JP4355563B2 - Chair seat support structure - Google Patents

Description

  The present invention relates to a support structure for a chair seat.

In the seat of the chair, on the upper part of the support supported by the legs, a seat receiving frame is formed by bending the left and right sides obliquely upward, and a rail having a V-shaped cross section at the left and right side ends is provided. There is one in which the seat shell is supported so that the seat shell can be easily bent downward by fitting downward grooves that protrude from the lower surfaces of both sides of the synthetic resin seat shell into the concave groove (for example, Patent Document 1).
JP 2003-135195 A

  In the seat support structure described in the above-mentioned patent document, the lower surface of both side ends of the seat shell is supported by the left and right lays, and the lower surface excluding both sides of the seat shell and the upper surface of the seat receiving frame Since the space is formed, the seat shell may be bent too much due to the load at the time of sitting.

  In order to prevent this, it is conceivable to increase the thickness of the seat shell. However, doing so increases the material cost and makes it uneconomical. As described above, the entire structure is thin, and a plurality of reinforcing ribs facing in the front-rear and left-right directions are formed on necessary portions of the lower surface thereof to restrict excessive bending.

  However, if a plurality of reinforcing ribs facing in the front / rear / left / right direction are formed on the lower surface of the seat shell in this way, the shape of the mold for forming the seat shell becomes complicated, resulting in increased manufacturing costs and products of the seat shell. Cost increases.

  The present invention has been made in view of the above problems, and restricts excessive bending without increasing the thickness of the seat shell or providing reinforcing ribs, so that an appropriate cushioning property can be obtained. In addition, an object of the present invention is to provide a chair seat support structure capable of reducing the cost of the seat shell.

According to the present invention, the above problem is solved as follows.
(1) A seat receiving frame is provided on both sides of the upper surface of the front end portion of the support base supported by the leg rods and on the lower end portion of the back saddle standing from the rear end of the support base. the upper portion of the frame, the support structure of the seat of the chair comprising attached to受支the lower surface of the synthetic resin seat shell provided in the lower portion of the seat body, the seat support frames are mutually oriented in the lateral direction parallel None, lateral center part and the main frame of the front and rear pair attached to the front end portion upper surface and the lower end portion upper surface of the back rod of the support base, which is coupled to both end portions of the both main frames, front and rear A pair of left and right side frames each having a horizontal piece facing in a direction, and a front frame receiver and a rear frame receiver facing in the left-right direction and projecting downward at the front end and rear end of the lower surface of the seat shell, Center upper surface of the front main frame and the rear main frame And supporting a pair of left and right side frame receivers that project downward on the lower surfaces of both side portions of the seat shell and that are supported by the horizontal pieces of the left and right side frames, respectively. the frame receiving each other and fixed by screws.

(2) In the above item (1), the front frame receiver is made up of a pair of left and right, and they are separated by a dimension approximately equal to the left and right dimensions of both knees of the seated person.

(3) In the above item (1) or (2), the side frame is composed of two left and right support rods having an approximately U-shaped cross section and a horizontal piece that joins the upper ends of the opposing surfaces. And it forms integrally by press-molding a steel plate.

(4) In any one of the above items (1) to (3), a recess for receiving the seat receiving frame is provided on the lower surface of the seat shell, and each frame receiver is protruded from the lower surface in the recess.

(5) In the above item (4), an escape recess is provided on the lower surface of the front end of the recess so that the upper part of the front end of the support is fitted.

According to the first aspect of the present invention, the lower surface of the seat shell is supported by the seat receiving frame at the four positions of the front and rear frame receivers and the left and right side frame receivers. When joined to the shell, it can be restricted from being greatly bent downward as a whole, and only the central part surrounded by each frame holder, that is, the vicinity of the buttocks, is bent downward, so that an appropriate cushioning property can be obtained. It is done.
Therefore, unlike the prior art, it is not necessary to limit the bending by increasing the thickness of the entire seat shell or forming a plurality of reinforcing ribs on the lower surface, and the manufacturing cost can be reduced.

  According to the second aspect of the present invention, since the front end portion of the seat shell between the left and right front frame receivers, that is, the vicinity of both knee portions is easily bent downward, a comfortable sitting comfort can be obtained.

  According to the invention described in claim 3, since the rigidity of the side frame is increased, the support strength of the seat shell is increased.

  According to the fourth aspect of the present invention, the vertical dimension of the entire seat including the seat frame can be reduced, and the seat frame is not greatly exposed, so that the appearance is improved.

  According to the invention described in claim 5, the vertical dimension of the entire seat including the support base can be further reduced.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments that are considered to be the best 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, and FIG. 2 is a perspective view of the chair 1 as viewed from the lower front side. The rear end portion of a metal support base (4) having a generally rectangular shape in plan view is provided at the upper end so as to be horizontally rotatable.

  In the upper part of the support base (4) slightly ahead of the leg rod (2), the opposing faces of a pair of left and right back frames (5) and (5) having a substantially forward L-shape in side view are joined together. The front end of the dorsal fin (6) is pivotally supported so that it can tilt backward about the support shaft (7) facing in the left-right direction.

  A back outer shell (8) is attached to the rear surface of the back saddle (6), and a backrest (10) made of a cushion material is attached to the front surface via a back inner shell (9).

  (11) is a gas spring provided between the vicinity of the bent portion of the back rod (6) and the rear surface of the upper end of the leg rod (2).

  On the upper surface of the front end portion of the support base (4) and the front end portion upper surfaces of the left and right back frames (5) of the dorsal fin (6), a seat frame (12) has both left and right side portions of the support base (4). It is mounted so that it protrudes to the side.

  As shown in detail in FIGS. 3 and 4, the seat frame (12) includes a pair of front and rear main frames (13) and (13) made of steel pipes whose left and right side ends are slightly bent upward, It consists of a pair of left and right side frames (14), (14) whose front and rear ends are fixed to the lower surfaces of the left and right upward bent portions by welding.

Both side frames (14) are composed of two left and right support rods (15) (15) having a substantially U-shaped cross section, and a horizontal piece (16) for connecting the upper ends of the opposed upward pieces. And is integrally formed by press forming a steel plate.
The joint portion of the side frame (14) with the main frame (13) is cut out in a substantially U shape in a side view and welded so as to be fitted to the lower half portion of the main frame (13).
The left and right side frames (14) are symmetric so that they can be used in common on the left and right.

  The horizontal portions of the front and rear main frames (13) in the seat frame (12) are respectively provided on the upper surface of the front end portion of the support base (4) and the upper surface of the front end portions of the left and right back frames (5). It is pivotally supported by a U-shaped presser fitting (both not shown).

  (17) is a seat body, a seat shell (18) made of synthetic resin, an inner shell (19) (see FIG. 6), also made of synthetic resin, attached to the upper surface thereof, and this inner shell (19) And a cushioning material (20) mounted on the upper surface of the body.

  The left and right side portions of the seat shell (18) and the inner shell (19) are inclined upward at substantially the same angle as the both side portions of the seat frame (12) and include both inclined portions. A concave portion (21) that can be fitted to the seat receiving frame (12) from above is formed on the lower surface.

  Further, in the center of the lower surface on the rear side of the seat shell (18), there is a recess (22) in which the horizontal portion at the lower end of the left and right back frames (5) in the backpack (6) is accommodated. (See FIG. 5).

  (23) is a relief recess that prevents the upper surface of the front end portion of the support base (4) from coming into contact with the lower surface of the seat shell (18).

  As shown in FIGS. 3 and 5, the upper surface of the seat shell (18) is directed downward in the left-right direction at the center of the rear side of the lower surface of the seat shell (18) where the recess (21) is formed. By bulging in a concave shape, a rear frame receiver (24) with an upward U-shaped cross section whose bottom surface forms a horizontal surface is projected.

  The lower surface of the rear frame receiver (24) is supported by the upper surface of the horizontal portion of the main frame (13) on the rear side when the seat receiving frame (12) is fitted into the recess (21). ing.

  In addition, a pair of left and right short front frames having a substantially triangular cross section is formed at the boundary between the flat part and the inclined part on both the left and right sides of the lower surface on the front side of the concave part (21) of the seat shell (18). Receptacles (25) and (25) are projected.

  As shown in FIG. 7, the lower surfaces of the front frame receivers (25) are supported by the upper surface of the boundary between the horizontal portion and the upward bent portion of the main frame (13) on the front side. It is like that.

  Further, as shown in FIG. 6, the central portion of both sides of the inclined portion on the lower surface of the concave portion (21) of the seat shell (18) faces in the front-rear direction, and the upper surface of the concave portion (21) faces upward. A pair of side frame receivers (26) and (26) having a letter-shaped cross-section are projected.

  The lower surfaces of the both side frame receivers (26) are supported by the upper surfaces of the horizontal pieces (16) of the left and right side frames (14) of the seat receiving frame (12).

The size of the central part of the seat shell (18) surrounded by the front, rear, left and right frame receivers (24) to (26) is slightly larger than the size of the average buttock of the seated person. Is arranged.
In addition, the distance between the pair of left and right front frame receivers (25) is substantially equal to or larger than the left and right dimensions of both knees of the seated person.

  In order to attach the seat body (17) to the seat frame (12), the seat shell (18) in which the inner shell (19) and the cushion material (20) are assembled in advance is mounted on the recess (21) on the lower surface thereof. It is mounted on the seat frame (12).

  At this time, as described above, the lower surfaces of the front and rear frame receivers (24) to (26) of the seat shell (18) are the upper surfaces of the main frames (13) and (13) of the front and rear frames of the seat frame (12). The lower surface of the central portion of the seat shell (18) supported by the upper surfaces of the horizontal pieces (16) of the left and right side frames (14) and surrounded by the frame receivers (24) to (26), A required bending space (S) is formed between the upper surface of 12), that is, the upper surface of the horizontal portion of the front and rear main frames (13) (see FIG. 6).

  As shown in FIG. 6, the seat frame (12) and the seat shell (18) are inserted into the through holes (27) (see FIG. 4) formed in the front and rear ends of the left and right horizontal pieces (16) from below. The inserted screw (28) is screwed directly toward the side frame receiver (26) of the seat shell (18) or the through hole (29) on the lower surface of the seat shell (18) (see FIG. 3). It is fixed by being screwed into a female screw cylinder (not shown) on the inner shell (19) side, which is inserted into the inner shell (19).

  As described above, in the above-described embodiment, the seat shell (18) has the lower surfaces of the front, rear, left and right frame receivers (24) to (26) projecting from the lower surface thereof on the upper surface of the seat receiving frame (12). Since it is mounted in a supported manner, it is possible to restrict the entire seat shell (18) from being greatly bent downward when the load on the hips and both knees of the seated person is applied to the seat shell (18). The central portion surrounded by the frame receivers (24) to (26), that is, the vicinity of the buttocks, and the front end portion between the pair of left and right front frame receivers (25), that is, the vicinity of both knees, are bent spaces ( A moderate cushioning property can be obtained by bending downward within the range of S).

  Therefore, it is not necessary to limit the bending by increasing the thickness of the entire seat shell 18 or forming a reinforcing rib on the lower surface, and the manufacturing cost can be reduced.

It is a side view of the chair to which this invention is applied. Similarly, it is a perspective view of the chair seen from the front lower part. Similarly, it is a disassembled perspective view of the support base to which the seat receiving frame is attached and the seat body. It is a perspective view of a seat frame. It is the perspective view which looked at the state which fitted and mounted | worn the receiving frame to the recessed part of the lower surface of a seat shell from the downward direction. It is a center vertical front view of a seat and a seat receiving frame. Similarly, it is a longitudinal front view in the front frame receiving part.

Explanation of symbols

(1) Chair
(2) Legs
(3) Leg
(4) Support base
(5) Back frame
(6) Backpack
(7) Support shaft
(8) Back outer shell
(9) Back inner shell
(10) Back support
(11) Gas spring
(12) Seat frame
(13) Main frame
(14) Side frame
(15) Support rod
(16) Horizontal piece
(17) Seat
(18) seat shell
(19) Inner shell
(20) Cushion material
(21) (22) Recess
(23) Recessed recess
(24) Rear frame holder
(25) Front frame holder
(26) Side frame holder
(27) Through hole
(28) Screw
(29) Through hole
(S) Deflection space

Claims (5)

A seat frame is provided on the upper surface of the front end of the support base supported by the leg rods and on the lower end of the dorsal wall standing up from the rear end of the support base so as to protrude from both sides. In the support structure of the seat of the chair formed by receiving and attaching the lower surface of the seat shell made of synthetic resin provided in the lower part of the seat body,
The seat frame is parallel to each other in the left-right direction, and a pair of front and rear main frames in which a central portion in the left-right direction is attached to the upper surface of the front end portion of the support base and the upper surface of the lower end portion of the dorsal fin, A pair of left and right side frames having horizontal pieces facing in the front-rear direction , coupled to both side ends of the main frames, and projecting downward from the front end and rear end of the lower surface of the seat shell A pair of left and right front frame receivers and rear frame receivers that are supported by center upper surfaces of the front main frame and the rear main frame and projecting downward on the lower surfaces of both side portions of the seat shell. the side frame receiving facing the longitudinal direction, respectively support the horizontal plate of the left and right side frames, and the horizontal piece and the side frame receiving one another, of the chair seat, characterized in that fixed by screw support structure   2. The chair seat support structure according to claim 1, wherein the front frame receiver is composed of a pair of left and right sides, and they are spaced apart from each other by substantially the same size as the left and right dimensions of both knees of the seated person.   The side frame is composed of two left and right support rods having a substantially upward U-shaped cross section and a horizontal piece that joins the upper ends of the opposing surfaces, and is integrally formed by press forming a steel plate. The support structure of the chair seat of Claim 1 or 2.   The support structure for a chair seat according to any one of claims 1 to 3, wherein a recess for accommodating a seat receiving frame is provided on a lower surface of the seat shell, and each frame receiver is protruded from the lower surface in the recess.   The chair seat support structure according to claim 4, wherein a relief recess into which a front end upper portion of the support base is fitted is provided on a lower surface of the front end portion of the recess.

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