (moves with the elbow rest) in the guide groove 20 of the lower slider part 15 is provided on the side of the elbow rest 13 which is a movable member. The structure is such that the elbow pads 13 are given movement by the relative movement of the two axes 17 and 18 in the two guide grooves 19 and 20. By dividing the plurality of guide grooves 19 and 20 into two overlapping parts 15 and 16, the elbow rest receiving portion and the upper surface of the elbow support portion have a limited space as long as the space for arranging the guide grooves and the shaft is not large. However, by providing a plurality of grooves, it is possible to prevent a decrease in the structural strength of each of the parts 15 and 16 and to combine the plurality of guide grooves 19 and 20 so as to overlap (interfere with each other). Therefore, the restriction on the movement of the elbow pad 13 is reduced (in other words, the monotony is eliminated and it is possible to draw a complicated trajectory), and a characteristic trajectory can be drawn. In the present embodiment, an example in which two guide grooves are used as a plurality of guide grooves is described, but the present invention is not particularly limited to this, and three or more guide grooves are used as needed. May be divided into three or more parts.

The structure in which the plurality of guide grooves 19 and 20 are dispersed is not particularly limited to the above-mentioned armrest structure that moves on a spherical surface. Needless to say, for example, it can be applied to an armrest structure that moves on a flat sliding surface. Further, in the present embodiment, the first guide groove 19 and the second guide groove 20 are both arcuate, but the combination of the groove shapes is not limited to this, and one or both guide grooves, for example, the first guide groove, are used. 19 may be in a linear form, or may be in various non-linear forms such as hyperbolic, polygonal, S-shaped, L-shaped, T-shaped, Y-shaped, V-shaped, J-shaped, etc., which are not shown. It may be a combination of non-curve shapes.

Further, the plurality of guide grooves 19 and 20 provided separately for the upper slider part 16 and the lower slider part 15 support at least the front side and the rear side in the slide direction, and the guide grooves 20 arranged in the front side. Is preferably arranged in the lower slider part 15 and the guide groove 19 arranged in the rear is arranged in the upper slider part 16. In this case, the second guide groove 20 of the lower slider part 15 fits in the space inside the elbow rest receiving portion 12, and is covered with the upper slider part 16 so as not to be exposed to the outside. On the other hand, since the first guide groove 19 of the upper slider part 16 is provided behind the elbow rest receiving portion 12, the seated person grasps the front portion of the elbow rest 13 and pulls down the elbow rest 13. Since a part of the groove is not exposed in front of the elbow rest receiving portion 12, or even if it is exposed, it is rarely present within the reach of the fingertips. Therefore, even if the elbow rest 13 is moved so as to protrude in front of the elbow rest receiving portion 12, even if the finger is placed on the front part of the elbow rest 13, an accident such as finger pinching may occur. There is no.

The elbow pad 13 is composed of, for example, an upper slider part 16, a pad 25 covering the upper slider part 16, and an inner shell 27 fixed to the pad 25. Here, the inner shell 27 is provided with, for example, a claw having an L-shaped vertical cross section, and has a structure in which the pad 25 and the upper slider part 16 are fixed by engaging with the engaging hole of the upper slider part 16. However, it may be omitted in some cases. Further, reference numeral 43 in the drawing is a hole for passing a fastening screw for connecting the upper slider part 16 and the inner shell 27 attached to the pad 25 covering the upper slider part 16, and 44 is a threaded portion of the movable shaft 17. It is a hole through which.

Here, the upper surface 24 of the elbow rest 13 is not limited to having a specific shape or angle, but is a flat surface (including not only a horizontal surface but also an inclined surface) or a spherical surface having a large radius of curvature close to a flat surface. Alternatively, an appropriate form such as a curved surface or a bent surface in which two sides of a horizontal surface having a dominant arc and an inclined surface are continuously formed can be taken as necessary, but in the case of the present embodiment. Is formed of a spherical surface having the same center of curvature as the spherical surface of the sliding portion (for example, illustrated in FIG. 3). In this case, since the upper surface 24 of the elbow pad 13 can be supported so as to fit the shape of the forearm of the seated person, concentration of surface pressure is unlikely to occur.

In the case of the present embodiment, the lower slider part 15 surrounds the guide member 35 forming the second guide groove 20 and the periphery of the second guide groove 20, as shown in FIGS. 6 and 7, and the upper slider part 15. It is composed of two members, a sliding member 36 that forms a sliding surface that is in sliding contact with the part 16. The guide member 35 includes a second guide groove 20 and a plurality of fool holes 33, and a portion where the edge 30 of the second guide groove 20 is formed in a jetty shape and the fool holes 33 arranged around the edge 30 are partitioned. The plates are connected to each other by ribs 29 to form one plate. On the other hand, the sliding member 36 has the same height as or slightly higher than the edge (jetty portion) 30 of the second guide groove 20 of the guide member 35, and surrounds the circumference of the second guide groove 20 and the fool hole 33. However, it is in sliding contact with the upper slider part 16. That is, the sliding surface 40d of the lower slider part 15 is mainly formed by the sliding member 36. The guide member 35 and the sliding member 36 are sliding members from side openings so as to penetrate the jetty-shaped edge 30 of the second guide groove 20 of the guide member 35 into the hole 42 of the sliding member 36. The guide member 35 is combined so as to be inserted into the space above the locking lever holding spring portion 32 of 36, and is housed in the pedestal portion 22a of the elbow rest receiving portion 12, and is fixed by screwing. The combined guide member 35 and the sliding member 36 are fitted and fixed to the step portion 22b formed by the inner rib 29 of the pedestal portion 22a, and are integrated with the top of the elevating frame 22 to provide an elbow pad. It constitutes a receiving unit 12. The guide member 35 and the sliding member 36 form a sliding surface 40d of a spherical or curved lower slider part 15. Reference numeral 41 in the drawing is a hole through which the boss 22C for screwing the fixed shaft 18 at the rear end of the elevating frame pedestal portion 22a passes, and the boss 22C supporting the fixed shaft 18 is surrounded by a part of the sliding member 36. It is provided as follows. Further, reference numeral 42 is a hole through which the jetty-shaped edge 30 for partitioning the second guide groove 20 of the guide member is penetrated. Reference numeral 32 denotes a locking lever holding spring portion that holds down the rotation axis of the locking lever 23 rotatably supported by the pedestal portion 22a.

The lower slider part 15 is not limited to the embodiment in which the lower slider part 15 is divided into two members. For example, as shown in FIG. 8, the lower slider part 15 may be composed of one member formed of a so-called spherical cap forming a gently convex spherical surface. good. The elbow rest receiving portion 12 is fitted into the step portion 22b of the pedestal portion 22a and fixed by screwing, and the top of the elevating frame 22 is integrated to form the elbow rest receiving portion 12. Of course, the elbow rest receiving portion 12 may be formed by integrally molding with the pedestal portion 22a in advance. Further, the slide mechanism according to the present embodiment is composed of an elbow rest receiving portion and an upper slider part and a lower slider part which are independent parts constituting a part of the elbow rest, but the slide mechanism is not particularly limited thereto. However, for example, although not shown, the upper surface of the elbow rest receiving portion and the lower surface of the elbow rest may be formed.

As the material constituting the sliding portion, a material for smoothing the relative sliding of the elbow rest 13 or the elbow rest receiving portion 12, for example, PTFE (Teflon (registered trademark)), MC nylon, POM, ultra-high molecular weight polyethylene, etc. It is preferable to use PET, PEEK, PPS, POM-HL (sliding grade) or a metal plate coated with these resin materials. For example, in the case of the elbow rest receiving portion 12 of the example shown in FIG. 8, the lower slider part 15 made of the above-mentioned plate of a material having excellent slidability is placed on the stepped portion (recessed portion) of the pedestal portion 22a at the top of the elevating frame 22. ) 22b is fitted and fixed to form a sliding surface. For example, by penetrating the lower slider part 15 and screwing the tapping screw (not shown) into the tapping screw boss 22c provided inside the pedestal portion 22a of the elevating frame 22, the step portion of the pedestal portion 22a is screwed. The lower slider part 15 fitted in the 22b is fixed to form the elbow rest receiving portion 12.

In the case of the present embodiment, the slide mechanism 14 is formed by a spherical surface in which the upper slider part 16 and the lower slider part 15 have the same curvature, that is, an upper slider part 16 formed of a concave surface and a lower slider part 15 formed of a convex surface, and at least each other. By combining the sliding surfaces and guides so that they are in close contact with each other on a spherical surface, the elbow pad 13 has a spherical sliding structure that slides and moves on the spherical surface. In this case, since the distance between the screws for fastening the upper and lower parts 15 and 16 does not fluctuate, there is an advantage that rattling does not occur with the slide of the elbow pad 13.

Further, in the slide mechanism 14 of the present embodiment, both the upper surface of the elbow rest receiving portion 12, that is, the surface of the lower slider part 15 and the lower surface of the elbow rest 13, that is, the surface of the upper slider part 16 are both spherical surfaces having the same radius of curvature (so-called so-called spherical surface). (Spherical cap), but the present invention is not particularly limited, and spherical surfaces having different curvatures may be used. In some cases, if at least one of the sliding surfaces constituting the slide mechanism 14 is a spherical surface or a curved surface, for example, an elbow support receiver. If the upper surface of the portion 12 is a spherical surface, the lower surface of the elbow pad 13 may be slidably contacted as a tangent plane as a flat surface. Of course, depending on the case, the sliding surface on the movable member side may be a spherical surface or a curved surface, and the sliding surface on the support member side may be an aspherical surface, for example, a flat surface. That is, the upper slider part 16 which is the lower surface of the elbow rest 13 does not need to be in close contact with the entire surface of the lower slider part 15 which is the upper surface of the elbow rest receiving portion 12, and is partially in close contact with the upper surface of the elbow rest receiving portion 12. The sliding portions that come into contact with each other may be formed. For example, the radius of curvature of the lower surface of the elbow pad 13 may be smaller than the radius of curvature of the upper surface of the elbow pad receiving portion 12. Also in this case, the elbow pad 13 can slide on the lower slider part 15 of the elbow pad receiving portion 12 in the front-rear direction to shift the position, and the upper surface angle of the elbow pad 13 can be changed.

In the case of the present embodiment in which the lower slider part 15 on the upper surface of the elbow rest receiving portion 12 is spherical, the sliding direction of the movable elbow is not limited to a specific direction, but can be in the front-back, left-right, and diagonal directions. It can be set in all directions including (that is, 360 °), but in the case of the present embodiment, it is set in the front-rear direction. The movable elbow slide mechanism always changes the direction of inclination, that is, the elbow pad upper surface angle θ at the same time as the movement of the elbow pad. Specifically, the fact that the upper surface angle θ of the elbow rest changes before and after the slide with the slide of the elbow rest means that the upper surface angle θ at the other stroke end is relative to the magnitude of the upper surface angle θ at one stroke end. It means that is smaller, and it is mentioned that it is almost 0 ° as one embodiment, but it is not particularly limited to this, and when the upper surface angle θ at one stroke end is greatly inclined. It is used as a general meaning that the upper surface angle θ at the other stroke end is smaller than that of. For example, in the present embodiment, when the elbow rest 13 is at the foremost part, the elbow rest upper surface angle θ is approximately 0 ° (not limited to the horizontal state of a flat surface in a strict sense, but vertical passing through the center of curvature of a spherical surface or a virtual spherical surface. It is a state in which the axis and the horizontal plane are orthogonal to each other (including the state shown in FIG. 2 (A)), and the structure is such that the degree of depression angle of the upper surface angle θ of the elbow pad 13 increases as it slides to the rear side and tilts backward. (See FIGS. 2 (A) and 2 (B)). That is, when the elbow pad 13, which is a movable member, is in the front end position, it is in a horizontal state, and as it slides backward, it is in a backward tilted state. Of course, the slide structure of the slide mechanism 14 is not particularly limited to the above-mentioned one. For example, when the elbow rest 13 is at the rearmost part, the upper surface angle θ of the elbow rest 13 becomes horizontal, and the elbow rest 13 faces the front side. The upper surface angle θ of the elbow rest 13 may be tilted forward (becomes a depression angle) as it slides, and further, when the elbow rest 13 is at the center position of the slide range in the front-rear direction, the upper surface angle of the elbow rest 13 is set. It may be horizontal or substantially horizontal (state of FIG. 2A), and the upper surface angle of the elbow rest 13 may be inclined to either the front or the back as the elbow rest 13 slides back or forth.

The sliding direction of the movable elbow is not limited to the front-back direction of the chair described above, and can be set in any direction. For example, the elbow rest 12 is provided on the support main body 21 so as to be arranged in the direction intersecting the side edge of the seat, the slide direction is oblique (the direction between the front-rear direction and the left-right direction), and the elbow rest 13 is diagonally forward. It may be provided so as to tilt forward as it slides in the direction, or to tilt backward as it slides diagonally backward. Further, the elbow rest receiving portion 12 is provided on the support column main body 21 so as to be arranged substantially parallel to the front edge of the seat so that the sliding direction is the left-right direction, and the upper surface angle θ when the elbow rest 13 is at one of the moving ends. It is possible that the upper surface angle θ at the other moving end becomes smaller than the size, or conversely, the elbow rest changes its inclination from a small upper surface angle θ to a large upper surface angle θ. For example, the upper surface angle θ of the elbow pad 13 is horizontal at the center position of the slide range, and the upper surface angle of the elbow pad tilts to the left or right as the elbow pad 13 slides to either the left or right moving end. You may do so. Further, when sliding in an oblique direction or a left-right direction, when the elbow rest 13 is at the center position of the slide range, the upper surface angle θ of the elbow rest 13 is inclined to either front or back or left or right, and the elbow rest 13 is front and back. Alternatively, the upper surface angle θ may become horizontal as it slides to the left or right.

In other words, the movable elbow tilts diagonally back and forth or to the left or right, and as one of various posture changes and angle changes of the elbow rest surface, when leaning against the backrest of the chair mentioned above, the elbow rest There is also an embodiment of an armrest that tilts backward (tilts so as to lower the rear end side) by sliding the chair backward. Regardless of the sliding direction of the movable elbow, the upper surface angle θ of the elbow pad 13 may change in the process of sliding the elbow pad. Of course, even in the case of a curved surface, it can be set not only in the front-rear direction (circumferential direction of the curved surface) but also in an oblique direction. That is, the movable elbow slide mechanism of the chair of the present invention always changes the direction of inclination at the same time as the movement of the elbow rest.

Further, in the case of the present embodiment, the position of the intersection of the vertical axis V passing through the center of curvature of the spherical surface or the curved surface and the spherical surface or the curved surface (referred to as the pole 26 or the apex in the present specification) is the support member, that is, the elbow support 11 It is said that it is on the vertical axis passing through the center of the column, that is, the center of the column body 21, but the present invention is not particularly limited to this. It may be set to any position of, or may be set outside the elbow rest receiving portion 12 in some cases. That is, the pole of the spherical surface or the apex of the curved surface does not necessarily have to be the central portion of the elbow rest receiving portion.

The first and second guide grooves 19 and 20 may be any as long as they can constrain the movement of the elbow rest 13 to the desired movement direction and movement locus, and are not particularly limited to those of the illustrated embodiment. do not have. For example, two linear guide grooves are provided side by side in the front-rear direction, and the elbow pad 13 can be slid with respect to the elbow rest receiving portion 12 by the movable shaft 17 and the fixed shaft 18 penetrating the guide grooves 19 and 20. It may be a structure to be connected to. In this case, the elbow pad 13 moves linearly in the front-rear direction.

A pair of guide grooves 19 and 20 for moving the elbow rest 13 in an arbitrary direction are provided on one or both of the facing surfaces (sliding surfaces) of the elbow rest receiving portion 12 and the elbow rest 13. Is provided with shafts 17 and 18 as sliders that slidably connect the surfaces facing each other through the guide grooves 19 and 20 and are relatively movable. In the present embodiment, the guide grooves 19 and 20 and the shafts 17 and 18 serving as sliders fitted thereto are separately arranged on the members constituting the two opposing sliding surfaces. However, the present invention is not particularly limited to this, and a pair of guide grooves 19 and 20 may be arranged on one side, and a pair of slider shafts 17 and 18 may be arranged on the other side. At least two slider shafts may be arranged so as to be separated from each other in the sliding direction and slid. In the present embodiment, the pair of guide grooves 19 and 20 are slightly shifted inward in the width direction by, for example, about 10 mm at the end (front side) than at the start end (rear side). As a result, when the elbow pad moves in the front-rear direction, the position of the elbow pad also shifts in the width direction at the start and end of the movement.

In the case of the present embodiment, the movable shaft 17 is a flanged screw having a flange 17a on the head, and is screwed into a nut 34 fitted in a hexagonal hole 31 of a boss portion 28 formed substantially in the center of the upper slider part 16. Then, the upper and lower slider parts 15 and 16 are slidably connected without being tightened. Further, the flange 17a of the movable shaft 17 is slidably connected by engaging with the edge portion (that is, the step portion 20a) on the back surface side of the second guide groove 20. On the other hand, the fixed shaft 18 is provided with an O-ring 38 on the head side via a roller wheel 37, and the portion of the O-ring 38 is hooked on the edge portion (that is, the step portion 19a) of the first guide groove 19. By being hooked, the O-ring 38 including the roller wheel 37 rolls, so that the first guide groove 19 and thus the upper slider part 16 are supported so as to slide. In the fixed shaft 18, the tapping screw portion at the tip is passed through the first guide groove 19 of the upper slider part 16 and the hole 41 of the sliding member of the lower slider part 15, and the tapping screw boss 22c of the elbow rest receiving portion 12 is passed through. It is fixed by screwing it into. In the case of the present embodiment, rail-shaped stepped portions 19a and 20a in which the O-ring 38 including the roller wheel 37 or the flange 17a is housed are formed on the edges of the first guide groove 19 and the second guide groove 20. .. Therefore, in the shafts 17 and 18, the upper and lower slider parts 15 and 16 are slidably connected to each other by the O-ring 38 or the flange 17a being caught on the step portions 19a and 20a while penetrating the guide grooves 19 and 20. , The elbow pad 13 is fastened so that it can move only when a certain amount of force is applied to the elbow pad 13 by appropriately generating friction between the elbow pad receiving portion 12 and the elbow pad 13. The O-ring 38 including the roller wheel 37 on the head of the fixed shaft 18 enables smooth movement, but a flange structure may be used instead.

The slide structure of the movable elbow of the chair configured as described above is assembled as follows, for example.
First, the lower slider parts (sliding member 36, guide member 35) 15 are fixed to the elevating frame pedestal portion 22a by screwing. In the case of the present embodiment, the lower slider part 15 composed of the sliding member 36 and the guide member 35 is an internal space formed by the step portion 22b inside the pedestal portion 22a of the elbow rest receiving portion 12 in a state of being combined in advance. After placing it in a recess), it is fixed by, for example, screwing.

Next, the threaded portion of the movable shaft 17 is inserted through the hole 44 of the upper slider part 16 and screwed into the nut 34 housed in the hexagonal hole 31 of the boss portion 38, and the movable shaft 17 is screwed to the upper slider part 16. A position where the flange 17a at the lower end of the movable shaft 17 protruding from the upper slider part 16 is passed through the guide groove 20 through the penetration hole 39 of the rear end (that is, the end on the fixed shaft 18 side) of the guide groove 20 of the lower slider part 15. That is, it is passed under the guide member 35 and then slid forward. As a result, the portion of the flange 17a at the lower end of the movable shaft 17 is hooked on the edge / step portion 20a of the guide groove 20 under the guide groove 20 and engages in the axial direction. Since the flange 17a of the movable shaft 17 is wider than the width of the guide groove 20, it cannot be pulled out.

After that, the upper slider part 16 is placed at a position where the guide groove 19 and the tapping screw boss 22c (at the rear end of the elevating frame pedestal portion 22a) are aligned. Then, after placing the wheel (O-ring 38 is attached to the periphery) 37 on the guide groove 19, the fixed shaft 18 is passed from above to pass through the wheel 37 and the guide groove 19 and screwed to the tapping screw boss 22c. do. Finally, the pad 25 including the inner shell 27 is put on the upper slider part 16 and screwed in the hole 43.

After combining the lower slider part 15 and the upper slider part 16 as described above, the movable shaft 17 may move to the intrusive hole 39 even if the elbow pad 13 slides from the front end position to the rear end position. Since it cannot be done, it will not come out of the guide groove 20. That is, since the accoudoir can be made by the method of placing various parts from above, the assembly becomes easy.

According to the movable elbow configured as described above, the upper surface angle of the elbow rest 13 is obtained by sliding the elbow rest 13 in the front-rear direction so as to slide on the upper surface of the elbow rest receiving portion 12, that is, the lower slider part 15. θ can be changed at the same time. That is, the movable elbow of the present embodiment always changes the direction of inclination at the same time as the movement of the elbow pad 13, and the position of the elbow pad 13 can be changed by one operation of sliding the elbow pad 13 in the front-rear direction. And the change of the upper surface angle θ are realized at the same time. Then, for example, in the case of the embodiment of FIG. 2, this amount of change is minimized when one stroke end is reached and maximized when the other stroke end is reached. That is, when the elbow pad 13 is pushed out to the front end position (for example, the state of FIG. 2A), the elbow pad 13 passes through the center of curvature of the spherical surface of the elbow pad receiving portion 12 (that is, the lower slider part 15). With the pole 16 where the line V and the upper surface 24 of the elbow pad 13 intersect as a boundary, the elbow pad 13 is equally divided in the front and the rear, and an extremely gentle spherical surface that resembles a plane is evenly deployed back and forth. As a whole, the posture is kept almost horizontal. On the other hand, when the elbow pad 13 is pulled to the rear end position (state of FIG. 2B), the elbow pad 13 has a vertical line V passing through the center of curvature of the spherical surface of the elbow pad receiving portion 12 and the upper surface 24 of the elbow pad 13. Since most of the elbow rest 13 is arranged rearward in the direction away from the pole 16 with the pole 16 at which the elbow rest 13 intersects, the degree of backward tilt of the upper surface 24 of the elbow pad 13 is increased and the posture (depression angle) of greatly tilting backward is increased. It is maintained in the attitude of taking). That is, the elbow pad 13 is tilted in the process of sliding on the spherical surface of the lower slider part 15, and the upper surface angle is tilted backward while moving the position.

Therefore, in the state of FIG. 2A in which the elbow pad 13 is pushed out to the front end position, for example, the upper surface of the elbow pad 13 forming a gently curved surface with the same inclination in the front-rear direction with the central portion of the elbow support 11 as a boundary. At 24, the forearm of the seated person in the working posture is fully supported, and the weight of the arm resting on the shoulder is reduced. Therefore, most of the forearms are kept almost horizontal and supported with the hands and wrists slightly lifted, so that the seated person's forearms are kept in a posture suitable for tasks such as keyboard operation and mouse operation. Is done. On the other hand, even when the seated person leans against the backrest and the backrest tilts backward, when the elbow rest 13 is pulled to the rear end position (state of FIG. 2B), the position of the elbow rest 13 slides backward. At the same time, the degree of backward tilt increases (most of the upper surface of the elbow rest 13 tilts backward) to follow the seated person who shifts to the reclining posture, so that the elbow rest 13 continues to support the seated person without leaving the forearm. , You can take a comfortable posture.

In this way, by moving the elbow pad 13 on the spherical surface by intentionally moving it or following the movement of the arm, the upper surface angle θ of the elbow pad gradually changes, so that the seated person can use it. You can maintain a comfortable posture regardless of whether you are working or resting.

The form of the optional member of the chair described above is a preferable example, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, the present invention has been mainly described with reference to an example of an elbow pad that slides in the front-rear direction, but the present invention is not particularly limited to this, and the present invention is also applied to other optional members of a chair such as a memo stand. Needless to say, you can do it.

Even when the optional member is a memo stand of a chair, it is possible to set the slide direction not only in the front-rear direction but also in the left-right direction and the diagonal direction as in the case of the armrest. Also in this case, the position and posture, that is, the angle of the upper surface (use surface) of the memo stand can be changed at the same time by the slide of the memo stand in each slide direction. For example, as shown in FIG. 1, if a memo stand member incorporating a memo stand 10 is mounted instead of a pad 25 that covers a part of the support structure of the armrest, for example, the upper slider part 16, the memo stand can be moved in the front-rear direction. At the same time as sliding to, the upper surface of the memo stand, which is the usage surface of the memo stand, tilts forward as the memo stand slides forward or tilts backward as it slides backward, or vice versa, horizontally from the forward tilted or backward tilted state. Can be woken up.

Further, if a support member is attached to the left side of the seat of the chair and a portion having a sliding surface constituting spherical sliding is arranged in the left-right direction of the chair to make the memo stand slidable in the left-right direction, the memo stand which is a movable member The upper surface of the memo stand, which is the surface to be used, tilts to the right as the memo stand slides to the right (that is, the memo stand tilts inward when moved inward in the left-right direction) or tilts to the left as it slides to the left (that is, , The memo base surface tilts outward when moved outward in the left-right direction), or vice versa, it can be raised horizontally from a left-tilted or right-tilted state.

Of course, a portion of the support member attached to a part of the chair such as the seat or back of the chair to slidably support the memo stand, which corresponds to the elbow rest receiving portion in the above-described armrest embodiment, that is, a spherical sliding surface is formed. By arranging the portion having the sliding surface diagonally, it is possible to slide in the diagonal direction (the direction between the front-rear direction and the left-right direction). Also in the case of this embodiment of the memo stand, the upper surface of the memo stand is not necessarily limited to changing the posture from the horizontal state to the tilted state or vice versa with the slide, and the magnitude of the top surface angle θ, that is, the range of gradual inclination. You may change it within.

In addition, the change in the posture of the memo stand is not limited to that at both ends of the slide, and when the memo stand is in the center position of the slide range, the top surface angle θ is kept horizontal or small, and the memo stand is left or right or front and back or back and forth. The memo stand may be tilted as it slides diagonally forward or backward. That is, when the memo stand is slid regardless of the sliding direction of the memo stand, the magnitude of the inclination of the upper surface of the memo stand changes at the same time as the memo stand moves. Of course, even in the case of a curved surface, it can be set not only in the front-rear direction (circumferential direction of the curved surface) but also in an oblique direction.

Further, in the above-described embodiment, the lower slider part 15 of the elbow rest receiving portion 12 and the upper slider part 16 of the elbow rest 13 are slid with the first and second guide grooves 19 and 20 and the pair of shafts 17 and 18. The guide means and the connecting means that are movably and mechanically connected and supported are also used, but the present invention is not particularly limited, and the connecting means and the guide means may be separated and made independent. In some cases, the two members may be movably connected to each other by the attractive force of a non-mechanical connecting means, for example, a magnet having a high holding force such as a samarium cobalt magnet or a neodymium magnet. In this case, the guide groove is not required and is fixed at the position where it is attracted by the magnet.

Further, in the above-described embodiment, the example of the movable member that reciprocates substantially along the horizontal plane has been mainly described, but the present invention is not particularly limited to this, and in some cases, it is along an arbitrary angle such as a slope or a vertical plane. It can also be applied to an optional member of a chair on which a movable member slides.

Further, in the above-described embodiment, the sliding surface of the lower slider part 15 and the upper slider part 16 constituting the sliding portion is a spherical surface, and can be slidable in an arbitrary direction, that is, in the front-rear direction and the left-right direction. It is not limited, and may be a so-called curved surface such as an arch in the front-rear direction or an arch in the left-right direction. It goes without saying that this also applies to other optional members of the chair, such as a memo stand.

(Spring support structure)
Further, FIGS. 10 to 16 show an embodiment of the spring support structure. This spring support structure is applied to the tilt mechanism, and is incorporated between the synchro frame 3 and the back frame 5, and spring force is applied so that the back frame 5 is always urged forward. There is. The back frame 5 is swingably connected to the back frame mounting seat 54 at the rear end of the synchro frame 3 by a connecting shaft 65, and is swingably supported within a certain range.

Here, in the case of the present embodiment, as shown in FIGS. 11 and 12, the synchro frame 3 increases the mechanical rigidity of the structure, particularly the torsional rigidity, and accommodates the synchro gas spring 8 inside, for example. The rear ends of the pair of bow-shaped left and right plates 50 are connected by a bent plate material 53, while the front end side is connected to the swing shaft 65 by a connecting pin 64 and the middle is connected by a rotating shaft 63, so that there is no bottom. It is formed in a box-shaped frame. Then, for example, a pair of left and right back frame mounting seats 54 are formed at the rising portion of the rear end portion developed in a T shape. Further, between the back frame mounting seats 54, a back support seat 51 for mounting the synchro frame mounting seat 130 at the lower end of the backrest 6 is formed of a part of the bent plate material 53. The back support seat 51 is formed on a seat surface having an angle and shape suitable for the synchro frame mounting seat 130 of the back outer shell 90, for example, a flat surface, and a hole for passing a fastening bolt formed in the synchro frame mounting seat 130. Screw holes 61 are provided at positions and intervals corresponding to 144. In the case of the present embodiment, the screw hole 61 is formed by fixing the nut to the back surface side of the back support seat 51 by welding or the like.

Further, the synchro frame 3 of the present embodiment is provided with a flat plate portion 52 developed in front of the back support seat 51 in a plane orthogonal to the back support seat 51 for reinforcement. The flat plate portion 52 is provided with a space 59 in which the operating mechanism 67 of the synchro gas spring 8 is housed so as not to interfere with the operating mechanism 67 of the synchro gas spring 8 with a lock mechanism. Further, a space 60 for equipping the tilt spring mechanism 9 is provided. The left and right plates 50 are connected by a strip-shaped bridge portion 56 left between the space 59 in which the synchro gas spring 8 is mounted and the mounting space 60 in the tilt spring mechanism 9. The bridge portion 56 is used as one spring mount of the tilt spring mechanism 9, that is, one spring mount receiving portion (hereinafter, referred to as a first spring mount receiving portion 46) that supports the first spring mount 45. It is a flat plate portion having an end face 57 orthogonal to the direction in which the spring force acts and two planes 57a along the direction in which the spring force acts. Reference numeral 66 in the drawing is a shaft for attaching the operation mechanism 67 of the synchro gas spring 8.

On the other hand, the back frame 5 is provided with a spring mount receiving portion 49 at the central portion of the lower end arm portion 68. The spring mount receiving portion 49 is, for example, a semicircular convex portion or a convex portion, and is formed on the wall surface 133 at the end of the concave portion 132. Further, the lower end arm portion 68 of the back frame 5 is provided with a claw portion 69 that protrudes forward and crosses under the synchro frame 3 and protrudes outward. The claw portion 69 is caught by the claw portion 55 at the lower end of the back frame mounting seat 54 of the synchro frame 3 when the back frame 5 is tilted forward, and the frame near the back frame mounting seat 54 of the synchro frame 3 when tilted backward. It is caught on the lower edge of 50 to regulate the backward tilt position. That is, the range of tilt operation of the back frame 5 is restricted by the engagement between the claw portion 55 at the lower end of the back frame mounting seat 54 and the synchro frame 3.

In the case of the present embodiment, the tilt spring mechanism 9 is composed of one compression coil spring 47 and a pair of spring mounts 45 and 46 arranged at both ends thereof, and the spring mounts 45 and 46 at both ends are interposed. It is mounted between the rear portion of the synchro frame 3 and the lower end arm portion 68 of the back frame 5.

One spring mount (hereinafter referred to as the first spring mount 45) has a slit groove 73 that fits into a part of the plate material of the synchro frame 3, for example, the bridge portion 56, as shown in FIGS. 15 and 16, for example. On the opposite side, there is a shaft portion 70 into which the spring 47 is fitted. The first spring mount 45 has a seat 71 for supporting the spring 47 and an arcuate peripheral wall portion 76 around the shaft portion 45, and supports and supports the spring 47. In the case of the present embodiment, the shaft portion 70 is a hollow shaft hollowed out in order to reduce the weight of the parts and make the wall thickness uniform to prevent the occurrence of sink marks. The first spring mount 45 is fixed by using the bridge portion 56 of the synchro frame 3, that is, the bridge portion 56 is used as the first spring mount receiving portion 48, and the bridge portion 56 of the first spring mount 45 is used. It has a slit groove 73 that is slightly wider than the wall thickness. By fitting the slit groove 73 into the bridge portion 56, the force applied to the spring is applied in the direction orthogonal to the plate thickness of the bridge portion 56, so that the moment of inertia of area becomes large. In the present embodiment, the bridge portion 56 is used for fixing, but the present invention is not particularly limited to this, and the end face 57 orthogonal to the direction in which the spring force acts and two along the action direction. As long as it has a flat plate portion having a flat surface 57a, the flat plate portion can be used not only as the bridge portion 56 described above but also in another portion of the synchro frame 3 or the main frame 2 as a mount receiving portion. Is possible.

In the case of the present embodiment, the slit groove 73 of the first spring mount 45 comes into contact with the end surface 57 of the bridge portion 56 between the pair of flanges 72 that sandwich the flat plate member / bridge portion 56 and the flanges 72 to form a spring. It is preferable that the flanges 72 have a pressure receiving surface 74 for receiving such a force, and the distance between the pair of flanges 72 is slightly wider than the plate thickness of the bridge portion 56 to cause rattling. As a result, even if the sliding shaft does not exist between the first and second spring mounts 45 and 46, the structure can be configured to prevent the spring 47 from buckling while absorbing the arc motion of the spring 47 to some extent. Further, as shown in the figure, the first spring mount 45 has a flange 72 portion formed in a U shape, and has three surfaces including a pressure receiving surface 74 and two side surfaces 75 orthogonal to the pressure receiving surface 74. Is preferable. Similarly, the bridge portion 56 (that is, the first spring mount receiving portion 48) also has a total of 3 of the end surface 57 facing the pressure receiving surface 74 of the first spring mount 45 and the two side surfaces 58 orthogonal to each other at both ends thereof. It is preferable to have a surface. As a result, the first spring mount 45 and the bridge portion 56 are simultaneously in contact with the three sides of the direction in which the spring force is applied and the two sides orthogonal to the spring force, and are sandwiched by the three surfaces in the vertical direction. Not only in the left-right direction, the movement can be regulated with some play, so even if there is no sliding shaft between the first and second spring mounts 45 and 46, the spring 47 can be further adjusted. The structure can prevent the spring from buckling while absorbing the arc motion to some extent. A rib for reinforcement is provided between the flange 72 and the seat 71.

The other spring mount (hereinafter referred to as a second spring mount 46) is a spring mount receiving portion (hereinafter referred to as a second spring mount 46) provided on the lower end arm portion 68 of the back frame 5, as shown in FIGS. 15 and 16, for example. A semicircular recess 77 that fits into the spring mount receiving portion 49 of 2) is provided on the rear surface side, and a shaft portion 78 into which the spring is fitted is provided on the front surface side. In the case of the present embodiment, the second spring mount 46 has a shaft portion 78, a recess 77, and a rectangular seat portion 79 that supports the spring at the boundary between them. It suffices that the second spring mount receiving portion 49 has at least a convex portion that fits with the concave portion 77 of the second spring mount 46, but in the case of the present embodiment, as shown in FIG. A semicircular convex portion 49 is formed so as to be distributed to the left and right on the wall surface 133, which is the end of the concave portion 132 of the lower end arm portion 68 of the back frame 5, and is formed on the side wall surface of the concave portion 132. The spring mount 46 is provided so as to regulate the displacement in the left-right direction. Therefore, by fitting the convex portion of the second spring mount receiving portion 49 of the lower end arm portion 68 of the back frame 5 and the concave portion 77 on the rear side of the second spring mount 46, the movement in the left-right direction is restricted. It is also supported so that it can swing in the vertical direction.

Further, the second spring mount 46 and the second spring mount receiving portion 49 are not limited to the combination of the above-mentioned unevenness, for example, the combination of the unevenness may be reversed, or the combination of the hemispherical convex portion and the concave portion may be reversed. In some cases, it may be used as a shaft portion (not shown). Further, in some cases, a hook may be used instead of the recess of the second spring mount. In any case, if the combination of the first spring mount 45 and the first spring mount receiving portion 48 is provided in at least one of them, the arc motion of the spring 47 is suppressed to some extent. The buckling of the spring 47 can be suppressed even if there is no sliding shaft / pin between the 46s.

According to the spring support structure according to the above-described embodiment, the first spring is held by loosely sandwiching the flat plate portion, for example, the bridge portion 56, in the slit groove 73 between the pair of flanges 72 of the first spring mount 45. Since the mount 45 itself can be prevented from substantially rotating, the sliding shaft / pin that prevents the spring 47 from buckling can be omitted. That is, the number of parts that support the spring 47 can be reduced to two, that is, only the spring mounts 45 and 46 at both ends. Moreover, since the flat plate portion of the synchro frame 3, for example, the bridge portion 56 is used so that a force is applied in a direction orthogonal to the plate thickness direction (vertically in the width direction), the cross-sectional coefficient becomes large and the strength becomes strong.

The above-mentioned form of the spring support structure is an example of a preferable form of the present invention, but the present invention is not limited to this, and various modifications can be carried out without departing from the gist of the present invention. For example, the above-described embodiment has been mainly described with reference to an example in which the spring support structure is applied to the tilt mechanism, but the present invention is not particularly limited to this, and the spring support structure is oscillatingly connected to each other on one axis. Needless to say, any spring mechanism that is hung between two members and applies a spring force between the two members can be applied to other spring support structures such as a spring support structure of a reaction force mechanism. Even in this case, if one of the spring mounts of the spring mechanism arranged between the main frame 2 and the synchro frame 3 is a block that fits with the flat plate portion, the spring buckles while allowing some rotation. Since it is possible to hold down the sliding shaft / pin between the spring mounts, it is possible to omit the sliding shaft / pin. Moreover, since one of the spring mount receiving portions can be configured by using a part of the flat plate material, it is possible to omit the connecting shaft and the like for receiving the spring mount. This also makes it possible to reduce costs. Further, by making the other spring mount a block having a concave portion or a convex portion that fits with a convex portion or a concave portion of a spherical surface or a curved surface, it is effective in further simplifying the structure.

Further, in the above-described embodiment, the first spring mount 45 is in a form of simultaneously restraining the three surfaces 57 and 58 of the first spring mount receiving portion 48, but the present invention is not particularly limited to this. In some cases, the structure may be such that the spring abuts only on the front surface facing in the direction in which the compressive force of the spring is applied. In this case, it is preferable to prevent the first spring mount 45 from being displaced in the left-right direction by other means.

Further, in the above-described embodiment, the bridge portion 56, which is a part of the flat plate portion 53 of the synchro frame 3, is used as the first spring mount receiving portion 48, but the present invention is not particularly limited to this, for example, a pipe. It is also possible to use a part of a cylindrical member. Two planes, more preferably two planes parallel to each other, may be formed in the pipe so as to be sandwiched by the slit groove 73 between the pair of flanges 72 of the first spring mount. In other words, at least one of the spring mount and the spring mount receiver is a first mount receiver having a plane orthogonal to the direction in which the spring force acts and two planes along the direction in which the spring force acts. It has a pair of flanges that sandwich the plane of the first spring mount receiving portion, and a pressure receiving surface that comes into contact with the first mount receiving portion between the flanges and receives the force applied to the spring, and is between the pair of flanges. It may be configured with a first spring mount having a slit in which the distance between the planes is wider than the distance between the planes.

(Back lean tilt mechanism)
17 to 21 show an example of an embodiment of the backrest tilt mechanism. The backrest tilt mechanism according to this embodiment supports the lower end portion and the upper portion of the backrest 6 by the synchro frame 3 and the back frame 5 swingably attached to the synchro frame 3. Specifically, for example, the synchro frame mounting seat 130 at the lower end of the backrest 6 is fixed to the backrest 51 of the synchro frame 3, while the pocket portion 135 provided on the upper back surface of the backrest is attached to the front surface of the back frame 5. It is supported so as to be hooked on the locking member 134 of the above. Therefore, in the backrest 6, a part of the engaging member 134 between the pocket portion 135 at the upper portion of the backrest 6 and the locking member 134 of the back frame 5 is one of the pocket portions 135 when the back frame 5 is tilted. Tilt is allowed because it slips before it comes into contact with the portion and allows relative movement. In the present embodiment, the synchro frame 3 and the back frame 5 form a so-called back support rod, the synchro frame 3 corresponds to the lower back support rod, and the back frame 5 corresponds to the upper back support rod.

The back frame 5 is made of a resin molded product such as polypropylene containing glass fiber, and its lower portion is swingably connected by a connecting shaft 65 penetrating the hole 62 of the back frame mounting seat 54 at the rear end of the synchro frame 3. At the same time, the spring 47 of the tilt mechanism interposed between the synchro frame 3 is urged in the direction of tilting forward, that is, in the direction of pushing back the backrest 6 with respect to the seated person.

On the upper part of the front surface of the back frame 5 (that is, the surface facing the back outer shell 90), a T-shaped claw having a shaft portion 134a protruding forward and a protruding portion 134b protruding in the left-right direction (hereinafter, T-shaped clerk) (Called a stop member 134) is provided. The T-shaped locking member 134 is fitted in the pocket portion 135 on the back surface of the back outer shell 90, and functions so as not to be detached in the front-rear direction after being fitted. The T-shaped locking member 134 does not get caught in the vertical direction (insertion / removal direction) with respect to the pocket portion 135, and the bottom portion 137 or the peripheral portion 136 of the pocket portion 135 overhangs in the front-rear direction (direction orthogonal to the insertion / removal direction). The backrest 6 is provided so as not to separate from the back frame 5 by engaging with the portion. The T-shaped locking member 134 is provided with a so-called lightening (also referred to as meat stealing) in which a recess 134c is intentionally formed in the central shaft portion 134a so that the wall thickness is formed to be constant. That is, consideration is given so that sink marks do not occur on the back side of the back frame 5 during injection molding. Moreover, since the backrest tilt mechanism described in Patent Document 1 has a large number of parts, it has a thick configuration, and it is difficult to obtain a neat appearance. However, according to the present embodiment, the number of parts is small and thin. Since it can be shaped, a clean appearance can be obtained.

On the other hand, the backrest 6 is not limited to a specific structure and shape, but in the case of the present embodiment, for example, a synthetic resin back outer shell 90 supported by the back frame 5 and the back outer shell 90. It is composed of a back inner shell 80 made of synthetic resin attached to the shell 90. The back inner shell 80 is gathered by arranging a cushion material such as urethane foam on the front side and then covering it with upholstery, and fixing the edge of the upholstery turned to the back side with staples or the like. It is configured as one part. The back outer shell 90 is made of a resin material having a certain degree of flexibility and rigidity as a structure that supports the back, and by attaching the back inner shell 80, a backrest surface and a body support surface are formed. It is provided in. The back inner shell 80 and the back outer shell 90 are integrated by being detachably joined with a claw and a clip.

In the back outer shell 90, a downward pocket portion 135 for fitting a T-shaped locking member 134 projecting to the front side of the back frame 5 so as to be inserted from below is integrally molded by injection molding using a slide mold. Has been done. The pocket portion 135 supports, for example, the inverted U-shaped peripheral edge portion 136 that supports the back surface side of the T-shaped locking member 134 and the front surface side of the T-shaped locking member 134 that occupies the inside of the peripheral edge portion 136. It is composed of an I-shaped bottom portion 137, and a space for fitting the T-shaped locking member 134 is formed between the inverted U-shaped peripheral edge portion 136 and the I-shaped bottom portion 137. In the case of the back outer shell 90 of the present embodiment, since a space for pulling out the slide mold for injection molding the pocket portion 135 is required, the bottom portion 137 has an I shape surrounded by the punch. That is, the pocket portion 135 is a T-shaped locking member by providing a step in the front-rear direction between the inverted U-shaped peripheral edge portion 136 and the I-shaped bottom portion 137 between them during injection molding of the back outer shell. A space for fitting the 134 is formed. In addition, in order to smooth the movement of the T-shaped locking member 134, a rail-shaped protrusion 138 slightly higher than the peripheral surface is formed at the bottom of the pocket portion 135 to reduce the contact area. There is.

A locking claw 139 that serves as a hook for preventing the T-shaped locking member 134 from coming off is formed near the entrance of the pocket portion 135. The locking claw 139 bends in the front-rear direction, has a return portion (sear hook) 140 protruding to the back side, and is an entrance of an internal space for accommodating the T-shaped locking member 134 of the pocket portion 135. Narrow. When the T-shaped locking member 134 is inserted, the tapered surface 141 comes into contact with the tapered surface 141 and is pushed into a vacant space in front of the T-shaped locking member 134 so that the T-shaped locking member 134 is not caught. When the T-shaped locking member 134 abuts, it functions as a retaining member.

The backrest 6 in the present embodiment is formed, for example, in a shape that is convex toward the front in a lateral view (that is, a dogleg shape), and is curved so as to be convex toward the rear in a plan view. Is doing. Then, the synchro frame mounting seat 130 at the lower end of the back outer shell 90 is fastened to the synchro frame 3 with screws 131, and the upper pocket portion 135 is hooked on the T-shaped locking member 134 of the back frame 5. The part between the two connections is supported so as to be separated from the backrest in lateral view. Further, in the present embodiment, the synchro frame mounting seat 130 at the lower part of the back outer shell 90 is screwed to the screw hole 61 of the back receiving seat 51 at the rear end of the synchro frame 3, while the upper pocket portion 135 is the back frame. Since it is only hooked on the T-shaped locking member 134 of 5, the back frame 5 tilts (tilts) with respect to the synchro frame 3, so that the T-shaped locking member 134 of the back frame 5 and the backrest pocket portion. It will be displaced or slipped from 135. Therefore, a resin spring 142 is provided at the back of the pocket portion 135, that is, at the portion where the upper end surface of the T-shaped locking member 134 of the back frame 5 abuts, so as to mitigate the impact force and collision noise at the time of abutment. Has been done. As shown in FIG. 21, for example, the resin spring 142 has a shape like a crushed ring and is provided with a mounting claw 143 having a barb on the upper surface side. As shown in FIG. 22, the resin spring 142 is a part of the pocket portion 135 with which a part of the engaging member 134 that rises relatively at the back of the pocket portion 135, that is, when the back frame is tilted, comes into contact with the spring 142. It is fixed to the back frame 5 by fitting the mounting claw 143 into the recess 145 (upper side serving as the ceiling). The resin spring 142 is provided so that the return of the mounting claw 143 is caught in the recess 145 so that the resin spring 142 will not fall off unless it is intentionally removed.

Further, grease may be applied between the inner surface of the pocket portion 135 and the T-shaped locking member 134 so that dust is not generated inside the pocket portion 135 due to rubbing against each other. Even in this case, since the resin spring 142 is caught on the back outer shell 90 at the return portion of the mounting claw 143, it does not fall off due to the influence of grease application.

The back outer shell 90 is fixed by screwing the synchro frame mounting seat 130 to the synchro frame 3 and fitting and hooking the upper pocket portion 135 into the T-shaped locking member 134 of the back frame 5. Therefore, when the backrest 6 is pulled forward and pulled out (or when a force for unconsciously removing it is applied), the backrest 6 is pulled away from the back frame 5 because it is in the direction of being caught by the T-shaped locking member 134. It is not possible. On the other hand, when the backrest 6 is pulled straight up according to the procedure and pulled out (when a force for intentionally removing it is applied), the back outer shell 90 does not get caught in the T-shaped locking member 134 of the back frame 5. , The backrest 6 can be separated from the back frame 5.

The above-mentioned form of the backrest tilt mechanism is an example of a preferable form of the present invention, but the present invention is not limited to this, and various modifications can be carried out without departing from the gist of the present invention. For example, in the backrest tilt mechanism of the above-described embodiment, the T-shaped locking member 134 is formed on the front surface of the back frame 5, and the pocket portion 135 is formed on the back side of the backrest 6, but in some cases, the back frame 5 A pocket portion 135 may be formed on the front surface, and a T-shaped locking member 134 may be formed on the back surface side of the backrest 6. In addition, the backrest has been explained by giving an example of a structure in which a cushion is wrapped with a stretch cloth, but the present invention is not particularly limited to this, and a mesh-like stretch cloth is stretched on the back frame or a mesh-like structure is made of resin. It may be a so-called resin mesh type having a backrest surface at a portion formed on the surface. Further, the backrest support may have various shapes and structures, and is not limited to the shell-shaped one as shown in the present embodiment. For example, the support may be mainly composed of a frame.

(Shell engagement structure)
The backrest 6 has an outer shell 90 formed of resin and an inner shell 80 formed of resin and arranged on the front side of the outer shell 90 (FIG. 24). Although not shown, a back cushion is attached to and arranged on the front surface of the inner shell 80 and is covered with a skin material.

The outer shell 90 is a resin member having a size sufficient to support the back of the seated person, and in the example shown in the figure, the outer shell 90 has a shape (that is, a dogleg shape) that is convex toward the front when viewed from the side. ) And in a plan view, it is formed in a curved shape so as to be convex toward the rear.

The inner shell 80 is a member made of resin, and is formed in an uneven / curved shape similar to the outer shell 90.

The outer shell 90 is provided with a plurality of locking pieces 92 at a portion near the upper end and a plurality of engaging recesses 93 are formed at a portion near the lower end as a structure for attaching the inner shell 80 to the outer shell 90. Will be done.

The inner shell 80 has a structure for attaching the inner shell 80 to the outer shell 90, and the locking hole 83 into which the locking piece 92 of the outer shell 90 is inserted and engaged is the locked portion near the upper end. The engaging protrusions 85, which are formed at positions facing each of the pieces 92 and are inserted into and engaged with the engaging recesses 93 of the outer shell 90, face each of the engaging recesses 93 at a portion near the lower end. Prepare for the position.

The locking piece 92 of the outer shell 90 has a hook shape and is formed so as to project forward from the front surface of the outer shell 90.

The locking piece 92 has a joint portion 92a that projects forward from the front surface of the outer shell 90, and a locking claw portion 92b that extends upward from the front end portion of the joint portion 92a.

In the example shown in the figure, four locking pieces 92 arranged apart from each other in the left-right direction are provided at a portion near the upper end of the outer shell 90.

Of the four locking pieces 92 that are lined up apart from each other in the left-right direction, the two on the left and right ends are particularly enhanced in the function of preventing them from coming off after being inserted into the locking holes 83 on the inner shell 80 side and engaged. The bent locking pieces 92X and 92X are formed and provided, and the two sandwiched between the bent locking pieces 92X and 92X are formed and provided as the bent locking pieces 92Y and 92Y.

The bent locking piece 92X is formed so that the connecting portion between the lower surface of the joint portion 92a and the front surface of the locking claw portion 92b forms a corner portion 92c, that is, the tip portion of the lower surface of the joint portion 92a is curved. Instead, it is formed in a bent shape (Fig. 25).

On the upper side of the inner shell 80, the portion near the upper end of the inner shell 80 is lowered from above the locking piece 92 of the outer shell 90, and the locking piece 92 is allowed to enter the locking hole 83, and then the outer shell 90 is inserted. With the locking claw portion 92b of the locking piece 92 exposed to the front side of the inner shell 80 and the joint portion 92a of the locking piece 92 positioned in the locking hole 83, the outer Attached to shell 90.

With the locking piece 92 inserted into the locking hole 83 and the locking claw portion 92b exposed on the front side of the inner shell 80, the locking hole of the inner shell 80 is provided by the rear surface of the locking claw portion 92b. The locking portion 87 (in other words, above the locking hole 83) forming the upper edge of the 83 is held so as to be pressed down.

At this time, the bent locking piece 92X has a shape such that the connecting portion between the lower surface of the joint portion 92a and the front surface of the locking claw portion 92b forms a corner portion 92c and the tip portion of the lower surface of the joint portion 92a is bent. By doing so, the lower surface of the joint portion 92a is sufficiently overhanging to the front, and the lower end edge 83a of the locking hole 83 is engaged in the front-rear direction. Therefore, the upper portion of the inner shell 80 (particularly). , The peripheral portion of the locking hole 83) is pulled forward and the lower end edge 83a of the locking hole 83 is slightly displaced forward, but the lower end edge 83a of the locking hole 83 is joined to the bent locking piece 92X. It is difficult to cross the corner 92c of the front end of the portion 92a. As a result, the locking hole 83 is hard to come off from the bent locking piece 92X (in other words, the bent locking piece 92X is hard to come off from the locking hole 83), and the upper part of the inner shell 80 is the outer shell 90. It becomes difficult to come off from.

In particular, it is conceivable that the inner shell 80 is designed and formed so that the upper edge of the inner shell 80 is higher than the upper edge of the outer shell 90. In such a case, the upper end portion of the inner shell 80 is considered. It is also assumed that only the upper end portion of the inner shell 80 is grasped (that is, the upper edge of the outer shell 90 is not grasped) and pulled forward (or pushed forward). On the other hand, the structure of the bent locking piece 92X, which can exert the effect of being hard to come off / hard to come off from the locking hole 83, is useful.

The locking hole 83 of the inner shell 80 cannot be easily disengaged from the bent locking piece 92X of the outer shell 90, but it disengages when pulled by an appropriate force.

When the peripheral portion of the locking hole 83 to which the bending locking piece 92X is inserted and engaged is pulled, the lower end edge 83a of the locking hole 83 slides against the lower surface of the joint portion 92a of the bending locking piece 92X. When it is moved and pulled further with an appropriate force, the lower end edge 83a gets over the corner portion 92c, and the locking hole 83 is disengaged from the bending locking piece 92X.

On the other hand, the curved locking piece 92Y is formed so that the connecting portion between the lower surface of the joint portion 92a and the front surface of the locking claw portion 92b forms the curved portion 92d, that is, the tip portion of the lower surface of the joint portion 92a is bent. It is formed in a curved shape instead of a curved shape (FIG. 26). The curved locking piece 92Y is formed so that the connecting portion between the lower surface of the joint portion 92a and the front surface of the locking claw portion 92b forms a slope, that is, the tip portion of the lower surface of the joint portion 92a is formed in a slope shape. It may be done.

In the curved locking piece 92Y, the connecting portion between the lower surface of the joint portion 92a and the front surface of the locking claw portion 92b forms a curved portion 92d so that the tip portion of the lower surface of the joint portion 92a is curved. As a result, when the upper portion of the inner shell 80 (particularly, the peripheral portion of the locking hole 83) is pulled forward and the lower end edge 83a of the locking hole 83 shifts forward, the lower end of the locking hole 83 The edge 83a easily crosses the curved portion 92d of the front end portion of the joint portion 92a of the curved locking piece 92Y. As a result, the locking hole 83 is easily disengaged from the curved locking piece 92Y (in other words, the curved locking piece 92Y is easily disengaged from the locking hole 83), and the upper portion of the inner shell 80 is the outer shell 90. It becomes easy to come off from.

In the example shown in the figure, four locking pieces 92 are provided as a whole so that two on the left and right ends are bent locking pieces 92X and the other two are curved locking pieces 92Y. The number of the 92 as a whole and the number and arrangement of the bent locking piece 92X and the curved locking piece 92Y are not limited to the examples shown in the figure, and for example, the inner shell 80 and the outer shell 90. Considering that the engaging force can be secured, an appropriate number and arrangement method are appropriately set.

By appropriately arranging the bending locking piece 92X and the bending locking piece 92Y, the coupling force between the inner shell 80 and the outer shell 90 is appropriately secured, and for parts replacement and maintenance, etc. When the inner shell 80 is removed from the outer shell 90, labor saving and efficiency can be achieved by avoiding extra work, and the parts are damaged during removal, which is a substitute. It is possible to avoid the problem of needing replacement or repair. That is, the engagement / connection that is removable and does not easily come off is realized.

In the engaging structure of the chair parts of the present embodiment, the outer shell 90 is provided with the engaging recess 93, and the inner shell 80 is detachably elastically deformed and engaged with the engaging recess 93. A turning suppressing portion 86 that reduces or suppresses the rotation of the engaging convex portion 85 with respect to the engaging concave portion 93 in a state where the engaging convex portion 85 and the engaging concave portion 93 are engaged with the inner shell 80. Is provided.

The engaging protrusions 85 of the inner shell 80 are formed as being integral with the inner shell 80 (thus, as being formed of resin) so as to project from the rear surface to the rear of the inner shell 80.

The engaging convex portion 85 is a pair of joint support portions 85a, 85a projecting from the rear surface of the inner shell 80, and a pair of hook portions 85b, 85b connected to the rear end portions of the pair of joint support portions 85a, 85a, respectively. And a pair of inclined portions 85c and 85c that are connected to the rear end portions of the pair of hooking portions 85b and 85b, respectively (FIG. 27).

The pair of joint support portions 85a and 85a are formed so as to project from the rear surface of the inner shell 80 so as to face each other while being separated from each other backward.

The pair of hooking portions 85b and 85b are formed in such a manner that they are inclined backward from the rear end portions of the pair of joint support portions 85a and 85a, respectively, so as to be separated from the other joint support portion 85a. ..

The pair of inclined portions 85c and 85c are inclined backward so as to approach the other hooking portion 85b from the rear end portions of the pair of hooking portions 85b and 85b, respectively, and these pair of inclined portions are extended backward. It is formed in such a manner that the rear ends of 85c and 85c are joined to each other.

The engaging convex portion 85 of the example shown in the figure is formed as having a house shape or an arrow shape in a cross-sectional view according to the above configuration.

In the example shown in the figure, three engaging protrusions 85 are provided at a portion near the lower end of the inner shell 80 so as to be spaced apart from each other in the left-right direction. The number of engaging protrusions 85 is not limited to the example shown in the figure, and is appropriate after considering that the engaging force between the inner shell 80 and the outer shell 90 can be secured, for example. The number is set appropriately.

In the example shown in the figure, with respect to the three engaging convex portions 85 arranged apart from each other in the left-right direction, the forming directions are different between the engaging convex portions 85 and 85 at both left and right ends and the engaging convex portions 85 in the middle. Specifically, the left and right ends are in the directions in which the pair of joint support portions 85a and 85a, the hook portions 85b and 85b, and the inclined portions 85c and 85c are opposed to each other and are elastically deformed as the engaging convex portions 85. The engaging convex portions 85 and 85 of the above are in the vertical direction, while the engaging convex portions 85 in the middle are in the horizontal direction.

The forming direction of the engaging convex portion 85 is adjusted so that the plurality of engaging convex portions 85 can respond firmly to the external force applied to the inner shell 80 as a whole, or is given by the portion of the inner shell 80. The direction of the external force may be assumed and adjusted in consideration. The forming directions of the plurality of engaging protrusions 85 may all be the same.

The engaging recess 93 of the outer shell 90 is formed on the front side of the outer shell 90 as an integral part of the outer shell 90 (and thus formed of resin).

The engaging recess 93 is configured such that the engaging convex portion 85 of the inner shell 80 is inserted and the hook portion 85b is caught and engaged.

The engaging recess 93 has a pair of overhanging portions 93a, 93a protruding from the front surface of the outer shell 90, and a pair of claw portions 93b, 93b provided at the front end portions of the pair of overhanging portions 93a, 93a, respectively. (Fig. 27).

The pair of overhanging portions 93a, 93a are formed so as to project forward from the front surface of the outer shell 90 while being separated from each other and facing each other.

The pair of claw portions 93b, 93b are formed in such a manner that they bend from the front end portions of the pair of overhanging portions 93a, 93a, respectively, toward the other overhanging portion 93a.

The pair of claw portions 93b, 93b are separated from each other, and the space between the pair of claw portions 93b, 93b serves as an opening as an engaging recess 93, and the engaging recess 93 faces forward, that is, toward the inner shell 80. Formed as having all openings.

On the lower side of the inner shell 80, the portion near the lower end of the inner shell 80 is pushed from the front of the engaging recess 93 of the outer shell 90, and the engaging convex portion 85 is made to enter the engaging recess 93 to engage. The pair of inclined portions 85c, 85c of the convex portion 85 are positioned between the pair of overhanging portions 93a, 93a of the engaging concave portion 93, and the pair of joint support portions 85a, 85a of the engaging convex portion 85 are engaged recesses. The pair of hook portions 85b, 85b of the engaging convex portion 85 is positioned between the pair of claw portions 93b, 93b of 93, and the pair of hook portions 85b, 85b of the engaging convex portion 85 are moved to the inner edges of the pair of claw portions 93b, 93b of the engaging concave portion 93, respectively. They are attached to the outer shell 90 in a state where they are hooked and engaged with each other.

When the engaging convex portion 85 enters the engaging concave portion 93, the pair of inclined portions 85c, 85c of the engaging convex portion 85 form the opening of the engaging concave portion 93, respectively. A pair of joint support portions 85a, 85a, hook portions 85b, 85b, and inclined portions 85c, 85c, which are slid with respect to the inner edge and are opposed to each other while being separated from each other, are engaged with each other in the opposite directions. By elastically deforming as the portion 85, the hook portion 85b gets over the claw portion 93b together with the inclined portion 85c and enters between the pair of overhanging portions 93a and 93a.

Here, the engaging convex portion 85 is orthogonal to the direction in which the pair of joint support portions 85a, 85a, the hook portions 85b, 85b, and the inclined portions 85c, 85c face each other (referred to as "elastic deformation direction"). When pulled along the direction, a strong engaging force can be exerted on the engaging concave portion 93 (FIG. 28), whereas the inner shell 80 around the engaging convex portion 85 is rolled / turned. When a large external force acts to rotate with respect to the engaging recess 93, it is easy to disengage from the engaging recess 93, and in particular, the inner shell 80 around the engaging convex portion 85 is rolled / turned along the elastic deformation direction. When an external force (shown in the figure, it is rolled / turned along the paper surface of FIG. 29) acts to rotate with respect to the engaging recess 93, it easily disengages from the engaging recess 93.

That is, with respect to the engagement / connection between the engaging convex portion 85 and the engaging concave portion 93, the lower end side portion of the inner shell 80 (particularly, the peripheral portion of the engaging convex portion 85) is pulled forward along the front-rear direction. In this case, the engaging convex portion 85 does not easily disengage from the engaging concave portion 93 by exerting a strong engaging force.

On the other hand, when the lower end portion of the inner shell 80 (particularly, the peripheral portion of the engaging convex portions 85 at both left and right ends) is pulled from the front to the top or the bottom so as to be rolled up along the vertical vertical surface in the front-rear direction. The engaging protrusions 85 (FIG. 24) at both the left and right ends, whose elastic deformation direction is the vertical direction, are likely to come off from the engaging recesses 93.

Further, when the lower end side portion of the inner shell 80 (particularly, the peripheral portion of the engaging convex portion 85 in the middle) is pulled from the front direction to the left direction or the right direction so as to be turned along the horizontal plane in the front-rear direction, elastic deformation occurs. The middle engaging convex portion 85 (FIG. 24) whose direction is the left-right direction is easily disengaged from the engaging concave portion 93.

Therefore, in order to reduce or suppress the rotation of the engaging convex portion 85 with respect to the engaging concave portion 93 in the state where the engaging convex portion 85 and the engaging concave portion 93 are engaged, each engagement on the rear surface of the inner shell 80 is performed. A turn suppressing portion 86 is formed at a position adjacent to / near the convex portion 85.

The turning suppressing portion 86 can reduce or suppress the rotation of the engaging convex portion 85 with respect to the engaging concave portion 93 in a state where the engaging convex portion 85 and the engaging concave portion 93 are engaged. The inner shell 80 is not limited to a specific aspect, and for example, it hinders the displacement of the inner shell 80 with respect to the outer shell 90, and particularly the engaging convex portion 85 of the inner shell 80 and the periphery of the engaging convex portion 85. Examples include a mode of suppressing deformation of a part.

The turning suppressing portion 86 hits the front surface of the outer shell 90 when the engaging convex portion 85 of the inner shell 80 or the peripheral portion of the engaging convex portion 85 is about to be displaced or deformed. It may be provided with the intention of preventing the engaging convex portion 85 of the inner shell 80 and its peripheral portion from being displaced or deformed by being in contact with the inner shell 80.

The turning suppressing portion 86 also prevents the inner shell 80 of the engaging convex portion 85 and its peripheral portion from being deformed by increasing the rigidity of the inner shell 80 by providing the turning suppressing portion 86. It may be provided intentionally.

Specifically, for example, as in the example shown in the figure, a wall-shaped protrusion protruding toward the front surface of the outer shell 90 is provided at a peripheral position of the engaging convex portion 85 on the rear surface of the inner shell 80. Alternatively, the thickness of the inner shell 80 at the peripheral portion of the engaging convex portion 85 may be increased, or a reinforcing member may be attached at the peripheral position of the engaging convex portion 85.

In order to effectively suppress the rotation of the engaging convex portion 85 regardless of the direction in which the external force is applied to the inner shell 80, the rotation suppressing portion 86 is provided as a wall-shaped protrusion. The wall-shaped protrusion as the rotation suppressing portion 86 is preferably provided as a square-shaped (specifically, square-shaped in the rear view) surrounding the engaging convex portion 85, and is provided as an inner shell. When the 80 is thickened to form the rotation suppressing portion 86, the range of the quadrangular shape (specifically, the quadrangular shape in the rear view / front view) including the position where the engaging convex portion 85 is formed is thickened. It is preferable, and when a reinforcing member is attached as the turning suppressing portion 86, the reinforcing member as the turning suppressing portion 86 has a square shape surrounding the engaging convex portion 85 (specifically, a square shape in the rear view). It is preferable to be attached to.

However, the wall-shaped protrusion as the turn suppression portion 86 does not have to be formed as a completely square convex portion without interruption on all sides, that is, even if it is formed as a partially interrupted convex portion. good. Further, the range in which the inner shell 80 is thickened as the turning suppressing portion 86 does not have to be thickened without leakage over the entire surface of the square shape, that is, a portion that is not thickened may be included. Further, the reinforcing member as the turning suppressing portion 86 does not have to be attached so as to form a perfect square shape without interruption on all sides, that is, it may be attached intermittently.

As described above, the engaging convex portion 85 is, in particular, the inner shell 80 around the engaging convex portion 85 is rolled / turned along the elastic deformation direction (in the figure, along the paper surface of FIG. 29). It is easy to disengage from the engaging recess 93 when an external force such as being rolled up / turned over is applied to rotate the engaging recess 93. Therefore, in order to reduce or suppress the rotation of the engaging convex portion 85 along the elastic deformation direction, in the elastic deformation direction of the engaging convex portion 85 in the peripheral portion of the engaging convex portion 85 of the inner shell 80. It is effective to reduce or suppress the displacement and deformation along the line.

Therefore, when the turning suppressing portion 86 is provided as a wall-shaped protrusion, the rotation suppressing portion 86 is formed and provided as a wall-shaped protrusion along the elastic deformation direction of the engaging convex portion 85, or the inner shell 80 is provided in the elastic deformation direction. It is preferable that the outer shell 90 is formed and provided so as to be able to come into contact with the front surface of the outer shell 90 when it is to be rolled / turned along.

In the example shown in the figure, of the rotation suppressing portions 86 provided for the engaging convex portions 85 at both left and right ends as wall-shaped protrusions, the elastic deformation direction (that is, up and down) of the engaging convex portions 85 at both left and right ends. The wall-shaped protrusion 86a provided along the direction (that is, the left-right direction) orthogonal to the direction) comes into contact with the front surface of the outer shell 90 when the inner shell 80 is about to be rolled up along the elastic deformation direction. As a result, the rotation of the engaging convex portion 85 is suppressed, and the inner shell 80 of the wall-shaped protrusion 86b provided along the elastic deformation direction (that is, the vertical direction) of the engaging convex portions 85 at both left and right ends is elastic. When it is about to be rolled up along the deformation direction, the rigidity of the inner shell 80 is strengthened, and the rotation of the engaging convex portion 85 is suppressed by contacting the front surface of the outer shell 90.

In the example shown in the figure, of the rotation suppressing portion 86 provided for the engaging convex portion 85 in the middle as a wall-shaped protrusion, the elastic deformation direction of the engaging convex portion 85 in the middle (that is, left and right). The wall-shaped protrusion 86c provided along the direction) exerts rigidity enhancement of the inner shell 80 when the inner shell 80 is about to be turned over along the elastic deformation direction, and is in contact with the front surface of the outer shell 90. The turning of the engaging convex portion 85 is suppressed by, and a wall-shaped protrusion provided along a direction (that is, a vertical direction) orthogonal to the elastic deformation direction (that is, the left-right direction) of the engaging convex portion 85 in the middle. The portion 86d suppresses the rotation of the engaging convex portion 85 by contacting the front surface of the outer shell 90 when the inner shell 80 is about to be turned over along the elastic deformation direction.

It is also preferable that the turning suppressing portion 86 is provided on a line connecting a portion where an external force is applied to which the inner shell 80 is rolled / turned and a position where the engaging convex portion 85 and the engaging concave portion 93 are engaged. I can say. For example, in the example shown in the figure, when an external force to be rolled up from the lower end of the inner shell 80 is applied below the engagement position between the engaging convex portions 85 and the engaging concave portions 93 at both left and right ends, both left and right ends The wall-shaped protrusion 86a provided above the engaging convex portion 85 and the engaging concave portion 93 corresponds to this. When the inner shell 80 is to be rolled / turned by providing a wall-shaped protrusion 86a on the line connecting the point of action of the force of rolling / turning the inner shell 80 and the engaging position of the inner shell 80. The wall-shaped protrusion 86d comes into contact with the front surface of the outer shell 90 to suppress the rotation of the engaging convex portion 85, effectively preventing the engaging convex portion 85 from coming off the engaging concave portion 93 and coming off. To.

When the inner shell 80 is thickened to form the turning suppressing portion 86, it is preferable that the inner shell 80 is thickened in a band shape along the elastic deformation direction of the engaging convex portion 85.

When the reinforcing member is attached as the turn suppressing portion 86, it is preferable that the reinforcing member is attached along the elastic deformation direction of the engaging convex portion 85.

It should be noted that any one of these may be used for the formation of the wall-shaped protrusion, the increase in the thickness of the member, and the attachment of the reinforcing member, which are mentioned as examples of the mode of the turning suppressing portion 86. Alternatively, a plurality of these may be used in combination.

Further, in the example shown in the figure, the engaging convex portion 85 is provided on the inner shell 80 side, the engaging concave portion 93 is provided on the outer shell 90 side, and the turning suppressing portion 86 is provided only on the inner shell 80 side. Although it is provided, the arrangement of the engaging convex portion 85, the engaging concave portion 93, and the turning suppressing portion 86 is not limited to the example shown in the figure. In addition, as in the example shown in the figure, the arrangement is not limited so that the turning suppressing portion 86 is provided only on the side where the engaging convex portion 85 is provided.

Specifically, for example, the engaging convex portion 85 is provided on the inner shell 80, the engaging concave portion 93 is provided on the outer shell 90, and the turning suppressing portion (86) is provided on the outer shell 90. It may be provided in. The mode of the rotation suppressing portion (86) provided in the outer shell 90 in order to reduce / suppress the rotation of the engaging convex portion 85 with respect to the engaging concave portion 93 due to the inner shell 80 being rolled / turned is as an inner. When the shell 80 is about to be displaced or deformed, the rotation suppressing portion (86) comes into contact with the rear surface of the inner shell 80 to prevent the inner shell 80 from being displaced or deformed.

Further, the engaging convex portion (85) is provided in the outer shell 90, the engaging concave portion (93) is provided in the inner shell 80, and the turning suppressing portion (86) is provided between the outer shell 90 and the inner shell 80. It may be provided in at least one of them. Also in this case, when the inner shell 80 is rolled / turned, the engaging concave portion (93) moves with respect to the engaging convex portion (85), whereby the engaging convex portion (93) with respect to the engaging concave portion (93). 85) will turn around. Therefore, the inner shell 80 is provided with the turning suppressing portion 86, and the outer shell 90 is provided with the turning suppressing portion (86). It should be noted that the rotation of the engaging convex portion (85) with respect to the engaging concave portion (93) due to the inner shell 80 being rolled / turned over and the engaging concave portion (93) moving with respect to the engaging convex portion (85) is reduced. As an aspect of the turning suppressing portion (86) provided on the outer shell 90 for suppressing, the turning suppressing portion (86) is placed on the rear surface of the inner shell 80 when the inner shell 80 is about to be displaced or deformed. Examples thereof include those that prevent the inner shell 80 from being displaced or deformed by contact with the inner shell 80.

Further, the engaging convex portion (85) and the engaging concave portion (93) are provided on the outer shell 90, and the engaging convex portion (85) and the engaging concave portion (93) are provided on the inner shell 80 before turning. The restraining portion 86 may be provided on at least one of the outer shell 90 and the inner shell 80.

The engaging convex portion 85 of the inner shell 80 does not easily disengage from the engaging concave portion 93 of the outer shell 90, but it disengages when pulled by an appropriate force.

When the engaging convex portion 85 that is inserted into the engaging concave portion 93 and is engaged is pulled out, the pair of hooking portions 85b, 85b of the engaging convex portion 85 form an opening of the engaging concave portion 93. A pair of joint support portions 85a, 85a, hook portions 85b, 85b, and inclined portions 85c, 85c that face each other while sliding with respect to the inner edges of the pair of claw portions 93b, 93b. By elastically deforming as the engaging convex portion 85 in the opposite directions (that is, the elastic deformation direction), the hooking portion 85b gets over the claw portion 93b and is pulled out from the engaging concave portion 93 together with the inclined portion 85c.

The engaging convex portion 85, the engaging concave portion 93, and the rotation suppressing portion 86 ensure that the coupling force between the inner shell 80 and the outer shell 90 is appropriately secured, and then the outer shell is required for parts replacement or maintenance. The inner shell 80 can be removed from the 90, and it is possible to avoid the problem that the parts are damaged at the time of removal and the replacement or repair with a substitute is required. That is, the engagement / connection that is removable and does not easily come off is realized.

According to the engaging structure of the chair parts and the chair configured as described above, the engaging convex portion 85 of the inner shell 80 is elastically deformed to engage with the engaging concave portion 93 of the outer shell 90. Therefore, it can be configured as a detachable structure, and a turning suppressing portion 86 for reducing or suppressing the turning of the engaging convex portion 85 in a state of being engaged with the engaging concave portion 93 is provided. Therefore, the displacement or deformation of the engaging convex portion 85 in the state of being engaged with the engaging concave portion 93 is inappropriate for the engagement between the engaging convex portion 85 and the engaging concave portion 93. Displacement and deformation of the portion 85 can be suppressed. Therefore, it is possible to prevent the engaging convex portion 85 from being displaced or deformed and the engagement with the engaging concave portion 93 from being unexpectedly disengaged, and the usefulness and reliability of the engaging structure can be prevented. It is possible to improve the performance, and it is possible to improve the safety of the chair and the comfort of use by extending the backrest to which the engagement structure is applied.

Although the above-described embodiment regarding the engagement structure of the chair parts is an example of a preferred embodiment of the present invention, the embodiment of the present invention is not limited to the above-mentioned one, and the present invention is not limited to the above-described embodiment. The present invention can be modified in various ways without departing from the gist of the above.

For example, in the above-described embodiment, an example of the embodiment of the engagement structure of the chair parts has been described as an example when it is applied to the assembly of the backrest 6 of the chair whose overall structure is shown in FIG. The backrest and chair to which the above-mentioned points of the engagement structure can be applied are not limited to the backrest 6 and the chair shown in the figure as an embodiment, and further, the object of application of the above-mentioned points of the engagement structure is. It is not limited to the backrest (specifically, the relationship / connection between the inner shell 80 and the outer shell 90), but the backrest (specifically, the inner shell 80 and the outer shell 90 constituting the backrest). The above-mentioned points of the engagement structure can be applied to the engagement, attachment, and fitting of various parts and members other than the above. Furthermore, the application of the main points of the above-mentioned engagement structure is not limited to the chair, and the above-mentioned engagement structure is applied to the engagement, attachment, and fitting of various parts and members constituting various furniture. The points of can be applied.

Based on the above, the main points of the engagement structure of the chair parts described above are summarized as follows. First, the outer shell 90 is the first component, the inner shell 80 is the second component, the engaging concave portion of the outer shell 90 is a concave portion, the engaging convex portion 85 of the inner shell 80 is a convex portion, and the rotation suppression of the inner shell 80 is suppressed. Each of the parts 86 is generalized as a turning suppression part. The "first part" and "second part" mentioned above include not only those that are positioned as parts in the overall configuration of the chair and those that correspond to parts in relation to the parts of the other party, but also the entire chair. It also includes those that can be positioned as members in the configuration and those that can correspond to members in relation to the other party's parts / members.

The main point of the engagement structure of the above-mentioned chair parts is the engagement structure between the first part and the second part, the first part is provided with a recess, and the second part is attached to and detached from the recess. A convex portion that is elastically deformed and engaged with each other is provided, and the convex portion is rotated with respect to the concave portion in a state where the convex portion and the concave portion are engaged with at least one of the first component and the second component. It is organized that a turning suppression unit is provided to reduce or suppress the above. In the above configuration, it is conceivable that the first part and the second part are made of resin, and in particular, the convex portion of the second part is considered to be made of resin.

(Mounting structure of lumbar support)
The backrest 6 is arranged on the front side of a pair of left and right extruded members 100L, 100R that are attached so as to be relatively movable with respect to the outer shell 90, and a pair of left and right extruded members 100L, 100R, and supports the waist of the seated person. It has a lumbar supporter 81 and a connecting member 82 provided so as to be interposed between the inner shell 80 and the lumbar supporter 81 to support the lumbar supporter 81 (FIG. 24).

The pair of left and right extruded members 100L and 100R (that is, the left extruded member 100L and the right extruded member 100R) can slide and move along the left-right direction between the center-side position P1 and the left-right side end-side position P2, respectively. It is configured as a mechanism.

The outer shell 90 constitutes an extrusion member support that supports the back of the seated person and movably supports a pair of left and right extrusion members 100L and 100R (in other words, functions as a support for the extrusion member).

The inner shell 80 constitutes a lumbar supporter holder that holds the lumbar supporter 81 (in other words, functions as a lumbar supporter holder).

The lumbar supporter 81 is formed of resin in a roughly plate-like shape, and is held by the inner shell 80 via a connecting member 82.

The lumbar supporter 81 is configured so that almost the entire region, that is, the directly extruded portion and the surrounding portion can move in the front-rear direction by being extruded from the rear by the extrusion members 100L and 100R that can slide and move in the left-right direction. Will be done.

The connecting member 82 is interposed between the inner shell 80 and the lumbar supporter 81 to connect the lumbar supporter 81 so as to support the inner shell 80 so that the lumbar supporter 81 can move back and forth.

In the example shown in the figure, a total of four connecting members 82 are provided between the inner shell 80 and the lumbar supporter 81 on each of the upper end side and the lower end side of the lumbar supporter 81.

In the example shown in the figure, the inner shell 80, the lumbar supporter 81, and the connecting member 82 are integrally formed of resin.

The pair of left and right extruded members 100L and 100R are attached to the outer shell 90, which is a support supporting the pair of left and right extruded members 100L and 100R, so as to be slidable in the left-right direction.

The pair of left and right extrusion members 100L and 100R directly press the lumbar supporter 81 provided on the front side of the pair of left and right extrusion members 100L and 100R from the rear. As a result, a lumbar support portion that can push out and support the lumbar portion of the seated person is configured mainly by the pair of left and right extruded members 100L and 100R and the lumbar supporter 81.

The degree of lumbar support by the lumbar support portion, that is, the degree of pushing the seated person against the lumbar region (in other words, pressing against the lumbar region of the seated person) can be changed in the lateral direction of the pair of left and right extruded members 100L and 100R. It can be adjusted arbitrarily.

As a structure related to the lumbar support portion, the outer shell 90 has a portion that is bent forward in a side view (that is, a dogleg shape), and is separated in the vertical direction in the front view and the rear view along the left and right directions. A pair of upper and lower (that is, two) slits 91U and 91L (that is, an upper slit 91U and a lower slit 91L) provided in parallel with each other are formed.

The outer shell 90 and the pair of left and right extrusion members 100L and 100R are guided by a pair of upper and lower slits 91U and 91L formed in the outer shell 90, and the pair of left and right extrusion members 100L and 100R are independent of each other in the left-right direction. It is configured to be able to move along.

The pair of left and right extrusion members 100L and 100R engage with the pair of upper and lower slits 91U and 91L, and are attached so as to straddle the strip-shaped portion 94 between the slits 91U and 91L.

The inner shell 80 is formed with a substantially rectangular opening 84 at a position corresponding to the lumbar region of the seated person as a structure related to the lumbar support portion.

The opening 84 has an opening length in the left-right direction of dimensions in which a pair of left and right extruded members 100L and 100R, each of which is located at positions P2 and P2 near the left and right sides, can be included in the opening 84 in front view / rear view. A pair of left and right extruded members 100L and 100R, each of which moves between the center-side position P1 and the left-right side end-side position P2, can always be included in the opening 84 regardless of the position. It is formed as having an opening height in the vertical direction of the dimension.

Then, the lumbar supporter 81 is arranged in the opening 84 via the connecting member 82. As a result, the lumbar supporter 81 on the inner shell 80 side is arranged at a portion that can come into contact with the pair of left and right extruded members 100L and 100R attached to the outer shell 90 side in the front-rear direction.

The attachment structure of the chair parts of the present embodiment is a structure in which the extrusion members 100L and 100R are attached to the outer shell 90, and the outer shell 90 has a band-shaped portion 94 sandwiched between the pair of slits 91U and 91L. The extrusion members 100L and 100R are composed of an operation unit 110 arranged on the rear side of the outer shell 90 and an extrusion unit 120 arranged on the front side of the outer shell 90, and the operation unit 110 and the operation unit 110 A pair of connecting portions 113U and 113L for connecting to the extruded portion 120, and each of the pair of connecting portions 113U and 113L of the operating portion 110 projects toward the extruded portion 120 and penetrates the slits 91U and 91L. It has a moving portion 114 and a vertical fitting portion 116 that extends from the sliding portion 114 with a horizontal fitting portion 115 interposed therebetween and is larger than the width of the slits 91U and 91L, and faces each other in the longitudinal direction of the slits 91U and 91L. The pair of edge portions 91a and the edge portion 94a forming the slit 91U are displaced by a step difference, and the pair of edge portions 91b and the edge portion 94b forming the slit 91L are displaced by a step difference. The strip-shaped portion 94 is bent so that the horizontal fitting portion 115 and the vertical fitting portion 116 can pass between the gaps and between the steps of the edge portions 91b and 94b, respectively.

Further, the method of attaching the parts of the chair of the present embodiment is a method of attaching the extruded members 100L and 100R to the outer shell 90, and the outer shell 90 has a band-shaped portion 94 sandwiched between the pair of slits 91U and 91L. The extrusion members 100L and 100R are composed of an operation unit 110 arranged on the rear side of the outer shell 90 and an extrusion unit 120 arranged on the front side of the outer shell 90, and the operation unit 110 and the operation unit 110 A pair of connecting portions 113U and 113L for connecting to the extruded portion 120, and each of the pair of connecting portions 113U and 113L of the operating portion 110 projects toward the extruded portion 120 and penetrates the slits 91U and 91L. It has a moving portion 114 and a vertical fitting portion 116 that extends from the sliding portion 114 with a horizontal fitting portion 115 interposed therebetween and is larger than the width of the slits 91U and 91L, and is slit by bending the strip-shaped portion 94. The pair of edge portions 91a and the edge portion 94a forming the slit 91U facing each other in the longitudinal direction of the 91U and 91L are staggered, and the pair of edge portions 91b and the edge portion 94b forming the slit 91L are staggered. The horizontal fitting portion 115 and the vertical fitting portion 116 are passed between the steps of the edge portions 91a and 94a and between the steps of the edge portions 91b and 94b, respectively.

The left extrusion member 100L and the right extrusion member 100R are resin members, and function as sliding along the slits 91U and 91L along the left-right direction and pressing the lumbar supporter 81 from the rear.

The left and right extrusion members 100L and 100R each have an operation unit 110 located on the rear side of the outer shell 90 and an extrusion unit 120 located on the front side of the outer shell 90 (FIG. 30).

The operation unit 110 includes a handle portion 111 that protrudes backward along the vertical direction, a contact portion 112 that extends from the front end of the handle portion 111 in both left and right directions, and upper and lower parts that are provided on the front surface of the contact portion 112. It has a pair of connecting portions 113U and 113L (FIG. 31).

The handle portion 111, the contact portion 112, and the pair of upper and lower connecting portions 113U and 113L are integrally formed of resin.

The contact portion 112 is formed in a substantially D shape in rear view / front view, and is arranged along the rear surface of the outer shell 90.

The handle portion 111 projects rearward from the rear surface of the contact portion 112, and the left and right plate surfaces are formed in a substantially semi-elliptical shape substantially along the vertical direction.

The operation unit 110 is configured to function as a grip unit that the seated person grips when operating the left and right extruded members 100L and 100R. The seated person can arbitrarily change the position of the extrusion unit 120 in the left-right direction by grasping and sliding the operation unit 110 (specifically, the handle unit 111).

The pair of upper and lower connecting portions 113U and 113L (that is, the upper connecting portion 113U and the lower connecting portion 113L) have a structure for connecting the operating portion 110 and the extrusion portion 120, and are on the front side of the contact portion 112. In addition, as a pair of upper and lower parts that are separated from each other in the vertical direction, they are provided in a manner of projecting forward (that is, toward the outer shell 90 and the extruded portion 120).

The pair of upper and lower connecting portions 113U and 113L have a sliding portion 114 connected to the front surface of the contact portion 112, a horizontal fitting portion 115 connected to the front end of the sliding portion 114, and the horizontal fitting portion 115, respectively. It has a pair of left and right vertical fitting portions 116 and 116 that are connected to the left and right ends of the above. However, the shapes of the connecting portions 113U and 113L are not limited to the examples shown in the figure, and may have various forms.

The sliding portion 114 projects forward from the front surface of the contact portion 112, and the upper and lower plate surfaces are formed in a plate shape along the horizontal direction.

The sliding portions 114 of the pair of upper and lower connecting portions 113U and 113L are vertically separated from the pair of upper and lower sliding portions 114 and 114 in the vertical direction. It is adjusted to be the same as the degree / dimension of the separation in the direction, and is formed so as to be arranged at a position penetrating each of the pair of upper and lower slits 91U and 91L.

The lateral fitting portion 115 extends from the front end of the sliding portion 114 along the left-right direction, and the upper and lower plate surfaces are formed in a plate shape along the horizontal direction. The code of the horizontal fitting portion of the upper connecting portion 113U is 115u, and the code of the horizontal fitting portion of the lower connecting portion 113L is 115l.

The pair of left and right vertical fitting portions 116u and 116u of the upper connecting portion 113U project upward from the left and right ends of the upper surface of the horizontal fitting portion 115u while being separated from each other, and the left and right plate surfaces are in the vertical direction. It is provided as a pair of left and right protruding pieces along the line.

The pair of left and right vertical fitting portions 116l and 116l of the lower connecting portion 113L project downward from the left and right ends of the lower surface of the horizontal fitting portion 115l while being separated from each other downward, and the left and right plate surfaces are vertical. It is provided as a pair of left and right protruding pieces along the direction.

The extruded portion 120 has a pair of upper and lower fitting recesses 121U and 121L that open backward, and a pair of upper and lower locking claws 126U and 126L that project backward (FIG. 32).

The extruded portion 120 is formed in a substantially rectangular shape in front view / back view, and is arranged along the front surface of the outer shell 90.

The pair of upper and lower fitting recesses 121U and 121L (that is, the upper fitting recess 121U and the lower fitting recess 121L) have a structure for connecting the operation portion 110 and the extrusion portion 120, and are of the extrusion portion 120. It is formed on the rear surface side in a manner of opening backward (that is, toward the outer shell 90 and the operation unit 110) as a pair of upper and lower parts that are separated from each other in the vertical direction.

The upper fitting recess 121U is formed from the lateral recess 122u formed along the left-right direction and into which the lateral fitting portion 115u of the upper connecting portion 113U of the operation portion 110 enters, and from each of the left and right ends of the lateral recess 122u. It has a pair of left and right vertical recesses 123u and 123u that are formed so as to face each other while being separated from each other upward and into which a pair of left and right vertical fitting portions 116u and 116u of the upper connecting portion 113U of the operating portion 110 enter.

The lower fitting recess 121L is formed along the left-right direction, and the lateral recess 122l into which the lateral fitting portion 115l of the lower connecting portion 113L of the operation portion 110 enters, and the left and right ends of the lateral recess 122l. It has a pair of left and right vertical recesses 123l and 123l that are formed so as to face each other while being separated from each other downward and into which a pair of left and right vertical fitting portions 116l and 116l of the lower connecting portion 113L of the operation unit 110 are inserted. ..

The pair of upper and lower locking claws 126U and 126L (that is, the upper locking claw 126U and the lower locking claw 126L) have a structure for maintaining the connected state between the operation unit 110 and the extrusion unit 120, and are extruded. It is formed on the rear surface side of the portion 120 in a manner of projecting backward (that is, toward the outer shell 90 and the operation portion 110) as a pair of upper and lower parts that are separated from each other in the vertical direction.

The upper locking claw 126U is provided at a position adjacent to the upper side of the upper lateral recess 122u in a manner of projecting backward.

The upper locking claw 126U has a claw portion 126a projecting downward at the rear end.

The lower locking claw 126L is provided at a position adjacent to the lower side of the lower lateral recess 122l so as to project backward.

The lower locking claw 126L has a claw portion 126b protruding upward at the rear end.

The operation unit 110 arranged on the rear side of the outer shell 90 and the extrusion unit 120 arranged on the front side of the outer shell 90 are a pair of upper and lower connecting portions 113U and 113L of the operation portion 110, respectively. 114 penetrates the pair of upper and lower slits 91U and 91L formed in the outer shell 90, respectively (in other words, they are located in the pair of upper and lower slits 91U and 91L so as to straddle the front side and the rear side of the outer shell 90. ), The horizontal fitting portions 115 and the pair of left and right vertical fitting portions 116, 116 of the pair of upper and lower connecting portions 113U, 113L of the operating portion 110 are connected to the pair of upper and lower fitting recesses 121U, 121L of the extrusion portion 120, respectively. It is combined in a fitted state and attached to the outer shell 90.

When the horizontal fitting portions 115u of the upper connecting portion 113U and the pair of left and right vertical fitting portions 116u and 116u are fitted into the horizontal recesses 122u of the upper fitting recess 121U and the pair of left and right vertical recesses 123u and 123u, The locking claw 126U on the upper side of the extrusion portion 120 (particularly, the claw portion 126a protruding downward) is locked to the locking recess 117u formed at the rear end portion on the upper surface side of the lateral fitting portion 115u on the upper side of the operating portion 110. Then, the mating state of the upper connecting portion 113U and the upper fitting recess 121U is maintained (FIG. 32).

Further, the horizontal fitting portion 115l of the lower connecting portion 113L and the pair of left and right vertical fitting portions 116l and 116l become the horizontal recess 122l of the lower fitting recess 121L and the pair of left and right vertical recesses 123l and 123l. When fitted, the locking claw 126L on the lower side of the extrusion portion 120 (particularly, the claw portion 126b protruding upward) is formed at the lower rear end portion of the lateral fitting portion 115l on the lower side of the operation portion 110. It is locked to the stop recess 117l, and the fitting state of the lower connecting portion 113L and the lower fitting recess 121L is maintained (FIG. 32).

As a result, the operation unit 110 and the extrusion unit 120 are combined and connected, and the state of being attached to the outer shell 90 is maintained. Therefore, according to the above configuration, the operating section 110 and the extrusion section 120 are combined and attached without the use of additional other members such as screws.

In the example shown in the figure, a pair of upper and lower locking recesses 117u and 117l are both provided in the operation unit 110, and a pair of upper and lower locking claws 126U and 126L are both provided in the extrusion unit 120. At least one of the structures corresponding to the pair of upper and lower locking recesses 117u and 117l is provided in the extrusion portion 120, and at least one of the structures corresponding to the pair of upper and lower locking claws 126U and 126L is the operation portion 110. It may be provided in.

In a state where the operation unit 110 and the extrusion unit 120 are combined and connected and attached to the outer shell 90, the sliding portion 114 of the upper connecting portion 113U and the sliding portion 114 of the lower connecting portion 113L The band-shaped portion 94 of the outer shell 90 is located between the outer shells 90 so as to be sandwiched between the operation portion 110 and the extrusion portion 120 in the front-rear direction.

Then, in a state where the operation unit 110 and the extrusion unit 120 are combined and attached to the outer shell 90, the upper and lower sliding portions 114 and 114 are guided by a pair of upper and lower slits 91U and 91L, respectively, and the strip-shaped portion 94. The left and right extrusion members 100L and 100R slide and move along the left and right directions while sandwiching the above in the front-rear direction by the operation portion 110 (specifically, the contact portion 112) and the extrusion portion 120 (FIG. 33).

Here, when the dimensions of the connecting portions 113U, 113L of the operating portion 110 (particularly, in the example shown in the figure, the pair of left and right vertical fitting portions 116, 116) are large with respect to the width of the slits 91U, 91L in the vertical direction, the vertical fitting portion 110 is vertically fitted. Each of the connecting portions 113U and 113L cannot pass through the upper and lower slits 91U and 91L, respectively.

Therefore, by bending the band-shaped portion 94 sandwiched between the pair of upper and lower slits 91U and 91L forward, the upper edge 94a of the strip-shaped portion 94 and the upper edge 91a on the outer shell 90 side forming the upper edge of the upper slit 91U. A gap Gu is created between the two, and a gap Gl is created between the lower end edge 94b of the strip-shaped portion 94 and the lower edge 91b on the outer shell 90 side that forms the lower edge of the lower slit 91L (FIG. 34). ).

A pair of edge portions 91a (upper edge 91a) and edge portion 94a (upper end edge 94a) that form the slits 91U facing each other in the longitudinal direction of the upper and lower slits 91U and 91L by bending the strip-shaped portion 94 as described above. The pair of edge portions 91b (lower edge 91b) and the edge portion 94b (lower end edge 94b) that form the slit 91L are displaced in a stepwise manner, and between the steps of the edge portions 91a and 94a and the edge portion 91b. As a gap between the steps of 94b, upper and lower gaps Gu and Gl (that is, upper gap Gu and lower gap Gl) are created.

If the upper and lower gaps Gu and Gl are created by the pair of edge portions forming the upper and lower slits 91U and 91L by bending the strip-shaped portion 94, the upper and lower connecting portions 113U and 113L of the operating portion 110 (FIG. In particular, in the example shown in (1), a pair of left and right vertical fitting portions (116, 116) can be passed through.

For example, with the strip-shaped portion 94 bent forward, the side of the upper and lower connecting portions 113U, 113L of the operating portion 110 is directed toward the strip-shaped portion 94, and the direction in which the upper and lower connecting portions 113U, 113L are lined up (that is, operation). The upper and lower connecting portions 113U and 113L are in contact with the rear surface of the strip-shaped portion 94 in a posture in which the vertical direction for the portion 110 is along the longitudinal direction of the strip-shaped portion 94 (in other words, the direction along the upper and lower slits 91U and 91L). From that posture, the direction in which the upper and lower connecting portions 113U and 113L are lined up (vertical direction for the operation unit 110) is perpendicular to the longitudinal direction of the strip-shaped portion 94 (direction along the upper and lower slits 91U and 91L). The operation unit 110 is rotated while the upper and lower connecting portions 113U and 113L are brought into contact with the rear surface of the portion 94. As a result, the pair of left and right vertical fitting portions 116 and 116 can pass through the upper and lower gaps Gu and Gl, respectively. After that, when the bending of the strip-shaped portion 94 is released, the pair of upper and lower connecting portions 113U and 113L, respectively, the sliding portions 114 and 114 penetrate the pair of upper and lower slits 91U and 91L, respectively, and the pair of left and right vertical fitting portions 116. , 116 is exposed to the front side of the outer shell 90, and the operation unit 110 engages with the outer shell 90 (in other words, the operation unit 110 is attached to the outer shell 90).

According to the above configuration, a pair of structures having a dimension larger than the width of the slits and projecting outward with respect to the space / structure between the pair of slits (the strip-shaped portion 94 in the example shown in the figure). The connecting structure / engaging structure having the above can be attached / engaged through the slit.

In the example shown in the figure, the outer shell 90 is curved so as to be convex rearward in a plan view, in other words, is curved along the direction in which a pair of upper and lower slits 91U and 91L are formed. It is formed in a shape. Therefore, gaps Gu and Gl are likely to be created by bending the band-shaped portion 94 forward. However, it is not essential that the member in which the gap is created has a curved shape, and the main member (outer shell) in which a slit is formed between the member and the elastically deformed portion corresponding to the strip-shaped portion 94 in the example shown in the figure. The pair of edge portions forming the slit due to the bending of the elastically deformed portion with respect to the main body portion of 90) are displaced in a stepwise manner, and the gaps Gu, Gl (that is, between the edge of the main member and the edge of the elastically deformed portion) A gap) should be created.

Further, in the above description based on the example shown in the figure, the extrusion members 100L and 100R are attached to the slits 91U and 91L formed along the left-right direction, but the direction in which the pair of slits are formed is , The direction is not limited to the left-right direction, and may be a vertical direction or a direction inclined to either direction.

Further, in the example shown in the figure, each of the pair of upper and lower connecting portions 113U and 113L of the operating portion 110 is provided with a pair of vertically fitted portions 116 and 116 that are separated from each other in the left-right direction and arranged along the left-right direction. I am trying to do it. The pair of left and right vertical fitting portions 116 and 116, respectively, are arranged in a direction orthogonal to the pair of upper and lower slits 91U and 91L after passing through the pair of upper and lower slits 91U and 91L. Therefore, the operation unit 110 may be engaged with the slits 91U, 91L by the pair of vertical fitting portions 116, 116 on the upper and lower sides arranged in the direction orthogonal to the pair of upper and lower slits 91U, 91L. It is possible to slide left and right while engaging with the slits 91U and 91L in a stable posture by the pair of left and right vertical fitting portions 116 and 116 that are separated from each other. Therefore, in the example shown in the figure, in order to extrude the lumbar supporter 81, the extrusion unit 120 is combined with the operation unit 110 to form the extrusion members 100L and 100R, but the extrusion members 100L and 100R are engaged with the slits 91U and 91L. A part corresponding to the extrusion unit 120 is not always necessary for sliding or sliding, and it is possible to use it as a configuration in which only the operation unit 110 engages with the slits 91U and 91L.

According to the mounting structure, mounting method, and chair of the chair parts configured as described above, the pair of upper and lower slits 91U and 91L are formed by elastically deforming the strip-shaped portion 94 of the outer shell 90. Since the upper and lower connecting portions 113U and 113L of the operating portion 110 (particularly in the example shown in the figure, a pair of left and right vertical fitting portions 116 and 116) are passed by shifting the operation unit 110 and the extruding unit 120. Even if the width of the slits 91U and 91L is narrower than the dimensions of the connecting portions 113U and 113L (particularly in the example shown in the figure, the pair of left and right vertical fitting portions 116 and 116), the connecting portions 113U and 113L (FIG. In particular, in the example shown in (1), a pair of left and right vertical fitting portions (116, 116) can be passed through. Therefore, it is possible to improve the usefulness and versatility of the mounting structure and mounting method.

In particular, according to the operation unit 110 and the extrusion unit 120 having the above-described configuration, since the operation unit 110 and the extrusion unit 120 are attached in combination, it is not necessary to use the screws pointed to them, so that the slit It is not necessary to increase the vertical width of 91U and 91L so that the screw can penetrate. Therefore, it is possible to reduce the thickness of the sliding portion 114 in the vertical direction within a range in which the strength of the sliding portion 114 can be secured, and the slits 91U and 91L correspond to the thinning of the sliding portion 114. It is possible to make each of them thinner (in other words, narrow the vertical width of the slits 91U and 91L). This makes it possible to prevent, for example, a situation in which a finger or clothing is caught in the product, or to improve the appearance.

Although the above-described embodiment regarding the mounting structure and mounting method of the chair parts is an example of a preferred mode for carrying out the present invention, the embodiment of the present invention is not limited to the above. The present invention can be modified in various ways without departing from the gist of the present invention.

For example, in the above-described embodiment, a pair of left and right extruded members 100L, 100R of a lumbar support portion provided on the backrest 6 of the chair whose overall structure is shown in FIG. Although the case where it is applied to the outer shell 90 is described as an example, the backrest and the chair to which the above-mentioned main points of the mounting structure and the mounting method can be applied are the backrests 6 shown in the figure as an embodiment. Furthermore, the application of the above-mentioned mounting structure and the main points of the mounting method is not limited to the mounting of the extruded member to the outer shell constituting the backrest, but constitutes the backrest. The above-mentioned main points of the mounting structure and mounting method can be applied to the mounting of various parts / members to various parts / members other than the mounting of the extruded member to the outer shell. Furthermore, the application target of the above-mentioned mounting structure and the main points of the mounting method is not limited to the chair, and the above-mentioned mounting is applied to the mounting of various parts / members constituting various furniture to various parts / members. The main points of the structure and mounting method can be applied.

Based on the above, the main points of the mounting structure and mounting method of the above-mentioned chair parts are summarized as follows. First, the outer shell 90 is the second part, the strip-shaped portion 94 of the outer shell 90 is the elastically deformed part, the extrusion member 100L / 100R is the first part, and the operation part 110 of the extrusion member 100L / 100R is the first part, the extrusion member. The extruded portion 120 of 100L / 100R is the second component, the pair of upper and lower connecting portions 113U / 113L is the pair of connecting portions, the sliding portion 114 of the connecting portions 113U / 113L is the penetrating portion, and the connecting portions 113U / 113L are vertically fitted. The portions 116u and 116l are generalized as protrusions or one-sided portions, respectively. The "first part" and "second part" mentioned above include not only those that are positioned as parts in the overall configuration of the chair and those that correspond to parts in relation to the parts of the other party, but also the entire chair. It also includes those that can be positioned as members in the configuration and those that can correspond to members in relation to the other party's parts / members.

The main point of the above-mentioned chair component mounting structure is a structure in which the first component is mounted on the second component, and the second component has an elastically deformed portion sandwiched between a pair of slits. Is composed of a first part arranged on one side of the second part and a second part arranged on the other side of the second part, and the first part is the first part. It has a pair of connecting portions that connect the and the second component, and each of the pair of connecting portions of the first component projects toward the second component and penetrates the slit, and extends from the penetrating portion. Moreover, it has a protrusion or one piece that is larger than the width of the slit, and the pair of edges that face each other in the longitudinal direction of the slit and form the slit are displaced in a stepwise manner, and the protrusion or piece is between the steps of these edges. It is arranged that the elastically deformed portion bends so that the portion can pass through.

Further, the main point of the above-mentioned method of attaching the chair parts is a method of attaching the first part to the second part, and the second part has an elastically deformed portion sandwiched between a pair of slits, and the first Is composed of a first part arranged on one side of the second part and a second part arranged on the other side of the second part, and the first part is the first part. It has a pair of connecting parts that connect the parts and the second part, and each of the pair of connecting parts of the first part projects toward the second part and penetrates the slit, and extends from the penetrating part. It has a protrusion or one part that is larger than the width of the slit, and by bending the elastically deformed part, the pair of edges that face each other in the longitudinal direction of the slit and form the slit are staggered to shift these edges. It is organized so that it passes through the bumps or one part of the step.

Further, as described above, only the component corresponding to the operation unit 110 in the above-described embodiment is used so that the vertical fitting portions 116u, 116l of the upper and lower connecting portions 113U, 113L engage with the edge portion forming the slit. You can do it.

In this case, the main point of the mounting structure of the above-mentioned chair parts is a structure in which the first part is mounted on the second part, and the second part has an elastically deformed portion sandwiched between a pair of slits. , The first component has a pair of penetrating portions penetrating each of the pair of slits and a protrusion or one portion extending from each of these penetrating portions and larger than the width of the slit, facing each other in the longitudinal direction of the slit. Then, the pair of edges forming the slit are displaced in a stepwise manner, and the elastically deformed portion bends so that the protrusion or one portion can pass between the steps of the edges, and passes between the steps of the edges. The ridges or pieces are arranged to engage the edges that form the slit after the flexure of the elastically deformed portion is released.

Further, the main point of the above-mentioned method of attaching the chair parts is a method of attaching the first part to the second part, and the second part has an elastically deformed portion sandwiched between a pair of slits, and the part has an elastic deformation portion. , A pair of penetrating portions penetrating each of the pair of slits, and a protrusion or one portion extending from each of these penetrating portions and larger than the width of the slit, and bending the elastically deformed portion in the longitudinal direction of the slit. In, the pair of edge portions that face each other and form the slit are staggered so that the protrusion or one portion passes between the steps of these edge portions.

In the above configuration, it is conceivable that the first part and the second part are made of resin, and in particular, the second part is considered to be made of resin (that is, the first part is made of resin). It doesn't have to be).

1 Leg 2 Main frame 3 Synchro frame 4 Seat 5 Back frame 6 Backrest 7 Movable elbow 80 Inner shell 81 Lumber supporter 82 Connecting member 83 Locking hole 83a Lower edge edge 84 Opening 85 Engagement convex part 85a Joint support part 85b Hook Part 85c Inclined part 86 Turning suppression part 87 Locking part 90 Outer shell 91U Upper slit 91L Lower slit 91a Upper edge 91b Lower edge 92 Locking piece 92X Bending locking piece 92Y Curved locking piece 92a Joint part 92b Locking Claw part 92c Corner part 92d Curved part 93 Engagement recess 93a Overhang part 93b Claw part 94 Band-shaped part 94a Upper end edge 94b Lower end edge 100L Left extrusion member 100R Right extrusion member 110 Operation part 111 Handle part 112 Contact part 113U Upper side Connecting part 113L Lower connecting part 114 Sliding part 115 Horizontal fitting part 115u Upper horizontal fitting part 115l Lower horizontal fitting part 116 Vertical fitting part 116u Upper vertical fitting part 116l Lower vertical Fitting portion 117u Upper locking recess 117l Lower locking recess 120 Extruding portion 121U Upper fitting recess 121L Lower fitting recess 122u Upper lateral recess 122l Lower lateral recess 123u Upper longitudinal Recessed 123l Lower vertical recess 126U Upper locking claw 126L Lower locking claw 126a Claw protruding downward 126b Claw protruding upward P1 Center position P2 Left right edge position Gu Upper gap Gl Lower gap

Claims (6)

It is an engaging structure between the first part and the second part, and the first part is provided with a concave portion, and the second part has a convex portion that is elastically deformed and engaged with the concave portion. Provided to reduce or suppress the rotation of the convex portion with respect to the concave portion in a state where the convex portion and the concave portion are engaged with at least one of the first component and the second component. A turn suppression unit is provided ,
The convex portion is connected to a pair of joint support portions that project apart from the second component, a pair of hook portions that are connected to the pair of joint support portions, and a pair of hook portions. It has a pair of inclined portions, and the hook portion is arranged so as to be wider and inclined toward the inclined portion than the joint support portion and the inclined portion is narrowed toward the tip, and has a house shape in a cross-sectional view. It is provided as a shape of
The recess is provided as having a claw portion on which the hook portion is hooked.
The engagement structure of the chair parts is characterized by that. The engagement structure of a chair component according to claim 1, wherein the turning suppressing portion is provided so as to reduce or suppress at least turning of the convex portion along a direction of elastic deformation. The engagement structure of a chair component according to claim 1, wherein the turn suppressing portion is provided as a wall-shaped protrusion. The turning suppressing portion is provided on a line connecting a position where a force for winding the first component or the second component is applied and a position where the convex portion and the concave portion engage. The engaging structure of the chair parts according to claim 1. The engagement structure of a chair component according to claim 1, wherein a plurality of the convex portions are provided on the second component, and the elastic deformation direction of each of the convex portions is different between the adjacent convex portions. A chair comprising a backrest to which the engagement structure according to any one of claims 1 to 5 is applied and the inner shell is attached to the outer shell.

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