IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0640638
(1984-06-04)
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발명자
/ 주소 |
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
1 |
초록
▼
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 downwar
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.
대표청구항
▼
1. 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
1. 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. 2. The handlebar mounting stem of claim 1 wherein said head section has a free end, said free end having flanges on the sides thereof to impart strength and resistance to deformation of said free end, said free end of said clamping head being located on the underside of said side flanges of said neck section. 3. The handlebar mounting stem of claim 1 wherein the axis of said cylindrical clamping head is substantially perpendicular to a plane containing the axis of said post section. 4. The handlebar mounting stem of claim 1 wherein said free end of said clamping head is provided with a first bore and said neck section is provided with a second aligned bore, said aligned bores being adapted to receive a bolt disposed in said bores, which bolt is adapted to force said free end of said clamping head toward the underside of said side flanges of said neck section. 5. The handlebar clamping stem of claim 1 wherein said hollow post section has a perforation at the top thereof, said perforation being adapted to receive a bolt extending vertically through said hollow post, the lower end of said bolt being adapted to be threaded into a generally wedge-shaped nut engageable with a bottom surface of said post, said bottom surface of said post extending at an oblique angle to the axis of said hollow cylindrical post so that axial movement of said nut over said oblique bottom surface results in lateral movement as well as axial movement of said nut. 6. 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. 7. 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. 8. 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. 9. 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. 10. 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.
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