JPH0449958Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to a mechanism for interlockingly swinging the seat plate and backrest of an office chair.

[Prior Art] Recently, a number of mechanisms for interlockingly rocking the seat plate and backrest of office chairs have been proposed, and some have already been put into practical use.

Therefore, in the mechanism that has been proposed so far, when the seat plate sinks due to the load applied by a person, the backrest tilts backward in conjunction with this sinking, or, In most cases, when a person rests their back on the backrest, the backrest tilts backwards and the seat sinks in conjunction with this.

[The problem that the idea attempts to solve]

However, the manner in which a person hangs on an office chair is not necessarily a posture that can be accommodated by the conventional interlocking mechanism. That is, there are various ways to sit on a chair, such as sitting on a chair in such a way that either the front or back of the seat sinks under the seat, or sitting in a way that places a large amount of weight on the backrest.

In such cases, conventional interlocking mechanisms do not operate in a corresponding manner, or even if a mechanism that can operate is provided, the structure becomes extremely complex, requiring time and effort to mold the component parts, resulting in high costs overall. Various problems have not been solved yet, such as the fact that it required a lot of effort to assemble and did not operate smoothly.

In addition, when sitting with all your weight on the rear edge of the seat plate, if the rear edge of the seat does not bend and sink downward, sitting too deep on the seat plate and leaning backwards on the chair will result in Since the entire board sinks downward using its front end as a fulcrum, the person's feet are lifted up and the chair becomes uncomfortable.

[Means to solve the problem]

The present invention was made with the objective of providing a swinging mechanism free from the above-mentioned problems, and the first configuration for solving the problem is to attach the front end to the upper end of the leg support 1 of the rotating chair. Install the catch block 2 whose side extends toward the front side of the seat plate,
The tip of a seat plate 4, on which the seat plate is attached, is pivotally connected to the elongated hole formed at the tip of the block 2 by a horizontal axis B, and between the bottom surface of this plate 4 and the top surface of the block 2. While an elastic body such as a leaf spring 5 is interposed, the lower end side of the backrest support member 6 to which the backrest is attached is formed to extend toward the lower surface side of the seat plate 4, and the seat plate plate is attached to the extension start end 61 of the support member 6. The rear end of 4 is aligned with the horizontal axis D
The extended tip 62 of the support member 6 is connected to the shaft A which is pivotally connected to the seat block 2.
A gas spring or the like is attached to the block 2 by the support member 6, and the stroke operation can be adjusted between the shaft E provided at the extended tip 62 of the support member 6 and the shaft B at the front end of the seat block 2. It is characterized by having a spring 7 installed,
In the second configuration, a seat arm member 23 whose front end side is extended toward the front side of the seat plate is attached to the upper end of the leg support 1 of the rotary chair, and a seat arm member 23 is attached to the tip of the seat arm member 23. An elongated hole C formed at the tip of the seat plate 4 to which the board is attached is pivoted by a horizontal axis B, and an elastic body such as a leaf spring 5 is installed between the bottom surface of this plate 4 and the top surface of the block 2. On the other hand, the lower end side of the backrest support member 6 to which the backrest is attached is formed to extend toward the lower surface side of the seat plate 4, and the extension start end 61 of the support member 6
The rear end of the seat plate 4 is pivotally attached to the horizontal axis D, and the extended tip 6 of the support member 6
2 is attached to the arm member 23 by a shaft A which is pivotally connected to the seat arm member 23, and a shaft E provided at the extended tip 62 of the support member 6 and a shaft at the front end of the seat arm member 23. A spring 7 such as a gas spring whose stroke operation can be adjusted is installed between the spring 7 and the spring 7B.

[Effect]

The seat plate 4 is a front end of an arm member 3 that is swingably attached to the catch block 2 about an axis A.
Alternatively, since it is attached to the seat arm member 23 by a horizontal shaft B in an elongated hole C formed at the front end of the seat plate 4, it can swing vertically about the shaft B.

With respect to the swinging seat plate 4, the extended tip portion 62 of the backrest mounting member 6, which is pivotally connected to the catch block 2 or the catch arm member 23 by the axis A, sharing the axis D, is attached to the seat plate 4. the front end of plate 4;
Since they are connected to the shaft B via the gas spring 7, the seat plate 4 and the backrest mounting member 6 swing in conjunction with the swinging of either one of them.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Figure 1 is a side sectional view of an example of the mechanism of the present invention, with no load applied to the mechanism, and Figure 2 is a side sectional view of the mechanism shown in Figure 1, with the seat plate sunk the most and the backrest mounting member at the rearmost position. 3 is a perspective view showing the overall structure of the mechanism shown in FIG. 1, and FIG. 4 is a side sectional view of the mechanism of the present invention in a state where no load is applied to the mechanism. 5 is a side sectional view of the mechanism shown in FIG. 4 when the seat plate is sunken the most and the backrest mounting member is tilted most backward; FIG. 6 is a side sectional view of the mechanism shown in FIG. 4. FIG. 3 is a perspective view showing the configuration.

In Figures 1 to 3, 1 is a pole-shaped leg support similar to the leg support of a general rotating office chair, and a gas spring (not shown) inserted into the support. This allows the height to be changed freely within a certain range. 1a is a valve rod that opens and closes the valve of this gas spring;
1b is a cross section of an operating lever for pushing down the valve rod 1a.

Reference numeral 2 denotes a seat block attached to the upper end of the pillar 1. In the example shown in the figure, the front side of the main body 2a fitted on the upper end of the pillar 1 is extended in an arm shape to form an arm portion 2b, and A horizontal bearing 2c oriented parallel to the width direction of the seat plate 4 is formed slightly forward of the central axis of the seat plate 4, and a contact surface 2d with the seat plate 4 is formed on the upper surface of the front end of the arm portion 2b. The cushion surface is made of an elastic material such as rubber or plastic and has a hemispherical shape.

Reference numeral 3 denotes an arm member formed into a substantially hairpin shape when viewed from above, and this arm member 3 is positioned so that its bent rear end side 3a surrounds the rear surface of the main body 2a of the catch block 2, and is attached to the bearing 2c. while being pivotally connected to said block 2 by a mounted shaft A;
The open front side 3b of the arm member 3 is connected to a long hole C formed in the front end side of the seat plate 4, which will be described later.
are pivotally connected to each other by an axis B.

Therefore, the seat plate 4 has a seat plate sheet on the upper surface.
It is a flat plate on which the SE is provided, and standing walls 4a are formed on both sides when viewed from the front, and an elongated hole C is formed at the front end of the standing wall 4a, and a shaft B is formed at the front end side 3a of the arm member 3. At the same time, the rear end of the plate 4 is pivotally connected by an axis D to the upper part of the front side 61 of the extension 6a of the support member 6 to which the backrest BA, which will be described later, is attached.

The seat plate 4 has an abutment surface 2 formed on the arm portion 2b of the catch block 2 on the lower surface of the front side thereof.
On the other hand, between the top surface of the tip of the arm portion 2b and the rear bottom surface of the seat plate 4, a leaf spring 5, which is curved in a gentle arc shape in the example shown in the figure, fixes one end of the spring 5.
It has been interposed by a. Although not shown,
An adjustment bolt capable of pushing the leaf spring 5 from the lower surface side of the arm 2b is screwed through the arm 2b,
The degree of warpage of the leaf spring 5 may be adjusted by rotating this bolt in the forward or reverse direction. A rotation knob is attached to the lower end of the bolt, and a contact material made of hard rubber or the like is attached to the upper end. Also,
Instead of the spring 5, other types of springs, springs, elastic bodies made of rubber, etc. may be interposed. In this case as well, it is desirable to be able to adjust the degree of repulsion of the elastic body using an appropriate adjustment mechanism.

Reference numeral 6 denotes a support member to which the backrest BA is attached, and is bent and extended so that the lower side is positioned on the lower surface side of the seat plate 4, and at this extension part 6a, the seat block 2 and the arm member are attached. The distal end side 62 of the extension portion 6a is formed in a forked shape so that the bearing 2 can be held between the bearings 2 and 3 from the outside.
c, and the shaft E is attached below it.

The support member 6 is pivotally connected to the axis A of the catch block 2 above the forked tip end 62 of the extension 6a, while the support member 6 is pivoted to the shaft A of the seat block 2 on the front side (extension starting end) of the extension 6a. side) 61 is connected to the seat plate 4 by an axis D, and a shaft E is provided below the bearing 2c, and this axis E, the tip of the seat plate 4, and the arm member A gas spring 7 is mounted on these shafts E and B between the shaft B that connects the tip of the gas spring 3 with the tip end of the gas spring 7. As a result, the backrest support member 6 is attached to the catch block 2 and the seat plate 4 in a connected manner.

Here, the gas spring 7 has its regulating valve 7a.
By opening and closing operations, the amount of protrusion of the rod 7b protruding from the cylinder can be adjusted, and thereby the degree of inclination of the seat plate 4 can be adjusted. Further, instead of the gas spring 7, a coil spring provided with a repulsive force adjustment mechanism, a stroke operation adjustment mechanism, etc. may be mounted on the shafts E and B.

An example of the mechanism of the present invention configured as described above operates as follows.

Now, when a person places a load on the seat SE of the mechanism shown in FIG. 1, the load is applied to the seat plate 4 that includes the seat SE.

In this state, the seat plate 4 is
The rear part is supported by the arm part 2b of the seat block 2 via the contact surface 2d of the tip of the arm part 2b of the seat block 2 and the rear end of the leaf spring 5. At the same time, the front end of the seat plate 4 is connected to the front end of the arm member 3, which is supported by the block 2 by the shaft A, via the elongated hole C and the shaft B, and the rear end of the seat plate 4 is The end thereof is connected via an axis D to the front side 61 of an extension 6a of the backrest support member 6, which is supported by the seat block 2 at an axis A.

As a result, the seat plate 4 is supported so as to be swingable in the direction of sinking forward and backward centering around the abutment part 2d at the tip of the arm part 2b on the catch block 2, and this swingable state is The member 3 is placed in a state in which it can swing about its axis A in either direction in front of or behind the plate 4. Here, the forward tilting movement is also damped by the contact portion 2d being pressed against the lower surface of the seat plate 4.

Therefore, the front and rear sinking and rocking of the seat plate 4 is possible because the front end of the plate 4 is connected to the arm member 3 via the shaft B, and the shaft B is connected to the tip of the gas spring 7. and an extension 6 in the backrest support member 6.
The fork-shaped extension tip side 61 of a is connected to the shaft B via a gas spring 7, and one end of this gas spring 7, that is, the front end of the seat plate 4, is connected to the elongated hole. C and the gas spring 7 via the axis B, the support member 6 to which the backrest BA is attached is tilted forward and backward about the axis A.

That is, the seat plate 4 is in contact with the arm portion 2b at the contact portion 2d.
If the plate 4 is tilted forward and sunk further forward, this forward tilting and sinking motion becomes an angular rotation action around the axis A together with the arm member 3, which causes the plate 4 to lift rearward. The sinking motion is caused by the axis E at the distal end side 62 of the extension portion 6a of the backrest support member 6 via the gas spring 7.
By pushing the part rearward and pushing the extension end side 62 of this support member 6 from the front side toward the rear, the support member 6 is moved around the axis A,
The angular rotation of the support member 6 in the counterclockwise direction about the axis A and the rearward lifting movement of the seat plate 4 correspond to the length of the tip of the seat plate 4. The hole C and shaft B will be synchronized.

On the other hand, when the seat plate 4 sinks behind the contact portion 2d of the arm member 2b, this sinking action attempts to pull the axis B of the arm member 3 upward around the contact portion 2d, and , the arm member is attached to the seat block 2 by the axis A, and the seat plate 4 and the backrest support member 6
Since the support member 6 is connected to the extension start end 61 by the axis D, the support member 6 is synchronously tilted rearward about the axis D.

At this time, the seat plate 4 tilts rearward about the axis B because the rear end wall 3 of the arm member 3
This is because the point a hits the rear surface of the main body 2a of the catch block 2 and prevents the arm member 3 from rotating angularly in the clockwise direction about the axis A.

The above-mentioned synchronous movement also occurs when the backrest support member 6 is tilted backward by applying force, and the rear side of the seat plate 4 sinks.

Next, another embodiment of the mechanism of the present invention will be described with reference to FIGS. 4 to 6. 4 to 6, the same reference numerals as in FIGS. 1 to 3 refer to the same members.

The mechanism shown in FIGS. 4 to 6 is different from the mechanism explained in FIGS. 1 to 3 by combining the catch block 2 and the arm member 3 into one part, that is, the catch arm member. In that it was unified as 23,
Unlike the mechanism shown in FIGS. 1 to 3, and due to this mechanical difference, the mechanism shown in FIGS. There are some points in which the operation of the mechanism differs from that shown in FIGS. 1 to 3. Hereinafter, another example of the mechanism of the present invention will be described, focusing on the differences in this mechanism and its operation.

In the mechanism shown in FIGS. 4 to 6, the catch arm member 23 is attached to the arm portion 2b of the catch block 2 shown in FIGS. 1 to 3 as shown in FIGS. 1 to 3. The distal end side of the arm member 3 is integrally formed, and the seat arm member 23 does not have a portion corresponding to the rear end side of the arm member 3. Also, Figure 1~
In the mechanism shown in FIG. 3, the contact surface 2d provided on the upper surface of the distal end side of the arm portion 2b of the seat block 2 is also not formed.

As a result, in the mechanism shown in FIGS. 4 to 6, the rear end side 23a of the seat arm member 23 is attached to the support column 1, while the arm is attached from this rear end side 23a toward the front side of the seat plate 4. The arm portion 23b is formed to be extended, and a shaft B is attached to the tip of the arm portion 23b.

This shaft B is connected to a notched elongated hole C formed horizontally forward on the distal end side of the seat plate 4.
This embodiment is similar to the previous embodiment in that the seat plate 4 is supported at its front end and that the distal end side of the gas spring 7 is connected.

On the other hand, the support member 6 of the backrest has its extension 6
A is pivotally connected to the seat arm member 23 by a shaft A attached to a bearing 23c, and is connected to the rear end side of the gas spring 7 by a shaft E, and this extension 6a front side 61
The point that the seat plate 4 is pivotally attached to the rear end of the seat plate 4 by a shaft D is also substantially the same as in the previous embodiment.

Furthermore, the upper surface of the distal end side of the arm portion 23 and the seat plate 4
Similar to the previous embodiment, a leaf spring 5 is inserted between the lower surfaces of the rear end side with its front end fixed to the arm portion 23 and its front end fixed 5a.

In the mechanism with the above structure, when a person sits on the seat SE attached to the upper surface of the seat plate 4, the leaf spring 5 provided on the lower surface of the seat plate 4 supports the load. When the leaf spring 5 is extended, the seat plate 4 moves towards the axis B.
It sinks toward the rear with the center at the center.

When the rear of the seat plate 4 sinks, the tip 62 of the extension 6a of the backrest support member 6, to which the rear end of the plate 4 is connected by the axis D, rotates slightly clockwise about the axis A. . This rotation is caused by an axis E located below the extension tip 62.
This acts to push the gas spring 7 forward, and at the same time acts to pull the seat plate 4 backward.

When the valve 7a of the gas spring 7 is closed, the rod 7b does not move forward or backward.
Rotation of the support member 6 about the axis A is prevented.
When the valve 7a is open, the rotation of the support member 6 about the axis A is damped, and the state shown in FIG. 5 is achieved.

The operating mode common to the above two mechanisms of the present invention is that when a force is applied behind the seat plate 4 to cause the plate 4 to sink, the backrest support member 6 moves clockwise around the axis A at its extension 6a. This is the point at which the front side (extension starting end side) 61 of the support member 6 on the axis D sinks significantly downward at the same time as the support member 6 rotates angularly in the direction.

This means that when the seat SE attached to the upper surface of the seat plate 4 is formed to extend to the upper surface portion of the extension start end side 61 of the support member 6, as shown in the figure, the rear end side of the sheet SE means that this part is bent and sinks more than the front side.

The reason why the rear end of the seat SE sinks more than the front part is because the hip point located near the rear end of the seat SE is caused by a large amount of the backrest BA, especially when sitting with the backrest BA tilted significantly backwards. Since the seat sinks in synchronization with the backward tilt, it has the advantage that the sitting posture does not become unnatural.

The constituent members of the mechanism of the present invention that operate as described above are the leaf spring 5 and the gas spring 7, which are commercially available ready-made products, and the strut 1, the seat block 2, the arm member 3, the seat plate 4, and the gas spring 7. , Since the shapes of each member such as the backrest support member 6 are simple, these members can be manufactured by metal casting, press working, etc.
It can be easily manufactured by molding synthetic resin.

[Effect of idea]

The present invention is as described above, and the seat plate is formed to be able to swing back and forth, and the support member to which the backrest is attached is operated in conjunction with the seat plate that operates in this manner. Since they are connected, it is possible to smoothly realize the inclination of the seat plate according to the posture of the person sitting on the chair and the inclination of the backrest side that corresponds to this, or the inclination of the seat plate that corresponds to the inclination of the backrest. It has the effect of being able to. Further, the mechanism for performing such an operation is simple and the number of parts is small, which is advantageous in terms of manufacturing.

Therefore, the present invention is extremely useful as an interlocking mechanism for a chair in which the depression of the seat plate and the inclination of the backrest are linked.

[Brief explanation of drawings]

Figure 1 is a side sectional view of an example of the mechanism of the present invention, with no load applied to the mechanism, and Figure 2 is a side sectional view of the mechanism shown in Figure 1, with the seat plate sunk the most and the backrest mounting member at the rearmost position. 3 is a perspective view showing the overall structure of the mechanism shown in FIG. 1, and FIG. 4 is a side sectional view of the mechanism of the present invention in a state where no load is applied to the mechanism. 5 is a side sectional view of the mechanism shown in FIG. 4 when the seat plate is sunken the most and the backrest mounting member is tilted most backward; FIG. 6 is a side sectional view of the mechanism shown in FIG. 4. FIG. 3 is a perspective view showing the configuration. 1... Support column, 2... Seat block, 3... Arm member, 4... Seat plate, 5... Leaf spring, 6
...Backrest support member, 61... Front side of support member 6 (extension start end side), 62... Extension end side of support member 6, 7... Gas spring, A, B, D,
E...Horizontal axis, C...Elongated hole, SE...Seat,
BA...Backrest.

Claims (1)

[Claims for Utility Model Registration] 1. A seat block 2 formed by extending the front end side toward the front side of the seat plate is attached to the upper end of the leg support 1 of the rotating chair, and the seat block 2 is surrounded by the seat block 2. An arm member 3, which is a formed arm-shaped member and whose rear side is pivoted to the block 2 by a horizontal axis A, is provided facing forward of the column 1, and a seat plate is attached to the tip of the arm member 3. A long hole C formed at the tip of the seat plate 4 to which the seat plate 4 is attached is pivoted by a horizontal axis B, and an elastic body such as a leaf spring 5 is interposed between the bottom surface of this plate 4 and the top surface of the block 2. On the other hand, the lower end side of the backrest support member 6 to which the backrest is attached is extended toward the lower surface side of the seat plate 4, and the extension starting end 61 of the support member 6 is aligned with an axis horizontal to the rear end of the seat plate 4. D, and the extended tip 62 of this support member 6.
, the arm member 3 is attached to the seat block 2 by a shaft A pivotally connected to the block 2,
In addition, a spring 7 such as a gas spring is installed between the axis E provided at the extended end of the support member 6 and the axis B at the front end of the arm member 3, such as a gas spring capable of adjusting the stroke movement. A rocking mechanism for the seat and backrest of the chair. 2. Attach a catch arm member 23 whose front end side extends toward the front side of the seat plate to the upper end of the leg support 1 of the rotating chair.
A long hole C formed at the tip of the seat plate 4 to which the seat plate is attached is pivotally connected to the tip of the seat plate 4 by a horizontal shaft B, and a leaf spring is connected between the bottom surface of this plate 4 and the top surface of the block 2. 5 or the like, the lower end side of the backrest support member 6 to which the backrest is attached is extended toward the lower surface side of the seat plate 4, and the extension start end 61 of the support member 6 is provided with a The rear end portion is pivotally attached to the horizontal axis D, and the extended tip portion 62 of the support member 6 is attached to the arm member 23 by the axis A that is pivotably attached to the seat arm member 23. 6. A chair characterized in that a spring 7 such as a gas spring is installed between an axis E provided at an extended tip 62 of the seat arm member 6 and an axis B at the front end of the seat arm member 23. A rocking mechanism for the seat and backrest.