Northeastern University

Starwinn Cycle Corporation

Jay Seiter

Jesse F Kuhn

Michael Witonis

Joshua Filgate

Matthew Bracken

Morgan Misek

A sequential planetary stack transmission system is provided. The system includes a stack of planetary gear sets, each gear set including a sun gear engageable with a rotatable central shaft, and freely rotatable concentrically about the central input or output shaft when not engaged with the central shaft. A plurality of planet gears engage with the sun gear, and a ring gear engages with the planet gears. The ring gears form a ring gear barrel rotatable as a unit concentrically with respect to the central shaft. A shifting assembly within the hollow central shaft engages sequentially with the sun gears to provide a desired gear ratio. The planetary stack assembly and the shifting assembly are disposed within a case. The system is suitable for a variety of applications, and is particularly suitable for bicycles.

Sequential planetary stack transmission system

A tool for inserting and extracting pins of roller chains includes a body having a bridge adapted to engage a chain and a drive screw assembly coupled to the main body on a first side of the bridge. The drive screw assembly includes a drive screw which is rotatable to provide a force and a pin mounted concentrically within the drive screw. The drive screw assembly further includes an alignment sleeve that surrounds the pin mounted concentrically within the drive screw. The alignment sleeve guides and supports the pin up to a face of a roller chain. The tool further includes a rotatable backing wheel coupled to the main body on a second side of the bridge. The rotatable backing wheel includes multiple channels such that the multiple channels correspond to different roller chains having different sizes.

Tool for extracting and inserting pins of roller chains

Growing community of inventors

Boston, MA, United States of America

Jay Seiter