Endless belt power transmission systems or components – Pulley having circumferentially spaced portions of drive...
Reexamination Certificate
2007-10-01
2010-12-28
Mansen, Michael R (Department: 3654)
Endless belt power transmission systems or components
Pulley having circumferentially spaced portions of drive...
C474S087000, C474S148000
Reexamination Certificate
active
07857720
ABSTRACT:
A synchronous belt drive system comprising an obround sprocket (10) having a toothed surface and at least one linear portion (16) disposed between two arcuate portions (14,15), the arcuate portions having a constant radius (R1, R2), the linear portion having a predetermined length, a second sprocket (300) having a toothed surface, the second sprocket engaged to the obround sprocket by an endless toothed member (200), the second sprocket connected to a rotary load, the rotary load having cyclic torque fluctuations, and a radius (R1) of the obround sprocket (10) oriented at a belt entry point (201) which coincides with a maximum amplitude of a cyclic torque fluctuation such that a span length (SL) of the endless toothed member is made to vary in a manner that substantially cancels the cyclic torque fluctuations.
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Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration from the International Searching Authority Mailed on Apr. 25, 2008.
Dougherty, Esq. Thomas A.
Dunlap, Esq. Paul N.
Liu Henry
Mansen Michael R
The Gates Corporation
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