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Патент USA US2134847

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'Nov. 1, 1938.
1. A. YOST ET AL
2,134,847
SEARCHLIGHT
‘Filed Oct. 50, 1955
3 Sheets-Sheet l
Nov. 1, 1938.
|. A. YosT ET AL
2,134,847
SEARCHLIGHT
Filed 001;. 30, 1935
5 Sheets-Sheet 2_
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WITNESSES:
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Nov. 1, 1938.
l. A. YOST ET AL
2,134,847
SEARCHLIGHT
Filed Oct. 50, 1935
54
56
52
5 Sheets-Sheet 3
2,134,847
Patented Nov. 1, 1938
UNITED STATES PATENT OFFlCE
2,134,847
SEARCHLIGHT
Irvine A. Yost, Lakewood, Ohio, and William H.
Jacobi, Wilkinsburg, Pa., assignors to West
inghouse Electric & Manufacturing Company,
East Pittsburgh, Pa., a corporation of Penn
sylvania
Applicaticn October 30, 1935, Serial No. 47,446
10 Claims. (0]. 176—-51)
The invention relates, generally, to search
lights, and, more particularly, to the construc
tion of arc searchlights as regards the support
ing of the arc head mechanism or unit and the
operating mechanism therefor.
Heretofore, it has been the usual practice to
support the arc head mechanism, comprising the
electrode holders, feed rollers, etc., within the
drum in the proper relation to the re?ector by
10, means of a suitable standard or column secured
to the bottom of the drum. Such forms of sup
port perform no useful function other than to
support the arc head unit and are not suflicient
_ ly rigid and stable to maintain the arc head unit
in the same position with respect to the re?ec
tor for all possible positions of the searchlight
drum and under all operating conditions.
In addition, searchlights of large diameter have
been usually designed with a glass front made up
20 of a plurality of segments of glass supported and
retained in the desired relationship by means of
a suitable center piece and a plurality of brackets
vertically disposed diametrically across the drum,
leaving the joints formed by the abutting edges
of the glass segments exposed to the direct light
rays of the beam producing light dispersion and
thus a source of stray light.
It is, therefore, one of the primary purposes
and objects of the present invention to provide for
30 the elimination of the aforementioned defects
and disadvantages by utilizing a form of support
for the arc head mechanism which will rigidly
support it in ?xed relation to the re?ector under
all operating conditions and which will function
35. to eliminate light dispersion produced by the
joints in the glass front.
A more speci?c object of the invention is to
provide for supporting the arc head unit or mech
anism by means of radially disposed brackets or
4 O strips secured to the side walls of the drum in
spaced relation and for utilizing the brackets
both as conductors to carry current to the arc and
as screens to block off the light from the joints
between the glass segments of the front cover.
Another object of the invention is to provide
for utilizing the supporting means for the arc
head unit or mechanism for conducting current
to the arc head or the operating mechanism there
for, or both, as the case may be.
A still further object of the invention is to pro
vide for utilizing the trunnion support of the
drum as a compartment to house the operating
mechanism for the arc head, thus providing a
55
closed compartment without the use of a separate
control casing or box attached to the outside of
the drum.
Another object of the invention is to provide
for utilizing the radial brackets of the support
for the arc head unit or mechanism in conjunc
tion with the radial brackets of the front door
or cover for the drum for the purpose of effec
tively screening the radially disposed joints be
tween the glass segments of the door from the
light produced by the arc to eliminate stray light.
The general object of the invention is to pro
vide a searchlight structure which shall be simple
and efficient in operation and which may be read
ily manufactured, assembled and maintained.
These and other important objects and advan
tages of the invention will become more apparent
from a reading of the following detailed descrip
tion taken in conjunction with the drawings
wherein,
Figure l is a front elevational view of a search
light, with the front door or cover removed, em
bodying the principal features of the invention,
Fig. 2. is a side elevational view partially in
section taken along lines II—II of the structure
of Fig. 1
Fig. 3 is a front elevational view of the front
cover or door for the searchlight structure of
Figs.’ 1 and 2,
Fig. 4 is a view taken along lines IV-IV of
Fig. 3
Fig. 5 is an enlarged top plan View, partially
in section, of the Searchlight showing the manner
in which the operating mechanism is mounted
within the trunnion support, and
Fig. 6 is an enlarged side elevational view in
cross section of the trunnion assembly of Fig. 5.
In the preferred embodiment of the invention,
the arc head unit or mechanism comprising the
electrode holders, feed rollers, etc., is supported
for movement along the longitudinal axis of the
drum by means of a supporting ring or bracket
and a plurality of radial members interposed
between the supporting bracket and the side walls
of the drum. The radial members may be equal
ly spaced and positioned directly opposite or be
hind certain ones of the joints between the glass
segments of the front door in such manner that
they cooperate with the radial supports of the
door to effectively screen all of the door joints
from the light produced by the arc, the radial
supports for the door preferably alternating in
position with the radial support members of the
arc head support.
The mechanism for operating the arc head is
mounted'within one of the hollow trunnion sup
2,134,847
ports and connected to the arc head mechanism body regardless of the drum position and does
by means of suitable drive shafts and universal not subject the drum structure to a concentrated
joints.
strain at only one position.
Certain ones of the radial members of the arc
head support are utilized as current conductors
to carry current to the electrodes or the operating
mechanism, or both, as the case may be, thus
eliminating the use of separate conductors in the
drum to complete the arc circuit.
ll)
Referring now to the drawings, there is shown
in Figs. 1, 2 and 5 a searchlight drum 8, rotatably
mounted for movement about a horizontal axis
on trunnion assemblies 9 and H3, in which the arc
head unit H and operating mechanism |2 there
for are mounted in accordance with the princi
ples of the invention.
It is to be understood that since the details of
construction of the arc head unit I I and operat
ing mechanism |2 do not in themselves constitute
part of the present invention, these elements
have been illustrated in a more or less diagram
matic manner to illustrate the invention without
unduly complicating the drawings. By way of
example, the arc head unit || may be of the
' type that both rotates and feeds the positive
electrode E3 and which is actuated by the oper
ating mechanism l2 by means of a detachable
shaft connection M in a well known manner.
The feed rollers l5 for controlling the move
30 ments of the negative electrode I6 may likewise
be driven through a similar shaft connection I‘!
by the operating mechanism l2.
In order to provide for supporting the arc head
unit it within the drum in the proper relation
C: Cl to the reflector l8 and in a rigid manner by
means which will eliminate stray light and per
form other useful functions as well, there is
utilized an arrangement comprising a supporting
bracket or ring L‘! and a plurality of radial mem
40 bers 2i to_26, inclusive.
As will be observed, the arc head unit II in
this instance is movably supported within the
supporting ring l9 by means of a plurality of
slide rails or bars 21 through 30, which cooperate
with suitable guide ways 3| formed on the inside
of the ring I9. This permits the arc head to
be adjusted along the longitudinal axis of the
drum and enables it to be readily removed for
inspection and repair. The movements of the
arc head may be effected in any suitable manner
such as by the actuating rod or shaft 32 and
gears 33. The adjusting rod 32 may be operated
in any suitable or desired manner from without
the drum in order that adjustments of the arc
head may be made while the light is in operation.
The radial members 2| through 26 are of rela
tively thin flat shape having their narrow edges
exposed to the light source in order to interfere
as little as possible with the projected light.
60 They are suitably secured at their outer ends to
the rim portion 34 of the drum and are secured to
the support ring |9 at their inner ends. As shown
in Fig. 2, the radial members are projected or in
clined outwardly in order that the supporting
structure will not sag as the drum I0 is rotated
about its horizontal axis.
As shown in Fig. 2, the rim portion 34 of the
drum 8 is preferably formed integrally with the
side Walls thereof and extends inwardly in the
form of a ?ange. It provides an enlarged rim
portion of such size as to reinforce the front
opening of the drum in such a way as to strength~
en and increase the rigidity thereof.
It
apparent that this construction is of such
nature as to distribute the load to the rigid drum
The front door or cover 35 for the drum 8
is shown in Figs. 3 and 4 and comprises gener—
ally a rim element 38 which may be hingedly
secured to the drum by means of suitable hinge
lugs 3'! which are disposed to cooperate with
the hinge lugs 38 on the drum. Clamping devices
39 are provided on the drum for securing the 10
door in a closed position.
In this instance, the door is made up of a
plurality of glass segments 4| which are clamped
to the rim 36 by plates 42 and which are sup
ported by means of a center piece 43 secured to 16
the rim 36 by means of radial members 46. In
this instance, the glass portion of the door is
made up of twelve segments forming an equal
number of radial joints 4'| therebetween.
It has been observed that the joints 41 between 20
the glass segments 4| of the door produce light
dispersion which is the cause of a considerable
amount of stray light. In order to provide for
reducing the stray light thus produced without
the use of separate means for this purpose only, 25
provision is made for utilizing the radial mem
bers of both the door and the arc head sup
porting structure to effectively screen every joint
from the projected light.
In this instance, since there are twelve joints 30
to be protected, thus requiring a total of twelve
screening devices, six radial members are utilized
in both the door and the arc head support, the
radial members 46 of the door alternating in posi
tion with those of the arc head support. It is 35
apparent that the radial members 45 in the door
structure are ?xed in position directly opposite
or behind alternate joints between the glass seg
ments and that the radial members of the arc
head support are so positioned that when the 40
door 35 is secured to the drum and in its closed
position, they likewise are positioned directly be
hind the remaining joints. Since all of the
radial members are of thin construction, the total
area thereof which is exposed to the projected
light is so small as to be of no consequence.
At
the same time, these members are of su?icient
thickness to effectively screen the joints from the
projected light.
'
With a View to providing a housing for the 50
operating mechanism I2 for the arc head with
out utilizing a separate control box or housing
secured to the outside of the drum as is the usual
custom, provision is made in this instance for
utilizing one of the trunnion assemblies for this >
purpose.
In this instance, the operating mechanism l2
which may be of any suitable design is mounted
within the trunnion assembly 9. Referring to
Figs. 5 and 6, it will be observed that the trun 60
nion assembly 9 is so constructed that it forms
a compartment on the side of the drum.
The
trunnion member 5| in this instance is integral
with a dome-shaped support member 52 which
is suitably secured to the side of the drum. The
trunnion 5| is supported by means of a suitable
bearing 53 which is carried in the trunnion hous
ing 54 which, as shown in Fig. 1, is adapted to
be bolted or otherwise secured to one of the arms
55 of the trunnion cradle. A suitable opening
56 is provided in the drum opposite the trun
nion which may be covered by a plate 51 in order
to enclose the compartment thus formed. If
desired, the operating mechanism may be mount
ed upon the plate 57 in order to facilitate in its 75
2,134,847
removal from the compartment. As shown, the
trunnion 5! is in the nature of a hollow shaft
through which any additional control devices may
be passed, if desired. The trunnion assembly l0
~ may be of the same construction as the trun
10
3
members for supporting the arc head mechanism
from the sides of the drum, said radially dis
posed members being positioned directly oppo
site the joints between the transparent segments
of the cover.
nion assembly 9 and may be utilized to house
2. A searchlight comprising a drum, a trans
other control devices.
In order to provide for carrying current to
parent cover therefor comprising a plurality of
segments of transparent material, and means
the arc head H and the operating mechanism
l2 therefor, provision is made for utilizing cer
tain ones of the radial members of the arc head
support for this purpose. In this instance, it
is assumed that the arc current also passes
through the operating mechanism l2 and a cir
cuit for accomplishing this purpose is illustrated.
comprising a plurality of radially disposed sup
porting members for supporting the arc-head 10
mechanism from the walls of the drum, said sup
porting members being positioned adjacent to
As shown, the radial members 2|, 23, 24 and 26
upon the joints and eliminate light dispersion.
are insulated by means of suitable insulating
3. A searchlight comprising a drum, a door
for the drum comprising a plurality of glass seg
members 66 from the rim 34 and the support
ing ring IS. The current supply conductors while
201 not shown may be brought in through the arm
58 of the trunnion cradle and connected to the
terminals 59 and 6!, as shown. The internal cir
cuit for the drum may then be formed by con
necting the supply terminals 59 and 6| to the
every other one of the joints between the seg
ments between the transparent cover and the
arc head mechanism thereby to cast a shadow 15
ments and radially disposed support members
positioned adjacent a plurality of the joints be
20
tween the segments, an arc head mechanism,and
means including a plurality of radially disposed
members for supporting the arc head from the
walls of the drum, said last-named radial sup
and 63, by connecting the radials 2| and 23 with
ports being positioned adjacent the remainder of
the joints between the glass segments.
a shunt 64 and by connecting each of the radials
23 and 24 to the terminals 65 and 66 by means
4. A searchlight comprising a drum, a door
for the drum comprising a plurality of glass
of shunts 6i and 68.
segments and radially disposed support mem
bers positioned adjacent a plurality of the joints 30
25 radial members 2| and 26 by suitable shunts 62
As shown in Fig. 2, the
30 circuit is then completed through the are by
connecting the radial member 24 to the positive
electrode holder by means of a suitable shunt
t9 and the radial member 26 to the negative elec
trode holder by means of a shunt TI. The ter
minals 65 and 63 are mounted upon the plate 51
which encloses the trunnion compartment and
suitable connections provided therefrom to those
elements of the operating mechanism which are
to be subjected to the arc current.
It is to be understood that in case it is de
L10
sired to conduct current to the are only, radial
members 2! and 26 may be used for this pur
pose.
In view of the foregoing description, it is ap
parent that the invention embodies features and
principles which are novel and of great utility in
connection with the construction of high in
tensity arc searchlights where the greatest efli
ciency obtainable is desired. The nature of the
arc head supporting structure makes possible its
use for the performance of several functions
thereby simplifying the construction to a con
siderable degree.
Its use as a supporting means
which is its primary function provides for rig
idly supporting the arc head mechanism. Its
auxiliary function in conjunction with the radial
between. the segments, an arc head mechanism,
a bracket member for movably supporting the
arc head mechanism, a plurality of radial mem
bers for supporting the bracket member from
the sides of the drum, said radial members be
ing interposed between the radial support mem
bers for the door and adjacent the joints between
the glass segments.
5. A searchlight comprising a drum having an
integral back portion and a reinforcing ring por 40
tion around the edge of the front opening, an
arc head mechanism, a supporting bracket for
the arc head mechanism, and a plurality of sub
stantially equally spaced ?at shaped radial mem
bers interposed between the supporting bracket 45
and the reinforcing ring portion of the drum for
supporting the arc head mechanism.
6. A searchlight comprising a drum, support
ing trunnions on opposite sides of the drum, an
arc head mechanism, means including a plural 50
ity of radially disposed current conducting mem
bers of ?at shape for supporting the arc head
mechanism from the side walls of the drum,
power supply terminals positioned within the
drum adjacent one of said supporting trunnions,
and means including at least two of said radial
members of the door to eliminate stray light
supporting members for connecting the power
makes it unnecessary to provide separate means
for effecting this function. Its additional aux
supply terminals to the arc head mechanism.
60 iliary function as a current conductor for the
are or the operating mechanism, or both elimi
nates the necessity for placing separate current
conductors within the drum.
Although a speci?c embodiment of the inven
tion has been illustrated and described, it will be
obvious to those skilled in the art that various
changes may be made in the details of construc—
tion such as in the proportion and the design
'7. A searchlight comprising a drum, support
ing trunnions on opposite sides of the drum, an 60
arc head mechanism, means including a plural
ity of radially disposed current conducting mem
bers of ?at shape for supporting the arc head
mechanism from the side walls of the drum,
power supply terminals mounted within the
drum adjacent one of said supporting trunnions
and movable therewith, means for connecting the
1. A searchlight comprising a drum, a trans
parent cover therefor comprising a plurality of
segments of transparent material, an arc head
outer ends of two of said radial supporting mem
bers to the power supply terminals, and means
connecting the opposite ends of said radial sup 70
porting members to the arc mechanism to pro
vide for supplying current thereto.
8. A searchlight comprising a drum, an arc
mechanism, electrically-operated means for ac
mechanism, and a plurality of radially disposed
tuating the arc mechanism, terminal members
of the several cooperating parts without de
parting from the principles herein set forth.
We claim as our invention:
2,134,847
for said electrically operated means extending
within the drum, power supply terminals mount
ed within the drum, means including a plural
ity of radially-disposed members for supporting
the arc mechanism from the side walls of the
drum, means for connecting the outer ends of
one pair of said supporting members to the
power supply terminals, means for connecting
the outer ends of another pair of said support
10 ing members to the terminal members of the
electrically-operated means, means for connect
ing the inner ends of one supporting member in
each pair together to form a continuous con
ductor, and means for connecting the inner ends
15 of the other radial members of each pair to the
arc mechanism.
9. A searchlight comprising a drum, a trans
directly behind the radial joints in the cover,
power supply terminals within the drum, and
means including at least two of said radial sup
porting members for connecting the power sup
ply terminals to the arc head mechanism.
10. A searchlight comprising a drum, an arc
head mechanism comprising a pair of electrode
holders, means including a plurality of relatively
thin radial members for supporting the arc head
mechanism from the walls of the drum, a plu 10
rality of power supply terminals within the
drum, a plurality of power consumption termi
nals within the drum, means for connecting the
outer ends of two pairs of adjacent radial mem
bers to the power consumption and power sup 15
ply terminals respectively, means for connect
ing the inner ends of the radial member in each
parent cover therefor having a plurality of radial
pair together, and ?exible means for connecting
joints therein, an arc head mechanism, means
the inner ends of the other radial members in
each pair to the electrode holders.
20
20 including a plurality of radially disposed mem
bers for supporting the arc head mechanism
from the side walls of the drum, said support
ing members being located within the drum and
IRVINE A. YOST.
WILLIAM H. JACOBI.
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