Pulmonary achievement trainer

Claim 1

A pulmonary achievement trainer for registering the strongest breath attained by a patient during a predetermined period comprising a vertically extending tube having an open lower end and a longitudinal elongated slot, a mouthpiece detachably connected to said tube and forming an air intake, said mouthpiece being of substantially L-shaped configuration having a portion extending vertically and a portion extending horizontally said vertically extending portion being sealingly connected to the opEn lower end of said tube, said horizontal portion having a bellows shaped section, a plate horizontally disposed in said tube, guide means in said tube and in said plate for movably mounting said plate for vertical motion along a contrained path within said tube, spring means in said tube engaging said plate for resisting an upward movement of said plate, indicia on said tube adjacent ot said slot, indicator means engaged in said slot, said indicator means having means engageable by said plate, said indicator extending outwardly of said tube cooperating with said indicia to visually indicate the amount of movement of said plate, and frictional means for retaining said indicator in a position corresponding to the furthest movement from the initial position attained.