JP3718268B2 - Shaking prevention mechanism of the movable member of the chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanism for preventing rattling of a movable member such as an operation lever attached to a chair. More specifically, the present invention relates to a mechanism for preventing rattling between a movable member of a chair and a fixed member facing the movable member, for example, an operation lever such as an elevating lever or a back leaning lever and a seat back cover.
[0002]
[Prior art]
Since the movable part attached to the chair needs to be played due to the mechanism and assembly thereof, there is a backlash between the supporting member and the counterpart part for supporting it. For example, between the seat lift mechanism and the lift lever that operates it, or between the back tilt mechanism and the back tilt lever that operates it, etc. Appropriate clearance and play must be provided between each lever and each mechanism, and this appears as looseness on movable parts such as the operation lever. This rattling can cause abnormal noise, and may cause discomfort and anxiety to the user in some cases.
[0003]
Therefore, a conventional chair is provided with a mechanism for preventing rattling of each lever between a movable part and a fixed member, for example, between an operation lever such as an elevating lever or a backrest tilt lever and a seat back cover. . Conventionally, as shown in FIG. 8, a cushion 104 or rubber is interposed between the levers 101 and 102 and the seat back cover 103, or the rotation support shafts of the levers 101 and 102 are used as the rattling prevention mechanism. In general, a torsion coil spring (not shown) is attached to the portion 105 and a spring force is always applied in a direction in which rattling is removed. Although not shown, one end of the torsion coil spring is hung on the levers 101 and 102 and the other end is hung on a seat receiving member 107 that supports the levers 101 and 102 and the seat 106. Further, the cushion 104 and rubber are fixed to the seat back cover 103 by adhesion. A coil spring or a leaf spring may be interposed between the levers 101 and 102 and the seat back cover 103 instead of the cushion 104 or rubber.
[0004]
[Problems to be solved by the invention]
However, since the cushion 104, rubber, coil spring, leaf spring, and the like are independent small parts, there is a risk of forgetting to attach them. Polypropylene, which is a general synthetic resin material used for the seat back cover 103 and other accessory parts of the chair, is easily used when the cushion 104 or the like is attached to the seat back cover 103 by adhesion because the adhesive is easy to peel off. There is a risk of falling off. Furthermore, since the mechanism uses parts such as the cushion 104, rubber, coil spring, leaf spring, or torsion coil spring, when assembling the chair, it is necessary to assemble the seat back cover 103 and the rotation support shaft 105 of the levers 101, 102. As a result, the assembly cost is increased and the cost for managing the separate parts is also required.
[0005]
An object of this invention is to provide the rattling prevention mechanism of the movable member of a chair which does not have a possibility of forgetting to attach or dropping in the middle of use. It is another object of the present invention to provide a ratchet prevention mechanism for a movable member of a low-cost chair that has a small number of parts and does not require special assembly work or parts management.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, the present invention provides a chair having an operation lever that swings around a fulcrum and operates an operation target, and a fixing member that comes into contact with the operation lever. One of the parts that contact each other is molded with synthetic resin, and the spring structure that protrudes toward the mating member is integrally molded with the synthetic resin, and the spring structure is occupied when the operation lever is not operated. It is formed in a position where it comes into contact with the operating lever from its swinging direction .
[0007]
Therefore, as the chair is assembled, the operation lever and the fixing member face each other and the operation lever and the fixing member abut against each other via the spring structure, so that the spring structure is deformed and rattling is removed. The operation lever is always pressed and the rattling of the operation lever is eliminated.
[0008]
Moreover, the rattling prevention mechanism of the movable member of the chair of this invention forms the spring structure in bridge shape. In this case, since the amount of deformation as a spring structure can be increased, absorption can be increased, but the amount of rattling can be increased and large springiness can be provided. Moreover, even when the operating lever collides with the fixed member, the generation of sound is suppressed by the deformation of the spring structure.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.
[0011]
FIG. 1 to FIG. 6 show an embodiment in which the rattling prevention mechanism of the movable member of the present invention is applied between various operation levers of a chair and a seat back cover. As shown in FIGS. 5 and 6, this chair is mainly composed of a seat portion 1, a backrest 2, and leg portions 3 that support them, and a seat portion lifting mechanism that lifts and lowers the seat portion 1 with a gas spring 4. 5 and a backrest tilting mechanism 7 for changing the angle of the backrest 2 by the gas spring 6, and operating levers 8 and 9 for operating the gas relief valves of the gas springs 4 and 6 are respectively provided below the seat portion 1. Become. Note that the structure of the chair itself is not particularly important in the present invention and will not be described in detail.
[0012]
The operation levers 8 and 9 are swingably attached to lever brackets 11 and 12 protruding sideways from the base 10 connected to the upper end of the gas spring 4 constituting the pedestal, respectively, and the seat portion 1 side. The corresponding gas springs 4 and 6 are provided so as to be operated by pulling them up. In this case, the shaft for attaching the operation levers 8 and 9 to the lever brackets 11 and 12 is a fulcrum of the operation levers 8 and 9, and the gas springs 4 and 6 are the operation targets of the operation levers 8 and 9. Here, the lift lever 8 directly operates the gas spring 4 at its end portion, while the backrest lever 9 is provided to operate the gas spring 6 installed obliquely via a link. A seat plate 13 is attached to the base 10 via a seat receiving bracket 14, and the seat portion 1 is supported. Further, a backrest support 15 is attached to the base 10 via a backrest bracket 16, and the backrest 2 is supported in a tiltable manner. Further, the backrest tilt mechanism 7 a gas spring 6 is provided is formed between the base 10 and backrest for bracketing Tsu DOO 16. The back surface of the seat 1 and the periphery of the base 10 including the seat lifting mechanism 5 and the backrest tilting mechanism 7 are protected by a seat back cover 17.
[0013]
The seat back cover 17 is provided so that the edge of the skin member that covers the back side of the seat portion 1 and is fixed to the seat plate 13 is not visible from the outside so as not to impair the beauty. In the case of the present embodiment, the seat back cover 17 has a hole 19 through which the back support 15 passes, a hole 18 through which the gas spring 4 constituting the pedestal passes, and a vertical groove through which the elevating lever 8 and the back tilt lever 9 pass. 20 and 20, respectively, are formed so as to integrally cover not only the back surface of the seat portion 1 but also the seat lift mechanism 5, the backrest tilt mechanism 7, the base 10, and the like. Normally, the seat back cover 17 is molded by a synthetic resin such as polypropylene and fixed to the seat plate 13 by screws or the like. In the case of the present embodiment, the seat back cover 17 is provided at a position where the operation levers 8 and 9 of the longitudinal grooves 20 and 20 through which the operation levers 8 and 9 pass are occupied when not being operated. The spring structure 21 is formed integrally with the above.
[0014]
Here, if the spring structure 21 protrudes from the base part 22 of the seat back cover 17 toward the operation levers 8 and 9 as the counterpart members and can function structurally as a spring, it is particularly limited to its shape. In addition to implementation in various bridge shapes such as flat plate shape, corrugated plate shape, arch shape curved so as to protrude toward the mating member, a portion or slit or hole formed thinner than the periphery It can also be implemented with various shapes of protrusions such as cones, cylinders or hemispheres, etc., which are given springiness by having a portion with reduced rigidity due to the presence of, but more preferably a bridge shape Of these, an arch shape is preferable. In the case of this bridge-shaped spring structure 21, the amount of deformation as a spring structure increases, so that the amount of shakiness that can be absorbed can be increased, variation caused by dimensional errors of each part can be suppressed, and large spring properties can be achieved. You can have it. Moreover, even when the movable member and the fixed member collide with each other, the generation of sound is suppressed by the buffering effect due to the deformation of the spring structure. Particularly, in the case of the spring structure 21 having an arch shape, since the collision starts from point contact, the buffering effect is higher and the generation of sound is suppressed. For this reason, for example, even when each operation lever that returns to the original position when the operation levers 8 and 9 are released from the raised state collides with the spring structure 21, generation of high noise is suppressed.
[0015]
Furthermore, the base portion 22 immediately below the spring structure 21, the field I structure 2 1 good Ri big slits 23 are formed. In this case, since one of the shapes for forming the spring structure 21 can be opened using the slit 23, an undercut does not occur in the mold structure. Therefore, it can be formed without using a slide core that complicates the mold structure. However, when it is difficult to provide the slit 23 due to problems such as the structure, or when the slit 23 is not provided for other reasons, the undercut portion generated by the adoption of the slide core is formed.
[0016]
According to the rattling prevention mechanism of the movable member configured as described above, when the seat back cover 17 is screwed to the seat plate 13 of the seat portion 1, it is supported by the lever brackets 11, 11 of the base 10. The operation levers 8 and 9 are fixed in a state in which the levers 8 and 9 are removed from contact with the spring structure 21 of the seat back cover 17.
[0017]
Each example described above is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention. For example, in the present embodiment, the embodiment in which the spring structure 21 is integrally formed on the seat back cover 17 side has been mainly described. However, the embodiment is not particularly limited thereto, and the movable member and the fixed member that faces the movable member are not limited thereto. Since at least one of the abutting portions is formed of synthetic resin and a spring structure protruding toward the mating member may be integrally formed there, the spring structure may be integrally formed on the movable member side. . That is, a part or all of the operation levers 8 and 9 may be formed of synthetic resin, and a spring structure may be integrally formed on the resin portion so as to come into contact with a fixing member such as a seat back cover.
[0018]
In the illustrated embodiment, the spring structure 21 has an arch shape having a substantially circular cross section. However, the spring structure 21 is not particularly limited thereto, and is a rectangle, a triangle, a polygon, an ellipse, or a cross section formed by combining these shapes. It is also possible. In any case, there is no particular problem with respect to the spring property exhibited by the spring structure 21. Therefore, it is preferable that the spring structure 21 has a substantially circular shape in consideration of ease of molding.
[0019]
Furthermore, in this embodiment, the spring structure 21 has an arch shape in which both ends thereof are integrated with the seat back cover 17, but is not particularly limited to this, and may be a cantilever structure. In the case of this cantilever spring structure, the rigidity of the spring is small and the deformation is easier.
[0020]
Further, the movable member is not limited to the elevating lever 8 or the backrest tilting lever 9, but may be the other operation lever attached to the chair, the backrest 2, the seat 1 or the like. For example, as shown in FIG. 5, the rattling prevention mechanism of the present invention may be applied between the backrest 2 and the backrest support 15 that supports the backrest. That is, the inner shell 24 or the outer cover (not shown) to which the cushion of the backrest 2 is attached is molded from resin, and a bridge-shaped or other shape spring structure 21 ′ in contact with the backrest support 15 is molded integrally therewith. . In this case, even when the backrest 2 swings around the hinge 25, the spring structure 21 'always abuts against the back support 15 and is elastically deformed, so that the generation of abnormal noise is prevented.
[0021]
Furthermore, it may be applied to an operating lever that swings in a horizontal plane. For example, as shown in FIG. 7, the operation lever 26 is rotatably fixed to the seat back cover 17 ′ with a screw 27 or the like so as to swing along the seat back cover 17 ′. Via a seat raising / lowering mechanism, a backrest tilting mechanism, and the like (not shown). Here, the screw 27 is a fulcrum of the operation lever 26, and the control wire 28 is an operation target. In this case, a recess 29 for accommodating the operation lever 26 is formed in the seat back cover 17 ′, and the spring structure 21 ″ protrudes toward the operation lever 26 at a portion of the wall surface 30 of the recess 29 that contacts the operation lever 26. are integrally molded. the spring construction 21 "Zaura cover 17 'of the base portion 22' ne width structure 21 immediately below the" goodness Ri big slit 23 'is formed, the mold structure on Although not shown, the present invention can be applied to a seat plate tilting (forward tilting) device (not shown).
[0022]
【The invention's effect】
As is clear from the above description, the mechanism for preventing rattling of the movable member according to the present invention is such that at least one of the operation lever and the fixed member is made of a synthetic resin, and the contact portion is opposed to the contact portion. A spring structure protruding toward the side member is integrally formed of synthetic resin, and the spring structure is formed at a position where the operating lever is occupied when not operated, so that the operating lever comes into contact with the operating lever from its swinging direction. Therefore, the operation lever and the fixing member are in contact with each other while deforming the spring structure, so that rattling can be absorbed and noise caused by rattling can be prevented. Moreover, since it is integrally molded with a resin-molded fixing member or operation lever , the operation lever and the fixing member face each other as the chair is assembled. It can prevent forgetting to attach, and it does not take time to assemble separately when assembling the chair. Furthermore, since the spring structure is integrally formed with a resin product used as an accessory of the chair, such as a seat back cover, it does not peel off during use.
[0023]
In the invention according to claim 2, since the spring structure can be formed in a bridge shape so that the amount of deformation can be increased, the amount of shakiness that can be absorbed can be increased to suppress variations caused by dimensional errors of each part. In addition, it can have a large spring property. Further, even when the operation lever and the fixing member collide with each other, the buffering effect due to the deformation of the bridge-shaped spring structure is high, and the generation of sound is suppressed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a relationship between a seat back cover and an operation lever of a chair that implements a rattling prevention mechanism for a movable member of the present invention from the inside.
FIG. 2 is a perspective view of the relationship between the seat back cover and the operation lever in FIG. 1 as viewed from the outside.
FIG. 3 is a longitudinal sectional view of a spring structure formed on a seat back cover as viewed from the inside.
4 is a cross-sectional view taken along the line IV-IV in FIG. 3;
FIG. 5 is a side view showing a partial cross section of the entire structure of the chair.
FIG. 6 is a cross-sectional view showing the main part of the present invention.
FIG. 7 is a perspective view showing another embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a rattling prevention mechanism of a movable member of a conventional chair.
[Explanation of symbols]
8,9 Operation lever (movable member)
17, 17 'Seat back cover (fixing member)
21, 21 ', 21 "spring structure 22, 22' base portion 23, 23 'slit

Claims (2)

In a chair having an operation lever that swings around a fulcrum and operates an operation target, and a fixing member that contacts the operation lever , at least one of the operation lever and the fixing member that abut each other And a spring structure protruding toward the mating member at the contact portion is integrally formed with synthetic resin, and the spring structure is formed at a position where the operating lever is occupied when not operated. A rattling prevention mechanism for the movable member of the chair , wherein the mechanism is in contact with the operation lever from the swinging direction . The mechanism for preventing rattling of the movable member of the chair according to claim 1, wherein the spring structure has a bridge shape.

Images