Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Reexamination Certificate
2000-03-17
2001-06-05
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
C030S090200, C030S091200
Reexamination Certificate
active
06242699
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for processing the end of a coaxial high frequency cable, which has a tubular inner conductor, a dielectric enclosing the same, a tubular outer conductor arranged over the same concentrically to the inner conductor, and a sheath of insulation material enclosing the outer conductor.
Such an apparatus is advantageously used at the installation site where coaxial high frequency cables (HF cables) are to be interconnected or connected to devices such as senders and receivers. For this connection, the current state of the art uses connectors with an outer sleeve and an inner pin, which after installation have electrically conductive contact with the outer conductor and the inner conductor of the HF cable. For this purpose, the end of the HF cable must be formed in such a way that the required electrical contact can be made. This is not a problem for the inner conductor of the HF cable. Its outer conductor, however, must first be laid bare. For this purpose, the sheath enclosing the outer conductor is manually cut with a knife and removed to a predefined length. During this action, the outer conductor can easily be damaged by the knife. Furthermore, it is often difficult with this working method to meet the length for which the sheath is to be removed.
SUMMARY OF THE INVENTION
The object of the invention is to define an apparatus for processing the end of a coaxial HF cable, which is simple to handle and with which the sheath is dimensionally exactly removed from the outer conductor to the predefined length.
This object is attained in an apparatus of the initially described type by using a pot-like device with a cylindrical hollow space, in which:
the diameter of the hollow space of an input area located at the open end of the device corresponds to the diameter of the HF cable including the sheath,
at the end of the input area located within the device, at least one sheath knife for cutting the sheath is arranged, the blade of which projects into the hollow space,
the diameter of the hollow space behind the input area corresponds to the outside diameter of the outer conductor of the HF cable,
at the closed end of the device at least one knife is arranged whose blade for cutting the outer conductor, the dielectric, and the inner conductor of the HF cable projects into the hollow space, and
in the center, within the hollow space, extending in its axial direction, a cylindrical pin is arranged, the outside diameter of which corresponds to the inside diameter of the hollow inner conductor of the HF cable.
For the dimensionally accurate removal of the end of an HF cable, this device is placed on the end face of said cable. The central pin serves as a guide. As the apparatus is rotated about its axis and axial pressure is simultaneously applied in the direction of the HF cable, the sheath knife helically cuts open the sheath. The chip, thus created, is lifted by the outer conductor of the HF cable and removed through an opening of the device in the area of the sheath knife. The device, thereby, continues to be pushed further onto the HF cable until said cable pushes against the floor of the closed end of the device. The knife located at that point then performs a cut that flatly severs in one plane the end of the HF cable. At the same time, the cut of the sheath knife changes to a circular cut. The sheath is now removed from the outer conductor of the HF cable to a length predefined by the apparatus. The end of the HF cable is ready for installation of a connector.
REFERENCES:
patent: 4731928 (1988-03-01), Jackson
Ahrens Gunter
Bergmann Detlef
Greiner Martin
Nagel Reimer
Alcatel
Nguyen Chau N.
Reichard Dean A.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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