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Патент USA US2412304

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Des. 1Q, ‘EM-1%.
ZAIZEM
M. STALEY
ELECTROMAGNET
Filed Aug.
mi
,
1944
M
O
t0
E E9 5
INVENTOR
MARCELLUS STALEY
BY
1%,. 4 in»,
ATTORNEY
Patented Dec. 10, 1946
2,412,304
UNITED STATES PATENT,OFFICE
2,412,304
ELECTROMAGNET
Marcellus Staley, Patchoguc, N. Y.
Application August 11, 1944, Serial No. 549,042
6 Claims. (Cl. 175-336)
1
2
The invention relates to electromagnets or re
Fig. 1 is a sectional view, parts being in ele
vation, the armature of the magnet being in its
lays, particularly adaptable for operating circuit
controlling devices, and the invention comprises
attracted position and a circuit being closed.
‘Fig. 2 is a front elevation with parts broken
away, and
various new and useful improvements in the mag
netic structure and the core therefor, as well as
in the mounting arrangement of both the sta
tionary and movable parts of the operating elec
Fig. 3 is a side elevation similar to Fig. l, the
armature being away from its coil.
Referring to the drawing the stationary mag
net section preferably comprises an angle 5, to
tromagnet or relay.
Among the principal objects of the invention
are to increase the power, efficiency and quietness .10 the vertical leg of which a core 6 is suitably se
of the operating electromagnet, especially for al
ternating current service, and to improve the
construction of the operating electromagnet so
cured at ‘I.
'
The movable section or armature 8 is hinged
.to alip 9 which may be suitably formed on the
horizontal leg of the stationary magnetic section
as to render both manufacture and maintenance
of the same relatively simple and inexpensive, 15 or as illustrated may be a separate angle l0 se
particularly when a number of magnets of simi
cured to said magnetic section.
lar duty are to be assembled.
.
The angle section 5 and the lip 9 may be of
The electromagnet of the present invention is
any desired length so as to carry any suitable
of the clapper type and one of its features is the
number of cores and armatures. The section 5
improved method of mounting the armature V20 also lends itself to supporting any suitable num
ber of ?xed contacts which are engaged by mov
able contacts carried by the armatures as will be
hereinafter described. Thus a unit arrangement
is provided which is very advantageous as it
.25 results in considerable saving of space, material
thereof. The use of bolts and pins is eliminated '
and the complete armature may be instantly re
moved at any time to permit of easy inspection or
repairs.
.
'
A further object is to provide an improved con
tact means which will greatly add to the eiii
ciency and life thereof.
and labor, and permits of easy maintenance,
which is essential, particularly in complicated
.
A still further object is to provide a simple
control systems such as full automatic push but—
‘means for gradually absorbing the momentum
ton elevator control systems which have to be
of the armature in its releasing movements, .30 periodically inspected to assure continuous and
thereby preventing a rebound of the released
safe operation. The electromagnet of the present
armature, saving wear and tear on the parts, and
invention is particularly applicable in a system
eliminating noise when the magnet is beingde
such as illustrated in Patent No. 2,014,821, grant
energized.
ed September 17, 1935.v The stationary magnet
Another object of the invention is the provision ;3.5 section in addition to its magnetic function might
of means to greatly reduce or practically elimi- " ' be a structural member of a complete controller
nate residual magnetism. The electromagnet of
assembly such as is disclosed in the aforesaid
mentioned patent.
the present invention is particularly adapted for
use in controlling the various circuits in an auto
matic electric elevator system and the accurate
timing of the making and breaking of these cir
cuits is vital in connection with the successful and
In accordance with the invention a ?anged disc
40
'
H is attached to the tip of the core ‘by a screw
[2 made of non-magnetic material. The disc ll
ismagnetically separated from the body of the
e?icient operation of the system. Obviously the
core by a gap in a direction across the ?ow of
building up or development of residual magnetism
the'?ux. This gap is occupied by a sheet l3 of
will seriously interfere with the proper and safe 7 4.5 non-magnet material and the disc is of the small
operation of the system.
i
est physical permissible thickness.
It will be understood that the foregoing gen
.All magnets, whether direct current or alter
eral description and the following detailed de
nating current, retain a certain amount of mag
scription are exemplary and explanatory of the
netism, known as residual magnetism, when the
invention but are not restrictive thereof. In ad 5.0 magnet winding is open circuited. It is well
dition to the foregoing other objects and. advan- '
known to provide gaps in stationary magnet sec
tages will become apparent as this speci?cation
tions to reduce the power of the retained mag
proceeds. Referring to the drawing forming a
netism. However, in the prior art the sections so
part thereof and in which one embodiment of, the
divided are comparatively large and retain sul?
invention is illustrated:
cient residual magnetism so that considerable
2,41 2,804
4
3
points where they engage the movable contact
mechanical force is required to separate the mov
able and stationary magnetic sections when the
members 38 the screws 42 may be loosened, the
contacts 40 turned to provide a new face on said
coil is open circuited.
?xed contact members 40 to engage the movable
contact members 35.
As illustrated in Figure 1, when the coil is ener
gized and contact is being made, springs 37 are
tensioned. Upon the de-energization of the coil
The thin ?anged disc ll separated from the
core 6 by the sheet of non-magnetic material l3
provides a magnetic contact surface for the mov
able section 8, but retains only a light magnetic
polarization on account of its small size, thus
readily permitting the separation of both mag
6, the tensioned springs 31‘ will function together
10 with the force of gravity stored in the armature
netic sections when the coil is deenergized.
to return the armature to its de-energized posi
A modi?cation of this feature is illustrated in
tion, thereby separating the contact members.
Fig. 3 in which a thin plate I4 is attached to the
movable section of the magnet, the plate being
Usually a stop is provided to limit the movement
magnetically separated by means of a gap in a
of the armature after it has been released. How
direction at right angles to the ?ow of the flux. 15 ever, considerable rebounding occurs on all
The gap space may be occupied with any non
known magnets. This is objectionable due to
magnetic metal l5, which, with the plate l4, may
the noise and causes undue wear _and tear on the
readily be secured to the surface of the movable
parts. To insure a noiseless release and elimi
section by resistance welding.
nate rebounding of the armature in its released
The flanged disc ll also acts to simplify the 20 position, and to prevent undue wear and tear, a
mechanical structure of the electromagnet, the
simple means for gradually absorbing the release
?ange thereof functioning as a means to hold
momentum of the armature is provided.
the conventional winding IS on its core 5, thus
Secured between the upper extension of mem
dispensing with other means to hold the winding . ber 30 and angle 3! by the bolt 32 is a spring
in place.
25 ?nger 45. This spring ?nger engages a radial
A shading coil I1 is set into the disc It as shown
shoe 46 which is adjustably mounted on the
in Figs. 1 and 2. To increase the pull and obtain
upper portion of arm 43 and held in position
a quiet operating magnet it is desirable to permit
there by a screw 4?. I As it is ‘apparent from Fig
only the disc area l8 surrounded by the shading _ . ures 1 and 3, the spring ?nger 45 will engage shoe
coil to come in contact with the armature. For 30 46 with increasing tension as the armature moves
that purpose the area i8 as shown in Fig. 1 is a
away from its coil due to its construction and
trifle higher than the balance of the surface area
method of support in relation to the member 38.
of the disc. As shown in Fig. 3 the. end of the
The spring ?nger is so shaped that it will engage
core or its disc may be ?at in its entirety and the 7
the radial shoe when the coil is de-energizecl and
plate l4 suitably shaped to accomplish the same 35 the armature starts to move away from the core.
result.
The spring ?nger 45 will thus engage its shoe 658
The armature or movable section 8 may com
only after the contacts 36 and 4!] have been sepa
prise a series of laminated plates 2!. The outside
rated and will bring the armature to a gradual
plate 22 of the laininations extends upwardly.
and noiseless stop. When the coil is energized
and its uppermost section is bent over to form
and the armature is pulled toward the stationary
a hook-portion 23. This hook portion extends
magnet section, spring ?nger 45 does not have
over and is suspended on the top of the lip 9,
the support of member 30 and it may readily
thus forming the hinge or pivot for the armature.
?ex and is therefore considerably weaker in its
An car 24 bent outwardly from the lip 9 passes ~
friction pressure against the shoe, and thereby
through a clearance slot 25 to prevent undue 45 permitting the armature to pull freely toward the
lateral movement of the armature in relation to
stationary magnet section.
its coil while not interfering with the normal
The position of the shoe 46 may be adjusted
movementof the armature toward and away from
and a stop 48 is provided on the end of the shoe
its coil.
in case the spring ?nger weakens or gets out of
A channel-shaped or ribbed reinforcing mem
ber 39 is secured to the armature and extends
upward therefrom. This upward extension car
adjustment.
Changes in details of construction and ar
rangement of parts such as would occur to one
skilled in the art are to be considered as coming
ries the movable contact means and also the
means for absorbing the momentum of the arma
within the spirit of the invention as set forth in
55 the appended claims.
ture when its coil is deenergized.
An angle 3| has one of its legs bolted at 32 to
I claim:
the upward extension of the member 30, and
1. An electromagnet comprising a static-nary
secured to the other leg of the angle 3| is a block
magnetic section embodying a core and a winding
‘of insulation 33. Mounted'on the under side of
therefor, a thin disc non-magnetically secured to
the block of insulation 33 is a pair of ?xed blades 60 the top of said core, a sheet of non-magnetic ma
34 in which headed studs 35 are mounted. These
terial interposed between said disc and the body
studs pass through clearance holes in movable
portion of said core, an upwardly extending lip
contact members 36 which are urged toward the
formed at or near the edge of the horizontal leg
blades 34, as shown in Fig. 3. by springs 3'! sur
of said stationary magnetic section, a movable
rounding the studs 35. ’
magnetic section, a hook portion formed on said
With the parts in the position of Fig. l the coil
movable magnetic section, said hook portion ex
is energized, the armature is attracted and the
tending over and suspended from said upwardly
movable contact members 36 are spring pressed
extending lip to permit free pivotal movement of
against ?xed contact ‘members 40. The ?xed
said. movable magnetic section in relation to said
contact members 48 are secured to a pin 4| by 70 stationary magnetic section and permit of said
screws 42, the pin being formed‘ of insulating
movable magnetic section being lifted from said
material and carried by anarm 43 suitably se
stationary magnetic section, means for prevent
cured to the rear side of the vertical leg of the
ing lateral movement of said movable magnetic
angle 5. When the annular parts of the ?xed , section in relation to said stationary magnetic
contact members 40 become worn or burnt at the 75 section, and means for gradually absorbing mo
is
5
2,412,304
mentum of said movable magnetic section when
the electromagnet is open circuited and said mov
able magnetic section
moving away from said.
stationary magnetic section, said means compris
ing a flexible spring carried by said movable mag
netic section, and a radial shoe carried by said
stationary magnetic sec’: on, said spring engaging
said shoe w‘"
moving a
6
terial interposed between said disc and the body
portion of said core, a shading coil set into said
disc, the area of said disc surrounded by said
shading coil being a tri?e higher than the area of
the rest of said disc, a movable magnetic section
freelysection,
netic
pivoted and
in relation
means for
to said
gradually
stationery
absorbing
said movable magnetic section is
,' prom said stationary
tion.
momentum of said movable magnetic section
gnetic secwhen the electromagnet is open cii'cuited and said
10 movable magnetic section is moving away from
2. An electromagnet comprising a stationary
magnetic section embodying a core
a wind
said stationary magnetic section, said means com
prising a ?exible spring carried by said movable
magnetic section, and a radial shoe carried by said
ing therefor, a thin disc non~magnetica1ly se
cured to the top or said core, a sheet or” non-mag
static-nary magnetic section, said spring engaging
netic material interposed between said disc and 15 said shoe when said movable magnetic section is
the body portion of said core, a sanding coil set
moving away from said stationary magnetic sec
into said disc, the area of the disc surrounded
tion.
by said shading coil being a tri?e higher than the
5. An electromagnet comprising a movable
area of the rest of said disc, an upwardly extend
magnetic section and a stationary magnetic sec
ing lip formed at or near the edge of the hori~ 20 tion, an upwardly extending lip formed on said
zontal leg of said stationary magnetic section, a
stationary magnetic section, a hook-portion
movable magnetic section, a hook portion formed
formed on said movable magnetic section, said
on said movable magnetic section, said hook por~
hook-portion extending over and suspended from
tion extending over and suspended from said up“
said upwardly extending lip to permit free pivotal
wardly extending lip to permit free pivotal move 25 movement of said movable magnetic portion in
ment or said movable magnetic section in relation
relation to said stationary magnetic section and
to said stationary magnetic section and permit of
permit of said movable magnetic section being
said movable magnetic section being lifted from
lifted from said stationary magnetic section, and
said stationary magnetic section, means for pre
means for gradually absorbing momentum of said
venting lateral movement of said movable mag 30 movable magnetic section when the electromag
netic section in relation to said stationary mag~
net is open circuited and said movable magnetic
netic section, and means for gradually absorbing
section is moving away from said stationary mag
momentum of said movable magnetic section when
netic section, said means comprising a flexible
the electromagnet is open circin‘ted and said mov
spring carried by said movable magnetic section,
able magnetic section is moving away from said 35 and a radial shoe carried by said stationary mag
stationary magnetic section, said means compris
ing a ?exible spring carried by said movable mag
netic section, and a radial shoe carried by said
netic section, said spring engaging said shoe when
said movable magnetic section is moving away
from said stationary magnetic section.
stationary magnetic section, said spring engaging
6. An electromagnet comprising a movable
» said shoe when said movable magnetic section is 40 magnetic section and a stationary magnetic sec
moving away from said stationary magnetic sec
tion, an upwardly extending lip formed on said
tion,
stationary magnetic section, a hook portion
3. An electromagnet comprising a stationary
formed on said movable magnetic section, said
magnetic section embodying a core and a winding
hook-portion extending over and suspended from
therefor, a thin disc non-magnetically secured to 45 said upwardly extending lip to permit free pivotal
the top of said core, a sheet of non-magnetic ma
movement of said movable magnetic portion in
terial interposed between said disc and the body
relation to said stationary magnetic section and
portion of said core, a movable magnetic section
permit of said movable magnetic section being
freely pivoted in relation to said stationary mag
lifted from said stationary magnetic section,
netic section, and means for gradually absorbing
means for preventing lateral movement of said
momentum of said movable magnetic section
movable magnetic section in relation to said sta
when the electromagnet is open circuited and
tionary magnetic section, and means for gradu—
said movable magnetic section is, moving away
ally absorbing momentum of said movable mag
from said static-nary magnetic section, said means
netic section when the electromagnet is open cir
comprising a ?exible spring carried by said mov~ . cuited and said movable magnetic section is mov
able magnetic section, and a radial shoe carried
ing away from said stationary magnetic section,
by said stationary magnetic section, said spring
said means comprising a flexible spring carried by
engaging said shoe when said movable magnetic
said movable magnetic section, and a radial shoe
section is moving away from said stationary mag
carried by said stationary magnetic section, said
netic section.
spring engaging said shoe when said movable
4. An electromagnet comprising a stationary
magnetic section is moving away from said sta
magnetic section embodying a core and a winding
tionary magnetic section.
therefor, a thin disc non-magnetically secured to
the top of said core, a sheet of non-magnetic ma
MARSELLUS STALEY.
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