JPH0321205A - Elevating device in four leg chair - Google Patents

Abstract

PURPOSE:To easily change the height of the seat of a chair by fitting four stationary legs to a seat frame to which the seat is attached, and by providing expandable legs each of which extends and retracts from and into the associated stationary leg. CONSTITUTION:Four stationary legs 4 are attached to a seat frame 3, and each of the four stationary legs 4 is incorporated with an expandable leg 5 which extends and retracts from an into the stationary leg 4 so as to change the height of a seat. A torque from a motor 6 is transmitted to a large bevel gear 10 through a worm 7, a worm gear 8 and a shaft 9, and is then transmitted to four output shafts 12 through four small bevel gears 11 meshed with the large bevel gear 11. A slit-like groove 5 formed in the expandable leg 5 is slidable along a locking-arm 19a but is unrotatable. The power of the motor 6 is transmitted to four screw shafts 16 on the legs of the chair. The screw shafts 16 are each engaged with threaded parts formed in the bottom parts 5b of the expandable legs 5 which are therefore extended for retracted, and accordingly, it is possible to easily adjust the height of the chair.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a lifting device for a four-legged chair.

[Prior art] Conventionally, a chair that can be raised and lowered by force is
A typical chair is a one-post type chair with a shilling placed in the center.

A typical chair with four legs is a binoculars chair.The lifting device for this chair has a pantograph type link between the top of the legs and the seat, and lifting and lowering is done manually. .

[IIWfi to be solved by the invention] In a single-post type chair, the seat is supported by a single shaft, resulting in poor stability. When using the sashiko as a barber/beauty chair, it had the disadvantage that it obstructed the practitioner's feet.

In addition, in a chair with four legs such as a piano chair, the problem of technical labor to raise and lower the legs at the same time using mechanical force for t * 1 m's has not been solved, and in the market there is no mechanical lifting and lowering of four-legged chairs with clear foot space. There was a demand for the development of a device.

The present invention is intended to meet these needs.

[Means for determining ffff 1 A] Four sets of fixed legs and III legs that go in and out from the fixed legs are provided on the seat frame to which the chair rate is attached.

(b) A gear V& position is provided approximately at the center of the lower surface of the seat frame to divide the power from the motor into the four sets of fixed legs {ζ}, and the screw shaft provided in the hollow part of the fixed legs transmits the power.

C) The tip of the screw shaft has a bar-shaped arm, and is attached to a stopper that is fixed integrally with the tip of the fixed leg, so that movement in the axial direction of the screw shaft is restricted, but rotation is free. .

2) A telescoping leg is provided in the hollow portion of the fixed leg, which has a slit that is guided by the arm of the stopper, and whose bottom portion is threadedly engaged with the screw shaft to protrude or retract from the fixed leg.

[Sakukawa] With the above configuration, forward and reverse power is transmitted to each leg by rotating the motor in the forward and reverse directions, and the threaded shaft provided in each leg and the screw at the bottom of the telescopic leg are screwed together. Since the legs are protruded or retracted by 1 m by Cζ, the height of the chair can be easily changed.

Also, compressive force acts on each leg due to gravity, but the tip of the screw shaft that transmits power is supported by the tip of the fixed leg via a metal fitting, while the screw shaft is connected to the top of the screw shaft. However, Shinji! It is designed to apply the reaction force of gravity through the bottom of the legs, and only tension always acts on the screw shaft.

In this way, even if the lifting stroke of the chair is increased, that is, the screw shaft is lengthened, no buckling force acts on the screw shaft, so lII
NIl1 can be taken in and out smoothly.

[Example] If the example of the present invention is described based on the drawings, the first and second examples are as follows.
・From Figure 3, the symbol l is the seat, the second back is also t, and the third seat frame has four sets of fixed legs 4 attached to the base frame 3, and each fixed leg 4 has an extendable leg 5 that goes in and out to adjust the rate. The height of the can be changed.

The operation of the extension 1K1$6 is to first rotate the large bevel groove 0 through the worm 7, worm gear 8, and shaft 9 using the rotational force of the motor 6, and then to rotate the four small bevel grooves 0 by the four small bevel gears I1 that mesh with these. be transmitted to the output shaft 12.

Each output shaft l2 has a joint 13, a flexible shaft l5, and a joint l.
A screw port 16 integrally connected to the joint 14 through the
transmits rotational force to. The flexible shaft 15 is designed to change the direction of rotational force transmission by about 90 degrees, but it is also possible to change the direction by using the umbrella 7I groove 7.18 as shown in FIG.

Furthermore, if we explain the wJ region in which the rotational force of the screw shaft 16 moves the elongated cypress leg 5 in and out using Figures 4, 5, 6, and 7, the fixed leg 4
A notch 4a is provided at the tip of the cutout 4a, and the bar-shaped arm 19a of the stopper I9 is fitted into the cutout 4a.
} is fixed at 20.

The tip of the screw shaft 16 is cylindrical, and the entire stopper 19
It should be inserted into the center hole of and its movement in the axial direction should be restricted with nuts 1 and 2l. The slot-shaped groove 5a provided with the ntam 5 1 is slidable on the bar-shaped arm 19a, but the direction of rotation is restricted. Also, the bottom part 5b of the extension rails should be screwed into the screw shaft 16.

A larger guide 5c is provided at the tip of the telescopic leg 5, and the arm 23a of the stopper 23 is fitted into the groove 50, and further fixed with a nut 22, so the shape and dimensions of the slit-shaped groove 5a are Guaranteed. Also, the stop metal fitting 23 has an adjustment screw 24.
Screw them together, and use the same IA cram screw 24 to adjust the height between each leg. Reference numeral 25 is a gear box;
26 Kapha, 27 and 28 indicate the same seat.

In the above structure, we have described the method of transmitting the power of the motor 6 to the four screw shafts 16 via the worm U wheel, bevel gear, and the retractable shaft 15, etc. However, there is a difference in this method! Not a fake,
The proximal force may be transmitted to the screw shaft groove i using a flat wheel, a helical gear, a flexible shaft l5, or the like.

Also fixed Vl4. The shape of the pipe is not limited to a circular pipe, but may be a square pipe.

Effect of F] If configured as described above, the power of the motor 6 will be the power of the four motors of the chair? The transmission is transmitted to the threaded shaft 16 of the + groove, and the direction shaft 16 is provided on the bottom 5b of the telescoping leg 5 and is screwed into the t-connection part to form the + groove 1.
The height of the chair can be easily adjusted to 1 by pushing out or retracting the shortened legs 5.

In addition, compressive force due to the weight of the human body acts on each leg of the flexor, and compressive force generally acts on the mechanical part (screw shaft 16 in the present invention) that pushes out the leg, so buckling of the mechanical part, etc. Although there is a problem that it is difficult to take a large lifting stroke, in the present invention, the screw shaft 1 is
Supports the tip of 6, and the same axis of 16! ! Since the force applied from the bottom part 5b of the retractable leg 5 is supported at exactly the same point, only a tensile force is always applied to the screw shaft 16, allowing the leg with a large lifting stroke to operate smoothly.

[Brief explanation of the drawing]

Fig. 1 is a side view of a four-legged chair equipped with an elevating device according to the present invention, Fig. 2 is an explanatory diagram of the rocky shore structure for elevating and lowering tA@, Fig. 3
The figure shows another embodiment of the lifting device mechanism, FIG. 4 is a partial sectional view of the leg assembly, and FIG. 5 is an extended view taken from the direction A-8 in FIG.
@Legs, Figure 6 is the C-DWI view of Figure 4, Figure 7 is the 4th
The E-F diagram of the figure is shown.

Claims (1)

[Claims] A) Fixed legs (4) having a hollow structure on the lower surface of the seat frame (3)
Four sets of fixed legs (4) are attached, and extendable legs (5) are provided that go in and out of the hollow part of the fixed legs (4). b) A motor (6) and a gear device are installed on the lower surface of the seat frame (3) to distribute the power from the motor (6) to each fixed leg (4), and the motor (6) is installed in the hollow part of the fixed leg (4). Power is transmitted to the screw shaft (16). c) The tip of the screw shaft (16) has a bar-shaped arm (19a).
) and is fixed integrally with the tip of the fixed leg (4) to support the force in the axial direction and to be freely rotatable. d) The telescopic leg (5) provided in the hollow part of the fixed leg (4) has a slit-shaped groove (5a) that is guided by the arm (19a) of the stopper (19), and has a bottom part (5b). is the screw shaft (
16) and protrudes or retracts from the fixed leg (4). A lifting device for a four-legged chair, characterized by comprising the above items a) to d).