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Патент USA US2130706

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Sept. 20, 1938.
H. M. SALMOND
2,130,706
ELECTRICAL SWITCHING DEVICE
Filed July 2, 1934
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Sept. 20, 1938.
H. M. SALMOND
2,130,706 '
ELECTRICAL SWITCHING DEVICE
Filed July 2, 1954
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H. M. SALMOND
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2,130,706
ELECTRICAL SWITCHING DEVICE
Filed July 2, 1954
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H. M. SALMOND
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ELECTRICAL SWITCHING DEVICE
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ATTORNEY
2,130,706
Patented Sept. 20, 1938
‘UNITED STATES PATENT OFFICE
2,130,706
ELECTRICAL SWITCHING DEVICE
Hubert Mackenzie Salmond, Fareham, England,
v assignor to Graviner Manufacturing Company
Limited, London, England
Application July 2, 1934, Serial No. 733,520
In Great Britain July 28, 1933
'17 Claims. (01. 200-52)
This invention relates to electrical switching
devices of the kind in which a pendulum controls
the operation of the switch contact elements.
’ An object of the invention is to provide an
electrical switching device for use upon vehicles
and crafts in which the switch contact elements
are actuated by a comparatively powerful spring
under control of a pendulum subject only to small
reaction.
Another object of the invention is to provide a
10
switching device in which the switch contact ele
ments are actuated by a spring operated member
interconnected to a pendulum by a pivotally
.mounted lever element.
A still further object of the invention is to
15
line H-ll of Fig. 10, showing details of the
switch mechanism, and
1
5
Fig. 13 is a detail of the arcuate sector cam
which engages the pendulum cam.
Referring to Figure 1 of the drawings, numeral
2 represents a pivotally mounted pendulum com
prising a mass 3 and a mushroom shaped head 10
in a vehicle or craft in an accident.
With these and other objects in view, the in
vention will be better understood from the fol
a contact adapted to be engaged by a similar con- 20
lowing detailed description taken in connection
with the accompanying drawings wherein:
Figure 1 shows an electrical switch controlled
by a pendulum together with a diagrammatic
representation of a circuit controlled by the
switch.
~
,Figure 2 shows a slightly di?erent form of
switch mechanism to that shown in Figure 1.
Figure 3 shows a mechanism in which the pen
30 dulum is of a di?erent form from that shown in
Figures 1 and 2.
i
'
.
Figures 4 and 4a show arrangements of mecha
nism employing a multiple catch arrangement in
side elevation and front view.
Figures 5 and 5a show a still further modi?ca
tion of a pendulum device.
Figures 6 and 6a show respectively side eleva
further rigid contact element II is provided with
tact carried by another leaf spring l2.
The switch is so arranged that it is adapted to
be operated by a leaf spring I3, su?lciently power
ful to actuate springs l0 and II, but normally en
gaged by the toe H of a lever device [5 carrying 25
at its other end a member l6 adapted to engage
head 4. The lever 15 is pivotally mounted at I1
and is provided with a heel IS, the arrangement
being such that spring I3 is normally retained in ‘
the position indicated in Figure 1, but is re- 30
leased when the mass 3 of the pendulum is dis
placed, for example, due to the tilting of the
mechanism or as a result'oi exceedingly violent
impact.
When spring I3 is released it opens the nor- 35
device arranged to be locked in operated and
mally closed contact points carried by elements 9
and I0 and closes the contact carried by elements
II and I2 and the switch remains in this posi
tion until operating handle I9 is pressed down
non-operated‘ positions.
wardly to a su?lcient extent to force the end of 40
Figures 7 and 7a show respectively side view
and front elevation of an instrument com
prising a pendulum controlled switch device
spring I; into engagement with the heel ll of
lever l5, whereby the element [6 is'lifted clear of
head 4 so that pendulum 2 can assume its normal
mounted in a protecting case.
position indicated in Figure 1.
tion and front view of a mechanismland switch
'
electrical supply resources on a vehicle or craft
switch ‘mechanism in unset position, with igni
which sources comprise battery 20 and generator
2!. Normally one lead is taken from the battery
line Il-Il of Fig. 8, showing the switch spring
contact elements, and operating cams and levers.‘
Fig. 10 is a vertical sectional view similar to
Fig. 8, with the switch mechanism set and the
ignition circuit closed.
45'
Figure 1 shows how the switch controls the
vFig. 8 is a vertical sectional view of my device
taken on the line Ill-40 of Fig. 9, showing the
tion circuit open.
Fig. 9 is a vertical sectional view taken on the
65
v
Fig. 12 is a horizontal sectional view taken on
l, the pendulum being mounted by means of a
ball 5 supported in a socket device 6 carried by
bracket 1 itself secured to a mounting plate 8 of
the device.
The switch mechanism comprises a rigid con- 15
tact element 9 provided with a current conducting
contact engaging a similar contact carried by
the leaf spring contact element I0. In addition a
provide an automatically operable switching de
vice adapted to disconnect all electrical circuits
40
Fig. 11 is a vertical section taken on the line
iii-13 of Fig. 10.
output terminal to the electrical system on a 50 \
vehicle including the lamps and ignition coil as.
well as various electrically operated devices.
This lead is cut and connected to a connector 22
itself connected by leads to normally closed con
tacts 9 and III in such a manner that all cur- 55
2
ensures
rents supplied by battery ‘(it except to the self
such that the pendulums when rotating angularly
do not effect appreciable movement of lever l5,
starter flow over the normally closed contacts.
The generator 2| has its output terminal con
nected to one of elements it or 112, the other be
ing connected to earth or to the other terminal
of the generator, the arrangement being such
that when spring l3 operates spring contacts ill
and N2, the generator is short circuited.
As will be noted the lever 35 is provided with
10 toe and heel parts l4 and it so arranged that
the spring it engages the lever in a plane parallel
and closely adjacent to that through the center of
the lever l5 so that, although the tension of
spring it may be quite considerable, the force
supplied by element 55 to the head 4 of the
pendulum i’ is comparatively small.
Referring to Figure 2, the lever i5 controls
a knife blade switch comprising blade 23 and
?xed contacts 24, a projecting catch 25 being en~
20 gaged by toe M of the lever l5, a helical spring
28 actuating the switch and a projecting mem
ber 2i serving to reset the mechanism after actua
tion as a result of an accident or the like.
but the shape of cam
and cam 45 is such that
when the pendulums move in a forward direc
tion, a movement against the action of the switch
actuating springs is effected and the angles of
these cam elements are so arranged that the
pendulums do not release unless the device is
subject to impact of considerable violence.
In Figures 5 and 5a is shown a modi?ed form 10
of the pendulum comprising a mass 48 carried
by arms re supported by a pivot support 55, the
arms
.orming a cam 5i adapted to engage the
elemen
it of lever l5, the arrangement be
ing such that upon sldeway angular displace
ment of the pendulum the element I6 is released
from the cam 5i when the angle of displacement
attains 'a predetermined value and in the case
of impact in a longitudinal direction the mass
rill swings forward or backwards whereby ele
ment i5 is again released from 'cam 5| thus en
abling lever iii to release the switch controlling
element.
Referring to Figure 3, this figure shows a
In Figures 6 and 6a is shown a form of mecha
slightly differently shaped lever l5 and an operat
nism in which means are provided for operating
ing member 28 actuated by a helical spring the contact assembly so as to disable the elec
adapted to actuate a contact assembly substan ' trical system upon a vehicle by means such as a
tially as indicated in Figure 1. The pendulum key the device thus being capable of preventing
device shown in Figure 3 however, differs sub
unauthorized operation of a vehicle.
30 stantially from that described in Figures 1 and
The pendulum and lever arrangement are prac
2 and comprises a cam device 25 carried ‘by *arms
38 pivotally mounted ‘at 86 upon a collar or
the like 32, itself mounted to pivot or rotate upon
a pin or the like 38. The element l6 of lever l5
normally rests upon cam 29 and if the device is
turned sideways the cam will move away from
element it whereby the lever will be released
when the pendulum attains a predetermined
angular displacement depending upon the length
40
of cam 29.
_
In the case where the mechanism shown in
Figure 3 may be subject to impact in a forward
direction the cam 29 will move forward in a
forward direction causing release of the lever
l5, with resultant operation of the switch.
The contactor 28 is mounted upon a spindle
provided with hand operated means so that upon
rotation against the action of the operating heli
cal spring the catch 28“ will engage heel ill of
lever l5 and bring element l6 into a position in
which the pendulum and cam 29 assume the
normal position indicated in Figure 3.
In Figure 4, is shown a modi?cation of the lever
arrangement in which toe M of lever I5 does
not engage the switch controlling element directly
but engages the long arm 35 of a lever 36 hav
ing a toe 31 engaging the switch controlling ele
ment 38, a heel 39 being provided upon lever 36
for effecting restoration to normal of the mecha
60 nism. The switching device comprises a rotatably
mounted drum 40 provided with conducting seg
ments 4| and a contacting brush element 42. The
switch may be arranged to open or close the cir
cuit as desired but the drum is actuated by a
65
helical spring 43.
The pendulum device takes
the form of a ?ail 44 and lever I5 is pro
vided with a cam 45 engaging a cam shaped por
tion 46 upon pendulum 44.
The pendulum is
‘pivotally mounted at 4'!11 upon a stud or the like
70 41 itself rotatably mounted in a supporting plate
or the like 8.
I
As ‘will be observed, the point of engagement
between lever l5 and the pendulum of Figures 3
and 4 is vertically below the point of support of
75 the pendulum.
The shape of cams 29 and» 45 is
20
30
tically identical to those described in connec
tion with the previously described ?gures, and
the contact assembly is that shown in Figure 1
except that spring i3 is mounted adjacent the
spring assembly and is adapted to eiTect actuation ‘
thereof by an extension i311. The means for
actuating the switch assembly comprises a rotat
ably mounted shaft 52 provided with a project
ing arm 58 adapted to operate springs l8 and
it’ when the shaft is rotated in an anti-clockwise 40
direction. A further arm 54 carried by the shaft
serves to engage spring it to restore the same
into set position in engagement with the toe 3'!
of lever 36.
In order to ensure correct positioning of the
shaft 52, a cam 55 is mounted thereon and is
adapted to be engaged by a spring 56 secured to
the mounting plate 8 of the instrument.
When the cam is shaped as shown the shaft
has two normal positions of 90° angular displace
merit, and inthe normally set position the arms .
50
53 and 54 are so disposed that they vdo not pre
vent operation of the device in case the lever l5
should be released by the pendulum.
The shaft 52 may be mounted by bracket ele
ments ?xed on the plate 8 and provided with tu
bular extensions 51 housing split sockets 58 to
which the shaft 52 is secured. In order to pre
vent unauthorized operation of shaft 52 a spring
59 mounted upon tubular extensions 51 is adapt~ 60
ed to engage the slot in sockets 58 from which it
must be ejected by means of a key 60 which may
have‘slots provided therein adapted to engage
pins disposed in the _slot in sockets 58 so as to
prevent insertion of- keys other than those in
- tended to operate the mechanism.
The tubular
extension 5‘! and socket 58 terminates against
the side of the enclosing casing or cover for the
mechanism through which the key hole is ac~
cessible and to operate the mechanism by means 70
of the key this is inserted into the keyhole and
forced in so as to lift the spring 59, after which
the key and shaft 52 can be turned until spring
56 drops into engagement with the appropriate
indent'in cam 55 in which position the springs
3
I0 and I2 open the battery circuit of the car
and short circuit the dynamo and disable the
high tension system.
A spring 6| also mounted upon tubular exten
sion 51 is adapted to engage the slot in the socket
58 when this has been rotated 90°, and upon
withdrawal of the key this spring locks the shaft
52 and the switch mechanism in the operated
position.
Figures 7 and ‘70 show a practical embodiment
of the invention in which a switch mechanism
comprising a contact assembly and automatically
operable release mechanism is mounted in a pro
tective casing so as to be capable of being mount
15 ed .for example under the bonnet of a motor car.
Electrical leads'are provided from the instrument
‘to the battery and dynamo as well as to the high
tension magneto if such is provided upon a car,
and an additional earth connection is provided
20 from the instrument to effect the appropriate
circuit changes.
.
Referring ‘to Figure 7, numeral ‘III indicates
the bottom of a protective casing, ‘ll being the
top thereof capable of being secured to the bot
tom in any suitable manner. The mechanism
of the instrument is mounted upon a mounting
plate 13 carried by a suitable number of posts
14 securedto the casing bottom 18. The pendu
lum 15 is provided with a central cam surface
$0 16 and is suspended from a support TI by means
of extending lugs which engage a pin 18 mounted
in support ‘I1 in such a manner the pendulum
The insulating sleeve on stud 95 permits spring
98 to close its contact with the contact upon
element 9|v and subsequently the spring 94 is
forced away from engagement with contact 92
whereby the circuit over these contacts is opened.
_When the instrument of the present invention
is employed upon a vehicle, electrical leads are
takenfrom the battery so that all the current
supplied by the battery to the electrical system
except the self-starter is normally flowing over 10
contacts 92 and 94. Contact 9| is connected to
the dynamo output terminal and contact 93 is
connected to the instrument which is connected
to earth. When the instrument operates it will
be observed that contacts 9! and 93 close before 15
contacts 92 and 94 are opened, this has been
found desirable in practice as the dynamo is
disabled before the battery circuit is open,
whereas liability to damage the electrical devices
and lamps exists if the battery circuit is opened
before the dynamo is put out of action.
When the instrument is employed upon a ve
hicle it is mounted so that the pendulum hangs
vertically downwards, centrally over cam 80, and
when the vehicle is overturned or when it at—
tains an angle of approximately 45° the cam 18
disengages cam 88, and, as a result of the action
of spring 90, lever 84 turns in an anticlockwise
direction as shown in Figure 7 due to the dis
engagement of toe 85 with cam 81, and lever 8| 30
turns in a clockwise direction due to the disen
gagement of the long arm of lever 84 with toe
is free to swing in planes at right angles to plate
82, and as soon as cam 18 releases cam 88 the
13. The support 11 is carried by a stud 19 fixed
to plate 13 in such a manner that it is capable
of rotation in a plane parallel to plate 13. The
lever 8| releases lever 84 and this therefore re
cam ‘I6 engages a triangular are shaped cam 88
carried by lever 8| pivotally mounted by pin and
bracket means upon plate 13. Lever 8| is pro
40 vided with toe 82 and heel 83 which are engaged
by the long arm of a lever device 84 pivotally
- mounted by pin and bracket means on plate 13.
The lever 84 is provided with toe 85 and heel
'86 adapted to engage a cam device 81 fixed upon
45 a spindle 88 mounted by a pair of brackets upon
plate ‘I8 so as to be capable of rotation but ?xed
against endway displacement, a resetting handle
89 being secured to an extension of shaft 88 pro
jecting through the protective casing. A helical
spring 98 is carried by shaft 88 and arranged to
rotate the shaft in a clockwise direction when
cam 81 is released by lever 85. The contact as~
sembly comprises ?xed contact elements 9| and
92 and spring contacts 98 and 94. The cam 81
is provided with a projecting stud or pin 95 car
rying an insulating sleeve adapted to engage
spring contacts 93 and 94, the arrangement be
ing such that spring 98 is held in, a normally open
position as shown in Figure '7, but upon release
of cam 81 by lever 84 the stud 95 is rotated until
it engages a stop 96 which is connected to a
terminal which in its turn may be connected to
the high tension magneto if such is employed
upon av vehicle or craft whereby the same is
switched off when the instrument operates.
Stop 96 is insulatingly supported from mount
ing plate ‘I3 and is provided with binding post
H3.v The‘ contact assembly is supported by a
stud “4 attached to mounting plate 13. The
70 stud H4 is advantageously of metal and forms
'part of the switch ‘circuit, and is electrically
connected to mounting plate 13. Binding post
I28 is attached to stud H4. Shaft 88 is jour
nalled in a pair of spaced supporting plates H8,
76 “1, which are attached to mounting plate 18.‘,
leases cam 81 which is rotated so as to effect
closure of springs 9| and 93 and opening of con
tacts 92 and 94 before coming into contact with
the stop 96 whereby this element is connected to
earth. The radius of the cam 80 may be struck
from the center of pin 19 so that no movement 40
of lever 8i is produced when the pendulum ro
tates in a plane parallel to plate 13. Alter
natively, the radius may be struck from slightly
above the center of pin 19 in which case a slight
lift of the cam 88 and lever 8|, against the action 45
of spring 90, is produced when the pendulum is
displaced from its normal central position and
this arrangement tends to retain the pendulum
in a central position.
In the case where a vehicle is subject to impact, '
the pendulum 15 moves forward owing to its
inertia and cam 16 is caused to lift cam 80 and
the long arm of lever 8| against the action of
spring 99 to a predetermined extent so as to pre
vent release in ‘case of a minor impact, for ex 55
ample, when the ‘brakes of a vehicle are suddenly
applied or when a slight impact with another
vehicle or an obstacle takes place which is not
likely to cause serious injury to the driver or
damage to the vehicle. The inclination of the 60
cam 18 is however, such that in the case of a
violent impact release of lever 8| takes place
without fail. The inclination of carn~16 as indi
cated in Figure 7, is 45° and this has been found
to be suitable for practical purposes,
65
The casing comprising parts 18 and ‘II is adapt
ed to be mounted upon a'vehicle, for example,
under the bonnet, and, to facilitate mounting,v
a pair of lugs or the like I I8, I I9 are secured to the
casing bottom whereby the instrument may be 70
secured in a horizontal position with the part ‘II
of the'casing pointing in the direction of travel
of the vehicle.
'
_
Electrical leads I00 soldered or sweated to tags
9.8 upon the contact assembly and secured by 75
4
arsavoe
clamping devices 99 to the bottom of the casing
are provided for connection to the electrical
system upon a vehicle or craft.
In the case of switch devices for use on aero
planes it is desirable that cams 45 and 80 are
shaped somewhat as indicated in dotted lines in
Figure 4a so as to tend to retain the pendulum
in normal position although the instrument is
turned sideways or upside down. In order to en
10 able the mechanism to be reset, helical springs
840 and till may be provided upon the pivot
spindles of levers 34 and ill, Figure 7, tending
of an abrupt acceleration or deceleration of the
vehicle, and manually operable latch-resetting
means for reclosing said electrical contact ele
ments.
4. A switch for controlling the electrical cir
cuits of a vehicle upon a condition of collision
or the like, comprising: a plurality of electrical
contact elements, means for normally maintain
ing at least one pair of said contact elements in
closed-circuit relationship, means for normally
maintaining another pair of said contact ele
ments in open-circuit relationship, means effec
to rotate the same in a direction to effect dis
engagement, also a helical spring ‘lélll or the like
15 may be attached to the pendulum ‘l5 so as to
tend to retain the same in its normal position,
tive to oppose and overcome each of said two
last-mentioned means and invert the normal con
the spring being capable of su?icient extension
lum means associated with said latch means and
effective to release said latch means upon the oc
currence of an abrupt acceleration or decelera
‘to e?ect release in case of impact. When a spring
7130 is attached to pendulum 715, the cam 30 may
20 be shaped as shown in Figure 7a as the spring
prevents disengagement between cams l6 and 80)
except in the case of violent impact. It is of
course to be understood that the various parts of
tact positions, latch means for rendering said
contact-inverting means ineffective, and pendu
tion of the vehicle.
.
20
5. An electrical switching device for rendering
inoperative the electrical circuit of a vehicle upon
a condition of collision or the like, comprising a
the device may be designed and constructed in _ plurality of electrical contact elements, a spring
various other ways, and the various mechanisms
arranged in other combinations than illustrated,
and therefore I do not wish to be limited in any
manner except as set forth in the following
claims.
30
Having thus fully described my invention, what
I claim as new and desire to protect by Letters
Patent is:
1. A switch for rendering inoperative the elec
trical circuits of a vehicle upon a condition of
35 collision or the like, comprising: a plurality of
electrical contact elements, spring-biased means
for maintaining said contact elements in contact
under normal conditions, spring means effective
to oppose and overcome said last-mentioned
40 means to open said contact elements, latch means
for maintaining said last spring means retracted
and‘inoperative, pendulum means associated-with
said latch means and eiiective to release the
same upon the occurrence of an abrupt accelera
tion or deceleration of the vehicle, said spring
means being provided with a manual positive con
trol operable with a single movement to reset said
contact elements in closed position when said
pendulum means has returned to normal posi
tion.
2. A switch for rendering inoperative the elec
trical circuits of a vehicle upon a condition of
collision or the like, comprising: a plurality of
electrical contact elements, means for maintain
55 ing said contact elements in contact under nor
60
65
70
76.
mal conditions, means e?ective to overcome said
last mentioned means and open said contact ele~
ments, latch means for rendering said contact
opening means inoperative, and pendulum means
having a cam element normally in positive lock
ring abutment with said latch means but dis
placeable to release said latch-,means upon a
swinging of the pendulum occasioned by an
abrupt acceleration or deceleration of the vehicle.
3. A switch for rendering inoperative the elec
trical circuits of a vehicle upon a condition of
collision or the like, comprising: a plurality of
electrical contact elements, means for maintain
ing said contact elements in contact under nor~
mal conditions, means effective to overcome said
last-mentioned means and open said contact ele
ments, latcn means for rendering said contact
opening means inoperative, pendulum means as
sociated with said latch means and e?ective to
completely release the same upon the occurrence
actuated member electrically independent of said 25
contact elements for actuating said contact ele
ments, a lever, a pivotal support for said lever,
said pivotal support being attached to said lever
at a point along the length thereof to divide said
lever into two sections of uneven length, means
formed in the shorter of the two sections of said
lever for engaging said spring member and hold
.ing said member under tension, means engaging
the free end of the other of said sections for trip
ping said lever and releasing said spring for actu 35
at'ing said contact elements and pendulum means
for controlling said last means.
6. An electrical switching device for rendering ,
inoperative the electrical circuit of a vehicle
upon a condition of collision or the like, compris 40
ing a plurality of electrical contact elements, a
spring member electrically independent of said‘
contact elements for actuating said contact ele
ments, a lever, a pivotal support for said lever,
means at one end of said lever for engaging and
holding said spring under tension, means engag
ing the other end of said lever for tripping said
lever and releasing said spring for actuating said
contact elements, ‘pendulum means for control
ling said last means and resetting means for re
setting said lever after it is tripped.
7. An electrical switching device for rendering
inoperative the electrical circuits of a vehicle
upon a condition of collision or the like, com
prising a plurality of electrical contact elements, 55
a spring member electrically independent of said
contact elements for actuating said contact ele
ments, a lever including catch means for holding
said spring member in a predetermined position,
means associated with said contact elements for 60
engaging said spring member when the latter is
released by said catch means, pendulum means
for engaging said lever to release said catch
means from said spring for actuating said con—
tact and resetting means for resetting said lever
after it is released.
.
,
8. A switch for effecting changes of the elec
trical circuits upon vehicles and craft upon a con
dition of impact, comprising a vfreely suspended
pendulum, supporting means comprising a pair "
of independent pivots for pivotally supporting
said pendulum with two degrees of rotative free
dom, a spring urged lever adapted to engage and
to damp the movement of said pendulum, con
tact elements held in normal position under
2,180,706
spring action, a spring urged member normally
held in tensioned position by said pendulum and
lever and adapted when released upon occur
rence of impact to actuate said contact elements
to eifect desired circuit changes and manually
operable resetting means for resetting said lever
after it is released.
,
9. An electrical switching device for rendering
inoperative the electrical circuits of a vehicle
10 upon a condition of collision or the like, compris
ing: a panel member, a pendulum' pivotally sup
ported on said panel member, a ?rst lever also
pivotally supported on said panel, means at
tached to said ?rst lever for slidably engaging
15 said pendulum, said ?rst lever having a ?rst latch
device, a second lever pivoted with respect to said
?rst lever and having an end engageable with said
?rst latch device of said ?rst lever, a rotatable
shaft, a spring attached to said shaft, said second
20 lever having a second latch device, means on said
5
for maintaining said switch mechanism in actu-~
ated position, a cam having cooperating means
engageable with said latch mechanism for lock
ing the same, a pendulum having a cam surface
engageable with said cam, and supporting means
comprising a pair of independent pivots for piv
otally supporting said pendulum with two de
grees of rotative freedom, whereby movement
of predetermined amplitude of said pendulum
beyond cam engaging position unlocks said latch 10
mechanism‘and releases said switch mechanism.
15. In a crash actuatable safety switch, a
switch mechanism, actuating means for opening
and closing said switch mechanism and compris
ing a spring normally maintaining said switch 15
mechanism in a released position and further
comprising latch engaging means, a latch mech
anism engageable with said latch engaging means
for maintaining said switch mechanism in actu
ated position, a cam having cooperating means 20
shaft for engaging said second latch device of
engageable with said latch mechanism for look
said second lever when said shaft is rotated
against said spring, an electrical contact device,
and means for actuating ‘said electrical contact
25 device when said shaft and said levers are re
leased by movement of said pendulum so that
ing the same, a pendulum having a cam sur
said ‘shaft is rotated by the action of said spring.
10. An electrical switching device for rendering
inoperative the electrical circuits of a vehicle
30 upon a condition of collision or the like, compris
ing: a rotatable shaft, a spring attached to said
shaft to prevent the rotation of said shaft ex
cept with or against the tension of said spring,
electrical contacts positioned to be actuated upon
the rotation of said shaft, a lever and latch de
vice, means cooperating with said shaft for en
gaging said lever and latch device when said
shaft is turned against thetension of said spring
to hold said shaft in this tensioned position, a
40 camv attached to said lever and latch device, and
a pendulum having means for engaging said cam
to hold said shaft in said tensioned position
until a condition of collision or the like disen
gages said cam from said pendulum means.
45
11. An electrical switching device as set forth
in claim 9 including manually operable means
.for said shaft to reset the switching device after
the switching device has been actuated.
face engageable with said cam, said cam having
its periphery engageable with said pendulum cam
surface substantially'in the form of a circular 25
arc, and a pivot for supporting said pendulum for
movement substantially parallel to the plane of
said arc, said ‘are being substantially struck about _
said pivot as a center, whereby movement of pre
determined amplitude of said pendulum beyond 30
cam engaging position unlockssaid latch mech
anism and releases said switch mechanism.
16. In a crash actuatable safety switch, a
switch mechanism, actuating means for opening
and closing said switch mechanism and compris 35
ing a spring normally maintaining said switch
mechanism in 9. released position and further
comprising latch engaging means, a latch mech
anism engageable with said latch engaging means
for maintaining said switch mechanism in ac 40
tuated position, a cam having cooperating means
engageable with said latch mechanism for lock
ing the same, a pendulum having a cam surface
engageable with said cam, said cam having its
periphery engageable with said pendulum cam 45
surface in the form‘ of a circular arc, said pen
dulum cam surface being recessed in a direction
substantially perpendicular to the plane of said
12. An electrical switching device as set forth ‘ arc, and a pair of mutually perpendicular co
50 in claim 10 including manually operable means _ operating pivots for supporting said pendulum 50
attached to said shaft to reset the switching de
vice after the switching device has been actuated.
13. In a crash actuatable safety switch, a
switch mechanism, actuating means for opening
55 and closing said switch mechanism and compris
ing a spring normally maintaining said switch
mechanism in a released position and further
comprising latch engaging means, a latch mech
anism engageable with said latch engaging means
for maintaining said switch mechanism in actu
ated position, a cam having cooperating means
engageable with said latch mechanism for lock
ing the same, and a pendulum having a cam sur
face engageable with said cam, whereby move
65 ment of predetermined amplitude of said pendu
for movement substantially respectively perpen
dicular and parallel to the plane of said are, said
are being. substantially struck about a center in
said pivot about which said pendulum moves par
allel to the plane of said are, whereby movement 65
of predetermined amplitude of‘ said pendulum
beyond cam engaging position unlocks said latch
mechanism and releases said switch mechanism.‘
17. 'In a crash actuatable safety switch, a
switch mechanism, actuating means for opening 60
and closing said switch mechanism and compris
ing a spring normally maintaining said switch
mechanism in a released position and further
comprising latch engaging means, a latch mech
anism engageable with said latch engaging means 65
lum beyond cam engaging position unlocks said . for maintaining said switch mechanism in actu
ated position, a cam having cooperating means
latch mechanism and releases said switch mech
anism.
'
14. In a crash actuatable safety switch, a
70 switch mechanism, actuating means for opening
and closing said switch mechanism and compris
ing a spring normally maintaining said switch
mechanism in a released position and further
comprising latch engaging means, a latch mech
75 anism engageable with said latch engaging means
engageable with said latch mechanism for lock
ing the same, a pendulum having’ a cam surface
engageable with said cam, said cam havingv its 70
periphery engageable with said pendulum cam
surface in the form of a circular arc,'said pendu—
lum cam surface .‘being recessed, in ya direction
substantially perpendicular to the plane, of said ' '
arc, and a pair of mutually perpendicular cooper
ating pivots for supporting said pendulum ‘.lor the point where said cam arc meets said cam
movement substantially respectively perpendicu surface when said pendulum is in normal posi~
lei‘ and parallel to the plane of said are, said are
being substantially struck about a center in said
pivot about which said pendulum moves parallel
to the plane of said are,
pivot about which
said pendulum moves perpendicular to the plates‘
of said. are being positioned substantially above
tion, whereby movement of predetermined am- '
plltude of said pendulum beyond cam engaging
positlon unlocks said latch mechanism and re»
leases said switch mechanism.
HUBERT MACKENZIE SALMOND.
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