JP2501459Y2 - Chair tilt control device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilting control device for a backrest or the like in a chair in which only the backrest or the backrest and the seat body are tilted backward against the elastic deformation force of the spring body. It is about.

[0002]

2. Description of the Related Art In a chair, various means have been devised for constructing a backrest so as to be tiltable rearward against an elastic deformation force of a spring body. However, conventionally, as a spring body that elastically supports rearward tilting such as a backrest, a spring body that does not change in spring constant (hardness) such as a coil spring or rubber is used, in other words, a spring constant. Was supporting the back tilting of the backrest with a constant spring body, the angle that the backrest tilts backward when a person sitting on a chair leans against the backrest is small for a light weight person, There is a problem in that a person who has a different weight cannot give the same sitting comfort to a person who has a different weight, with one chair.

In order to solve this problem, US Pat. No. 4,077,596 as a prior art discloses a leaf spring having a spring body for elastically supporting the rearward tilting of a seat body and a backrest. The end is fixed to a fixed frame attached to the upper end of the leg of the chair, and the free end of the leaf spring is extended toward the back of the chair, while the seat is provided along the longitudinal direction of the leaf spring. A pressing body that presses the upper surface of the middle part,
The leaf spring is provided so as to be movable in the front-rear direction of the chair, and the pressing body is manually moved and adjusted to change the degree of elastic deformation of the leaf spring in an upward bow shape in advance. We have proposed a structure in which the elastic deformation resistance force (spring constant) can be adjusted according to the weight of the person sitting on the chair.

[0004]

However, in this prior art, the spring constant of the leaf spring must be manually adjusted one by one according to the weight of the person sitting on the chair. If the spring constant is set to be smaller for a person with a lighter weight, when a person with a light weight leans back, even if the backrest leans backward at an appropriate angle, a person with a heavy weight leans back , The backrest will be excessively tilted backwards. On the other hand, if the spring constant is set to increase according to the weight of a heavy person, when the weight of a heavy person leans back, the person of light weight leans on the backrest even if the backrest leans back at an appropriate angle. In this case, the backrest tilts backward only a small angle, and it is impossible to automatically adjust the backrest tilt angle to be substantially constant regardless of the weight of the person sitting on the chair. There was a problem. An object of the present invention is to provide a tilt control device that solves this problem.

[0005]

In order to achieve this object, the present invention comprises a seat body and a tilting motion body which bears a backrest load, and the tilting motion body resists elasticity of a spring body. A chair configured to tilt is provided with a movable body that interlocks with the rearward tilting of the tilting moving body via interlocking means, and a brake body that comes into contact with a friction surface of the movable body to provide frictional resistance. Further, an adjusting means is provided to increase the contact pressure of the brake body with respect to the movable body in proportion to the magnitude of the load on the seat body.

[0006]

[Operation / Effect] With this configuration, when a person sitting on a chair leans against the backrest, the tilting motion body is caused by the elastic load of the spring body and the friction surface and the brake body of the movable body due to the backrest load. It tilts against the generated frictional resistance, and the backrest tilts backward according to the tilting angle of the tilting motion body. In that case, when the weight of the person sitting on the chair is light, the backrest load is small, but when the weight is light, the seating load is small, so the adjustment means causes contact between the movable body and the brake body. Since the pressure is automatically adjusted to be small and the frictional resistance generated between the movable body and the brake body is small, the proportion of the backrest load acting as a load on the spring body is large. On the other hand, when the weight of the person sitting on the chair is heavy, the load of the backrest also increases, but when the weight of the person is heavy, the seating load also increases, so the contact pressure between the movable body and the brake body increases due to the adjusting means. As described above, since the frictional resistance generated between the movable body and the brake body is increased automatically, the proportion of the backrest load acting as a load on the spring body is reduced.

As described above, since the magnitude of the frictional resistance between the movable body and the brake body changes in proportion to the weight of the person sitting on the chair, the weight of the person sitting on the chair is different from the weight. However, since the magnitude of the load acting on the spring body is kept substantially constant, the backrest (both the backrest and the seat body when the backrest and the seat body rotate integrally) is tilted backward. The angle can be kept substantially constant regardless of the weight of the person sitting on the chair. Therefore, according to the present invention, the backrest can be automatically tilted backward by substantially the same angle even if the weight of the person sitting on the chair is slightly different. Therefore, it is possible to give a person having a different weight a proper sitting comfort. , With the effect that can be done automatically.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIGS. 1 to 4 show the first embodiment, and in these drawings, reference numeral 1 is a leg of a chair, and reference numeral 2 is a plate-like fixed frame fixed to the upper end of the leg 1. As shown in more detail below, the fixed frame body 2 includes a tilting motion body 3 having a substantially U-shape in a front cross-section and an L-shape in a side view, and a pair of left and right X-type link mechanisms 4 also serving as interlocking means. , 4 is tiltably attached back and forth, and a seat body 5 with a cushion body is attached to a horizontal portion of the tilting motion body 3 so as to be movable down, and a cushion body is attached to a vertical portion of a rear end of the tilting motion body 3. Attach the backrest 6 with.

The left and right X-shaped link mechanisms 4 and 4 each have a first link rod 4a extending rearward and a second link rod extending forward.
It is composed of a link rod 4b, and the front ends of the left and right first link rods 4a and the rear ends of the left and right second link rods 4b are pivotally attached to the side surface of the fixed frame body 2 by the first pin 7 and the second pin 8, respectively. And first
The rear end of the link rod 4a and the front end of the second link rod 4b are pivotally attached to the left and right side plates 3a, 3a of the tilting motion body 3 by the third pin 9 and the fourth pin 10, respectively. The pin hole 11 of the tilting motion body 3 into which is fitted is formed as a long hole that is long in the front-rear direction so that the tilting motion body 3 can tilt both in the front-back direction. A reinforcing plate 12 is fixed to the lower surface of the seat body 5, and the left and right side plates 3a, 3 of the tilting motion body 3 are fixed to the reinforcing plate 12.
a pair of left and right foot pieces 1 extending downward along the outer surface of a
2a and 12a are formed, and by inserting the left and right ends of the guide pin 14 penetrating the left and right side plates 3a and 3a of the tilting motion body 3 into the vertically elongated long holes 13 formed in the respective foot pieces 12a. , The seat body 5 is configured so as to be able to descend relative to the tilting motion body 3, and a weight feeling application spring 15 which constitutes an adjusting means between the upper surface of the tilting motion body 3 and the lower surface of the seat body 5. Insert.

A movable body 16 formed of an elastic body such as urethane rubber in a cylindrical shape is provided between the left and right link mechanisms 4 and 4, and the axis of the movable body 16 is the link rods 4a and 4a.
The movable body 16 is disposed so as to be parallel to the pivotal axis of b, and the movable body 16 is fitted with a brake body 17 formed of an elastically deformable metal plate in a substantially cylindrical shape with a lateral opening. 17 is fixed to the fixed frame body 2. Further, the movable body 1
The laterally long pressing pin 18 extending in parallel with the axis of the movable body 16 is inserted into a portion of the shaft 6 which is eccentrically upward by the dimension E from the shaft center, and the left and right ends of the pressing pin 18 are connected to the first and the second ends. Elongated holes 19 formed in the second link rods 4a, 4b,
When the movable body 16 is inserted into the movable body 16, the movable body 16 can rotate against the frictional resistance generated between the movable body 16 and the inner surface of the brake body 17.

The contact pressure of the brake body 17 with respect to the movable body 16 is increased by the adjusting means in proportion to the magnitude of the load on the seat body 5.
In other words, this adjusting means is the weight-sensing applied spring body 15
And a swing lever 22 having a substantially doglegged shape in a side view, which is pivotally mounted between the left and right side plates 3a, 3a of the tilting motion body 3 with a horizontally oriented pin 21, and a cableway pipe 24 into which a wire 23 is slidably inserted.
The stay member 2 has one end of the swing lever 22 abutting against the lower surface of the seat body 5 and one end of the cableway tube 24 mounted between the left and right side plates 3a, 3a of the tilting motion body 3.
5, the upper end of the wire 23 is locked to the other end of the swing lever 22, while the one side edge 17a and the other side edge 17b of the brake body 17 along the axial direction are radially outward. 1 side edge 1 of this brake body 17
7a, the other end of the cableway tube 24 is fixed, and the wire 23
The other end is locked to the other side edge 17b of the brake body 17. Between the fixed frame body 2 and the tilting motion body 3,
A spring body 26 that elastically supports the forward and backward tilt of the tilt motion body 3.
Is inserted.

In the above structure, when a person sits in the chair,
As shown by the alternate long and short dash line in FIG. 1, the seat body 5 descends toward the tilting motion body 3 against the elasticity of the body weight application spring body 15,
The vertical distance between the seat body 5 and the tilting motion body 3 is reduced.
Then, the swing lever 22 rotates as shown by the alternate long and short dash line in FIG. 1, and one end of the wire 23 is pulled, so that the interval between the one side edge 17a and the other side edge 17b of the brake body 17 is narrowed. The brake body 17 with respect to the movable body 16.
The contact pressure of becomes large.

When the person sitting on the chair leans against the backrest 6, the center of gravity of the body moves rearward, so that the tilting motion body 3 produces a moment for tilting backward about the first pin 7. Therefore, the moment that tilts the first link rod 4a rearward becomes larger than the moment that tilts the second link rod 4b forward, and as a result, the pressing pin 18
Moves rearward along the long hole 20 of the second link rod 4b, and along with this, the movable body 16 moves between the inner surface of the brake body 17 as indicated by an arrow A in FIGS. 1 and 3. It rotates around the axis against the frictional resistance generated in the. That is, due to the backrest load, the tilting motion body 3 tilts rearward against the elasticity of the spring body 26 and the frictional resistance generated between the movable body 16 and the brake body 17, and the backrest 6 and the seat. The body 5 and the tilting motion body 3 are tilted backward together with the tilting motion body 3.

In this case, the size of the backrest load increases substantially in proportion to the size of the weight of the person sitting on the chair, but the size of the seat 3 descending with respect to the tilting motion body 3 depends on the chair. By increasing in proportion to the weight of the sitting person, the contact pressure between the brake body 17 and the movable body 16, in other words, the movable body 1
Since the magnitude of the frictional resistance generated between 6 and the brake body 17 increases substantially in proportion to the weight of the person sitting on the chair, the magnitude of the load acting on the spring body 26 is ,
The weight of the person sitting on the chair is kept substantially constant regardless of the weight, and as a result, the back tilt angle of the backrest 6 and the seat 5 can be kept substantially constant regardless of the weight. is there.

When the person sitting on the chair leans forward, the moment acting on the second link rod 4b becomes larger than the moment acting on the first link rod 4a, so that the pressing pin 18 moves the first link rod 4a. The movable body 16 moves obliquely forward along the long hole 19 of the rod 4b, and the movable body 16 rotates about the axis as shown by an arrow B in FIG. The tilting motion body 3 tilts forward against the frictional resistance of 1 and the elasticity of the spring body 26. Also in this case, the movable body 1
The amount of frictional resistance generated between the brake body 6 and the brake body 17 increases substantially in proportion to the weight of the person sitting on the chair, so that the magnitude of the load on the spring body 26 is kept substantially constant. Therefore, the forward tilt angle of the seat body 5 can be kept substantially constant regardless of the difference in weight of the person sitting on the chair.

When the tilting motion body 3 is supported so as to be tiltable back and forth by using the X-shaped link mechanism 4 as in this embodiment, the tilting motion body 3 can be tilted backward and forward. There is an advantage that one movable body 16 and the brake body 17 can hold the weight substantially constant regardless of the weight of the person.

FIGS. 5 to 6 show a second embodiment. In this embodiment, a V-shaped link formed by connecting a link rod in a V-shape between the fixed frame body 2 and the seat body 5. A pair of front and rear mechanisms 27 are arranged, and the seat body 5 is attached to the fixed frame body 2 via the dog-legged link mechanisms 27, 27 so as to be movable downward.
A weight-sensing applied spring body 15 is inserted between the fixed frame body 2 and the seat body 5, while the fixed frame body 2 is provided with the front end portions of the left and right side plates 3a, 3a of the tilting motion body 3 as a support shaft 28. To pivot,
The spring body 26 supports the rearward tilting of the tilting motion body 3. Further, the cylindrical movable body 16 and the brake body 1 fitted to the movable body 16
7 is provided, and the pressing pin 18 is fitted and inserted in a portion of the movable body 16 above and behind the axis of the movable body 16.
As an example of the interlocking means, the guide holes 2 are formed in the left and right side plates 2a, 2a of the fixed frame body 2 and are arcuate in side view.
9 and the left and right side plates 3a, 3a of the tilting motion body 3 are inserted into the longitudinal holes 30 of the foot piece 3b projecting downward, while the lower surface of the seat body 5 is provided with a pressing plate as an example of an adjusting means. 31 is fixed and the lower end of the pressing plate 31 is brought into contact with the other side edge 17b of the brake body 17. The center of the radius of curvature of the guide hole 29 is substantially aligned with the axial center of the movable body 16, and the movable body 16 is
The friction plates 32, 3 are provided on the outer surface of the brake body 17 and the inner surface of the brake body 17.
3 is stretched.

In this embodiment, when a person sits in a chair,
The seat body 5 moves downward by an amount corresponding to the weight against the weight-sensing applied spring body 15, and the other side edge 17b of the brake body 17 is pressed downward by the downward movement of the seat body 5, Movable body 16
The contact pressure between the brake body 17 and the brake body 17 increases according to the weight of the person sitting on the chair. When the person sitting on the chair leans against the backrest 6, the tilting motion body 3 elastically deforms the spring body 26 and tilts backward while rotating the movable body 16. In that case, since the magnitude of the force with which the movable body 16 is tightened by the brake body 17 increases in proportion to the weight of the person sitting on the chair, the backrest 6 after the backrest 6 as in the first embodiment. The tilt angle can be kept substantially constant regardless of the weight of the person sitting in the chair.

FIGS. 7 and 8 show a third embodiment showing another embodiment of the movable body and the brake body. In this embodiment, the upper surface of the fixed frame body 2 is provided. A disk-shaped movable body 16 provided with a horizontal arm portion 16a extending radially outward is disposed between the pair of shaped bracket portions 2c and 2d, and the movable body 16 is rotatable by a pin 34. And pin 34
Movably supported in the axial direction of
The friction plate 3 is attached to the bracket portion 2c with which it abuts.
One of the bracket portions 2 can be formed by tensioning Nos. 2 and 33.
While forming c as a brake body, by supporting the rearward tilt of the tilting motion body 3 at the tip of the arm portion 16a of the movable body 16, the movable body 3 is pinned in conjunction with the rearward tilting of the tilting motion body 3. It is configured so that it can rotate around the axis of 34,
Further, the movable body 16 is pressed toward the one bracket portion 2c by a proper adjusting means with a strength according to the descending amount of the seat body 3 or the backward tilt angle. In addition,
Reference numeral 35 is a spring for returning the movable body 16 to the original posture.

The form of the movable body and the brake body in the present invention is not limited to the above-mentioned embodiment, and various other forms can be adopted, and the contact pressure of the brake body against the friction surface of the movable body can be used for the seating load. It goes without saying that various adjusting means other than the above-mentioned embodiments can be adopted as the adjusting means for making the ratio proportional to. Further, the tilting motion body may be pivotally attached to the seat body, and the movable body and the brake body may be provided between the tilting motion body and the seat body.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a first embodiment.

FIG. 2 is an exploded perspective view of the first embodiment.

FIG. 3 is an operation diagram showing a rearward tilted state of the first embodiment.

FIG. 4 is an operation diagram showing a forward tilted state of the first embodiment.

FIG. 5 is a vertical sectional side view showing a second embodiment.

FIG. 6 is a perspective view showing a main part of the second embodiment.

FIG. 7 is a perspective view of an essential part showing a third embodiment.

8 is a sectional view taken along line VIII-VIII of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leg body 2 Fixed frame body 3 Tilt motion body 4 Link mechanism that also serves as interlocking means 5 Seat body 6 Backrest 15 Body weight application spring 16 movable body 17 Brake body 18 Push pin 18 Pushing pin 23 Shaking which constitutes adjusting means Moving lever 24 Cableway tube constituting the adjusting means 26 Spring body 29 Guide hole as an example of the interlocking means 31 Pressing plate constituting the adjusting means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Hiroshi Iwabuchi, 1-4-18 Imafukuhigashi, Joto-ku, Osaka City, Ito Kikousho Co., Ltd. (56) Reference JP-A-63-161906 (JP, A) 60-92628 (JP, U) 60-92629 (JP, U) 60-92629 (JP, U) Hei 2-121842 (JP, U) US Patent 4077596 (US, A)

Claims (1)

(57) [Scope of utility model registration request] 1. A chair comprising a seat body and a tilting motion body for supporting a backrest load, wherein the tilting motion body is tilted against the elasticity of a spring body. A movable body that interlocks with the rearward tilting of the tilting motion body and a brake body that comes into contact with the friction surface of the movable body to provide frictional resistance, and further, the contact pressure of the brake body with respect to the movable body is A chair tilt control device comprising an adjusting means for increasing the load on the seat in proportion to the magnitude of the load.