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Патент USA US3100035

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Aug.‘ 6, 1963
3,100,030
S. L. MCMILLAN
BRAKE MECHANISM FOR WASHING MACHINE
Filed 001;. 50, 1961
3 Sheets-Sheet l
a
I,- 23
r
,g,,__l2
INVENTOR.
STEPHEN L. MCMILLAN
I00
ATTORNEY
Aug. 6, 1963
s. L. MCMILLAN
3,100,030
BRAKE MECHANISM FOR WASHING MACHINE
Filed Oct. 50, 1961
3 Sheets-Sheet 2
AGITATE
5_2
INVENTOR.
STEPHEN L. MCMILLAN
54
\51
A
32
BY
ATTORNEY
Aug. 6, 1963
s. L. MCMILLAN
3,100,030 '
BRAKE MECHANISM FOR WASHING MACHINE
Filed Oct. 30, 1961
3 Sheets-Sheet 3
SPIN
‘
360°
210 °
H4
/
02
||_o
FIG. 7
I20
INVENTOR.
STEPHEN L. McMlLLAN
BY
ATTORNEY
United States Patent 0 ”
1
3,109,030
BRAKE MECHANISM FOR WASHING MACHH‘JE
Stephen L. McMillan, Wheaten, £11., assignor to General
Electric Qompany, a corporation of New York
Filed Oct. 30, 1961, Ser. No. 148,616
6 Claims. (61. res-6s)
3,100,030
Patented Aug. 6, 1963
2
there is a cam surface along which the latch mechanism
must be conducted for a ?nite length of time before
engagement is made with a portion of the housing. As
this engagement is e?ected, the brake band rotation is
stopped and the spin tub is decelerated.
The latch mechanism is normally biased toward the
plane of the initial contact area and cannot establish other
The present invention relates to brake mechanisms
than surface contact with the brake housing at any other
and more particularly to brake mechanisms for use on
angular position of the brake housing. This contact once
clothes washing machines.
It is generally known that with washing machines
established, is continued for over one half a revolution
which operate on the principle of utilizing an inner ver
tical shaft for oscillating a centerpost agitator and an
outer coaxial tubular shaft for rotating the spin basket,
the basket has a tendency to oscillate sympathetically
ing brake arm is made. It is a feature of the invention
that the brake arm is not in the plane of the contact area,
and can only be reached by the travel of the latch along
the cam surface. Thus, with a ‘brake mechanism embody
during agitation, a tendency Which disrupts the normal
ing the present invention, there is always a delay between
before the latching engagement with a radially extend
the time of initial contact of the latch and the brake and
wash patterns. Various forms of mechanisms have been
the start of the braking action. By providing this time
used to combat this tendency such as one-way spring
interval, it is ensured that the abrupt engagement which
clutches and solenoid-operated latching brakes. ‘Of these
mechanisms, the last-mentioned type has an inherent 20 occurs at the start of braking happens only when a posi
tive contact has been effected and ensured between the
advantage in that it effects a second and equally impor
latch and the brake band housing portion.
tant function, namely, that of stopping the basket rota
To e?‘ectuate this two-step brake engagement, the pres
tion in a matter of seconds on occurrence of conditions
ent invention utilizes a braking structure which includes
such as de-energization of the motor. Such de-energiza
tion of the motor may be due to the termination of the 25 a cylindrical brake band and outer housing about the
spin shaft. Within the housing there is provided a latch
spin period, may be due to the operation of safety switches
contacting area of limited angular length extend-ing along
incident to the lid of the machine having been opened,
the housing. From this area of contact, an acclivitous
or may be due to the basket having gyrated excessively.
cam surface traverses the brake housing angularly ‘for
In any event, it is most important that the spin basket be
braked and stopped rapidly, this being of special urgency
180° or more and terminates at a radial stop member
the rotating housing structure encompassing the brake
FIG. ‘6 is a side sectional elevation of the second em
spaced angularly and axially from the area of original
where the triggering condition was the opening of the lid
contact. The stationary latch member is normally biased
by the user, in that the person opening the lid may intend
in the horizontal plane at the level of the contact area
to reach into the basket. This is a potentially dangerous
situation, and an ef?cient basket braking mechanism is 35 so that when the latch member is impelled toward the
brake housing it can only contact the housing in the
an effective protection against bodily harm.
contact area. The member will enter the area and will
In any event, when the motor is de-energized, a posi—
slide along the cam surface as the housing continues its
tive acting brake will quickly decelerate the basket and
rotation for a ?nite time period. At the end of the
will hold the basket stationary at all times other than
motor-spin periods. It is to improvements in this type 40 period of positive con-tact the member engages said ra
dially extending stop member to actuate the brake band
of positive acting brakes that the present invention is
bringing the braking structure to a stop and thus initiat—
directed.
ing the braking action between the brake band and the
With braking action of the type required, contact must
spin shaft.
be made between a stationary actuating mechanism and
It is therefore an object of the invention to provide
a braking device which is rotated with the spin basket
an improved positive-acting, braking mechanism for a
but capable of rotation relative thereto. This contact
rotating clothes washing machine basket.
must be transmuted into a relationship with the braking
It is a further object of the invention to provide a
device (for example, a housing structure having an inter
brake mechanism which attains an initial contact between
nally arranged brake band) which will cause the braking
a stationary member and a rotating brake member at
device to come to an immediate stop relative to the rotat
only one period in the rotation of the brake and eifec-ts
ing basket and initiate the braking action to decelerate the
the brwng action a ?nite period of time thereafter.
rapidly rotating, high-inertia spin basket. The problems
Other objects, features and advantages of the inven
which result from this braking action are numerous. First,
tion will be apparent from the detailed ‘description of
the stationary mechanism must latch into the rotating
braking device on one rotation of the spin basket. With 55 the presently preferred embodiments thereof, read in con
nection with the accompanying drawings in which:
the basket rotating at a high speed, the possibility of losing
FIG. 1 is a partially sectioned side elevational view
the contact between the parts with consequent abrasion
of a washing machine employing the invention;
of the parts on one another is quite great. Following
FIG. 2. is a top plan View partially in section of a ?rst
the lost contact, further contact must be made rapidly in
order to initiate the braking action. Further, once the 60 embodiment of the braking mechanism of FIG. 1;
FIG. 3 is a side elevational view of the ?rst embodi
contact has been made, the high inertia of the rotor may
ment of the brake mechanism of FIG. 2;
tend to develop excessive strains in the latching members
FIG. 4 is a side sectional elevation viewed along the
in attempting to halt the rotation of the device in too
lines 4-4 of ‘FIG. 2;
short a period of time. The present invention alleviates
FIG. 5 is a top plan view partially in section of a second
these difficulties by providing a stationary actuating mem 65
embodiment of brake mechanism;
ber which seeks to establish a latching relationship with
bodiment viewed along lines 6—6 of FIG. 5;
band. The brake housing however o?ers only one area
FIG. 7 is a cam development chart of the cam surface
of limited angular extent where initial contact between
the latch mechanism and brake band housing can be made. 70 of the second embodiment;
FIG. 8 is a side elevation of the latch arm as used
This initial contact is not an engaging contact in which
the brake housing is attempted to be stopped. Instead,
in the second embodiment; and
3,100,030
3
4
FIG. 9 is a schematic wiring diagram applying my
tures or slots 47 for centrifugally ejecting water from
the basket. At the center of the spin basket there is po
sitioned a vertical agitator 48' which is mounted coaxially
on the agitator shaft 45 and is oscillated thereby. Also
mounted coaxially to the agitator shaft is a tubular spin
shaft 49 whose upper end terminates a few inches above
principle of operation.
Referring now to ‘FIG. 1 of the drawings, the clothes
washing machine 10 there illustrated, is of the generally
known spin-basket type. More particularly, the machine
10 comprises a substantially rectangular base 11 that is
supported upon independently adjustable feet 12 arranged
to engage the ?oor or other supporting surface.
the spin basket lower surface. This spin shaft is used
An
to impart rotative motion to the basket and to further
enclosing housing or other casing 13 is removably car
this end, the spin shaft is ?rmly secured to the spin
tub 46 at hub 49.1. The lower end of spin shaft 49 is
mounted securely to the upper surface of transmission
ried by the base 11 and includes a conventional wrap
around element including front, side and top walls. The
sides of the top wall 15 are substantially flush with the
side walls of housing 13 to ‘form an upright substantially
rectangular prism. At the rear of the top wall 15 is
mounted a slightly vertically extending backsplasher 16
which serves as a control panel.
The inner portion of
housing v32 so that the spin shaft and basket are co
rotative with the transmission housing 32. Exteriorly of
the cylindrical body of the agitator 48 are positioned a
15
plurality of radially extending agitator vanes 50. The
agitator is further provided with an outwardly and down
this baoksplasher contains the control mechanisms and
switches (shown only as rectangle 16.1 for initiating a
cycle of the proper length and type. Purely by way of
simpli?ed example, there is shown a timer control knob
17 which is rotatable manually to set the desired length
of the operative cycle.
Wardly flared skirt '51 to which the vanes 50 are joined
at their lower ends.
Turning now to the drive mechanism, there is pro
vided as previously mentioned, a main drive motor 36.
The motor comprises a reversible induction motor of the
A substantially centrally disposed stop opening .20 is
but for simplicity will be described herein as a single
speed motor. The motor, a typical appliance motor, has
a rating of about 1/3 horse power and an operating speed
at full load of about 1,725 rpm. The motor, ingen
provided in top wall 15 in order to render the interior
of the housing 13 accessible. A conventional lid 21 is
provided for the purposes of selectively closing the top
opening 20'; the lid being hinged to top Wall 15 at its
rear edge and movable thereabout from a closed posi
tion to an open position allowing access to the interior
split-phase type which may be of the two-speed type,
erally known fashion, may be energized through select
able circuitry for rotation in the clockwise or counter
clockwise direction to effectuate the necessary agitate and
of the casing 13 for loading or unloading the machine.
30 spin operations.
A generally rectangular collection chamber or drain
In FIGS. 2, 3 and 4 there is shown a ?rst embodiment
tub 23 is provided in the upper portion of housing 13.
of a brake mechanism employing ‘my invention. This
The bottom wall 26 of chamber 23 is welded or other
brake mechanism includes a rotational brake housing 52
wise suitably sealed to the inner wall of the housing,
which con?nes a brake hand, later described. The hous
and spaced above base 11 to de?ne a machinery com 35 ing structure is mounted on the transmission casing 32
partment 27 arranged in the lower portion of housing
in the area above the upper exposed surface 54 of the
13. Within this compartment there is provided a sup—
casing. The casing includes a cylindrical vertical exten
port structure 29 which serves as the foundation for the
sion 55 protrusive above the exposed surface. This ex
vtransmission and this support is mounted to base 11.
tension in turn is secured in any suitable fashion to the
This support structure 29 comprises a horizontal base 40 spin shaft 49 so that both structures rotate simultane
plate 30, vertical side walls 31 extending therefrom to
ously. Within this extension 55 there is provided a
join a top plate 31.1 in forming an open rectangular
shoulder 56 on which rests a metal bearing washer 57.
mounting space for the transmission mechanism 32. Se
This Washer serves as a mounting base for the rotational
cured to one side wall 31 is a curved channel member
mechanismv 52. The housing ‘52 comprises an irregular
35 to- which is bolted or affixed in any known manner
the main drive motor 36.
Motor 36 is positioned in
inverted fashion with its output shaft 3-6.1 depending
cylinder of metal such as steel with various indented
areas forming cam surfaces therein. First, there is a
low horizontal platform 64 of short radial depth as de-v
?ned by the upstanding wall 62. As apparent from FIG.
2, wall 62 spirals inwardly in opposition to the direction
erally known type. The pump may preferedly have its
of rotation of shaft 49 during the spin operation. The
impeller ‘fastened to the motor shaft so that the pump 50 area above the platform and outwardly of wall ‘62 con
may expel waste water on rotation of the motor. Fur
st1tutes an opening in the brake housing. From a point
ther, the vmotor shaft has mounted to it a pulley 37
(a) FIG. 2, which de?nes the limits of platform 64,
from the motor structure. Secured about the motor shaft
is a coupling to a drain pump- (not shown) of any gen
which carries a ?exible V belt 3-8.
This V belt is also
an inclined plane or ramp 66 spirals upwardly for an
laced about large diameter pulley 39 of the transmission
angular distance, of 270° more or less, and terminates
mechanism 32, to impart a reduced speed driving eifect 55 in a vertically and outwardly extending terminal wall
thereto. The transmission mechanism 32 is mounted in
68. This terminal wall extends radially from intermedi
parallel relationship to the motor 36 and has extending
ate wall 62 to the peripheral wall 69 of the structure 52,
upwardly above its topmost surface a central agitator
By this construction, the terminal wall 68 is angularly
shaft '45 which in its upward extent protrudes through
and axially spaced from the platform 64 through the
60
the bearing retainer structure and into the collection
medium of the inclined plane ‘66 so that the approach to
chamber 23.
‘wall '68 from the plane of platform 64 is along the in
An upstanding spin basket 46 is centrally positioned
elined ramp 66. Fitted into the cylindrical brake hous
ing is a metal brake band 70* which ?ts tightly against
tion about a substantially vertical axis. The spin basket 65 the inner wall 71 of the housing. This brake band in
is generally imperforate and has an open face adjacent
cludes a tang 72 extending radially from the band proper,
the top access opening of the casing 13 to allow access
and positioned within a suitable notched area 73 within
to the basket interior. About the periphery of the basket
the wall structure 74 of the brake housing. Also within
adjacent the open face, there is secured an annular bal
the notched area 73, there is positioned adjacent the tang
ance ring 46.1 of high density material providing a
72 a suitable rubber cushion 75. Cushion 75, by virtue
comparatively large moment of inertia for the basket. 70 of its position, will absorb a large portion of any shocks
The spin basket 46, is provided with an upwardly and
transmitted to either of these members. Bonded to the
outwardly ?ared sidewall that terminates as mentioned
inner surface of brake band 70 is a brake lining 76 which
below the access opening. Near its upper periphery
optimally is constructed of friction material suitable for
basket 46 contains a horizontally aligned series of aper 75 use in braking high inertia devices. This brake lining is
within collection chamber 23 and is mounted for rota
3,100,030
5
6
bonded to the interior of the band in such a manner
tendency toward sympathetic spin and oscillation on the
transmission casing. 011 machines which utilize no posi
tive braking apparatus, the transmission casing tends to
that it ?ts tightly about the casing extension 55 so that
the housing 5.2 will rotate with the casing and spin shaft
49 when the brake mechanism is maintained inactive,
and the brake band will impose a considerable braking
force when the brake mechanism is activated.
Adjacent the brake housing 52 there is mounted as
move with an action which can best be described as
oscillation superimposed on rotation, a speed which may
reach 13-‘15 rpm. This movement on such machines
is transmitted through the spin shaft to the spin basket.
The basket then describes this oscillatory rotation which
ber ‘80 which extends horizontally and tangentially to
ends to impede the normal wash action and may also
ward the brake housing. A detent 82 extends radially 10 cause damage to the laundry in the basket.
toward the brake housing to enter into a latching relation
During the agitate cycle on the present machine as
ship therewith, as presently explained. The latch member
equipped with 1a positive brake mechanism, the function
is pivotally mounted at the end most remote from de
of the brake mechanism ‘during the agitate cycle is to
tent 82. The pivotal mounting is accomplished by means
hold the spin basket substantially stationary while the
of a pivot rod 34 depending from the stationary trans 15 centerpost agitator oscillates. What is considered sub
mission support 311. About this rod there is mounted
stantially stationary is rotation on the order of 4 rpm.
for free rotation a tubular bushing 86. At the bottom
or less. In the agitate cycle, solenoid 92 remains de
end of bushing 86 there is an annular ?ange 87 on which
energized and latch 80 maintains its position under the
part of the total brake mechanism structure, a latch mem
the latch member 85} rides. The ?ange rests freely on an
expanded head of rod 84 and the ?ange and bushing are
movable vertically on rod 84. A torsion spring 88 is
coiled about the bushing and has ‘one spring end 88.1 an
chored to ‘a stationary mounting member 38.2‘. The op
normal urging of torsion spring 83-. Torsion spring ‘88,
top bearing washer 94 which rests on the top of the cas
and pulley system previously ‘described and as a result
as previously mentioned, biases latch 80‘ toward the brake
housing so that detent 812 is prepared for locking engage
ment therewith. If transmission casing 32 oscillates, and
more particularly ‘during the clockwise portion of the
posite or lower end of the torsion spring ‘88.3 is looped
oscillatory movement, detent 82 will slidingly contact
about the latch member to bias the latch member to 25 plat-form 64 and will slide into engagement with groove
ward the brake housing. The spring also biases the latch
86 (as shown in FIG. 2). With this engagement, the
member toward its ?ange 87. With this torsion spring
brake mechanism will be anchored to the latch and the
and the mounting of bushing 86 on pivot rod 84, a limited
engagement of the brake band with the extension 55 will
amount of vertical travel of the bushing and its attendant
resist a large proportion of the attempt at rotation or os
latch member is permitted. At the detent end of the latch 30 ci-llation.
member there is connected a tension spring 90‘ which nor
As the control mechanism drives the machine elements
mally is inactive and allows the detent to respond to the
into the extract or spin operation by suitable circuitry
urging of the torsion spring 88 and remain in the posi
(not shown), solenoid 92 will be energized and will draw
tion shown in FTGS. 2. and 3. The remote end of the
its plunger in the direction away from the brake housing.
tension spring 91) is a?ixed to the plunger 91 of a suit-.
This plunger movement will draw latch member 80‘ away
able electrically operated solenoid 92. Thus, when sole
‘from the brake mechanism. This plunger movement will
noid 92. is energized drawing plunger 91 into the solenoid
overcome the contrary urging of torsion spring '88- and
proper, the tension spring 90 is activated and overcomes
will draw the latching ydetent '82 out of groove 96. The
the normal urging of torsion spring 88 and Ias a result
detent will thereby be held in a position out of engage
40 ment with the brake mechanism as long as solenoid 92
will draw detent 82 away from the brake housing.
To complete the structural description of the brake
remains energized. In the spin cycle the drive motor 36
will rotate the gear transmission casing through the belt
mechanism, as a further component there is provided a
ing extension '55 and serves to axially position the brake
casing 32 will rotate in the counterclockwise direction as
housing 52 with respect to the transmission casing while 45 viewed in FIG. 2. The latch mechanism having been
permitting one to rotate relative to the other. The brake
withdrawn from engagement with the brake mechanism,
housing wall 62 is provided with a vertically extending
no impediments to rotation are encountered in the path
groove 96 which extends axially from the plane of plat
of travel of the brake mechanism. Gear casing 32 rotates
form 64 to the top of the brake housing. This groove
and in turn rotates spin shaft 49‘ and spin basket 46 to
extends radially inwardly from the platform wall sub 50 extract liquid from the tub at a high rate of speed.
This unimpeded rotation continues until one of a num
stantially to the brake band. The groove is recessed to
a width and depth su?icient to receive vdetent 82 in a
ber of conditions occurs. One of these conditions may be
manner ?rmly locking the brake mechanism to the latch
member.
The Washing machine shown herein is of the conven
the conclusion of the time allotted within the sequence for
the extraction operation. Several makes of washing ma
chines in present manufacture have ‘a main power switch
such as 98, FIG. 1, which is held closed by the weight of
the machine lid 21. ‘In such machines, a second condi
tion which may occur is that of the machine lid having
been opened. An emergency condition may include ex
cess gyra-tion of the basket actuating a shut-off mecha
nism. This arrangement, also, is well ‘known in the art.
Following any of these occurrences, the spin basket ro
tation should be terminated rapidly. To effect this stop
tional type which through suitable control mechanisms
governs the sequencing through a wash cycle which in
cludes a wash ?ll, a wash ‘agitation period and extraction
period followed by one or more rinsing cycles. Each
rinsing cycle will, of course, consist of a rinse till, a rinse
agitate period and a rinse extract period.
To fully analyze the operation of the brake mechanism
of the present invention, it is only necessary to view the
operation during an agitate period and the subsequent
page of rotation, suitable generally known electrical
extraction period, the other agitate and spin periods being 65 switches are actuated opening the energizing circuit to
identical for the purposes of this invention. 'No'w view
ing speci?cally the functioning of this embodiment dur
ing a washing machine operation, it will be assumed that,
after the preliminary steps the control mechanism has
solenoid 92.
The circuitry shown in FIG. 9 is schematic, for all
the necessary components are old land well known.
Timer~driver cam 10% is of the three-level type, in which
sequentially actuated the suitable components into an 70 the lowest level closes cam follower 101 against contact
agitating cycle. During an agitate cycle the drive motor
102 to energize the reversible motor 36 in its spin direc
36 is imparting a clockwise (as viewed in FIG. 2) rota
tion; the upper cam level closes the follower against con
tive force to the gear mechanism and as a result agitator
tact 103 to energize the motor in its agitate direction;
shaft 45 is oscillated within the spin tube 49. The clock
and the intermediate level establishes an open circuit con
wise rotative force on the gear mechanism imparts a 75 dition. It will be apparent that when the motor is in
3,100,030
7
spin condition, an open lid switch 98 will deenergize the
motor and the solenoid 92. The lid switch has no such
control when the motor is in agitate condition. When the
cam 100 runs out the spin cycle ‘and restores follower 101
to its intermediate level, both the motor and solenoid are
strike the periphery 69 of the housing, which in this area
is higher than the plane of operation of the latch 80. The
detent will thus be restrained outwardly of the housing
until platform 64 has rotated to a position adjacent the
latch detent for contact therewith.
As mentioned pre
deenergized. When solenoid 92 is deenergized, latch 80
viously, within the area of platform 64 detent 82 will enter
is under the control of torsion spring 83, which impels
the brake housing to contact wall 62. Slide motion of
latch 80 in the direction toward the brake mechanism,
the latch up the ramp will follow leading to the brake
detent 82 then assuming a position adjacent brake hous
action engagement. By this construction, it is ensured
ing ‘62. The brake housing, it must be remembered, is 10 that there is a contact of over 180° of revolution between
rotating in a counterclockwise direction during this high
the brake mechanism and latch before the braking engage—
speed extraction rotation. Further, it should be ‘remem
ment between detent 82 and radial terminating wall 68 is
bered that torsion spring 88 tends to maintain latch 80
reached to initiate the braking action.
and detent ‘82 in a horizontal plane substantially as shown
A second embodiment of the brake mechanism is shown
in FIG. 3. In this horizontal plane detent 82 is posi 15 in FIGS. 5—8 inclusive. The brake mechanism is quite
tioned axially just above the level of platform 64. As
similar to the prior embodiment generally and is mounted
detent 82 approaches the brake housing, either of two
about gear casing extension 55a above and integral to
conditions may occur during a rotation of the brake hous
casing 32a. Casing 32, extension 55a, and spin tube 49a
ing. In ‘a ?rst of these conditions, ‘the area of upstand
are all ?rmly a?ixed to one another for rotation, as in
ing wall 69 may be found within the area to which the 20 the earlier described embodiment. On the shoulder of
latch detent is impelled. If this condition occurs, the de
the casing above exposed surface 54a of casing 32a, there
tent will strike the upstanding wall at its periphery, the
is mounted the brake housing 110 which may be described
as a cylinder with a sloping upper wall surface or ramp
detent will slightly rebound from the wall and rotation
surface 112, the development of which is shown in FIG.
will continue. As the brake housing continues through
the same revolution, the inertial effect of the latch mecha 25 7. Ramp 112 may be considered as a cam surface which
is radially level and extends from a low plane at line y114
nism having been de?ected outwardly by the rapidly ro
to a high line at ‘116. In one direction the ramp surface
tating outer wall 69 will tend to maintain the detent at
extends from line 114 to line 116 for a distance of 270°
the same radial distance from the drive shaft. This in
considered angularly, and in the other direction extends
ertial effect will be continued for a ?nite time period
after the outer wall '69 has completely passed the ‘detent. 30 90° from low to high. At the high position reached by
line ‘116, a radially extending tang 120 protrudes from an
This period is sufficient to cause the brake housing to
annular metal brake band 122 into a sized notch in the
have rotated groove 96 past the detent 82, alleviating the
inner edge of the upper surface at line 116. This tang
possibility of this engagement. As the brake mechanism
extends radially only partially to the outer periphery 124
continues its rotation, detent 82 will be biased radially in
wardly toward the center of the rotating assembly and 35 of the brake housing 110. The brake band is of generally
known incomplete tubular form as with the ?rst described
will encounter the open recessed area above platform 64.
embodiment. Bonded to the inside of the brake band is
In the area above the low platform 64, the detent will ?nd
little resistance to inward movement and will continue to
move inwardly until it strikes the inner wall ‘62 of ‘the
a brake lining 126 of suitable friction fabric which as in
the previous embodiment tightly encircles extension 5511
of the casing 32. -A positioning annular washer 127
and suitable snap ring ‘128 of extended vertical height may
brake housing. The rotation of the brake mechanism
continues and detent 82 will be guided upwardly along
be used as a spacer and to position the brake mechanism
the rotating inclined plane 66. As the detent rides along
relative to the extension 55a and stationary support 31a.
this ramp surface, it is allowed further inward movement
This snap ring extends vertically from the top surface of
by the spiral wall of housing ‘62. At rthe top of this in
the brake housing substantially to the stationary adja
clined ramp, detent 82 will ?nally be guided into engage
cent support 31a as can be seen best in FIG. 6. As in the
ment with the radially extending wall 68. The engage—
prior embodiment, the brake housing, brake band and
ment of the terminating wall and the latch detent immedi
lining rotate with the gear casing and spin tube on spin
ately arrests rotation of the brake housing and braking
rotation in the counterclockwise direction, when no im
force is transmitted ‘from radial wall 68 ‘through cushion
75 to tang 72 to band 70' and ultimately ‘through the 50 pediments to rotation are encountered.
To provide the latching impediment to rotation when
brake lining 76 to the transmission casing 32. It will
required, a latch arm 130 is pivotally secured to the adja
be evident that there is a slight relaxation of the brake
cent support wall 31a at a pivot rod 132. On either ver
band 70. This renders the braking action less abrupt,
tical side of the connection of latch arm 139 to the pivot
and reduces the shock load which would otherwise be
imposed on the casing 32. Nevertheless, the frictional 55 rod, there is provided a rubber bushing, namely, V134 and
136, which combine to allow the latch member a limited
engagement of brake lining 76 with extension ‘55 brings
amount of tilting movement in the vertical direction in
the casing 32 and its thereon mounted spin shaft to a
addition to the pivotal motion about rod 132. Latch
stop.
member 130 (seen in detail in FIG. 8) includes a stepped
Now turning back to the instant of engagement between
portion which horizontally spaces the mounting end 140
the latch and the brake mechanism, it should be noted that
from the latching end 142. Latching end 142 includes
the torsion spring 88 nominally maintains detent 82 in a
an inwardly concave section 144 which substantially
plane just above horizontal platform 64. When the con
matches with the circularity of the outer periphery of
tact between the detent and the wall 69 occurs in the area
brake drum 122. Further along this inner latch surface,
from groove 96 to radial line (a) approximately 90°
away, the detent will enter the platform indentation, will 65 in the direction toward its pivot axis, the latch end 142
is grooved at 146 with a recess large enough to seat tang
contact wall 62 and ride up the ramp. The slide action of
120. Recess 146 and concave section 144 are in the same
bushing 86 on the pivot rod .84 follows the guided move
horizontal plane within latch end 142. With latch arm
ment of the detent under the bias action of torsion spring
130 held horizontally, the plane of end i142 is at a lower
88 by sliding up pivot rod 184 and moving the plane of the
latch upin like amount until terminal wall 68 is encoun 70 level than that of the pivot end 140. At this lower end,
the latch arm 130 is biased toward the brake mechanism
tered' to initiate the braking action.
by a tension spring 150 anchored to any suitable stationary
If however, the preliminary contact between the latch
member such as an extension (not shown) of support 31a.
and the housing occurs in the angular area from line (a)
Acting in the direction opposed to spring 158, is a link
to the terminal wall '68, which in the example shown
in FIG. 2 encompasses about 225°, the detent 82 will 75 152 which is secured to the latch arm adjacent groove
3,100,030
10
$
146 and extends from the opposite side thereof. This
link is secured to the plunger .154 of solenoid 156 so that
energization of the plunger withdraws link 152 and latch
130 from possible contact with the brake mechanism.
Solenoid 156 may physically be secured in any known
fashion to the stationary structure 31a.
The operation of this embodiment is quite similar to
the mode of operation of the prior embodiment. During
the agitation portion of this cycle, transmission casing
320: is oscillated sympathetically with but little power 10
by oscillation of the center shaft 45a.
Solenoid 156v re
mains deenergized allowing spring 150 to advance the
latch 130 toward the brake mechanism. During the
oscillation of the casing 320, concave section ‘144 will at
some time reach low area 114 and be drawn against the 15
brake drum. With continuing oscillation, concave sec
tion 144 will ride up the slope 1-12, presumably up the
comparatively short 90° angular slope due to the prevail
ing clockwise rotation of the input to the transmission
biased toward said rotor in a plane perpendicular to
the rotational axis of said rotor whereby said brake
housing arrests further pivotal motion of said mem
ber and allows rotation of said rotor,
a recess of limited extent in said brake housing adjacent
the pivotal plane of said member for receiving said
member on pivoting thereof,
a cam surface spiralling about said housing from said
recess for conducting said member therealong on ro
tation of said rotor following receipt of said member,
a contact shoulder spaced angularly and axially about
said rotor from said recess,
said contact shoulder extending radially from said brake
housing at the end of said cam surface for stopping
the conducted motion of said member and engaging
said member, means on ‘said brake band responsive
to said engagement for actuating said brake band and
for latching to said member for stopping rotation of
said rotor.
2. A brake mechanism for a machine which includes a
and when the latch {arm reaches high line 116 on the cam 20
stationary support structure and a rotor mounted on said
surface, tang 120 will engage with recess 146 and latch
structure for rotation relative thereto, comprising:
the brake mechanism to arm 130. In actuality, this
a brake ‘band disposed about said rotor in frictional
action as described will occur infrequently as the latch
engagement therewith,
once having locked to the brake mechanism at the con
clusion of the last spin will maintain this engagement until
the start of the next spin operation.
With the start of spin, solenoid 156 is actuated, drawing
its plunger 154 inwardly and pulling link 152 to withdraw
the latch from the brake to allow unimpeded counterclock
wise rotation of the spin tube, gear casing and casing ex 30
tension. Solenoid :156 is held energized throughout the
spin cycle and is deenergized by a signal indicating the end
of spin period, unbalance, power loss, or by the opening
of the lid control switch circuit, any condition of which
signi?es that the basket rotation is to be halted. With 35
any one of these occurrences, solenoid 156 is deenergized
as the basket, transmission casing and spin tube continue
to rotate at high speed. Engaging end ‘142 of the latch is
released from the restraint imposed by the solenoid and
is biased by spring 150 toward the brake housing in the 40
plane adjacent the low spot 114 on the cam surface. At
all radial positions on the housing other than within a
small area on either side of low area 114, concave section
a housing about said brake band and engaging there
'with for conjoint rotation of said housing, brake band,
and rotor, said housing having a ramp spiralling up
wardly thereabout,
a latch member pivotally secured to said support struc—
ture,
means for biasing said latch member for rotation toward
said housing in a plane normal thereto and immedi
ately above the low point of said spiral ramp where
by said latch member may enter above said ramp only
at the low point thereof,
wall means extending radially of said ramp at the high
point thereof for engagement by said latch member
to interrupt rotation of said housing and brake band
and thereby effect deceleration of said rotor,
and means for disengaging said latch member from said
housing.
3. In a washing machine having a stationary frame
structure, a spin basket, and a motor for rotating said
basket, the combination comprising:
144- will strike the housing outer wall 124 and the rotation
a basket-rotating shaft adapted to be rotated by said
of the housing will continue. When the low section 114
in the continuing rotation reaches an angular position ad 45
motor,
a cylindrical brake housing disposed about said shaft for
jacent the latch end 142, concave surface 1-44 is allowed
rotation relative thereto,
to penetrate the housing area and strikes brake band 122.
a brake band ?xed within said housing extending about
After this initial contact has been made, rotation of the
said shaft in frictional engagement therewith, where
spin tube and brake housing continues as latch end 14-2
by said housing and said shaft may rotate concur
rides up the inclined plane 112. As the rotation continues, 50
rently,
tang 121} contacts the inset portion 160 of the latch 130.
a latch member having a nose portion extending toward
This contact of tang and inset leads the tang into latching
engagement with groove 146. The latching engagement
said housing,
locks the brake band 122 to the stationary structure
through the latch. This has the effect previously noted: 55
it slightly relaxes the brake lining 126 on the casing ex
tension 55a to brake the casing Without imposing an exces
sive shock load. Nevertheless, because of the frictional
engagement of the brake band lining 126* with extension
55a, the spin tube and the basket ‘come to a stop within 60
a matter of seconds.
This latch brake once engaged re
mains engaged until such time as solenoid 156' is ener
gized, during spin only.
While there has been described what is at present
thought to be the preferred embodiments of the invention, 65
it will be understood that various modi?cations may be
made therein, and it is the intention to cover all such
modi?cations as fall within the true scope of the invention.
What is claimed is:
1. A brake mechanism for a structure which includes 70
a stationary support and a rotor rotatable adjacent said
support, comprising:
a cylindrical brake housing and band circumposed about
said rotor,
a latching member pivotally secured to said support and
means providing a ramp about the exterior of said hous
ing, said ramp having a low point immediately below
the plane of said latch member and spiralling upward
ly about said housing to terminate in a radially extend
ing wall structure,
means for mounting said latch member for displacement
in a first plane normal to the axis of rotation of said
housing and in a second plane parallel thereto,
and means for effecting displacement of said latch
member in said ?rst-named plane to engage with said
housing in surface contact with said ramp, whereby
rotation of said housing relative to said latch member
ultimately effects engagement of said housing wall
structure with said latch member and consequent in
terruption of rotation of said housing and decelera
tion of said shaft.
4. In a washing machine having a stationary frame, a
spin basket, and a motor for rotating said basket, the
combination comprising:
a basket-rotating shaft adapted to be rotated by said
motor,
3,100,030
11
12
~ a brake supporting structure disposed about said shaft
and means for eifecting displacement of said latch
member in its said plane to engage the latch end
portion with said housing in surface contact with
for rotation relative thereto,
. a brake band- ?xed within said supporting structure ex
tending about said shaft in frictional engagement
therewith, whereby said brake band and said shaft
said ramp, whereby rotation of said housing relative
to said latch member ultimately effects engagement
of said brake band end wall with said latch mem
may rotate concurrently,
a latch member having an end portion extending to
her and consequent interruption of rotation of said
brake band and deceleration of said shaft.
ward said supporting structure,
means providing a ramp about the exterior of said sup
. ‘6. in a washing machine having a stationary ‘frame, a
porting structure, said ramp having a low point im
mediately below the plane of said latch member and
spin basket, and a motor operable in either forward or
reverse direction, the combination comprising:
a basket-rotating sharft adapted to be rotated by said
means at the top of said ramp engageable by said
motor,
latch member end portion to interrupt rotation of
a cylindrical brake housing disposed about said shaft
15
said brake band,
for rotation relative thereto,
means vfor mounting said latch member for displace
a brake band fixed within said housing extending about
ment in a plane normal to the, axis of rotation of
said shaft in frictional engagement therewith, where
said housing, said mounting means providing for
by said housing and said shaft may rotate concur
rently,
movement of said latch member end portion axially
20
of said supporting structure,
a latch lever having a nose portion extending toward
means ‘for e?ecting withdrawal of said latch member
said housing,
relative to said housing,
means providing a ramp on said housing, said ramp
and means ttor effecting displacement of said latch
having a low point immediately below the plane of
member in its said plane to engage the latch mem—
said latch lever and spiralling upwardly about said
ber end portion with said housing in surface con 25
housing to ‘terminate in a radially extending wall
spiralling upwardly about said supporting structure,
tact with said ramp, ‘whereby rotation of said hous
ing relative to said latch member ultimately bring
said end portion into operative association with said
brake hand to interrupt rotation thereof and effect
30
deceleration of said shaft.
5. In a washing machine having a stationary (frame, a
spin basket, and a motor for rotating said basket, the
ond plane substantially axially of said housing,
combination comprising:
a solenoid mechanically associated with said latch lever,
electric circuit means ‘for energizing said solenoid ‘to
withdraw said lever from said housing upon con
a basket-rotating shaft adapted to be rotated by said
motor,
a brake supporting structure disposed about said shaft
for rotation relative thereto,
a brake band :carried by said structure and encircling
said shaft in frictional engagement therewith, where
currently energizing said motor =for operation in one,
only, of said motor operating directions,
and spring means e?ective upon concurrent deenergiza
by said structure and said shaft may rotate con 40
currently,
a latch member having an end portion extending to
tion of said motor and solenoid to move said lever
to bring the nose thereof ‘for engagement with said
detent pocket or into overlying relation with said
ramp according to the angular displacement of said
ward said structure,
pocket relative to said nose at the time of such lever
.means providing a ramp on said structure, said ramp 45
having a low point immediately below the .plane of
said latch member and spiral-ling upwardly about
said structure, said brake band having a radially ex
tending end wall de?ning the uppermost end of said
ramp,
structure,
wall means providing a detent pocket in said housing
on the level of the low point of said ramp,
means 1for mounting said latch lever for displacement
of the nose portion thereof in a ?rst plane normal
.to the axis of rotation of said ‘housing and in a sec
7
supporting structure,
of rotation of said housing is represented by the time
required for said nose to traverse said ramp and
engage with the radial wall means de?ning the end
50
means for mounting said latch member on said frame
for displacement in a plane normal to the axis of '
rotation, said mounting means providing for move
ment of said latch member axially of said brake
means etfecting withdrawal of said latch member rela
tive to said structure,
movement, whereby maximum delay in interruption
thereof.
References Cited in the ?le of this patent
UNITED STATES PATENTS
279,033
962,141
1,788,110
2,807,951
2,946,409
Smith ________________ __ June 5,
Hartmann ___________ __ June 21,
Junghans ______________ __ Jan. 6,
Gerhardt et al. ________ __ Oct. 1,
1883
1910
1931
1957
Jennings _____________ __ July 26, 1960
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