公开(公告)号：US3739165A

公开(公告)日：1973-06-12

申请号：US3739165D

申请日：1972-01-27

Applicant: BENDIX CORP

Inventor： ESKEN R

IPC: G01L7/16 ,  G06D1/02

CPC classification number: G01L7/16

Abstract: A digital display device is disclosed for displaying increments of mechanical movement, which includes a movable piston member having an ordered series of numerals inscribed thereon along its longitudinable axis and disposed in a bore having a window adapted to register with individual numerals on the piston. The piston position in the bore is controlled by venting of fluid pressure on one end thereof which is normally applied to both the ends with this venting in turn controlled by registry between a series of ports on a movable control plate and a series of ports in the bore wall which have a vernier spacing relationship therebetween so that a slight incremental movement of the valve plate produces a much larger movement of the piston in the bore. When combined with a similar second piston and bore arrangement controlled by a simple porting control performed by the same control plate, a digital display of control plate incremental movement in units and tenths of units of these increments is provided.