| 摘要 |
An improved counter wheel assembly comprising an indicia wheel, a reset gear, a reset control mechanism for resetting the indicia wheel to a zero position, a drive gear, and a drive clutch for selectively engaging the indicia wheel to the drive gear. In one form, the drive clutch comprises an elongated pawl engageable with a frusto-conical surface integral with the drive gear and adjacent to and immediately inwardly of the rim of the indicia wheel. In a second embodiment, the drive clutch means comprises a pair of substantially identical V-shaped pawls that pivot in tandem to selectively engage serrations of a substantially cylindrical engagement surface.
|
