Electricity: circuit makers and breakers – Interlocking – Drawout-type switchgear
Patent
1998-03-13
2000-02-29
Scott, J. R.
Electricity: circuit makers and breakers
Interlocking
Drawout-type switchgear
361609, H01H 924, H02B 1100
Patent
active
060311916
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a sliding frame for a movable power switch with a break contact arrangement and a protective device that can be actuated by a traveling motion of the power switch to prevent contact with voltage-conducting parts of the break contact arrangement, wherein the protective device has a lever arrangement to which the power switch is applied and a protective plate that can be moved by the lever arrangement.
BACKGROUND OF THE INVENTION
A sliding frame for a movable power switch is described in German Patent No. A 33 44 667 and European Patent A 0 577 111. Both of the known arrangements ensure that the protective plate is actuated during the relatively short stroke of the power switch and that the power switch can subsequently be brought into engagement with the break contact arrangement without further movement of the protective plate. In one of the known arrangements, this is achieved through lever arrangements, located on the side walls of the sliding frame, while in the other known arrangements, similarly operating lever components are attached to the rear wall of the sliding frame, where the break contact blocks working together with the power switch are located.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a particularly compact design of the lever arrangement working with the protective plates. This is necessary because, in one of the known arrangements, the side walls of the sliding frame are used as carriers of actuating elements of the protective plates, while in the other known arrangement the side walls of the sliding frame are kept free of such elements, but the actuating elements have an inconveniently great depth.
According to the present invention, the object is achieved by the following features: which is configured as a rocker and has a rocker opening for engaging a guide pin of the other lever designed as a control lever to be acted upon by the power switch; supports, on its end opposite the pivot, a pivoting arm for the protective plate; so that the guide pin of the control lever is next to the pivot of the rocker in its normal position and while the protective plate opens, and the control lever with its guide pin can be moved against the action of the restoring spring after the protective plate has been actuated, without further pivoting of the rocker.
The arrangement according to the present invention can be designed with a relatively shallow depth, since the control lever only needs to follow the straight-line motion of the power switch in part and can deflect along the link opening basically across the path of the power switch.
In medium-voltage switchgears with carriage or sliding frame power switches, arrangements are known (German Patent 35 42 979 A1) where a fixed-position connecting link is used as means for moving the power switch. A protective plate is actuated by a lever rod, which has a control lever mounted near the connecting link. This control lever is actuated through a crank pin of the drive of the carriage or sliding frame. Thus in this arrangement the protective plate is not directly driven by the motion of the power switch, as is the case with the aforementioned known arrangements, on which the present invention is based. Also the connecting link is not a part of the lever rod actuating the protective plate, but of the drive. Therefore, with a protective plate directly driven by a travel motion, there was no incentive to provide a control lever in conjunction with a connecting link designed so that the depth of the lever arrangement is considerably less despite the control lever being carried over the entire path of the power switch.
In particular with low-voltage power switches, it is desirable in view of the relatively short travel between the test position and the operating position that a shorter section of the travel segment be sufficient for actuating the protective plates. This can be enhanced by the fact that the aforementioned rocker opening is arranged in relation to the rocke
REFERENCES:
patent: 4183073 (1980-01-01), Clausing
patent: 4443676 (1984-04-01), Castonguay
patent: 4447682 (1984-05-01), Castonguay
patent: 4713501 (1987-12-01), Herrmann
patent: 4773870 (1988-09-01), Sinnig
patent: 5343355 (1994-08-01), Ishikawa
Ahlert Torsten
Deylitz Erhard
Scott J. R.
Siemens Aktiengesellschaft
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