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Патент USA US2131019

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Sept. 27, 1938.
Filed Nov. 9, 1935
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2 Sheets-Sheet 1
“ “ ‘556m’
H0 51-9 u MATTORNEiA
Sept. 27, 1938.
J. 1.. ARTHUR ET m.
2 Sheets-Shéet 2
Filed Nov. 9, 1935
. I”
Patented Sept. 27, 1938
Thompson, Ander
James L. Arthur and William
son, Ind., aaaignors to General Motors Cor
poration, Detroit. Mich, a corporation oi Del-.
Applloa??l November 9, 1935. Serial No. 48,998
“Claim (Cl. 200-19)
Figs. 4 and 5 are sectional and detail views re
'ihis invention relates to ignition timer distrib
utors used in conjunction with automotive en
gines, and is particularly directed to the type oi
spectively of a fragment oi the ball retainer.
Hg. 6 is a iragmentary view in section illustrat
ing certain modi?cations oi the breaker plate and
suction controlled timers.
a means by which the ball bearing support is
One object oi this invention is to provide a
ball bearing support ior the breaker plate oi an
ignition distributor. in which one oi the ball
races is provided by an integral part oi the
breaker plate. and the balls are spring urged into
10 position by a yieldable section oi the breaker
Another object oi the invention is to provide a
breaker plate and a ball bearing race member oi
integral construction and having a yieldable sec
1‘ tion providing spring loading means for the balls
when the assembly is mounted in a.v distributor.
A iurther object oi the invention is to provide
an ignition distributor in which the breaker plate
is directly supported irom the wall oi the cup by
'9 ball bearings whose races are provided by the cup
and an integral part oi the breaker plate.
A iurther object of the invention is to improve
suction controlled timers by providing a stop
post on a bracket mounting the suction unit upon
55 the cup. which stop limits the movement oi a
link making a direct connection between the suc
tion unit and breaker plate.
A iurther object oi the invention is to provide
Fig. 7 is aviewpartly in elevation and partly in
section substantially as indicated by the line and
arrows 1-1 of Fig. 2.
Fig. 8 is a view in elevation with parts shown in 10
section substantially as indicated by the line and
arrows s-s oi Fig. 7.
Fig. 9 is a fragmentary view similar to Fig. 2,
but showing the breaker plate and movable ele
ments oi the suction unit in an adjusted posi
Fig. 10 is a perspective view oi the suction unit
and breaker plate connecting link.
a ball bearing support ior a breaker plate in an
'° ignition distributor, wherein the ball bearings
are disposed in a plane passing through the con
tact points and rubbing block engagement with
the cam, whereby the moment oi iorce tending to
tilt the breaker plate is substantially eliminated.
Further objects and advantages oi the present
invention will be apparent irom the following
description, reierence being bad to the accom
panying drawings wherein a preferred embodi
ment oi one iorm oi the present invention is
clearly shown.
In the drawings:
distributor incorporating the improvements,‘ be
ing a view substantially as indicated by the line
and arrows l-i oi Fig. 2.
Fig. 2 is a top plan view oi the interior oi the
timer mechanism with parts broken away to
show the suction unit in section, the view being
substantially that illustrated by the line and ar
rows 2-! oi Hg. 1, or with the distributor cap
and rotor removed.
Fig. 3 is a perspective view oi the improved
breaker plate showing parts oi the ball bearing
55 assembly insection.
Fig. 11 is a iragmentary view in cross section
substantially as indicated by the line and ar 20
rows ii-li of Fig. 2, and illustrating the means
for anchoring the ball spacer.
In ignition distributors oi the prior art where
a shiitable breaker plate is actuated by a suction
unit, the devices invariably oiier considerable 25
resistance to movement and therefore render the
suction control means'but partly eiiicient. Some
constructions have been proposed ior mounting
the breaker plate by means oi ball bearings, but
in main, these prior art devices in order to re
duce the irictional resistance are either so iiexl
ble or so loosely assembled, that the support of
the circuit breaker by means oi the breaker plate
is rather unstable, and the high irequency opera
tion oi the circuit breaker in opening the con
tacts through the successive engagement oi the
cam and rubbing block, causes the breaker plate
to chatter or rattle upon its ball bearing support,
and in some instances to wobble or oscillate
laterally which latter gives rise to considerable 40
variation in contact opening and wear oi the
moving parts.
The invention disclosed herein overcomes these
objections, and provides a construction charac
terised by minimum irictional resistance. though
assembled with suillcient rigidity to eliminate the
looseness or rattling and wear oi the parts. These
improvements are accomplished by preparing the
suriace oi the distributor cup to iorm an
race way, and by iashioning the breaker
in the iorm oi a shallow cup whose side
are spun or otherwise iormed into an inner
race way, so that a series oi ball bearings re
tained in spaced relation by a ‘ball retainer may
be disposed in the ball races. The balls may be 55
i, ‘19
assembly within the housing will then assume the
position illustrated in Fig. 2 where it will be noted
that the ball bearings have been angularly dis
placed to such an extent that they will be out of
registry with the vertical ways 54 and thereby 5
prevented from being laterally displaced. A stop
pin 72 passing t'ircugh both. the housing wall l0
and displaced.
the band $4 will prevent the balls from be
The breaker plate 58 has special provisions for 10
springing the balls, or for maintaining them in
engagement with each of the race members.
In the present instance three 01' the ball bearings
55 are used as a support for the breaker plate
springing oi‘ the ‘balls is accomplished 15
by punching 0!‘ cutting 3 Slot 74 in the bottom
1' more of the balls when as"
cup. This yieldah'ie section
ans for springing the To!‘ is, in“
to their respective seats in the races.
detailed explanation of the
'~' the speciis ‘to
ad in in iollowing
r rte of
ngnfe line
breaker plate one end of which is
drical form for a timer~distributor fashioned to
provide a
opened through the flange 60 of the breaker plate
item wall ill, with oppositely extend-i
means of a
29 ing bosses ii and i8 forming a Journal hearing
for a ‘it
or shaft it.
The sh
curl’ or slit 76, thus providing
a yieidable section 78 of the breaker plate ?ange 20
t it .
ehsicn it‘ u
;-. behind cne
the balls 56 set near
the free end of the yieldable section and having
~ ""
":centbali 56.
v is ES i.“
Due to
ace in the ?ange of
'lioient inherent re— 25
_ .
he plate, and especially if
' i is made slili'l‘ ' oversize as in the in
Wily-31‘ 28, that has corrmur
Lent the boss iii ;
from‘ the Low .12 wall l2 01' the cup {I
lnhriean“ c
l I
stance of piston rings, to maintain all of the
halls m ?rm. engagement with their race ways,
provide adequate and rigid support for 30
,e breaker plate a
‘Zion press?" '
1* it
~ n‘ 56 and being under
:es the opposite side
'- “oiy and incidentally
engagement with 35
:e way 56 am . n, respective points.
a distributor cap 44 clot",
3 end oi the housing l0.
’ of
“' ts "and 38 adapted to
i terminal members 40 and I2 re
the modification shown in Fig. -6, the hous
provide a ledge ii, adapt
i3 having their adjacent
termediate th
cuter race way for
e. or
te c8.
there is an an
lder'ed grace" "
- \i/ operate to support a
- breaker plate is in the
to receive the and ’
spring member ii formed
to engage and urge l a ring i3 toward the ledge ‘5
‘1” iiange
form ofis aformed
cup ahaving
flange 80,
groovea section
H, and
thus add to the springing of the ball in
62, that provides an inner
Here too, there is illustrated some modi?ca
the ball
58. The
is i’ that
it will
‘firmly engag
‘9 pl"
“e. breaker
' ‘plate. It is of inverted cup .
plurality of the balls '56 when
e formed race way 63 adapted to 60
. assembled, within the housing wall.
~' the plate within the housing is
‘it 51 when seated in the race way
re ainer ring 84 acts in the same
balls in the race
at the edge 5 of ti
late ii \ ~ in“
f-perate in forming an outer 40
ed from the ledge H and in
nd the rim 52 cf the cup
in the form ?rst described.
the breaker plate here is downward, 55
a hall
hove the bottom of the plate so as
ith the cam 22. If desired the
plate may also be provided with the
cticn like that afore described, but 6g,
crowding the ring i3 against the
has been i'ound sufficient to spring load the
v‘ spaced
ace up
88 and Til splieen .
illustrated in
With the
‘"' secured in the breaker plate 58 a pivot
23 "i. vi‘zich there oscillates the contact 05
a. adjustably held against the plate 58
clamp screw Bl, there being provided a slot
6 and eccentric device 88 for moving the bracket
"- ist the
'nount 01' contact opening.
contact 92, as well as an apertured
e wa
11g the pivot post 80, and dis—
n." oi’ the bracket 82 there is
at supporting a contact arm
n a. movable contact 600 for sepa- 75
engine speed, thereby altering the time oi in
rable engagement with the ?xed contact 02. A‘ terrupter operation relative to shait rotation.
rubbing block I02 is also carried by the contact
Means are provided ior actuating the breaker
arm 00 and is adapted'tobeactuatedbythecam plate 00, or 00, and ior de?ning the limits of
22 upon rotation thereoi.,a conducting spring
that actuation, whereby iurther variation or
alteration in the time oi circuit breaker operation
may be accomplished. The particular means
provided here embrace a ?uid displacement or
suction unit I00 comprising a pair oi cups whose
which a lead I00 communicates with a condenser ?anged rims are spun over one another and com 10
10 II0v grounded to the breaker plate 00 by means pressed about the periphery oi a ?exible dia
0! a clip H2 and screw IIO. A second lead IIO phragm I00, the cup I00 being rigidly secured
. joins the terminal screw I00 with a terminal to a ?at portion I00 oi a press metal bracket I00
post I I0 insulatinsly supported in the side wall oi that is mounted upon the outer periphery oi the
I00 being anchored to the arm 00 and secured
to the lug l0, ior urging the arm toward the
cam and ior making electrical ‘connection with a
terminal screw I00 secured to the lug 00, and to
the cup I0.
Reierrins toli‘is.7.itwillbenotedthat the
15 aligned
axes oi the contacts 02 and I00 and now
particularly, the central point oi engagement
between the cam 22 and the rubbing block I02
are substantially coincident with a plane pass
ing through the axes oi the ball bearings. By
housing cup I0 by means oi the screws I02. The
bottom oi the cup I00 and the ?at portion Ill
oi the bracket are apertured at I00 substantially
as illustrated in Fig. 8, such as to provide the
parallel branches oi the opening I00 separated 20
by a tongue I00, and the cylindrical wall oi the
the term "central point oi engagement" is meant
a point midway along the line oi contact between
the rubbing block I82 and the cam 22. In other
words, it one were to consider the iorce applied
housing I0 is cut away at I00 so asto make
provision ior passage and movement oi a link I82
joining the diaphragm I00 with the breaker
plate 00.
by the cam 22 to the rubbing block as being con
centrated at one point. that point would be the
"central point oi engagement" between the cam
and rubbing block. It is desirable to so locate
the circuit breaker and cam with respect to the
ball bearings that this “central point oi engage
ment" vbetween the cam and rubbing block is
the plane oi the ball bearings.
substantially in
because the iorce exerted by the cam upon the
rubbing block then has substantially a zero mo
ment oi iorce with respect to the plane oi the
ball bearings. In other words, the cam
iorces upon the rubbing block such that. ii these
iorces were concentrated at one point. the re
sultant ierce would be applied in the plane oi
the ball bearings. Hence the actuation oi the
circuit breaker mechanism will not then tend to
tilt or wobble the breaker plate and thus interiere
with rotation by the suction operated plate ad
The link I02 has an aperture I80 ior receiving
a p‘n I80 iorming a pivot ior the .link and se
cured to the breaker plate by means oi riveting
as at I88. The other end oi the link is provided
with an opening I00 that is disposed to loosely ?t 80
over the tongue I00 oi the bracket I00, while the
body of the link I02 extends through the slot or
aperture I80 and is connected to the breaker
plate 08. Fixed to the bifurcated end oi the link
I82 such as to close oi! the aperture I90 there is a
washer or plate I02 whose aperture I90 makes pro
vision for rece‘ving a stud I90 extending irom a
spring receiving cup I08 and extending through
the diaphragm I50 and washer I92 where it is
riveted over, thus providing a driving connection
between the diaphragm I56 and breaker plate '00.
Received within the spring cup I98 is a spring 200
engaging the bottom oi a nipple .202 by which
?uid connection oi the chamber is made with the
induction pipe of the engine.
As thus constructed, a unit is provided adapt
tion eliminates such wobbling oi the plate as able to shiit the breaker plate in response to vari
would upset thecorrect timing oi the ignition.
ations in engine suction conditions, in that mani
The speed responsive mechanism 20 includu a iestation within the chamber I00 su?lcient to
weight plate I20 press ?tted upon a portion oi compress the spring 200 will rotate the breaker
the shait I0 as at I22, and provides a pair of dia
plate 08 within the housing II upon the ball bear
metrically disposed pivot posts I20 whose ends ing irom that position illustrated in Fig. 2 where
I20 and oscillatably
“ are secured within the base
the end oi the stud I06 is against the stop tongue
‘ support a pair oi ?yweights I20, having arms en
I00, to that position illustrated in Fig. 9 v ‘here the
lusting means. Moreover the present construc
gaging a cam bar I28 secured on the lower end
oi the cam 22, as indicated at I20. Mounted in
breaker plate 08 has been rotated in a clockwise
direction and the opposite end 0! the aperture I00 55
is engaged by the tongue I08. The amount of
movement of the breaker plate can be regulated
I80 tending to keep the ?yweights I20 in the in
by either lengthening or shortening the aperture
position. A holddown plate I80 is secured to the I00 to meet the desired conditions, but in Fig. 9,
weight base I20 and spaced above the ilyweights the relative periected adjustment of the plate is
and cam bar, but tending to keep them in prep
illustrated by the dotted line showing oi.’ the con
erly assembled relation. The holddown plate I80 tact supporting bracket 82, ior the original posi
has an overhanging ?ange I00, having deiormed tion, while the iull line position is illustrative oi
portions ior stops limiting the outward throw oi the shifted breaker position. The shifting move
the ?yweights. Inasmuch as this speed respon
ment oi the breaker plate is accomplished with a.
sive mechanism is the subject matter oi- another minimum amount of iriction due to the ball bear
opposite ends oi the cam bar I20 there are spring
posts I82, to the ends of which are secured springs
application, further description is not deemed
ing support on the large diameter ball races, pro
necessary at this time. It is to be considered
that rotation oi the shait I0 will act through
vided by the housing wall and ?ange oi the break
er plate. The point of engagement between the
separable contacts 02 and I00 and the central 70
point oi engagement between the cam 22 and
rubbing block I02 being substantially coincident
with a plane passing through the axes oi the ball
bearings, actuation of the circuit breaker mecha
nism will not then tend to tilt or wobble the 10
22 which e?ects the operation
70 breaker
mechanism. As the speed oi rotation oi
the shait It increases the ?yweights responding
to the increased speed move out by centrifugal
iorce and in' so doing tend to rotate the cam 22
upon the extension 20, all in accordance with the
breaker plate, since the force exerted by the cam
upon the rubbing block has a substantially negligible moment of force with respect to the plane
of circuit breaker support.
While the embodiment 01' the present invention
provide a race-Way, a cam mounted on a shaft for
adopted, all coming within the scope of the claims
drical wall provides an inner race war. a series
What is claimed is as follows:
1- In a timer havinga. housing including a. bottom wall and a cup like cylindrical wall, a cam
supporting the breaker plate from the housing 1
wall, a circuit breaker mounted on the breaker
plate and operated by said cam. the central point
15 01' a breaker plate having an upstanding ?ange,
passing through the center 0! said ball bearings, 1
the housing and cam, and means comprising a
Part Of the cup-like breaker plate for sprint
urging all of the ball bearings into seating engage
20 so located with respect to the bearings that the
central point of engagement between the cam and
ment with both race ways.
10. The combination set forth in claim 9,
25 breaker
2. T plate.
he combination set forth in claim 1 further
opens through the periphery of the plate to pro
vide a yieldable section of the breaker plate, said 25
engaging at least one of the balls oi’ the ball bear30 ing for the purpose speci?ed.
3. In a timer having a housing including a bottom wall and a cup like cylindrical wall, a cam
11. In an ignition timer having a housing pro
viding a cylindrical wall, the combination of a 80
breaker plate having an integral cylindrical
?ange, said ?ange forming a complete inner race
35 by the cam, the combination comprising a ?anged
of an outer ball race, a series 01' ball bearings dis- 35
40 ably supporting the breaker plate from the housbreaker plate ?ange and the cylindrical wall for
Substantially equally distributing the ball bear-
breaker plate may be accomplished relative to the 40
of the breaker plate,
12. In a suction controlled timer including a
4. The combination set forth in claim 3, where-
housing having a bottom wall and a cup like cylin
drjcal wall, the combination Qf a cam and d?v- ‘6
characterized by having the breaker plate notched
or the balls in spaced relation.
6. The combination Set forthin Claim 3, Where55 in the plane of the ball bearings is substantially
operation of the circuit breaker will not tilt or
wobble the breaker plate-
7. In a ball bearing distributor time!‘ having
for supporting the breaker plate from the hous-
70 central point of engagement; between the cam and
9- Ili 8- ball bearing distributor time!‘ havinl I
cylindrical housing wall internally grooved to
plate from the cylindrical wall of the cup, a cir~
cult breaker mounted upon the breaker plate and
having a rubbing block engaged by said cam and
in the inner ball race comprises a groove spun into
the cylindrical wall or the breaker plate.
8. The combination set forth in claim
7, where_
ball bearings being disposed within the race ways
from the housing wall, and means including an
integral part fabricated from the breaker plate
itself providing spring loading means for the 55
b lls.
13. In an igni
ducjng bearing for supporting a breaker plate
and including an outer race and an inner race
with interposed balls, the combination of onernce 60
central point of engagement of the cam and rub
ducing bearing for supporting a breaker plate 70
block and carried by the breaker plate
and a 76
cam for enlasinz the rubbin: block slid breaker
plate being so located
member that the plane 0! the
tially coincident ,with
gazement o! the cam and rubbinl block. and
means incorporatinl a part 0! the breaker plate
16. In an ignition timer havlna
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