The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 2001
Filed:
Aug. 20, 1999
Brian T. Jordan, Chicago, IL (US);
John D. Cheever, Chicago, IL (US);
SRAM Corporation, Chicago, IL (US);
Abstract
A rotatable handgrip twistshifter (,) mountable coaxially about a bicycle handlebar (,) that abruptly or discontinuously increases the mechanical advantage when shifting a front derailleur from a smaller to a larger chainring. A control cable (,) is slidably connected to the handgrip (,) such that during rotation of the handgrip (,) to effect gear shifts from the middle to larger chainrings of a triple chainring crankshaft (,), the cable (,) is abruptly dropped toward the handgrip axis of rotation thereby increasing the mechanical advantage or leverage of the shifter (,). Alternatively, the control cable (,) is slidably connected to the pivot arm (,) of a front derailleur such that during rotation of the handgrip (,) the cable (,) is deflected away from the derailleur pivot axis (,), likewise, increasing the mechanical advantage of the derailleur.