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Sept; 17, 1946. ~
A. T. STEINGARD-
’ 2,407,854
CARBON HOLDER
Filed March v3, 1945
INVENTOR
,
ATTORN Y
Patented Sept. 17, 1946
.
2,407,854
UNITED STATES PATENT ‘OFFICE
V
.7
2,407,854
'
CARBON HOLDER.
Arthur T. Steingard, New_ York, N. Y.
Application March 3, 1945, Serial No. 580,853
13 Claims. (01. 1764-119)
.1
2
This invention relates to projection lamps and
similar apparatus employing carbons for pro
l2, the slide at its upper end carrying a.‘ clamp
l3 normally used to clampa long positive carbon‘
ducing an arc. More particularly, the invention
relates to a device for supporting what I term
short-end carbons in machines of the class de
for feed in thedirection of a negative carbon I4
supported in a- guide“ by a clamp IS, the latter
being only partially shown. At I1 is shown a
.
5.
scribed to provide for the consumption thereof.
suitably supported positive carbon guide, in which
Still more particularly, the invention relates to.
a holder of the class described employing means
a short-end positive carbon I8 is adapted to be
supported and‘ guided in its movement in the
checking feed of the ‘positive carbon to minimize
direction of the negative ‘carbon l4.
the degree of burning/of the holder, as well as in 10
At I9 is shown: one of‘ my improved carbon
the provision of means of checking movement of
holding devices comprising an elongated tube 20,
a carbon ejector plunger employed in the device.
one end'portion of which is slightly reduced, as
.Thenovel-features of the invention will be
seen at 2|, to receive a sleeve 22 which ?ts snugly
best understood from the following description,
on the reduced end 2| and is held in place by
when taken together with the accompanying 15 riveting-‘over the end of the tube, as seen at 23 in
drawing, in which certain embodiments 'of the
Fig. 2 of the drawing. The tube 20 and sleeve
22 have registering threaded apertures 24 for re
invention are disclosedand, inwhich, the sep
arate parts. are designated by suitable reference
ceiving a set screw 25.
V
characters in each of the views, and in which:
The tube 20 has a bore 26 of common diameter
Fig. l is a diagrammatic side view illustrating 20 throughout the length thereof and ?tting in this
a part of a projection lamp, showing one form
bore is a rod 21, the end portion 28 of which is
of holder which I employ.
adapted to be secured in the clamp l3, as shown
Fig. 2 is an enlarged sectional view of the
in Fig. 1 of the drawing. The other end por
holder shown in Fig. l'detached.
tion of the rod 28 has a downwardlyextending
Fig. 3 is a bottom plan view of a modi?ed form 25 stop pin 29 which operates in an elongated aper
of holder which I employ.
'
ture 30 in the tube‘20. The aperture 30 forms a
Fig; 4 is a section on the line 4-4 of Fig. 3;
split in the tube which terminates in a cross
and
l
‘
‘
cut aperture 3| adjacent the sleeve 22. r The cross
Fig. 5 is a section on the line 5-5 of Fig. 3.
cut aperture 3| gives greater spring properties
In projection lamps such for example as the 30 to the split portion of the sleeve to ?rmly grip
“Ashcraft lamp” and other apparatus of this kind,
the carbon I8 in the end portion thereof‘ in the
it has been customary to use long positive car
manner clearly illustrated in Fig. 2 of the draw
bons which are automatically fed through‘ a
ing. This end of the tube .20 is also preferably
mechanism in the direction of a negative carbon
rounded, as seen at 32, to facilitate passage
in the operation of the apparatus and, in this 35 through the recess of the guide ll in the move
procedure, relatively long ends‘are left unburned
ment of the positive carbon and the holder in
and have been discarded or attempts have been
the direction of the negative carbon M.
made to use the same with adaptor holders.
The‘ stop pin 29 islpreferably so spaced with
These ends, ‘for purposes of description, are re
respect to the end of the rod 21 as to gauge the
ferred to as short-ends, and it is‘the purpose 40 distance of spacing of the end of the holder with
of my invention to provide a holder for short-end
respect to the negative carbon, with the end of
positive carbons by means of which the short
the rod 21 abutting the inner end of the carbon
end may be‘ consumed to the greatest possible
held in the holder Hi. In this way, the greatest
degree and in a manner ‘minimizing the burning
possible consumption of the carbon is provided
off of the end of the holder. At the same time, 45 with a minimum amount of burning-off of the
I provide a holder having means for automat
end of the holder, as experienced in devices of
ically stopping feed of the positive carbon, as
this ‘kind. In this connection, it will be under
well as means for checking movement of an ejece
stood, however, that as the splitend of the holder
tor pin in the holder in removing the stub end
burns-off, it can be re-ground or rounded, as at
of'the burned carbon from the holder.
50 32, to ya point closely adjacent the cross or trans
In Fig. 1 of the drawing, I have diagrammat
verse aperture. 3| or to the point where the tube
ically illustrated part‘ of the mechanism of an
20 has suf?cient spring properties to grip and
“Ashcraft” projection lamp and, in this ?gure,
hold a carbon therein. This burning-off will also
I ll represents a base, in which is arranged a guide
be checked by the pin 29 engaging the inner end.
rod or rods ||, upon which is mounted a slide 55 ,of the aperture or split 30.
“
4
3
Also secured to the rod 21 or the end portion
28 thereof is another stop pin 33, the purpose
of which is to check movement of the rod in the
direction of the split end in the operation of
ejecting a burned out carbon stub, which opera
tion is performed upon loosening the screw 25.
This operation is performed by forcing the tube
20 in the direction of the stop pin 33 in a blow
fashion and may be performed with the rod se
cured in the clamp or with the rod detached
from the clamp 13.
In Figs. 3 and 4 of the drawing, I have shown
a diirerent form of holder 34 wherein a tube 35,
similar in some respects to the tube 20, is em=
ployed with the exception that the tube 35 is made ,
considerably longer and has at one end portion
a split 36, similar to the split 30, and across-cut -
aperture 31 at the base of the split. ‘Ifhe sleeve
22 is dispensed with and, instead, the tube is pro
having a bore of common diameter throughout
the length thereof, one end portion of the tube
being split to provide clamping engagement with
a carbon insertedin said split end, a rod mounted
in said tube, means clamping the. rod against
movement relatively to the tube with oneend
portion of the rod protruding beyond the other
end of said tube to form means supporting the
tube and a carbon mounted therein, and a stop I
adjacent the ?rst named end portion of the tube
adapted to engage a, stationary member for limit
ing movement of the tube in the direction of said
member.
' 2. A carbon holder comprising a tube, said tube
having a bore of common diameter throughout
‘the length thereof, one end portion of, the tube
being split to provide clamping engagement with
a carboninserted in said split end, a rod mounted
in said tube, means clamping the rod against
vided with an extendedend portion 38 spaced 20 movement relatively to the tube, with one end
portion of the rod protruding beyond the other
from the split end portion bya solid or annular
end, of said tube to form means supporting the
wall part 39, the end portion v38 having anelon
tube and a carbon mounted therein, a stop adja
gated aperture 40 therein, through which a stop
cent the ?rst named end portion of the tube
pin‘ l'rl, similar to the pin 33, passes and through
adapted to engage a stationary member for limit
which a clamp screw 42! also-passes. The pin M
ing movement of the tube in the direction of said
and screw '42 are ‘,both in‘ threaded engagement
member, and means on said rod operatively en
with a rod L33, similar to the rod 21, and to this
gaging the tube to check movement of the rod
rod is also secured a, stop pinlid, similar to the
pin 29. It will also appear that the aperture 40
terminates short of the end 36 of the tube 'to form
in one direction in said tube.
'
>
3. A carbon holder comprising a tube, said tube
an annular collar portion 4-5 at said end which
having a bore of common diameter throughout
retains the rod 43 against displacement from the
the length thereof, one end, portion of the tube
tube, 35 and also limits movement of the rod in
being split to provide clamping engagement with
one direction‘in the tube. The screw 42 is adapt
a carbon inserted in said split end, aro-dmounted
ed to draw the rod ?rmly upon one wallof the 35 in said tube, means clamping the rod against
movement‘ relatively toythe tube with one end
tube in the manner illustratednin the enlarged
portion of the rod protrudinglbeyond the other
cross-sectional view of Fig; 5 in retaining the rod
end of said tube to form means supporting the
against relative movement, particularly in the
tube, a stop adjacent the ‘?rst named end portion
feed of the positive carbons 18a in the-machine,
of the tube adapted ‘to engage astationary mem
in the manner previously described,
ber for limiting movement, of the tube in the
It ‘will ‘also appear that, upon loosening the
screw 42, the rod is freed for movement longitudi
.. direction of said member, ‘means on said rod op
eratively engaging the tube ‘to check movement
nally of the tube for ejecting a carbon stub and
in ‘the re-setting of the rod when a new carbon
has been inserted into position;
I
V '
of the rod in one direction in said .tube, and said
last named means and stop .both comprising pins
In both forms of the construction, the bore of
the tube of the holder is the'same throughout its
length and this is particularly important at the
secured to said rod.
is minimized, thus, giving long life and service
against movement, relatively to the tube with
to the holder.
one end portion of the rod‘ protrudingbeyond
‘
, '
4.‘ A carbon holder comprising a tube; said
tube having a bore of common diameter through-:
out the length thereof, one end portion‘ of'the
split end thereof, so as to provide the long use
of the holder as the split end slowly burns off. 50 tube being split to provide clamping engagement
However, .by using metals capable of withstand
with a carbon inserted in said split end, a rod
ing the high temperature, the tendency to burn off
mounted in said tube, means clamping the rod
.
.
,‘
Considering the structure shown in Figs; 3 and
‘the other end of said tube toform ‘means sup
porting the tube, a stop adjacent the ?rstnamed
4 of the drawing, it will 1be apparent that the
end portion of the tube adapted to engage a
holder comprises, primarily, simply a tube and
a rod, in addition to the stop pins and clamp screw
stationary member for limiting movement of the
employed. This provides a very simple form of
tube in the direction of said member, means on
construction and dispenses with the necessity of 60 said rod operatively engaging ‘the tube to check
movement of the rod in one direction in said
shaping the tube and setting the sleeve thereon,
as taught in- Figs. 1 and2'. .
tube, said last named means and stop both ‘com;
Carbons of'the type and kind under considera
prising pins secured to‘said rod, andsaid clamp
ing means comprising ‘a screw engaging said rod.
tion are made in different diameter sizes ‘and it
will be apparent that the holders will be made 65
5. A carbon holder for machines of the class
to suit the different size of carbons employed.
described, said holder comprising an elongated
tube, one end portion'of the tube having an elon
It might also be found desirable to 1ore-‘fabr'icate
gated slot terminating at its inner end in a cross
carbons to a length for main the holder and
calculated to control a predetermined operation of
slot, the slottedend of the tube giving spring
the machine with a small stub end remaining on 70 properties thereto for gripping a carbon therein, 7
completion of the machine operation.
a rod mounted in said tube, said rod having a pin
member operating in the slot of said tube, and
Having fully ‘described my invention, what I
claim as new and-desire to secure by Letters Pat
means for clamping the rod within the tube in
controlling the position of said pin with respect
ent is’:
l. A carbon holder comprising a tube, said tube 75 to the ?rst named ‘end of the tube.
2,407,854 ’
6. A carbon holder for machines of the class
described, said holder comprising an elongated
tube, one end portion of the tube having an elon
gated slot terminating at its inner end in across
slot, the slotted end of the tube giving spring
properties thereto for gripping a carbon there~
in, a rod mounted in said tube, said rod having a
pin member operating in the slot of said tube,
through said sleeve and tube and engaging the
rod to secure said rod in di?ferent positions in
said tube.
10. A carbon holder for machines of the class
described, said holder comprising an elongated
tube, one end portion of the tubehaving an
elongated slot terminating at its inner end in a
cross-slot, the slotted end of the tube giving
means for clamping the rod within the tube in
spring properties thereto for gripping a carbon
controlling the position of said pin with respect 10 therein, a rod mounted in said tube, said rod
to the ?rst named end of the tube, the other end
having a pin member, operating in the slot of said
portion of the tube having an elongated iaper~
tube, a sleeve mounted on the other end portion
ture, and said clamping means comprising a
of said tube, means retaining the sleeve against
screw engaging the rod and operating in the
displacement on the tube, a clamp screw passed
‘aperture of said tube.
15 through said sleeve and tube and engaging the
7. A carbon holder for machines of the class
rod to secure said rod in different positions in
described, said holder comprising an elongated
said tube, and‘means on the rod outwardly of
tube, one end portion of the tube having an elon
the last named end of the tube adapted to check
gated slot terminating at its inner end in a
movement of the rod in the direction of the ?rst
cross-slot, the slotted end of the tube giving 20 named end of said tube.
spring properties thereto for gripping a carbon
11. The combination with a projector lamp
therein, a rod mounted in said tube, said rod
of the class described having a slide with means
having a pin member operating in the slot of
for clamping a carbon therein, a carbon guide
said tube, means for clamping the rod within
spaced with respect to said slide, of a carbon
the tube in controlling the position of said pin
holding device comprising a rod, one end portion
with respect to the ?rst named end of the tube,
of which is adapted to be secured in the clamp
the other end portion of the tube having an
of said slide, a tube slidably engaging the other
elongated aperture, said clamping means com
end portion of said rod, means adjustably clamp
prising a screw engaging the rod and operating
ing the tube on said rod, means supporting a
in the aperture of said tube, and another pin
carbon in said tube, and a stop on said rod adapt
coupled with the rod and operating in said last 30 ed to engage said guide in limiting movement of
named aperture and adapted to check movement
the slide in the direction of said guide.
of the rod in one direction in said tube.
12. The combination with a projector lamp
8. A carbon holder for machines of the class
of the class described having a slide with means
described, said holder comprising an elongated
for clamping a carbon therein, a carbon guide
tube, one end portion of the tube having an elon 35 spaced with respect to said slide, of a carbon
gated slot terminating at its inner end in a cross
holding device comprising a rod, one end portion
slot, the slotted end of the tube giving spring
of whichis adapted to be secured in the clamp
properties thereto for gripping a carbon therein,
of said slide, a tube slidably engaging the other
a rod mounted in said tube, said rod having a pin 40 end portion of said rod, means adjustably clamp
member operating in the slot of said tube, means
ing the tube on said rod, means supporting a
for clamping the rod within the tube in control
carbon in said tube, a stop on said rod adapted
ling the position of said pin with respect to the
to engage said guide in limiting movement of the
?rst named end of the tube, the other end por
slide in the direction of said guide, and means
tion of the tube having an elongated aperture, 45 ‘on said rod checking movement of the tube in
said clamping means comprising a screw engag
one direction thereof.
ing the rod and operating in the aperture of said
tube, another pin coupled with the rod and op
erating in said last named aperture and adapted
13. The combination with a projector lamp
of the class described having a slide with means
for clamping a carbon therein, a carbon guide
to check movement of the rod in one direction in
spaced with respect to said slide, of a carbon
said tube, the central portion of the tube being 50 holding device comprising a rod, one end portion
circumferentially continuous, and said tube hav
of which is adapted to be secured in the clamp
ing common inside and outside diameters
of said slide, a tube slidably engaging the other
throughout the length thereof.
end portion of said rod, means adjustably clamp
9. A carbon holder for machines of the class
ing the tube on said rod, means supporting a
described, said holder comprising an elongated 55 carbon in said tube, a stop on said rod adapted
tube, one end portion of the tube having an elon
to engage said guide in limiting movement of the
gated slot terminating at its inner end in a cross
slide in the direction of said guide, means on
slot, the slotted end of the tube giving spring
said rod checking movement of the tube in one
properties thereto for gripping a carbon therein,
direction thereof, the carbon supporting means
60
a rod mounted in said tube, said rod having a pin
of the tube comprising a split end portion of the
member operating in the slot of said tube, a
tube, and said adjustable clamp means compris
sleeve mounted on the other end portion of said
ing a screw engaging said rod.
tube, means retaining the sleeve against dis
placement on the tube, and a clamp screw passed
65
ARTHUR T. STEINGARD.
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