Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Polarity-responsive
Patent
1994-01-10
1995-02-28
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Polarity-responsive
335 80, 335128, H01H 5122
Patent
active
053941276
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an electromagnetic relay having a base body, at least one carrier pin which is anchored in a wall of the basic body and which emerges perpendicularly from the wall, and at least one contact spring which is of a strip shaped material, which is partly wrapped around the carrier pin and secured on it by means of a securing section, and which has a contacting spring shank which can be switched over by an armature about the axis of the terminal post between a resting position and a working position.
2. Description of the Related Art
Relays in which contact springs made from strip shaped material are secured in this way are well known, the terminal post generally being anchored in a base section or in another base body part. In relays of a conventional type, in which the contact springs are in each case partly wound around the terminal post by means of a securing end, as is disclosed, for example, in German Application 2,512,574, the contact spring must in any case additionally be secured on the terminal post by welding or in some other way, in order to prevent twisting of the contact spring during switching. This means that even after being fitted on the terminal post the securing end of the contact spring must be accessible for welding or for another type of securings if, however, the contact spring in a relay is arranged in a restricted space, for example between the armature and coil, the type of securing mentioned at the beginning is not possible. Furthermore, during welding of a strip spring on a pin a specific prestressing can be achieved only by special measures or by subsequent adjustment.
SUMMARY OF THE INVENTION
It is the object of the invention to provide contact springs and to secure the contact springs in a relay of the type mentioned at the beginning in such a way that the spring can easily be fitted on the pin even in the case of restricted conditions of space, and that the shaping of the spring itself is enough in conjunction with the overall structure of the relay to be able to achieve a desired prestressing which renders adjustment after fitting superfluous.
According to the invention, this and other objects is achieved when the base body is firmly joined to a coil former in front of one end face of which an armature of flat design is arranged, in that, furthermore, the carrier pin is arranged with the contact spring in the region between the armature and the coil former, in that the contact spring forms with its securing section a clamp sleeve which is plugged onto the carrier pin in a force-closed fashion, and has beyond the clamp sleeve a pre-stressing shank in the form of a continuation which is supported on the coil former and prestresses the spring shank into its rest position using via the carrier pin as a lever axis.
An arrangement of contact springs in the region between the armature and winding has already fundamentally been disclosed by German Application 3,545,356. There, however, the contact springs are anchored on the coil flange itself in plug-in slots; moreover, the contact springs there are constructed as bridge contacts without their own terminal components.
Furthermore, French Application 1,532,608 has also already disclosed a contact spring which is plugged onto a carrier pin with the aid of a clamp sleeve and is supported on a fixed contact with the aid of a second contact shank. However, it is a question there not of a relay but of a portable luminaire in which the contact spring is operated via different cam faces of a rotary button switch. Due to the shape and of the contact spring and the way in which it is secured, according to the invention, it is possible to set the desired prestressing for the contact shank via the angle between contact shank and prestressing shank in cooperation with the position of the supporting component of the coil former with respect to the carrier pin; the prestressing arises automatically as a result of the fitting of the preformed contact spring in the relay
REFERENCES:
patent: 3152237 (1964-10-01), Richert
patent: 3165607 (1965-01-01), Hogan
patent: 3519966 (1970-07-01), Sprando et al.
patent: 3958200 (1976-05-01), Mally
patent: 4053858 (1977-10-01), Aidn et al
patent: 4554521 (1985-11-01), Hurter
Donovan Lincoln
Siemens Aktiengesellschaft
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