Degree wheel and method of using the same
Patent 4580446 Issued on April 8, 1986. Estimated Expiration Date: 
April 12, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 12, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3283569 Indicating device Apparatus and method for extrapolating the angular position of a rotating body Rotational position detecting apparatus Detector for top dead center position of a piston for automobile engine Piston top-dead-center detector Patent #: 4296629 InventorApplicationNo. 06/599542 filed on 04/12/1984US Classes:73/116, MOTOR AND ENGINE TESTING33/600AutomotiveExaminersPrimary: Kreitman, Stephen A.Attorney, Agent or FirmInternational ClassesG01M 15/06 (20060101)G01M 15/04 (20060101) AbstractAn improved degree wheel device includes a degree wheel which is adjustably rotatable relative to the crankshaft on which it is carried. The wheel can be easily adjusted so that a zero degree reading corresponds to top dead center of piston travel. Much of the calculation necessary to determine cam phasing, cam lobe centerline, valve overlap, and the like is thereby eliminated. The degree wheel preferably includes counterclockwise 0° to 360° indicia for a direct and calculation-free determination of the duration of tappet lift.Other References
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