JP3782712B2 - Chair seat structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a chair seat, and more particularly to a structure of a chair seat of a type that supports both sides of a synthetic resin seat shell on both the left and right sides of a seat receiving frame.
[0002]
[Prior art]
In a swivel chair or the like, a metal seat receiving frame fixed on a support base, a synthetic resin seat shell supported on both sides of the seat frame, and a seat cushion provided thereon There is a structure composed of a body. This structure is widely used because the seat shell can be integrally formed, and is suitable for mass production and is economical.
[0003]
[Problems to be solved by the invention]
However, in order to prevent the seat shell from bending too much when the seated person sits down, the thickness of the seat shell must be made sufficiently thick, which is uneconomical.
[0004]
In view of the above-described problems, the present invention is capable of restricting the bending at the time of loading while using a thin seat shell, giving an appropriate cushioning property together with the operation of the seat cushion body, and reducing the cost. The object of the present invention is to provide a chair seat structure that can be used.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) A seat shell made of synthetic resin is provided above the supporting base supported by the legs, and provided with a seat receiving frame having a groove in the front and rear direction having a V-shaped cross section on both left and right sides, and placed on the seat receiving frame. left and right on both sides lower surface is provided with a downward protrusion facing longitudinal direction having two ramp portion that at least partially engages both the slope of the groove of V-shaped cross section of the seat support frames, and the seat receiving the From the part that forms the left and right grooves of the frame, a projecting piece that extends outward from the outer edge of the frame is extended, and the support piece that has a facing portion facing the lower surface of the projecting piece projects from both the left and right sides of the lower surface of the seat shell. Set up.
[0006]
(2) In the above item ( 1 ) , front and rear ribs parallel to the downward protrusion are provided in the vicinity of the inner sides of the left and right downward protrusions on the lower surface side of the seat shell. Are provided with a plurality of left and right ribs.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an exploded perspective view showing a main part of a swivel chair with casters provided with an embodiment of the present invention. A support base (2) is rotated at the center of the upper surface of a leg (1) with casters. It is mounted freely. The back frame (3) is pivotally supported at the rear part of the support base (2) so that it can be tilted backward, the back shell (4) and the back cushion body (5) on the front, and the back outer panel ( 6) is attached.
[0008]
A seat frame (7) is mounted on the support base (2), a seat shell (8) is mounted on the seat frame (7), and a seat cushion (9) is mounted. It is attached.
[0009]
The present invention relates to a seat support structure comprising the seat frame (7) and the seat shell (8).
[0010]
2 is an enlarged perspective view of the seat receiving frame (7) as seen from above, FIG. 3 is an enlarged perspective view of the seat shell (8) as seen from below, and FIG. 4 is a seat receiving frame. It is an expanded vertical front view of the right side part in the state which assembled | attached (7) and the seat shell (8).
[0011]
As shown in FIG. 1 and FIG. 2, the seat frame (7) has two steel pipes (10) extending in the left-right direction with the central part recessed in an arcuate shape and spaced in parallel in the front-rear direction. Then, both ends of two steel connecting members (11) having a U-shaped cross section facing in the front-rear direction are welded to an intermediate portion of these steel pipes (10).
[0012]
Steel rails (12) extending in the front-rear direction forming grooves (12a) having a substantially V-shaped cross section are welded to the left and right ends of the steel pipe (10). A short flange-shaped projecting piece (13) facing outward is extended from the outer edge of the upper end of the rail (12) opened upward. Further, an inward flange-like projecting piece (14) similar to the projecting piece (13) extends from the inner edge of the upper end opened above the rail (12).
[0013]
Further, a plurality of (in the illustrated case, four) small protrusions (15) are provided on the front portion of the bottom surface of the V-shaped groove (12a) so as to protrude upward.
[0014]
The seat shell (8) shown in FIG. 3 is an integrally molded product of synthetic resin, and on its lower surface, a downward protrusion (16) extending long in the front-rear direction at positions facing the grooves (12a) on both left and right sides. Is protruding.
The downward protrusion (16) is fitted to the rail (12) of the seat frame (7), and as shown in FIG. 4, the left and right sides of the V-shaped groove (12a) of the rail (12) are inclined. It has a generally V-shaped cross section with two beveled portions (18) that at least partially engage the beveled surface (17).
[0015]
On the outside of these downward projections (16), a plurality of supports projecting inward horizontally from the lower ends of the left and right side edges (19) extending downward with a slight gap therebetween A piece (20) is integrally projected. When the seat shell (8) is attached to the seat frame (7), these support pieces (20) are slidably engaged with the lower surface of the projecting piece (13) of the seat frame (7), This prevents the shell (8) from coming off upward.
[0016]
A plurality of ribs (22) in the front-rear direction parallel to these downward protrusions (16) are formed in the vicinity of the inside of the left and right downward protrusions (16) in the seat shell (8). Further, a rib (21) in the left-right direction is also formed orthogonal to the rib (22) in the front-rear direction.
These ribs (21) and (22) are intensively distributed in the portion where the load is applied to the buttocks and both knees of the seated person.
[0017]
Furthermore, two downward protrusions (23) are integrally formed at the front portion of the seat shell (8) by interrupting the downward protrusion (16). The lower end of the lower protrusion (23) extends slightly lower than the lower end of the downward protrusion (16), and is formed on the small protrusion (15) of the seat frame (7) shown in FIGS. Engageable.
[0018]
An outwardly extending lever (24) is integrally formed on the outer side of the lower protrusion (23), and the U-shape in an inward plan view so as to surround the lever (24) and the lower protrusion (23). Since the notch (25) is formed, by operating the lever (24), the portion inside the notch (25) can be elastically bent outward and upward, and the lower protrusion (23) can be lifted upward. .
[0019]
Since the structure is as described above, the rear end (right side of the drawing) of the seat shell 8 shown in FIG. 3 is connected to the rail 12 from the front (lower left side of the drawing) of the seat receiving frame 7 shown in FIG. When the downward protrusion (16) is aligned with the groove (12a) and fitted from the front, the upper surface of the support piece (20) of the seat shell (8) is engaged with the lower surface of the protrusion (13) of the rail (12). The two slope portions (18) are partially engaged with both slopes (17) of the groove (12a) having a V-shaped cross section.
[0020]
【The invention's effect】
According to the first aspect of the present invention, even if the seat shell is thin, the groove of the rail of the seat frame and the downward protrusion of the seat shell have a V-shaped cross section so that the weight of the seated person can be reduced. When the two are added to each other, the two are strongly engaged with each other by the wedge action, the bending of the seat shell can be appropriately restricted, and the cushioning action can be given with the action of the seat cushion. Moreover, since the seat shell may be integrally molded, the cost can be reduced.
Furthermore, the lower surface of the protruding piece of the seat receiving frame and the upper surface of the supporting piece of the seat shell engage with each other, so that the seat shell can be prevented from coming off from the seat receiving frame.
[0021]
According to the invention described in claim 2, the seat shell can be reinforced according to the weight distribution of the seated person, and as a result, the seat shell can be made thin.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a main part of a swivel chair with casters provided with an embodiment of the present invention.
FIG. 2 is an enlarged perspective view of a seat frame as viewed from above.
FIG. 3 is an enlarged perspective view of a seat shell as seen from below.
FIG. 4 is an enlarged vertical front view of the right side in a state in which a seat receiving frame and a seat shell are assembled.
FIG. 5 is an enlarged longitudinal sectional side view of an engagement portion between a seat receiving frame and a seat shell.
[Explanation of symbols]
(1) Legs with casters
(2) Support base
(3) Back frame
(4) Back shell
(5) Back cushion body
(6) Back outer panel
(7) Seat frame
(8) seat shell
(9) Seat cushion body
(10) Steel pipe
(11) Connecting member
(12) Rail
(12a) Groove
(13) (14) Projection
(15) Small protrusion
(16) Downward protrusion
(17) Slope
(18) Slope part
(19) Side edge
(20) Support piece
(21) (22) Rib
(23) Lower projection
(24) Lever
(25) Cut

Claims (2)

Above and below the support supported by the legs, a seat receiving frame having a V-shaped cross-sectional groove facing the front and rear is provided on both left and right sides, and both left and right sides of the synthetic resin seat shell placed on the seat receiving frame A downwardly extending ridge facing in the front-rear direction having two slope portions that at least partially engage with both slopes of a V-shaped groove of the seat frame on the lower surface of the seat frame; A projecting piece extending outward from the outer edge of the groove is formed from the portion forming the groove, and a supporting piece having a facing portion facing the lower surface of the projecting piece is projected from both the left and right sides of the lower surface of the seat shell. The structure of the seat of the chair characterized by this. In the vicinity of the inside of the left and right downward ridges on the lower surface side of the seat shell, ribs in the front-rear direction parallel to the downward ridges are respectively projected, and a plurality of left and right ribs intersecting the ribs and the left and right ends are provided. The structure of the seat of the chair of Claim 1 provided.

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