JPS6110519Y2 - - Google Patents

Description

[Detailed description of the invention] This invention divides the seat board of a chair into a rear seat board and a front seat board, and when the rear seat board tilts backward, the front seat board tilts forward. This invention relates to an interlocking device that interlocks between a plate and a front seat plate.

As mentioned above, when the seat board of the chair is divided into the rear seat board and the front seat board, and the rear seat board tilts backward,
In a chair whose front seat plate tilts forward,
When the rear seat plate tilts backwards, the front end of the rear seat plate moves further rearward than before the rear seat plate tilted, widening the gap between it and the front seat plate, making it impossible to move the front seat plate back and forth. In this case, a cushion stretched across the upper surfaces of the front seat plate and the rear seat plate extends between the front seat plate and the rear seat plate, and the cushion extends between the front seat plate and the rear seat plate. In addition to being stretched by movement, which reduces the durability of the cushion, the gap between the rear seat plate and the front seat plate widens, reducing seating comfort.

The present invention provides a seat plate for a chair as described above.
In a chair that is divided into a rear seat plate and a front seat plate, and when the rear seat plate tilts backward, the front seat plate tilts forward. This problem is solved by having the front seat plate move rearward at the same time as the front seat tilts forward.

An embodiment in which the present invention is applied to a torsion bar type tilting chair will be described below. In the figure, 1 is equipped with a leg member 3 having a caster 2 at the lower part, and a tilting device 5 with a torsion bar 4 is attached to the upper end of the leg member 3. A rear seat plate 7 with a backrest 6 that is attached and tilts backward with respect to the leg member 3; and the rear seat plate 7.
A cushion 31 is provided on the upper surface of the front seat plate 8 and the rear seat plate 7, and a cushion 31 is attached to the front by means of both fasteners or the like. It is stretched so as to be latched to both the seat plate 8 and the rear seat plate 7.

The housing member 9 in the tilting device 5 includes:
The housing member 9 is formed in an upward U-shape and longitudinally longitudinally, and is fixed to the upper end of the leg member 3 via a plate-shaped bracket 10 fixed to the rear portion of the lower surface of the housing member 9.

Left and right sides 11, 1 of the housing member 9
1', there is a rear seat support 1 having an inverted L-shaped cross section.
2 and 12', respectively, and both rear seat supports 12,
12' are integrally connected to each other at their rear ends, and the rear seat plate 7 is attached to the upper surface of both rear seat supports 12, 12', while both rear seat supports 12,
12' and the housing member 9 in the horizontal direction, and the rear seat plate 7 is configured to tilt rearward about the torsion bar 4 while resisting the torsional elastic force of the torsion bar 4.

That is, in the one rear seat support 12',
A cylindrical support member 13 is fixed so as to protrude outward, and one end of a torsion bar 4 having a square cross section inserted into the cylindrical support member 13 is attached to the outer end of the cylindrical support member 13 with a bush 14. A bushing 15 made of synthetic resin is provided inside the inner end side of the cylindrical support member 13 so as to fit over the torsion bar 4, and the left and right sides 11, Cylindrical bearings 16, 17, 18 made of synthetic resin are fitted into the circular holes bored in 11' and the other rear seat support 12, respectively, and the inner diameter of each bearing 16, 17, 18 is By fitting and inserting the synthetic resin bushes 19, 20, 21, and inserting the torsion bar 4 into the square holes drilled in each of the bushes 19, 20, 21, the torsion bar 4 supports the housing member 9 and the other rear seat. It is rotatably supported relative to the body 12.

Further, a cylindrical member 22 is removably fitted onto the torsion bar 4 that protrudes outward from the other rear seat support 12, and the outer end of the cylindrical member 22 and one end of the torsion bar 4 are connected to the bush 23. An arm 24 having an L-shaped cross section is fixed at its base end to the inner end of the cylindrical member 22, and the arm 24 is fixed to the inner end of the cylindrical member 22. It extends toward the front of the housing member 9 approximately parallel to the outer surface, and an adjustment screw rod 25 with a handle is screwed into the tip of the rod from below, so that the tip of the screw 25 is pressed against the lower surface of the housing member 9. match.

As a result, when you lean your back on the backrest 6 of the rear seat plate 7, the rear seat plate 7 and the backrest 6
is configured to resist the torsional elastic force while twisting the torsion bar 4, and to tilt rearward (backward tilting motion) around the torsion bar 4.

A pair of left and right front seat receivers 26, 26' are disposed in front of the housing member 9, and the front seat receivers 26, 26' are integrally connected at their tips, and the upper surface of the front seat receivers 26, 26' is integrally connected to the While attaching the front seat plate 8, the left and right front ends of the housing member 9 are extended forward and the ends are bent inward to form the receiving piece 2.
7, 27', synthetic resin slides 28, 28' are respectively fitted onto the receiving pieces 27, 27', and the front seat receivers 26, 26' are mounted on the upper surface thereof in the front-rear direction. It is slidably mounted, and both front seat receivers 26, 2
The rear seat plate 7 is inserted into the long slot holes 29, 29' formed in the front ends of the rear seat supports 12, 12' so as to extend in the front-rear direction. When the front seat plate 8 is tilted backward, the front seat plate 8 is engaged in a bendable manner so that the front seat plate 8 tilts forward.

In this configuration, when a person sitting leans their weight on the backrest 6, the rear seat plate 7 and the rear seat supports 12, 12', which are integral with each other, move the weight backward around the torsion bar 4 against its torsional elastic force. When the rear seat support 12, 1 tilts (backward tilts)
Pins 30, 30' are pivotably bent to the front ends of the legs 2', and are slidably placed on the upper surfaces of receiving pieces 27, 27' that protrude forward from the housing member 9 integral with the leg member 3. The front seat receivers 26, 26' and the front seat plate 8 are moved backward while being tilted forward as the rear seat plate 7 is tilted rearward, as shown by the two-dot chain line in FIG. .

Therefore, due to the backward tilting of the rear seat plate 8, the gap between the rear seat plate 7 and the front seat plate 8 is widened, and the gap between the rear seat plate 7 and the front seat plate 8 is stretched over the upper surfaces of both seat plates 7 and 8. Thus, no tensile force acts on the cushion 31.

Note that the front seat receivers 26, 2 in this embodiment
6' is formed into a U-shaped cross section so as to be slidably fitted into the receiving pieces 27, 27', respectively, to prevent the front seat receivers 26, 26' and the front seat plate 8 from jumping up. It is configured.

FIG. 5 shows another embodiment, in which a front seat receiver 26'' is made of synthetic resin and is mounted on the upper surface of a receiver piece 27'' that protrudes forward from the housing member 9 attached to the upper end of the leg member 3. The rear end of the front seat support 26'' is removably and bendably attached to the front end of the rear seat support 12''.
On the other hand, a connecting rod 35 is pivotally attached to the lower front end of the rear seat support 12'' by a pin 34, and a pin 37 on the front seat support 26'' is inserted into a long groove hole 36 bored at the tip of the connecting rod 35. By engaging, the front seat receiver 26''
Furthermore, the structure is such that the front seat plate 8 does not jump up.

As described above, the present invention includes a rear seat plate attached to the upper surface of a rear seat support provided at the upper end of a leg member so as to be tiltable backward against a spring force, and a front seat plate of the rear seat plate. In a tilting chair, the chair is divided into a front seat plate attached to the top surface of a front seat receptacle located at the front seat plate, and a cushion is stretched across the top surface of both the rear seat plate and the front seat plate, The rear end of the front seat receiver is bendably connected to the front end of the rear seat support with a pin, and the part of the front seat receiver in front of the pin connection part is a receiving piece that projects forward from the leg member. The seat plate is supported slidably in the front and back direction, and as the rear seat plate tilts backward, the distance between the rear seat plate and the front seat plate increases, and both seats Since it is possible to prevent tensile force from acting on the cushion stretched across the legs, there is no reduction in sitting comfort and durability of the cushion due to backward tilting of the rear seat plate. Since it only needs to be slidably supported on the piece, the structure is extremely simple.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view of the chair, FIG. 2 is an enlarged side view of the main parts, FIG. 3 is an enlarged cross-sectional view taken from the side of FIG. FIG. 5 is a side view showing another embodiment. 1... Chair, 3... Leg member, 4... Torsion bar, 6... Backrest, 7... Rear seat plate, 8...
Front seat plate, 9... Housing member, 12, 1
2', 12''... Rear seat support, 26, 26', 2
6″...Front seat receptor, 31...Cushion, 30,
30', 33... pin, 27, 27', 27''...
Receiving piece.

Claims (1)

[Scope of utility model registration request] The seat plate of the chair is attached to the upper surface of a rear seat support provided at the upper end of a leg member so as to be tiltable backward against a spring force, and the front seat receiver is located at the front part of the rear seat plate. In the tilting chair, the chair is divided into a front seat plate attached to the upper surface, and a cushion is stretched across the upper surface of both the rear seat plate and the front seat plate. is bendably connected to the front end of the rear seat support with a pin, while a portion of the front seat receiver in front of the pin connecting portion is slidable in the front-rear direction on a receiving piece protruding forward from the leg member. An interlocking device for front and rear seat plates in a tilting chair supported by.