Stem having a fixing device

Details Stem having a fixing device Stem having a fixing device

1990-09-21

1991-04-02

Herrmann, Allan D.

Machine element or mechanism

Control lever and linkage systems

Elements

74551, 280279, 403 15, 403 31, D12118, 188 67, B62K 2118, B62K 2102, F16L 1700

Patent

active

050038397

ABSTRACT:
A stem is fixed to a head tube of a bicycle by a fixing device. The stem has an aperture formed in a center. A hole is formed in an upper end of the vertical tube for receiving a spring and a bolt. Two holes are laterally and oppositely formed in a lower portion of the stem, and each receives a piston. The aperture and the holes are filled with oil. The pistons are pushed to engage with an inner surface of the head tube when the bolt is threaded into the upper hole so that the stem can be firmly fixed to the head tube.

REFERENCES:
patent: 2033578 (1936-03-01), Kittel
patent: 3136149 (1964-06-01), Klein, Jr.
patent: 3990542 (1976-11-01), Dent et al.
patent: 4068858 (1978-01-01), Harrison et al.
patent: 4095911 (1978-06-01), Lacroix
patent: 4274301 (1981-06-01), Katayama
patent: 4305578 (1981-12-01), Dibrow et al.
patent: 4553769 (1985-11-01), Kawaguchi
patent: 4939950 (1990-07-01), Girvin

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