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Патент USA US3031648

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April 24, 1962
Filed March l1, 1960
United States atentf Íice
Patented Apr. 24, 1962
is substantially of C shape. The center portion of the C
Joseph J. Bertram, Norwalk, and Jack E. Antes, Old
Greenwich, Conn., assignors to Bumdy Corporation, a
corporation of New York
Filed Mar. 11, 1960, Ser. No. 14,310 -
2 Claims. (Cl. 339-217)
This invention relates to electrical connectors, and
includes an inward-going surface 10a and a transition sur
face 10b. An inward-going dimple at the center of the
C might also be used.
Referring again to FIG. l, in assembly the contact
spring 9 is snapped into neck portion 6 so that inward~
going surface 10a projects through window 7 into bore 2.
Surface 10a will thus press the pin contact against the
socket wall when the pin is inserted into bore 2, and en
more particularly, to contact retaining means for con 10 sure good mechanical and electrical contact between the
pin and socket contacts. Transition surface 10b is adapted »
nector assemblies.
to guide the inserted pin under the inward-going surface
It is commonplace to manufacture connector assem
blies made up of a plurality of individual contacts. Of
late these contacts have Ábeen made individually insertable
and removable from the assembly; permitting the contact
to be first connected to a conductor and then inserted into
the housing of the connector assembly. Similarly the
contacts and their conductors may be removed from the
assembly and replaced. This individual contact assembly
feature generally requires a retention spring to lock the
10a. Spring detent 11 is snapped onto neck portion 8.
It will be noted that the neck portion 8 is of greater length
from shoulder 8a to 8b, than the included spring 11 from
edges 11a to 11b, and so spring 11 is adapted to cant on
the neck 8 until its edges 11a and 11b contact shoulders
8a and -Sb respectively. A conductor (not shown) is
inserted into b_ore 3 and secured therein by suitable
means, suchas crimping.
- f
Finally the connector is inserted into its mounting hole
contact in place. Unfortunately, these springs, if made
13, with bore 2 end leading. As spring 11 passes through
large and rugged, do not permit miniaturization of as
hole 13, it both cants on neck portion S and has its tab
sembly with the maximum number of contacts in the
12 depressed, the gap between the ends slightly increasing
smallest area; and if made small and fragile rapidly de
form, taking a permanent set, and fail after only a few 25 adjacent 11a and decreasing adjacent 1-1b. The depres
sion that tab 12 undergoes, however, is not as great as it
insertions and removals of the contact. Further, many
would be if the Whole spring 11 was not able to cant, and
of these springs permit the contact to be twisted out of
thus not exceed the elastic limit of the spring material.
its mounting hole, a rotational pull on the contact cam
ming the spring into depression.
Thus the residual set that the tab 12 develops as a result
It is, therefore, an object of this invention to provide 30 of its depression is not as great. When the connector is
pushed fully into hole 13, and ridge 5 abuts the shoulder
a Contact retention spring which will permit both minia
1‘4 of the mounting panel, tab 12 snaps up to at least a
turization of assembly and good interlocking, and yet al
height where its tip 12a is above the level of the hole 13.
` low for a multiplicity of insertion and removal operations
of individual contacts in a connector assembly.
If the contact is now pulled slightly, as by a strain on the
A feature of this invention is a retention spring having 35 conductor, tab tip 12a abuts the shoulder 15 of the mount
ing panel and the spring 11 is rocked back into place,
a single spring tab or linger and which is adapted to tilt
swinging tab tip 12a even' further above the hole. If the
or cant on its associated contact both during insertion of
stress is increased the tab tip v12a will expand in the hole
said contact, and when the contact is subject to an axial
13a increasing its locking power and removing any set
pull, either with or without concurrent rotation.
These and other objects and features of this invention 40 induced by its insertion through hole 13.
The contact is now held in hole 13 by ridge 5 and tab
will become more apparent by reference to the following
tip 12a. If the contact is twisted, the contact will rotate
description taken in conjunction with the accompanying
within both the hole 13 and spring 11. There is no tend-v
drawings, in which:
ency for the tab to be cammed back into hole 13 or to
FIG. 1A is a View in elevation of a contact having a
contact spring and a retention spring in accordance with 45 chew up the hole.
To remove the contact assembly from the mounting, an
the principles of this invention;
extraction tool is inserted into hole 13a to depress tab 12a,
FIG. lB is an end view of the contact of FIG. 1A;
permitting the convenient withdrawal of the contact from
FIG. 2A is a view in elevation of the retention spring
‘hole 13.
of FIG. lA;
FIG. 2B is an end View of the retention spring of 50" ` Although FIG. 1 illustrates a femal type contact, obvi
ously a male type contact may be similarly mounted.
FIG. 2A;
FIG. 3A is a view in elevation of the contact spring of
The invention has thus been described but it is desired
to Ibe understood that it is not confined to the particular
FIG. 1A; and
FIG. 3B is an end view of the contact spring of FIG. 3A.
forms or usages shown and described. The same being
Referring to FIGS. lA and 1B, reference character 1 55 merely illustrative, and that the invention may be carried
indicates generally a female or socket type contact having
out in other ways without departing from the spirit of the`
at one end a central bore 2 adapted to vreceive the pro
jection of a male or pin type contact, and at its other end
a central bore 3 adapted to receive a conductor. A peep
invention, and therefore, the right is broadly claimed to
employ all equivalent instrumentalities coming within the
scope of the appendent claims, and by means of which
hole 4 is provided to permit inspection of the extent of 60 objects of this invention are attained and new results ac
the insertion of the conductor into the bore. The con
complished, as it is obvious that the particularly embodi
tact also includes a ridge 5, a neck portion 6 having a
ments herein shown and described are only some of the
window 7 onto bore Z and a neck portion 8. Disposed
many that can be employed to obtain these objects and
on neck portion 6 is a substantially C-shaped spring 9
accomplish these results.
having central dimple 10. Dimple 10 projects through 65 We claim:
window 7 into bore 2. Disposed on neck portion 8 is a
1. A connector assembly comprising a dielectric hous~
retention spring 11 having a single upstanding tab 12.
ing, said housing including a mounting hole having a con
FIGS. 2A and 2B illustrate the retention spring 11,
striction of a given diameter; ametal contact having a
which is substantially of C shape. As shown in FIG. 2A,
the upstanding center portion or tab 12 of the retention 70 contact-insert-portion, of less than said given diameter for
insertion through said mounting-hole-constriction; said
spring 11 is not parallel to the central axis of the spring.
contactdnsert-portion including two shoulders and a sec
FIGS. 3A and 3B illustrate the contact spring 9, which
greater than said gi'ven size for preventing overinsertion
tion of reduced diameter therebetween; a retention spring
disposed substantially coaxíally- about said section ofre
v of said contact-insert-portion; and wherein the full inser
duced diameter between said shoulders, and having a
tion of said contact-insert-portion disposes said retention
length shorter than the distance'between said shoulders;_
a portion of said retention spring normally projecting
spring-projecting-portion axially beyond said mounting
hole constriction, whereby said retention-spring-projecting
portion in its returned-to-norrnal height prevents with
above the surface of said contact-insert-portion; the ar
drawal of said contact-insert-portion from said mounting
rangement being such that upon said contact-insert-portion
and said retention spring being inserted into said mounting
hole said retention spring and said mounting hole con
References Cited in the tile of this patent
striction having a mode of operation wherein the inner 10
surface of said constriction both depresses said retention
spring-projecting-portion and tilts said retention spring on
said reduced-diameter-section away from Aits coaxial rela
tionship with said'reduced-diameter~section, said retention
spring-projecting-portion returning to substantially its nor 15
mal height above the surface of said contact-insert-portion
upon said retention spring being passed through and be
yond- said mounting hole constriction.
2. A connector assembly according to claim l further
including:v a portion on said contact having a diameter of
Adams _______________ __ Allg. 2, 1949
Swanson et al.v ___. _____ __ Aug. 30, 1955
Switzerlandy ___________ __ Aug. 16, 1937
Great Britain _________ _n Sept. 13, 1945
France _______________ __ July 26, i943
France _______________ __ Jan. 13, 1955
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