JP2005073872A - Chair with armrest device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the supporting strength of an armrest device in a chair in which the armrest device is inclined backwards together with a backrest. <P>SOLUTION: To a base 9 of the chair, a pair of left and right swing arms 9 for supporting the backrest 4 are attached so as to be inclined backwards. The swing arms 9 are each provided with a backward part 13a and an erected part 13b. The armrest devices 5 are each provided with an arm pad part 5a, a supporting part 5b extended downwards from its front part, and a downward foot part 5d provided on the rear end of the arm pad part 5a. The supporting part 5b is fixed to the backward part 13a of the swing arm 13 and the foot part 13d is fixed to the erected part 13b through a bracket. Since the armrest device 5 and the swing arm 13 forms a loop form in the side face view, the armrest and the swing arm reinforce each other and a strong structure is attained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a chair with an armrest device.

  When an armrest device is provided on a chair whose backrest tilts backward, in general, the chair is often fixed to the lower surface of the seat plate with screws. However, in this case, when the backrest tilts backward, the distance between the backrest and the armrest device is widened, which may cause the seated person to feel uncomfortable at the time of rocking.

  On the other hand, the armrest device is attached to the base so that it can be tilted backward, and the backrest is attached to the armrest device in part, but this does not allow the back tilt angle of the backrest to be increased so much that the locking function is In addition to being low, there is a problem in that it cannot be applied to a so-called synchro chair because the seat cannot be tilted backward (and retracted) in conjunction with the backward tilt of the backrest.

  In addition, the armrest device is often attached or not as an option of the user, but there is also a problem that a chair of the type without an armrest device in which a backrest is attached to the armrest device cannot be arranged.

On the other hand, the applicant of the present application disclosed in Patent Document 1 that the armrest device is detachably attached to the swing arm in a chair in which the backrest is attached to the swing arm attached to the base so as to freely tilt backward. .
JP 2002-172040 A

  According to the configuration of Patent Document 1, since the armrest device is additionally provided on the rocking chair, the locking function is not impaired by providing the armrest device. In addition, since the armrest device is retrofitted to the swing frame, it is only necessary to prepare one type of swing frame for the chair with and without the armrest device. Can be done without any problem. Furthermore, it can be applied to a synchro chair without any trouble.

  The present invention is a further development of the invention of the prior application, and can be mounted in a more robust state.

  According to the first aspect of the present invention, a swing arm that supports the backrest is attached to the base provided at the upper end of the leg support so as to be able to tilt backward against the elasticity of the spring means, and further provided with an armrest device. In the chair, the armrest device is configured to include a substantially horizontal elbow rest on which a seated person's elbow rests and a support section that supports the elbow rest from below, and the lower end of the support section is a swing arm. The rear end of the elbow rest is fixed to the swing arm or the backrest.

  The invention of claim 2 is characterized in that, in claim 1, the swing arm is provided with a rearwardly extending portion extending substantially in the front-rear direction and an upright portion (back strut portion) rising substantially upward from the rear end thereof. The lower end of the support portion in the armrest device is fixed to the rearward portion of the swing arm, and the rear end of the arm rest portion in the armrest device is fixed to one or both of the standing portion and the backrest of the swing arm.

  According to a third aspect of the present invention, in the second aspect, a pair of the swing arms are arranged on both the left and right sides of the base. A leg portion extending in a shape is integrally provided, and four members of the foot portion of the left and right armrest device and the standing portion of the left and right swing arm are fixed to a core material (substrate) of the backrest. The fixing means may be simply screwed.

  According to the present invention, since the swing arm and the armrest device, or the swing arm, the backrest, and the armrest portion are continuous in a loop shape when viewed from the side, the members can reinforce each other to ensure high strength. For this reason, it is possible to easily reduce the thickness of the armrest device.

  In particular, according to the second aspect, the upright portion of the left / right swing arm and the rear foot portion of the left / right armrest device are integrally connected by a bracket, and the bracket is fixed to the backrest. There is an advantage that the moving arm and the backrest are reinforced with each other, resulting in a more robust structure.

  Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 8 show a first embodiment.

(1). Outline First, an outline will be described with reference to FIGS. 1 is a right side view, FIG. 2 is a front view, FIG. 3 is a rear view, and FIG. 4 is a partial perspective view.

  The chair includes a leg device 1, a support base portion 2, a seat portion 3, a backrest portion 4, and an elbow device 5. The leg strut 1 includes a branch leg portion 7 provided with a caster 6 at the tip, and a leg strut (gas cylinder) 8 provided at the center portion of the branch leg portion 7 so as to be adjustable in height.

  On the other hand, the support base 2 includes a base 9 fixed to the upper end of the leg support 8, and the base 9 supports the seat 3. Although details are omitted, the seat portion 3 has a structure in which a cushion material is stretched on the upper surface of a seat plate (seat inner shell), and is attached to the intermediate member 10.

  The intermediate member 10 is made of a metal plate and has a U-shape with a downward opening when viewed from the front. The front portions of the left and right side plates are connected to the base 9 by the first shaft 11, but the insertion hole of the first shaft 11 in the base 11 Reference numeral 12 denotes a long hole that is long in the front-rear direction. Therefore, the intermediate member 10 (and the seat portion 3) can tilt backward while moving backward.

  The base 9 is formed in a box shape opened upward, and a swing arm 13 is arranged on the left and right sides thereof. The swing arm 13 includes a rearwardly extending portion 13a extending in the front-rear direction in a posture inclined after side view and a standing portion 13b rising substantially upward from the rear end thereof, and has a substantially L-shaped form as viewed from the side. The front end of the rearward facing portion 13a is connected to the base 9 so as to be tiltable rearwardly by a second shaft 14 that is long on the left and right.

  Further, the rearwardly facing portion 13 a of the swing arm 13 and the intermediate member 10 are connected by a third shaft 15 that is long in the left-right direction. For this reason, when the swing arm 13 (and the backrest 4) tilts backward, the seat portion 3 also moves backward and tilts backward. Inside the base 9, spring means (for example, a coil spring) that elastically supports the backward tilting of the swing arm 13 is disposed. The elastic force of the spring means can be adjusted with the knob 16.

(2) Details in detail Next, details will be described with reference to FIG. 5 is a perspective view of the main member, FIG. 6 is a side view of the armrest device 5, FIG. 7A is a cross-sectional view of the rearward facing portion 13a of the swing arm 13, and FIG. 5B is a VII-VII arrow in FIG. Sectional drawing of the fastening location in the state seen from the viewing direction, FIG. 8 is a VIII-VIII sectional view taken on the line of FIG.

  The swing arm 13 is, for example, a die-cast product such as aluminum (may be a resin product or a sheet metal product), and the rearward facing portion 13a is flat as a whole as shown in FIG. The inclined surface 13a 'is inclined upwardly toward the surface (of course, other cross-sectional shapes may be used).

  Further, the rearward portion 13a of the swing arm 13 is hollow, and a plurality of reinforcing ribs 18 are formed at appropriate intervals inside. The upright portion 13b of the swing arm 13 has a hole opened upward. Note that the rearwardly facing portion 13a and the standing portion 13b may continue in a loosely curved state, and it is not necessary to clearly define the boundary between them.

  The armrest device 5 includes an elbow rest portion 5a having a pad 5 'on the upper surface, a support portion 5b extending smoothly and obliquely rearward at the front end thereof, and the back side of the backrest 4 from the rear end of the arm rest portion 5a. And an inwardly extending portion 5c extending substantially horizontally and a foot portion 5d extending downward from the tip of the inwardly facing portion 5c.

  The tip of the support portion 5 b is a mounting portion 5 e swelled like a knob, and this mounting portion 5 e is fastened to the inclined surface 13 a ′ of the rearward portion 13 a of the swing arm 13 with screws (bolts) 20. Since the screw 20 is inserted into the mounting portion 5e from an obliquely lower side, the head and the mounting hole of the screw 20 do not touch the human eye. Therefore, even if the screw 20 is simply fastened, an aesthetic problem arises. Absent.

  In this embodiment, the pad 5 'is also screwed, and for this reason, a hole 21 through which a screw is inserted is formed in the support portion 5a. Of course, the pad 5 'may be fixed with an adhesive.

  As shown in FIG. 8, the backrest 4 is composed of a wooden substrate 28 such as plywood, a cushion material 29 stretched on both front and rear sides thereof, and a bag-like skin material 30 that completely wraps the front and back cushion materials 29. The backrest 4, the armrest device 5, and the swing arm 13 are integrated by screwing a screw (screw) 17 that penetrates the standing portion 13 b of the swing frame 13 and the foot portion 5 d of the armrest device 5 into the substrate 28. Yes.

  The screw 17 penetrates the connecting rod 22 inserted through the foot portion 5d and the standing portion 13b. Further, a demon nut 17 ′ is buried in the backrest substrate 28. The screw 17 does not necessarily have to penetrate the connecting rod 22.

  In the above configuration, since the armrest device 5 and the swing arm 13 are in a loop shape, the mounting strength of the armrest device 5 can be remarkably improved. For this reason, it can also be easily realized to make the elbow rest part 5a and the support part 5b thin and have a clean design. Moreover, since the support part 5a of the armrest apparatus 5 is excellent in support strength, it can also be easily realized to have a form extending long in the front-rear direction.

  As in the present embodiment, when the leg portion 5d of the armrest device 5 and the standing portion 13b of the swing frame 13 are directly fastened to the backrest 4 with the screw 17, the structure is simplified and the cost can be reduced. It is also possible to fasten the inward portion 5c of the armrest device 5 to the backrest 4 with a screw. The backrest 4 may have another structure.

  Although not shown, the upright portion 13b of the swing frame 13 has an upward hole, while the leg portion 5d of the armrest device 5 has a downward hole, and pipes or rods are formed in the holes of both members. A connecting material such as is inserted. For this reason, the integrity of the foot part 5d and the standing part 13b is increased, and the connection strength is further increased.

  The side shapes of the armrest device 5 and the swing arm 13 can be freely set. For example, as shown by a one-dot chain line in FIG. 1, the support portion 5b of the armrest device 5 may be extended downward from the front and rear middle portions of the elbow rest portion 5a. It is also possible to provide a plurality of support portions 5b. Furthermore, the support part 5b can be formed in a thin plate shape.

  Further, the swing arm can be integrated as a whole without being separated from the left and right. It is also possible to connect the rearward portion and the upright portion of the swing arm as separate members. Furthermore, a member corresponding to the bracket of the present embodiment can be integrally formed with the armrest device or the swing arm.

(2). Other embodiment (FIGS. 9 to 11)
9 to 11 show other embodiments. In this embodiment, the armrest device 5, the swing arm 13, and the backrest 4 are integrally fixed via a bracket. 9 is a rear view, FIG. 10 is a sectional view taken along the line XX of FIG. 9, and FIG. 11 is a sectional view taken along the line XI-XI of FIG.

  In this example, the bracket 23 is fastened to the standing part 13b of the swing arm 13 and the foot part 5d of the armrest device 5 with the screws 24, whereby four legs 5d and two standing parts 13b are provided. Are connected together. The screw 24 is screwed into the connecting rod 22.

  The bracket 23 is separated into an L-shaped vertical member 23a that overlaps the upright portion 13 and the foot 5d from the inside, and a horizontal member 23b that overlaps the left and right vertical members 23a. The vertical member 23a and the horizontal member 23b and the backrest 4 are fastened together with screws 25. Of course, the bracket 23 may be formed by bending a single metal body, and when it is composed of a plurality of members, the lateral member 23b may be one or three or more. The bracket 23 is covered with a cover 26 from the rear.

  In this example, the screw 258 is directly screwed into the substrate 28 of the backrest 4, but a demon nut may be used as in the first embodiment.

(3). Others The present invention can be embodied in various ways other than the above embodiment. For example, the armrest device and the swing arm can be integrated. However, in order to share a swing arm between a chair provided with an armrest device and a chair not provided with the armrest device, it is preferable that the chair is configured separately as in this embodiment.

  Fix the rear end of the armrest on the armrest device only to the upright part of the swing arm, or fasten the backrest to the armrest of the armrest device, and make the upright part of the swing arm to the armrest of the armrest device. It is also possible to conclude.

It is a right view of this embodiment. It is a front view. It is a rear view. It is a partial perspective view. It is a perspective view of a main member. 3 is a side view of the armrest device 5. FIG. (A) is a cross-sectional view of the backward-facing portion of the swing arm, and (B) is a cross-sectional view of the fastening portion of the support portion when viewed from the direction of arrows VII-VII in FIG. FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 3. It is a partially broken rear view. FIG. 9 is a sectional view taken along line XX in FIG. 8. It is the XI-XI sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Leg apparatus 2 Support base part 3 Seat part 4 Backrest 5 Armrest apparatus 5a Elbow pad part 5b Support part 5d Foot part 13 Swing arm 13a Backward part 13b Standing part 23 Bracket

Claims (3)

A swing arm that supports a backrest is attached to a base provided at the upper end of a leg post so that it can tilt backward against the elasticity of the spring means, and further includes an armrest device,
The armrest device includes a substantially horizontal elbow rest on which the seated person's elbow rests and a support section that supports the elbow rest from below, and the lower end of the support section is fixed to the swing arm. The rear end of the elbow rest is fixed to the swing arm or backrest.
A chair with armrests. The swing arm is configured to include a rearwardly extending portion extending substantially in the front-rear direction and an upright portion standing substantially upward from the rear end thereof, and the lower end of the support portion in the armrest device is fixed to the rearward portion of the swingarm. The rear end of the elbow rest in the armrest device is fixed to one or both of the upright portion and the backrest of the swing arm.
A chair with an armrest device according to claim 1. While the swing arm is disposed as a pair on the left and right sides of the base,
At the rear end of the armrest portion in the armrest device, a standing portion of the swing arm and a leg portion extending linearly are integrally provided, and the foot portion of the left and right armrest device and the standing portion of the left and right swing arm are provided. Fixing the person to the heart of the back,
A chair with an armrest device according to claim 2.

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