JP5410672B2 - Chair backrest mounting structure - Google Patents

Description

  The present invention relates to a chair backrest mounting structure.

Conventionally, a chair having a backrest is known (for example, refer to Patent Document 1). As shown in FIG. 11, the chair of Patent Document 1 includes a backrest 40 including a back frame 41 and a back plate 42 provided inside the back frame 41, and a receiving base 43 that supports the backrest 40. A leg 44 that rotatably supports the base 43 and a seat 45 disposed on the base 43 are provided.

The back frame 41 and the back plate 42 are integrally formed of resin. The backrest 40 is provided with mounting legs 46 extending downward from both sides. The backrest 40 is attached to the cradle 43 by fixing the mounting legs 46 to the support rods 47 extending upward from both sides of the cradle 43 with bolts 48. The head of the bolt 48 is concealed by a cover member 49.
JP 2007-125220 A

  However, the chair with a backrest in which the conventional back frame and back plate are integrally molded has the backrest attached to the cradle with only the fasteners such as bolts and nuts. There was a problem that the work was troublesome. In addition, there is a problem that the appearance is impaired because the fixture is exposed to the outside.

In addition, a nut is integrally formed on the back frame by insert molding, and after the back frame is placed on the cradle, a bolt is inserted from the cradle side and screwed into the nut of the back frame to receive the back frame. Although what is fixed to a stand is also known, in this case, for example, when the chair is discarded, it is necessary to separate the resin back frame and the metal nut, which is troublesome.

  The present invention has been made in view of such problems, and an object thereof is to provide a mounting structure for a backrest that is easy to assemble, discards easily, and can improve the appearance.

The present invention employs the following means in order to solve the above problems.
That is, the present invention
A backrest mounting structure for a chair comprising: a pedestal supported by legs; a back frame and a back plate provided in the back frame are integrally molded, and the backrest is attached to the cradle;
A mounting hole provided in one of the cradle or the back frame and extending in the vertical direction; a mounting shaft provided in the other and inserted into the mounting hole;
Is provided.

  According to the present invention, the backrest can be attached to the cradle simply by inserting the attachment shaft provided on one of the backrest or the cradle into the attachment hole provided on the other. As a result, the backrest can be supported by the fitting force between the mounting shaft and the mounting hole, so there is no need for a fixture to fix the backrest and the cradle, or the number can be reduced, and the number of parts and assembly man-hours can be reduced. Become. Further, since the number of fixtures exposed to the outside is reduced, the appearance is improved.

  Here, the mounting hole or the mounting shaft can be provided at a predetermined height from the cradle of the back frame. Further, the cradle may have a back column extending upward, and the mounting hole or the mounting shaft may be provided at the tip of the back column. The attachment hole may be provided with a movement restricting portion that restricts relative movement of the attachment shaft.

A nut insertion hole provided on the bottom side of the mounting hole for inserting a nut;
A bolt hole for inserting a bolt provided on the mounting shaft and screwed into the nut;
Can be provided.

  According to this configuration, when the mounting shaft is inserted into the mounting hole, the nut is inserted into the nut insertion hole, the bolt is inserted into the bolt hole of the mounting shaft, and then screwed into the nut. Can be fixed securely. Further, since the nut is not integrally formed with the back frame, it is not necessary to separate the back frame and the nut when the chair is discarded, and the disposal work is facilitated. Moreover, since the nut and the bolt are respectively configured to be inserted into the nut insertion hole or the entire bolt hole, it is possible to avoid the bolt and the nut from being exposed to the outside, so that the appearance is further improved.

  ADVANTAGE OF THE INVENTION According to this invention, while the assembly operation man-hour of a backrest and a receiving stand can be reduced, the disposal process of a chair becomes easy and the improvement of an external appearance can be aimed at.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a chair backrest mounting structure according to the present invention will be described in detail with reference to the accompanying drawings. The following embodiment is an example, and the present invention is not limited to the embodiment.

  FIG. 1 shows a front view of a chair 1 to which a chair backrest mounting structure according to the present invention is applied. The chair 1 includes a leg 11, a cradle 12 that is rotatably supported by the leg 11, a seat portion 13 provided on the cradle 12, and a backrest 14 that extends upward from the rear end side of the seat portion 13. And have. In FIG. 1 to FIG. 10, “upper”, “lower”, “left”, “right”, “front”, and “rear” indicate directions viewed from the user sitting on the chair 1.

  Next, each of the above components will be described. The leg 11 has a plurality of foot portions 11a extending radially from the center, and wheels 11b provided at the tips of these foot portions 11a. The cradle 12 is rotatably provided at the center of the leg 11. The seat 13 is mounted on the cradle 12.

  As shown in FIG. 2, the backrest 14 is formed in a curved shape that is concave toward the seat 13 according to the shape of the back of the user. Further, the back frame 20 of the backrest 14 is formed in a substantially rod shape, and the back plate 21 is formed in a plate shape.

  Further, as shown in FIG. 3, the back frame 20 has a predetermined height from the seat portion 13, for example, a portion corresponding to the waist of a user of a standard physique as a base point portion 23, and is above the base point portion 23. The portion and the portion below the base portion 23 are inclined at an appropriate angle in the direction away from the seat portion 13. That is, the base point part 23 protrudes to the seat part 13 side.

  As shown in FIG. 4, the backrest 14 includes a back frame 20 as a back frame formed in a substantially square frame shape, and a back plate 21 provided in the back frame 20. The back frame 20 and the back plate 21 are integrally formed of, for example, a flexible synthetic resin. The back frame 20 is supported on both sides by a back column 22 as a support rod extending upward from the cradle 12.

  The back frame 20 includes a left frame portion 20a and a right frame portion 20b that support both sides of the back plate 21, and an upper frame portion 20c and a lower frame portion 20d that connect upper and lower ends of the left and right frame portions 20a and 20b. doing. A substantially central portion of the lower frame portion 20d is fixed to a connecting member 22a that connects the back column 22 with bolts. Thereby, the lower side of the backrest 14 is firmly fixed to the cradle 12, and the upper side is relatively easily deformed.

  The back frame 20 is formed such that the upper part from the base point part 23 of the left and right frame parts 20a, 20b is widened upward as viewed from the back (rear), and the lower part from the base point part 23 is widened downward. ing. That is, the left and right frame portions 20a and 20b are formed such that the base point portion 23 is in a constricted shape when viewed from the back (rear). The back plate 21 has a large number of rhombic holes 24 and is formed in a net shape. In addition, the upper and lower predetermined range H in the base point portion 23 of the back plate 21 is formed thicker than other portions.

  As shown in FIG. 4, the backrest 14 is attached to the back column 22 of the cradle 12 by an attachment portion 25. As shown in FIG. 5, the mounting portion 25 includes a slide hole (mounting hole) 26 extending vertically and provided on either the back column 22 of the cradle 12 or the back frame 20 of the backrest 14 and the other. And a slide shaft (mounting shaft) 27 extending in the vertical direction.

  In the present embodiment, a protruding portion 28 that protrudes rearward is provided in the vicinity of the base point portion 23 in the left and right frame portions 20 a and 20 b of the back frame 20, and a slide hole 26 is provided in the protruding portion 28. Further, the tip of the back column 22 is bent upward at a substantially right angle to provide an attachment piece 29, and a slide shaft 27 protruding forward is provided on the attachment piece 29. The slide shaft 27 may be provided on the back frame 20 side, and the slide hole 26 may be provided on the back column 22 side.

  Further, the protruding portion 28 of the back frame 20 and the attachment piece 29 of the back column 22 are fastened by a nut 50 inserted into the protruding portion 28 and a bolt 51 inserted into the slide shaft 27.

  As shown in FIGS. 6A and 6B, the slide hole 26 of the back frame 20 opens toward the lower side of the protruding portion 28. Further, the slide hole 26 is provided with a groove 30 penetrating rearward over the entire length. In the present embodiment, the slide hole 26 has a square cross section. The bottom surface 26 a of the slide hole 26 functions as a movement restricting portion that restricts relative movement of the slide shaft 27. Furthermore, the nut insertion hole 52 for inserting the nut 50 (refer FIG. 5) from the outside is provided in the bottom face 26a side of the slide hole 26. As shown in FIG.

  As shown in FIGS. 7A and 7B, the slide shaft 27 of the back column 22 is formed in a shape substantially similar to the slide hole 26. The slide shaft 27 is provided on the back column 22 via a support piece 31 having a lateral width L smaller than that of the slide shaft 27. The slide shaft 27 is formed so that it can be easily inserted into the slide holes 26 of the left and right frame portions 20a, 20b and smoothly slid and moved within the slide holes 26. Furthermore, the slide shaft 27 is provided with a bolt hole 53 and a counterbore hole 54 into which a bolt 51 to be screwed into the nut 50 is inserted.

  As shown in FIG. 8, the shape and dimensions of the slide hole 26 and the slide shaft 27 are fitted to each other without rattling with the slide shaft 27 completely inserted into the slide hole 26, and are determined by the user. When the pressing load acts on the backrest 14, it is formed so as not to be deformed or damaged. In this embodiment, the case where the slide hole 26 and the slide shaft 27 have a square cross section has been described. However, the cross section of the slide hole 26 and the slide shaft 27 may be circular or other various shapes. In FIG. 8, the rhombic holes 24 are omitted for easy understanding of the drawing.

  When attaching the backrest 14 to the back strut 22, as shown in FIG. 9, the nut 50 is inserted into the nut insertion hole 52, and the backrest 14 is arranged above the back struts 22, 22 on both sides of the cradle 12. Then, the slide holes 26 on both sides of the back frame 20 are aligned with the slide shafts 27 of the back struts 22 on both sides. Then, the backrest 14 is lowered and the slide hole 26 is fitted into the slide shaft 27 of the back column 22.

  Further, the backrest 14 is lowered and the slide shaft 27 is relatively slid within the slide hole 26. When the mounting shaft 27 is inserted into the mounting hole 26 to some extent, the bolt 51 is inserted into the bolt hole 53 and screwed into the nut 50 in the nut insertion hole 52. As a result, as shown in FIG. 10, when the upper end of the slide shaft 27 comes into contact with the bottom surface (movement restricting portion) 26a of the slide hole 26, the lowering of the backrest 14 stops. Thereby, the backrest 14 is attached to the back column 22. In addition, the slide hole 26 can be provided in the back column 22, and the slide shaft 27 can be provided in the back frame 20. In this case, a movement restricting portion 26 a is provided on the lower end surface of the slide hole 26.

  As described above, the mounting structure of the backrest 14 according to this embodiment is such that the backrest 14 is lowered from above the cradle 12 and the slide hole 26 of the backrest 14 is fitted into the slide shaft 27 of the back column 22 to be relatively slid. Thus, the backrest 14 and the cradle 12 can be assembled. Accordingly, the number of parts and the number of assembling steps can be reduced because the fixtures are unnecessary or the number can be reduced. Further, since the number of fixtures exposed to the outside is reduced, the appearance is improved.

  Further, the backrest 14 can be more securely fixed to the back strut 22 by fastening the protruding portion 28 of the backrest 14 and the attachment piece 29 of the back strut 22 by the nut 50 and the bolt 51 separately from the backrest 14.

  As a result, when the back frame 20 and the back plate 21 of the backrest 14 are integrally molded, the backrest 14 is attached to the back strut by the nut 50 and the bolt 51 inserted from the outside without insert-molding the nut into the backrest 14. 22 can be securely fixed. Therefore, when the chair 1 is discarded, the work for separating the backrest 14 and the nut 50 is not necessary, and the disposal work is facilitated. Further, since the nut 50 and the bolt 51 are entirely inserted into the member, they can be prevented from being exposed to the outside, and the appearance can be improved.

  Furthermore, in this embodiment, since the attachment part 25 of the backrest 14 and the cradle 12 is provided in the vicinity of the base point part 23 of the backrest 14, the backrest 14 can be applied even when a large amount of pressing load is applied to the base point part 23. Can be reliably supported.

It is a front view which shows the chair which concerns on embodiment. It is a top view of the chair which concerns on embodiment, and is A arrow line view of FIG. It is a side view of the chair which concerns on embodiment, and is B arrow view of FIG. It is a rear view of the backrest which concerns on embodiment, and is C arrow line view of FIG. It is a side view which shows the attachment part of the backrest and cradle which concern on embodiment, and is E arrow line view of FIG. 6A is a view showing the mounting shaft of the back frame according to the embodiment, and is a view taken in the direction of arrow F in FIG. 5, and FIG. 6B is a view showing a cross section of the mounting shaft, and FIG. It is -G sectional drawing. 7A is a view showing the mounting hole of the cradle according to the embodiment, and is a view taken in the direction of arrow H in FIG. 5, and FIG. 7B is a view showing a cross section of the mounting hole, and FIG. -J sectional drawing. It is a figure which shows the fitting state of the attachment hole and attachment shaft which concern on embodiment, and is KK sectional drawing of FIG. It is a longitudinal cross-sectional view which shows the method of inserting the attachment axis | shaft of a cradle into the attachment hole of the backrest which concerns on embodiment. It is a figure which shows the state which inserted the attachment shaft which concerns on this embodiment completely in the attachment hole. It is a perspective view which shows the chair which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chair 11 Leg 11a Foot | leg part 11b Wheel 12 Base 13 Seat part 14 Back part 20 Back frame 20a Left frame part 20b Right frame part 20c Upper frame part 20d Lower frame part 21 Back board 22 Back column 22a Connecting member 23 Base point part 24 Rhino Shaped hole 25 Mounting portion 26 Slide hole 27 Slide shaft 28 Protruding portion 29 Mounting piece 30 Groove 31 Support piece 41 Back frame 42 Back plate 43 Receiving base 44 Leg 45 Seat portion 46 Mounting leg portion 47 Support rod 48 Bolt 49 Cover member 50 Nut 51 Bolt 52 Nut insertion hole 53 Bolt hole 54 Counterbore

Claims (4)

A backrest mounting structure for a chair comprising: a pedestal supported by legs; a back frame and a back plate provided in the back frame are integrally molded, and the backrest is attached to the cradle;
A mounting hole provided in one of the cradle or the back frame and extending in the vertical direction; a mounting shaft provided in the other and inserted into the mounting hole;
A nut insertion hole provided on the bottom side of the mounting hole for inserting a nut;
A bolt hole for inserting a bolt provided on the mounting shaft and screwed into the nut;
With
The mounting hole or the mounting shaft is provided at a predetermined height from the cradle of the back frame,
The mounting hole has a groove extending therethrough along the depth direction of the mounting hole,
The mounting shaft is provided on the cradle or the back frame through a support piece provided on a side surface along the axial direction of the mounting shaft.
The backrest mounting structure of a chair, wherein the support piece is fitted into the through-groove and the mounting shaft is inserted into the mounting hole.   The chair backrest mounting structure according to claim 1, wherein the cradle has a back column extending upward, and the mounting hole or the mounting shaft is provided at a tip portion of the back column.   The chair backrest mounting structure according to claim 1 or 2, wherein the mounting hole is provided with a movement restricting portion that restricts relative movement of the mounting shaft. The chair backrest mounting structure according to claim 3 , wherein the nut insertion hole is provided on a side opposite to the mounting hole across the movement restriction portion provided as a bottom surface of the mounting hole.

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