Patent Application
20080277542
The present invention relates to a chair backrest mounting bracket, and more particularly, to a chair backrest mounting bracket providing excellent elastic deformability and structural strength.
In most conventional chair backrest structures, a substantially flat backrest is directly fixedly connected to a rear edge of a seat or rear ends of two armrests of the chair. Alternatively, the backrest is mounted to a backrest support upward extended from the seat or the armrests. Therefore, most conventional chair backrests are fixedly or immovably relative to the seat or armrests.
Some other chair backrest structures include an elastically bendable and deformable backrest support upward extended from a rear edge of a seat, so that a chair backrest connected to a top of the backrest support is allowed to incline rearward and therefore more comfortable for leaning. It is noted, however, the chair backrest is connected to the elastically deformable backrest support via a rigid and non-deformable mounting bracket. When the rigid mounting bracket is completely closely fixed to and between the chair backrest and the backrest support, the chair back rest is allowed to bend, that is, to incline forward or rearward, only in an elastic deformation direction of the backrest support. Therefore, the rigid and non-deformable back rest mounting bracket does not allow the chair backrest connected to the elastically deformable support to be comfortable enough to meet users' requirement. On the other hand, when a clearance is left between the rigid backrest mounting bracket and the chair backrest and the backrest support to allow the chair backrest to deflect in more different directions relative to the backrest support, the backrest tends to shake and sway due to incomplete contact with the mounting bracket. Such shaking and swaying backrest would inevitably adversely affect the consumer's trust and interest in the chair.
It is therefore tried by the inventor to develop an improved chair backrest mounting bracket to eliminate the drawbacks in the prior art.
A primary object of the present invention is to provide a chair backrest mounting bracket that has good connection strength and allows a chair backrest connected to a corresponding backrest support via the mounting bracket to elastically deflect relative to the backrest support without causing shaking or incomplete contact, so that the chair backrest has increased assembling quality and upgraded competing ability in the market.
Another object of the present invention is to provide a chair backrest mounting bracket that has simple structure to effectively reduce the manufacturing cost thereof.
To achieve the above and other objects, the chair backrest mounting bracket according to the present invention includes an elastically bendable and deformable main body for disposing between a chair backrest and a backrest support; a highly rigid middle fixing seat embedded in a middle section of the main body and having a centered middle mounting hole for a middle fastening element to extend therethrough into a threaded hole correspondingly provided on the backrest support; and a plurality of highly rigid side fixing seats symmetrically embedded in opposite outer ends of the main body and having a centered side mounting hole each for a side fastening element to extend therethrough into a threaded hole correspondingly provided on the chair backrest.
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein
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The middle fixing seat 2 is made of a hard material with high rigidity, such as plastic or metal material, and is embedded in a middle or central section of the main body 1. The middle fixing seat 2 has a centered through hole forming a middle mounting hole 21, an end of which is formed into a spot face 22, and the other end of which a transversely extended curved recess 23.
The side fixing seats 3 are also made of a hard material with high rigidity, such as plastic or metal material, and symmetrically embedded in opposite outer ends of the main body 1. Each of the side fixing seats 3 has a centered through hole forming a side mounting hole 31. An end of the side mounting hole 31 adjacent to the curved recess 23 is formed into a spot face 32, and the other end of the side mounting hole 31 opposite to the spot face 32 is provided along an outer periphery with a plurality of spaced pointed teeth 33.
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It is noted the middle fixing seat 2 and the side fixing seats 3 are closely connected to the backrest support 4 and the chair backrest 5, respectively, without loosely leaving any clearance between them. Moreover, the elastically deformable main body 1 allows the chair backrest 5 to incline backward or turn rightward and sideward relative to the backrest support 4 without causing shaking or swaying. The chair backrest mounting bracket of the present invention has simple structure but excellent strength and is easy to mount to enable not only effectively reduced manufacturing cost, but also prolonged usable life and enhanced competing ability in the market.
