Bicycle handlebar stem
OwnerDavid K. McMurtreyinventor
Life of this patent
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Abstract
A bicycle handlebar drop stem is disclosed wherein the step is manufactured from a single piece sheet metal blank. The blank is configured by a series of dies such that it is formed into a cylindrical post having an integral neck section and handlebar receiving head. The neck and head extend downwardly at an acute angle to the cylindrical post. To accommodate this downward angulation of the neck relative to the post, the blank is notched at the interface of the neck and cylindrical post sections of the blank and depending flanges of the configured stem are welded to the cylindrical post.
Claims10
A one-piece, sheet metal bicycle handlebar mounting stem comprising,
- a hollow cylindrical post section adapted to be mounted within the stem of a fork of a bicycle,
- a neck section integral with and extending from the top of said post section, said neck section having a top portion and a pair of side flanges, said top portion defining an acute angle with said post section, one edge of each of said pair of said flanges extending generally parallel to the axis of said cylindrical post section, said one edge of each said pair of side flanges being welded to the periphery of said post section, and
- a handlebar receiving head section of substantially cylindrical shape formed integral with said neck section.
The method of manufacturing a one-piece sheet metal bicycle handlebar mounting stem which comprises,
- stamping a sheet metal blank, said blank having an integrally connected post forming section, a neck forming section, and a head forming section,
- forming said post forming section of said blank into a generally hollow cylindrical post,
- forming said neck forming section of said blank into a top portion and a pair of side flanges extending from said top portion,
- bending said blank so that said neck portion of said blank extends at an included acute angle to said post section and edges of said flanges are located in juxtaposition to said hollow cylindrical post,
- forming said head section into a generally cylindrical handlebar clamping head, and
- welding said side flanges of said neck portion to said hollow cylindrical post.
A one-piece, sheet metal bicycle handlebar mounting stem comprising,
- a hollow cylindrical post section adapted to be mounted within the stem of a fork of a bicycle,
- a neck section integral with and extending from the top of said post section, said neck section having a top portion and a pair of side flanges, said top portion defining an acute angle with said post section, each of said pair of flanges having one edge located in juxtaposition to said cylindrical post section, said one edge of each of said pair of side flanges being welded to the said cylindrical post section, and
- a handlebar receiving head section of substantially cylindrical shape formed integral with said neck section.
A one-piece, sheet metal bicycle handlebar mounting stem comprising,
- a hollow cylindrical post section adapted to be mounted within the stem of a fork of a bicycle,
- a neck section integral with and extending from the top of said post section, said neck section having a top portion and a pair of side flanges, said top portion defining an angle with said post section, one edge of each of said pair of said flanges extending generally parallel to the axis of said cylindrical post section, said one edge of each of said pair of side flanges being welded to the periphery of said post section, and
- a handlebar receiving head section of substantially cylindrical shape formed integral with said neck section.
The method of manufacturing a one-piece sheet metal bicycle handlebar mounting stem which comprises,
- stamping a sheet metal blank, said blank having an integrally connected post forming section, a neck forming section, and a head forming section,
- forming said post forming section of said blank into a generally hollow cylindrical post,
- forming said neck forming section of said blank into a top portion and a pair of side flanges extending from said top portion,
- bending said blank so that said neck portion of said blank extends at an angle to said post section and edges of said flanges are located in juxtaposition to said hollow cylindrical post,
- forming said head section into a generally cylindrical handlebar clamping head, and
- welding said side flanges of said neck portion to said hollow cylindrical post.
A one-piece, sheet metal bicycle handlebar mounting stem comprising,
- a hollow cylindrical post section adapted to be mounted within the stem of a fork of a bicycle,
- a neck section integral with and extending from the top of said post section, said neck section having a top portion and a pair of side flanges, said top portion defining an angle with said post section, each of said pair of flanges having one edge located in juxtaposition to said cylindrical post section, said one edge of each of said pair of side flanges being welded to the said cylindrical post section, and
- a handlebar receiving head section of substantially cylindrical shape formed integral with said neck section.
Dependencies are inferred from the claim text.