Variable length crank arm assembly
US6640662B1 · kind B1 · utility
Inventor
Key dates
| Filing date | May 9, 2002 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | May 9, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/2167
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A variable length crank arm assembly (10) is disclosed which is mounted to a bicycle (11). The crank arm assembly (10) has a pair of oppositely disposed crank arms (25) each having a boss (26) from which extends a forked, crank arm member (27). Each crank arm member (27) has a first portion (28) that extends to a second portion (29). The second portion (29) has a proximal stop (31) and a distal stop plate (32). The crank arm assembly (10) also includes a slide (34) slideably mounted upon the second portion (29). A pair of proximal springs (37) are mounted upon the arm member second portion (29) which bias the slide (34) toward distal stop plate (32). A pair of distal springs (38) are mounted upon the second portion (29) which bias the slide (34) toward the proximal stops (31). A pedal assembly (41) is rotatably mounted to the slide (34). The pedal assembly (41) includes a shaft (42) extending from slide (34) and a conventional pedal (43) rotatably mounted to shaft (42).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.