close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2125148

код для вставки
July 26, 1938.
N. BRENKERT
2,125,148
ARC INDICATOR SYSTEM FOR PROJECTION LAMPS
Filed Jan. 29, 1937
29
3/
2 Sheets-Sheet 1
32
INVENTOR.
B 916M ‘Bren Re r f
l/M M
ATTORNEY.
July 26, 1938.
Y N. BRENKERT
2,125,148
ARC INDICATOR SYSTEM FOR_PROJECTION LAMPS
Filed Jan. 29, 1937
2 Sheets-Sheet 2
INVENTOR.
BY v/ Neal Drenker’f
ATTORNEY.
Patented July 26, 1938
2,125,148
I UNITED STATES
I
PATENT OFFICE
2,125,148
ARC INDICATOR SYSTEM FOR PROJECTION
LAMPS
-
Neal Brenkert, ‘Detroit, Mich.
Application January 29, 1937, Serial No. 123,026
2 Claims. (Cl. 176-—51)
The present invention pertains to a novel are
indicator system for projection lamps, particular
ly of the type employing carbon electrodes.
Lamps of earlier construction are equipped with
an arc indicator screen mounted on the top of
the lamp, and in the transverse verticalplane of
the arc to maintain the image upright. While
the arc may be satisfactorily projected on the
screen, the position of the screen is such that it
10 frequently cannot be seen conveniently by the op
erator. In order to see the image of- the are on
the screen, he is obliged to move his body consid
erably to one side or the other of the axis of the
machine, thereby taking his attention from other
15 operations that must be simultaneously per
formed at the rear end of the machine‘. This is
particularly annoying to operators of .short stat- -
ure, and as a result, the operator often ?ts-an
elevated bracket upon the lamp housing to hold
20 the screen, or causes the arc image to be pro
Reference to these views will now be made by
use of like characters that are employed to desig
nate corresponding parts throughout.
In Figures 1 and .2 is shown a lamp housing I
of known design except for the particulars speci- 5
flcally described herein. From the rear wall of
the housing extends a protuberance 2 for contain
ing certain parts of the feeding mechanism which
may be adjusted by hand at the knobs 3.
The housing contains a pair of electrodes 4 and 10
5 that form an arc 6. To a side wall of the hous
ing, at some distance above the arc and above
the door ‘I, is secured‘ a bracket 8 (Figure 3)
formed with a mirror frame 9. In the frame is
mounted a mirror it) held in position by a split 15
ring
ll.
-
"
From the bracket 9 a lens tube i2 extends
through a hole I3 formed in the housing ,I. This
tube is positioned so that its axis intersects the
jected on the ceiling of the projection room. arc 6 as may be seen more clearly in Figures 1 20
and 2. The tube l2 contains a spacer tube l4.
Either of these expedients is obviously awkward. At
the ends are plane-convex lenses I5 facing one
and unsatisfactory, as will be recognized by those
skilled in the art.
25
-
One of the objects of the present invention is
to mount the screen in a more convenient posi
tion, offset from the transverse vertical plane of
the arc, and at the same time project an upright
image on the screen. The screen is so positioned
30 that the image may conveniently be seen by the
operator while he is adjusting the controls at the
rear end of the machine, without introducing any
awkwardness in the mounting of the screen or its
supporting parts.
Such offset position of the
35 screen, which may be either forward or rearward,
avoids interference with thelchimney that stands
directly over the arc.
i
-
Another object of this invention consists in
providing a novel and ‘unique mirror arrange
ment for imaging the arc in the desired-upright
position, as will appear more fully hereinafter.
The invention is fully disclosed by way of ex
ample by the following description and the ac~
companying drawings, in which
45
Figure l is a side elevation of a lamp housing
equipped according to the invention;
.
Figure 2 is a rear end view thereof;
.
Figure 3 is a section on the line 3-3 of Fig
ure 1;
Figure 4 is a section on the line 4-! of Fig
ure 2;
,
I
Figure 5 is a section on the line 5-5 of Figure
4, and
V
Figure 6 is a section on the line 6-6 of Fig
55 ure 4.
another- .The upper lens l5 bears against a coil
spring 16 mounted in the upper end of the tube
12. A screw tube I1 is threaded in the lower end 25
of the tube l2 and bears against the lower lens
l5, whereby both lenses and the spacer tube H
may be adjusted as a unit in the tube I2.- The
adjustment is secured by means of a lock nut I8
threaded on the screw tube l1 and bearing against 30
the lower end of tube l2.
'
-At a higher point on the lamp housing, and on
the same sidejis mounted another mirror by the
means now to be described. At this point is
formed an ear IS on the housing near the end 35
wall thereof.- Through the ear is passed a head
less .bolt 20 having an acorn nut 2i screwed on
its outer end and bearing against the ear l9.
-On the other end of the bolt'is loosely mounted
a collar 22. Through the collar and the bolt is 40
passed a right-angled pin 23 for carrying the re
maining mirror frame as will presently be de
scribed. It may be seen, however, that tighten
ing of the nut 2| tends to draw the bolt through
the collar 22, thereby binding the pin 23 by a 45
shearing'action between the bolt and the collar.
As already indicated, the pin 23 serves to sup
port another mirror frame 24, passing through a
lug 25 thereon. A mirror 2'6 is mounted in the
frame 24 and held by a spring ring 21 as shown in 50
_ Figure 4. The mirror 26 is positioned to receive
light from the mirror l0 and project it upon an
indicator screen as will now be described.
For supporting this screen, a frame 28 is se
cured to the rear wall of the lamp housing and 55
2,125,148
2
at an elevation preferably slightly higher than
the mirror frame 24. The rear end of the chim4
ney 29 has been found to be a suitable place for
mounting the frame 28.
The screen.” mounted in the frame 28 is of
5
suitable material, such as frosted glass, so that
the image projected thereon from mirror 26 may
approximately in the transverse vertical plane of
theme, and the upper mirror 25 is offset from
this plane in the ‘direction towards the screen
30, or along the longitudinal axis of the housing.
It has previously been customary in the art, where
two mirrors were used, to mount the upper mirror
directly over the lower mirror, but in the o?set
be seen from either side. The screen has gaugev position of the' screen 30 relative to the transverse
lines 3| on each side, the proper adjustment of the vertical plane of the arc. it was found that such
10 arc’producing an image having a certain rela
tion to these lines, known to the operator and
substantially as illustrated in Figure 1.
Directly above the screen, a frame 28 is formed
with a shield or visor 32 extending in both direc
15 tions. This member shields the screen from over
head light and shadows, thereby rendering the
The offset position of the upper mirror 26 and the
angular adjustments of both mirrors, presently
to be described, resultsin an upright image on
the screen and are therefore important in this '15
invention.
.
awkward that the operator frequently prefers to
The lower mirror it is tilted away from the
vertical axial plane of the ‘housing to re?ect
upwardly and is also turned on a vertical axis
towards the upper mirror 26 to re?ect into the 20
same. Similarly, the upper mirror 26 is posi
tioned at the proper angle to the transverse ver
tical plane of the arc to re?ect to the level of
the screen 86 and is further turned on avertical
axis to throw a beam of light laterallyupon the 25
discard the screen so mounted and provide some
screen at.
_ image more distinct and readily visible.
With the screen in the position described,-the
image may be seen by the operator without tak
ing his attention from the controls 3. Only a
slight movement of the head is necessary, whereas
a screen mounted upon the chimney as formerly
requires the operator to stoop forward and swing
his body sidewise.
These movements are so
other means, usually improvised, for showing the
image.
The screen mounted in the position herein de
30 scribed, although projecting from the housing, is
disposed in the angle between the rear wall of
the housing and the top of the protuberance 3
and is shielded within this angle so that it does
not impede the movements of the operator about
the machine.
,
In order that the are 6 be projected rearwardly
to the screen, both mirrors i0 and 26 are tilted
somewhat rearwardly as illustrated. The mirror
ill nearer to the arc requires no adjustment after
assembly and its frame 9 is held .in a ?xed posi
tion with the bracket 8. The image of the arc 6
is projected by mirrors to the screen 30 along the
arrows shown in Figures 1 and 2.
~
Slight but accurate adjustments of the upper
mirror 28 may be necessary. The mounting de
scribed permits adjustment in three directions.
The assembly is rotatable towards and away from
the lamp housing by turning the bolt 20 on its
axis before tightening the nut 2!. Another ad
justment, lengthwise of the housing, is made by
50
turning the pin 23 in the collar 22 and bolt 20
before tightening the ‘nut 2!. The thirdadjust
ment, perpendicular to the bolt 20, is made by
shifting the pin 23 in the bolt 20 and collar 22
before
tightening the nut 2!.
55
The mirror frame 24 is ?xed to the pin 23 by
any suitable means such as a pin 33 driven
through the pin 23 .and lug 25 of the frame.
It is important that the image be shown’ up
60 right on the screen.
Heretofore there has been
no di?lculty in this connection, as the screen was
In the scale of dimensions illustrated in the
drawings, the following angular adjustments of
the mirrors result in an uprightimage on the
screen 3c: the lower mirror it is tilted 221/2“ away 30
from the vertical axial plane of the housing and
is turned on a vertical axis to an angle of 17°
towards the upper mirror 26. The adjustment of
the upper mirror 26 thenfollows as a matter of
course, as it is only necessary that this mirror 35
be focused upon the screen 88. Thereupon, an
upright image of the arc is produced as a conse- '
quence
viously
ror 26
sliding
.of the mounting of‘ the mirror ill pre
described. Precise adjustment of the mir
is obtained by turning the bolt 2% and
and turning the pin 23 in the manner
already set forth.
'
Although a speci?c embodiment of the inven
tion has been illustrated and described, it will
be understood that various alterations in the 45
details of construction may be made without de
parting from the scope of the invention, as indi
cated by the appended claims.
What I claim is:
1. In combination‘with a projection lamp hous 50
ing, animage indicator screen mounted on the
rear wall thereof, a mirror mounted on said hous
ing and positioned to receive light from the in
terior of said housing, an ear formed on said
housing between said mirror and screen, a bolt
in said ear, and another mirror supported by said
bolt and positioned to re?ect light from the ?rst
mirror to said screen, a collar loose on said bolt,
a pin passed through said collar and bolt, and
means for tightening said bolt in said ear, and
tioned to re?ect light from the ?rst mirror to said
arc, and it was only necessary to mount the
screen.
mirrors perpendicular to said plane with their
In the present construc
a 2. In combination with a projection lamp hous
ing, an image indicator screen mounted on the
rear wall thereof, a mirror mounted on said hous
tion, a more particular arrangement of the mir
rors is necessary to project the arc rearward to ing and positioned to receive light from the in
the screen and yet maintain the, image in an -' terior of said housing, an ear formed on said
housing between said mirror and screen, a bolt
upright position.
_
in said ear, a pin lengthwise rotatably adjustable
The adjustments of the mirrors will vary ac
cording to the size of the lamp housing and rela
tive position of the screen and are, but certain
general requirements are to be observed. The
lower mirror I0 is positioned so that its center lies
co
another mirror supported by said pin and posi
positioned in the transverse vertical plane of the
65 centers in said plane.
70
an arrangement of mirrors caused the image of
the arc to be other than upright on the screen.
in said bolt, and another mirror carried by said
pin and positioned to re?ect light from the ?rst
mirror to said screen.
NEAL BRENKERT.
6.5
Документ
Категория
Без категории
Просмотров
0
Размер файла
399 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа