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Патент USA US2405923

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Aug. 13, 1946.
E. G. HENRY
MERCURY SWITCH RELAY
Filed Nov. 18, 1942
2,405,923
Patented Aug. 13, 1946
2,405,923
UNITED STATES PATENT OFFICE
2,405,923
MERCURY SWITCH RELAY
Earle G. Henry, Wilmette, Ill., assignor to Buckley
Music System, 'Inc., a corporation of Illinois
Application November 18, 1942, Serial No. 465,989
2 Claims. (01. 200—112)
1
2
The present invention relates to relays in which
of the pan, to provide three-point bearing against
one or more mercury switches are oscillated to
a wall to which the base may be fastened with its
open side toward the wall. A pair of horizon
tal arms 3 are ?xed to opposite sides of the base
make and break circuits, upon the energization
and de-energization of an operating electric mag
net. Any conventional electromagnet, if power
ful enough to do its work at all, tends to act
suddenly. Consequently, such an electromagnet
and project forwardly therefrom. Between these
arms or brackets is mounted a cradle that is
adapted to rock about a horizontal aXis parallel
serving as an actuator for an oscillatory mer
with the front face of the base in opposite direc
cury switch, produces a correspondingly rapid
tions from a horizontal plane. The cradle may
swinging movement of the switch; the result be 10 conveniently be formed of a ?at piece of sheet
metal that is square or retcangular and is pro
ing that the mercury is caused to oscillate rela
tively to its container and thus repeatedly open
vided at its four edges with ?anges or wings;
and close the circuit which it was intended either
those at the sides being indicated at 5 and those
at the front and rear at 6 and l. The side ?anges
to open or to close.
The primary object of the present invention is 15. and the rear ?ange are bent upwardly whereas
the front flange is bent downwardly. A little
to produce a simple and novel construction which
trunnion 8 projects outwardly from each of the
will overcome the fault just mentioned and insure
side ?anges and through an opening in the adja
that a circuit will be opened or closed positively
upon the operation of an oscillatory mercury
cent supporting bracket or arm 3. Fastened to
switch.
20 the bottom of the cradle, toward opposite sides,
My invention has for a further object to sim
are a pair of stiff arms 9. Another stiff arm H3,
'plify the construction of mercury switch relays
lying flat against the under side of the cradle, is
fastened thereto and projects rearwardly through
and make them sturdy and durable as well as
effective and efficient in operation.
a window H in the front wall of the base. The
A further object of the present invention is to
rear end of the arm or stem Ill may be bent up
provide simple and novel means for holding cap
wardly, within the base, as indicated at l2}.
sule-like mercury switches in a relay structure - Resting loosely on the part I2 is a fairly massive
or the like, so that they may be easily removed
weight 24 held in the pan by a pair of vertical
and replaced and be adapted to be turned end for
guides l5 which leave the weight freedom of up
end and be accurately located and securely held . and down movements.
Projecting forwardly from the longitudinal
when inserted in the relay structure.
The various features of novelty whereby my
center of the base, below the cradle, is a heavy
bar or plunger I6 of magnetic material; connec
invention is characterized will hereinafter be
pointed out with particularity in the claims; but.
for a full understanding of my invention and of
its objects and advantages, reference may be had
to the following detailed description taken in
tion with the base being a hinge that permits
t, swinging movements in a vertical plane, pref
erably through a limited angle only. In the ar
rangements shown, the front wall of the base is
provided with a hole through which the short
flange of an L-shaped plate I‘! projects; the
wherein:
Figure 1 is a top plan view of a relay embody 49 long ?ange or arm of the plate lying against
and being welded to the rear side of this wall.
ing the present invention; Fig. 2 is a section on
line 2—2 of Fig. l, the counter-balancing weight
The rear end of the member !6 is slotted to re
ceive the forwardly projecting ?ange and is se
being shown in elevation; Fig. 3 is a front view
of the device, a fragment of the retaining plate
cured to the latter by a hinge pin l8. It will be
for the switches being broken away; Fig. 4 is a ;, seen that the rear end of the member l6 extends
quite close to the long arm of the supporting
rear view of the device; Fig. 5 is a section through
the cradle and one of the switches at the longi
plate I‘! which, therefore, serves as a stop to lim
it swinging movements in both directions.
tudinal axis of the switch; and Fig. 6 is a sec
Cooperating with the member IE is a massive
tion on line B—6 of Fig. 2, showing only a frag- I
electromagnet l9 surrounded by a heavy iron
ment of the cradle and one of the switches.
shell 20. The electromagnet has a central bore
Referring to the drawing, I represents a base
in which the member i6 is a good sliding ?t,
which is conveniently in the form of a shallow.
this member forming an armature or plunger
sheet metal, rectangular pan. Within the pan
device for the electromagnet. There is the
are three feet 2 distributed in the form of a
triangle and somewhat longer than the depth # ‘usual plug 2| of electromagnetic material ?xed
connection with the accompanying drawing,
2,405,923
4
3
ible cords 33, containing the conductors that are
in the forward end of the bore in the electro
magnet, and this plug may be caused to strike
against the forward end of the plunger member
to limit the rearward travel of the electromag
connected to the switches, are carried from one
side of the rod 3i and underneath the same to
the switch terminals, so as to insure against
the creation of sharp bends in the cords when
net and thus serve as the actual stop for this
the cradle is rocked.
purpose. The electromagnet is connected to the
When a mercury switch is rocked suddenly
arms 9 by means of short pins or trunnions 22
from one position to another, there is a surging
fixed to the shell of the electromagnet and ex
of the mercury back and forth before a stable
tending through holes in the lower ends of the
arms. Consequently when the electromagnet is 10 condition is reached. By my improved con
struction, I prevent this sudden shifting of the
energized and moved toward the base it rocks the
switches which the powerful electromagnets tend
cradle and lifts the weight M. Then, upon de
to cause. This improved action results from
energizing the electromagnet, the weight M re
the inertia of the masses that must be moved.
stores the parts to the positions illustrated in
Fig. 2.
15
The cradle serves to support any desired num
ber of mercury switches of the type that are
adapted to open and close by means of such
rocking movements as can be provided by the
cradle. To this end the cradle is equipped with
holders for as many switches as are needed.
In
order to permit all of the switches to be simul
Part of the inertia is provided by the weight it,
which I use in lieu of the usual springs, but the
greater part is afforded by the electromagnet
itself which is purposely made massive.
As a
result of this construction, the elect-romagnet
starts slowly when energized and, when deener
gized, likewise aids in producing a slowly start
ing return movement. '
I have also found that the position of the rock
taneously opened or closed or to permit some of
ing
relative to the body of mercury, affects
them to open at the time that others are clos
ing, I so construct the holders that any switch 25 the tendency to surge on the part of the mer
cury and that the least amount of surging oc
may be turned end for end so that the same
curs when this axis is in the vicinity of the cen
rocking movement of the cradle may serve both
ter of gravity of the movable body of mercury.
to open and to close the same switch, depending
In the particular switch illustrated, the inner
upon which end is forward
which end is
toward the rear.
30 shell as of the capsule is metal and forms one
electrode, while the other electrode 35 is a but
The switches illustrated are of the capsule
ton or disk at the longitudinal center of the
type indicated as a whole at 2'5, one end of each
switch within the large end of the capsule and
nearer to the inner end than to the outer end of
shaped clips 25, of resilient sheet metal, secured 35 the enlarged part of the capsule. It will be seen
that the axis of the trunnions 8 of the cradle,
in alignment with each other, one behind and
upon which it rocks, is about midway between
one in front of the axis about which the cradle
the ends of the capsule and intersects the longi
rocks. Each clip is secured to the cradle by two
rivets 25 along the longitudinal center line; the
tudinal axis of the latter. Therefore, in this
heads of the rivets projecting up into the clips 40 particular form of switch, the shifting body 323
of mercury lies wholly on one side of the rock- I
to form bearings which are engaged by the un
ing axis of the cradle when the switch is open
der side of the large end of a capsule as shown
as in
5; and when the switch is rocked in
in “'g. 5. Each clip has in one of the sides ad
jacent to the top, and midway between the ends,
the counter~clockwise direction, so ‘as to bring
a rounded inward projection 2'5 that bears upon 45 the mercury into the other end of the switch, the
center of gravity of the movable body of mer
the large end of the capsule, somewhere in the
cury is approximately at the axis about which
upper half of the latter. By this means the
large end of the capsule is provided with a three
the oracle rocks. It is immaterial whether the
switch is positioned in the cradle as in Fig. 5 or
point hearing which accurately aligns it. Al
though the small end of the capsule extends
is turned end for end, because the cradle rocks
through equal angles above and below a horizon
through a clip, it has no bearing in the same
as long as it is properly held by its large end.
tal position; and, as a result, if the switch in
Upon turning a switch end for end the clip
Fig, 5 were turned end for end, the movable body
of mercury would be in the same position with
which was previously idle becomes the active
respect to the rocking axis, when the switch is
one.
closed, as it is with the disposition of parts il
It will be seen that the cradle is so propor
lustrated in Fig. 5. The limits of the rocking
tioned that the rear ends of the switches may
movements are always the same, the rocking
engage with the rear ?ange 'a', while the front
ends may be engaged by a retaining plate 28 lying
movement in one direction always ceasing when
flat against and secured to the ?ange 5 at the
the armor tail piece it strikes the edge of the bot
front end of the cradle. The plate 28 may con
tom of the window ii, whereas the cradle can
veniently be held in place by screws 23 extending
swing in the opposite direction only until the
through vertically elongated slots 33 into the
plug 25 strikes the end of the plunger l6.
It will thus be seen that I have produced a
flange 5. Theslots are made long enough so
that, upon loosening the screws, the retaining
simple
novel mercury switch electromag
plate may be dropped down clear of the switches,
netic relay to insure that a circuit once closed,v
without completely detaching the plate from the
remains closed until the relay is operated for
cradle.
the purpose of closing the same, thereby pre
venting chattering or repeated opening and clos
The side walls or ?anges of the cradle are
carried a considerable distance above the tops
ing of a switch due to undesirable movements of
of the switches so as to provide room above the
the mercury; that switches may easily be re
switches for a rod til extending transversely
moved
replaced; and that any switch in a
across the cradle and supported at its ends by
group thereof may easily be turned end for end
these sides or ?anges. The rod is preferably
to cause it to close when the others open.
sheathed with insulating material 32. The flex
While I have illustrated and described with
capsule or casing being smaller in diameter than
the other end. Each holder consists of two U
5
2,405,923
particularity only a single preferred form of my
invention, I do not desire to be limited to the
exact structural details thus illustrated and de
scribed; but intend to cover all forms and ar
rangements which come within the de?nitions of
terial hinged at one end to the base and ex‘
tending at the other end into the solenoid tov
cause the solenoid to be drawn toward the base
and the cradle to be rocked in the direction op
posite to the aforesaid direction when the sole
noid is energized, the hinge axes of the solenoid
I claim:
and core being so disposed that the solenoid and
1. In an electromagnetic switch device, an up
core remain coaxial during shifting movements
right base, a cradle for a mercury switch mount
of the solenoid along the core.
ed on the front side of the base for rocking 10
2. A device as set forth in claim 1, wherein
movements above a horizontal axis parallel to
the hinge axis of the solenoid is parallel to the
the base, a weight cooperating with the cradle to
‘axis about which the cradle rocks and passes
swing it in one direction, a solenoid below and
through the center of gravity of the solenoid.
hinged to the cradle, and a core of magnetic ma
EARLE G. HENRY.
my invention constituting the appended claims.
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