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Патент USA US2079145

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May 4, 1937.
J. l.. ARTHUR
2,079,145
CENTRIFUGAL CONTROL» FOR TIMERS
Filed oct. 7, 1955
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2 sheets-sheet 1
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INVENTOR
BY
Yoîá/
A; ATTORNEY/f
May 4, 1937-
.1.l L. ARTHUR
2,079,145
CENTRIFUGAL CONTROL FQR TIMERS
' Filed OG'C."7, 1935
2 Sheets-Sheet 2
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2' BY alfINVENTOR
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ATTORNEYJ/
2,079,145
Patented May 4, 1937
UNITED STATES PATENT OFFICE
2,079,145
CENTRIFUGAL CONTROL FOR TIMERS
James L. Arthur, Anderson, Ind., assignor to
General Motors Corporation, Detroit, Mich., a
corporation of Delaware
Application October 7, 1935, Serial No. 43,892
13 Claims. (Cl. ZOO-31)
This invention relates to ignition timer dis
tributors and has to do with improvements in
means for controlling the centrifugal advance
range for altering the time of ignition.
5
One of the objects of the invention is to com
bine a holddown plate with stop means` for lim
iting the range of flyweight movement.
Another object of the invention is to provide
adjustable stop means' whereby the range of
flyweight movement may be altered.
A further object of the invention is to im
prove centrifugal mechanism for altering the
time relation of fuel ignition in response to en
.
L)
gine speed.
Further objects and advantages of the present
invention will be apparent from the following
description, reference being had to the accom.
panying drawings wherein a preferred embodi
ment of one form of the present invention is
clearly shown.
In the drawings:
2
Fig. 1 is a vertical section through a timer dis
tributor illustrating the improvements herein
disclosed.
Fig. 2 is a plan view of the holddown plate
and stop means for the improved centrifugal
mechanism.
Fig. 3 is a plan view of the centrifugal mecha
nism with the holddown plate and stop; means
assembled in position.
Fig. 4 is a fragmentary view in section sub
stantially as illustrated by the line and arrows
4-4 of Fig. 3.
Fig. 5 is an elevational View of the speed re
sponsive mechanism.
40
Fig. 6 is a horizontal sectional view through the
holddown plate substantially as indicated by the
line and arrow 6-6 of Fig. 1 illustrating the fly
weights in their in position.
Fig. 7 is a view similar to Fig. 6, but illustrat
ing the flyweights moved to their outer position.
Fig. 8 is a view similar to Fig. 7, but illustrat
ing the holddown plate and stop means moved
to a second position whereby the range of fly
driven by the shaft I4 through the agency of a
speed responsive mechanism 30 later to be de
scribed. Supported within the housing I0 is a
breaker plate 32 having a flange 34 providing
an inner race for a series of ball bearings 36
equally spaced about the plate by a spacing band
4.6 operating to maintain the balls 36 in oper
ative engagement within an outer race 42, pro
vided by the housing I0. The breaker plate 32
l()
supports a contact bracket 44 to which is se
cured the usual fixed contact that cooperates
with a movable contact kcarried by breaker lever
46, oscillatable about a pivot 48 through the
agency of a rubbing block periodically engaged by
the cam 28. The breaker lever 46 is urged into m
engagement with the cam 28 by means of a
spring 50 that operates to electrically connect
the movable contact with the addition of the
lead 52, to a terminal post 54 insulatingly sup
ported by the housing I0. Means are provided
for shifting the breaker plate 32 in response to
engine developed suction by means of a dis
placement unit 56, provided with a link 58 piv
oted to the breaker plate 32 by means of the
device 60. Inasmuch as the breaker plate 32
with its ball bearing support, and the circuit
breaker structure is fully disclosed and claimed
in a copending application, further description
is not deemed necessary herein.
The centrifugal mechanism 36, hereinbefore 30
referred to, comprises a Weight .base 62 press
iitted upon a knurled portion 64 of the driving
shaft I4 at a point removed from its reduced
end 66. Secured within the weight base 62 and
at substantially diametric points, there are a pair C..‘ CI!
of pivot posts 68 upon each of which there is
pivoted a flyweight ‘IG that has a. cam engaging
arm 'I2 as well as a weight arm 14.
The cam
engaging arm 12 is designed to have rolling en
gagement with the cam face 'I6 of a cam bar
18, which cam bar is press fitted or otherwise
secured upon a reduced portion 8D of the cam
28 or an extension thereof, substantially as il
Referring particularly to the specification I0
lustrated in Fig. l. The cam 28 has a cylindrical
bore 82 providing a bearing for the reduced end
portion 66 of the shaft I4. Thus it will be seen
that the cam 28 is capable of limited rotation,
or oscillating movement, upon the extension oi
indicates the usual distributor cup having a
shank portion I2 drilled to provide a- bearing
for a driving shaft i4. The open end of the
housing I0 is closed by a distributor cap I6 pro
In order to further control the amount of an
gular rotation of the cam 28 upon the shaft ex
tension 66, the cam bar ‘I8 is provided with a
»- Weight movement is altered.
Fig. 9 is a modification of a holddown plate
and stop means.
viding the terminals I8 and 20 cooperating with
the conducting elements 22 and 24 respectively
of a rotor 26, supported by a cam 28 variably
the shaft I4 through the centrifugal mechanism.
pair of spring posts 84 to which springs 86 are
connected and thence hooked over the pivot post
68; the springs 86 operating to maintain the iiy 55
2
2,079,145
weights and cam bar in compact relation sub
stantially as illustrated in Figs. 3 and 6, wherein
the weight arms 74 are held in the inward posi
tion close to the extension 80 of the cam.
Spacers 8f3 are disposed about the pivot posts B8
and between the weight base 62 and the iiy
weights '53, and ribs 90 are provided on the weight
base
for spacing the weightsslightly above
the weight base and for reducing the frictional
10 resistance of their inward and outward travel.
Means are provided for confining the weights
in their lateral movement upon the pivot post,
and for defining the extent of outward move
ment. These means include holddown plate
15
which holddown plate is in the form of a
shallow cup having a bottom wall |02 with a de
pending flange or skirt |04.
The bottom wall
While the construction thus far described em
bodies a deformed portion of the skirt |20 as
comprising a iiat, other forms of deformations
may be utilized, and a modification of that is
illustrated in Fig. 7. In that form, the bottom
wall 232 of the holddown plate is apertured at 2| |
so as to leave a bendable portion 220 of the skirt 10
204 constituting the deformed portion, the re
maining portions of the holddown plate being
substantially identical with that hereinbefore de
scribed, all of which are indicated with the addi
tion of 190 to the reference characters.
15
In this modiñed form, the limits of outward
travel of the ñyweights 'l0 are determined by
of the cup is provided with an elongated aper
bending the deformed portion 220 inward sub
ture
stantially as indicated, whereupon the ñyweight
of sufficient dimension that the plate
may be passed down over the cam 28, and thence
moved sideways se that the skirt |04 will sub
stantially embrace the centrifugal mechanism.
A second elongated aperture |08 is also provided,
and, along with the aperture |03 provide means
such that the plate may be passed down over
the end of the pivot posts 53, the spring posts
8d
the connecting springs 86, and yet allow
for clearance of the spring post 84 when rotative
movement occurs between the weight base 62
30 and the cam bar '|8. Still other apertures as the
arc like slots Il@ are provided that pass over
the reduced threaded end | |2 of studs | l 4 secured
at diainetric points on the weight base 62, thus
providing means for holding the holddown plate
iGE in spaced relation to the weight base 62, that
the iiyweights may move radially without meet
ing with obstruction. At appropriate points
about the skirts or" the holddown plate, there are
deformed portions |20 so positioned that when
the holddown plate is assembled With the weight
base, the tip ends |22 of the flyweights will en
gage the deformed portions when the flyweights
travel to their outer extreme, as illustrated in
Fig. 7.
i
by the arrow B, the relation of the parts will then
take the position illustrated in the dotted line
showing of the holddown plate and flyweights.
The relation of the deformed portions
i
and the stud receiving slots ||0, are such
that rotation of the holddown plate with respect
to the weight base will alter the point of engage
ment between the deformed portion |20 and the
tip
of the ñyweight. Also the relation of the
.52S is such that relative angular movement
of the plates to one extreme permitted by the
slots iid and studs lill there will be one point
of engagement that will be nearer the axis of ro
tation than when the two plates are at the other
exfrcrne oi relative angular movement permitted
by e
and stud. Thus, the radial distance
from the axis of the assembly to the point of
engagement between the deformed portion and
the tip oi‘ the rlyweight is lengthened or short
cned depending on the position of the holddown
plate and weight base. When the holddown plate
and weight base have been moved to the de
sire-d- relative position they may b-e secured in
place by an appropriate nut | 24 tightened on the
stud llfl.
Fig. 8 is illustrative of the results that may
be accomplished
relative rotation of the hold
down plate and the weight base. Arrow A indi
cates that the holddown plate has been moved
To upon 'the weight base the limit provided by the
slot |55r and stud H4, the parts taking the posi
tion illustrated in the full line position of the
iig/weights. When the holddown plate has been
moved to the opposite extreme provided by the
slot liü and stud ||4, all of which is indicated
lll is engaged by the tip |22 as shown in full lines,
or the deformable portion 220 may be bent out
wardly as indicated at 220a thus extending the
range of outward movement as indicated by the
dashed line position of the ñyweight 10.
While the embodiment of the present inven
25
tion as herein disclosed, constitutes a preferred
.1, it is to be understood that other forms
might be adopted, all coming within the scope
of the claims which follow.
What is claimed is as follows:
l. An ignition timer comprising in combina
30
tion, a circuit breaker, a cam for operating a
circuit breaker, a driving shaft, means drivingly
connecting the shaft with the cam comprising,
a weight base secured to the shaft, a cam bar
secured to the cam, a pair of studs provided by
each of the bars and the weight base, flyweights
pivotally mounted upon the studs of the weight
base and having an arm engaging the cam bar,
springs secured to a stud of each pair, and a 40
holddown plate superimposed over the cam bar
and flyweights for guiding the outward move
ment of the iiyweights, and means including a
depending flange from the holddown plate lim
iting the outward movement of the flyweights.
2. An ignition timer comprising in combination,
a circuit breaker, a cam for operating a circuit
breaker, a driving shaft, speed responsive mech
anism drivingly connecting the shaft and cam,
said speed responsive mechanism comprising, a
weight base, flyweights pivotally secured to the
weight base, a cam bar mounted on the circuit
breaker cam, and normally urged to enga/ge the
iiyweights, a holddown plate substantially en
closing the cam bar and flyweights, and means
provided by the holddown plate for limiting the
outward movement of the iiyweights.
3. An ignition timer comprising in combination,
a circuit breaker, a cam for operating a circuit
breaker, a driving shaft, speed responsive mech GO
anism drivingly connecting the shaft and cam,
said speed responsive mechanism comprising, a.
weight base, ilyweights pivotally secured to the
weight base, a cam bar mounted on the circuit
breaker cam, and normally urged to engage the
flyweights, a shallow cup inverted over the fly
weights and cam bar, means supporting the cup
from the weight base in spaced relation with the
said weights and bar, and means comprising a
portion of the side wall of the cup for limiting 70
the outward movement of the flyweights.
4. An ignition timer comprising in combina
tion, a circuit breaker, a cam for operating a clr
cuit breaker, a driving shaft, speed responsive
mechanism drivingly connecting the shaft and 75
_ 2,079,145
cam, said speed responsive mechanism compris
ing, a weight base, iiyweights pivotally secured to
the weight base, a cam bar mounted on the circuit
breaker cam, and normally urged to engage the
ñyweights, a plate member superimposed over but
spaced from the cam bar and iiyweights, and de
pending portions from the plate member disposed
for engagement by the free ends of the flyweight
thereby limiting the outward movement of the
flyweights.
one end of the shaft and providing a cam bar,
spring posts mounted in each end of the cam bar,
Ilyweights mounted on the pivot posts, and springs
secured to the spring post and pivot post for
maintaining the ñyweights in compact relation,
a holddown plate apertured to fit over the cam,
the studs and springs and permit their lateral
movement, said holddown plate having provisions
for limited rotation with respect to the weight
base whereby the limits of outward flyweight
close relation to the ñyweights and cam bar,
means spacing the plate from the weight base
and providing for limited rotation of the plate 15
with respect to the base, said plate having a de
breaker in response to engine speed comprising
in combination, a driving shaft, a support pro
vided by the shaft and rotating therewith, ily
weights pivoted upon said support, a cam bar
secured to the cam and spring urged to normally
engage the flyweights, and holddown means for
guiding and limiting the movement of the fly
weights, said holddown means comprising, a plate
having apertures whereby the plate may be passed
over the cam and the spring urging means main
taining the flyweights in centralized position,
means for securing the plate to the support in
spaced relation with the flyweights, said securing
means including arcuate slots in the plate dis
posed over threaded studs on the support whereby
the plate may be moved angularly relative to said
support, and depending flat portions provided by
the holddown means disposed at the outward
40 limit of flyweight travel whereby the flyweights
are brought to rest at a predetermined point, the
rotation of said plate relative to the support oper
ating to change the radial distance at which the
ñyweights come to rest.
45
8. In an ignition timer, a speed responsive
mechanism comprising in combination, a shaft,
a weight base mounted intermediate the ends of
said shaft and provided with a pair of pivot posts,
a cam mounted for oscillatable movement upon
5. The combination set forth in claim 1 wherein
the holddown plate is apertured so as to pass over
movement may be altered.
6. In a timer having a circuit breaker and an
engine operated cam for actuating the circuit
20 breaker, the combination of means for altering
the angular relation of the cam to the circuit
30
3
’7. In a timer having a circuit breaker and an
springs, and supporting post and be disposed in
pending skirt substantially enclosing the weight
base, and deformed portions in the depending
skirt for limiting the outward throw of the fly
weights.
20
9. The combination set forth in claim 8 in
which the deformed portions of the skirt comprise
flats angularly shiftable by the limited rotation
of the plate relative to the weight base for alter
ing the range of outward travel of the flyweights.
10. The combination set forth in claim 8 in
which the deformed portions of the skirt com
prise, bendable sections for varying the limitation
of ilyweight travel.
11. The combination set forth in claim 8 in
which the plate is apertured opposite the skirt
deformations to weaken the skirt support, and
wherein the skirt deformations may be bent
toward or from the shaft for varying the extent
of flyweight travel.
12. In a speed responsive mechanism for an
ignition timer, wherein flyweights and a cooper
able cam bar operate to effect an angular shift
between a pair of coaxial shafts in response to
variation in driven speed of one of the shafts, 40
holddown means and weight stops for the ñy
weights, comprising in combination, a plate dis
posed over the flyweights, skirt portions provided
by the plate engageable by the weights at one
extreme of their movement, thus limiting the out 45
engine operated cam for actuating the circuit
breaker, the combina-tion of means for altering
the angular relation of the cam to the circuit
ward travel of the flyweights, and means defining
the angular relation of the skirt portion with re
breaker in response to engine speed comprising in
50 combination, a driving shaft, a support provided
by the shaft and rotating therewith, fiyweights
alterable so as to vary the extent of outward travel
pivoted upon said support, a cam bar secured to
the cam and spring urged to normally engage
the rlyweights, and holddown means for guiding
55 and limiting the movement of the flyweights, said
holddown means comprising, a sheet metal cup
disposed over the ilyWeights and whose side walls
depend over the support, said side walls providing
flats disposed at the point of iiyweight engage
60 ment for limiting the outward movement of the
flyweight.
spect to the flyweights, said defining means being
of the flyweights.
50
' 13. In centrifugal means for an ignition timer,
the combination comprising, a weight plate, fly
weights carried by the weight plate, and a hold
down plate secured in spaced relation to the
weight plate for confining the movement of the 55
flyweights, said holddown plate having skirt por
tions to be engaged by the ilyweights at one ex
treme of their movement, and means for shifting
the holddown plate relative to the weight plate
for altering the extent of travel of the flyweights.
JAMES L. ARTHUR.
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