JP2558592Y2 - Chair tilt control device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a chair comprising a backrest and / or a seat plate which can be tilted rearward against the elasticity of a spring body. The present invention relates to a tilt adjusting device capable of adjusting (hardness) according to the weight of a person sitting on a chair.

[0002]

2. Description of the Related Art As such a tilt adjustment device for a chair,
Japanese Unexamined Utility Model Publication No. Sho 63-179847 discloses a tilting body having a seat plate attached to a support fixed to the upper end of a pillar in a chair so as to be tiltable rearward. Is elastically supported by a leaf spring, a screw shaft extending in the front-rear direction of the chair is rotatably and non-slidably attached to the lower surface of the tilting body, and the screw shaft is in contact with the upper surface of the leaf spring. A configuration is described in which a corresponding nut is screwed in a non-rotatable manner, a rear end of the screw shaft projects rearward of the tilting body, and a handle is attached to the rear end.

That is, in this prior art, the spring constant of the leaf spring is changed by changing the span of the load on the leaf spring by rotating the handle to move the nut in the front-rear direction of the chair, thereby changing the spring constant of the person sitting on the chair. Change in proportion to weight,
Thereby, even if the weight of the person sitting on the chair is different, the rearward inclination angle of the seat plate can be kept substantially constant.

[0004]

However, in the configuration in which the screw shaft is rotated to adjust the spring constant of the leaf spring as in this prior art, the nut is moved back and forth because the pitch of the thread on the screw shaft is small. In order to do so, the handle must be rotated many times, which causes a problem that it takes time and effort to adjust the spring constant of the leaf spring.

[0005] In order to rotate the screw shaft, it is necessary to be able to move the hand while holding the handle by hand, and for that purpose, the hand is moved between the handle and the seat plate. There is also a problem in that the seat portion of the chair becomes bulky because it is necessary to provide a vacant space for the chair. As the prior art which solved this inconvenience,
In the publication No. 161855, the upper end of the pillar in the chair is
The tilting body with the seat plate attached to the fixed support can be tilted rearward
A leaf spring with its base end fixed to the front end of the support.
Extend it rearward, and support the rear end on the lower surface of the rear of the tilting body.
On the other hand, the support is projected rearward below the leaf spring.
Between the supporting portion provided and the lower surface of the leaf spring.
A support rod extending perpendicular to the direction of extension
Insert the support rod into contact with the lower surface of the leaf spring.
It is proposed to make it adjustable in the direction. In addition,
One end of the holding rod penetrates the long hole of the scale plate.

However, in this configuration, the support rod is
Must be moved in parallel with the direction in which the spring extends,
Both ends of the support rod may protrude slightly from both left and right ends of the support.
Because only out, position adjustment is optimum for the support rod
It is extremely difficult, and it is difficult to hold the support rod in the adjustment position.
There was a problem. The present invention makes it possible to adjust the spring constant of the spring body extremely easily and to maintain the supporting position.
It is an object of the present invention to provide a tilt control device that can be easily manufactured.

[0007]

In order to achieve the above-mentioned object, a tilt adjusting device for a chair according to the present invention comprises a backrest or a seat plate or a backrest and a seat plate provided on a support provided at the upper end of a pillar of the chair. And a spring body having a beam-shaped load supporting portion for elastically supporting the tilting body to be tilted rearward, and a spring body having a beam-like load supporting portion for elastically supporting the tilting body rearwardly. Provided to extend in the front-back direction at
The tilting body has a lever on one of its left and right sides.
The base end of the lever so that it can rotate horizontally, and
The front and rear longitudinal slots formed on the other side of the tilting body
And protrude outward and extend substantially horizontally to the left and right,
A halfway portion of the lever is connected to a load support in the spring body.
The lever comes into contact with the holding part,
So that the contact part moves along the front and rear direction of the chair
The load supporting portion of the elongated hole or the spring body.
Has a holding part that holds the locking position of the lever.
is there.

[0008]

[Function and effect of the invention] With this configuration, the tilting body
Put your fingertip on the tip of the lever that protrudes laterally, and in the case of a person with heavy weight , rotate the distal end of the lever in a substantially horizontal direction so that the contact part moves in the proximal direction of the spring body, In the case of a person with a light weight, by rotating the lever so that the contact portion moves toward the distal end of the spring body, the spring constant of the spring body that supports the backrest or the seat plate or both of the back tilting is set on the chair. It can be changed in proportion to the weight of the person sitting.

As described above, according to the present invention, the tilting body side
The spring constant of the spring body can be adjusted by a one-touch operation of simply turning the lever by touching the tip of the lever protruding in the direction of the lever, so that the spring body can be adjusted according to the weight of the person sitting on the chair. This has the effect that the operation of adjusting the spring constant can be performed quickly. And the turning operation of the lever is
Since the lever can be brought close to the lower surface of the seat plate by simply moving the finger in the front-rear direction by touching the tip, the thickness of the seat is prevented from becoming unnecessarily thick, It also has the effect of making the seat compact.

Further , the tilting member is formed on the other side.
To the load supporting part in the long hole or the spring body
Has a holding part that holds the locking position of the lever.
So, once you change the lever position,
The position of the lever is easy even when the person sits repeatedly
The tilting hardness changes carelessly because it does not deviate from the holding part
This also has the effect that it can be prevented.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 denotes a chair provided with a pillar 2 having a hollow shape and the like, a seat plate 3 having a cushion 3a and a backrest 4 having a cushion 4a, and a box-like shape having an upward opening at the upper end of the pillar 2. The support plate 5 is fixed, and the seat plate 3 is fixed to the flange portion 5a formed at the upper end of the support member 5 by appropriate means such as welding or screwing.

The backrest 4 is provided inside the support 5.
A torsion spring 6 for elastically supporting the rearward tilting is provided, and a bush 8 is mounted on a support shaft 7 which passes through the left and right coil portions 6a of the torsion spring 6 between the left and right side plates 5b, 5b of the support 5. And further, both ends 6b,
6b is provided with a locking hole 9 formed in the front plate 5c of the support 5.
Each of the load supporting portions 6c connecting the coil portions 6a is formed with a cut-out hole
Extending backward from.

The backrest 4 has a round pipe L
The horizontal portions 10b of the left and right tilting members 10 are fixed to the vertical portions 10a of a pair of right and left tilting members 10 formed by bending in the shape of a letter. The front end of the horizontal portion 10b in the tilting body 10 is
The tilting body 10 and the backrest 4 are configured to tilt rearward by pivotally attaching to the front end of the side plate 5a of the support 5 with one pivot shaft 11.

Further, a load supporting portion 6c of the torsion spring 6 is provided on a horizontal portion 10a of the left and right tilting bodies 10, 10.
A reinforcement frame 12 having an open U-shape in front view so as to cover from below is fixed, and long holes 13 and 14 are formed in the left and right side plates 12a of the reinforcement frame 12, respectively.
A lever 15 adapted to be in contact with the upper surface of the load supporting portion 6a of the torsion spring 6 is inserted into the left and right long holes 13 and 14, and the horizontal bracket 16 is fixed to the left side plate 12a of the reinforcing frame 12. By pivotally connecting the base end of the lever 15 with a vertical pin 17,
The torsion spring 6 is configured to be able to rotate horizontally while being in contact with the load supporting portion 6c.

A photographing portion 15a is provided at a tip of the lever 15, and a right side plate 12 of the reinforcing frame 12 is provided.
The upper end surface 14a of the long hole 14a is formed in a sawtooth shape with a fine pitch in a side view. In the above configuration, chair 1
When the person sitting on the back leans against the backrest 4, the backrest load is elastically supported by the torsion spring 6 via the lever 15 of the tilting body 10, so that the lever 15 is rotated to operate the torsion spring. 6, the spring constant of the torsion spring 6 is changed according to the weight of the person sitting on the chair 1 by changing the support span L1 from the center of the coil part 6a to the contact part 15b of the lever 15 with the load support part 6c. Can be adjusted.

That is, when the weight of the person sitting on the chair 1 is light, the lever 15 is rotated toward the rear of the chair 1 to increase the support span L1 and reduce the spring constant of the torsion spring 6. to the other hand, when the weight of a person sitting on the chair 1 is heavy, not when it is rotated toward the lever 15 to the front of the chair 1, to increase the spring constant of the torsion spring 6 decreases the support span L1 As described above, by rotating the lever 15 to change the spring constant of the torsion spring 6 in proportion to the size of the weight of the person sitting on the chair 1, the chair 1
The back tilt angle of the backrest 4 can be made substantially constant, even if the weight of the person sitting on the back is different.

As described above, the spring constant of the torsion spring 6 can be adjusted by a one-touch operation only by rotating the lever 15 in a substantially horizontal direction.
The distance L3 from the contact part 15b to the torsion spring 6 to the distal end can be made larger than the distance L2 from the base end to the contact part 15b to the torsion spring 6, so that the lever 15 is rotated with a light force by the principle of leverage. Since the operation can be performed, the operation of adjusting the spring constant of the torsion spring 6 can be quickly performed with a small force.

The turning operation of the lever 15 is performed by the lever 1
Since the tilting body 10 can be brought close to the lower surface of the seat plate 3 by moving the tilting body 10 in the front-rear direction with the fingertip touching the side surface of the chair 5, the seat of the chair 1 can be made compact. It is. When the upper surface of the long hole 14 of the right side plate 12a of the reinforcing frame 12 is formed in a concave and convex shape such as a sawtooth shape as in the embodiment, the lever 15 can be locked in the adjusted posture, and the seat is seated. This has an advantage that the spring constant of the torsion spring 6 is prevented from being changed due to unexpected rotation of the lever 15 due to impact or the like.

As a means for holding the lever 15 in a predetermined posture, as shown in FIG.
On the upper surface of the load supporting portion 6a, the engagement groove 18 into which the lever 15 is fitted is formed at an appropriate interval along the longitudinal direction, or as shown in FIG.
Other means may be employed, such as forming a concave portion 19 in which the lever 15 fits at an appropriate interval by bending the concave portion 19a.

As in the above embodiment, the seat plate 3 is
In the case where only the backrest 4 is configured to be tiltable rearward while being fixed to the base member, there is an advantage that the lever 15 can be rotated while the person is seated. In the present invention, the backrest 4 and the seat plate 3 are fixed to the tilting body so that the backrest 4 and the seat plate 3 are tilted rearward at the same angle, or the backrest 4 and the seat plate 3 are arranged at different angles. A chair which is configured to tilt backward in conjunction with each other to support the tilting of the backrest 4 and the tilting of the seat plate 3 with one spring body, or the tilting of the seat back and the tilting seat plate individually The present invention can also be applied to a chair which is freely configured to support the backrest and the seat plate with separate spring bodies.

The spring body in the present invention is not limited to the torsion spring as in the embodiment, and it is needless to say that a leaf spring or a rod-shaped spring body can be used.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part.

FIG. 2 is a plan view in a state where a seat plate is removed.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 3;

FIG. 7 is a view showing a modification of a spring body.

FIG. 8 is a view showing a modification of a spring body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Chair 2 Pillar 3 Seat plate 4 Backrest 5 Support body 6 Torsion spring as an example of a spring body 6a Load support part 10 Tilt body 11 Pivot shaft 12 Reinforcement frame 15 Lever 15b Contact part 18 Engagement groove 19 Depression

Claims (1)

(57) [Scope of request for utility model registration] 1. A chair provided with a backrest or a seat plate or a tilting body to which both a backrest and a seating plate are attached to a support provided at the upper end of a pillar in a chair so that the tilting body can be tilted rearward. the spring member having a beam-like load-bearing part for elastically supporting, provided to extend in the longitudinal direction in the rear than the pivot point of the tilting member, said tilting member, the
The base of the lever can be turned horizontally on one of the left and right sides
And the tip of the lever is connected to the other side of the tilting body.
Protruding outward through the longitudinal holes formed in the front and rear
It is formed so as to extend to the right sideways, and in the middle of the length of the lever
Part is brought into contact with the load supporting part of the spring body,
With the horizontal rotation of the bar, the contact part against the spring body
It is configured to shift along the front-back direction, and
In addition, the locking position of the lever is
A tilt adjusting device for a chair, wherein a holding portion for holding is formed .