Device for Controlling Electric Current. Page: 3 of 3
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1,292,730
point 22 into contact with the tongue 23.
The numeral 30 refers to the magneto which
is driven by the engine shaft 2. This mag-
neto is grounded at the point 31 and from it
5 leads the electrical current conducting wire
32 which separates, one branch, 32'., being
connected to the tongue 23, and the other
branch 32" being connected to the variable
reactance coil 17. This coil is also con-
10 nected to the tongue 21 through the electri-
cal current conductor 33. The tongue 21 is
also connected, in multiple, with the lights
through the electrical current conductor 34
which is grounded at the point 35.
15 At slow motor speed, the tongues 21 and
23 are in contact through the contact point
22 and the current passes from the magneto
through the conductors 32, 32', the tongues
23 and 21 and through the lights, through
20 the conductor 34, and is grounded at the
point 35, thus following the path of least re-
sistance and practically full voltage is thus
given to the lights. As the speed of the mo-
tor increases, the ring 11 approaches a plane
25 at right angles to the shaft 6 carrying the
disk 13 out of contact with the pin 20 and
the flexibility of the free end of the tongue
21 carries the point 22 out of contact with
the tongue 23 and the electrical current is
3o sent from the electrical current conductor
32 through the conductor 32" and through
the coil 17 and thence through the electrical
conductors 33 and 34 through the lights.
The electrical current is thus impeded by
35 said coil, preventing too strong a current
from passing through the lights and burn-
ing them out. As the speed of the motor in-
creases, this impedance is increased by reason
of the fact that the plug 14 is moved farther
40 and farther into the lining 15, thus increas-
ing the magnetic resistance and setting up a
counter electro-motive force. The arms 16,
16, form, with the frame 4, the ordinary
horse shoe magnet and the farther the plug
45 14 moves into the lining 15 the greater themagnetic flux and, consequently the greater
the electrical impedance so that the electri-
cal impedance is increased in proportion as
the motor speed increases and as the volt-
age created by the magneto increases, and 50
vice versa.
What we claim is:
A device of the character described in-
cluding a motor, an electrical current gen-
erator driven thereby, a supporting member, 55
an electrical current conductor connected
with the generator and formed into a va-
riable reactance coil supported by said mem-
ber, a movable contact point connected to
said conductor, a fixed contact point oppos- 60
ing said movable contact point, said fixed
point also being connected to said electrical
conductor, a rotatable shaft driven by the
motor, a sleeve mounted thereon, a member
actuated by the sleeve and normally operat- 65
ing against and holding the movable con-
tact point in contact with the fixed contact
point, thereby short circuiting the variable
reactance coil, a yieldable member, operat-
ing against the sleeve to hold said points in 70
contact, and a mechanism operated. by the
shaft and operatively connected with the
sleeve whereby the position of said sleeve is
varied, relative to the variable reactance coil,
as the speed of the motor varies, said mecha- 7$
nism operating when the shaft has reached a
predetermined speed of rotation, to overcome
said yieldable member and release said yield-
able contact point to permit the separation
of said points, thereby cutting said react- 80
ance coil into said current conductor.
In, testimony whereof we have signed our
names to this specification in the presence of'
two subscribing witnesses.
EARLE H. DUKE.
JAMES D. BROWN.
Witnesses:
E. V. HARDWAY,
F. A. LIDDELL..1
2
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Duke, Earle H. & Brown, James D. Device for Controlling Electric Current., patent, January 28, 1919; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1257150/m1/3/: accessed July 1, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.