Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Reexamination Certificate
2006-05-30
2006-05-30
Morris, Lesley D. (Department: 3611)
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
C180S191000, C030S195000
Reexamination Certificate
active
07051829
ABSTRACT:
A drive sprocket for a snowmobile, a drive train using the sprocket, and a method of using the sprocket to drive a track for a snowmobile. The drive sprocket includes a round base, a plurality of convolute lugs on the base, and a plurality of involute lugs on both sides of the base. The base is preferably disk shaped, and the convolute lugs are preferably aligned with the involute lugs. In the preferred embodiment, a number of convolute lugs is one half a number of involute lugs. The convolute lugs should line up with windows in a track for the snowmobile, and the involute lugs should line up with gaps between knobs on the track for the snowmobile. Preferably, the sprocket also includes a hub with a through hole for a drive shaft and stiffening arms radiating from the hub.
REFERENCES:
patent: 3472563 (1969-10-01), Irgens
patent: 3575474 (1971-04-01), Russ, Sr.
patent: 4987965 (1991-01-01), Bourret
patent: 5709440 (1998-01-01), Lecours
patent: 6000766 (1999-12-01), Takeuchi et al.
patent: 2003/0111904 (2003-06-01), Cormican
http://www.blackmagicracing.com/2002SiteLink/Level-6/antiratchet.htm (1 page, copyright 2001).
http://www.blackmagicracing.com/2003Pages/2003CatalogHTML/antiratchetsprocket.htm (2 pages, copyright 2002-2003).
Western Power Sports copyright and catalog pages (6 pages, copyright 2001).
SKI-DOO, figure from Catalogue de Pieces/Parts Catalog, Formula Plus X Mx X, 1991.
SKI-DOO, figure from Catalogue de Pieces/Parts Catalog, Alpine II, 1991.
SKI-DOO, figure from Catalogue de Pieces/Parts Catalog, Citation/E, Tundra/LT, 1991.
Butzer Dane C.
Wahl Bros. Racing
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