Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Polarity-responsive
Reexamination Certificate
2000-05-11
2001-11-20
Barrera, Ray (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Polarity-responsive
C335S083000, C335S156000
Reexamination Certificate
active
06320486
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is directed to an electromagnetic relay having a coil, a yoke and an armature, at least one stationary and at least one movable contact actuatable by the armature, whereby a first contact is directly connected to a first terminal element and a second contact is connected to a second terminal element via two conductor sections bridged by a pluggable melt fuse, and whereby the terminal elements emerge toward the outside through a bottom side of the relay.
Such a relay is disclosed, for example, by DE 32 09 915 A1. This discloses a relay, particularly for motor vehicles, whereby additional contact lugs are conducted upward from the actual relay system within the housing and are bridged by a melt fuse arranged at the outside on the housing, and the terminal contacts of the lugs extend through a top-side housing opening into the inside of the housing. Accordingly, the relay therein must have a more or less central opening in the upper side of the housing, as a result whereof protecting the relay in the inside against environmental influences is deteriorated. Since, of course, the normal load circuit terminals are usually conducted to the bottom side and out therefrom in a downward direction, additional terminal lugs to the fuse lying at the upper side are also required. Finally, the fuse attached onto the housing also increases the structural height of the relay.
DE 37 08 723 A1 also discloses a relay having a structured standard for, in particular, motor vehicles, whereby a load circuit terminal is conducted over a yoke and over a terminal element of highly electrically conductive material connected to the yoke.
SUMMARY OF THE INVENTION
A goal of the present invention is to fashion a relay design of the species initially cited such that a standardized relay design having optimally few changes and optimally few auxiliary parts is equipped for the acceptance of a melt fuse. The protective effect of a housing cap should thus be largely retained insofar as possible and the structural height should also not be increased.
In such a relay, this goal is inventively achieved in that the second contact is connected to the yoke, which comprises a yoke section extending perpendicular to the bottom side in the region of an outside of the relay, in that the second terminal element extends through the bottom side in the extension of the yoke section, electrically insulated therefrom, in that both the yoke section as well as the second terminal element each respectively carries a spring clip laterally projecting from the outside, and that the two spring clips aligned with one another at a predetermined distance for accepting the fuse element.
Given the inventive relay, thus, the plug fuse is located in the region of a sidewall of the relay, whereby the spring clips to be connected to the fuse are conducted out of the housing. This preferably occurs in the proximity of the bottom side of the relay, so that the housing cap, with its protective effect, is largely preserved and need only comprise slight clearances in the region close to the bottom side.
The spring clips are respectively preferably connected to the yoke leg or, respectively, to the terminal element via webs, namely at sections via which the load current is already conducted toward the outside given standard structures. Compared to the standard structures, thus, the yoke leg and the second terminal element can remain essentially unmodified, whereby it is merely the usual, direct connection between yoke leg and terminal element that is parted in order to enable the bridging by the plug fuse. The webs serving the purpose of connection can, for example, be fashioned of one piece with the respective yoke leg or, respectively, the terminal element or can also be subsequently connected thereto, for example by welding or soldering. The spring clips, which directly accept the plug blades of the plug fuse, can be fashioned of one piece with the webs or can be subsequently connected thereto by welding, soldering or riveting.
As already mentioned, a housing cap of the relay can largely retain its standard form when it is merely provided with appropriate recesses for said webs. It then has one of its sidewalls engaging between the actual relay and the plug fuse with the spring clamps. However, it is also advantageous to apply an additional pocket to the cap that at least partially surrounds the plug fuse with the terminal posts. It is thereby in turn advantageous when this pocket is open toward the upper side in order to enable the replacement of the plug fuse without removing the relay housing cap.
The invention is explained in greater detail below with reference to exemplary embodiments on the basis of the drawing.
REFERENCES:
patent: 4460239 (1984-07-01), Inoue
patent: 5132653 (1992-07-01), Nakatake et al.
patent: 32 09 915 A1 (1983-09-01), None
patent: 37 08 723 A1 (1988-09-01), None
Dietrich Roman
Ritter Peter
Barrera Ray
Schiff & Hardin & Waite
Tyco Electronics Logistics AG
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