close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2120787

код для вставки
June 14, 1938.
G. LOWKRANTZ'
2,120,787
TIME DELAY DEVICE
Filed Dec. 1, 1936
6
f
L
50
g
7
o
7
-
Z7
F\
20K
9'
3/
4
'
11
0
2o
25
l2 /6
.
l5
k“24
23
22
l9
8 /0 /7
/3
K2!
/8
“
/4
‘f
INVENTOR.
m
BY
' A TTORNEY
Patented June 14, 1938
2,120,787
UNITED STATES PATENT OFFICE
2,120,787
TIME DELAY DEVICE
Gunne Lowkrantz, Endicott, N. Y., assignor to
International Business Machines Corporation,
New York, N. Y., a corporation of New York
Application December 1, 1936, Serial No. 113,620
9 Claims.
This invention relates to time delay mecha
nisms and more particularly to mechanisms
adapted to delay the applicationof a connected
load to a supply circuit whereby the supply cir
cuit may be conditioned properly during the
5
delayed time interval and then automatically
connected to the applied load.
A speci?c application of the present invention
is in connection with various electric discharge
10 devices such as thermionic tubes.
In order to
secure long tube life it is desirable to delay the
application of any load thereto until suf?cient
time has elapsed for the cathodes to become com
pletely heated after the supply source has been
1 OK connected thereto.
An object of the present invention is to pro
Vide means whereby the load circuit is connected
to the supply source or circuit after a prede
termined timed interval has elapsed after the
20 controlling element has been operated.
Another object of the invention is the provi
sion of means whereby the time delay mechanism
becomes effective if any interruption in the sup
ply power occurs during the initial said prede
termined timed interval or at any time there
after.
Various other objects and advantages of the
invention will be obvious from the following par
ticular description of one form of mechanism
30 embodying the invention or from an inspection
of the accompanying drawing; and the invention
also constitutes certain new and useful features
of construction and combination of parts here
inafter set forth and claimed.
In the accompanying drawing, a circuit dia
35 gram
is shown of the invention showing dia
grammatically the control elements thereof.
Referring to the drawing, a full wave recti
her I is shown representing one type of power
40 supply unit, the anodes of which are connected
in the usual manner to the terminals of the
secondary winding 2 of transformer 3, the center
tap of said winding connected to one side of the
_ coil of clutch magnet 4 and the other side of
which is connected to one terminal or side of the
secondary winding. The cathode potential is
supplied by the additional secondary winding 5,
the center tap of which is connected to the
power supply conductor 6 and any desired load 1.
Any suitable means to rotate shaft 8 may be
provided such as motor 9 to rotate continuously
the said shaft, upon. which a clutch member ID
is slidably keyed or secured and adapted by means
of the pivoted extension of armature II to be
55 positioned to engage a clutch member I2 which
50
(Cl. 250-27)
is attached to or may be an integral part of the
cam 13 which are rotatably mounted on shaft
8. A support member I4 is shown for shaft 8
and upon which is attached a stop ?nger l5 to
engage a stop IS on the cam so as to prevent 5
the cam to be returned farther by spring ll
when the clutch members are disengaged. Co
operating with cam I3 is a cam follower I8
mounted on the arm 19 which is an extension of
spring blade 20. The multi-contact switch 2| 10
comprises a plurality of normally open contacts
22, 23, and 24 and a normally closed contact 25.
The contacts are so adjusted that as the cam. I3
is rotated and due to its con?guration actuates
the spring blade to the right, the contacts are 15
adapted to be operated in the following order;
?rst contact 22 closes followed in succession by
the vclosure of contacts 23 and then contacts 24;
?nally, when the said contacts are closed, con
tacts 25 are opened.
The operation of the mechanism is as follows:
Upon closure of the main switch the secondary
Winding 2 and 5 of transformer 3 are energized.
The clutch magnet 4 connected directly to wind
ing 2 is energized to attract its armature l l caus 25
ing the clutch members It and IE to be engaged.
Through the normally ‘closed contacts 25, con
ductor 21, speed control resistor 28, or like device,
the motor 9 is energized rotating shaft 8 and the
cam 18 through clutch members It and i2 which
are now engaged. The tube cathode starts to
heat at the same time the clutch magnet and
motor are energized. It will be noted at this
time that the load 1 is disconnected from the out
put of the tube 1 by means of the normally open
contacts 22, .23, and 24.
The cathode continues
to be energized and heated for a predetermined
time interval equivalent to the time necessary for
the cathode to attain its proper operating tem- ._
perature before the high section or lobe of the
cam 13 approaches the cam roller or follower I8.
As the cam is rotated at a predetermined rate
and in accordance with the elapsed time required,
the spring blade 2|] will gradually be positioned
so that contacts 22 are closed. By this time the
cathode is completely heated and the tube passes
current which ?ows from the cathode through
?lter condenser 30, resistor 3|, and contacts 22
to the center tap of winding 2.
The said resistor limits the initial charging
current of the condenser and as the condenser
is gradually charged to nearly full voltage, the
spring blade 20 is positioned to close contacts 23
which causes the resistance 3| to be shunted
from the described circuit and thereby the con
2
2,120,787
denser 30 is connected directly across the recti
iier output to be fully charged. Finally, con
rotation of said cam element thereby maintain
ing the said contacts operated.
tacts 24 are closed to connect the external load
4. The invention set forth in claim 3 pro
vided with means to return the cam element to
1 directly to the center tap of winding 2 thereby
connecting the load directly to the power supply
therefor. After connecting the load to the recti
?er tube the normally closed contacts 25 in the
motor circuit are opened to cause the motor to be
deenergized. The cam i3 remains in its ?nal
10 position to maintain the said contacts in an
operated position so long as the clutch magnet
4 remains energized so that the clutch members
I0 and I 2 remain engaged. If, however, there
is an interruption in the supply voltage at any
15 time, due to power failure or opening of the
switch 26, etc., the clutch magnet 4 is deenergized
to release its armature and disengage the said
clutch members, whereupon the spring I’! will
return the cam. 53 to the normal starting position
20 and is prevented from being returned to any
other position by means of stops it and i5. In
this manner, the ‘cathode will always have sul?
cient time to regain the proper operating tem
perature before the load is again applied to the
25 tube.
While there has been shown and described and
pointed out the fundamental novel features of
the invention as applied to a single modi?cation,
it will be understood that various omissions and
30 substitutions and changes in the form and details
of the device illustrated and in its operation may
be made by those skilled in the art without de
parting from the spirit of the invention.
It is
the intention therefore to be limited only as indi
35 cated by the scope of the following claims.
What is claimed is as follows:
1. A device of the character described com
prising, in combination, a thermionic tube com
prising cathode and anode elements and circuits
40 therefor, means to energize the cathode circuit,
a load circuit, control means comprising cam
operated contacts, and means to operate said
contacts after energization of the said cathode
circuit for a predetermined timed interval there
45 by connecting the said load circuit to the anode
circuit.
2. A device of the character described com
prising, in combination, a. thermionic tube com
prising cathode and anode elements and circuits
50 therefor, a supply source to energize the said
circuits, a load circuit, control means comprising
cam operated contacts, means to operate said
contacts after energization of the said cathode
circuit for a predetermined timed interval there
55 by connecting the said load circuit to the anode
circuit, and means to maintain the said con
tacts operated during the time the supply source
is effective to energize the said circuits.
3. A device of the character described com
60 prising, in combination, a cam element and sup
porting means therefor, means to rotate the
supporting means continuously, means to con
nect the cam element and the said supporting
means thereby rotating the cam element from
65 a normal starting position, contacts: operated by
said cam element, and means to prevent further
the normal starting position.
5. A device of the character described com
prising, in combination, a thermionic tube com—
prising cathode and anode elements and circuits
therefor, a supply source to energize the said
circuits, a load circuit, a cam and rotating means 10
therefor, control means energized by said supply
source to operate the cam rotating means, con
tacts cooperating with said cam and operated a
predetermined timed interval after energization
of the said control means to connect the load
circuit to the anode circuit, and means to pre
vent further rotation of said cam thereby main
taining the said cam contacts operated.
6. A device of the character described com
prising, in combination, a thermionic tube com 20
prising cathode and anode elements and circuits
therefor, a supply source to energize the said
circuits, a load circuit, a cam normally positioned
in an initial starting position and rotating means
therefor, control means energized by said supply 25
source to operate the ca‘). rotating means, a
plurality of contacts cooperating with said cam
and operated a predetermined timed interval
after energization of the said control means to
connect the load circuit to the anode circuit, 30
means to prevent further rotation of said cam
thereby maintaining all the said cam operated
contacts in operative position, and means upon
discontinuance of the supply source and de
cnergization of said control means to return the .35
said cam to said initial starting position.
7. The invention set forth in claim 6 in which
the cam con?guration is such as to operate the
said contacts progressively.
8. A device of the character described com 40
prising, in combination, a rectifier tube compris
ing cathode and anode elements and circuits
therefor, a supply source to energize the said
circuits, a load circuit, control means, a 0011
denser, and means including time delay means
to operate the said control means a predeter
mined timed interval after energization of the
cathode circuit to ?rst connect the condenser
to said anode circuit and then connect the load
circuit to said anode circuit including the con
denser.
9. A device of the character described com
prising, in combination, a recti?er tube com
prising cathode and anode elements and cir
cuits therefor, a supply source to energize the
said circuits, a load circuit, control means, a
condenser and a charging resistor therefor, and
means including time delay means to operate
the said control means a predetermined timed
interval after energization of the cathode cir
cuit to connect ?rst the condenser and resistor
to the anode circuit, then shunting said resistor
from the anode circuit and then connecting the
load circuit to said anode circuit including the
condenser.
65
GUNNE LOWKRANTZ.
Документ
Категория
Без категории
Просмотров
0
Размер файла
323 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа