JP3891624B2 - Chair locking device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair locking device that can tilt a movable seat receiving member (seat) forward and tilt a movable back receiving member (back) backward.
[0002]
[Prior art]
2. Description of the Related Art A chair locking device capable of tilting a seat forward and tilting a back backward is known.
The conventional structure of such a chair locking device is shown in FIGS.
In these drawings, 1 is a pedestal, 2 is a seat receiving body, 3 is a movable seat receiving member, 4 is a movable back receiving member, and 8 is a spring.
[0003]
A seat main body 2 is provided on the upper portion of the pedestal 1. A movable seat receiving member 3 that holds a seat 3 </ b> A is rotatably mounted on the seat receiving body 2 via a support shaft 5. The support shaft 5 is provided so as to be located behind the pedestal 1. A movable back support member 4 that holds the back 4A via a frame 4F is rotatably mounted on the seat support body 2 via the support shaft 5.
[0004]
A bolt 6 projects downward from the rear portion of the movable seat receiving member 3. The bolt 6 protrudes below the rear portion of the seat receiving body 2 and the movable back receiving member 4, and a spring receiving washer 7 is screwed to the lower portion thereof. A spring 8 is interposed between the spring washer 7 and the movable back receiving member 4 located below the movable seat receiving body 2.
[0005]
When the user puts his / her weight on the front side of the seat 3A, the movable seat receiving member 3 tilts forward as shown in FIG. 6 to obtain a reaction force due to compression of the spring 8, and as shown in FIG. When pressed, the movable back support member 4 is rotated rearward and downward, the spring 8 is compressed, and a reaction force by the spring 8 is obtained.
[0006]
[Problems to be solved by the invention]
By the way, the following problems have been pointed out in the chair locking device.
[0007]
(1). Nowadays, chairs are increasingly required to have a beautiful appearance according to the usage environment (for example, office). The above-mentioned chair with a locking device has a very excellent function of being able to lock the seat 3A and the back 4A. However, due to the structure, the spring 8 and the bolt 6 are the seat body 2 and the movable back member 4. It has a defect that it protrudes downward from the surface and impairs the beauty.
In addition, the user's clothes (skirt hem, etc.) 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 by taking their feet. .
Therefore, as a measure for solving the above inconvenience, the spring 8 or the like may be covered with the cylindrical bellows 9, but it is difficult to completely remove the sense of incongruity with the surrounding portion and the bellows 9 is provided. The cost will increase by the amount.
[0008]
(2). In the above-mentioned chair locking device, since the weight of the user directly acts on the seat 3A, an excessive force is applied to the spring 8 when the seat 3A is tilted forward while changing the degree of weight hanging forward. Cheap. 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 (such as the bolts 6) that engage with the spring 8 have to have a particularly large structural strength, which causes a complicated structure and high cost.
[0009]
(3). When the user leans on the back 4A and the back 4A is tilted backward, the seat 3A may easily lock (so-called seesaw motion) without obtaining a sufficient reaction force. As described above, when the seat 3A performs the seesaw exercise, the user feels uncomfortable.
[0010]
An object of the present invention is to provide a locking device for a chair that can improve aesthetics and safety while simplifying the structure and reducing the cost, and can suppress a seat from seesaw-moving.
[0011]
[Means for Solving the Problems]
In the present invention, a movable seat receiving member for holding a seat and a movable back supporting member for holding a back are rotatably mounted on a seat receiving body provided at an upper portion of a pedestal via a common support shaft, and are movable. In a locking device for a chair configured such that the seat receiving member can tilt forward while resisting spring force and the movable back support member can tilt backward while resisting spring force, the seat receiving body has a bottomed box shape The seat receiving body is provided with the support shaft aligned with the vertical axis of the pedestal, the movable seat receiving member is provided with a lower locking portion accommodated in the seat receiving body, and the spring back shaft is seated on the movable back receiving member. The bottom of the receiving body penetrates and protrudes upward, and one end of the seat receiving body is locked with the upper locking portion of the spring holding shaft and the other end is locked with the lower locking portion of the movable seat receiving member. A spring is accommodated, the rear part of the movable seat receiving member is pressed and locked downward to the seat main body by the spring force, and the rear part of the movable back receiving member Characterized in that engaged by pressing upward on the seat bearing main body by the spring force.
[0012]
In this invention, since the spring and the spring holding shaft are housed in the bottomed box-shaped seat body, they cannot be seen from the outside. Therefore, the conventional defect which impairs the beauty | look by exposure of a spring etc. is eliminated. In addition, the user's clothes (skirt skirts, etc.) and the like are pinched in the gap between the springs projecting downward and are damaged (damaged), or the user is stepped on and injured.
[0013]
In addition, when the user puts his / her weight on the front part of the seat (the front part of the support shaft), the moment [weight × arm length (supported from the weight acting point) around the support shaft of the weight. The distance to the shaft)] acts on the movable seat member. Then, the movable seat receiving member rotates (tilts forward) downward and forward from the state in which the movable seat receiving member is pressed and locked by the seat receiving body.
[0014]
At this time, the lower locking portion rotates together with the movable seat receiving member, and the distance from the upper locking portion is reduced. Therefore, the spring interposed between the upper locking portion and the lower locking portion is contracted, and a force (spring force) proportional to the compression amount of the spring acts on the movable seat receiving member.
[0015]
That is, the moment of the spring force [spring force × arm length (distance from the acting point of the spring force to the support shaft)] acts on the movable seat receiving member in resistance to the above moment of weight. The moment of the spring force (resistance moment) increases as the amount of forward tilt of the movable seat member increases, and the movable seat member (seat) stops when the moment of resistance equals the moment of weight. To do.
Thus, when the seat tilts forward, an appropriate reaction force can be obtained from the spring.
[0016]
Here, since the support shaft is provided at a position aligned with the longitudinal axis of the pedestal, the arm in the weight moment is smaller and the spring moment is smaller than in the conventional example in which the support shaft is provided behind the pedestal. Arms get bigger.
[0017]
Therefore, as compared with the conventional example, when the movable seat receiving member is tilted forward, the compression force acting on the spring is reduced. Therefore, it is not necessary to significantly increase the structural strength of the spring or the component that engages with the spring, and the structure can be simplified and the cost can be reduced as compared with the conventional example.
[0018]
In addition, when the user pushes his back backward with his back, the movable back support member rotates downward (tilts backward) from a state where the movable back support member is pressed and locked by the seat body by the spring force. Then, when the moment of the force (pressing force) acting on the back becomes equal to the moment of the spring force (resistance moment), the movable back support member (back) stops. Thus, even when the back is tilted backward, an appropriate reaction force can be obtained from the spring.
[0019]
Here, in a state where the back is inclined backward, the rear portion of the movable back support member is separated downward from the seat main body. Therefore, in the case where the movable seat receiving member and the movable back receiving member are tilted forward in synchronization while the rearward tilted state is maintained, the upper locking portion and the lower locking portion are synchronized. It will rotate in the same direction. For this reason, the spring between the two locking portions is not compressed, and as a result, the reaction force from the spring hardly acts on the movable seat receiving member. The so-called seesaw movement will occur.
[0020]
However, in the present invention, since the support shaft is provided at a position aligned with the longitudinal axis of the pedestal, the portion where the weight is applied for the forward tilt (the front portion of the support shaft) and the back are compared to the conventional example. It will be far away. Therefore, when the user is sitting on the chair in a normal state, it is unlikely that the back and the seat will be tilted forward synchronously with the back tilted, and the seesaw motion will occur. Is effectively suppressed.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the chair locking device is configured such that the seat main body 10 is formed in a bottomed box shape, and the spring 50 and the components that engage with the spring 50 ( The lower locking portion 26 of the movable seat receiving member 20 and the spring holding shaft 60) are accommodated so that the spring 50 and the like cannot be seen from the outside.
[0022]
Here, the seat main body 10 has a bottomed box shape (for example, a boat shape), and is provided on an upper portion of the pedestal 1. In the seat receiving body 10, a movable seat receiving member 20 that holds the seat 3 </ b> A and a movable back receiving member 30 that holds the back 4 </ b> A via the frame 4 </ b> F are provided so as to be aligned with the longitudinal axis A of the pedestal 1. It is mounted so as to be rotatable via a support shaft 40.
[0023]
More specifically, the seat main body 10 is formed of a bottom portion 12, front and rear side portions 11, and an open upper portion 19. In addition, the rear side part of each side part 11 may be opened. Further, a small hole (not shown) for passing through the spring holding shaft 60 is formed through the bottom portion 12. A stopper portion 14 for restricting the forward tilt amount of the movable seat receiving member 20 is provided at the distal end portion of the seat receiving body 10.
[0024]
The support shaft 40 is disposed so as to be positioned on the extension of the leg column 1. In particular, in this embodiment, the support shaft 40 is disposed such that its axis is orthogonal to the longitudinal axis A of the pedestal 1.
[0025]
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) for passing through the spring holding shaft 60 is formed through the lower locking portion 26.
[0026]
A spring holding shaft 60 is provided on the movable back member 30 so as to protrude upward through the holes of the bottom portion 12 and the lower locking portion 26 of the seat receiving body 10. 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 portion 66 is fixed to the upper portion of the spring holding shaft 60 by welding. In the front portion of the movable back support member 30, a plug-in type engaging groove 31 capable of fitting the support shaft 40 with one touch is provided.
[0027]
The spring 50 is seated with one end (upper end) locked to the upper locking portion 66 of the spring holding shaft 60 and the other end (other end) locked to the lower locking portion 26 of the movable seat receiving member 20. It is accommodated in the receiving body 10.
[0028]
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 portion of the spring holding shaft 60. The male screw portion 61 protrudes downward through a hole (not shown) of the movable back member 30 and is screwed with the spring force adjusting member 70.
[0029]
By rotating the spring force adjusting member 70 in one direction and moving the upper locking portion 66 downward, the spring 50 is pressed and contracted to increase the spring force, and by rotating in the opposite direction, the spring force is increased. Decrease.
[0030]
Then, the rear portion 25 of the movable seat receiving member 20 is locked by pressing downwardly on the locking portion (for example, the upper edge) of the seat receiving body 10 by the elastic force of the spring 50, and the rear portion of the movable back receiving member 30. Reference numeral 35 denotes a structure in which the spring 50 is pressed and locked upward by a locking portion (for example, the bottom portion 12) of the seat main body 20 by the elastic force of the spring 50.
[0031]
Next, the operation and operation of this embodiment will be described.
When the user places weight (W) on the front portion of the seat 3A (the front portion of the support shaft 40), as shown in FIG. 4, a moment [about the support shaft 40 of the weight (W) [ Weight × arm length (distance L1 from the body weight action point to the support shaft)] acts on the movable seat receiving member 20. Then, the movable seat receiving member 20 rotates (tilts forward) downward from the state in which the movable seat receiving member 20 is pressed and locked downward by the locking portion (upper edge) of the seat receiving body 10 by the elastic force of the spring 50. (See FIG. 2).
[0032]
At this time, the lower locking portion 26 rotates together with the movable seat receiving member 20, and the distance from 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 compression amount of the spring 50 acts on the movable seat receiving member 20. To do.
[0033]
That is, as shown in FIG. 4, the movable seat receiving member 20 has a moment [spring force × arm length] around the support shaft 40 of the spring force (F) against the moment of weight (W) described above. (Distance L0 from the point of application of the spring force to the support shaft) acts. The moment of the spring force (resistance moment) increases as the amount of forward tilt of the movable seat receiving member 20 increases, and the movable seat receiving member 20 stops when the resistance moment and the moment of weight become equal. .
Thus, when the seat 3A is tilted forward, an appropriate reaction force is obtained from the spring 50.
[0034]
Here, since the support shaft 40 is provided at a position aligned with the longitudinal axis A of the pedestal 1, the weight (W) moment in comparison with the conventional example in which the support shaft 40 is provided behind the pedestal 1. As the arm (L1) becomes smaller (ie, L1 <L1 ′), the arm (L0) at the moment of the spring 50 becomes larger (ie, L0> L0 ′).
[0035]
Therefore, when the movable seat receiving member 20 is tilted forward as compared with the conventional example, the compression force (F) acting on the spring 50 is reduced. 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.
[0036]
Further, when the user leans on the back 4A and pushes the back 4F backward, the movable back receiving member 30 is pressed and locked to the seat receiving body bottom 12 as shown by a two-dot chain line in FIG. Rotate backward (backward tilt) from the state. When the moment (P × L2) of the force (pressing force P) acting on the back 4A becomes equal to the moment (F × L0) of the spring force (F), the movable back member 30 (back 4A) is Stop. Thus, an appropriate reaction force can be obtained from the spring 50 even when the back 4A is tilted backward.
[0037]
Here, when the back 4 </ b> A is tilted 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 the case where the movable seat receiving member 20 and the movable back receiving member 30 are tilted forward in synchronization while the back tilt state of the back 4A is maintained, the upper locking portion 66 and the lower locking portion 26 are used. And rotate in the same direction. Therefore, the spring 50 between the two locking portions (66, 26) is not compressed, and as a result, the reaction force from the spring 50 does not act on the movable seat receiving member 20. The so-called seesaw movement will occur.
[0038]
However, since the support shaft 40 is provided at a position aligned with the longitudinal axis A of the pedestal 1, the portion where the weight is applied for the forward tilt (the seat 3 </ b> A portion ahead of the support shaft 40) and the back 4 </ b> A are provided. Compared to the conventional example, it will be far away. Therefore, when the user is sitting on the seat 3A in a normal state, it is unlikely that the back 4A and the seat 3A are tilted forward synchronously with the back 4A tilted backward. The occurrence of is effectively suppressed.
[0039]
Thus, according to this embodiment, the seat body 10 is formed in a bottomed box shape, and the spring 50 and the components that engage with the spring 50 (the movable seat member 20) are formed in the seat body 10. Since the lower locking portion 26 and the spring holding shaft 60) are accommodated so that the spring 50 and the like cannot be seen from the outside, the aesthetics and safety are improved while simplifying the structure and reducing the cost, and It is possible to suppress the seat 3A from performing seesaw exercise.
[0040]
Further, since the seat main body 10 has a box shape, it is possible to increase the structural strength while achieving a reduction in thickness. From this point, the structure can be further simplified and the cost can be further reduced.
[0041]
In addition, since the support shaft 40 is provided in alignment with the longitudinal axis A of the pedestal 1, the bending moment acting on the joint between the seat main body and the pedestal 1 is significantly smaller than in the conventional example. Therefore, the joint structure between the seat receiving body 10 and the pedestal 1 does not have to be as strong as the conventional example. Further, the eccentric load acting on the pedestal 1 via the support shaft 40 can be greatly reduced. Therefore, it is possible to further simplify the structure and reduce the cost.
[0042]
Further, since the insertion-type engaging groove 31 is provided in the movable back support member 30 corresponding to the support shaft 40, the attachment to the support shaft 40 can be performed by so-called one-touch. Therefore, the assembly becomes easier and the cost can be further reduced. Thus, since the movable back support member 30 is locked to the seat support body 10 via the spring holding shaft 60 even in the one-touch system, the engagement groove 31 does not come off from the support shaft 40.
[0043]
Further, at the time of assembly, the spring 50 is placed on the lower locking portion 26 so that the spring holding shaft 60 passes through the lower locking portion 26, the bottom portion 12 of the seat receiving body 10 and the movable back receiving member 30. Therefore, the spring washer (7) must be locked to the bolt tip while holding the spring (8) through the bolt (6). Compared to, it can be assembled more easily.
[0044]
Further, since the seat body 10 has the bottom portion 12, the grease can be prevented from leaking to the outside even if grease or the like is applied to the contact portion between the spring 50 and the lower locking portion 26. Can do. Thereby, the resistance at the time when the lower locking portion 26 is laterally displaced with respect to the other end of the spring 50 due to the rotational movement of the movable seat receiving member 20 can be greatly reduced. Accordingly, 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]
【The invention's effect】
According to the present invention, the seat receiving body is formed in a bottomed box shape, and the lower locking portion of the movable seat receiving member that engages with the spring and the spring and the spring holding shaft are accommodated in the seat receiving body. Since the springs and the like are made invisible from the outside, it is possible to improve the aesthetics and the safety while simplifying the structure and reducing the cost, and to suppress the seesaw motion of the seat.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining an embodiment of the present invention.
FIG. 2 is also a view for explaining a forward tilting operation of a seat (movable seat receiving member).
FIG. 3 is also a view for explaining a backward tilting operation of a back (movable back support member).
FIG. 4 is also a diagram for explaining the balance of forces acting on the movable seat receiving member and the movable back receiving member.
FIG. 5 is a diagram for explaining a conventional configuration of a chair locking device.
FIG. 6 is also a view for explaining a forward tilting operation of a seat (movable seat receiving member).
FIG. 7 is also a view for explaining a backward tilting operation of the back (movable back support member).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pillar 3A Seat 4A Back 10 Seat receiving main body 20 Movable seat receiving member 25 Back part 26 Lower part locking part 30 Movable back receiving member 35 Back part 40 Support shaft 50 Spring 60 Spring holding shaft 66 Upper part locking part

Claims (1)

A movable seat receiving member that holds the seat and a movable back receiving member that holds the back are rotatably mounted on a seat main body provided at the upper portion of the pedestal via a common support shaft. In the locking device for a chair configured to be able to tilt forward while resisting the spring force and the movable backrest member to tilt backward while resisting the spring force,
The seat main body has a bottomed box shape, and the support shaft is provided in the seat main body so as to be aligned with the longitudinal axis of the pedestal, and the lower locking portion is accommodated in the seat main body by the movable seat member. The spring support shaft is provided on the movable back member so as to penetrate the bottom portion of the seat main body and protrude upward. One end of the spring support shaft engages with the upper locking portion of the spring support shaft and the other end. Accommodates a spring locked to the lower locking portion of the movable seat receiving member, and presses and locks the rear portion of the movable seat receiving member downward by the spring force to the seat receiving body, and the rear of the movable back receiving member A locking device for a chair, characterized in that the portion is pressed upward and locked to the seat main body by a spring force.

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