JP4510598B2 - Backboard mounting structure for chairs - Google Patents

Description

  The present invention relates to a structure for attaching a back plate in a chair that allows the back plate to be easily attached to a back frame.

As this type of back plate mounting structure, for example, there are those described in Patent Documents 1 and 2.
Japanese Utility Model Publication No. 57-46849 Japanese Utility Model Publication No. 2-145143

  In the mounting structure of the back plate described in the above-mentioned Patent Document 1, a gripping metal fitting is screwed to both side end portions of the lower end of the back plate, and a pair of bulging portions that form an arc shape are provided on the backrest support rod. The lower end of the back plate is attached to the backrest support rod by fitting from above the engagement rod facing upward fixed to the inner surface of the lower end.

  For this reason, it is necessary to manufacture a gripping bracket having a complicated shape, which increases the cost, and when a manufacturing error or a mounting error occurs in the gripping bracket, the bulging portion and the engagement rod are displaced, It may take time to fit them.

  On the other hand, in the mounting structure of the back plate described in Patent Document 2, dowels project inwardly on the opposite surfaces of the left and right back support rods (rear support rods), and the dowels of the back plate are provided on both dowels. Since the recessed portion formed on the side facing the left and right direction is fitted and attached, the entire chair is temporarily assembled so that the distance between the left and right back support rods is increased by the length of the dowel, or The entire chair must be assembled with the dowels fitted in the recessed portions in advance, and the mounting of the back plate and the assembly of the entire chair are troublesome.

  Moreover, since it cannot be removed easily after the back plate is attached, it is inconvenient when replacing it.

  The present invention has been made in view of the above problems. The lower end of the back plate can be attached very easily without using a screw or a specially manufactured attachment member, and the back plate can be attached or detached alone. It is an object of the present invention to provide a back plate mounting structure in a chair that can be used.

According to the present invention, the above problem is solved as follows.
(1) In the mounting structure of the back plate in the chair, in which the back plate is attached to the back frame formed by connecting the upper ends of a pair of left and right back support rods standing up from the back of the seat with a horizontal connection rod. Support shafts projecting inwardly on inner surfaces facing each other at the lower end portions of the left and right backrest support rods, and can be fitted between the inner surfaces of the left and right backrest support rods on both support shafts. Fit the holding grooves facing the left and right sides of the upper and lower sides, which are open on the outside and the lower side, provided at the lower ends of both left and right sides of the back plate, and fix the upper end of the back plate at the appropriate position above the back frame. To do.

(2) In the above item (1), the width of the back plate is set to a dimension that can cover at least a part of the front surface of the left and right backrest support rods, and the holding groove is provided on the rear surface of the back plate. Provided on the lower surface of the part.

(3) In the above paragraph (1), a ridge piece that abuts the inner surface of the left and right backrest support rods is provided on the rear surface of the left and right side portions of the back plate so as to protrude rearward. A holding groove is provided.

(4) In any one of the above items (1) to (3), the upper piece of the mounting bracket having an inverted L shape when viewed from the side is fixed to the front surface of the horizontal connecting rod so as to face forward. The rear surface of the back plate is fixed to the downward piece hanging from the front end of the rear plate with screws from the rear.

According to the first aspect of the present invention, the lower end of the back plate can be attached to the backrest support rod very easily without using a screw or a specially manufactured attachment member.
In addition, since the lower end of the back plate can be attached simply by fitting its holding groove to the support shaft from above, even if the upper ends of the backrest support rods are connected by a horizontal connection rod, the back plate is attached independently. Or can be removed.

  According to the second aspect of the present invention, the back plate covers a part of the front surface of the back support rod, and the holding groove is also provided on the lower surface of the protrusion projecting backward on the rear surface of the back plate. Since the fitting part with the shaft cannot be seen from the front, the appearance of the entire chair is improved.

  According to the invention of claim 3, with the back plate positioned in the left-right direction by the left and right ridge pieces, the holding groove provided at the lower end of the ridge piece is dropped from above and easily fitted to the support shaft. In addition, the entire back plate can be prevented from being displaced in the left-right direction.

  According to the fourth aspect of the present invention, the fixing portion of the upper end portion of the back plate to the lateral connection rod is not visible from the front and is difficult to see from the side, so that the appearance is improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a chair to which the present invention is applied, FIG. 2 is a plan view, and FIG. 3 is an exploded perspective view.

  The chair frame consists of a pair of left and right leg frames (1), (1) joined in a substantially mouth shape when viewed from the side, and a back frame (2) connected to the upper end of the vertical frame (1a) at the rear of them. ).

  The rear vertical frame (1a) and the upper end of the front vertical frame (1b) in the left and right leg frames (1) are joined together by horizontal frames (3) and (3) fixed to their facing surfaces. ing. The leg frame (1) is made of a stainless material or the like having a flat rectangular tube-shaped cross section.

  The lower end of the front vertical frame (1b) and the rear end of the horizontal frame (1c) connected to the upper end are respectively the inner surface of the front end of the base frame (1d) and the rear vertical frame (1a). Combined to the side. Accordingly, as shown in FIG. 2, the horizontal dimension between the side edges of the front vertical frame (1b) and the horizontal frame (1c) is larger than the horizontal dimension of the rear vertical frame (1a) and the base frame (1d). When the chair is stacked, the upper and lower leg frames (1) are prevented from interfering with each other.

  The back frame (2) is a pair of left and right backrest support rods (1) that stand integrally from the upper ends of the vertical frames (1a) at the rear of the left and right leg frames (1). 4) It is composed of (4) and a horizontal connecting rod (5) coupled to the opposed surfaces of their upper ends.

  The horizontal connecting rod (5) is made of a round bar material such as stainless steel, and the central portion excluding both end portions thereof is curved in an arc shape so as to protrude rearward in a plan view.

  Since the horizontal connecting rod (5) is formed on both side ends, bolts (7) inserted from the outside of the cylindrical mounting portion (4a) at the upper end of the backrest supporting rod (4) are inserted into the screw holes (6). By screwing, it is fixed to the opposing surfaces of the two backrest support ridges (4).

  On the upper surface of the horizontal frame (1c) and the rear horizontal frame (3) in the left and right leg frames (1), the front end is curved in a downward arc along the upper front of the front vertical frame (1b). A resin seat plate (8) is placed.

  The front and back lower surfaces of the seat plate (8) are supported by left and right support plates (9) and (9) fixed to the opposing surfaces of the horizontal frame (1c) in the left and right leg frames (1), and both supports It is fixed by a plurality of screws (10) screwed onto the lower surface of the seat plate (8) from below the plate (9) (see FIG. 2).

  A back plate (11) made of synthetic resin is attached to the front surface of the back frame (2), and the back frame (2) and the back plate (11) form a backrest.

  The back plate (11) has a central portion that is curved in a gentle arc shape toward the rear, and on the rear surfaces of both end portions, as shown in FIG. A ridge piece (12) that abuts on the inner surface of the left and right backrest support rods (4) having a flat rectangular tube-shaped cross section, and a lateral end portion of the backrest support rod (4) on the outer side. Short ribs (13) that are in contact with or close to the front surface project in a rearward direction along the vertical direction in parallel with each other.

  The ridge piece (12) has a substantially U-shape when viewed from the rear, and is continuously formed on the rear surface of the lower end of the back plate (11).

  The left and right ridges (12) are fitted between the inner side surfaces of the left and right backrest support ridges (4), so that the seat plate (11) is positioned in the left and right direction and moved in the left and right direction. Is prevented.

  A pair of surface fasteners having a required length in the vertical direction is formed on the concave portion (14) formed by the ridge piece (12) and the rib (13) and on the front surface of the backrest supporting rod (4) facing the concave portion (14). (15) (16) is bonded, and when the back plate (11) is attached to the back frame (2), the hook and loop fasteners (15) and (16) are hooked together, and both sides of the back plate (11) The end is in close contact with the front surface of the backrest support ridge (4).

  As shown in FIG. 3 and FIG. 5, an upward concave holding groove (17) is formed at the lower ends of the left and right protruding strips (12). Yes.

  The holding groove (17) may be provided on the rear surface of the lower end portion on both sides of the back plate (11) with a protrusion protruding rearward and on the lower surface of the protrusion.

  The left and right holding grooves (17) are provided with support shafts (18) projecting inwardly on inner surfaces facing each other at the lower ends of the left and right backrest support rods (4) when the back plate (11) is attached. 18) is fitted from the top. Therefore, the lower part of the back plate (11) can be easily attached to the back frame (2) even if the lateral coupling rod (5) of the back frame (2) is fixed in advance.

  Near the center of the rear surface of the upper end of the back plate (11), as shown in FIGS. 3, 6 and 7, two mounting bosses (19) and (19) are projected rearwardly. Is covered with a cylindrical cover (20) formed integrally with the back plate (11) and having an open rear surface. On the side edge of the upper end of the cylindrical cover (20), horizontal cover pieces (21, 21) are integrally formed toward the outer side of the back plate (11).

  The left and right cover pieces (21) have a smaller front-rear dimension on the outer end side and are gradually widened toward the inner end, and the rear end surface is back to the back frame (2) as shown in FIG. When the plate (11) is attached, it is a curved surface that matches the bent shape so as to come into contact with the front surface of the lateral coupling rod (5).

  Behind the left and right mounting bosses (19), on the front surface near the center of the horizontal connecting rod (5) is a rear side of the upper piece (22a) of the mounting bracket (22) having an approximately inverted L-shaped cross section when viewed from the side. The ends are fixed by welding so that they face forward.

  In order to form the backrest by attaching the backplate (11) to the back frame (2), first, the two protrusions on the rear surface of the backplate (11) between the opposing faces of the left and right backrest support rods (4) ( 12) is fitted, and the holding grooves (17) at the lower ends of both side portions of the back plate (11) are fitted from above to the support shaft (18) protruding from the lower end of the back support rod (4).

  When the back plate (11) is strongly pressed backward in this state, the hook and loop fasteners (15) and (16) are hooked and temporarily fixed, so that the back plate (11) does not fall forward.

  Moreover, even if both sides of the back plate (11) are deformed due to heat distortion after molding and a gap is formed between the front surface of the back support rod (4), the surface fastener (15) ( 16) brings both sides into close contact with each other, so that the appearance is improved and the back plate (11) does not rattle or float back and forth.

  Next, as shown in FIG. 6, the left and right mounting brackets (22) attached to the horizontal connecting rod (5) have the downward facing pieces (22b) connected to the left and right mounting bosses (19) of the back plate (11). The screw (24) that is in contact with the rear surface and inserted from the through hole (23) of the downward piece (22b) is screwed into the screw (25) to be formed on the mounting boss portion (19) and tightened.

  As a result, a backrest having a shape in which the rear surface of the upper end portion of the back plate (11) is separated from the front side of the lateral coupling rod (5) is formed, and as shown in FIG. The end abuts against the front surface of the horizontal connecting rod (5), and the gap formed between the rear surfaces of the left and right sides of the back plate (11) and the horizontal connecting rod (5) is closed.

  In addition, a hand-insertable handle is provided between the opposing surfaces of the left and right cover pieces (21) and between the opposing surfaces of the central front part of the lateral connection rod (5) and the central rear part of the back plate (11). The chair can be carried by forming the space (26) and using the central portion of the lateral connection rod (5) as the handle (27).

  The handle (27) is located behind the back plate (11) and is not visible from the front of the chair, so the appearance is good, and the handle (27) is cut off at the upper end of the back plate (11) as in the past. Since it is not necessary to form, the appearance of the backrest is also improved.

  The head of the screw (24) for fixing the back plate (11) and the downward piece (22b) of the mounting bracket (22) are synthetic resin having a substantially U-shaped cross section as shown in detail in FIG. The cap (28) made of metal is inserted into the cylindrical cover (20), and the inwardly engaging claws (28b) formed at the front ends of the left and right side pieces (28a) are By being elastically engaged with the front edges of both side ends of (22b), it is covered well.

  Further, as shown in FIG. 6, the upper piece (22a) of the mounting bracket (22) is also covered from above by the left and right horizontal cover pieces (21) so as not to be exposed to the outside.

It is a side view of the chair to which this invention is applied. Similarly, it is a partially cutaway plan view. Similarly, it is an exploded perspective view. FIG. 4 is an enlarged cross-sectional plan view taken along line IV-IV in FIG. 1. Similarly, it is a VV line expansion transverse plane view. FIG. 5 is an enlarged vertical side view taken along line VI-VI in FIG. 2. It is the VII-VII line crossing top view of FIG.

Explanation of symbols

(1) Leg frame
(1a) (1b) Vertical frame
(1c) Horizontal frame
(1d) Base frame
(2) Back frame
(3) Horizontal frame
(4) Back support
(4a) Cylindrical mounting part
(5) Horizontal connection rod
(6) Female thread hole
(7) Bolt
(8) Seat plate
(9) Support plate
(10) Screw
(11) Back plate
(12) Projection strip
(13) Rib
(14) Recess
(15) (16) Hook fastener
(17) Holding groove
(18) Support shaft
(19) Mounting boss
(20) Cylindrical cover
(21) Cover piece
(22) Mounting bracket
(22a) Upper piece
(22b) Downward strip
(23) Through hole
(24) Screw
(25) Female thread
(26) Hand space
(27) Handle
(28) Cap
(28a) Side piece
(28b) Locking claw

Claims (4)

In a back plate mounting structure in a chair in which a back plate is attached to a back frame formed by connecting upper ends of a pair of left and right back support rods standing from the back of a seat by a lateral connection rod. In the back plate that can be fitted between the inner side surfaces of the left and right back support ridges , projecting inwardly on the inner surfaces facing each other at the lower end of the back support heel, The left and right side lower ends provided on the outer side and the upwardly concave holding groove facing the left and right direction are fitted, and the upper end of the back plate is fixed at the upper part of the back frame. The mounting structure of the back board in the chair which is the feature.   The lateral width of the back plate is set to a size that can cover at least a part of the front surface of the left and right back support rods, and the holding groove is provided on the lower surface of the projecting portion projecting backward on the rear surface of the back plate. Structure of the back plate of the chair.   2. The protrusion according to claim 1, wherein protrusions that contact the inner surfaces of the left and right backrest support rods are provided on the rear surfaces of the left and right sides of the back plate so as to protrude rearward, and holding grooves are provided at the lower ends of both protrusions. Mounting structure of the back plate in the chair.   The upper piece of the mounting bracket that is L-shaped in a side view is fixed to the front surface of the horizontal connecting rod so that it faces forward, and the rear face of the back plate is attached to the lower piece that hangs down from the front end of the upper piece. The mounting structure of the back board in the chair in any one of Claims 1-3 fixed by a screw more.

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