Patent ID: 6857864
Filing Date: 2005-02-22
Classification: B25B,F01C

Abstract:
1. An air motor, comprising: a motor cylinder having with three vertices and three sides and an inner chamber of a substantially triangular cross-section, each of said sides having a first air channel disposed generally adjacent a second air channel, said first and second air channels disposed in outward spaced relation from said inner chamber and extending longitudinally along said motor cylinder; an air rotor rotatably supported in said motor cylinder and having a plurality of longitudinal slits extending in a longitudinal direction thereof, said longitudinal slits rad ally guiding moveable lamellae; a plurality of drive chambers formed in said inner chamber between said air rotor and said motor cylinder between respective vertices of said motor cylinder, each of said drive chambers rotating into operative communication with an air inlet and hen into operative communication with an air outlet; a front cover dispose on one end of said motor cylinder and a rear cover disposed on the opposing end of said motor cylinder; wherein at least one o said front cover and said rear cover are rotatable relative to said motor cylinder to switch an incoming supply of air between said first air channel and said second air channels; air outlet ports formed in at least one of said front cover and said rear cover, said air outlet ports selectively positionable to be in communication with either said first air channels or said second air channels; said air outlet ports comprising partially annular-shaped outlet recesses formed in the corresponding cover that open at least towards said motor cylinder.