JP3406839B2 - Mounting structure of members in chair - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching members to each other by a shaft in a chair.

[0002]

BACKGROUND OF THE INVENTION Problems to be Solved by the Invention
In a chair, as in the case of attaching a tilting member to which a backrest is attached to a seat receiving body so as to be able to tilt rearwardly or a seating body to a seat receiving body so as to be able to tilt rearwardly, the bearing portion of one member and the other One member is attached (connected) to the other member by inserting the shaft into the bearing portion of the member (there may be a case where three or more members are connected by one shaft). .

In this case, when the seat body is attached to the seat support body by a shaft, the end of the shaft may be exposed to the outside, so that the appearance is not good and the human finger is not the shaft. There is a problem that it may be caught between the bearing and the bearing. There may be a gap between the bearings of both members. In this case, a cylindrical spacer (collar) is fitted on the shaft to maintain the gap between them and to prevent the bearing bush from coming off. Although it is complicated, this has a problem that it takes time to assemble.

Further, in order to prevent the shaft from coming off, it is necessary to form a flange at one end of the shaft, form an annular groove into which a snap ring is fitted, or make a hole into which a split pin is fitted. There was also a problem that it took time to process the shaft. The present invention has been made for the purpose of improving these circumstances.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a shaft member inserted into a bearing portion of one member such as a seat body is inserted into a bearing portion of the other member such as a seat receiver to thereby form a chair member. In a structure in which the shafts are attached to each other, a main body of a cap having a C-shaped cross section is fitted at least near the bearing portion of the shaft against elasticity by being pushed in from a direction orthogonal to the axis of the shaft. A cover portion that covers the end surface of the shaft is integrally provided on the main body portion of the cap.

[0006]

[Operation / Effect] With this configuration, the end surface of the shaft is covered with the cap, so that it is possible to solve the appearance problem due to the exposure of the shaft and to prevent a person from pinching his / her finger between the shaft and the bearing portion. The safety can be improved without it. Moreover, since the cap is attached to the shaft by pushing the main body against elasticity, in other words, the cap can be attached with one touch, so that the chair is assembled due to the provision of the cap. There is no increase in the labor of work.

Further, according to the second aspect of the present invention, the main body portion of the cap serves as a spacer for restricting the distance between the bearing portions of both members and for preventing the bearing bush from coming off, and moreover, the cover portion of the cap. The shaft is prevented from coming off. In other words, the cap also functions as a cover for the shaft, as a stopper for the shaft, and as a spacer that regulates the distance between the bearing portions of both members. Therefore, the conventionally used cylindrical spacer is unnecessary. In addition, it is not necessary to process the shaft with a flange or the like, and as a result, the cost can be suppressed and the assembling work can be simplified.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. (1). First Embodiment (FIGS. 1 to 5) FIGS. 1 to 5 show the first embodiment, of which FIG. 1 is a right side view of a chair, FIG. 3 is shown in FIG.
FIG. 3 is a sectional view taken along line III-III, and as shown in these drawings, the chair includes a seat receiving body 2 fixed to the upper end of a leg support 1 such as a gas cylinder, a seat body 3 attached to the seat receiving body 2, and left and right sides. A pair of rocking members 4 and a backrest 5 attached to the rocking members 4 are provided.

The seat receiving body 2 is formed in a substantially box shape having an upward opening, and its rear portion is fixed to the leg support 1. The seat body 3 includes a base 6 which is formed in a downward opening U-shape in a front view so as to cover the seat receiving body 2, and the front portion of the left and right side plates 6a of the base 6 is provided on the left and right side plates of the seat receiving body 2. The first shaft 7 is attached to the front part of 2a. In this case, the seat receiving body 2
The mounting holes 8 of the left and right side plates are formed as elongated holes extending in the rearward tilting direction in a side view. A bush 9 is attached to the mounting hole 8.

A front spring bearing 10 is fitted on the first shaft 7. The front spring bearing 11 supports the front surface of the spring, while the rear spring bearing supports the rear surface of the spring 11 inside the seat receiving body 2. A spring bearing is arranged so that it can move back and forth. Rear spring support 12
Is supported by a wedge-shaped member 13 having an inverted trapezoidal shape in a side view, and the wedge-shaped member 13 is supported by a support portion 14 fixed to the bottom surface of the seat receiving body 2 by welding or the like. Wedge-shaped member
A bolt 16 embedded in the photograph 15 arranged on the lower surface of the seat receiving body 2 is screwed into the seat 13. When the wedge 15 is rotated to move the wedge-shaped member 13 up and down, the rear spring receiver 12 moves back and forth, which changes the initial elastic force of the spring 11.

The initial elastic force of the spring 11 may be adjusted by other adjusting means, or the spring 11 may be replaced by another spring means such as a gas spring. The swinging member 4
Is located outside the base 6 of the seat 3 on the left and right,
A second shaft 17 is attached to the left and right side plates 2a of the seat receiving body 2 so as to rotate about its front end.

A plate-like bracket 18 is provided so as to project upward in the middle of the front and rear of the left and right swing members.
18 and the left and right side plates 6a of the base 6 of the seat body 3 have a third shaft.
Penetrates 19 Therefore, when a seated person leans against the backrest 5, the backrest 5 causes the spring to move around the second axis.
The seat body 3 tilts backwards against 11 and the seat body 3 moves backward while tilting backwards.

As shown in FIG. 2, the cap 20 according to the present invention is provided at each portion of the third shaft 19 outside the base 6.
Is attached. This will be described with reference to FIGS. 4 and 5. 3A is a bottom view, FIG. 3B is a perspective view with the cap 20 turned upside down, FIG. 3C is a perspective view showing a mounted state, and FIG. 5 is a sectional view taken along line VV of FIG. . The cap 20 is made of synthetic resin, and is a body portion 21 fitted on the third shaft 19 between the side plate 6a of the base 6 and the bracket 18 of the swinging member 4.
And a cover portion 22 that covers the bracket 18 from above. The main body portion 21 is formed in a C-shaped cross-section that opens downward, and the gap between the openings in the groove 23 into which the third shaft 19 fits is slightly smaller than the outer diameter of the third shaft 19 and has a constricted shape. Is formed in.

Therefore, the body portion 21 of the cap 20 has a groove
When the opening edge of 23 is strongly pressed against the third shaft 19, it is fitted to the third shaft 19 by the deformation against the elasticity.
It can also be removed by the reverse procedure. In order to facilitate fitting into the third shaft 19, the main body portion 21 is formed with a guide groove 24 having a wider radial outer space. Third
The shaft 19 is fitted with the bush 9 which is fitted into the side plate 6a of the base 6 and the bearing bracket 18 of the swinging member 4, and the body portion 21 of the cap 20 is fitted tightly between the left and right bushes 25, 26. It is set to the full size.

The cover portion 22 of the cap 20 is set so as to abut or be close to the end surface of the third shaft 19. In addition, the cover portion 22 includes the swinging member 4 as shown by a dashed line in FIG.
It may be extended downward so as to hit the upper surface of the. Needless to say, the side plate 6a of the base 6 and the bracket 18 of the swinging member 4 correspond to the bearing portion described in the claims.

As described above, the end surface of the third shaft 19 is capped.
Since it is covered with the cover portion 22 of 20, the appearance is good and the safety can be secured. Also, the cover part of the left and right caps 20
Since the movement of the third shaft 19 in the axial direction is blocked by 22, it is not necessary to take a slipping prevention device such as a snap ring, and moreover, the main body portion 21 of the cap 20 has the base 6 and the bracket 18.
Since it functions as a spacer that regulates the distance between and, the structure can be simplified and the labor of assembly can be reduced. Also,
When the bushes 25 and 26 are fitted on the third shaft 17 as in the embodiment, the cap 20 also serves to prevent the bush 9 from coming off.

(2). Second Embodiment (FIG. 6) FIG. 6 shows a second embodiment applied to the first shaft 7. In this embodiment, the first shaft 7 is rotatably fitted in the mounting hole 8 of the seat receiving body 2, in other words, the mounting hole 8 of the seat receiving body 2 is formed as a simple round hole. In the mounting hole 8 of the receiving body 2 and the mounting hole 6b of the base 6,
Bushings 27 and 28 are fitted. The bushes 27, 28 are provided with flange portions 27a, 28a, and the flanges 27 of both bushes 27, 28 are provided between the side plate 6a of the base 6 and the side plate 2a of the seat receiving body 2.
a and 28a overlap. Therefore, the bushes 27 and 28 also function as spacers.

The cap 20 of this embodiment is arranged outside the seat receiving body 2, and the flange portions 2 of the bushes 27, 28 are provided.
It is composed of a main body portion 21 fitted to the first shaft 7 through 7,28 and a cover portion 22 which spreads so as to cover the end face of the first shaft 7. As shown in the drawing (C), the main body portion 21 is formed in a C-shaped cross section, and is deformed against its elasticity so that it is fitted into the flange portions 27a, 28a of the bushes 27, 28 from below. be able to.

Incidentally, as shown in FIGS. (D) and (E), even when the flange 7a similar to the conventional one is formed on the end portion of the shaft 7 or the snap ring 29 is fitted, the cap of the present invention can be obtained. Can be applied. In this case, it is not necessary to use the conventional stock product of the first shaft 7 as it is, or to change the manufacturing equipment of the first shaft 17, so that there is a practical benefit of using the cap 20 of the present invention.

(3). Third Embodiment (FIG. 7) In the third embodiment shown in FIG. 7, a narrow second member 32 that also opens upward is attached to a wide first member 31 that opens upward. It is applied to the side plate 31 of both members 31, 32.
The shaft 33 penetrates a and 32a. This cap 20 has a shaft 33
The second member 32 includes a main body portion 21 fitted to both sides of the side plate 32a of the second member 32, and a cover portion 22 covering the end surface of the shaft 33 so as to straddle the side plates 31a of the first member 31. . The cap 20 may be integrated as shown by the chain line.

(4). Others The embodiment of the present invention is not limited to the above, and can be embodied in various forms. For example, the present invention can be applied not only to mounting a rotatable member but also to mounting a member fixedly by a shaft. Needless to say, the form of the cap can be appropriately changed according to the form of attachment of the shaft.

[Brief description of drawings]

FIG. 1 is a right side view of a chair according to a first embodiment.

FIG. 2 is a plan view of the chair with the seat body omitted.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a view showing a cap.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a diagram showing a second embodiment.

FIG. 7 is a diagram showing a third embodiment.

[Explanation of symbols]

2 seat holder 3 seat 4 Swing member 5 backrest 6 seat base 7,17,19 axis 20 caps 21 Body 22 Cover 23 groove

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-11-141518 (JP, A) JP-A-9-279915 (JP, A) Actually opened 62-76035 (JP, U) Actually opened 4- 115432 (JP, U) Actual flat 7-30013 (JP, U) Actual flat 4-27857 (JP, U) Registered utility model 3036541 (JP, U) Registered utility model 3013937 (JP, U) (58) Survey Areas (Int.Cl. ⁷ , DB name) A47C 7/14 A47C 4 / 28,4 / 42 A47C 5/04-5/12 F16B 2 / 22,3 / 03,7 / 04 F16L 39 / 04,57 / 00

Claims (2)

(57) [Claims] 1. A shaft inserted through a bearing portion of one member such as a seat body is inserted through a bearing portion of the other member such as a seat receiver, and a cross-section C is formed at least near the bearing portion of the shaft. The body portion of the cap formed in a letter shape is fitted against the elasticity by being pushed in from the direction orthogonal to the axis of the shaft, and the cover portion that covers the end face of the shaft is integrally formed with the body portion of the cap. A structure for mounting members in a chair, which is characterized by being provided. 2. The "claim 1" according to claim 1, wherein the bearing portion of the one member and the bearing portion of the other member are appropriately dimensionally separated from each other, and the main body portion of the cap is displaced between the bearing portions and cannot move. To the main body of this cap,
A structure for mounting a member in a chair, characterized in that a cover portion that covers an outer end of the bearing portion and an end portion of the shaft is integrally provided.