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Sept. 10, 1946.
'
- / J. E. CHAPMAN-
2,407,537
' POWER OBERA'I‘ED ACTUATOR
Filed may 13. 1944
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INVENTOR.
JAMES E. CHAPMAN
BY
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ATTORNEY
Sept 10, 1945'
,J. E. CHAPMAN
'
2,407,537v
POWER OPERATED ACTUATOR
Filed May 13, 1944
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INVENTOR. '
‘
‘JAMES
E.
I.
CHAPMAN '
2,407,531
Patented Sept. 10, 1946
UNITED STATES PATENT OFFICE‘
2,407,537
rowan OPERATED ACTUATOR
James E. Chapman, Phoenix, Ariz., assignor to
The Garrett Corporation, Los Angeles, Calitl, a
corporation of California
Application May 13, 1944,. Serial No. 535,533
9 Claims. (01, 192-142)
1
My invention relates to a power operated
unitary device which may be connected between
a support and a member which is to be moved
back and forth between selected positions of
operation and which may be operated to perform
the function of moving the part positively and
consistently into the positions which have been
predetermined therefor. Although the invention
is of general utility for the moving oimechan
ical parts, it is especially adapted for movement
of parts on an aircraft which must be brought
accurately into a selected position of operation.
For example, the device has extensive use as a
means for moving ?aps which serve as shutters
or valves for an air passage and as a means for 15
moving butter?y valve members within ducts or
air passages, and for the purpose of simplifying
this disclosure, the invention will be explained
with relation to this use thereof.
transmission means a part which yields after the
moved part has been brought into position
against a stop, and a shut off means which acts
in response to this yielding to discontinue the
operation of the power means after the moved
part has reached its required position.
It is an object of the invention to provide a
power driven actuator having means acting in
response to the overload which is produced when
the moved part reaches its required position
against a stop to discontinue the operation of the
motor after the moved part has been brought
into engagement withthe stop, thereby assuring
that the moved part will be always brought into
exactly the position required therefor.
It is an object of the invention to provide an
actuator having power means which acts between
a yieldable support and a point of application for
the power, the reaction against this yieldable
It is an object of the invention to provide an 20 support causing its movement in rearward di
rection when the moved part has been brought
actuator unit having a power means such as an
into position against the stop, there being a con
electric motor and a transmission mechanism
trol which acts in response to this reverse or re
whereby this power means accomplishes move
actionary movement of the support to then ef
ment of a part accurately into a selected posi
fectuate
discontinuation of the operation of the
tion of operation which is determined by a stop.
power means. It is also an object of the inven
Power driven actuators of this type have been
tion to provide an actuator having a screw mem-v
made having limit switches for the motor so that
ber adapted to be attached to a part to be moved
the movable part of the actuator is stopped in a
and having a second screw member in threaded
de?nite position. This means that the actuator
must be very carefully adjusted with relation to 30 engagement with the ?rst screw member, rota
tion of the second screw member causing axial
the parts to be moved so that the movable part
movement of the screw member and the part to
of the actuator will stop in a position to bring
which it is connected, the device also having
the valve or other member to which it is con
yieldable means for holding the second screw
nected to its required position, and where an
actuator of this type has been carefully adjusted,
trouble has resulted from the coasting of the
motor after the opening of the associated limit
member against axial movement during the nor
mal operation of the actuator, and a control
means which acts in response to reverse or re
actionary movement of the second screw mem—
her to stop the motor in response to this reac
beyond its required position or place the structure
44) tionary movement of this second screw member
under heavy strain or even injure the same.
when the ?rst screw member is held against fur
It is an object of the invention to provide a
ther movement as the result of the moved part’s
motor driven actuator of this character wherein
reaching its required position determined by a
the power means is operated after the moved
suitably placed stop.
part has been brought into its desired position
An object of the invention is to provide a
and wherein the actuator has means which yields
device embracing any one of the characteristics
after the part has been brought into a desired
set forth in the foregoing wherein a part may
switch so as to either carry the moved member
position against the stop, this characteristic of
be moved forwardly and rearwardly between two
yieldability permitting the power means to oper
positions predetermined by stops, wherein the
ate for a short period of time thereafter, with
power means is actuated after the moved part
out placing of undue strain upon any of the 50 has reached either of the stops, there being in
parts, and assuring that the part which has been
corporated therein a yieldable element which
moved will consistently be brought into its re
yields during the operation of the power means
quired position.
after the moved part has engaged either of the
It is an object of the invention to provide an
stops, in association with a control for the power
actuator of this character having in its power
3
2,407,537
means which operates after yielding of the yield
able means has occurred.
Further objects and advantages of the inven~
tion will be brought out in the following part
of the speci?cation.
Referring to the drawings which are for illus~
trative purposes only,
4
in a reactionary movement of the collar 9 and
the screw member I3 which is permitted by yield»
ing of one or the other of the yieldable means
20 or 2i. When the screw member 5 is moving
axially outward, the reaction of the force which
the member 5 exerts against the lever A will be
taken by the yieldable means 20, and when the
Fig. l is a schematic view showing my inven~
screw member 5 is moving inward, a reaction of
tion employed for the opening ‘and closing of a
the collar I9 against the yieldable means 2| will
butter?y valve in a duct.
l0 be produced.
Fig. 2 is an enlarged sectional view of the
The collar I9 has a gear 23 formed thereon and
actuator.
adjacent this gear there is an annular channel
Fig. 3 is a section taken substantially as in
24. The motor It! drives a worm 25 which engages
dicated by the line 3—3 of Fig. 2.
the gear 23 and thereby rotates the collar is and
Fig. 4 is a diagram of the wiring.
15 the screw member I3. A fulcrurned lever 25, hav
In Fig. 1 of the drawings I show a duct I rep
ing a ball on either end, is supported on a pivot
resentative of an air duct in an aircraft. To close
21 in such position that the ball 23 on its inner
the duct I, there is a butter?y valve 2 which
end will lie in the channel 24 of the collar 29.
swings on a shaft 3. A lever 4 is connected to
the valve 2, to provide a means of attachment 20 Accordingly, axial movement~reactionary move
ment~of the collar I9 from the centralized posi
for the front member 5 of an actuator 6, one
tion in which it is shown in Fig. 2 will cause the
end of which is connected by means of a bolt
lever 26 to swing in a direction determined by the
‘I to a stationary support 8 forming a part of the
direction of the reactionary movement of the
aircraft structure. The actuator 6 includes a
hollow body or housing 9 containing suitable 25 collar Hi. The outer end of the lever 26 projects
into a switch box and the ball 29 on its outer
transmission mechanism which receives power
end lies between cut off switches 39 and 3! which
from a motor It] and produces axial movement
are swingably mounted on pivots 32 so that these
of the front member 5 which normally comprises
out off switches 32 and 3E may be swung toward
a screw as will be hereinafter described.
The valve 2 is shown in closed position in the 30 or away from the ball 29 for purpose of adjust»
ment of the position of the ball 29 required to
duct I, this closed position being determined by
actuate the respective switches 39 and SI. The
the valve 2 coming into engagement with a stop
switches 35 and 3| are small snap switches, this
which consists of the portion II of the duct
type of switch being preferable in view of the
wall. To open the valve 2, the actuator 6 pulls
opening and closing movement of
upward on the lever 4 to swing the valve 2 in ' instantaneous
the contacts. The lever 26 and the switches 38
counterclockwise direction into open position in—
and 3| form part of a control means for the power
dicated by dotted lines 2’, at which time the lever
means represented by the motor lfl. This adjust~
18 engages a stop l2.
ment of the switches 30 and 3! is accomplished
Referring to Fig. 2, it will be perceived that
the actuator 6 includes a second screw member
I3 having external threads to engage the internal
threads of the thrust bar or screw member 5.
Rotation of the screw member I3 will produce
axial movement of the screw member 5 in view
of the fact that this member 5 is held from axial
rotation by its pivotal engagement with the lever
4. The screw member 5 is guided by a sleeve I 4
which projects from the shell 9 of the actuator.
The inner end of the screw member I3 is sup
ported by spaced bearings I5 and I6, each of
which consists of an outer race I‘! and an inner
race IS. The screw member I3 is axially slidable
in the inner races I3. The collar or wheel I9 is
?xed on the inner portion of the screw member
I3 between the bearings I5 and I6 in spaced
relation thereto, and yieldable means 20 and 2|
are disposed between ‘the inner races I8 and the
bearings I5 and I6 and the opposing end faces o-r
shoulders of the collar I9. these yieldable means
by adjusting screws 33 and springs
placed
in the manner shown. Eachscrew 33 passes
through an opening in the switch box 35 and has
threaded engagement with a nut 36 located at the
end of the structure of the switch
or ii oppo
site its associated pivot 32, and each spring 34 is
placed around the screw 33 between the nut 36
and the wall of the casing so as to resiliently force
the associated switch inward to the limit per“
mitted by the adjustment; of the screw. A feature
of this construction is that the switches 32 and 3i
are yieldably mounted so that they may be swung
outwardly should there be an overtravel of the
ball 253 at any time; thereby avoiding injury to
a switch as a result of such overtravel.
Fig.
The
4 asmotor
being Inof is
reversible
diagrammatically
type havingshown
forward
and reverse windings 31 and 38 disposed in series
with the contacts 39 of the switches 33 and 3!,
A main control switch 46 is provided having a
swinging
contact Ill which is connected to a source
20 and 2| resisting axial movement of the screw 60
of electrical energy represented by a battery 4E;
member I3 in either direction.
when it is desired to operate the actuator so as to
The yieldable means 20 and 21 each comprise
move the thrust member 5 outward, the switch
a group of dished washers 22 disposed in side by
side relation as shown so that when axial pres
sure is applied thereto, the respective washers
22 will flatten. The washers are of such strength
that they will not yield materially under the
load applied to the screw member It‘ during
movement of the valve 2 from one position to
another, but are of such strength that when axial
movement of the screw member 5 is stopped as
the result of engagement of the valve 2 with the
stop II or engagement of the lever A with the
member M is moved downward so as to energize
the motor I a? through its forward winding 3?.
When the axial movement of the member 5 is
stopped, as a result of the engagement of the valve
2 with the stop I I, the continued operation of
the motor I i] will result in a reactionary move
result
lever
ment 255
of
that
the
in the
counterclockwise
collar
ball. ISasinwill
a direction
engage
direction,
the
to button
swing
with 553
of the snap switch 38 and will actuate this snap
switch 3t! by opening its contact 39, thereby cut
between the screw members 5 and I3 will result 75 ting off the ?ow of current throug-r the forward,
Winding 3?. Upward movement of the switch
stop I2, the action of the threaded engagement
2,407,537
5
member 4| will energize the motor it! through the
contacts 39 of the switch 3| and the reverse wind
ing 38, thereby producing a rotation of the motor
which will drive the screw member 13 in a direc~
tion to move the member 5 upward so as to carry
same reaches a selected position, and means for
adjusting said switch into different positions
along said path of movement.
3. In an actuator for moving a part into a
prescribed position: a ?rst screw member having
connection to said part; a second screw member
engaging said ?rst screw member so that rela
tive rotation of said screw members will produce
operative movement of said ?rst screw member,‘
in downward direction so as to swing the lever 26 10’ said second screw member having a rearwardly
faced shoulder; bearing means supporting said
counterclockwise to actuate the switch 3| by open
second screw member so that it may have rotary
ing its contacts 39, thereby cutting off the ?ow of
and axial movement; power means for rotating
current through the motor It. It will be noted
said second screw member; yieldable thrust
that in the normal operation of the device, the
means engaging said shoulder and resisting rear
motor is not stopped until after the member 2 has
ward movement of said second screw member
been moved fully into the position selected there—
the valve 2 into open position and to bring the
lever 4 into engagement with the stop it at which
time the continued operation of the motor will
produce a reactionary movement of the collar H9
for, such position being determined by the utilized
under normal load applied thereto, said thrust
means permitting rearward axial movement of
stop I l or 12. Since the motor is not shut off until
said second screw member when an overload is
after the member 2 reaches its desired position
and an overload is produced, any production of an 20 applied thereto as the result of said p-art’s reach
ing its prescribed position; a control member
overload through stopping of the member E—for
which is moved through a path of movement in
example, as the result of some inadvertent ob
response to said rearward axial movement of
struction—wi1l stop the motor and thereby pre
said second screw member; control means for
vent injury to it which would be caused by con
said power means having a control circuit with
tinued operation under overload.
a control switch therein for stopping the action
I claim as my invention:
of said power means; and means for yieldably
1. In an actuator for moving a part into a
supporting said switch in the path of movement
prescribed position: a ?rst screw member having
of said control member so that it will bodily yield
connection to said part; a second screw mem
without injury thereto should said power means
ber engaging said ?rst screw member so that
continue to operate for a short period of time
relative rotation of said screw members will
after said switch is actuated.
produce operative movement of said ?rst screw
4. In an actuator for moving a part into a
member, said second screw member having a
prescribed position: a ?rst screw member hav
rearwardly faced shoulder; bearing means sup
ing connection to said part; a second screw mem
porting said second screw member so that it
ber engaging said ?rst screw member so that
may have rotary and axial movement; power
relative rotation of said screw members will pro
means for rotating said second screw member;
duce operative movement of said ?rst screw "
yieldable thrust means engaging said shoulder
‘member; power means for rotating said second
and resisting rearward movement of said sec
ond screw member under normal load applied 40 screw member; spaced bearings supporting the
rearward end of said second screw member for
thereto, said thrust means permitting rearward
rotary and axial movement; a collar ?xed on
axial movement of said second screw member
said rearward end of said second screw member
when an overload is applied thereto as the re
sult'of said part’s reaching its prescribed posi
tion; and means actuated by said rearward axial
movement of said second screw member to stop
the operation of said power means.
between said bearings and in spaced relation
thereto; thrust springs in the spaces between
said collar and said bearings to resist axial move- '
ment of said second screw member under normal
axial load applied to said second screw member
2. In an actuator for moving a part into a
and yielding under axial overloads applied to said
prescribed position: a ?rst screw member hav
ing connection to said part; a second screw mem 50 second screw member to permit axial movement
of said second screw member and said collar;
ber engaging said ?rst screw member so that
a control member moved by said axial move
relative rotation of said screw members will pro
ment of said collar; and electrical control means
duce operative movement of said ?rst screw mem
for said power means including a pair of shut off
ber, said second screw member having a rear
switches disposed on opposite sides of said con
wardly faced shoulder; bearing means support
trol member so that one of said switches will be
ing said second screw member so that it may
actuated by movement of said control member
have rotary and axial movement; power means
in one direction and the other of said switches
for rotating said second screw member; yieldable
will be actuated by movement of said control
thrust means engaging said shoulder and resist
ing rearward movement of said second screw 60 member in the opposite direction, to stop the
operation of said power means.
member under normal load applied thereto, said
5. In an actuator for moving a part into a pre
thrust means permitting rearward axial move
scribed position: a ?rst screw member having
ment of said second screw member when an
connection to said part; a second screw member
overload is applied thereto as the result of said
part’s reaching its prescribed position; a con
engaging said ?rst screw member so that relative
trol member which is moved through a path of
rotation of said screw members will produce op
erative movement of said ?rst screw member;
movement in response to said rearward axial
power means for rotating said second screw mem
movement of said second screw member; and
control means for said power means having a
ber; spaced bearings supporting the rearward end
control circuit with a control switch therein for 70 of said second screw member for rotary and axial
stopping the action of said power means, said
movement; a collar ?xed on said rearward end
switch being adjustable along said path of move
of said second screw member between said bear
ment of said control member so that said switch
ings and in spaced relation thereto; thrust springs
may be adjusted into a position wherein it will
in the spaces between said collar and said bear
be actuated by said control member when the
ings to resist axial movement of said second screw
2,407,537
7
member under normal axial load applied to said’
second screw member and yielding under axial
overloads applied to said second screw member
to permit axial movement of said second screw
member and said collar; a control member moved
by said axial movement of said collar; and elec—
trical control means for said power means includ
ing a pair of snap shut oil switches disposed on
opposite sides of said control member so that one
8
circuit with a control switch therein for opera
tion by said control member to stop the action of
said power means, a support on said shell along
the path of movement of said control member,
pivot means swingably supporting said switch on
said support so that it may swing in said path
of movement toward and away from said control
member, a resilient member on said support urg
ing said switch toward said control member, and
of said switches will be actuated by movement of 10 an adjustable stop for limiting the distance said
said control member in one direction and the
switch may swing toward said control member
other of said switches will be actuated by move
on said pivot means, said resilient member ena
ment of said control member in the opposite di
bling said switch to be moved bodily by said con
rection, to stop the operation of said power means,
trol member by operation of said power means
said snap switches being supported so as to bodily
after the operation of said switch by said control
yield when the operation of said power means is
member.
continued after the actuation of said switches.
8. In an actuator for moving a part into a pre
In. an actuator for moving a part into a pre
scribed position, the combination of: a ?rst screw
scribed position, the combination of : a ?rst screw
member having means for connecting it to said
member having means for connecting it to said 20V part; a sheil having spaced walls supporting
part; a shell having spaced walls supporting
spaced bearings; a second screw member disposed
spaced bearings; a second screw member disposed
in projecting relation to said shell and being sup
in projecting relation to said shell and being sup
ported for rotary and axial movement in said
ported for rotary and axial movement in said
spaced bearings, said second screw member being
spaced bearings, said s cond screw member being
in threaded engagement with said ?rst screw
in threaded engagement with said ?rst screw
member; a collar on said second screw member
member; a collar on said second screw member be
between said bearings; a gear on said collar; a
tween
bearings; a spring between said collar
and one of said bearings for resisting axial move
ment of said second screw member and enabling
a reactionary axial movement of said second
screw member when said. part reaches said pre
cribed position thereof; power means engag
ing said second screw member to rotate the same;
a control member which is moved through a path
of movement in response to said reactionary
movementof said second screw member; and con~
spring between said collar and one of said bear
ings for resisting axial movement of said ‘second
trol means for said power means having a con~
trol circuit with a control switch therein for op
screw member and enabling a reactionary axial
movement of said second screw member when
said part reaches said prescribed position there
of ; power means carried by said shell and having
a gear element engaging said gear, for rotating
said second screw member; a control member
which is moved through a path of movement in
response to said reactionary movement of said
second screw member; and control means for
said power means having a control circuit with
eration by said control member to stop the action 40 a control switch therein for operation by said
of said power means, a support on said shell along
control member to stop the action of said power
the path of movement of said control member,
means, a, support on said shell along the path of
means for movably attaching said switch to said
movement of said control member, means for
support so that it will lie in the path of movement
inovably attaching said switch to said support
of said control member, a resilient member on
so that it will lie in the path of movement of
said support urging said switch toward said con
said control member, a resilient member on said
trol member, and a stop for limiting the move
support urging said switch toward said control
ment of said switch toward said control member,
member, and a stop for limiting the movement of
said resilient member enabling said switch to be
said switch toward said control member, said
moved bodily by said control member by opera
resilient member enabling said switch to be
tion of said power means after the operation of
moved bodily by said control member by oper
said switch by said control member.
ation of said power means after the operation
'7. In an actuator for moving a part into a pre»
of said switch by said control member.
scribed position, the combination of : a ?rst screw
member having means for connecting it to said
part; a shell having spaced walls supporting
spaced bearings; a second screw member disposed
in projecting relation to said shell and being sup
9. In an actuator for moving a part into a pre
determined position: a ?rst screw member con
nected to said part; a second screw member en
gaging the ?rst screw member so that relative
rotation of said members will produce operative
movement of said ?rst member; means support
ported for rotary and axial movement in said
spaced bearings, said second screw member being 60 ing said second screw member so that it may
in threaded engagement with said first screw
have rotary and axial movement; power means
member; a collar on said second screw member
for rotating said second screw member; yield
between said bearings; a spring between said col
lar and one of said bearings for resisting axial
movement of said second screw member and en
abling a reactionary axial movement of said sec
ond screw member when said part reaches said
prescribed position thereof; power means engag
ing said second screw member to rotate the same;
a control member which is moved through a path
of movement in response to said reactionary
movement of said second screw member; and con
trol means for said power means having a control
able thrust means; an operable connection be
tween the thrust means and second screw mem
ber whereby said thrust means will resist axial
movement of the second screw member under
normal loads and will permit axial movement of
said second screw member when an overload is
applied thereto; and means actuated by said
axial movement of the second screw member to
stop the operation of said power means.
JAMES E. CHAPMAN.
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