Electrical connectors – Metallic connector or contact having movable or resilient... – Spring actuated or resilient securing part
Patent
1986-05-02
1986-06-02
Weidenfeld, Gil
Electrical connectors
Metallic connector or contact having movable or resilient...
Spring actuated or resilient securing part
H01R 1312
Patent
active
046698086
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an electrical receptacle for mating with a male electrical element, especially, but not exclusively, with a ceramic chip resistor.
A ceramic chip resistor, comprises an elongate rectangular ceramic wafer upon which has been formed a resistive tile connected at each of two opposite ends thereof to a metallic contact pad on a respective end of the wafer. Where, as will usually be the case, the wafer has been severed from a ceramic strip, the ends of the wafer are rectangular, that is to say they are unchamfered.
It is desirable that a receptacle for mating with such a resistor should be arranged to assist in dissipating heat generated by current flowing through the resistive tile when the resistor is in use, and that the receptacle should be suitable for accepting a rectangular wafer end.
In practice, a ceramic chip resistor is supported on a printed circuit panel or other substrate, by means of a pair of receptacles each of which has previously been mated with a respective end of the wafer.
There is disclosed in Japanese Utility Model Publication No. 57-50979 an electrical receptacle for mating with a male electrical element, comprises first and second superposed plates cooperating to define a flared mouth and a passage communicating with the mouth, the plates being joined together by resilient bights on opposite sides of the mouth.
This receptacle mates with a tab having a chamfered leading end.
According to the present invention, the first plate is connected to the bights at positions spaced back from the mouth, and thus projects freely between the bights so as to be tiltable about its connections therewith by a male electrical element inserted into the passage by way of the mouth, to cause the male element to be gripped between the plates at least in the vicinity of the mouth and at a position remote therefrom, when the leading end of the male element has reached a predetermined position beyond said connections.
By virtue of the invention the force required to mate the male element with the receptacle, is initially low and the contact pressure exerted by the plates against the fully inserted male element is desirably high. Where the male element is a ceramic chip resistor, the tendency of the rectangular end of the wafer to inhibit the insertion of the male element and to damage the contact surfaces of the receptacle is thereby reduced, and the resistive tile will be firmly engaged when the resistor has been fully inserted into the passage so that the receptacle assists in the dissipation of heat generated by current flowing through the tile when the resistor is in use.
The contact pressure can readily be controlled by suitably choosing the dimensions and the spring characteristics of the bights.
The insertion depth of the male element can be predetermined by providing a stop projecting into the passageway and which may be in the form of a tongue struck out from one of the plates.
High pressure point or line contact between the plates and the male element, may be achieved by dimpling a plate in the vicinity of its tilting axis so as slightly to constrict the passage.
One of the plates may be extended to provide an anchoring portion, for example, in the form of a sprague nut, for securing the receptacle to a printed circuit board or other subtrate when the resistor has been mated with the receptacle.
For a better understanding of the invention, reference will now be made by way of example to the accompanying drawings in which:
FIG. 1 is a top perspective view of an electrical receptacle showing a male electrical element in the form of a ceramic chip resistor (only one end portion of which is shown) positioned for mating with the receptacle;
FIG. 1A is a side view of the receptacle;
FIG. 2 is a view taken on the lines 2--2 of FIG. 1;
FIG. 3 is a similar view to that of FIG. 2, but showing the male element mated with the receptacle;
FIG. 4 is a similar view to that of FIG. 2, but illustrating a modification of the receptacle shown in FIGS. 1 to 3; and
FIG. 5 is a similar view to th
REFERENCES:
patent: 3192498 (1965-06-01), Ruehlemann
patent: 3992076 (1976-11-01), Gluntz
patent: 4076369 (1978-02-01), Ostapovitch
patent: 4453799 (1984-06-01), Inoue
patent: 4472017 (1984-09-01), Sian
AMP Incorporated
Terrell T. G.
Webb Glenn L.
Weidenfeld Gil
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