Low-voltage power switch with relative auxiliary switch

Details Low-voltage power switch with relative auxiliary switch Low-voltage power switch with relative auxiliary switch

1996-08-08

1998-06-30

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

335167, 335 20, 335190, 200 68, H01H 900

Patent

active

057740313

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a low voltage power switch with relative auxiliary control switch. A relative auxiliary control switch is defined as a pilot switch which is actuated only when the generally multi-pole low voltage power switch is tripped.


PRIOR ART

In DE-B-28 14 070, the relative auxiliary control switch is actuated by of a flexible intermediate element by a driver pin of the latchable support lever of the latching mechanism of the low voltage power switch. In DE-B-28 14 071, the relative auxiliary control switch is actuated by means of a spring-loaded, lever-operated shaft by the support lever of the breaker mechanism.
DE-A-29 20 775 describes a low voltage power switch in which the pre-loaded actuating tappet of a relative auxiliary control switch is also actuated by the support lever by means of a flexible intermediate element. This prior art publication also indicates that the pre-loaded actuating tappet of a normal auxiliary control switch, i.e. of an auxiliary control switch which signals the position of the main contacts, is actuated by means of an additional flexible imtermediate element by a radial extension of the actuating shaft which carries the moving main contacts. This last solution, however, cannot be applied to a relative auxiliary control switch. The disadvantage of the devices of the prior art is that relative auxiliary control switches must be actuated in a complex and complicated manner by the breaker mechanism. Therefore, on multi-pole low voltage power switches, it is impossible to avoid additional and damaging blowout openings between the center pole, which is generally connected to the breaker mechanism, and an outer pole, which generally corresponds to the housing for the relative auxiliary control switch.
The object of the invention is therefore to make possible a simple actuation of the relative auxiliary control switch, which actuation is independent of the breaker mechanism.


DESCRIPTION OF THE INVENTION

The invention teaches that this object can be accomplished by a low voltage power switch with relative auxiliary control switch, with a molded housing in which the relative auxiliary control switch is installed or to which the relative auxiliary control switch is attached, with interacting stationary and moving contacts for each pole, and with an actuating shaft which carries the moving contacts, in which the low voltage power switch has a breaker mechanism which, on one hand, contains a toggle or star actuating means, and on the other hand is linked during opening and closing movements with the moving contacts, and can also be tripped by a tripping means, whereby the opening angle of the moving contacts or of the actuating shaft when the breaker is tripped is greater than in the de-energized state, along with a roller lever which is mounted in the molded housing, which roller lever is linked to a pre-loaded actuating tappet of the relative auxiliary control switch, and finally has a radial extension which is located on the actuating shaft so that this extension acts on the roller lever exclusively in the tripped state.
As a result of the use of the special angular ratios created by the breaker mechanism by means of a single connecting element in the form of the roller lever, a simple interface is created which makes possible a reliable transmission of force between the actuating shaft and the relative auxiliary control switch via a short, dire path. In contrast to similar devices fo the prior art, the complicated actuation of the relative auxiliary control switch by the breaker meachanism by means of complicated lever systems is eliminated. All that is required is a simple plastic part in the form of the roller lever. For multi-pole low voltage power switches, the direct connection path between the actuating shaft and the relative auxiliary control switch also provides improved separation between the breaker mechanism and the space in which for the relative auxiliary control switch is housed, and thus between the individual poles.
DE-A-38 12 950

REFERENCES:
patent: 3599130 (1971-08-01), Murai
patent: 4151386 (1979-04-01), Nicol
patent: 4321440 (1982-03-01), Fujiwara et al.
patent: 5502426 (1996-03-01), Blanchard et al.
patent: 5508670 (1996-04-01), Mantzouridis et al.

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