JPH10192079A - Chair rocking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve beautiful appearance and safety while simplifying structure and reducing a cost and to suppress the seesaw movement of a seat. SOLUTION: A seat receiver main body 10 is made the shape of a bottomed box and is provided with a spindle 40 by matching with the vertical axis line A of the leg pole 1, and a lower restraining part 26 is provided for a movable seat receiving member 20 so as to be housed within the main body 10. Then a spring holding axis 60 is provided projecting upward for a movable back receiving member 30 through the bottom part 12 of the main body 10. A spring 50 one tip of which is restrained to the upper restraining part 66 of the axis 60 and the other tip of which is restrained to the lower restraining part 26 of the member 20 is housed in the main body 10, the rear side part 25 of the member 20 is restrained by depressing downward to the main body 10 by spring force and the rear side part 35 of the member 22 is restrained by depressing downward to the main body 10 by spring force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a chair capable of tilting a movable seat receiving member (seat) forward and tilting a movable back receiving member (back).

[0002]

2. Description of the Related Art There is known a locking device for a chair in which a seat can be tilted forward and a back can be tilted backward. A conventional structure of such a chair locking device is shown in FIGS. In these figures, 1 is a pillar, 2 is a seat body, 3 is a movable seat member, 4 is a movable back member, and 8 is a spring.

[0003] Above the pillar 1, a seat receiving body 2 is provided. A movable seat member 3 that holds a seat 3A is rotatably mounted on the seat body 2 via a support shaft 5. The support shaft 5 is provided so as to be located behind the pillar 1. A movable back support member 4 for holding a back 4A via a frame 4F is rotatably mounted on the seat body 2 via the support shaft 5.

A bolt 6 projects downward from the rear portion of the movable seat receiving member 3. The bolt 6 is used for the seat body 2
And a lower part of the movable back receiving member 4, and a spring receiving washer 7 is screwed to a lower part thereof. A spring 8 is interposed between the spring washer 7 and the movable back member 4 located below the movable seat body 2.

When the user puts his weight on the front of the seat 3A,
As shown in FIG. 6, the movable seat receiving member 3 tilts forward to obtain a reaction force due to the compression of the spring 8, and as shown in FIG. 7, when the back 4A is pushed backward, the movable back receiving member 4 is moved backward and downward. When rotated, the spring 8 is compressed, and a reaction force by the spring 8 is obtained.

[0006]

By the way, the following problems have been pointed out in the above-mentioned locking device for a chair.

[0007] Nowadays, chairs are increasingly required to have an external appearance that matches the environment in which the chair is used (for example, an office). The above-described chair with a locking device has a very excellent function of locking the seat 3A and the back 4A.
The spring 8 and the bolt 6 protrude downward from the seat body 2 and the movable backing member 4 and have a disadvantage that the appearance is impaired. Also, the clothes (such as the skirt of the skirt) of the user may be caught in the gap between the springs 8 protruding downward, and the clothes may be soiled (damaged), or the user may be injured when the foot is taken off. . Therefore, as a measure to solve the above inconvenience,
The spring 8 and the like may be covered with the tubular bellows 9, but it is difficult to completely wipe out the sense of discomfort with the surrounding part, and the cost is increased by the provision of the bellows 9.

[0008] In the above locking device for a chair, the seat 3
Since the weight of the user directly acts on A, if the seat 3A is tilted forward with the weight being applied forward, the spring 8
Is subject to excessive force. In particular, when the user is fat, an excessive force is applied to the spring 8. For this reason, not only the spring 8 but also the components (the bolts 6 and the like) that engage with the spring 8 must have extraordinarily high structural strength, resulting in structural complexity and high cost.

[0009] When the user leans back on the back 4A by leaning on the back 4A, the seat 3A may easily rock (so-called seesaw motion) without obtaining a sufficient reaction force. As described above, when the seat 3 </ b> A performs the seesaw exercise, the user feels discomfort.

SUMMARY OF THE INVENTION An object of the present invention is to provide a locking device for a chair which can improve the aesthetics and safety while simplifying the structure and reducing the cost, and can suppress the seesaw movement of the seat. It is in.

[0011]

According to the present invention, a movable seat receiving member for holding a seat and a movable back receiving member for holding a back are provided on a seat receiving body provided on an upper portion of a pillar via a common support shaft. And a movable back receiving member capable of tilting forward while opposing a spring force and a movable back receiving member being capable of tilting rearward while opposing a spring force. The bottom body is formed in a box shape, and the support body is provided with the support shaft aligned with the longitudinal axis of the pillar, and the movable seat member is provided with a lower locking portion housed in the seat body. A spring holding shaft is provided on the back receiving member so as to protrude upward by penetrating the bottom of the seat receiving body. One end of the spring holding shaft is engaged with the upper locking portion of the spring holding shaft and the other end is movable in the seat receiving body. Accommodates the spring locked with the lower locking part of
That the rear part of the movable seat receiving member is pressed down and locked to the seat main body by spring force, and that the rear part of the movable back receiving member is pressed upward and locked to the seat main body by spring force. Features.

In this invention, since the spring and the spring holding shaft are accommodated in the bottomed box-shaped seat main body, they cannot be seen from the outside. Therefore, the conventional drawback that the appearance is deteriorated by the exposure of the spring or the like is eliminated. In addition, the user's clothes (skirt skirt, etc.) and the like are caught in the gaps between the springs protruding downward, thereby cleaning (damaging) the user, and removing the user's feet from injury.

When the user applies weight to the front part of the seat (the front part of the support shaft), the moment about the support shaft of the weight [weight × arm length (action of weight) The distance from the point to the support shaft)] acts on the movable seat receiving member. Then, the movable seat receiving member rotates forward (downwardly tilts) from the state where the movable seat receiving member is pressed and locked by the seat receiving main body by the spring force.

At this time, the lower locking portion rotates together with the movable seat receiving member, and the distance between the lower locking portion and the upper locking portion decreases. Therefore, the spring interposed between the upper locking portion and the lower locking portion is contracted, and a force (spring force) proportional to the amount of compression of the spring acts on the movable seat receiving member.

That is, the moment of the spring force [spring force × length of the arm (distance from the point of application of the spring force to the support shaft)] acts on the movable seat receiving member in opposition to the above-mentioned moment of weight. . Moment of this spring force (resistance moment)
Increases as the amount of forward lean of the movable seat receiving member increases, and when the resistance moment and the moment of weight become equal, the movable seat receiving member (seat) stops. in this way,
When the seat leans forward, an appropriate reaction force is obtained from the spring.

In this case, since the support shaft is provided at a position aligned with the longitudinal axis of the pillar, the arm at the moment of weight becomes smaller and the spring is smaller than in the conventional example in which the support shaft is provided behind the pillar. The arm at the moment becomes larger.

Therefore, the compression force acting on the spring when the movable seat receiving member is tilted forward is smaller than in the conventional example. Therefore, it is not necessary to particularly increase the structural strength of the spring and the components that engage with the spring, and the structure can be simplified and the cost can be reduced as compared with the conventional example.

Further, when the user pushes the back backward with his / her back, the movable back support member is rotated downward (backward tilt) rearward from a state where the movable back support member is pressed and locked by the seat receiving body by the spring force.
When the moment of the force acting on the back (pressing force) becomes equal to the moment of the spring force (resistance moment), the movable back member (back) stops. in this way,
When the back leans backward, a moderate reaction force is obtained from the spring.

Here, when the back is inclined backward, the rear portion of the movable back support member is separated downward from the seat body.
Therefore, in a case where the movable seat receiving member and the movable back receiving member are tilted forward in synchronization with the back tilted state maintained, the upper locking portion and the lower locking portion are synchronized with each other. They will rotate in the same direction. As a result, the spring between the locking portions is not compressed, and as a result, little reaction force from the spring acts on the movable seat receiving member. So-called seesaw movements will occur.

However, in the present invention, since the support shaft is provided at a position aligned with the longitudinal axis of the pillar, a portion for applying weight to lean forward (a portion forward from the support shaft) and a back are formed in a conventional manner. Will be farther apart. Therefore, when the user is sitting on a chair in a normal state, it is unlikely that the back and seat will lean forward synchronously with the back tilted, and the seesaw movement will occur. Is effectively suppressed.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. The locking device for this chair is shown in Figs.
As shown in FIG. 4, the seat body 10 is formed in a box shape with a bottom, and a spring 50 and a component that engages with the spring 50 (a lower locking portion of the movable seat member 20) are formed in the seat body 10. 26, the spring holding shaft 60) is housed so that the spring 50 and the like are not visible from the outside.

Here, the seat receiving body 10 is shaped like a box with a bottom (for example, a boat), and is provided above the pillar 1. In the seat body 10, a movable seat member 20 for holding the seat 3A and a movable back member 30 for holding the back 4A via the frame 4F are provided so as to be aligned with the longitudinal axis A of the pillar 1. It is rotatably mounted via a support shaft 40.

More specifically, the seat body 10 is
2, front, rear, left and right side portions 11 and an open upper portion 19. The rear side of each side 11 is
It may be open. Further, a small hole (not shown) through which the spring holding shaft 60 passes is formed in the bottom portion 12. A stopper portion 14 for restricting the amount of forward tilt of the movable seat receiving member 20 is provided at a distal end portion of the seat main body 10.

The support shaft 40 is disposed so as to be located on an extension of the pillar 1. In particular, in this embodiment, the support shaft 4
0 is disposed so that its axis is orthogonal to the longitudinal axis A of the pillar 1.

The movable seat receiving member 20 is provided with a lower locking portion 26 so as to be accommodated in the seat receiving body 10. A small hole (not shown) through which the spring holding shaft 60 passes is formed in the lower locking portion 26.

The movable back support member 30 has a spring holding shaft 60 projecting upward through the respective holes of the bottom portion 12 of the seat body 10 and the lower locking portion 26. An upper locking portion 66 is provided above the spring holding shaft 60 so as to be positioned below the upper surface of the movable seat receiving member 20. In this embodiment, the upper locking part 66 is fixed to the upper part of the spring holding shaft 60 by welding. In the front part of the movable back member 30,
A plug-in type engaging groove 31 capable of fitting the support shaft 40 with one touch.
Is provided.

One end (upper end) of the spring 50 is engaged with the upper engaging portion 66 of the spring holding shaft 60, and the other end (other end) is provided.
Are housed in the seat body 10 in a state of being locked with the lower locking portion 26 of the movable seat member 20.

In this embodiment, the spring force can be adjusted by changing the distance between the upper locking portion 66 and the lower locking portion 26. Therefore, a male screw portion 61 is formed at the lower end of the spring holding shaft 60. This male screw part 61
Is projected downward through a hole (not shown) of the movable backing member 30 and is screwed with the spring force adjusting member 70.

By rotating the spring force adjusting member 70 in one direction and moving the upper locking portion 66 downward, the spring 50 is adjusted.
Is compressed and the spring force increases, and by rotating in the opposite direction, the spring force decreases.

The rear portion 25 of the movable seat receiving member 20
Is pressed downward by the elastic force of the spring 50 and locked to the engaging portion (for example, the upper edge) of the seat body 10, and the rear portion 35 of the movable backing member 30 is moved by the elastic force of the spring 50. It is configured to be pressed and locked on the 20 locking portions (for example, the bottom portion 12) upward.

Next, the operation and operation of this embodiment will be described. FIG. 4 shows a case where the user applies a weight (W) to the front portion (the front portion of the support shaft 40) of the seat 3A.
As shown in (1), a moment [weight × arm length (distance L1 from the weight application point to the support shaft)] about the support shaft 40 of the weight (W) acts on the movable seat receiving member 20. Then
The movable seat receiving member 20 pivots forward (downwardly tilts) from a state where the movable seat receiving member 20 is pressed down and locked by the locking portion (upper edge) of the seat receiving body 10 by the elastic force of the spring 50 (FIG. 2
reference).

At this time, the lower locking portion 26 rotates together with the movable seat receiving member 20, and the distance between the lower locking portion 26 and the upper locking portion 66 is reduced. Therefore, the spring 50 interposed between the upper locking portion 66 and the lower locking portion 26 is contracted, and a force (spring force F) proportional to the amount of compression of the spring 50 acts on the movable seat receiving member 20. I do.

That is, as shown in FIG. 4, the movable seat receiving member 20 resists the moment of the above-mentioned weight (W) and has a moment about the support shaft 40 of the spring force (F) [spring force × arm]. (The distance L from the point of application of the spring force to the spindle)
0)] works. The moment of the spring force (the resistance moment) increases in accordance with the increase in the amount of forward inclination of the movable seat receiving member 20, and when the resistance moment and the moment of the weight become equal, the movable seat receiving member 20 stops. . As described above, when the seat 3A tilts forward, an appropriate reaction force is obtained from the spring 50.

Here, since the support shaft 40 is provided at a position matching the longitudinal axis A of the pillar 1, the weight (W) is smaller than that of the conventional example in which the support shaft 40 is provided behind the pillar 1. Arm (L1) at the moment of
With L1 <L1 ′), the arm (L0) at the moment of the spring 50 increases (that is, L0> L).
0 ').

Therefore, the compression force (F) acting on the spring 50 when the movable seat receiving member 20 is tilted forward is smaller than in the conventional example. Therefore, it is not necessary to particularly increase the structural strength of the spring 50 and the components (26, 60) engaged with the spring 50, and the structure can be simplified and the cost can be reduced as compared with the conventional example.

When the user pushes the back 4F backward by leaning against the back 4A or the like, the movable back support member 30 is moved to the position shown in FIG.
Then, as shown by the two-dot chain line, the seat is rotated downward (backward tilt) rearward and downward from the state of being pressed and locked by the seat receiving body bottom portion 12. Then, the moment (P) of the force (pressing force P) acting on the back 4A
× L2) and the moment (F × L0) of the spring force (F) become equal, the movable back receiving member 30 (back 4A) stops. As described above, even when the back 4A is tilted backward, an appropriate reaction force can be obtained from the spring 50.

Here, when the back 4A is inclined backward, the rear portion 35 of the movable back support member 30 is separated from the bottom 12 of the seat body 10. Therefore, in a case where the movable seat receiving member 20 and the movable back receiving member 30 are tilted forward in synchronization with the back tilting state of the back 4A being maintained, the upper locking portion 66 and the lower locking portion 26 are inclined. Rotate synchronously in the same direction. For this reason, the spring 50 between the locking portions (66, 26) is not compressed, and as a result, no reaction force from the spring 50 acts on the movable seat receiving member 20. So-called,
The seesaw movement will happen.

However, since the support shaft 40 is provided at a position aligned with the longitudinal axis A of the pillar 1, a portion for applying weight to lean forward (a portion of the seat 3A in front of the support shaft 40) and a back portion. 4
A is far apart from the conventional example. Therefore, when the user is sitting on the seat 3A in a normal state, a situation in which the back 4A and the seat 3A tilt forward synchronously with the back 4A tilted backward is unlikely to occur, and the seesaw exercise is performed. Is effectively suppressed.

Thus, according to this embodiment, the seat body 10 is formed in a box shape with a bottom, and the spring 50 and the components (movable seats) that engage with the spring 50 are formed in the seat body 10. Lower retaining portion 26 of member 20, spring holding shaft 6
0) is housed so that the spring 50 and the like are invisible from the outside, so that the aesthetics and the safety are improved while the structure is simplified and the cost is reduced, and the seesaw movement of the seat 3A is suppressed. be able to.

Further, since the seat receiving body 10 is formed in a box shape, it is possible to increase the structural strength while reducing the thickness, and from this point, it is possible to further simplify the structure and reduce the cost.

Since the support shaft 40 is provided in alignment with the longitudinal axis A of the pillar 1, the bending moment acting on the joint between the seat body and the pillar 1 is significantly larger than that of the conventional example. Become smaller. Therefore, the joining structure between the seat body 10 and the pillar 1 does not need to be as strong as in the conventional example. In addition, the eccentric load acting on the pillar 1 via the support shaft 40 can be greatly reduced. Therefore, it is possible to further simplify the structure and reduce the cost.

The movable backing member 3 corresponding to the support shaft 40
Since the insertion groove 31 of the insertion type is provided at 0, mounting to the support shaft 40 can be performed by so-called one-touch. Therefore, assembling becomes easier, and the cost can be further reduced. As described above, even in the one-touch system, the movable backing member 30 is locked to the seat body 10 via the spring holding shaft 60, so that the engagement groove 31 does not come off from the support shaft 40.

Also, at the time of assembling, the spring 50 is mounted on the lower locking portion 26 and the spring holding shaft 60 is moved to the lower locking portion 26, the bottom 12 of the seat body 10 and the movable backing member 30. Can be screwed into the spring force adjusting member 70, so that the spring (8) must be engaged with the bolt (6) while the spring receiving washer (7) is not locked to the tip of the bolt. It is easier to assemble than the conventional example which does not have to be assembled.

Further, since the seat body 10 has the bottom portion 12, even if grease or the like for lubrication is applied to the contact portion between the spring 50 and the lower locking portion 26, the grease is prevented from leaking to the outside. Can be prevented. Thereby, the resistance at the time when the lower locking portion 26 laterally displaces from the other end of the spring 50 due to the rotational movement of the movable seat receiving member 20 can be greatly reduced. Thereby, the forward tilting operation of the movable seat receiving member 20 and the backward tilting operation of the movable back receiving member 30 can be performed more smoothly.

[0045]

According to the present invention, the seat body is formed in the shape of a box with a bottom, and a lower engaging portion and a spring holding portion of the movable seat member which engages with a spring or a spring in the seat body. Since the shaft is housed and the springs and the like are configured to be invisible from the outside, the aesthetics and safety can be improved while simplifying the structure and reducing the cost, and the seesaw movement of the seat can be suppressed. .

[Brief description of the drawings]

FIG. 1 is a diagram for describing an embodiment of the present invention.

FIG. 2 is a view for explaining a forward tilting operation of a seat (movable seat receiving member).

FIG. 3 is a view for explaining a backward tilt operation of a back (movable back support member).

FIG. 4 is a view for explaining the balance of forces acting on the movable seat receiving member and the movable back receiving member.

FIG. 5 is a view for explaining a conventional configuration of a chair locking device.

FIG. 6 is a view for explaining a forward tilting operation of a seat (movable seat receiving member).

FIG. 7 is a view for explaining a backward tilt operation of the back (movable back support member).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pillar 3A Seat 4A Back 10 Seat main body 20 Movable seat receiving member 25 Rear part 26 Lower locking part 30 Movable back receiving member 35 Rear part 40 Support shaft 50 Spring 60 Spring holding shaft 66 Upper locking part

Claims (1)

[Claims] A movable seat receiving member for holding a seat and a movable back receiving member for holding a back are rotatably mounted on a seat receiving body provided on an upper portion of a pillar through a common support shaft, A chair locking device in which a movable seat receiving member can tilt forward while resisting a spring force and a movable back receiving member can tilt backward while resisting a spring force, wherein the seat main body has a bottomed box shape. Also, a support shaft is provided on the seat body so as to be aligned with the longitudinal axis of the pillar, and a lower locking portion is provided on the movable seat member so as to be accommodated in the seat body, and a spring is held on the movable back member. The shaft is projected upward by penetrating the bottom of the seat body, one end of the shaft is engaged with the upper locking portion of the spring holding shaft, and the other end is formed with the lower locking portion of the movable seat receiving member. The movable spring receives the locked spring, presses the rear portion of the movable seat receiving member downwardly against the seat main body by a spring force, and locks the rear portion. Chair locking device, characterized in that engaged by pressing upward on the seat bearing main body by the spring force of the rear portion of the.