JP5873304B2 - Chair with armrests - Google Patents

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 circumstances, and aims to be applicable without hindrance to the locking chair is excellent in versatility and general and provides armrest chair to the strength and appearance can be ensured To do.

  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.

And in this basic structure, in the invention of claim 1, the back frame has a back support portion which is located on the front side of the back outer shell and rises upward. 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.
The invention according to claim 3, in claim 1 or 2, the upper portion of the back support portion, while the distal end portion of the inward portion is a recess to be fitted from the side of the armrest, of the armrest In the orientation portion, a nut into which a screw inserted from the front is screwed into the upper end portion of the back column is fitted, and the inward portion of the armrest is placed on the back support portion of the back frame by the screw and the nut. It is fixed.

  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, when the back strut is provided as in claim 2 and the back outer shell or the armrest is attached thereto , the attachment strength of the back outer shell can be improved without excessively increasing the back support portion. It is.

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 concave portion 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 notch is not formed are manufactured separately, the processing cost increases and the work of managing the member is also required.

  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, to use the word "longitudinal", "lateral" to identify the direction, the front and rear left and right wording is based on the person 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 which are widely used in office and the like, as shown in FIG. 1, the chair, the leg device 2 having a leg support post 1 and casters, fixed to the upper end of the leg support post 2 The base 3, the seat 4 disposed on the base 3, and the 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. Seat 4 is made of resin seat inner shell (seat plate), but has a seat cushion member arranged superimposed on the upper surface, so the description directly no relationship with the present application 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 understood from FIG. 3, the back frame 8, the left and right side arms 10 extending substantially longitudinal direction, a rear portion 11 of the left and right horizontally long led to integrally at its rear end, rises from the rear end of the rear portion 11 back The back outer shell 9 is attached to the back support portion 12.

Back support portion 12 is generally rises at wide plate-like state, to the left and right side portions upwardly back posts 13 protruding are formed integrally (the back posts 13 also be 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). The front and rear intermediate portion of the left and right side arms 9, John Into bars 14 are connected together. For this reason, the back frame 8 has a sturdy structure.

Incidentally, the chair of the present embodiment is a synchronous type seat when locking is Ko傾receding, to John Into bar 14, connecting shaft 15 connected to the intermediate member 6 is provided with integrally molded or welded ing. 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 the front support portion with respect to the back frame First, the fixing structure of the front support portion 21 will be described with reference mainly to FIGS. 2 and 4. 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.

A site located inside the tip of the lower surface of the lower elbow mounting portion 23, the fastening portion 28 while being downwardly projected, the horizontal-like portion 21a of the armrest 19, positioned below the boss portion 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. Figure 4 (A), the the fastening portion 28, downward nut insertion groove 31 is formed which opens in a nut inserted into the nut insertion groove 31 (not shown), bis 30 screwed It is.

On the lower side of the lower elbow mounting portion 23 , an outwardly opened notch 32 is formed, while in the horizontal portion 21a of the armrest 19 between the boss portion 24 and the bracket portion 29, 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 portion 20 of the armrest 19. 35.

On the other hand, for example, as shown in FIG. 3, the left and right side portions of the back outer shell 9 have vertical longitudinal side ribs 37 are formed, further, on the inside of the support Idlib 37 is formed with upper and lower longitudinal middle rib 38 . Thus, between the side ribs 37 and the middle rib 38 is forwardly turned open space. Then, on the outside of the middle rib 38, forms a pocket 39 which is open downward, the pocket portion 39, a fitting portion 13a that is located inside of the upward opening groove 36 of the upper back support post 13 (see 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 that it cannot 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. Further, while the upper end of the side ribs 37 which horizontally oblong Apparibu 40 are connected together, the lower end of the right and left side ribs 37 are connected is Roaribu 41 of the left and right horizontally, the Roaribu 41 and Apparibu 40, the upper and lower longitudinal inner They are connected by ribs 42. 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. Lower stopper 43 is adapted to fit into the lower stopper hole 44 is elastically deformed, once fitted maltodextrins, lower stopper 43 is held so as not to come out.

  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 mounting portion 35 of the back pillar 13, while the recess 46 which opens the rear right and left outside are formed, the rear end of the elbow portion 20 in the armrest 19, the upper elbow towards the mounting portion 35 has become substantially horizontal shaped inward portion 47 extending head 47a provided at the tip of the inward portion 47 has fitted in the recess 46 of the upper elbow mounting 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.)

It is also possible to provide the female screw hole in the head 47a of the armrest 19, in the present embodiment, as shown in FIG. 6 (B), the head portion 47, the nut holding hole 54 which is open at its distal end face formed 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. Therefore , in order to enable the armrest 19 to be attached 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. 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. When the weakened portion 37 a is cut or folded inward (folded) , the cutout portion is formed. 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 cut or folded.

For example, as shown in FIG. 5, of the side ribs 37, the part and the pocket portion 39 above the cutout portion 56 are connected by the inclined ribs 37a, the upper end of the upper elbow mounting portion 35 on the inclined rib 37a is It is set to overlap. Therefore, the upper end portion of the surface facing upward opening groove 36 of the upper elbow mounting portion 35 is an inclined surface 35a which is obliquely cut. 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.

Since the armrest 19 is an optional item, there is a specification that is not attached, but 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. Conversely, the fitting relationship between the front end 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 may be embodied in the 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, while the inward portion of the armrest is formed on the upper end portion of the back strut from the front side. A nut into which the inserted screw is screwed is fitted, and the inward portion of the armrest is fixed to the back support portion of the back frame by the screw and the nut .
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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