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Патент USA US2077192

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April 13, 1937.
Original Filed Aug. 20, 1931
Reginald G. Sbanderwick,
by Wa/wZéi?W/M
The? Attorney
Patented Apr. 13, 1937
Donald F. Warner, Lynn, and Reginald G. Stan
derwick, Marblehead, Mass, assignors to Gen
eral Electric Company, a corporation of New
Original application August 20, 1931, Serial No.
558,339. Patent No. 2,020,977, dated November
12, 1935. Divided and this application May 11,
1935, Serial No. 21,052
2 Claims. (Cl. 200--80)
The present invention relates to emergency 23 is provided with a conical bearing seat 25 with
speed governors and has for its object an improved which engages a bearing cone 28 carried on one
construction of such governors to permit ad
end of a tube
The other end of the tube 21 is
justment during operation. This application is a slidably mounted in a washer 28 of insulating ma
5 division of our application, Serial No. 558,339, ?led terial held in a sleeve or cylinder 29. Located be
August 20, 1931 now Patent 2,020,977 November tween the washer 28 and a flange on the tube 21 is
12, 1935 on speed control mechanism. In said ap
plication we disclose a speed control mechanism
for controlling and limiting the speed of a motor,
10 which mechanism includes a speed controlling
element, a speed limiting element and means for
automatically adjusting one of the elements in
response to adjustment of the other element. To
a governor spring 30 which presses the bearing
cone 25 against the seat 25. The sleeve 29 is slid
ably mounted in a
ring or contact cylinder 3|
formed integral with the yoke 2?, that is electri 10
cally connected to the latter. Mounted on the
slip ring Si is a second slip ring or contact cylinder
32 insulated therefrom by an insulating sleeve 33.
make this clear, let us assume we have a motor
During operation, spindle l9, yoke 2i, governor
15 provided with a speed-controlling element or
speed governor setting the motor speed to 1000
R. P. M. and a speed-limiting element or emer
gency speed governor set to disconnect the motor
or interrupt its operation as. its speed reaches a
maximum value, for instance, 1200 R. P. M. In
our parent application we disclose means whereby
a change of the setting of the speed-controlling
element to 1300 R. P. M., for instance, causes au
weight 22, tube 21, sleeve 20 and cylinders 3i and
tomatically setting of the speed limiting element
25 to operate at 1500 R. P. M.
A speed-limiting element or emergency speed
governor of this kind must meet two requirements.
It must be connectible to a speed-controlling ele
ment or speed governor and it must be adjustable
30 during operation.
The single ?gure in the accompanying drawing
32 rotate as a unit with the shaft l8. This rotat
ing unit is located in a casing 34, the inner end
of which is fastened to the end of a frame 35 of
the drive motor. Mounted on the casing 34 are
contact brushes 3% and 36:: which engage slip rings
El and 32 respectively. In the end of the sleeve 29
is a thrust bearing ball 31 with which engages a
rod member 33. The latter is adjustable in axial
direction of the motor shaft. It may be connected
to a speed governor as described in our parent ap
plication. With a certain adjustment the rod 38 25
causes a de?nite compression of the governor
spring 30.
The circuit for the operating coil of the relay
it is formed through the brush 35a, the outer ring
32, the ?yweight 2d, the yoke 2 I, the inner ring 3| 30
shows an emergency speed governor in accord
ance with our invention. In this embodiment the
speed governor is arranged to operate with a hold
and the brush 36. The circuit is closed as long as
the contact’arm 24 of the flyweight engages the
35 ing relay I6 which normally is energized to hold
tain maximum value, the centrifugal force acting
closed a switch ll forming a part of a motor cir
cuit (not shown). The relay It has a coil con~
nected to an electric source 10 through the inter
. mediary of the emergency governor. The latter is
40 driven by a shaft l8 forming a part of a variable
' speed motor (not shown). As the speed of the
motor reaches a certain maximum value, the gov
ernor interrupts the circuit for the energizing
coil of the holding relay i6 which in turn permits
45 the switch I‘! to open by the action of a spring i I.
The emergency governor comprises a spindle it
which is ?xed in an opening in the end of the
shaft l8 and is electrically insulated therefrom
by a sleeve 20 of insulating material. The outer
50 end of the spindle l9 forms a yoke or fork 2| be
tween the arms or prongs of which is pivoted an
eccentric emergency governor flyweight 22, the
pivot being indicated at 23. The upper end of the
?yweight 22 is the heavy end and is in the form of
55 a contact arm. 24. The weight 22 below the pivot
outer ring 32. As soon as the speed reaches a cer
on the ?yweight 22 causes outward movement of 35
the contact arm against the force of the spring
3%. The arms of the ?yweight under such con
ditions are moved into a position indicated in
dotted lines in the drawing, in which position the
circuit for the relay i6 is interrupted causing 40
movement of the switch H by the action of the
spring I i. The speed at which interruption of the
circuit takes place depends upon the compression
of the spring 30, which compression may be reg
ulated by axial movement of the normally station
ary rod member 38.
Summarizing, the flyweight of our improved
emergency speed governor normally closes an elec
tric circuit through two ring members concen 50
trically arranged with the spindle for the fly
weight and rotatable therewith. The arrange
ment is simple in construction, reliable in opera
tion and may be manufactured at small cost.
Having described the method of operation of 55
our invention, together with the apparatus which
we now consider to represent the best embodiment
thereof, we desire to have it understood that the
apparatus shown is only illustrative and that the
invention may be carried out by other means.
What we claim as new and desire to secure by
Letters Patent of the United States, is:—
1. An emergency speed governor comprising a
rotatable spindle having an end portion forming
10 a yoke, a ?yweight eccentrically pivoted on the
yoke, a metal ring secured to the yoke and in con
ductive relation therewith, another metal ring
insulated from the ?rst ring and rotatable there
with, said other metal ring being normally in con
15 ductive relation with the flyweight, a stationary
casing, two brushes held on the casing, each brush
engaging one of the rings, means for biasing the
flyweight against the action of centrifugal force
comprising a coil spring coaxially disposed within
20 the inner ring, and means including a member
supported on the stationary casing for adjusting
the spring during operation.
2. An emergency speed governor comprising a
rotatable spindle having an end portion forming
a yoke, a flyweight eccentrically held on the yoke,
a metal ring secured to the yoke and in conductive
relation therewith, another metal ring insulated
from the ?rst ring and rotatable therewith, said
other metal ring being normally in conductive
relation with the ?yweight, a stationary casing,
two brushes held on the casing, each brush engag
ing one of the rings, means for biasing the ?y
weight against the action of centrifugal force
comprising a spring coaxially disposed with the
spindle, and means for adjusting the spring dur
ing operation comprising a cylinder bearing
against one end of the spring, a stationary mem 15
ber coaxial with the spindle and supported on the
casing and a thrust ball intermediate the station
ary member and said cylinder.
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