Bi-directional snap-action register display mechanism

Details Bi-directional snap-action register display mechanism Bi-directional snap-action register display mechanism

1989-11-09

1992-12-01

Brown, Brian W.

Registers

Transfer mechanism

235134, 235135, 235139R, G06C 710

Patent

active

051681463

ABSTRACT:
A bi-directional snap-action register mechanism for an odometer-type mechanical register display. The mechanism includes at least one register display wheel and a bi-directional cam mounted coaxially along a common shaft with the register display wheel. The bi-directional cam engages a helical groove formed along the shaft to allow lateral displacement of the bi-directional cam in a direction parallel to a rotational axis of the shaft. A pin 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.

REFERENCES:
patent: 3077302 (1963-02-01), Solari
patent: 3643072 (1972-02-01), Szeluga
patent: 4085287 (1978-04-01), Kullmann et al.
patent: 4204112 (1980-05-01), Lane
patent: 4298791 (1981-11-01), Muller et al.

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