1. Field of the Invention
The present invention relates to a cable, more especially to a cable for vehicles.
2. Description of the Prior Art
Metal cables or wires are widely used in brake systems of vehicles for triggering the brake clamp. Conventional metal cables are formed by twisting a plurality of filaments which are the same with each other, as shown in TW 227238, U.S. Pat. No. 6,119,747, and U.S. Pat. No. 6,405,774. However, the conventional cables are formed by less than 27 filaments so that structure strength is insufficient. In addition, the filaments are twisted staggeredly. Thus, when the cable is radially pressed inward, the filaments may be compressed and deformed.
During braking, the cable is pulled axially, so the tension may result radial deformation. As a result, the cable is lengthened to reduce accuracy of braking.
The main object of the present invention is to provide a twisted cable having better structure strength and smaller amount of longitudinal deformation to transmit forces.
To achieve the above and other objects, a twisted cable of the present invention includes a main body. The main body includes a central filament and a plurality of twisted filaments wherein the twisted filaments are arranged around the central filament. The twisted filaments are classified into an inner layer, an intermediate layer, and an outer layer which are arranged outward. The twisted filaments include first filaments, second filaments, and third filaments. Cross-section area of each first filament is same with cross-section area of each second filament, and cross-section area of each third filament is smaller than the cross-section area of each first filament. The cross-section areas of each first filament, each second filament, and each third filament are smaller than cross-section area of the central filament respectively. The inner layer includes six first filaments. The intermediate layer includes twelve second filaments. The outer layer includes eighteen third filaments. The twisted filaments are twisted around the central filament.
Thereby, filaments of the present invention are arranged evenly, and appropriate gaps are kept between filaments. Thus, structure strength is promoted, and longitudinal tension can be transmitted evenly. As a result, accuracy may not be reduced due to the longitudinal deformation.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention.
Please refer to
In the present embodiment, each of cross-sections of the central filament 11 and the twisted filaments is a circle, and the central filament 11 and the twisted filaments are all made of metal. Preferably, ratio of diameters of cross-sections of the central filament 11, each first filament 12, each second filament 13, and each third filament 14 is approximately 23:22:22:21. Practically, diameters of cross-sections of the central filament 11, each first filament 12, each second filament 13, and each third filament 14 are 0.23 mm, 0.22 mm, 0.22 mm, and 0.21 mm respectively. In a cross-section of the twisted cable, as shown in
In the present invention, the radial connected structures help prevent the main body from radial compression. The second filaments and the third filaments which not belong to the connected structures are also prevented from radial compression due to the support of the connected structures. Thus, the main body is prevented from longitudinal and axial deformation. As a result, tension can be transmitted accurately, and controlling becomes easier. Besides, the second filaments and the third filaments among the connected structures can serve as cushions to provide bendability.
Number | Date | Country | Kind |
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102115000 | Apr 2013 | TW | national |