KR100418735B1 - backrest mechanism for chairs - Google Patents

Abstract

The present invention relates to the driving of the backrest 21 of the chair, and when the person 20 drives the backrest 21 backward after sitting on the chair, the center of rotation of the backrest of the chair Center of rotation Since this does not match, the phenomenon that the person 20 slips with respect to the backrest 10 of the chair occurs, in order to eliminate this problem, the center of rotation of the backrest 10 Another rotation center point eccentric with A plate 5 assembled with a pin 7 rotatably around a plate 5 and a plate 6 with a backrest 10 mounted to a pin 4 assembled to be rotatable with respect to the plate 5. And the plate 6 is mounted on the pin 4, and when the backrest 10 rotates backward, the backrest 10 and the pin 4 on which the plate 6 is mounted are grooves 11 of the guide plate 3. To move), the backrest (10) Center of rotation of the backrest 10 It provides a backrest 10 driving device to prevent the sliding phenomenon by sliding toward.

Description

Backrest mechanism for chairs {backrest mechanism for chairs}

FIG. 3 shows a conventional chair, and FIG. 4 shows a coordinate diagram for explaining the problem of the conventional chair.

If the person 20 sits on a chair like the solid line of FIG. 3, the center of rotation of the person 20 is the pelvic part. Becomes the center of rotation of the chair back 21 The person 20 and the chair back 21 have different rotation center points.

When the backrest 21 of the chair rotates in the CC direction as shown by the dotted line in FIG. 3, the person 20 and the chairback 21 rotate with different rotation center points, and thus the backrest 21 of the chair. The person 20 is relatively slid.

This will be described using FIG. 4 as follows.

The backrest 21 is the initial posture From the center of rotation of the backrest 21 to raise the backrest 21 direction height of the person 20 sitting on the backrest 21 And the back 21 in the CC direction As the center of rotation In posture and the person (20) As the center of rotation When rotated in the posture, the height of the back 21 of the person 20 on the back 21 from the rotational center of the back 21 is increased. In this case, the rotational center points of the backrest 21 and the person 20 are different from each other, so that the person 20 with respect to the backrest 21 is different. As long as sliding occurs. When the backrest 21 rotates, the occurrence of sliding of the person 20 with respect to the backrest 21 becomes a problem. In particular, in the case of a medical chair, the patient needs to move again in the opposite direction in which the sliding occurs. There is.

The present invention provides a backrest driving device of a chair to prevent a person from sliding with respect to the backrest 10 by a method of additionally providing the backrest 10 and the eccentric rotation axis in order to eliminate the problems of the conventional chair described above. There is.

1 is a cross-sectional view of the assembly of the backrest drive unit according to the embodiment of the present invention

2 is a plate diagram according to the practice of the present invention

3 is a cross-sectional view showing a conventional medical chair

4 is a coordinate diagram for explaining a problem of a conventional medical chair

* Explanation of symbols for the main parts of the drawings

1: chair seat 2: pin

3: guide plate 4: pin

5: plate 6: plate

7: pin 9: plate

10: back 11: home

1 shows an embodiment of the present invention, which will be described in detail with reference to the above drawings.

Center of rotation of the backrest 10 described above Another rotation center point eccentric with A pin (5) assembled with the pin (7) so as to be rotatable with respect to the pin (7), with a pin (4) assembled with the plate (5) so as to be rotatable with respect to the plate (5). A plate 6 on which the backrest 10 is mounted is provided. In addition, the center of rotation of the backrest 10 is a pin 4 assembled to be rotatable with respect to the plate 5 described above. It is provided with the guide plate 3 which can move along the guide groove 11 which faces to the side. The pin 7 is mounted on the support 9 of the chair seat 1, and the pin 2 is mounted on the guide plate 3 so as to be relative to the support 9 of the chair seat 1. Equipped with a rotatable structure. That is, the backrest 10 is the rotation center point of the backrest 10 by the guide of the guide plate 3. With guide plate (3) on ship facing It has a structure that can rotate and slide with the rotation center point.

The above operation will be described.

The backrest 10 is in the CC direction When the rotation is driven around the center of rotation of the backrest 10 and the plate (6) is mounted on the pin 4, the sliding takes place in the groove 11 of the guide plate 3, the sliding of the backrest 10 Rotation center And eccentric The plate 5 assembled with the pin 7 so as to be rotatable with respect to the rotation center is assembled to be rotatable with the sliding pin 4.

That is, when the backrest 10 is driven to rotate in the CC direction by the above operation, the backrest 10 is rotated by the pin 4 assembled to be rotatable on the rotating plate 5 which is eccentric with the backrest 10 rotation center. Along the centerline Backrest (10) center of rotation Slide in the direction.

On the contrary, when the backrest 10 is driven to rotate in the CW direction by the above-described operation, the backrest 10 is rotated by the pin 4 assembled to be rotatable on the rotating plate 5 which is eccentric with the backrest 10 rotation center. Along the centerline Backrest (10) center of rotation Slid in the opposite direction.

2 shows a detailed view of a plate 5 according to an embodiment of the invention. The sliding amount mentioned above Varies with the length of the plate 5. The adjusting nut 5b has a structure in which the adjusting bolt 5a is assembled with the male and female adjusting bolts 5a and is assembled in a structure capable of relative rotation with respect to the adjusting rod 5c. When the adjusting nut 5b is rotated clockwise or counterclockwise, the length of the plate 5 is changed by the action of the bolt 5a and the nut 5b, and the sliding amount can be changed by the above-described method. .

When the backrest 21 is rotationally driven, the sliding of the person 20 along the backrest 21 occurs with respect to the backrest 21. In particular, in the case of a medical chair, the backrest 21 is used to treat a patient. There is a problem that the patient has to move again in the opposite direction of the sliding after driving the rotation.

The present invention can eliminate the inconvenience of the conventional chair by preventing the above-mentioned sliding does not occur.

Claims (2)

Backrest 10 in CC direction Of the guide plate 3 mounted to the pin 2 so that the pin 4 on which the backrest 10 and the plate 6 are mounted can be rotated relative to the chair seat 1 when driven by the rotation center. Sliding takes place in the groove 11, the sliding is the center of rotation of the backrest 10 Eccentric axis The pin 7 attached to the chair seat 1 and the plate 5 assembled to the pin 7 so as to be rotatable with respect to the sliding pin 4 are rotatably assembled, That is, when the backrest 10 is driven to rotate in the CC direction by the above operation, the backrest 10 is rotated by the pin 4 assembled to be rotatable on the rotating plate 5 which is eccentric with the backrest 10 rotation center. Along the centerline Backrest (10) center of rotation Backrest drive device of the chair, characterized in that sliding in the direction. The amount of sliding even when the backrest 10 is driven to rotate at the same angle by adjusting the length of the plate (5). The backrest driving device of the chair, characterized in that to be different.