Closure fasteners – Extension link
Reexamination Certificate
2001-06-15
2003-12-09
Donovan, Lincoln (Department: 2832)
Closure fasteners
Extension link
C292S139000
Reexamination Certificate
active
06659517
ABSTRACT:
The invention relates to an apparatus for transmitting a movement between two components, which, as a function of a first, translational movement of a first coupling element to which a first component is coupled, produces a translational movement of a second coupling element to which a second component is coupled.
Such an apparatus is known from DE 195 24 636 C1, for example as an angled drive for a high-voltage power breaker. This document describes the capability to drive three switch poles of a three-pole high-voltage power breaker by means of a common drive via a drive linkage, with each switch pole being connected to the drive by means of a crank which, firstly, changes the direction of the drive movement, and secondly produces a step-up ratio.
In this document, the different initial positions of the individual cranks result in a time offset in the operation of the individual switch poles.
Each individual angled crank comprises a two-armed lever whose lever arms are at right angles to one another, with the ends of the lever arms forming coupling elements to which, firstly, a vertical switching rod and, secondly, the horizontal drive rod can be coupled as components. Any translational movement of the free end of the first lever arm, which is connected to the drive rod, results in a translational movement of the free end of the second lever arm, which is connected to the switching rod.
The described design results in the switch poles switching in a staggered manner one after the other in time.
The present invention is based on the object of providing an apparatus of the type mentioned initially, which allows a variable step-up ratio using simple means.
According to the invention, the object is achieved in that the first and the second coupling element are connected to one another, such that they can move, by means of a first rigid element, and in that the first coupling element is connected in a hinged manner to a first lever which is mounted at a first, fixed-position bearing point such that it can pivot, and in that the second coupling element is connected in a hinged manner to a second lever which is mounted at a second fixed-position bearing point such that it can pivot, and in that the first and the second bearing point are spaced apart from one another, and are located on opposite sides of the movement path of the first rigid element.
When a movement is being transmitted, the apparatus according to the invention results in the first and the second component, which are coupled to one another by the apparatus, each being moved at essentially the same speed in a first phase of the movement, in the movement travel of the second component lagging behind that of the first component in a second phase, and in the second component being accelerated in a third phase. When a movement is being transmitted in the opposite movement sense, the second component is first of all accelerated with respect to the first component and, after this, the second component is retarded in a corresponding manner.
Advantageous refinements of the inventions can be found in the dependent claims
2
to
7
.
The fixed-position bearing points are advantageously each located in the plane of the movement paths of the rigid elements and of the coupling elements.
The coupling elements are each arranged in the end regions of the rigid elements and may be in the form of connecting bolts or of some other mechanical component, to which the various other parts such as the lever and rigid elements can be coupled. The coupling elements may also be in the form of a linkage.
The invention also relates to a high-voltage power breaker having a number of switch poles, at least two of which can be driven by a common drive, with at least one of the common driveable switch poles being connected to the drive by means of an apparatus as claimed in one of claims
1
to
5
.
A high-voltage power breaker has an interrupter unit in each switch pole, in which interrupter unit two switching contacts are brought into conductive contact with one another, or are disconnected from one another. For this purpose, at least one switching contact can be driven by means of the drive.
Such a high-voltage power breaker can easily be adjusted, for use in a polyphase high-voltage system having an apparatus according to the invention, in such a manner that the individual switch poles have a specific time offset, during switching on, with regard to the making of the first conductive contact between the switching contacts, for example with a lead or lag of 3 milliseconds between one another in each case. In this way, the various switch poles can be operated at a respectively advantageous time, with regard to the respective phase of the polyphase alternating current to be switched on.
It is also possible to use a common drive to operate two of the switch poles simultaneously for capacitive switching, while the third switch pole is operated with a time offset of 5 milliseconds after them. The third switch pole is then connected to the common drive by means of an apparatus according to the invention. For such offset switching operations, the individual switch poles are relieved as well as possible of the load involved in controlled operation in synchronism with a mains system.
REFERENCES:
patent: 2667554 (1954-01-01), Shores
patent: 3624329 (1971-11-01), Fisher et al.
patent: 3780354 (1973-12-01), Sharp
patent: 5510590 (1996-04-01), Hux
patent: 3810453 (1988-10-01), None
patent: 4015979 (1991-11-01), None
patent: 4110243 (1992-10-01), None
patent: 19524636 (1996-09-01), None
patent: 19705098 (1998-08-01), None
patent: 0 817 225 (1998-01-01), None
Kuntze Torsten
Malner Bernd
Schimmelpfennig Jens
Donovan Lincoln
Morrison & Foerster / LLP
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