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Патент USA US2113798

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'April 12, 1938.
,
D. MULLAN
'
_ 2,113,798
EXHAUST VALVE FOR LAMP MAKING MACHINES
Filed June 27, 1936 '
s Sheets-Sheet 1
INVENTOR
,0. Mall/9
BY. 21¢ .9.
ATTORNEY
April 12, 1938.
2,1 13,798
D. MULLAN
EXHAUST VALVE FOR LAMP MAKING MACHINES
.F'iled ‘June 27, 1936
3 Sheets-Sheet 2
29
Jj $57
I
IV
a
INVENTOR
April 12, 1938.
D. MULL-AN
,
2,113,798
EXHAUSTv VALVE FOR LAMP MAKING MACHINES
‘ Filed June 27, 1956
s Sheets-Sheet :5
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Patented Apr. 12, 1938
I 2,113,798
UNITED STATES ‘PATENT OFFICE
EXHAUST VALVE FOR LAMP MAKING
‘
MACHINES
'
Daniel Mullan, Kearny, N. .L, assignor, by mesne
assignments; to . Westinghouse Electric and
, Manufacturing Company, East Pittsburgh, Pa.,
a corporation of Pennsylvania '
Application June 27, 1936, Serial No. 87,702
9‘ Claims. (01. 176-2)
This invention relates to machines 'for ex
hausting and gas-?lling hollow bodies, and par
ticularly to such used for the manufacture of‘
incandescent electric lamps or similar devices.
Exhaust machines used in the lamp making in
oi
‘dustry usually comprise a rotary conveyor on
which a plurality of what are termed exhaust
ports are arranged along the periphery of ‘the
conveyor. The conveyor is, in fact, a rotary
10 valve including top and bottom valve sections in
the form of circular plates.
The valve plates are relatively movable and
the relative movement of the .plates, by reason of
suitable channels and ducts, results in an open15 ing and a closing of vacuum lines to which hollow
bodies such as lamp bulbs or the like are con-'
2
valve for an exhaust machine in ‘which multiple
valve ports are provided for each device to permit
an arrangement whereby such ports may be
moved successively into communicationlwith a
‘vacuum line to give a substantially continuous
exhausting operation.
_
-
V
I
Another object of the invention is to provide
a valve arrangement in which asubstantially
continuous exhausting operation may be per
formed without subjecting the valve members to
excessive wear.
‘
10'
'
Other objects and advantages of the invention
‘will be more clearly understood by reference to
the following description together with the
accompanying drawings in which:
-
Fig. 1 is a plan view of a machine constructed
nected for an exhausting operation.
in accordance with the present invention;
It will be readily appreciated that under the‘ fFig..2 is a, diagrammatic plan view of the ma
continuous operation to which machines of the chine shown in Fig. 1 but showing the arrange
abovetype are subjected, the valve sections must ment of the pumps and vacuum lines or mani
be so constructed as to operate with a minimum
amount ‘of wear, and further that any. con
centrated wear on the opposing surfaces of the
folds;
'
Fig. _3 is a view taken on line III—III in Fig. 1;
Fig. 4 is a view' taken on line IV-IV in Fig. 3
, valve sections results in leakage with the con- . looking at the under side‘ of the top valve section;
Fig. 5 is, a view taken on line V—V in Fig. 4;
25 sequent failure to produce the desired degree of
Fig. 6 is a view taken on line VI—VI in Fig. 3
vacuum. In the operation of an exhaust ma-.
chine, a device is exhausted in stages. During looking at the top of the bottom valve section; '
Fig. 7 is a view taken on line VII—VII in Fig. 6;
this removal of gas from’ the bulb at each stage,
it is necessary for the’ lamp to; be connected 1;
Fig. Bis a view taken on line VIII-T-VIII in Fig.v
These ports‘ were spaced a selected distance
6; and
Fig. 9 is a fragmentary view. showing the rela
apart and as this distance was necessarily long to ‘
tive positions of ports in an upper valve section
30 several ports in the valve.
.
‘
30
provide adequate contact for maintaining a seal, and slots in. a lower valve section as one pair of‘
each device was cut oif from ,the pumps for a ports is leaving one slot and moving over another.
relatively long period when traveling through a ' I The present invention may be embed. .d in any
stage of exhaust. This resulted in a drop in the
vacuum in therdevice at each cut-oft period and
imposed extra work on the pumps to bring the
device to the required vacuum.
/
,
suitable type of exhaust machine such as used for
the progressive evacuations qf.~hollow bodies,v and
particularly in connection'with electric vacuum
devices such as incandescent electric lamps, radio
It has been proposed to make the valve sections
40 with
elongated slots or ports arranged~ in close
tubes, and the like.
proximity to reduce the distance of cut-off. ,This
expedient, however, reduced the contact area be
tween the ports and after continued use slight
45 grooves would wear. between the ports, bringing
purpose are usually provided with two pumps; a
preliminary exhaust pump,‘ and what is known as
a ?nal exhaust pump. The devices to be evacur
ated are ?rst connected with the ?rst or prelim
'
40
Exhaust machines , for the ‘above mentioned
about a condition which-was detrimental to the ’ inary pump, and exhausted as they travel: that
efficient operation of the machine. I
,
is, they are moved from one port to another while
on the preliminary exhaust pump.
‘ '
It is an object of the present invention to pro
The same procedure is followed when the de
vide an improved form of exhaust valve in which
vices are subjected to the second pump or ?nal
50 the time of cut-o? is reduced.
Another object of the invention is to provide exhaust. In exhaust machines‘ as heretofore
valve plates for an exhaust machine in whichthe constructed, a single row of ports was provided .
valve ports are so arranged as to provide a sub
stantially continuous exhausting operation.
55 ‘ Another object otthe invention is to provide a
and the device moved successively'from one port }
to the other. Thusit was necessary to keep the
ports separated‘ to maintain an effective seal.
55
2
2,118,798
In accordance with the present invention each
An oil trap 40 is provided between the nipple
conduit fora device is provided with a plurality
and the conduit 42. Each nipple is provided with
of ports arranged to communicate with a plurality
a cut-off means; comprising a cam 43 ‘movable
of slots disposed in two circular rows and in
about a pin 44 so that at the proper place during
staggered relation. Thus as the conveyor moves
movement of the conveyor the cam is operated
and the valve is operated, communication is had , to pinch the nipple 4| and close the passage
with the pump. During the travel of a device through conduit42, as for example; when the
from one port to another, one port is closed while exhaust line is closed and. gas is admitted or with
the other is opened, and since the ports may thus drawn from the bulb, or for other purposes. The
10 be widely separated, an effective seal is main
tained.
'
The invention may be applied to an exhaust
'15
machine comprising a conveyor, indicated as a
operation is given.
Whole by the reference character 9, having a cen
tral rotatable hub or shaft l6 on which is mounted
a carrier plate or ?ange H suitably fastened to
A machine of the present type is usually pro
vided with a duplex pump including a prelim
the shaft l6 and rotatable therewith.
The shaft is provided with a worm wheel i2
and mounted for rotation in bearings l4 and I4’
on a stationary supporting frame or bracket IS.
A worm i6 on a shaft I1 is disposed in mesh with
worm wheel l2. The shaft I1 is provided with a
pulley l8 over which a belt I! leads to a pulley 2|
on shaft 22 of a motor 23. This driving mecha
25 nism from the motor provides a continuous drive.
It will be understood, however, that an inter
mittent operation may be provided if desired by
using means such as a Geneva drive which is well
30
opening and closing of the exhaust line by means 10
of pinch cocks is well known in machines of the
present type and no detailed description of this
known and common practice in connection with
Vmachines of the present character.
Th present invention may be used with either
type of machine and the construction shown has
been selected for the purpose of disclosing the
advantages of the present invention when applied
35 to a machine in which the work parts are moved
continuously to attain high-speed production.
In the structure shown, a plurality of what are
termed exhaust ports 24 are positioned adjacent
to'and in spaced relation around the periphery
40 of the plate ll. Sixteen ports are shown in the
' ‘
15
inary pump 45 and a ?n’al pump 46.
The pump 45 is in communication with pump
46 through conduit 41 and intermediate the
pumps is a conduit 48 controlled by valve 49 and
leading to a manifold 5| having branch conduits 20
52, 52', 522, 523, and 52*, connected to the valve
unit. A leak Sdetector 53 is also connected to
the manifold 5i. This leak detector may be of
any well-known type and is'not'shown in detail.
The pump 46 connects with a manifold 54 25
through conduit 55 which leads to the manifold
54 and is provided with valve 56. This manifold
has branch conduits 51, 51', 512, 513, 514, 515, 516,
and 57", connected to the valve unit.
‘
During the process of evacuation the bulbs are
flushed with gases such as oxygen and nitrogen
and when gas lamps are made a ?nal ?lling of
argon gas is provided. As shown in Fig. 2, three
sources of gas conduits are shown and indicated
by the reference characters 56, 59, and 6| con
30
trolled by valves 62, 63, and 64 respectively. The
gas conduits supply nitrogen, oxygen, and argon,
or any other desired gas or gases.
These gases
may be fed to the valve unit at different stages
40
drawings although more or less may be employed. of the conveyor, but inasmuch as the present
Each port includes a ?exible tube- 26 to receive valve may be used with or without the introduc
an exhaust tube 26 of a bulb 21 suitably supported tion of gas in the lamp, further description of the
gas flushing or ?lling is deemed unnecessary.
in a holder 26.
,
.
As above pointed out, the present valve unit is 45
A bulb holder and an exhaust port is usually
45
termed a head and the heads are as a whole in ' constructed to provide a substantially continuous
dicatedsby the reference numeral 29. ._ The heads exhaust operation and at the same time to main
are of similar construction and inasmuch as their tain an effective seal between the valve surfaces.
This is accomplished by providing the upper
structure is well known in the art, it is believed
valve section with double ports 65 and 66 con 50
50 that the showing made is sufficient. As the heads
move with the conveyor, the supported bulbs are nected by a radial passage 61 leading to con
progressively connected to the vacuum pumps by duit 42. The lower valve section is provided with
means of a valvev comprising a top section 3| an outer row of slots 68', 682, 6843, 664, 685, and 688.,
and an inner row of slots 69', 692, 693., 694, 695,
and a lower section 321
>
.55
’
These valve sections are in the form of rings ; 696, and 697. The slots of one row are staggered 55
having ?at opposed surfaces 33 and 34 with an
interposed oil seal fed through passage 36. The
top valve section moves with the shaft III and is
secured to the plate H by dowel pins 35. Pres
with respect to the slots of the other row and
at certain positions the ends of the opposite slots
are in close proximity to a. common radial line so
that if, for example, port 66 is being moved over
the end of a slot the port 65 will be leaving a slot 60
in ?rm relation to the lower section which is - and the distance between adjacent ends of the
slots will be slightly smaller than the diameter of
held stationary by means of dowel pins 31 extend
ilng into the said valve section and into the frame the ports. ‘See Fig. 6 which shows the relative
positions of ports 66 and 65 in dotted lines.
65
It will be obvious that the relative positions of 65
As stated, the valve sections which constitute
60 sure springs 36 serve to hold the upper section
5.
.
,
'
a valve' unit, serve to open and close the vacuum ' the ends of the'slots‘with respect to‘a radial line
lines to the bulbs supported invthe heads. This
valve also serves to admit gas to the bulb, as
when a gas-?lled» lamp is made, and/or to admit
70 other gaseswith which the bulbs are ?ushed in
the process of exhaust.
Each port 24 is pro
vided with a T-member 36 connecting a con-v
duit 39 to a gas inlet} of the valve and with a
rubber nipple 4| and a conduit 42 leading to the
75 valve vacuum inlet.
is dependent on the diameter of the ports ‘66 and
65. Thus, as the upper valve section moves,- one
of the ports 66 or 65 is over a slot in ‘the lower
valve section While the other port is closed. This 70
gives a continuous exhaust operation; ‘avoiding
any “dead" or cut-off stages‘.
I
'
I"
The relative positions of upper valve ports and
the lower valve slots are shown more clearly in
Fig. 9 which is diagrammatic. It will be noted 75
3
2,118,798
that the slots and ports are disposed in what
may be termed different concentric circles X, X’,_
and are so arranged that a row'of ports moves
Thus the operation of exhausting'may be‘con-JY'
tinuous'.
-
As above pointed out, the presentmachine pro- I
vides a valve unit which operates to expedite pro
duction by avoiding any stationary periods and
one port is on a circle concentric with that of ‘ at the same time the valve unit has the advantage
the other port, the centers of both ports being of providing an effective seal’at all times wheth
disposed on a common radial line Y. As'shown, er operating as an intermittent or a continuous
over a row of slots.
Each pair. of , ports lead- .
ing from an exhaust head is arranged so that
the slots are so arranged that as a port moves
from the end of one slot, another port is moving
into communication with another slot. The ad
jacent ends of the, slots are thus positioned so
that the exhaust head is in continual communi
machine.
,
,
.
.
Although a preferred embodiment of the inven 10
tion is shown and described herein, it is to be
understood .that modi?cations may be made
therein without departing from the spirit vand
scope of the invention as set- forth in the an
_
pended claims.
cation with the pump during a predetermined
movement of the valve. With this arrangement
of ports and slots, it is possible to maintain an
effective seal since the contacting area of the
valve sections between the ports and slots is
1.' A valve unit for an exhaust machine for hol
low bodies comprising an upper rotary valve sec
relatively large.
tion havinga flat surface and a‘lower stationary
‘
Although the valve slots may be arranged to
overlap to such an extent'that the exhaust op
eration is continuous, it will be evident that, if
desired, 'the slots may be so arranged that the
bulb may be cut-off from the pump for a brief
period by a variation in the arrangement of the
ports and slots.
,
‘
I claim:
valve section having a ?at surface, said ?at sur
said upper surface disposed on a common radial
line and in spaced relation, means connecting
said spaced ports together ‘for simultaneous con
nection to a hollow body to be exhausted, arou 25
ate valve slots in said lower valve surface ar
ranged to register with said ports, one of said
slots being arranged to move into register with
port at A. The conveyor then moves and the
one of ‘said ports when another slot moves out of .
bulb is connected. to the preliminary pump 45
‘through slots 69', 6.8’, 692, (see Figs. 2 and 6) and
is also connected through slot 693 with the final
register with another ‘port.
noted. these slots are positioned as above ex
plained and the exhausting operation is continu
ous. In accordance with the present construc
tion, a leak detector 10 is provided between slots
692 and 693.
'
After the ?rst stage of the preliminary exhaust
and the above mentioned short-period connec
tion to the ?nal pump, the conveyor moves the
bulb over an inlet 10' for a gas ?lling and at slot '
882 the gas is removed.
During movement over
20
faces being disposed in contact, valve ports in
As will be noted from‘ the drawings (see Fig.
1), the bulb is loaded or‘inserted. into an exhaust
pump. The slots 69', 68' and 682 constitute the
preliminary exhaust at this stage and, as will be
15.
'
'
30
2. A valve unit for an exhaust machine for hol
low bodies- comprising an upper valve section
having a ?at face, a lower valve section having
a ?at face, means for supporting said sections
with said faces in ‘contacting relation, means for 35
effecting a relative rotary movement between said
sections about a common axial line, one of said
faces having‘ a plurality of ports arranged in
spaced relation along a common radial line, the
other face having a plurality of slots positioned 40
on different concentric circles, said slots being
so arranged that as the valve sections move rel
atively, one port is moved into communication
with a slot as another port moves out of com
slots 69‘, B83, and 695, the bulb is connected to the
?nal pump. At 102 the bulb may again be'?ushed
munication with a slot, and means connecting 45
said ports so that the-exhaustlngoperatioh of a
with gas and the gas removed through slot 684
hollow body will be continuous during, said move- ,
which slot connects with'the ?rst or preliminary
ment.
Pump-
.
'
.
'
‘ 3. A machine for exhausting. a hollow body '
The ?nal exhaust is obtained by a movement comprising a rotary conveyona head on said con 50
of the-bulb over slots 696,‘ 685, and 69'! and a ?nal . veyor having an exhaust port, means for making
relatively long slot -68“.- The close relation of the
a gas-‘tight connection between said port and a
portion of. the hollow body. a rotary valve mount- _
exhaust slots and- when the lamp reaches the ?nal . 'ed on the-axis .of said conveyor, said valve having 55
exhaust it may be ?lled with a gas at 1.03 if the > an upper valve section rotatable with said con
lamp is to be gas-?lled.
_ . veyor and a lower stationary valve section, ‘said
slots as above explained, is followed with the ?nal
When the lamp has reached its ?nal exhaust
ing position B, it is tipped or sealed-off by any
valve sections having, contacting surfaces, a plu
rality of valve ports in ,the surface of the upper
and owned by the-assignee of the present appli
.moves from register with .a slot-another‘ port
moves into register with another slot to‘produce
a continuous exhaust operation while providing
su?icient contact area between said surfaces to
suitable mechanismsuch as a tipping torch of valve section disposed on a common radial line 60
in spaced relation, slots in the surface of the
any well known type. The mechanism for hp
lower valve section, one of said slots being ar- ' a
ping off shown in'the present drawings is more ' ranged
to .‘register- with one of said valve ports
clearly shown in copending application Ser. No.
during a movement “of said upper valve section,
37,111, ?led August 21, 1935, by M. E.,McGowan , said slots being so positioned that as one port
cation. With the mechanism shown, the ex
haust tube is heated as it moves betweenv ?res 15.
A portion of the exhaust tube is softened and is
then moved between rotary disks‘ ‘l6 and 11 which
compress the softened portion and seal the bulb.
When the conveyor reaches station 0, the bulb
is lifted from the conveyor'and ?res ‘l8 melt off
the excess portion of the tube.
maintain a seal between the valve sections.
4. A machine for exhausting a hollow body, 70
having a tubular extension, comprising a rotary :
conveyor, a head mounted on said conveyor, an ex- '
haust port for receiving said extension, a rotary ,
The above described mechanism serves to seal - valve unit mounted on the axis of said conveyor,v >
‘ the bulb while his moving with the conveyor. _
said valve unit having an upper valve section and 75
£4
2,118,798
,a-lower valve section, one of said sections being
prising ,a rotary conveyor, an exhaust head
rotatable with said conveyor, said upper‘valve
section having passages, said lower valve section
having passages, the passages in the respective
sections being so positioned as to register during
mounted on said conveyor, a valve unit including
an upper rotary disk valve section and a lower
stationary disk valve section, said sections hav
ing ?at surfaces in contacting relation, means for
relative movement of said sections, a conduit
connecting said exhaust port to the passages in
moving said upper section with said conveyor, an
said upper valve ‘section, gas removal means,
means for connecting the passages in the lower
tube of a bulb, a conduit leading from said ex
haust port to said upper section, a pair of ports
in the surface of said upper section, a passage 10
leading from said ports to said conduit, an ex
haust pump, a conduit leading from said pump
to said lower section, a pair of slots in the sur
face of said lower section, a passage leading from
said slots to said last mentioned conduit, said 15
ports and said slots being so positioned that con
tinuous communication is had between the upper
and the lower sections during a movement of the
upper section for a predetermined part of its ro
10 section with said gas‘ removal means, the oas
sages in said sections being so arranged that dur
ing relative movement of the sections the pas
sages in the respective sections are brought into
register, the positions of the registering passages
15 being such that one pair of opposing passages do
not move completely out of register until another
pair of opposing passages have moved partly
into register.
_
5. An exhaust machine for lamp bulbs com
20 prising a rotary conveyor, an exhaust 'head
mounted on said conveyor, a valve unit includ
exhaust port in said head to receive an exhaust
tary movement, the communication being ?rst be
20
tween one port and one slot, and then between
ing an upper rotary disk valve section and a low- ' the other port and the other slot.
er stationary disk valve section, said sections hav
8. An exhaust machine comprising means for
ing ?at surfaces in contacting relation, means for supporting a hollow body, a rotatable valve sec
25 moving said upper section with said conveyor, an tion and a stationary valve section, said sections 25
exhaust port in said head to receive .an exhaust having surfaces in opposed relation, ports in ra
tube of a bulb, a conduit leading from said ex
dially spaced relation in the surface of said ro
haust port to said upper section, a pair of ports tatable section, a conduit connecting said ports
in the surface of said upper section, a passage with the interior of said body, slots in the surface
30 leading from ‘said ports to said conduit, an ex
of said stationary valve section, an exhaust 30
haust pump, a conduit leading from said pump pump, a conduit connecting said slots with said
‘to said lower section, a pair of slots in the sur
pump, said ports and slots being so arranged that,
face of said lower section, a passage leading from during a movement of said ‘rotatable section a
said slots to said last mentioned conduit, said predetermined distance, ?rst one of said ports is
35 ports and slots being so positioned that as the
in communication with one of said slots, and 35
upper section moves a port is brought into regis- ' then the other of said ports is in communication
try with one slot as another port moves out of
with the other of said slots.
registry with another slot.
9. An exhaust machine for lamp bulbs includ
6. An exhaust machine for lamp bulbs com
ing a valve comprising an upper member having
a ?at lower surface, and a lower member having 40
40 prising a rotary conveyor, an exhaust head
mounted on said conveyor, a valve unit includ
a. ?at upper surface‘ one of said members being
ing an upper rotary disk valve section and a rotatable with respe to the other, said surfaces
lower stationary disk valve section, said sections being in contact, one of said members having
having ?at surfaces in contacting relation, means arcuate slots spaced circumferentialiy around
its ?at surface and staggered alternately on cir
45 for moving said upper section with, and about
the axis of rotation of, said conveyor, an exhaust cles of different radii concentric with the axis
port in said head to receive an exhaust tube of a ‘ of rotation of said rotatable member, said other
bulb, a conduit leading from said exhaust port member having ports opening on its ?at vsurface,
to said upper section, a pair of radially spaced arranged in pairs, and spaced from said axis
of rotation distances corresponding, respectively,
50 ports in the surface of said upper section, a pas
sage leading from said ports to said conduit, an
wzth the radii of said concentric circles, so that
exhaust pump, a conduit leading from said pump
the inner ports intermittently connect with said
to said lower section; a pair of slots in the surface
inner arcuate slots, and at other times the outer
of said lower section and disposed at- different ports intermittently connect with said outer ar
cuate slots, means connecting said slots to ex
55 distances from said axis of rotation, a passage
‘leading from said slots to said last mentioned haust mechanism, and means connecting said
conduit, said ports being positioned to span the
radial distance between said slots, and the latter
so located that as the edge of one ,port moves
60 over the edge of one slot and into registry with
the slot the other port moves over the edge of
and out of registry with another slot.
7. An exhaust machine for lamp bulbs com
pairs of radially spaced ports together and to
lamp bulbs to be evacuated, whereby said bulbs
are alternately connected to said mechanism
through the inner and outer ports and arcuate 60
slots with which they communicate, in order to
improve the exhausting operation.
DANIEL MULLAN.
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