JP2000050994A - Chair tilting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of abnormal sound and uncomfortable sound by mounting a spindle to one of a supporting member and a tilting member in the state of being non-rotatable and mounting the spindle to the other member through a synthetic resin bearing tool concerning pivotally supporting part pivotally supporting the tilting member to the supporting member. SOLUTION: This metallic supporting member 4 is mounted to a leg part and a metallic tilting member 5 provided with a seat part and a back rest part is pivotally supported to the member 4 by the pivotally supporting part in the state of being capable of tilting against the elastic energizing force of a compressed coil spring. Concerning the part 6, the spindle 12 is mounted to one of the supporting member 4 and the tilting member 5 in the state of being non-rotatable and the spindle 12 is rotatably mounted to the other member through the synthetic resin bearing tool 13 to restrict a part sliding with the spindle 12 between with the tool 13 by the tilting operation of the member 5 with respect to the member 4. Thus, the generation of abnormal sound and uncomfortable sound is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilting device for a chair, and more particularly to a tilting device for a chair in which a backrest or a backrest and a seat tilt with respect to a leg.

[0002]

2. Description of the Related Art Conventionally, a metal tilting member provided with a seat and a backrest is mounted on a metal supporting member attached to a leg so as to be tiltable against the elastic biasing force of a compression coil spring. Various chairs have been provided in which the backrest or the backrest and the seat tilt relative to the legs.

[0003] Usually, in such a tilting device for a chair,
The structure of the pivoting portion of the tilting member with respect to the support member is such that a metal support shaft is penetrated through a shaft hole provided in the overlapping portion of both members to support the shaft, and furthermore, a composite is formed between the overlapping portions of both members around the shaft hole. Since it has a structure with a resin spacer interposed, when the tilting member is tilted about the support shaft with respect to the support member,
Abnormal sound or unpleasant sound due to friction between metals may occur between the support shaft and one or both shaft holes. Conventionally, in order to prevent the occurrence of an abnormal sound or an unpleasant sound due to the rubbing between metals, bearings made of synthetic resin have been attached to the shaft holes of both the support member and the tilting member.

On the other hand, a compression coil spring is disposed vertically between the support member and the tilting member and away from the pivot, and the lower end of the compression coil spring is placed on the support member. At the same time, the abutting portion of the tilting member or a member connected to the tilting member is mounted on the upper end of the compression coil spring, and has an elastic resistance to the downward displacement of the tilting member. When the tilting member is tilted backward, the contact portion is displaced along a locus on a circle centered on a pivot, and the compression coil spring expands and contracts only in the direction of its spring axis. The upper end of the spring slides, and the rubbing causes an abnormal sound or an unpleasant sound.

[0005]

SUMMARY OF THE INVENTION In view of the above situation, the present invention is directed to a metal tilting member in which a seat and a backrest are provided on a metal supporting member attached to a leg. In a chair in which the member is tiltably pivoted against the elastic biasing force of the compression coil spring, and the backrest portion or the backrest portion and the seat are tilted with respect to the legs, the pivoting portion of the tilting member with respect to the support member, A point of providing a tilting device for a chair for preventing an abnormal sound or an unpleasant sound from being generated at a contact portion with a compression coil spring and realizing a smooth tilting of a backrest portion or a backrest portion and a seat portion. is there.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a compression coil including a metal tilting member provided with a seat portion and a backrest portion on a metal support member attached to a leg portion. What is claimed is: 1. A chair tilting device pivotally supported in a tiltable manner against an elastic biasing force of a spring, wherein a pivoting portion pivotally supporting the tilting member on the support member is rotated by one of the support member and the tilting member. A tilting device for a chair is provided in which a support shaft is immovably mounted and the support shaft is rotatably mounted on the other member via a synthetic resin bearing.

Further, according to the present invention, a metal tilting member provided with a seat portion and a backrest portion on a metal supporting member mounted on a leg portion can be tilted against the elastic biasing force of a compression coil spring. A tilting device for a pivotally supported chair, wherein a lower end of the compression coil spring is attached to the support member, and a slider having an upper surface as a sliding surface is attached to an upper end of the compression coil spring. A horizontal axis pin provided on the lower surface side is brought into contact with the sliding surface of the slider, and the tilting device of the chair is configured such that the axis pin slides forward and backward on the sliding surface of the slider with the tilting of the tilting member. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 shows a typical embodiment of a chair employing the tilting device of the present invention, FIG. 2 is a conceptual diagram of a basic configuration, and FIGS. 3 to 5 show main parts of the first invention. Legs, 2 is a seat, 3 is a backrest, 4 is a leg
Reference numeral 5 denotes a tilting member for supporting the seat 2 and the backrest 3, reference numeral 6 denotes a pivotal support, and reference numeral 7 denotes a compression coil spring.

The chair tilting device according to the present invention comprises a metal support member 4 attached to a leg 1, a seat 2 and a backrest 3.
Is premised on a structure in which a metal tilting member 5 provided with is pivotally supported by a pivot support 6 so as to be tiltable against the elastic biasing force of a compression coil spring 7. The pivoting member 6 pivotally supports the tilting member 5 at the front side of the seat portion 2 with respect to the support member 4, and a compression coil spring 7 is provided between the supporting member 4 and the tilting member 5 behind the pivotal portion 6. Is interposed.

The support member 4 is a substantially box-shaped member which is formed by processing a steel plate and is opened upward.
Side plates 9 and 9 which stand up on both sides. The tilting member 5 is also a substantially box-shaped member which is formed by processing a steel plate material and is opened downward, and is set to have a size so as to cover the support member 4 from above. Cover plates 11, 1 hanging on both sides of 10
1 is formed. The two cover plates 1 of the tilting member 5 are provided outside the both side plates 9 and 9 of the support member 4.
1, 11 are covered so that they may overlap.

First, according to a first aspect of the present invention, as shown in FIGS. 3 to 5, a pivotal support portion 6 for pivotally supporting the tilting member 5 on the support member 4 includes one of the support member 4 and the tilting member 5. The support shaft 12 is non-rotatably mounted on the member, and the support shaft 12 is rotatably mounted on the other member via a synthetic resin bearing 13. The tilting operation of the tilting member 5 with respect to the support member 4 causes the support shaft 12 to rotate. The portion that slides on the shaft 12 is limited between the bearing member 13 and the occurrence of abnormal noise and unpleasant noise is prevented.

More specifically, as shown in FIGS. 3 and 4, a support shaft 12 is attached to both cover plates 11 of the tilting member 5.
And a large-diameter shaft hole 15 into which the bearing 13 is inserted at a position corresponding to each of the side plates 9 and 9 of the support member 4. The support shaft 1 inserted into the shaft hole 14 of the tilting member 5
2 is inserted into the shaft hole 15 of the support member 4
Is rotatably inserted through a sliding hole 16 penetrating through the center of the hole. In this embodiment, a pair of short shafts 12 are used, and the shaft hole 14 and the sliding hole 1 are formed on both sides.
6 is inserted. A head 17 having a rectangular shape in a side view is formed integrally with the outer end of the support shaft 12. The head 17 is brought into contact with the outer surface of the cover plate 11 of the tilting member 5. At least one side of the portion 17 abuts on a projection 18 projecting from the outer surface of the cover plate 11, thereby restricting rotation of the support shaft 12 with respect to the shaft hole 14. Further, an E-ring 19 for retaining is fitted to the tip of the support shaft 12. Further, the bearing 13 is integrally formed with a spacer portion 20 interposed between the side plate 9 of the support member 4 and the cover plate 11 of the tilting member 5.

Further, as another embodiment of the first invention, the support shaft 12 is a long object having a length penetrating through the shaft holes 14, 14 of both the cover plates 11, 11 of the tilting member 5, and is similar to the above. With the bearings 13, 13 fitted in the shaft holes 15, 15 of the support member 4, the support shaft 12 is moved from the shaft hole 14 of one cover plate 11 to the sliding holes 16 of the bearings 13, 13. 16, is inserted into the shaft hole 14 of the other cover plate 11, and the head 17 is stopped against the same protrusion 18 protruding from the outer surface of the one cover plate 11 to regulate the rotation. An E-ring 19 is fitted to the tip of the to prevent it from coming off.

In the present invention, the structure of the support member 4 and the tilting member 5 is not particularly limited, and both members have a plate-like portion which overlaps inside and outside each other. To form the pivot 6. Further, the direction of the support shaft 12 may be reversed inside and outside, and the same protrusion 18 as described above may be formed on the inner surface side of the side plate 9 of the support member 4.

The support shaft 12 cannot rotate with respect to the tilting member 5 and can rotate with respect to the support member 4 via a bearing 13 made of synthetic resin. Therefore, even if the tilting member 5 is tilted about the pivot 6 with respect to the support member 4, the metal support shaft 12 does not slide with the metal portion of the support member 4 or the tilting member 5. Since it slides only with the sliding hole 16 of the resin bearing 13, no abnormal sound or unpleasant sound is generated.

Next, according to a second aspect of the present invention, as shown in FIG. 2, the lower end of the compression coil spring 7 is attached to the support member 4, and the upper surface of the compression coil spring 7 is
A slider 21 made of synthetic resin as A is attached, and a horizontal shaft pin 22 provided on the lower surface side of the tilting member 5 abuts on a sliding surface 21A of the slider 21;
With the tilting of the tilting member 5, the shaft pin 22 slides back and forth on the sliding surface 21A of the slider 21 so that abnormal noise and unpleasant noise are not generated.

FIG. 2A shows a state in which the seat 2 and the backrest 3 are in a no-load state, and a state in which the tilting member 5 is at the largest angle with respect to the support member 4. FIG. A load is applied by sitting on the seat 2 or leaning on the backrest 3, and the support member 4
In contrast, the tilting member 5 tilts around the pivot 6 to show the most sunk state.

The lower end of the compression coil spring 7 is immovably fixed to the upper surface of the bottom plate 8 of the support member 4 by a suitable support structure. And this compression coil spring 7
The slider 21 is attached to an upper end of the slider 21, and a shaft pin 22 provided laterally on the lower surface of the upper surface plate 10 of the tilting member 5 is always in contact with a sliding surface 21 </ b> A of the slider 21. FIG. 2 shows a trajectory in which the shaft pin 22 is displaced when the tilting member 5 is tilted about the pivot 6.
That is, an arc centered on the pivot 6 is shown in FIG.
The state shown in FIG. 2A and the state shown in FIG. 2B show how the shaft pin 22 slides on the sliding surface 21A of the slider 21 by a distance D. The shaft pin 22 has a structure in which, besides being directly attached to the tilting member 5 as shown in the figure, it is mounted on a link member pivotally attached to the tilting member 5 to apply an elastic biasing force to the tilting member 5 via the link member. There may be.

The present invention is not limited to the above-described embodiment, but includes a driving portion that rotates in the chair, such as the pivot portion 6, and a mechanism portion that applies elastic resistance by compression by the compression coil spring 7. It can be widely applied to

[0020]

As described above, the chair tilting device of the present invention is characterized in that a metal tilting member provided with a seat portion and a backrest portion is attached to a metal supporting member mounted on a leg portion by the elasticity of a compression coil spring. What is claimed is: 1. A chair tilting device pivotally supported in a tiltable manner against an urging force, wherein a pivoting portion for pivotally supporting a tilting member on said support member is non-rotatably supported on one of the support member and the tilting member. Since the shaft is mounted and the support shaft is rotatably mounted on the other member via a bearing made of synthetic resin, the tilting member with respect to the support member can be obtained by using only one bearing for one pivot. It is possible to prevent an abnormal sound or a discomfort sound from being generated at the pivotal portion, and to realize a smooth tilting of the backrest portion or the backrest portion and the seat portion.

Further, a lower end of the compression coil spring is mounted on the support member, a slider having an upper surface as a sliding surface is mounted on an upper end of the compression coil spring, and a horizontal shaft provided on a lower surface side of the tilting member. Since the pin comes into contact with the sliding surface of the slider and the shaft pin slides back and forth on the sliding surface of the slider with the tilting of the tilting member,
An abnormal sound or an unpleasant sound is prevented from being generated at a contact portion between the tilting member of the compression coil spring for elastically biasing the tilting member with respect to the support member, and the backrest portion or the backrest portion and the seat portion are prevented from being generated. A smooth tilt can be realized.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a chair to which the present invention is applied.

FIGS. 2A and 2B are conceptual views showing a chair tilting mechanism which is a premise of the tilting device of the present invention, wherein FIG. 2A shows a state where no load is applied, and FIG. 2B shows a state where the chair sits on a seat or leans on a backrest. Each state shows that a load is applied.

FIG. 3 is a simplified sectional view of a main part showing the embodiment of the first invention.

FIGS. 4A and 4B show a main part of the present invention, wherein FIG. 4A is a partial side view and FIG. 4B is a perspective view of a support shaft.

FIG. 5 is a simplified sectional view of a main part showing a modification of the first invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 leg 2 seat 3 backrest 4 support member 5 tilting member 6 pivot 7 compression coil spring 8 bottom plate 9 side plate 10 top plate 11 cover plate 12 support shaft 13 bearing member 14 shaft hole 15 shaft hole 16 sliding Hole 17 Head 18 Projection 19 E-ring 20 Spacer 21 Slider 21A Sliding surface 22 Shaft pin

Claims (2)

[Claims] 1. A metal tilting member provided with a seat and a backrest is pivotally supported on a metal support member attached to a leg so as to be tiltable against the elastic biasing force of a compression coil spring. A tilting device for a chair, wherein a pivot portion pivotally supporting the tilting member on the support member is configured to non-rotatably attach a pivot to one of the support member and the tilting member, and to attach the pivot to the other member. A tilting device for a chair, which is rotatably mounted via a bearing made of synthetic resin. 2. A metal tilting member provided with a seat portion and a backrest portion is pivotally supported on a metal supporting member attached to a leg portion to be tiltable against the elastic biasing force of a compression coil spring. A tilting device for a chair comprising: a lower end of the compression coil spring attached to the support member; a slider having an upper surface as a sliding surface attached to an upper end of the compression coil spring; and a slider provided on a lower surface side of the tilting member. A tilting device for a chair, wherein a horizontal shaft pin abuts on a sliding surface of the slider, and the shaft pin slides back and forth on the sliding surface of the slider as the tilting member tilts.