Knight fork

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Sager Cushion Fork
"Softail Springer"

A jumper fork is a pushed short swing arm with an auxiliary fork from Harley-Davidson .

history

The sprung front fork with auxiliary fork (also known as “Sager cushion fork”) patented by JHSager on March 26, 1907, was revised by William Harley and tacitly adopted for the Model 4. The Sager-Cushion fork remained in the Harley-Davidson product range until 1929, when the fork had to undergo a technical change due to the installation of a drum brake in the front wheel. The front wheel suspension, henceforth referred to as springer fork, was produced until 1953 and replaced by the telescopic fork . In 1988, a revised version of the Springer fork was reintroduced into the special “Softail Springer” model; the last “Springer models” rolled off the assembly line in 2009. When customizing the Springer fork still plays a major role.

technology

Important functional components of a jumper fork are the fork carriage with auxiliary fork, the short swing arms on both sides, the bracket strut and the springs that do their job under the lamp unit. The spring fork has short spring travel due to its principle. The Softail Springer (2008) model had a spring travel of 58 mm. When it was first introduced, the Springer fork was an advance in the front wheel control of two-wheelers, today it is considered a technical anachronism.

References and comments

  1. U.S. Patent 848,324
  2. ^ Herbert Wagner: At The Creation . Wisconsin Historical Society Press, 2003, ISBN 0-87020-351-7 , p. 103.
  3. Jerry Hatfield: Standard Catalog of American Motorcycles 1898-1981 . Krause Publications 2006, ISBN 978-0-89689-949-0 , p. 156
  4. Due to their lack of damping properties.
  5. motorradonline.de Harley-Davidson Screamin 'Eagle Softail Springer (accessed on September 26, 2013)