Portable mechanical backrest

The utility model provides a portable mechanical backrest which comprises a frame, limiting sleeves are arranged on the two sides of the front end of the frame, elastic reciprocating mechanisms are arranged in the limiting sleeves, and a backrest plate is arranged between the elastic reciprocating mechanisms on the two sides. The backrest is independently arranged, using is very convenient, the backrest can be directly fixed to an existing seat backrest for use, the application range is wide, the height of the backrest plate can be adjusted through the elastic reciprocating mechanism, and therefore the backrest plate can adapt to different back curve requirements, and automatic reset can be achieved under the inapplicable condition. 本实用新型提供了一种便携式机械靠背，包括框架，所述框架的前端两侧设有限位套筒，所述限位套筒内设有弹性往复机构，两侧的所述弹性往复机构之间设有靠背板；将靠背单独设置，使用十分方便，可直接固定在现有座椅靠背上使用，应用范围广泛，且通过设置弹性往复机构使得靠背板能够进行高度调节，从而适应不同的背部曲线需求，在不适用的情况下能够自动复位。