DE8800701U1 - Command switch - Google Patents

Description

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6 3 O 1 2 EN

\ 1 Siemens AG
Command switch

The invention relates to a command switch with a key rosette and at least one switch insert, whereby the key for operating the switch insert can be turned from an off to an on position and can be removed in the off position.

In a known control switch of the type mentioned above (DE-AS 21 37 690), the key can be removed in the off position, ie anyone can remove the key without being noticed, so that unauthorized persons can gain possession of the key and carry out safety operations intended only for qualified personnel. Fully automatic assembly and production facilities are protected by protective covers during automatic operation. For setup operation or when rectifying a fault, the safety circuit must be able to be bridged using a key switch so that the cover can be opened. Subsequent automatic operation should only be resumed with the cover closed when the bridge is removed and the key is removed.

The innovation is therefore based on the task of improving the command switch of the above-mentioned type in such a way that it is ensured that the key is also fully removed when the bridging is removed. This is achieved in a simple way by allowing a further switch insert to be operated depending on the key insertion. In order to also ensure that the key is not pushed out of the switch by a return spring after it has been turned to the off position and released, it is advantageous if a plunger extension for the plunger of the further switch insert is placed on the tip of the key and the springs of the tumblers

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/ 1 for the key are so strong that the key remains in the inserted position when the switch insert is actuated without the effect of additional forces. In order to be able to solve both locking and display tasks with the new command switch, it is advantageous if the additional switch insert has an opening and closing contact opening. The switch inserts can be easily attached to the rosette if the plunger extension in the key rosette is guided in a spring-loaded manner towards the tip of the key. If several switching tasks are to be fulfilled with the command switch, it is also advantageous if the additional switch insert is arranged centrally between two switch inserts, the plungers of which are

C I By turning the key in opposite directions, the feed cams which are alternately activated can be operated.

The drawing describes an embodiment according to the innovation.

Show it:

FIG 1 is a front view, partly in section, of a

a key rosette attached to a mounting wall with attached switch inserts and
FIG 2 shows the side view.
25

, The command switch shown in the drawing consists of the key rosette 1 and the switch inserts 2, 3 and 4, which are snapped into the holding frame 5. The holding frame 5 is connected to the key rosette in a bayonet-like manner and is clamped to the mounting wall 7 for the command switch via screws 6. A key 8 is inserted into the key rosette. The tumblers 9 for the key 8 are spring-loaded in the direction of the key via springs 10. An extension plunger 12 is operatively connected to the tip 11 of the key 8, which interacts on the other side with the actuating plunger 13 of the switch insert 3. A back pressure

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( 1 spring 14 for the extension plunger 12 rests on one side on a collar 15 of the extension plunger and on the other side on parts of the key rosette 1 that are fixed to the housing. The extension plunger 12 is guided in the middle of the key rosette so that it can be moved. When the key 8 is removed, the extension plunger is moved in the direction of removal by the springs 14. This also releases the actuating plunger 13 so that the fixed contact parts 16 shown in Fig. 1 are bridged by the contact bridge 17 , i.e. the contact is closed. In the switch insert 3, an additional contact can be provided which is closed when the key 8 is inserted, which can be used to indicate the inserted position of the key. When the key 8 is inserted, a feed cam 18 or 19 can be actuated by turning the key either to the left or to the right, which is connected to the The actuating plungers of the switching inserts 2 and 4 come into active connection alternately, so that the desired switching operations can be carried out in accordance with the safety regulations. The corresponding design of the springs 10 ensures that the key 8 remains in the position shown in the drawing, ie the return spring 14 for the extension plunger 12 and also the return spring 20 for the switching insert 3 are not able to push out the key 8. The key 8 must therefore be deliberately pulled out, whereby the switching operation of the switching insert 3 is initiated.

Claims (5)

6 3 O 1 2 OE Protection claims 1. Command switch with a key rosette and at least one switching insert, whereby the key for actuating the switching insert can be rotated from an off to an on position and can be removed in the off position, characterized in that a further switching insert (3) can be actuated depending on the key insertion. 2. Command switch according to claim 1, characterized in that a plunger extension (12) for the plunger (13) of the further switching insert (3) rests on the key tip (11) and the springs (10) of the j) tumblers (9) for the key (8) are designed to be so strong that the key (8) remains in the inserted position when the switching insert (3) is actuated without the action of additional forces. 3. Command switch according to claim 1 or 2, characterized characterized in that the further switching insert (3) has an opener and a closer contact arrangement. 4. Command switch according to claim 2 or 3, characterized in that the plunger extension (12) in the key rosette (1; towards the key tip (11) spring-loaded (14) is guided displaceably. ) 5. Command switch according to claim 4, characterized in that the further switching insert (3) is arranged centrally between two switching inserts (2, 4), the plungers of which can be actuated by pre-cut cams (18, 19) which become alternately effective when the key (8) is turned in opposite directions. * * tt «I Il Mil Il &bull; * * k * * &igr;&igr;&igr; * &bull; * · &bgr;« Il &diams; * · C ·« * &diams;&agr; · &diams; · &mgr;