JP6282084B2 - Chair back - Google Patents

Description

  The present invention relates to a chair backrest.

  The back of the chair has a variety of structures, but when a cushion is provided, the back inner shell is generally stretched with a cushion in front of the back inner shell (back plate) that can be bent and deformed by human body pressure. It is often attached to a back outer shell arranged on the back side (for example, Patent Document 1).

Backrest of the back outer shell and functioning as an intensity members, therefore, the whole has become a rigid structure capable of supporting a load of the seated person, in the case of rocking chair, or attached to the back outer shell to the back post, back outer The shell itself is provided with a forward-facing arm and attached to the base.

JP 2010-94305 A

  As described above, the back outer shell functions as a strength member. However, since the back outer shell is generally made of resin, strength is ensured by providing a number of reinforcing ribs on the front surface. However, when a large number of ribs are formed, a dent called a sink may be formed on the outer surface (rear surface) of the rib portion after the resin is cured, which may deteriorate the aesthetics and lead to quality deterioration.

  The present invention has been made to improve the current situation.

The invention of the present application includes the structure of each claim .
“It has a back inner shell that receives the body pressure of the seated person and a resin back outer shell that covers this from behind, and the back inner shell has the strength to support the body pressure of the seated person, The back inner shell is attached to the back outer shell via a reinforcing bracket. ''
This is the basic configuration. In this case, the entire back inner shell may be covered with the back outer shell, or an appropriate upper range of the back inner shell may be exposed on the back outer shell.

According to the first aspect of the present invention, in the basic configuration, a portion of the back outer shell to which the reinforcing metal fitting is attached has strength as a strength member that supports a load, The portion above the mounting portion of the reinforcing metal fitting mainly functions as a cover.

State of the invention of claim 2, Oite the basic construction described above, the reinforcement fitting, which to either or both of said back inner shell and the back outer shell, with play is not fixed It is fitted with.

According to a third aspect of the present invention, in the second aspect of the present invention, the reinforcing metal fitting has a forward lower portion that fits into the back outer shell and an upward column portion into which the back inner shell fits. It is fitted into the outer shell and is not fixed, and the upward support column is fitted into the back inner shell and is not fixed.

In the case of Claims 2 and 3 , the reinforcing bracket may be fitted with slight play (clearance, backlash) to the back outer shell or the back inner shell so as to feel movement with human hands. Although it does not feel loose even if it tries to move, it may be in a fitting state that can be displaced when a load is applied.

In Claim 4 , in any one of Claims 1-3 , the said reinforcement metal fittings are the left-right laterally long joint bar which connects these joint bars integrally, and several joint bars of the up-down longitudinally arranged arrange | positioned on either side. It is composed of stays.

According to a fifth aspect of the present invention, in the above basic configuration , the back inner shell is moved back and forth, left and right, and up and down with respect to the back outer shell by catch means that is fitted by moving the back inner shell downward. Held impossible.

According to the invention of claim 1, since the back inner shell is a rigid body and is attached to the back outer shell via the reinforcing metal fitting, the portion of the back outer shell that is approximately above the attachment position of the reinforcing metal fitting has high strength. It is not necessary to have In addition, the portion of the back outer shell above the attachment portion of the reinforcing metal fitting can function mainly as a cover without having high strength.

  As a result, it is possible to prevent or suppress the occurrence of sink marks by reducing the range in which the ribs are provided on the back outer shell, and further to improve the quality by preventing the lowering of the backrest aesthetics. Covering the entire back inner shell with the back outer shell and attaching a reinforcing bracket to the lower part of the back outer shell makes it possible to configure a considerable range of the back outer shell visible from behind, with little or no ribs. is there.

  Now, when a person uses a chair, the centerline of the back and the centerline of the backrest do not always match, so that the backrest is leaning to the right or left and leans on the backrest or stretches back. Then, you can drown in various ways. For this reason, an uneven load such as a twist may be applied to the backrest.

  In the present invention, the reinforcing metal fitting can be fixed to the back outer shell with a fastener such as a screw. However, if the reinforcing metal fitting is firmly fixed to the back outer shell, depending on the case, the reinforcing metal fitting may be caused by an uneven load. It is likely that stress concentrates easily on a specific part of the back outer shell.

On the other hand, if the reinforcing metal fitting is made non-fixed as in claims 2 and 3 , even if an eccentric load is applied to the back inner shell, slipping or shifting occurs between the reinforcing metal fitting and the back outer shell. The stress can be prevented from concentrating on a specific portion of the back outer shell. As a result, a measure for excessively thickening the mounting portion of the reinforcing metal fitting in the back outer shell becomes unnecessary, and high strength can be secured without incurring costs.

In particular, it is particularly preferable to unfix both the back outer shell and the back inner shell as in claim 3 because stress concentration can be prevented in both the back outer shell and the back inner shell. In order to disperse the uneven load, it is preferable that the force applied to the member is the same even if the direction of the load changes. From this point, it is preferable to use a pipe or bar with a circular cross section as the reinforcing bracket. preferable.

In addition, even if it is resin or metal, it expands / shrinks due to temperature change, but since the thermal expansion coefficient of metal is different from the thermal expansion coefficient of resin, the reinforcing bracket is firmly fixed to the back outer shell. , the stress is generated in the back outer shell by the difference in thermal expansion, the support strength of the load due to this reason occupant may become weak, and non-fixed manner a reinforcing bracket as claimed in claim 2, heat Since it is possible to prevent stress from being generated in the back outer shell due to the difference in expansion coefficient, it is possible to prevent a decrease in support strength.

The reinforcing metal fittings can be set in various modes. However, when the structure of claim 4 is adopted, the joint bars having the connecting function of the back outer shell and the back inner shell are reinforced by the stays, so It is suitable. In this case, if the joint bar is made of a metal pipe or a metal rod, there is an advantage that the processing cost can be suppressed.

The back inner shell and the back outer shell can be fastened with a fastener such as a screw. However, when the catch method is employed as in claim 5 , the assembly is simplified. Further, since the back outer shell and the back outer shell can move slightly in the catch portion, stress concentration when an unbalanced load is applied can be suppressed.

It is an external view of the chair which concerns on embodiment, (A) is the perspective view seen from the front, (B) is the perspective view seen from back. It is a partial fracture perspective view in the state where a cushion was omitted. It is a partial fracture separation perspective view in the state where a cushion was omitted. It is a vertical side view of a center part. It is a perspective view around a back outer shell and a base. It is an isolation | separation perspective view in the state which fell the seat board. It is a separate perspective view which shows the attachment method of a seat board. It is the perspective view which isolate | separated the element of the backrest. (A) is the perspective view which looked at the back inner shell to which the reinforcement metal fitting was attached from back, (B) is the partial perspective view of a back inner shell, (C) is the partial perspective view of a back outer shell. It is a separation perspective view of a back outer shell and a back inner shell. It is a figure which shows the attachment procedure of a back inner shell. (A) is the partial isolation | separation perspective view of the upper part of a back outer shell, (B) is a perspective view of a hole cover, (C) is the perspective view which looked at the auxiliary tool attachment part in a back inner shell from back. It is a figure which shows the auxiliary tool attachment part in a back inner shell, (A) is the perspective view seen from back, (B) is the perspective view seen from the front.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the following description, the words “front and rear” and “left and right” are used to indicate directions. These front and rear and left and right words are those who are seated in a rocking chair (hereinafter simply referred to as a chair) in a normal posture. Based on the direction in which

(1). Outline First, the outline will be explained. The chair of this embodiment is applied to a so-called swivel chair that is frequently used for office work. As shown in FIGS. 1 to 4, the chair includes a leg column (gas cylinder) 2 and branch legs as main elements. A leg 1 having a base 3, a base 3 fixed to the upper end of the leg support 2, a seat 4 disposed above the base 3, and a backrest 5 connected to the base 3 so as to be tilted rearwardly. A caster is provided at the tip of each branch leg constituting the leg 1. An armrest can be attached to the left and right side surfaces of the base 3 as an optional product.

As shown in FIG. 5, the base 3 is made of sheet metal, has a box shape with an upward opening having a bottom plate and left and right side plates 3 a, and is long in the front-rear direction. Also, as best shown in FIG. 4, the base 3 of which is provided a lower member 6 of the upward opening downward, is fitted to the upper end of the leg support post 2 into the bush 7 which penetrates into the lower member 6 and the base 3 . The front of the leg support post 2 of the base over scan 3 is provided with a support member 8 for attaching the armrests. As clearly shown in FIG. 5, left and right side flanges 3 b that are long in the front-rear direction are provided at the upper ends of the left and right side plates 3 a constituting the base 3.

  As shown in FIG. 4, the seat 4 includes a resin seat inner shell (seat plate) 9 and a cushion 10 disposed thereon as main elements, and the cushion 10 is a skin material (not shown) such as cloth or leather. )). A hinge portion 9a having a large number of horizontally long recesses is formed at the rear portion of the seat inner shell 9, and the rear rear portion 9b can tilt backward relative to the front portion by the hinge portion 9a. As shown in FIGS. 2 and 3, the seat inner shell 9 is covered with a lower cover (seat outer shell) 11.

  For example, as shown in FIGS. 3 and 4, the backrest 5 includes a resin back outer shell 12, a resin back inner shell (back plate) 12 disposed on the front surface thereof, and a cushion 14 disposed on the front surface of the back inner shell 13. The cushion 14 is covered with a skin material such as a cloth.

  As can be understood from FIGS. 2 to 4, the back outer shell 12 has a submerged portion 15 that enters under the seat 4. The submerged portion 15 has a bifurcated shape separated left and right so as to be positioned on both the left and right sides of the base 3, and a left and right longitudinal support shaft 16 is spanned between the front ends of the left and right submerged portions 15. Is attached to the front end of the submersion 15 via a bearing 17. The bearing 17 is made of resin, is fitted into the tip of the submerged portion 15 from the outside, and overlaps the flange 3 b of the base 3 from above. A portion overlapping the flange 3b is a flat surface.

  As shown in FIGS. 2 to 5, a rocking spring (compression coil spring) 18 that expands and contracts in the front-rear direction is disposed inside the base 3. The locking spring 18 is supported by front and rear spring receivers 19 and 20, and the rear spring receiver 20 is fixed to the left and right intermediate portion of the support shaft 16. Accordingly, the rear spring receiver 20 moves back and forth together with the support shaft 16. On the other hand, the front spring receiver 19 is fixed to the front surface of the base 3 by welding, and a laterally long support bar 21 is fixed to the upper end of the front spring receiver 19.

  As shown in FIG. 5, the base 3 is formed with a rearward projecting portion 3c protruding rearward between the left and right submerged portions 15 of the back outer shell 12, and the rear end portion of the rearward projecting portion 3c has a laterally long lateral shape. The guide shaft 22 is fixed. The guide shaft 22 protrudes to the left and right outside of the rear end portion of the rearward projecting portion 3 c, and the protruding tip portion is fitted in a guide groove 23 provided on the inner surface of the submerged portion 15 in the back outer shell 12.

  The guide groove 23 has a substantially upwardly concave circular arc shape when viewed from the side, and the back outer shell 12 (backrest 5) tilts backward about the support shaft 16 while being guided by the guide groove 23 and sinking. That is, it tilts backward while moving the pivot fulcrum toward you.

  Although details are omitted, the flange 3b of the base 3 is held from below by a holding piece provided on the seat inner shell 9, and the seat inner shell 9 is held so that it cannot be pulled out. The seat inner shell 9 is supported by the flange 3b of the base 3 via the bearing 17 so as to be movable back and forth, and is also supported by the support bar 21 so as to be movable back and forth.

(2). Connection structure between the back outer shell and the seat inner shell The back outer shell 12 and the seat inner shell 9 are connected, and when rocking, the backrest 5 descends while tilting backward about the support shaft 16. The seat 3 moves forward with this movement. In addition, the rear portion of the seat 9 tilts backward when moving forward.

  Therefore, a connection structure between the back outer shell 12 and the seat inner shell 9 will be described. As shown in FIGS. 6 and 7, a lower front catch 27 having left and right inward claws 26 is provided in the rear portion of the seat inner shell 9 near the left and right ends, while the back outer shell 12 is submerged. The part 15 is provided with a rear catch 28 into which the front catch 27 is fitted from the front. The rear catch 28 is provided with an outward claw 29 with which the inward claw 26 of the front catch 27 is engaged so that it cannot be pulled upward.

  In addition, a stopper claw 30 extending toward the front is provided on the left and right inner sides of the rear catch 27 of the seat inner shell 9, while the stopper claw 30 fits into the submerged portion 15 of the back outer shell 12 from above. A stopper hole 31 is provided.

  The stopper claw 30 has a free end at the front end, and a claw portion formed at the front end has an inclined surface that becomes higher as going back. For this reason, when the seat inner shell 9 is shifted rearward with the front catch 27 fitted to the rear catch 28, the stopper pawl 30 is elastically deformed so as to be raised upward, and then the seat inner shell 9 is fully pushed. The original posture is restored by the elastic restoring force, and the claw portion of the stopper claw 30 is fitted into the stopper hole 31 from above. Thereby, the seat inner shell 9 is held so as not to move back and forth.

  A hook-like rear claw 33 is provided rearward at the rear end of the seat inner shell 9, and a rib 34 is provided in the submerged portion 15 of the back outer shell 12 so that the rear claw 33 cannot be moved upward. This forcibly lowers the rear end of the seat inner shell 9 together with the back outer shell 12 during locking.

(3). Structure of the backrest Next, the structure of the backrest 5 will be described. The back outer shell 12 of the backrest 5 functions as a strength member. For example, as shown in FIG. 5, a large number of reinforcing ribs 36 are provided in the submerged portion 15 and a portion connected thereto.

  More precisely, as shown in FIG. 5 with reference numerals, the back outer shell 12 is composed of an upright portion 12a extending generally in the vertical direction and an inclined portion 12b connected to the lower end of the back outer shell 12 toward the lower side of the seat. In the inclined portion 12b, about half of the tip side is the submerged portion 15, but reinforcing ribs 36 are provided on the entire inclined portion 12b and the lower end portion of the standing portion 12a. Therefore, most of the upright portions 12a are not provided with the reinforcing ribs 36 (this is not intended to exclude the reinforcing ribs and is not necessary).

  As shown in FIGS. 5 to 8, the back outer shell 12 and the back inner shell 13 are connected via a substantially H-shaped reinforcing metal fitting 37. The reinforcing metal fitting 37 is composed of a vertically elongated left and right joint bar 38 and a horizontally elongated stay 39 that integrally connects the left and right joint bars 38.

  The joint bar 38 is made of a round pipe such as a steel pipe as an example, and has a forward facing lower portion 38a, an upward supporting column portion 38b, and an intermediate portion 38c that connects the two, and the adjacent portions are directed toward the front in a side view. Bent into a concave shape. The forward-facing lower portion 38 a is fitted from behind to the tunnel portion 40 formed in the sinking portion 15 of the back outer shell 12. The intermediate portion 38 c is fitted in a holding groove 41 provided in the back outer shell 12. The upward support portion 38 b of the joint bar 38 is fitted into the cylindrical portion 42 in a downward direction provided on the rear surface of the back inner shell 13.

In this case, the joint bar 38 is not fixed with respect to the back outer shell 12 and the back inner shell 13 but is simply fitted. The joint bar 38 is fitted to the tunnel portion 40, the holding groove 41, and the cylindrical portion 42 with a slight play (backlash, clearance). The clearance may be a few millimeters to a millimeter.

  As shown in FIGS. 8 and 9, the periphery of the back inner shell 13 is constituted by an outer peripheral rib 43. Inside the outer peripheral rib 43, two left and right vertical main ribs 44 and two upper and lower (two pairs) horizontally long are provided. A main rib 45 is formed, and a crossed center rib 46 is provided in a portion surrounded by the vertically long main rib 44 and the horizontally long main rib 45. Further, upper ribs 47 are provided on the upper and lower sides, and side ribs 48 are provided on the left and right sides.

  By the group of these ribs, the back inner shell 13 functions as a strength member that supports the load (body pressure) of the seated person. Therefore, the back inner shell 13 has a rigid structure that does not deform due to the body pressure of the seated person (the rib for maintaining the strength is not limited to the illustrated mode, and various modes can be adopted). The cylindrical portion 42 is configured by opening the lower end of the vertically long main rib 44 downward.

  In particular, as shown in FIGS. 9 and 10, two pairs of left and right upper male catches 50 and a pair of left and right disposed on the left and right sides are provided on the inner side of the upper rib 46 and the side rib 47 on the rear surface of the back inner shell 13. An intermediate male catch 51 and a pair of left and right lower male catches 52 arranged on the left and right side portions are provided, while an upper female catch 50 in which the upper male catch 50 is fitted to the back outer shell 12 from above is provided. 53, an intermediate female catch 54 into which the intermediate male catch 51 fits, and a lower female catch 55 into which the lower male catch 52 fits.

  Further, a pair of left and right stopper claws 56 are provided on the inner side of the lower inner shell 13 on the left and right sides of the lower male catch 52, while the stopper claws 56 are hooked and engaged with the front surface of the back outer shell 12. A stopper wall 57 is provided.

Each male shaped catch 50, 51 and 52 protrudes rearwardly, UeTakeshikatachi catch 50 and Shitayugata catch 5 1 is provided with one of claws 58 to the left and right outer, intermediate male catches 51 left and right Claw pieces 58 are provided. On the other hand, each of the female catches 53, 54, 55 has a substantially box shape having left and right walls and a bottom plate 59 so that the male catches 50, 51, 52 fit from above. The lower female catch 55 is provided with one inward restricting piece 60 that holds the claw pieces 58 of the upper and lower male catches 50 and 52 in front of each other, and the intermediate female catch 54 has an intermediate male catch 54. Corresponding to 51 having left and right claw pieces 58, a pair of left and right inward restriction pieces 60 are provided.

The male catches 50, 51, 52 are held by the female catches 53, 53, 55 so that they cannot move left and right, cannot move back and forth, and cannot move downward. The male catches 50, 51, 52 are fitted into the female catches 53, 54 , 55 from above, but the upper ends of the respective restricting pieces 60 are provided for guiding (inviting) the male catches 50, 51, 52 to be fitted. Is provided with a guide portion 60a that is inclined (tilted forward) toward the front.

  Then, as shown in FIG. 11, in the side view, the inclination posture of the upward support column portion 38b in the reinforcing bracket 37 and the inclination posture of the guide portion 60a of each regulating piece 60 are set to be substantially the same (the upward support column portion 38b and the guide). And the male catches 50, 51, 52 are respectively fitted to the female catches 53, 54, 55 after the cylindrical portion 42 of the back inner shell 13 is fitted to the upward support portion 38b. It is set to fit.

  For this reason, when the back inner shell 13 is fitted into the upward support portion 38 b of the reinforcing metal fitting 37 and moved downward, the male catches 50 to 52 are automatically fitted into the female catches 53 to 55. For this reason, attachment of the back inner shell 13 can be easily performed with one touch. The guide part 60a may be tilted slightly forward from the upward column part 38b.

  The lowering lower limit of the back inner shell 13 is regulated by each male catch 50-52 hitting the bottom plate 59 of the female catch 53-55. Then, the stopper claw 56 hits the stopper wall 57 by the downward movement of the back inner shell 13 and is elastically deformed so as to fall down to the near side. Then, when the back inner shell 13 is completely lowered, the stopper claw 56 returns and rotates. Migrate below. Thereby, the back inner shell 13 is held immovable upward. On the upper surface of the stopper wall 57, a guide rib 61 inclined in a side view is provided in order to guide the downward movement of the stopper claw 56.

  As described above, the back inner shell 13 is formed in the vertical direction, the front-rear direction, and the left-right direction by the male catches 50 to 52 and the female catches 53 to 55, the stopper claw 56, and the stopper wall 57. It is attached to the back outer shell 12 without rattling.

  The back inner shell 13 receives a backward moment due to the backward load applied by the seated person, and the moment acts strongly on the lower portion of the back inner shell 13. The back inner shell 13 and the back outer shell 12 are provided with the reinforcing bracket 37. Therefore, the moment acting on the back inner shell 13 is firmly supported by the lower portion of the back outer shell 12 via the reinforcing metal fitting 37.

  Accordingly, only the lower portion of the back outer shell 12 functions as a strength member, and most of the upright portions 12a do not need to maintain high strength. Therefore, most of the upright portions 12a have no or almost no reinforcing ribs 36. Can be molded into a state that does not. Thereby, quality degradation due to the occurrence of sink marks can be prevented.

  Further, since the joint bar 38 is fitted to the back outer shell 12 and the back inner shell 13 with a little play, as described above, not only is the assembly easy, but also the back inner shell 13 is subjected to an uneven load. It is possible to prevent the stress concentration due to the difference in thermal expansion coefficient and the advantage of preventing stress concentration when acting.

Joint bar 38 and the stay 39, etc. or a sheet metal or made of a square pipe, can be embodied in various forms. It is also possible to make the reinforcing metal fitting 37 an integral product made of sheet metal or aluminum die cast. It is also possible to arrange two joint bars 38 on the left and right , for example. Needless to say, the back outer shell 12 does not need to include the sinking portion 15.

  Therefore, the reinforcing metal fitting 37 is constituted by a single member having a certain right and left width and is arranged at the left and right middle part of the back outer shell, and the joint bar is arranged at three places of the right and left middle part and both sides thereof. Is also possible. The point is that any material or shape can be used for the reinforcing bracket 37 as long as it can maintain at least the strength that can withstand a backward moment from the seated person. The catch means is not limited to the illustrated form, and various structures (combinations) can be adopted.

  Although the cushion 14 is affixed to the back inner shell 13 of the embodiment, the back inner shell 13 may be configured in a frame shape that is open forward and backward, and a flexible member such as a mesh may be stretched thereon. In this case, the back outer shell does not cover most of the back inner shell 13.

(4). Auxiliary tool mounting portion of the backrest The chair of the present embodiment can mount an auxiliary tool such as a hanger on the upper end portion of the back inner shell 13. This point will be described next. As shown in FIG. 12, a left and right horizontally-long auxiliary tool mounting hole 65 that is closed by a removable cap 64 is opened at the upper end portion of the back outer shell 12, and the auxiliary tool mounting hole 65 of the back inner shell 13 is opened. Two nuts 66 on the left and right can be attached to the exposed part.

  The nut 66 has a U-shape that is open to the left and right outside in a plan view. A screw hole 67 is formed in the rear piece 66a, and a tap hole 68 is formed in the front piece 66b. The back inner shell 13 is provided with left and right holder portions 69 held by nuts 66. A portion between the left and right holder portions 69 is a space for allowing the nut 66 to be inserted. The holder portion 69 has a hole for allowing a screw (not shown) to pass therethrough.

  The front surface of the holder portion 69 is slightly lower than the upper rib 46 of the back inner shell 13. For this reason, the nut 66 does not protrude before the upper rib 46. The holder portion 69 is connected to the outer peripheral rib 43 and the upper rib 46 via a rib 70. For this reason, support strength, such as a hanger, is high. Since the nut 66 is provided with a tap hole 68 in the front surface 66a, the holder portion 69 is clamped by the nut 66 when an auxiliary tool such as a hanger is fastened with a screw. Therefore, the fastening strength can be further improved.

  Further, as shown in FIG. 13B, a square hole 71 is formed in front of the holder portion 69. The square holes 71 are through holes for forming the holder portion 69 with the front and rear molds. Due to the presence of this square hole 71, the nut 66 can be fitted into the holder portion 69 from the side. Even if the tip of the screw is exposed to the front from the front piece 66 b of the nut 66, the exposed tip is stored in the square hole 71, so that the screw does not reach the cushion 14.

  As a means for attaching the hanger to the back of the chair, JP 2010-158270 A discloses that the bracket is fixed to the boss provided on the back inner shell with a screw and the hanger is attached to the bracket. .

  However, in this publication, since a tapped hole is provided in the resin-made inner back shell, the phenomenon that the female screw is crushed easily occurs and the strength is uneasy.

On the other hand , when a configuration in which the holder portion 69 is held by using a U-shaped nut 66 as in the present embodiment , the phenomenon that the female screw is crushed can be remarkably suppressed because the nut 66 is made of metal. . Further, even if the female screw is crushed, it is sufficient to replace the nut 66, so that a situation in which it becomes impossible to attach an auxiliary tool such as a hanger does not occur.

  Furthermore, since the nut 66 is U-shaped, the nut 66 is held in a set state and can be prevented from falling off, so that it is possible to reduce the trouble of attaching the auxiliary tool. Moreover, since the screw hole 67 is vacant in the rear piece 66a, when the screw is inserted into the screw hole 67, the screw core and the tapped hole 68 core are automatically aligned so that the screwing can be performed smoothly.

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

3 base 4 seat 9 seat inner shell 12 back outer shell 13 back inner shell 15 slip part 36 reinforcing ribs 37 reinforcing brackets 38 joint bar 38a forward bottom 38b upward struts 39 stay 40 tunnel portion 41 retaining groove 42 the cylindrical portion 50-52 Male catch 53-55 Female catch

Claims (5)

It has a back inner shell that receives the body pressure of the seated person and a resin back outer shell that covers this from behind, and the back inner shell has a strength that can support the body pressure of the seated person, The back inner shell is configured to be attached to the back outer shell via a reinforcing bracket ,
The portion of the back outer shell to which the reinforcing bracket is attached has strength as a strength member that supports a load, and the portion of the back outer shell that is approximately above the mounting portion of the reinforcing bracket. Serves mainly as a cover,
The back of the chair. It has a back inner shell that receives the body pressure of the seated person and a resin back outer shell that covers this from behind, and the back inner shell has a strength that can support the body pressure of the seated person, The back inner shell is configured to be attached to the back outer shell via a reinforcing bracket,
The reinforcing metal fitting is fitted to the back inner shell and the back outer shell in a state where there is play without being fixed to either or both of the back inner shell and the back outer shell.
The back of the chair. The reinforcing metal fitting has a forward facing lower portion that fits into the back outer shell and an upward strut portion into which the back inner shell fits, and the forward facing lower portion is fitted into the back outer shell and fixed. The upward support column is fitted into the back inner shell and is not fixed,
The chair back according to claim 2 . The reinforcing metal fitting is composed of a plurality of vertically elongated joint bars arranged on the left and right sides, and left and right horizontally elongated stays that integrally connect the joint bars.
The backrest of the chair described in any one of Claims 1-3 . It has a back inner shell that receives the body pressure of the seated person and a resin back outer shell that covers this from behind, and the back inner shell has a strength that can support the body pressure of the seated person, The back inner shell is configured to be attached to the back outer shell via a reinforcing bracket,
The back inner shell is held so as to be unable to move back and forth, left and right, and up and down with respect to the back outer shell by catch means that is fitted by moving the back inner shell downward.
The backrest of the chair child.

Images