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Патент USA US2412092

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Dec. 3, 1946.;
,
L. F, MAYLE-
2,412,092
ELECTRONIC TIMER
Filed April 9, 1945
Fl(5.2v
—‘> TIME
lNVENTOR
F. MAYLE
A
01.0 “1
‘erovide all
. hereby em
'1 enema?
6
“(N/“Q51 electronic timin
duration of an inte rmittently
transformer is prel
resiste?" ‘
a
se shifting network.
i‘g'ization of a 1024i cir
ne
tial with respect ‘to gle cathode "c0 lender ‘the
tube n0n~conducting duriiw idle p
Sum as a Welding‘ ‘transformer for a time
apparatus,
especizive of she p0 tential 0f the
81y equal ‘to ‘?ne time 01 one complete cycle 55 centrol gnd. T‘
1'
of me
35 is
%,41%,092
.
5
represented by the curve 30 of Fig. 2 has a nega
tive value illustrated by the point 38 and the
to disconnect said load circuit from said source of
alternating current, respective electronic gas
alternating current ‘represented by the curve 3! '
?lled control devices to control the contact opera
reaches its next nodal point represented at 39,
tions or" said relays, and means including a circuit
the breakcontact 25 of relay 22 opens the cir U! connectedto said alternating current source to
cuit to the primary winding of the welding trans
trigger said electronic devices successively at pre
former 26. Again, it is seen that the contact
determined corresponding points of di?'erent
operation coincides with a no-current instant in
cycles of said alternating current, whereby to
the welding transformer primary winding circuit.
effect energization of said load circuit.
Thus, the contact points are not subject to de 10 , 3. Apparatus for controlling the energization of
terioration by arcing and the welding transformer
a load circuit comprising, a source of alternating
current, a circuit closing relay having an oper
is energized for the length of time corresponding
precisely to the duration of one complete alter~
hating current cycle.
The respective relay contacts
and
ating winding and maize contacts operable to
connect said load circuit to said source of alter
wil
hating current, a circuit opening relay having
remain in the last described positions until i
switch is is opened.
- operating winding and breal: contacts opera?
to disconnect said load circuit from said so
Qbviously between the one .
ing or the contact
and
op ning of t is
switch
the welding transiori'nu'
is not encr
gized again. The opening of the switch
of
course, is random in time with ‘respect to the
alternating current, respective electronic ;
?lled. control devices to control the er
alternating current. However, since the charac
teristics of the relays
and
'"
of said relay windings, and a coupling
connected to said alternating current source b-G
trigger said electronic ‘devices successively at pre
determined corresponding points of two successive
cycles of said alternating current, whereby to
are made iden~
tical, the release of these contacts following the
opening of the switch it is concurrent. Thus,
the circuit to the primary winding of the weld
ing transformer is maintained in a deenergized
state.
While it will be understood that the circuit
speci?cations of the electronic timer may vary
according to the design for any particular appli
cation, the following circuit speci?cations for a
timer employed for spot welding apparatus are
included by way of example only as iollows:
effect energization of said load circuit for one
complete alternating current cycle.
4. Apparatus for controlling the energization
_ of a load circuit comprising, a source of alter
hating current, a circuit closing relay having an
operating winding and make contacts operable to
connect said load circuit to said source or" alter
hating current, a circuit opening relay having an
operating winding and break contacts operable
to disconnect said load circuit from said source
A. C. source lit-J30 volts
of alternating current, an electronic gas-?lled
Transformer ll—Prirnary, 230 volts; secondary,
control device for each of said relays, each device
having an. input circuit and an output circuit,
the output circuits of said electronic devices
60 volts with center tap
Condenser l2—l inicrofarad
Resistor l3--10,00ll ohms
Condenser ill-0.1 microiarad
Tubes l5 and iii-205i
Resistor l'l-—560,000 ohms
Resistor l8—56,000 ohms
Tubes 2i and 24-1-1’
40
being connected respectively to the windings of
said relays, the winding of said circuit closing
relay being connected permanently to said alter
nating current source and the ‘winding of said
circuit opening relay normally being discon
While there has been described what, at pres
ent, is considered the preferred embodiment of
the invention, it will be obvious to those skilled
in the art that various changes‘and modi?cations
may be made therein without departing from the ‘I
invention, and, therefore, it is aimed in the ap
pended claims to cover all such changes and mod
i?cations as fall within the true spirit and scope
of the invention.
What is claimed is:
1. Apparatus for controlling the energization
nected from but adapted to be connected to said
alternating current source by the contacts of said
circuit closing relay, and a coupling circuit con
nected between said alternating current source
and the input circuits of said electronic devices
to trigger said devices successively at predeter
mined corresponding points of two successive
cycles of said alternating current, whereby to
effect energization of said load circuit for one
complete alternating current cycle. ,
5. An electronic timer for controlling the en
ergization of a. load circuit comprising, a source
of a load circuit comprising, a source of alternat
of alternating current, a. circuit closing relay
having contacts operable to connect said load
ing current, a circuit closing relay having con
tacts operable to connect said load circuit to said
‘circuit to said source of alternating current, a
circuit opening relay having contacts operable to
source of alternating current, a circuit opening 60 disconnect said load circuit from said source of‘
relay having contacts operable to disconnect said
load circuit from said source of alternating cur
rent, and means including electronic timing ap
paratus coupled to said source of alternating cur- ‘
rent to effect successive operations of said respec
alternating current, two electronic control devices
each having an output circuit, means including
one of said output circuits to energize said cir
cuit closing relay, means including the other of
said output circuits and the contacts of said cur
tive relay contacts at predetermined correspond
ing points of different cycles of said alternating
current, whereby to effect energization of said
rent closing relay to energize said circuit opening
relay, the contacts of said relays requiring identi
cal operating times following the energization of
load circuit.
the respective relays, and means connected to said
alternating current source to operate said elec
tronic devices su?iciently in advance of the actu~
ation of said relay contacts to cause said contact
'
>
2. Apparatus for controlling the energization
of a load circuit comprising, a source of alter
nating current, a circuit closing relay having
make contacts operable to connect said load cir
cuit to said source of alternating current, a cir
cuit opening relay having break contacts operable
- actuations coincidentally with the occurrence of
predetermined points of said alternating current.
6. An electronic timer for controlling the error-‘1
asiaoaa
‘i
@
gization of a load circuit comprising, a source of
alternating current, a circuit closing relay having
succesive nodal points of said alternating current
equal to the actuating times of said relay'con
an operating winding and contacts operable to
connect said load circuit to said source of alter
tacts, whereby to cause said contact actuations
coincidentally with the occurrence of said nodal
hating current, a circuit opening relay having an
operating winding and contacts operable to dis
points.
connect said load circuit from said source of
8. An electronic timer for controlling the ener
gization of a load circuit comprising, a source of
alternating current, two electronic control devices
alternating current, a circuit closing relay having
having input circuits connected for simultaneous an operating winding and make contacts operable
control and individual output circuits, the wind 10 to connect said load circuit to said source of alters
ing of said circuit closing relay being energizable
under the control oi’ the output circuit of one of
said electronic devices and the Winding of said
circuit opening relay being energizable under the
control of the output circuit of the other or‘ said
electronic devices and the contacts of said circuit
closing relay, the contacts of said relays requir
ing identical actuating times following the enere
nating current, a circuit opening relay having an
operating winding and break contacts operable to
disconnect said load circuit from said alternating
current source, two electronic control devices
having input circuits connected for simultaneous
control and output circuits connected respectively
to the windings of said-relays, the winding of said
circuit closing relay being directly connected to
said alternating current source and the winding
gization of the respective windings, and means
connected between said source of alternating cur 20 of said circuit opening relay being normally dis
rent and said input circuits to operate said elec
connected from but adapted to be connected to
tronic devices at times prior to the occurrence of
said alternating current source by the contacts of
nodal points of said alternating currentequal to
said circuit closing relay, the contacts of said re
the actuating times of said relay contacts, where
lays requiring identical operating times following
by to cause said contact actuations coincidentally 25 the energization of the respective windings, a
with the occurrence of said nodal points. _
coupling circuit between said alternating current
'7. An electronic timer for controlling the ener
source and the input circuits of said electronic
gization of a load circuit comprising, a source of
devices to eiiect operation of said devices, and a
alternating current, a circuit closing relay having
phase-shifting network included in said coupling
an operating winding and make contacts operable 30 circuit to operate said electronic devices su?i
to connect said load circuit to said source of alter
ciently in advance of the operation of said relay
nating current, a circuit opening relay having an
‘contacts to e?ect said contact operations coin
operating winding and break contacts operable to
cidentally with the occurrence of nodal points of
disconnect said load circuit from said source of
the alternating current applied thereto.
alternating current, two electronic control devices‘
9. Timing apparatus comprising, a source of
having input circuits connected for simultaneous
alternating current, a circuit closing relay having
control and output circuits connected respectively
normally open contacts operable to establish a
to the windings of said relays, the winding of said.
connection to said source, a circuit opening relay
circuitclosing relay being directly connected to
having normally closed contacts connected in
said alternating current source and the winding 40 series with said normally open contacts and op
of said circuit opening relay being normally dis~
erable to disestablish a connection to said source,
‘connected from but adapted to be connected to
and means including electronic apparatus having
said alternating current source by the contacts of
input circuit electrodes coupled directly 'to said
said circuit closing relay, the contacts or‘ said re
source and output circuit electrodes coupled to
lays requiring identical actuating times following 45 said source through said relays to effect succes
the energization of the respective windings, and
sive operations of said respective relays at prede
means including a phase-shifting network con
termined corresponding points of di?’erent cycles
nected between said source of alternating current
of said alternating current.
and said input circuits to operate said electronic
LOUIS F. MAYLE.
devices at times prior to the occurrence of two 50
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