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Патент USA US2120609

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J‘u‘ne '14, 1938._
2,120,609
c. B. HORSLEY ET AL
X~RAY CONTROL MEANS
Filed March 11, 1937
00.00.0000!
FIG. 2
{ENVENT0R5
CAPERTON
HORSLEY
BY EDWIN R. GOLDFIELD
2,120,609
Patented June 14, 1938
UNITED STATES PATENT OFFICE
2,120,609
X-RAY CONTROL MEANS
Caperton B. Horsley, Gates Mills, and Edwin R.
Gold?eld, University Heights, Ohio, assignors
to Picker X-Ray Corporation Waite Manu
facturing Division, Inc., Cleveland, Ohio, a cor
poration' of Ohio
Application March 11, 1937, Serial No. 130,296
2 Claims. (Cl. 250—34)
This invention relates to means for controlling
the high tension circuit of an X-ray tube and the
controlling means contemplated by the inven
marked 0 to 9, the switch being shown as upon
the point (I which is a dead point. ‘The points I,
tion provides both compensation for variations in
line voltage, and means for selectively operating
the tube at any of the several kilovoltages which
the technique of the apparatus demands.
transformer IT, the points 2, 5 and 8 are connect
ed to the H5 transformer lead and the points 3,
6 and 9 to the I05 lead.
Supposing the leads of the transformer IT to
indicate relative turn units in the transformer
winding, and the L1 side of the line being con
nected to the transformer IT at the lead 50, it will
be apparent that when the switch A is on point
I, 4 or ‘I, the line will be effective across that
portion of the transformer IT between its leads
I25 and 50, which is '75 turn units. Similarly,
when the switch A is on point 2, 5 or 8, the line 15
will be effective between the leads H5 and 50, or
65 turn units, and when the switch is on point
3, 6 or 9, the line will be effective between the
leads I05 and 50, or 55 turn units.
As indicated in Fig. 1, one side of the primary 20
winding of the high tension tube transformer HT
Objects of the invention are to provide an ex
tremely compact arrangement for the purpose,
10 adapted for use in a portable control unit for the
tube served, and more particularly to provide but
a single handle by which the operator may make
both sets of adjustments, in an exceedingly sim
ple manner.
. 4 C31
The exact nature of this invention together
with further objects and advantages thereof will
be apparent from the following description taken
in connection with the accompanying drawing, in
which Fig. 1 is a diagrammatic view showing a
20 typical X-ray tube control circuit embodying the
invention; Fig. 2 is a face view of the high ten
sion circuit controller appearing in Fig. 1; and
Fig. 3 illustrates in typical longitudinal section, a
physical embodiment of the controller switch
25 means appearing in Fig. 1.
With reference now to the drawing, X is the
X-ray tube which is to be served by the alternat
ing current line L1, L2, the tube having for its
?lament control, a ?lament transformer PI‘ and
30 ?lament control FC, and for its high tension cir
cuit a high tension transformer HT, inverse volt
age suppressor S, and exposure switch E. An
input transformer IT is arranged to be effective
between the line L1, L2, and the parts described,
and a voltmeter V and milliammeter MA are ar
ranged in the circuit to serve the usual purposes.
What has thus far been described will be ap~
preciated by one familiar with the art as gener
ally typical of the latter, and it will be apparent
that the high tension circuit of the tube is con
trollable by control of the primary circuit of its
high tension transformer HT.
The input transformer IT is conveniently an
auto-transformer and a number of leads or taps
45 are provided for its windings, all as indicated in
Fig. 1 of the drawing, wherein the leads are indi
cated as a series from O to 135.
The line L1, L2, being nominally at 110 volts
but actually its voltage varying at times down to
50 say 105 and up to say 125 volts, we provide means
effective between the line and the input trans
former IT to adjust the transformer to the line.
As here shown such means comprises a switch A
connected on one side to the line L2 as by the
55 connection a and having a number of points
4 and ‘I are all connected to the I25 lead to the
is connected to one end of the input transformer
IT as by the line b in which are located the volt
age suppressor S and exposed switch E. The
opposite end of the high tension transformer pri
25
mary winding is connected to a switch B which
controls its relation to the transformer IT. The
switch B is preferably, according to our inven
tion, physically connected with the switch A to
move with the latter, but electrically insulated
therefrom, as indicated in Figs. 1 and 3. As to
the physical relation of the parts, the switches are
preferably arranged for coaxial movement as in
dicated in Figs. 1 and 3 so that a single handle
AB may be provided for coincident control of both
switches. In Fig. 3 the parts are shown as with
the switch A on its point 2, the point ‘I lying there
opposite, and the switch B aligned with the
switch A.
The switch B is provided with three segmental
points including a point I23 so located that the
switch B will be on this point when the switch A
is on any of its points I, 2 or 3, a second point
456 so located that it will be on this point when
the switch A is on any of the points 4, 5 or 6, and l :1
a third point ‘I89 so located that it will be on this
point when the switch A is on any of its points ‘I,
8 or 9. The point I23 is connected to the 80 lead
of the transformer IT, the point 456 to the I02
lead and the point ‘I89 to the I35 or high end lead 50
of the transformer.
It will be apparent then that when the switch
B is on its point I23, the high tension trans
former HT will be served by 80‘ turn units of the
transformer IT, when the switch B is on its point 55
2
2,120,609
456, 102 turn units of the transformer IT will
be available, and when the switch B is on its
point 189, the entire transformer IT with its
135 turn units will be available. Obviously, there
fore, the three points of the switch 13 selectively
provide for the high tension circuit of the tube,
three different operating conditions for the tube,
such that the tube may operate at any of three
kilovolt ratings selected by the operator in the
usual manner according, for example, to the sec
tions encountered in radiographic practice.
The face of the apparatus may be calibrated
as indicated in Fig. 2, showing 10 points for the
switch AB which, as here illustrated, is on its 0
point or “off” position. Corresponding to the
points of the switch B, the face shows three ranges
designated as “Low”, “Medium” and “High”. For
each of these three ranges the corresponding
three points of the A switch are indicated as IE5,
H5 and I25, in approximation of the actual volt
ages met in the nominal 110 volt line L1, L2. The
operator then, with the aid of the voltmeter V
and knowing the desired kilovolts to be applied
to the X-ray tube X, can easily select the proper
position for the switch AB which will thus by a
single setting of a single handle, give him a close
approximation to ideal control of the high ten
sion circuit of the tube under the instant circum
stances. It is understood that ordinarily in oper
ation of the apparatus as a whole, the handle AB
is properly set before closure of the switch E to
actually energize the tube.
What we claim is:
1. Means for controlling the high tension cir
cuit of an X-ray tube from its supply
line and comprising a transformer, primary
switch means arranged to vary the relation of 5
said line to said transformer, secondary switch
means arranged to vary the relation of said trans
former to said tube, an operator-operated control
member, each of said switch means including a
part connected to said control member for move 10
ment responsive thereto, and said switch means
including contactors so arranged that for each
relation established by one switch means a series
of relations may be selected for the other switch
means.
2. Means for controlling the high tension cir
cuit of an X-ray tube from its supply line and
comprising a transformer, primary switch means
arranged to vary the relation of said line to said
transformer, secondary switch means arranged to ‘
vary the relation of said transformer to said tube,
said switch means including coaxially movable
parts interconnected for their coincident opera
tion as a unit, and said switch means including
contactors so arranged that for each relation es- ~ '
tablished by one switch means, a series of rela
tions may be selected for the other switch means.
CAPERTON B. I-IORSLEY.
EDWIN R. GOLDFIELD.
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