Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Latching means
Patent
1986-03-13
1989-04-25
Goldberg, E. A.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Latching means
335172, H01H 920
Patent
active
048251836
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a switch latch for a switchgear having a supporting part that has two flat, parallel bearing plates joined by an assembling bracket, and is adapted for holding a latch mechanism. A switch latch of this type is known for instance from German Patent No. 921 878. The known structure shows a small automatic switch in the form of a mounting, with jacks supporting the switch mechanism. The jacks are retained in slits of the mounting via projections that are provided with recesses. German Patent No. 715 937 discloses a switch latch for a switchgear having two bearing plates, extending parallel to one another, for holding parts of the switch latch. The bearing plates have assembling tabs and are joined together by means of an assembling bracket to form a structural unit that is ready to be assembled. From German examined patent application DE-AS 11 78 501, a switch latch for a switch gear is known in which the bearing plates used to hold switch latch parts are kept spaced apart by offset spacer bolts. This switch latch is mounted in housing recesses and is secured against sliding crosswise by housing parts resting laterally on it. A structure similar to the above types is also disclosed by U.S. Pat. No. 4,123,734. The following references show further types known in this field: German examined application DE-AS 28 31 135, Swiss Patent No. 409 079, and British Patent No. 926,792.
SUMMARY OF THE INVENTION
It is the object of the invention to embody a switch latch of the above type such that it is easier to assemble, thereby simplifying switchgear manufacture. This object is attained by means of the novel switch latch for a power switch according to the present invention.
Embodying the switch latch according to the invention enables automated assembly, because the switch latch is manufactured as a ready-to-assemble structural unit that can easily be built into a switchgear housing. The switch latch can be built into the housing automatically, for instance by inserting the switch latch, with its assembling tabs that project at right angles, into prepared, matching housing recesses and securing it via an assembling bracket to elements integral with the housing, using securing means such as screws. The switch latch is thereby secured in the housing via three securing points: via the two tab ends that are inserted into matching openings in the housing, and via the securing means on the assembling bracket. These three securing points are located in approximately the same securing plane. The two bearing plates, disposed like offstanding lugs and between them receiving all the parts of the switch latch, extend at right angles to this securing plane. Since the securing means of the switch latch are disposed on only one end, the off-standing lug-like bearing plates can be fully exploited for receiving the switch latch parts, without having securing means for the switch latch in the way. A switch latch that is built into electric switchgear in this manner is integrated with a pole path. The present invention is preferably applicable to heavy-duty electric switches.
Because the supporting parts of the switch latch and the levers of the switch mechanism are embodied as flat parts and furthermore only simple bolts and tension springs are used for the switch latch, automated manufacture of the switch latch becomes possible, because such parts are easily stored. The switch latch is advantageously well suited for automated assembly, because the switch latch that is inserted into the housing openings intended for the assembling tabs needs to be fixed at only one point, in the vicinity of the assembling bracket, by means of a screw or the like.
As the invention is embodied, the bearing plates serve as stationary pivot bearings for an operating lever and a ratchet lever; the operating lever is joined via at least one tension spring to the pivot bolt of a toggle lever, one arm of which is articulated on the ratchet lever and the other arm of which is embodied for actuating a movab
REFERENCES:
patent: 2416170 (1947-02-01), Gano
patent: 2908782 (1959-10-01), Kiesel
patent: 2956135 (1960-10-01), Feil
patent: 3194922 (1965-07-01), Ellsworth
patent: 4219713 (1980-08-01), Maier
Donovan Lincoln
Goldberg E. A.
Licentia Patent-Verwaltungs GmbH
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