DE1089444B - Locking device for switch drives - Google Patents

Description

GERMAN

The invention relates to a locking device for switch drives, in particular for use for electrical circuit breakers for low voltage.

In the case of electrical switches, e.g. B. low voltage circuit breakers, the moving contact system is made possible by the necessary strong contact pressure springs and the electrodynamic current forces when the switch is opened at such speed in brought the open position that the contact system rebounds after reaching the switch-off position and itself starts moving again in the direction of the switch-on position. Every new movement of the contact system in The switch-on direction is unfavorable as this can lead to re-ignition or re-ignition of the arc.

It is known to have a fixed stop with damping for damping when switching off moving masses Material to provide. However, this device cannot cause the moving masses to bounce back be prevented. It has also become known a shock absorber for intercepting rapidly moving switch parts of circuit breakers, in which as a shock absorber an arrangement of toggle levers under the influence of springs is used, which in the The damping process can be brought into its dead position. However, such an arrangement is proportionate expensive, since toggle levers, adjustable stops and springs needed. In addition, this arrangement is difficult to accommodate in a limited space.

According to the invention there is another, simpler way taken to prevent moving switch parts from bouncing back.

The invention consists in the arrangement of a fixedly mounted at one end point and with the selector shaft of the switch via a lever arm articulated to the knee joint, which is activated during the switch-off movement out of its original kinked position and thrown over its extended position as a result of inertia is, whereby it lies against a fixed stop, by which a further buckling of the Joint and thus a movement of the switch drive in the switch-on direction as a result of bouncing back is prevented.

Immediately after the end of the switch-off movement, the knee joint, z. B. by its weight, automatically to a certain extent, namely so far that the switch is ready to be switched on again, in its original state Kinked back.

The invention is explained in more detail using an exemplary embodiment.

The figure shows an arrangement according to the invention in the switched-off state after completion of the Switch-off movement of a switch.

Locking device
for switch drives

Applicant:

LICENTIA Patent Administration - G. m. B. H., Frankfurt / M., Theodor-Stern-Kai 1

Leo Mittler, Neumünster,
has been named as the inventor

In the lateral boundary wall 7 of a low-voltage circuit breaker a fixed pin 10 is let in, around which the link 2 of the toggle lever consisting of the links 2 and 6 rotates. That Link 6 is articulated via a lever 3 to the switching shaft 1, which carries the moving part of the switch.

The two links 2 and 6 of the toggle lever have elongated holes 11 and 12 and are secured by a bolt 5, which slides with play in the elongated holes, connected to each other.

The arrangement works as follows: The switch is in the off position in the figure. The knee joint is slightly buckled due to its own weight and is in its rest position. If part 8 and the switching shaft 1 connected to it are now moved in the switch-on direction (direction of the arrow), so the knee joint is bent even further. The dash-dotted central axes the links 2 and 6 and the lever 3 get into the line indicated by the broken line Location.

If the switch turns off, part 8 moves in the opposite direction of the arrow until it moves is limited by the stop 9. The toggle mechanism is activated by the quick switch-off movement thrown beyond its extended position into the opposite bent position. The link 6 lies down at the same time against the fixed stop 4. At this moment, the moving part of the switch is set again in the switch-on direction (arrow direction) in motion, but is now in the locking position

Development located toggle lever prevented. If the moving parts of the switch have come to a complete rest, the toggle joint falls back into the rest position shown by its own weight, and the Switch is ready to be switched on again.

. 009 608/245

i 089

/ The briefly acting locking device / according to the invention has a very simple structure, works • reliably and requires little installation space.

Claims (4)

Patent claims: »■ ο 1. Interlocking device for switch drives, in particular electrical circuit breakers that preferably acts on the switching shaft after the switch-off movement, characterized by an on one end point firmly mounted and articulated to the selector shaft via a lever arm Knee joint, which during the switch-off movement from its kinked position due to inertia to over its The straight position is thrown over and lies against a fixed stop, through which a new Buckling of the joint and thus a movement of the switch drive in the switch-on direction is prevented as a result of bouncing back. 2. Locking device according to claim 1, characterized in that the knee joint is directly after the end of the switch-off movement, automatically to a certain extent, in the opposite The kinked position goes back, whereby the locking of the switch mechanism is canceled, so that the switch is ready to be switched on again. 3. Locking device according to claim 1 and 2, characterized in that the automatic The knee joint is returned to the switched-on kinked position by gravity. 4. Locking device according to claim 1 to 3, characterized in that the joint parts of the knee joint are connected to one another in an elongated hole with play. Considered publications:
German patent specifications No. 913 193, 581 1 sheet of drawings ■ 009 608/245 9.60