Electricity: circuit makers and breakers – Interlocking
Patent
1997-12-03
1999-06-15
Scott, J. R.
Electricity: circuit makers and breakers
Interlocking
200 5012, 200 5024, 361608, H01H 920, H02B 11127
Patent
active
059124440
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns a device for influencing a traveling system of a mobile switching device as a function of the position of a door of a switchboard cell that accommodates the switching device. The traveling system has a threaded spindle and a slide is arranged in the access route to the threaded spindle. The slide can be blocked by a blocking element as a function of a push rod that is under an initial tension in a resting position due to a restoring force and can be operated by the door.
2. Description of the Prior Art
A travelling system is disclosed by German Patent No. 3 545 780. The traveling system is in a stationary mount and has a threaded spindle through which a cross element on which the switching device acts can be moved. The blocking element is mounted on the front end of a guide rod that is entrained by rotation of the threaded spindle in such a way that the blocking element always has the same basic position relative to the head of the threaded spindle. However, the blocking element can be displaced to release the position lock using the tool provided for operation of the threaded spindle. The slide that can be operated by the door of the switchboard cell blocks the guide rod with the blocking element through a flexible transmission element.
In another known switchgear design, the traveling system is mounted on the mobile-mounted switching device. In conjunction with this, it has already been proposed (e.g., German Patent Application P 44 20 582) that a blocking lever be provided on the traveling system of the switching device as a blocking element that can be operated by the door of the switchboard cell that accommodates the switching device. Such an arrangement requires a mechanical connection between the door or the push rod operated by the door and the blocking lever, but the latter changes its position relative to the push rod due to the traveling movement of the switching device. The object of that device is to create a suitable device that is automatically brought in to engagement by insertion of a switching device into a switchboard cell and is effective regardless of the different positions of the switching device inside the switchboard cell.
SUMMARY OF THE INVENTION
With a device with a traveling system that is mounted on the switching device and has a blocking lever that is mounted so it can pivot and has a working face, the object of the present invention is achieved due to the fact that the push rod has a leg that can be displaced along an inclined face as the operating element of the blocking lever. The inclined face is arranged at an angle of slope such that the blocking lever assumes a blocking position when the door is opened and can be transferred to a release position by the leg through an axial force acting on the push rod due to the closing of the door.
Due to the displacement of the push rod along the inclined face, there is a change in relative position of the respective section of the push rod with respect to the switching device, so the blocking lever can be operated. Therefore, with a suitable relative arrangement of the push rod and the power switch, the blocking lever is essentially acted upon with the closing of the door, regardless of which of the possible positions the switching device assumes, in particular the operating position, the test position or the isolating position.
With gas-insulated medium-voltage switchgear, a locking device is already known that serves to close the access to an operating shaft of a switch mechanism when the door of a cable connection compartment is opened (e.g. German Patent No. 41 31 328 A1). For this purpose, the locking device has a slide that can be operated by a transmission rod to cover the operating shaft. The transmission rod is connected to the sash fastener of the door closure in such a way that in opening the door the operating shaft is necessarily blocked to prevent operation. The present invention, however, concerns mobile-mounted switching devices
REFERENCES:
patent: 4491896 (1985-01-01), Rickmann
patent: 4724288 (1988-02-01), Kugler
patent: 5334808 (1994-08-01), Bur et al.
patent: 5691518 (1997-11-01), Jones et al.
Scott J. R.
Siemens Aktiengesellschaft
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