JP2013106693A - Chair with armrest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing structure of an armrest, which provides an excellent appearance while securing high support strength of the armrest, and can be applied to a rocking chair without trouble.SOLUTION: A back strut 13 is provided at the rear end of a back frame 8 connected to a base in such a manner as to be tiltable backward. A back outer shell 9 has a pocket portion 39 opened downward, the pocket portion 39 being fitted to an upper portion of the back strut 13. The back strut 13 includes an upper elbow attachment portion 35 located laterally outside, and a head 47a of an inward portion 47 of an elbow pad portion 20 in an armrest 19 is fitted to the upper elbow attachment portion 35 from the lateral direction. The head 47a of the armrest 19 is fixed to the upper elbow attachment portion 35 by a screw 52. Since the armrest 19 is fixed to the upper elbow attachment portion 35, it can be applied to a rocking chair without trouble while securing high support strength. Since the head 47a is hidden with the back outer shell 9, a beautiful appearance also can be secured.

Description

  The present invention relates to a chair provided with a fixed armrest.

  As a fixed armrest of a chair, there is one that has a U-shape or an inverted L-shape in a side view. As an example, there is Patent Literature 1. In Patent Literature 1, an armrest is fixed to an outer shell (outer cover). That is, the chair of Patent Document 1 includes a seat outer shell positioned below the seat and a back outer shell positioned behind the lower portion of the backrest, and the front support portion extending downwardly on the armrest is provided as the seat outer shell. It is fixed to the shell, and the back end of the armrest where the person's arm (elbow) is placed on the armrest is fixed to the front of the back outer shell with a screw.

CD-ROM of Japanese Utility Model Publication No. 05-34960

  In Patent Document 1, since the rear end of the elbow pad is inserted between the backrest and the back outer shell, the back surface of the back outer shell is refreshed and excellent in aesthetics. However, since Patent Document 1 is directed to a chair in which a back outer shell and a seat outer shell are connected in series, there is a problem in that it cannot be applied to a rocking chair whose backrest tilts backward and lacks versatility. In addition, since a person may put a lot of weight on the armrest, a considerable load may be applied to the fixing portion of the armrest. However, since the back outer shell is thin, in Patent Document 1, a high support strength is obtained. There is a possibility that the back outer shell must be thickened.

  The present invention has been made in view of such a situation, and an object thereof is to provide a chair with an armrest that is excellent in versatility and generality that can be applied to a rocking chair without hindrance, and that can secure strength and beauty. Is.

  The chair of the present invention includes a back frame attached to a seat or a base disposed below the seat, a back outer shell attached to the back frame, a backrest disposed in front of the back outer shell, and the back frame. An armrest attached to the armrest, and the armrest includes an armrest portion on which a seated person's elbow rests, and a front support portion extending substantially downward from a front end of the armrest portion, The basic structure is such that the lower end of the front support part and the rear end of the elbow rest part are fixed to the back frame.

  In this basic configuration, the invention according to claim 1 is that the back frame has a back support portion that is positioned on the front side of the back outer shell and rises upward, and the back outer portion includes the back outer portion. While the shell is attached, an inward portion that enters between the back support portion of the back frame and the back outer shell is provided at the rear end of the armrest portion of the armrest, and the inward portion of the armrest is It is fixed to the back support.

  According to the invention of claim 2, in the backrest 1, the back support portion of the back frame has left and right back struts protruding upward, and the inward portion of the armrest is fixed to the upper end portion of the back strut. Yes. A third aspect of the present invention is the first or second aspect of the present invention, wherein the upper end portion of the back support portion is formed with a concave portion in which a tip portion of the inward portion of the armrest is fitted from the side, and the inward direction of the armrest The inward portion of the armrest is fixed to the back support portion of the back frame by screwing a screw into the nut fitted into the portion from the front side.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, upper and lower side ribs against which the backrest hits are formed on the left and right sides of the front surface of the back outer shell, and the inner side of the side ribs. The back support portion of the back frame is disposed, and the portion into which the inward portion of the armrest is fitted among the side ribs in the back outer shell is formed as a weakened portion that can be cut off or folded back inside. Upper and lower sides of the weakened part are separated from other parts by slits.

  In the present invention, since the armrest is fixed to the back frame, it can be applied to a rocking chair without any problem. For this reason, it is excellent in versatility and generality, and high support strength can be secured. Moreover, since the inward part of the armrest is inserted between the back outer shell and the backrest, the aesthetic appearance is also excellent.

  The back support part of the back frame can adopt various forms, but if the left and right back struts projecting upward are provided as in claim 2, the support strength of the back outer shell can be increased without excessively increasing the back support part. It can be improved. In other words, to increase the support strength of the back outer shell, it is preferable to increase the height of the back support portion. However, increasing the height of the entire back support portion increases the amount of material (metal or resin) used and increases the weight. On the other hand, if a back strut is provided as in claim 2 of the present application and a back outer shell or armrest is attached thereto, the mounting strength of the back outer shell can be improved without excessively increasing the back support portion. is there.

  If the configuration of claim 3 is adopted, the inward portion of the armrest and the back support portion of the back frame are fitted to each other, so that the inward portion of the armrest is firmly against the back support portion of the back frame. Can be firmly fixed by fastening one screw. Further, since the inward portion of the armrest can be fitted into the recess of the back support portion from the side, the armrest can be fixed to the back support portion even when the back outer shell is attached to the back frame. For this reason, the armrest mounting operation can be performed quickly.

  When the side ribs are provided on the back outer shell as in the fourth aspect, the back outer shell can secure high strength even if it is thinned. In this case, in order to fix the armrest, the side rib of the back outer shell must be formed with a notch for the inward portion of the armrest to enter, but since the armrest is an optional item, the notch is formed If the back outer shell and the back outer shell in which the notched portion is not formed are manufactured separately, the processing cost increases and the labor of member management is also increased.

  In this respect, if the weakened portion is formed on the side rib as in claim 4, one type is sufficient for the back outer shell when the armrest is attached and when the armrest is not attached. Can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the chair which concerns on embodiment, (A) is the perspective view seen from this side, (B) is a side view. (A) is the perspective view which isolate | separated the backrest, (B) is the isolation | separation perspective view which shows the fixing means of the lower end part of an armrest. (A) is the isolation | separation perspective view of the main member of a chair, (B) is a perspective view of the back frame and back outer shell in the state which attached the armrest. (A) (C) is a perspective view of the lower end part of an armrest, (B) is a perspective view of the lower part of a back frame. (A) (B) is a principal part perspective view in the state where the inward part of the armrest was fixed, (C) is a separation perspective view of an armrest, a back frame, and a back column. (A) (B) is the isolation | separation perspective view of an armrest and a back support | pillar. It is a partial perspective view of a back outer shell.

  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 specify the direction, but the words on the front and rear and right and left are based on the person who is seated. The front view direction is the direction facing the seated person, and therefore the left and right in the front view are opposite to the left and right viewed from the seated person.

(1). Outline of chair First, an outline of a chair will be described mainly with reference to FIGS. This embodiment is applied to a swivel chair often used for office work or the like. As shown in FIG. It has a base 3, a seat 4 arranged on the base 3, and a backrest 5 on which a seated person can lean.

  An intermediate member (seat receiving member) 6 shown in FIG. 1B is disposed on the base 3, and a resin seat outer shell 7 is attached to the intermediate member 6. The seat 4 includes a resin seat inner shell (seat plate) and a seat cushion material arranged on the upper surface thereof, but since there is no direct relationship with the present application, the description thereof is omitted.

  As shown in FIG. 2, a back frame 8 is connected to the base 3 so as to be able to tilt backward, and a back outer shell 9 is attached to the back frame 8. As can be seen from FIG. 3, the back frame 8 includes left and right side arms 10 that extend substantially in the front-rear direction, a laterally long rear portion 11 that is integrally connected to the rear end thereof, and a back support that rises from the rear end of the rear portion 11. The back outer shell 9 is attached to the back strut portion 12.

  The back strut portion 11 stands up in a generally wide plate shape, and the back struts 13 projecting upward are integrally provided on the left and right sides thereof (the back strut 13 is also a part of the back support portion 12). Therefore, the back support portion 12 has an upwardly open U-shape having a base portion and left and right back struts 13). A John Into bar 14 is integrally connected to the middle part of the front and rear sides of the left and right side arms 9. For this reason, the back frame 8 has a sturdy structure.

  The chair according to the present embodiment is a synchro type in which the seat is tilted backward while rocking, and the connecting shaft 15 connected to the intermediate member 6 is integrally formed or welded to the joint bar 14. . As shown in FIG. 1A, the backrest 5 includes a resin back inner shell (back plate) 16 and a cushion 17 stretched on the front surface thereof. The cushion 17 is covered with a skin material 18 such as a cloth. It has been broken.

  The chair has fixed (not liftable) left and right armrests 19. The armrest 19 is made of resin or aluminum die cast, and has an elbow rest 20 on which an arm (elbow) of a seated person is placed, and a front support 21 that extends rearward and downward from the front end of the elbow rest 20. Yes. The lower end of the front support portion 21 is fixed to the side arm 9 of the back frame 8, and the rear end portion of the elbow rest 20 is fixed to the back column 13 of the back frame 8. This point will be described next.

(2). Fixing structure of front support portion to back frame First, the fixing structure of the front support portion 21 will be described mainly with reference to FIGS. As shown in FIG. 2 and FIG. 4, a lower elbow attachment portion 23 that is outwardly opened in a triangle in a side view (mountain shape) is formed in the front and rear intermediate portion of the side arm 10 that constitutes the back frame 8. A boss portion 24 at the lower end of the front support portion 21 of the armrest 19 is fitted into the lower elbow attachment portion 23. The lower portion of the front support portion 21 in the armrest 19 is a horizontal portion 21a bent inwardly in the left-right direction so as to face the side arm 10 of the back frame 8, and at the tip of the horizontal portion 21a is a substantially triangular shape in side view. A boss portion 24 is formed.

  The recess 25 of the lower elbow mounting portion 23 extends into the side arm 10. A protrusion 26 is formed on the upper surface of the boss portion 24, and a groove 27 into which the protrusion 26 is fitted is formed in the upper portion of the recess 25 in the lower elbow mounting portion 23.

  The lower part of the lower elbow mounting part 23 has a fastening part 28 projecting downward from a part located inside the tip, while the horizontal part 21a of the armrest 19 is located below the boss part 24. A bracket portion 29 that abuts the fastening portion 28 is integrally formed, and the bracket portion 29 is fixed to the fastening portion 28 with a screw 30. As shown in FIG. 4A, a nut insertion groove 31 that opens downward is formed in the fastening portion 28, and the screw 30 is screwed into a nut (not shown) inserted into the nut insertion groove 31. .

  On the lower side of the lower elbow mounting portion 23, a notch 32 that opens outward is formed. On the horizontal portion 21a of the armrest 19, a portion between the boss portion 24 and the bracket portion 29 is cut off. A protrusion (not shown) that fits into the notch 32 is formed. Moreover, the bracket 29 of the armrest 19 has a shape that is largely bent downward, and the head of the screw 30 is hidden in the inside.

(3) Relationship between the back frame and the back outer shell Prior to the description of the fixing structure of the elbow rest portion 20 to the back column 13, the relationship between the back support portion 12 and the back outer shell 9 is mainly shown in FIGS. , 5 will be described.

  For example, as shown in FIG. 5C, the back strut 13 has a substantially prismatic appearance, and a longitudinal groove 34 extending to the lower end of the back support portion 12 is formed in an inner portion of the front surface of the back strut 13. Is formed. Further, the upper end portion of the back column 13 is divided into left and right by an upward opening groove 36, and an outer part divided by the upward opening groove 36 is an upper elbow attaching portion for fixing the elbow rest 20 of the armrest 19. 35.

  On the other hand, for example, as shown in FIG. 3, vertical ribs 37 are formed on the left and right side portions of the back outer shell 9, and vertical ribs 38 are formed on the inner side of the side ribs 37. Therefore, the space between the side rib 37 and the middle rib 38 is a space opened forward. And the pocket part 39 opened downward was formed in the outer side of the middle rib 38, and the pocket part 39 was located inside the upward opening groove | channel 36 among the upper parts of the back support | pillar 13 (refer FIG. 6). From above. As a result, the back outer shell 9 is held so as not to move left and right with respect to the fitting portion 13a of the back column 13 so as to be unable to move forward and backward.

  In the space between the pocket portion 39 and the side rib 37, the upper elbow attaching portion 35 (and the back column 13) fits tightly. Further, the outer side plate 39 a (see FIG. 7) of the pocket portion 39 is fitted in the upward opening groove 36 between the back column 13 and the upper elbow attachment portion 35.

  The side ribs 37 are provided at portions located on the inner side by a certain amount from the side end of the back outer shell 9. In addition, left and right horizontally long upper ribs 40 are integrally connected to the upper ends of the side ribs 37, while left and right horizontally long lower ribs 41 are connected to the lower ends of the left and right side ribs 37, so that the lower ribs 41 and the upper ribs 40 are vertically elongated inner ribs 42. Are connected. The back inner shell 16 is in contact with the side ribs 37 and the upper ribs 40 (at least it is supported by the side ribs 37, and a gap may be provided between the upper ribs 40 and the back inner shell 16). . In addition, the back inner shell 16 is attached to the back outer shell 9 by a plurality of engaging means including claws and protrusions.

  As briefly shown in FIG. 3 (A), a lower stopper 43 having a bar portion connected to the front ends of the left and right side plates is projected forward at the left and right intermediate portions of the lower portion of the back outer shell 9. A lower stopper hole 44 into which the lower stopper 43 is fitted is formed in the back support portion 12 of the frame 8. The lower stopper 43 is elastically deformed to fit into the lower stopper hole 44. Once fitted, the lower stopper 43 is held so as not to be detached.

  Further, corner engagement claws 45 are provided at the left and right corner portions of the back outer shell 9, while corner engagement holes (not shown) in which the corner engagement claws 44 are fitted in the left and right rear corner portions of the back frame 8. ) Is formed. The corner engagement claw 45 is also hooked inside the corner engagement hole by being elastically deformed and then returning and deforming. The back outer shell 9 first fits the pocket portion 39 into the back support 13, then presses the lower portion against the back support portion 12, fits the lower stopper 43 into the lower stopper hole 44, and sets the corner engaging claw 44 to the corner. It is easily attached to the back frame 8 by the operation of fitting into the engagement hole.

(3). Fixing structure of the elbow rest portion to the back strut Next, the fixing structure of the elbow rest portion 20 to the back strut 13 will be described mainly based on FIGS. As shown in FIG. 6, the upper elbow attachment portion 35 of the back column 13 is formed with a recess 46 opened rearward and left and right outside, while the rear end portion of the elbow rest 20 in the armrest 19 is attached to the upper elbow attachment. It is a substantially horizontal inward portion 47 extending toward the portion 35, and a head 47 a provided at the tip of the inward portion 47 is fitted in the concave portion 46 of the upper elbow attachment portion 35. Note that the upper elbow attachment portion 35 is also a part of the back column 13.

  As shown in FIG. 6, a notch 48 is formed in the upper part of the front surface of the head 47 a, while a protrusion 49 in which the notch 47 is fitted is formed in the recess 46 of the back column 13. Further, the front surface of the head 47a of the back armrest 19 is formed with a copper trough-shaped fitting groove 50 that is cut open to the left and right, while the inner bottom surface of the recess 46 in the back column 13 is fitted to the inner bottom surface. A fitting step 51 that fits into the mating groove 50 is formed.

  The fitting groove 50 and the fitting step portion 51 have a large vertical width toward the left and right inner sides (the pocket portion 39 side). For this reason, when the head 47 is inserted into the recess 46 from the outside, the fitting groove 50 and the fitting step 51 are fitted to each other. Similarly, when the head 47 is inserted into the recess 46 from the outside, the notch 48 and the protrusion 49 are fitted together. Therefore, even when the back outer shell 9 is attached, the head 47 a of the armrest 19 can be fixed to the back column 13.

  The head 47 is fixed to the upper elbow mounting portion 35 with one screw (bolt) 52 inserted through the upper elbow mounting portion 35 from the front. For this reason, the upper elbow mounting portion 35 has a screw insertion hole 53 with a countersink hole (because the head of the screw does not protrude from the front surface of the upper elbow mounting portion 35, the back inner shell 16 is rearward due to body pressure. The back inner shell 16 does not hit the head of the screw 52 even if it sinks in.)

  Although it is possible to provide a female screw hole in the head 47 a of the armrest 19, in this embodiment, as shown in FIG. A screw 52 is screwed into a nut 55 inserted into the nut holding hole 54. For this reason, it is not necessary to perform tapping on the head 47a, and the labor of processing the armrest 19 can be reduced. Although the nut 55 is drawn in a rectangular shape, a hexagonal nut can also be used.

  The upper elbow attachment portion 35 of the back support portion 12 is disposed in a space between the side rib 37 and the middle rib 38 of the back outer shell 9. For this reason, in order to enable attachment of the armrest 19 to the upper elbow attachment portion 35, for example, as shown in FIG. 5C, the side rib 37 has a notch portion 56 into which the inward portion 47 of the armrest 19 is fitted. Is forming. As shown in FIG. 7, the side rib 37 is formed with a weakened portion 37 a divided by the upper and lower slits 57. The weakened portion 37 a is cut out or folded inward (folded) to form the cutout portion 56. Appears. As a folding method (folding method) of the weakened portion 37a, various methods can be employed, such as folding around the root, folding in two or three. In addition, the weakened part 37a can also be called the notch coating | coated part which can be excised or folded.

  For example, as shown in FIG. 5, the portion of the side rib 37 above the notch 56 and the pocket portion 39 are connected by an inclined rib 37a, and the upper end of the upper elbow mounting portion 35 overlaps the inclined rib 37a. Is set. Therefore, the upper end portion of the surface facing the upward opening groove 36 in the upper elbow attachment portion 35 is an inclined surface 35a that is cut obliquely. Providing the inclined ribs 37b in this manner has an advantage that the back struts 13 can be firmly held because the side ribs 37 are not easily tilted even if the notches 56 are provided.

  Although there is a specification that is not attached because it is an optional armrest 19-piece, in this case, the weakened portion 37a remains. Therefore, the aesthetic appearance is not impaired when the armrest 19 is not attached. In addition, it is also possible to make excision easier by thinning the base part of the weakened part 37a. It is also possible to form a thin portion instead of the slit 57.

(4). Others The present invention can be embodied in various ways other than the above embodiment. For example, as a means for fixing the inward portion with respect to the back support portion, it is possible to form a concave portion that opens only in the lateral direction in the upper portion of the back column, and to fit the tip portion of the inward portion into the concave portion. On the contrary, the fitting relationship between the tip portion of the inward portion and the upper end portion of the back support portion can be opposite to that of the embodiment. It is also possible to attach a pad material to the upper surface of the elbow rest.

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

DESCRIPTION OF SYMBOLS 5 Backrest 8 Back frame 9 Back outer shell 11 Rear part of back frame 12 Back support part of back frame 13 Back column which is a part of back support part 16 Back inner shell 19 Armrest 20 Elbow pad part 21 Front support part 23 Lower elbow Attachment part 35 Upper elbow attachment part which constitutes a part of the back column and the back support part 37 Side rib 37a Weakening part 38 Middle rib 39 Pocket part 46 Recessed part 52 Screw 47 Inward part 55 Nut 57 In order to form a part of the side rib as the weakening part Slit

Claims (4)

A back frame attached to a seat or a base disposed below the seat, a back outer shell attached to the back frame, a backrest disposed in front of the back outer shell, and an armrest attached to the back frame; The armrest includes an elbow rest portion on which a seated person's elbow rests, and a front support portion extending substantially downward from a front end of the elbow rest portion, and a lower end of the front support portion, The back end of the elbow rest is fixed to the back frame,
The back frame has a back support portion that is located on the front side of the back outer shell and rises upward, and the back outer shell is attached to the back support portion,
An inward portion that enters between the back support portion of the back frame and the back outer shell is provided at the rear end of the armrest portion of the armrest, and the inward portion of the armrest is fixed to the back support portion. Yes,
Chair with armrests. The back support portion of the back frame has left and right back struts protruding upward, and the inward portion of the armrest is fixed to the upper end portion of the back strut,
The chair with an armrest according to claim 1. The upper end portion of the back support portion is formed with a concave portion in which the tip portion of the inward portion of the armrest is fitted from the side, and a screw is screwed into the nut fitted into the inward portion of the armrest from the front side. And the inward portion of the armrest is fixed to the back support portion of the back frame,
A chair with an armrest according to claim 1 or 2. The left and right sides of the front surface of the back outer shell are formed with vertically long side ribs against which the back rests, and a back support portion of the back frame is disposed inside the side ribs. Of the side ribs, the part into which the inward part of the armrest is fitted is formed as a weakened part that can be excised or folded back inside, and the top and bottom of the weakened part are separated from other parts by slits,
The chair with an armrest as described in any one of Claims 1-3.

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