JP3789738B2 - Furniture bearing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing structure in furniture such as a chair.
[0002]
[Prior art]
In the synchro-type rocking chair where the seat moves backward in conjunction with the tilting of the backrest, a support base made of a metal plate with an upward opening is provided at the upper end of the leg support, and longitudinal slots are formed on the left and right side plates of the support base. In many cases, a shaft to which the seat is attached is slidably inserted back and forth into the elongated hole, thereby allowing the seat to move backward.
[0003]
In this case, when an elongated hole into which the shaft is slidably fitted is provided in the support base or the like, a cylindrical portion is formed around the elongated hole by burring in order to increase the supporting strength of the shaft (for example, Japanese Patent Laid-Open No. Hei 10-10 No. 57180). Generally, a synthetic resin bush is attached to the elongated hole.
[0004]
[Problems to be solved by the invention]
By the way, in order to increase the supporting strength of the shaft, the protruding height of the cylindrical portion may be increased. However, if the height dimension of the cylindrical portion is increased to a certain extent, breakage frequently occurs in the semicircular portions at both ends of the elongated hole. Therefore, there is a limit to increasing the support strength of the shaft.
[0005]
This is a problem that can be widely applied not only to a synchro-type chair, but also to furniture including a member that moves through a shaft.
[0006]
The present invention aims to solve this problem.
[0007]
[Means for Solving the Problems]
In the present invention for achieving the above object, a metal plate member made of elongated hole open, and a full shaft fitted in the elongated hole of the member, the metal plate members, said slot tubular portion surrounding is formed by a burring process, the member and the furniture where the axis is relative movement in the longitudinal direction of the elongated hole, the relative of the member and the shaft length of the long holes in the metal plate member By setting the dimension larger than the moving stroke, the shaft is set to move relative to the range excluding both ends of the elongated hole, and the protruding height dimension of the cylindrical portion is reduced at both ends of the elongated hole. In the range where the axis moves relatively, it was set to be large.
[0008]
[Operation and effect of the invention]
According to the present invention, since the projecting dimension of the cylindrical portion at both ends of the elongated hole is small, the support area of the shaft can be increased without incurring breakage during burring, and the cylindrical portion is Since it extends in an annular shape as a whole, the bending strength of a portion having a high protruding dimension in the tubular portion does not decrease. Therefore, according to the present invention, the supporting strength of the shaft can be remarkably improved as compared with the conventional one.
[0009]
Moreover, when the synthetic resin bush is attached to the elongated hole as in claim 2, the durability of the bush can be improved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment in which the present invention is applied to a chair will be described with reference to the drawings.
[0011]
(1). First embodiment (FIGS. 1 to 12)
1 is a right side view of a chair, FIGS. 2 and 3 are longitudinal right side views, and FIGS. 4 and 5 are separated perspective views. First, the basic structure will be described based on these drawings.
[0012]
≪Basic structure≫
The chair includes a leg 2 provided with a leg column 1 such as a gas cylinder, an upwardly opening metal plate support base 3 fixed to the upper end of the leg column 1, an upper bracket 4 covering the support base 3 from above, and an upper bracket. 4, a swing frame 5 disposed behind 4, an upper bracket 4 and a seat body 6 supported by the swing frame 5, and a back portion 7 attached to the swing frame 5.
[0013]
A flange 3 b is formed at the opening edge of the support base 3. The leg support 1 is covered with a leg cover 8, and the support base 3 is covered from below with a base cover 9 that opens upward.
[0014]
The first bracket 10 is fixed to the bottom surface of the support base 3, and the upper end of the leg column 1 is fitted to the bush 11 fixed to the first bracket 10 and the support base 3. In addition, a longitudinally long slot 12 is formed in the front portion of the left and right side plates 3 a in the support base 3, and the first shaft 13 is inserted into the slot 12 and the side plate of the upper metal fitting 4. A synthetic resin bush 22 is attached to the elongated hole 12.
[0015]
On the lower surface of the support base 3, a second bracket 14 having an open U-shape facing downward is fixed by welding. On the other hand, the swing frame 5 includes a side plate 5 a located outside the second bracket 14, and the second bracket 15 is connected to the front end portion of the swing frame 5 by the second shaft 15 penetrating the side plate 3 a of the support base 3. 14 is attached.
[0016]
Further, the swing frame 5 and the upper metal fitting 4 are connected by a third shaft 16. For example, as shown in FIGS. 4 and 5, a wing-shaped receiving plate 17 extending in the left-right direction is fixed to the swing frame 5.
[0017]
For example, as shown in FIG. 3, a downward rod 18 penetrating the swing frame 5 is non-rotatably attached to the rear portion of the support base 3, and elastically received by a spring receiver 19 provided at the tip of the rod 18. A coil spring 20 as an example of means is supported, and the swing frame 5 is received by the coil spring 20. The coil spring 20 is fitted in the holder 21.
[0018]
The back portion 7 includes a waist outer member 22 formed in a concave shape facing forward in plan view so as to wrap the waist of a seated person, and a backrest 24 attached to the waist outer member 23. The waist outer member 23 is fixed to the receiving plate 17 of the swing frame 5 with screws.
[0019]
As shown in FIG. 2, the backrest 24 includes an outer shell (outer cover) 25, an inner shell (core plate) 26 disposed in front of the outer shell 25, and a cushion 27 stretched on the front surface thereof.
[0020]
As shown in FIG. 3, the seat body 6 includes a front inner shell 28, a rear inner shell 29 connected to the front inner shell 28, and a cushion material 30 stretched in common to both the inner shells 28 and 29. .
[0021]
The front inner shell 28 is engaged with the front end portion of the upper metal fitting 4 by the first locking claw 31, and the rear inner shell 29 is engaged with the receiving plate 17 of the swing frame 5 by the second claw 32. In addition, the third claw 33 is engaged with the rib 34 of the waist outer member 23. The front inner shell 28 is provided with a downward projection 35 slidably mounted on the upper metal fitting 4.
[0022]
≪Stroke regulation and bearing structure≫
Next, the stroke restriction of the first shaft 13 and the details of the bearing structure will be described with reference to FIGS. 6 is an explanatory view of stroke restriction, FIG. 7A is a perspective view of the support base 3 and the bush 22 separated, FIG. 7B is a cross-sectional view showing the mounting state of the bush 22, and FIG. It is.
[0023]
When the seated person leans against the backrest 24, the swing frame 5 tilts backward about the second shaft 15, and the upper bracket 4 and the seat body 6 are moved backward and tilted in conjunction with this (for details, see FIG. Although omitted, the seat body 6 retreats greatly by the upper metal fitting 4).
[0024]
As shown in FIG. 6, when the third shaft 16 hits the upper surface of the first bracket 10, the rotation range of the swing frame 5 and the movement stroke of the first shaft 13 are restricted. At both left and right ends of the first bracket 10, a synthetic resin stopper 37 against which the third shaft 16 abuts is mounted for buffering (details will be described later). As shown in FIG. 3, the swinging frame 5 is restricted in its forward rotation posture by hitting the rear portion of the support base 3.
[0025]
As clearly shown in FIG. 7 and FIG. 8, an inward cylindrical portion 38 is formed by burring at the slot 12 of the support base 3, and the bush 22 is attached to the cylindrical portion 38. Yes.
[0026]
Then, the length of the long hole 12 of the support base 3 is set so that a gap is formed between the front and rear inner surfaces of the bush 22 and the first shaft 13 in the state where the first shaft 13 is fully advanced and retracted. The cylindrical portion 38 is set so as to be larger than the dimension obtained by adding the thickness of the bush 22 to the moving stroke L of the first shaft 13, and the cylindrical portion 38 protrudes at the semicircular portions at both ends of the long hole 12. The dimension is small, and the protruding dimension is set to be large in the movement range of the first shaft 13.
[0027]
Since the projecting dimension of the cylindrical portion 38 is small at both ends of the long hole 12, no breakage occurs at both ends of the long hole 12 during burring, and the cylindrical portion 38 is continuous in an annular shape. The bending strength of the portion with a large protruding dimension is high. For this reason, the support strength of the 1st axis | shaft 13 can be improved significantly.
[0028]
The bush 22 is formed with a flange 22a and a claw 22b for retaining. Further, in order to facilitate fitting into the long hole 12, the slit 22c is divided into upper and lower parts, and the vertically divided parts are connected by left and right laterally U-shaped bridges 22d.
[0029]
≪Stopper≫
Next, details of the stopper 37 will be described with reference to FIGS. 9 is a plan view of the support base 3, FIG. 10 is a sectional view taken along line XX of FIG. 9, FIG. 11 is a side view of the swing frame 5 viewed from the outside, and FIG. 12 is a sectional view taken along line XII-XII of FIG. .
[0030]
The side plate 3a and the flange 3b of the support base 3 are notched at the rear end portion of the first bracket 10 (the notch portion is indicated by reference numeral 39). A protruding portion 10 a that protrudes outward at the notch portion 39 is formed. Moreover, the engagement hole 40 is vacant in the base part of the protrusion part 10a.
[0031]
On the other hand, the stopper 37 is formed with a bag-like portion 37a that sandwiches the protruding portion 10a of the first bracket 10 from above and below, and a claw 37b that fits elastically in the engagement hole 40 of the first bracket 10. When the bag-like portion 37a hits the side plate 3a of the support base 3 from the outside, the stopper 37 is held so that it cannot be displaced left and right.
[0032]
As shown in FIGS. 11 and 12, the stopper 37 is set so as to be in contact with or in close contact with the inner surface of the swing frame 5. For this reason, the stopper 37 serves to regulate the left and right positions of the swing frame 5. It also plays the role of (left / right shake prevention).
[0033]
In this case, since the stopper 37 is made of a synthetic resin such as polypropylene, the tilt of the swing frame 5 can be smoothly guided without generating a rubbing sound due to the tilt of the swing frame 5. The stopper 37 can be mounted on the flange 3b or the side plate 3a of the support base 3.
[0034]
(2). Modification (Fig. 13)
In the modification shown in FIG. 13, the first shaft 13 is set to move through the entire long hole of the bush 22 by increasing the thickness of the left and right side portions of the bush 22. That is, the stroke of the first shaft 13 is regulated by the bush 22.
[0035]
Also in this case, since the long hole 12 is much longer than the moving stroke L of the first shaft 13, the protruding height of the support portion of the first shaft 13 in the tubular portion 38 without causing cracks in the burring process. The size can be increased.
[0036]
(3). Others The present invention can be embodied in various ways other than the above embodiment. For example, the invention is not limited to a chair, and can be widely applied to furniture in which a cylindrical portion of a metal plate member is subjected to burring and a shaft is fitted to the bar so as to be relatively movable.
[Brief description of the drawings]
FIG. 1 is a right side view of a chair according to a first embodiment.
FIG. 2 is a vertical right side view.
FIG. 3 is a longitudinal side view.
FIG. 4 is an exploded perspective view.
FIG. 5 is an exploded perspective view.
FIG. 6 is a diagram illustrating stroke restriction of a first axis.
7A is an exploded perspective view of a support base and a bush, and FIG. 7B is a cross-sectional view showing an attached state of the bush.
FIG. 8 is a cross-sectional plan view showing a mounting state of the bush.
FIG. 9 is a plan view showing a relationship between a support base and a stopper.
10 is a cross-sectional view taken along the line XX of FIG.
FIG. 11 is a side view seen from the outside of the swing frame.
12 is a sectional view taken along line XII-XII in FIG. 11 of FIG.
FIG. 13 is a diagram showing a modification.
[Explanation of symbols]
Support base as an example of member made of metal plate in 3 chairs 4 Upper metal fitting 5 Swing frame 6 Seat body 7 Back part 13 1st axis 15 2nd axis 16 3rd axis 22 Bush 37 Stopper 38 Cylindrical part

Claims (2)

A metal plate member made of elongated hole open, and a full shaft fitted in the elongated hole of the member, the metal plate members are cylindrical portion surrounding the long hole is formed by a burring and, in the furniture, wherein the member and the shaft are relatively moving in the longitudinal direction of the elongated hole,
By setting the length of the long hole in the member made of the metal plate to a dimension larger than the relative movement stroke of the member and the shaft, the shaft is set so as to relatively move in a range excluding both ends of the long hole, The protruding height dimension of the cylindrical portion is set to be small at both ends of the elongated hole and large in the range in which the shaft moves relative to each other.
Furniture bearing structure. The furniture is a chair,
A support base made of a metal plate that opens upward is fixed to the upper end of the leg support, and a long hole surrounded by a cylindrical portion is provided on the left and right side plates of the support base so as to extend substantially in the front-rear direction. A shaft on which the load of the seat body and the backrest acts is slidably inserted in the elongated hole through a synthetic resin bush, and the protruding dimension of the cylindrical portion is semicircular at both ends of the elongated hole. Is set to be low in the area and large in the range in which the shaft moves relative to each other.
The bearing structure for furniture according to claim 1.

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