JPH0439709Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application This invention relates to the improvement and creation of a reclining device for varying the angle of the backrest of a chair.

B. Prior Art It is well known that there is a reclining device in which the backrest of a chair is swingable to vary its angle in order to obtain a desired sitting posture.

In this case, instead of simply changing the angle of the entire backrest, it is possible to have more flexibility by dividing the backrest into two sections, upper and lower, corresponding to the back and hips, and making it possible to change the angle of each. It is clear that it is useful to be able to obtain a seated position.

C. Problems to be solved by the invention However, in the conventional chair reclining device, each member whose angle is to be varied is sequentially arranged such that the lower backrest is connected to the seat, and the upper backrest is connected to the lower backrest. Since the chairs were pivoted in a stacked manner, if an attempt was made to create a chair with the backrest section divided into upper and lower sections as described above, the following problems would arise, and this implementation would not necessarily be practical.

First, the angle of inclination of the upper backrest is in a relative relationship with the angle of inclination of the lower backrest, so if the lower backrest is tilted, the angle of inclination of the upper backrest will also change accordingly. If it is desired to recline only the backrest, the angle of the upper backrest must be adjusted accordingly, which is inconvenient.

Secondly, the operation part of conventional chair reclining devices is located at the pivot point of each member, and when the backrest is made up of two levels, upper and lower, this is inevitably located at the pivot point of the upper backrest and the lower backrest. However, if the reclining drive is performed manually, it is difficult to reach the pivot point while seated, which causes ergonomic problems, and if the reclining drive is performed by power, the power mechanism does not fit the pivot point. It protrudes from the landing area, causing problems in terms of aesthetics and space efficiency.

D. Means for solving the problems The purpose of this invention is to provide a reclining device that solves the problems mentioned above. The most important feature of the structure is that each member of the upper backrest can be connected and reclined.

That is, the first link 1 of this link mechanism L is fixed along the vertical direction of the lower backrest Y, and the second link 2 adjacent to the upper side of this link 1 is fixed along the front and rear direction of the upper backrest X. By doing this, the upper and lower backrests are connected, and then the backrest is connected by pivoting the pin a at the connection point between the first link 1 and the fourth link 4 adjacent to the lower side of this link to the rear end of the chair seat Z. A reclining operation part which controls the reclining operation by connecting the entire backrest to the seat and further providing rocking mechanisms 1R and 4R to each of the first link 1 and the fourth link 4 to swing around the pin a. It is something to do.

E. Function The function of the reclining device of this invention will be explained below based on the attached drawings.

First, when the first link 1 and the fourth link 4 are swung together by the oscillating mechanisms 1R and 4R, the link mechanism L has two fixed nodes (the first link 1 and the fourth link 4). It does not act as a link mechanism, and the upper backrest X and lower backrest Y swing together around the pin a connected to the seat Z like a normal chair (see FIG. 2).

Next, when only the fourth link 4 is swung while the first link 1 is fixed, the lower backrest Y is fixed as it is, but in the link mechanism L, the first link 1 is just at the fixed joint. Since the second link 2 and the fourth link 4 act as levers,
The upper backrest X supported by the second link 2 swings in synchronization with the swing of the fourth link 4 (see FIG. 2).

Then, when only the first link 1 is swung with the fourth link 4 fixed, the lower backrest will oscillate about the pin a with the seat Z, but in the link mechanism L, the Since the fourth link 4 becomes a fixed node and the first link 1 and third link 3 act as levers, the upper backrest X supported by the second link 2 is connected to the fourth link 4 regardless of the inclination angle of the first link 1. The parallel state, that is, the same angle is maintained regardless of the inclination angle of the lower backrest Y (see Fig. 4).

Embodiment FIG. 1 is a diagram showing an embodiment of the reclining device of this invention.

In this embodiment, the first link 1 of the link mechanism L has pivot joints at both ends of the lower backrest Y in the vertical direction.
Similarly, the second link 2 is constructed integrally with the upper backrest Y by providing pivot joints at both ends of the upper backrest Y in the front and rear directions.

The third link 3 is formed into a rod shape having the same wheelbase as the first link 1, and the fourth link 4 is formed into a bent lever shape having the same wheelbase as the second link 2. The links are sequentially connected clockwise by pins a, b, c, and d, of which pin a, which connects the first link 1 and the fourth link 4, is pivoted to the rear end of the seat Z at the same time.

In the figure, 1R and 4R are swing mechanisms for swinging the first link 1 and the fourth link 4 for reclining operation.

In this embodiment, the lever portion 1a is formed by extending the lever from the lower end of the lower backrest Y,
This lever portion is pivotally connected to the operating rod 1b that can move in the front-rear direction of the seat Z of the chair by a pin e to form a swinging mechanism 1R, and the fourth end of the fourth link configured in a bent lever shape is connected to the lever portion 4a. This lever portion is pivotally connected to an operating rod 4b movable in the longitudinal direction of the seat Z by a pin f, thereby forming a swinging mechanism 4R.

Incidentally, by moving the above-mentioned operating rods 1b and 4b back and forth manually or by a power mechanism, the upper backrest X and the lower backrest Y are swung to perform a reclining operation. The reclining operation is performed by applying a biasing force in the reclining direction by shifting your weight to the backrest, and a biasing force in the reclining release direction by the spring to the operating rod, and adjusting the stop position of the rod using the stopper mechanism. Of course, this is a good thing.

G. Effects of the device This device with the above configuration has the following unique effects.

(a) The backrest is divided into upper and lower parts, and the angle can be adjusted individually, so the backrest can be shaped to suit the situation, for example, to support constant body pressure or to support only the lower back. Since the chair can be freely adjusted, it is possible to create a chair that is extremely comfortable to sit on and reduces fatigue.

(b) As explained in detail in the function section, if the rocking mechanisms of the upper backrest and lower backrest are moved together, the entire backrest can be rocked, but if they are moved individually, the upper backrest and lower backrest can be moved. can be independently swung without affecting their respective angles, making it possible to easily obtain a desired backrest shape without considering mutual angular relationships.

(c) In the above case, if the swinging mechanism is operated by the operating rods as in the embodiment, the backrest angle can be determined just from the linear positional relationship of the two operating rods, making it extremely ergonomically operable. Furthermore, even when using a power mechanism, control is extremely easy.

(d) The swinging mechanism, which is the reclining operation part, is all located below the chair using a link mechanism, which not only improves aesthetics and operation, but also saves space below the seat of the chair, which until now was a dead space. It is ideal for reclining devices for automobiles, where space efficiency is particularly important.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an embodiment of the reclining device of this invention, and FIGS. 2 to 4 are partially cutaway side views of the same with the backrest angle varied. Symbols in the figure: X... Upper backrest, Y... Lower backrest, Z... Seat, L... Link mechanism, 1... First link, 2... Second link, 3... Third link , 4
... Fourth link, 1R... Swinging mechanism, 4R... Swinging mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a chair whose backrest is divided into upper and lower halves, with an upper backrest X and a lower backrest Y, each of the first, second, third, and fourth links is moved clockwise. A link mechanism L that forms a parallelogram by sequentially pivoting is prepared, and the first link 1 of this link mechanism L is fixed along the vertical direction of the lower backrest Y, and the first link 1 is adjacent to the upper side of this link 1. The upper and lower backrests are connected by fixing the second link 2 along the front and back direction of the upper backrest X, and then the first link 1 and the fourth link 4 adjacent to the lower side of this link
The entire backrest is connected to the seat by pivoting the pin a at the pivot point to the rear end of the seat Z of the chair, and further connecting each of the first link 1 and the fourth link 4 with the pin a as an axis. Rocking mechanism 1 to swing
A reclining device for a chair, characterized in that a reclining operation section is formed by providing R and 4R. 2 The end of the first link 1 is extended from the pin a point to form a lever portion 1a, and this lever portion is an operating rod 1 that can be moved in the front-rear direction of the chair seat Z.
b is pivoted to form a swinging mechanism 1R, and the 4th end of the fourth link is bent and extended downward from the pin a to form a lever portion 4a, and this lever portion can be moved in the front-rear direction of the seat Z. The swing mechanism 4R is pivoted to the operating rod 4b.
A reclining device for a chair according to claim 1 of the utility model registration claim.