EP0828270B1 - Electrical switch gear - Google Patents

Description

The invention relates to an electrical device with at least a control and / or operating element, through its adjustment at least one electrical quantity and / or at least a trigger mode can be influenced, the control and / or Control element after an adjustment process required for operational reasons by a blocking element against another unauthorized person and / or unintentional adjustment is protected. Such a device is e.g. known from DE-11-9102942.

For devices on the market, e.g. thermal Overload relays are covers for the control and / or operating elements known as available as an accessory component, or are designed as hinged windows attached to the housing.

The disadvantage of these covers is that they are an accessory component carried out (e.g. during IBS work) can or hinged window in the open state with neighboring other electrical equipment to undesirable Covers.

The invention has for its object without special accessory components or unwanted covering other electrical Resources to create a device that at same volume of the overload relay an unauthorized and / or unintentional adjustment of the control and / or operating elements prevented.

The problem is solved according to the invention in that the locking member as one between two end positions slidable element is formed, which in its an end position the control and / or control element for a Releases adjustment and in its other end position Prevents adjustment, the sliding element as Sliding window is executed and the locking member in lockable and / or sealable in its other end position is such that a manual blanker is also open End position of the sliding window is not covered or is blocked.

While in one end position the controls and / or controls can be adjusted in the other End position that can be locked or sealed, the control and / or Control elements covered or blocked.

FIG 1

Gerätefront des Relais

FIG 2

Querschnitt des Relais

FIG 3

Perspektivische Darstellung des Relais bei geöffnetem Schiebefenster

FIG 4

Perspektivische Darstellung des Relais bei geschlossenem Schiebefenster mit einer Plombierung

FIG 5

Prinzipdarstellung der Blockierung

The invention will be explained in more detail using an exemplary embodiment. The accompanying drawing of a thermal overload relay shows:

FIG. 1

Front of the relay

FIG 2

Cross section of the relay

FIG 3

Perspective view of the relay with the sliding window open

FIG 4

Perspective view of the relay with closed sliding window with a seal

FIG 5

Block diagram

The thermal overload relay Fig. 1-4 is divided into one Heating chamber 1, in which a bimetallic release 2 is used per phase and a part in which a trigger mechanism 3 located.

A detection element 4 in the heating chamber 1 takes the adjustment the bimetallic trigger 2 and thus excites the trigger mechanism 3 which, if necessary, i.e. depending on the settings the control and operating elements, switching operations by Auxiliary switches 5 executes the control circuits.

1 shows the control and operating elements on the front of the device: "Hand-off" 6, trigger mode 7, trigger current 8, test and Switch position indicator 9. There are also auxiliary switch terminals 10 and terminals 11 can be seen.

To especially the controls for trip mode 7 and trip current 8 against unauthorized and / or unintentional adjustment To protect, a sliding window 12 as in the end position 13 closed. The rotary knob for setting the Tripping current 8 and the test and switch position indicator 9 covered. The rotary button for setting the release mode 7 is shown in FIG 5 by adjacent surfaces of Sliding window 12 and a cam attachment 14 with a flat surface blocked on a shaft 20 of the rotary knob. This kind the blocking would also be due to a corresponding recess possible on the shaft; is breaking this blockage but already possible with a relatively small torque.

In the closed position 13 of the sliding window 12 according to FIG 4 can due to a fixed eyelet 15 on the front of the housing and an eyelet 16 carried through the sliding window 12, the opening of which then lie on top of one another, a seal 17 or closure.

The "hand-off" button 6 is also in the open end position 19 of the sliding window 12 according to FIG. 3 is not covered or blocked so that at any time what is important for emergency stop cases the main circuit can be interrupted.

Claims (2)

1. Electrical device with at least one control and/or operating element (6, 7, 8), which can be adjusted to affect at least one electrical quantity and/or at least one release mode, the control and/or operating element (6, 7, 8) being protected following an operationally required adjustment procedure by a blocking element (12) against a further unauthorised and/or unintentional adjustment, characterised in that the blocking element (12) is designed as an element which can be moved between two end positions, which in one of its end positions (19) releases the control and/or operating element for an adjustment and in its other end position (13) prevents the latter from being adjusted, the movable element being designed as a sliding window (12) and it being possible to lock and/or seal the blocking element (12) in its other end position (13) such that a manual off button (6) cannot be covered or blocked even in the open end position (19) of the slide window (12).
2. Electrical device according to Claim 1, characterised in that continuously adjustable control and/or operating elements (8) can be covered in the blocked position (13) and control and/or operating elements (7) adjustable in steps can be blocked.

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