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US 6,805,372 B2Granted
Bicycle fork and pivot for same
AssigneeTime Sport International
InventorJean-Marc Gueugneaud
Life of this patent
Estimating the term…
Abstract
A bicycle includes fork head (2) from which two sleeves (3a,3b) branch off and, on the side opposite to the sleeves, a tubular pivot (4) including a lower cylindrical portion (4a) integral with the fork head, and an upper cylindrical portion (4b) for fixing a stem. The external diameter (Da) of the lower cylindrical portion (4a) of the pivot is larger than the external diameter (Db) of the upper cylindrical portion (4b) of the pivot, and a transitional zone (4c) links the two parts (4a,4b) with different diameters.
Claims13
A bicycle fork, comprising:
- a fork crown (2);
- two fork stems (3a, 3b) extending from the fork crown;
- and
- on a side of the fork crown opposite a side with the two fork stems, a tubular pivot (4, 104),
- the pivot comprising
- a cylindrical bottom part (4a, 104a) secured to the fork crown,
- a cylindrical top part (4b) for securing a handlebar stem without need of a supplemental piece fixed to the fork crown, and
- a transition region (4c) linking the top part and the bottom part,
- an outside diameter (Da) of the cylindrical bottom part (4a, 104a) being greater than an outside diameter (Db) of the cylindrical top part (4b), and
- the pivot having a frustoconical exterior surface, the outside diameter of the frustoconical exterior surface decreasing from the bottom part upward towards the top part,
- the fork crown (2), the two fork stems (3a, 3b) and, the pivot comprising a single piece made of composite material.
8 more elements
A bicycle fork, comprising:
- a fork crown (2) with two fork stems (3a, 3b) extending from a first end of the fork crown and a tubular pivot extending from a second end of the fork crown, opposite the first end,
- the pivot comprising a cylindrical bottom part (4a, 104a), a cylindrical top part (4b) for securing handlebars, and a transition region (4c) linking the top part and the bottom part,
- an outside diameter (Da) of the cylindrical bottom part (4a, 104a) being greater than an outside diameter (Db) of the cylindrical top part (4b),
- the pivot having a frustoconical exterior surface, the outside diameter of the frustoconical exterior surface progressively decreasing from the bottom part upward towards the top part, wherein,
- the fork crown (2), the two fork stems (3a, 3b) and, the pivot comprise a single piece of composite material.
2 more elements
A bicycle fork, comprising:
- a single piece, composite material tubular pivot and fork crown,
- the fork crown merged, at a first end, with two fork stems and, at a second opposite end, with the tubular pivot,
- the pivot having a reducing wall thickness from a cylindrical bottom part, located at the second end, toward a cylindrical top part,
- the top part providing a mounting surface for mounting a handlebar stem.
1 more element
Dependencies are inferred from the claim text.