KR100324342B1 - Tiltable backrest chair - Google Patents

Abstract

In a chair having a backrest 4 which is inclined rearward by the action of a spring, the spring device has a center connected to the pedestal structure 2 of the chair and two side arms 4a supporting the backrest 4 at both ends. It is connected.

Description

Tiltable backrest chair

The present invention is a backrest having a pedestal structure, a seat supported by the pedestal, a support structure rotatably mounted to the pedestal in a horizontal axis, which can move between the vertical position and the inclined rearward position, and deflects the backrest in the vertical position. Relates to a chair in the form of a spring device.

In recent years, research has been actively conducted to provide a chair that is used in a public place such as a movie theater, a theater, an auditorium, a conference room, and the like to provide maximum comfort and an ergonomically appropriate sitting position. Naturally, this type of chair structure needs to be simple and inexpensive.

Thus, the designer has tried to find a compromise solution to the aforementioned conflicting needs, but has not been able to find a completely satisfactory solution.

Chairs provided in public places need to be provided similarly to the backrest chairs which can be inclined elastically in the vertical position of the office chair.

Accordingly, an object of the present invention is to provide a chair of the type that can be used in particular in the field of chairs that can be used in public places, and to solve the above problems with the advantage that it can be used in other fields, such as home or office To provide.

In order to achieve the above object, the present invention provides a backrest having a pedestal structure, a seat supported by the pedestal structure, and a backrest having a support structure rotatably mounted to the pedestal structure on a horizontal axis, so that the position is relatively inclined between the vertical position and the rearward tilted position. Provided is a chair that is movable and configured with a spring device that biases the backrest to a vertical position.

The spring device consists of a leaf spring arranged along the connecting axis of the back support structure, the center of which is connected to the pedestal structure, and the end thereof is connected to the back support structure.

Half of the leaf spring is connected to the pedestal structure at the center of the leaf spring and serves as a torsion bar connected to the backrest at the end of the leaf spring. Thus, this arrangement provides the effect of two torsion bars connected to both sides of the backrest, while the structure is relatively simple, inexpensive, and can be easily and quickly installed.

1 is a side view of a first embodiment according to the present invention.

2 is an enlarged view of the chair of FIG. 1 and shows a partial bottom view.

FIG. 2A is a cross-sectional view taken along the line II-II of FIG.

3 is an enlarged cross-sectional view along the line III-III of FIG.

4 is a partial cross-sectional view along the IV-IV line of FIG.

5 shows a second embodiment of a chair according to the invention.

6 and 7 show a front view and a plan view of the chair of FIG.

8 shows the chair of FIG. 5 in different operating conditions.

9 is an enlarged view of a section along the line IX-IX of FIG.

10 and 11 are cross-sectional views taken along X-X and XI-XI of FIG.

12 is a cross-sectional view along the line XII-XII in FIG.

13 and 14 are cross-sectional views taken along XIII-XIII and XIV-XIV in FIG. 10.

15 to 17 are each side, front, and top view showing two characters in the form of FIG. 5 superimposed.

18 and 19 are side and plan views of two chairs arranged side by side.

* Sign Description

1 ‥‥ Chair 2 ‥‥ Stand

3 ‥‥ Sheet 4 ‥‥ Backrest

5,6 ‥‥ Bent tube element 7 ‥ ‥ front leg

8 ‥ ‥ 12 leg ‥ bush

13 ‥‥ Plate metal 14 ‥ ‥ cylinder pin

15 ‥‥ Bushing 16 ‥‥

17 ‥ ‥ slot 18 ‥ ‥ axis

19 ‥ ‥ 20 thread ‥ plate spring

22 ‥‥ Radial outward deformation 30 30

31 ‥‥ Side foot 33 ‥‥ Intersection

34 ‥‥ Accessories

In an embodiment of the invention, the pedestal structure comprises a tubular end having a leaf spring arranged in the tube and the tube member is at least in the inner stop in order to limit the rotation of the leaf spring.

The back support structure includes two side arms consisting of two coaxial pins rotatably mounted in both side ends of the tube, and pins relative to the tube between the two end positions corresponding to the vertical and rear tilted positions of the backrest. Each pin and tube end is provided with a stop connected to each other in order to limit the movement of the tilted angle. This arrangement results in a torsional load when half of the leaf spring is held in the vertical position when the backrest is in the vertical position.

Further, in an embodiment, the tube consists of a sheet metal tube having two opposite areas of the center that are inwardly deformed with respect to the central part which contacts the leaf spring when the backrest is tilted backwards. In addition, the stopper interacts between the tube ends, and each pin that is rotatably mounted therein has a transverse member at the tube end that is moved by the pin and has each end coupled in a slot formed in the tube wall. do.

Naturally, the mechanisms described above can be applied to many different types of chairs.

Embodiments and descriptions are detailed below in conjunction with the accompanying drawings and do not limit the invention thereto.

Referring to Figures 1 and 2, the chair 1 is composed of a pedestal for supporting the seat 3 and the backrest (4). The pedestal structure 2 consists of two curved tubular elements 5, 6 welded to each other, two forelimbs 7 and two hind legs 8. Each of the two tubular elements 5, 6 is generally U-shaped. The element 5 has a central portion 9 in the U-shaped horizontal plane to which the two wings which become the front leg 7 of the chair and the seat are fixed.

The U-shaped element 6 has two wings that become the hind legs 8 and a central straight portion 10 which is welded to the element 5 at the end 11, as can be seen in FIG. 2. The central straight portion 10 supports the two end bushes 12 of the cantilever type inwardly welded to the tube ends of the sheet metal 13, so that the pedestal structure of the chair is firmly connected.

The backrest 4 of the chair consists of two side arms 4a, and at its end a cylindrical pin 14 is mounted at each end of the tube 13 so that the plastic bush 15 has a low frictional force. . The pin 14 is interposed by a cross section 16 having two ends connected in a slot 17 formed in the bush 12. The inclined movement of the backrest 4 around the axis 18 of the tube 13 is limited at two end positions corresponding between the relatively vertical position and the tilted back position, which is indicated by the dashed line and straight line in FIG. It becomes a movement. In Fig. 3, reference numeral 99 is connected to each arm 4a of the backrest with a screw for fixing the cross section 16.

The spring deflection of the backrest 4 to the vertical position is obtained by means of a springing device consisting of a leaf spring 20 arranged in the tube end 13, which is an axially formed slot 21 in the pin 14 at the end. ) Has an end housed therein. The center of the plate metal tube 13 has a portion facing each other with radially deformed radially opposite sides that contact the center of the plate when the backrest 4 is tilted backwards, as shown in FIG. 2A. The arrangement of each cross section 16 in the peripheral slot 17 is adapted to receive a load that can hold the backrest 4 in the raised position.

When the seated person leans against the back 4, the force pushing the back back by the action of the leaf spring 20 is shown. Such leaf springs are each connected to two side arms 4a serving as a pair of torsion bars connected to the pedestal structure at the center of the leaf springs and supporting the backrest 4.

As will be evident from the foregoing description, the chair is a very simple structure that can be easily and quickly made at low cost, while at the same time providing very good comfort and ergonomic sitting position.

Figures 5-14 show a chair of another embodiment of the invention, in which the parts corresponding to the chairs of Figures 1-4 refer to the same reference numerals. In the case of this embodiment, the pedestal structure of the chair is inverted T-shaped and consists of two side uprights 31 and a foot 31 at the lower end and the upper end is connected to the intersection 33. As can be seen in Figures 9 and 11, the upright portion 30 and the intersection portion 33 can be formed from a sheet metal tube that is a flat cross section of an ellipse. The intersection 3 has two appendages 34 protruding in a cantilever fashion at two sites adjacent the intersection end supporting the bush 12 welded to each end of the tube 13. The arrangement of the side arms 4a supporting the backrest 4, the leaf springs 20 in the tubes 13 and the pins 14 in the arms 4a rotatably mounted in the tube ends are shown in FIGS. 1-4. Similar to that described.

In the embodiment in FIGS. 5-19 the structure of the seat 3 is rotatably mounted in the middle of the tubular cross section 13 and is normally used (Fig. 5) adjacent to chairs of the same type in public or conference rooms. It can move between vertically raised positions (Figure 8) to create passages for humans to easily pass between rows of arrays. The operation of the chair is similar to that described in the chair of Figures 1-4.

In the accompanying drawings 15-19, the same type of chairs are overlapped or arranged side by side in an elevated position in order to occupy the minimum space.

In the foregoing description, it is clear that the method of the present invention can be applied equally to various types of chairs, and in particular, to produce a chair that is very simple, low in cost and very comfortable.

Claims (7)

In a chair with a tiltable back, Pedestal structure (2), A backrest 4 having a support structure 4a movable between a vertical position and a tilted back position and rotatably mounted on the pedestal structure 2 about a horizontal horizontal axis 18, and the pedestal structure 2 A sheet 3 supported by; And A spring device 20 for applying a force to the backrest 4 for deflecting in the vertical position direction, The spring device 20 comprises a leaf spring having a central portion arranged along the axis 18 of the back support structure 4a and connected to the pedestal structure, the distal end of which is connected to the back support structure 4a. Tiltable backrest chair, characterized in that 2. The pedestal structure (2) according to claim 1, wherein the pedestal structure (2) comprises a tube (13) member having a leaf spring arranged inside the tube, the tube (13) having a leaf spring (20) to limit the rotation of the leaf spring. Slant backrest, characterized in that it has a central portion with an inner stop 22 that is connected with. 3. The back support structure (4a) according to claim 2 is composed of two coaxial pins (14) rotatably mounted in both ends of the tube, and at the ends of each pin (14) and the tube (13), There are stops 16 and 17 connected to each other to limit the tilting movement of the pins with respect to the tube 13 at corresponding opposite end positions between the tilted back positions, such an arrangement being provided when the backrest is in the vertical position. A tiltable backrest chair, characterized in that a portion of the spring 20 is subjected to a torsional load to maintain the backrest in a vertical position. 4. The tiltable backrest chair according to claim 3, characterized in that the stop (22) of the tube (13) consists of a portion (22) deformed radially inwardly from the wall of the tube. 5. The tiltable backrest chair according to claim 4, characterized in that the tubes (13) have two radially deformed portions (22) facing each other in diameter. 4. A stop device according to claim 3, wherein the stop device for limiting the rotation of the fins 14 with respect to the tube 13 consists of a transverse section 16 mounted on each fin 14, and the peripheral slots formed in the tube 13 ( 17) A tiltable back chair characterized in that it is configured to be connected within. 7. The tiltable backrest chair according to claim 6, wherein each pin (14) has an axial slot (21) running at an end that receives an end of the leaf spring (20).