1. Field of the Invention
This invention relates generally to a composite material wheel rim structure wherein an inner rim surface of the composite material wheel rim is connected to each spoke, and the location of each connection is capable of sustaining the drilling of a threaded hole for threadedly joining an attachment cap of the spoke and adjusting the tightness of the spoke.
2. Description of the Prior Art
A bike wheel rim includes an outer rim surface which joins the tire and an inner rim surface connected to a wheel hub in the center of the wheel rim through a radial arrangement of spokes. The spokes are individually capable of being adjusted for tightness. The connection between the spoke and the inner rim surface of the wheel rim is carried out by threadedly joining an attachment cap to a threaded hole, where the attachment cap is provided with threads on its external side and is located at one end of the spoke, while the threaded hole is located at a corresponding location at the inner rim surface of the wheel rim. By adjusting the depth that the attachment cap is threadedly joined to the threaded hole, the tightness of a spoke can be correspondingly adjusted. Composite materials have lightweight and strength by nature, and are the preferred materials for the bike frame. However, when a composite material is used to produce the wheel rim, it will not have sufficient strength for sustaining the drilling of threaded holes at the inner rim surface of the composite material wheel rim for the threaded attachment of the spoke caps. Moreover, cracks are easily created at the drilled spots around the inner rim surface of a composite material wheel rim.
The objective of this invention is therefore to provide a composite material wheel rim structure, wherein the composite material wheel rim is connected by each spoke, and the location of each connection is capable of sustaining the drilling of a threaded hole.
The inner rim surface of the composite material wheel rim is engaged by the attachment cap of each spoke, and a rigid inner lining material is encased by the inner rim surface during the manufacture of the composite material wheel rim to form an integrated composite structure, thereby enabling the drilling of threaded holes in the inner lining material. Since the inner lining material is used to sustain the drilling of the threaded holes and the engagement by the attachment caps of the spokes, the inner rim surface of the composite material wheel rim therefore permits the threaded holes to be threadedly engaged by the attachment cap of each spoke for the alignment and adjustment of the tightness of each spoke.
To achieve the foregoing objects of the present invention, the invention shall now be described in detail with reference to the following preferred exemplified embodiments and the accompanying drawings.
Referring to
Number | Date | Country | Kind |
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097218351 | Oct 2008 | TW | national |
This is a divisional of U.S. application Ser. No. 12/588,378, filed on Oct. 14, 2009, which claims priority to Taiwanese Application No. 097218351, filed on Oct. 14, 2008, the entire contents of which are incorporated by reference herein.
Number | Date | Country | |
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Parent | 12588378 | Oct 2009 | US |
Child | 13602441 | US |