EP0896729B1 - Auxiliary switch block - Google Patents

Description

The invention relates to an auxiliary switch attachment block for plugging onto a basic device, in particular a Contactor with a coupling point on its plug-in side (4) (5) for engagement with a contact carrier of the basic device and which has two rows of superimposed windows, of which in the company, depending on the training as opening or closing function, only in the upper one or lower window, a switching piece is added, wherein the height of the contact piece carrier essentially the height of the Window pairs corresponds.

A generic auxiliary switch attachment block is on the Electronics market available. Such auxiliary switch top blocks as well as the basic devices are with NC and NO contacts Mistake.

A flawless opening and closing function sets one Forced operation from the auxiliary switch top block to the basic device ahead. This is guaranteed if a NC contact in the auxiliary switch attachment block another air gap of at least 0.5 mm on the NO contacts of the Basic device is present.

Compliance with the priority control within a device, i.e. within an auxiliary switch attachment block or a basic device is usually not a problem. If that Basic device and the auxiliary switch top block in one Housing can be accommodated here Coupling tolerances eliminated and positive guidance also be ensured here. However, the forced control will difficult if an auxiliary switch attachment block is added later is plugged onto a basic device, as shown in FIG. 2 is shown. The difficulty of the forced guidance results differs in that the contact piece carrier only by relatively closely adjacent support points in the area of the switching chamber is performed (see FIG 3), which is a corresponding pronounced inclination of the contact piece carrier can result. This tilt position can be on the coupled Contact bridge carrier of the basic unit and transferred when welding an NC contact together with the coupling tolerances of the auxiliary switch attachment block to the basic device an insufficiently large air gap at one of the NO contacts have as a consequence.

EP 0 045 683 A1 discloses a couplable to a contactor single-pole auxiliary switch. The elongated one here Contact carrier of the auxiliary switch carries only one Switch piece and is guided in a switching chamber. The leadership of the contact bridge carrier has exclusively here the movement of contacts between open and Closed position to the goal. Because of the single pole design However, additional forced control, such as that for several adjacent contact pieces under unfavorable Ratios needed, not required.

The invention is therefore based on the object of an auxiliary switch attachment block of the above type improve that the required positive guidance is achieved becomes.

The object is achieved in that on the Contact piece carrier opposite the coupling point its height beyond an extension is present, which in one region of the switching chamber projecting beyond the contact piece carrier reaches into and with guide means of the switching chamber in this area is engaged.

FIG 1

einen Schaltstückträger eines Hilfsschalteraufsatzblocks,

FIG 2

einen Schaltstückträger nach dem Stand der Technik und

FIG 3

eine perspektivische Ansicht einer Schaltkammer.

An embodiment of the invention is explained below with reference to a drawing. Show it:

FIG. 1

a contact piece carrier of an auxiliary switch attachment block,

FIG 2

a contact piece carrier according to the prior art and

FIG 3

a perspective view of a switching chamber.

In FIG 1, a contact piece carrier 2 is not for one here auxiliary switch top block shown with lower support points 9 shown. The on the plug-on side 4 of the contact piece carrier 2 lying coupling point 5 is used for engagement with a contact carrier of a basic device, not shown here. The contact piece carrier 2 points upwards in FIG. 1 an elongated extension 3, which according to FIG 3 in a Area 6 of the switching chamber 7 extends there with a Groove 8 is engaged as a guide means. Serve as a support So the support points 9 on the slip side 4 of the Contact piece carrier 2 and the groove 8. The two supports are 1 at a distance L2 from each other. This compared to the solution according to the prior art (see FIG 2), where the distance L1 of the pads is much smaller is a reduced skew according to the Dimension X2 in comparison to the previous dimension X1. The measure for the inclination X2 is inversely proportional to the distance L2 of the lower support point 9 from the upper request point in the groove 8. This reduces the inclination enables compliance with the priority control due to the entrance described interaction of the contact piece carrier 2 the switching chamber 2 with the contact carrier of the basic device.

Claims (2)

1. Auxiliary switch block for attachment to a basic device, in particular a contactor, having a contact carrier (2) which is guided in an interrupter chamber (7) of the auxiliary switch block, has, on the side (4) by which it is attached, a coupling point (5) to engage with a contact carrier of the basic device, and has two rows of windows which are located one above another and each of which, in operation, is occupied by a contact piece only in the upper or lower window, depending on the design as a normally-closed or normally-open function, the height of the contact carrier (2) essentially corresponding to the height of the pairs of windows, characterized in that the contact carrier (2) is provided, opposite the coupling point (5), with an extension (3) which extends over the entire height of said carrier, reaches into a region (6) of the interrupter chamber (7) projecting beyond the contact carrier (2) and engages with guide means (8) of the interrupter chamber (7) in this region (6).
2. Auxiliary switch block (1) according to Claim 1, characterized in that the guide means provided is a groove (8) in the interrupter chamber (7).

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