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Патент USA US2127259

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Patented Aug. 16, 1938
Martin A. Johnson, San Marino, Calif.
Application January 24, 1934, Serial No. 708,095
2 Claims.
My invention relates to mechanism especially
adapted for controlling the contact points of an
electric circuit in a signal system through the
action of a power operated disc or wheel, in con
junction with an electro-magnet arranged in a
separately controlled electric circuit; the present
application covering subject matter divided out of
my pending application Serial Number 682,251,
filed July 26, 1933.
The purposes and advantages of my invention
will be readily comprehended from the following
detail description of the drawing, wherein:
Figure 1 is a diagrammatic view in elevation of
my improved mechanism.
Figure 2 is a detail view in side elevation of
the driven wheel of the mechanism, showing the
side opposite to that disclosed in Figure 1.
The specific embodiment of the invention, as
illustrated, involves a power driven disc or wheel
20 I0 adapted to rotate in a given direction either
through the medium of its shaft I l or in any suit
able manner.
I2’ represents a suitable armature
arranged in an electric circuit, the leads whereof
are shown at I3, and pivotally mounted at I4 is
25 an armature I5 adapted to be attracted by the
electro-magnet I 2 when the latter is energized.
The armature I5 is provided with a pair of con
tact springs I6 and I7 which normally are spaced
apart or arranged in open position; the contact
springs I6 and I'I are both provided with contact
points I8 and I9, respectively, the contact springs
being arranged in the electric circuit to be con
trolled, a portion of the lead line whereof is
shown at 20 connected to spring I6; while the
contact spring I‘I is grounded as shown at 2 I.
The end of the pivoted armature I5 has a
knurled wheel 22 journaled thereon so as to be
free to rotate when the latter is brought into con
tact with the power operated disc or wheel I0.
One side of the knurled wheel 22 is provided with
a coil spring 23, one end whereof is iixedly secured
to the axle or spindle oi wheel 22; (the spring be~
ing coiled thereabout) while the other end of the
spring is ñxedly secured to the armature I5; the
normal tendency of the spring being to rotate
wheel 22 back to normal position when the latter
is free of the power driven disc or wheel I0.
Secured to the spindle or aXle of Wheel 22 are
a pair of ñngers 24 and 25; the lingers being
30 adapted to rotate with the spindle or axle to
which wheel 22 is ñxedly secured. Finger 24 is
adapted to engage contact spring I‘ö and force its
contact point I8 into contact with point I 9 on
spring I'I; the latter spring being preferably of a
I5 stiff type so as not to flex and to constitute a
(Cl. 200-8’7)
stop for finger 25 when the wheel 22 is returned
to normal position through the action of its coil
spring 23.
It is assumed that power operated wheel I0
is rotating in clockwise direction and that the 5
circuit of electro-magnet I2 has been closed thus
energizing the electro-magnet.
Energizing the
electro-magnet causes the armature I5 to be at
tracted toward the magnet and hence swing the
free end of the armature toward the right in 10
Figure l thereby bringing the knurled wheel or
disc 22 into operative relation with the disc or
Wheel Ill, with the result that knurled wheel 22
will be rotated in counter-clockwise direction in
Figure 1. Such counter-clockwise rotation of 15
Wheel 22 will cause the ñnger 24 to swing to the
left in Figure 1 and be brought into contact
with contact spring I6 thereby closing a circuit
which involves lead line 20.
As soon as the electric circuit of lead lines I3 20
and hence of electro-magnet I2 has been dis
rupted, it causes deenergization of magnet I2,
allowing the armature I5 to swing back to normal
position, moving wheel 22 out of contact with the
power-driven wheel I0.
As soon as wheel 22 has 25
been moved out of contact with wheel I0, the
spring 23, which controls the spindle of wheel 22,
will rotate the spindle and Wheel 22 back to nor
mal position, namely in clockwise direction ln
Figure 1, until ñnger 25 is brought into contact 30
I1 as soon as finger 24 releases its
pressure thereon. As a result the circuit con- 35
trolled by springs IG-Iï will be disrupted or
What I claim is:
l. In electric circuit control mechanism of the
character described, a power operated Wheel; an 40
points; a wheel rotatably mounted on said arma- 45
moved into operative
engagement with the power operated wheel when
the armature is attracted by said electromagnet;
means carried by the second mentioned wheel
adapted to move said Contact points into engage- 50
ment with each other; and means whereby said
second mentioned wheel and said first mentioned
means are returned to normal position when said
electromagnet is deenergized and the armature
swings back to normal position.
2` In electric circuit control mechanism of the
character described, a power operated wheel; an
electromagnet; a swingingly mounted gravity con
trolled armature provided with a pair of nor
mally spaced circuit controlling contact points;
a wheel rotatably mounted on the armature and
adapted to be moved into operative engagement
with the power operated wheel when the armature
is attracted by said electromagnet; a pair of
10 fingers adjustably secured to the spindle of the
second mentioned wheel, one of said fingers being
adapted to move the contact points into engage
ment with each other when said wheel is rotated
While the other ñnger constitutes a stop for said
second mentioned wheel in its reverse rotation;
and a coil spring whereby said second mentioned
wheel is rotated to normal position when the elec
tromagnet is deenergized and said armature
swings back to its normal position.
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