Adjustable handlebar stem for a bicycle or similar vehicle
OwnerCato Halsinventor
Life of this patent
Estimating the term…
Abstract
An adjustable and lockable handlebar stem includes a post to be clamped in a forward frame tube of a bicycle, one upper arm and one lower arm pivotably supported at first bearing points on the post, and a handlebar mounting member with a through hole for accommodating a handlebar. The handlebar mounting member is pivotably supported by the two arms at second bearing points. The arms can be locked together, for example by means of a stud in a slide groove. Due to unequal distances between the first bearing points and the second bearing points, there is achieved an ergonometrically favorable rotation of the handlebar itself when the position of the complete mechanically movable unit is changed.
Claims19
An adjustable handlebar stem for a bicycle or a similar vehicle, said stem comprising:
- a post to be clamped in a forward frame tube of the vehicle;
- upper and lower arms pivotally mounted at first ends thereof to said post about respective upper and lower first bearings having parallel pivot axes that extend horizontally in a normal standing position of the vehicle;
- a handlebar mounting member having opposite ends pivotally mounted relative to second ends of said upper and lower arms about respective upper and lower second bearings having parallel pivot axes extending parallel to said pivot axes of said first bearings, said handlebar mounting member having therethrough a horizontal hole for clampingly receiving a handlebar, said hole having an axis extending parallel to said bearing axes;
- said upper and lower arms and said handlebar mounting member defining a movable system that is movable relative to said post about said first bearings between upper and lower extreme end positions;
- locking means for locking said movable system at a desired position corresponding to either of said extreme end positions or at selected positions therebetween;
- and
- a first distance between said upper and lower first bearings being different from a second distance between said upper and lower second bearings, whereby during movement of said movable system between said upper and lower extreme end positions thereof the rotational orientation of said handlebar mounting member relative to said axis of said hole is variable.
Dependencies are inferred from the claim text.