JP3748771B2 - Rocking chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rocking chair that lifts and lowers a seat body with a leg column made of a gas cylinder.
[0002]
[Prior art]
In general, a rocking chair whose seat is raised and lowered by a gas cylinder generally has an upwardly opening seat support fixed to the upper end of the gas cylinder and supports the seat directly or through an intermediate bracket. A pin that penetrates the left and right side plates pivotally supports the swinging frame to which the backrest is attached so that the swinging frame can be tilted rearward and supports the rear tilting of the swinging frame with a spring.
[0003]
In addition, the seat body is attached to the seat receiver so as to be able to move backward and backward, and the seat body and the swing frame are connected by a pin so that the seat body tilts backward in conjunction with the back tilt of the backrest. A synchro-type chair that is designed to retreat is also widely known.
[0004]
[Problems to be solved by the invention]
By the way, there is a limit to the lifting stroke of the gas cylinder. In this regard, when the seat body feels low despite the upper limit height, it can be dealt with by laying a cushion on the seat body. However, if the seat feels high despite the lower limit height, there is no way to deal with it and the user has to put up. Therefore, it is preferable to raise and lower the seat so that the lower limit height position is as low as possible in accordance with a person with a short height.
[0005]
In this regard, it is considered that the gas cylinder may be mounted as high as possible on the seat.
[0006]
However, in order to allow the pivoting of the swing frame, a certain amount of dimension is required from the pivot center of the swing frame to the lower surface of the seat body. Increasing the mounting position of the gas cylinder under the condition that it is directly attached to the receiver inevitably requires a design change in the seat receiver to a deeper depth, which increases the size and weight of the receiver. May increase.
[0007]
In addition, since the wall thickness of the seat is naturally limited, it is difficult to improve the mounting strength of the gas cylinder.
[0008]
The present invention aims to solve these problems.
[0009]
[Means for Solving the Problems]
Chair according to the invention of claim 1 includes a gas cylinder as leg support post, a seat receiving fixed to the upper end of the gas cylinder, and supported the seat support in the receiving seat, the swing frame back is rather attached , Ru Tei and an elastic means for elastically supporting the tilt after the swing frame.
[0010]
The seat receiver includes a bottom plate and left and right side plates, and is open upward. An upper plate that overlaps the lower surface of the seat receiver and an upper plate that overlaps the lower surface of the seat receiver. A bracket having a U-shaped downward opening in front view and having left and right side plates protruding downward from the left and right ends of the plate is fixed, and the upper end of the gas cylinder penetrates the bottom plate of the seat and the upper plate of the bracket. At the same time, the swing frame is attached to the left and right side plates of the bracket by means of left and right longitudinal pins.
[0011]
According to a second aspect of the present invention, in the first aspect , the upper end of the bush is fixed to the support member fixed to the seat support by welding, while the lower plate of the bush is formed on the upper plate of the bracket. A fitting hole that fits tightly and a plurality of cutouts in a state where the inner periphery of the fitting hole is partially expanded are formed, and the bush and the seat support are fixed by welding at the cutout portion. ing.
[0012]
[Operation and effect of the invention]
According to the present invention, since the rotation center of the swing frame can be lowered, the distance between the upper surface of the seat body and the upper end of the gas cylinder can be reduced. Therefore, even if it is a gas cylinder of the same raising / lowering stroke as before, the lower limit height of the seat body can be lowered, and satisfaction can be given to a person with a short height.
[0013]
The bracket is sufficient if it has the strength to pivotally support the swinging frame, and it is not necessary to use a large-sized bracket. Therefore, an increase in weight can be suppressed as compared with a case where the seat receiver is increased in size.
[0014]
Furthermore, since the bottom plate of the seat receiver is reinforced by the bracket, the mounting strength of the bush can be remarkably increased, and as a result, the mounting strength of the gas cylinder can also be improved.
If comprised like Claim 2, attachment strength can be improved further.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0016]
1 is a right side view of a chair, FIG. 2A is a longitudinal side view, FIG. 1B is an enlarged cross-sectional view of the main part, FIG. 1C is a cross-sectional view taken along CC of FIG. FIG.
[0017]
The chair includes a leg 2 having a gas cylinder 1 as a leg support, an upwardly-opening seat receiver 3 fixed to the upper end of the gas cylinder 2, an intermediate bracket 4 covering the seat receiver (base) 3 from above, and an intermediate bracket. 4, a swing frame 5 disposed behind 4, a seat body 6 supported by the intermediate bracket 4 and the swing frame 5, and a back portion 7 attached to the swing frame 5.
[0018]
The seat receiver 3 includes a bottom plate 3c and a side plate 3a, and a flange 3b is formed at the opening edge. The gas cylinder 1 is covered with a leg cover 8, and the seat support 3 is also covered from below with a base cover 9 that opens upward.
[0019]
A support member 10 is fixed to the bottom surface inside the seat receiver 3, and the upper end of the bush 11 to which the upper end 3 of the gas cylinder 1 is fitted is welded to the support member 10 . In addition, a longitudinally long slot 12 is formed in the front portion of the left and right side plates 3 a in the seat receiver 3, and a first pin 13 is inserted into the slot 12 and the side plate 4 a of the intermediate fitting 4.
[0020]
The lower surface of the bottom plate 3c in the seat receiving 3, the front view downwardly opening U-shaped bracket 14 having a top plate 14d with a pair of right and left side plates 14a are fixed by welding or screwing. On the other hand, the oscillating frame 5 is provided with a side plate 5a located outside the bracket 14, bracket the front end portion of the oscillating frame 5, by the second pin 15 extending through the side plate 3a of the seat receiving 3 14 side plates 14a .
[0021]
Therefore, the pivot center of the swing frame 5 is located considerably below the upper end of the gas cylinder 1. As shown in FIG. 2 (B) (C), the upper plate 14d of the bracket 14, and the whole fitting hole 14b closely fitted bush 11, in a state where the inner circumferential partially unfolded fitting hole 14b are formed with a plurality of notches 14c, the bushing 11 is welded to the receiving seat 3 in place of the notch 14c, it is welded to the bracket 14 and the seat receiving 3.
[0022]
The swing frame 5 and the intermediate bracket 4 are connected by a third pin 16. For example, as shown in FIG. 3, a wing-shaped receiving plate 20 that spreads in the left-right direction is fixed to the swing frame 5. The rear part of the seat body 6 is supported by a receiving plate 20. Moreover, the support | pillar of an armrest apparatus can be fixed to the outer surface of the inclination part of the receiving plate 20 with a screw.
[0023]
When the swing frame 5 is tilted backward, the third pin 16 also rotates downward about the second pin 15, but the side plate 3a of the seat support 3 is cut away (the cutout portion is indicated by reference numeral 3a '), By applying the pin 16 to the upper surface of the support member 10, the rotation limit of the swing frame 5 or the like is restricted.
[0024]
In this case, a shock-absorbing stopper 10 'made of rubber or the like is fitted into a hole formed in the support member 10 so as to reduce the impact when stopping the rotation. The buffer stopper 10 ′ may be adhered or screwed to the upper surface of the support member 10.
[0025]
As shown in FIGS. 1 and 2, a downward rod 17 penetrating the swing frame 5 is non-rotatably attached to the rear portion of the seat receiver 3, and a spring receiver 18 provided at the lower end portion of the rod 17 A coil spring (not shown) as an example of the elastic means is supported, and the swing frame 5 is received by the coil spring. The coil spring is fitted in the holder 19.
[0026]
The back portion 7 includes a waist outer member 21 formed in a concave shape facing forward in plan view so as to wrap the waist of a seated person, and a back support 22 attached to the waist outer member 21. The waist outer member 21 is fixed to the receiving plate 20 of the swing frame 5. As shown in FIG. 2, the back support 22 includes an outer shell 22a, an inner shell 22b disposed in front of the outer shell 22a, and a cushion 22c stretched on the front surface thereof.
[0027]
In the above configuration, since the second pin 15 that is the rotation center of the swing frame 5 is located considerably below the upper end of the gas cylinder 1, the lower lower limit height of the seat body 6 is lowered to reduce the height. Even those with low abilities can sit in a stable state.
[0028]
Then, since the seat receives 3 without enlarging, sufficient by providing the weight of the bracket 14 of the necessary minimum, it is possible to suppress the increase in weight. Further, since the bracket 14 and the seat receiving 3 is attached bush 11 is taken to the part became two-ply, even higher attachment strength of the gas cylinder 1.
[0029]
In particular, as in this embodiment, the bracket 14, to form a closely fits the fitting hole 14b into the bush 11 and the bracket 14 and the seat receiving 3 welded around the bush 11, more the mounting strength It can be improved further.
[0030]
In addition, when the support member 10 is also used as a stopper for the third pin 16 as in the present embodiment, the third pin 16 can be received in a stable state over a wide area, and thus durability can be improved.
[Brief description of the drawings]
FIG. 1 is a right side view of a chair according to a first embodiment.
2A is a longitudinal right side view, FIG. 2B is a partially enlarged view, and FIG. 2C is a cross-sectional view taken along the CC line in FIG.
FIG. 3 is an exploded perspective view of a seat receiver, an intermediate metal fitting, and a swing frame.
[Explanation of symbols]
1 Gas cylinder 3 seat receiving 4 intermediate sleeve 5 oscillating frame 6 seat member 10 supporting member 11 the bush 14 bracket <br/> 15 second pin

Claims (2)

Elasticity and the gas cylinder as a leg support post, a seat receiving fixed to the upper end of the gas cylinder, and supported the seat support in the receiving seat, the swing frame back is rather mounted, tilting after the swing frame And elastically supporting means,
The seat receiver includes a bottom plate and left and right side plates, and is open upward. A bracket with an open U-shape facing downward and having left and right side plates protruding is fixed,
The upper end of the gas cylinder penetrates the bottom plate of the seat receiver and the upper plate of the bracket and is fitted to a bush fixed to the bottom plate of the seat receiver, while the swing frame is fixed by left and right longitudinal pins. It is attached to the left and right side plates of the bracket so that it can tilt backwards.
Rocking chair. The upper end of the bush is fixed to the support member fixed to the seat support by welding, while the upper plate of the bracket has a fitting hole into which the lower part of the bush fits tightly, and an inner periphery of the fitting hole A plurality of notches in a partially expanded state, and the bush and the seat support are fixed by welding at the notch locations.
The rocking chair according to claim 1.

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