JP4828236B2 - Chair - Google Patents

Description

  The present invention relates to a chair formed by supporting a rear portion of a seat body on a leg body so as to be rotatable up and down.

A typical example of this type of chair is described in Patent Document 1, for example.
Japanese Patent Laid-Open No. 2001-128776

  In the chair described in Patent Document 1, the lower surfaces of both sides of the rear end portion of the seat plate are supported by a pair of left and right seat plate mounting brackets that are L-shaped in front view with a relatively long front and rear dimension. A mounting piece extending upward from the rear ends of both brackets is pivotally mounted on the opposing surfaces of the left and right rear legs so that it can be pivoted up and down, and the left and right seat plate mounting brackets are made of synthetic resin bracket covers. Covered by.

  Therefore, in both the use state of the chair and the non-use state in which the seat body is turned upward, the bracket and the mounting portion of the bracket cover on the seat plate are greatly exposed to the outside, and are not visible. It has become.

  In addition, since the bracket and the bracket cover are directly fixed to the lower surface of the seat plate with screws, the thickness of the seat plate is increased in order to increase the strength of the mounting portion of the bracket to the seat plate and the support strength of the seat plate by the bracket. In addition, it is necessary to increase the rigidity, and there is a problem that it cannot be applied when, for example, it is desired to manufacture a chair having a light feeling by molding a thin seat plate with a synthetic resin or the like.

  The present invention has been made in view of the above problems, and improves the appearance of the mounting portion of the seat body to the bracket, and can be stably supported by the leg body even with a thin seat body. The purpose is to provide.

According to the present invention, the above problem is solved as follows.
(1) In a chair in which the rear portion of the seat body is supported by the leg body so as to be rotatable with a support shaft facing in the left-right direction, the chair body is upwardly provided with a recessed hole that opens downward on the left and right sides of the rear portion of the seat body. Protruding portions are provided, and the lower end portions of a pair of left and right seat support brackets whose upper end portions are pivotally attached to the legs with the support shafts are inserted into the outer surfaces of both upward protruding portions from the outer sides thereof. The bolt is fixed by screwing into a female screw of a fixing member fitted in the concave hole.

(2) In the above section (1), the fixing member is connected to the upper fitting portion facing in the vertical direction and the lower end portion thereof, and the lower fitting with the front and rear and left and right dimensions larger than that of the upper fitting portion. The fixing member and the recessed hole are formed in a shape complementary to each other.

(3) In the above item (2), the lower fitting portion has a bottom piece that closes the lower open end of the concave hole so as to be flush with the lower surface of the seat.

(4) In any one of the above items (1) to (3), the fixing member is integrally formed of a fiber reinforced synthetic resin material.

(5) In any of the above items (1) to (4), a fitting groove having a concave shape in a side view is provided on the outer surface of the upward projection, and the lower end portion of the seat support bracket is fitted into the fitting groove. And fix with bolts.

(6) In the above item (5), the fitting groove is shaped so that the lower part gradually widens, and the lower end portion of the seat support bracket fitted to the fitting groove is shaped to complement the fitting groove. .

(7) In the above item (5) or (6), the cover that covers the lower end portion of the seat support bracket and the head portion of the bolt that fixes the seat support bracket is fixed to the fitting groove.

  According to the first aspect of the present invention, the upward protrusions having the recessed holes opened downward are provided on the left and right sides of the rear portion of the seat body, and the lower end portion of the seat support bracket is provided on the outer surface thereof. Since the bolt inserted from the outside is fixed by screwing into the female screw of the fixing member fitted in the concave hole, the mounting portion of the seat support bracket to the seat body is externally used in the chair usage state. The appearance can be improved.

  Further, when the seat support bracket is fixed to the outer side surface of the upward projection with a bolt, the outer side piece from the concave hole in the upward projection is sandwiched between the fixing member and the seat support bracket, and the entire upward projection Therefore, the rear end of the seat body can be stably supported by the leg body. Therefore, for example, it is possible to produce a chair having a light feeling by forming the seat plate constituting the seat body thinly with a synthetic resin or the like.

According to the second aspect of the present invention, when the fixing member is fitted into the concave hole, the upper surface of the lower fitting portion comes into contact with the lower surface of the opening portion of the lower portion of the concave hole forming a complementary shape therewith. The load applied to the rear portion can be effectively and stably supported by the upper surface of the lower fitting portion.
In addition, since the fixing member and the concave hole are complementary to each other, the fixing member can be easily positioned by simply fitting the fixing member into the concave hole from below, and rattling is also prevented. Is done.

  According to the third aspect of the present invention, the lower end of the concave hole is blocked by the bottom piece of the lower fitting portion so as to be flush with the lower surface of the seat body. Even in the use state, the concave hole and the fixing member are not exposed to the outside, and the appearance is improved.

  According to the invention described in claim 4, since the rigidity of the fixing member is increased, the support strength of the rear portion of the seat body is increased.

  According to the fifth aspect of the present invention, the seat support bracket can be stably fixed to the outer side surface of the upward projecting portion while preventing wobbling in the front-rear direction.

  According to the sixth aspect of the present invention, since the seat support bracket is prevented from moving upward in the fitting groove with respect to the downward load applied to the seat body, the support strength of the seat body is further increased.

  According to the seventh aspect of the present invention, the lower end portion of the seat support bracket, the fitting groove, and the head of the bolt are covered with the cover and are not exposed to the outside. Is further improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of the chair of the present invention, FIG. 2 is a side view of the chair, and the chair (1) is composed of a leg (2) made of pipe, a seat (3), and a back. It has a drool (4) and an armrest (5).

  The leg (2) has a pair of left and right front legs (7) and (7) which are inclined upward after the caster (6) is attached to the lower end, and is slightly rearwardly open from the upper end. A pair of left and right upper legs (8), (8), and a pair of left and right inclining slightly forward and upward with casters (6) at the lower ends, with the front surfaces of the upper ends fixed to the rear ends of both upper legs (8) It consists of rear legs (9) and (9), and the upper ends of the left and right front legs (7) are connected by a horizontal connecting rod (10) that also serves as a supporting rod for supporting the lower surface of the front end of the seat (3). Yes.

  The seat body (3) is a synthetic resin thin seat plate (11) whose center part is bent slightly downward and the left and right side parts are bent upward, and a cushion material attached to the upper surface thereof. (12), and the lower surface of the front end portion of the seat plate (11) is supported by the upper surface of the lateral coupling rod (10).

  The backrest (4) is composed of a back frame (13) having a substantially rectangular frame shape when viewed from the front and an inner back plate (14) surrounded by the back frame (14). ing. The lower part of the left and right side frames (13a) and (13a) in the back frame (13) is slightly expanded outward, and the lower end is supported by a backrest extending from the upper ends of the left and right rear legs (9). A mounting portion (13b) to the flange (15) is continuously provided downward.

  A large number of vertically slit-like openings (16) are perforated in a regular arrangement at regular intervals in the vertical and horizontal directions on the entire surface of the back plate (14), and when the seated person's back is pressed against it, the vertical direction The back plate (14) as a whole bends backward with the opening (16) lined up in the center.

  As shown in FIGS. 3 to 5 (only one is shown for left-right symmetry), the upper edge of the rear end of the left and right sides of the seat plate (11) is gradually arcuate forward as the front end is directed downward. The upward protrusion (17) whose lower side gradually widens in a side view is integrally erected by being bent in a side view, and an upper end is opened on the outer surface thereof. A concave fitting groove (18) is formed along the shape of the upward protrusion (17).

  The upward protrusion (17) has an opening below the seat plate (11), the lower part gradually widens in a side view, and the opening at the lower end is widened forward and left and right. The concave hole (19) is formed to the vicinity of the upper end.

  Insertion holes (20) and (20) for bolts (31) to be described later are formed in the upper end of the outer side piece (17a) of the upward protrusion (17) and the lower end slightly closer to the front. Further, a projecting shaft (21) for positioning the seat support bracket (28), which will be described later, projects from the lower insertion hole (20).

  FIG. 6 and FIG. 7 show an outer shape that is fitted in the concave hole (19) of the upward projecting portion (17) and is substantially complementary to the seat support bracket (28) to be described later. The fixing member (22) is a perspective view seen from the outside and the inside, and is integrally formed of a fiber reinforced synthetic resin material to which glass fiber or the like is added.

  The fixing member (22) is connected to the upper fitting portion (22a), which faces in the up-down direction and gradually expands downward in a side view, and is continuously connected to the lower end so as to extend forward and outward. It consists of a bowl-shaped lower fitting part (22b) whose left and right dimensions are made larger than that of the upper fitting part (22a), and the upper fitting part (22a) is in the upward projection (17). Similarly, the lower fitting portion (22b) is appropriately fitted to the lower end portion of the concave hole (17) at the upper portion of the concave hole (17). On the upper surface of the front end of the lower fitting part (22b), it is possible to fit in an upward recess (not shown) formed on the lower surface of the seat plate (11) at the lower part of the concave hole (17) for improving positioning and strength. The protrusion (22c) of the protrusion is provided.

  When the fixing member (22) is fitted into the concave hole (19), the lower fitting portion (22a) has a concave upper surface that protrudes forward and sideward from the lower end of the upper fitting portion (22a). It comes into contact with the lower surface of the widened step (17b) formed in the opening of the hole (19) (see FIGS. 5 and 8).

  The fixing member (22) has a hollow shape whose inner side surface is opened, and a plurality of reinforcing ribs (23) facing the up and down direction are integrally formed therein, whereby bending rigidity is enhanced.

  When the upper fitting part (22a) is fitted into the concave hole (19), the upper fitting part (22a) is aligned with the upper and lower insertion holes (20) provided in the side piece (17a) of the upward projecting part (17). Holes (24) and (24) are formed, and hexagonal holes (25) and (25) whose inner side surfaces are opened are formed in the inside so as to communicate with the upper and lower through holes (24). Nuts (26) and (26) are fitted in the hexagonal holes (25) so as not to rotate.

  The left and right upward projecting portions (17) of the seat plate (11) are attached to the left and right backrest support rods (15) so as to be vertically rotatable as follows.

  As shown in FIG. 3 and FIG. 8 (only the left side of the chair is shown for symmetry), the fitting groove (18) of the upward projection (17) is made of a metal flat plate that is substantially complementary to its shape. The seat support bracket (28) is fixed as follows. That is, after the positioning hole (29) drilled in the lower rear end of the seat support bracket (28) is fitted to the protruding shaft (21) of the side piece (17a), the side piece (17a) is inserted vertically. Bolts (31) (31) inserted through the holes (20) and the upper and lower insertion holes (30) drilled in the seat support bracket (28) so as to be aligned with the holes (20) Insert into the upper and lower through holes (24) and (24) of the fixing member (22) fitted from below into the concave hole (19), and screw into the nut (26) fitted in advance to the hexagonal hole (25). By fastening, the upper end portion is fixed in a state of protruding upward from the upper end of the upward projection (17).

  In this fixed state, the bottom end (22d) integral with the lower fitting portion (22b) of the fixing member (22) closes the lower end of the opening of the concave hole (19), and the bottom piece (22d) and the seat. The lower surface of the plate (11) is continuous with the same surface, which improves the appearance when the seat (3) is turned upward.

  (32) is a synthetic resin cover that covers the seat support bracket (28) and the head of the bolt (31), and is removable in the fitting groove (18) on the outer surface of the upward projection (17). It is inserted.

  At the upper end of the backrest support ridge (15), a support cylinder (33) that faces in the left-right direction and whose inner surface is blocked is connected to the projecting shaft (33a) on the lower surface of the upper end of the backrest support ridge (15). It is fixed by fitting and welding. A support shaft (34) and a square shaft (35) are coaxially projected on the inner surface of the support tube (33), and the support shaft (34) is fixed to the seat plate (11). The seat support bracket (28) can be turned up and down by pivotally fitting a circular hole (36) drilled in its upper end via a pair of left and right hooked bushes (37) (37) It is supported by.

  The upper outer peripheral surface of the seat support bracket (28) has a shape that matches the same surface as the outer peripheral surface of the support tube (33), thereby preventing a step between them.

  As shown in FIG. 8, the angular axis (35) includes an angular axis (35) formed on the outer surface of an axial back support member (38) having the same outer diameter as the support cylinder (33). The bolt (40), which is fitted into the complementary square hole (39) and inserted from the outside into the support cylinder (33), is inserted into the through hole (41) of the support shaft (34) and the square shaft (35). The support cylinder (33) and the backrest support member (38) are formed by threading and screwing into the screw (42) to form in the back surface of the square hole (39) in the backrest support member (38). The upper ends of the left and right flanged bushes (37) and the seat support bracket (28) are fixed to each other so as to be rotatable.

(43) is a cap fastened to the opening on the outer surface of the support tube (33).
On the upper surface of the back support member (38), a square-axis-shaped back frame mounting rod (44) is erected, and the back frame mounting rod (44) has an armrest ( 5) is mounted as follows,

  As shown in FIG. 8, the mounting portion (13b) at the lower end of the side frame (13a) of the back frame (13) has a rectangular cross section that is complementary to the back frame mounting rod (44) and has an open lower end. A mounting hole (45) is formed in the vertical direction.

  After the back frame mounting rod (44) is properly fitted in the mounting hole (45), as shown in FIG. 3, the concave groove (46) formed on the outer surface of the side frame (13a) and facing in the vertical direction. The lower mounting portion (5a) connected to the rear end of the armrest (5) is fitted to the lower end portion of the armrest, and the upper and lower two holes drilled in the inner surface of the concave groove (47) on the outer surface thereof. Insert the bolt (49) inserted into the through hole (48) through the two upper and lower through holes (50) on the back surface of the concave groove (46) in the side frame (13a), and insert it into the mounting hole (45). The fitted back frame mounting rod (44) is screwed into the two upper and lower female screw holes (51) facing in the left-right direction and tightened.

  Thus, the back frame mounting rod (44) which is substantially integrated with the back support rod (15), the back frame (13) in the back plate (4), and the armrest (5) are two bolts. Tightened together by (49).

  It should be noted that the lower end of the downward mounting portion (5a) of the armrest (5) and the lower end of the side frame (13a) are respectively provided on the upper surface of the support cylinder (33) and the back support member at the upper end of the back support rod (15). An upward arc-shaped fitting recess (52) (52) to be fitted to the upper surface of (38) is formed so as to improve the appearance after the attachment.

  The chair assembled in this way can be nested with a number of chairs stacked in the front-rear direction by flipping the rear end of the seat (3) upward about the support tube (33).

  As described above, in the chair of the above embodiment, the recessed holes (19) that open downward are formed at the rear ends of the left and right sides of the seat plate (11) that forms part of the seat body (3). A pair of left and right upward projections (17) are connected to each other, and an upper end portion of the fitting groove (18) on the outer surface is connected to a pair of left and right rear legs (9) of the leg (2). The lower end portion of the seat support bracket (28) pivotably mounted on the support shaft (34) of the support cylinder (33) provided on the integrated backrest support rod (15) is provided with a recessed hole (19 ) Is fixed by screwing the bolt (31) to the nut (26) of the fixing member (22) fitted to the seat plate (11), so the mounting part of the seat support bracket (28) to the seat plate (11) It is not exposed to the outside like

  The seat support bracket (28) and its mounting bolt (31) are covered by the cover (32), and the fixing member (22) for fixing the seat support bracket (28) to the seat plate (11) is: The upper protrusion (17) is fitted and concealed in the concave hole (19) that opens downward in the interior of the upward protrusion (17), and the lower end of the concave hole (19) is also the bottom piece (22d) of the fixing member (22). Is closed so that it is flush with the lower surface of the seat plate (11), so that the seat support is supported both in the chair use state and in the non-use state in which the seat body (3) is rotated upward. The bracket (28), the fixing member (22), and the concave hole (19) are not exposed, and the appearance can be improved.

  Further, the fixing member (22) is integrally formed with a fiber reinforced synthetic resin material in a shape complementary to the concave hole (19), and is fixed upward by the fixing member (22) and the seat support bracket (28). Since the outer side piece (17a) of the protrusion (17) is clamped by the bolt (31), the upward protrusion (17) is reinforced and the rear body (3) is The end can be firmly supported by the leg (2). Therefore, it is possible to produce a chair having a light feeling by forming the seat plate (11) thin.

  The lower fitting part (22b) of the fixing member (22) has a bowl shape whose front and rear and left and right dimensions are larger than those of the upper fitting part (22a), and its upper surface is the lower end part of the concave hole (19). Since it is in contact with the lower surface of the widened step portion (17b), the load applied to the rear portion of the seat body (3) is effectively and stably supported by the upper surface of the lower fitting portion (22b). be able to.

  In the above embodiment, the hexagonal hole (25) is formed on the inner surface of the fixing member (22), and the bolt (31) for fixing the seat support bracket (28) is attached to the nut (26) fitted in the hole. However, the fixing member (22) may be formed with a female screw hole, and the bolt (31) may be directly screwed into the female screw hole, and the nut (26) may be omitted. . At this time, the fixing member (22) may be made of metal.

It is a front view which shows one Embodiment of the chair of this invention. Similarly, it is a side view. Similarly, it is a disassembled perspective view of the attachment part to a backrest support rod of a seat body and a backrest. It is an enlarged side view of the rear part of a seat board. It is the VV line vertical front view of FIG. It is the expansion perspective view which looked at the fixing member from the outside. It is the expansion perspective view similarly seen from the inner side. It is the VIII-VIII line enlarged vertical front view of FIG.

Explanation of symbols

(1) Chair
(2) Leg
(3) Seat
(4) Backrest
(5) Armrest
(5a) Downward mounting part
(6) Casters
(7) Front legs
(8) Upper leg
(9) Rear legs
(10) Horizontal connection
(11) Seat plate
(12) Cushion material
(13) Back frame
(13a) Side frame
(13b) Mounting part
(14) Backboard
(15) Back support
(16) Opening
(17) Upward projection
(17a) Side piece
(17b) Widening step
(18) Mating groove
(19) Recessed hole
(20) Insertion hole
(21) Projection shaft
(22) Fixing member
(22a) Upper fitting part
(22b) Lower fitting part
(22c) Projection
(22d) Bottom piece
(23) Reinforcement rib
(24) Through hole
(25) Hexagon hole
(26) Nut
(28) Seat support bracket
(29) Positioning hole
(30) Insertion hole
(31) Bolt
(32) Cover
(33) Support cylinder
(33a) Projection shaft
(34) Spindle
(35) Square axis
(36) Round hole
(37) Bush with hook
(38) Back support member
(39) Square hole
(40) Bolt
(41) Through hole
(42) Female thread
(43) Cap
(44) Back frame mounting
(45) Mounting hole
(46) (47) Groove
(48) Through hole
(49) Bolt
(50) Through hole
(51) Female thread hole
(52) Mating recess

Claims (7)

  In the chair formed by supporting the rear portion of the seat body on the leg body so as to be rotatable with a support shaft facing in the left-right direction, upward projections having concave holes opened downward are formed on both left and right sides of the rear portion of the seat body. A bolt is inserted on the outer side surface of both upward projections, and the lower ends of a pair of left and right seat support brackets whose upper ends are pivotally attached to the legs with the support shafts are inserted from the outside. A chair characterized by being fixed by screwing into a female screw of a fixing member fitted in a concave hole.   The fixing member is composed of an upper fitting portion that faces in the vertical direction, and a lower fitting portion that is connected to the lower end portion of the fixing member and has front and rear and left and right dimensions larger than that of the upper fitting portion. The chair according to claim 1, wherein the fixing member and the recessed hole have shapes complementary to each other.   The chair according to claim 2, wherein the lower fitting portion has a bottom piece that closes the lower open end of the concave hole so as to be flush with the lower surface of the seat body.   The chair according to any one of claims 1 to 3, wherein the fixing member is integrally formed of a fiber reinforced synthetic resin material.   5. A fitting groove having a concave shape in a side view is provided on the outer surface of the upward projecting portion, and the lower end portion of the seat support bracket is fitted into the fitting groove and fixed by a bolt. The chair described in.   6. The chair according to claim 5, wherein the fitting groove has a shape in which the lower part gradually widens, and the lower end portion of the seat support bracket fitted to the fitting groove has a shape complementary to the fitting groove.   The chair according to claim 5 or 6, wherein a cover that covers a lower end portion of the seat support bracket and a head portion of a bolt that fixes the seat support bracket is fixed to the fitting groove.

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