JP2015077339A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair, even when an additional functional component fitted to a backrest part is directly held, less likely to produce a large moment at a fitting part of the additional functional part, and preventing the additional functional part from exerting harmful effects on sitting comfort.SOLUTION: An upper-side edge of a backrest part 6 includes an opening part 26 that has an upper wall 25 continuing to a back receiving surface side of the backrest part 6, and an end wall 22 disposed down below the upper wall 25. The end wall 22 includes a fitting part of a hanger unit 48.

Description

  The present invention relates to a chair having an improved structure of an attachment portion for an additional functional component attached to a backrest portion.

As a chair used for office work or the like, there is a chair that is easy to grip the backrest part by curving the upper edge of the backrest part backward or by bending it in a U shape.
Also, chairs used for office work etc. can be freely attached with additional functional parts such as a hanger unit for hanging clothes on the back side of the backrest and a headrest that supports the head of the seated person. There is. In the case of this type of chair, it is desirable to install additional functional parts such as a hanger unit and a headrest in a portion closer to the upper end portion of the backrest portion. That is, in the case of a hanger unit, the clothes can be prevented from touching the floor surface by raising the clothes hanging position by the hanger part. In the case of the headrest, the support position is set to the seated person. By approaching the head of the person, it becomes easier to support the seated person's head more stably.

  Even in the former chair that makes it easy to grip the upper edge of the backrest, an additional functional component has been devised in a portion closer to the upper end of the backrest (for example, a patent) References 1 and 2).

  The chair described in Patent Document 1 is provided with an overhang portion that opens downward in a substantially U shape at the upper edge of the backrest portion, and an additional functional component ( (Hanger unit) mounting portion is provided. In the case of this chair, a bracket extending in a substantially U-shape forward from the component main body block of the additional functional component is attached, and the extending end portion of the bracket is inserted into the overhang portion and fixed to the attachment portion. It is like that.

  Moreover, the chair described in Patent Document 2 is provided with an attachment portion in the upper space of the inner shell communicating with the inside of the cushion material of the backrest portion, and the additional functional component is fixed to the attachment portion. .

JP 2012-135490 A JP 2013-103069 A

  However, the chair described in Patent Document 1 has a structure in which the additional functional component is fixed to the mounting portion in the overhang portion via a bracket that extends long in a substantially U shape forward from the component main body block. Therefore, when the additional functional part attached to the backrest part is directly gripped for chair movement or the like, a large moment acts on the bracket or the attachment part. For this reason, a large reinforcing structure must be added to the mounting portion of the additional functional component.

  In addition, since the chair described in Patent Document 2 is close to the component main body block of the additional functional component and the mounting portion, even if the additional functional component is directly gripped for chair movement or the like, a large moment is unlikely to occur. Since the attachment part of the additional function part is inserted into the cushion material, the feel of the attachment part of the additional function part is easily transmitted to the back of the seat occupant when the seat occupant strongly falls into the backrest part.

  Therefore, the present invention is unlikely to cause a large moment in the additional function component mounting portion even when the additional function component mounted on the backrest is directly gripped, and the additional function component mounting portion has an adverse effect on the sitting comfort. It is intended to provide a chair that does not affect.

The chair according to the present invention employs the following configuration in order to solve the above problems.
The backrest includes a backrest support body connected to a chair body including a seat body, and a backrest body supported by the backrest support body, and the back rising from the lower end to the upper side. In a chair in which an upper edge of the upper part extends toward the rear side and a mounting part for an additional functional part is provided on the upper back side of the back part, an upper edge of the back part is provided on the upper edge of the back part. An opening having an upper wall continuous to the back support surface side of the backrest and a lower wall disposed below the upper wall is provided, and the mounting portion is provided on the lower wall. It is characterized by this.
In the case of this invention, since the attachment portion is provided on the lower wall of the backrest portion, and the additional functional component is attached to the attachment portion of the lower wall, the dimension in the front-rear direction of the attachment portion of the additional functional component can be shortened. . For this reason, even if the additional functional part attached to the backrest part is gripped and the chair is moved, a large moment is unlikely to act on the attachment part of the additional functional part. In addition, if the seat of the seated person is drowning strongly in the backrest because the mounting portion of the additional function component is provided on the lower wall of the backrest and the mounting portion of the additional function component is not within the range of the thickness direction of the upper wall In addition, the feeling of the attachment part of the additional functional parts is not easily transmitted to the seated person.

A downwardly protruding piece projecting downward is provided on the lower surface of the lower wall, and the mounting portion is provided with the additional functional component fitted to the upper surface of the lower wall and the outer surface of the downward piece, Additional functional parts may be fastened and fixed.
In this case, since the additional functional component is fastened and fixed to the mounting portion in a state where the additional functional component is fitted to the upper surface of the lower wall and the outer surface of the downward facing piece, the mounting strength of the additional functional component can be increased.

Below the lower wall, a substantially U-shaped portion surrounded by a lower surface of the lower wall and an inner side surface of the downward piece is provided, and the additional functional component includes an upper surface of the lower wall and the downward piece. A component main body block fitted to the outer side surface, and a sandwiching block fitted from below into the substantially U-shaped portion, the component main body block and the sandwiching block comprising the component main body block In the state where the upper surface of the lower wall and the outer side surface of the downward piece are fitted and the clamping block is fitted in the substantially U-shaped portion, the mounting portion is sandwiched between them so as to be fastened and fixed to each other. Anyway.
In this case, the additional function parts can be stably held on the lower wall because the component body block and the clamping block of the additional function parts are fastened and fixed to the lower wall in a state where they are respectively fitted on the upper and lower sides of the lower wall. In addition, since the rigidity of the lower wall itself is enhanced by the fitting of the component main body block and the clamping block, it is possible to rigidly receive the moment acting from the additional functional component.

It is desirable that the component main body block and the clamping block are provided with positioning portions that contact each other.
In this case, the component main body block and the sandwiching block are respectively fitted to the lower wall in the upper and lower directions, and in this state, the component body block and the sandwiching block are mutually positioned by the positioning unit, whereby the component body block, the lower wall, and the sandwiching block. It is possible to accurately position the three members and perform the fastening operation smoothly.

It is desirable that the downward piece protrudes downward from the extended end of the lower wall.
In this case, since there is no portion protruding rearward from the downward piece, the additional functional component can be easily attached to the downward piece.

  According to the present invention, an opening having an upper wall continuous to the back support surface side of the backrest and a lower wall disposed below the upper wall is provided at the upper edge of the backrest. Since the additional functional parts can be installed in the mounting part provided on the lower wall, the additional functional parts attached to the backrest part are also large when the additional functional parts are directly gripped. The moment is less likely to occur, and the mounting portion of the additional functional component does not adversely affect the sitting comfort.

It is a side view of the chair of one Embodiment of this invention. It is a rear view of the chair of one Embodiment of this invention. It is a rear view of the back board of one Embodiment of this invention. It is the rear view which removed the cover member of the backrest main body of one Embodiment of this invention. It is sectional drawing corresponding to the VV cross section of FIG. 4 of the backrest main body of one Embodiment of this invention. It is a side view of the chair of one Embodiment of this invention. It is a rear view of the chair of one Embodiment of this invention. It is sectional drawing corresponding to the VIII-VIII cross section of FIG. 7 of the chair of one Embodiment of this invention. It is a perspective view of the additional functional component of the chair of one Embodiment of this invention. It is a one part perspective view of the additional functional component of the chair of one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the following description, the direction indicated by the arrow FR in the figure facing the front of the person seated in the chair in a regular posture is referred to as “front”, and the opposite direction is referred to as “rear”. For “upper”, “lower”, “left”, and “right”, the direction indicated by the arrow UP in the figure above the person sitting on the chair in a regular posture is “up” and the opposite direction is “ The direction indicated by the arrow LH on the left side of the person seated in a normal posture on the chair is called “left”, and the direction opposite to that is called “right”.

1 and 2 are a side view and a rear view showing the overall configuration of the chair 1 of this embodiment.
As shown in these drawings, a chair 1 according to this embodiment includes a leg 2 placed on a floor F, a box-shaped support base 3 installed at the upper end of the leg 2, and a seated person. A seat body 4 that is attached to the upper surface of the support base 3 and supports the seat body 4, and supports the back of a seated person that extends from the support base 3 to the rear upper side and is seated on the seat body 4. And a backrest portion 6. In this embodiment, the leg part 2, the support base 3, the seat receiving member 5, and the seat body 4 constitute a chair body part.

  The leg 2 includes a multi-leg 7 with casters 7 a and a pedestal 8 that stands up from the center of the multi-leg 7 and incorporates a gas spring as a lifting mechanism, and has a support base 3 at the upper end of the pedestal 8. Is mounted so as to be rotatable in the horizontal direction. The support base 3 incorporates an elevation adjustment mechanism for the pedestal column 8 and a tilt adjustment mechanism for the backrest 6. The backrest 6 directly supports the backrest support frame 9 (backrest support) having a substantially L shape in side view and the back of the seated person seated on the seat 4 attached to the rear upper part of the backrest support frame 9. A backrest main body 10, and a front lower end of the backrest support frame 9 is connected to a tilt adjustment mechanism in the support base 3.

  The backrest body 10 of the backrest portion 6 includes a back plate 11 constituting a skeleton portion, a cushion material 12 (see FIG. 5) made of urethane or the like disposed on the front surface side of the back plate 11, and an outer surface of the cushion material 12. And a sheet-like upholstery material 13 that covers a portion of the outer peripheral edge of the back plate 11 and a cover member 14 that covers the back side (rear side) of the back plate 11. In the case of this embodiment, the cushion material 12 is integrally joined to the back surface of the upholstery material 13 by heat welding.

3 is a view of the back plate 11 as viewed from the back side, FIG. 4 is a view of the backrest body 10 with the cover member 14 removed, as viewed from the back side, and FIG. It is sectional drawing corresponding to.
The back plate 11 is made of a synthetic resin having elasticity. The back plate 11 is formed in a vertically long, substantially rectangular shape with rounded four corners when viewed from the front, and can support a portion extending from the waist to the back of the seated person on the front side. The back plate 11 supports the vicinity of the occupant's waist at a height position of about one third from the bottom in the height direction, and supports the vicinity of the back of the seat occupant in a region above it. In the following description, the region of the back plate 11 that supports the vicinity of the back of the seated person is referred to as a “back support region 11a”, and the region that supports the vicinity of the back of the seated person is referred to as the “back support region”. 11b ".

The back plate 11 constitutes a bulging region in which the waist support region 11a is curved in a convex shape in the side view, and the portion first contacts the waist of the seated person. In addition, the front surface of the back plate 11 has a shape in which a horizontal section of almost the entire area in the vertical direction is curved in a concave shape on the rear side. The concave shape of the front surface of the back plate 11 changes in the depth of depression in the vertical direction, and the vicinity of the middle portion in the vertical direction of the waist support region 11a is the largest. Further, the outer peripheral edge portion of the back plate 11 is curved toward the back surface side. In particular, the upper edge portion 11c is greatly curved toward the rear side so that the terminal portion approaches a substantially horizontal posture.
3 and 4, reference numeral 90 is used to obtain a flexible deformation of the back plate 11 in a region extending from a substantially central position in the vertical direction of the waist support region 11 a of the back plate 11 to the back support region 11 b. There is a slit formed.

  On the back side of the back plate 11, a locking groove 15 is formed in an annular shape so as to substantially follow the outer peripheral shape of the back plate 11. The locking groove 15 is formed by an inner wall portion 15a and an outer wall portion 15b that protrude from the back surface of the back plate 11. The locking groove 15 is provided at a position spaced from the outer peripheral end of the back plate 11 toward the central region side by a set distance. As will be described in detail later, a peripheral edge portion 13a of a tension member 13 covering the back plate 11 is inserted into the locking groove 15 and locked. At appropriate positions on the inner wall portion 15a of the locking groove 15, a retaining projection 16 for restricting the removal of the peripheral edge portion 13a of the tension member 13 is projected. In the case of this embodiment, the retaining protrusions 16 are provided at the corners of the four corners of the locking groove 15 and at substantially the center positions of the upper side and the lower side.

  Further, in the back surface of the back plate 11, the region between the left and right sides of the back plate 11 and the outer wall portion 15 b facing the side is extended in the width direction of the back plate 11. A plurality of reinforcing ribs 17 that connect the side edges and the outer wall portion 15b are provided. The horizontal cross-section of the back plate 11 is that the waist support region 11a is the most concavely recessed, so that the reinforcing ribs 17 disposed in the waist support region 11a protrude in the front-rear direction according to the recessed depth of the recess. The height is higher than the protruding height of the other reinforcing ribs 17.

On the other hand, the tension member 13 covering the front surface and the outer peripheral edge portion of the back plate 11 has its peripheral edge portion 13a folded back to the back side at the outer peripheral edge portion of the back plate 11, and in this state, the peripheral edge portion 13a is It is constricted and fixed to the back side of the back plate 11.
Specifically, as shown in FIG. 5, a continuous ring-shaped insertion portion 19 is provided on the peripheral portion 13 a of the upholstery material 13 by sewing a resin thread, and a tightening string is attached to the insertion portion 19. Article 18 is passed. And when fixing the peripheral part 13a of the upholstery material 13 to the back surface side of the backplate 11, the peripheral edge part 13a of the upholstery material 13 is turned back to the back side of the backplate 11, and the tightening string 18 is moved to the inner side in that state. The loop is tightened so as to be narrowed, and as shown in FIG. 4, the end of the tightening string 18 in a state where the tightening string 18 and the peripheral portion 13 a of the tension member 13 are inserted into the locking groove 15. To unite each other. Thus, when the fastening string 18 is bound, the peripheral edge portion 13a of the tension member 13 is fixed in the locking groove 15, and the fastening string 18 and the peripheral edge portion 13a are prevented from coming off from the locking groove 15. It is regulated by the protrusion 16.
As a result, the tension member 13 covering the front surface and the outer peripheral edge portion of the back plate 11 has the peripheral edge portion 13a drawn into the back surface side of the back plate 11 to increase the tension on the front surface side of the back plate 11, and the back plate 11 The relative position with respect to is fixed. When the tension member 13 is fixed to the back plate 11 in this way, the locking groove 15 is formed substantially along the outer peripheral shape of the back plate 11, so that the peripheral portion 13 a of the tension member 13 is shown in FIG. 4. As shown, it is fixed in a state that is substantially similar to the outer peripheral shape of the back plate 11. In addition, the part which covers each corner | angular part of the back board 11 of the upholstery material 13 shall be called "the corner | angular part coating | coated part 13b" hereafter.

By the way, the cover member 14 that covers the back surface side of the back plate 11 is fixed to the back surface side of the back plate 11 by appropriate means such as uneven fitting. In the case of this embodiment, the extending portion 9 a of the backrest support frame 9 that rises upward from the rear side of the seat body 4 is fastened and fixed to the front surface side of the cover member 14. The front side of the extension 9 a of the backrest support frame 9 is covered with a back plate 11. In this embodiment, the cover member 14 also functions as a strength member that supports the input load from the seated person together with the backrest support frame 9, and thus is formed of a highly rigid synthetic resin.
Note that the cover member 14 is not necessarily a strength member. In this case, the back plate 11 may be directly connected to the backrest support frame 9.

  As shown in FIG. 2, the cover member 14 extends from the central region in the direction of the corner covering portion 13 b at the four corners of the tension member 13 from the center region, and covers four overhang portions covering the back side of each corner covering portion 13 b. 20, two recesses 21 that are between the left and right overhanging portions 20 and between the right and left overhanging portions 20 and are recessed inwardly in the backrest width direction with respect to a virtual straight line L1 connecting the upper and lower overhanging portions 20 And. In the case of this embodiment, the left and right recesses 21 of the cover member 14 are provided at positions corresponding to the portions that bulge to the front side of the waist support region 11 a of the back plate 11. The concave portion 21 of the cover member 14 is recessed inward in the width direction as compared with the upper and lower projecting portions 20, but the edge portion of the concave portion 21 covers at least the back surface side of the peripheral edge portion 13 a of the tension member 13. Yes.

  A gripping block 50 that is curved in a substantially L shape toward the lower part of the rear part is integrally extended at the upper end of the cover member 14. The grip block 50 is formed over substantially the entire width direction of the upper side of the cover member 14. The grip block 50 is configured so that the backrest 6 can be easily gripped when the chair 1 is moved by placing a fingertip on the inside of the curved portion from below. Further, as will be described in detail later, a hanger unit 48 (see FIG. 6 and the following drawings) as an additional functional part can be freely attached to the grip block 50.

6 and 7 are a side view of the chair 1 to which the hanger unit 48 is attached and a rear view of the backrest portion 6, and FIG. 8 is a cross-sectional view corresponding to the VIII-VIII cross section of FIG. 9 and 10 are a perspective view showing the entire hanger unit 48 and a perspective view showing some components.
As shown in FIGS. 6 to 8, the grip block 50 includes an end wall 22 (lower wall) extending substantially horizontally from the upper end of the cover member 14 to the rear, and a rear side of the end wall 22. A downwardly extending piece 23 inclined slightly rearward from the extending end and extending downward, and a projecting piece 24 protruding upward from the extending end of the end wall 22 are provided. As shown in FIG. 8, an extending portion 9 a on the upper side of the back plate 11 protrudes from the upper side of the end wall 22 of the grip block 50 while being gently curved rearward. Further, as shown in FIG. 8, the edge of the cushion material 12 and the tension member 13 that covers the front side of the back plate 11 is folded and arranged on the back surface side of the extending portion 9a on the upper side of the back plate 11. ing. In this embodiment, the upper portion of the extension portion 9 a on the upper side of the back plate 11, the cushion material 12 covering the extension portion 9 a, and the edge of the tension member 13 are continuous with the back support surface of the backrest portion 6. A wall 25 is formed.
In this embodiment, the upper edge of the backrest 6 is constituted by the upper wall 25 and the grip block 50 of the cover member 14.

  An opening 26 that opens toward the rear side is formed between the upper wall 25 and the end wall 22 disposed below the upper wall 25. A plurality of fastening holes 27 penetrating in the vertical direction are formed at a substantially central position in the backrest width direction of the end wall 22 of the grip block 50. A hanger unit 48 is fastened and fixed to the fastening hole 27 portion. In this embodiment, the fastening hole 27 at the approximate center in the backrest width direction and the peripheral area of the end wall 22 constitute an attachment portion for the additional functional component.

The hanger unit 48 includes a main body block 30 including a hanger 28 and a holder 29, and a clamping block 31 that is fastened and fixed to the end wall 22 of the cover member 14 together with the main body block 30.
The hanger 28 is attached to the chair 1 and extends horizontally in the backrest width direction, the rod hanging portion 32 projecting downward from the center of the clothing hanging portion 32 in the extending direction, have.

  The holder 29 includes a guide tube portion 34 into which the rod portion 33 of the hanger 28 is inserted so that the rod portion 33 can be moved up and down, and the rod portion 33 when the rod portion 33 inserted into the guide tube portion 34 moves to the maximum ascending position. A locking mechanism (not shown) that is fixed to 34, a release button 35 that releases the fixing of the rod portion 33 by the locking mechanism, and a guide cylinder portion 34 that is connected to the upper portion of the grip block 50 on the cover member 14 side. And a fitting piece 36. The fitting piece 36 is provided with a fitting groove 45 that is fitted over the upper surface of the end wall 22 on the cover member 14 side, the rear surface of the downward piece 23, and the projecting piece 24 on the lower surface side. In addition, a bolt insertion hole 37 corresponding to the fastening hole 27 on the end wall 22 side is provided so as to face the fitting groove 45. Further, a nut 39 to which a tip end portion of a bolt 38 inserted through the bolt insertion hole 37 is screwed is fixed inside the fitting piece 36.

Here, the upper edge portion of the cover member 14 is surrounded by the rear surface of the upper portion of the general portion of the cover member 14, the lower surface of the end wall 22 of the grip block 50, and the front surface of the downward piece 23 of the grip block 50. Accordingly, a substantially U-shaped portion 40 is formed.
The sandwiching block 31 has an upper bulging portion 41 fitted into the substantially U-shaped portion 40 from the lower side, and a lower end of the downwardly facing piece 23 and the front surface of the holder 29 connected to the upper bulging portion 41. A locking projection 42 in contact therewith. A recess 43 is provided on the lower surface of the upper bulging portion 41, and a bolt insertion hole 44 is formed on the bottom surface side of the recess 43. A bolt 38 for fastening and fixing the hanger unit 48 to the upper part of the cover member 14 is inserted into the bolt insertion hole 44 from below.
Further, between the holder 29 and the sandwiching block 31 of the main body block 30, there is provided a positioning portion (not shown) that is positioned by fitting with an unevenness.

  By the way, the hanger unit 48 has the fitting piece 36 of the holder 29 superimposed on the upper surface of the end wall 22 on the cover member 14 side and fixed to the end wall 22, but the upper edge of the backrest 6. The upper wall 25 and the end wall 22 arranged in the section are arranged so that when the hanger unit 48 is attached to the end wall 22, the upper wall 25 is separated from the hanger unit 48 (not in contact). ) Is formed.

Actually, when the hanger unit 48 is attached to the upper back side of the backrest 6, the front end of the fitting piece 36 of the main body block 30 is connected to the upper wall 25 and the end wall 22 from the rear side of the backrest 6. The fitting groove 36 of the fitting piece 36 is fitted into the upper surface of the end wall 22, the rear surface of the downward piece 23, and the protruding piece 24. Next, from this state, the upper bulging portion 41 of the sandwiching block 31 is fitted to the substantially U-shaped portion 40 below the end wall 22 from the lower side, and the locking projection 42 of the sandwiching block 31 is moved downward. The lower end of the main body block 30 is brought into contact with the front surface of the guide tube portion 34 of the main body block 30. At this time, the main body block 30 and the sandwiching block 31 are positioned relative to each other by the positioning portion 49. In this state, the tip of the bolt 38 is inserted into the bolt insertion hole 44, the fastening hole 27 of the end wall 22, and the bolt insertion hole 37 of the main body block 30 from the lower side of the clamping block 31. The part is tightened into the nut 39 in the main body block 30. As a result, in a state where the main body block 30 and the sandwiching block 31 are stacked on the upper and lower sides of the end wall 22, the three members are integrally fastened and fixed.
As a result, the hanger unit 48 is attached to the end wall 22 on the cover member 14 in a non-contact state with the upper wall 25 of the backrest 6.

As described above, in the chair 1 according to this embodiment, the end wall 22 of the grip block 50 on the cover member 14 side is the opening 26 below the upper wall 25 continuous with the back support surface of the backrest 6. Since the hanger unit 48 is fastened and fixed to the end wall 22 of the gripping block 50, the dimension of the mounting portion of the hanger unit 48 in the front-rear direction is shortened. As a result, the chair 1 Even when the hanger unit 48 is directly gripped due to movement or the like, a large moment is unlikely to be generated in the attachment portion of the hanger unit 48. Further, in the chair 1, the hanger unit 48 is fastened and fixed to the end wall 22 so as not to be in contact with the upper wall 25. The feeling of the mounting portion of the unit 48 is not easily transmitted to the seated person through the upper wall 25. Therefore, in the chair 1, the sitting comfort of the seated person is good.
Note that the hanger unit 48 (additional functional component) does not necessarily need to be in non-contact with the upper wall 25, and the hanger unit 48 may not be attached within the range of the upper wall 25 in the thickness direction.

  Moreover, in the chair 1 of this embodiment, the downward piece 23 which protrudes below is extended in the lower surface side of the edge part wall 22 of the holding block 50, and the hanger unit 48 has the upper surface of the edge part wall 22, and the rear surface of the downward piece 23 Since it is fastened and fixed to the end wall 22 in a state of being fitted to the hanger unit 48, the mounting strength of the hanger unit 48 is increased. In particular, in the case of this embodiment, since the protruding piece 24 that protrudes from the upper surface side of the end wall 22 and is fitted into the fitting groove 45 is extended, the hanger unit 48 is stably supported by the grip block 50. Can be made.

Furthermore, in the chair 1 of this embodiment, the lower surface of the end wall 22 of the grip block 50 is surrounded by the rear surface of the general portion of the cover member 14, the lower surface of the end wall 22, and the inner surface of the downward piece 23. Since the substantially U-shaped portion 40 is provided and the sandwiching block 31 is fitted into the substantially U-shaped portion 40, the main body block 30 and the sandwiching block 31 are disposed above the end wall 22. The end wall 22 can be fastened and fixed in a state of being fitted to the side and the lower side. Therefore, the hanger unit 48 can be stably and firmly fixed to the end wall 22, and the rigidity of the end wall 22 itself is enhanced by the main body block 30 and the sandwiching block 31, and the hanger unit 48. It is possible to more rigidly receive the moment acting from.
The clamping block 31 is not necessarily provided, and the fitting piece 36 of the main body block 30 may be fastened and fixed to the end wall alone.

  In this embodiment, the body block 30 and the sandwiching block 31 of the hanger unit 48 are provided with positioning portions 49 that contact each other, so that the body block 30 and the sandwiching block 31 are positioned before fastening with the bolt 38. By positioning each other by the portion 49, the main body block 30, the end wall 22 and the clamping block 31 can be accurately positioned to facilitate the insertion of the bolt 38. Therefore, the fastening operation can be performed smoothly.

  Further, in this embodiment, the downward piece 23 is provided so as to protrude downward from the protruding end on the rear side of the end wall 22, and there is no portion protruding backward from the downward piece 23. The hanger unit 48 can be easily engaged. Therefore, the mounting workability of the hanger unit 48 is improved.

In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above-described embodiment, the main body block of the hanger unit, which is an additional functional component, is fitted from the upper side to the upper surface of the end wall (lower wall) and the outer surface of the downward piece, and the sandwiching block is the end wall (lower portion). The structure is fitted to the U-shaped part from below the wall), but conversely, the clamping block is fitted to the upper surface of the end wall (lower wall) and the outer surface of the downward piece from above. The main body block may be fitted into the substantially U-shaped portion from below the end wall (lower wall).
Moreover, although said embodiment is embodiment which an additional functional component is a hanger unit, additional functional components may be other things, such as not only a hanger unit but a headrest.

4 Seat 6 Backrest 9 Backrest Support Frame (Backrest Support)
10 Backrest body 22 End wall (lower wall)
23 downward facing piece 25 upper wall 26 opening 27 fastening hole (attachment part)
30 Body block (Part body block)
31 Holding block 48 Hanger unit (additional functional parts)

Claims (5)

The backrest portion includes a backrest support body connected to a chair body portion including a seat body, and a backrest body supported by the backrest support body,
In the chair in which the upper edge of the backrest that has stood up from the lower end extends toward the rear side, and the attachment portion of the additional functional component is provided on the upper back side of the backrest,
An opening having an upper wall continuous to the back support surface side of the backrest and a lower wall disposed below the upper wall is provided at an upper edge of the backrest.
A chair characterized in that the mounting portion is provided on the lower wall. A downward piece projecting downward extends on the lower surface of the lower wall,
The additional functional component is fastened and fixed to the attachment portion in a state where the additional functional component is fitted to the upper surface of the lower wall and the outer surface of the downward piece. Chairs. Below the lower wall, a substantially U-shaped portion surrounded by a lower surface of the lower wall and an inner surface of the downward piece is provided,
The additional functional component includes a component main body block that is fitted to the upper surface of the lower wall and the outer surface of the downward piece, and a clamping block that is fitted from below into the substantially U-shaped portion,
The component main body block and the clamping block are a state in which the component main body block is fitted to the upper surface of the lower wall and the outer side surface of the downward piece, and the clamping block is fitted in the substantially U-shaped portion. The chair according to claim 2, wherein the mounting portion is sandwiched between and fastened to each other.   The chair according to claim 3, wherein the component main body block and the clamping block are provided with positioning portions that contact each other.   The chair according to any one of claims 2 to 4, wherein the downward piece protrudes downward from an extending end of the lower wall.

Images