JPH0736778B2 - Chair with backrest - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair with a backrest used in offices and the like.

[0002]

2. Description of the Related Art With the progress of new offices and the improvement of intellectual productivity in recent years, various chairs making full use of ergonomic theory have been provided. In particular, various studies and trials have been made on a chair having a function of making the movement of the backrest in line with the reclining trajectory of a person so that the backrest does not occur when leaning against the backrest.

[0003]

However, all of the ones tried so far are not structurally robust and inferior in durability, the tilting motion of the backrest is not smooth, and the mechanism is complicated. However, there is a drawback that it takes a lot of space.

An object of the present invention is to provide a chair with a backrest that solves the above-mentioned drawbacks.

[0005]

In the above object, the present invention is directed to a horizontal side of an L-shaped backrest support rod on the rear side of a recess extending in the front-rear direction provided in a central portion in the width direction of a seat receiving body. In the aspect in which the backrest is tilted in the front-rear direction with the virtual axis set above the seat and at the approximate hip joint axis position in front of the backrest as the central axis, Is connected to the seat receiving body through a front and rear slide mechanism formed by a pin and an arcuate slit, and is equipped with a biasing means for biasing the backrest in the standing direction. Is the gist.

[0006]

Embodiments Next, embodiments will be described with reference to the drawings.

In the chair shown in FIG. 1, (1) is a seat receiving body, (2) is a backrest support rod, and (3) is a leg column.

The seat receiving body ( 1 ) is composed of a pair of left and right side plates (4).
(5) and the bottom plate (6) are integrally connected to each other to form a concave portion (7) extending in the front-rear direction inside by a metal member having an upward U-shaped cross section, and the concave portion (7) has a long length. It is formed so that it is deepest in the middle part in the depth direction and slightly rearward, and becomes shallower toward the front end part. The bottom plate (6) is provided with an opening (8) at its deepest portion. Further, arc-shaped slits (9) and (10) that are inclined obliquely downward toward the front are formed symmetrically on each of the both side plates (4) and (5) at the rearmost portion. The horizontal plates (11) and (12) are integrally connected to the upper edges of the side plates (4) and (5) so as to project outward, and the seat plate (13) serves as a fastening member such as a bolt. It is supposed to be attached.

The backrest support rod (2) is a strip-shaped bottom plate (15).
A vertical side portion (19) having a U-shaped cross section in which rising side plates (16) (17) are connected to both side edges of the vertical side portion, and a backrest (18) is attached to the vertical side portion (19). It is made of an L-shaped metal member in a side view, which is composed of a horizontal side portion (20) connected to the lower portion of (19). The horizontal side portion (20) is formed in such a width that it can be arranged in the recess (7) of the seat receiving body (1). Then, at the tip of the horizontal side (20), arcuate slits (21) (22) are formed symmetrically on both side plates (16) (17), which are inclined obliquely downward toward the front. .

At the upper end of the column (3), the horizontal distance of the backrest support rod (2) is narrower than the distance between the side plates (4) and (5) of the seat receiving body (1). A pair of left and right flanges (24) (25) which are parallel to each other and are wider than the distance between the side plates (16) (17) of the section (20) are provided in a standing state.

The seat receiving body (1) and the backrest support rod (2) are connected as follows.

That is, the horizontal side portion (20) of the backrest support rod (2)
The front end portions of both side plates (16) (17) are arranged in parallel with and adjacent to both side plates (4) (5) in the deepest part of the recess (7) of the seat receiving body (1). From the other side, the front pin (in the state of penetrating both slits (21) (22) of the horizontal side part (20) of the backrest support rod (2) and the side plates (4) (5) of the seat receiving body (1). 27) is attached.

Also, the horizontal side portion (2) of the backrest support rod (2)
The base end of (0) has the base ends of both side plates (16) (17) of the horizontal side (20) in the rear end of the recess (7) of the seat receiver (1). The side plates (4) and (5) on the side are arranged so as to be parallel and adjacent to the rear ends of the side plates (4) and (5), and in that state, both slits (9) and (10) on the side of the seat receiving body (2) and the backrest support rod. The rear pin (28) is attached to the horizontal side portion (20) of (2) so as to pass through both side plates (16, 17).

The backrest (18) attached to the vertical side portion (19) of the backrest support rod (2) with the above-described connecting structure.
The front and rear pins (27) (28) have slits (9) (10)
(21) By sliding in (22), the virtual horizontal axis (A) in the left-right direction set above the seat (13) and in front of the backrest (18), that is, the user About the waist joint axis line as the central axis line, the user is tilted in the anteroposterior direction according to the reclining trajectory of the person. In order to realize such a tilting motion, the front and rear slits (9) (10) (21) such as the relative positional relationship of the front and rear pins (27) (28) and the distance between them.
It goes without saying that the shape, orientation, relative positional relationship, spacing distance, etc. of (22) are set in a predetermined manner.

The pin (30) is supported horizontally between the side plates (4) and (5) at the tip of the recess (7) of the seat receiving body (1), and the backrest support rod (2) is supported. Pins (31) are also provided at the tip of the horizontal side (20), and both pins (30) (31)
The compressed gas spring (3
The front and rear ends of 3) are attached in a hinged state.

By the action of this gas spring (33),
The horizontal side portion (20) of the backrest support rod (2) is urged rearward and in the direction in which the backrest (18) stands up, so that the backrest (18) always maintains the standing state. Has been done.

On the other hand, the seat receiving body (1) and the column (3)
Are interconnected as follows.

That is, by utilizing the opening (8) of the seat receiving body (1), both flanges (24) (25) at the upper end of the column (3).
Is arranged in parallel between the side plates (4) (5) at the deepest part of the recess (7) and the side plates (16) (17) of the horizontal side part (20) of the backrest support rod (2). The front pin (27) simultaneously penetrates the flanges (24) (25). As a result, the seat receiving body (1) becomes the front pin (27).
It is rotated like a seesaw around the axis.

Then, in the recessed portion (7) of the seat receiving body (1), at a position lower than the pivotal support portion of the flanges (24) (25) by the front pin (27), the pin is provided at the upper end portion of the column (3). (35) is provided, and the front and rear ends of the lock type gas spring (36) in the compression state which operates in the extension direction are hinged between the pin (35) and the pin (30) at the tip of the seat receiving body (1). Connected to the state.

As a result, the seat receiving body (1) maintains a predetermined inclined state in the locked state of the gas spring (36) by the link mechanism having the three pins (27), (30) and (35) as nodes. At the same time, the tilt angle of the gas spring (36) is changed steplessly in the unlocked state.

In this way, the seat receiving body (1) and the support column (3)
And a front pin (27) used for connecting the seat receiving body (1) and the backrest support rod (2) together,
Pin (3) to connect each end of gas spring (33) (36)
The number of parts to be used is reduced and the internal mechanism is made compact by being used together with (0).

Reference numeral (38) is a device for operating the switch (36a) of the lock type gas spring (36), and the tip portion is rotated to the tip portion inside the recess (7) of the seat receiving body (1). A short lever (39) with a fulcrum, a switch actuation part in the middle part, and a power point at the base end part is provided, and one end of the core wire (40a) of the operation cable (40) is connected to the power point of the lever (39). Has been done. That is, when a tensile force is applied to the other end of the core wire (40a) of the operation cable (40), the lever (39) is rotated about the fulcrum at the tip, and the lever middle portion is a switch (36) of the gas spring (36). Press 36a) to unlock the gas spring (36). Also, if the pulling force to the other end of the core wire (40a) of the operation cable (40) is removed, the gas spring (3
6) automatically returns to the locked state.

Incidentally, a portion where the respective constituent members are in sliding contact with each other,
Specifically, between the front pin (27) and the slits (21) (22), the flanges (24) (25) and the side plate (4) of the recess (7).
Flange (24) (25) and horizontal side (20) between (5)
Between the side plates (16) (17), between the rear pin (28) and the slits (9) (10), the side plates (4) (5) of the recess (7) and the side plates of the horizontal side (20). Between the (16) and (17), a resin member (42) for improving the sliding property is arranged, or a lubricant such as grease is applied.

In the chair having the above structure, as shown in FIG. 2, when the backrest (18) leans against it, the pins (27) (28), the slits (9) (10) (21) ( 22) Sliding action to set the user's approximate hip joint axis
It tilts rearward with the virtual horizontal axis (A) as the central axis. Therefore, the user does not feel a back slip in the reclining posture. Also, when returning to the work position, the user is also required to use the biasing action of the gas spring (33) and the sliding action of the above slide mechanism (27) (28) (9) (10) (21) (22). I do not feel a sense of dislocation.

Also, as shown in FIG. 3, the seat (13)
To adjust the angle of the gas spring (36), press the switch (36a) of the lock type gas spring (36) and change the weight. When returned to the state, the seat (41) is fixed in that angular state.

[0026]

As described above, in the chair with a backrest according to the present invention, the backrest is located above the seat portion and in the left-right virtual horizontal position set at a substantially waist joint axis line position in front of the backrest. as configured to be tilted in the longitudinal direction axis as the center axis, to realize the function of those in line with the backrest movement reclining track people live back shift feeling
Not only can this be prevented from happening, but this
As a configuration for implementing a function such as, a horizontal side portion and the seat receiving member of the backrest支杆, because configuration linked through the front and rear slide mechanism by a pin and arcuate slits are employed, structurally robust in that to a superior durability
In addition to being able to perform, mechanical simplification and compactness can be achieved. Moreover, since the above-mentioned backrest movement is realized by sliding the pin in the arcuate slit, the movement is smooth and does not make the user feel uncomfortable.

[Brief description of drawings]

FIG. 1 is a perspective view showing a connecting portion of a seat receiving body, a backrest support rod, and a column.

FIG. 2 is a side sectional view of the chair showing a tilting motion of the backrest.

FIG. 3 is a side sectional view of the chair showing the tilting motion of the seat.

[Explanation of symbols]

 1 ... Seat support 2 ... Backrest support 7 ... Recess 20 ... Horizontal side A ... Virtual axis (waist joint axis) 27, 28 ... Pins 9, 10, 21, 22 ... Slit 33 ... Gas spring (biasing means) )

Claims (1)

[Claims] 1. A horizontal side portion (20 ) of an L-shaped backrest support rod (2) on the rear side of a recess (7) extending in the front-rear direction provided in the widthwise central portion of the seat receiving body (1). ) with is disposed substantially forward of the backrest a upper seat (13) (18)
In a mode in which the backrest (18) is tilted in the front-rear direction with the virtual axis (A) set at the waist joint axis position as the central axis, the horizontal side portion (20) with respect to the seat receiving body (1)
(27) ( 28 ) and arcuate slits (9) (10) (21) (22)
Are connected via the front and rear slide mechanisms, and
A chair with a backrest, comprising a biasing means (33) for biasing the backrest (18) in a standing direction.