MECHANICAL DOSES COUNTER FOR A POWDER INHALER

摘要

A rotatably actuated counter (26) is disclosed. The counter includes a ratchet driven unit wheel (30) nested within a tens wheel (34). Each wheel has a radial face (84;60) displaying counting indicia (40;42). The tens wheel is transparent, allowing the indicia on the unit wheel to be viewed adjacent to the indicia on the tens wheel to provide a total count. A slave wheel (32) is positioned between the unit and tens wheels. A gear (70) on one face (72) of the slave wheel engages gear teeth (62) on the tens wheel. A Geneva mechanism (74) on the other face (76) is engaged by a foot (80) on the unit wheel once per rotation. The wheels are rotatably mounted within housing (36) having a sidewall (58) with a window (38) through which the count indicia (15) may be viewed. The unit wheel rotates in ten increments and then rotates the tens wheel through one increment by engaging and rotating the slave wheel.