JP2009207770A - Mounting structure of cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the mounting structure of a cover and reduce time and labor spent on the work of assembling the cover onto a support member. <P>SOLUTION: For mounting a cover member to the support member 2 supporting the seat body 5 of a chair, adopted is the mounting structure equipped with a latched portion 211 provided on the sidewall 21 of the support member 2, a latching portion 314 provided on the sidewall 31 confronting on the outside surface of the sidewall 211 of the support member 21 in the cover member 3 and latching the cover member 3 onto the support member 2 by engaging with the latched portion 211, and a retaining portion 51 butting against or approaching the outside surface of the sidewall 31 of the cover member 3 when provided in the seat body 5 to keep the seat body 5 arranged on the support member 2. The retaining portion 51 prevents the latching portion 314 from disengaging from the latched portion 211 by outward displacement of the sidewall 31 of the cover member 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure for mounting a cover that covers a support base, a back support rod and the like in a chair.

  Office chairs used in office spaces generally include legs, a support base coupled to the legs, a back support pivotally attached to the support base, and a seat placed so as to straddle the support base and the back support base. The backrest supported by the back support is the main component.

Such a support base or back support rod of a chair is usually a metal casting or a sheet metal molded product, and is often equipped with a resin decorative cover covering the same (for example, refer to the following patent document). .
JP 2003-189963 A

  The cover must be securely assembled to the support base and / or the back support rod so that it does not fall off during use of the chair. If the cover is to be assembled securely, the mounting structure becomes complicated. The complexity of the mounting structure leads to problems such as an increase in member manufacturing cost due to the complexity of the shape of a member such as a cover, and an increase in labor for assembling the cover during product assembly.

  The present invention made in view of the above is intended to simplify the cover mounting structure and reduce the labor of the cover assembly work.

  In this invention, it is a structure which attaches a cover member to the supporting member which supports the seat of a chair, Comprising: The latching part provided in the side wall of the said supporting member, and the outer surface of the side wall of the said supporting member in the said cover member Provided on the side wall facing the door and engaging with the hooked portion to hook the cover member on the support member, and provided on the seat body, when the seat body is disposed on the support member A retaining member that abuts or is close to the outer surface of the side wall of the cover member, and that restrains the side wall from being displaced outwardly to prevent the hooking portion from being detached from the hooked portion. The mounting structure was configured. Thereby, even if the engagement structure of the latching portion and the latched portion is simple, it is possible to effectively prevent the cover member from falling off from the support member. And the labor of the assembly | attachment work to the supporting member of a cover member is also reduced.

  If the retaining part is fitted to a shaft body that is supported by the support member and protrudes outward, the retaining part that is a means for preventing the cover member from falling off is a means for assembling the seat body to the shaft body, or a shaft It also serves as a means for covering the body. That is, it is not necessary to separately use a member for assembling the seat body to the shaft body or a member for covering the shaft body, and an increase in the number of extra members can be avoided. The shaft body referred to here is, for example, a hinge shaft that pivotally supports the support member and another member so as to be relatively rotatable, an operation shaft for operating various mechanisms mounted in the support member, and the like.

  A second cover member is disposed above the support member, and an engaged portion provided on a side wall of the cover member, provided on the second cover member, and engaged with the engaged portion. If the structure further includes an engaging portion that prevents the side wall of the cover member from being displaced outwardly to prevent the hooking portion from being detached from the hooked portion, in addition to the retaining portion of the seat body The second cover member can also prevent the cover member from falling off the support member. This contributes to further simplification of the engagement structure between the latching portion and the latched portion.

  A second cover member is disposed above the support member. The second cover member is disposed on a side wall of the cover member and is substantially in contact with or close to about half of the outer periphery of the shaft body supported by the support member and protruding outward. A lower shaft hole having a semicircular rim, and a side wall that is substantially flush with the side wall of the cover member in the second cover member, and is in contact with or close to the remaining half of the outer periphery of the shaft body And an upper shaft hole portion having a substantially semicircular rim, and the shaft body is inserted into a shaft hole formed by the lower shaft hole portion and the upper shaft hole portion. It is suitable for covering one support member by the member and the second cover member, and can be well covered around the axis.

  If a tongue piece extending toward the other is provided on one of the contact surfaces where the lower shaft hole and the upper shaft hole contact, and a concave groove into which the tongue is inserted is provided on the other Thus, it is possible to avoid a shift between the lower shaft hole portion and the upper shaft hole portion along the axial direction of the shaft body.

  A second cover member is disposed above the support member, and a mooring portion provided on the side wall of the support member or the side wall of the cover member, and provided on the cover member, outside the side wall of the support member. Inner and outer spacers that maintain a gap between the side surface and the inner side surface of the side wall of the cover member, and provided in the second cover member, engage with the anchored portion through the gap, and connect the second cover member to the support member or If the structure further includes a mooring portion moored to the cover member, it is possible to effectively prevent the second cover member from falling off the support member.

  The anchored portion is provided at the lower edge of the side wall of the support member, and the upper and lower spacers that maintain a gap between the lower edge of the side wall of the support member and the lower wall of the cover member facing the cover member. And the second cover member can be directly assembled to the support member if the anchoring portion is engaged with the anchored portion via the gap.

  ADVANTAGE OF THE INVENTION According to this invention, the attachment structure of a cover can be simplified and the effort of the assembly | attachment operation | work to the support member of a cover is reduced.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a chair to which the cover mounting structure according to this embodiment is applied. In general, the chair includes a leg 11, a support base 12 coupled to the leg 11, a back support rod 13 pivotally supported around the rotation shaft 16 at the rear end of the support base 12, and a front A seat body 14 having a portion supported by a support base 12 and a rear portion supported by a back support rod 13 and a backrest 15 attached to the back support rod 13 are provided.

  The lower part 131 and the upper part 132 of the back support rod 13 are separate members. As shown in FIG. 2, the back support rod upper portion 132 is pivotally supported on the upper end portion of the back support rod lower portion 131 so as to be rotatable around the rotation shaft 17. The backrest 15 has a lower end fixed to the back support lower part 131 and an upper end supported on the back support upper 132 via a slide mechanism (not shown) so as to be vertically slidable.

  The front portion of the seat body 14 is supported on the front portion of the support base 12 so as to be slidable back and forth via a slide shaft 19, and the rear portion of the seat body 14 is supported on the middle portion of the back support rod lower portion 131 via a back seat synchronization shaft 18. It is pivotally supported.

  In the synchro-rocking operation in which the entire back support rod 13 is tilted backward about the rotation shaft 16, the front portion of the seat body 14 is displaced rearward, and the rear portion of the seat body 14 sinks rearward and downward. In the tilting operation in which only the back support rod upper portion 132 is tilted backward about the rotation shaft 17 without moving the back support rod lower portion 131, the upper end portion of the backrest 15 slides downward relative to the back support rod upper portion 132. . At this time, the backrest 15 is bent and deformed like a side view bow, and the lumbar support between the lower end portion and the upper end portion projects forward.

  The back support rod lower portion 131 and the support base 12 of the chair are covered with cosmetic covers 3, 4, 7, and 8, respectively. Hereinafter, the mounting structure of the decorative covers 3, 4, 7, and 8 will be described.

  As shown in FIGS. 2 and 3, the back support rod lower portion 131 mainly includes the lower back frame 2 that is a support member that supports the rear portion of the seat body 14. The lower back frame 2 is a metal member that includes side walls 21 that are paired on the left and right sides, rigid connection shafts 22 and 23 that rigidly connect the side walls 21, and a reinforcing member 24.

  As shown in FIGS. 3 to 7, the side wall 21 of the lower back frame 2 has a general shape that extends rearward and upward from the lower end in a side view and bends forward and upward near the upper end. The rotation shaft 17 is inserted into the upper end portion of the side wall 21. The back support rod upper part 132 is located near the lower end between the left and right side walls 21, and the vicinity of the lower end is pivotally attached by the rotating shaft 17. The end of the rotating shaft 17 protrudes somewhat outward from the side wall 21. The protruding end portion of the rotating shaft 17 and / or the upper end portion of the side wall 21 serves as a hooked portion. The upper edge of the lower end portion of the side wall 21 is extended upward to serve as a bearing for the rotating shaft 16. The upper edge of the middle part of the side wall 21 is also extended upward, and the back seat sync shaft 18 which is a shaft body is inserted here. The end of the back seat sync shaft 18 protrudes more outward than the side wall 21. A through hole 211 serving as a hooked portion is formed in the side wall 21 below the back synchro shaft 18. In addition, the lower end edge of the side wall 21 serves as an anchored portion that engages a claw of the anchoring arm 45 described below.

  The rigid connection shafts 22 and 23 are present at the lowermost end of the side wall 21 and at positions separated rearward and upward from the back seat sync shaft 18. The lowermost rigid coupling shaft 22 is located directly below the support base 12 and is interposed between the support base 12 and the rear end of the spring 91 that generates a reaction force that opposes the backward tilting motion of the entire back support rod 13. Connect to The rear upper rigid shaft 23 is located immediately before the lower end of the upper portion 132 of the back support rod, and is interposed between the upper portion 132 of the back support rod and generates a reaction force relative to the backward tilting operation of only the upper portion 132 of the back support rod. The front end of the spring 92 to be produced is connected to this. The rear end of the spring 92 is connected to the lower end portion of the back support rod upper portion 132.

  The reinforcing member 24 is a plate body that is refracted between the side walls 21. The rear part of the reinforcing member 24 extends forward and upward along the front edge of the upper end of the side wall 21 bent forward and upward. This portion serves as a fixed portion 241 for fixing the fixed end 151 protruding backward from the lower end portion of the backrest 15. In addition, a rear end of a gas spring 93 that prohibits / allows rotation of the back support rod 13 around the axis 16 is connected to the front portion of the reinforcing member 24.

  The lower back cover 3, which is a cover member attached to the lower back frame 2, includes a side wall 31 that is paired on the left and right sides, a lower wall 32 that is connected to the lower edges of the side walls 31, and a rear edge and a lower wall 32 of the side walls 31. It is a resin molding member provided with the rear wall 33 connected with a rear edge. The side wall 31 of the lower back cover 3 shields the lower back frame 2 from the side except for the lower end thereof, the lower wall 32 shields the lower back frame 2 from below, and the rear wall 33 allows the lower back frame 2 from the rear. Shield.

  The side wall 31 of the lower back cover 3 has a general shape that extends rearward and upward from the lower end in a side view and bends forward and upward near the upper end so as to cover the side wall 21 of the lower back frame 2. The upper edge of the lower end portion of the side wall 31 is notched in a partial arc shape when viewed from the side. When the lower back cover 3 is attached to the lower back frame 2, the rotation shaft 16 is at the approximate center of the arc. Further, an edge portion 311 refracting inward along the arc-shaped edge and extending forward from the inner end is provided.

  The upper edge of the middle portion of the side wall 31 is extended upward, and a substantially semi-arc-shaped peripheral edge that is in contact with or close to the lower half of the outer periphery of the back seat sync shaft 18 is formed as a lower shaft hole portion 312. . A concave groove 313 that is recessed downward is carved on the upper end surface of the lower shaft hole portion 312. On the inner surface of the side wall 31, a protrusion 314 serving as a latching portion is provided in a projecting position below the lower shaft hole portion 312. The protrusion 314 has a substantially cross shape having a size substantially matching the inner diameter of the through-hole 211 formed in the lower frame 2 when viewed from the side.

  At the uppermost end edge of the side wall 31, a flange portion 315 protruding inward is provided. The collar portion 315 has a substantially partial cylindrical shape, and serves as a hook portion that engages with the end portion of the rotating shaft 17 protruding from the side wall 21 of the lower back frame 2 and / or the upper end portion of the side wall 21 from above.

  A plurality of ribs 316, 317, 318, and 321 are erected on the inner surface of the side wall 31 and the upward surface of the lower wall 32. The ribs 316 erected on the front and rear sides with the protrusions 314 sandwiched are in contact with the outer surface of the side wall 21 of the lower back frame 2 at the inner end surface. The rearmost rib 318 and a plurality of ribs 317 intermittently arranged between the rib 316 and the rib 317 have a substantially L shape in front view joined to the side wall 31 and the lower wall 32, and have a relatively narrow width. The inner end surfaces of the upper portions 317 a and 318 a abut against the outer surface of the side wall 21 of the lower back frame 2, and the upper end surfaces of the relatively wide lower portions 317 b and 318 b contact the lower end surface of the side wall 21 of the lower back frame 2. Touch. The rib 321 erected in the vicinity of the front edge of the lower wall 32 is in contact with the lower end surface of the side wall 21 of the lower back frame 2 at its upper end surface. The ribs 316, 317a, and 318a function as inner and outer spacers that maintain a gap between the side wall 21 of the lower back frame 2 and the side wall 31 of the lower back cover 3. The ribs 317 b, 318 b, and 321 serve as upper and lower spacers that maintain a gap between the lower edge of the side wall 21 of the lower back frame 2 and the lower wall 32 of the lower back cover 3.

  The second lower back cover 4, which is a second cover member attached to the lower back cover 3, is a thin plate-shaped resin molded member formed in a shape along the upper edge of the side wall 31 of the lower back cover 3. The second lower back cover 4 shields the lower back frame 2 from above. The vicinity of the upper end of the second lower back cover 4 is bent forward and upward. This bent portion is a portion that contacts the front surface of the fixed portion 241 of the lower back frame 2 so that a fastening tool such as a bolt or a screw that fastens the fixed end 151 of the backrest 15 to the fixed portion 241 can pass therethrough. A window 41 is opened. The width dimension of the second lower back cover 4 substantially matches the inner method of the side walls 31 of the lower back cover 3, and both side ends of the second lower lower cover 4 are the lower back cover except for the upper shaft hole portion 42 described below. 3 just inside the side wall 31.

  The part close to the back seat sync shaft 18 has a substantially partial cylindrical shape protruding upward so as not to interfere with the back seat sync shaft 18. At the side end, a side wall orthogonal to the side is partially provided, and a substantially semi-arc-shaped peripheral edge is formed on the side wall so as to contact or be close to the upper half of the outer periphery of the back seat synchro shaft 18. The upper shaft hole 42 is used. The upper shaft hole portion 42 is on the outer side of the side end of the second lower back cover 4 by the plate thickness and is substantially flush with the side wall 31 of the lower back cover 3. On the lower end surface of the upper shaft hole portion 42, a tongue piece 43 extending downward is projected. In addition, a fitting portion 44 that has a horseshoe shape opened downward in a side view and is fitted to the back seat sync shaft 18 is provided at a location that is biased inward from the tongue piece 43.

  A mooring arm 45 serving as a mooring portion protrudes from the vicinity of the side end on the downward surface of the second lower back cover 4. The mooring arm 45 has a claw that extends downward by a predetermined distance and protrudes inward at its lower end. The mooring arm 45 is inserted into a gap between the side wall 21 of the lower back frame 2 and the side wall 31 of the lower back cover 3 caused by the presence of the ribs 316, 317, and 318, more specifically, a gap between the plurality of ribs 317 arranged side by side. Then, the claw is placed on the lower edge of the side wall 21 of the lower back frame 2 through the gap between the lower edge of the side wall 21 of the lower back frame 2 and the lower wall 32 of the lower back cover 3 caused by the presence of the ribs 317, 318, 321. Engage with.

  In attaching the covers 3 and 4 to the lower back frame 2, the lower back cover 3 is first put on the lower back frame 2. As shown in FIGS. 4 to 6, the protrusion 314 on the inner side of the lower back cover 3 is inserted into the through hole 211 of the side wall 21 of the lower back frame 2 from the outside, and the collar 315 is attached to the lower back frame 2. Hook the end of the inserted rotating shaft 17 from above. At the same time, the lower half of the back synchro shaft 18 is accommodated in the lower shaft hole 312.

  Next, the second lower back cover 4 is put on. As shown in FIG. 5, the mooring arm 45 is inserted into the gap between the ribs 317 from above, and the claws are engaged with the lower edge of the side wall 21 of the lower back frame 2, and the fitting portion 44 is connected to the back seat synchronization shaft. 18 is fitted from above. Further, as shown in FIG. 7, the tongue piece 43 is inserted into the concave groove 313 on the lower back cover 3 side from above, and the upper half portion of the back seat sync shaft 18 is accommodated in the upper shaft hole portion 42. The lower shaft hole 312 and the upper shaft hole 42 constitute one shaft hole through which the back seat sync shaft 18 is inserted.

  Further, by fixing the fixed end 151 of the backrest 15 to the front side of the fixed portion 241 of the lower back frame 2, the upper end portion of the second lower lower cover 4 is interposed between the fixed portion 241 and the fixed end 151. The peripheral edge of the window 41 is sandwiched.

  Thereafter, the rear part of the seat body 14 is placed. The seat body 14 is mainly composed of a seat receiver 5 of a resin molded member on which a cushion or the like that forms a seat surface is mounted on the upper surface side. A retaining portion 51 is projected from the lower surface of the seat 5. The retaining portion 51 is fitted to the end portion of the back seat sync shaft 18 protruding outward from the side wall 31 of the lower back cover 3 through the shaft holes 312 and 42, and conceals this from the outside and the rear. As shown in FIG. 6, when the retaining portion 51 is fitted to the end portion of the back seat sync shaft 18, the inner surface of the retaining portion 51 is in contact with or close to the outer surface of the side wall 31 of the lower back cover 3. To do. As a result, it becomes difficult for the side wall 31 of the lower back cover 3 to be displaced outward through elastic deformation or the like, so that the projection 314 escapes from the through-hole 211 or the collar 315 slides down from the end of the rotating shaft 17. The risk of dripping is reduced.

  The lower back cover 3 and the second lower lower cover 4 attached to the lower back frame 2 are tilted around the rotation shaft 16 together with the lower back frame 2. Summarizing the mounting structure of the covers 3 and 4, the hooked portions 211 and 17 provided on the side wall 21 of the support member 2 and the side wall of the cover member 3 facing the outer surface of the side wall 21 of the support member 2. 31 is provided on the seat body 14 and the latching portions 314 and 315 that are engaged with the latched portions 211 and 17 and latch the cover member 3 on the support member 2. When placed on the support member 2, the cover member 3 abuts on or is close to the outer surface of the side wall 31, the side wall 31 is displaced outwardly, and the hooking portions 314 and 315 become the hooked portion 211. , 17, 21, and a retaining structure 51 that suppresses detachment from the retaining parts 51, 17, 21, so that the engaging structure between the latching parts 314, 315 and the latched parts 211, 17, 21 is simple. Also, the support member 2 of the cover member 3 It can be effectively prevented from falling off al. And the effort of the assembly | attachment work to the supporting member 2 of the cover member 3 is also reduced.

  Since the retaining portion 51 is supported by the support member 2 and is fitted to the shaft body 18 protruding outward, the retaining portion 51, which is a means for preventing the cover member 3 from falling off, attaches the seat body 14 to the shaft body. It also serves as means for assembling to 18 or means for covering the shaft body 18. That is, it is not necessary to separately use a member for assembling the seat body 14 to the shaft body 18 or a member for covering the shaft body 18, and an increase in the number of extra members can be avoided.

  The second cover member 4 is disposed above the support member 2, and is provided on the side wall 31 of the cover member 3 and is supported by the support member 2 and about half of the outer periphery of the shaft body 18 protruding outward. The lower shaft hole 312 having a substantially semi-arc-shaped peripheral edge that is in contact with or close to, and the side wall 31 of the second cover member 4 that is substantially flush with the side wall 31 of the cover member 3, An upper shaft hole portion 42 having a substantially semi-arc-shaped peripheral edge that is in contact with or close to the other half of the outer periphery, and is formed in the shaft hole formed by the lower shaft hole portion 312 and the upper shaft hole portion 42. Since the shaft body 18 is inserted, the structure is suitable for covering one support member 2 with the cover member 3 and the second cover member 4, and the shaft 18 can be covered well.

  A tongue piece 43 extending toward the other is provided on one of the contact surfaces where the lower shaft hole portion 312 and the upper shaft hole portion 42 abut, and a concave groove 313 into which the tongue piece 43 is inserted is provided on the other. The shift between the lower shaft hole portion 312 and the upper shaft hole portion 42 along the axial direction of the shaft body 18 can be avoided.

  The second cover member 4 is disposed above the support member 2, the anchored portion provided on the side wall 21 of the support member 2, the cover member 3, and the side wall 21 of the support member 2. Inner and outer spacers 316, 317a, 318a that maintain a gap between the outer side surface and the inner side surface of the side wall 31 of the cover member 3, and the second cover member 4, are engaged with the anchored portion via the gap, Since the structure further includes the mooring portion 45 for mooring the second cover member 4 to the support member 2, the second cover member 4 can be effectively prevented from falling off the support member 2.

  The anchored portion is provided at the lower edge of the side wall 21 of the support member 2, and further, the cover member 3 has a lower edge of the side wall 21 of the support member 2 and a lower wall 32 of the cover member 3 facing the lower edge. Upper and lower spacers 317b, 318b, and 321 are provided, and the mooring portion 45 is engaged with the moored portion via the gap. It can be assembled directly to the support member 2.

  As shown in FIGS. 2 and 8, the support base 12 is mainly composed of a main frame 6 that is the support member 2 that supports the front portion of the seat body 14. The main frame 6 includes an upper wall 61, a side wall 62 bent downward from both sides of the upper wall 61 and paired to the left and right, and a rear lower side along the lower edge of the side wall 62 connected to the front edges of the side walls 62. This is a metal member having a front wall 63 that is curved and elongated as an element.

  As shown in FIGS. 8 to 11, there are two front and rear openings 611 and 612 in the upper wall 61 of the main frame 6. The front opening 611 is positioned in the vicinity of the fixed position of the front end of the spring 91 that generates a reaction force relative to the backward tilting operation of the entire back support rod 13. A spring retainer, a reaction force adjusting mechanism, and the like are directly below the opening 611. Is disposed. The rear opening 612 is located immediately above the connecting end 613 that connects the legs 11.

  The side wall 62 has a general shape extending downward from the front end in a side view. The upper edge of the front end portion of the side wall 62 extends upward, and a long hole 621 expanded in the front-rear direction is formed. The long shaft 621 is inserted into the slide shaft 19 and is held slidable in the front-rear direction. In addition, immediately after the long hole 621, a through hole 622 serving as an anchored portion is formed. A block-shaped shaft support 623 is provided at the rear end of the side wall 62, and a front end of a gas spring 93 that prohibits / allows rotation of the back support rod 13 around the shaft 16 is pivotally attached. The shaft support body 623 is separated from the left and right. A notch 624 is formed on the rear surface of each shaft support 623. The rotation shaft 16 that pivotally supports the back support rod 13 is inserted through a portion that is biased forward from the rear end of the side wall 62. Further, a notch 625 serving as a hooked portion is also formed across the upper wall 61 and the side wall 62 on the front upper side of the rotation shaft 16.

  A pair of left and right through holes 631 are formed in the front wall 63.

  A mechanical cover 7 that is a cover member attached to the main frame 6 includes a side wall 71 that is paired on the left and right sides, a lower wall 72 that is connected to the lower edges of the side walls 71, a front edge of the side walls 71, and a front edge of the lower wall 72. It is a resin molding member provided with the front wall 73 connected. The side wall 71 of the mechanical cover 7 shields the lower ends of the main frame 6 and the lower back frame 2 from the side, the lower wall 72 shields the main frame 6 from below, and the front wall 73 shields the main frame 6 from the rear.

  The side wall 71 of the mechanical cover 7 has a general shape extending rearward and downward from the front end in a side view so as to cover the side wall 62 of the main frame 6. The upper edge of the front end portion of the side wall 71 extends upward and has a long hole 711 that extends in the front-rear direction. The long hole 711 is substantially overlapped with the long hole 621 of the side wall 62 of the main frame 6 in a side view, and also holds the slide shaft 19 so that it can slide back and forth. The rear end edge of the side wall 71 is formed in a partial arc shape corresponding to the upper edge shape of the lower end portion of the side wall 31 of the lower back cover 3 in side view. When the mechanical cover 7 is attached to the main frame 6, the rotation shaft 16 is at the approximate center of the arc. Incidentally, the edging portion 311 of the side wall 31 of the lower back cover 3 fits just inside this arc-shaped edge portion.

  A claw 721 is provided in the vicinity of the front edge of the lower wall 72. The claw 721 protrudes upward and the tip is bent backward. There are a pair of left and right claws 721, which engage with the rear edge of the through hole 631 formed in the front wall 63 of the main frame 6. A claw 722 is also provided near the rear edge of the lower wall 72. The claw 722 protrudes upward, and the tip is bent forward. There are a pair of left and right claws 722 that engage with the lower edge of the notch 624 formed in the shaft support 623 of the main frame 6.

  A plurality of ribs 723 and 724 are erected on the inner surface of the side wall 71. The ribs 723 and 724 joined to the side wall 71 are in contact with the outer side surface of the side wall 62 of the main frame 6 at the inner end face. In particular, the rib 724 has a substantially square pipe shape in plan view, and a through hole 725 serving as an engaged portion and an anchored portion is formed in the inner wall thereof. Further, from the vicinity of the upper edge of the rib 724, a latching claw 726 serving as a latching portion is projected inward. The latching claw 726 engages with the lower edge of the notch 625 straddling the upper wall 61 and the side wall 62 of the main frame 6. The ribs 723 and 724 serve as inner and outer spacers that maintain a gap between the side wall 62 of the main frame 6 and the side wall 71 of the mechanical cover 7.

  The second mechanical cover 8, which is a second cover member attached to the mechanical cover 7, is a thin plate-shaped resin molded member that is molded into a shape along the upper edge of the side wall 71 of the mechanical cover 7. The second mechanical cover 8 shields the main frame 6 from above. The width dimension of the second mechanical cover 8 substantially matches the inner method of the side walls 71 of the mechanical cover 7, and both side ends of the second mechanical cover 8 are located just inside the side wall 71 of the mechanical cover 7.

  From the vicinity of the side edge on the downward surface of the second mechanical cover 8, an anchoring claw 81 that serves as an engaging part and an anchoring part protrudes. The lower end of the mooring claw 81 is bent inward. The anchoring claw 81 is inserted into a gap between the side wall 62 of the main frame 6 and the side wall 71 of the mechanical cover 7 caused by the presence of the ribs 723 and 724, more specifically, into the rib 724 having a substantially square pipe shape in plan view. And it engages with the through-hole 725 in the inner wall of the rib 724 from the outside. Protruding pieces 82 exist before and after the anchoring claw 81, and these protruding pieces 82 are respectively engaged with the front and rear walls of the ribs 724 for positioning. Claws 83 that serve as mooring portions are also provided on both sides of the second mechanical cover 8 in the vicinity of the front edge. The claw 83 protrudes downward, the tip is bent sideways, and engages with the upper edge of the through hole 622 drilled in the front end portion of the side wall 62 of the main frame 6.

  In addition, the nail | claw 84 is provided also in the location biased a little back from the center area | region. The claw 84 protrudes downward, the tip is bent forward, and engages with the rear edge of the rear opening 612 in the upper wall 61 of the main frame 6.

  In attaching the covers 7 and 8 to the main frame 6, the mechanical cover 7 is first put on the main frame 6. As shown in FIGS. 9 to 11, the latching claw 726 on the inner side of the mechanical cover 7 is engaged with a notch 625 straddling the upper wall 61 and the side wall 62 of the main frame 6 from the outside, and the claw 721 of the lower wall 72 is used. , 722 are engaged with the through hole 631 of the front wall 63 of the main frame 6 and the notch 624 on the rear surface of the shaft support 623, respectively. Further, the slide shaft 19 is inserted into the long hole 621.

  Next, the second mechanical cover 8 is put on. The anchoring claw 81 is inserted into the rib 724 from above and engaged with the through hole 725 on the inner wall of the rib, the claw 83 is engaged with the through hole 622 on the side wall 62 of the main frame 6, and the claw 84 is engaged with the main frame. 6 is engaged with the opening 612 in the upper wall. The mooring claws 81 that are paired on the left and right are fixed to the second mechanical cover 8, and the distance between them is constant. These anchoring claws 81 are respectively engaged with through holes 725 provided in the left and right side walls 71 of the mechanical cover 7 to keep the distance between the left and right ribs 724 and the distance between both side walls 71 constant. In general, the engagement between the mooring claw 81 and the through hole 725 makes it difficult for the side wall 71 of the mechanical cover 7 to be displaced outward through elastic deformation or the like, and the latching claw 726 may be detached from the notch 625. To reduce.

  After that, the front part of the seat body 14 is placed. On the lower surface of the seat 5, a retaining part 52 is projected. The retaining portion 52 is fitted to the end portion of the slide shaft 19 that protrudes outward from the side wall 71 of the mechanical cover 7 through the long hole 621 and conceals this from the outside and the front. As shown in FIG. 11, when the retaining portion 52 is fitted to the end portion of the slide shaft 19, the inner surface of the retaining portion 52 is in contact with or close to the outer surface of the side wall 71 of the mechanical cover 7. As a result, it becomes more difficult for the side wall 71 of the mechanical cover 7 to be displaced outward, and the possibility that the latching claw 726 is detached from the notch 625 is further reduced.

  The mechanical cover 7 and the second mechanical cover 8 attached to the main frame 6 do not interfere with the tilt of the back support rod lower portion 131 around the rotation shaft 16. The cover 7 and the mounting structure of the cover 8 can be summarized as follows: a hooked portion 625 provided on the side wall 62 of the support member 6 and a side wall 71 facing the outer surface of the side wall 62 of the support member 6 in the cover member 7. And a latching portion 726 that engages with the latched portion 625 and latches the cover member 7 on the support member 6, and is provided on the seat body 14, and the seat body 14 is disposed on the support member 6. In this case, it is prevented from coming into contact with or close to the outer surface of the side wall 71 of the cover member 7, so that the side wall 71 is displaced outward and the hooking portion 726 is detached from the hooked portion 625. Since the mounting structure includes the retaining portion 52, even if the engagement structure between the hooking portion 726 and the hooked portion 625 is simple, the cover member 7 is effectively prevented from falling off from the support member 6. can do. And the trouble of the assembly | attachment operation | work to the support member 6 of the cover member 7 is also reduced.

  Since the retaining portion 52 is fitted to the shaft body 19 that is supported by the support member 6 and protrudes outward, the retaining portion 52 that is a means for preventing the cover member 7 from falling off causes the seat body 14 to be the shaft body. It also serves as means for assembling to 19 or means for covering the shaft body 19. That is, it is not necessary to separately use a member for assembling the seat body 14 to the shaft body 19 or a member for covering the shaft body 19, and an increase in the number of extra members can be avoided.

  The second cover member 8 is disposed above the support member 6, and the engaged portion 725 provided on the side wall 71 of the cover member 7 and the second cover member 8 are provided, An engagement portion 81 that engages with the portion 725 and prevents the side wall 71 of the cover member 7 from being displaced outwardly and the hooking portion 726 from being detached from the hooked portion 625. Because of the structure, the cover member 7 can be prevented from falling off from the support member 6 by the second cover member 8 in addition to the retaining portion 52 of the seat body 14. This contributes to further simplification of the engagement structure between the hooking portion 726 and the hooked portion 625.

  The second cover member 8 is disposed above the support member 6, the moored portions 622 and 725 provided on the side wall 62 of the support member 6, the side wall 71 of the cover member 7, and the cover member 7. Provided inside and outside spacers 723 and 724 that maintain a gap between the outer side surface of the side wall 62 of the support member 6 and the inner side surface of the side wall 71 of the cover member 7, and the second cover member 8. The structure further includes anchoring portions 83 and 81 that engage with the anchored portions 622 and 725 and anchor the second cover member 8 to the cover member 7. Dropout can be effectively prevented.

  The present invention is not limited to the embodiment described in detail above. For example, in the set of the lower back cover 3 and the second lower back cover 4, a tongue piece can be provided on the lower shaft hole portion 312 side and a concave groove for receiving the tongue piece can be provided on the upper shaft hole portion 42 side.

  Other specific configurations of each part can be variously modified without departing from the spirit of the present invention.

The side view which shows the chair to which one Embodiment of this invention is applied. The side view which shows the state which removed the cover from the chair. The disassembled perspective view which shows a back lower frame, a back lower cover, and a 2nd back lower cover. The top view which shows the state which attached the lower back cover to the back lower frame. The sectional side view which shows the state which attached the lower back cover and the 2nd back lower cover to the back lower frame. The principal part front sectional view which shows the state which attached the lower back cover and the 2nd back lower cover to the back lower frame. The figure which expanded a part of FIG. The disassembled perspective view which shows a main frame, a mechanical cover, and a 2nd mechanical cover. The top view which shows the state which attached the mechanical cover to the main frame. The sectional side view which shows the state which attached the mechanical cover and the 2nd mechanical cover to the main frame. The principal part front sectional view which shows the state which attached the mechanical cover and the 2nd mechanical cover to the main frame.

Explanation of symbols

2, 6 ... support members 211, 17, 21, 625 ... hooked portions 3, 7 ... cover members 314, 315, 726 ... hook portions 4, 8 ... second cover members 18, 19 ... shaft bodies 51, 52 ... Retaining part of seat

Claims (7)

A structure in which a cover member is attached to a support member that supports a seat of a chair,
A hooked portion provided on a side wall of the support member;
A latching portion that is provided on a side wall facing the outer side surface of the side wall of the support member in the cover member, and engages with the latched portion to latch the cover member on the support member;
When the seat is disposed on the support member, the seat is in contact with or close to the outer side surface of the side wall of the cover member, and the side wall is displaced outwardly so that the hooking portion is covered with the cover. A cover mounting structure including a retaining portion that prevents detachment from the latching portion. The cover mounting structure according to claim 1, wherein the retaining portion is fitted to a shaft body supported by the support member and protruding outward. A second cover member is disposed above the support member;
An engaged portion provided on a side wall of the cover member;
A mechanism that is provided on the second cover member, engages with the engaged portion, and inhibits the side wall of the cover member from being displaced outwardly and detaching the hooking portion from the hooked portion. The cover mounting structure according to claim 1, further comprising a joint portion. A second cover member is disposed above the support member;
A lower shaft hole provided on a side wall of the cover member and having a substantially semi-arc-shaped peripheral edge that is in contact with or close to about half of the outer periphery of the shaft body supported by the support member and protruding outward;
An upper shaft hole provided on a side wall that is substantially flush with the side wall of the cover member in the second cover member and has a substantially semi-arc-shaped peripheral edge that is in contact with or close to the remaining half of the outer periphery of the shaft body And further comprising
The cover mounting structure according to claim 1, 2, or 3, wherein the shaft body is inserted through a shaft hole formed by the lower shaft hole portion and the upper shaft hole portion. A tongue piece extending toward the other is provided on one of the contact surfaces where the lower shaft hole and the upper shaft hole contact, and a concave groove into which the tongue is inserted is provided on the other. Item 5. The cover mounting structure according to Item 4. A second cover member is disposed above the support member;
A moored portion provided on a side wall of the support member or a side wall of the cover member;
An inner and outer spacer that is provided on the cover member and maintains a gap between the outer side surface of the side wall of the support member and the inner side surface of the side wall of the cover member;
An anchoring portion provided on the second cover member, engaged with the anchored portion via the gap, and further anchoring the second cover member to the support member or the cover member. 3. The cover mounting structure according to 3, 4, or 5. The moored portion is provided at a lower edge of a side wall of the support member;
Further, the cover member is provided with an upper and lower spacer that maintains a gap between the lower edge of the side wall of the support member and the lower wall of the cover member facing the support member,
The cover mounting structure according to claim 6, wherein the anchoring portion is engaged with the anchored portion via the gap.

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