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Патент USA US3034107

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May 8, 1962
J. B. ENGLISH ET AL
3,034,097
IGNITION SWITCH
Filed Oct. 8, 1959
3 Sheets-Sheet 1
JACK B. ENGLISH
JAMES W. HUBBARD
INVENTORS.
BY
HTTOEA/EY
May 8, 1962
J. B. ENGLISH ET AL
3,034,097
IGNITION SWITCH
Filed Oct. 8, 1959
3 Sheets—Sheet 2
32
//
361-.
34
37
k:
30
FIG. 3
654 [52
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1-:
48
so‘ I
I 46
I
[~44
I
I‘ 1 ||
___
42
[32
Control Umt
134
JACK B. ENGLISH
--—
T
JAMES W. HUBBARD
INVENTORS.
FIG. 4
BY %%m
A Tron/v5?
May 8, 1962
J. B. ENGLISH ET AL
3,034,097
IGNITION SWITCH
Filed Oct. 8, 1959
3 Sheets-Sheet 3
{Q24
Control Unit
JACK B. ENGLISH
JAMES W. HUBBARD
INVENTORS.
FIG. 6
BY
A Tro/iwé' Y
ice
2
l
' 3,ti34,t597
IGNITTGN SWITCH
>
Jack Balline English, 6736 E. 24th St, Tulsa, Okla, and
James William Hubbard, 51-4 S. Muskogee St., Sapulpa,
Okla.
3,034,097
Patented May 8, 1962
.
7
Filed Oct. 8, 1959, Ser. No. 845,124."
2 Claims. (Cl. 340-52)
The circuit is completed when the vehicle reaches the
predetermined critical angle a. The baffle 36 prevents
the conductive solid 50 from assuming a position, as
shown by the dotted lines due to external verticalyforces.
Baflle 37 prevents the solid 30 from assuming a position
as shown by the dotted lines due to external centrifugal
forces.
.
The control unit of FIGURE 3 is placed in an ignition
circuit as illustrated in FIGURE 4 wherein ignition switch
This invention relates to a control unit for vehicles and
more particularly to an improved device for breaking 10 40 in series with the ignition coil 42, power supply 44
and normally closed contact 46 of holding relay 48 form
the ignition circuit of a vehicle when the vehicle assumes
the ignition circuit continuity. The control unit is con
a predetermined position.
nected in series with the holding relay coil and a power
The main object of this invention is to provide a con
supply. This circuit is open until the vehicle and the
trol unit which will maintain a continuous ignition cir
cuit while the vehicle is in a substantially horizontal 15 control unit are tilted to the critical angle a at which time
the movable contact within the control unit completes
position and which will break this circuit when the vehi
the control unit circuit. At this time the relay breaks
cle reaches a predetermined angle from a horizontal posi
the contact 46 and closes the contact 50. This opens the
tion.
ignition circuit and closes a secondary indicator circuit
A further object of this invention is to provide a con
trol unit having a conductive ?uid or mobile means is 20 through manual switch 52, and indicator light 54. The
insensitive to normal operating conditions of the vehi
cle and sensitive to a predetermined tilt of the vehicle
ignition system will remain opened and the indicator cir
cuit will remain closed until both the control unit cir
cuit and the indicator circuit are opened. The control
'
unit circuit may be opened by leveling the vehicle. The
A still further object of this invention is to provide a
control unit that is inexpensive and easy to install on 25 indicator circuit may be opened by opening the manual
switch 52. Manual switch 52 is preferably a resiliently
any type vehicle.
actuated-normally closed contact switch.
Further objects and advantages of the invention will
In operation the control unit of FIGURE 1 is ?xed
become apparent from the following description and
from a horizontal position.
claims, and from the accompanying drawings, wherein:
to the vehicle such that the conductive ?uid assumes a
FIGURE ‘1 is a View, partially in cross-section, of one 30 position as shown in FIGURE 1. A Wire extending
from the power supply is connected to one terminal of
embodiment of the control unit in a substantially hori
the control unit and a wire extending from the ignition
zontal position;
'
coil is connected to the other terminal of the control unit
FIGURE 2 is a View, partially in cross-section, of the
to complete the circuit. An ignition switch 24 may be
control unit tilted at a predetermined angle;
FIGURE 3 is aview of another embodiment of the con 35 positioned within this circuit as shown in 'FIGURE 5.
The movement of the vehicle due to vibrating, starting,
I trol unit;
FIGURE 4 is a wiring diagram of the preferred con
trol unit within a vehicle ignition system;
‘
FIGURE 5 is a wiring diagram of an alternate con
stopping, and the like tends to cause the iluid to flow out
of the frusto-conical section 8 of housing 2. This flow is
impeded by the conical shape of body \10 in combination
trol unit within an ignition circuit; and
FIGURE 6 is a diagram of a vehicle showing the angle
with the undercut section 18 thereof. A reserve supply
of ?uid is held in the undercut section 18 of the body.
at which the vehicle must be tilted to actuate the control
The electrical continuity from the ?rst terminal through
the housing 2, ?uid, body and into the second terminal
is not disrupted during normal operation of the vehicle.
unit.
'
Referring to the drawings and more particularly to
FIGURE 1, the preferred embodiment of unit housing 2 45 When the vehicle reaches a critical angle a the ?uid in
the control unit flows into the upper portion of the
is formed with vertical sides 4, an intermediate plateau
housing as shown in FIGURE 2.
6, and a irusto-conical section 8. A conductive body \lll
having a layer 12 of insulating material around its upper
The embodiment (FIGURE 3) in combination with a
holding relay as shown in FIGURE 4, provides an addi
(extremities) is mounted within an insulated support 14
at its lower end and within the non-conductive cap 16 50 tional safety feature. The circuit through the control
unit once the holding relay coil is open during normal
at its upper end. An undercut section 18 is provided
operation of the vehicle. The indicator circuit is also
within the body 10. A ?rst electrical lead 29‘ is attached
open as the contact 50 of the holding relay is open. The
to the housing and a second electrical lead 22 is attached
ignition circuit is closed by both the ignition switch and
to the body ll). The annular space formed between
the body 10 and the frusto-conical section 8 is par 55 the holding relay contact 46 being closed. When the
tially ?lled with a conductive ?uid such as mercury.
FIGURE 2 shows the apparatus of FIGURE 1 in a
critical angle wherein the conductive ?uid is not in con
vehicle assumes the critical angle cc, the control unit com
pletes the control unit circuit thus energizing the holding
relay coil which in turn opens contact point 46 and closes
contact 50. The holding relay maintains the contact 50
tact with body ll). Thus there is a discontinuity between
60 in a closed position until the indicator light circuit is
the ?rst lead 2t) and the second lead 22.
The control unit of FIGURE 1 may be positioned
broken, as by opening manual switch 52. The ignition
within an ignition circuit as shown in FIGURE 5. The
circuit cannot be completed until both the indicator cir
ignition switch 24 is placed in series with the control unit,
cuit and the control unit circuit are opened. Thus the
the ignition coil 26, and the power supply Zll. Thus the
vehicle may not be operated after reaching the critical
vehicle may be stopped by breaking the circuit with
angle until the vehicle is positioned in an angle less than
either the switch 24 or by tilting the control unit.
the critical angle and the manual switch is opened.
FEGURE 3 illustrates an alternate embodiment of the
It is believed the foregoing description conveys a good
control unit. First the conductive ?uid is replaced with a
understanding of the objects and advantages of our in
conductive solid 30. Second the control unit is changed
from a normally closed circuit to a normally open circuit. 70 vention. The appended claims have been drawn with a
That is, during normal vehicle operation the continuity
view to covering all legimate modi?cations and adapta
between ?rst lead 32 and second lead 34 is disrupted.
tion.
3,034,097
3
We claim:
1. A control unit including a conductive housing de?n- ’
ing a chamber; said chamber having an inverted frusto
conical section, an intermediate horizontal portion con
nected to said inverted frusto-conical section, and a ver
tical portion connected to said horizontal portion; a con
ductive body ?xably mounted within said chamber and
at
housing de?ning a chamber having an inverted frusto
conical section, an intermediate horizontal portion con
nected to said inverted frusto-conical section and a verti
cal portion connected to said horizontal portion with a
conductive body ?Xably mounted within said chamber
and insulated electrically from said chamber de?ning an
annular space between said inverted frusto-conical sec
tion and said body with an undercut in the lower portion
of said body having a ?rst lead connected to said body,
insulated electrically from said chamber de?ning an an
nular space between said inverted frusto-conical section
and said body; an undercut within the lower portion of 10 a second lead connected to said housing, and a liquid
said body; a ?rst electrical lead attached to said body; a
" within said control unit adapted to make contact between
second electrical lead attached to said housing; said an
said ?rst lead and said second lead when said control unit
nular space being ?lled with a conductive ?uid to a point
assumes a predetermined level; a ?rst circuit including
above said undercut section such that when said chamber
said battery, said energizing coil and said control unit;
is in an upright position said conductive ?uid completes 15 and a second circuit including said ?rst lead, said nor
a circuit between said body and said chamber and such
mally open switch, said normally closed manual switch,
that when said chamber assumes a predetermined angle
and said indicator light.
from‘ said upright position said body is isolated electri
cally from said chamber.
'
References Cited in the ?le of this patent
2. In an ignition circuit wherein a lead extends from 20
a battery to an ignition switch, to an ignition coil and
then to ground the improvement comprising, a holding
relay having an energizing coil operating a ?rst armature
to maintain a normally open switch open, and operating
a second’ armature to maintain a normally closed switch 25
closed, said energizing coils being series connected in said
ignition circuit; an indicator light; a normally closed
manual switch; a control unit, comprising a conductive
UNITED STATES PATENTS
1,205,271
Safford _____________ __ Nov. 21, 1916
1,640,695
Dolly __; ___________ __ Aug. 30, 1927
1,740,896
1,858,191
1,915,267
2,155,758
2,774,835
2,984,820
Kilgour ____________ .._ Dec. 24,
Hadley et a1. _________ __ May 10,
Bigelow _____________ __ June 27,
Hinde _____________ __ Apr. 25,
Staley ______________ __ Dec. 18,
Kennell _____________ __ May 16,
‘1929
1932
1933
1939
1956
196-1
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