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Патент USA US3091682

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May 28, 1963
Filed Jan. 16, 1959
4 Sheets-Sheet 1
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$15 .3
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May 28, 1963
Filed Jan. 16, 1959
4 Sheets-Sheet 2
May 28, 1963
Filed Jan. 16, 1959
4 Sheets-Sheet 3
May 28, 1953
4 Sheets-Sheet 4
Filed Jan. 16, 1959
“9 @W
United States Patent 9 ”
Patented May 28, 1963
It is thus one of the objects of the invention to pro
vide a breaker point unit for internal combustion engine
ignition systems which may be pre-set to provide proper
timing when used with a pre-set distributor whereby the
Ernst A. Longenecker, 411 S. Higby St, Jackson, Mich.
Filed Jan. 16, 1959, Ser. No. ‘787,253
contact gap, condenser and cam are mounted upon a
18 Claims. (Cl. 206-31)
common support plate and replaced and installed as a
unit without the use of tools or special skills.
The present invention pertains to ignition components
for internal combustion engines and particularly relates
to improved distributor elements wherein portions of the
Another object of the invention is to provide a timing
unit employed in the primary circuit of an ignition sys
distributor circuit consist of separate units which may be 10 tem which includes a replaceable cam, contact points
and condenser as a unit which is mounted as to be sensi
replaced and interchanged without special skills or tools.
tive to centrifugal and vacuum regulated spark advance
The present invention is a continuation-in-part of my US.
Patent No. 2,923,785.
As is common knowledge most ignition di?iculties in
_A further object of the invention is to provide a dis
internal combustion engines arise from the wearing, pit 15 tributor wherein the components thereof are economical
ly manufactered, are readily installed and removed from
ting and break down of the-breaker points which comprise
a part of the primary ignition circuit and as these contact
the distributor housing and which reduces the number 0
breaker points wear, erratic engine performance results.
components over conventional practice.
constructions now in common use the breaker points are
in the form of a switch unit which includes a cam follower
a unit.
Yet another object of the invention is to provide a
The correction of such a condition necessitates replace
ment of contact points and at the time of such'replace 20 ?xture on which a breaker point-condenser-cam unit may
be pre-adjusted to provide optimum performance and a
merit it is also advisable to install a new breaker point
?xture for pre-adjusting a distributor for receiving such
condenser to insure proper performance. In distributor
Another object of the invention is to provide a timing
wherein the unit is af?xed to a support plate and adjusted 25 unit for ignition systems which may be pre-set to a given
adjustment and may be installed and used in a distributor
thereto to provide the proper contact point‘ spacing as the
without additional adjustment yet, if desired, permits con
cam follower rides on the high point of the distributor
ventional adjustment of the breaker points.
cam lobes. The new condenser is separately installed
Yet a further object of the invention is to provide a
on the support plate and the electrical connections made
?xture for pre-adjusting a distributor timing unit in ac
to the breaker points and the primary ignition circuit.
cordance with the invention employing a test circuit which
This type of construction is troublesome in that tools are
includes the circuit of the unit to be tested.
required for the installation of new breaker points and
Yet another object of the invention is to provide a
more particularly special skill and knowledge is required
breaker point unit'which is held in position by biased
in that the spacing of the contacts is critical. As it
often happens that ignition trouble due to breaker point 35 clamps which prevent assembly of the distributor unless
the clamps are in operative position ‘and in which an im
malfunction prevents the motor from operating at all and
proved structure for maintaining the distributor in assem
as such breaker point failure may occur without warning
bled relation is provided.
the motorist may experience great inconvenience due to
_ A still further object of the invention is to provide an
his inability to remedy the trouble himself.
improved vacuum spark advance structure in ignition dis
The adjustment of the breaker point gap when installed
tributors and to provide improved means for maintaining
in accordance with conventional practice is usually meas
1saaid spark advance structure mounted on the distributor
ured with a fe'eler gage inserted between the contacts
o y.
and it is often di?icult to obtain an accurate gap measure
These and further objects of the invention arising from
ment with this type of gage. Preferably a dial indicator
gage should be used and it is one of the purposes of the 45 the structural details of the described embodiments will
invention to provide a method in which breaker points
may be readily adjusted by such a gage.
To overcome the primary objections to conventional
distributor construction it is the purpose of the invention
to provide a distributor breaker point-condenser-cam unit
which is preadjusted to the proper contact gap and dis
tributor drive shaft relationship and which may be in
stalled in a pre-adjusted distributor merely by removing
the old unit and placing the new unit in position with
out the use of tools or special skills.
Such a unit con
struction is disclosed in my above mentioned copending
application, however, it is the purpose of the instant in
vention to provide a construction and method of pre-set
ting which is particularly adaptable to civilian vehicles and
which lends itself to mass production, ease of manufac
ture, and economical replacement.
become apparent from the following description and
accompanying drawings wherein:
FIG. 1 is a cross sectional view of a distributor em
ployivng the concepts of the invention with the distributor
cap in position,
FIG. 2 is a top plan view of the distributor of FIG. 1
with the cap removed,
FIG. 3 is a partial cross sectional elevational view
taken along line TIL-‘III of FIG. 2,
FIG. 4 is a cross sectional plan view of the distributor
with the breaker point plate and mounting plate removed
and the vacuum advance mechanism shown in section,
FIG. 5 is a detail sectional elevation of the bearing
block support plate,
FIG. 6 is a detail sectional elevation of a bearing block
taken along line VI‘——VI of FIG. 4,
It is also a purpose of the invention to provide a
FIG. 7 is a elevational view, partly in section, of the
distributor having economically manufactured components
distributor of the invention with the cap in place show
which are positive in their operation and may be assembled
ing details of the shaft retaining means, cap spring and
in the distributor with a minimum of housing machining. 65
spring holder,
As manufacturers of internal combustion engines usually
FIG. 8 is an elevational view of the vacuum advance
produce a number of different engine models varying in
housing taken along the line VIII-VIII of
horsepower, cost, size, etc. it is desirable if the manu
FIG. 4,
facturer may obtain a distributor of given construction
which may readily be adjusted and used with all engine 70 FIG. 9 is a plan view of the distributor showing the
centrifugal governor advance mechanism taken along line
models and another purpose of the invention isto pro
IX-IX of FIG. 3,
vide a distributor which is versatile enough for such use.
FIG. 10 is an enlarged plan view of a portion of FIG.
9 showing the weight movement limiting means.
FIG. 11 is a sectional elevational view of the weight
movement limiting means taken along the line Xl-XI of
FIG. 10,
FIGS. 12 and 13 are elevational views of the upturned
centrifugal weight spring anchorages used with the low
and high speed weights respectively,
ter and hole 40 diameter are such as to prevent the wrong
spring from being assembled to the improper anchorage.
A stud 48 is mounted in weight 32 and projects up
wardly therefrom, FIG. 3, and a stud 50 of a larger upper
diameter is similarly mounted in the weight 34. These
studs project through slots 52 and 54 formed in the
centrifugal advance plate 56. The slots 52 and 54 ex
tend in a radial direction and the former is of less width
FIG. 14 is an elevational plan view of the distributor
than the latter as these slots are only a few thousandths
in accord with the invention similar to FIG. 2, how 10 of an inch greater in Width than the cooperating stud.
ever showing a dual ignition breaker point plate installed
in lieu of the single breaker point plate,
This relationship prevents misassembly of the plate 56 to
the weight studs.
Therefore as the weight mounting plate 28 is rotated
the weights 32 and 34 will rotate therewith and have
FIG. 16 is a top plan view of FIG. 15,
15 a tendency to pivot outwardly against the force of the
FiG. 17 is a top plan view of the breaker point plate
attached springs due to centrifugal force. Such weight
FIG. 15 is an elevational sectional view of the dis
tributor timing ?xture as mounted on a distributor,
timing ?xture with .a breaker unit in position for testing
and timing,
FIG. 18 is a detail sectional view of the breaker point
plate ?xture hold down taken along the line XVIII
XVIII of FIG. 17, and
FIG. 19 is a sectional elevational view of the breaker
point timing ?xture taken along the line XIX~—XIX of
movement causes the studs 48 and 50 to move in an
are about the pivot studs 30‘ causing an attendant angular
rotation of the advance plate 56. The weight 32 will
move ?rst as spring 42 is of lighter tension than spring
46 and hence ignition spark advance sensitive to engine
r.p.m. is provided through both low and high speed
ranges as the rotation of advance plate 56 drives the
FIG. 17.
breaker point cam as will be later apparent. The high
It will be understood that although the distributor here 25 speed weight 34 is provided with limit means whereby
inafter described may be employed with any internal
the degree of spark advance at high speeds may be
combustion engine employing a gear driven distributor,
regulated. This limiting means comprises a pivot 58
many of the features disclosed may be incorporated in
frictionally rotatable mounted in the weight and provided
direct driven types of distributors with little or no modi
with a slot whereby the pivot 58 may be rotated by a
screw driver. Pivot 58 is formed with a downward ex
The distributor of the invention takes the general form
tending eccentric portion 60 which, when the weight 34
of gear driven distributors having a cylindrical housing
pivots ‘outwardly, may engage the edge of the weight
10 from which depends a shaft housing 12 on which is
mounting plate, see FIGS. 10‘ and 11, limiting the weight
formed a mounting ?ange 14. A cylindrical drive shaft
movement. Thus, by rotating pivot 58 adjustment of the
16 is journaled within housing 12 on sintered porous
degree of weight 34 movement may be varied and hence
bearings 18 and a drive gear, not shown, is \a?ixed to the
the maximum spark advance regulated. Indicia is im
lower end of the shaft 16 as viewed in FIG. 7. The dis
printed on the weight to indicate the setting of the
tributor is mounted to the engine in the conventional
manner, e.g. the ?ange 14 is a?ixable to the motor block
by clamping means such that the housing 10 may be
rotatably positioned relative to the block and locked in
position. The drive gear a?ixed to shaft 16 meshes with a
pivot 58. This adjustable centrifugal advance limiting
feature permits the distributor to be employed with a
wide variety of engine types and sizes without necessitat
ing separate advance plates for each different engine
model as is the common practice.
gear usually mounted on the cam shaft and in this manner
The advance plate 56 is af?xed to and drives a cylindri
insures a predetermined relationship between the engine
cal support sleeve 62 which is rotatably journaled on shaft
components sequence of operation and the distributor 45 portion 22 and rests on a thrust washer supported on
plate 28. Sleeve 62 is provided at the upper end with
The shaft 16 is provided at the upper regions with a
a radial key projection 64, FIG. 3, which drives the
stepped diameter 20 and a further reduced portion 22
extends upwardly to provide support and guidance for
breaker point cam as will be hereinafter described.
’ As best shown in FIGS. 1 and 3 the housing 10 is
other distributor components as will be later described. 50 interiorly shouldered at 66 and the bearing block mount
The lower region of shaft 16 is grooved at 24 to receive
ing plate 68 rests thereon. To lock plate 68 in position,
an annular snap ring 26, FIG. 7, which may bear against
a pair of diametrically downward projecting inclined
a thrust washer member adjacent the lower bearing 18.
portions 70‘ are formed on plate 68‘ by slitting or de
A Weight mounting plate 28 is press ?tted to the shaft
forming and screws 71, threaded through the housing
step 20 and may engage a thrust washer resting on the 55 10, engage portions 70‘ forcing plate 68 downwardly and
upper end of upper bearing 18. Thus the shaft 16 is
locking the plate in the proper position.
axially positioned by the plate ‘.28 and the snap ring 26,
an economical and simplified means to accomplish this
Centrally the plate 68 is provided with a concentric
opening through which the sleeve 62 projects and inter
secting this opening are three radial slots 72 having
The weight mounting plate 28 includes a pair of pivot 60 parallel sides de?ned by removing rectangular portions
studs 30 affixed thereon in opposed diametrical relation
of the plate. The slots 72 are adapted to receive bearing
to the shaft 16 and a low speed weight 32 and a high
blocks 74 which are formed of a material such as sintered
speed Weight 34 are pivotally mounted to the studs 30.
iron and are of a con?guration as shown in FIGS. 5
The center of gravity of weights 32 and 34 do not coincide
and 6. As observed, blocks 74 are provided with longi
with the radial line interconnecting the center of shaft 16 65 tudinal recesses 76 on two sides thereof for receiving the
and pivots 30, therefore the weights will tend to swing
sides of the slots 72 and the inner upper portions are
out upon rotation of plate 23. The plate 28 includes at
formed with an undercut surface 78 facing outwardly
each end an upturned spring anchorage projection, the low
land a notch 80 facing inwardly. The dimensions of two
speed anchorage being designated 36 and the high speed
of the slots 72 are such the blocks 74 must be forced into
anchorage 38. The projection 36 is provided with a 70 the
slot, the edges thereof actually dig into the recesses
central hole 40 which receives one end of spring 42, the
two of the blocks are thus ?rmly located equal
other end being a?ixed to weight 32. The projection 38 is
distances from the axis of shaft 16. The third block
recessed on each side at 44 to receive one end of spring
74 is slidingly supported with its slot 72 and upon instal
46 which is also connected to weight 34. The dimensions
ling the ring spring 82 under compression within notches
of the loops in the ends of the springs, the spring diame 75 80 this movable block will be biased radially outward.
The bearing mounting plate 68 is notched at 84 to
provide clearance for the vacuum advance structure and
a ground wire 86 is attached thereto for connection to the
breaker point plate as later described.
The purpose of the bearing mounting plate 68 is to
provide the means for rotatably mounting the support
plate v88. Support plate 88 is of a circular disc con
?guration having a central coaxial aperture having a
by a rotor 132 having a key may be affixed to the cam
and oriented thereto in the well known manner.
A pair of upturned projections 134 are diametrically
formed on the plate 106 adjacent the periphery thereof by
slitting and bending. These projections, see FIG. 1, co
operate with the latch surface 96 of clamps 94 as shown
and permit the clamps to ?rmly hold the breaker point
plate 106 in engagement with the support plate 88 yet pro
vide easily operable means for quickly installing or re
block 74 inwardly the plate 88 may be placed on the 10 moving the breaker point plate.
The plate 106 must be accurately oriented to the sup
bearing blocks such that the undercut surfaces 78 engage
port plate 88 and other distributor components to insure
the periphery 90 to hold the support plate 88 in place,
consistent and accurate timing irregardless of how often
note FIG. 3. The plate 88 is maintained parallel to plate
the breaker point plate 106 is changed and this orientation
68 by resting on the locating surface 92 formed on each
15 is achieved by a tang 136 formed on plate 106 by slitting
bearing block.
beveled periphery 90. By biasing the‘ slidable bearing
A pair of diametrically opposed hold down clamps
and upwardly offsetting the tongue above the plane of the
maintaining the breaker point plate thereon. The clamps
plate as observed in FIG. 7. Tang 136 is formed with
a neck 138 of reduced Width by punching openings 140 in
and a cam 112. The breaker points assembly may be
of conventional design and are attached to the plate 106
loads it is known to employ an automatic vacuum con
are mounted on the support plate 88 for the purpose of
plate 106 adjacent the neck during the slitting operation.
are represented at 94 and comprise stamped members
having a latch surface 96 de?ned thereon, FIG. 1, and 20 An elongated radial extending slot 142 is formed in tang
136 and is of a width a few thousandths of an inch greater
an outwardly extending handle portion 918. The clamps
than the‘diameter of pin 104 whereby, when assembled,
94 extend through openings de?ned in plate 88 land are
the pin 104' is received within slot 142 and accurately
mounted on leaf springs 100 a?ixed to the underside of
determines the angular relationship between the plate 186
plate 88 by a rivet 102 formed by displacing metal of
the plate 88. The handle portion 98 projects above the 25 and support plate 88.
i It Will thus be appreciated that by removing ground wire
rim of the housing 10 and when the clamps are open,
86, lead 124 and moving the clamps 94 radially away
e.g. released from the breaker point plate, the handle 98
from the drive shaft axis to disengage from projections
overlaps the rim and prevents the distributor cap from
134 the breaker point plate 106 may be removed from
being positioned on the housing 10.
distributor, removing the breaker point assembly 108,
A pin .104 is a?ixed within support plate 88, FIG. 7,
condenser 110 and cam 112 as a unit. To install a new
and extends both above and below the plane thereof.
plate 186 and the components mounted thereonit is mere
This pin orients the breaker point plate within the dis
ly necessary to correct the ground and lead wires as de
tributor and is also coupled to the vacuum advance
scribed, align cam 112 over shaft portion 22 such that
means as will be later apparent.
A breaker point mounting plate 106 is adapted to be 35 notch 128 meshes with key projection 64 and ‘drop plate
‘186 on the support plate 88 such that pin 104 extends
removable mounted on the support plate 88. The mount
through slot 142. Clamps 94 are then moved inwardly
ing plate 106 and the components assembled and mounted
to engage surfaces 96 with the ends of projections 134 to
thereon form a basic part of the invention as this is the
lock plates 186 and 88 together. The resiliency of springs
member which may be quickly installed or removed
whereby a new pro-timed breaker point unit is readily 40 100 maintains the clamps in ?rm engagement with the
projections and insures a tight, vibration resistant connec
available. On plate 106 are mounted a breaker point
assembly generally indicated at 108, a condenser 110
To provide proper ignition timing at all speeds and
by screws 114 whereby the points may be adjusted 45 trolied spark advance in conjunction with the centrifugal
governor advance means. In accordance with the inven
relative to the plate 106 in the known manner. Tri
tion the vacuum spark advance takes the form best illus
angular shaped openings 116 are formed in plate 106
trated in FIG. 4 wherein two diaphragm housing compo
to align with a similar opening in the breaker point as
nents 144 and 146 are assembled together by folding a
sembly whereby 1a screw driver inserted into these open
ings and twisted will adjust the breaker point assembly 50 ?ange 148 of housing 146 over a flange 150 of housing
144, and a diaphragm 152 of rubber or other suitable
relative to the plate 186 and the point gap may be thus
material is sealingly sandwiched therebetween. The hous
regulated. Assembly ‘188 includes a terminal 118 onto
ings 144-146 are preferably formed of stampings which
which the primary lead 120 may be af?xed. Lead 120‘
may be easily and economically manufactured and hous
passes through a rubber, water-tight grommet 122 affixed
55 ing 144 is formed at one end with a bell ?tting 154 onto
in an opening in housing 10.
which a rubber vacuum line, not shown, may be a?ixed
The condenser 110 is ‘also a?ixed to the breaker point
and a spring clamp may compress the hose onto the ?tting
plate 106 by a screw or other conventional means and is
154. The vacuum line communicates with the carburetor
interconnected to the breaker point circuit by a lead ‘124
throat in the known manner.
which may take the form of a leaf or wire. To insure
The diaphragm 152 is backed on both sides by washers
that plate 106 is always grounded a tit is formed on the 60
156 and a projection 158 formed on link 160 acts as a
plate to which the ground Wire 86 may be attached.
rivet end and extends through central holes in the dia
The cam 112 is mounted on the plate 106 by means of
phragm and washers to a?ix the diaphragm, washers and
a reduced portion 126 extending through a central opening
link together as a unit. A spring 162 of pre-determined
in the plate and the bottom of portion 126 is ?anged to
length and characteristics engages an annular shoulder
prevent the cam from disengaging from the opening. The
of housing 144 and the adjacent washer 156 to bias the
lower end of cam 112 is formed with a radial notch 128
diaphragm toward the housing 10.
which receives key projection 64 of sleeve 62 thereby driv
Link 160 is provided with an elongated slot 164 and an
ing the cam. The cam is also centrally bored to closely
offset arm in which a hole 166 is de?ned. The housing
receive the shaft portion 22 as transverse de?ection of the 70 146 is preferably formed with a rectangular axial project
cam is prevented by the shaft portion 22, however the
ing end 168 which ?ts within a complementary shaped re
cam may rotate relative thereto in response to centrifugal
cess 178 within the housing 10. A spring pin, e.g. a
spark advance compensations. Cam 112 is provided with
transversely contractable pin, is inserted Within holes in
a number of lobes which correspond to the number of
housing 10 and end 168 to maintain the end within recess
engine cylinders and is formed with a keyway 130 where 75 170 and the diaphragm housing a?ixed to the distributor.
Pin 172 also extends through the slot 164 and in this
capacity acts to limit the axial movement of the link 160.
The hole 166 is of a size to closely receive the lower end
rotation of the handle and shaft 208 to be determined.
A small electric battery 218 may be housed within base
299 and one terminal of the battery is afiixed to a
of pin 104, FIG. 7, and through this connection transfers
grounded light bulb 224} which is observable by the op
movement of the diaphragm 152 under vacuum variations
erator and the other terminal is af?xed to a lead 222
into a rotational adjustment of the support plate 88 and
which may be attached to the breaker point assembly
breaker point plate 166 mounted thereon. The bearing
circuit as shown in FIG. 17.
The breaker point plate 106 may be inserted over
blocks 74 insure that this rotational movement of support
shaft 208 whereby the cam portion 126 projects into
plate 88 will be concentric to the axis of shaft 16.
A distributor cap 174, molded of a dielectric phenolic 10 recess 2G6 and notch 128 is engaged by key pin 210
and the plate 166 rests upon plate 202 with the pin 204
compound, is attached to the housing 10 to receive the
spark plug leads and distribute the secondary ignition volt
age in the known manner. Cap 174 includes a plurality
of spark plug terminals 176 and a central secondary cir
extending through the slot ‘142 of tang 136. It will be
appreciated that shaft 263, key pin 21%, plate 202 and
pin 204 simulate the shaft portion 22, key projection 64,
cuit coil terminal 17 8. A carbon resistor 130 connects to 15 plate 83 and pin 164 respectively. Thus as handle 212
is oscillated the cam 112 will rotate and the breaker
terminal 178 forming a part of the cap and a spring biased
points will be opened and closed under the in?uence of
contact 182 mounted on the rotor 132 completes the cir
the cam follower.
cuit from the coil terminal 178 to the spark plug terminals
When the plate 196 is thus mounted on the ?xture a
176 in accordance with the rotational position of cam 112
in the known manner. The underside of the cap 174 is 20 feeler gage or, preferably, a dial indicator gage may be
preferably provided with annular spark barrier ridges 184
to resist voltage leakage and spark jumping. The rotor
is provided with a similar upstanding ridge barrier for the
easily employed to sense the degree of breaker point
same purpose.
adjustment screws of the breaker point assembly are ad
contact opening as the cam is rotated such that the
cam follower passes over the lobes of the cam. The
It is common to employ spring clips mounted to the 25 justed in the conventional manner to increase or decrease
the contact gap to the correct spacing.
distributor housing to hold the cap in position and such
To time the breaker point assembly 108 the handle
clips are preferably used with the invention, however,
212 may be moved clockwise, FIG. 17, until the lower
novel clip holding means are used to a?ix the clips to
most set screw 214 is engaged. At this point the rela
the housing. By forming a pair of diametrically opposed
holes 186 of rectangular con?guration on the underside 30 tion between key pin 210 and pin 204 is the same as
the relation of key projection 64 and pin 104 when the
of the housing 11}, FIG. 7, a spring ‘clip 183 may be
distributor is properly timed, e.g. the timing mark on
affixed to the housing merely by inserting the lower end
the engine is aligned with the timing point thereof and
thereof into the hole. To assemble the clip in this manner
the number one cylinder is coming in the compression
the lower end of the clip is bent at 199 to de?ne a portion
192 and rebent at 194 adjacent the end 196 of the clip. 35 stroke. With handle 212 in this position and the lead
222 connected to terminal 118 a screw driver or similar
The normal distance between portions 192 and 194 is
tool is inserted into the appropriate opening 140 and
greater than the opening of the holes 186 whereby upon
twisted to deflect tang 136 horizontally and hence rotate
inserting these portions into hole 186 portion 194 will be
plate 106 relative to cam 112 until the light 220 either
holes 186 permits the portion 194 to de?ect out such that 40 goes off, if it was previously on, or goes on if it was
previously off. Such adjustment of the tang 136 regu
the end 196 engages shoulder 198 and prevents withdrawal
lates the breaker points plate relative to the cam to that
of the clip from the housing 10. The upper end of clip
point where the electrical contact between the breaker
188 is formed in the conventional fashion and cooperates
point contacts is just broken. It is at this time that the
with a land on the cap. Thus the clips 188 may be af?xed
to housing 10 Without the use of extra pins, hinges or other 45 secondary circuit opens and the spark plug voltage is
released for ignition purposes in cylinder number one.
components and assembly of the clips to the housing is
Although the light circuit is disclosed as self contained
accomplished merely by inserting portions 192 and 194
within the ?xture it will be understood that circuiting
into the holes 186.
using outside power sources may be employed in a simi
As one of the primary objects of the invention is to
provide a breaker point unit which is pre-timed and 50 lar manner and bells, meters or other signal means may
be used to indicate opening and closing of the breaker
adjusted, ?xtures are provided whereby a distributor and
breaker point plate 1% and breaker points may be pre
de?ected toward 192 and ‘a clearance shoulder 198 within
The scale 216 and light 220 may also be employed to
adjusted separately yet will be properly related when
determine the characteristics of the cam. By rotating
assembled. In order to accomplish preadjustment of both
the distributor and the breaker point plate components 55 handle 212 and observing the “dwell,” e.g. the rotational
movement of the cam during which the contacts are
it is necessary to either assemble the plate 166 and
closed may be measured. Thus worn cams and con
distributor together, achieve the proper adjustment and
tacts which have deformed due to “pounding” may be
remove the plate for later use or employ a pair of ?x
readily discovered and faulty operating characteristics
tures representing the distributor components, properly
relate the ?xtures to each other and then employ the 60 analyzed.
The breaker point plate ?xture includes a hold down
?xtures to separately orient the distributor and plate
?nger 224, FIG. 18, which radially moves in a guide
106 components whereby these members will be properly
way in base 290 and is inwardly biased by a spring 226.
related and timed when the plate 196 is installed in the
The ?nger 224 is provided with a beveled edge 228
Pre-timing of the breaker point plate 106 and breaker 65 which overlaps plate 106 and holds the plates 106 and
point assembly 108 may be accomplished on a ?xture as
shown in FIGS. l7—-19 which includes a base element
290 on which is mounted a plate 202 mounting a pin
2'94 and a central recess 2%. A rotatable shaft 208 is
202 in intimate contact.
It is, of course, necessary to properly time the en
gine distributor housing in relation to the engine piston
operation and this may be done in several ways. For
instance, a breaker point plate 106 which has been pre
timed may be installed in the distributor, the engine
started and by the use of a timing light the distributor
a slot within base 2%. Set screws 214 accurately limit
housing may be rotated relative to the engine block un
movement of the handle within the slot. A scale 216
til the timing indicia of the motor aligns under the tim
is a?ixed to the base beneath the handle and an indi
cator at?xed to the handle212 enables the degrees of 75 ing light in the known manner. This procedure can be
centrally journaled in base 201} and mounts key pin 210
and a selectively positionable handle 212 extending from
used only where a pre-timed breaker point plate is avail
able and the engine is substantially timed, requiring only
?ne adjustment.
In assemblying new engines and distributors it is de
sired to employ a distributor timing ?xture as shown in
FIGS. 15 and 16 to minimize the time of assembly and
to simplify the assembly procedure. This ?xture includes
a circular peripheral knurled hand gripped portion 230
himself and by carrying a suitable packaged spare breaker
point plate unit in the vehicle many emergency ignition
troubles may be quickly cured. Another advantage of the
unit construction lies in the ability of the breaker points
to be pro-adjusted by the manufacturer using the proper
gages, etc. to insure that the contact gap is accurately
set and the operation of the points and cam properly
related. Breaker point plates which are removed from
the distributor because of worn contacts may be re
having a bored downward extending hub 232 which may
be slipped over the shaft portion 22. A sleeve 234 is 10 conditioned by a?ixing thereto a new condenser and
breaker point assembly and cam, if needed, which will
mounted on the hub 232 and may be angularly adjusted
reduce replacement costs.
thereto and locked by a set screw 236. A radial arm
Another advantage of the unit breaker point plate con
238 is mounted on sleeve 234 and is provided with a
struction is illustrated in FIG. 14 wherein two breaker
hole 240 which receives pin 104. The lower end of
hub 232 is formed with a radial notch 242 which co 15 point assemblies 108 are mounted on the plate 106 to
operates with the key projection 64. It is the relation
between notch 242 and hole 240 which is critical and
determines the proper timing relationship between the
engine block and drive shaft 16.
provide dual breaker point control of the ignition circuit.
Improved ignition characteristics may be obtained by
using two sets ‘of points connected in parallel relationship
whereby one set of points opens the primary circuit and
An adjustable‘ arm 244 is rotatably mounted on sleeve 20 the other set of points closes the circuit. The respective
cam followers of the breaker point assemblies engage
234 and is provided with a downward projecting flange
slightly different portions of the cam, one lagging the
246 which engages the notch 247 in the rim of housing
other approximately 7°, which permits a longer coil build
10 which orients the distributor cap on the housing.
up time and produces a better ignition spark at high
Arm 244 is locked in position by a thumb screw 24%
projecting through an arcuate slot 250 in the portion 230. 25 speeds. In conventional distributors dual breaker points
usually require a special distributor housing components
The arm 244 and ?ange 246 serve to orient the support
and arrangement, however, dual breaker points may be
plate 88 to the housing 10.
installed in engines using the distributor of the invention
The distributor ?xture is employed in the following
merely by substituting the plate 106 having a single
manner: The engine timing ind-icia is aligned when the
number one cylinder is coming on the compression stroke, 30 breaker point assembly thereon for a plate 106 having
dual breaker points mounted thereto. Such ease of inter
the ?xture is mounted on the distributor as shown in
changing types of breaker points is of importance in new
FIG. 15 which holds the shaft 16, support plate 106 and
auto-mobile sales where dual breaker points are offered as
housing 10 in the proper timing relation for ignition of
optional equipment and may be quickly installed by the
the number one cylinder, the distributor is mounted in
the engine block in engagement with the cam shaft drive
dealer’s mechanics.
It will thus be understood that the distributor of the
gear, the distributor is rotated to take up any backlash
invention discloses structural distinctions and relationships
or play in the cam shaft and gear train and thereupon
in the distributor art which provide a dependable, easily
the distributor ?ange 14 is clamped in position.
It will be understood that the ?xture of FIG. "15 may
assembled and manufactured, economical and quickly
be placed on the ?xture of FIG. 17 to check or set the 40 serviced ignition distributor.
orientation of the two ?xtures and that upon moving
handle 212 to the full clockwise “zero” position the key
pin 210‘ will align with notch 2412 and the pin 204‘ aligns
with the hole 240 in the proper timed relationship for the
Components such as the
centrifugal advance are formed to prevent improper as
sembly and innovations such as the use of snap ring 26,
inclined portions 70, bearing blocks 74, clamps 94, spring
pin 172 and holes 136 combine to reduce materially the
45 number of components and machining operations required
number one cylinder.
in conventional distributor manufacture. The mounting
Thus the use of these ?xtures permits rapid, accurate
‘of the breaker points, condenser and cam on a common
installation of the distributor on the engine block and
permits the breaker point plate 106 and the components
plate to provide a quickly replaceable unit of the most
mounted thereon to be pro-adjusted before installation in
the distributor wherein it is merely necessary to place
the plate 106 in the distributor, connect the ground and
frequently replaced distributor components simpli?es re
secondary leads, actuate clamps 94 and replace the dis
tributor cap to provide a completely assembled operating
mits postponement of the installation of the breaker points
in new engine assembly until the distributor cap is in
stalled eliminating the ohance of foreign matterfouling
One of the advantages of such a construction re
placement of these components to the extent that their
installation may be achieved by the average motorist, per
sults from the ability of the breaker point plates to be 55 the points during engine assembly, minimizes vehicle out
stored in dust proof containers prior to installation in the
)of-service time due to breaker point replacement, permits
the breaker points to be factory timed and adjusted and
distributor and the breaker points need not be installed
until the ?nal engine assembly operation when the dis
tributor cap is af?xed to the distributor.
With conven
tional distributor constructions the breaker points often 60
collected dirt, dust and grease during engine assembly
‘and wiring resulting in earlier failure of the points.
It will be appreciated that the breaker point assembly
permits quick interchange of single and dual breaker point
assembly units.
It will be appreciated that the tang 136 and the adjust
ing thereof permit the angular relationship between the
cam, when positioned for ?ring of the number one cylin
der, and the breaker points cam follower to be very accu
rately adjusted to‘ obtain optimum timing. The adjust
ner without using the timing ?xtures. With the plate 65 able feature of the tang 136, or other locating element
employed for the same purpose, is necessary to obtain
106 af?xed to plate 88 the distributor may be timed in
accurate timing in that the variance of the dimensions
the conventional manner, the breaker point assembly 108
of the mounting plate 106, cam 112, breaker points and
and condenser 110 may be removed from plate 106 and
locations of pin 104 and slot 142 due to manufacturing
replaced by new components and ‘adjusted for contact
gap in the known manner. Thus, although servicing of 70 tolerances will result in each of the breaker point plate
units varying slightly as manufactured and assembled,
the distributor will usually consist of replacing the entire
however, by adjusting tang 136 the individual distinctions
plate 106 repairs may be made where only a breaker point
of each unit may be eliminated and each unit may be
assembly or condenser is available.
standardized. Thus, once the distributor is properly posi
Constructing the cam, breaker points and condenser as
a unit enables the average motorist to install a new unit 75 tioned on the engine proper timing will be insured upon
may be adjusted on the plate 106 in the conventional man
placing plate 1% upon support plate 83 with the pin 1%
projecting through slot 142. By providing adjusting and
means operatively connected to said breaker points en
gageable by said earn.
‘compensation means on the plate 106 itself each breaker
5. In an ignition system including a distributor having
point plate is standardized and eliminates any need to
re-orient the distributor on the engine block when replac
a drive shaft and a rotatably mounted support plate oper
atively interconnected with automatic spark advance
ing the points.
means for rotation thereby, a pre-timed, pre-adjusted re
The components mounted upon plate 1% may take
placeable timing unit including a mounting plate angular~
forms other than those illustrated, for instance, bearings
may be mounted on the plate to accurately rotatably sup
port the cam on the plate itself or tie locating element 10
may take forms other than tang 136 as any adjustable
member af?xed to plate 136 having a hole, pin or similar
mating element could be used which would cooperate with
6. In an ignition distributor having a drive shaft, a drive
nomical construction and dependable operation.
While the above description is limited to the illustrated
embodiments it is intended that the invention be de?ned
only by the spirit and scope of the following claims.
I claim:
1. In an internal combustion engine ignition system,
tatably mounted primary circuit contact support plate,
the improvement comprising a replaceable pretimed
breaker point assembly ?xable to the support plate, said
assembly including a mounting plate, means releasably
af?xing and adjustably relating said mounting plate to
the support plate, a pair of breaker points mounted on
said mounting plate, and cam means rotatably mounted
on said mounting plate having clutch means de?ned there—
on for driving interconnection with the drive shaft, said
cam means being rotated by the drive shaft and adapted
to open and close said breaker points.
2. A pre-timed, pro-adjusted ignition breaker point unit
for use with an internal combustion engine distributor
having a drive shaft and a rotatably mounted support plate
properly oriented to the drive shaft, said unit comprising
a mounting plate, means formed on said mounting plate
for cooperation with readily accessible clamping means
port plate and angularly adjusting said mounting plate
to the support plate.
a pin or hole in the support plate and diaphragm link arm.
The disclosed construction is preferred as being of eco
including a distributor having a drive shaft and a ro
1y adjustably mounted on the support plate and common
means connecting the spark advance means to said sup
sleeve rotatably mounted on said drive shaft, centrifugal
governor spark advance structure drivingly connecting said
shaft and said sleeve, said structure including a weight
supporting plate a?‘ixed to said shaft, ?rst and second
weights pivotally mounted on said plate in opposing re
lationship to said shaft, first and second stud means af
?xed to said ?rst and second weights respectively, a spark
advance plate af?xed to said drive sleeve, ?rst and sec
ond slot means de?ned in said spark advance plate to re
ceive said ?rst and second stud means respectively, the
dimensions of said ?rst stud and slot means being greater
than said second stud and slot means whereby said second
25 slot will not receive said ?rst stud and spring means inter
posed between said weights and said supporting plate.
7. In an ignition distributor as in claim 6 wherein said
spring means comprise ?rst and second springs of differ
ent tension characteristics interposed between said ?rst and
second weights respectively and ?rst and second spring
anchorages formed on said weight supporting plate, said
?rst anchorage adapted to receive only said ?rst spring
and said second anchorage adapted to receive only said
second spring.
8. In an ignition distributor as in claim 6 wherein ad
justable abutment means are mounted on one of said
weights and are adapted to abut said weight mounting
plate limiting pivotal movement of said weight.
9. ‘In an ignition distributor having a housing, a drive
mounted on the support plate, locating means formed on 40 shaft and means rotatably supporting a pair of breaker
said support plate for cooperation with adjustable locat
ing means formed on the mounting plate, a pair of break
er points mounted on said mounting plate, a cam rotatably
mounted on said mounting plate adapted to be driven by
the distributor drive shaft upon ai?xing said mounting
plate on the support plate and cam follower means opera
tively connected to said breaker points engageable by said
3. A pre-timed, pre-adjusted ignition breaker point unit
point contacts, said means including a ‘bearing block
mounting plate af?xed within the housing, said bearing
block mounting plate having a central opening de?ned
therein concentric to the drive shaft, a plurality of bearing
blocks mounted on said plate adjacent said opening, at
least one of said bearing blocks being radially movable
on said plate, means biasing said movable block outward
ly, an outwardly facing undercut surface formed on each
of said blocks, a breaker point mounting plate support
for use with an internal combustion engine distributor 50 plate having ‘a central circular opening having a beveled
having a drive shaft and a rotatably mounted support plate
periphery de?ned therein, said undercut surfaces being
regulated by automatic spark advance means, said unit
comprising a mounting plate, means formed on said
mounting plate for cooperation with readily accessible
adapted to engage said ‘beveled periphery whereby said
support plate is rotatably mounted on said bearing blocks.
10. In an ignition distributor as in claim 9 wherein
quick-release clamping means mounted on the support 55 said bearing block mounting plate rests upon a shoulder
plate, locating means formed on said support plate ‘for co
de?ned in the housing and downward outwardly extend
operation with adjustable, pre-set locating means formed
on the mounting plate, a pair of breaker points mounted
on said mounting plate, a condenser affixed to said mount
ing portions are formed on said mounting plate adjacent
the housing whereby fastening means extending through
the housing may engage said portions to hold said plate
ing plate connected in parallel with said breaker points 60 on said shoulder.
and a cam rotatably mounted on said mounting plate
adapted to be driven by the ‘drive shaft and means en
gaging said cam adapted to actuate said ‘breaker points
upon rotation of said cam.
11. In an ignition distributor, a housing, a drive shaft
rotatably supported within said housing, rotatably
mounted breaker points within said housing and vacuum
operated spark advance means adapted to rotate said
4. In an engine ignition system including a distributor 65 breaker points about the axis of the drive shaft, the im
having a drive shaft driven in timed relation to the engine
and a rotatably mounted support plate, a pre~timed, pre
adjusted breaker point unit comprising a mounting plate
removably mounted on the support plate, means adjust
provement comprising a recess formed in said housing, a
protuberance formed on the Vacuum operated spark ad
vance means housing complementary to said recess and
receivable therein, a pin passing through said distributor
ably locating said mounting plate to the support plate, a 70 housing, recess, and protuberance to a?ix said vacuum ad
pair of breaker points mounted on said mounting plate, a
vance means to the distributor, said vacuum advance
cam rotatably mounted on said mounting plate adapted
means including an axially movable link extending
to be driven by the distributor drive shaft upon af?xing
through said protuberance into said housing, an axial ex
said mounting plate on the support plate and cam follower 75 tending slot de?ned in said link, said pin passing through
16. A ?xture for pre-adjusting and pre-timing an igni
tion breaker point unit comprising a mounting plate, a
pair of breaker points adjustably mounted on said plate,
said slot whereby said slot and pin limit the axial move
ment of said link.
12. In an ignition distributor having a drive shaft and
a cam rotatably supported on said plate having key co
operating means engageable with a distributor drive shaft
driven key, an adjustable locating means mounted on said
a primary circuit contact support plate, the improvement
comprising 1a replaceable breaker point mounting plate
ai?xable upon said support plate, a pair of breaker point-s
plate and a cam follower operatively interconnecting said
points and cam, said ?xture comprising a key engageable
af?xed on said mounting plate, a condenser ai?xed on
said mounting plate connected in parallel with said break
er points, a cam rotatably supported on said mounting
with the cam key cooperating means for orienting the
cluding a housing and a cap mounted on said housing,
retaining means maintaining the cap on the housing, said
the breaker points slightly break contact.
plate adapted to open and close said points indirectly 10 cam to said ?xture and locating means mounted on said
?xture in pre-determined relation to said ?xture key for
driven ‘by said drive shaft, a de?ectab'le tang formed ‘from
cooperation with the locating means of the mounting plate,
a portion of said mounting plate, a hole de?ne-d in said
and a test circuit including said plate, breaker points and
tang and a pin mounted in said support plate adapted
indicating means employed in conjunction with said ?xture
to align with and project through said hole upon proper
whereby said plate mounted locating means may be ad
orientation of said mounting plate to said support plate.
justed to rotate said breaker points about said cam until
13. In an internal combustion ignition distributor in
17. A ?xture for pro-adjusting and pre-timing an igni
tion breaker point unit as in claim 16 wherein means are
retaining means‘ comprising a spring clip of elongated,
bowed free ‘form, one end of said clip being formed with 20 provided for rotating said ?xture key whereby the cam
may be rotated to open the breaker points to a maximum
a portion adapted to engage the cap, the other end being
opening for pre-adjusting the breaker point gap.
formed with a ?rst portion bent back toward but less
18. An internal combustion engine ignition distributor
than 180° to a second adjacent portion and spaced there
comprising, in combination, a distributor housing, a rotat
from, a recess de?ned in said housing adapted to receive
said ?rst and ‘second portions and of such dimension as 25 able drive shaft within said housing having a cam driven
thereby, a rotatably mounted support plate within said
housing, spark advancing means mounted on said housing,
means interconnecting said spark advancing means with
to de?ect said ?rst spring clip portion toward said second
portion during insertion and abutment means within said
recess adapted to engage the free end of the said ?rst por
tion to prevent said clip from being withdrawn from said
said support plate for producing rotation of said plate,
30 a pretimed breaker point mounting plate mounted on
said support plate, means releasably mounting said mount
ing plate on said support plate, interacting locating means
tor including a housing and a cap mounted on said hous
de?ned on said plates orienting said mounting plate to
ing, retaining means maintaining the cap on said housing,
said support plate in predetermined relation, a breaker
said retaining means comprising a spring clip of elon
gated bowed vfor-m, one end of said clip being formed 35 point assembly mounted on said mounting plate including
cam follower means operatively engaging said cam, and
to engage the cap, the other end of said clip comprising
means adjustably mounting said breaker point assem
a double bent portion deformed at least 90° back in the
bly on said mounting plate.
direction of the bowed intermediate clip section, said
double bent portion comprising ?rst and second portions,
References Cited in the ?le of this patent
said ?rst portion being bent back more than 90° and less 40
than 180° with respect to said second portion to de?ne an
14. -In an internal combustion engine ignition distribu~
acute angle therewith, a recess de?ned in said housing
opening in a direction away from said cap adapted to re
ceive said double bent portion and ‘dimensioned as to 45
Mallory ______________ __ May 18, 1926
Schneider _____________ .._ July 16, 1935
Bales ________ __- _____ .__ Sept. 6, 1955
engine block wherein the distributor includes a drive shaft,
key means rotated by the drive shaft, a support plate
mounted within the distributor and locating means
mounted on the support plate, said ?xture comprising ?rst 55
means adapted to engage and cooperate with the key ro
tated by the drive shaft and second means pro-determined
ly related to said ?rst means cooperating with the support
Turlay ______________ __ Nov. 1,
Hartzell et al. ________ __ Oct. 30,
Winkley _____________ __ July 30,
Slick _______________ __ Aug. 12,
Kline _______________ .. June 2,
Hagmaier et a1 ________ __ Mar. 22,
Norris et al. _________ __ Dec. 20,
Mason _______________ __ July 4,
plate locating means whereby the drive shaft and support
plate may ‘be held in a ‘pre-determined relationship while 60
the distributor is assembled to the engine block.
de?ect said ?rst portion toward said second portion dur
ing the insertion into said recess and abutment means with~
in said recess adapted to engage the free end of said ?rst
portion to prevent said ‘double bent portion from being
withdrawn from said recess.
15. A ?xture ‘for orienting an ignition distributor to an
Arthur ______________ __ Jan. 16, 1940
Lautzenhiser __________ __ June 23, 1953
Schneider et a1 ________ __ Aug. 31, 1954
Heidegger __________ __ Mar. 22, 1955
Brunk _______________ __ July 12, 1955
France _____________ .. Apr. 4, 1933
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