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Патент USA US3033964

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May 8, 1962
3,033,954
W. J. THOMPSON
ROTARY SPEED RESPONSIVE SWITCH DEVICE
Filed March 22, 1960
2 Sheets-Sheet 1
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BY
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ATTO NEW
May 8, 1962
w. J. THOMPSON
3,033,954
ROTARY SPEED RESPONSIVE SWITCH DEVICE
Filed March 22, 1960
2 Sheets-Sheet 2
IN VENTOR
WILL/AM J THOMPSON
BY
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“A?
' ATTO
NE_Y
3,033,954
a
United States. Patent- 0 ” IC€
1
3,033,954
Wiliiam J. Thompson, Cold Spring Harbor, N.Y., assignor
ROTARY SPEED RESPONSIVE SWITCH DEVICE
to Sperry Rand Corporation, Great Neck, N.Y., a cor
poration of Delaware
Filed Mar. 22, 196i}, Ser. No. 16,730
4 Claims. (Cl. ?ll-80)
This invention relates to a device for actuating a switch
Patented May 8, 1962
2
disc 15.
Preferably, the screw 16 is plastic and has one
extremity rounded to provide substantially point contact
where it abuts against a circular conductive wobble ring
20. The other extremity of the screw 16 is slotted in
order that it may be manually screwed in‘ and out of
the disc 15 for varying the distance which the screw 16
projects beyond the disc 15 which in turn varies the am
plitude of the wobble in a direction parallel to the axis
11 introduced ,to the wobble ring 20, in a manner to be
in response to the rotary speed of a rotating body.
10 more fully explained.
The present invention is an improvement over prior
The wobble ring 24) is pivotally mounted to wobble
art. devices of this type primarily because the center of
but is prevented from rotating around the axis 11, by
gravity of the speed responsive element does not undergo
means of a circular gimbal 21 and pivots 22, 2A2’, 23 and
a change in relative position during operation of the
23’. The gimbal 21 is mounted on the ?xed support
device. The operation of the device is independent of
member 12 for pivotal movement about an axis 24 by
linear vibrations and may be subjected to high external
means of the spaced pivots 22 and 22'. The wobble
acceleration forces without effecting the operation of the
ring 20 is in turn mounted on the gimbal 21 for pivotal
device. Further, the device is relatively simple mechani
movement about an axis 25 by means of the spaced pivots
cally, rugged and capable of accurate operation under
23 and ‘23'. The axes 2-4 and 25 are mutually perpen
severe vibration conditions while at the same time it may
dicular with respect to each other and with respect to’
be designed to be extremely small and light weight.
the axis 11 at a point 26. Thus, the wobble ring 20- is
Further, it is capable of being designed to operate over
free to wobble in all quadrants de?ned by the axes 245
an unusually wide range of speed.
and 25 but is constrained from rotating around the axis
It is a primary object of the present invention to pro
11. By this arrangement, the center of gravity of the‘
vide a rotary speed responsive switch device that is oper 25 wobble ring 2% at point "26 remains ?xed at this point;
able under adverse environmental conditions.
A circular conductive switch ring 3% is rigidly mounted
It is a further object of the present invention to pro
on the support member 12 in spaced cooperative rela
vide a rotary speed responsive device that is operable to
tion with respect to the wobble ring 2d. The switch ring
provide actuation of a switch at a predetermined rotary
30 forms one contact of an electrical switch while the‘
speed which is simple, compact and reliable under adverse 30 other contact is formed by the wobble ring 20. With the
operating conditions, particularly, severe vibration.
shaft 19 at rest, the wobble ring 20 and the switch ring
The above objects are achieved by the rotary speed
30 are spaced with respect to each other and are out of
responsive switch device of the present invention which
contact with each other as shown in FIG. 1 thereby form
comprises a support member, a rotatable body mounted
ing a normally-open switch device.
‘
for rotation with respect to said support member, a switch
Four helical springs 31, 32, 33 and 34 are disposed
ring mounted on said support member and forming one
90° apart around the periphery of the wobby ring 20
contact of an electrical switch, a wobble ring mounted
on said support member for pivotal movement about two
perpendicular axes and forming the other contact of the
and each has an extremity connected to the wobble ring
29 and another extremity connected to the support mem~
ber 12. An electrical lead 35 connects to one extremity
electrical switch, said wobble ring being cooperative with 40 of the helical spring 31 thereby providing electricity to
the wobble ring 2i? through the spring 31. An electrical
said switch ring, and an actuating arm mounted on said
rotating body and rotatable therewith tending to sequen
lead 36 connects to the switch ring 30 on the side oppo
tially depress elemental portions of said wobble ring in
site that facing the wobble ring 20 thereby providing
accordance with the rotary speed of said body whereby
electricity to the switch ring 30. The leads 35 and 36
45
below a predetermined rotary speed of said body the
may be connected to a source of electrical energy not
wobble ring is in a ?rst predetermined condition and at
shown.
‘
said predetermined rotary speed of said body the wobble
A housing comprising a base 40 and a cover 41 may
ring is in a second predetermined condition for effecting
enclose the aforementioned elements to prevent contami
the operation of said switch.
nation thereof. The ‘base 40 may also be provided with
Referring to the drawings,
screw holes as shown in FIG. 2 for attachment to a chassis
FIG. 1 is a sectional view of a preferred embodiment
not shown.
In operation, with the shaft 10 at rest, the screw 16‘
of the present invention;
‘
abuts against the wobble ring 20 and causes the wobble
FIG. 2 is an end view partially in section of the device
55 ring 20 to assume the canted position shown in FIG. 1
of FIG. 1 taken along lines 2—2 thereof;
of a normally-open rotary speed responsive switch device
FIG. 3 is an alternative embodiment of a normally
with the spring 31 compressed and the spring 33 extended.
The electrical switch is open since the wobble ring 20
closed rotary speed responsive switch device of the pres
does not contact the switch ring 39. As the shaft 10
ent invention;
begins to rotate, only the disc 15 and the screw 16 rotate
FIG. 4 is an end view partially in section of the device '
60 with it while all the elements mounted on the ?xed sup
of FIG. 3 taken along lines 4—4 thereof; and
port member 12 remain stationary except for wobble of
FIG. 5 is a schematic 'end view of the device of FIG.
the wobble ring 2%}. As the screw 16 rotates and rubs
3 taken along lines 4—4 for illustrating the operation
against the wobble ring 20, the screw 16 causes wob
thereof.
ble or mutation of the wobble ring 20 ‘by sequentially‘
Referring to FIGS. 1 ‘and 2, a rotating body in the
depressing elemental portions of the wobble ring 20.
form of a shaft 10 is mounted for rotation about an axis 65 The amplitude of the wobble of the wobble ring 20 in
11 with respect to a ?xed, non-conductive support mem
a direction parallel to the axis 11 as determined by thev
ber 12 by means of spaced bearings 13 and 14. The
position of the screw 16 is preferably maintained small
shaft 10 is rotated by means not shown. A disc ‘15 is
in order that the wobble ring 2% and the switch ring 30
connected to an extremity of the shaft 10 for rotation
remain out of contact with each other below a predeter~
70
therewith about the axis 11. At a point near the periph~
mined rotary speed of the shaft 16.
cry of the disc 15 a depressor element in the form of a
At a predetermined rotary speed of the shaft 10, the
screw 16 is threadedly connected to project through the
combination of the springs 31, 32, 33 and 34 and the mass
3,033,954
3
4
of the wobble ring 20 reaches its natural frequency. At
this resonant condition, the amplitude of the de?ections
of the wobble ring Ztl become much greater than that in
trical switch while the other contact is formed by the
Switch ring 30, the latter receiving electricity through the
duced by the action of the screw 16 below resonance and
lead 36 which is connected thereto. Electricity is sup
plied to the wobble ringpZtl by means of the lead 35 which
the wobble ring 20 contacts the switch ring 3%) thereby‘
in this embodiment is connected to a conductive ring 54
that is securely mounted on the non-conductive support
closing the electrical switch. The large de?ections of the
wobble ring 21} at the resonant condition cause it to con
' member 12 and forms the supporting structure for the
pivots 22 and 22’. Electricity is privided to the wobble
tinuously contact the switch ring 39 thus maintaining the
ring 20 by means of lead 35, ring 54, pivots 2,2 and 212',
switch closed.
This condition of continuous contact between the wob
ble ring 24} and the switch ring 30' is maintained for speeds
10
gimbal 21 and pivots 23 and 23'.
In this embodiment, the wobble ring 20 contacts the
switch ring 30 due to the resilient force applied by the
spring 51 and the depressor 52 thus maintaining the
electrical switch closed when the shaft 10 is at rest or
the electrical contact point between the wobble ring 29 15 below a predetermined rotary speed. As the shaft Ill
begins to rotate, the depressor 52 rotates with it and tends
and the switch ring 3t} by a substantially constant angle
to sequentially depress elemental portions of the wobble
of slightly less than 90°. As the screw 16 rotates, it con~
ring 20‘ causing the wobble ring 20 to contact the switch
‘ tinually exerts a force normal to the wobble ring 20 at
ring 30 during 360° of rotation of the shaft 10.
its point of contact with the wobble ring 20. This nor:
As shown in FIGS. 3 and 5, at very low rotary speeds
mal force at any instant of time tends to depress the
of the shaft 10, the location of the point of contact A
wobble ring 20 and at and above resonance tends to rotate
of the depressor 52 on the wobble ring 23 substantially
the wobble ring 29 about its electrical point of contact
coincides with the point of contact B between the wobble
with the switch ring 30 which electrical point of contact
ring 2% and the switch ring 30. At higher rotary speeds
is itself continuously rotating. Above resonant speeds this
normal force increases as required to accelerate the wob 25 of the shaft 10, the point of contact A of the depressor
52 leads the point of contact B between the wobble ring
his motion and overcome inertia of the Wobble ring 20
20 and the switch ring 30 due to the inertia of the wobble
by means of the rigid construction of the disc 15 and the
ring 20.. For example, with the shaft Ill rotating at a
screw 16. Thus, the desired switching action is accom
relatively high speed in a clockwise direction as shown in
plished with the switch open below a predetermined rotary
speed of the shaft It} and the switch closed above a pre 30 FIG. 5 and the depressor 52, as shown in dotted lines,
contacting the wobble ring 20 at point A’, the contact
determined rotary speed of the shaft 11a.
point B’ of the wobble ring 20 and the switch ring 30
Although FIG. 1 shows for purposes of explanation
lags the point A’ by approximately 45° because the in-.
the Wobble ring 20 canted at an appreciable angle, in
ertia of the wobble ring 20 prevents it from following
actualtpractice it has been found that the wobble induced
what are effectively the impulses of the spring loaded dc
by the screw 16 should be relatively small and the air gap
above resonance. At resonance the wobble motion is
provided as explained previously and the point of con,
tact between the screw 16 and the Wobble ring 20 leads
between the contacts should be comparatively large in
pressor 52.
order that contact between the wobble ring 20‘ and the
At a predetermined rotary speed of the shaft 16, the
inertia of the wobble ring 20 prevents it from following
switch ring 3% is made only at and above resonance and
does not occur due to wobble occurring before reso
nance. It will be appreciated that as the wobble ring 20
wobbles, its center of gravity at point 26 is not subject
to change in relation to the rest of the mechanism, there
fore it is not affected by linear vibrations thus permitting
the device to be used Where severe vibrations are en
'
the action of the depressor 52 to such an extent that the
wobble ring 20 does not contact the switch ring 3d‘ dur
ing a complete revolution of the shaft 10. At this critical
speed with the Wobble ring 20 entirely out of contact with
the switch ring 30, the electrical switch is opened thereby
providing a normally-closed rotary vspeed sensitive switch
countered without undesirable intermittent operation. 45 that opens and remains open above a predetermined criti
cal speed. The inertia of the mass 20 and the resilient
Further, in practice it has been found that utilizing a
force applied by the spring loaded depressor 52 are de
plastic screw 16 with a leaded Phosphor bronze wobble
signed to provide the desired action at the predetermined
ring 20 and a sterling silver plated switch ring 30 has re
sulted in very little wear occurring. The device can be
made extremely compact and light weight, for example,
critical speed.
The normally-closed switch of FIG. 3 includes all of
the advantages described above with respect to the device
of FIG. 1.
small as an inch and one-quarter in diameter.
While the invention has been described in its preferred
Referring now to FIGS. 3 and 4, an alternative em
bodiment of the device will be described incorporating the
embodiments, it is to be understood that the words which
principles of the present invention with respect to a nor 55 have been used are words of description rather than of
limitation and that changes within the purview of the
mally-closed switch. Like parts are indicated by like
appended claims may be made without departing from the
reference characters and for purposes of simplicity only
true scope and spirit of the invention in its broader aspects.
the new elements will be described.
What is claimed‘ is:
A bracket 50 is threadedly connected to an extremity
1. A device which is operably responsive to the rotary
of the shaft 10 for rotation therewith. Mounted on the 60
speed of a body ‘to. actuate a switch, comprising a support
bracket 50 for providing a resilient force against the peg
member, said body being mounted for rotation with re
riphery of the wobble ring 20 is a spring member 51 hav
ing a plastic depressor 52 mounted thereon for abutting
spect to said support member about an axis of rotation, a
?rst circular element of conductive material mounted on
against the Wobble ring 20. Preferably, the member 51
is a flat circular spring having a central opening 53 which 65 said support member and forming one contact of said
permits the shaft 10' and portions of the support mem~
switch, a second circular element of conductive material
cooperative with said ?rst element and forming the other
ber 12 to project theret-hrough. The spring 51 is con
contact of said switch, means including gimbal means
nected to the bracket Si} by means of rivets 55- or other
mounted on said support member and pivotally supporting
suitable connecting means. The magnitude of the applied
said second element ‘for pivotal movement about two
resilient force may be varied by positioning the bracket 50
mutually perpendicular axes that are also perpendicular
on the threaded end of the shaft 10‘ along the axis 11.
to said axis of rotation, and actuating means mounted for
The bracket 50 is locked in place by means of a con—
ventional split yoke and screw arrangement.
rotation with said rotating body tending to sequentially de
As described above with respect to the embodiment of
press elemental portions of said second element in accord
FIG. 1, the wobble ring 20 forms one contact of an elec
ance with the rotary speed of said body whereby below a
successful results have been obtained from devices as
5
3,033,954
predetermined rotary speed of said body the second ele
ment is in a ?rst predetermined condition and at said pre
determined rotary speed of said body the second element
is in a second predetermined condition for effecting the
operation of said switch.
2. A device which is operably responsive to the rotary
speed of a body to actuate an electrical switch, comprising
a support member, said body being mounted for rotation
with respect to said support member about a ?rst axis, a
switch ring mounted on said support member and form
ing one contact of an electrical switch, a wobble ring, said
wobble ring forming the other contact of the electrical
switch and being cooperative with said switch ring, means
including gimbal means mounted on said support member
6
ble ring is in a second predetermined condition for effect
ing the operation of said switch.
3. A device as claimed in claim 2 wherein said actuat
ing means is resiliently mounted on said rotating body and
applies a resilient force against said wobble ring wherein
in said ?rst predetermined condition said wobble ring con
tacts said switch ring and in said second predetermined
condition the inertia of said wobble ring prevents it from
following the resilient force applied by said actuating
means to an extent that said wobble ring does not contact
said switch ring.
4. A device as claimed in claim 2 including resilient
means connected to said support member and said wob
ble ring for preventing said ‘wobble ring from contacting
and pivotally' supporting said wobble ring for pivotal 15 said switch ring at said ?rst predetermined condition, and
movement about two mutually perpendicular axes that
are also perpendicular to said ?rst axis, and actuating
means mounted for rotation with said rotating body tend
ing to sequentially depress elemental portions of said wob
ble ring in accordance with the rotary speed of said body
whereby below a predetermined rotary speed of said body
the wobble ring is in a ?rst predetermined condition and
at said predetermined rotary speed of said body the wob
at said second predetermined condition the natural fre
quency of the wobble ring and the resilient means causes
said wobble ring to contact said switch ring.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,984,512
2,691,516
Anderson ____________ __Dec. 18, 1934
Fischer ______________ __ Oct. 12, 1954
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