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Патент USA US3100392

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Aug- 13, 1963
J. R. HUBBARD ETAL
3,100,387
LAUNDRY APPARATUS HAVING AUTOMATIC CLUTCH CONTROL
Filed Dec. 10, 1958
2 Sheets-Sheet 1
P/G. 2.
43
M
A; 4,
F74. a.
BY
Aug- 13, 1963
J. R. HUBBARD Em.
3,100,387
LAUNDRY APPARATUS HAVING AUTOMATIC CLUTCH CONTROL
Filed Dec. 10, 1958
2 Sheets-Sheet 2
a /64
ZZ
BY
United States Patent 0
1
ICC
1
2
system, when said transmission is conditioned for operat
ing at the aforesaid higher speed, intermittently to inter
rupt the power input to the rotating drum thereby effec
tively to reduce its speed to a value substantially inter
mediate the tum-ble speed and the higher speed.
3,106,387
LAUNDRY APPARATUS HAVKNG AUTOMATIC
'
.
CLUTCH (IUNTROL
.
James R. Hubbard and Stanley V. Horecky, Moorestown,
N.J., assiguors, by mesne'assiguments, to Philco Corpo
ration, Piriiadelphia, Pa, a corporation of Delaware
Filed Dec. 10, B53, Ser. No. 779,351
.
7 Claims.
‘Patented Aug. 13,1983
(Cl. 68—12)
For a full understanding of the invention, and of the
manner in which principles thereof may be carried out,
reference may be had to the accompanying drawing, in
>
which:
This invention relatesto laundry apparatus and more, 10'
particularly, to laundry apparatus of the type adapted
automatically, according to a predetermined cycle of ,1
'
>
FIGURE 1 is a perspective showing of laundry appa
ratus embodyingthe invention;
FIGURE
operations, both to wash and to dry clothes.
While of broader applicability, the present invention
is an elevational showing, partly in section,
of the apparatus'seen in FIGURE 1, as viewed from, the
has particularv utility in laundry. apparatus ‘adapted to 15
rear;
.
_
FIGURE 3 is a sectional view of the transmission with
operate in the manner disclosed and claimed in US.
parts broken away, and looking generally in the direction
Patent No. 2,760,639, issued August 28, 1956, and as
indicated by arrows 3-3 as applied to FIGURE 2; ,
signed to the assignee of the present invention. Brie?y,
FIGURE ,4 is a diagrammatic showing of electrical
this patent relates to ‘a method for centrifugally extracting
control circuitry embodying a preferred form of the in
liquid from and air-dryingfabric materials, which mate- 20
rials have been washed in a cleaning liquid by low speed
FIGURE 5‘ is a sectional view of one form of cen
tumbling within a basket or drum having a‘ lower portion
trifugal switch means indicated in FIGURE 4, and as
which dips into said liquid. A major portion of the liquid ‘ embodied in apparatus shown in FIGURE 2; and ,
vention;
,
a
i
.
retained by the materials immediately following the wash
FIGURE 6 is a showing similar to FIGURE 4, and
cycle is extracted therefrom by rotating the drurnvat a 25 illustrating a modi?cation of the invention.
first or intermediate centrifuging speed higher than the
Now making more detailed reference to the drawing,
mentioned tumbling speed but lower than the ?nal cen
and ?rst to FIGURES 1 and 2, the invention is embodied
trifuging speed. The rotative speed is then reduced below
in combined washing ‘and ‘drying apparatus including cabi
A the ?rst centrifuging speed tova point su?icient to permit
net structure 16 having mounted thereon control means 11
the materials to fall ‘by gravity away from the wall of the 30 and a door 12 that provides access to an opening corn-1
drum followed by increasing the speed of the drum to a
municating with the interior of a clothes washing and dry
higher speed in excess of the ?rst centrifuging speed. .
ing chamber mountedwithin the cabinet structure.
After a suitable period of rotation at this higher speed,.
The clothes chamber comprises a horizontally extend- '
and upon initiation of the drying cycle, the rotational
ing perforate drum or cylindrical basket 13 (FIGURE 2)
speed is reduced to that suitable for tumbling, whereupon 35 which is mounted for rotating movements about a hori
the clothes again fall awayfrom ‘the inner peripheral wall .
zontally extending hub 14. Drive means for rotating the:
of the drum. This falling away of the clothes from the
drum includes a motor 15, and a transmission 16 driven
periphery of the drum just prior to the drying cycle desir?
‘ thereby and ‘arranged to drive a belt 20 which engages‘
ably provides for an optimum amount of material surface
a pulley 21 mounted to the drum in the region of said
vexposed to the drying air currents that pass through the 40 hub.
cylinder. This is best accomplished by rotating the cylin- ,_
As will 'be hereinafter more ‘fullyexplained, an idler
der slowly and tumbling the material therein in such,
pulley 22 is arranged. to engage‘ a portion of the belt, said
manner as to expose ‘substantially all surfaces to the dry
idler pulley being driven by the ‘belt and further arranged
ing air currents.
,
.
,
to drive suitable centrifugal switch means, for example
In order to carry out the above advantageous sequence‘ 45 that shown in FIGURE 5, in accordance with teachings
of operations it has been necessary in the past to provide
of the present invention. ‘I The idler pulley is mounted for
suitable shiftable transmission means driven by a contant
rotatable movements on an arm '23‘ that is pivotally mount
speed motor, in combinationwith means operable in re
ed, as seen at 25, upon housing 24.; A spring 26 reacts
sponse to a suitable programming device, suchas a timer,
between arm ;23 and‘housing 24 "and resiliently urges
to shift the transmission means an'dprovide the desired 50 pulley 22 against belt 20.
‘
‘ 1
f .7
drum speeds—including low or tumble, inter-mediate, and
‘As is‘ well known in the art,
13 is rotated at a
high.
.
'
e
.
>
lower speed in the washing operation either to tumble
I
It is therefore an object of the present invention to‘
provide a simpli?ed drive means for carrying out the
above-described sequence of operations.
~ ‘the clothes or, 'when'operated ‘at a higher ‘speed, to. cen
trifuge the clothes to extract moisture therefrom, and
55 during the drying operation to turnble the clothes at the
'
Another object of the invention is to provide, in com
bination with a multispeed transmission, means responsive
to rotational speeds of a member driven with said trans
mission to modify, cyclically, the energy delivered to the
driven member thereby to provide rotational speeds of 60
lower speed uniformly to expose the ‘fabrics or clothes
being dried to circulating heated ‘air, thereby facilitating
the ‘drying operation."
,
As is seen further in FIGURE 2, while the ends 30‘,
30a of drum 13‘ are preferably imperforate, with the ex
the latter other than those provided by the transmission
ception of a loading aperture (not shown) in registry with
door 12., the cylindrical surface portion 31 of the ‘drum
i It is a speci?c object of the invention to provide simple
has perforations '32 to permit passage of heated circulated
\means in combination with a two-speed transmission
air through the‘ drum to ,dry clothes disposed? therein.
* 65 Housing 24 isspaced from andv encloses the drum 13,
.nvhereby three speeds are attainable therefrom.
per se.
‘
'
.
,
1
In the achievement of’ the foregoing, as well as other’
objectives, a preferred embodiment of the present inven
tion contemplates provision, in laundry apparatus, of two
and an electrical resistance heater 3% is disposed within
, an inwardly presented recessed portion 34 of the drum
enclosure 24'. Means for cooling'the circulated air may
include a water vapor condenser (not shown) disposed
ing ‘drum a lower, or. tumble, speed and a higher, or cen- 70 withinthe enclosure, in the region of embossed portion
trifuging speed, and this in combination with means opera
35 located opposite‘ the heater 33'. Circulation of the, air
tive, in correspondence with rotational speed of the driven
is effected through rotation of the drum in combination
speed transmission means, capable of imparting to a rotat- '
8,100,387
3
4
.
with temperature vgradients existing between the relatively
through the gear 513‘ at high speed, and =low speed gearr43
warm heater and the cool condenser. While details of the
aforementioned structure need not be described further
in connection with the present invention, a preferred struc—
mounted on the counter-shaft rides idly thereon.
tu-re is disclosed and claimed in the co-pending applica
tion ‘of Ernest G. Orr, Serial No. 740,103 ?led June 5,
1958, now US. Patent No. 3,018,562, and assigned to
the assignee of the present invention.
Means‘ associated with control means 11, for con
trolling the temperature within the clothes drying chamber, 10
determined cycle is controlled "by means 11 (FIGURE 1)
comprising a multiple switch 64 disposed in series elec
_
I With reference to FIGURE 4, means for energizingv
the motor and the solenoid in accordance with a pre
trical circuitry with a source of energy L and a parallel
circuit comprising said solenoid 57 and said motor 1'5.
Switch '64 includes a shaft 651 that is manually rotatable '
for indexing by a knob v66, and driven by a small con
includes suitable thermostatic elements associated with
stant speed motor 70. Shaft 65 carries a series of cams
the interior of the drum enclosure 24 and disposed in
71, 72, and '73 arranged to open and close respective
switch contacts 74, 75, and '76 which control circuits in
suitable ‘electrical circuitry with the heater. One such
means for controlling the temperature is disclosed and
cluding the motor 15 and solenoid 57. ‘The sequence of '
claimed in the co-pending application of Arthur Beren
steps with which the present invention is concerned, and
as hereinbefore described, is predetermined by and in
accordance with suitable shapes of the cams 71, 72 and
baum, Serial No. 768,101, ?led October 20, 1958, now
Patent No. 3,044,181, and assigned to the assignee of the
present invention.
73.
It is of course to be understood that means for
admitting and expelling wash water :as well as for en
mission 16 forming part of the driving connection be 20 ergizing the heater, while not forming a part of the in
vention, may be of any known suitable variety, and may
tween the motor 15 and the drum pulley 211 is capable, per
se, of producing, selectively, a lower or a ‘higher drum
also be controlled by additional cams and switch contacts
as needed and associated with the shaft 65.
speed when driven by a constant speed motor. This
The motor 15 is of the split-phase induction type pro
motor is of a conventional type having formed integrally
therewith a housing 3t6'and an armature shaft 40 extend 25 vided with a ‘starting winding 80 and a' running winding
81 arranged in parallel circuitry; and each being disposed
ing outwardly from the motor to form the drive shaft to
in series ‘circuitry with switch contacts 74. Armature
the transmission. The transmission is also of a conven
shaft 40 of the motor is arranged to drive the two-speed
tional type and is disposed within an open ended housing
' Now referring to FIGURE 3 of the drawings, the trans
transmission 16 (FIGURE 3), the particular higher or’
41‘ disposed adjacent the end of the motor housing 36,
said end together with the housing 41 serving completely 30 lower speed being determined, respectively,»by energiza—
to enclose the transmission ‘16.
tion or deenergization of the solenoid 57 as hereinbefore
A pinion 42 is formed integrally with armature shaft
Suitable centrifugal switch means 82 is disposed’ in‘
40 and ldrivably meshes with'the teeth of the large gear
series electrical circuitry with starting winding 80 and
' 43‘, the latter being loosely sleeved on the driven counter
‘shaft 44 journalled ‘within the transmission housing 41. 35 includes a ?xed contact 83 and a movable contact 84.
The movable contact 84 is operable, to open and close
Counter-shaft 44 is parallel to armature shaft 40 and is
the starting winding, by a disc 85 axially movable along
' provided with a pulley 45 (FIGURE 2)_.
explained;
'
‘
'
the armature shaft by pivoted weights 86 mounted to said
A clutch member 46 is mounted to armature Sh?l?t 40,
shaft, and which, at a predetermined motor speed, swing
for rotation therewith, and conical clutch shoes 50 are
attached to the member 46. These shoes are arranged for 40 radially outwardly against the resistance of springs 87.
The weights have extensions with ends seated in grooves
seating in a correspondingly shaped recess in a second
formed in the periphery of disc 85. The disc 85 is there
clutch member 51 loosely sleeved at the end of armature ‘
shaft 40. ‘This second clutch member 5-1 is provided with
by axially movable along armature shaft 40‘ in response
teeth 52 that mesh with a gear 53‘ mounted on the counter
to radial movement of weights 86. Thus, when the motor
starts and the proper constant motor speed is attained,
the weights shift disc 85 far enough to permit spring 90 to
urge the contacts 83 and 84 apart and deenergize the
shaft ‘44 for rotation with the latter. The arrangement
is such that low speed drive is through the pinion 42 and
gear 43, and high speed drive is through gears 52 and 53‘.
The gears 43 and 53 arranged along the counter-shaft
starting winding. In further accordance with well known
practice, a capacitor 91 is placed in series with the start
44 are releasably connected to one another by means of
50 ing winding.
.
'
a one-way drive connection in the form of a suitably ar
In particular accordance with the invention, and re
ferring further to FIGURE 4, a further centrifugal switch
' ranged coil spring ‘54, anchored to gear 431 by pin 54a,
and, which tends to tighten about the respective shoulder
portions 55 and 56 of the gears 43‘ and 53‘ when driven
V in one directionandwhich tends to loosen and unwind
, from the shoulders when driven in the opposite direction.
When thereis no pressure on the clutch members 50,
means 92 is driven with the idler pulley 22, and the con- -
55
tacts 93, 94 are disposed. in series electrical circuitry with
switch contacts 76 and the solenoid 57. 'The aforemen
tioned switch contacts 76 and 93, 94 are in parallel cir
>51 they'separate slightly axially and lower speed drive
cuitry with switch contacts 75, and centrifugal force-re
occurs from the pinion 42'through the gear 43 clutched
by spring 5-4to 1gear 53 keyed to the counter-shaft 44,
sponsive means for operating the switch 92 include resil
iently restrained weights 95 and disc 96'. A more detailed
’ 7
description of this apparatus is included in what follows.
FIGURE 5 illustrates, in somewhat more detail, cen
To obtain higher speed, a solenoid 57_(FIGURE 2)
trifugal switch apparatus 92 which has been modi?ed
is energizedby means hereinafter to be described, to move
slightly in order to combine the same with the pulley 22
toward the left, with reference to FIGURE 3, and in so
doing moves a link (not shown) interconnecting the sole 65 thereby to provide a compact unitary structure embody-g
ing these elements. Pulley 22 is rotatabiy mounted by
noid and a lever 60, pivotally mounted to housing ‘16 by
suitable bear-ing means upon a pin 19 ?xedly mounted to
a pin-5,9. :Lever 60 is suitably linked by a pin 61 to the
while gear 52 turns freely.
'
end of athrust shaft 62 which is coaxial with respect'to
armature shaft 40, and axially movable through an open
,ing 63' in the transmission housing‘41. Operating sole~
noid 57 applies axial pressure, through a link and a lever
60,.to‘ shift the gear-clutch 'member 51 toward clutch
lever 23. A switch plate 93b is mounted to the lever 23 i’
and includes ?xed contact 93 and movable contact 94‘;v
carried by the resilient arm 94b. A switch operating
member 940 extends away from arm 94 and toward the
pulley. One side of the pulley is concave and bracket '
means 22b is attached to the pulley and disposed in the
member 46 thereby effecting engagement of the clutch
region of concavity of the latter. Weights 95 are car
members and causing the armature shaft 40 to_ drive the
ried by bracket means 22b and are pivotally mounted
clutc1h~gear52. This drives the counter-shaft 44 directly 75 therein for radial movements (see broken-line showing)
.
,
3,100,387
5
6
in response to predetermined rotational speeds of, the
pulley. ,A disc 96 is axially movable along pin 19 and is
connected to ends of weights 95 by springs S. Disc 96 is
vides driving apparatus capable of producing, selectively,
slida'bly engaged by member 940.
rotation of a clothes drum at three di?erent speeds.
Thus, the foregoing novel arrangement of a two-speed
transmission and speed responsive switching elements pro- '
'
In the operation of this modi?ed apparatus large ends
of weights 95 move radially outwardly when the pulley
is rotated at a predetermined higher speed, thereby pivot
ing the smaller ends of the weights radially inwardly to
In accordance with the modi?ed embodiment shown in
' FIGURE 6, and claimed in the copending, sole divisional
application of James R. Hubbard ?led February 9, 1962,
Serial No. 172,345, and assigned to the assignee of the
move springs S and disc 96 toward the pulley. Motion of
present invention, the above described sequence of opera
the disc releases pressure upon member 940 thereby per 10 tions is advantageously provided by disposing a suitable
mitting resilient arm 94b to move downwardly and open
centrifugal switch 92a in parallel circuitry with motor
contacts 93 and 94. This deenengizes the appropriate cir
energizing contacts 74a of multiple switch 64a, these con
cuit, whereupon the rotational speed of the pulley drops
tacts being in series with line L and the motor 15a. Also,
and effects reversal of the aforementioned movements
the multiple switch includes a set of contacts 75a arranged
again to close the contacts and to energize the appropriate 15 to energize and deenergize solenoid 5711, as provided for
circuit.
‘
by line L. As indicated, switch 92a is associated with
A resistor R (FIGURE 4) is also disposed in series with
motor shaft 40a, and is thereby responsive to rotational
the aforementioned switch contacts 93, 94 as indicated.
speeds of the motor.
‘
v
As will be more fully understood from the ensuing de
In the Washing-drying sequence of operations, the
scriptionof the operation of the above described apparatus 20 clothes drum is driven at its tumble, or lower, speed by
in a predetermined sequence, resistor R functions advan
closing switch contacts 74a and opening switch, contacts
tageously to minimize noises arising from impact of the
operating elements of the solenoid. In considering a representativepredetermined sequence
of operations comprising a washing cycle followed by a
75a. This conditions the transmission, by deenergizing
solenoid 57a, for lower speed operation, and closing of
contacts ‘74avobviates any effects due to operation of
switch 92a having contacts 93a~and 94a disposed in paral-.
drying cycle, and making particular reference to FIG/
lel with contacts ‘74a.
_
>
,
a
The desired intermediate centrifuging speed is obtained
by opening contacts ‘Ma and closing contacts 75a, thus
conditioning the transmission for higher speed operation
extraction prior to initiating the drying cycle. After
pumping out the ?nal rinse water contained within en 30 and providing for cyclic energization and deenergization
URE 4, itwill ?rst be assumed that the clothes have been ‘
washed and rinsed, but have not yet received a ?nal water
of the motor 15a in response to predetermined rotational
speeds of the latter. The net effect is, therefore, the driv
ing of drum 13 at the intermediate speed as respects the
closure or tub 24, and upon initiating the ?rst sequence of
water-extracting operations, the switch contacts 74, 75,
76 will be in the positions indicated. Motor 15 will have
lower and higher speeds provided by the transmission.
been energized by the closing of contacts 74, as provided
Higher, or centrifuging, drum speed is then provided
for by cam 71, and switch contacts 75 will be open; 35
by the closing of contacts 74:: and maintaining contacts
However, contacts 76 will have been closed thereby con
75a closed. After a suitable period of operation at this
necting the solenoid 57, through contacts 93 and 94 of
speed contacts 75a are again opened and contacts 74a
centrifugal switch 92, across the line L. The contacts 93
maintained closed to provide the desired tumble speed of
and 94 are shown as being closed, but it will be under
stood th‘at contacts of centrifugal switch 92 will alternately 40 thetdrum'for the ensuing drying operation.
While the present invention has been illustrated as being
be opened and closed in response to rotational speeds of
embodied in apparatus utilizing a gear-type transmission
pulley 22, thereby alternately deenergizing and energizing
it is to be understood that a variable speed belt drive may
solenoid 57. By thus operating the solenoid, the trans
be used as well, in place of the above mentioned trans
mission wi-ll alternately be conditioned for operating, re
spectively, at lower and higher speeds. The action of the 45 mission. Also, speed responsive switch means other than
those illustrated by way of example may be used.
switch 92 is rapid, with the net effect of providing a ro
It is therefore seen that the hereinabove disclosed ap
tational speed of the transmission, ‘and hence the clothes
. paratus provides simple and effective means for operat
drum, having a value intermediate the tumble, or lower,
ing combined clothes washing and drying equipment uti
speed and the higher, or ?nal centrifuging, speed of the
50 lizing a two-speed transmission at different rotational
drum.
speeds, in accordance with an optimum program of such .
Following a predetermined suitable period of opera
speeds heretofore requiring a relatively complex three
tion‘ of the drum at this intermediate speed, and in ac
speed transmission.
,
'
cordance with teachings of the aforementioned Haver
It will be understood that such modi?cations may he
stock'Patent No. 2,760,639, the drum is again operated at '
made in the illustrated embodiments as are contemplated
a lower speed, for example the tumble speed. This is
by the scope of the appended claims.
accomplished by the shaft 165 of switch 64 moving to such
We claim:
- l. vIn laundry apparatus of the type including a rotat
able clothes drum, a motor, a driving connection between
position as to maintain contacts 714 closed and to maintain
contacts 75 land 76 open. This combination of switch
contact positions energizes motor 15 and deenergizes
solenoid "57, also effectively eliminating‘switch 92 from 60 said drum and said motor including a transmission shift
able to provide either a lower or a higher rotational speed
the circuit, thereby conditioning the transmission for the
of said drum, and means for shifting said transmission,
above mentioned tumble, or lower, speed. Following a
suitable predetermined period of drum operation at the
' tumble speed, the shaft ‘65 'Will have rotated to such posi
tion as to provide for maintaining contacts 74 closed and
contacts 76 open, and closing contacts 75, thereby to ener
gize solenoid 57 to'condition the transmission for the
higher speed, or ?nal centrifuging, operation. Follow
ing a suitable period-of ?nal centrifuging, shaft 65 will
have rotated again to such position as to provide, again,v 70.
' ‘ for operation of the drum at its tumble speed, whereupon
the clothes advantageously fall away from the peripheral
wall of the drum andrthe heater 33 is energized in accord
ance with known suitable programming means’ (not
shown).v
'‘
'
selectively, and operative in correspondence to rotational
speeds of said drum alternately to shift said transmission
to said higher and said lower speeds.
72. In laundry apparatus of the type including a rotat
able clothes basket, a motor, a driving connection be
tween said basket and said motor including clutch means
operative selectively to engage and disengage said con
nection, and means for operating said clutch means alter
nately to engage and disengage the same in correspond
ence with rotational speeds of said basket.
' 3. In laundry apparatus, a rotatable clothes drum, a
motor, means de?ning a driving connection between said
75 drum and said motor including a transmission adapted to
8,100,387
7
8'
be conditioned for operating said drum at either a higher
6. In ‘laundry apparatus of the type including a rotata
Y
or a lower rotational speed, and means for conditioning
ble basket, a motor, a driving connection between ‘said
said transmission for operation, selectively, to provide
motor and said basket including a transmission shiftable
either of said rotational speeds, and operative in corre
spondence to rotational speeds of said drum alternately to
condition said transmission for operating said drum at
said higher and lower speeds.
4. In laundry apparatus, a rotatable clothes drum, and
to provide lower and higher rotational speeds of said
basket, a control circuit providing for energization of
said motor and for shifting the transmission between the _
lower and higher speeds, and switch means interposed in ~
said circuit operative to energize said motor and including 7
drive means for rotating said drum at a plurality of
a centrifugal switch operative in correspondence to rota
speeds, comprising: motor means, a transmission driven 10 tional speeds of said basket alternately to cause said trans
by said motor means and adapted to be conditioned,
mission to be shifted between the lower and higher speeds
selectively, for operating said drum at a lower and a
while said motor is energized, whereby to provide a re
higher'sp'eed, and means driven with said drive means and
sultant rotational speed of said basket in a range between
operative in correspondence with rotational speeds there
the lower and the higher speeds.
of alternately to condition said transmission for meta-ting 15
7. Apparatus in accordance with claim 6, and further
said drum at said lower and said higher speed, thereby
including switch means providing for, drive of said basket
to rotate said drum at a. resultant effective speed inter
mediate said lower and said higher speeds.
5. In laundry apparatus of the type including a rotata
ble basket, a motor, a driving connection between said
motor. and said basket including 1a transmission shiftable
to ‘provide, a lower and a higher rotational speed of ‘said
basket, a control circuit providing for energization of said
motor and for causing the transmission to be shifted from
one of said speeds to the other of said speeds while said 25
motor is energized, said circuit including switch means
interposed therein and adapted to be alternately opened
and closed, in correspondence to notational speeds of said
basket, whereby alternately to shift said transmission from
one, of said speeds to the other to drive the basket in a
‘ range between said lower and said higher speeds.
at the higher speed after a predetermined interval of
operation of said basket at said resultant speed.
References Cited in the ?le of this patent
UNITED STATES PATENTS
‘
1,236,113
Seaman ______________ __ Aug. 7, 1917 '
2,387,216
Hood ________________ __ Oct. 16, 1945
2,461,764
Oleott _'__'_ ___________ __ Feb. 15, 1949 r
2,717,350
2,760,639
2,881,597
Broils?ord ____________ __ Sept. 6,1955
Haverst'ock ___________ __ Aug. 28, 1956
Jacobs _____________ __'_ Apr. 14, 1959 "
FOREIGN PATENTS
V
'
829,292
Great Britain _________ __ Mar. 2, 1960
1,153,649
France ___‘ ____ _; _____ __ Oct. '14, 1957
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