JP2526204Y2 - Chair and caster leg structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leg structure on casters such as a chair, and more specifically, a leg of a furniture with casters rotatably mounted on a leg portion of a chair, a wagon, a TV stand, a carrier and the like. Regarding the structure.

[0002]

2. Description of the Related Art Conventionally, movable furniture such as a chair, a wagon, a television stand, and a carrier (hereinafter, referred to as "chairs, etc.").
As a structure for attaching the casters to the synthetic resin legs so as to be freely rotatable horizontally, a well-known structure as shown in FIG. 8 is generally used.

[0003] That is, as shown in FIG.
A nut 101 is attached later to the nut 101 by means of insert molding, fitting or the like, and a screw portion 104 formed at a tip protruding portion of a caster pin 103 previously rotatably mounted on the caster body 102 is screwed to the nut 101. There is a structure of mounting. Also, as shown in FIG.
A mounting hole 105 that opens downward is formed in the leg portion 100, and a caster pin 103, which is previously rotatably mounted on a caster body 102, is inserted into the mounting hole 105, and a C-shape provided at the tip of the pin is provided. There is a structure in which a ring 106 is used to prevent the falling off.

However, in the former structure, the operation of screwing the screw portion to the nut is troublesome, the number of parts is large, and the caster pin has a screw portion in terms of structure, and the caster pin is screwed. And has a complicated shape such as having a portion to be engaged with a spanner, and the production cost of caster pins is high. on the other hand,
In the latter structure, the caster pins may fall out due to the impact force such as a drop impact, and a gap may be formed in the fitting portion due to the fixation with the C-shaped ring, thereby causing looseness, and the caster pins may be vertically In some cases, the horizontal rotation performance of the caster body is deteriorated.

[0005]

[Problems to be solved by the present invention] In view of the above situation, the present invention seeks to solve the problem by reducing the number of parts, simplifying the structure, simplifying the manufacturing and assembling processes, and adapting to automation. Chairs, etc. that can reduce costs and can set the caster pins accurately perpendicular to the legs, have sufficient strength even when the casters are attached to the legs, and do not rattle The present invention is to provide a caster leg structure.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a leg structure made of synthetic resin in a caster-equipped leg structure such as a chair which is movable by attaching a caster to a lower end. , the synthesis that can be fitted with casters body
A caster-equipped leg structure such as a chair in which resin caster pins are protruded by integral molding.

[0007] The tip of a caster pin made of synthetic resin
From the inside of the leg to the inside of the leg,
It is more preferable to insert a metal reinforcing pin
No.

[0008]

Caster Tsukeashi structure of the chair or the like of the present invention consisting of ## action above-described contents, by which projects in integrally molding synthetic resin key <br/> Yasutapin the legs of the synthetic resin, molded At the same time, the caster pins can be accurately and vertically set at predetermined positions, and only the assembly process of fitting the caster body to the caster pins is required.

Further, the you integrally molded legs and caster pin made of synthetic resin, it is possible to easily prepared by conventional molding, further continuously formed throughout the inside of the legs from the tip of the caster pin When a metal reinforcing pin is inserted into the shaft hole, both ease of forming and securing of strength are provided.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention;

[0011] Figure 1 is an exploded perspective view of the chair according to the present invention, reference numeral 1 leg 2 shows caster pin 3 casters body respectively. The leg 1 has five legs 4,... Formed radially from the base 5, and the base 5 has a shape in which a tapered mounting recess 6 is formed. A gas spring 7 is fitted and mounted in the mounting recess 6, or is fitted and mounted with an adhesive interposed therebetween, and a gasket 7 is mounted on the upper end thereof. The base 5
A bellows-like cover 9 is provided between the gas spring 7 and the seat mounting body 8.

As shown in FIGS. 1 to 3, the leg 1 according to the present invention is entirely made of synthetic resin, and a caster pin 2 made of synthetic resin is integrally formed on the lower surface of the tip of each leg 4. It was done.

The caster pins 2 are shown in FIGS.
In Suyo, the shaft portion 12 ungated for fitting the portion projecting from the leg portion 1 downward to castor body 3, the shaft portion 12 of the tip tapered 13 tapered so as to facilitate fitted ungated, its slightly An engaging step 14 is provided above. Here, a continuous portion between the shaft portion 12 of the caster pin 2 and the leg portion 1 includes :
The stopper portion 16 is formed so as to slightly protrude downward from the lower surface of the support leg 4.

The caster body 3 is as shown in FIG.
The vehicle has a wheel 17 which is formed entirely of a synthetic resin and is provided with a rollable wheel 17 and a bearing hole 18 which is opened upward at a position eccentric from the axis of the wheel 17. A chamfered portion 19 is formed on the inner peripheral portion of the rim of the bearing hole 18 so that the caster pin 2 can be easily inserted, and the engaging step 14 of the caster pin 2 is engaged with the inside to prevent the caster pin 2 from slipping off. Luz topper 20 is circumferentially provided.

In order to mount the caster on the leg 1, the caster pin 2 projecting from the leg 1 is
The caster body 3 is mounted on the leg 1 by simply inserting it into the bearing hole 18 of the caster body 3 and inserting it to the position where the engaging step 14 at the tip has passed the stopper 20. This operation can be completely automated since it is only a simple insertion of two members. At this time, if a flat washer 21 having excellent slidability is inserted into the shaft portion 12 of the caster pin 2, the leg 1 is stopped when the caster pin 2 is fitted to the caster body 3. Since it is interposed between the portion 16 and the upper end of the bearing hole 18 of the caster main body 3, the horizontal rotation of the caster main body 3 is further smoothed. The flat washer 21 is formed of a synthetic resin having excellent low friction, such as an ethylene tetrafluoride resin, or a metal, or a metal having a surface coated with a slippery material. Of course, the flat washer 21 can be omitted.

[0016] Next, the present invention of the first actual reference to FIGS. 4 to 6
Examples will be described in more detail. That is, the caster pins 2 are integrally formed of a synthetic resin made of the same material as the leg 1, or the legs 1 and the caster pins 2 are formed of two different colors of synthetic resin. In this case, on the lower surface of the support leg 4 of the leg 1, a similar stop portion 16 also serving as reinforcement is integrally protruded, and the shaft portion 12 is extended from the corresponding stop portion 16. A tapered taper 13 is formed at the tip, and an engagement step 14 is formed slightly above the tapered taper 13. Then, a continuous shaft hole 22 extending from the tip of the shaft portion 12 to the inside of the support leg 4 of the leg portion 1 is formed, and a cross-shaped slit 23 is formed in the tip half of the shaft portion 12, that is, four shaft portions 12 are formed. By splitting, the fitting to the caster body 3 is facilitated. Here, the reason why the shaft hole 22 is formed is that the leg portion 1 is formed by forming a space inside and forming a plurality of ribs to save the amount of resin as shown in FIG. This is because if it is solid, there is a problem of sink during molding. Of course, if the sink problem is solved, the slit 23
It is more excellent in strength to form the shaft hole 22 only at the front end portion where the is formed.

[0017] In this first embodiment, FIG. 5
As described above, the caster pin 2 can be simply inserted into the bearing hole 18 of the caster body 3 as described above .
At this time, the front end of the shaft portion 12 of the caster pin 2 is separated into four parts as shown in FIG. 6 (a) before the insertion, but after the insertion, FIG. And the diameter of the upper part of the engaging step 14 is reduced in this state.
Thus , the stopper 20 can be accommodated. Here, even if the shaft portion 12 of the caster pin 2 is set to have substantially the same diameter as the bearing hole 18 of the caster main body 3, the fitting operation can be easily performed since the slit 23 is formed at the tip portion, With such a setting, the caster body 3 can be mounted without rattling.

[0018] Finally, the second embodiment shown in FIG. 7, the first
In addition to the configuration similar to that of the embodiment , a metal reinforcing pin 24 is inserted into the shaft hole 22. In the case where the shaft hole 22 is provided for molding reasons as in the first embodiment, the strength of the caster pin 2 may be reduced. However, by inserting the reinforcing pin 24, the caster pin 2 is made of synthetic resin. The strength problem is eliminated at a glance without impairing the advantage of being integrally molded with the resin. When the tip of the shaft portion 12 having the slit 23 formed thereon is fitted into the caster body 3, the tip of the shaft portion 12 also becomes thinner in a tapered shape. It is preferable that the tip of the reinforcing pin 24 is formed in a tapered shape because the reinforcing pin 24 does not fall down in the mounted state. Of course, if a portion corresponding to the slit 23 of the shaft hole 22 is formed in a reverse taper shape in advance so that the inner diameter of the shaft hole 22 becomes the same as the upper portion even if the tip of the shaft portion 12 becomes thinner, the same diameter is obtained. Can be used.

In the present embodiment, the leg structure of the chair has been described. However, as described above, the present invention is not limited to the chair, and furniture having casters at the lower end so as to be movable, for example, a wagon, a TV stand, and the like. , Carriers and the like.

[0020]

[Effects of the Invention] According to the legged structure on casters of the chair and the like of the present invention described above, in the legged structure of casters and the like made movable by attaching a caster to the lower end,
Since caster pins made of synthetic resin that can fit the caster body are integrally formed on the legs made of synthetic resin to protrude, the number of parts is reduced, and the structure is simplified. As a result, the manufacturing and assembly processes can be simplified and the system can be adapted to automation, thereby reducing costs.In addition, the caster pins can be set vertically perpendicular to the legs, and the casters can be attached to the legs. In this state, it has sufficient strength and does not rattle. In particular, since the integrally molded legs and caster pin made of synthetic resin, can be easily manufactured leg with caster pin in the usual molding, than further attained cost reduction.

Furthermore, the continuous forming the axial bore extending from the tip of the key Yasutapin inside leg, when fitted with metal reinforcing pins in strength due to the molding of the ease and metal by a synthetic resin It can have both of securing.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of a chair according to a representative embodiment of the present invention.

FIG. 2 is a side view showing a leg of the chair in a partial cross section.

FIG. 3 is also a bottom view

FIG. 4 shows a leg with a caster pin and a key showing the first embodiment .
Exploded sectional view of the caster body

FIG. 5 is a sectional view of a main part of the same assembled state.

FIG. 6 is a bottom view of the caster pin of the first embodiment,
(A) is a simplified bottom view before fitting to the caster body,
(B) is a simplified bottom view after fitting.

FIG. 7 is a sectional view of a main part of an assembled state showing a second embodiment.

FIG. 8 shows a conventional example, in which (a) shows a nut embedded in a leg portion.
Sectional view of the main part of the assembled structure, FIG.
Fit the caster pins protruding from the caster body to the legs
Sectional view of main part of assembled structure

[Explanation of symbols]

Reference Signs List 1 leg 2 caster pin 3 caster body 4 support 5 base 6 mounting recess 7 gas spring 8 seat mounting 9 cover 12 shaft 13 taper 14 engaging step 16 locking part 17 wheel 18 bearing hole 19 chamfer Reference Signs List 20 stopper 21 flat washer 22 shaft hole 23 slit 24 reinforcing pin

Claims (2)

(57) [Scope of request for utility model registration] 1. A caster Tsukeashi structure of the chair or the like without a movable mounting casters at the lower end, the legs are formed by synthetic resin may fitting the casters body case
A caster-equipped leg structure for a chair or the like, characterized in that caster pins made of synthetic resin are protruded by integral molding. 2. From the tip of a caster pin made of synthetic resin
A continuous shaft hole extending to the inside of the leg is formed, and the metal hole is formed in the shaft hole.
The leg structure with casters for a chair or the like according to claim 1, wherein a reinforcing pin made of metal is inserted .