Machine element or mechanism – Automatic operation or control
Patent
1990-09-18
1992-06-23
Herrmann, Allan D.
Machine element or mechanism
Automatic operation or control
74 971, 74112, 200400, B23Q 1116, F16H 2144, F16H 2700
Patent
active
051232910
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a snap-action spring drive for load-reversing switches of multiple contact switches, which includes a storing spring that can be loaded by a drive having a shaft which rotates either clockwise or counterclockwise, and an element for controlling the contact movement, which preferably is a cam disk or a connecting link control and is driven during the reversing process by the storing spring, performs a rotational movement.
2. Discussion of the Background Information
Conventional load-reversing switches for multiple contact switches of voltage regulating transformers have a resistance quick throw-over switch having switch contact shafts which are controlled by means of a cam disk drive driven by an energy storage device. In this connection, the cam disk is moved from one end position to another, and back again by a back and forth movement, regardless of the particular direction of movement of the selector. This means that the contacts which last closed during the movement of the cam drive in one direction open first during the reverse movement, or that the contacts which first opened during the movement in one direction close last during the reverse movement.
This rigid contact sequence during the load-reversing operation is unsuitable for thyristor load-reversing switches.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a switching mechanism which permits the control of loadreversing and auxiliary contacts as well as magnetic triggers, the sequence of movement of which is different in relation to the main contact movement during the opening and closing operation.
This object is attained by the apparatus of the invention. It is characterized in that the storing spring and the driven element are connected with a coupling element which can only be rotated in one direction, independent of the direction of rotation of the drive.
By means of the invention it is possible to perform the control of contact sequences in a simple manner and to safely avoid switching errors.
A further development of the invention resides in the fact that end positions of the coupling element are offset by 180.degree. in with respect to each other. Jolt-free switching to both halves of the applied program disks is thereby assured.
In accordance with an embodiment of the invention, a movable stop is provided in connection with each end position, in which a detent present on the coupling element can be latched after each switching operation. Exact initial and end positions of applied program disks are thereby attained.
In accordance with a further characteristic of the invention, a fastening pin connected with the storing spring is provided on the diametrical line of the coupling element which originates at the detent, where the distance between the detent and the fastening pin is greater than the radius of the coupling element.
This results in a very advantageous point of application of force of the storing spring on the coupling element.
In a development of the invention, the storing spring can only be loaded in one direction. This results in the advantage of an uncomplicated, and thus particularly operationally safe design.
In accordance with a further embodiment, the loading of the storing spring is performed by means of an electric motor provided within the switch housing and acting directly on a drive shaft. The advantage here is that increased dependability is attained because of the reduced number of components.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a top view of a coupling element according to the invention;
FIG. 2 illustrates a switching mechanism in sectional view, in which the coupling element shown in FIG. 1 is used;
FIG. 3 illustrates a second embodiment of a switching mechanism according to the invention in sectional view, where the coupling element and the detent device are spatially separated; and
FIG. 4 illustrates the principle of a link motion in an elevational and lateral view.
DETAILED
REFERENCES:
patent: 2995043 (1961-08-01), Lusk et al.
patent: 3211870 (1965-10-01), Lusk et al.
patent: 4798922 (1989-01-01), Roberts
International Search Report PCT/AT89/00029.
Annex to the International Search Report PCT/AT89/00029.
Elin-Union Aktiengesellschaft fur Elektrische Industrie
Herrmann Allan D.
Laub David W.
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