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Патент USA US2136252

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Nov. 8, 1938.
c. A. RASMUSSEN
I
2,136,252
SPEED RESPONSIVE ELECTRICAL CONTACTOR
Filed larch 4, 1935
2 Sheets-Sheet 2
INVENTOR.
ATTORNEY.
2,136,252
Patented Nov. 8, 1938
UNITED STATES
PATENT OFFICE
2,136,252
SPEED RESPONSIVE ELECTRICAL
CONTACTOR
Christian A. Rasmussen, Cleveland, Ohio
Application March 4, 1935, Serial No. 9,244
10 Claims.
This invention relates to electrical contactors
and more particularly to electrical contactors ar
ranged to be driven by power and responding by
the action of centrifugal force to the speed of the
5 power source.
It is among the objects of the invention to pro
vide:
An improved motor drivable electric switch
operable responsive to speed of the motor;
10
An improved electric switch employing the
principle of centrifugal force, to operate it;
An improved motor drivable electric switch re
sponsive to motor speed and having improved ad~
justment means to adjust its response to the speed
15 of the motor.
Other objects will be apparent to those skilled
in the art to which my invention appertains.
My invention is fully disclosed in the following
description taken in connection with the accom
panying drawings, in which:
Fig. 1 is a longitudinal sectional view of a
switch apparatus embodying my invention;
Fig. 2 is a cross-sectional view taken approxi
mately from the plane li~ll of Fig. 1;
(Cl. 200-80)
against the yielding pressure of a spring I93 tele
scoped. on the shaft, abutting at one end upon
the head I02 and at the other end upon a block
I04 longitudinally adjustably secured to the shaft
5
to vary the tension of the spring.
The head I02 has a sleeve, preferably integral
therewith, upon which is press-?tted the inner
raceway I06 of a ball bearing. The outer race
way I0'l of the bearing is telescoped into the an
nular wall of a cup-shaped element M8, the cup
bottom I09 of which is perforated to encircle
the shaft 95. The cup member I09 is retained
in place on the outer raceway element byv a sleeve
I I0 telescoped over the element I00 and having a
radially extending flange I I I overlapping the
raceway. A bracket Il2 has one leg H3 thereof
secured to the-element I00 by a screw I I4 extend
ing through the leg H3 and through the sleeve
H0 and into the element I08, the other leg H5
of the bracket being bent to extend transversely 20
of the shaft and having a perforation encircling
the shaft.
A channel-shaped element IIS has the web of
the channel II?I encircling the shaft, and the
Fig. 3 is a fragmentary plan View taken ap
proximately from the plane 5 of Fig. 1;
flanges IIO of the channel extend substantially
parallel to the shaft, spaced therefrom, and the
Fig. 4 is a fragmentary view similar to a part of
Fig. 1 but taken from a plane at right angles to
outer ends thereof are bent over into feet II9?
that of Fig. 1;
insulating material.
Fig. 5 is a fragmentary view similar to Fig. 1
illustrating a switch device embodying my inven~
tion in another form;
Fig. 6 is a longitudinal sectional view of some
of the parts of Fig. 5, the view being taken from a
35 plane at right angles to that of Fig. 5;
Fig. 7 is a cross-sectional View taken approxi
mately from the plane 9?9 of Fig. 6.
Referring to the drawings Figs. 1 to 4, at 90 is
shown a housing having end members SI and 92
40 in which are seated ball bearings 93 and 94 ro
tatably supporting a shaft 95 having secured
thereto a driving pulley 96 illustrated as of the
grooved type but which may be of any suitable
type.
The shaft 95 is adapted to be rotatably
45 driven by a belt on the pulley 96 belted to a suita
ble pulley on a driving motor.
A yoke 01 secured to the shaft 95 in any suit
able manner such as by a screw 98, has pivoted
thereto at opposite ends spaced from the shaft
95, centrifugal balls 99?99 to which are pivoted
at one end links I00-I00 the opposite ends of
H9, and to the feet I I9 is secured a panel I20 of
The feet II9 are secured to the panel by bolts
I2I?I2I projected therethrough and the open
end of the channel thus provided is stiffened by
a bridging member 122 of sheet metal secured by
the same bolts I2I and encircling the shaft. The
panel I20 has a deep notch 235 in which are dis
shaft abutting at one end upon the leg I I5 and at
the other end upon the web portion Ill of the
channel. Initial tension in the spring I23, if pro
vided, will tend to thrust the cup bottom I09 to
ward the left as viewed in Fig. 1 by reacting 45
through the bracket H2 and tend to thrust the
channel web II?I toward the right as viewed in
Fig. 1, and the thrust may be taken by a washer
I24 disposed between the parts II?! and I09 just
50
referred to.
The panel I20 has a pair of contacts l25?-I25
which are pivoted as at IOI?IOI to a head I02.
thereon, secured by bolts I26 projected through
Upon rotation of the shaft 95, the balls 99?99
will move outwardly radially and will draw the
the panel, the contacts being connected by a wire
4 extending across the panel. The panel is sup
ported by the bridging member I22 on the shaft
55 head I02 toward the right as viewed in Fig. 1
35
posed the shaft and the channel legs IlB-IIB
and bracket legs II2 as shown in Fig. 2, the
bridging member I22 therefor also reinforcing the
panel I20.
A compression spring 223 is telescoped on the
2
2,136,252
and by the web portion I I1 of the channel on the
shaft.
The member 02 of the housing has a bracket
I21 extending therefrom and a contact sup
port I28 of insulating material is supported there
by and has a groove :29 therein by which the
support I28 may be shifted on the bracket I21
I25-I25 to vary the instant of breaking. This
may be done by moving the contact support I20
along the bracket I21 adjustably and ?xing its
position by the screw I 3I. In any position of
the contacts 5?5, they are insured of engage
ment by the contacts I25 because of the relatively
greater movement of the bracket II2 than the
longitudinally of the shaft and spaced therefrom.
panel I20 and the compression of the spring I23,
The support I28 has a slot I30 therein and a screw
which cushions the panel I 20.
In the embodiment of my invention illustrated 10
I3I is projected through the slot and into the
bracket I21 to ?x the support � in any longi
tudinally adjusted position.
Depending from the support 420 is a pair of
contact ?ngers I32 and I33 of metal, secured to
the support by screws I34 projected therein'to
' through the support.
Each ?nger has a contact
5 thereon and the ?ngers are disposed so that the
contacts 5 are opposite the contacts #25 above
mentioned. Each ?nger has a terminal screw I35
thereon to which electric connection may be
made, and the ?nger 232 has a wire 35 connected
thereto, and the ?nger 533 has a wire 31 connected
thereto by the screws I35. The wires
and 31
are part of an electric system or circuit to be con
trolled.
The panel 520 has edge portions I35-I3?5 dis
posed under and adjacent to the underside of the
support � whereby rotation of the panel when
the shaft 95 rotates is prevented, the edges E30
iii) engaging the support � in either direction of
rotation.
In the operation of the switch device above de
scribed, when the shaft 95 is rotatably given at
speed above a predetermined amount by the mo
tor to which it is belted, the centrifugal balls 99
move outwardly radially and draw the bearings
506-551, together with the element I08 and
bracket H2, toward the right as viewed in the
drawings. The spring I 23 is moved along the
shaft by the leg I i5 and moves with it the chan
nel-shaped element H6 which correspondingly
moves the panel �, carrying the contacts I25?
I25 with it.
By this movement, the contacts I25 are brought
into engagement with the contacts 5?5, closing
a circuit from the wire 36 through the contacts
and the bridging connection 4 and out at the
wire 31.
After the contacts I25 and 5 have been en
gaged, the balls 99 may continue to move farther
outwardly, moving the bracket ! I2 farther toward
the right as viewed in Fig. 1. Thereupon the
contacts I25 and 5 will be held in resilient engage
ment by compression of the spring I23, the chan
nel-shaped element I I6 being prevented from fur
ther movement by stopping of the panel I20 by the
contact engagement, and the leg II5 moving
toward the right, away from the panel I20, com
pressing the spring upon the web I !1 of the chan
nel element IIB.
Thus the bracket I I2 may have a greater move
ment than the panel I20.
When the motor slows down to speeds below a
predetermined speed, the shaft 05 is thereby
65 slowed down, the balls 99 are retracted by the
spring I03 and ultimately the cup bottom I09
engages the channel web I I1 (or the thrust washer
I24 therebetween) and the panel I20 is moved
thereby toward the left as viewed in the draw
70 ings, and ultimately engagement of the contacts
5 and I25 is broken.
In order to insure that the circuit comprising
the wires 36 and 31 will be broken at a precise
slowing down speed of the motor, the contacts
75 5?5 may be moved toward or from the contacts
in Figs. 5 to '1 inclusive, I have shown at 200 a
shaft, at 20I a spring and at 202 links similar to
the corresponding parts of Fig. 1, the links 202
being pivoted to a head 203 provided with a
tubular portion 204 upon which is pressed the
inner raceway 205 of a ball bearing having an
outer raceway 200 on which is secured a ring
201.
As shown in Fig. 5, a yoke 208 is secured at
one end to the ring 201, extends longitudinally 20
along the shaft, and at a point spaced from the
ring encircles the shaft. A panel 209 of insu
lating material is perforated as at 2I0 to admit
the shaft therethrough. A plate 2| I is secured
on one side of the panel 209 and a compression 25
spring 2I2, telescoped over the shaft, abuts at
one end upon the plate 2H and at the other end
upon the encircling portion 2I3 of the yoke 208.
A friction washer H4 is ?tted on the sleeve 204
of the head 203, abutting upon the inner raceway 30
205, and is adapted to be frictionally engaged by
a washer 2I5 telescoped on the shaft and dis
posed between the washer 2 I4 and the panel 200;
and by the construction illustrated and just de
scribed, it will be apparent that the two friction 35
washers 2I5 and 2M are normally held in pres
sure engagement by the spring 2I2.
The plate 2I I is perforated at spaced points on
opposite sides of the shaft 200, and a pair of
pins 2I6?-2I6 both parallel to the shaft are pro 40
jected through these perforations and secured in
the ring 201 and function as supports and guides
for the panel 209.
The panel 209 has a pair of contacts 2I1?2I1
connected by a wire 54. Above the shaft 200 as 45
viewed in Fig. 5 is a bracket 2I8 upon which is
slidably adjustably mounted a support 2I9, the
construction of the bracket and support prefer~
ably being similar to the bracket I21 and the sup
port I28 described in connection with Figs. 1 to 4. 50
Depending from the support 2 I 0 is a pair of posts
220 and 22I secured to the support by screws 232,
the posts being preferably formed from insulat
ing material.
The post 220 has a pair of contacts 56 and 55
thereon, one above the other (see Fig. '7), having
portions confronting the contacts 2I1 and having
portions on the opposite side of the post 220 in
which connection screws 222 are provided to se
cure circuit wires 11 and 86 to the contacts. The
post 22I likewise has a pair of contacts 223-223
supported thereby, having portions confronting
the contacts 2 I1 and portions on the other side of
the post for receiving screws 224, one of the
65
screws having a wire 1I secured thereto and being
connected to the other screw by a bridging wire
215.
The panel 200 has upwardly extending abut
ments 225 and 226 spaced from the underside 70
of the contact support ZIS; and, by the con
struction above described, it will now be clear
that the panel may oscillate around the shaft
200, supported by the pins 2I6 on the ball bear
ing, and in each direction of oscillation will be 75
3
2,136,252?
stopped by engagement of the abutments 225
and 226 with the support 219.
The stationary contacts 56 and 55 in one pair
and 223?223 in the other pair, are disposed so
that when the panel 209 is oscillated in one di
rection, for example clockwise as viewed in Fig.
'7, its contacts 2ll-?2l1 will be confrontingly op
posite the contact 55 and one of the contacts
223; and when oscillated to the limit of move
10 ment in the other direction, its contacts will be
confrontingly opposite the contact 56 and the
other of the contacts 223.
In the operation of the form of? Figs. 5 to 7,
above described, when the shaft 200 is rotated
15 by the motor in either direction, at the instant,
of starting to turn, rotational movement of the
head 203 will be transmitted through the pres
sure-engaged friction washers 2M and H5, to
the panel 209, oscillating it to one or the other
20 of its stopped positions. Continued rotation of
the shaft will cause the friction washer to ?slip
or drag one upon the other holding the panel
prising a rotary and axially movable element,
a friction element rotatable with the rotary ele
ment, a pair of stationary contacts, an oscil
latable contact support having limited oscillatory
movement carrying a contact oscillatably mov C21
able therewith into confronting relation to the
stationary contacts selectively, the contact sup
port being movable axially, spring means tend
ing to move it axially and normally holding it
in frictional relation to the friction element, the 10
parts being arranged so? that upon initiation of
rotation of the rotary element in one direction
or the other the contact support will be fric
tionally driven and oscillated in the correspond
ing direction to selectively confront a stationary
contact with the movable contact and so that
upon rise of rotational speed to a predetermined
value the rotational element will move axially
to discontinue frictional drive and withdraw the
rotary element axially and the spring means 20
will then move the contact support to engage
the confronting contacts.
in its stopped position. Further rotation of the
shaft in speeding up will retract the head 203
3. In a switch construction, a main frame, a
centrifugal device on the frame comprising a
25 against the spring 20! and draw the panel along
toward the right as viewed in Figs. 5 and 6 to
engage the contact 2H with contacts on the
inner raceway and a friction element rotatable
posts 220 and 22!, and thereafter will retract the
head 283 still farther, removing the pressure
30 from the friction washers and compressing the
spring 2l2 and holding the contacts engaged by
the spring pressure thereof and substantially
without sliding friction in any of the parts, the
relative rotary movement being taken in the ball
35 bearing.
If the rotation of the shaft 20!! be clockwise
as viewed in Fig. '7, the engagement of the con
tacts will connect the wire 86 with the wire ?H,
and if it be in the other direction will connect
40 the wire ?I1 with the wire ?II. When the motor
slows down and the shaft 200 reduces in speed,
the head 203 will be moved toward the left as
viewed in the drawings and ultimately will move
the panel 209, upon engagement of the friction
to disengage the engaged contacts.
45 washers,
The wires 11, 86 and ?II referred to are part
of a circuit or system to be controlled.
The instant of breaking the contact engage
ment can be adjusted by adjustably moving the
50
contact posts 220 and 221 by adjustably moving
the support 219 on the bracket 2l8.
My invention is not limited to the exact de
tails of construction of electrical switch shown
and described. Many changes and modi?cations
55 may be made within the spirit of my invention
without sacri?cing its advantages and within the
scope of the appended claims.
I claim:
1. In an electric switch construction, a main
60 support, a rotary centrifugal device on the sup
port adapted to be driven at variable speed, and
comprising a speed-responsive movable element,
a pair of stationary contacts and a reciprocably
movable contact supported on the frame, means
65 causing the movable contact to move into con
fronting relation to one of the stationary con
tacts selectively in correspondence with change
of rotational direction, said means comprising
frictional drive means operative at rotary speeds
70 below a predetermined speed only and the cen
trifugal device comprising axially movable means
for moving the confronting contacts into en
gagement at a predetermined rotational speed.
2. In a centrifugal switch construction, a main
75 frame, a centrifugal device on the frame com
rotary and axially movable element, a ball bear
ing comprising inner and outer raceways, the
with the rotary element, a pair of stationary con
tacts, an oscillatory contact support having
limited oscillatory movement and carrying a con
tact oscillatably movable therewith into con
fronting relation to the stationary contacts selec
tively, the contact support being axially movably
supported by the outer raceway, spring means
tending to move it axially reacting on the oscil
latory support and on the outer raceway and
holding it in frictional relation to the friction ele
ment, the parts being arranged so. that upon
initiation of rotation of the rotary element in one
direction or the other, the contact support will 40
be frictionally driven and oscillated in the corre
sponding direction to selectively confront a sta
tionary contact with the movable contact and so
that upon rise of rotational speed to a predeter
mined value the rotational element will move 45
axially to discontinue frictional drive and with
draw the rotary element axially and the spring
means will then move the contact support to en
gage the confronting contacts.
4. In a centrifugal electric switch, a centrifugal 50
device comprising a rotary element movable
axially at changes of rotational speed above a
predetermined speed, a ball bearing comprising
an inner raceway supported by the? rotary ele?
ment, an axially extending arm supported by the 55
outer raceway, an axially movable contact sup
port, a spring reacting on a portion of the arm
and on the contact support tending to move the
contact support toward the rotary element and
the rotary element normally obstructing move 60
ment thereof, a stationary contact confronting
the movable contact, the parts being arranged
so that uponv rotation of the device above a pre
determined speed the rotary element will be with
drawn axially and axial movement of the outer 65
raceway will be transmitted through the arm
and spring to the contact support and will move
it to engage the contacts and upon further in
crease of speed the spring will yield to cushion
70
the contact engagement.
5. The swich construction described in claim 2
and in which the stationary contacts are ad
justably movable axially to adjustably vary the
said predetermined engagement speed.
6. The switch construction described in claim 3
4
2,136,252
and in which the stationary contacts are ad
justably movable axially to adjustably vary the
predetermined speed of contact engagement.
IS!
7. The switch construction described in claim 4
and in which the stationary contact is adjustably
movable axially to adjustably vary the predeter
mined speed.
8. In centrifugally operated switch construc
tion, a centrifugal device comprising a rotary shaft
and an element rotatable with the shaft and
movable axially thereon responsive to speed
changes above a predetermined speed, a ball
bearing comprising inner and outer raceways and
balls thereon, the inner raceway being secured to
the said rotary element, and disposed co-axially
of the shaft, a contact carrying element having
a perforation therein through which the shaft
extends, guide means supported by the outer
raceway upon which the contact carrying ele
ment may reciprocate in the axial direction, a
friction element surrounding the shaft, secured
to the rotary element to rotate therewith and hav
ing friction engagement with the contact carry
ing element, a spring surrounding the shaft and
abutting at one end upon the contact carrying
element on the side thereof opposite to the fric
tion element, a hanger having a portion sur
rounding the shaft upon which the other end of
the spring abuts and said portion being con
30 nected to the outer raceway by arms bridging op
posite portions of the contact carrying element,
a pair of stationary contacts, a contact on the
contact carrying element, the contact carrying
element being oscillatable with the outer race
way to position the said contacts in confronting
relation to the stationary contacts selectively, stop
means for stopping oscillation of the contact
carrying element in said positions, the rotary ele
ment upon initiation of rotation thereof in either
L.)
direction, driving the contact carrying element
by friction of said friction element to oscillate it
in one direction or the other and upon the attain
ment of a predetermined speed moving axially to
move the stationary contact into engagement
with the rotationally selected stationary contact
and then withdrawing to discontinue the friction
driving and spring-pressing the engaged con
tacts together.
9. In an electric switch construction, a main
support, a rotary centrifugal device on the sup
port adapted to be driven at variable speeds and UK
comprising a speed-responsive movable element,
a binary contact comprising a pair of contact ele
ments, and a single contact, one contact being
stationarily supported and the other reciprocably
movably supported on the frame, means causing 10
the movable one of the contacts to move to effect
confronting relation between the single contact
and one of the pair of contact elements selec
tively in correspondence with change of rota
tional direction, said means comprising frictional 15
drive means operative at rotational speeds below
a predetermined speed only and the centrifugal
device comprising axially movable means for
moving the confronting contacts into engage
ment at a predetermined rotational speed.
20
I
.
.
.
10. In a centrifugal electric switch, a centrif
ugal device comprising a rotary element movable
axially at changes of rotational speed above a
predetermined speed, a non-rotatively supported
element having thrust bearing on the rotary ele 25
ment and movable axially thereby, the non-rota
tive element comprising an axial extension, an
axially movable contact support and a contact
supported thereby and movable therewith, a
spring reacting on a portion of the extension and
on the contact support tending to move the con
tact support toward a portion of the non-rota
tively supported element and its movement being
normally obstructed thereby, a stationary con
tact support and a contact supported thereby 35
confronting the movable contact, the parts being
arranged so that upon rotation of the device
above a predetermined speed the rotary element
and the non-rotative element will be moved
axially and axial movement of the non-rotative
element will be transmitted through the exten
sion and spring to the contact support and will
move it to engage the contacts and upon further
increase of speed the spring will yield to cushion
the contact engagement.
CHRISTIAN A. RASMUSSEN.
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