Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – With latch- or trip-reset means
Patent
1990-04-26
1991-12-24
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
With latch- or trip-reset means
H01H 920
Patent
active
050756613
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a locking device with a lever to block against the unintentional actuation of a switching device, in particular of a vacuum interrupter, with an electromagnetic actuator, whereby the blocking lever having two neighboring coils, which has a cross sectional shape approximating a U-shape, is adjustably supported within the interstitial space between the coils against the force of a reset spring, and, in the unexcited state of the electromagnetic actuator, [the blocking lever] is arranged with an end face opposite a working surface of a movable part of the electromagnetic actuator with a small clearance in proportion to the movable part of the electromagnetic actuator's working stroke, which recurs during the excitation of the coils.
A locking device of this type has become known through the teachings of DE-OS 35 24 526. For the faultless way of operating such a locking device it is necessary that, when the solenoid actuator is being closed, the blocking lever be quickly moved away from the working surface of the movable part of the solenoid actuator, e.g. of the movable armature, such that this movable part can perform unhindered the intended working stroke. As a rule, this condition is satisfied in that the motive resistance of the movable part of the solenoid actuator, together with the motive resistance of the switching points to be actuated, in particular of the vacuum interrupters, results in a speed of the sequence of movements which is considerably less than that of the blocking lever. By means of the invention, the known locking device is also able to be used in the case that the said motive resistance is considerably less, and, consequently, a hindrance of the normal closing of the switching device could occur by means of the blocking lever.
For this purpose, according to the invention, it is provided that the blocking lever carry an extension consisting of ferromagnetic material which extends into the interstitial space of the coil on the side of the blocking lever which is turned towards the coils of the electromagnetic actuator.
The extension is formed by an extension of the midsection of the U- or C-profile and is designed in one piece with the blocking lever as a blade which is arranged at an acute angle to the blocking lever and starting from the end of the blocking lever which neighbors the bearings.
An adaptation of the locking device to switching devices with a different motive resistance, e.g., which can arise through the use of vacuum interrupters with a lower power requirement, is now able to be achieved in quite a simple manner, since only the extension needs to be changed, e.g. by its angular positioning. The basic shape of the blocking lever and thus in particular the relative position of its end face and the working surface of the movable part of the electromagnetic actuator, which working surface interacts with this, can, in contrast, remain unchanged.
In the case of an electromagnetically actuated relay as a blocking device, it is already known (FR-A-1 075 557) how to provide a flexible blocking element, which is firmly affixed on one side, with an extension which extends laterally in the direction of the pole face of the relay, which has a blade consisting of ferromagnetic material on its end. The junction between the plate- spring-like section of the blocking element which extends approximately parallel to the coil, and the extension is designed as an acute-angled bend, which forms a stop face for the clapper-type armature of the relay. This kind of a flexible blocking element, however, is not suitable for blocking a stronger magnetic force as it occurs in a mechanical switching device for power circuitry of the aforesaid type, particularly in the case of a vacuum contactor. If, on the other hand, the flexible blocking element is equipped with a larger material cross section in order to magnify its supportive effect, then the motive resistance for the release of the closing operation increases. Therefore, a greater portion of the working magnetic flux of the
REFERENCES:
patent: 3249716 (1966-05-01), Haydu et al.
patent: 4237436 (1980-12-01), Setescak
patent: 4683451 (1987-07-01), Grunert et al.
Kaletta Joachim
Traore Ibrahim
Zeuke Reinhard
Donovan Lincoln
Picard Leo P.
Siemens Aktiengesellschaft
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