U.S. patent number 3,677,259 [Application Number 05/086,730] was granted by the patent office on 1972-07-18 for removable door structure.
This patent grant is currently assigned to Whirlpool Corporation. Invention is credited to John T. Doner.
United States Patent |
3,677,259 |
Doner |
July 18, 1972 |
**Please see images for:
( Certificate of Correction ) ** |
REMOVABLE DOOR STRUCTURE
Abstract
A door such as an oven door structure in which an enclosure such
as the oven has an access opening with a door for closing the
opening mounted for rotation about an axis between closed and open
positions with the door being easily removable when desired by
moving it to a position between open and closed and moving the door
by pushing the door downward against a yieldable urging means in a
direction to move a pin of each of two pairs of pins into alignment
with a side opening in a slot, moving these pins through the
opening followed by moving a second pair of pins out of their
openings with the result that the door is completely removed from
the enclosure. In the preferred construction a pivotally mounted
link arm on each side of the door is movable about an axis spaced
from the door axis so that the link arms and the door pivot at
different rates and with a cavity in each arm that coincides with a
pin removal slot only when the door is in its intermediate
removable position so that the door can only be removed in the
above manner in this intermediate position. An automatic safety
catch is provided so that when the door is removed the hinge
mechanism is prevented from closing against the enclosure prior to
reinstallation of the door on the hinge mechanism.
Inventors: |
Doner; John T. (Marion,
OH) |
Assignee: |
Whirlpool Corporation
(N/A)
|
Family
ID: |
22200510 |
Appl.
No.: |
05/086,730 |
Filed: |
November 4, 1970 |
Current U.S.
Class: |
126/194; 16/267;
16/287 |
Current CPC
Class: |
F24C
15/023 (20130101); E05Y 2201/488 (20130101); Y10T
16/53832 (20150115); E05Y 2900/308 (20130101); E05Y
2201/416 (20130101); Y10T 16/53615 (20150115) |
Current International
Class: |
F24C
15/02 (20060101); F23m 007/00 () |
Field of
Search: |
;126/194 ;16/149 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Dority, Jr.; Carroll B.
Claims
The embodiments of the invention in which an exclusive property or
privilege is claimed are defined as follows:
1. A door structure, comprising: means forming an enclosure having
an access opening; a door for closing said opening movable about an
axis between closed and open positions and having a pair of spaced
recesses; a pair of side hinge members mounted on said enclosure; a
pair of structural members each hingedly connected to a said hinge
member; pairs of spaced pins on said door extending into each of
said recesses; means on each said structural member providing a
pair of spaced elongated slots, a first slot of each pair having an
end opening and the second slot of each pair having a side opening
and a closed end, the pins of each pair of pins being locatable in
each pair of slots when the door is mounted on said structural
members; yielding means urging the door in a direction to press a
pin of each pair into a said second slot closed end and away from
the corresponding side opening, the door when in an intermediate
removal position between fully open and fully closed positions
being thereby displaceable relative to said structural members
against the urging of said yieldable means for aligning a second
slot pin of each said pair with a side opening for movement
therethrough followed by removal of the first slot pins through
said first slot end openings in removing the door from the
structural members and thus from said enclosure; a pair of link
arms; means pivotally mounting each arm for pivotal movement with
said door about an axis spaced from said door axis; and means
providing a cavity in each arm coinciding with a first slot of each
said pair of slots only when the door is in said intermediate
removal position to permit said removing displacing of the
door.
2. A door structure, comprising: means forming an enclosure having
an access opening; a door for closing said opening movable about an
axis between closed and open positions and having a pair of spaced
recesses; a pair of said hinge members mounted on said enclosure; a
pair of structural members each hingedly connected to a said hinge
member; pairs of spaced pins on said door extending into each of
said recesses; means on each said structural member providing a
pair of spaced elongated slots, a first slot of each pair having an
end opening and the second slot of each pair having a side opening
and a closed end, the pins of each pair of pins being locatable in
each pair of slots when the door is mounted on said structural
members; and yielding means urging the door in a direction away
from said axis to press a pin of each pair into a said second slot
closed end and away from the corresponding side opening, the door
when in an intermediate removal position between fully open and
fully closed positions being thereby displaceable relative to said
structural members by pushing downwardly on the door against the
urging of said yieldable means for aligning a second slot pin of
each said pair with a side opening for movement therethrough
followed by removal of the first slot pins through said first slot
end openings in removing the door from the structural members and
thus from said enclosure.
3. The structure of claim 1 wherein each said cavity is bounded by
a pair of side shoulders, one of which underlies a first slot pin
to block said door displacing at all position of said door except
said intermediate removal position.
4. The structure of claim 1 wherein there are provided a stop
portion on each link arm, and a stop member against which each said
stop portion bears when said door is in said intermediate position
to retain said door in said intermediate position.
5. The structure of claim 4 wherein spring means are provided
yieldably holding said link arms against said stop members.
6. The structure of claim 5 wherein said spring means are connected
between said link arms and said enclosure for urging said door
toward closed position simultaneously with the holding of said arms
against said stop members.
7. The structure of claim 1 wherein each said link arm is pivotally
connected to a structural member adjacent a said first slot.
8. The structure of claim 5 wherein each said hinge member has
mounted thereon a said link arm and a said spring means thereby to
provide a subassembly comprising a structural member, a hinge
member, a link arm and a spring means installable on and removable
from said enclosure as a mechanical unit.
9. The structure of claim 7 wherein said link arm is pivotally
connected to a connecting arm which is pivotally mounted on said
hinge member.
10. The structure of claim 9 wherein each said spring means is
connected between a said connecting arm and a said hinge
member.
11. A door structure, comprising: means forming an enclosure having
an excess opening; a door for closing said opening movable about an
axis between closed and open positions and having a pair of spaced
recesses; a pair of side hinge members mounted on said enclosure; a
pair of structural members each hingedly connected to a said hinge
member; pairs of spaced pins on said door extending into each of
said recesses; means on each said structural member providing a
pair of spaced elongated slots, a first slot of each pair having an
end opening and the second slot of each pair having a side opening
and a closed end, the pins of each pair of pins being locatable in
each pair of slots when the door is mounted on said structural
members; yielding means urging the door in a direction to press a
pin of each pair into a said second slot closed end and away from
the corresponding side opening, the door when in an intermediate
removal position between fully open and fully closed positions
being thereby displaceable relative to said structural members
against the urging of said yieldable means for aligning a second
slot pin of each said pair with a side opening for movement
therethrough followed by removal of the first slot pins through
said first slot end openings in removing the door from the
structural members and thus from said enclosure; and catch means
for maintaining said side hinge members and said structural members
in said intermediate removal position while the door is removed,
said structural members having apertures therein to movably receive
said catch means for limited movement thereof along the axis of
said structural members and each of said catch means being provided
with a recess to receive said second slot pin for support of said
catch means, said apertures being above said second slots, whereby
on removal of the door causing said second slot pin to move away
from said hinge mechanism, said catch means under the influence of
gravity will automatically move down in front of at least a portion
of said side hinge members in interference relation therewith
preventing said structural members from moving into fully closed
position.
Description
One of the features of this invention is to provide an improved
door structure that includes a removable door that can only be
removed when in one position intermediate between fully open and
fully closed with a yieldable means normally retaining the door
locked on the enclosure but having cooperating release means that
permits moving the door to release position when it is in the
intermediate position.
Another feature of the invention is to provide an improved door
structure in which the door may be removed by pushing down on the
door whereby the door may be removed without difficulty be even a
relatively short person.
A further feature of the invention is to provide an improved
removable door structure that includes a safety catch means which
functions automatically to prevent an inadvertent closing of the
hinge mechanism during the period between removal of the door and
reinstallation of the door on the hinge mechanism.
Other features and advantages of the invention will be apparent
from the following description of one embodiment as illustrated in
the accompanying drawings. Of the drawings:
FIG. 1 is a perspective view of a typical cooking oven on which the
door structure of this invention may be used.
FIG. 2 is an enlarged fragmentary sectional detail view looking to
the left from inside the oven as viewed from the front of FIG. 1 in
the vicinity of the left-hand hinge structure and showing the door
and associated structure in three positions with position A being
fully closed, B being an intermediate broil and removal position
and C being fully open.
FIG. 3 is a vertical sectional view similar to a portion of FIG. 2
and showing the door and associated structure in the intermediate
or B position illustrating its removal.
FIG. 4 is an enlarged detail view of a portion of the structure of
FIG. 3.
FIG. 5 is similar to FIG. 4 but illustrates the positions of
certain parts while the door structure is moving from the closed or
A position to the intermediate or B position.
FIG. 6 is a view similar to FIG. 5 but showing the position of
certain parts of the door structure when the door is in fully open
or C position.
FIG. 7 is a fragmentary perspective view of a portion of the inside
of the door structure at the lower left thereof illustrating
details of the mounting arrangement.
FIG. 8 is a perspective view of a catch means employed to prevent
closing of the hinge mechanism when the door is removed.
FIG. 9 is a side elevational view looking to the left from outside
the oven showing a fragmentary portion of the right-hand hinge
structure with the door in place and the disposition of the catch
means when the hinge mechanism is opened to the intermediate
position. Portion of the door structure have been removed to
illustrate details.
FIG. 10 is a detail perspective view of certain elements of the
structure of FIG. 9 but with the door removed to illustrate the
operation of the catch means.
FIG. 11 is an enlarged fragmentary front elevational view, taken
substantially along the line 11--11 of FIG. 10 showing details of
the mounting arrangement for the catch means.
In the embodiment illustrated in the drawings the enclosure
comprises a household cooking stove oven 10 having an access
opening 11 thereto together with a door 12 for closing this
opening.
On each side of the enclosure adjacent the bottom of the opening 11
are a pair of side hinge members 13 each of which extends inwardly
of the front panel 14 of the oven that surrounds the opening 11.
Each member 13 is provided with a forwardly and downwardly
projecting nose 15 to each of which is hingedly connected a
structural member 16 which is parallel to the other member 16 and
normally retained within the interior of the door 12. Thus the
structural members 16 are permanently mounted on the hinge members
13 about the lower hinges 17 so that the door 12 is movable between
fully closed position and fully open position about the axis
defined by the opposite lower hinges 17.
On each side of the interior of the door there is provided a pair
of vertically spaced, inwardly extending parallel pins 18 and 19
that extend into a pair of spaced recesses 20 (see FIGS. 2 and 7)
on opposite sides of the door with each recess opening toward the
interior of the oven in substantial alignment with a panel opening
21 (FIG. 2) in front panel 14.
Each of the side structural members 16 is provided with a pair of
spaced elongated slots 22 and 23. A first slot 22 of each pair has
an end opening through which the corresponding or upper pin 18 is
received. The second slot 23 of each pair has a side opening that
opens toward the front of the door and a closed end 24 which in the
illustrated embodiment is the upper end. Thus when the door is in
mounted position on the oven the pairs of pins 18 and 19 on either
side of the door are located in their respective slots 22 and 23 of
structural members 16 forming part of the hinge mechanism which is
mounted on the oven.
The structure also includes yielding means here shown as a helical
compression spring 25 installed in the door, with one of the
springs 25 being installed in each side of the door although only
one of the springs 25 is illustrated. The springs 25 urge the door
in a direction to press a pin 19 of the two pairs of pins into the
second slot 23 closed end 24 and away from the corresponding side
opening in this slot. Thus in the illustrated embodiment the
yielding means or spring 25 bears against a fixed bracket 26 on the
interior of the door 12 and using this as a base bears against a
slidable plunger piece 27 mounted in the door, which itself bears
against an elongated end 28 at the top of the structural member 16
with this elongated end 28 defining the front side of the upper
slot 22 which is the side adjacent the front of the door 12.
With this structure the door when in its intermediate position as
shown at B in FIG. 2 and most clearly in FIG. 3 is thereupon
displaceable relative to the side structural members 16 against the
urging of the springs 25 by pushing downward on the door so that
the two second slot pins 19 of each pair can be aligned with the
side opening of the slot 23 and then the door manipulated by
pivoting it to move the pin 19 out of the slot as illustrated by
the broken lines in FIG. 3 following which the upper pin 18 of the
two pairs of pins can be lifted from its slot 22 thereby removing
the door.
The intermediate removal position B of the door 12, shown in FIG.
2, may also advantageously serve as the partially open "Broil"
position of the door to facilitate broiling operations when the
oven 10 is provided with an electrical resistance broil element in
an upper portion thereof.
In order to prevent removal of the door from the oven except in the
intermediate removal position B there are provided a pair of link
arms 29 with one arm being on each side of the oven opening. Each
link arm 29 is pivotally mounted about a hinge connection 34 with
the hinge 34 being spaced from the hinge 17 of the door so that the
door and link arms are moved simultaneously but about different
axes. Each link arm 29 is provided with an end cavity 31, here
shown as a recess, on the upper surface of the front end of each
arm 29. These cavities 31 coincide with a first or upper slot 22
only when the door is in its intermediate removal position, as
described. When in this intermediate position and with the cavities
and slots coinciding as described the door can easily be displaced
by moving it downwardly to compress spring 25 and pivoting the base
of the door outwardly as indicated in FIG. 3 so as to permit
removal of the lower pins 19 from their slots 25 and resulting
removal of the entire door as described.
The invention is illustrated in connection with an oven in a free
standing range. It will be appreciated that it also may be employed
in ovens of the built-in variety. In such ovens the advantages of
the present invention are even more striking in that such ovens are
generally higher off the floor increasing the door removal problem
for a relatively short person. Thus, the ability to remove the door
by pushing down on it greatly facilitates removal of the door and
is an important advantage of the present invention.
As shown most clearly in FIGS. 4, 5 and 6 each cavity 31 is bounded
by a pair of side shoulders 32 and 33 one of which underlies the
corresponding pin 18 to block the downward movement of the door at
all positions of the door except the intermediate removal position.
Thus when the door is in its normally closed position, or adjacent
thereto, the shoulder 33 underlies the pin 18 to block this
downward movement (see FIG. 5). When the door is between its
intermediate removal position and the fully open position as shown
in FIG. 6 the shoulder 32 of each pin underlies the corresponding
pin 18 to block removal movement.
The end which is the rear end of each link arm 29 is pivoted about
an axis defined by the hinge connection 30. As stated earlier, the
other or forward end of the link arm 29 is hingedly connected about
a hinge 34 which engages the top of the corresponding structural
member 16 immediately adjacent and beneath the first or upper slot
22. Located immediately above the hinge members 13 and inwardly of
the front panel 14 are a pair of rollers 35 each having a
peripheral groove 36. The bottom edge 37 of each link arm 29 rides
in this groove 36 so that as the door is moved between open and
closed positions the engagement of the bottom edge 37 of each arm
29 rotates the corresponding roller 35 which may be made of nylon
or the like. In order to releasably retain the door in the
intermediate position for broiling operations in the oven or
preparatory to removal this bottom edge 37 is provided with a stop
portion 38 in the form of a step.
The hinge connection 30 of each link arm 29 is held in the upper
end of a connecting arm 39 whose lower end is pivoted to the hinge
member 13 about a hinge pivot 40. Each hinge connection 30 is
movably held in an elongated grove 41 at the rear end of the link
arms 29 in order to permit movement of the link arms 29 relative to
their connecting arms 39 when the door is moved between open and
closed positions. Each connecting arm 39 is provided with a helical
tension spring 42 one end of which is connected to the innermost
end 43 of a spring anchor 13a attached to each hinge member 13, and
the other end of which is connected to a bracket 44 on the arm 39.
Spring anchor 13a is provided with a series of screw fastener
holes, not shown, adapted for alignment with adjustment slots 47 in
member 13. Each side hinge member 13 is fastened to the spring
anchor 13a by a pair of screws 45 and 46 which enter the screw
fastener holes in anchor 13a via the adjustment slots 47 in members
13. Each hinge member 13 is provided with two spaced groups of
three slots 47 in linear alignment, as shown in FIG. 2, to provide
for adjustment of the length of the hinge mechanism which is
mounted on the oven comprising side hinge members 13, structural
members 16 link arms 29, connecting arms 39, spring anchors 13a,
and helical tension spring 42. With the illustrated arrangement the
hinge mechanism length can be adjusted approximately plus or minus
two inches thus facilitating use of the hinge mechanism in ovens
having doors of different weights. With the illustrated arrangement
the pair of springs 42 urge the door toward closed position at all
times and because of the provision of the pin slots or grooves 41
hold the lower edge 37 of each link arm 29 against its roller 35.
Thus the combination of the pair of springs 42 and the stop
portions 38 on the arms 29 retain the door in intermediate position
for broiling or preparatory to removal when the door has been moved
to this position.
The present invention includes means for preventing closing of the
hinge mechanism when the door is removed comprising a safety catch
50 (FIG. 8) which, on removal of the door, automatically operates
to prevent closing of the hinge mechanism until the door is
reinstalled on the hinge mechanism. The spring 42 is relatively
strong and when the counterweight afforded by door 12 is removed
the hinge mechanism including side hinge member 13, structural
member 16 and link arm 29 might close against the oven front panel
14 with considerable force were it not for the provision of safety
catch 50.
The safety catch 50 comprises a somewhat elongated strip of metal
having a flat base portion 50a, and an end portion thereof formed
at approximately a right angle to the base portion and provided
with notches at 41 and 52 to form a hook portion 53 and with notch
52 being adapted to receive an ear 13a on the top front projection
of side hinge member 13. The catch member 50 includes a side recess
54 to receive lower pin member 19 to provide support for catch 50
to hold it in an upper position (see FIG. 9) affording clearance
for ear 13a when the door 12 is in place on the hinge mechanism.
Catch 50 also includes a slot 55 on its lower edge which slidingly
cooperates with the door hinge 17 (see FIG. 11). Hinge 17 comprises
a hinge pin which passes through the nose 15 of hinge member 13,
the lower end of structural member 16, and slot 55 of catch 50. A
pair of spring steel retaining rings 60 such as Truarc "E" rings
manufactured by Truarc Retaining Rings Division of Waldes Kohinoor,
Inc. one being installed on either side of catch 50, fasten
elements 13, 16, and 50 to hinge 17. The structural members 16 are
provided with rectangular apertures 56 above slots 23 which are
wider than the distance between notches 41 and 52 but slightly
narrower than the catch member 50. On installation of the catch
member 50 in member 16 the hook portion 53 is cocked at an angle
(as indicated in broken line in FIG. 9) and the catch member is
inserted in the aperture 56 from the rear of structural member 16
(see FIG. 11), and catch member 50 is then rotated such that the
hook projections 53a and 53b overlie the sides of the aperture 56
to maintain the safety catch movably mounted on the structural
member 16 with the slot 55 being slidingly received on hinge 17 to
provide limited movement of catch 50 in aperture 56 along the axis
of member 16. When the door is in place, the lower pin 19 is
received in both the slot 23 of member 16 and in the door pin
recess 54 of the safety catch, holding the catch in an elevated
position (see FIG. 9) so that the projecting hook 53 of the safety
catch is above the hinge ear 13a and will clear hinge ear 13a on
closing of the door.
On removal of the door 12, the door is pushed down and manipulated
as described above to remove it. Such removal of the door thereby
removes the door pin 19 which supports the safety catch during
normal use of the oven from slot 23. The safety catch 50 is then
free to automatically move downward in aperture 56 under the
influence of gravity to its lowermost position (illustrated in FIG.
10) guided by the projections 53a and 53b on the hook member and
the recess 55 on the lower edge portion of catch 50 which slidingly
cooperates with the hinge 17. Thus, on removal of the door, the
catch 50 automatically moves downward to its lowermost position
under the influence of gravity and in such position the projecting
hook portion 53 of the safety catch is in interference relationship
(see FIGS. 10 and 11) with the projecting ear 13a of the side hinge
member 13 such that the hinge mechanism cannot be closed beyond
this point.
On reinstallation of the door, the insertion of the lower pin 19
carried by the door as described above will cause pin 19 to enter
recess 54 of the safety catch and if the door is pushed down and
manipulated into the installed position, the pin 19 will carry the
safety catch 50 to the raised position illustrated in FIG. 9
wherein the safety catch 50 will clear the ear 13a on rotation of
the door about its hinge axis defined by hinge 17. Thus, the safety
catch 50 provides positive means for automatically preventing an
inadvertent closing of the hinge mechanism during the period
between the removal of the door and reinstallation of the door on
the hinge mechanism.
In the preferred structure, as illustrated, each of the side hinge
members 13 has mounted thereon a spring anchor 13a, a structural
member 16, a link arm 29 through the corresponding connecting arm
39 and a spring 42 to provide a hinge mechanism subassembly which
can be assembled together and then mounted on the enclosure. This
subassembly is installable on and removable from the enclosure as a
mechanical unit. Thus in the specific embodiment the above
described mechanical unit includes the members 13, 13a, 16, 29, 39
and 42.
Having described my invention as related to the embodiment shown in
the accompanying drawings, it is my intention that the invention be
not limited by any of the details of description, unless otherwise
specified.
* * * * *