Land vehicles – Wheeled – Occupant propelled type
Patent
1990-03-09
1994-09-27
Marmor, Charles A.
Land vehicles
Wheeled
Occupant propelled type
280275, 18832219, 384 49, B62K 2508
Patent
active
053501853
ABSTRACT:
There is disclosed a shock absorber which is contained within the head tube of a bicycle. The shock absorber has an outer cylinder that is rotationally received within the head tube and secured at its upper end to a handlebar support member, such as a gooseneck. An inner cylinder is slidably received within the outer cylinder and secured at its lower end to the fork that supports the front wheel. Each of the cylinders has longitudinal grooves, the inner cylinder having longitudinal grooves on its outer surface which align with longitudinal grooves on the inside wall of the outer cylinder. A plurality of bearing balls are received in the tracks which are formed by the longitudinal grooves of the cylinders and a thin-wall bearing retainer is concentrically received between the inner and outer cylinders having a plurality of apertures at predetermined spacing which are aligned along the bearing tracks, each of the apertures capturing one of the bearing balls. Finally a compression spring is captured between the upper end of the inner cylinder and the upper end of the outer cylinder to bias the cylinders in an extended, telescoping position. Preferably, the assembly also includes a rod that is concentrically received in the assembly of the cylinders. The upper end of the rod is fixedly secured to the upper end of the outer cylinder and, at its lower end, supports a valve/piston that is slidably received within the inner cylinder. The inner cylinder is closed at its lower end and the piston has an annular seal to provide oil chambers in the inner cylinder below and above the valve/piston and improve the shock absorbency of the assembly.
REFERENCES:
patent: 448750 (1891-03-01), Kenfield
patent: 3208767 (1965-09-01), Moulton
patent: 4268055 (1981-05-01), Bell
patent: 4553769 (1985-11-01), Kawaguchi
patent: 4705491 (1987-11-01), Andersson
patent: 4815763 (1989-03-01), Hartmann
patent: 4881750 (1989-11-01), Hartmann
Kagen Alan M.
Marmor Charles A.
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