Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1996-06-03
1998-10-20
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
335202, H01H 6702
Patent
active
058252690
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electromagnetic switchgear, and in particular a contractor.
BACKGROUND INFORMATION
An electromagnetic switchgear is described in German Patent No. 34 02 836, where locking means which are activated depending on the explosion chamber connection with the bottom part are provided for the movement of the contact bridge support. At least the switch-on of the switchgear is avoided in this manner when the explosion chamber is removed. The locking means consist of, for example, a spring-loaded latch that is pushed back by the contour of the explosion chamber. Another variation of the electromagnetic switchgear described in the above-mentioned German Patent involves the use of a locking bar in the bottom part which locking bar can be moved at right angles to the direction of movement of the contact bridge support and which can be moved into the locking position depending on the connecting member between the explosion chamber and the bottom part. The actuation of the locking bar takes place, for example, in that the connecting member is a fastening screw whose conical tip engages with a control opening of the locking bar which is spring-loaded in the locking direction.
European Patent Application No. 0 515 731 describes an electromagnetic switchgear in which the contact bridge support remains safely locked with the housing when the explosion chamber is removed even when shaken or impacted and in which the locking bar can always be fully released by the fastening element of the explosion chamber with reliability and without intermediate positions. In the above-mentioned European Patent Application, the locking bar accommodated in the housing in a guided manner locks the contact support under the action of a spring. The locking bar can be held against the spring force in the unlocked position by way of the fastening element used of the explosion chamber, the explosion chamber being put on during operation. The spring causes the locking bar to safely lock the contact support in the housing when the fastening element is removed even when shaken or impacted. Intermediate positions are practically excluded. Here, the locking bar is rotatably supported in the housing and can grip from behind and retain in the locked position a part of the contact bridge support.
European Patent Application No. 0 547 928 describes a contactor in which an electomagnet that opens and closes the switching contacts can be actuated manually via a push-button. By actuating the push-button, a flap is carried along, an opening in the housing being released or sealed as a result. The intermediate links slide on one another with different directions of movement. The locking action takes place here via two corner elements having a slanted edge contour. Moreover, a rotatable locking bar having a torsion spring is used as a locking means.
U.S. Pat. No. 3,728,506 describes an electromagnetic switchgear in which locking means are designed as a slide bar, the explosion chamber of the switchgear having a contour adapted to the slide bar.
An object of the present invention is to create an electromagnetic switchgear that with a simple design guarantees that the contact bridge support is safely locked when the explosion chamber has been removed. This objective is achieved in that means are provided on the locking means and on the explosion chamber by way of which the locking means slide in a link into a position where the contact bridge support is unlocked when the explosion chamber is connected to the bottom part. An advantageous embodiment of the present invention is achieved if the locking means are designed as a slide bar having a slanted edge contour as means and if the explosion chamber has a contour adapted to this intended for engagement. Moreover, it is advantageous if the locking means are designed as a rotatable locking bar which is held by a torsion spring in the locking position, and if the locking bar is provided with a slanted contact surface by way of which the locking bar can be ro
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Donovan Lincoln
Siemens Aktiengesellschaft
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