JP2519167B2 - Chair back rocking strength adjuster - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a chair back rocker.
It relates to a device for adjusting the strength of the ring.

[0002]

2. Description of the Related Art Conventionally, by rotating a knob, a spring or
The expansion / contraction bar directly, or stronger
Rocking the chair back by twisting
Devices for adjusting the bending strength are known.

[0003]

The above-mentioned conventional device is
When weakening the locking strength, loosen the spring force.
Since the knob is rotated, the rotating operation can be easily performed,
When increasing the locking strength, increase the spring force.
Since the knob is rotated, a large amount of force is required for the rotation operation.
However, there is a problem that the operability is not good.

[0004]

The present invention has a simple structure and
Meanwhile, the rocking strength can be easily adjusted with a light operating force.
To provide a device capable of
It

Therefore, the configuration of the present invention as the first means is such that the backrest portion is centered on the rotation fulcrum P.
A spring actuating member 26 that rotates around the body, and the spring actuating member 26
Keeps the backrest upright while extending toward
And a spring 21 for urging the spring operating member 26 in the direction
In the locking device for the back of a chair, the spring
The biasing direction of the spring 21 is provided while being provided on the operating member 26.
Extend in a direction intersecting with and in the radial direction of the rotation fulcrum P.
The guide surface 34, which is connected to the spring 21, and the guide 21.
The force point E of the spring 21 with respect to the contact surface 34 is configured, and
A force point structure that can move back and forth in the extension direction of the guide surface 34.
The member 33 and the force point forming member 33 are connected to the guide surface 3
Operation member 3 for adjusting movement in the forward / backward direction with respect to 4
5 and 5 .

In addition, the second aspect of the present invention is that the spring operating member 26 that moves integrally with the backrest portion and extends in the radial direction from the pivot P of the backrest portion, and the base of the chair. It is interposed between the 2 and the spring actuating member 26 includes a coil spring 21 for biasing the spring actuating member 26 in a direction which holds the vertical position of the backrest
The spring assembly 22, rotation supporting means 31 , 32 for rotatably supporting one end of the spring assembly 22 on the base 2 so as to tilt the coil spring 21, and the coil spring 2.
A force point that applies the urging force of 1 to the spring operating member 26.
When the component member 33 and the spring assembly 22 are tilted,
Together with the force point constituting member 33, the spring operating member 26
Along a direction intersecting the urging direction of the spring 21 and
An operation member 3 for adjusting the forward / backward movement in the radial direction of the rotation fulcrum P
5 and 5.

[0007]

Embodiments Embodiments will be described below with reference to the drawings.

FIG. 2 shows an exploded perspective view of a main part of the chair 1 equipped with the present invention.

The chair 1 is an outer shell 11 made of synthetic resin.
And a cushioning material 12 attached to the upper surface of the outer shell 11 and a support for supporting the outer shell 11 from below.
And over scan 2, the support rod 13 which projects to the rear surface below the base 2
And a leg 14 for holding the support rod 13 rotatably and height-adjustably.

A seat base 10 composed of an outer shell 11 and a cushion material 12 comprises a backrest 15 and a seat 1.
6 and the back portion 15 is rearward with respect to the seat portion 16.
It is configured to tilt freely .

The base 2 is formed in a dish shape having an upper opening,
Connect the front end of the outer shell 11 directly or in the vicinity of the front end.
Support the backrest support member 3 directly near the center.
The coil spring 21, which is rotatably supported by contact or indirectly,
It incorporates a spring assembly 22 with 21.

The backrest support member 3 is opposed to the base 2.
And a rotating shaft that is rotatably supported by a bearing member 23.
Portion 24 and backrest connection extended from the rotating shaft portion 24
The seat base 1 has a portion 25, and the backrest connecting portion 25 includes the seat base 1.
The 0 backrest 15 is connected. Therefore, the backrest
When the part 15 tilts rearward, the backrest support member 3 rotates.
The moving shaft portion 24 is integrally rotated as a rotation fulcrum P.

(Locking Mechanism) The backrest 15
The rotation shaft portion 24 that constitutes the rotation fulcrum P is extended in the radial direction.
Front end of the base 2
A spring assembly 22 is provided between the vicinity and the spring operating member 26.
The backrest 15 is erected by the spring 21.
The spring actuating member 26 is elastically urged toward the direction of holding
doing.

Therefore, the seated person can move the backrest 15 rearward.
When leaning backward to tilt, the spring actuating member 2
6 moves integrally with the backrest portion 15, and the rotation fulcrum P is in the middle.
Rotate as a heart. The rotation of the spring operating member 26
It is done against Ne 21.

On the other hand, the force exerted on the backrest 15 by the seated person
When the backrest 15 is reduced, the backrest portion 15 is returned to the standing posture.
Go home. That is, the spring operating member 26 causes the spring 21 to elastically urge.
The backrest support member 3 interlocks when it is returned by turning by force.
The backrest 15 is raised.

As a result, due to the elastic force of the spring 21, the back is also
The leaning portion 15 is freely rockable.

(Rocking Strength Adjusting Device) The Spring Assembly
The three-dimensional body 22 is a spring support body 27 that is elastically combined.
And a biasing member 28, and in the case of the example shown in FIG.
A part of the biasing action member 28 is attached to the tubular portion 29 formed in the body 27.
The guide rod 30 constituting the
One end of the spring 21 to the spring support 27 and the other end of the spring 21.
Are elastically locked to the biasing member 28. This
At this time, the coil spring 21 is attached to the guide rod 30 and
The tubular portion 29 is inserted.

The spring assembly 22 can be freely tilted together with the spring 21.
Therefore, the spring support body 27 is rotated by the base 2.
Currently supported. In the case of the example shown, the circle on the base 2
Rotation formed on the spring support 27 on the rod-shaped support protrusion 31.
The recesses 32 are fitted on the outside and locked so as to be rotatable relative to each other.
It

On the other hand, in order to apply the elastic force of the spring 21 to the spring actuating member 26, a force point constituting member 33 is connected to the urging acting member 28. This power point component 3
3 indicates the spring 21 along the guide surface 34 of the spring operating member 6.
Is movable forward and backward in a direction intersecting the urging direction and in the radial direction of the rotation fulcrum P. That is, the spring assembly 22
When tilted, the force point component member 33 moves along the guide surface 34, thereby intersecting the biasing direction of the spring 21.
In the vertical direction, the distance between the force point E of the spring 21 on the spring actuating member 26 and the rotation fulcrum P changes.

The force application member 28 is connected to the force point forming member 33.
Along with the spring operating member 26, it is possible to adjust the forward / backward movement.
Therefore, the operation member 35 is provided.

In the illustrated embodiment, the operating member 35 is a force point.
The screw shaft is screwed into the screw hole 36 of the component member 33, and
By rotating in the reverse direction, the force point component member 33 can be moved back and forth.
Noh.

The operating member 35 is a rotary shaft of the rotary knob 37.
Is provided continuously with the portion 38, and the rotating shaft portion 38 is provided with the rotating knob holding surface 3
9 is rotatably held.

In the illustrated example, the rotary knob holding surface 39 is a spring.
The rotary knob 37 is connected to the operating member 6 and the rotary knob 37 is provided below the base 2.
Since it is located at
The rotary knob 37 can be moved back and forth together with the operation member 26.
As described above, the escape hole 40 is formed in the base 2. Also,
When the spring assembly 22 is tilted, the biasing member 28 and the force point structure are
Since the refraction itself is relatively made to the component member 33, the force point configuration
The rotation recess 42 of the biasing member 28 is attached to the protrusion 41 of the member 33.
Is rotatably fitted on the outside.

The locking strength adjusting device of the present invention is
Needless to say, the present invention is not limited to the examples.
Various design changes based on the technical idea described in the claims
It is possible to change. For example, the spring actuating member 26 is
In addition to extending downward from the rotating shaft portion 24, extending upward
In this case, the spring 21 may be a tension spring or
Is arranged so that the spring biasing direction of the spring 21 is opposite.
Just go. Further, the force point constituting member 33 is the biasing action member 2
8 may be integrated with the spring actuating member 26.
The force point E of the spring 21 with respect to is sufficient.

[0025] (the action of the adjustment locking strength) to the above-described configuration
When adjusting the locking strength of the backrest portion 15 based on the above, the rotary knob 37 is rotated in either direction.

Then, as the operating member 35 rotates,
The force point component member 33 sequentially moves up and down along the spring actuating member 26 , and the rotation fulcrum P ( rotation fulcrum of the backrest portion 15) and force are applied.
The distance between the points E changes accordingly.

That is, the distance from the position where the weight is loaded on the backrest portion 15 to the fulcrum is constant, and the spring operating member 26
Since the spring force applied to is almost constant, the rotation fulcrum P
The shorter the distance between the force point E, will be even smaller force applied to the backrest portion 15 balances with the spring force, times
The opposite is true if the distance between the fulcrum P and the force point E increases.

That is, the farther the force point E is from the rotation fulcrum P ,
The force required for locking is large, and the closer it is, the smaller force required for locking.

To move the force point E by the operating member 35
At this time, the force point constituting member 33 and the urging action member 28 are not accompanied by each other.
Move. During the movement, the coil spring 21
A part from the at least biasing member 28 toward the spring support 27
The guide rod 30 is inserted in the minute. Therefore,
When moving, the coil spring 21 should not be displaced.
Without a promise, it always promises a normal spring direction and spring force.

(Locking Fixing Device) The locking fixing device 8 projects rearward on the rear surface of the spring actuating member 26 , and is screwed into the stopper receiving seat 82 in which the screw cylinder 81 is formed in the up-down direction and the screw cylinder 81. A stopper shaft 83 protruding below the rear end of the stopper seat 82, an insertion hole 84 located below the stopper shaft 83, and a stopper plate located above the insertion hole 84 to close and open the insertion hole 84. 85,
The connecting rod 87 connects the stopper plate 85 to the operation plate 86.

The insertion hole 84 is formed on the upper surface of the rear portion of the base 2 on an upper surface plate 89 which is integrally mounted at a predetermined dimension above the lower surface of the base 2, and the stopper plate 85 has an end portion. Is pivoted to the upper surface plate 89 , one end side of which is rotatable above the insertion hole 84, and the other end of which is the connecting rod 87.
Are connected.

The operation plate 86 has a substantially central portion pivotally fixed to an upper end portion of the base 2, a connecting rod 87 is connected to one end thereof, and the other end thereof is a base member.
Protrudes outwardly of over scan 2, positioned below the seat portion 16.

(Operation of Locking and Fixing) Based on the above configuration
In order to fix the locking by rotating the end of the operation plate 86 in the direction of the arrow, the stopper rod 85 also rotates in the direction of the arrow by the connecting rod 87, and the end of the operation plate 86 is inserted into the insertion hole 84.
Located above (the state shown in FIG. 1).

In this state, even if the backrest 15 is to be locked, the lower end of the stopper shaft 83 comes into contact with the stopper plate 85 and the locking cannot be performed.

On the other hand, when releasing, the stopper plate 8 is rotated by rotating the end portion of the operation plate 86 in the direction opposite to the arrow.
5 moves from above the insertion hole 84, and the stopper shaft 83
Can be inserted into the insertion hole 84, and the backrest portion 15 can be locked.

[0036]

According to the present invention as set forth in claim 1, by operating the operation member 35, the spring 21 arranged from the base 2 toward the spring operating member 26 can be tilted . The rocking strength can be adjusted by changing and adjusting the distance between the rotation fulcrum P and the force point E in the direction intersecting the urging direction, so that the adjustment work can be performed with a light operating force. .

According to the second aspect of the present invention, one end of the spring assembly 22 is moved to the base 2 when the force point E is adjusted and moved.
Since it is freely rotatable, not only can the coil spring 21 be smoothly tilted, but also the spring assembly 22 can be tilted.
While moving it, let the force point component member 33 accompany and spring.
Since the coil spring 21 is moved forward and backward in the radial direction of the rotation fulcrum P in a direction intersecting the biasing direction of 21, the coil spring 21 is not displaced during tilting, and there is an effect that a normal spring direction and spring force can be always promised. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of one embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a chair equipped with an embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing the main part of one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chair 2 Base 3 Backrest support member 21 Coil spring 22 Spring assembly 24 Rotation shaft part 26 Spring operating member 27 Spring support body 28 Energizing member 30 Guide rod 33 Force point component member 35 Operating member 36 Screw hole 37 Rotating knob P Rotation fulcrum E Power point

Claims (2)

(57) [Claims] 1. A backrest part centered on a pivot point P.
A spring actuating member 26 that rotates around the body, and the spring actuating member 26
Keeps the backrest upright while extending toward
And a spring 21 for urging the spring operating member 26 in the direction
In a rocking device for a backrest of a chair, which is provided on the spring operating member 26,
A direction intersecting the biasing direction and a radial direction of the rotation fulcrum P
And a guide surface 34 that extends to the spring 21 and is connected to the spring 21.
The force point E of the ridge 21 is formed and the front of the guide surface 34 is formed.
The force point constituting member 33 that can move back and forth in the extension direction, and the force point constituting member 33 with respect to the guide surface 34
And an operating member 35 for adjusting movement in the forward and backward directions.
Backrest locking adjustment device of the chair, characterized in that that. 2. A spring actuating member 26 that moves integrally with the backrest portion and extends in a radial direction from a rotation fulcrum P of the backrest portion, and is interposed between the base 2 of the chair and the spring actuating member 26. And a spring assembly including a coil spring 21 for urging the spring actuating member 26 in a direction in which the upright posture of the backrest is maintained.
22 and a spring assembly for tilting the coil spring 21.
A rotation support hand that rotatably supports one end of 22 on the base 2.
The steps 31 and 32 , the force point constituting member 33 for exerting the biasing force of the coil spring 21 on the spring operating member 26, and the spring assembly 22 are tilted, and the spring operating member 26 is moved along with the force point constituting member 33. Along the spring 21
Of the rotation fulcrum P in the direction intersecting the urging direction of
An apparatus for locking a back of a chair, comprising: an operating member 35 for adjusting the movement in the forward and backward directions .