Apparatus for tapping current from a busbar

Electrical transmission or interconnection systems – Plural supply circuits or sources – Sources distributed along load circuit

Reexamination Certificate

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Details

C191S063000, C104S093000

Reexamination Certificate

active

06191502

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to an apparatus for tapping current from a busbar by means of at least one roller which is arranged, for example, on a trolley.
Normally, current is tapped from busbars using, for example, apparatuses which move in respect to the busbar. These include, in particular, trolleys which are guided along rails, on which the busbars are normally also located. Trolleys are known and are commercially available in widely differing forms and configurations. The trolleys which are referred to in the present exemplary embodiment relate primarily to the transportation of workpieces, material or the like between processing stations in which processing activities are carried out on the workpiece. Such systems are nowadays used, for example, in the electronics industry, in order to fit components to printed circuits or the like. However, it is only by way of example and, according to the invention, apparatuses for tapping current from a busbar may be used in many industrial fields.
One example, in which an apparatus according to the invention for tapping current from a busbar is described, is disclosed in EP-A-0 728 647. The claim there covers the provision of a roller which is composed of electrically conductive material and rolls on the busbar being provided for tapping current.
In practice, it has been found to be disadvantageous that short voltage interruptions occur per busbar when tapping current using a roller, due to expansion joints, dirt or offsets, which then lead to malfunctions, for example on electronically controlled trolleys.
In order to ensure correct operation of electronic components, no voltage interruption may occur below, for example, 5 V (TTL signals) or 12 V (CMOS) etc.
SUMMARY OF THE INVENTION
The present invention is based on the object of overcoming this disadvantage and of avoiding voltage interruptions.
In order to achieve this object, the one roller also has associated with it at least one further roller, adjacent to it and at a distance from the same busbar.
Where one of the two rollers arrives at a expansion joint, an offset or a dirty region, then any possible voltage interruption is prevented by the second roller, thus ensuring a continuous power supply, for example to an electronic controller.
The present invention relates in particular to current transfers from busbars for current collectors for electrically powered vehicles with electronic traction current control. Expansion joints are in this case required because the structure which supports the busbar is composed of a different material than the busbar itself. Lengthy structures which cannot resist expansion would lead to the electrical conductors being damaged by temperature differences.
Joints other than expansion joints also occur where so-called switches are installed in a straight piece of rail.


REFERENCES:
patent: 1443873 (1923-01-01), Donham
patent: 1570933 (1926-01-01), Bennington
patent: 1572946 (1926-02-01), Owens et al.
patent: 1821425 (1931-08-01), Coseo

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