Aiming at suitcase doors with pneumatic rod as a complementary extension mechanism which can be opened in two directions,in order to design the fixed location and parameters of pneumatic rod reasonably,in case that door’s barycenter bias in one side of the shaft,with the existing restrictive conditions, through the use of sketch function of UG software and with simple calculation.

The author continues the research of the other types of installing the air spring pole after the article issued in this journal of No.

Computer aided design for stay bar of piling ship;