Adjustable back pad

Abstract

The present invention discloses an adjustable back pad which is formed primarily by a back rack and two back rests. The back rack includes plural slot holes which are left-and-right symmetric and two elastomers. A rear side of each back rest is provided with an elastomer and an elastic element. When assembling the back rack with the back rests, a screw first penetrates a washer and then one slot hole of the back rack, followed by being locked into a lock hole at a center of the elastomer on the back rest. As there are ten elastic buffering pivots between the two back rests and back rack, the ergonomic and breathing back pad of the present invention can completely mitigate a pressure exerted to a lumbar vertebrae or a lower back of a user, thereby soothing fatigue and soreness and providing a most comfortable sitting cushion.

1 . An adjustable back pad comprising:
 a back rack, a rear side of which is provided with at least one set of slot holes that are left-and-right symmetric, with that inner sides to the slot holes are provided with two elastomers; and   two back rests, which are fixed respectively at a front end of the back rack, with that a back plate of each back rest is provided with plural openings, a rear side of each back rest is provided with an elastomer, and a center of the elastomer is provided with a lock hole;   when assembling the two back rests with the back rack, a screw penetrating a washer and then passing through one slot hole of the back rack, followed by being locked into the lock hole of the elastomer on the back rest for positioning,   
     
     
         2 . The adjustable back pad according to  claim 1 , wherein the elastomer on the back rack is a U-shaped elastic object which is provided with a buffering function. 
     
     
         3 . The adjustable back pad according to  claim 1 , wherein the elastomer on the back rest is a U-shaped elastic object which is provided with a buffering function. 
     
     
         4 . The adjustable back pad according to  claim 1 , wherein a rear side of each back rest is provided with an elastic element which is constituted by a spring, a flexible tube, a fixing plate, a screw, a washer and a fixing seat; the screw penetrating the washer and then a through-hole of the fixing plate and next being locked into the lock hole of the fixing plate of the back rest for positioning, clips on the fixing plate clamping the spring with an exterior side of the spring being then. sheathed with the flexible tube, thus forming the elastic element.