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Патент USA US3052834

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United States Patent O?lice
2
1
3,052,828
ROTARY ELECTROMAGNETIC ACTUATOR
Robert B. Phinizy, Los Angeles, Calif., assignor to P.S.P.
Engineering Co.
Filed Aug. 5, 1959, Ser. No. 831,874
2 Claims. (Cl. 317-199)
This invention relates to rotary electromagnetically
operated actuators.
3,052,828
Patented Sept. 4, 1962
magnetic material to complete the magnetic circuit
through the windings and the core, it being made of suit
able magnetic material.
The rotative output shaft of the device is designated at
30 and is in a position normal to the plunger or armature
stem 25 with the axes of the two shafts crossing as shown.
The output shaft 30 is transversely disposed in a hous
ing 31 made of insulating or non-magnetic material hav
ing a peripheral ?ange or shoulder 32 on one side whereby
There are many applications wherein it is desired to 10 it is attached to the housing 13 by the bent-over flange
33 as shown.
have a rotative output from an electromagnetically actu
The shaft 30 is mounted in needle bearings as designated
ated device. Such devices have been known in the prior
at 34 in FIGURE 2 which are disposed in bores as shown
art wherein an electromagnet having an armature or
at 35 in the housing 31 as shown in FIGURE 2. The
plunger with a relatively short stroke, has been arranged to
provide a rotative shaft output. However, the prior art de 15 needle bearings may be of conventional construction com
prising elongated needle members 36 pointed at the ends
vices have generally included additional parts or What
and held within a bearing retainer 37 ?tting in the bore
might be said to be complications utilized for the purpose
35 and engaging a retainer ring 40 ?tting in an annular
of providing for only rotative and not axial movement in
groove in the shaft 30. A needle bearing similar to that
the shaft output; to provide for axial movement only and
not rotative movement of the armature or plunger, and 20 just described is provided at the other end of shaft 30
not shown in FIGURE 2.
to provide for effective conversion and transmission of
The end of the plunger or armature stem 25 is formed
motion from the armature to the rotative output.
as a yoke as shown at 42 in FIGURE 2 and pivoted be
It is the object of this invention to provide an electro
tween the legs of the yoke on a pivot pin 43 is a cam
magnetic device having a rotative output of simpli?ed,
durable, and effective construction and employing a 25 roller 44. The cam roller 44 engages with a cam mem
ber or actuator member 45 rigidly mounted on the shaft
minimum number of highly reliable parts.
30. The cam member 45 has the shape shown in FIG
It is another object of the invention to provide a device
URE l. The camming or actuating surface is designated
as in the foregoing object wherein the motion converting
at 46, the rotative output being through a limited number
and transmitting mechanism is reduced to two parts hav
of degrees. It will be noted that the camming surface
ing mutual engagement, one carried by the armature or
46 includes a portion of greater radial distance from the
plunger and the other by the rotative output shaft.
center of shaft 35} extending to‘ a portion of less radial
A further object of the invention is to provide a device
as in the foregoing objects wherein the motion converting
distance, the camming surface terminating in outwardly
device as in the foregoing objects wherein the output shaft
is in a position normal to the plunger of the electromagnet
cam 45 in a clockwise direction until the roller 44 moves
curving portions of the cam. In operation, upon energi
and transmitting means comprises a cam carried by the
output shaft and a cam follower member carried by the 35 zation of the electromagnet, the armature 27 moves up
wardly as shown in FIGURE 1, thus moving the plunger
armature or plunger cooperating therewith and which
25 linearly to close the air gap between the armature 27
actuates the cam for rotating the output shaft in response
and core 21. This movement imposes a thrust by roller
to linear movement of the armature of plunger.
44 against the cam surface 46 which tends to rotate the
A still further object of the invention is to provide a
or the stem of the armature of the electromagnet.
against the outwardly extending portion of the cam sur
face as designated at 48.
The action is a rotary move
ment resulting from the thrust of the plunger. As can
Further objects and additional advantages of the inven
be seen, the mechanical advantage of the cooperating
tion Will become apparent from the following detailed
45 parts in producing torque or rotative effort is greater at
description and annexed drawings, wherein:
the beginning of the plunger stroke when the pull on the
FIGURE 1 is a cross-sectional elevation of a preferred
armature is weaker. The mechanical advantage reduces
form of the invention; and
during the stroke by reason of the shape of the camming
FIGURE 2 is a side elevation of the invention partly in
surface 46 as may be seen so that the mechanical ad
section.
Referring now more particularly to the drawings, num 50 vantage is less when the thrust, that is, the magnetic pull,
is greater as the air gap closes.
eral 10 designates generally an electromagnet or solenoid
Referring to FIGURE 2, numeral 50 designates a
assembly comprising a winding 11 of preferably cylin
spiral torsion spring having one end, that is the inner
drical conformation. The winding 11 is within a cylin
end, attached to the shaft 30 and the other end attached
drical casing or housing .13 of magnetic material. At the
one end of the winding 11, is a disc 15 of magnetic mate 55 to the housing 31. When the shaft 30 is rotated in the
manner described, tension or stress is placed in the spring
rial and having a bore 16 of substantially the same diam~
50 and upon release of the electromagnet, the position of
eter as the central bore or opening through the solenoid
the shaft 30 is restored to normal by the spring 50 and
winding 11.
the plunger and armature 27 are returned to the position
Numeral 17 designates an end cap or closure which
may be formed of insulating or non-magnetic material 60 shown in FIG. 1. In the restoring motion, the cam 45
transmits motion through the cam follower 44‘ to the
which closes the end of the casing 13, ?tting in an annular
plunger. As can be seen, the motion is transmitted either
shoulder in the end of the casing as shown and against
from the plunger to the shaft or vice versa without lost
the plate 15.
motion and very effectively utilizing only the two mutual
Numeral 21 designates the core of the electromagnet
ly engaging parts, which are of extremely durable inex
65
or solenoid, the core closing the end of the housing 13 and
pensive, and long lasting construction, not in any Way
having a cylindrical portion 22 which ?ts into the bore
liable to possible malfunction or need of maintenance.
within the solenoid winding 11. The core 21 has a cen
In other words, the device embodies the ultimate in sim~
tral bore 23 within which is a sleeve 24 and slidable in
pllcrty, ruggedness, and minimum number of reliable,
the sleeve is the plunger or armature stem 25. The end 70 and dependable parts.
26 of the plunger or stem is of smaller diameter and is
attached to the armature member itself 27 which is of
The foregoing disclosure is representative of a pre
ferred form of the invention and is to be interpreted in
3,052,828
3
an illustrative rather than a limiting sense.
4
The form
hold the cam in ?rm contact with the roller means of
of the invention disclosed is illustrative of equivalent
assemblies and assemblies constituted of equivalent parts,
such as may occur to and be adopted by those skilled in
the art. Accordingly, it is intended that the invention
shall be accorded the full scope of the claims appended
hereto.
What is claimed is:
1. In an electromagnetic device having a rotary out
put in combination, a solenoid winding, a solenoid 10
plunger cooperating with the winding, and arranged for
axial movement, an output shaft having a position nor
mal to the axis of the solenoid plunger, means compris
ing a cam on the output shaft and a cam follower carried
by the solenoid plunger for transmitting motion direct
ly 1‘between the plunger and the shaft whereby linear
15
movement of the plunger rotates the shaft, said cam
follower comprising roller means carried by the solenoid
plunger, the said cam lying in a plane parallel to the
plane of the said roller means and normal to the aXis of 20
the roller means, means comprising a spring having por
tions encircling the said shaft and positioned to resist
rotation of the shaft whereby the spring is operative to
the cam follower and to return the shaft to an initial
position when the solenoid plunger is released, and the
said cam having a cam surface rising at a rate propor
tional to the closing of the magnetic air gap of the elec
tromagnet, i.e. the position of the armature relative to
the electromagnet whereby compensation is provided for
the variable magnetic pull of the electromagnet in the
torque which is transmitted to the shaft.
‘2. The structure as in claim 1, wherein the said plunger
comprises a yoke having the roller means of the cam
follower journalled on a pin extending between the legs
of the yoke.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,124,604
2,497,466
2,528,386
2,779,881
2,963,915
Bidwell ____________ __ July
Olson ______________ __ Feb.
Napper ____________ _._ Oct.
Lundquist __________ __ Jan.
Straulb ____________ __ Dec.
26,
14,
31,
29,
13,
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