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Патент USA US3033967

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May s, 1962
J. K. DEAN, J R
3,033,957
ELECTROMAGNETIC RELAY
Filed July l2, 1960
2 Sheets-Sheet l
SWITCH ARM N0.I
TERMINAL
INVENTOR'l
JOHN K. DEAN JR.,
BW . MMM
,
¿ST ATTORNEY.
May 8, 1962
J. K. DEAN, .JR
3,033,957
ELEOTROMAGNETIC RELAY
Filed July 12, 1960
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2 Sheets-Sheet 2
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JOHN K. DEAN JR.J l
BM ATTORNEY.
.lite States Fatet dice
3,033,957
Patented May 8, 1962
1
2
3,033,957
of an electromagnetic relay in accordance with the inven
ELECTRGMAGNETIQ RELAY
John K. Dean, lr., Lynchburg, Va., assigner to General
Electric Company, a corporation of New York
Filed .Iuly 12, 1969, Ser. No. 42,263
6 Claims. (Cl. 20G-104)
The invention relates to an electromagnetic relay, and
particularly to an electromagnetic four-pole double-throw
relay that may have relatively small dimensions.
In the electronic and related industries, the present
trend is to miniaturize the apparatus as much as prac
tically possible. However, despite such miniaturization,
tion. The relay comprises a base or header 1d which
may be formed of a magnetic material having a flat
upper surface and a recessed lower surface as shown.
The base 10 is preferably rectangular in shape and serves
to support the relay structure and also serves to support
external contacts. A cover 12, shown in cross section,
may be provided and suitably fastened to the base 10 in
order that the relay may be hermetically sealed. A frame
14 made of a suitable magnetic material is mounted above
the base 1t). The frame 14 may be formed from a flat
sheet which is cut and shaped to provide a three sided,
generally U-shaped, structure when viewed from above.`
the electrical and mechanical demands on the apparatus
The frame 11i» includes two long sides 16 which extend
remain the same, or even increase, with respect to the 15 along the length of the base 10, and which are generally
demands on previous relatively large apparatus. Conse
parallel to each other and to the long sides of the base 10
quently, an effort is presently being made to miniaturize
and which lie in planes perpendicular to the upper surface
such apparatus and at the same time provide such appara
of the base lil. The two long sides 16 are joined at one
tus with increased capability and durability. However, a
end by a short side 1S which lies in a plane perpendicular
limitation on >the ability to miniaturize may exist because
to the two long sides 16 and to the upper surface of the
of the frequent requirement that the apparatus be capable
base lll. The frame 14 is supported by and fastened to
of handlingy an appreciable current and voltage. In the
the upper surface of the base 1G by four legs or supports
case of electromagnetic relays, while miniaturization has
2li, these legs 2d being cut (out of the frame material if
been achieved with relays capable of handling several
desired) and first bent inward and then downward so that
amperes of current, it is believed that it has not been pos 25 they extend downward from the frame 14 some distance
sible to accomplish this with relays having more than
in from the edges of the vbase 10 as shown more clearly
two poles.
.
in FIGURE 2. The legs 20 may be welded to the base
Accordingly, it is an object of the invention Ito provide
a novel electromagnetic four~pole double-throw relay
having an arrangement of parts so that it can be con
structed to have relatively small physical dimensions.
Another object of the invention is to provide a rela
tively small electromagnetic four-pole double-throw relay
- that is rugged, and that is capable of switching and carry
le. The two long sides 16 of the frame 14 are suitably
notched near their center and at the lower edge to provide
30 adjustable stops 22.
The function of these stops 22 will
be explained in detail hereinafter. The two long sides 16
of the frame 14 are also provided with suitable openings
24 for receiving and holding a retainer spring as will also
be explained in detail hereinafter. An elongated cylin
ing appreciable amounts of electrical current.
35 drically shaped core 26 of magnetic material is positioned
These and other objects are accomplished in accordance
between the two long sides 16 of the frame 14 and is
with the invention by an electromagnetic relay which,
fastened at one end to the central portion of the inner
briefly, comprises an elongated Core about which is wound
surface of the short side 1S. This core 26 extends for
a coil. rl`he core and coil are mounted in a frame sup
the length of the two long sides 16 of the frame 14. The
ported by and above a base. Between the frame and the 40 free end of the core 26» and the free ends of the long sides
base are loca-ted at least four movable switch arms each
having two associated fixed contacts. The switch arms
and their contacts are mounted on terminals supported
1€» of the frame 14 preferably lie and terminate in a com
mon plane as seen in FIGURE l. A coil spool or form
2S made of a suitable material such asV plastic is wound
by the base and have their free ends located centrally
with an operating coil 3€) which is comprised of a suitable
above the base in the same general area. An L-shaped 45 number of turns or windings brought out on leads 31.
armature is pivoted about a point or axis at a lower
rilie coil form Zd and its coil 30 are dimensioned so that
corner of the frame. The armature is provided with an
they can pass over or around the core 26 and between
actuator which, when the armature is operated in re
the free or open ends of two long sides 16 of the frame
sponse to encrgization of the coil, serves to move all four
14. The vertical surfaces of the free ends of the long
of the free ends of the switch arms between their respec 50 sides 16 of the frame 14 may be provided with notches
tive contacts.
29 to receive a support (not shown) of non-magnetic ma
The invention will be better understood from the fol
terial which is positioned in the notches 29 and fastened
lowing description taken in connection with the accom
to the long sides 16 and to the `free end of the core 26 to
panying drawing and its scope will be pointed out in the
provide additional strength to the relay structure.
55
claims. In the drawing:
The magnetic circuit of the relay in accordance with
FlGURE l shows a side elevation view, partly in sec
tion, of a preferred embodiment of an electromagnetic
relay in accordance with the invention;
FIGURE 2 shows an end elevation view of the electro
magnetic relay of FIGURE 1;
the invention comprises an armature 32 which may be
generally described as being L-shaped. lIn addition to
being shown in FIGURES 1 and 2, the L-shaped arma
ture 32 is shown in the perspective View of FIGURE 3.
60 The armature 32 comprises a ñrst or actuator arm 34
FIGURE 3 shows a perspective View of the armature
and a second or magnetic operating arm 36. These
and its actuator; and
arms 34, 36 are comprised of flat sheet-like magnetic ma
FIGURE 4k shows a plan view of the base of the relay
terial, and lie in respective planes which meet at an angle
of FIGURE l and the location of the terminals and ar
to form a corner. As shown in FIGURE 1 the interior
65 angle so formed is approximately but not necessarily
rangement of certain contacts.
In the figures, the same reference numerals refer to
102 degrees. The actuator arm 34 of the armature 32
the same parts. With reference to FIGURES 1 and 2,
is, as shown in FIGURE 3, generally T-shaped, and
there are shown side and end elevation Views respectively
includes a crosspiece 35 which is provided to restrict
3,033,957
¿E
movement of the armature 32 in the upward direction
of movement by engaging or striking the stops 22 of the
be glass or other suitable material that holds the ter
minals 48 in a strong insulated relationship with respect
frame 14.
to the base 10.
The crosspiece 35 also serves as means for
fastening an actuator 4t) thereto. The actuator 40 is
made of a flat strip of insulating material such as ceramic
or plastic and is provided with a longitudinal slot 41
and a transverse opening 42`which permit the actuator
FIGURE 1 shows a cross sectional view
of one of the terminals 48 and its insulator 50.
The
terminal designations (i.e., the relay elements to which
they are connected) are given in the figures.
In FIGURE
40 to be slipped upward from beneath the crosspiece 35
4, it will be seen that the terminals 48 are laid out in
a grid pattern or arrangement in three rows along the
and fastened thereto by suitable means such as cement.
Attaching the actuator 40 from beneath is desirable as
it serves to place the actuator 40 in compression (which
prises four switch arms S2 which are formed from a ilat
strip of resilient material having good electrical conduc- ~
long dimension of the base 1th The relay shown com
can be easily withstood) when the relay is operated.
tivity such as an alloy of silver, magnesium, and nickel.
Thus, the actuator arm 34 of the armature 32 is provided
The switch arms 52 are fastened by means of brackets
54 to their respective terminals 48 which are located at
both ends of the two outer rows (i.e., at the corners of
the base 10). The switch arms 52 extend inward in di
with an actuator 40 which moves in accordance with
movement of the armature 32 but which is electrically
insulated from the armature 32.
The magnetic operating
rections substantially parallel to the long sides of the
arm 36 of the armature 32 may be generally rectangular
base 10 and to the long sides 16 of the frame 14 to»
in shape and is provided with a Vrounded portion 37 and
ward the central area of the base 10 between the base
two tabs 38.'V The'two tabs 3S lie in substantially the
same >'plane a'sthe actuator arm 34. As shown in FIG 20 10 and the frame 14. As shown in FIGURE 2, the
`switch arms 52 are outside of the legs 20 of the frame
URE 1, the armature 32 is positioned with the actuator
14. The free ends of the switch arms 52 terminate in the
arm 34 between the frame 14 and the upper surface
vicinity of the actuator 40 of the armature 32 so as to be
of the base 10, and with the magnetic operating arm
operated in response to the downward motion of the
36 in the vicinity of the free ends of the two long sides
16 of the frame 14 and in the vicinity of the free end 25 actuator 40. When the armature 32 is in its normal
position as shown in FIGURE 1, the switch arms 52 are
of the core 26. The pivot point or axis of the armature
spaced from the actuator 40, the crosspiece 35, and the
32 is provided by the interior or inside corners of the
actuator arm 34. Associated withY each switch arm 52
angle formed by the two tabs 38 and the magnetic op
is a normally closed contact 56 positioned above the free
erating arm 36 of the armature 32 which rest against the
corner formed generally by the lower portions of the free 30 end of the switch arm 52 and fastened to support ter
minals 60 which are located near the center of the base
ends of the long sides 16 of the frame 14, and formed
10 and held by the insulators 50. The additional sup«
specifically by the portions of the legs 20 which are bent
port terminals >60 for the normally closed contacts 56
inward from the free ends of the long sides 16 of the
are not essential, but may be provided to make the relay
frame 14. The armature 32 is normally retained in the
more rugged. The support terminals 60 do not extend
position shown in FIGURE 1 (that is with the ends of
beneath the lower surface of the base 10 for external
the crosspiece 35 resting against the stops 22) by means
connection as they are provided only as support for the
of a retainer spring 44. 'I‘he retainer spring 44 is formed
normally closed contacts 56. The normally closed con
, of a suitable wire and is given a shape which, in one
tacts 56 are shaped and bent as shown in the figures so
sense, may be described as being W-shaped as will be
seen in FIGURE 2. The free ends of the W-shaped 40 as to be fastened to their respective external terminals
48. FIGURE 4 shows particularly how each of the nor
configuration are bent to tit into the retainer spring open
mally closed contacts 56 is connected to a support ter
ings 24 in the long sides 16 of the frame 14, and the
central apex of the W-shaped contigurationris bent to
minal 60 as well as to an external terminal 48 so as to
rest in a depression 46 positioned on or near the exterior
provide external connections for the normally closed con
tacts 56. Also associated with each switch arm 52 is
portion of the corner of the armature 32 formed by the
magnetic operating arm 36 and the actuator arm 34. 45 a normally open contact 58 positioned below the free
The retainer spring 44 is so shaped and biased that it
end of the switch arm 52. The normally open contacts
58 are fastened directly to their external terminals 48 in
urges the armature 32 to normally take the position
shown in FIGURE l.
the two outer rows. The coil leads 31 are attached to
The magnetic flux path for the electromagnetic relay
their external terminals 43 in the center row.
The nor
of the invention includes the core 26, the short side 18 50 mally open contacts 58 are shown in FIGURE 1, and
of the frame 14, the two long sides 16 of the frame 14,
the magnetic operating arm 36 of the armature 32, and
finally the air gap between the magnetic operating arm
36 and between the free ends of the core 26 and the long
sides 16 of the frame 14. When the coil 30 i-s energized, 55
the magnetic flux produced thereby draws the magnetic
operating arm 36 to the left as viewed in FIGURE 1 to
ward the free ends of the core 26 and the two long sides
16. This movement causes the armature 32 to rotate
since they do not have a peculiar configuration, they do
not need the additional support provided for the normal
ly closed contacts 56.
The switch arms 52 are biased or arranged so that their
free ends normally tend to bend upward away from the
base 1t) to engage or contact their respective normally
closed contacts 56 as shown. When the relay coil 30
is energized, however, the armature 32 pivots in a counter
clockwise direction about its pivot point or axis and the
in_a counterclockwise direction about its pivot axis until 60 actuator 49 on the actuator arm 34 moves downward
the magnetic Operating arm 36 rests against the free ends
and strikes the free ends of the four switch arms 52 and
or as closely as possible thereto, of the core 26 and the
moves the switch arms 52 downward until they break
long sides 16. When the armature 32 is so rotated,
it will be seen that the actuator 40 and the crosspiece
contact with their respective normally closed contacts
56 and make contact with their respective normally
35 of the actuator arm 34 are moved downward or in a 65 open contacts 58.
counterclockwise direction about the pivot axis of the
armature 32. This movement of the crosspiece 35 and
The counterclockwise movement of
the armature 32 is restricted by the magnetic operating
arm 36 striking or contacting the free ends of the long
the actuator arm 34 is utilized to effect switching of
sides 16 of the frame 14 and the magnetic core 26. As
the contacts in the electromagnetic relay.
v
persons skilled in the relay art will appreciate, some
The location of external terminals 48 for the relay 70 slight additional travel is provided after the switch arms
contacts, for the switch arms, and for the coil terminals
52 contact the normally open contacts 58 to insure good
are shown inthe plan view of FIGURE 4 in addition to
contact and some wiping action. The actuator 40 will
being shown in FIGURES 1 and 2. The external ter
hold the switch arms 52 in the position just described
minals 48 extend through the base 10 and are insulated
as long as the coil 30 is energized. When the coil 30 is
therefrom by means of suitable insulators 5i) which may 75 no longer energized, the bias provided by the retainer
‘3,033,957’
spring 44 and the switch arms 52 causes the armature
32 to pivot in a clockwise direction about its pivot axis
and thus permits the switch arms 52 to move upward
6
ing an appreciable amount of electrical current. While
the invention has been described with reference to a
particular embodiment, it is to be understood that modi
iications may be »made by persons skilled in the art with
out departing from the spirit of the invention or from the
and break contact with their respective normally open
contacts 58 and make contact with their respective
normally closed contacts 56 once again, Some wiping
scope of the claims.
action is desirable in this operation also. The clockwise
What I claim as new desire to secure by Letters Patent
movement of the armature 32 is restricted by the cross
ofthe United States is:
piece 35 which strikes the stops 22. on the long sides
l. An electromagnetic relay comprising a base, a frame
16 of the frame 14.
10 mounted on and above said base, a core of magnetic ma
Persons skilled in the relay art, particularly such per
terial mounted on said frame, a coil wound on- said core,
sons engaged in relay manufacturing, will appreciate
a generally L-shaped armature of magnetic material corn
the advantages offered by a relay in accordance with the
prising la -fñrst arm and a second arm which meet at an
invention. In the manufacture of a relay in accord
angle to form a corner, said armature being positioned
ance with the invention, the location and attachment ot
'with said ñrst arm between said frame and said base,
the normally closed and normally open contacts asso
with said second arlm in the vicinity of said core, and
ciated with all four switch arms may be made before the
with an interior portion of said corner contacting a corner
attachment of the frame and its associated parts to the
of said frame to pivot thereabout, an armature retainer
ba-se. The frame, when attached to the base, forms
a rigid assembly. The free end or face of the core 20 comprising a generally W-shaped elongated element hav
ing its outer ends fastened to said frame and having its
may be ground before the coil and form are placed on
inner vertex contacting an exterior portion of said corner
the core and the armature is placed in position. The
of said ar-mature to cause said interior portion of said
armature may be pre-formed to the correct dimension
corner
of said armature to bear »against said corner of
relative to the core and the free ends of the switch
said frame, a movable switch arm mounted at each
arms which move between the eight stationary contacts.
corner of said base and generally extending toward the
The actuator may be relatively small and light since,
centr-al portion of said base between said base and said
when operated, it is subjected only to compressive forces
coil and frame, said switch arms being positioned with
which are easily withstood by refractory ceramic ma
relation to said first arm of said armature so as to be
terials. The free ends of the four switch arms are
moved in response to movement of said armature, and
grouped together near the center area of the relay so that
30 contacts ‘associated with each of said switch arms.
the single, small light actuator may move them simulta
2. An electromagnetic relay comprising a base, a frame
neously and directly such that the forces on each switch
arm remain balanced one against the other.
The arma
ture pivot axis is located substantially at the same- vertical
level and perpendicular to the motion of the four switch
mounted on and above said base, a core of magnetic ma
terial mounted on said frame, a coil wound on said core,
a generally L-shaped armature of magnetic material com
prising a tîrst arm and a second arm which «meet at an
arms so that the wear from sliding between the actuator
angle to form a corner, said armature being positioned
and the switch arms is a minimum. The armature may
with said iirst arm between said frame and said base and
be arranged so that the actuator pushes the switch arms
with said second arm in the vicinity of said core, means
at a point removed from the contact itself, thus provid
ing an action which is conservative in its utilization of 40 pivotally mounting said armature adjacent a corner of
said frame, said mounting means including an element
force and motion from the coil and core. This type
of action is elïective in lessening contact bounce both
on pickup and dropout functions of the relay. vThe
stationary contacts may be made from composite con
tact and base metal which may be punched from ñat
stock and formed into a domed contact.
The contacts
may be trimmed to the desired length subsequent to
their attachment to the base and subsequent to posi
tioning and adjustment of normally closed contact pres
that engages and supports said armature at substantially
a point on said corner, a plurality of movable switch
arms mounted adjacent the ends of said base and gen
erally extending toward the central portion of said base
between said base and said coil and frame, means carried
by said ñrst Iarm of said armature and engageable 'with
said switch arms, and contacts associated with each of
said switch arms.
The arrangement of the contacts and switch arms
3. An electromagnetic relay comprising a rectangular
around the perimeter of the base and the horizontal
base, la frame mounted on and above said base, a core of
magnetic material mounted on said frame, a coil wound
on said core, a generally L-shaped armature of magnetic
material comprising a first arm and a second arm which
meet at an angle to lform a corner, said armature being
sure.
orientation of the contact gaps both make the contacts
and switch arms easily accessible for adjustment, clean
ing, and inspection. The configuration of the base per
mits a small area to carry 14 terminals on a small
grid spacing which is symmetrical and reversible in a 55 positioned with said ñrst arm between said frame and said
base, with said second arm in the vicinity of said core,
plug-in socket and which requires no polarization of the
and with an interior portion of said corner contacting a
terminals. The small number of different parts, the in
dependence in manufacturing tolerances, the squence of
manufacturing operations, the multiplicity of functions
portion of a corner of said frame to pivot thereabout, an
armature retainer comprising a generally W-sh-aped elon
performed by each part, and the arrangement of the parts 60 gated element having its outer ends fastened to said frame
and having its inner vertex contacting an exterior por
all combine to make an improved relay.
tion of said corner of said «armature to cause said interior
The relay described above has been successfully built
portion of said corner of said armature to bear against
and operated with an embodiment of small dimensions.
said corner of said frame, a plurality of elongated mov
For example, a relay having the four switch arms shownA
was built with dimensions which were approximately 1.0 65 able switch iarms formed of a flat strip of material, means
inch long, 0.8 inch high, and 0.6` inch wide. The termi
nals were spaced 0.2 inch in each direction from each
for fastening one end of each of said arms at a respec
tive corner of said base with the other end of each of
said arms extending toward the central portion of said
other. This relay provided contacts and switch arms
base between said Ábase and said coil and frame, said
capable of switching two amperes at 28 volts direct cur
other ends of said switch arms being positioned in the
rent. Further, this relay was extremely rugged, and op 70
vicinity of each other and near said ñrst arm of said arma
erated after being subjected to shock in the order of 50
ture so as to be -moved in response to movement of said
G’s of magnitude. Thus, it will -be seen that the relay
armature, and contacts associated with each of said switch
meets the needs and desires for miniaturized equipment
arms and positioned to be contacted by said switch arms
and, at the same time, provides a relay capable of switch 75 in response to movement of said switch arms.
3,033,957
0
O
ends of said two parallel sides of said frame so as to
4. An electromagnetic relay comprising a rectangular
base Ihaving a surface boun-ded by two parallel long sides
pivot thereabout, means coupled to said long sides of said
frame and engaging said armature to cause said armature
and two parallel short sides, a U-shaped frame of mag
netic material mounted on and above said base by legs,
said frame comprising three sides lying in planes which
are perpendicular to said surface of said base, two of
said three sides of said frame being parallel to each
other and to said long sides of saidv base and being joined
at one end by the third of said three sides of said frame
Ut
to assume said pivot position and to pivot >in response
to >energization and deenergization of said coil, a switch
terminal located in the vicinity of each of the corners
of said base, a plurality of switch arms formed of elon
gated fiat material, means fastening one end of each of
said switch arms to a respective one of said switch termi
which is perpendicular to said two parallel sides of said 10 nals with said switch arms extending inward therefrom
substantially parallel to said long sides of said base toward
frame, an elongated core of magnetic material positioned
the center of said base so that the free ends of said
between and extending the length of said two parallel
switch arms are located generally in the vicinity of the
sides of said frame with one end of said‘core fastened to
said third side of said frame, a coil wound on said core,
free end of said first arm of said armature, an actuator
an L-shaped armature of magnetic material comprising a
first arm and a second arm which lie in respective planes
positioned on said free end of said first arm of said arma
ture and arranged to contact each of said free ends of
said switch arms and to operate said switch arms in
response to movement of said armature, and a pair of
that intersect at an angle to form a corner, said arma
ture being positioned with said first arm located between
said coil and said base, with said second arm located in
the vicinity of the free end of said core, and with interior
portions of said corner of said armature contacting ex
terior corners of the free ends of said two parallel sides
of said frame and portions of two of said legs so as to
pivot thereabout, a retainer comprising a generally W
shaped 'wire having its outer ends respectively fastened to
said two parallel sides of said frame and having its inner
vertex engaging an exterior portion of said corner of
contacts positioned in the vicinity of each of said free
ends of each of said switch arms, said contacts being
arranged above and below said switch arms respectively.
6. An electromagnetic relay comprising a rectangular
base having a surface, bounded by two parallel long sides
and two parallel short sides, a U-shaped frame of mag
netic material mounted on and above said base -by a
plurality of legs, said yframe comprising three sides lying
in planes which are perpendicular to said surface of said
base, two of said three sides of said frame being parallel
said armature to cause said interior portions of said
to each other and to said long sides of said base and
corner of said armature to bear against said exterior
corners of said two parallel sides of said frame and to 30 being joined at one end by the third of said three sides
of said `frame which is perpendicular to said two parallel
cause said first arm of said armature to tend to bear
sides of said frame, an elongated cylindrical core of
against said coil and said two parallel sides of said frame
and said leg portions when Said armature is in its normal
magneticV material positioned between and extending the
position, said armature being operated by energization of
length of said two parallel sides of said frame with one
end of said core fastened to said third side of said frame,
said coil to cause said first arm of said armature to tend
to move laway from said coil andr said two parallel sides
of said iframe, a switch terminal located in the vicinity
of >each of the four _corners of said base, a plurality of
switch arms formed of elongated flat material, means
fastening one end of each of said switch arms to a re
a coil wound on said core, an L-shaped armature of mag
netic material comprising a first arm including an actu
ator arm and tabs and a second arm, said first and
second arms lying in respective planes that interesect at
40 an angle to form a corner, said armature being posi
located generally in the vicinity of the free end of said
tioned with said first arm located between said coil and
said base, with said second arm located in the vicinity of
the free end of said core, and with interior portions of
said lcorner of said armature formed by said tabs of
said first arm and by said second arm contacting por
first arm of said armature, an actuator positioned on said
tions of said legs in the vicinity of the free ends of said
spective one of said switch terminals with said switch
arms extending inward therefrom substantially parallel
to said long sides of said base toward the center area of
said base so that the free ends of said switch arms are
two parallel sides of said `frame so as to pivot about said
-free end of said first arm. of said armature and arranged
leg portions, a retainer comprising a generally W-shaped
to contact each of said free ends of said switch arms
wire having its outer ends respectively fastened to said
and to operate said switch arms in response to movement
of said armature, and a pair of contacts positioned in the 50 two parallel sides of said -frame and having its inner
v vertex engaging an exterior portion of said corner of
vicinity of each of said free ends of each of said switch
said armature to cause, when said armature is in its
arms, said contacts being arranged above and below said
normal position, said interior portions of said corner of
switch arms respectively.
said armature lto bear against said leg portions and to
5. An electromagnetic relay comprising a rectangular
cause said first arm of said armature tol tend to bear
base having a surface bounded by two parallel long sides
against said coil and said two parallel sides of said frame,
and two parallel short sides, a U-shaped frame of mag
a switch arm terminal located in the vicinity of each of
netic material mounted on and above said base by legs,
said frame comprising three sides lying in planes which
the four corners of said rectangular base, a plurality of
switch arms formed of elongated ñat material, means
are perpendicular to said surface of said'base, two of said
fasteningone end of each of said switch arms to a re
three sides of said frame being parallel to each other
spective one of said switch arm terminals with said
and to said long sides of said base and being joined at
switch arms extending inward therefrom substantially
one end by the third of said three sides of said frame
parallel to said long sides of said base toward the center
which is perpendicular to said two parallel sides of said
frame, an elongated core of magnetic material positioned
area of said -base so that the free ends of said switch
between and extending the length of said two parallel 65 'arms are located generally in the vicinity ofthe free end
sides of said frame with one end of said core fastened to
of said actuator arm of said armature, an actuator posi
said third side of said frame, a coil wound on said core,
tioned on the yfree end of said lactuator arrn of said arma
an L-shaped `armature of magnetic material comprising a
ture and arranged to contact each of said free ends of
first arm and a second arm which lie in respective planes
said switch arms and to operate said switch arms in
that intersect at an angle to form a corner, said armature 70 response to movement of said armature, a normally closed
being positioned with said first «arm located generally
contact positioned in the vicinity of each of said free ends
of each of said switch arms between said switch arms
between said coil and said base, with said second arm
and said frame, said normally closed contacts being
located in the vicinity of the free end of said core, and
arranged to contact their respective switch arms when
with interior portions of said corner of said armature
contacting portions of two of said legs near the free> 75 said armature is in its normal position and to be spaced
3,033,957
9
from said switch arms when said armature is in its
operated Iposition, and a normally open contact positioned
in the vicinity of each of said free ends of each of said
switch arms between said switch arms and said base, said
normally open contacts being arranged to be spaced from
said switch arms when said armature is in its normal
position »and to contact their respective switch arms when
said armature is in its operated position.
References Cited in the ñle of this patent
UNITED STATES PATENTS
2,913,548
2,918,547
2,929,001
2,965,739
2,969,444
Martin ______________ __ Nov. 17,
Titus _______________ __ Dec. 22,
Wallace ____________ __ Mar. 15,
Alexandersson _______ __ Dec. 20,
Deissler ____________ __ Jan. 24,
1959
1959
1960
1960
1961
: UNITED STATES
PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No. 3„o33,957
May 8l, 1962
John K. Dean„ Jr.,
It is hereby certified that error appea
ent requiring
correction and
corrected below.
rs in the above numbered pat-~
that the said Letters Patent should’read as
5V 2i,
line
58, "said"
for "squence" read ---- sequence -~~;
columnColumn
8„ line
after
*_
`--~0
y first occurrencm insert
(SEAL)
Attest:
ES'I'ON G. JOHNSON
Attesting Officer
DAVID L. LADD
Commissioner of Patents
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