JPH0647314Y2 - Chair - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application This device not only functions as a chair, in particular, a chair with a backrest, but also has a comfortable working position in which a part of the weight is absorbed by abutting the knee part on the knee rest. Relates to a chair that also has the function of a so-called balance chair that can be used for sitting.

2. Description of the Related Art When a person sits down on a normal chair and works on a desk, the person takes a working position in which the upper body is tilted forward by bending the lower part of the spinal column. For this reason, the posture deteriorates, and most of the weight is loaded on the seat plate. Therefore, when a working posture is continuously maintained for a long period of time, the buttocks and the waist are painful and fatigue increases.

Therefore, conventionally, in the state where the seat plate is slightly tilted forward, a knee support plate that receives the knee part of the seated person from the front is provided,
In the sitting position, the weight can be distributed to the seat and the knee rest so that it can be supported, and it is possible to take a comfortable forward leaning position without bending the spine. Chairs have been attracting attention for office use and learning. Many recent examples of such knee-supporting chairs can be found in, for example, Japanese Patent Publication No. 61-11605, Japanese Utility Model Publication No. 60-154051, and Japanese Patent Publication No. 61-191310.

Problems to be Solved by the Invention The above-mentioned knee-support type so-called balance chair has beneficial effects for reducing fatigue, maintaining a normal posture, etc. in accordance with ergonomics, in applications where only the working posture is continuously maintained. Play. However, the worker does not always take the working posture, and sometimes takes the same posture as when sitting on a normal chair because of resting or working with the upper body straight up. May want.

However, in the case of the above-mentioned conventional knee-supporting chair, it is not suitable to take such a sitting posture in which the upper body is straightly raised, and it is necessary to adjust the seat plate angle horizontally. Even if you take such a posture, it will hinder the knee rest, and it will be a big obstacle to take a comfortable sitting posture.

For this reason, it is necessary to use a knee-supporting chair during continuous work, and to separately prepare a conventional ordinary chair with a backrest when sitting in a normal sitting posture.

However, arranging two different types of chairs for one desk is not preferable in terms of space and economy, and it is practically difficult to deal with such a situation.

In view of the above problems, the present invention can be used as a normal chair with a backrest in the normal state, and if necessary, it can be used by converting it into a knee-supporting chair. The conversion can be performed within a range where the leg, the seat plate and the back plate are all provided in a single model, and it is possible to manufacture at a relatively low cost as it does not require additional equipment for accessories. In addition, the chair and the backrest in the conversion position are firmly fixed and excellent in stability and durability, and the conversion can be performed by a simple operation. In addition, the knee receiving position can be adjusted. It is an object of the present invention to provide a multifunctional chair that is truly suitable for practical use, which can be easily performed, and whose knee receiving position adjusting mechanism can be realized with a simple configuration.

Means for Solving the ProblemsThe present invention, while making the seat plate tiltable, can be used by converting the backrest plate into a knee rest so that it can be used as a normal chair with a backrest when sitting forward. , It is designed so that it can be used as a knee-supporting chair when sitting backwards.

That is, the invention is such that, on the upper end of the leg, the seat plate is provided, via the seat receiving frame, between a substantially horizontal normal position suitable for a normal sitting posture and a rearward tilt position in which the rear part is largely inclined downward. The angle can be adjusted variably stepwise or steplessly, while the backrest plate is attached to the rising part and the lower horizontal frame part is formed in a bifurcated shape with a pair of left and right levers in a side view. The back frame is provided, and the tip portions of both lateral rods of the back frame are pivotally attached to the seat receiving frame, so that the backrest plate can be freely switched between the standing position and the knee receiving position, Further, at the lower part of the seat receiving frame, a pair of left and right side walls are arranged so as to face each other at a predetermined interval, and a receiving frame member provided with elongated holes in a side view is attached to corresponding positions of the both side walls, and the back frame is provided. At the middle of the lengthwise direction of both side rods, both ends of the substantially U-shaped support rod Is pivotally attached, and the horizontal rod portion of the support rod is inserted through the long hole of the receiving frame member, and the horizontal rod portion is arranged at the lower end of the vertical hole portion of the long hole, whereby the backrest plate is formed. The backrest plate is held at the knee receiving position by arranging the horizontal rod portion at the front end portion of the horizontal hole portion of the elongated hole while being held at the standing position, and further, the front end of both side walls of the receiving frame member. A screw block having a penetrating screw hole oriented in the direction in which the lateral hole portion of the elongated hole extends is fixedly arranged between the parts, and an adjusting screw is moved forward and backward from the front end surface of the screw hole of the block. A gist is a chair characterized in that the chair is screwed so that the tip end of the adjusting screw is brought into contact with the front surface of the lateral rod of the supporting rod.

By adjusting the seat plate to a substantially horizontal normal position, and by arranging the horizontal rod portion of the supporting rod at the lower end of the vertical hole portion of the long hole of the frame receiving member and holding the backrest plate in the standing position, The chair functions as a normal chair with a backrest.

On the other hand, depending on the degree of preference, adjust the seat plate to the rearward tilted position and move the backrest plate to the knee receiving position while changing the lateral rod part of the support rod to the lateral hole part of the long hole. When placed at the front end, the front and rear of the entire chair is reversed, and when the person sits backwards with respect to the seat plate, the backrest plate is located in front of the seated person's knee, and the knee comes into contact with the backrest plate. It can be used as a knee-support type chair, which allocates part of its weight.

Furthermore, when the backrest plate is used as a knee rest, if it is desired to change the knee rest position according to the user's body shape, posture, etc., operate the adjusting screw to move the support rod in the lateral hole of the long hole. By changing the holding position of the lateral rod, a proper knee receiving position can be obtained.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, (1) is a height-adjustable pipe pedestal having radial leg seats (2) at its lower end, (3) is a seat plate supported at its upper end, and (4) is a backrest plate. .

A seat receiving frame (5) made of square pipe is welded and fixed to the upper end of the pedestal (1) in a state of being inclined obliquely upward toward the front via a mounting auxiliary plate (6). Then, a mounting frame (8) fixed to the lower surface of the seat plate (3) is attached to a support shaft (7) horizontally penetrating the front end portion of the seat plate (3) at a substantially central position in the front-rear direction. The seat plate (3) can be tilted in the front-rear direction about the support shaft (7).

On the lower surface of the rear portion of the seat plate (3), a support rod (11) for fixing the seat plate is suspended via a mounting member (10) so as to be swingable in the front-rear direction. The support rod (11) is vertically slidably inserted into a central portion of a female screw cylinder (12) horizontally and rotatably inserted through the rear portion of the seat receiving frame (5), so that the seat receiving frame (11) 5) By tightening the fixing screw (13) with the handle screwed into the female screw cylinder (12) from the outer surface on one side, the supporting rod (11) is fixed at its tip, and by extension the seat plate (3). Can be fixed at a desired angle. Therefore, the seat plate (3) has a substantially horizontal fourth position suitable for a normal sitting posture.
Between the normal position as shown in the figure and the maximum rearward tilted position as shown in FIG. ing. Of course, the variable angle fixing device for the seat plate (3) may be one that can change the angle stepwise.

The backrest plate (4) is appropriately fixed to the front surface side of the rising portion (9b) of the inverted U-shaped pipe back frame (9) formed in a substantially L shape when viewed from the side surface with screws or the like. And back frame (9)
A pair of left and right side rods (9c) (9c) of the horizontal frame (9a) at the bottom of the
The tip end of the support shaft (7) on the lower surface side of the seat plate (3).
Therefore, the back frame (9) is rotatable around the support shaft (7), and if necessary, the back frame (9) is laid down on the back of the chair. It is supposed to be able to move.

Thus, the back frame (9) has the back plate (4) and the seat plate (3).
When the person sits backwards on the seat plate (3) by making a large downward swing from the standing position where the person's back is received in a normal sitting posture raised to the rear position of the person, It is possible to pivotally switch between the knee portion and the knee receiving position as shown in FIG. 5, which is capable of receiving the knee portion obliquely from below, and can be fixed at both the above positions.

This back frame conversion fixing device has a substantially U-shaped configuration as shown in FIG. 1 in which both ends are pivotally attached to the middle parts of the left and right lower horizontal rod parts (9c) of the back frame (9) by pins (15). Has a supporting rod (14) and a receiving frame member (17) having a substantially hat-shaped cross section, which is fixed to the lower surface of the seat receiving frame (5) by welding, and both side walls (17a) of the receiving frame member (17).
A lateral rod portion of the support rod (14) is loosely inserted into an elongated hole (16) formed in a side view and formed in (17a). Then, the horizontal rod portion of the support rod (14) is positioned at the lower end of the vertical hole portion (16b) of the long hole (16) to hold it in the standing position of the backrest plate (4) as shown in FIG. On the other hand, the backrest plate (4) is located at the front end of the lateral hole (16a) of the elongated hole (16) as shown in FIG.
Can be held in the knee receiving position.

In the latter knee receiving position, the long hole is provided between the front end portions of the side walls (17a) (17a) of the receiving frame member (17) so that the angle and height of the backrest plate (4) can be finely adjusted. A rectangular screw block (22) having a penetrating screw hole (22a) oriented in the direction of extension of the lateral hole portion (16a) of (16) is arranged in a fixed state and the block (22) Screw hole (22
An adjusting screw (18) with a handle is screwed into a) from its front end surface so that the tip end of the adjusting screw (18) is brought into contact with the front surface of the lateral rod portion (14a) of the supporting rod (14). It is designed to be. Thereby, the holding position of the lateral rod portion (14a) of the supporting rod (14) in the lateral hole portion (16a) can be changed back and forth, and the knee receiving position can be adjusted by the backrest plate (4). There is.

Further, in order to hold the backrest plate (4) in a safe locked state in both of the positions, that is, the normal position and the knee receiving position, a lock plate (19) is provided on one side of the receiving frame member (17). There is. The lock plate (19) is adapted to receive the lateral rod portion (14a) of the support rod (14) in the forked portion (19a) of the tip and to be fixed by the backrest fixing screw (20). , And by fixing it, the long hole (1
6) It restrains the free movement within.

When the chair is used normally, the seat plate (3) is placed in a substantially horizontal normal position as shown in FIG. 1, and the backrest plate (4) is set to the standing position, so that the chair is shown in FIG. As shown, it is used just like an office chair with a backrest.

When using it as a knee-support type balance chair to continue working or study on a desk for a long time, convert to the above-mentioned knee-support type by the following operations. That is, first, the seat plate fixing screw (13) is loosened to convert the seat plate (3) into a large rearward tilted state at a desired angle and then fixed again at the rearward tilted position. On the other hand, loosen the backrest fixing screw (20) and move the support rod (14).
Move the side rod (14a) of the hole to the side hole (16a) of the long hole (16), finely adjust its position with the adjusting screw (18), and then tighten the lock plate (19) with the fixing screw (20). By doing so, the supporting rod (14) is fixed. As a result, the back frame (9) interlocking with the support rod (14) is largely tilted rearward and pivoted, and fixed at the knee receiving position as shown in FIG. Accordingly, in this state, the user sits backward on the seat plate (3) as shown in FIG. 3 and tends to slide forward in the seated posture. ) To support a portion of his weight and keep his back straight and in a comfortable working position.

Effect of the Invention According to the above, the present invention is a chair having a shape of an ordinary chair with a backrest, and can be arbitrarily converted into a knee-support type chair by adjusting the angle of the seat plate and the backrest plate and changing the position. . Therefore, a single chair can be used for both purposes, which is particularly convenient in the fields of learning chairs, office chairs, and the like.

Moreover, the chair according to the present invention can be converted to both of the above-mentioned applications within the range of having one leg, a seat plate, and a back plate, which are the main constituent parts of the chair. There is no need to newly install a knee support plate for conversion to the receiving type or remove it for the reverse conversion, and it is relatively inexpensive to manufacture with the minimum number of component parts. It is convenient and easy to handle.

And as a position fixing structure of the backrest at the conversion position,
A receiving frame member having a long hole in a side view is attached to the lower part of the seat receiving frame, and both ends of a substantially U-shaped supporting rod are pivoted at the middle portions in the length direction of both lateral rods of the back frame. The horizontal rod portion of the support rod is inserted into the elongated hole of the receiving frame member. Therefore, a link mechanism with a relatively long span can be configured, and the backrest can be fixed firmly at the conversion position, and the stability at the conversion position and the durability as a multifunctional chair are excellent. You can do things.

In addition, by switching whether the horizontal rod portion is arranged at the lower end portion of the vertical hole portion of the long hole or at the front end portion of the horizontal hole portion, the standing position and the knee receiving position are switched. As a result, the switching operation between the two positions can be performed quickly and easily.

In addition, a screw block having a penetrating screw hole oriented in the extending direction of the lateral hole portion of the elongated hole is arranged in a fixed state between the front end portions of both side walls of the receiving frame member, and the screw hole of the block is provided. The adjustment screw is screwed from the front end surface of the adjustment screw so that the adjustment screw can move forward and backward, and the tip end of the adjustment screw is brought into contact with the front surface of the lateral rod of the support rod, so that the backrest can be adjusted at the knee receiving position. In addition to being easy to carry out, the configuration of stepless adjustment allows the optimum knee receiving position to be set, and the configuration can be simplified by cooperation with the receiving frame member.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a perspective view of a main part, Fig. 2 is a side view showing a state in which the chair is used as a normal chair with a backrest, and Fig. 3 is a knee support type. FIG. 4 is a side view showing a state when used as a chair, FIG. 4 is a side view of a main part in a used state of FIG. 2, FIG. 5 is a side view of a main part in a used state of FIG. 3, and FIG. FIG. 4 is a central longitudinal sectional view of FIG. 4, and FIG. 7 is a sectional view taken along line VII-VII of FIG. (1) …… Pedestal, (3) …… Seat plate, (4) …… Backrest plate, (5) …… Seat receiving frame, (7) …… Spindle, (9) …… Back frame, (9a ) …… Lower horizontal frame, (9b) …… Rise,
(9c) …… Horizontal rod, (14) …… Support rod, (14a) …… Horizontal rod, (16) …… Long hole, (16a) …… Horizontal hole, (16b) ……
Vertical hole, (17) …… Frame member, (17a) …… Side wall, (1
8) …… Adjusting screw, (22) …… Screw block, (22a)…
… Screw holes.

Claims (1)

[Scope of utility model registration request] 1. A seat plate (3) is provided on the upper end of the leg body (1) through a seat receiving frame (5) in a substantially horizontal normal position suitable for a normal sitting posture, and a rear part is greatly downward. The angle between the tilted back and tilted positions can be adjusted in a stepwise or stepless manner, while the backrest plate (4) is attached to the rising part (9b) and the lower horizontal frame part (9a) is left and right. A pair of horizontal rods (9c) (9c)
Is provided with a bifurcated L-shaped back frame (9) in side view, and the tip ends of both lateral rods (9c) (9c) of the back frame (9) are attached to the seat receiving frame (5). By being pivotally attached, the backrest plate (4) can be freely switched between an upright position and a knee receiving position, and a pair of left and right side walls (17) is provided at a lower portion of the seat receiving frame (5).
a) (17a) are arranged so as to face each other at a predetermined interval, and a receiving frame member (17) provided with a side view-like elongated hole (16) is attached to corresponding positions of both side walls (17a) (17a). At the same time, both end portions of a substantially U-shaped supporting rod (14) are pivotally attached to the longitudinal middle portions of both lateral rod portions (9c) (9c) of the back frame (9), and the supporting rods (9). The horizontal rod portion (14a) of (14) is inserted and arranged in the elongated hole (16) of the receiving frame member (17) to form the horizontal rod portion (14).
By placing a) at the lower end of the vertical hole portion (16b) of the long hole (16), the backrest plate (4) is held in the standing position, while the horizontal rod portion (14a) is formed into the long hole (16). The backrest plate (4) is held at the knee receiving position by arranging the backrest plate (4a) at the front end of the lateral hole (16a) of the side frame (17a) (17a) of the receiving frame member (17). A screw block (22) having a penetrating screw hole (22a) oriented in the extending direction of the lateral hole portion (16a) of the elongated hole (16) is fixedly arranged between the front end portions, and Insert the adjusting screw (1) into the screw hole (22a) of the block (22) from its front end face.
A chair characterized in that 8) is screwed so as to be able to move forward and backward, and the tip end portion of the adjusting screw (18) is brought into contact with the front surface of the lateral rod portion (14a) of the supporting rod (14).