JP5632253B2 - Armrest mounting structure - Google Patents

Description

  The present invention relates to an armrest mounting structure.

  Many office chairs are provided with armrests to reduce the burden of office work. As this type of armrest mounting structure, the side surface of the base heel inclined forward from the lower part of the back frame is provided with convex portions and engaging holes in a plan view that are continuous in the vertical direction, and the armrest struts facing in the vertical direction A V-shaped concave groove and a pin-shaped protrusion that are continuous in the vertical direction are provided at the lower end of the arm, and the concave groove and the protrusion of the armrest strut are fitted into the convex part and the engagement hole of the back frame, and There is one in which an armrest and a back frame are fastened with bolts (see, for example, Patent Document 1).

JP 2004-121444 A

  The armrest mounting structure described in Patent Document 1 has a shearing stress generated in the armrest mounting portion when rattling occurs between the armrest strut and the back frame and a load by a seated person acts on the armrest. May increase.

  The present invention has been made in view of the above problems, and when rattling does not occur between the armrest mounting portion and the chair mounting portion, and the load applied by the seated person acts on the armrest. An object of the present invention is to provide an armrest mounting structure capable of reducing the shear stress generated in the armrest mounting portion.

According to the present invention, the above problem is solved as follows.
(1) A mounted portion of a chair to which an armrest located on the side of the seat is to be mounted, and the mounted portion provided in a widened portion of a component member that widens forward or rearward in plan view ; One of the mounting parts attached to the mounted part of the armrest is provided with a bifurcated fitting convex part, and the other is provided with a bifurcated fitting concave part. The width between the side surfaces is gradually narrowed toward the tip of the fitting convex portion, and the width between the inner side surfaces in the fitting concave portion is gradually narrowed toward the back of the fitting concave portion. In this manner, the pair of fitting projections and the recessed portion located between the pair of fitting projections are formed as protrusions located between the pair of fitting depressions and the pair of fitting depressions. The fitting portion and the fitted portion, and the fitting convex portion and the fitting concave portion are fitted together. From the armrest attachment structures fastened by fastening means.

  With such a configuration, the outer surface of the pair of bifurcated fitting projections on one of the chair mounting portion or the armrest mounting portion and the pair of bifurcated fittings on the other side Since the inner surface of the concave portion is tapered in the same direction, the fitting convex portion and the fitting concave portion abut on a wide area. Therefore, rattling does not occur between the armrest mounting portion and the chair mounting portion, and the shear stress generated at the armrest mounting portion is reduced when a load is applied to the armrest by a seated person. can do.

In addition, since the mounted portion of the chair is provided in the widened portion of the constituent member that widens forward or rearward in plan view, a load is applied by an armrest seat occupant located on the side of the seat. Since the horizontal distance between the portion and the attachment portion can be shortened, the bending moment acting on the armrest attachment portion can be reduced when a load by the seated person is applied to the armrest.

( 2 ) A fitting convex part divided into two is formed on either one of the attached part of the chair to which the armrest located on the side of the seat is attached and the attaching part attached to the attached part of the armrest. A fitting recess that is bifurcated on the other side, and the width between the outer surfaces of the fitting projection is made gradually narrower toward the tip of the fitting projection, and the fitting The width between the inner side surfaces of the mating recess is gradually narrower toward the back of the fitting recess, and the pair of fitting projections and the recessed portion located between the pair of fitting projections Are fitted into the pair of fitting recesses, and a protrusion located between the pair of fitting recesses, and the mounting portion and the mounted portion are connected to the fitting projection and the fitting recess. the direction of fitting and been made to fastening by the fastening means, or the distal end surface of the protrusion located between the fitting concave portion of said pair In addition, a screw hole is provided toward the base of the protrusion, a screw insertion hole is provided on the bottom surface of the recessed portion, and a screw that is passed through the screw insertion hole is screwed into the screw hole. It is set as the armrest attachment structure fastened to the to-be-attached part of the chair.

  With such a configuration, the screwing length of the screw that fastens the armrest attachment portion and the chair attachment portion can be increased, and the fastening force by the screw can be increased.

( 3 ) In the above item (1) or (2) , a collar portion that abuts on a portion of the chair around the attached portion is provided around the attachment portion of the armrest.

  With such a configuration, it is possible to prevent the fitting force between the armrest attachment portion and the chair attachment portion from becoming excessive.

  According to the present invention, the outer surface of the pair of fitting projections in either one of the armrest mounting portion and the chair mounting portion and the inner surface of the pair of fitting recesses in the other are the same. Since the taper shape is inclined in the direction, the fitting area between the fitting convex portion and the fitting concave portion is increased, and no rattling occurs between the armrest attachment portion and the chair attachment portion. The shear stress generated in the armrest attachment portion by the load of the seated person can be reduced.

Moreover, the form which provided the to-be-attached part of the said chair in the widened part of the structural member widened toward the front or back in planar view receives the load by the seated person of the armrest located in the side of a seat Since the horizontal distance between the portion and the attachment portion can be shortened, the bending moment acting on the armrest attachment portion can be reduced when a load by the seated person is applied to the armrest.
  In addition, a screw hole is provided from the front end surface of the protrusion located between the pair of fitting recesses toward the base of the protrusion, and a screw insertion hole is provided on the bottom surface of the recess. The configuration in which the armrest mounting portion is fastened to the chair mounting portion by screwing the threaded screw into the screw hole is the screw threading that fastens the armrest mounting portion and the chair mounting portion. The length can be increased and the fastening force by the screw can be increased.

It is a front view of the non-use state of an armchair provided with one embodiment of the present invention. Similarly, it is a side view. Similarly, it is a side view in a use state. Similarly, it is a side view when the backrest is tilted backward in the use state. It is an enlarged plan view which shows the attachment structure of the support base and armrest seen from the VV line in FIG. It is the expansion perspective view which looked at the attaching part of the armrest in FIG. 2, and the to-be-attached part of the support base from diagonally back. It is the VII-VII line expanded sectional view in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, this armchair-equipped chair includes a leg body 3 having five leg rods 2 having a radial shape with a caster 1 at the tip. In the center of the leg 3, an extendable leg 4 having a gas spring (not shown) is erected, and the rear part of the support base 5 facing forward is fixed to the upper end of the leg 4.

  The support base 5 is formed in a shallow dish shape (see FIG. 5) having a triangular shape in plan view that expands forward, and as shown in FIG. Further, as shown in FIG. 1, the support base 5 has an upward U shape when viewed from the front, and is open to the front. It is easy to insert a member, a tool, etc. from the front.

As shown in FIG. 2, the seat 6 includes a synthetic resin seat plate 7 and a cushion material 8 attached to the upper surface of the seat plate 7, and the front end both sides of the seat plate 7 are arranged on both front end sides of the support base 5. By pivoting with the pivots 9 facing left and right, the pivot 9 is rotated around the pivot 9 into a non-use position that tilts rearward and upward, and a use position that tilts horizontally or rearward as shown in FIG. It is possible to move. The rotation range is preferably about 15 degrees.
The seat 6 is always urged upward by the urging means 10 toward the non-use position.

  As shown in FIG. 2, on both sides of the rear part of the seat plate 7, the front part of the bent part at the front of the lower side of the backrest 11 is pivotally attached with a support shaft 12 facing in the left-right direction. As shown in FIG. 2 and FIG. 3, it can be rotated around the support shaft 12 between a standing position that faces substantially upward and a rearward tilt position as shown in FIG. 4. Note that the specific structure of the backrest 11 and the pivotally attached portion is not directly related to the present invention, and therefore detailed illustration and description thereof will be omitted.

As shown in FIG. 2, the rear portion of the support base 5 and the portion of the backrest 11 below the support shaft 12 are connected by an elastically extendable push rod 13 that faces in the front-rear direction.
When the seat 6 is rotated downward from the non-use position to the use position (see FIG. 3), the lower end portion of the backrest 11 is pushed rearward by the pushing rod 13 so that the backrest 11 is maintained in an upright state. Further, the backrest 11 can be tilted backward as shown in FIG. 4 against the elastic restoring force of the pusher 13 by the elastic contraction of the pusher 13.

  As shown in FIGS. 2 and 5, an armrest 14 is attached to the rear side of the pivot 9 of the both side surfaces 5 a in the front part where the support base 5 is expanded. As shown in FIG. 1, the armrest 14 includes an armrest strut 15 having an L-shape inwardly viewed from the front and extending upward from the outside of the seat 6 through the support base 5 and below the seat 6. The arm rest strut 15 is composed of a relatively soft arm rest member 16 fixed to the upper end of the arm rest strut 15.

  The portion of the armrest column 15 that stands up from the side of the seat 6 has a substantially triangular frame shape whose width in the front-rear direction gradually increases upward in a side view. The upper rear surface of the armrest strut 15 is inclined rearward and upward with a curved surface substantially similar to the front surface of the side of the backrest 11 in a side view.

  As shown in FIG. 6, an attachment portion 17 for attaching to the support base 5 is provided at the lower end of the armrest 14 facing the inward side of the armrest support column 15. A mounted portion 18 for mounting the mounting portion 17 of the armrest 14 is provided.

  The mounting portion 17 of the armrest 14 is provided with a pair of fitting convex portions 17a and 17b that are divided into two in the front-rear direction, and a recessed portion 17c is provided between the pair of fitting convex portions 17a and 17b. Is provided. The fitting convex portions 17a and 17b form a quadrangular prism whose tip is narrowed. The width between the upper and lower outer surfaces of the fitting convex portions 17a and 17b and the width between the front and rear outer surfaces gradually become narrower toward the tips of the fitting convex portions 17a and 17b. The side surface is tapered.

  The width between the front and rear inner surfaces of the recessed portion 17c located between the fitting convex portions 17a and 17b gradually becomes narrower toward the back, and the front and rear inner surfaces are the outer surfaces of the fitting convex portions 17a and 17b. It is the reverse taper shape opposite to. The recessed depth of the recessed portion 17c is shallower than the maximum projecting dimension of the fitting convex portions 17a and 17b.

  The width between the upper and lower and front and rear inner surfaces of the fitting recesses 18a and 18b gradually becomes narrower toward the back of the fitting recesses 18a and 18b, and the front and rear of the protrusion 22 positioned between the fitting recesses 18a and 18b. The width between the outer surfaces of the projections gradually becomes narrower toward the tip of the protrusion 22. The outer surface of the protrusion 22 has a reverse taper shape opposite to the inner surfaces of the fitting recesses 18a and 18b.

  As shown in FIG. 7, the protrusion dimension of the protrusion 22 is smaller than the maximum recess dimension of the recesses 18a and 18b. A screw hole 23 penetrating to the inner surface of the support base 5 is provided on the front end surface of the protrusion 22 toward the base of the protrusion 22.

  A concave portion 19 is provided on the lower side surface of the mounting portion 17 of the armrest strut 15, and a screw insertion hole 20 penetrating to the bottom surface of the concave portion 17 c is provided on the bottom surface of the concave portion 19. Further, around the attachment portion 17, a collar portion 24 that abuts on a peripheral portion of the attached portion 18 of the support base 5 is provided.

  When the mounting portion 17 of the armrest 14 is attached to the mounted portion 18 of the support base 5, the pair of fitting convex portions 17 a and 17 b and the recessed portion 17 c of the armrest column 15 are fitted to the pair of fittings of the support base 5. After fitting into the recesses 18 a, 18 b and the protrusion 22, the screw 21 passed from the counterbore 19 for the armrest 14 to the screw insertion hole 20 is screwed into the screw hole 23 in the protrusion 22 of the support base 5. By doing so, the attaching part 17 and the to-be-attached part 18 are fastened from the fitting direction of fitting part 17a, 17b and fitting recessed part 18a, 18b.

  In the non-use state shown in FIG. 2, the armchair configured as described above is lifted up by the urging force of the urging means 10 so that the seat 6 is tilted rearward upward. The backrest 11 is held in an upright position substantially facing upward by the extension of the push rod 13.

  When the user sits in this state, the seat 6 is rotated to the use position shown in FIG. 3 against the urging force of the urging means 10 by the load of the occupant, and the occupant can quickly and properly Can take a sitting posture.

  When the seated person leans back against the backrest 11 from the seating state shown in FIG. 3 and tilts the back backward, the backrest 10 is elastically contracted by the push rod 13 and the support shaft 12 is centered. It is rotated to a rearward tilt position as shown in FIG.

  When the seat occupant returns his back to the front, the backrest 11 is rotated forward about the support shaft 12 by the extension by the elastic restoring force of the push rod 13, and returned to the original standing position.

  When the seated person tries to stand up from the seating state shown in FIG. 3, the seat 6 is urged by the urging means 10 to turn upward toward the non-use position, and assists the seated person to stand up. Can do.

  In addition, a fitting convex part can be provided in the to-be-attached part 18 of the chair 5, and a fitting recessed part can also be provided in the attaching part 17 of the armrest 14. FIG. Moreover, the armrest 14 can be attached not only to the support base 5 but also to any constituent member such as a chair seat, a backrest or a backrest support heel. In this case, in order to attach the armrest 14 to a member that widens forward or rearward in plan view, it is preferable to attach it to the widened portion.

DESCRIPTION OF SYMBOLS 1 Caster 2 Leg rod 3 Leg 4 Leg column 5 Support base 5a Side surface 6 Seat 7 Seat plate 8 Cushion material 9 Axis 10 Energizing means 11 Backrest 12 Support shaft 13 Pushing rod 14 Armrest 15 Armrest strut 16 Elbow rest member 17 Fitting portion 17a, 17b Fitting convex portion 17c Recessed portion 18 Fitted portion 18a, 18b Fitting concave portion 19 Recessed portion 20 Screw insertion hole 21 Screw 22 Protruding portion 23 Screw hole 24 Collar portion

Claims (3)

A mounted portion of a chair to which an armrest located on the side of the seat is to be mounted, the mounted portion provided on a widened portion of a component member that widens forward or rearward in plan view, and the armrest One of the mounting parts to be attached to the mounted part is provided with a bifurcated fitting convex part, and similarly provided with a bifurcated fitting concave part between the outer surfaces of the fitting convex part. The width is made gradually narrower toward the tip of the fitting convex part, and the width between the inner side surfaces in the fitting concave part is made gradually narrower toward the back of the fitting concave part, The pair of fitting projections and the recessed portion located between the pair of fitting projections are fitted into the pair of fitting depressions and the projection located between the pair of fitting depressions. The mounting portion and the mounted portion from the fitting direction of the fitting convex portion and the fitting concave portion. Armrest attachment structure, characterized in that the fastening by the fastening means. A fitting convex part divided into two is provided on either one of the attached part of the chair to which the armrest located on the side of the seat is attached and the attaching part attached to the attached part of the armrest, On the other side, a bifurcated fitting concave portion is provided, and the width between the outer surfaces of the fitting convex portion is gradually narrowed toward the tip of the fitting convex portion, and the fitting concave portion The width between the inner side surfaces is gradually narrowed toward the back of the fitting recess, and the pair of fitting projections and the recesses located between the pair of fitting projections are A pair of fitting recesses and a protrusion located between the pair of fitting recesses are fitted, and the attachment portion and the attached portion are fitted to the fitting projection and the fitting recess. from case direction, it is one that fastening by the fastening means, from the distal end surface of the projection located between the fitting recess of the pair, projection A screw hole is provided toward the base, and a screw insertion hole is provided on the bottom surface of the recessed portion located between the pair of fitting projections, and a screw passed through the screw insertion hole is screwed into the screw hole. Thus, the armrest mounting structure is characterized in that the armrest mounting portion is fastened to the mounted portion of the chair. The armrest attachment structure according to claim 1 or 2 , wherein a flange portion is provided around the attachment portion of the armrest so as to contact a portion of the chair around the attachment portion.

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