JPH0236535Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a chair.

PRIOR TECHNOLOGIES AND THEIR PROBLEMS There are various types of chairs, such as those for office use, study use, comfort use, various types of work, and body correction use. Since the seat is folded forward at the waist, sitting for long periods of time is likely to cause problems such as fatigue.
The best way to release your body from this state is to arch your body backwards. Some conventional chairs have a backrest that can be tilted backwards with a spring force, but this only allows the sitter to reduce the amount of flexion between the upper and lower body of the sitter, making it difficult to maintain the sitting posture. I was unable to bend my body in the opposite direction, or in a similar state, and was unable to fully release my body.

This invention solves these conventional problems and
To provide a chair in which a seater can easily take a posture of bending his/her body backward by his or her own strength.

Means for Solving the Problems The object of the present invention is to provide a seat portion, a backrest portion,
The front frame includes a front frame that supports the seat, and a rear frame that supports the backrest, and the front frame includes a seat support that extends in the front-back direction of the chair along the seat, and and a front leg that extends substantially directly below the front end of the seat. and is attached to the front frame at a rear end portion of the seat support portion so as to be rotatable around an axis in the width direction of the chair, and the backrest portion is supported by the backrest support portion. and a backrest plate rotatably supported by the support shaft, and the rear frame is located at a position where the lower end of the rear leg is approximately directly below the backrest support shaft. This is achieved by a reclining chair characterized in that the lower ends of the rear legs can be fixed to the front frame at the positions where the lower ends of the rear legs are rotated so as to move rearward from the positions.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

The reclining chair shown in FIG. 1 includes a seat portion 1, a backrest portion 2, a front frame 3, a rear frame 4, and a fixing portion 5. The seat 1 may be made of any material or structure, such as hard, soft, spring-supported, etc., as long as it has enough strength to support the seated person. The front frame 3 and the rear frame 4 are each composed of a pair of metal pipes on the left and right sides of the chair that are connected to each other by horizontal members. The front frame 3 includes a seat support part 30 that extends in the chair front-rear direction along the seat part 1 and supports the seat part 1, and a front leg 31 that extends substantially directly below from the front end of the seat support part 30. The rear frame 4 is rotatably attached to the rear end of the seat support 30 by a shaft 40 extending in the width direction of the chair, and includes a backrest support that extends upward from near the shaft 40 and supports the backrest 2. 41, and a rear leg 42 extending downward from near the shaft 40.
It is equipped with The backrest portion 2 has a support shaft 2 supported between the upper end portions of a pair of backrest support portions 41.
0, and a backrest plate 21 rotatably supported by the support shaft 20. A pair of fixing bars 5 are provided on the left and right sides of the chair, one end of which is rotatably supported by the seat support portion 30, the other end of which is provided with a fixing bar 50 having a through hole 51, and two fixing bars located above and below the rear legs 42. The fixing bar is provided with pins 52 and 53 that support the fixing bar at each position by passing through the through hole 51. The length of the fixing bar 50, the mounting positions of the pins 52, 53, etc. are determined as follows. That is, when the fixed bar 50 is supported by the lower pin 53, the rear frame 4 is positioned so that the lower end of the rear leg 42 is substantially directly below the backrest support shaft 20. Further, when the fixed bar 50 is supported by the upper pin 52, the rear frame 4 rotates around the shaft 40 from the above position, and is positioned at a position where the lower end of the rear leg 42 is moved rearward from the backrest support shaft 20. be done. The latter position is located at the rear leg 4, as described below.
It is desirable that the lower end of the support shaft 20 is set 5 cm to 20 cm behind the support shaft 20.

This chair can be used as follows. When taking a normal sitting position, use the fixed bar 50.
is supported by the pin 53 on the lower side of the rear leg 42, and the lower end of the rear leg 42 is located approximately directly below the backrest support shaft 20, making it look like a normal chair. The area is approximately the same as a regular chair. When the fixed bar 50 is supported by the upper pin 52, the chair functions as follows. The rear frame 4 rotates around the shaft 40 from the above-mentioned position, and the lower end of the rear leg 42 moves to a position rearward of the backrest support shaft 20, as shown in FIG. At the same time, the backrest portion 2 is moving forward.
Therefore, even if the seater tilts his or her upper body backward as shown in FIG. 2 and the center of gravity moves rearward, the support of the lower ends of the rear legs 42 at the rear of the chair prevents the chair from tipping over. Furthermore, as the backrest portion 2 moves forward, the seater leans back from a position forward of the normal seating position on the seat portion 1, so that the chair falls more reliably prevented. Therefore, compared to simply providing the lower end of the rear legs at the rear, the installation area of the chair can be made smaller and a fall prevention effect can be obtained. From the viewpoint of preventing the chair from falling over and preventing an increase in the installation area of the chair, the rear legs 4
It is desirable that the lower end of the seat 2 be located 5 cm to 20 cm behind the backrest support shaft 20 when moved to the rear position. In addition, the rear part of the seat part 1 descends and tilts as the rear legs 4 rotate as described above.
The seater can more easily lean back.
FIG. 3 shows a state in which the seater's hips are lifted off the seat 1 and arched significantly. Even with such a large backward tilt, the chair is reliably prevented from falling. In this embodiment, the pins 52 and 53 are provided at two locations on the rear legs 42, but three or more pins may be provided to position the rear legs 42 according to the degree of backward tilt desired by the seater. It can be made to be louder. In order to prevent the backrest plate 21 from rotating during normal use, a pin is passed through the rear frame 4 in the direction of the dashed line A and passed through the backrest plate 21 to fix the backrest plate 21, as shown in FIG. Good too.

FIG. 4 shows another embodiment of the invention.

The front frame 3A of this tilt-down chair has a seat support part 30 along the seat similar to the previous example, but the front legs 3A
1A extends diagonally from the rear end of the seat support part 30 and reaches approximately right below the front end of the seat support part 30. Fixed part 5A
One end of the fixed bar 50A is rotatably supported by the front leg 31A, and the other end is engageable with the pins 52, 53 of the rear leg 42. The seat portion 1A is attached to the front frame 3A via a sliding portion 6, which will be described next. Other than the above, the configuration of the chair in this example is the same as in the previous example. In the figures, similar parts to those in the previous example are designated by the same numbers. As shown in FIG. 5, the sliding portion 6 includes a support 60 fixed to each seat support portion 30 and extending in the front-rear direction of the chair, and a support 60
A slider 61 fixed to the bottom surface of the seat portion 1A along
and one pair each. Each support 60 has protrusions on both sides so as to form a T-shape in cross section, and the slider 61 has a groove part so as to form a C-shape in cross section and engages with both protrusions of the support 60. With the guidance of these supports 60 and sliders 61, the seat portion 1A can slide about 10 cm in the front and back direction with respect to the front frame 3A. Therefore,
The chair of this example not only provides the effect of preventing the chair from falling in the previous example, but also provides the following effect. That is, the seat portion 1A connects to the front frame 3A via the sliding portion 6.
Since the rear frame 4 is rotated to move the lower end of the rear legs 42 rearward, and when the seater moves forward when the seater tilts back, , the seat portion 1A moves forward. Therefore, the seater can maintain a seated state deeply on the seat portion 1A, and stability of the seat can be obtained. The sliding portion as shown in this example can be applied to chairs according to the present invention in addition to the previous example.

In the above example, the fixing part is one in which the fixing bar is engaged with different pins, but in addition, there are also abutting members, fastening members, and locking members that fix the front frame and the rear frame at predetermined rotational positions. It is possible to employ various mechanisms that can achieve fixation with normal angle adjustment, such as the following.

Effects of the Invention As is clear from the above, according to the present invention, it is possible to provide a chair that has the following effects. That is, the rear frame including the backrest support part and the rear legs is rotatably attached to the front frame supporting the seat part at the rear end of the seat support part, and is rotatable around the axis in the width direction of the chair. Since the lower ends of the legs can be fixed to the front frame at a position where the lower ends of the legs are approximately directly below the backrest support shaft and at a position where the lower ends of the rear legs have been rotated so as to move rearward from this position, the rear The frame can be used as a regular chair by positioning the lower end of the rear legs almost directly below the backrest support shaft, and if necessary, the center of gravity of the sitter can be moved by moving the lower ends of the rear legs backwards from the above position. This prevents you from falling backwards due to In this case, the backrest rotates forward as the rear legs move backward, so the center of gravity of the seater acts forward accordingly.
The effect of preventing the chair from falling becomes more reliable. Therefore, compared to simply providing the lower end of the rear legs at the rear, the installation area of the chair can be made smaller and a fall prevention effect can be obtained. In addition, since the backrest plate is attached to be rotatable around the horizontal axis, the seated person can use the support provided by the backrest plate and the rotation of the backrest plate to prevent the seated person from falling backwards. By its own strength, it can assume a posture that is arched backwards.

[Brief explanation of drawings]

The figure shows an embodiment of the present invention.
2 is a side view of the example shown in FIG. 1 in one usage state; FIG. 3 is a side view showing another usage state; FIG. 4 is a side view of another example; The figure is a perspective view showing the details of the sliding part in the example of FIG. 4 in an exploded state together with other members. 1,1A... Seat part, 2... Backrest part, 3,3
A... Front frame, 4... Back frame, 5,5A
... Fixed part, 20 ... Support shaft, 21 ... Backrest plate, 30 ... Seat support section, 31, 31A ... Front leg, 40 ... Axis, 41 ... Backrest support section, 4
2... Hind legs.

Claims (1)

[Claims for Utility Model Registration] The chair includes a seat, a backrest, a front frame that supports the seat, and a rear frame that supports the backrest, and the front frame extends along the seat. a seat support portion extending in the front-rear direction;
a front leg coupled to the seat support and extending substantially directly below the front end of the seat; the rear frame includes a backrest support that supports the backrest above the seat; and a rear leg extending downward from the seat support part, and is attached to the front frame at the rear end of the seat support part so as to be rotatable around an axis in the width direction of the chair, and the backrest part a support shaft supported by the support part and extending in the horizontal direction;
and a backrest plate rotatably supported on the support shaft, and the rear frame has a position where the lower end of the rear leg is substantially directly below the backrest support shaft, and a position where the lower end of the rear leg is below the position. 1. A tilt-up chair, characterized in that the chair can be fixed to the front frame at each position in which it is rotated so as to move rearward. Claims for registration of a utility model, characterized in that the rear frame can be fixed in a rotated position such that the lower end of the rear leg moves 5 cm to 20 cm rearward from substantially directly below the backrest support shaft. The reclining chair described in paragraph 1.