Machine element or mechanism – Elements – Cranks and pedals
Patent
1997-12-19
2000-01-18
Battista, Mary Ann
Machine element or mechanism
Elements
Cranks and pedals
384545, F16C 1908
Patent
active
060149132
ABSTRACT:
A crank spindle unit includes a crank spindle having an outer peripheral surface defining a first end, a second end and a hollow central portion. A plurality of first serrations are formed on the first end of the crank spindle, and a plurality of second serrations are formed on the second end of the crank spindle. A first guide surface having a first guide surface diameter is formed on the outer peripheral surface continuously with and inwardly from the plurality of first serrations, and a second guide surface having a second guide surface diameter is formed on the outer peripheral surface continuously with and inwardly from the plurality of second serrations. A first track groove is formed on the outer peripheral surface in proximity to the first end of the crank spindle, wherein a lowermost surface of the first track groove has a first track groove diameter. Similarly, a second track groove formed on the outer peripheral surface in proximity to the second end of the crank spindle, wherein a lowermost surface of the second track groove has a second track groove diameter. A diameter of the central portion between the first track groove and the second track groove is less than the first guide surface diameter and the second guide surface diameter.
REFERENCES:
patent: 3903754 (1975-09-01), Morroni
patent: 4704919 (1987-11-01), Durham
patent: 4811626 (1989-03-01), Bezin
patent: 5118205 (1992-06-01), Hoffmann
Battista Mary Ann
Deland James A.
Shimano Inc.
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