JP4594849B2 - Chair - Google Patents

Description

  The present invention relates to a chair formed by supporting a rear portion of a seat body so as to be pivotable upward by a leg body.

This type of chair is described in Patent Document 1, for example, and is well known.
Japanese Patent Laid-Open No. 2001-128776

  The chair described in the above-mentioned Patent Document 1 is pivotally attached to the threaded portion so as to protrude from the upper surface of the left and right rear legs and the rear end of the seat support bracket together with the bracket cover by a bolt. In addition, the seat support bracket and the bracket cover are fixed to the lower surface of the seat frame with screws, and the backrest is also installed separately from the seat support bracket and bracket cover. Therefore, there are many assembly steps and work efficiency is poor.

  The present invention has been made in view of the above problems, and the rear portion of the seat body is simply supported by a backrest support rod provided on the leg body so as to be pivotable upward, and the backrest can be easily attached. It is an object of the present invention to provide a chair that can reduce the number of assembly steps and improve the work efficiency.

According to the present invention, the above problem is solved as follows.
(1) In a chair that supports the rear part of the seat body so as to be pivotable upward by the legs, a pair of left and right backrest support ridges are provided at the rear part of the legs to support both backs. A pair of inward left and right support shafts projecting from the opposite surface of the support body facing the left and right direction fixed to the upper end of the collar, and the support pieces projecting upward on both left and right sides of the rear part of the seat body A backrest mounting member that pivotally fits up and down and attaches both right and left sides of the backrest to the inner ends of the both support shafts. The body support piece is clamped and fixed with screws.

(2) In the above item (1), an upward mounting rod that fits the lower ends of the left and right sides of the backrest is connected to the upper surface of the backrest mounting member.

(3) In the above item (1) or (2), a non-circular shaft is provided at the inner end of the support shaft, and the non-circular shaft is provided on the outer surface of the back support member. The support body and the backrest support member are fixed with screws by fitting into a complementary non-circular hole.

(4) In any one of the above items (1) to (3), the support piece of the seat body is an upward protrusion projecting on both sides of the seat body and a flat plate-like surface facing upwards fixed to the outer surface thereof. It shall consist of a seat support bracket, and the upper end of this seat support bracket is pivotally fitted to a spindle.

(5) In the above item (4), the upper outer peripheral surface of the seat support bracket is aligned with the outer peripheral surfaces of the support and the backrest support member.

(6) In the above item (4) or (5), the lower end portion of the seat support bracket is fitted into a concave fitting groove formed on the outer side surface of the upward projecting portion so as to project upward from the outer side. It is fixed with bolts screwed into the part.

(7) In the above item (6), the seat support bracket and the head of the bolt are covered with a cover.

(8) In any one of the above items (4) to (7), a concave hole that opens downward or upward is formed inside the upward protrusion, and a bolt for fixing the seat support bracket is formed in the concave hole. A fixing member having a female thread portion into which is screwed is inserted.

According to the first aspect of the present invention, the support pieces projecting from the left and right sides of the rear part of the seat body are pivoted so as to be rotatable about the inward support shaft of the support body facing the left and right direction of the upper end of the back support rod. The back end of the seat body is moved up and down to the back support rod provided on the leg body by simply holding the support piece between the back support member and the support body that are fitted and fixed to the inner end of the support shaft with screws. Therefore, the number of steps for assembling the seat body can be reduced, and the work efficiency can be improved.
Further, both side portions of the rear end of the seat body are stably and well supported by being sandwiched between the left and right support bodies.

  According to the second aspect of the present invention, the backrest can be substantially backrested by merely fitting the lower end portions of the left and right sides thereof to the mounting rod of the backrest support member fixed to the support body with screws from above. Since it can be easily attached so as to be integrated with the support rod, the work efficiency is improved.

  According to the third aspect of the present invention, the non-circular shaft protrudes from the inner end of the support shaft, and is fitted into the non-circular hole of the back support member, so that the back support effect of the back support member can be reduced. It becomes large and can support the backrest stably. In addition, since the support shaft and the non-circular shaft are integrated, the seat body can be rotatably supported by one shaft, and the backrest support member can be firmly fixed and prevented from rotating. Therefore, complicated support means and fixing means are not required.

According to the invention described in claim 4, since the support piece is reinforced with a double structure by the upward protrusion and the seat support bracket, the support strength of the seat body is increased.
Further, since the rear end portion of the seat body is separated below the support shaft and is supported in a suspended state by the seat support bracket, the rear portion of the seat body is stabilized at the time of sitting. Furthermore, when the seat is rotated upward, the rear end portion is separated from the front surface of the backrest and does not interfere with each other. Therefore, the seat can be rotated largely upward, and nesting can be performed. It can be done efficiently.

  According to the fifth aspect of the present invention, no step is formed between the upper outer peripheral surface of the seat support bracket and the outer peripheral surfaces of the support and the backrest support member, so that they present a sense of unity and improve the appearance. .

  According to the sixth aspect of the present invention, since the wobbling of the seat support bracket in the front-rear direction is reliably prevented, the seat body can be stably supported.

  According to the seventh aspect of the invention, the seat support bracket and the head of the bolt are hidden by the cover, so that the appearance is improved.

  According to the invention described in claim 8, since the side piece outside the concave hole in the upward projecting portion is sandwiched and reinforced by the fixing member and the seat support bracket and is tightened by the bolt, the seat body is thin. Even so, the seat support bracket can be firmly fixed to the upward projection.

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) includes a leg body (2) made of a pipe, a seat body (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 composed of a synthetic resin seat plate (11) and a cushion material (12) attached to the upper surface of the seat plate (11). Supported by the top surface.

  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.

  The rear end of the seat plate (11) of the seat body (3) is attached to the left and right backrest support rods (15) so as to be rotatable in the vertical direction as follows.

  As shown in the exploded perspective view of FIG. 3 and the enlarged vertical sectional view of FIG. 4 (only one is shown for left and right symmetry), the left and right sides of the rear end of the seat plate (11) are opened inside and downward. A pair of upward projections (18) having an upward concave hole (17) is integrally erected, and the outer surface of the outer side piece (18a) has a vertical direction with an upper end opened. An inward concave fitting groove (19) is formed.

  In the fitting groove (19), the lower end of a metal plate seat support bracket (20) that complements the fitting groove (19) has two upper and lower through holes (20a) drilled in the side piece (18a). Insert the bolt (22) from the outside into (18b), and insert its tip into the through hole (23a) of the fixing member (23) made of hard synthetic resin inserted from below into the concave hole (17). The upper end is positioned above the upper end of the upward projecting portion (18) by screwing into a nut (25) that is fixed in the hexagonal recess (24) formed on the inner surface of the recessed portion. It is fixed in a protruding state.

  The upward protrusion (18) and the seat support bracket (20) constitute a support piece (21) that supports the rear end of the seat (3) (see FIGS. 1 and 2).

  The lower end of the fixing member (23) is in contact with the lower surface of the outer side piece (18a) of the upward protrusion (18), and the lower end of the opening of the concave hole (17) is connected to the seat plate (11). A closing piece (23b) that is well-dressed to be continuous with the lower surface is integrally provided continuously.

  (26) is a synthetic resin cover that covers the outer surface of the seat support bracket (20) and the head of the bolt (22). The shaft-shaped protrusion (26a) projecting from the inner surface of the cover is made of a seat support bracket. By being fitted into the mounting hole (27) between the upper and lower through holes (20a) in (20), it is fixed so as to be fitted in the fitting groove (19).

  At the upper end of the backrest support ridge (15), a support cylinder (28) that faces in the left-right direction and whose inner surface is blocked is attached to the lower shaft of the lower support shaft (28a). It is fixed by fitting and welding. The support shaft (29) and the square shaft (30) are integrally projected on the inner surface of the support tube (28), and the support shaft (29) is fixed to the seat plate (11). The seat support bracket (20) can be turned up and down by pivotally fitting a circular hole (31) drilled in its upper end via a pair of left and right hooked bushes (32) (32) It is supported by.

  The outer peripheral surface excluding the lower portion of the seat support bracket (20) has a shape that matches the same surface as the outer peripheral surface of the support tube (28), thereby preventing a step between them.

  The angular axis (30) is formed on the outer surface of a shaft-like back support member (33) having the same outer diameter as the support cylinder (28), and a rectangular hole (30) is complementary to the angular axis (30). 34), and the bolt (35) inserted from the outside into the support tube (28) passes through the through hole (36) of the support shaft (29) and the square shaft (30) to support the backrest. The support tube (28) and the backrest support member (33) are formed between the facing surfaces of the support tube (28) and the back support member (33) by being screwed into the screw (37) to be formed on the back surface of the square hole (34) in the member (33). The left and right hooked bushes (32) and the upper end of the seat support bracket (20) are fixed to each other so as to be sandwiched in a rotatable manner.

(38) is a cap fastened to the opening on the outer surface of the support tube (28).
On the upper surface of the back support member (33), a square-axis-shaped back frame mounting rod (39) is erected, and the back frame mounting rod (39) has an armrest ( 5) is mounted as follows,

  As shown in FIG. 4, 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 (39) and that opens at the lower end. A mounting hole (40) is formed in the vertical direction.

  After the back frame mounting rod (39) is properly fitted into the mounting hole (40), as shown in FIG. 3, the concave groove (41) 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 back surface of the concave groove (42) on the outer side surface thereof. Insert the bolt (44) inserted into the through hole (43) through the two upper and lower through holes (45) on the back surface of the concave groove (41) in the side frame (13a), and insert it into the mounting hole (40). The fitted back frame mounting rod (39) is screwed into two upper and lower female screw holes (46) facing in the left-right direction and tightened.

  Accordingly, the back frame mounting rod (39) 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 with (44).

  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 (28) at the upper end of the backrest support rod (15) and the backrest support member. An upward arc-shaped fitting recess (47) (47) to be fitted to the upper surface of (33) is formed so that the appearance after the attachment is improved.

  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 (28).

  As described above, in the above-described embodiment, the upward projections (8) projecting on the left and right sides of the rear end of the seat plate (11) constituting the seat (3) face upward. The lower end of the seat support bracket (20) is fixed so as to be substantially united with a screw, and the circular hole (31) drilled in the upper end is simply fixed to the upper end of the backrest support rod (15). The support cylinder (28) and the back support member (33) fastened to the support cylinder (28) and bolts (35) are pivotally fitted to the support shaft (29) of the support cylinder (28) facing left and right. Therefore, the work of supporting the rear end of the seat body (3) on the backrest support rod (15) so as to be rotatable is simplified, and the work efficiency is improved.

  In addition, a back frame mounting rod (39) is erected on the upper surface of the back support member (33) fixed to the support tube (28), and the side frame (13a) of the back frame (13) The backrest (4) can be easily attached to the backrest support ridge (15) simply by fitting the lower end portion and fixing it with bolts (44) from the outside.

The present invention is not limited to the above embodiment.
In the above embodiment, the nut (25) is fitted into the recess (24) on the inner surface of the fixing member (23) inserted into the recess (17) in the upward protrusion (18) of the seat plate (11), A bolt (22) for fixing the seat support bracket (20) is screwed into this nut (25), but the fixing member (23) is made of metal, and a female screw hole is drilled in it. The bolt (22) may be directly screwed into the hole.

  Further, a concave hole opening upward may be provided in the upward projecting portion (18), and a fixing member having a female screw hole may be inserted into the concave hole from above.

  The vertical dimension of the upward projection (18) of the seat plate (11) is slightly increased, and the left and right dimensions are thin, and a circular hole drilled in the upper end is formed on the support shaft (29 ), The seat support bracket (20), the fixing member (23), the cover (26), etc. may be omitted.

The means for fixing the support cylinder (28) and the backrest support member (33) is not a square shaft (30), but a nut is screwed onto the protruding end of the screw shaft that passes through the backrest support member (33). Both members may be fixed together, or the support shaft (29) is provided with a female screw whose inner end opens, and the bolt inserted into the female screw from the inside of the back support member (33) Both may be fixed by screwing.
Of course, the present invention can be applied to a chair without an armrest (5).

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 attaching part to the backrest support collar of a seat and a backrest. It is the IV-IV line expansion 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) Recessed hole
(18) Upward protrusion
(18a) side piece
(18b) Through hole
(19) Mating groove
(20) Seat support bracket
(20a) Through hole
(21) Support piece
(22) Bolt
(23) Fixing member
(23b) Blocking piece
(24) Recess
(25) Nut
(26) Cover
(26a) Shaft-shaped protrusion
(27) Mounting hole
(28) Support cylinder (support)
(28a) Projection shaft
(29) Spindle
(30) Square axis (non-circular axis)
(31) Round hole
(32) Bush with hook
(33) Back support member
(34) Square hole (non-circular hole)
(35) Bolt
(36) Through hole
(37) Female thread
(38) Cap
(39) Back frame mounting rod
(40) Mounting hole
(41) (42) Groove
(43) Through hole
(44) Bolt
(45) Through hole
(46) Female thread hole
(47) Mating recess

Claims (8)

  In a chair that supports the rear portion of the seat body so as to be pivotable upward by the legs, a pair of left and right back support rods facing upward are provided at the rear portion of the legs, and the upper ends of both back support rods A pair of inwardly facing left and right support shafts are projected on opposite surfaces of the support body facing left and right, which are fixed to the left and right, and support pieces that are projected upward on both left and right sides of the rear part of the seat body are vertically A backrest mounting member that pivotably fits and attaches both right and left sides of the backrest to the inner ends of the both support shafts is supported by the outer surface and the inner surface of the support body. A chair characterized by holding a piece and fixing it with screws.   The chair according to claim 1, wherein an upward mounting rod that fits the lower ends of the left and right sides of the backrest is connected to the upper surface of the backrest mounting member.   A non-circular shaft protrudes from the inner end of the support shaft, and this non-circular shaft is fitted into a non-circular hole that complements the non-circular shaft provided on the outer surface of the back support member and supported. The chair according to claim 1 or 2, wherein the body and the back support member are fixed with screws.   The seat support piece is composed of an upward projection projecting on both sides of the seat body and a flat seat support bracket facing upward that is fixed to the outer surface of the seat support bracket, and supports the upper end of the seat support bracket. The chair according to any one of claims 1 to 3, wherein the chair is pivotally fitted to a shaft.   The chair according to claim 4, wherein the outer peripheral surface of the upper part of the seat support bracket is aligned with the outer peripheral surface of the support and the backrest support member.   5. A lower end portion of the seat support bracket is fitted into a concave fitting groove formed on the outer side surface of the upward projecting portion and fixed by a bolt screwed into the upward projecting portion from the outer side. Or the chair of 5.   The chair according to claim 6, wherein the seat support bracket and the head of the bolt are covered with a cover. A concave hole that opens downward or upward is formed inside the upward protrusion, and a fixing member having a female thread portion into which a bolt for fixing the seat support bracket is screwed is inserted into the concave hole. The chair according to any one of claims 4 to 7.

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