Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1992-05-06
1993-10-05
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
335 78, H01H 5122
Patent
active
052509192
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an electromagnetic relay having a cap-shaped housing open towards the terminal end of the relay, a magnet system with coil and armature arranged in the upper, closed zone of the housing, and a contact system which is arranged in the lower, open zone of the housing and has in a carrier of insulating material at least one moveable contact element that is operationally connected to the armature via an actuator, the carrier at least partly closing the open side of the housing from below. Moreover, the invention relates to a process for assembling such a relay.
2. Description of the Related Art
In known relays of this type, the magnet system and contact system are as a rule mutually assigned at a fixed spacing. In Germal Utility Model 85 24 259-U1, for example, the magnet system is rigidly connected via its yoke to a U-shaped body of the contact system, so that the design also fixes the positions and mutual spacings of the armature and the moveable contact elements. Manufacturing tolerances of the individual parts must thus be compensated after the connection of the magnet system and the contact system by appropriate adjustment of the contact elements and of the armature, respectively. Not until then is the entire relay system inserted into the housing cap.
In another known relay, which is described in Germal published Application 2,622,133, the magnet system is in fact glued fast to the inside of a cap-shaped housing part. However, in this case, as well, the contact system is rigidly coupled with spacings to the magnet system, since it is directly mounted via blocks of insulating material on the magnet system, that is to say the yoke. In this case, as well, special adjustment of the contacts is therefore necessary before assembly.
SUMMARY OF THE INVENTION
It is the object of invention to provide a relay having the structure mentioned at the beginning in which manufacturing tolerances can already be taken into account by the assembly of the relay, that is to say adjustment is not required as a special work operation.
According to the invention, this aim is achieved in such a relay when each moveable contact element extends essentially parallel to the terminal plane and is actuatable in a direction perpendicular thereto, the magnet system is anchored directly in the housing, and the carrier of the contact system is guided in a guideway of the housing parallel to the actuating direction without a stop and connected to the housing in a freely settable insertion position.
In the relay according to the invention the magnet system and the contact system are not mutually fixed by design and thus affected by tolerances, but the magnet system is merely rigidly anchored in the housing, while the contact system is brought to the desired spacing by the guideway in the housing while assembly is still going on, and is mounted at a position that is not strictly prescribed. Consequently, manufacturing tolerances can be eliminated during assembly. The mounting is performed, for example, by a clamped or glued joint, by ultrasonic welding, or in some other way. It is important, in any event, that the joint is not made at a strictly prescribed stop in the actuating direction.
In an advantageous embodiment, the carrier of the contact system has an essentially plate-shaped base part with a circumferential guide edge and a mounting block, integrally formed in one piece on the base part, for contact springs that can be plugged laterally into receptor slots. Moreover, towards the magnet system the carrier can have an insulating lid part integrally formed in one piece which shields the contact elements with the exception of a penetration point for the actuator. However, the invention can also be applied to a contact system in which the contact elements are embedded in the carrier or are inserted in another way.
In a process according to the invention for assembling the described relay, the magnet system is firstly anchored, for example, glued, in the body
REFERENCES:
patent: 4949058 (1990-08-01), Nishikawa et al.
patent: 5084688 (1992-01-01), Martino
Donovan Lincoln
Siemens Aktiengesellschaft
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