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Патент USA US3090386

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May 21, 1963
3,090,375
A. G. NELSON
OVEN DooR STRUCTURE
Filed Aug. l0, 1961
2 Sheets-Sheet 1
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May 21, 1963
A. G. NELSON
3,090,375
ovENv DooR STRUCTURE
Filed Aug. l0, 1961
2 Sheets-Sheet 2
3,090,375
Patented May 21, 1963
l
3,090,375
OVEN DÜOR STRUCTURE
Averd G. Nelson, Wisconsin Rapids, Wis., assigner to
Preway, Inc., a corporation of Wisconsin
«
2
lani'sms are alike and only one is illustrated in detail in
FIGS. l, 2, 3 and 4 and described herein.
The door 15 is pivotally mounted for movement from
a substantially vertical closed position to la substan-tially
Filed Aug. 10, 1961, Ser. No. 130,553
horizontal open position by means of a hinge plate 16
4 Claims. (Cl. 126-194)
mounted on each of the lsidewalls 11 and 12 by suitable
This invention relates to an oven door and more par
ticularly to a removable oven door and hinge mechanism.
jects íorwardly »and downwardly from hinge plate 16
«securing means such as screws 17'. A hinge arm `18 pro
It is a general object of the invention to provide a new
‘and -improved oven door of -the type described.
A more specific object is to provide .a new and im
and is pivotally connected by a pivot pin 20 to a door
1S in a manner more fully described herein later.
The door 15 comprises front and rear rigid sheet met-al
plates 2,1 and 22 respectively, suitably spaced so as to
proved detachable oven door mounting construction of
provide a »substantially enclosed gap 15a therebetween.
the ltype described including a hinge member for pivotally
The rear plate 22 is slotted as 'at 23 to receive the hinge
mounting the door for movement between a fully open 15 arm 13 projecting from the hinge plate 16. An arcuately
and a closed position, and improved latching means on
curved door control aum 24 integral with a hinge member
` l the door and hinge member detachably securing the door
36 attached to the door, described respectively, projects
`thereto and cooperating with spring means, which urge
rearwardly «and downwardly through an opening 25> pro
the door toward a parti-ally open position, said coopera
vided in the oven casing.
tion maintaini-ng the door positively secured to the oven 20
To control the movement of the door 15 a lever 27
in every position other than the partially open position,
is pivoted as at 28 to oven sidewall 11. Lever 2’7 projects
and means for neutralizing the cooperation between the
forwardly and is arranged to bear on a roller 30 mounted
spring :and latching means when the door is in the par
on >the free end of arm 24 eccentrically of the pivot axis
tially »open position whereby the door may be detached
of the door structure. The lever 2,7 bears -on the roller 30
without the manipulation of separate latching means.
25 at all times and is provided with cam :surfaces on its un
Other objects and advantages will become readily ap
parent from the following detailed description taken in
connection with the accompanying drawings, in which:
»the door from the Ifully open position towards the ajar
position, to maintain the door in .the ajar position (FIG.
FIG. l is a front elevational view of an oven having a
3), and to maintain the door in the closed position. A
derside near fthe free end which are arranged to urge
front door incorporating my invention, the door being 30 spring 31 is connected to the mid-portion of lever 27
shown in closed position in this iigure and with parts
and to a plate 32 suitably secured to the sidewall 11,
broken away;
FIG. 2 is an enlarged fragmentary sectional view taken
at the line 2_2 in FIGURE l;
thereby biasing the lever downwardly and maintaining
it in engagement with «roller 30.
Near the free end, the lever 27 is notched to p-rovide
FIG. 3 is a fragmentary sectional View simi-lar to FIG. 35 ‘a forwardly inclined earn surf-ace 33 and an intersecting
Z but with the door shown in an ajar position;
cam surface 34 which cooperate in a manner fully de
FIG. 4 is a fragmentary sectional view similar to FIG.
scribed in Patent No. 2,845,923 to maintain the door 15
2 with the door shown in a fully open position; and
in lthe >ajar position as shown in FIG. 3. Thus, in the
FIG. 5 is an enlarged perspective View of the door
ajar position, the inclination of the surface 33' is such
40
frame member forming part of the present invention.
that it opposes closing movement of the door While surWhile an illustrative embodiment of the invention is
face 34 unges closing movement, resulting in the neutral
shown in the drawings and will be described in det-ail
ization of the spring forces and the maintenance of the
herein, ‘the invention is »susceptible of embodiment in
door in thi-s position. As seen in FIG. 4, when the door
many different forms, and it should be understood that the 45 15 is in the fully open position the weight thereof counter
present disclosure is to be considered as Ian exempliñca
balances the tendency of the hinge mechanism to close the
tion of the principles of the invention and is not intended
door and the door will remain in this position until
to limit the invention to the embodiment illustrated. The
moved manually. When the door is moved to the closed
scope of the invention will be poi-nted out in the appended
position, -as shown in FIGURE 2, the roller 30 passes
claims.
50 around the surface 33 and is engaged by a downwardly
This invention constitutes an improvement over the
and rearwardly inclined cam Ásurface 35 at the free end
oven door mounting described in Patent No. 2,845,923,
of lever 2.7 which lholds the door in a closed position.
assigned to the assignee of this application.
Thus, the hinge mechanism serves to maintain the door
Referring now to the drawings in more detail, an oven
10 is illustrated with an oven door intended for use with
the hinge mechanism shown in ysaid patent.
The oven 10 comprises la casing having sidewalls 11
and 12, a top Wall 13, ya bottom wall 14, and a rear Wall
(not shown), which define a cooking chamber having
structure in the fully closed position (FIG. 2), ‘and in the
fully open position (FIG. 4). A moderate manual move
ment of the door .structure from the fully open position
`causes the door structure to be urged to the aja-r position
(FIG. 3) under the iniluence of the lcam surface 33 on
the lever 27 and the spring 31. When the door structure
a front opening adapted to be closed by a door 1S. The 60 is in the ajar position the spring forces Iare neutralized by
hinge mechanism with which the embodiment of the
the cooperating cam surfaces 33` and 34 and the doorY
present invention is employed is fully described in the
remains in the ajar position until a moderate manual
above mentioned Patent No. 2,845,923, ‘and will be
pull moves it therefrom.
brieñy referred to herein. While a hinge mechanism is
To etïect the detachable mounting of the door 15 on
associated with each bottom corner of door 15, the mech 6 the oven 10, the hinge member 36 is pivotally engaged
3,090,375
3
ing easier access for cleaning or the like, without the
at pin 20 to hinge arm 18 and is adapted for releasable
latching engagement with the door 15. To this end
member 36 has an elongated body portion 36a which
need for the manipulation of separate latching devices.
I claim:
l. In an oven having walls defining a cooking chamber
with a front opening therein, a door structure comprising:
a door; a projecting hinge arm adjacent the bottom edge
of said opening; a hinge member pivotally secured to said
arm and adapted to support the door for movement
is enlarged at the free end 36h to form a ledge or latch
ing portion 36C. The ledge 36e, in the embodiment illus
trated, extends toward the rear of the cooking chamber
or, in a direction generally coincident with the direction
of closing movement of the door 15.
between a substantially fully open position, an ajar posi
Referring to FIGS. l and 5, a box-like frame indicated
generally at 37 is positioned in the door gap 15a and is l0 tion and a closed position, cooperating latc'ning portions
on said hinge member and door for releasably securing
secured to the door 15 to effect the latching engagement
the door thereto including an extension on the hinge
thereof to the oven 14). Preferably, the frame 37 is
member having a ledge formed therein facing the cooking
secured to the rear plate 22 of the door 15 by any suit
able means such as welds or rivets 38 for which aper
chamber and a frame member secured to the door and
tures 4t) may be provided. The frame 37 includes a pair
of substantially parallel, spaced Walls 41 and 42 and a
adapted to engage said ledge to selectively releasably
secure said door to the hinge member; means applying
force to said hinge member to urge the door from adia
cent the fully open position to the ajar position, to main
tain the door in the ajar position, and to maintain the
second pair of spaced parallel walls 43 and ‘d4 substan
tially perpendicular to walls 41 and 4Z which deiine a
channel or socket, indicated at 45, for the reception of
the member 36. Preferably, the channel ‘l5 is dimen 20 door in t'ne fully closed position, said iatching portions
adapted to cooperate with the force applying means and
sioned to permit the free but snug passage of the enlarged
to utilize gravity in the fully open position to positively
end 36h of the member 36 whereby the ledge 36C latch
secure the door to the support member when the door is
ingly engages the top marginal edge 46 of the wall 44.
in any position other than the ajar position; and means
As can be seen in FIGS. 2 and 5, the walls 41 and 4l@
neutralizing the force on said member when the door is
have a length dimension about one half that of the walls
42 and 43, the lower terminal edges thereof being indi
cated at 41a and 44a, respectively. lIn the illustrated
embodiment, the longitudinal extent of channel 45, is
generally perpendicular to the axis of rotation of the door
15 about the pivot pin 2Q. A pair of lianges dllb and 30
in the ajar position whereby the latching portions may
41C may be provided to extend one from each end of
the wall '41 to provide guides for insertion of the hinge
member 36 Within the channel 45 and add rigidity to the
frame.
of said opening, an elongated hinge member pivot-ally
be disengaged and the door detached from the oven.
2. In an oven having walls deñning a cooking chamber
with a front opening therein, a door structure comprising:
a door; a projecting hinge arm adjacent the bottom edge"
secured at one end to said arm and adapted to> support
the door for movement between -a fully open position, an
ajar position and a closed position, cooperating latching
Thus, the unique latching arrangement herein described 35 portions on said hinge member and door for releasably
securing the »door thereto, including -a ledge formed close
aiîords a positive engagement of the door l5 on the oven
ly adjacent the free end of the hinge member and a frame
10 during the opening and closing movements, while
member secured `to the door, said frame defining a chan
facilitating disengagement and removal ot the door with
nel adapted to guide for insertion and snugly receive the
out the manipulation of separate locking devices. Refer
ring to FIG. 2 which illustrates the door 15 in the fully 40 free end of said hinge member and having a marginal edge
adapted to latehingly engage said ledge when the hinge
closed position, it is seen that the force of the spring 31
member is received in said channel thereby securing the
transmitted through the lever 27, roller 30 and arm 24
door to the hinge member; means applying force to said
to the hinge member 36 maintains the latching engage
hinge member to urge the door from adjacent the fully
ment between the ledge 36C and the edge 45, thereby
open position to the fully closed position, said ledge and positively securing the door 15 to the oven lll. As the
marginal edge adapted to cooperate with the force apply
door 1S is moved manually from the closed position to
ing means to positively secure the door to the hinge mem
the fully open position (PIG. 4), the manual force and
ber when the door is positioned to either side of the ajar
the weight of the door combine to resist the previously
position; and means neutralizing the force on said hinge
described action of the spring 31 and the cam surface 33
in the urging of the door 15 to the ajar position, thereby 50 member when the door is in the ajar position whereby
the latching of the ledge and marginal edge may be dis
maintaining the positive latching between the latching
engaged and the door detached from said support.
portions 36C and 46 of the member 36 and the frame
37, respectively.
In the fully open position shown in FIG. 4, the weight
of the door 1S is sufiìcient to maintain the latching engage
ment, as is the case, similarly, when movement occurs
from this position to the aiar position (FIG. 3).
In the ajar position, the spring forces are neutralized,
as described previously, and the door 15 is permitted to
remain in this position as desired. ‘Because of the slight
downward inclination of the door structure, there exists a
suñicient component of the weight thereof bearing against
the latching portions to maintain their mutual engage
ment and thereby, the positive mounting of the door 15.
However, if it is desired to remove the door struc
ture, it is necessary merely to rotate the door 15 slightly
in the direction of the closed position (FIG. 3) thereby
tilting the frame 37 about the member 36 and disengag
ing the edge 46 from the ledge 36C. The door 15 is now
free and may be lifted out of its mounting with a mini
mum of effort. ‘It is necessary only to reverse the pro
3. The oven door structure as described in claim 2
wherein the ledge at the free end of the member extends
in a direction generally the same as the direction of the
closing movement of the door.
4. In an oven having walls deiining a cooking chamber
with a front opening therein, a door structure comprising:
a door; a projecting hinge arm adjacent the bottom edge
60 of said opening, an elongated hinge member pivotally se
cured at one end to said arm and adapted to support the
door for movement between a fully open position, an
yajar position and a closed position, cooperating latching
portions on said hinge member and door for releasably
securing the door thereto, including a ledge formedy closely
adjacent the free end of the hinge member and extend
ing toward the cooking chamber and a frame member se
cured Ato the door, said frame having a channel adapted
to snugly receive the free end of said hinge member and
having a marginal edge adapted -toy latchingly engage said
ledge when the hinge member is received in said channel
thereby securing the door to the hinge member, said chan
nel terminating short of an outer end of the frame mem
cedure to remount the door structure. rfhus, the positively
ber whereby relative movement of the hinge member is
secured door may be readily detached and remounted by
a housewife during the normal course of activities provid 75 facilitated and a guide on the frame member facilitating
5
3,090,375
insertion of the hinge member into the channel; means
ajar position whereby the latching of the ledge and mar
applying force to said hinge member to urge the door
from adjacent the fully open position to the fully closed
ginal ),dge maybe disengaged and the door detached from
Said SUPPOTÍ
position, said ledge and marginal edge adapted to c0oper~
ate with the force applying means to positively secure the 5
door to the hinge member- when the door is positioned to
either side ‘of the ajar position; and means neutralizing
the force on said hinge member when the door iS in “the
.
.
.
References Clim m the me of thls patent
UNÍTED STATES PATENTS
2,845,923
Nelson ______________ __ Aug 5, 1958
3,003,495
‘Coultrip _____________ __ Oct. 10, 1961
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