Electricity: conductors and insulators – Conduits – cables or conductors – Conductor structure
Reexamination Certificate
1999-03-19
2001-02-27
Kincaid, Kristine (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Conductor structure
C174S128200
Reexamination Certificate
active
06194666
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a push pull type control cable which is improved to impart a good operability with an added comfortability.
In a push pull type control cable which connects a shift lever to a vehicular transmission, a wire is provided by winding a side wire around a core wire, and arranged to be axially movably placed within a liner. A zinc plating treatment is provided on an outer surface of the side wire to impart a rust resistant property and facilitate a mobility at once between the wire and the liner.
On the other hand, the side wire forms a multitude of steel lines wound around the core wire at a predetermined lead angle.
However, an endurance of the zinc plating treatment has not been satisfactorily considered, and its thickness dimension has been 1.0~3.0 &mgr;m. With the passage of service time, it is feared that the zinc plating separates partly from the side wire due to the friction against the liner so as to increase a coefficent of friction. The increased coefficent of friction reduces a load efficiency which represents a ratio of an output load to input load so as to eventually reduce the operability and sensible quality. This resultantly requires the replacement of the control cable itself.
In the meanwhile, a relationship between the lead angle and the load efficiency has not seriously been taken into account. In order only to prevent the side wire from getting loose, the lead angle has been determined to be 25~30 degrees. With the increase of the lead angle, it is found that a contact area between the side wire and the liner increases to add a further frictional resistance therebetween so as to reduce the load efficiency. Once the contact area has increased, a frictional surface of the liner predominantly wears to increase the contact area acceleratively so as to significantly reduce the load efficiency with an added frictional resistance.
The reduced load efficiency requires an added operable force to deteriorate the sensible quality with decreased endurance. In recent years, it has been demanded to ameliorate the sensible quality, and at the same time, enabling consumers to a maintenance free period long enough to reach a product life span in the field of durable consumer goods such as a motor vehicle.
Therefore, the present invention has made with the above drawbacks in mind, it is a main object of the invention to provide a push pull type control cable which enables consumers to an extended maintenance free period with a high load efficiency and sensible quality.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a push pull type control cable including a conduit having a tubular liner made of a plastic material; a wire provided by winding a diameter-reduced side wire around a core wire, and arranged to be axially movably placed within the liner; and a plating being coated on an outer surface of the side wire, a thickness of the plating ranging from 5.0 &mgr;m to 20 &mgr;m.
With the plating coated to range from 5.0 &mgr;m to 20 &mgr;m, it is possible to provide a good operability and sensible quality for an extended period of time. When the control cable is used to connect a shift lever to a vehicular transmission, it is possible to practically eliminate the necessity of replacing the control cable with a new one. This reduces time and cost required to check and repair the motor vehicle.
In this instance, the conduit has the liner surrounded by a thin strand wire covered with a liquid-repellent jacket. With the side wire single wound around the core wire, it is possible to advantageously contribute to cost-saving while ensuring a good rigidity.
According to another aspect of the present invention, the side wire forms a multitude of steel lines which are single wound around the core wire at a lead angle ranging from 13 degrees to 25 degrees, and a diameter of each of the steel lines ranging from 0.25 mm to 0.60 mm.
With the lead angle ranging from 13 degrees to 25 degrees, it is possible to a contact area between the side wire and the liner, thus reducing the frictional resistance therebetween so as to increase the load efficiency with a least operable force. This produces a push pull type cable with a good sensible quality and endurance.
With the diameter of the steel lines of the side wire ranging from 0.20 mm to 0.60 mm, it is possible to secure a freedom flexible enough to route the cable while ensuring a good rigidity and endurance.
REFERENCES:
patent: 2605201 (1952-07-01), Howe
patent: 2689399 (1954-09-01), Gray
patent: 2870311 (1959-01-01), Greenfield et al.
patent: 3131469 (1964-05-01), Glaze
patent: 3676576 (1972-07-01), Dubernet et al.
patent: 3686428 (1972-08-01), Lombardi et al.
patent: 5170015 (1992-12-01), Kudo et al.
patent: 5558794 (1996-09-01), Jansens
patent: 5789708 (1998-08-01), Cocito
patent: 6078010 (2000-06-01), Funahashi et al.
Hayashida Takaaki
Imai Hideki
Chuo Hatsujo Kabushiki Kaisha
Kincaid Kristine
Morgan & Lewis & Bockius, LLP
Nguyen Chau N.
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