Title: Variable-leverage brakes for bicycles

Abstract: Multi-stage engagement of a bicycle wheel rim is effected by force simultaneously applied to a slidable caliper and a pivoted caliper causing sequential displacement of the calipers. Displacement of the slidable caliper at a low leverage ratio is terminated by a locking action in response to initial brake contact to cause subsequent pivotal displacement of the pivoted caliper at a high leverage ratio for increased braking contact with the wheel rim.

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Inventors: Armstrong, Allen E. (Lexington, MA, US)

Application Number: 602668
Filing Date: 1975-08-07
Publication_date: 1977-03-29
Assignee:
Primary Class(es): 188/24.15 188/2D, 188/72.9
Other Classes:
US Patent Ref:

3680663	Aug, 1972	Kine	188/72.
3795290	Mar, 1974	Hori et al.	188/72.
3870127	Mar, 1975	Wilson et al.	188/24.

Other Refs: 265,8011,553,9501,140,326

Mar, 1966	AU
Dec, 1968	FR
Nov, 1962	DT

Primary Examiner: Halvosa, George E. A.
Assistant Examiner:
Attorney: Zalkind & Shuster