close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3058339

код для вставки
Oct. 16, 1962
3,058,329
w. w. R. SEARLE
WASHER-EXTRACTOR HAVING A SAFETY CONTROL
Filed April 20, 1961
5 Sheets-Sheet 1
Oct. 16, 1962
w. w. R. SEARLE
3,058,329
WASHER-EXTRACTOR HAVING A SAFETY CONTROL
Filed April 20 , 1961
5 Sheets-Sheet 2
(s4
65)
.92
19/
I
(93
__ _ — _ __._
/90
67
0/
~
53)
86'
89\
I
64\
I
I'
O\
i'_ _ ________I
69)
72
Z76_
"87
Oct. 16, 1962
w. w. R. SEARLE
3,058,329
WASHER-EXTRACTOR HAVING A SAFETY CONTROL
Filed April 20, 1961
s Sheets-Sheet 3
ilnited grates ateat @i‘hce
3,058,329
Patented Oct. 16, 1962
2
1
tating the impeller is rendered inoperative by the energiza
tion of a solenoid.
3,058,329
According to the present invention the solenoid is open
WASHER-EXTRACTGR HAVING A SAFETY
CONTROL
circuited during the spin extraction periods of operation.
Walter William Ralph Searle, Uxbridge, England, assignor
For purposes of illustration the disclosed structure
will be identical with that of the Sibbald application ex
cept for the control which renders it impossible to operate
the washer-extractor in an improper manner.
to The Hoover Company, North Canton, Ohio, a cor
poration of Ohio
Filed Apr. 20, 1561, Ser. No. 104,414
Claims priority, application Great Britain May 12, 196i)
6 Qlaims. (Cl. 68-24)
The objects and advantages of the present invention will
become more apparent as the description proceeds when
taken in connection with the accompanying drawings in
The present invention relates to washing machines and
which:
FIG. 1 is a side view of the washer dryer unit of the
Sibbald application partly broken away to show the in
more particularly to a safety control for a Washer-extrac
tor to prevent improper operation thereof and consequent
damage to the machine and its proper functioning as
15
a clothes washer.
terior mechanism,
FIG. 2 is a view of the Sibbald machine from the rear
This application is an improvement over an application
for U.S. Letters Patent by Frederick Roy Sibbald, Serial
No. 104,429, ?led April 20,1961.
That application discloses a washer-extractor including
and showing the drive mechanism for the clothes basket
ing operations and high speed rotation in the same direc
tion for spin extraction operations in which an impeller
clutched,
in the washing operation under certain washing condi
ent invention.
slow speed for tumble washing by the slow speed pulley
the high speed pulley is freewheeling on the basket shaft
a pin 2.7 as is seen in FIG. 4.
and impeller,
FIG. 3 is a segmental View of the rear of the Sibbald
a clothes receiving drum or basket rotatably mounted in 20 unit looking downwardly and showing the mechanism
by which the drive for the impeller is clutched and de
a non-rotary tub for slow speed rotation for tumble wash
FIG. 4 is a segmental cross-sectional view of the Sib
bald unit showing the details of the drive mechanism,
or agitator is rotated within the basket at a high speed
in a direction opposite to the direction of rotation of the 25 and
FIG. 5 is a wiring diagram of the control of the pres
basket during low speed rotation thereof in order to aid
Referring to the drawings and especially to FIG. 1,
tions.
10 represents a washer-extractor unit.
Control means is provided to selectively actuate the
The unit 11} includes an outer non-rotary tub .14, a
impeller so that it may be used or not as desired during 30
clothes basket 15 rotatably mounted therein and an im
the washing operation.
peller 16 rotatably mounted in the basket 15 coaxially
In order to drive the basket at slow and high speeds
thereof.
in the same direction and the impeller at a high speed in
The agitator 16 is driven by a shaft 17 and the basket
the reverse direction a pair of overrunning pulleys are
provided which overrun in the same direction and operate 35 15 by a hollow shaft 18 through which the shaft 17 ex—
tends being mounted for rotation therein by bearings 19
to rotate the basket when rotated in the opposite direc
as shown.
tion.
The hollow shaft '18 and basket 15 are rotatably mount
A reversible motor and transmission is provided which
ed in the tub 14- by roller bearings 21 as shown.
always drives the two pulleys in opposite directions so
A sleeve 26 which, as will presently appear, forms the
that when one pulley is driving the basket the other is
inner or driven member of a pair of overrunning clutches,
freewheeling.
surrounds the shaft 18 and is keyed thereto by means of
During the period when the basket is being driven at
in a reverse direction.
Sleeves 2.9 and 30 surround the sleeve 26 and form
45 bearings for the driving pulleys 32 and 33 when the latter
The high speed pulley is utilized to selectively rotate the
impeller in a reverse direction.
For that purpose an
are rotated in one direction and form the central member
‘ of the previously mentioned overrunning clutches when
the pulleys are rotated in the opposite direction.
The overrunning clutches, one of which is shown at
In order to render the drive between the high speed 50 311, may be of any well known type and act to drive
shaft 18 in a clockwise direction as viewed from the left
pulley and the impeller selective, means is provided for
overrunning drive is connected between the high speed
pulley and the impeller shaft.
of FIG. 4 when the sleeves 231 and 361 are driven in a
rendering the drive between the high speed pulley and
clockwise direction, and freewheel when the sleeves 29
the impeller shaft inactive by rendering the overrunning
and 30‘ are driven in a counterclockwise direction.
drive inoperative and permitting the impeller to rotate
55
As shown in FIG. 4 a plurality of pins 35 extend rear
along with the basket.
wardly from pulley 33 and extend through resilient bush
During high speed rotation of the basket for spin
extracting operations, in which the basket is driven by '
the high speed pulley, the overrunning drive between the
ings in a driving plate 36, drivingly connected to a drive
bushing 37 rotatably mounted on a bearing 38‘ surround
ing shaft 17.
high speed pulley and the impeller overruns so that the
impeller is not driven and merely rotates along with the 60
A driven bushing 39 is keyed to shaft 17 by a set screw
basket.
‘40 and serves to rotate shaft 17 and impeller 16 in a
If, during such operation, the means for rendering the
manner which will presently appear.
impeller drive inoperative should be inadvertently operat
The bushings 37 and 39 are of the same diameter and
ed, a frictional drag would be applied to resist rotation of
are surrounded by a coiled spring 41 which forms an
the impeller along with the basket which is undesirable 65 overrunning clutch of the well known coiled spring type.
for reasons which will appear.
According to the present invention the machine is
controlled in such a manner that it is impossible to actuate
the impeller stopping means during the spin-extracting
The spring 41 is wound quite closely about the bush
ings 37 and 39 in such a direction that when the drive
bushing '37 rotates clockwise the spring 41 unwinds and
the bushing 37 freewheels relative to the bushing 39 and
70 the impeller 16 will not be positively rotated.
According to the Sibbald disclosure the drive for ro
When the pulley '33 drives the bushing 37 counterclock
periods of operation.
3,058,329
'
3
wise the spring 41 will contract about bushings 37 and 39
Referring to FIG. 5, the motor 54 is provided with a
to rotate shaft 17 and impeller 16 in a counterclockwise
running winding 62 and a starting winding 63, series con
direction, during the period when the basket 15 is rotat
nected with a condenser 64, which also forms an element
ing slowly in a clockwise direction. The rotation of the
of the starting winding.
impeller 16 during that period is for the purpose of aid
The main winding 62 is connected across bus bars 65
ing in the washing action during the slow tumbling oper
and 66 which are connected to the opposite terminals 67
ations.
and 68 of any suitable power source.
In order to make the rotation of the impeller 16 selec
A reversible centrifugal switch generally indicated by
tive, a means is provided for preventing the spring 41
the reference numeral 69 is connected in series circuit
from driving the bushing 39 counterclockwise when the 10 with the starting Winding 63 by conductor 70. The cen
bushing -37 is rotated counterclockwise.
trifugal switch 69 is of a well known type such, for ex
For that purpose the inner or driving end 43 of the
ample, as that disclosed by the U.S. Patent Sprague et a1.
spring 41 is turned outwardly to extend through an open
2,586,734.
ing in a housing 44 which may selectively be permitted
The switch 69 is provided with a pair of contacts 71
to rotate freely or to be locked from rotation.
It is obvious that if the end43 of spring 41 is sta
and 72 and a terminal 73, the latter being connected to
the conductor 70. When the motor shaft is stationary
tionary that the spring 41 will unwind from about bush
the terminal 73 is connected to the contacts 71 and 72
ing 39 and there will be no driving connection between
by spring arms 74 and 75 biased into contact with con—
spring 41 and bushing 39.
tacts 71 and 72.
Referring to FIG. 3 a cap 47 is freely rotatable rela 20
In the Sprague et al. arrangement a sleeve is slidably
tive to the shaft 17 by ‘a bushing 45 (FIG. 4) and a lever
mounted on the motor shaft and is spring biased against
48 is pivoted to the cap 47 at 49. The lever 48 includes
the end of a pivoted lever which holds a pair of spring
a tab 50 which is adapted to be moved upwardly into the
contacts closed against a pair of ?xed contacts.
path of rotary movement of a lug 51 extending outwardly
When the motor is started to rotate in one direction or
from the housing 44.
25 the other and as it speeds up the sleeve is moved away
When the lever 48 is in the position shown in FIG. 3,
from the end of the arm by a centrifugal arrangement in
the housing is free to rotate and the spring 41 will drive
a direction to permit the spring contacts to move away
the shaft 17 counterclockwise.
from the ?xed contacts.
When the lever 48 is pulled upwardly by energization
Each one of the pair of ?xed contacts is connected to
of solenoid 53 the tab 50 will move into the path of ro 30 the contacts of a reversing switch and to the running
tation of lug 51 to prevent rotation of the housing 44 and
windings of a reversible motor. Thus one of the pairs of
the spring 41 will unwind and the agitator 16 will not be
contacts controls the motor in one direction of rotation
positively rotated but will follow the rotation of the
and the other pair controls the motor in the other direc
basket.
tion of rotation.
When the drive is reversed for a spin extracting oper
As the sleeve begins to rotate it will move the free end
ation the spring 41 tends to unwind from bushing 39 so
of the lever sideward so that only the contacts on the
that there is no positive drive for the impeller 16. Dur
leading side will be opened and those on the trailing side
ing such action the frictional drag of spring 41, the fric
will remain closed.
tional drag of the bearings for the impeller shaft as well
Thus, the starting winding of the motor remains in cir
as the frictional drag of the clothing in the basket on 4.0 cuit with the reversing switch through the trailing con
the impeller 16 all tend to rotate the impeller 16 with the
tact of the centrifugal switch. When the reversing switch
basket, which is proper as such rotation will not inter
is operated the starting windings are energized reversely
fere with the proper positioning of the clothing in the
and act as a brake to quickly stop the motor and start it
basket 16 for a spin extraction operation.
in the opposite direction.
If, however, the solenoid 53 is energized during a spin 45
FIG. 5 does not show all of the details of the centrifu
extraction operation, housing 44 is brought to rest and
gal switch 69 but the spring arms 74 and 75 are held in
the spring 41 is also brought .to rest and its frictional
contact with contacts 71 and 72 when the motor is idle.
drag on bushing 39 tends to hold the impeller 16 sta
As shown in FIG. 5 and asviewed from the right of
tionary.
the centrifugal switch 69 the motor is up to speed and
50
Under such conditions one of two things will happen.
rotating clockwise. The centrifugal switch 69 has opened
The impeller 16 will not rotate with the basket 15 which
is undesirable or the frictional drag of the clothing will
contacts 71 and the motor is operating normally in a
clockwise direction as described. As will appear that is
rotate the impeller despite the frictional drag of the
the washing position of the control.
spring 41 which is liable to heat up under the high fric
The reversing switch 76 is provided with ?ve contacts,
tional heat developed and render the spring 41 inoper 55 77, 78, 79, 89 and 81, and two switch arms 82 and 83
ative.
which move together as a unit.
The control arrangement of FIG. 5 is provided to pre
The contacts 79 and 81 are connected to contacts 71
vent such a contingency.
and 72 respectively of the centrifugal switch 69 by con
A reversible motor 54 is secured to the lower part of
ductors 84 and 35 respectively, the contacts 77 and 78
are connected to the bus bars 65 and 66 respectively by
For washing operations, in which the clothes basket
conductors 86 and 87, the contact 80 is connected to
15 is rotated slowly for tumbling washing operations,
one side of the condenser 64 by conductors 88 and 89
and to one side of the solenoid 53 by conductors 88
the basket 15 is driven clockwise, at a slow speed, by the
pulley 32 and for spin extracting operations it is driven
and 90.
65
in the same direction, at a high speed, by pulley 33.
The other side of solenoid 53 is connected to bus bar
One end of the motor shaft is directly connected to
65 by conductor 91 and a pair of parallel connected
drive pulley '33 at a high speed by means of a belt 56 sur
normally open switches 92 and 93.
the tub 14 in any suitable manner.
rounding the pulleys 55 and 33.
Th other end of the motor shaft is connected to drive
The entire circuit is adapted to be closed by closure
of the main switch 94.
pulley ‘32 at a low speed and in a reverse direction by 70
In the position shown in FIG. 5 the main switch 94
gearing 59, pulley ‘60 and belt 61. Thus the pulleys 32
is closed and the switch arms 82 and 83 are in their full
and 33 are always rotating in the reverse direction and at
line position connecting contacts 77 and 79 and 78 and 80
different speeds.
respectively.
The remainder of the driving arrangement for the im
The main winding 62 is closed across the bus bars 65
peller 16 and basket 15 has been previously described. 75 and 66, the centrifugal switch 69 has opened contacts
3,058,329
6
5
71, 74, the starting windings 63, 64- are open circuited
Thus even though one of the switches 92 or 93 should
and the motor 54 is rotating clockwise as viewed from
be inadvertently closed, the solenoid 53 would not be
energized to stop rotation of spring 41 and the improper
operation of the machine during spin extraction opera
the right which is the correct direction for rotating the
basket 15 at a slow speed by pulley 32. Pulley 33 is
overrunning and driving the spring clutch 41 which drives
tions.
From the foregoing it can be seen that the present
invention provides a simple control for a washer-extrac
the impeller 16 at a high speed in a direction reverse to
that of the basket 15.
tor unit which prevents improper operation thereof dur
If the program control calls for periods where the
ing spin extraction operations.
impeller should not be in operation or impeller rotation
While I have shown and described but a single em
is unwanted either of the switches 92 or 93 is closed to 10
bodiment of my invention, it is to be understood that
energize the solenoid 53 via conductor 87, contact 78,
that embodiment is to be taken as illustrative only and
arm 83, contact 89, conductors 8S and 90‘, the solenoid
not in a limiting sense. I do not Wish to be limited to
coil, switch 92 or 93 and conductor 91.
the particular structure shown and described but wish to
Energization of the solenoid 53 will thus stop counter
rotation of the impeller 16 and the washing tumbling 15 include all equivalent variations thereof except as limited
by the scope of the claims.
will continue without agitation.
I claim:
During certain operations of a washing program, for
example when the tub is being emptied, it is undesirable
that the impeller 16 should be in operation. In such
1. In a washer extractor, a rotatable basket, an im
peller rotatably mounted in said basket, means for rotat
ing said basket at a slow speed for washing operations,
means for rotating said impeller at a high speed in an
case the program control will close switch 92 to energize
solenoid 53 and rotation of the housing 44 will stop.
That will cause the spring clutch 41 to unwind and no
rotation will be imparted to the impeller 16.
opposite direction during slow speed rotation of said
basket, selective means for rendering said impeller rotat
ing means operative and inoperative, means for rotating
Under such conditions the impeller 16 will follow the
rotation of the basket 15, due to contact between the 25 said basket at a high speed for spin extracting operations,
that improvement which comprises means preventing
impeller 16 and the clothing in basket 15.
operation of said selective means during high speed rota
If the operation of the impeller is unwanted for any
tion of said basket.
washing program, such as when washing delicate fabrics,
2. In a washer extractor according to claim 1 in which
the switch 93 will be closed to energize the solenoid 53
and stop rotation of the impeller in the same manner.
30 said impeller rotating means includes an overrunning
clutch which imposes a frictional drag on the rotation
Thus the control of the energization of the solenoid
of said impeller when rendered inoperative.
53 renders the operation of the impeller selective during
3. In a washer-extractor according to claim 1 in which
the tumble washing operations.
said selective means is solenoid actuated, and said pre
After the washing operation is completed, the arms 82
and 83 of the reversing switch 76 are moved to their 35 venting means includes means preventing actuation of
said solenoid.
dotted line position of FIG. 5, while the motor 54 is still
4. In a washer-extractor according to claim 3 in which
rotating clockwise as viewed from the right in FIG. 5.
said preventing means comprises means for open circuit
The starting windings 63, 64 of the motor are placed
ing said solenoid to prevent actuation of said selective
in circuit via conductor 87, contact 78, arm 83, contact
81, conductor 85, contacts '72, 75, terminal 73, conduc 40
tor 7i}, windings 63, 64, conductors 89, 88, contact 80,
arm 82, contact 77 and conductor 86.
The starting winding 63, 64 will act as a brake on
means.
5. In a washer-extractor, a rotatable basket including
a shaft for rotating said basket, means for rotating said
basket shaft including low speed and high speed over
running drive members on said shaft which overrun in
motor to quickly stop its rotation in a clockwise direction
the same direction of rotation, means for rotating said
and bring it up to speed in a counterclockwise direction
to rotate the basket 15 at a high spin extraction speed. 45 members in opposite directions and at different speeds
so that when one is overrunning the other is driving said
As the motor comes up to speed the centrifugal switch
shaft, said slow speed drive member being operative to
69 will open contacts 72, 75 to cut the starting windings
rotate said basket at a slow speed when driven in one
63, 64 out of circuit and close contacts 74, 71 ready
direction While said high speed member freewheels at
for the succeeding motor reversal, the line being open at
contact 79 of the reversing switch 76.
‘
50
high speed in the opposite direction, a rotatable impeller,
means including an overrunning clutch operable to drive
During such reverse rotation of the motor 54, the
basket 15 is being rotated at a high speed in a clockwise
said impeller from said high speed drive member while
it
is rotating in said opposite direction, selective means
direction by pulley 33 while pulley 32 is freewheeling.
for rendering said overrunning clutch selectively oper
The spring clutch 41 is rotating clockwise in a direc
tion to unwind the spring from about bushings 37 and 39 55 able or inoperable during the slow speed rotation of
said basket, means for reversing the direction of rotation
and no rotation will be transmitted to the impeller 16.
of said members whereby said basket is rotated at a
However, the frictional drag of the spring 41 on the
high speed in the same direction by said high speed drive
bushing 39 tends to rotate the impeller 16 at the same
member and said slow speed drive member overruns,
speed as the basket 15 as do the clothes in the basket
60 that improvement which comprises means'for rendering
15 engaging the impeller 16. That is a proper operation
said selective means inoperative during high speed ro
and as it should be as it prevents interference with the
tation of said basket.
proper distribution of the clothes in the basket for spin
6. In a washer-extractor according to claim 5 in which
extracting operations.
Under such conditions, should the solenoid 53 be ener
gized, rotation of the spring will be stopped and its fric
tional drag will tend to prevent rotation of the impeller
16 with the basket 15. As previously pointed out, such
a condition is an improper operation of the machine and
may cause damage to it.
According to the present invention and referring to
FIG. 5, it will be noted that the circuit through the sole
said overruning clutch between said high speed driving
65 member and said impeller is of the coiled spring type
which contracts about drive and driven bushings to ro
tate said impeller and in which said selective means com—
prises means for holding the driven end of said spring
against rotation to cause said spring to unwind from
70 about said bushings to render it inoperative to drive said
impeller.
References Cited in the ?le of this patent
UNITED STATES PATENTS
noid coil 53 is open circuited at the contact 80 of the
reversing switch 76 when the arms 82 and 83 are in
their dotted line reversing position.
75
2,968,174
Bell et a1. ____________ __ Jan. 17, 1961
Документ
Категория
Без категории
Просмотров
0
Размер файла
649 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа