Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Plural independently operable switches
Patent
1994-01-10
1995-01-17
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Plural independently operable switches
335256, 335 78, H01H 900
Patent
active
053829344
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an electromagnetic changeover relay which has two coils, which can be driven separately, on an insulating base body, for changing over at least one contact unit. The invention preferably relates to a pole-reversal relay for driving electrical drives having a reversible rotation direction, for example DC motors for clockwise and anticlockwise running, as are used in motor vehicles.
2. Description of the Prior Art
A pole-reversal relay, in addition to the use of two separate relays, is already known (DE 38 43 359 C2) for the said application, in the case of changeover relay, two complete relay blocks are arranged with point symmetry on a common base body. The contact elements which belong to the respective relay blocks and are operated by the two armatures are located between the relay blocks and are allocated to both systems, at least partially via fixed connections. Since this known system in each case has a dedicated coil former, a dedicated yoke and a dedicated armature for each of the two relay blocks, which are all accommodated on the base body, this results in a correspondingly high component cost which in turn results not only in an increased production and assembly cost but also an increased volume of the relay system.
In addition, a polarized miniature relay having two series-connected windings is also already known from DE 31 24 412 C1, in the case of such a miniature relay, a single armature is arranged and can be changed over in the center between two coil cores. Apart from the fact that this relay requires a permanent-magnet system, it is unsuitable for the abovementioned applications since the armature, which itself is used as the contact element, can neither switch large currents nor permits the number of contact combinations which are required, for example, for motor pole reversal.
A switching relay for transmission technology and electronics is known from DE-B-1,036,914. In such a case a switching relay, two magnet coils, which are aligned with their core axes with respect to one another, are arranged on a base plate and between whose mutually facing inner core ends an armature can be changed over. However, in this case, this armature is supported a long distance outside the coil region and carries contact elements on the ends facing away from the coils. In addition, the armature operates further contact springs, which are arranged outside the coil region, via a lever device. The entire construction of the relay described in this case is, however, very complicated and voluminous for present conditions, so that this design is not suitable for use in a motor vehicle.
SUMMARY OF THE INVENTION
It is an object of the invention to create an electromagnetic changeover relay which can preferably be used as a pole-reversal relay and permits a compact construction with a small number of simple parts.
According to the invention, this aim is achieved with a relay which has the following features: are displaced on the base body. The winding and core are aligned essentially axially with respect to one another, forming an air gap between the mutually facing inner core ends; is supported on a central region of the yoke; and coil and mounted in the vicinity of the armature supporting point, and whose free, contact-making ends can each be changed over, by the armature or one of the armatures, between a quiescent position and an operating position; and base body and each make contact with at least one contact spring in at least one of their switching positions.
The relay according to the invention thus has only a single yoke which connects the outer eDds of the coil cores and it also requires--in the case of a preferred embodiment--only a single armature which can be changed over between the inner core ends. This armature operates contact springs which are displaced in the region between the armature and core, overlapping of the contact springs with the respective coil core being prevented, of course, by suitable design of the
REFERENCES:
patent: 2108775 (1938-02-01), Macgeorge
patent: 4529953 (1985-07-01), Myers
patent: 4959627 (1990-09-01), Iizumi et al.
Hendel Horst
Kern Josef
Kleine-Onnebrink Bernhard
Donovan Lincoln
Siemens Aktiengesellschaft
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