JPH0658745U - Swivel chair - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a rotary chair capable of maintaining stable rotation for a long period of time without rattling or creaking noise due to friction in the rotary bearing portion of the chair. . [Constitution] In a rotary chair in which a seat portion 2 and a seat portion support 1 are rotatably supported, a cylindrical or inverted conical shaft cylinder 10 is provided at the center of the lower surface of the seat portion 2. The seat rotating plate 9 integrally protruding downward is fixed, and a resin cylinder 13 is fitted on the outer periphery of the shaft cylinder 10 of the seat rotating plate 9 to form the shaft cylinder 10. Is rotatably fitted into the fixed shaft cylinder portion 7 of the bearing member 8 fixed to the central portion of the upper surface of the seat support body 1 through the resin cylinder body 13, and the tip end portion of the shaft cylinder 10 is fixed shaft. The retaining locking portion 16 protruding from the lower opening of the cylindrical portion 7
Is formed in.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a swivel chair in which a seat portion of a seat chair or a chair with legs is rotatably supported on a seat support member, and particularly, a stable seat in which loosening of a bearing portion and rattling are unlikely to occur. The present invention relates to a swivel chair that can maintain the supported state for a long time.

[0002]

[Prior art]

 Conventionally, a swivel chair that allows you to rotate or twist your body while sitting on a chair or sitting down to make it easier to pick up objects around you or to stand up easily. Has been used extensively in office desk chairs and recently as chairs for relaxing at home.

In such a rotary chair, a seat portion for sitting and a seat portion support member that supports the seat portion are rotatably joined by a shaft body. As shown in FIG. 7, an upper joining plate 17 made of a thick steel plate having a through hole in the center is fixed to the lower surface of the seat portion 2, and a thick steel plate having a similar through hole on the upper surface of the seat support 1 is also used. The upper joint plate 18 is fixed, and a bolt 19 having a diameter substantially the same as or slightly smaller than the diameter of the through holes is inserted through the through holes, and a fastener such as a nut 20 is screwed to the both steel plates so that the bolts 19 The upper and lower joint plates 17 and 18 were rotatably joined about the axis.

[0004]

[Problems to be solved by the device]

 However, according to such a structure of the conventional rotary chair, since the seat portion 2 and the seat portion support body 1 are rotatably joined by the joining of the bolt 19 and the nut 20, the seat portion 2 When the operation of rotating right and left is repeated many times, the screwing of the bolt 19 and the nut 20 gradually becomes loose, and there is a problem that the rotation shaft of the bolt 19 is apt to be fluttered.

Further, since the shaft body is mounted by penetrating the upper and lower joint plates, the contact holes between the through holes of the joint plates 17 and 18 made of steel plates and the shaft body (bolt 19) are caused by the inclination of the seat 2. There is a problem that distortion (deformation of steel plate) is likely to occur and rotation is not smooth, and metal friction noise is likely to be generated at the contact point between the shaft (bolt 19) and the through hole.

The present invention has been made in view of the above-mentioned conventional problems, and is to maintain stable rotation for a long period of time without causing rattling or creaking noise due to friction on the rotating shaft of a rotary chair. The present invention provides a swivel chair having a bearing structure capable of

[0007]

[Means for achieving the object]

 In order to achieve the above object, the swivel chair of the present invention is a swivel chair in which a seat portion 2 is rotatably supported on a seat portion support body 1. While the seat rotating plate 9 is integrally fixed, which is formed by projecting the shaft cylinder 10 downwardly, the resin cylinder 13 is fitted on the outer periphery of the shaft cylinder 10 of the seat rotating plate 9. The shaft cylinder 10 is rotatably fitted into the fixed shaft cylinder portion 7 of the bearing member 8 fixed to the central portion of the upper surface of the seat portion support body 1 through the resin cylinder body 13, and the shaft cylinder 10 It is characterized in that the fixed shaft tubular portion 7 and the fixed shaft tubular portion 7 are prevented from coming off.

[0008]

[Action]

 That is, according to the swivel chair of the present invention, the shaft cylinder 10 is integrally projecting downward on the lower surface of the seat rotating plate 9, and the seat rotating plate 9 is located at the center of the lower surface of the seat 2. Since it is fixed to the part, it does not loosen like the shaft body due to the bolt.

Further, according to the swivel chair of the present invention, the resin cylinder 13 is fitted on the outer periphery of the shaft cylinder 10, and the shaft cylinder 10 is seated via the resin cylinder 13. Since it is rotatably fitted in the fixed shaft cylinder portion 7 of the first bearing member 8, when the shaft cylinder 10 rotates, no friction noise such as metal scraping is generated, and the shaft cylinder 10 is fixed. Since it is fitted to the shaft cylinder 10, the shaft cylinder 10 has a structure that is unlikely to be bent and deformed, and smooth rotation can be maintained for a long period of time.

[0010]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show an embodiment of the swivel chair of the present invention applied to a seat chair. The swivel chair is used while sitting on the floor surface of a tatami mat, carpet, carpet or the like. Showing the chair.

This seat-chair-type rotary chair is composed of a seat support 1 arranged on the floor and a seat 2 rotatably supported on the upper part of the seat support 1. The seat support 1 includes two parallel seat parts each including a base ring portion 3 formed by bending a metal pipe into a rectangular ring shape, and a metal pipe fixed to the inside of the base ring portion 3 by welding. Receptacle 4 is provided.

The base wheel portion 3 is formed by bending a metal pipe into a rectangular ring shape and joining them into an endless shape. In particular, in this embodiment, the joining portion 5 of the metal pipe has a cross-sectional shape. The lower surface side (the side in contact with the floor surface) is slightly recessed to form a flat elliptical shape.

That is, it is difficult to completely match the end faces of the metal pipes at the joint part 5 of the metal pipe in the base wheel part 3, and a slight misalignment occurs between the end faces, which causes a slight step difference. Occasionally, the surface of a tatami mat, a carpet, a carpet, or the like may be scratched and scratched. To prevent such scratches on the surface of the floor finishing material at the joint portion 5 of the metal pipe, the joint portion 5 is flattened. Drawing is performed so that the lower surface side is slightly recessed so as to have an elliptical shape.

Therefore, the depression of the joining portion 5 eliminates the possibility of scratching and scratching the surface of the tatami mat, carpet, carpet, etc. at the joining portion of the metal pipe, and thus it can be used with peace of mind.

In addition, in the center of the two parallel seat receiving members 4 made of metal pipes provided inside the base wheel portion 3, the central portion of the steel plate is drawn downward to form a cylindrical type. A bearing member 8 having a fixed shaft cylindrical portion 7 formed in a cylindrical shape is fixed by welding the flat surface portion 6 thereof.

The fixed shaft cylinder portion 7 is formed in a cylindrical shape having a diameter of 3 to 8 cm, and is integrally formed with the bearing member 8 with a diameter into which a shaft body and a resin cylinder body, which will be described later, can be fitted. There is.

The seat portion 2 rotatably supported above the seat portion support 1 is provided with a seat portion with a backrest as an example. Inside the seat portion 2, a cushion material and a plywood board are provided. A base plate (not shown) is provided, and a seat rotating plate 9 made of a steel plate, on which a cylindrical shaft cylinder 10 is integrally provided, is fixed to the center of the lower surface of the seat 2.

As shown in FIGS. 3 and 4, the seat rotating plate 9 has the upper end of the cylindrical barrel 10 integrally provided on the lower surface of the central portion thereof by welding or the like. A resin cylinder 13 made of a resin molding such as nylon is fitted around the outer periphery of the resin.

Further, the seat rotating plate 9 has screw holes 12 which are screwed to the four corners of a flat surface portion 11 continuous with the periphery of the shaft cylinder 10. Through the screw holes 12, inside the seat portion 2 is provided. It is fixed by screws to the lower surface of the mounted base plate (not shown).

A flange portion 14 is provided on the outer peripheral surface of the upper end of the resin cylindrical body 13, and a peripheral groove 14 a is formed on the upper end surface of the flange portion 14. Further, vertical grooves 15 are formed at several places on the outer peripheral surface of the body of the resin cylinder 13.

The resin cylindrical body 13 is formed so that the inner diameter thereof is substantially the same as the outer diameter of the shaft cylinder 10, and the outer diameter thereof is the bearing member 8 of the seat portion support body 1 described above. The inner diameter of the fixed shaft cylindrical portion 7 is substantially the same as that of the fixed shaft cylindrical portion 7.

Therefore, when the resin cylindrical body 13 is fitted to the outer periphery of the shaft cylinder 10 and is fitted to the fixed shaft cylindrical portion 7 of the bearing 8 through the resin cylinder 13, the resin cylindrical body 13 The flange portion 14 is interposed between the lower surface of the flat surface portion 11 of the seat rotating plate 9 and the upper surface of the flat surface portion of the bearing member 8, and the resin cylindrical body 13 is interposed between the shaft cylinder 10 and the fixed shaft cylinder portion 7. It prevents the seat rotating plate 9 and the bearing member 8 from directly contacting each other by interposing the body part of the. Further, the vertical groove 15 of the resin cylindrical body 13 reduces the contact area with the inner peripheral surface of the fixed shaft cylindrical portion 7 so that the outer peripheral surface of the resin cylindrical body 13 is made slippery so that the shaft cylindrical body 10 and the resin cylindrical body 13 can The cylindrical body 13 is configured so that it can smoothly rotate in the fixed shaft cylindrical portion 7.

The shaft cylinder 10 of the seat rotating plate 9 is formed slightly longer than the length of the fixed shaft cylinder 7, and as shown in FIG. 3, the bearing member 8 is fixed via the resin cylinder 13. When fitted in the shaft cylinder portion 7, the retainer locking portion 16 is integrally formed by expanding and bending the lower end portion protruding from the lower end of the opening of the fixed shaft cylinder portion 7 to the outside. The retaining locking portion 16 joins the seat rotating plate 9 to the bearing 8 to prevent the barrel 10 from coming off.

Therefore, while the shaft cylinder 10 encloses the resin cylinder body 13 and rotates inside the fixed shaft cylinder part 7 to make the seat part 2 rotate smoothly, the retainer locking part 16 prevents the shaft part 10 from rotating. The lower end of the cylinder 10 is prevented from being deformed or coming off. As shown in FIGS. 3 and 5, the shaft cylinder 10, the resin cylinder 13, and the fixed shaft cylinder 7 are integrally combined. The rotation bearing structure is formed, and when the seat 2 to which the seat rotating plate 9 is fixed is rotated, rattling of the shaft cylinder 10 and generation of friction noise are prevented and stable rotation performance is exhibited. .

In the above embodiments, the case where the entire bearing structure is formed into a cylindrical shape has been shown. However, the fixed shaft tubular portion 7, the resin tubular body 13, and the axial barrel 10 are directed toward the lower end. The shape of the inverted truncated cone may be gradually reduced. In addition, as a structure for preventing the movable shaft cylinder 10 from slipping off from the fixed shaft cylinder portion 7, the lower ends of the fixed shaft cylinder portion 7 and the shaft cylinder 10 are formed to have a bottom, and It is also possible to have a structure in which the center of the bottom of the shaft cylinder 10 adjacent to the bottom is rotatably connected by a screw or the like.

Further, in the above-mentioned embodiments, the case of the chair is shown as a rotary chair, but the pedestal portion 3 in the embodiment is replaced with four or three legs. The chair may be configured as a swivel chair with legs.

[0027]

[Effect of device]

 As described above, according to the present invention, in the rotary chair in which the seat portion 2 is rotatably supported on the seat portion support body 1, the shaft cylinder 10 is provided downward at the center of the lower surface of the seat portion 2. The seat rotating plate 9 is integrally fixed to the seat rotating plate 9, and the resin cylinder 13 is fitted on the outer periphery of the shaft rotating plate 9 of the seat rotating plate 9 so that the shaft cylinder 10 is seated. The support shaft 1 is rotatably fitted into the fixed shaft cylinder portion 7 of the bearing member 8 fixed to the central portion of the upper surface of the part support body 1 through the resin cylinder body 13, and the shaft cylinder 10 and the fixed shaft cylinder portion 7 are also provided. Since it is a swivel chair characterized in that and are prevented from coming off, it is possible to have a structure in which the bearing part does not cause any looseness due to loosening of screws, such as the joint by screwing a bolt and a nut. .

Further, the resin cylinder 13 is fitted around the outer periphery of the shaft cylinder 10, and the shaft cylinder 10 is rotatably fitted into the fixed shaft cylinder portion 7 via the resin cylinder 13. As well as being easy to assemble and manufacture, the rotation of the barrel 10 is smooth, and no frictional noise is generated due to the rotation, which is excellent in usability.

Further, since the shaft cylinder 10 is provided integrally with the seat rotation plate 9, the shaft cylinder 10 is stable and difficult to deform even when biased in the direction of tilting the seat 2. By forming the shaft cylinder 10 in the shape of a cylinder or a truncated cone, the thickness of the entire bearing structure can be increased and the stability of the seat portion 2 can be further improved.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment in which the present invention is applied to a chair of a rotary chair,

FIG. 2 is a perspective view illustrating a seat support portion of a swivel chair;

FIG. 3 is a partially enlarged cross-sectional view illustrating a rotary shaft portion of a swivel chair.

FIG. 4 is an exploded perspective view illustrating a configuration of a rotary shaft portion of a swivel chair,

FIG. 5 is a perspective view seen from the lower surface side for explaining the configuration of the rotary shaft portion of the swivel chair;

FIG. 6 is a side view showing a conventional swivel chair,

FIG. 7 is a partially enlarged side view illustrating a rotating shaft portion in FIG.

[Explanation of symbols]

 1 Seat support 2 Seat 7 Fixed shaft cylinder 8 Bearing 9 Seat rotating plate 10 Shaft 13 Resin cylinder

Claims (1)

[Scope of utility model registration request] 1. A rotary chair in which a seat portion 2 is rotatably supported on a seat portion support 1, and a shaft cylinder 10 is integrally formed downward at the center of the lower surface of the seat portion 2. The seat rotating plate 9 protruding from the seat is fixed and the seat rotating plate 9 is fixed.
The resin cylinder 13 is fitted on the outer periphery of the shaft cylinder 10 of the bearing cylinder 8. A rotary chair characterized in that it is rotatably fitted in through and the shaft barrel 10 and the fixed shaft barrel portion 7 are prevented from coming off.