JPH1175981A - Tilting device of chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the external appearance of a chair, enable a free design, and reduce the number of parts. SOLUTION: The device includes a seat receiving member 3 secured to a leg 2 of a chair, a shaft 5 which is fixed to the member 3 and supports a seat plate 4 of a seat at two spaced points, for example, the opposite ends the shaft 5, and a supporting plate 6 which is rotatably mounted to the shaft 5 to support the seat plate 4 at a position where an apex of a triangle is formed together with the opposite ends of the shaft 5. And an energizing spring 7 which is interposed between the plate 6 and the member 6 to urge the plate 3 upward is provided.

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 tiltably supporting a chair seat. More specifically, the present invention relates to a chair tilting device capable of performing a rocking operation by an urging spring.

[0002]

2. Description of the Related Art There is a chair provided with a tilting device for performing a rocking operation of swinging a chair seat and a backrest back and forth. For example, a chair tilting device 101 shown in FIGS. 7 and 8 includes a seat receiving member 103 supported by a leg 102, and a seat receiving member 103.
A support shaft 104 rotatably attached to the chair with the width direction of the chair as a longitudinal direction, brackets 106 and 106 fixed to both ends of the support shaft 104 to support the seat 105, and fixed to a central portion of the support shaft 104. A swing plate 107 and an urging spring 108 composed of a compression coil spring for urging the swing plate 107 upward are provided.

When the occupant leans on the backrest 109 integrated with the seat 105, the seat 105
At the same time, the urging spring 108 is compressed by rotating the swinging plate 107 at the same time as tilting backward about the support shaft 104 together with 06 and 106. For this reason, the seat 105 and the backrest 109 tilt backward while receiving the reaction force of the biasing spring 108 due to the load, and when the load is removed, the seat 105 and the backrest 109 are returned to their original positions by the biasing spring 108, so that the locking operation can be performed. .

Further, a tilting device 101 for a chair shown in FIG.
Is a seat receiving member 103 'supported by the leg 102, a torsion bar 110 fixed to the seat receiving member 103' with the width direction of the chair as a longitudinal direction, and a seat fixed to both ends of the torsion bar 110 to support the seat. Brackets 106, 106
And When the seated person leans on the backrest integrated with the seat, the seat tilts backward while twisting the torsion bar 110 together with the brackets 106 and 106. Therefore, the seat and the backrest tilt backward while receiving the reaction force of the torsion bar 110 due to the load, and when the load is removed, the seat and the backrest are returned to the original position by the torsion bar 110, so that the rocking operation can be performed.

[0005]

However, in each of the above-described tilting devices 110, the support of the seat 105 is performed only by the brackets 106, 106 on both sides. I need. For this reason, the appearance of the chair deteriorates and the design is restricted. Further, since the large-sized brackets 106 are indispensable, it is difficult to reduce the number of parts, the assembly of the chair is complicated, and the manufacturing cost cannot be reduced.

Accordingly, an object of the present invention is to provide a tilting device for a chair, which can improve the appearance of the chair, enable free design, and reduce the number of parts.

[0007]

In order to achieve the above object, a tilting device for a chair according to the first aspect of the present invention comprises a seat receiving member fixed to a leg of the chair, and a seat receiving member fixed to the seat receiving member and two separate points. A support shaft rotatably mounted on the support shaft, the support plate rotatably mounted on the support shaft and supporting the seat at a position forming a vertex of a triangle with two separate support points of the support shaft; and the support plate and the seat. An urging spring interposed between the receiving member and the urging spring urges the support plate upward.

Accordingly, the seat is supported at two separate points on the support shaft, for example, at three places arranged in a triangular shape between the both ends and the support plate. Therefore, a large front and rear long bracket is used as the seat receiving member. There is no need to perform this operation, so that the appearance of the chair can be improved and the degree of freedom in design can be increased.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on an example of an embodiment shown in the drawings. 1 to 3 show an example of an embodiment of a tilting device for a chair according to the present invention.
The tilting device 1 includes a seat receiving member 3 fixed to a leg 2 of a chair.
A support shaft 5 fixed to the seat receiving member 3 and separated at two points, for example, at both ends, for supporting the seat (only the seat plate 4 which is the core material of the seat is shown); A support plate 6 rotatably mounted to support the seat plate 4 at a position forming a triangle with both ends of the support shaft 5;
There is provided a biasing spring 7 interposed between the support plate 6 and the seat receiving member 3 to bias the support plate 6 upward.

The seat receiving member 3 has two arms 8, 8 extending substantially in a V-shape toward the front side, and a leg receiving hole 9 formed by a vertical through hole formed at a joint portion between the arms 8, 8. And support holes 10, 10 penetrating the distal end of each arm 8, 8 in the left-right direction of the chair.
A connecting plate 11 connecting the central portions of the arms 8, 8; a concave portion 11a formed in the central portion of the connecting plate 11 and extending in the left-right direction of the chair; and a central portion of the concave portion 11a. It has a through hole 11 b and an opening 12 formed between the connecting plate 11 and the leg receiving hole 9. The seat member 3 is made of resin and is integrally formed, for example, by injection molding. In the present embodiment, the seat receiving member 3 is made of resin. However, the present invention is not limited to this, and another material such as metal may be used.

A number of ribs are formed below the arms 8,8. Therefore, a large rigidity can be obtained even if the arms 8, 8 are thin and light, so that the degree of freedom in designing the chair can be increased. The seat receiving member 3 is fixed to the upper end of the leg 2 by fitting the leg receiving hole 9 to the upper end of the rotatable leg 2.

The front end of the seat receiving member 3 has a support hole 10 and a plurality of slit-shaped through holes in upper and lower portions of the support hole 10. The through holes in the upper peripheral wall and the through holes in the lower peripheral wall of the support hole 10 are formed at alternate positions in the axial direction so as not to overlap each other up and down. Accordingly, when the seat receiving member 3 is formed by resin, it is possible to form the upper and lower peripheral walls only by the upper and lower molds without providing a core inside the support hole 10 to provide the support hole 10. it can. For this reason, the mold structure can be simplified and the molding operation can be facilitated, so that the manufacturing operation can be simplified. In the present embodiment, slit-shaped through holes are formed on the upper and lower peripheral walls of the support hole 10, but the present invention is not limited to this. For example, as shown in FIGS. There may be no cylindrical shape.

One support shaft 5 projecting to the left and right of the seat receiving member 3 is fixed to the support hole 10. The support shaft 5 is made of a solid iron bar having a circular cross section. However, the support shaft 5 is not limited to a circular section, and may be, for example, a rectangular section. Further, the support shaft 5 is not limited to a solid iron bar, and may be a hollow pipe as shown in FIGS. 4 to 6, or a metal other than iron, such as aluminum, or a plastic.

The fixing between the support hole 10 and the support shaft 5 is as follows.
As shown in FIG. 4, this is achieved by tightening a set screw 21 from the outside of the peripheral wall forming the support hole 10 to the inside of the support hole 10 to press the support shaft 5 against the inner wall of the support hole 10. The set screw 21 may be provided on at least one of the peripheral walls of the two support holes 10. In the present embodiment, the fixing between the support hole 10 and the support shaft 5 is performed by the set screw 21. However, the present invention is not limited to this. For example, instead of the set screw, a pin or the like is inserted into the support shaft from outside the peripheral wall of the support hole 10. With the support shaft 5
May be fixed by press fitting into the support hole 10.

The support plate 6 has mounting holes 13, 13 into which the support shaft 5 is rotatably inserted, and an opening 1 of the seat receiving member 3.
A support portion 14 exposed upward from the second portion and contacting the rear support portion 20 of the seat plate 4, a recess portion 15 facing and engaging the back side of the recess portion 11 a of the seat receiving member 3, and a central portion of the recess portion 15. And a through hole 15a formed in the hole. The mounting holes 13, 13 of the support plate 6 are formed as circular through-holes. This mounting hole 1
The support shaft 5 is rotatably fitted to the reference numerals 3 and 13. Further, the support portion 14 is formed with a through hole 14a penetrating the front and back.

A hanging screw 16 penetrates through the through hole 11b of the recess 11a of the seat receiving member 3 and the through hole 15a of the recess 15 of the support plate 6 from the seat receiving member 3 side. The hanging screw 16 has a T-shaped head 16a and a screw portion 16 at the lower end.
b. The head 16a enters the recess 11a. The through hole 11b is formed to be larger than the diameter of the suspension screw 16. For this reason, the suspension screw 16
Can swing back and forth about the head 16a.

A cylindrical spring receiving member 17 having a bottom plate 17a is attached to the threaded portion 16b of the suspension screw 16. A nut 18 is fixed to the center of the bottom plate 17a of the spring receiving member 17. The suspension screw 16 and the spring receiving member 17 are connected to the thread portion 16 b of the suspension screw 16.
And a nut 18 of the spring receiving member 17. Therefore, by rotating the spring receiving member 17, the nut 18 of the spring receiving member 17 moves up and down with respect to the screw portion 16 b of the suspension screw 16,
The mounting height of the spring receiving member 17 can be changed.

Further, on the outer peripheral wall of the spring receiving member 17,
As shown in FIG. 5, a non-slip vertical groove 22 is formed. Therefore, the user can easily rotate the spring receiving member 17 without slipping.

A biasing spring 7 composed of a compression coil spring is provided around the suspension screw 16 between the bottom plate 17a of the spring receiving member 17 and the support plate 6. The biasing spring 7 biases the support plate 6 so as to press it against the back side of the seat receiving member 3. Here, when the height of the bottom plate 17a is changed by rotating the spring receiving member 17, the compression length of the urging spring 7 changes, so that the magnitude of the load necessary to rotate the support plate 6 is adjusted. Can be. For this reason, since the magnitude of the force required for tilting the seat can be set to a strength according to the preference of the seated person, the sitting comfort can be improved.

Further, a seat is provided above the seat receiving member 3. The seat is generally composed of a seat plate 4 serving as a core material, a cushion (not shown) placed thereon, and an upholstery covering the cushion. The seat plate 4 is integrally formed of, for example, plastic and has front support portions 19 and 19 rotatably fitted to both ends of the support shaft 5 and the support plate 6 passing through the opening 12 of the seat receiving member 3. And a rear support portion 20 that comes into contact with the support portion 14. Then, these two front support portions 19, 19 and the rear support portion 20 are arranged as shown in FIG.
And are arranged so as to form the vertices of a triangle as shown in FIG. For this reason, the seat plate 4 includes the seat receiving member 3 and the support plate 6.
Is supported at three points, so that high stability of the seat can be obtained.

In this embodiment, the front support portion 1 is attached to the seat plate 4 of the seat.
9, 19 and the rear support portion 20 are formed, and these support portions 1
The support members 9, 19, and 20 are supported by the seat receiving member 3 and the support plate 6. However, the present invention is not limited to this.
And the support plate 6 may be used. This makes it possible to form a chair having a design with a significantly different appearance, thereby increasing the degree of freedom in design.

As shown in FIGS. 1 and 5, the front support portion 19 has a substantially C-shaped holding portion 19 for holding the support shaft 5 from front and rear.
a, 19a, and claw portions 19b, 19b of an undercut shape that go around the lower side of the support shaft 5. Each holding portion 19a has a plurality of gaps along the circumferential direction of the support shaft 5. This makes it possible to reduce the rigidity of each holding portion 19a and facilitate the work of attaching the holding portion 19a to the support shaft 5. When attaching the front support portions 19 to the support shaft 5, the front support portions 19 are pressed from above the support shaft 5 to spread the pawl portions 19b, 19b, and fitted with one touch. In the present embodiment, each holding portion 19a has a plurality of gaps along the circumferential direction of the support shaft 5, but is not limited to this and may not have any gaps.
Also in this case, each front support portion 19 can be attached to the support shaft 5 with one touch.

In this embodiment, the seat plate 4 and the front support portions 19, 1
9 is integrally formed of plastic, but the present invention is not limited to this, and the seat plate 4 and the front support portions 19 can be fixed separately. According to this, for example, the front support 1
9 and 19 can be made of metal having high rigidity and abrasion resistance, or the fitting portion to the support shaft 5 can be formed by an annular ring. When the fitting portion with the support shaft 5 is an annular ring, the front support portions 19, 19 are fitted from both ends of the support shaft 5, and after this fitting, the front support portions 19, 19
What is necessary is just to fix 19 and the seat plate 4 together.

The rear support portion 20 is formed by a projection vertically protruding downward from a position facing the opening 12 of the seat plate 4. After this, the lower end of the support part 20 is supported by the support part 14 of the support plate 6.
Is in contact with Then, as shown in FIGS. 1 and 5,
The rear support portion 20 passes through the through hole 14a from below the support portion 14.
A set screw 23 is screwed into the lower end of the screw. This allows
Since the rear support portion 20 and the support portion 14 are fixed, it is possible to prevent the seat from leaning forward about the support shaft 5 and jumping forward. In the present embodiment, the rear support portion 20 and the support portion 14 are fixed by the set screw 23. However, the present invention is not limited to the fixation by the set screw 23. For example, as shown in FIG. It may be fixed by one-touch with the claw 20a engaging with the formed support portion 14. Also in this case, it is possible to prevent the seat from leaning forward around the support shaft 5 and jumping forward.

The height of the rear support portion 20 is set to be such that the seat plate 4 becomes substantially horizontal when the support plate 6 is pressed against the seat receiving member 3. That is, the seat is substantially horizontal at normal times when no load is applied. In the present embodiment, the seat plate 4 and the rear support portion 20 are integrally formed of plastic. However, the present invention is not limited to this, and the seat plate 4 and the rear support portion 20 can be formed separately. For example, the rear support portion 20 can be made of a highly rigid metal.

When a load is applied so as to tilt the seat of the chair provided with the above-described tilting device 1 backward, the seat plate 4 rotates backward about the support shaft 5. At this time, the rear support portion 20
Pushes down the support portion 14 of the support plate 6. As a result, the support plate 6 rotates backward about the support shaft 5 to compress the urging spring 7. Here, when the support plate 6 rotates and the angle with respect to the seat receiving member 3 changes, the direction in which the urging spring 7 is pressed down changes. Due to this change, the biasing spring 7, the spring receiving member 17, and the suspension screw 16 are tilted forward (shown by a two-dot chain line in FIG. 1). And the seat is a biasing spring 7
It can be rocked because it inclines backward while receiving the reaction force.

When the load on the seat is eliminated, the biasing spring 7
Pushes up the support plate 6 until it comes into contact with the support member 3 to support the rear support portion 20, so that the seat is returned to the original position. Here, since the rear support portion 20 and the support portion 14 are fixed, it is possible to prevent the seat from being suddenly pushed up by the support portion 14 and jumping forward with the momentum around the support shaft 5.

According to the tilting device 1 of the present embodiment, the seat is provided at the three positions forming the apex of the triangle of the front support portions 19 and 19 and the rear support portion 20 of the seat plate 4 and the seat receiving member 3 and the support plate 16. Therefore, it is not necessary to use a large front and rear long bracket as a seat receiving member, so that the appearance of the chair can be improved and the degree of freedom in design can be increased.

Further, according to the tilting device 1, a large-sized bracket is not required, so that the number of parts can be reduced and work such as welding of the bracket can be omitted to simplify the assembling process of the chair. For this reason, the manufacturing cost of the chair can be reduced.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention. For example, in the present embodiment, the biasing spring 7 is a compression coil spring, but is not limited thereto and may be a torsion bar. In this case, by fixing the central portion of the support shaft 5 and the support plate 6 by also using the torsion bar as the support shaft 5, the torsion bar can be twisted by the rotation of the support plate 6 to accumulate energy. According to this, the appearance of the chair can be improved, the degree of freedom in design can be increased, and the number of parts can be further reduced.

In the above-described embodiment, the rear support portion 20
Is formed on the side of the seat plate 4, but is not limited thereto, and may be formed on the side of the support plate 6. In this case, the back side of the seat plate 4 can be flat. The upper end of the rear support portion 20 is
Push up from below to support. Also in this case, the seat is supported by the seat receiving member 3 and the supporting plate 16 at three places forming the apex of the triangle between the front support portions 19, 19 and the rear support portion 20 of the seat plate 4, so that the seat is large in size. It is not necessary to use long brackets before and after the chair, so that the appearance of the chair can be improved and the degree of freedom in design can be increased.

Further, in the above-described embodiment, the support shaft 5 is formed of one rod projecting left and right of the seat receiving member 3, but is not limited to this. For example, the support shaft 5 is formed of two rods divided right and left. Things. Also in this case, the seat receiving member 3 can support the seat plate 4 and the support plate 6.

In the tilting device 1 of the above-described embodiment, the support plate 6 is always tiltable. However, the present invention is not limited to this, and a lock mechanism for the support plate 6 can be provided. For example, a claw member engageable with the rear end of the support plate 6 is attached to the peripheral wall 12a behind the opening 12 of the seat receiving member 3 so that the support plate 6
Can be lockable. Thereby, the seat can be locked in a state where the seat is inclined, so that the feeling of use of the chair can be improved. The lock mechanism of the support plate 6 is not limited to the above-described claw member, and a bolt member or the like for fixing the support plate 6 can be used.

Further, in the tilting device 1 of the above-described embodiment, the front support portions 19 of the seat plate 4 are provided at both ends of the support shaft 5.
19 is attached, but is not limited to this. For example, the support shaft 5 may be a longer member and the front support 1
An armrest support arm may be fixed to the outer side of 9,19. Therefore, the tilting device of the present embodiment can be applied to a chair provided with an armrest that operates independently of the tilting of the seat. In the above-described embodiment, since the support shaft 5 is fixed to the seat receiving member 3, even when the seat performs a locking operation, the support shaft 5 does not rotate and the armrest remains fixed.

On the other hand, in the above-described embodiment, the support shaft 5 is fixed to the seat receiving member 3. However, the present invention is not limited to this, and the support shaft 5 may be fixed to the support plate 6.
That is, the support shaft 5 is connected to the mounting holes 13 of the support plate 6,
13 and is rotatably inserted into the support holes 10 of the seat receiving member 3 by screwing, pinning or fitting. Here, when screwing the support shaft 5 to the mounting holes 13, 13, as shown in FIGS.
It is assumed that the peripheral walls forming the members 3 and 13 have a length that can be screwed in the axial direction. Then, a screw is tightened from the outside of the peripheral wall toward the inside of the support hole 13 so that the support shaft 5
Is fixed.

When the support shaft 5 is fixed to the support plate 6 as described above, armrests are attached to both ends of the support shaft 5 so that when the seat performs a locking operation, the support shaft 5 rotates together with the support plate 6. Therefore, the armrest rotates together with the support shaft 5.

Further, screw holes are formed in both the support hole 10 of the seat receiving member 3 and the mounting hole 13 of the support plate 6, and the support shaft 5 is connected to the support hole 10 and the mounting hole 13 at the stage of assembling the chair.
It is also possible to select which of the two is fixed. In this case, it is possible to assemble a chair whose armrest is linked to the locking of the seat and a chair which is not linked to each other while using common parts for the seat receiving member 3 and the support plate 6. For this reason, the manufacturing cost can be reduced by sharing the components.

[0038]

As is apparent from the above description, the tilting device for a chair according to the first aspect has a seat receiving member fixed to the chair leg and a seat receiving member fixed to the seat receiving member at two separate points. A support plate rotatably mounted on the support shaft and supporting a seat at a position forming a vertex of a triangle with two separate support points of the support shaft; and the support plate and a seat receiving member. And a biasing spring interposed between the support member and the support plate to bias the support plate upward, so that it is not necessary to use a large front and rear long bracket as a seat receiving member, and the appearance of the chair can be improved. The degree of freedom in design can be increased.

Further, since a large-sized bracket is not required, the number of parts can be reduced and work such as welding of the bracket can be omitted, thereby simplifying the chair assembling process. For this reason, the manufacturing cost of the chair can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a main part of a tilting device for a chair of the present invention.

FIG. 2 is a plan view showing a tilting device for a chair.

FIG. 3 is a bottom view showing the tilting device of the chair.

FIG. 4 is an exploded view showing the tilting device of the chair.

FIG. 5 is a perspective view showing a tilting device for a chair.

FIG. 6 is a bottom view showing the engagement between the support plate and the rear support portion.

FIG. 7 is a side view showing a conventional tilting device for a chair.

FIG. 8 is a perspective view showing a conventional tilting device for a chair.

FIG. 9 is a perspective view showing another conventional tilting device for a chair.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tilt device 2 Leg 3 Seat receiving member 4 Seat plate (seat) 5 Support shaft 6 Support plate 7 Urging spring

Claims (1)

[Claims] 1. A seat member fixed to a leg of a chair, a support shaft fixed to the seat member and supporting a seat at two separate points, and rotatably attached to the support shaft. A support plate for supporting the seat at a position forming a vertex of a triangle together with two support points separated from the support shaft, and interposing the support plate between the support plate and the seat receiving member to attach the support plate upward. A tilting device for a chair, comprising a biasing spring for biasing the chair.