JPH0437477Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to the structure of a tilting device for a chair, which is configured so that the seat plate and backrest of the chair can be tilted backward in conjunction with each other.

[Conventional technology]

As a means for configuring a chair so that its seat plate and backrest tilt backward in conjunction with each other,
In Utility Model Application Publication No. 59-86159 as prior art,
The seat plate is pivoted to the underframe fixed to the upper end of the pedestal column using a front support shaft so that it can freely tilt backwards, and when the seat plate is tilted backwards by a certain angle, its lower surface touches the upper end of the underframe and the seat plate is tilted backwards by a certain angle. The horizontal part of the tilting body, which is L-shaped in side view and the backrest is attached to the rear part of the seat plate, is tilted backward by a rear support shaft at the middle part along the front and rear direction. A configuration is disclosed in which the tilting body is pivoted freely and the front end of the tilting body is locked to the underframe via an intermediate support shaft.

With this configuration, the ratio of the distance between the front support shaft and the rear support shaft and the distance between the rear support shaft and the intermediate support shaft can be adjusted to an appropriate ratio of, for example, 2:1 or 3:1. By setting this value, the backward inclination angle of the seat can be made smaller than the backward inclination angle of the backrest, which prevents the phenomenon in which the thighs of a person leaning against the backrest are pushed up by the front of the seat. By reducing
This has the advantage of improving the rocking function of the chair.

[The problem that the idea attempts to solve]

However, as in this prior art, if the backward tilting of the seat plate and the backrest are completely linked, the stability of the seat plate is low when a person leans deeply into the backrest, and the seat plate becomes unstable. There was a problem that the functions were still insufficient.

In other words, when a person is leaning deeply against the backrest, it is undesirable for the seat plate to tilt excessively in response to changes in the seated person's posture. However, in this prior art, when the backrest tilts backwards, the seat plate also tilts backwards, and when the backrest stops tilting backwards, the backrest also stops tilting backwards. As mentioned above, the tilting of the seat and the backrest are perfectly linked, so when a person who is leaning heavily on the backrest moves his or her upper body slightly back and forth, the backrest and seat will tilt at the same time. As a result, the tilting of the seat plate reacts excessively to changes in the posture of the seated person, which reduces the stability of the seat plate when the person is leaning deeply against the backrest, making the seat even less comfortable. It was hot because it decreased.

The object of the present invention is to provide a chair tilting device that provides improved sitting comfort when leaning deeply against the backrest, in other words, the rocking function is further improved.

[Means to solve the problem]

In order to achieve this purpose, the present invention is such that the seat plate is pivoted to the underframe fixed to the upper end of the pillar of the chair so as to be tiltable backwards about the horizontal axis, and A support member is pivotally attached to the portion of the seat plate with a pin extending substantially parallel to the horizontal axis, and the lower surface of the seat plate comes into contact with the seat plate when the seat plate is tilted backward by a certain angle, and A tilting body to which a backrest is attached is installed, and a supporting portion provided on the upper surface of a rear portion of the tilting body is configured to abut and support the rear portion of the lower surface of the seat plate so as to be slidable back and forth, and the tilting body The maximum backward tilt angle of the body is set at an angle at which the tilting body can further tilt backward by a certain angle after the lower surface of the seat plate comes into contact with the support, while between the underframe and the support,
A structure is adopted in which spring means is provided to elastically support the backward tilting movement of the tilting body.

[Functions and effects of the idea]

In this configuration, when a person's weight acts on the support portion of the tilting body through the seat plate, the tilting body and the backrest attached to it tilt backward against the elasticity of the spring means, causing the tilting body to tilt backward. When the support part moves downward, the seat plate slides on the upper surface of the support part in the tilting body and tilts backward in conjunction with the backrest.

In this case, the supporting part of the tilting body and the supported part of the seat plate supported by the tilting body move downward by the same amount, while the pivoting part (horizontal axis) of the seat plate with respect to the underframe is Since it is located forward of the pivot point of the body, the tilting body tilts back at a greater rate than the seat plate.

When the seat plate tilts backward by a certain angle, the seat plate comes into contact with the upper surface of the support and cannot be rotated any further, but the tilting body can further tilt backward by a certain angle, so that the seat plate While held in such a manner that they cannot be tilted back, the backrest and the support can be tilted further back to a certain extent against the elasticity of the spring means.

In other words, within the range in which the seat plate tilts backwards, the seat plate and the backrest tilt backwards differentially, and after the seat plate has tilted backwards to the maximum limit, the position of the seat plate remains unchanged. Only the backrest can be tilted backwards within a certain range against the spring means.

As described above, according to the present invention, only the backrest can be tilted backward against the spring means while the posture of the seat remains unchanged while the person is leaning deeply against the backrest. This has the effect of preventing the seat plate from overreacting to the person's posture and significantly improving the comfort of sitting on the chair.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

In the figure, reference numeral 1 indicates a chair, and an upward open box-shaped underframe 3 is attached to the upper end of the pillar 2 of the chair 1.
are fixed to the left and right side plates 4, 4 of the underframe 3.
By passing the horizontal shaft 5 through a bracket 6a formed at a front end of the seat plate 6 and a bracket 6a formed at a front end end of the seat board 6, the seat board 6 is pivotally mounted at the front end end thereof so as to be tiltable rearward. A cushion body 24 is stretched over the upper surface of the seat plate 6.

A downward U-shaped support 8 when viewed from the front is disposed at a portion rearward of the horizontal axis 5 of the portion sandwiched between the left and right side plates 4, 4 of the underframe 3, and the front end of this support 8 By pivotally attaching the leaning portion to the side plate 4 of the underframe 3 with pins 7, 7, the support body 8 is configured to freely tilt backward around its front end.

When the upper surface plate 9 of the support body 8 is projected above the underframe 3 and the seat plate 6 is tilted backward by a certain angle,
The lower surface of the seat plate 6 is brought into contact with the support body 8. Further, both left and right ends of the support shaft 10 attached to the left and right side plates of the support body 8 are connected to the left and right side plates 4 of the underframe 3,
4, and between this support shaft 10 and the horizontal shaft 5,
A gas spring 12, which is an example of a spring means, is mounted to elastically support the backward tilting movement of the support body 8.

Reference numeral 14 indicates a tilting body for attaching the backrest 13. The tilting body 14 has an upwardly U-shaped cross section and an L-shape in side view. While it is fixed,
The tip of the horizontal portion 14 of the tilting body 13 is locked to the left and right side plates of the support body 8 with pins 17, and is fixed to the lower surface of the upper surface body 9 of the support body 8 with bolts 16. is configured to tilt integrally with the support body 8. In this case, bolt 1
6 may be omitted and the backrest 13 may be configured to be able to tilt forward independently.

A stay-shaped support portion 18 that supports the lower surface portion of the seat plate 6 near the rear end is formed in the middle of the horizontal portion 15 of the tilting body 14 along the front-rear direction. The seat plate 6 slides on the support portion 18 by drilling a locking groove 19 and permanently locking the connecting pin 20 inserted into the locking groove 19 with respect to the seat plate 6. The tilting body 14 is configured to be freely supported, and after the seat plate 6 comes into contact with the upper surface of the support body 8, the tilting body 14 can further tilt backward by a certain angle. The connecting pin 20 is fitted with a spring 21 that biases the support portion 18 and the seat plate 6 in the direction of overlapping each other.

Note that the gas spring 12 is connected to the cylinder 2.
The piston rod 23 is inserted into the piston rod 2, and a push valve protrudes from the tip of the piston rod 23. When the push valve is pressed by an operation lever (not shown), the locked state is released, and the piston rod 23 can freely move in and out of the cylinder 22. If the external force acting on the cylinder 22 is greater than the internal gas pressure, the piston rod will be pushed in, and if the external force acting on the cylinder 22 is less than the internal gas pressure, the piston rod will protrude. Then, when the push valve is in the protruding state, the piston rod 2
3 is held at the set position, the initial posture of the seat plate 6 and the backrest 13 is defined, and in this state, the piston rod 23 moves backward within a certain range against the internal pressure of the cylinder 22. .

In the above configuration, when the seated person leans back against the backrest 13, the weight of the seated person acts on the seat plate 6, so that the tilting body 14 and the support body 8 tilt backward around the pins 7, 7. Interlockingly, the seat plate 6
While sliding on the upper surface of the support part 18 in the tilting body 14, the tilting body 14 tilts backward about the horizontal axis 5, while the support shaft 10 attached to the support body 8
It moves forward along the guide hole 11 against the elasticity of the tilting body 14 and the seat plate 6, thereby elastically supporting the backward tilting movement of the tilting body 14 and the seat plate 6.

In this case, since the rear part of the seat plate 6 is supported by the support part 18, as shown in FIG. have the same dimension H, while the horizontal axis 5, which is the rotation axis of the seat plate 6, and the tilting body 1
The position of the pin 7, which is the rotation axis of the horizontal axis 5, is shifted in the front-rear direction, and the ratio (α:β) between the rotation angle α of the seat plate 6 and the rotation angle β of the tilting body 13 is distance L1 from pin 7 to support part 18
(L1:L2) is the reciprocal of the ratio of distance L2 to
).

Then, when the seat plate 6 tilts backward to a certain angle,
Since the lower surface of the seat plate 6 comes into contact with the upper surface of the support body 8, the seat plate 6 cannot be tilted back any further. As shown by the chain line, the supporting portion 18 can further tilt backward by a certain angle θ until the connecting pin 20 restricts the downward movement of the supporting portion 18 .

Therefore, when the seated person leans heavily on the backrest 13 and further tilts the upper body back, the seated person can tilt only the backrest 13 backward while keeping the posture of the seat plate 6 unchanged. Since the seat plate 6 does not tilt excessively in response to changes in the person's posture when the person is leaning deeply on the chair 13, the comfort of sitting on the chair can be significantly improved.

Note that the support portion 18 of the tilting body 14 and the seat plate 6 can be separated in the vertical direction, so that when the seated person leans his or her body forward, only the seat plate 6 tilts forward while the backrest 13 remains stationary. Therefore, the seat plate 6 is
It also has the advantage that it can be tilted forward regardless of the presence of the gas spring 12.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side sectional view of the main part, FIG. 2 is a perspective view of the main part, FIG. 3 is a side view of the chair, and FIG. 4 is a schematic side view showing the operation. It is. 1...chair, 2...pedestal, 3...underframe, 5...
horizontal axis, 6... seat plate, 7... pin, 8... support body, 12... gas spring as an example of spring means, 13... backrest, 14... tilting body, 15
...Horizontal part, 18...Support part, 20...Connecting pin.

Claims (1)

[Scope of utility model registration request] A seat plate is pivotally attached to an underframe fixed to the upper end of the leg column of the chair so as to be tiltable backwards about a horizontal axis, and the seat plate is attached at a certain angle to a portion of the underframe behind the horizontal axis. A support body that is brought into contact with the lower surface of the seat plate when it is tilted backwards is pivoted by a pin extending substantially parallel to the horizontal axis, and a tilting body to which the backrest is attached is attached to the support body, A support portion provided on the upper surface of a rear portion of the tilting body is configured to abut and support the rear portion of the lower surface of the seat plate so as to be slidable back and forth, and the maximum rearward tilting angle of the tilting body is set to The tilting body is set at an angle that allows the tilting body to further tilt backward by a certain angle after the lower surface of the plate comes into contact with the support, while elastically supporting the backward tilting of the tilting body between the underframe and the support. A tilting device for a chair, characterized in that it is provided with a spring means for tilting the chair.