Assertion: linkage's joint | /r/Desires | line
Facets:
value: in the moving body
type: OTHER
value: to remain linear
type: PURPOSE
Source sentences:
text: A revolute pair, or hinged joint, requires a line in the moving body to remain co-linear with a line in the fixed body, and a plane perpendicular to this line in the moving body must maintain contact with a similar perpendicular plane in the fixed body.