|Perry B-10 disassembled. Note damage to cone nut in upper right.|
|Date stamp (?) on Perry reaction arm.|
|Coaster brake hub with shell sectioned. Image via wikimedia commons.|
|Perry parts listing. Via Rat Rod Bikes.|
This design has since fallen out of use, but was one of several competing designs found in the mid 20th century. In the 1970's it was so uncommon in the States as to go unremarked in the 1973 "Glenn's Complete Bicycle Manual" which is, as the title states, quite complete. Sturmey Archer released a similar design in 1963 as the SC, and it was produced until 1978, however I have yet to come across any of these hubs. Successors to the SC (the SC1 1978-80 and the SCC 1978-82) replaced the roller bearing design with a cone-clutch design similar to current coaster hubs. As far as I can tell the SC and Perry (B-10, B-100) hubs were largely found only on English bicycles, with their import to the US being limited. Verifying some of the claims on what hub was on which make/model of bike is possible, but not easy, and is beyond the scope of what I want to dig into.
Sheldon Brown noted that the English coaster brakes have a fixed right hand cone and a square end on the drive-side of the axle, used to hold the axle while adjusting the hub. His site has a good scan of both an exploded diagram and parts list with compatibility between hubs. Something to note is that these cones are not necessarily permanently fixed to the axle, they simply lack wrench flats for adjusting.
|Note the square end of the axle, a specific wrench came with these hubs for holding the axle while adjusting the hub. The fixed cone has also been loosened and un-threaded slightly.|
In this particular hub, there is polishing and pitting on the driver where the rollers sit under load. The rollers themselves are largely unscathed, with the exception of chipping on the ends of the rollers where they contacted the edge of the driver. The addition of these flakes to the lubricating oil likely did not aid in prolonging the hub's life. More serious issues with this hub are the damaged brake actuator, the missing tab from the brake cylinder, and the throughly trashed non-drive-side (NDS) cone nut. In this particular design, the cone nut has two ears which engage the reaction arm, and prevent the cone from spinning under the action of the brake cylinder. One of these ears is missing, as is a large section of the cone which would have been supporting the ear. In discussing this hub with a Perry aficionado, it seems that this is a common mode of failure.
|Clockwise from top left: Brake cylinder showing missing tab, and cracking around the remaining tab; Left cone with damage and missing ear; Brake actuator with crushed end and deformed drag spring; Roller bearings with chipped ends.|
Robert Alverson 2012, CC BY-SA 3.0. All images and logos property of their respective owners, unless listed otherwise images were taken by the author.
http://en.wikipedia.org/wiki/File:R%C3%BCcktrittbremse_geschnitten.jpg Sectioned coaster brake hub image from wikimedia commons, posted by user Stahlkocher. CC BY-SA 3.0
Rat Rod Bikes has a few threads on the Perry hubs, the one linked is a sectioning of a B-100. Image of the Perry parts listing is from the linked thread, which cites classicbicyclefanatics.com as the source. I was unable to locate the original there.
http://sheldonbrown.com/coaster-brakes/sc.html Adjustment tips and parts listing for Sturmey Archer SC hub, and parts compatibility with other makes.
www.sturmey-archerheritage.com Sturmey Archer timeline, hub production dates, exploded views and parts lists.
Grace's Guide on Perry and Co. A short time-line of the company, which was in the business of pen nibs before entering into bicycle and motorcycle parts.
Mark Gell's scan of the Hercules service guide for the Perry hub.