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Патент USA US3076885

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Feb. 5, 1963
R. B. CLARK
3,076,875
ELECTRICAL APPARATUS
Filed Feb. vl5,v 1961
INVEN TOR.
RICHARD
B. CLARK
Elam/Mp3?!”
ATTO NEYS
United States Patent 0
1
3,976,375
ELECTRHCAL APPARATUS
Richard l3. Clark, Eidney, My, assignor to The Bendix
Corporation, Sidney, NY” a corporation of Delaware
Filed Fete. 13, 1961, Ser. No. 89,015
it) (Claims. ((35. Nth-30)
This invention relates to novel electrical apparatus,
and more particularly relates to a novel ignition breaker
1
C6
3,li75,875
Fatenteol Feb. 5, 1953
2
to the bracket. The construction is such as not to allow
the ordinary engine owner to disassemble the breaker
assembly and to replace parts such as the breaker points
thereon. Consequently, when one part of the assembly
requires replacement, the complete breaker assembly
must be replaced. Further, it is di?icult accurately to
adjust the prior breaker assemblies in the manner de
scribed and to maintain the assembly in its desired ad~
justed position while the retaining screw therefor is be
assembly for a spark ignited internal combustion engine. 10 ing tightened.
The invention has among its objects the provision of
In the breaker assembly in accordance with the present
a novel ignition breaker assembly which is particularly
invention, the breaker lever is pivotally mounted upon a
characterized by its simplicity of construction.
pivot pin, such pivot pin also serving as the means for
A further object of the invention lies in the provision
of an ignition breaker assembly which may readily be 15 retaining the bracket in adjusted position upon the ?xed
accurately adjusted by the use of simple tools such as
screw drivers.
housing or supporting element.
As a result, the con
struction of the breaker assembly is markedly simpli?ed.
The breaker assembly is provided with means whereby the
Yet another object of the invention lies in the pro
bracket thereof may be accurately adjusted after the
vision of an ignition breaker assembly of such construc
tion that it may be disassembled if necessary and one or 20 pivot pin has been loosened, and whereby the bracket
may be forcibly held in the desired adjusted position
more parts thereof, such as the breaker points, may
easily be replaced.
upon the tightening of the pivot pin. in preferred em
bodiments of the breaker assembly, the breaker lever
The above and further objects and novel features of
may be readily removed from the bracket so as to permit
the invention will more fully appear from the following
description when the same is read in connection with the 25 free access to the breaker points so that they may be
more readily dressed or ground when required. in the
accompanying drawings. It is to be expressly under
illustrated alternative embodiment, the construction is
stood, however, that the drawings are for the purpose
of illustration only, and are not intended as a de?nition
such as to allow the contact points readily to be replaced
of the limits of the invention.
In the drawings, wherein like reference characters refer
to like parts throughout the several views,
FIG. 1 is a fragmentary view in plan of a portion or"
an internal combustion engine provided with an ignition
breaker assembly in accordance with a ?rst embodiment
of the invention, the shaft of the engine bearing the cam
after the breaker lever has been removed from the
bracket.
The ?rst embodiment of breaker point assembly in ac
cordance with the invention, which is shown in FIGS.
l, 2, and 3, is generally designated by the reference
character 16. The assembly Ill is shown mounted upon
bly of FIG. 1, the view being taken in the direction from
a ?xed housing portion 11 of an engine. A two-lobed
cam .12 is shown ?xed to a shaft 14, the assembly 19
and cam 12 being so located relative to each other that
the breaker points of the assembly 10 are opened upon
right to left in FIG. 1, a portion of the engine upon
the passage of each lobe of the cam past the cam fol
for operatim the breaker being sectioned horizontally;
FIG. 2 is a view in side elevation of the breaker assem
which the breaker assembly is mounted being shown in 4:0 lower of the assembly. The construction shown is typi
section;
FIG. 3 is a view in section through the breaker assem
bly of MG. 1, the section being taken along the line 3-—-3
of FIG. 1; and
PEG. 4 is a fragmentary view in plan of an alterna
tive embodiment of breaker assembly in accordance with
the invention.
The improved breaker assembly of the invention is il
cal of a two-cylinder, two-cycle engine wherein the shaft
14 is the main shaft of the engine. Such engine is pro
vided with a second breaker assembly, not shown, dis_
posed diametrically opposite assembly it) with respect to
shaft i4. Each such assembly is operatively connected
to energize the spark plug of the respective cylinder of
the engine.
The assembly Tail includes a contact-mounting bracket
16 which may be made of a metal plate cut and bent
lustrated in connection with its use with an engine such
as a two-cylinder, two-cycle engine of which a marine 50 to the appropriate shape. Bracket 16 has a ?at main
body 17 which is adapted to lie upon the ?at upper or
outboard engine is typical. it is to be understood that
outer face of part 11 of the engine. The lower end por~
the ignition breaker assembly of the invention is not
tion of body 17 as it is shown in the drawings is provided
limited to such use, since it is obviously capable of use
to advantage for making and breaking circuits in de
on the right-hand edge thereof with an upstanding ?nger
vices other than engines and when used in an ignition
system may be employed with engines other than the
19 upon which a ?xed contact 2%) is mounted. In the
' ?rst embodiment of the breaker assembly both the ?xed
contact 2;‘? and the movable contact 21, to be described,
are permanently secured to their respective supports as
type illustrated.
Te breaker assembly of the invention is an improve
ment upon prior breaker assemblies wherein a breaker
lever is permanently atlixed to a contact-supporting brack
et by a pivot pin. In such prior constructions an exten
by being riveted thereto. The movable contact 21, which
is disposed generally in alignment with contact 29, is
sion of the pivot pin serves rotatably to locate the bracket
breaker lever 22 made of electrically insulating material.
mounted adjacent the outer end of a ?rst arm 24 of a
Lever 2A is a first-class lever of generally l...-shape.
ad
Lever 22 is pivotally mounted at substantially its mid
the
the 65 point upon a pivot pin or stud 25 which has its lower
or inner end 26 threaded and threadedly engaged in a
in
passage 27 in element ll. As s hown in FIG. 3, pivot
the described prior construction the bracket is held in
pin 25 has a short circular cylindrical portion 29 thereon
the desired angular position by a screw threaded into
’the housing of the engine and extending through an
outwardly of or above its threaded portion 26. Portion
29 of the pivot pin extends through a hole 3!} in portion
arcuate slot in an outer edge portion of the bracket.
70
17 of bracket 16 so that the bracket may turn around
in such prior breaker assemblies the pivot pin mount~
portion 29 of the pivot pin as a bearing. Portion 29
ing the breaker lever is headed and is permanently ai?xed
is somewhat shorter in an axial direction than the thick
on a ?xed part of the engine housing, and to permit
justment of the bracket to permit a cam follower on
breaker lever to be adjusted toward or away from
axis of the cam which operates the breaker lever.
aoraere
3
ness of body 17 of the bracket. Outwardly of portion
29 the pivot pin is provided with a collar 31 which is
?xedly secured thereto as by being made integral there
with. Collar 31 overlies the portion of body 17 of the
bracket which surrounds hole 30 therethrough. It will
4
pivot pin 25 a required small amount when the pivot
pin is loosened, and may be held in a desired adjusted
position until the pivot pin has been tightened. Such
adjustment may readily be made by an operator with
a screw driver in each hand.
With one screw driver
he loosens pivot ,pin 25 suf?ciently to allow bracket 16
be seen that when the breaker assembly is mounted on
to be turned. He inserts the other screw driver 59
element 11 in the manner shown, a tightening of pivot
(FIG. 1) into the slot formed between cars 56 and
pin 22 will cause body 17 of the bracket to be drawn
abutments '57 and turns such screw driver to swing the
tightly into engagement with the outer or upper surface
bracket to the desired adjusted position. The second
of element'll. Contact between the body of the bracket 10 screw driver may be left in place or turned so as to
and the element 11 is particularly concentrated in the
oppose the tightening action of pivot pin 25 as the latter
region of the collar 31; such concentration of the hold
is
being tightened.
ing force allows the bracket to be securely held in ad
In ‘FIG. 4 there is shown a portion of a modi?ed
justed position upon the application of a no more than
breaker assembly in accordance with the invention. The
normal tightening torque to the pivot pin 25. The pivot 15 assembly of FIG. 4 is the same in all respects as that
pin 25 may conveniently be turned to tighten or loosen
shown in FIGS. 1, 2, and 3 with the exception that the
it as described by means of a screw driver engaged in
a slot 35 in the outer end of the pin.
?xed and movable contacts 20’ and 21’ thereof are re
movable from the ?nger 19 and the arm 24, respectively.
Outwardly beyond collar 31 the pivot pin 25 is pro
Thus the contact 20’ has a threaded shank 60 which
vided with a circular cylindrical bearing portion 32 of 20 extends through a hole in ?nger 19. Such contact is
appreciable length. Portion 32 of the pivot Pin is ac
retained on the ?nger by a spring lock washer 6'1 and
eurately received within a journal bushing 34 which may
a nut 62. Contact 21' is similarly mounted on arm
be in the nature of an insert molded into the breaker
24. A threaded shank 64 of such latter contact extends
lever 22.
through a hole in arm 24. Contact 21’ is retained in
The other arm of breaker lever 22 is generally desig 25 place by a spring washer 65 and a nut 66.
nated 36.
Such arm bears an inwardly facing short
With the described construction of the breaker as
sembly of the invention, either of contacts 26)’ and 21’
may be readily removed and replaced as required with
provided with a felt 39 which surrounds the base of cam
out the use of special tools. To allow such replacement
follower 3'7 and extends along the inner face of lever 30 of one or more contacts, the connection at terminal 42
22 wherein the felt is held by opposite bent arms 40
is disassembled so as to allow the one or more leaf springs
which are integral with a sheet metal felt holder 38
connected thereto to be removed. Such disconnection
?xedly mounted on the lever.
of the leaf spring allows the breaker lever 22 to be
At the other end of bracket 16, shown at the top in
35 freely withdrawn axially from the unheaded pivot pin
the drawings, the bracket is provided with a second up
25. When the breaker lever has been thus removed,
standing ?nger 41, the main extent of which lies in a
either of contacts 20' and 21’ may be removed by re
plane generally at right angles to the plane of ?nger 19.
moving the nut and spring washer from its shank, fol
Finger 41 serves as a support for an insulated terminal
lowed by withdrawing the contact axially from its sup—
generally designated 42 by means of which the movable 40 port. A new contact can readily be installed by a re
contact 21 is electrically connected to the ignition cir
verse procedure. The breaker lever is then again mount
.cuit. The terminal 42 is an L-shaped metal member
ed on pivot pin 25 and the terminal 42 is reassembled
having a ?rst arm 44 which lies inwardly of and parallel
so as to restore the parts, including the leaf vspring or
to the ?nger 41. Terminal 42 is secured to ?nger 41
springs, to the positions shown in FIGS. 1, 2 and 3.
by means of a screw 45 which extends in that order
Although only a limited number of embodiments of
through an insulating washer 46, through a hole in ?nger 45 the invention have been illustrated in the accompanying
41, through an insulating washer 47, and through an
drawings and described in the foregoing speci?cation, it
end 52 of a leaf spring, to be described. The shank of
is to be especially understood that various changes, such
screw 45 is electrically insulated from ?nger 41 by means
as in the relative dimensions of the parts, materials used,
?nger 37 which acts as a cam follower riding upon the
outer surface of cam 12. The breaker lever may be
of an insulating sleeve (not shown) disposed in the hole
and the like, as well as the suggested manner of use of the
through ?nger 41 and surrounding the shank of the 50 apparatus of the invention, may be made therein with
screw.
Terminal 42 has an outer arm 49 to which a
out departing from the spirit and scope of the invention
as will now be apparent to those skilled in the art. Thus,
if desired, the lever 22 may be additionally held upon
stud 25 by the provision of a snap or spring ring inserted
toward contacteclosed position, that is, counterclockwise 65 in an annular groove adjacent the outer end of the stud
in FIG. 1 by one or more leaf springs secured to the
so as closely to overlie the lever and to retain the lever
outer end of arm 24 and to ?nger 41. In the embodi
against undue movement axially of the stud. The snap
ment shown, two such springs are employed, an outer
or spring ring, which may be a conventional internal tooth
full length spring 50, which also serves as a current lead
type, a ring’ made from round wire, or a hair-pin type
from terminal 42 to contact 21, and a short inner canti 60 retainer, may readily be applied and removed when
lever spring 51 which serves to reinforce spring 50. The
desired.
ends of springs 50 and 51, shown at 52, are secured to
What is claimed is:
linger 41 as above explained. The outer end of spring
1. In a spark ignition engine having a shaft driven in
50 is straight and lies along a face of arm 24 of the
synchronism with the engine, a cam mounted on the
breaker lever. The shank of movable contact 21 extends 65 shaft for rotation therewith, a ?xed support having a flat
through a hole in portion 54 of spring 50 and thus serves
surface disposed near and normal to the axis of the shaft,
to attach such end of the spring to arm 24.
and a set of breaker points cooperating with the cam so
lead wire (not shown) from the ignition circuit may be
attached.
The breaker lever 22 is constantly resiliently urged
' Body 17 of the bracket is provided at a location out
that the points open and close in synchronism with the
engine, the improved breaker point assembly which com
tween two projecting ear portions 56. Supporting ele 70 prises
a contact support-in the form of a bracket hav
ment 11 is provided with. two upstanding spaced .gen
ing a ?at plate-like body lying upon the flat surface of
erally parallel abutments 57 which provide a slot be
the ?xed support, an upstanding pivot pin extending
‘tween them ‘which is generally in alignment with-slot
througha hole in the body of the bracket generally cen
55. The described slots, ears, and abutments provide
trallythroughsaid
area of-contact with thesuppor-t'and
75
a. gteaaswtetebr the bracket 1:6 may be turned about
wardly of breaker lever 22 with a slot 55 .providedbe
5
3,076,875
having a threaded inner end screwed into a threaded
passage in the ?xed support extending normal to the ?at
surface of the support, a collar ?xedly secured to the
pivot pin and overlying the body of the bracket so as to
thrust the body forcibly against the ?at surface of the
support and to retain it from turning about the pivot pin
when the latter is tightened, the pivot pin having an
outer portion extending a substantial distance outwardly
of the collar, a breaker lever pivotally-mounted on the
6
the breaker lever may be withdrawn axially outwardly
from the pivot pin, and comprising means for retaining
the breaker lever against unwanted axial withdrawal from
the pivot pin.
5. Electrical apparatus as de?ned in claim 4, wherein
the means for retaining the breaker lever on the pivot pin
is a spring which urges the lever toward contact-engaging
position.
6. Electrical apparatus as de?ned in claim 5, wherein
outer portion of the pivot pin, the breaker lever having a 10
the spring is an elongated leaf spring which overlies and
lies generally parallel to the lever with the width of the
ing a second, ?xed contact mounted thereon so as to con
spring parallel to the axis of the pivot pin, and compris
front the ?rst contact, the breaker lever cooperating with
?rst, movable contact mounted thereon, the bracket hav
the cam so as to be moved thereby so that the contacts
ing means to connect a ?rst end of the spring to the
bracket and the second end of the spring to the breaker
periodically engage each other and are then moved apart. 15 lever.
_2. In a spark ignition engine having ashaft driven in
7. Electrical apparatus as de?ned in claim 6, wherein
. synchronism with the engine, a cam
mounted on the shaft
the
breaker lever is a ?rst-class lever having two gen
for rotation therewith, a ?xed support having a surface
erally oppositely extending arms, the pivot pin extends
disposed near and having at least its general plane nor
through the lever intermediate the length of the lever,
_ trial to the axis of the shaft, and a set of breaker points
20 the ?rst contact is mounted adjacent the outer end of a
cooperating with the cam so that the points open and
?rst one of said arms, and comprising a cam follower on
close in synchronism with the engine, the improved
the second arm adjacent the outer end thereof, the
'breaker point assembly which comprises a contact sup
spring being attached to the ?rst arm adjacent the outer
port in the form of a bracket having a plate-like body
lying upon the said surface of the ?xed support and hav 25 end of said arm.
8. Electrical apparatus as de?ned in claim 7, wherein
ing extended contact therewith, an upstanding pivot pin
the spring is connected at one end to the movable con
extending through a hole in the body of the bracket
tact, and comprising an insulated terminal on the bracket,
through said area of contact with the support and having
the other end of the spring being connected to the ter
a threaded inner end screwed into a threaded passage
in the ?xed support, a collar ?xedly secured to the 30 minal, the spring acting as a current lead from the
terminal to the movable contact.
pivot pin and overlying the body of the bracket so as
9. Electrical apparatus as de?ned in claim 8, wherein
to thrust the body forcibly against said surface of the
the contact lever is generally L-shaped, the bracket has
support and to retain it from turning about the pivot
two upstanding projections thereon to which the ?xed
screw when the latter is tightened, the pivot pin having
an outer portion extending a substantial distance out 35 contact and the terminal, respectively, are attached, and
the contact lever has only a small permissible angle
wardly of the collar, a breaker lever pivotally mounted
through which it may be turned from engagement of the
on the outer portion of the pivot pin, the breaker lever
contacts and abutment of the lever with the terminal.
having a ?rst, movable contact mounted thereon, the
10. In an apparatus having a driven shaft, a cam
bracket having a second, ?xed contact mounted thereon
so as to confront the ?rst contact, the breaker lever co 40 mounted on the shaft for rotation therewith, a ?xed sup
port having a surface disposed near and having at least
operating with the cam so as to be moved thereby so that
its general plane normal to the axis of the shaft, and a
the contacts periodically engage each other‘ and are then
moved apart.
set of contacts cooperating with the cam so that the
contacts open and close in synchronism with rotation of
3. In a spark ignition engine having a shaft driven in
synchronism with the engine, a cam mounted on the shaft 45 the shaft, the improved contact assembly which com
prises a contact support in the form of a bracket having
for rotation therewith, a ?xed support having a surface
a body lying upon the said surface of the ?xed support
disposed near and having at least its general plane normal
and having extended contact therewith, an upstanding
to the axis of the shaft, and a set of breaker points co
pivot pin extending through a hole in the body of the
operating with the cam so that the points open and close
in synchronism with the engine, the improved breaker 50 bracket and having a threaded inner end screwed into
a threaded passage in the ?xed support, a collar ?xedly
point assembly which comprises a contact support in the
secured to the pivot pin and overlying the body of the
form of a bracket having a ‘body lying upon the said
bracket so as to thrust the body forcibly against said
surface of the ?xed support and having extended contact
surface of the support and to retain it from turning about
therewith, an upstanding pivot pin extending through a
hole in the body of the bracket and having a threaded 55 the pivot pin when the latter is tightened, the pivot pin
having an outer portion extending a substantial dis
inner end screwed into a threaded passage in the ?xed
support, a collar ?xedly secured to the pivot pin and over
tance outwardly of the collar, a breaker lever pivotally
mounted on the outer portion of the pivot pin, the
lying the body of the bracket so as to thrust the body
(“forcibly against said surface of the support and to re
‘breaker lever having a ?rst, movable contact mounted
60
thereon, the bracket having
moved thereby so that the contacts periodically engage
each other and are then moved apart.
thereon so as to confront the ?rst
contact, the breaker lever cooperating with the cam so
as to be moved thereby so that the contacts periodically
engage each other and are then moved apart.
4. Electrical apparatus as de?ned in claim 3, wherein 7
the outer end portion of the pivot pin is headless whereby
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,290,078
2,519,976
Thomas _.'. __________ _.. July 14, 1942
Phelon ______________ __ Aug. 22, 1950
2,847,524
Slick ________________ .
Aug. 12, 1958
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