JP2005192797A - Backrest device for chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a fear of hitting a desk, etc. with a backrest support rod consisting of a metallic pipe to damage the desk, and to improve a safety aspect to the ends of cylindrical parts at the connection part of a backrest plate and the backrest support rods in a chair provided with a rotary seat part. <P>SOLUTION: In this backrest device for the chair, both of the right and left sides of a backrest plate are externally fitted to the backrest support rods 11 facing upward on both of the right and left sides of the rear part of the chair to fit the backrest plate to the backrest support rods 11. On both of the right and left sides of the backrest plate, the cylindrical parts 13 which can be fitted to the support rods 11 are provided facing upward, and cushion members 14 whose lower parts are fitted to the support rods 11, whose upper parts are fitted to the lower parts of the cylindrical parts 13 and which project in the direction of the whole outer periphery at the lower parts of the fitting parts are provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a backrest device, and more particularly to a chair backrest device in which the left and right sides of a backrest plate are fitted to pipe-like backrest support rods facing upward on the left and right sides of the back of the chair so that the backrest plate is attached.

  Conventionally, a chair with a backrest plate attached thereto as described above is known. (For example, Patent Documents 1 to 5).

  However, when the seat part of these chairs is accommodated in the space below the top plate of the desk, the backrest support rod may hit the desk and be damaged. In particular, the back support rod is generally formed of a metal pipe in order to ensure sufficient strength, so that the desk may be damaged.

Further, what is specifically described in the patent document is a chair in which the seat portion does not rotate. However, when the mounting form of the backrest plate is applied to a child chair in which the seat portion rotates, for example, Rotate the seat with the metal plate back support rod against the desk and damage it.
1993 Utility Model Application Publication No. 21260 (see FIGS. 1 and 2). Heisei 2 Utility Model Application Publication No. 3329 (see FIG. 8). 1996 Patent Application Publication No. 228882 (see FIG. 2) 1997 Patent Application Publication No. 121970 (see FIG. 1) 1998 Patent Application Publication No. 179325 (see FIG. 9)

  In view of the above situation, the present invention prevents the metal pipe backrest support rod from hitting a desk or the like in the chair, and even when applied to a chair having a rotary seat, the backrest of the metal pipe The chair is designed to improve safety with a protective cover at the end of the cylindrical part of the joint between the backrest plate and the backrest saddle. An object is to provide a backrest device.

According to the present invention, the above problem is solved as follows.
(1) In the chair backrest device in which the left and right sides of the backrest plate are fitted to the backrest support rods facing upward on the left and right sides of the back of the chair, and the backrest plate is attached to the backrest support rod, the left and right sides of the backrest plate In addition, a mounting portion that can be fitted to the back support rod is provided downward, the lower portion is fitted to the back support rod, and the upper portion is fitted to the lower portion of the mounting portion. A shock-absorbing member protruding in the entire outer peripheral direction is provided.
(2) In the above item (1), the backrest support rod is formed of a metal pipe.
(3) In the above item (1) or (2), the mounting portions on the left and right sides of the backrest plate are cylindrical portions that open downward, and this cylindrical portion is externally fitted to the backrest support rod.
(4) In any one of the above items (1) to (3), the buffer member is formed of an elastomer.
(5) In any one of the above items (1) to (4), the backrest plate is made of a synthetic resin.

According to the present invention, the following effects can be obtained.
(a) According to the invention described in the item (1), since the buffer member protruding in the entire outer peripheral direction of the mounting portion of the backrest plate fitted to the backrest support rod is provided, It serves to prevent the mounting portion of the back support rod and the back plate from colliding with a desk or the like.
Therefore, even when it is applied to a chair provided with a rotary seat and having a metal pipe backrest support rod, there is no consideration of the support rod being hit by a desk or the like and being damaged.
Furthermore, since the said buffer member is acting as a protection cover of the pipe end of the attachment part of a backrest board or a backrest support rod, the improvement of a safety surface can be aimed at.

  (b) According to the invention described in claim (2), by forming the back support bar with the metal pipe, practically sufficient physical strength can be easily obtained, and the back support bar is made of metal. The effect of the present invention is most effectively exhibited when it is made of a metal such as a pipe.

  (c) According to the invention described in the above (3), the mounting portion of the backrest plate can be easily fitted and supported by the backrest support rod, and the backrest plate including the mounting portion is made of synthetic resin. It can be easily molded by an integral molding method using

  (d) According to the invention described in the item (4), the effect described in the item (a) of the present invention can be obtained more favorably.

  (e) According to the invention described in the above item (5), the backrest plate in the present invention can be easily obtained.

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

FIG. 1 is a side view of a chair provided with the backrest device of the present invention, and FIG. 2 is a front view of the same.
The chair (1) includes a pedestal (3) erected at the center of a plurality of radially arranged legs (2) and is non-rotatably fitted in the pedestal (3). A support base (6) is attached to the upper end of the gas spring (4) via a support member (5). A footrest plate (7) is provided above the leg (2) at the upper and lower intermediate portions of the pedestal (3) to make it easier for children to use.
The support base (6) is rotatable with respect to the support member (5), and a seat portion comprising a seat shell (8) and a cushion member (9) is provided above the support base (6). (10) is installed.

Back support rods (11) and (11) are attached to the left and right of the rear portion of the support base (6).
The backrest support rod (11) is formed of a metal pipe, extends from the left and right of the rear part of the support base (6) upward and rearward, and then bent and extends forward and upwards, and has an open upper end. ing.

  On the other hand, on the left and right sides of the backrest plate (12), there are provided cylindrical portions (13) and (13) that open downward so that the backrest support rods (11) and (11) can be inserted.

  The cylindrical portion (13) is integrally formed when the backrest plate (12) is molded from a synthetic resin.

  The cylindrical portion (13) functions as an attachment portion for attaching the backrest plate (12) to the backrest support rod (11), and externally fits the cylindrical portion (13) to the backrest support rod (11). Thus, the backrest plate (12) is attached to the backrest support rod (11).

  3 is an exploded perspective view showing a part indicated by a one-dot chain line frame A in FIG. 2, and FIG. 4 is a vertical sectional view taken along line IV-IV in FIG.

  In the coupling portion where the tubular portion (13) is externally fitted to the backrest support rod (11), the lower portion is fitted to the backrest support rod (11), and the upper portion is the lower portion of the tubular portion (13). And a shock-absorbing member (14) projecting in the entire outer peripheral direction at the lower part of the cylindrical portion (13).

FIG. 5 is a plan view of the buffer member (14), and FIG. 6 is a vertical sectional view taken along line VI to VI in FIG.
As shown in FIGS. 5 and 6, the buffer member (14) has a substantially annular shape with a through hole (15) provided at the center.

  The through hole (15) has a backrest support and an upper fitting hole (15a) having a diameter substantially equal to the outer diameter of the cylindrical part (13) for fitting to the lower part of the cylindrical part (13). It consists of a lower fitting hole (15b) having a diameter substantially equal to the outer diameter of the backrest supporting rod (11) for fitting to the rod (11), and both communicate with each other.

  Since the cylindrical portion (13) is adapted to be externally fitted to the backrest support rod (11), the radius of the upper fitting hole (15a) is larger than the radius of the lower fitting hole (15b), The thickness is increased by the thickness of the cylindrical portion (13).

  The lower end outer peripheral wall (15c) of the lower fitting hole (15b) protrudes downward.

The buffer member (14) is made of an elastomer which is a polymer material exhibiting a large rubber elasticity at room temperature, such as cross-linked natural rubber or synthetic rubber, thermoplastic urethane rubber, various elastic resins such as spandex and polycarbonate.
The buffer member (14) is assembled as follows.

  First, as shown in FIG. 6, the cushioning member (14) has an upper fitting hole (15a) on the upper side and a lower fitting hole (15b) on the lower side. It is made to fit in. Next, the cylindrical portion (13) provided at the lower left and right sides of the backrest plate (12) is externally fitted to the backrest support rod (11) from above. Next, the buffer member (14) is moved upward, and the upper fitting hole (15a) is externally fitted to the lower end of the cylindrical portion (13).

It is a side view of a chair provided with the backrest apparatus of this invention. Similarly, it is a front view. It is a perspective view which decomposes | disassembles and shows the part shown with the dashed-dotted line frame A in FIG. It is the IV-IV line longitudinal cross-sectional view in FIG. It is a top view of a buffer member. FIG. 6 is a longitudinal sectional view taken along line VI to VI in FIG. 5.

Explanation of symbols

(1) Chair
(2) Leg
(3) Pillar
(4) Gas spring
(5) Support member
(6) Support base
(7) Footing plate
(8) seat shell
(9) Cushion member
(10) Seat
(11) Back support heel
(12) Back plate
(13) Cylindrical part (mounting part)
(14) Buffer member
(15) Through hole
(15a) Upper mating hole
(15b) Lower fitting hole
(15c) Lower peripheral wall

Claims (5)

In a chair backrest device in which the left and right sides of the backrest plate are fitted to the backrest support rods facing upward on the left and right sides of the back of the chair, and the backrest plate is attached to the backrest support rod, the backrest on the left and right sides of the backrest plate A mounting portion that can be fitted to the support rod is provided facing downward, the lower portion is fitted to the back support rod, and the upper portion is fitted to the lower portion of the mounting portion. A chair backrest device comprising a cushioning member protruding in a direction. 2. The chair backrest device according to claim 1, wherein the backrest support ridge is formed of a metal pipe. The chair backrest device according to claim 1 or 2, wherein the mounting portions on the left and right sides of the backrest plate are cylindrical portions that open downward, and the cylindrical portions are externally fitted to a backrest support rod. . The chair backrest device according to any one of claims 1 to 3, wherein the buffer member is made of an elastomer. The chair backrest device according to any one of claims 1 to 4, wherein the backrest plate is made of a synthetic resin.

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