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Browse Prior Art Database

INDICATOR WHEEL POSITION CHANGER MECHANISM

IP.com Disclosure Number: IPCOM000005495D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2001-Oct-09
Document File: 2 page(s) / 102K

Publishing Venue

Motorola

Related People

Thomas R. Kawall: AUTHOR

Abstract

The mechanism forms the main structure of a counter assembly; e.g., a means of indicating time (hours, minutes, etc.) or mileage as an odometer. It can also be used for products that may require alphabetical readout such as in games or novelty items. Typically, an electrical integrated circuit timing circuit is the means for providing a regulated electrical power source to drive the mechanical mechanisms.

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,@ MOTOROLA Technical Developments Volume 3 March 1983

INDICATOR WHEEL POSITION CHANGER MECHANISM

By Thomas R. Kawall

    The mechanism forms the main structure of a counter assembly; e.g., a means of indicating time (hours, minutes, etc.) or mileage as an odometer. It can also be used for products that may require alphabetical readout such as in games or novelty items. Typically, an electrical integrated circuit timing circuit is the means for providing a regulated electrical power source to drive the mechanical mechanisms.

The purpose of the mechanism is to rotate an indicator wheel. This is accomplished by a reset push tooth and a reset hold tooth that ratchet a first position indicator wheel.

   This ratchet operation moves around a central pivot point which moves by a cantilever action han- dled through the socket (in bellcrank) and ball (end of verge arm) that receives its motive power from an electrical coil. The electrical coil is pulsed and in a novoltage condition a living spring (plastic) tension arm forces the mechanism to return to reset position automatically. When the coil is energized the verge arm goes to pull position forcing the entire mechanism to move, thereby rotating the indicator wheel.

   The various parts are stacked and snapped into the segments of the flexible acetyl (plastic) frame which acts as a carrier for the shafts and other elements. A cluster of idler gears plus the automatic resetting bellcrank are mounted on a shaft which is snapped into the frame. The gears are roughly posi- tioned by built-in divider ribs. The set of indicator wheels plus one ten-tooth star index and indicator

gear are mounted on another shaft and also snapped into place. At the end of this cluster of indicator gears is the living spring which also provides spring thrust horizontally against the indicator cluster to prevent backlash.

   The teeth of the star indicator wheel protrude into the bellcrank. The bellcrank has an enlarged opening which has a pair of radially spaced inwardly extended teeth. The living torsion arm spring which is a part of the bellcrank provides the reset of the mechanism by its movement along an area called the fixed pivot, which is part of the frame. Each of the i...