UNIT COMPONENT FOR A CHAIR BACKREST

Abstract

The present invention relates to a unit component for a chair backrest. The component has a basic body. The basic body has a through hole, a supporting portion, and at least two connecting arms. The through hole is formed on the basic body. The supporting portion is mounted over the through hole. The at least two connecting arms are mounted at corners of the through hole and are connected with the supporting portion.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a unit component for a chair backrest, especially a unit component mounted on the chair backrest for supporting a human's back.

2. Description of the Prior Arts

For better sitting comfort, manufacturers have done researches and developed a backrest and a cushion of a chair by using various materials or designing different structures to provide comfortable chairs.

A conventional backrest of a chair is used for supporting a human's back to provide a better support to the seated person, and the conventional backrest is made of elastic materials such as fabrics or leathers and is designed in a curve shape according to ergonomics. As such, a user can relax his back when sitting on the chair to lean against the conventional backrest.

However, the conventional backrest is made with a fixed curvature upon manufacturing. So consumers only can choose a suitable chair from the standardized chairs according to their statures and body shapes. However, the supporting effect of the backrest of the purchased chair varies from user to user due to their different statures and body shapes. In addition, the conventional backrest is fixed in curvature, and for the best supporting effect, the user has to lean their back entirely on the conventional backrest when sitting on the chair. If the body of the user is oblique relative to the chair, the users back can't abut entirely on the conventional backrest, and the supporting effect of the conventional backrest is not fully applied on the user's back.

Furthermore, the different portions on the user's back require different supporting forces. Yet the conventional backrest made of fabrics or leathers has no obvious variations of supporting forces for different portions of the user's back, such that the user's back cannot be fully relaxed by leaning on the conventional backrest.

To overcome the shortcomings, the present invention provides a unit component for a chair backrest to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide a unit component for a chair backrest that can be used for supporting a human's back.

The unit component has a basic body, a through hole, a supporting portion, and at least two connecting arms. The through hole is formed through the basic body. The at least two connecting arms are mounted on and protrude forwardly from the basic body respectively at corners of the through hole. The supporting portion is connected to the connecting arms to extend out of the basic body.

Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a chair that comprises unit components for a chair backrest in accordance with the present invention;

FIG. 2 is a top view of the unit components for a chair backrest in FIG. 1;

FIG. 3 is a top view of a first embodiment of the unit components mounted at a specific area of a chair backrest;

FIG. 4 is a perspective view of the unit components for a chair backrest in FIG. 3;

FIG. 5 is a cross sectional view of the unit components for a chair backrest along line 5-5 in FIG. 3;

FIG. 6 is a top view of the unit components, showing both a second embodiment and a third embodiment mounted in combination on a chair backrest; and

FIG. 7 is a perspective view of the unit components for a chair backrest in FIG. 6;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference to FIGS. 1 to 4, a first embodiment of a unit component 10 for a chair backrest 40 in accordance with the present invention has a basic body 11, a through hole 12, four connecting arms 14, and a supporting portion 13. The basic body 11 is a square plate and has a center, a front side and a rear side. The through hole 12 may be rectangular, circular, or in other shapes, is formed through the front side and the rear side of the basic body 11 at the center of the basic body 11, and has four corners. With further reference to FIGS. 4 and 5, the connecting arms 14 are mounted on and protrude forwardly from the basic body 11 respectively at the corners of the through hole 12, and each one of the connecting arms 14 has a free end extending out of the front side of the basic body 11.

The supporting portion 13 may be circular, rectangular, or in other shapes, and is connected to the free ends of the connecting arms 14 to extend out of the basic body 11. In addition, multiple unit components 10 of the first embodiment of the present invention are connected to each other to form a specific area of the chair backrest 40. When the unit components 10 are connected to each other, the basic bodies 11 are formed as a main supporting structure of the chair backrest 40. Then, when a user sits on a cushion 50 that is connected to the chair backrest 40, the supporting portions 13 of the unit components 10 can be used to provide a supporting effect to the user's back and the connecting arms 14 can be elastically deformed with uniform force to provide comfort to the user.

With reference to FIG. 6, a second embodiment of a unit component 20 for a chair backrest 40 in accordance with the present invention is substantially the same as the first embodiment except for the following features. The unit component 20 has a basic body 21, a through hole 22, two connecting arms 24 and a supporting portion 23. The connecting arms 24 are mounted on and protrude forwardly from the basic body 21 respectively at two of the corners of the through hole 22, and are aligned with each other in a vertical arrangement.

With reference to FIG. 7, a third embodiment of a unit component 30 for a chair backrest 40 in accordance with the present invention is substantially the same as the second embodiment except for the following features. The unit component 30 has a basic body 31, a through hole 32, two connecting arms 34 and a supporting portion 33. The connecting arms 34 are mounted on and protrude forwardly from the basic body 31 respectively at two of the corners of the through hole 32, and are aligned with each other in a horizontal arrangement.

With reference to FIGS. 1 and 2, the connecting arms 14, 24, 34 of the unit components 10, 20, 30 are formed on the basic bodies 11, 21, 31 with different arrangements of positions, and this can enable the unit components 10, 20, 30 to provide different supporting effects to the user's back. Preferably, the unit components 10 of the first embodiment in the present invention can be connected to each other to form a lower area of the chair backrest 40, and the four connecting arms 14 of each one of the unit components 10 can provide a preferred supporting effect to the user's waist. In addition, the unit components 20, 30 of the second and the third embodiments in the present invention can be connected to each other to form an upper area of the chair backrest 40. When the user's back leans on the upper area of the chair backrest 40, even if the body of the user is in an oblique posture, the supporting portions 23, 33 can still abut the user's back to provide a preferred supporting effect to the user's back.

Therefore, the chair backrest 40 that is formed by the unit components 10, 20, 30 can provide different supporting effects to the user's back by the different arrangements of positions of the connecting arms 14, 24, 34 and can provide a preferred abutting support to the user's back even when the user moves his body. Furthermore, the unit components 10, 20, 30 in the present invention can be used to form different kinds of chair backrests 40, and the user can choose a chair backrest according to the user's stature. Additionally, when users with different statures sit and lean on the chair backrest 40, the elastic deformations of the connecting arms 14, 24, 34 of the unit components 10, 20, 30 also can enable the supporting portions 13, 23, 33 to abut and support the users' backs.

Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.

Claims

1. A unit component for a chair backrest comprising:

a basic body being a square plate and having a center, a front side and a rear side;

a through hole formed through the front side and the rear side of the basic body at the center of the basic body and having multiple corners;

at least two connecting arms mounted on and protruding forwardly from the basic body respectively at one of the corners of the through hole; and

a supporting portion connected to the connecting arms to enable the supporting portion to extend out of the basic body.

2. The unit component for a chair backrest as claimed in claim 1, wherein the unit component has four connecting arms protruding forwardly from the basic body respectively at four corners of the through hole, each one of the connecting arms has a free end extending out of the front side of the basic body, and the supporting portion is connected to the free ends of the connecting arms.

3. The unit component for a chair backrest as claimed in claim 1, wherein the unit component has two connecting arms protruding forwardly from the basic body respectively at two of the corners of the through hole and aligned with each other in a vertical arrangement.

4. The unit component for a chair backrest as claimed in claim 1, wherein the unit component has two connecting arms protruding forwardly from the basic body respectively at two of the corners of the through hole and aligned with each other in a horizontal arrangement.

5. The unit component for a chair backrest as claimed in claim 1, wherein the through hole is rectangular.

6. The unit component for a chair backrest as claimed in claim 2, wherein the through hole is rectangular.

7. The unit component for a chair backrest as claimed in claim 3, wherein the through hole is rectangular.

8. The unit component for a chair backrest as claimed in claim 4, wherein the through hole is rectangular.

9. The unit component for a chair backrest as claimed in claim 1, wherein the through hole is circular.

10. The unit component for a chair backrest as claimed in claim 2, wherein the through hole is circular.

11. The unit component for a chair backrest as claimed in claim 3, wherein the through hole is circular.

12. The unit component for a chair backrest as claimed in claim 4, wherein the through hole is circular.

13. The unit component for a chair backrest as claimed in claim 1, wherein the supporting portion is circular.

14. The unit component for a chair backrest as claimed in claim 2, wherein the supporting portion is circular.

15. The unit component for a chair backrest as claimed in claim 3, wherein the supporting portion is circular.

16. The unit component for a chair backrest as claimed in claim 4, wherein the supporting portion is circular.

17. The unit component for a chair backrest as claimed in claim 1, wherein the supporting portion is rectangular.

18. The unit component for a chair backrest as claimed in claim 2, wherein the supporting portion is rectangular.

19. The unit component for a chair backrest as claimed in claim 3, wherein the supporting portion is rectangular.

20. The unit component for a chair backrest as claimed in claim 4, wherein the supporting portion is rectangular.