JP3782713B2 - Chair seat structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a support structure for a seat in a chair, and in particular, allows the seat shell to slide in the front-rear direction along the rail of the seat frame and prevents the seat shell from slipping forward from the rail of the seat frame. It relates to the structure of the chair seat.
[0002]
[Prior art]
In a swivel chair or the like, a seat is made of a metal seat frame fixed on a support base, a synthetic resin seat shell supported on both sides of the seat frame, and a seat cushion body provided thereon There is something that consists of. Since this seat shell can be integrally formed, it is suitable for mass production and is widely used because it is economical.
[0003]
[Problems to be solved by the invention]
In such a structure, if the seat shell is slidable in the front-rear direction with respect to the seat frame, it is preferable because it can be adapted to the sitting comfort of the individual occupant, but the seat shell does not fall off the seat frame. Thus, a retaining means must be provided.
Conventionally, such a retaining is made by fitting a stop member, which is a separate part, with a screw or the like after the seat shell is fitted to the seat frame. This not only increases the number of parts, but also increases the number of assembly steps.
[0004]
In view of the above-mentioned problems, the present invention has a structure in which a retaining member that prevents the seat shell from falling off the rail of the seat frame is formed on the seat shell in a simple manner, and the function of retaining the seat shell is that of the seat shell. An object of the present invention is to provide a chair seat structure that is automatically performed with the mounting.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) Rails extending in the front-rear direction are provided on both left and right sides of a seat receiving frame provided above the support supported by the legs so as to be parallel to each other and to form a groove opening upward. On the left and right sides of the lower surface of the seat shell placed on the upper side, there are provided downward ridges that slidably fit in the groove of the rail in the front-rear direction, and elastically by the rail at the rear end of the downward ridges. manner by being allowed to subservience inwardly, movable enters from the front into the groove of the rail, and by projecting rearwardly from the rear end of the groove of the rail, left and right of the groove than the downwardly projecting And a retaining member made up of a pair of left and right projecting pieces that are elastically deformable in the directions separated from each other so that the both sides of the rear end of the rail face the front side.
[0006]
(2) In the above item (1), the outer corners of both projecting pieces projecting outward from the downward protrusion are converged so as to gradually approach the outer shape of the downward protrusion toward the rear.
[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]
At the rear part of the seat shell (8), a retaining member (26) is formed as a part of the downward protrusion (16) on both the left and right sides. As shown in FIGS. 3 and 6, the downward protrusion (16) is interrupted by a certain length at the rear portion of the seat shell (8), and the retaining member (26) is formed at the interrupted portion. Is formed.
The retaining member (26) is composed of a pair of left and right projecting pieces (26a) and (26b) facing each other in the left-right direction with a space therebetween. The outer surface shape is the same shape as the cross-sectional shape of the downward projecting ridge (16), and the outer surface shape on the front end side is such that the corner portion protrudes from the corner portion of the downward projecting ridge (16). That is, the outer corners of both the projecting pieces (26a) and (26b) are inclined surfaces that converge toward the rear so as to gradually approach the outer shape of the downwardly extending ridge (16).
[0020]
Both projecting pieces (26a) and (26b) are formed by integral molding of the seat shell (8). At this time, the root portions before and after the both projecting pieces (26a) and (26b) are cut into the base portions. (27) is formed, and due to the presence of the cut (27), the two projecting pieces (26a) and (26b) are given elasticity that can be moved inward.
[0021]
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.
[0022]
When the seat shell (8) is moved rearward in this state, the rear ends of the projecting pieces (26a) and (26b) ride on the rail (12) and are gradually moved inward by the rail (12). Thus, since the rail (12) elastically follows both the projecting pieces (26a) and (26b), the downward protrusion (16) enters deep into the rail (12), and finally, as shown in FIG. As described above, when the front ends of the projecting pieces (26a) and (26b) are disengaged from the rear end of the rail (12), the projecting pieces (26a) and (26b) are elastically returned to their original positions. In this state, the outer corners of the projecting pieces (26a) and (26b) protrude outward from the rail (12), so that the rail (12) cannot be moved in the reverse direction and is prevented from coming off.
[0023]
【The invention's effect】
According to the first aspect of the present invention, the seat shell can be slid in the front-rear direction along the rail of the seat frame, and the seat shell can be prevented from coming forward from the rail of the seat frame. it can.
[0024]
Further, the retaining mechanism can be formed integrally with the seat shell as a simple structure.
[0025]
According to the second aspect of the present invention, the retaining action can be automatically performed as the seat shell is attached.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a main part of a rotary 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 vertical side view of an engaging portion between a seat receiving frame and a seat shell.
FIG. 6 is an enlarged partial perspective view of the vicinity of the rear end of one side of the seat shell in a state in which the seat shell is mounted on the seat frame, as viewed from the rear lower side.
[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
(26) Retaining member
(26a) (26b) Projection
(27) Notch

Claims (2)

Rails extending in the front-rear direction that form grooves that are parallel to each other and that open upward are provided on the left and right sides of the seat frame provided above the support base supported by the legs, and are provided on the seat frame. On both the left and right sides of the lower surface of the seat shell to be placed, there are provided downward ridges that slidably fit in the groove of the rail in the front-rear direction, and the rear ends of the downward ridges are elastically inward by the rails. by being allowed to subservience to, moveable enters from the front into the groove of the rail, and by protruding from the rear the rear end of the groove of the rail, the outside of the left and right of the groove than the downwardly projecting And a retaining member made up of a pair of left and right projecting pieces that are elastically deformable in the directions separated from each other in the left and right directions opposite to the front and rear sides of the rail. Support structure for chair seats. The structure of the chair seat according to claim 1 , wherein the outer corners of both projecting pieces projecting outward from the downward ridge are converged so as to gradually approach the outer shape of the downward ridge toward the rear .

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