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Патент USA US2405396

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A118» 5? 1946~
c. E. BAZLEY
'
2,4053%
ELECTROMAGNET
- Filed NOV. 29, 1944
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Inventbr':
Carl E. Bazley,
His Attorney. ‘
2,405,396
Patented Aug. 6, 1946
UNITED STATES PATENT OFFICE
2,405,396
ELECTROMAGNET
Carl E. Bazley, Schenectady, N. Y., assignor to
General Electric Company, a, corporation of
New York
Application November 29, 1944, Serial No. 565,599
5 Claims. (01. 175—--341)
1
2
My invention relates to electromagnets, more
particularly to direct current electromagnets,
and has for its object a simple and reliable means
for preventing movement of the armature to its
, An intermediate auxiliary plunger core member
unattracted position in the event of a severe
'5 is provided which is movable axially of the coil
in an upward direction from the position seen in
0:
the drawing against the downward biasing force
applied by a helical tension spring 8. On its
shock.
lower end, the core member ‘I is provided with a
In a direct current magnet, if the armature is
moved away from the pole face on which it is
seated in its attracted position, a sharp decrease
in the magnetic pull on the armature results.
Such movement of the armature away from its
smaller cylindrical portion 9 which extends down
attracted position with the coil energized may be
caused by a severe shock, with rebound of the
armature away from the stationary pole face in
ward loosely into a bore ii] in the tubular core
member 6. The upper end of the spring 8 is se
cured to the lower end of this portion 9, while
the lower end of the spring is secured to a suit
able Washer or nut II on the outside of the core
member 3. Thus, as shown, the spring may be
secured to the extension 9 by means of a smaller
a manner somewhat similar to the so-called bil
threaded portion on the extension which ?ts into
liard ball effect. The great decrease in magnetic
pull caused by the separation of the armature
from its stationary pole face would, in most cases,
the upper end of the spring, while the nut 01‘
washer H has internal threads into which the
iower end of the spring ?ts.
Thus the spring applies a substantial bias
result in the movement of the armature to its full
unattracted position with operation of the de
vices connected to the armature, although it will
be understood that the armature would there
ing force on the movable core member 1 in a
downward direction so as to hold seated the shoul
der formed between the upper and lower cylin
drical portions on the upper end of the core mem
after be picked up to its attracted position if the
ber 6. When the coil I is energized, the armature
pickup section of the coil were again energized.
In accordance with my invention, I provide 25 5 is pulled down until the lower end of the ar
mature seats on the normally stationary pole face
means for preventing the sharp decrease in mag
netic pull on the armature in the event that it
provided on the upper end of the member 1.
is thrown away from the stationary pole face by
The downward biasing force applied by the spring
8 is greater than the magnetic pull of the coil
a severe shock.
In one form of my invention, I
provide an auxiliary intermediate movable pole 30 applied to the armature 5 up to the point where
the plunger 5 is seated, or nearly seated, in its
piece having a portion in telescoping relation
attracted position so that during the movement
with the stationary magnet core so that this in
termediate portion can move with the armature
against a spring bias in the event of a severe
of the armature 5, together with the mechanism
operated by the armature to its attraced position,
shock while maintaining the magnetic pull on the
armature.
For a more complete understanding of my in
vention, reference should be had to the accom
panying drawing, the single ?gure of which is
the core member 'l' is held by the spring 8 in its
seated position shown in the drawing.
When the lower end of the plunger 5 engages
the stationary pole face on the upper end of the
an elevation View partly in section of an electro
armature increases very greatly because of the
elimination of the air gap between the pole faces
so that this sealed pull between the armature
and the core member 7 becomes greater than the
magnetically operated switch embodying my in
vention.
Referring to the drawing, in one form of my
invention I provide a magnet coil 1 mounted on
core member ‘I, the magnetic pull applied to the
downward biasing force applied by the spring 8.
a suitable spool 2 made of electrically insulating 45 Consequently, in the event of a shock applied to
material and enclosed in a cylindrical member
3 made of magnetic material which forms a part
of a magnetic core for the coil. As shown, at its
upper end the cylindrical member 3 is provided
with a ring-shaped core member 4 provided with
the support it’ on which the magnet is mounted
and transmitted from the support to the magnet
core and armature, the core member -I can move
upward against the biasing force of the spring 8
along with the armature 5 so that the sealed-in
relation between the armature and the member
1 is not broken. Thus a severe shock applied to
plunger armature 5. At its lower end the cylin
the core members 6 and ‘l in an upward direction
drical core member 3 is spun or bent over and
tends to throw the armature 5, assuming it is
provided with a short tubular stationary core
member‘ 8 extending into the coil.
65 in its downward sealed attracted position, up
a central aperture through which extends a
2,405,396
4
3
ward away from the core member 1.
Instead of
member, a magnetic connection between said in
this happening, however, the core member 7
moves with the armature, the spring 8 elongat
ing. The cylindrical extension on the lower end
of the core member I maintains substantially the
same ?ux path for the coil when the member 'l
is moved upward without substantial change in
the magnetic flux in the member ‘i so that the
termediate core member and said magnetic core
the upper end of the tubular core member 6 is
not great and is only a fraction of the pull between
event of a shock applied to said magnet core
while the coil is energized.
the members 5 and l for the reason, as previously
observed, that movement of the core member 7
upward away from the member ii does not sub
net core for said coil, an intermediate core mem
stantially reduce the magnetic ?ux through these
with said magnet core when moved in one direc
tion, an armature for said coil movable in said
providing for movement of said intermediate
core member without substantial decrease in the
magnetic flux in said intermediate core member,
and a Spring holding said intermediate core
member in abutting engagement with said mag
net core with a force substantially greater than
the magnetic force e?ecting movement of said
sealed pull between the members 5 and 'l is not
appreciably reduced.
10 armature into engagement with said intermedi
ate core member whereby said spring yields to
It will be understood that the sealed-in pull be
provide for movement of said armature in the
tween the flange on the core member I seated on
2. An electromagnet comprising a coil, a mag
ber movably mounted for abutting engagement
two members.
The spring 3, however, applies a downward 20 direction by energization of said coil to an at
tracted position in engagement with said inter
biasing force to the core member ‘i which does
mediate core member, and a spring normally
not decrease when the core member I is moved
holding said intermediate core member in abut
upward and in fact will increase somewhat.
ting engagement with said magnet core with a
Thus, in the event of a shock which throws the
force substantially greater than the magnetic
armature upward, the spring applies a force to
force eiiecting movement of said armature, said
return the armature to its attracted position
intermediate core member and said magnet core
which is much greater than the normal mag
being constructed and arranged with walls rela-.
netic pull on the armature.
tively slidable in the direction of movement of
A guide tube it made of a' nonmagnetic mate
said armature so that said intermediate core
rial, such as brass, is provided in the bore of the
member is movable away from said magnet core
coil so as to serve as a guide for the armature
against the force of said spring in response to a
5 and the core member ‘i, and also as an air gap
shock while the coil is energized without substan
between the armature and core member 43.
tial decrease in the magnetic force holding said
A guide pin if; made of a nonmagnetic mate
armature and said intermediate core member to
rial, such as phosphor bronze, has its upper end
gether whereby said intermediate core member
secured to the lower, end of the armature 5 and
and said armature are thereafter returned by
its lower end extending loosely in a central bore
in the core member I.
This rod ill serves as a
guide for the lower end of the armature.
Although any suitable switch or mechanism
can be connected to the armature 5 for opera
tion thereby, I have shown the armature con
nected to an electric switch of the type described
and claimed in my copending application Serial
No. 551,484, filed August 28, 1944. This switch
comprises a slider plate i5 made of electrically
insulating material which is slidably mounted on
a support it and provided with a plurality of
apertures ii for controlling the engagement and
said spring to their attracted positions.
An electromagnet comprising a coil, a mag
net core for said coil having a core portion at
one end of said coil, an intermediate core mem
ber in said coil movably mounted in a position
in abutting engagement with said core portion,
a plunger armature extending into the other end
of said coil movable by energization of said coil
to an attracted position in engagement with said
intermediate core member, and a spring normal
ly holding said intermediate core member in said
position in abutting engagement with said core
separation of pairs or” spring contacts l8, Thus, 50 portion with a force substantially greater than
the magnetic force eifecting movement of said
when the slider is in its uppermost position to
armature, said intermediate core member and
which it is biased by the springs i9 and 20, a pro
said core portion being constructed and arranged
jection 2i separates the pair of contacts it while
with axially extending relatively slidable walls
another pair of contacts lilo; are moved together
by the side walls of a narrow portion of the 55 so that said intermediate core member is mov
able axially against the force of said spring in
slot.
response to a shock while the coil is energized
While I have shown a particular embodiment
without substantial decrease in the magnetic
of my invention, it will be understood of course
force holding said armature and said intermedi
that I do not wish to be limited thereto since
ate core member together whereby said interme
many modifications may be made and I there
diate core member and said armature are there
fore contemplate by the appended claims to cover
after returned by said spring to their attracted
any such modi?cations as fall within the true
positions.
spirit and scope of my invention.
ll. An electromagnet comprising a coil, a mag
What I claim as new and desire to secure by
net core for said coil having a portion extending
Letters Patent of the United States is:
65
into one end of said coil, an intermediate mov
1. An electromagnet comprising a coil, a mag
able core member in said coil, a spring normally
net core for said coil, an armature for said mag
holding said intermediate core member in abut
net core, an intermediate core member mounted
ting engagement on one side with said core por
in abutting engagement with said magnet core
tion, and a plunger armature extending into the
between said armature and said magnet core for
other end of said coil movable into engagement
movement away from said magnet core in the di
with the opposite side of said intermediate core
rection of movement of said armature to its un
member when said coil is energized, an axially
attracted position, said armature being movable
extending projection on said intermediate core
by energization of said coil to an attracted posi
tion in engagement with said intermediate core 75 member, said core portion being shaped with a
2,405,896
wall in slidable engagement with said extension
provided with a bore concentric with said coil
axially of said coil so that said intermediate core
and with an annular pole face on the same side
of said portion as said armature, an intermediate
movable core member in said coil having on one
end a ?ange seated on said annular pole face and
member is movable axially without substantial
change in the reluctance of the magnetic circuit
through said portion and said intermediate core
member, said spring applying a force to said in
termediate core member which is substantially
a cylindrical portion ?tting slidably into said
bore, and a spring for biasing said intermediate
core member against said annular pole face with
greater than the magnetic force applied to effect
a force substantially greater than the magnetic
movement of said armature whereby said inter
mediate core member normally is held in en 10 force applied to said armature in moving it to its
attracted position but smaller than the sealed-in
gagement with said core portion by said spring
pull between said armature and the other end of
when said armature is moved by said coil, said
said intermediate core member when said arma
spring yielding to provide for movement of said
ture is seated in its attracted position on said in
gether in the event of a shock when said coil is 15 termediate core member whereby in the event of
of shock said spring yields to provide for move
energized.
ment of said auxiliary core member with said
5. An electromagnet comprising a coil, a
armature.
plunger armature extending into one end of said
CARL E. BAZLEY.
coil, a magnet frame for said coil having a por
tion extending into the other end of said coil 20
armature and said intermediate core member to
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