BI-DIRECTIONAL SNAP ACTION REGISTER DISPLAY MECHANISM

A bi-directional snap-action register mechanism for an odometer-type mechanical register display. The mechanism includes at lease one register display wheel (61) and a bi-directional cam (17) mounted coaxially along a common shaft (1) with the register display wheel. The bi-directional cam (17) enga...

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Bibliographic Details
Main Authors SWINSON, THIERRY W, BENNETT, RICHARD L, MARSHALL, JOHN D, COLE, KENNETH L
Format Patent
LanguageEnglish
French
Published 04.08.1993
Edition5
Subjects
CALCULATING
COMPUTING
COUNTING
COUNTING MECHANISMS
COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
PHYSICS
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Summary:A bi-directional snap-action register mechanism for an odometer-type mechanical register display. The mechanism includes at lease one register display wheel (61) and a bi-directional cam (17) mounted coaxially along a common shaft (1) with the register display wheel. The bi-directional cam (17) engages a helical groove (15) formed along the shaft to allow lateral displacement of the bi-directional cam in a direction parallel to a rotational axis of the shaft (1). A pin (i4) is biased by a spring into contact with the bi-directional cam. Rotation of the shaft causes the bi-directional cam to be moved with respect to the pin. The cam abruptly rotates through a predetermined angular distance when the point of contact of the biased pin with the cam moved from a smooth portion to a step transition portion of the cam. The abrupt rotation of the cam is communicated to the register display wheel to cause a new display position to be moved into view.
Bibliography:Application Number: EP19900403171