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Патент USA US3033957

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May 8, 1962
I
K. s. JOHNSON
3,033,947
IGNITION CONTACT SET
Filed Dec. 30, 1958
FIG.3.
54 5°
58 52
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44
iINVENTOR.
United States Patent 0
1
we
1
3,033,947
2
3,033,947
.
IGNITION CONTACT SET
.
Kaliu S. Johnson, Northville, Mich., assignor to Holley
Carburetor Company, Van Dyke, Mic-in, a corpora
tion of Michigan
7
Patented May 8, 1962.
‘
Filed Dec. 30, 1958, Ser. No. 783,983
9 Claims. 7 (Cl. 200-30)
Inasmuch as the opening 36 from which the pivot post
is struck out tends to reduce rigidity of the contact bracket,
an edge portion thereof is bent upwardly to form a sti?en
ing rib or ?ange 38. An intermediate portion of the flange
extends further upwardly to provide the mounting bracket
16 previously referred to.
As best seen in FIGURE 4 the post 16 has an enlarged
square opening 40. At the opposite edge of the base
' The present invention relates to an ignition contact set.
' It is an object of the present invention to provide an 10 portion 34 of the bracket there is an upwardly bent por
tinon providing the contact post 114. In order to rein
ignition contact'set having a rigid contact bracket of
novel design formed from a single piece of metal and in
cluding as an integral portion thereof a pivot post.
It is a further object of the present invention to pro
force the contact post 14 the portion of the bracket at
the junction between the lower end of the contact post 14
and the base portion 34 of the bracket is indented inwardly
as indicated at 42.
vide an ignition contact set including a bracket having a 15
In the base portion 34 of the bracket and closely
post thereon, a breaker arm pivoted to said post, and
adjacent to the pivot post 12, a portion of the bracket
means disposed between said breaker arm and pivot post
is extruded downwardly to provide a locating pin or but
effective to eliminate clearance therebetween.
ton 44 adapted to be received in a recess 46' in a plate
More speci?cally, it is a feature of the present invention
to provide a torsion bushing between a breaker arm and 20 48 on which the ignition contact set is mounted.
In order to provide a suitable support for the breaker
pivot post to provide means permitting swinging move
arm 13 which permits its swinging movement about the
ment of the breaker arm and also to exert a dampening
vertical axis of the pivot post 12, a torsion bushing 50
effect which inhibits contact bounce.
is provided. The bushing 50 has a central opening shaped
‘, It is a further object of the present invention, in an
to
receive the pivot post 12 and has its external surface
ignition contact set, to provide a bracket including an 25
integral extruded locating pin thereon separate from the
pivot post.
-
More speci?cally, it is a feature of the present inven
of generally cylindrical con?guration. The bushing is
formed of a readily yieldable material such for example
as rubber.
The breaker arm 18 terminates at one end
in relatively large apertured ears 52 separated by a spacer
sleeve 54 surrounding the rubber bushing 50. The assem
portion thereof struck out and bent to form a pivot post 30 bly
may be completed by a pair of ?anged tubular mem- ‘
' tion to provide an ignition contact set bracket having a
of non-circular cross-section, andvan additional portion
thereof extruded out of the plane of the bracket to pro
vide a locating pin.
'
7
hers 56 pressed into the sleeve and having ?ange portions
58 overlying the ears 52 of the breaker arm.
‘ Intermediate its ends the breaker arm has a rubbing
Other objects and features of the invention will be
60 formed of a hard molded ?ber material riveted
come apparent as the description proceeds, especially when 35 block
as indicated at 62 to the intermediate portion of the
taken in conjunction with the accompanying drawings,
breaker arm. One end 64 of the spring 20 extends
illustrating preferred embodiments of the invention,
wherein:
FIGURE 1 is a plan view of the ignition contact set.
FIGURE 2 is a side elevational view of the set with
parts in section.
FIGURE 3 is a fragmentary sectional view on the line
around the sleeve 56 and engages a side of the breaker
arm as best illustrated in FIGURE 1. The breaker arm
is formed of very light gauge metal and includes a
doubled stiffening rib‘ 66 extending longitudinally thereof.
At its free end the breaker arm has a contact or breaker
point 68 attached thereto movable in and out of con
tact with a similar contact or breaker point 70 mounted
FIGURE 4 is a side elevation of the contact bracket.
on the contact post 14.
FIGURE 5 is a plan view of the contact bracket.
45
It will ‘be observed that the use of the torsion bushing
FIGURE 6 is a sectional view on the line 6—6, FIG
formed of rubber or equivalent material provides an ade~
URE 5.
3—-3, FIGURE 1.
The contact set shown in assembly in FIGURE 2 com
quate mounting for the breaker arm without the necessity
of providing cylindrical bearing portions. Not only does
prises a contact bracket 10 having a pivot post 12, a
it eliminate the necessity of bearings, but the torsion
contact post 14, and a mounting post 16. Connected to 60 bushing serves an important additional function in pro
the pivot post for rocking movement about its longi
viding a dampening eifect which substantially: reduces
tudinal axis is abreaker arm assembly indicated generally
any tendency for contact bounce.
1
at 18. Connected to the breaker arm assembly for biasing
In accordance with the present invention the single
it in circuit closing relation is a leaf spring 20. The leaf
contact bracket is shaped to have integrally formed there
spring '20 may constitute a current carrying element or if 55 'from the pivot post as well as the locating pin or
desired there may be an additional current carrying strip
button, which in prior constructions have been in the
22 connected, as will subsequently be described. The
form of one or more separate elements._ This is ac
leaf spring 20 and the current carrying strip 22 (if em~
complished without sacri?cing any advantages of prior
ployed) are connected to the mounting post ‘16 by a bolt
contact brackets, and in fact the present contact bracket
24, nut 26, conducting washers 28 and 30. The post 16 60 is stiffer and more rugged than prior contact brackets
is insulated from the spring 20 and strip 22 by a sheet
due to the provision of the bent up reinforcing rib or
32 of insulating material doubled over the post. It‘ of
flange 38.
'
’
course will be understood that the opening through the
The drawings and the foregoing speci?cation constitute
post 16 through which the bolt 24 passes is large enough
a description of the improved ignition contact set in such
so that the bolt does not contact the sides of the post.
65 full, clear, concise and exact terms as to enable any
In accordance with the present invention, and as best
person skilled in the art to practice the invention, the
illustrated in FIGURES 4-6, the contact bracket com
scope of which is indicated by the appended claims.
prises a ilat base portion 34 having an elongated portion
What I claim as my invention is:
~
struck out to provide an elongated opening 36, the struck
' 1. An ignition contact set comprising a bracket having
.out portion being bent to extend upwardly as shown in 70 an elongated sheet metal member having a ?at base and
FIGURE 4 to form the pivot postx12. The pivot post,
an elongated pivot post struck out from said base and
as best'seen in FIGURE 5, is of rectangular cross-section.
extending transversely from said base leaving an elongated
3,033,947
3%
4%
arm having one end secured to the outer surface of said
torsion ‘bushing, a contact on the ‘other end of said arm
movable into and out of engagement with said ?xed con
tact, and a leaf spring connected between said arm and
bracket and effective totbias said arm in a direction to
opening in said base, said pivot post being of non~circu~
lar' cross‘ section, a nonarotatable' torsionbushing ‘formed
of yieldable material mounted on said post, said torsion
bushing having an opening therethrough which has sub‘
stantially the same cross section as said pivot ‘post so as
to tightly engage the periphery of said post, and a breaker
close said contacts, said arm being swingable about said
arm’ connected to the- outer surface of said torsion bush
pivot post upon torsion of said bushing.
7. An ignition contact set comprising a bracket com
ing and‘ swin'gable about said pivot post upon torsion of
prising an elongated sheet metal member having a ?at
'
2. An ignition contact set comprising a bracket having 10 base, an elongated ‘pivot poststruck out from said base
and extending transversely-from said base =leaving an
an integrally‘formed pivot post thereon, said pivot post
said bushing.
elongated opening in said base, said pivot post being .of
being of 'non-circular cross section, a non-rotatable
non-circular cross section, an elongated stiffening and
reinforcing ?ange bent up at one edge of said base oppo
through which has substantially the same cross section 15 site the opening, a ?xed contact on said bracket spaced
from said post, a non-rotatable torsion’ bushing formed
as; said pivot post so as to tightlyengage the periphery
of yieldable matenial‘ mounted on said post, said torsion
oflsaidjpost, and a- breaker arm having one end secured
bushing having an opening therethrough which has sub
to the outer surface of said torsion bushing and swingable
stantially the same cross section as said pivot post so as
about said pivot post upon torsion of said bushing.
'3. An ignition contactset comprising a bracket having 20 to tightly engage the periphery of said post, a breaker
torsion bushing formed of yieldable'material mounted on
said post, said torsion bushing having an opening there
arm having one end secured to the outer surface of said
torsion bushing, a contact on the other end. of said arm
movable into and out of engagement with said ?xed con
tact, and a leaf spring connected between said arm and
an integrally formed pivot post thereon, said pivot post
being of non-circular cross section, a non-rotatable
torsion bushing formed of yieldable material mounted
on said post, said torsion bushing having an opening
therethrough which has substantially the same cross sec
tion as said pivot post so as to tightly engage the pe
riphery of said post, a breaker arm having one end se
bracket and effective to bias said arm ina direction to
close said contacts, said arm being swingable about said
cured to the outer surface of said torsion bushing, and
a spring connected to said arm, said arm being swing
as an integral part thereof a‘ downwardly extruded lo
able about said pivot post upon torsion of said bushing.
4. An ignition contact set comprising a bracket having
an integrally formed pivot post thereon, said pivot post
pivot post upon torsion of said bushing, said base having
30
cating button which projects below the lower surface of
said base.
'
8. An ignition contact set comprising a bracket com
prising an elongated sheet metal member having a ?at
base,i an elongated pivot post‘ struck out from said base,
torsion bushing formed of yieldable material mounted 35 and extending transversely from said-base leaving an
‘elongated opening in said base, said pivot post being of V
on said post, said torsion bushing having an opening
non-circular cross—secti0n, an elongated stiffening and
therethrough which has substantially thesame cross sec
reinforcing ?ange'bent up at one edge of said base oppo
tion as said pivot post so as to tightly engage the pe
being-of non-circular cross section, a ?xed contact on
said bracket spaced from said post, a non-rotatable
site the opening, a ?xed contact on said bracket spaced
riphery of said post, a breaker arm having one end se
from
said post, a non-rotatable torsion bushing formed
40
cured to the outer surface of said torsion bushing, and
of yieldable material mounted on said post, said torsion
a contact on the other end of said arm movable into
bushing having an opening therethrough which has sub
andout of engagement with said ?xed contact, said arm
stantially the same cross section as said pivot post so as
being swingable about said pivot post upon torsion of
to tightly engage the periphery of said post, a breaker
said bushing.
45 arm having one end secured to the outer surface of said
5. An ignition contact set comprising a bracket having
torsion bushing, a laterally extending projection on said
‘ an integrally formed pivot post thereon, said pivot post
being of non-circular cross section,iai?xed contact on
breaker arm forming a rubbing block, a contact on the
other end of said arm movable intofand out of engage
said bracket spaced from said post, a non-rotatable
torsion bushing formed of yieldable material mounted 50 ment with said ?xed contact, and a leaf spring connected
between said arm and bracket and effective to bias said
on said post, said torsion bushing having an opening
arm in a direction to close ‘said contacts, said arm being
ytherethrough which has substantially the same cross sec
swingable about said pivot post upon torsion of said
tion as said pivot post so as to tightly engage the pe
bushing.
ripheryrof said post, 'a breaker arm having one end se
9'. An ignition contact set comprising a bracket com
cured to the outer surface of said‘ torsion bushing, a con 55
prising an elongated sheet metal member having a ?at
tact on the other end of said arm movable into and
base, an elongated pivot post struck out from said base
out of engagement with said ?xed contact, and a leaf
spring connected between said arm and bracket and ef
and extending transversely from said base leaving an
elongated opening in said base, said pivot post being of
tacts, said armbeing swingable about said pivot post upon 60 non-circular cross section, an elongated stiffening and
reinforcing ?ange bentvup at one edge of said base oppo
torsion of said bushing.
fective to bias said arm in a direction to close said con
site‘ the opening, a ?xed contact on said bracket spaced
'6. An ignition contact set comprising a bracket com
from said post, a non-rotatable torsion bushing formed
prising an elongated sheet metal member having a flat
of- yieldable material mounted on said post, said torsion
base, an elongated pivot post struck’ out from said base
and extending transversely from said base leaving an 65 bushing‘ having an opening therethrough which has sub
elongated opening in said base, said pivot post being of
stantially the same cross section as said pivot post so as
to tightly engage the periphery of said post,“ said bushing
non-circular cross section, an elongated stiffening and
having. an outwardly extending ?ange portion which en
reinforcing ?ange bent up at one edge of said base oppo
site the opening, a ?xed contact on said bracket spaced 70 gages the top surface of said base, a breaker arm having
one- end secured to the outer surface of said torsion bush
from said’ post, a non-rotatable torsion bushing formed
ing, a contact on the other end of said arm movable into
of yieldable material mounted on said post, said torsion
and out ‘of engagement with said '?xed contact, and a
bushing having an opening therethrough which has sub
leaf, spring connected between said arm and bracket and
stantially the same cross section as said pivot post so as
to tightly engage the periphery of said post, a breaker 75 effective to bias said arm in a direction to close said
3,033,947
5
6
contacts, said arm being swingable about said pivot post
upon torsion of said bushing.
2,559,568
2,579,523
2,635,150
Spang ______________ __ Apr. 14, 1953
References Cited in ‘Lhe ?le of this patent
2,713,094
Zocchi ______________ __ July 12, 1955
UNITED STATES PATENTS
1,474,970
Kent ______________ -_ NOV2,209,382
Blattner _____________ -_ July
2,290,073
Thomas ------------ -_ July
2,546,719
Aldridge ___________ __ Mar.
_
5
20,
30,
14,
27,
1923
1940
1942
1951 1Q
2,765,377
2,777,909
2,835,755
2,854,534
2,896,035
Hooven _______________ __ July 3, 1951
Terry ______________ __ Dec. 25, 1951
Buchrnann _____________ __ Oct. 2, 1956
Weil _____________ __.__ Jan. 15,
Filko _______________ __ May 20,
Beauclair ____________ __ Sept. 30,
Harrington et a1 _______ __ July 21,
1957
1958
1958
1959
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