Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1996-07-22
1998-03-17
Luong, Vinh T.
Machine element or mechanism
Control lever and linkage systems
Elements
745511, B62K 2112, B62K 2116
Patent
active
057274274
ABSTRACT:
A pivotable handlebar stem for use in a bicycle enables a user to ride on a bicycle normally when the stem is securely engaged with a column. Due to the provision of resilient devices provided within the column and undulating end faces between the engaging face of the column and the stem, the handlebar together with the stem are able to be detachably connected with the column, such that the bicycle will not occupy too much space when parked. The bicycle handlebar stem comprises a column having an extension tube projecting therefrom, the extension tube having a rib formed longitudinally therein, the extension tube also having an apex and two sides each having an opening, a clamp with a first end pivotally connected to a first end of the extension tube, a piston slidably received within the extension tube, the piston having a first end which is securely connected to the clamp, a positioning button securely received within one of the openings, a first resilient element disposed between a bottom face of a recess in the piston and a lower face of the positioning button, and a second resilient element fixedly provided between the rib of the extension tube and a second end of the piston.
REFERENCES:
patent: 569354 (1896-10-01), Ryan
patent: 3933373 (1976-01-01), Gammelgaard
patent: 4417745 (1983-11-01), Shomo
patent: 5144859 (1992-09-01), Malone
patent: 5168601 (1992-12-01), Liu
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