From Wiktionary, the free dictionary
From drag + bar.
dragbar (plural dragbars)
- (US) A drawbar.
1985, Helmut Neunzert, The Road-vehicle-system and related mathematics:Those elements may result in applied forces and torques only (e.g. springs, dampers) or they may constrain the motions of the system as well (e.g. dragbars, wheels).