Pop-out lint trap and door interlock for laundry apparatus

Pop-out lint trap and door interlock for laundry apparatus
United States Patent
[72] Inventor
Richard A. Elmy
Mansfield, Ohio
[21]
[22]
[45]
[ 73]
825,644
May 19, 1969
May 25, 1971
Westinghouse Electric Corporation
Pittsburgh, Pa.
Appl. No,
Filed
Patented
Assignee
[111 3,579,851
3,050,864
8/1962
Sasnett ....................... ..
34/45
Primary Examiner--Carroll B. Dority, .lr.
Attorneys-F. l-l. Henson, E. C. Arenz and B, B. Sklar, Jr.
[54] POP-OUT LINT TRAP AND DOOR INTERLOCK
FOR LAUNDRY APPARATUS
'
9 Claims, 5 Drawing Figs.
[52]
US. Cl ...................................................... ..
minder for clothes dryer apparatus which prevents uninten
34/82,
34/48
[5 1]
[50]
Int. Cl ....................................................... .. F26b 21/06
Field of Search .......................................... .. 34/45, 48,
55, 82
[56]
2,776,826
References Cited
UNITED STATES PATENTS
1/1957
Bennett et al ............... ..
7 ABSTRACT: A combination interlock and maintenance re
34/82X
tional restarting of the dryer after interruption thereof, prior
to the end of the cycle, and which reminds the operator to
keep the lint trap clean. The invention is characterized by a
lint ?lter located at the front of the dryer and operatively as
sociated with the access door thereof such that when the latter
is open the lint trap moves partially beyond the front wall of
the dryer to thereby remind the user that it should be cleaned.
Both the lint ?lter and the front door cooperate with circuit in
terrupt means such that both must be closed in order for the
apparatus to operate.
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3,579,851.
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POP-OUT LINT. TRAP AND DOOR INTERLOCK FOR
LAUNDRY APPARATUS
2
drop-down”
Attached totype.
the front
A switch
wall 12,
21, issee
a door
FIG.structure
2, is carried
19 ofby
thethe
'
front panel in such a position that it is actuated byv the door
BACKGROUND or THE lNVEN'IlON
structure, the switch being closed whenthe door is closed and
opened when the door is opened. The primary function of the
Most, if not all clothes dryers are provided with a door actu
ated switch which interrupts operation of the dryer. when the
door is opened. Such switches usually open the circuit to the
door, of course, is to provide access to the interior of a drum
basket, objects not intended to be placed therein. Subsequent
duct 23. The foregoing movement is automatically effected
when the door structure 19 is opened, as shown in phantom in
FIG. 2. This is accomplished through the disengagement of a
pair of lock springs 31 (only one shown) which frictionally en
or basket 22 which is supported by the rear wall 14, For rota
tion about a substantially horizontal axis. The basket is rotated
main motor, heater and timer motor. The reason for stopping
by means of a conventional motor and belt combination, not
the main motor is a matter of safety, i.e., to prevent the inser
10 shown, which motor also effects operation of air-circulating
tion of an arm into the path of a rotating drum. Deenergization
means, also not shown. The air-circulating means, in a con
of the heater prevents the overheating that would occur when
ventional manner, causes air to ?ow through the various parts
the main motor is stopped, since the motor also drives the fan
of the dryer including an air duct generally indicated at 23. _
which effects air circulation. Timer motor stoppage is desira
A lint trap structure 24, in the form of a drawer, is sup‘
ble since its function is only accomplished when timing clothes
ported for movement into and out of the duct 23 by a pair of
that are being dried, which is not the case when the heater is
guides 26 (FIG. 3) which receive a pair of sidewardly extend
off and the basket is stationary.
ing ?anges 27 (only one being shown) of the lint trap '24. :The
It will be appreciated from a consideration of the foregoing
lint trap is biased to move partially beyond a front wall or
arrangements that it is quite possible for the ‘dryer to be
panel 28 by a spring 29 mounted on the rear wall of the air
damaged by mischievous children who may place into the
closure of the door, in the case where time remains on the
timer (i.e. clothes have been removed by a housewife and the
timer has not been turned to the “off” position) will restart the
dryer. Moreover, the curious child may decide to climb into 25 gage ?ange 27 of the lint trap 24 (see FIG. 2). The'required
pressure is provided through the interaction of the underside
the basket and close the door, consequences of which are
quite apparent.
_
of the door structure abutting (in the closed position) a pair of
slidably mounted rods 32 the lower ends of which engage the
lock springs 31. When the door structure, is opened, the lock
springs which have an upward bias, free the lint trap for for
ward movement by the spring 29.
A circuit-interrupting switch 33 (see FIGS. 4 and 5) actu
~
In view of the foregoing, the general object of this invention
is to provide a new and improved clothes dryer.
It is a more particular object of this invention to provide, in
a clothes dryer, a new and improved interlock which
minimizes the possibility of unintentional operation of the
dryer.
ated by the lint trap structure 24 is mounted in a series ar
Another object of this invention is to provide, in a clothes
rangement with the switch 21 such that both switches must be
dryer, a combination maintenance reminder and safety inter 35 closed in order for the dryer 10 to operate, the switch 33 being
closed only when the li-nt trap is closed. It should now be ap
lock which ‘cooperates to minimize the possibility of accidents
parent that opening of the door structure 19 e?ects opening of
and minimize the occurrence of air?ow restriction.
the lint trap structure 24, which, both reminds the user of the
BRIEF SUMMARY OF THE INVENTION
need for cleaning of the lint trap and the necessity for [reinser
tion of the lint trap by the operator from outside the dryer to
restart the dryer. To facilitate opening and closing of the door
Brie?y, the above-cited objects are accomplished by the
provision, in a clothes drying apparatus, of a pair of series con
structure and the lint trap, they are respectively providedwith
nected switches, both of which must be closed in order for the
handles 34 and- 35.
*
apparatus to operate. One of the switches is operatively as
sociated with the dryer door while the other is operatively as 45 Since numerous changes may be made in the above ap
paratus and different embodiments may be made without de
sociated with a lint trap. The lint trap is automatically moved
parting from the spirit thereof, it is intended that all matter
out of the air?ow path to a position partially beyond the front
contained
in the foregoing description or shown in the accom
wall of the dryer where it is plainly visible and readily accessi
panying drawings, shall be interpreted as illustrative and not in
ble for cleaning and'movement by the operator back into the
50 a limiting sense.
I claim:
Further objects and advantages of the present invention will
1. In dryer apparatus having cabinet structure with a basket
become apparent when considered in view of the description
stream of air.
of the preferred embodiment of the invention and drawings
forming a part thereof.
supported therein for rotation about a substantially horizontal
axis; air circulation means and heater structure for warming
55 air circulated by the air circulation means; and means includ
ing duct work for channeling the air circulated through the
DESCRIPTION OF THE DRAWINGS
basket in a speci?c manner; structure including a motor for ef
fecting rotation of the basket and the air circulation means; ‘a
FIG. 1 is a perspective view of a clothes dryer representing
the invention;
front panel structure having an opening in registry with an
FIG. 2 is an enlarged fragmentary view, in section, of the
60 open front of the basket and door structure carried by the
lower left comer of the dryer shown in FIG. 1;
front panel for closing the openings during operation of the
FIG. 3 is an enlarged fragmentary view of mounting struc
dryer; control means for initiating, controlling and timing the
ture for a lint trap forming a part of the invention; and,
operation of the motor and heater structure, in accordance
FIG. 4 is a pictorial view, in perspective, of an interlock
with a selected cycle of operation, the improvement compris
forming a part of the invention;
65 mg:
FIG. 5 is a schematic diagram of a partial dryer control cir
a lint ?lter disposed in the path of the circulated air,
cuit having both a door switch and a lint trap switch.
means cooperating with said door structure for interrupting
the operation of said dryer apparatus, means for effecting
DESCRIPTION OF THE PREFERRED EMBODIMENTS
withdrawal of said lint ?lter from the path of the circu
Referring now to the drawings, especially FIG. 1, reference
lated air in response to the opening of said door structure,
character 10 designates generally dryer apparatus comprising
cabinet structure 11 including front, top and rear walls 12, 13
and 14, respectively. The top wall 13 has attached thereto a
back splasher panel 15 having control knobs 17 and 18
thereon.
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75
means for preventing continued operation of said dryer ap~
paratus when said door structure has been opened during
a cycle of operation,
said means for preventing continued operation of said dryer
apparatus being operable by said lint trap ‘when moved
3
3,579,851
4
front of the basket and door structure carried by the front
back into the path of the circulated air, to continue the
panel for closing the openings during operation of the dryer;
cycle of operation.
control means for initiating, controlling and timing the opera
2. Structure as speci?ed in claim 1 wherein,
said means for preventing continued operation of said dryer
apparatus comprises a circuit interrupt switch connected in
tion of the motor and heater structure, in accordance with a
selected cycle of operation, the improvement comprising:
a lint ?lter disposed in the path of the circulated air,
means including structure cooperating with said door struc
series with said means cooperating with said door structure for
interrupting the operation of said dryer apparatus.
ture upon opening thereof for effecting movement of said
lint ?lter from the path of the circulated air,
3. In dryer apparatus having cabinet structure with a basket
supported therein for rotation about a substantially horizontal
in its open position effects interruption of dryer operation
and circuit interrupt means operable upon such movement
of said lint ?lter.
7. Structure as speci?ed in claim 6, wherein
control circuit only when said trap is normally disposed in said
tering the air in said ?ow path, said cabinet including door
axis: means including a circuit for controlling said dryer,
an access door and associated switch means, said door when
said structure cooperating with said door structure serves to
through said door actuated switch means; means forming
retain said lint ?lter in its original position when said door
an air circulation path,
structure is closed but is ineffective when said door struc
a lint trap or ?lter normally disposed in said path and means 15
ture is open.
.
for moving said trap or ?lter, in response to opening of
8. Control means for a laundry apparatus having a cabinet
said dryer door to a position at least partially outside of
housing a rotatable drum and adjacent heater means and
said cabinet structure;
means for driving said drum and forcing air through said
switch means responsive to said lint trap to complete the 20 cabinet in a predetermined flow path, and ?lter means for ?l
path;
.
means movable between an opened and closed position for ac
cess to said drum and further de?ning means for removably
said means for moving said trap or ?lter including means
normally biasing said lint ?lter towards said position at
receiving said ?lter means for insertion through said cabinet
least partially outside said cabinet structure; and
25 into said ?ow path, said control means including: means cooperating with said dryer door for preventing
a door-actuated switch means which is closed only when
movement of said lint ?lter to said last-mentioned position
when said dryer door is closed and said lint trap is in said cir
said door is closed;
I
_
a ?lter-actuated switch means WhlCh lS closed only when
culated air path.
said ?lter is disposed within said ?ow path;
means normally biasing said ?lter to a position other than
4. Structure as speci?ed in claim 3 wherein, said switches
said ?ltering position; and,
are connected in series and closed when said ?lter is in the
latch means for retaining said ?ltering means in said ?ow
path of the circulated air and said door is closed.
5. Structure as speci?ed in claim 3 wherein,
said lint trap comprises a rigid frame member, and
said means for preventing movement of said lint ?lter com 35
prises at least one spring member movable into frictional
engagement with said frame member by means of a rod
engaging the lower edge of said door structure when said
door structure is closed.
- 6. Indryer apparatus having cabinet structure with a basket 40
path against said biasing means, said latch means being
effective only when said door is in a closed position and
said ?lter means is disposed within said path,
whereby said door must be closed and said ?lter must be
positioned in said ?ow path to actuate said apparatus and
opening said door releases said latch means allowing said
biasing means to move said ?lter to said other position.
9. The control means according to claim 8 wherein said
latch means includes a latching arm biased to an inoperative
supported therein for rotation about a substantially horizontal
axis; air circulation means and heater structure for warming
air circulated by the air circulation means; and means includ
ing duct work for channeling the air through the basket in a
speci?c manner; structure including a motor for effecting
position and a follower rod having one end abutting said arm
and the other end abutting said door means, wherein said rod
moves said arm against said bias and into engagement with
said ?lter means when said door is moved to said closed posi
tion.
rotation of the basket and the air circulation means; a front
panel structure having an opening in registry with an open
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