JP4295267B2 - Chair armrest mounting structure - Google Patents

Description

  The present invention relates to a chair armrest mounting structure.

As a conventional armrest mounting structure, there is a structure in which the upper part of the rear leg of the leg is extended upward from both sides of the seat, and the rear end of the armrest is attached to the upper end thereof (see, for example, Patent Documents 1 and 2). .
JP 2002-125798 A JP 2005-65764 A

  As described in Patent Documents 1 and 2 above, when the upper part of the rear leg is extended above the seat and the armrest is attached to the upper end thereof, the upper end of the rear leg is made into a shape suitable for attachment of the armrest. Therefore, the leg body including the rear leg cannot be shared with a chair without an armrest. Therefore, it is necessary to produce two types of legs with a chair with an armrest and a chair without it, which increases costs.

  In order to deal with this problem, it is possible to attach armrests to both sides of the backrest and to share the legs even in a chair without armrests, but in this way, how to attach the armrests to the backrest And strength problems occur.

  The present invention has been made in view of the above problems, and allows an armrest to be easily and firmly attached to the side of the backrest, and allows a leg or the like to be shared even in a chair without an armrest. An object of the present invention is to provide an armrest mounting structure for a chair.

According to the present invention, the above problem is solved as follows.
(1) Fit the lower ends of the left and right sides of the backrest to the upper ends of a pair of backrest support rods that are attached to the legs with the upper ends on the rear sides of the seat. A downward mounting portion connected to the rear end of the armrest facing forward is fitted into a vertical groove provided on both side surfaces of the lower portion of the droop, and this downward mounting portion, the backrest, and its Armrests are attached to both sides of the lower part of the backrest by fastening the backrest support heel fitted to the lower end with screws.

(2) In the above item (1), a plurality of upper and lower protrusions are provided on the inner surface of the downward mounting portion of the armrest, and a concave hole into which the protrusion is fitted is formed on the inner surface of the concave groove on the backrest. Provide.

(3) In the above item (1) or (2), a shaft-shaped support portion facing in the left-right direction is provided at the upper end of the back support rod, and a mounting rod having a female screw hole facing in the left-right direction is provided on the upper end. The lower end of the backrest is fitted into this mounting rod, and the bolt inserted from the outside of the downward mounting portion of the armrest is screwed into the female screw hole of the mounting rod, so that the backrest and the mounting rod Tighten the armrest and the downward mounting part together.

(4) In the above item (3), a concave groove that is recessed inward is provided on the outer surface of the downward mounting portion, and a bolt is inserted into the inner surface of the concave groove and its head is fitted. A stepped hole is drilled.

(5) In the above item (3) or (4), an upward arc-shaped fitting recess is formed at the lower end of the downward mounting portion of the armrest, and this fitting recess is fitted to the upper surface of the shaft-like support portion. To do.

According to the first aspect of the present invention, the armrest is screwed into the backrest and the backrest support rod fitted thereto with the downward mounting portion fitted into the concave groove on the side surface of the backrest. Since they are fastened together, there is no fear of wobbling in the front-rear direction, and the armrest is substantially fixed integrally with the backrest support rod, so that it can be firmly attached.
In addition, since the armrest is attached to the side of the backrest with a screw, it is very easy to attach, and even in a chair without an armrest, the leg body and the backrest support attachment attached to it can be shared, and the cost Is reduced.

  According to the second aspect of the present invention, by fitting the protrusion into the concave hole, the armrest can be easily positioned and attached to the backrest, and the armrest is surely wobbled in the vertical and longitudinal directions. And can be attached more firmly.

  According to the invention described in claim 3, from the outside of the downward mounting portion of the armrest, only the bolt is screwed into the female screw hole of the mounting rod fitted to the lower end portion of the backrest, so that the armrest is Since it can be easily attached to the side surface of the flange, and the tip end portion of the bolt is screwed into the female screw hole of the attachment rod and is not exposed to the outside, the appearance is improved.

  In addition, since the mounting rod is erected on the upper end of the shaft-shaped support part that faces in the left-right direction, by shifting the erected position in the left-right direction, the left-right dimension of the backrest and the left-right position of the armrest attached to it Etc. can be changed.

  According to invention of Claim 4, since the head part of a volt | bolt is not exposed to the outward of an armrest, appearance improves.

  According to the invention of claim 5, since the fitting recess at the lower end of the downward mounting portion of the armrest is fitted to the upper surface of the shaft-shaped support portion, there is no fear that the lower end of the armrest wobbles in the front-rear direction. In addition, since the backrest support heel and the armrest continuously exhibit a sense of unity, the appearance after mounting the armrest is improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a front view of a chair to which the present invention is applied, FIG. 2 is a side view, FIG. 3 is a front perspective view, and FIG. 4 is an enlarged front view of a backrest.

  The chair (1) is composed of a leg (4) having five leg rods (3) facing the radial direction with a caster (2) attached to the tip, and a gas which is erected at the center and contained in the leg. A leg column (5) that can be expanded and contracted by a spring (not shown) and a support base (6) fixed to the upper end of the leg column (5) are provided.

  A seat support frame (7) facing diagonally forward and upward is integrally connected to the front end of the support base (6), and on both sides of the support base (6) slightly behind the pedestal (5). As shown in FIG. 5 (only one is shown because it is bilaterally symmetrical), a pair of left and right backrests are formed in a generally forward-shaped shape when viewed from the side, and the lower end is bent in an inward L shape. The hooks (8) and (8) are pivoted to the rubber torsion unit (not shown) provided inside the support base (6) by pivotally fitting the pivot portion (8a) at the inner end of the inward bent portion. It is attached so as to be able to rotate in the front-rear direction in a state where an urging force is applied.

  The upper surface of the front end portion of the seat support frame (7) supports both the left and right sides of the lower surface of the front end portion of the seat plate (10), in which the cushion member (9) is stretched on the upper surface, so as to be movable in the front-rear direction. Has been. The left and right side portions of the rear end portion of the seat plate (10) are pivotally attached to the upper ends of the left and right backrest support rods (8) as follows. That is, a pair of left and right support pieces (11) and (11) are erected on the upper end edge of the rear end portion of the seat plate (10), and countersunk screws (12a) are provided on the outer surfaces of the both support pieces (11). As shown in FIG. 5, the upper ends of the pair of seat support brackets (12) fixed by the inner side of the shaft-like support portion (13) facing the left-right direction fixed to the upper end of the backrest support rod (8) By loosely fitting to the inwardly facing angular axis (13a) protruding from the side, the left and right sides of the rear end of the seat plate (10) are tilted backward by the upper ends of the left and right backrest support rods (8). Supported as possible.

  In the inner end of the angular shaft (13a), a rectangular hole (14a) at the lower end of the back frame mounting rod (14) that supports the lower end of the backrest (19), which will be described later, faces in the vertical direction ( 14b) is fitted to the seat support bracket (12) through the plain washer (15) and the two-part structure bush (16) (16) so that they cannot be rotated relative to each other. The bolt (17) inserted from the outside of the support part (13) is fixed by screwing into the internal thread (not shown) inside the shaft-like part (14a) through the square shaft (13a). Yes.

  (18) and (18) are caps fastened to the opening on the outer surface of the shaft-shaped support portion (13) and the opening on the inner surface of the shaft-shaped portion (14a) of the back frame mounting rod (14), respectively. The head and the tip of the bolt (17) are blindfolded.

  (19) is a plate-like backrest, which consists of a back frame (20) that forms a substantially rectangular frame when viewed from the front, and an inner back plate (21) surrounded by the back frame (21). Molded.

  As shown in FIG. 4, the lower portions of the left and right side frames (20a) and (20a) of the back frame (20) are slightly expanded outward, and the lower end portion is connected to the back support rod (8). Mounting portions (20c) and (20c) are continuously provided downward.

  The side frame (20a) has a plate shape continuous with the back plate (21), and its front-rear dimension (thickness) has a large lower end as shown in the side view of FIG. 2 and the cross-sectional view of FIG. It is formed so as to gradually become smaller toward the upper end, and its cross-sectional shape is an outward U-shape as seen in a plan view as shown in FIGS. 8 and 9, and the outer surface is open outward and downward. A concave groove (22) is formed to the vicinity of the upper end in the vertical direction.

  The opposing surfaces except for the lower end of the concave groove (22) are connected at regular intervals by a plurality of substantially flat plate-like ribs (23), and the side frame (20a) is bent in the front-rear direction. Increases rigidity.

  The lower frame (20b) curved in an arc shape at the lower end of the back frame (20) has a plate shape continuous with the back plate (21), and its cross-sectional shape is a downward-looking side view as shown in FIG. The opposing surfaces of the concave groove (24) formed in the lower surface and formed in the lower surface are connected to each other by a large number of flat plate-like ribs (25), and the bending rigidity of the lower frame (20b) Is increasing.

  Two stepped holes (26) through which bolts for mounting armrests (29), which will be described later, are inserted into the rear surface of the mounting portion (20c) at the lower end of the side frame (20a) and the concave groove (22) thereabove (26) is formed (see FIG. 5).

  As shown in FIG. 7, the thickness (front-rear dimension) of the back plate (21) is large at the lower side, and gradually decreases toward the upper end, as with the side frame (20a), and as shown in FIG. Furthermore, both sides are large and formed so as to gradually become smaller toward the center.

  On the entire surface of the back plate (21), a large number of vertically slit-like openings (27) are formed in a regular arrangement at regular intervals in the vertical and horizontal directions. That is, the left and right openings (27) adjacent to each other are perforated in the form of a staggered pattern in the left-right direction in a manner in which the vertical positions are alternately changed by approximately half the vertical dimension, and The openings (27) are formed in a straight line so as to be close to each other.

  As shown in FIG. 10 in an enlarged manner, the thickness (front-rear dimension) of the connecting piece (21a) which is vertically continuous between the openings (27) adjacent to each other on the left and right in the back plate (21) is In addition, the cross-sectional shape is a rib shape which is larger than the left-right dimension and is long in the front-rear direction.

  Further, as shown in FIG. 9, the thickness (front-rear dimension) of the connecting piece (21b) between the openings (27) arranged in the vertical direction is made smaller than the thickness of the connecting piece (21a) adjacent to the left and right. The cross-sectional shape of the portion is a substantially U-shaped cross-section in a plan view with the center of the rear surface being thin.

  With such a cross-sectional shape, when a backward pressing load is applied to the back plate (21), the rear surface side of a large number of connecting pieces (21b) expands outwardly, and the entire back plate (21) It is easy to bend in the shape of a convex curved surface around the opening (27) arranged in the vertical direction, and has sufficient rigidity for the rear perpendicular to the opening (27) arranged in the left-right direction, making it difficult to bend.

  Further, since the connecting piece (21a) between the left and right openings (27) has a substantially rectangular cross section that is long in the front-rear direction, there is no possibility that the strength of the back plate (21) will decrease.

  As shown in FIG. 11, at the lower end of the left and right side frames (20a) of the back frame (20) (only one is shown because it is symmetrical and has the same structure), the back frame mounting rod (14) and the auxiliary frame are complemented. A mounting hole (28) having a rectangular cross-section with an opening at the lower end is formed in the vertical direction. The mounting hole (28) has a prismatic shape attached to the upper end of the backrest support rod (8) described above. The back frame mounting rod (14) is properly fitted and fixed together with the armrest (29) as follows.

  As shown in FIG. 5, the downward mounting attached to the inner end of the armrest (29) in the groove (22) formed on the outer surface of the lower end of the side frame (20 a) of the back frame (20). The bolt (29a) is fitted and bolts inserted from the outside into the two upper and lower stepped holes (31) formed in the back surface of the outer groove (30) in the downward mounting portion (29a) ( 32) is attached to the mounting hole (28) at the lower end of the side frame (20a) via the two upper and lower stepped holes (26) on the back surface of the concave groove (22). ) Are screwed into the two upper and lower female screw holes (33) and (33) facing in the left-right direction and tightened.

  As a result, the back frame mounting rod (14) attached to the backrest supporting rod (8), the side frame (20a) of the back frame (20), and the armrest (29) have two upper ends at the back of the seat. On both sides, the upper and lower sides of the backrest are fitted to the upper ends of a pair of backrest support ridges attached to the legs facing upward, and the lower ends on both the left and right sides of the backrest are fitted on the lower sides of the backrest. The downward mounting portion connected to the rear end of the armrest facing forward is fitted into the concave groove facing toward the front, and this downward mounting portion, the backrest, and the backrest supporting collar fitted to the lower end portion thereof Are fastened together with screws (32) with armrests attached to both lower side surfaces of the backrest. Particularly, since the downward mounting portion (29a) of the armrest (29) is fitted and fixed in the concave groove (22) of the side frame (20a), it does not wobble in the front-rear and vertical directions.

  As shown in FIG. 11, the insertion portion of the bolt (32) on the inner surface of the downward mounting portion (29a) of the armrest (29) has an outer side of the stepped hole (26) of the side frame (20a). A protrusion (34) fitted into the large-diameter recessed hole protrudes to facilitate positioning when attached to the side frame (20a).

  Further, at the lower ends of the downward mounting portion (29a) and the side frame (20a), as shown in FIG. 5, the upper surface of the shaft-like support portion (13) at the upper end of the backrest support rod (8) and the back frame are provided. An upward arcuate fitting recess (35) (35) that fits on the upper surface of the shaft (14a) of the mounting rod (14) is formed, and the backrest (19) When the lower end of the armrest (29) is attached, it is prevented from being displaced in the front-rear direction or wobbling, and the appearance after installation is improved.

  The head of the bolt (32) is located inside the large diameter part outside the stepped hole (31) on the back surface of the recessed groove (30) of the downward mounting part (29a), and is exposed outside the armrest (29). It is supposed not to.

  As described above, in the above embodiment, the back frame (20) of the backrest (19) has a relatively thin plate shape that is continuous with the back plate (21), and thus has a sense of unity with each other. , Improve the appearance.

  Further, the side frame (20a) and the lower frame (20b) of the back frame (20) each have an outward U-shaped cross section, and the opposing surfaces of the concave grooves (22) (24) formed on the outer surface and the lower surface Are connected by a large number of plate-like ribs (23) and (25), so that the bending rigidity in the front-rear direction is high despite the back frame (20) being plate-like, and the back of the seated person When the backrest (19) is pressed rearward by the load, only the backboard (21) is effectively bent rearward, so that the sitting comfort is improved.

  Furthermore, the back and forth dimensions (plate thickness) of the side frame (20a) and back plate (21) of the back frame (20) are gradually reduced toward the upper end, so the backrest (19) is strongly pressed. When it is done, the upper part of the back frame (20) with increased rigidity bends to the rear moderately, and the upper part of the back plate (21) is also easily bent to the rear, making it possible to comfortably support the upper part of the back in particular. . Moreover, since the front and rear dimensions of the entire back plate (21) including the connecting piece (21a) are gradually reduced from both sides toward the center, the center portion of the back plate (21) to which the back pressing force is most greatly applied is reduced. The bending rigidity is reduced, and it becomes easy to bend greatly backward, so that the entire back as well as the center part of the back is comfortably supported.

  Furthermore, on the entire surface of the back plate (21), a large number of openings (27) arranged in the vertical direction are formed, and the center of the rear surface of the connecting piece (21b) between the upper and lower openings (27) is thinned. Because the part is easy to expand rearward, the back plate (21) as a whole is bent back and convex around the many openings (27) facing upward and downward, and it fits the entire back, making it comfortable A comfortable sitting experience.

  Since the connecting piece (21a) that is continuous in the vertical direction between the openings (27) adjacent to the left and right is a rib-shaped cross-sectional shape that is longer in the front-rear direction than the left-right dimension, the back plate (21) The bending rigidity in the front-rear direction orthogonal to the width direction is increased. Therefore, the strength of the back plate (21) does not decrease despite the large number of openings (27).

The present invention is not limited to the above embodiment.
In the above embodiment, the openings (27) adjacent to the left and right sides of the back plate (21) are drilled at different vertical positions in a staggered pattern in the left-right direction. Drilling may be performed by aligning the upper and lower ends in the left-right direction. Further, the openings (27) having different vertical dimensions may be combined and arranged as appropriate.

  The present invention can also be applied to a simple chair as described in Patent Documents 1 and 2 described above. At this time, a backrest supporting rod that faces upward is fixed to the upper ends of the pair of left and right rear legs that form a part of the leg, and the back frame mounting rod that is erected on the upper end is similar to the above embodiment. The backrest (19) is attached to (14), and the armrest (29) may be fastened together with a bolt.

  Further, if the upper end portion of the backrest support rod (8) has a shape that can be fitted into the mounting hole (28) of the side frame (20a), the back frame (20 ) Can also be attached directly.

  When removing the armrest (29), insert a slightly shorter bolt (32) from the stepped hole (26) of the side frame (20a) and the female screw hole of the back frame mounting rod (14). (33) may be screwed directly. Thereby, a backrest support ridge (8) etc. can be made common even in a chair without an armrest.

It is a front view of the chair to which this invention is applied. It is a side view similarly. It is a front perspective view similarly. Similarly, it is an enlarged front view of a backrest. Similarly, it is a disassembled perspective view of the attachment part of a backrest and an armrest. It is the VI-VI line expansion vertical side view of FIG. Similarly, it is a VII-VII line enlarged vertical side view. Similarly, it is an VIII-VIII line enlarged transverse plan view. Similarly, it is an IX-IX line enlarged transverse plan view. It is a partial enlarged front view of a back board. FIG. 2 is an enlarged cross-sectional plan view taken along line XI-XI in FIG. 1.

Explanation of symbols

(1) Chair
(2) Casters
(3) Footpad
(4) Leg
(5) Pillar
(6) Support base
(7) Seat support frame
(8) Back support
(8a) Axis
(9) Cushion material
(10) Seat plate
(11) Support piece
(12) Seat support bracket
(12a) Countersunk screw
(13) Shaft support
(13a) Square axis
(14) Back frame mounting rod
(14a) Shaft-shaped part
(14b) Square hole
(15) Plain washer
(16) Bush
(17) Bolt
(18) Cap
(19) Backrest
(20) Back frame
(20a) Side frame
(20b) Bottom frame
(20c) Mounting part
(21) Backboard
(21a) (21b) Connecting piece
(22) Groove
(23) Rib
(24) Concave groove
(25) Rib
(26) Stepped hole
(27) Opening
(28) Mounting hole
(29) Armrest
(29a) Downward mounting part
(30) Concave groove
(31) Stepped hole
(32) Bolt
(33) Female thread hole
(34) Projection
(35) Mating recess

Claims (5)

  The lower ends of the left and right sides of the backrest are fitted to the upper ends of a pair of backrest support rods whose upper ends are attached to the legs facing upwards on both rear sides of the seat body, A downward mounting portion connected to the rear end of the armrest facing forward is fitted in a concave groove provided on both side surfaces and facing the vertical direction, and this downward mounting portion, the backrest, and a lower end portion thereof are fitted. An armrest mounting structure for a chair, wherein the armrests are attached to both side surfaces of the lower part of the backrest by fastening the fitted backrest support rods together with screws.   The chair according to claim 1, wherein a plurality of upper and lower protrusions are provided on the inner side surface of the downward mounting portion of the armrest, and a recessed hole into which the protrusion is fitted is provided on the inner surface of the recessed groove on the backrest. Armrest mounting structure.   A shaft-shaped support part that faces in the left-right direction is provided at the upper end of the backrest support collar, and a mounting saddle with a female screw hole facing in the left-right direction is erected on the upper end, and the lower end of the backrest is fitted into this mounting collar. The backrest, the mounting rod and the downward mounting portion of the armrest are fastened together by screwing a bolt inserted from the outside of the downward mounting portion of the armrest into the female screw hole of the mounting rod. 3. A chair armrest mounting structure according to 1 or 2.   A concave groove that is recessed inward is provided on the outer surface of the downward mounting portion, and a stepped hole is formed in the inner surface of the concave groove so that a bolt is inserted and the head is fitted. The armrest mounting structure for a chair according to claim 3. The armrest mounting of the chair of Claim 3 or 4 which forms an upward arc-shaped fitting recessed part in the lower end of the downward mounting part of an armrest, and fits this fitting recessed part on the upper surface of a shaft-shaped support part. Construction.

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