Note : Les revendications sont présentées dans la langue officielle dans laquelle elles ont été soumises.
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In an oven door having spaced apart inner and outer
door panels with aligned window openings and at least one
transparent pane in each window opening, a linkage system
for raising and lowering a shield positioned between said
door panels, a rotatable member mounted in said door above
the window openings, said rotatable member being rotated
during locking of the door shut on an oven, said linkage
system being connected to said rotatable member whereby such
rotational movement of said rotatable member is translated
by said linkage system into raising said shield to a
position which covers such pane in the outer door panel,
said linkage system including first and second link arms
which are pivotally connected together and which extend as
said shield is raised during the rotational movements of
said rotatable member; said first and second link arms
attaining a dead centre position when they are at their
maximum extension and said shield is raised to its maximum
height in the door, an oven-centre stop means for stopping
movement of said first and second link arms as they pass
their dead centre position thereby preventing continued down-
ward descent of said shield so that the shield is maintained
in a window covering position while the door is locked.
2. In an oven door of claim 1, rotation of said rotatable
member cooperating with a locking movement in a lock means
to lock said door shut on an oven, such locking movement
being activated by an externally operable grasp.
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3. In an oven door of claim 1, said rotatable member
having a locking portion extending outwardly of said inner
door panel and a manually operable grasp extending outwardly
of said outer door panel, said locking portion being adapted
to engage an oven frame and lock said oven door shut on an
oven upon rotation of said rotatable member.
4. In an oven door of claim 2 the unconnected end of said
first link arm being secured to said rotatable means.
5. In an oven door of claim 4, an L-shaped link arm being
pivotally mounted in said door to a side of said window open-
ings, a first leg of which has its end pivotally connected to
said second link arm and a second leg of which has its end
pivotally connected to said shield, said first leg extending
upwardly of said door and said second leg extending across
said door, and guide means for guiding movement of said
shield within said door.
6. In an oven door of claim 5, said guide means comprising
a guide link arm connected to said shield and mounted in said
door beneath said L-shaped arm where its pivot points at
each end in conjunction with the respective pivot points of
said L-shaped link arm define a parallelogram.
7. In an oven door of claim 6, a track system on which
said shield is mounted comprising first and second rods
extending vertically of said door located on each side of the
window, each end of said shield having overturned edges to
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define channels through which said first and second rods
extend, the overturned edges overlapping said shield suffi-
ciently to preclude disengagement of the shield from the rods
as it is raised and lowered.
8. In an oven door of claim 4, said stop means being
positioned within said door to block further movement of
said first link arm after it passes through the dead centre
position.
9. In an oven door of claim 8, a frame member in which
said rotatable member is mounted having a portion thereof to
one side constituting said stop portion.
10. In a self-cleaning oven with a windowed oven door,
said door including transparent window panes in its outer
and inner door panels, a shield located within the door for
blocking said window panes and shielding the outer trans-
parent pane from thermal radiation generated by said oven
operating at self-cleaning temperatures, a system to which said
shield is mounted being capable of raising and lowering the
shield to and from a window covering position, said system
comprising a rotatable member mounted in said door above said
window openings, the rotation of said rotatable member being
coordinated with a movement which causes locking of the door
shut on said oven, a first link arm secured to said rotatable
member and positioned for movement through a vertical plane
during rotation of said rotatable member, a second link arm
having one end pivotally connected to a free end of said first
link arm and the other end pivotally connected to an end of
an L-shaped link arm, said L-shaped link arm being pivotally
mounted to one side of said window within said door, the other
end of said L-shaped link arm being pivotally connected to said
shield, guide means for guiding movement of said shield, the
arrangement being such that rotational movement of said ro-
tatable member is translated into raising said shield to a
window covering position, said first link arm and said second
link arm being at their maximum extension when the axis of
rotation of said rotatable member, the pivot point between
said first and second link arms and the pivot point between
said second and L-shaped link arms are aligned, a stop means
for interfering with continued movement of said first and second
link arms to stop rotation of said rotatable member after
maximum extension of said first and second link arms, the weight
of said shield maintaining the interference with the movement
of said first and second link arms to thereby retain said shield
in the window covering position.
11. In an oven of claim 10, said first and second link
arms being located above said window at all times during
shield raising, said L-shaped arm having a first leg which
is connected to said second link arm, extending upwardly of
said door alongside the window, a second leg of said L-shaped
arm which is connected to said shield extending across said
door beneath said window when the shield is in its lowered
position, said second leg being pivotally connected to the
top portion of the shield.
12. In an oven of claim 10, said guide means being a
third link arm located below said L-shaped arm and having
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one end pivotally connected to said shield and the other end
pivotally mounted in said door with the pivot points of said
third arm and corresponding pivot points of said L-shaped arm
defining a parallelogram.
13. In an oven of claim 10, lock actuation means mounted
on the oven frame above said door, movement of said lock
actuation means to a door locking position rotating said
rotatable member by an interengagement between said lock
actuation means and said rotatable member.
14. In an oven of claim 13, said rotatable member having a
lug extending outwardly of said inner door panel, said lug
being received internally of said oven frame through a slot
provided therein, said lock actuation means having a portion
engaging said lug for rotation thereof upon movement of said
lock actuation means to a door locking position.
15. In an oven of claim 14, a handle mounted on said lock
actuation means and being external of said oven and above
said door.
16. In an oven of claim 10, said rotatable member
comprising a lug portion extending outwardly of said inner
door panel, said lug portion being adapted to engage the oven
frame in a manner to lock the door shut on said oven when
said rotatable member is rotated in the proper direction.
17. In an oven of claim 13, said rotatable member having
connected thereto an externally accessible grasp on said
outer door panel.
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18. In an oven door having spaced apart outer and inner
door panels with aligned window openings and at least one
transparent window pane in each window opening, apparatus
for holding said oven door at and releasing said oven door
from a closed locked position on an oven and for raising and
lowering a shield between said door panels to and from a
position which covers and shields such transparent window
pane in said outer door panel from thermal radiation
generated by an oven operating at high temperatures, said
apparatus comprising rotatable means mounted in said door
panels above said window openings, said rotatable means
having an oven frame engaging portion extending outwardly
from the inner door panel which is adapted to engage and
hold said oven door closed upon rotation of said rotatable
means to a door locked position, said rotatable means having
an arm extending outwardly from said rotatable means between
said door panels, said arm having its free end pivotally
connected to a first end of a link arm extending transversely
of the door above said window opening, a second end of said
link arm being pivotally connected to a device for raising
and lowering said shield, the position of said arm in a door
unlocked position being such that upon rotation of said
rotatable means to a door locked position, said arm and link
arm are extended to and retracted from maximum extension in
a direction transverse of said door where such transverse
movement is translated into raising and lowering said shield
by said device, a stop means for stopping rotation of said
rotatable means at a point where said arm and link arm are
retracting from maximum extension by continued door locking
rotation, said shield in its attempting to continue its
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downward movement maintains operability of said stop means
to hold said shield in the window covering position while
the oven door is locked shut on an oven.
19. In an oven door of claim 18, said device comprises an
L-shaped arm pivotally mounted on the inner panel of said
door to one side of said window opening, a first arm of
said L-shaped arm extending upwardly alongside the window
opening and having its upper end pivotally connected to said
link arm, a second arm of said L-shaped arm extending
transversely of said door beneath said window when said
shield is in its lowered position, the end of said second
arm being pivotally connected to the upper portion of said
shield, the transverse movement of said link arm pivoting
said L-shaped arm to either raise or lower the shield
depending upon the direction of rotation of said rotatable
means, and guide means provided to guide the movement of
said shield.
20. In an oven door of claim 19, said guide means com-
prising a second link arm pivotally connected to said shield
at one end and at the other end pivotally mounted on said
inner door panel, the respective pivot points of said L-shaped
arm and second link arm being in parallelogram relationship.
21. In an oven door of claim 18, said rotatable means
being mounted in a frame secured to said inner door panel,
a portion of said frame constituting said stop means which
is contacted by said arm.
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22. An oven door comprising spaced apart outer and inner
door panels with aligned window openings and at least one
transparent window pane in each window opening, a shield
positioned between said outer and inner door panels and
mounted on a transport mechanism for raising and lowering
said shield to and from a position which covers and shields
such transparent window pane in said outer door panel from
thermal radiation generated by an oven, and rotatable means
for locking said oven door shut which upon rotation to a
locking position activates said transport mechanism to raise
said shield to the window covering position, said rotatable
means being mounted in said door panels above said window
openings and having a lock portion extending outwardly from
said inner panel and an arm extending radially from said
rotatable means between said door panels and always remaining
above. said window openings, said lock portion being adapted
to engage a mating lock portion on an oven frame to lock
said oven door shut upon rotation of said rotatable means,
said arm being pivotally connected to an end of a link arm
which extends transversely of said oven door between said
door panels and always above said window openings, the other
end of said link arm being pivotally connected to a part of
said transport means, the arrangement of said arm relative
to said link arm being such that as said rotatable means is
rotated to lock said oven door shut, the distance between the
pivot point at said other end of said link arm and the axis
of rotation of said rotatable means increases and decreases
from a maximum with corresponding transverse movement of said
link arm, such transverse movement being translated into
raising said shield by virtue of said link arm's connection
with a part of said transport mechanism where said shield is
raised to its maximum vertical height when the oven door is
closed on an oven as said distance attains a maximum, stop
means for stopping rotation of said rotatable means at a
position after said maximum distance has been attained and
passed in the direction of rotation to the locking position,
the stop means being positioned to locate said shield over
such window pane and thereby retain said shield in the window
covering position.
23. An oven door of claim 22, said lock portion being a
lug which is adapted to engage an oven frame member to lock
said oven door shut during rotation of said rotatable member.
24. An oven door of claim 22, said transport means
comprising an L-shaped arm, a second link arm, and guide
means for guiding movement of said shield, said L-shaped arm
being pivotally mounted to the inner door panel and to one
side of said window openings, a first arm of said L-shaped
arm extending upwardly alongside said window opening with
its end pivotally connected to said link arm, a second arm of
said L-shaped arm extending across said oven door beneath said
window when the shield is in its lowered position, its end
being pivotally connected to said shield, said second link
arm having one end pivotally connected to said shield beneath
said second arm and having its other end pivotally mounted to
said inner door panel, the pivot points of said second arm and
second link arm being vertically aligned.
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25. An oven door of claim 24, wherein said guide means
comprises two rods extending upwardly in said door and
positioned to each side of said window openings, each end of
said shield having overturned edges which engage said rods,
the rod located on the side of the window on which said
L-shaped arm is pivoted being shaped to accommodate the
swinging movement of said shield as it is raised, the other
rod being straight where the overturned edge of the shield
sufficiently overlaps the ord to ensure continuous engagement
therewith.
26. An oven door of claim 25, wherein said rods are
covered with a friction reducing material.
27. An oven door of claim 24, wherein the top and bottom
portions of the shield are overturned to provide points of
connection to the shield which are invisible from the front
of the door.
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