JP4180494B2 - Chair - Google Patents

Description

The present invention relates to a chair child.

  For example, in a swivel chair frequently used for office work, an armrest can be attached as an option in many cases. As an armrest attachment means, it is often fixed to a synthetic resin shell member that supports the seat, or to a metal support base fixed to the upper end of the leg.

  In any case, the base of the armrest (lower end) is overlapped from below on the elbow fixing part of the shell member or the support base, and most of them are fastened with about 3 to 4 screws (bolts, screws). is there. In addition, when the elbow fixing part is provided in the support base, the screw hole into which the screw is screwed is often directly formed in the support base, and when the elbow fixing part is in the shell member, the shell member A nut is embedded in the shell, or a reinforcing plate is stacked on the shell member to form a tapped hole.

On the other hand, Patent Document 1 and Patent Document 2 disclose that a shell member is formed with a hole in which the base of the armrest fits in from the lateral direction, and the base of the support base is fitted in the hole. .
Japanese Utility Model Publication No. 6-82594 Japanese Patent Laid-Open No. 10-127410

  The armrest is generally attached as an option, and the main body of the chair is almost the same structure with and without the armrest. If the base of the armrest is overlapped with the elbow fixing portion, the elbow fixing portion can be made a clean form, and therefore there is an advantage that the aesthetic appearance is not deteriorated in a state where the armrest is not attached.

  However, when attaching the armrest by screwing, the operator must operate the screwdriver by operating the screwdriver with the other hand while holding the armrest with one hand and holding it in the prescribed posture. There was a problem that the burden on the operator was heavy because it was necessary to keep lifting the armrest with one hand until it was screwed.

In the screwed first screw, firstly, the tip holding a screwdriver with one hand in the upward order fit the head of the screw in its tip, while maintaining its state grasp the armrest on the other hand The base part is accurately stacked on the elbow fixing part of the chair, and then the screw is inserted into the through hole formed in the base part of the armrest so that the driver can be operated. As a result, there is a problem that not only the work efficiency is poor, but also the worker is forced to work while taking care not to drop the screw, so the burden is doubled.

  There is also a method of turning the chair upside down and placing it on the table and screwing the armrest, but this not only puts a heavy burden on the operator, but also when the chair is turned over and placed on the table, the seat surface is soiled or damaged. There was also a risk of it.

  On the other hand, according to the above-mentioned patent documents, since the posture of the armrest is maintained by inserting the base portion of the armrest into the hole of the elbow fixing portion, the burden on the operator can be reduced and the work efficiency can be improved. However, since the elbow fixing part has a large hole with a lateral opening, there is a problem that if it is sold without an armrest, the aesthetics are lowered, and the processing of the elbow fixing part becomes troublesome.

  An object of the present invention is to improve such a current situation.

The chair according to the present invention is adapted to be fastened with screws by overlapping the base portion provided at the lower end of the elbow strut in the armrest that supports the elbow rest with the elbow strut on the elbow fixing portion of another member . The base of the armrest has an upper overlapping portion and a lower overlapping portion that is lower than the upper overlapping portion, and has a stepped shape when viewed from the front. Located on the opposite side of the column.

And in Claim 1, the said elbow fixing part is a reverse staircase shape in a front view so that the upper overlapping part and the lower overlapping part of the base in the armrest overlap from below, and the upper overlapping part of the armrest is The overlapping part is a projecting part that protrudes to the left and right outside in front view, and the upper overlapping part and the lower overlapping part of the base of the armrest are fastened to the elbow fixing part with screws inserted from below. Furthermore, the upper overlapping portion of the armrest is formed with a locking piece that overlaps the upper surface of the overhanging portion of the elbow fixing portion, and is locked when the base portion of the armrest is superimposed on the elbow fixing portion from the left and right outer sides. A piece overlaps the upper surface of the overhanging portion of the armrest so that the armrest is held so as not to fall.

According to a second aspect of the present invention, in the first aspect of the present invention, the support base includes a support base fixed to the leg support and left and right tilt frames extending rearward from the left and right outer sides of the support base, and the back frame is supported by the tilt frame. And the tilting frame is supported to tilt backward against a spring, and the left and right tilting frame has a bridge member arranged so as to span the left and right tilting frame. The left and right ends of the support base are fixed so that they protrude from the left and right sides of the support base.

The bridge member overhanging portion and the tilting frame are provided with a side cover having a reverse staircase shape in front view where the base of the armrest overlaps from below, so that the elbow frame includes the elbow frame, the bridge member, and the side cover. A fixing portion is configured, and an armrest base portion overlaps the side cover, and both are fastened with screws to the tilting frame and the bridge member, and the locking piece is fitted to the side cover. A full cutout is formed.

  According to the present invention, the armrest is held on the elbow fixing portion and fastened, but the armrest is held in a predetermined posture even if it is not grasped by hand, thus reducing the burden on the operator when attaching the armrest. At the same time, it is possible to improve the efficiency of the mounting work by eliminating the drop of the screw.

When the armrest is attached to the tilting frame , the armrest tilts together with the backrest when locking, so that it is possible to improve the sitting comfort without causing the arm to stretch freely when locking. .

Moreover, if comprised like Claim 2, since an armrest can be attached without removing a side cover one by one, an operation | work is easy, and it uses the side cover to hold an armrest in a predetermined posture. The tilting frame does not need to be specially processed, and there is an advantage that the labor of processing can be eliminated accordingly. Furthermore, since the side cover is firmly fixed to the tilting frame with screws, there is an advantage that the attachment strength of the side cover is high.

  Next, embodiments of the present invention will be described with reference to the drawings.

(1) .Basic structure of chair
Figures 1-9 show a first embodiment. FIG. 1 is a side view of a chair. As shown in FIG. 1 , the chair includes a leg 1 with casters, a seat 2, a backrest 3, and an armrest 4. The leg 1 is provided with a leg support 5 that is freely extendable and rotatable, and a support base 6 is fixed to the upper end of the leg support 5.

  The seat 2 is attached to the seat bracket 8 via the outer shell 7, and the front end portion of the seat bracket 8 is attached to the front end portion of the support base 6 so that it can be tilted backward and retracted by the first shaft 9. ing.

  Further, the front end portion of the tilt frame 10 is connected to the rear base portion of the support base 6 so as to be tiltable backward by the second shaft 11, and a back column 12 is provided at the rear of the tilt frame 10. The backrest 3 is attached to. A lumbar support 14 is disposed between the back column 12 and the backrest 3 so as to be adjustable in height.

  Further, the rear portion of the tilting frame 10 with respect to the third shaft 13 and the rear portion of the seat receiving bracket 8 are connected by the third shaft 13 so as to be relatively rotatable. For this reason, when the backrest 3 tilts backward, the seat 2 also moves backward while tilting back together.

FIG. 2 is a perspective view of the tilting frame 10. As shown in FIG. 2 , the tilting frame 10 is formed in an U-shaped cross-sectional outward opening and is arranged on the left and right, while the back struts 12 are arranged on the left and right with a slight gap. The lower portions of the back struts 12 are bent sideways and fitted into the tilting frame 10 and fixed by welding.

  The left and right back struts 12 are integrally fixed by a lower metal fitting 12a and an intermediate metal fitting 12b. Since the upper portions of the left and right back struts 12 are welded to an upper frame (not shown), the intermediate fitting 12b is not necessarily required. The third shaft 11 is fixed to the front end portion of the tilting frame 10 by welding.

Note that the tilting frame 10 and the back column 12 can be integrated. Further, the tilting frame 10 and the back posts 12 need not be disposed on the left and right to obtain Ri case of one mower. Further, it is possible to directly attach the backrest 3 to the tilting frame 10 without providing the back column 12.

Although not shown, the support base 6 is provided with a spring that supports the rearward tilting of the tilting frame 10. Although not shown, a gas cylinder for adjusting the tilt angle of the backrest 3 and for tilting the backrest 3 is disposed between the lower bracket 12a of the back column 12 and the support base 6 .

The second shaft 11, the bridge member 30 disposed so as to bridge the lateral tilt frame 10 are connected to each other again and again synthetic resin Riabusshi Interview及 beauty rear gold by pair. The bridge member 30 is fixed to the left and right tilt frames 10 by welding. The bridge member 30 is provided with left and right projecting portions 30a.

(2) Fixing the elbow strut Next, the means for attaching the armrest 4 will be described. FIG. 3 is a perspective view of the armrest 4. As shown in FIG. 3 , the armrest 4 is provided with an elbow post 35 made of a round pipe, and an elevating body 36 is attached to the elbow support 35 so that the height can be adjusted. An elbow rest 37 is attached to the elevating body 36 so as to be able to turn horizontally. The elevating body 36 is provided with a lever 38 for unlocking, and the lock is released by holding the elevating body 36 with a hand and pulling the lever 38. Needless to say, the elbow rest 37 is not limited to a movable type but may be a fixed type.

The elbow strut 35 is fixed to the projecting portion 30 a of the bridge member 30. This point will be described with reference to FIGS. 4-9. Of FIG. 4 (A) a rear portion of the rear view of the chair, (B) is a right side view, FIG 5 is cross-sectional plan view of a state of attaching the armrest 4 (A), FIG. 6 is a side view, FIG. 7 the VII-VII sectional view of FIG. 5, FIG. 8 is VIII-VIII sectional view of FIG. 5, FIG. 9 is a sectional view showing the armrest attachment procedure.

  A lower portion of the elbow support 35 is a horizontal portion 35a, and a metal plate connecting bracket 40 constituting a base portion (attachment portion) of the armrest 4 is fixed to the tip of the horizontal portion 35a by welding. . The connecting fitting 40 includes an upper overlapping portion 40a, a lower overlapping portion 40b, and a vertically long portion that connects them, and is formed in a stepped shape when viewed from the front. The horizontal portion 35 a of the elbow strut 35 has its end face abutted against the vertically long portion of the connection fitting 40, and the end surface and the upper portion are welded to the connection fitting 40. Thus, since the horizontal part 35a is welded to the connection metal fitting 40 by the end surface and the upper part, mutual attachment strength can be improved markedly.

A side cover 39 is fitted to the tilting frame 10 and the projecting portion 30a of the bridge member 30 by fitting from the left and right outer sides to cover them, and the connecting metal fitting 40 overlaps the side cover 39 from below. In addition, the connection fitting 40 and the side cover 39 are fixed to the tilting frame 10 and the bridge member 30 by three screws 41 screwed from below. The bridge member 30 and the tilting frame 10 are formed with a female thread portion 42 into which the screw 41 is screwed by burring. Of course, a nut may be welded.

On the upper surface of the connection fitting 40, as an example of an engaging means, a locking piece 43 that overlaps the protruding portion 30 a of the bridge member 30 is provided by bending (or may be welded), while the side cover 39 covers the bridge member 30. The portion 39b is formed with a notch (relief hole) 44 into which the locking piece 43 is fitted. The locking piece 43 protrudes toward the lower overlapping portion 40b.

Therefore, as shown in FIG. 9 (A), by superimposing the extending portion 30a of the bridge member 30 at a point notches 44 engaging piece 43, predetermined even armrest 4 is not 掴 Ndei by hand one by one It is held in the mounting posture. Therefore, the operator hands be free, it can be carried out As a result, the mounting operation of the armrest 4 efficiently. Note that the locking piece 43 is not necessarily overlapped on the upper surface of the bridge member 30, and an engagement hole in which the locking piece 43 is fitted can be formed in the side cover 39.

For example, as shown in FIGS. 4 and 7 , side ribs 39 a are provided on the side surface of the side cover 39 so as to cover the connecting fitting 40 from the front and the back. For this reason, the front-rear position of the armrest 4 can be accurately positioned, which is preferable.

Moreover, when the armrest 4 is fixed using the bridge member 30 as in the present embodiment, there is an advantage that the vertical height of the connecting fitting 40 can be increased and the fastening strength can be improved. That is, when also fastened to the bridge member 30, since on the lower length of the connecting metal fitting 40 as compared with the case where the fastening by the tilting frame 10 is long, connecting when seated occupant is only multiplied by the force to the armrest 4 The moment acting on the metal fitting 40 can be reduced, and the fastening strength increases accordingly.

As shown in FIGS. 4 and 5 , a rear cover 45 is disposed behind the bridge member 30. The rear cover 45 covers a portion of the tilt frame 10 that is behind the side cover 39 and also covers a space surrounded by the left and right tilt frames 10.

(3). Second embodiment (FIG. 10)
FIG. 10 shows a second embodiment. In this embodiment, the connecting fitting 40 is formed in a block shape as a die-cast product such as aluminum, and the boss portion 40c formed on the connecting bracket 40 is horizontally connected to the elbow support 30. The shape portion (base end portion) 35a is fitted and fixed with a screw (not shown). In this case, the elbow support preferably has a non-circular cross-sectional shape such as an oval shape.

It is a side view of the chair concerning a 1st embodiment. It is a perspective view of a tilting frame. It is a perspective view of an armrest. It is a separation top view of a tilting frame and a side cover. It is a plane sectional view in the state where an armrest was attached. It is a side view of the principal part. 5 is a sectional view taken along the line VII-VII. FIG. 6 is a sectional view taken along the line VIII-VIII in FIG. 5. It is sectional drawing which shows the attachment procedure of an armrest. It is a figure which shows 2nd Embodiment.

Explanation of symbols

2 Seat 3 Backrest 4 Armrest 10 Tilt frame
30 Bridge member
30a Overhang portion 35 of bridge member Elbow post 37 Elbow pad 39 Side cover 40 Connecting metal fitting constituting base of armrest
40a Upper polymerization part
40b Lower overlapping portion 41 Screw for fastening
42 internal thread portion 43 locking piece 44 notch

Claims (2)

The base portion provided at the lower end of the elbow strut in the armrest formed by supporting the elbow rest with the elbow strut is overlapped with the elbow fixing portion of another member and fastened with screws .
In the configuration
The base portion of the armrest has an upper overlapping portion and a lower overlapping portion lower than the upper overlapping portion, and has a stepped shape when viewed from the front, and the lower overlapping portion is located on the opposite side of the elbow strut with the upper overlapping portion interposed therebetween. While
The elbow fixing portion has a reverse staircase shape when viewed from the front so that the upper overlapping portion and the lower overlapping portion of the base of the armrest overlap from below, and the portion where the upper overlapping portion of the armrest overlaps is left and right when viewed from the front It is an overhanging portion protruding outward, and the upper overlapping portion and the lower overlapping portion of the base in the armrest are fastened to the elbow fixing portion with screws inserted from below into them,
Furthermore, a locking piece that overlaps the upper surface of the overhanging portion of the elbow fixing portion is formed in the upper overlapping portion of the armrest, and when the base portion of the armrest is overlapped on the elbow fixing portion from the left and right outer sides, the locking piece is The armrest overlaps the upper surface of the overhanging part so that it cannot be dropped.
Chair. A support base fixed to the leg support; and left and right tilt frames extending rearward from the left and right outer sides of the support base. A backrest is attached to the tilt frame, and the tilt frame is a spring. Is supported to tilt backwards against
Furthermore, the bridge member arranged so as to be bridged to the left and right tilt frame is fixed to the left and right tilt frame in a state in which left and right end portions thereof are overhanging portions protruding to the left and right outer sides of the support base,
The bridge member overhanging portion and the tilting frame are provided with a side cover having a reverse staircase shape in front view where the base of the armrest overlaps from below, so that the elbow frame includes the elbow frame, the bridge member, and the side cover. A fixing portion is configured, and an armrest base portion overlaps the side cover, and both are fastened with screws to the tilting frame and the bridge member, and the locking piece is fitted to the side cover. Forming a full cutout,
The chair according to claim 1.

Images