Geometrical instruments – Distance measuring – Of length by rolling contact
Reexamination Certificate
2007-02-20
2007-02-20
Fulton, Christopher W. (Department: 2859)
Geometrical instruments
Distance measuring
Of length by rolling contact
C033S772000
Reexamination Certificate
active
11372574
ABSTRACT:
An electronic measuring device is disclosed which includes a pair of wheels connected to an axle that passes through a drive gear. The drive gear is enmeshed to a second gear which, in turn, is coaxially connected to an encoder disk. The encoder disk has spaced-apart fins around its outer periphery. As the wheels turn and the encoder disk rotates, the fins and openings between the fins pass between an emitter and a receiver. The emitter and receiver are linked to a controller which calculates the distance traversed by the wheels based upon the number of fins that pass between the emitter and receiver, or with an active counting system (ACS). The controller also includes functions to establish start and stop points for a measurement and an easy means for dividing a measured distance into equal parts or segments and a means for marking the boundary points that define the segments when the measuring device is rolled back across the measured distance. The device can be used on both planar and non-planar surfaces.
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Gist Daily
Nash Derek J.
Smith John C.
Spanski Jeffrey L.
Williams Michael
Fulton Christopher W.
Irwin Hand Tools/North America
Marshall & Gerstein & Borun LLP
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