U.S. patent number 3,712,287 [Application Number 05/074,815] was granted by the patent office on 1973-01-23 for door hinge.
This patent grant is currently assigned to United Filtration Corporation. Invention is credited to Frank P. Summers, Jr..
United States Patent |
3,712,287 |
Summers, Jr. |
January 23, 1973 |
DOOR HINGE
Abstract
A structure especially useful as an oven door hinge comprising a
spring which is self-contained within a casing and a lever system
which compresses the spring upon opening of the door to develop a
torque for counterbalancing.
Inventors: |
Summers, Jr.; Frank P.
(Medford, NJ) |
Assignee: |
United Filtration Corporation
(Chicago, IL)
|
Family
ID: |
22121847 |
Appl.
No.: |
05/074,815 |
Filed: |
September 23, 1970 |
Current U.S.
Class: |
126/191; 126/194;
16/289 |
Current CPC
Class: |
F24C
15/023 (20130101); E05F 1/1261 (20130101); Y10T
16/53834 (20150115); E05Y 2900/308 (20130101) |
Current International
Class: |
F24C
15/02 (20060101); F23m 007/00 () |
Field of
Search: |
;126/191,194
;16/190,145,146 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Dority, Jr.; Carroll B.
Claims
I claim:
1. A structure to be connected between two relatively rotatable
members for developing a torque for rotating the members in a
direction toward each other:
an elongated casing having means for connecting the casing to one
of the members;
a first arm having means for connecting the arm to the other of the
members;
first pivot means connecting the casing and the first arm and
providing for the same to be relatively rotatable toward and away
from one another;
a second arm;
second pivot means connecting the second arm to the first arm and
providing for the arms to be rotatable relative to one another;
a bracket slidably mounted on the casing;
third pivot means connecting the second arm and the bracket and
providing for the second arm to rotate relative to the bracket;
a compression spring on said casing, one end of the spring being
fixed to the casing and the other end engaging the bracket; and
the structure operating as follows: relative rotation of said
members in a direction away from one another to a position causing
the arms to relatively rotate, the latter motion causing the second
arm to push the bracket along the casing and thereby compress the
spring, the compression of the spring developing a counteracting
torque operating to rotate the members away from said position in a
direction toward each other.
2. A hinge structure providing for one member to rotate relative to
another in a vertical direction as between first and second
positions with the weight of the rotating member being
counterbalanced;
an elongated casing adapted to be mounted in a fixed position on
one member wherein the casing extends vertically;
a rotatable carrier arm having means for supporting the member to
be rotated;
pivot means connecting the casing and the carrier arm and providing
for the arm to rotate relative to the casing in a vertical
direction as between the first and second positions, the weight of
the member mounted on the carrier arm developing a torque to cause
the member and the carrier arm to rotate about the pivot in a
downward direction;
a lever arm;
pivot means connecting the lever arm to the carrier arm and
providing for the arms to be rotatable relative to one another;
a bracket slidably mounted on said casing;
pivot means connecting the lever arm and the bracket and providing
for the same to be rotatable relative to one another; and
a compression spring on said casing, one end of the spring being
fixed to the casing and the other engaging the bracket, relative
rotation of the carrier arm in a downward direction causing the
lever arm to push the bracket along the casing and thereby compress
the spring, the compression of the spring developing a torque on
the carrier arm to counter-balance the weight of the member.
3. A hinge structure for a cook oven having a hollow body with a
door providing access to the body, the hinge permitting the door to
rotate in a vertical direction relative to the body as between
closed, broil and open positions;
an elongated casing adapted to be mounted in a fixed position on
the body of the oven wherein the casing extends vertically;
a rotatable carrier arm having means for supporting an oven door
for rotation therewith;
pivot means connecting the casing and carrier arm and providing for
the arm and the door mounted thereon to rotate in a vertical
direction as between the closed, broil and open positions, the
weight of the door developing a torque to cause the door and the
carrier arm to rotate about the pivot in a downward direction;
a lever arm;
pivot means connecting the carrier arm and the lever arm and
providing for the arms to be rotatable relative to one another;
a bracket slidably mounted on the casing;
pivot means connecting the lever arm and the bracket and providing
for the same to be rotatable relative to one another and to provide
for relative sliding motion as between the bracket and the lever,
the pivot comprising a pin mounted on the bracket and a slot on the
lever arm within which the pin is disposed;
means on said carrier arm forming a closed detent and also forming
a broil detent, the detents to be respectively engaged by a cam
roller for establishing the closed and broil positions of the
carrier arm;
a cam roller on said pin for engaging the detents respectively in
the closed and the broil positions; and
a compression spring on the casing, one end of the spring being
fixed to the casing and the other engaging the bracket and
operating to push the bracket, the pin and cam roller along the
casing in a direction toward the lever arm.
4. A construction in accordance with claim 3 wherein, for the open
position of the carrier arm, the pivot means connecting the lever
arm and the bracket and the pivot means connecting the carrier arm
and the casing lie along a straight line and the pivot means
connecting the cam and lever arms lies outside of the line in a
direction whereby the spring develops a torque on the carrier arm
tending to rotate the arm in a downward direction and further
including stop means defining the open position.
5. A construction in accordance with claim 3 further including an
abutment on the pivot means connecting the casing and the carrier
arm and an abutment on the carrier arm, the two abutments engaging
to define the closed position.
6. A construction in accordance with claim 3 further including
abutment means on the casing and abutment means on the lever arm,
the two abutments engaging one another in the open position whereby
to define that position.
7. A construction in accordance with claim 3 further including a
flange on the lever arm engaging the casing in the open
position.
8. A construction in accordance with claim 3 further including an
abutment on said carrier arm which, in the open position, engages
the cam roller to define the open position.
9. A construction in accordance with claim 3 further including an
abutment on said carrier arm adapted to engage the lever arm in the
open position whereby to define the same.
10. A construction in accordance with claim 3 further
including:
a door latch arm pivotally mounted on said carrier arm;
a latch formed on the latch arm for engaging a keeper, the keeper
being formed on a door mounted on said carrier arm;
a spring normally biasing the latch arm to rotate so that the latch
is engaged with the keeper whereby in the open position the door
cannot be removed from the carrier arm;
a cam formed on the latch arm; and
a second cam roller on said pin adapted to be engaged by the cam on
the latch arm when the door is in the detent position to rotate the
arm so as to disengage the latch from the keeper whereby the door
can be removed from the arm.
11. A hinge structure for a cook oven having a hollow body with a
door providing access to the body, the hinge permitting the door to
rotate in a vertical direction as between open and closed
positions;
an elongated casing adapted to be mounted in a fixed position on
the body of the oven wherein the casing extends vertically;
a rotatable carrier arm having means for supporting an oven door
for rotation therewith;
pivot means connecting the casing and carrier arm and providing for
the arm and the door to rotate in a vertical direction as between
open and closed positions;
a bracket slidably mounted on the casing;
a compression spring on the casing, one end of the spring being
fixed to the casing and the other engaging the bracket;
means connected between the carrier arm and the bracket to cause
the bracket to slide along the casing with rotation of the carrier
arm;
a door latch lever arm pivotally mounted on said carrier arm;
a latch formed on the latch arm;
a keeper for the latch formed on the door;
a spring normally biasing the latch arm to rotate to disengage the
latch from the keeper whereby in the detent position the door can
be removed from the carrier arm;
a cam formed on the latch arm; and
a cam roller on the bracket and adapted to be engaged by the cam on
the latch arm when the door is in the open position to rotate the
arm so as to insert the latch in the keeper whereby to prevent the
removal of the door.
12. A hinge structure for a cook oven having a hollow body with a
door providing access to the body, the hinge permitting the door to
rotate in a vertical direction relative to the open body as between
closed and open positions, the weight of the door being
counterbalanced during the movement and the structure
comprising:
an elongated casing adapted to be mounted in a fixed position on
the body of the oven wherein the casing extends vertically;
a rotatable carrier arm having means for supporting an oven door
for rotation therewith;
pivot means connecting the casing and the carrier arm and providing
for the arm and the door mounted thereon to rotate in a vertical
direction as between closed and open positions, the weight of the
door developing a torque to cause the door and carrier arm to
rotate about the pivot in a downward direction;
a lever arm;
pivot means connecting the lever arm to the carrier arm and
providing for the arms to be rotatable relative to one another;
a bracket slidably mounted on said casing;
pivot means connecting the lever arm and the bracket and providing
for the arms to be rotatable relative to one another;
means on said lever arm to accept one end of a tension spring, the
other end of which is adapted to be connected to the body of the
oven;
rotation of the carrier arm in a downward direction causing the
lever arm to rotate on the carrier arm and slide the bracket along
the casing, the movement of the lever arm being resisted by the
tension spring, the tension of the spring developing a torque on
the carrier arm to counterbalance the weight of the door.
13. A construction in accordance with claim 1 having a construction
whereby the members when moved relatively apart to a predetermined
position, the first and third pivot means lie in the same straight
line and the second pivot means lies outside of the line and the
said pivot positions causing the torque developed by the spring to
move the members relatively in a direction away from one
another.
14. A hinge structure for a cook oven having a hollow body with a
door providing access to the body, the hinge permitting the door to
rotate relative to the body in a vertical direction as between open
and closed positions, the hinge comprising:
an elongated casing adapted to be mounted in a fixed position on
the body wherein the casing extends vertically and mounts the hinge
on the oven;
a rotatable carrier arm constructed to support an oven door for
rotation therewith;
pivot means connecting the casing and the carrier arm and providing
for the arm to rotate relative to the casing in a vertical
direction as between the open and closed positions; to provide for
the door to be rotatable as between the open and closed
positions;
a lever arm;
pivot means connecting the lever arm to the carrier arm and
providing for the arms to be rotatable relative to one another;
a bracket slidably mounted on said casing;
pivot means connecting the lever arm and the bracket and providing
for the same to be rotatable relative to one another;
a compression spring mounted on the casing, one end of the spring
being fixed to the casing and the other end engaging said bracket
and the force of said spring being transmitted to the carrier arm
via the bracket and lever arm; and
the parts operating as follows: when the carrier arm rotates toward
the open position, the lever arm also rotates and the bracket
slides along the casing in a direction whereby the spring is
compressed; and when the carrier arm rotates toward the closed
position, the lever also rotates and the bracket slides along the
casing in a direction whereby the spring expands.
Description
This invention is a substantial improvement in the hinge structure
of U.S. Pat. No. 3,503,380.
The hinge of the present invention not only provides various
advantages of the hinge of U.S. Pat. No. 3,503,380 but additionally
has structural features which extend the versatility and increase
the operating life of the hinge and adapt the same for use in other
applications such as door closures.
One of the objects of the invention is to provide a hinge structure
of the kind in question which uses a lever system to compress the
spring and thereby eliminate cam wear, the elimination of wear
being condusive to prolonged life, reduced maintenance and smoother
operation.
Another object of the invention is to provide a hinge structure of
the kind in question which has a lever and pivot system which will
lock the oven door in open position and thereby eliminate
dependence on the weight of the door to maintain the same in open
position.
Another object of the invention is to provide a hinge structure of
the kind in question having a lever system interposed between the
compression spring and the oven door supporting arm, the lever
system operating to compress the spring upon opening of the door so
as to develop a counterbalancing force and which also provides for
detenting of the door in the broil and in the closed positions.
Another object of the invention is to provide a hinge structure of
the kind in question which by a simple interchange of compression
springs, is adapted for use with either heavy or with the light
oven doors, the spring change having no impairing effect on any of
the other features of the structure.
Another object of the invention is to provide a hinge of the kind
in question which is especially useful for very heavy oven doors by
virtue of the structure which, when the door is in the open
position, provides a wide bearing area on the hinge casing to
thereby form a rigid support not only for the door itself but
additionally permits the door to be used as a platform by the
housewife when removing (or inserting) heavy articles such as
roasts from the oven.
Another object of the invention is to provide a hinge structure of
the kind in question which can be used with either the built-in or
the free standing type oven without any substantial modifications
of parts.
Preferred forms of the invention will be described in connection
with the following drawings wherein:
FIG. 1 is a wide elevational view of a hinge structure embodying
the invention, the hinge being shown in the oven door open
position.
FIG. 2 is an elevational view looking to the left in FIG. 1.
FIGS. 3 and 4 are elevational views of the hinge of FIG. 1
respectively showing the hinge in the broil and in the closed
position.
FIG. 5 is a fragmentary view of a modified version of the hinge
structure of FIG. 1 which is particularly useful in connection with
heavy oven doors.
FIG. 6 is a rear view looking to the left of FIG. 5.
FIG. 7 is a fragmentary view of FIG. 5 with the hinge in the broil
position.
FIG. 8 is a modified version of the hinge of FIG. 1 especially
useful for heavy door applications, the hinge being in the oven
door open position.
FIG. 9 is a rear elevational view looking toward the left in FIG.
8.
FIG. 10 is a fragmentary view of FIG. 8 with components in the
broil position.
The conventional cook oven has a hollow body with an access door
which is hinged on the bottom. The door is rotatable in a vertical
direction as between a closed position wherein the door extends
vertically (to seal off the oven) and an open position wherein the
door extends horizontally so as to provide free access to the
interior of the oven. Most of the conventional ovens require a
broil position wherein the door extends at an angle to the vertical
so as to leave a small opening between the top of the door and top
of the oven. Ordinarily in the broil position the door is removable
for cleaning purposes and the like.
The hinge of the present invention relates to an oven having the
open, broil and closed positions. It will be understood, of course,
that a pair of hinges are used, one on each side of the door.
With reference to FIG. 1 the hinge structure includes an elongated
casing 1 which is adapted to be fixed in the frame of a free
standing or a built-in type oven. The casing is U-shaped in cross
section and the back of the casing (FIG. 2) is provided with a pair
of inwardly extending flanges 2 and 3.
A carrier arm is indicated at 4. The carrier arm mounts the oven
door indicated by dot-dash lines d. Preferably the mounting is done
by the arm being inserted within a socket indicated by dotted line
s formed in the door. A pivot bracket 5 is mounted directly on the
bottom of the casing 1 and has a pivot means 6 which connects the
casing and the carrier arm and provides for the arm (and door) to
rotate as between the open position of FIG. 1, the broil position
of FIG. 3 and the closed position of FIG. 4. A lever arm is
indicated at 10 and a pin 11 operating within the elongated slot 12
on the lever arm forms a pivot means which interconnects the lever
arm and the carrier arm and provides for the arms to be relatively
rotatable.
Disposed within the casing 1 is a bracket 13. The bracket is
slidable up and down the casing. The bracket carries pin 14
operating within an elongated slot 15 formed on the lever arm. The
pin and slot arrangement provides a pivot means which interconnects
the lever and bracket arm and provides for the lever and bracket to
be relatively rotatable. The pin 14 operating within the slot 15
performs additional functions which will be described later.
The open position of the door is defined by the stops 16 and 17 on
the lever arm 10, the stop 16 being engaged with the pivot bracket
6 and the stop 17 being engaged with the flange 2.
A compression spring 18 is disposed within the casing 1, the bottom
end of the spring engages the bracket 13 and the top end is fixed
to the casing by its engagement with the spring retainer 20.
A latch arm 21 is pivotally connected to the carrier arm as by the
pivot 22. The latch arm has a latch 23 and a spring 24 biases the
latch arm so that the latch 23 extends outwardly as shown. The
outward position of the latch arm is determined by the boss 23a on
the latch arm engaging the bottom of the aperture 4a on the carrier
arm. The function of the latch 23 is to project into a slot or
keeper k on the door socket s and prevent the door from being
pulled off from the carrier arm in the open position. The latch is
moved out of the keeper in the broil position as will be explained
later. For a typical door-socket-oven arrangement of the kind
mentioned reference may be had to U.S. Pat. 3,505,380.
The structure of the hinge provides several distinct functional
advantages when the hinge is in the open position. These are
commented on following.
The pivot arrangement provides that the door to be automatically
locked in the open position. It will be apparent from an inspection
of FIG. 1 that the force of the spring 18 is transmitted through
the bracket 13, the pin 14 and thence to the lever arm 10 by virtue
of the pin 14 being bottomed in the slot 15. Also, it will be
observed that the centers of the pivots 6 and 14 lie along the same
straight line, for example, the line L and that the center of the
pivot 11 lies outside of the straight line L. Thus, the force of
the spring tending to move the lever arm 10 downwardly will
(through the medium of pivot 11 acting in the slot 12) tends to
cause the carrier arm 4 to rotate counterclockwise. The carrier arm
4 will pull on the leverl arm 10 and thus firmly engage the stops
16 and 17. With this feature it is unnecessary to depend upon the
weight of the door to maintain itself in the open position.
Another advantage in the open position is the stop arrangements
which not only define the open position but provide a wide bearing
area for increasing the rigidity. The stop 16 bears against the
pivot bracket 5 which in turn has a section 25 engaging the bottom
of the casing 1. The bearing area therefore comprises the area over
which the pivot bracket contacts the casing. Additionally, the stop
17 which bears against the flange 2 augments the over-all bearing
area.
With the two point stop as described, not only does the hinge form
a rigid support for even the heaviest of doors, but in addition
permits the door to serve as a platform for use by the housewife
when removing or inserting heavy food items.
In the movement from the open position of FIG. 1 to the broil
position of FIG. 3, the hinge operates to counterbalance the door.
This is commented on following:
As understood in the trade, the term counterbalancing means a force
which may be of a magnitude simply to overcome part of the door
weight so that the door is easier to swing upwardly or downwardly
or may refer to a force of magnitude which is enough to effectively
cancel out the weight of the door, whereby the door will remain
stationary if placed in any position between open and broil.
As the carrier arm is moved counterclockwise the pivot arrangement
11 causes the lever arm to slide downwardly in the casing. During
the first part of the movement the spring, of course, is compressed
at its maximum and therefore exerts a greater amount of force to
counterbalance the weight of the door. As the carrier arm and door
move up, the effective weight of the door becomes less and the
spring force also becomes less by that the lever arm moves down to
let the spring expand.
The counterbalance effect is accomplished through the lever system
comprising the carrier and lever arm. The force of the spring is
not transmitted via a cam surface as is in U.S. Pat. No. 3,503,380.
Thus, one of the primary advantages of this arrangement is the
elimination of cam wear. Consequently, the hinge is much smoother
in operation, its operating life is extended and there is no
maintenance due to cam wear.
The carrier arm and door are continually counterbalanced until
reaching the broil position of FIG. 3. When the carrier arm has
rotated clockwise closely adjacent to broil position, the carrier
arm surface 30 picks up the cam roller 31 which then moves into the
broil detent 32. The pin 14 (carrying roller 31) is spaced away
from the bottom of slot 15 as indicated in FIG. 3. At this point it
will be seen that the pressure of the spring 18 acting on the
bracket 13, pin 14 and cam roller 31 exerts a force directly on the
broil detent 32 so that the cam roller is tightly engaged. The door
therefore is firmly held in the partially open or broil position.
The structure of the slot 15 to accomplish this purpose therefore
is of importance in the operation of the hinge.
In the broil position the oven door can be removed as explained
following.
In the broil position the cam surface 33 on the latch arm contacts
the latch roller 34. The latch arm is rotated clockwise against the
force of the spring 24. As a consequence, the latch 23 is extracted
from the keeper. This allows the door to be pulled off.
In those instances where it is desired that the door remain
permanently attached, the latch bar is not used and screw means
such as the screw 35 fixes the arm in the door socket.
As the carrier arm is moved from the boil position of FIG. 3 to the
closed position of FIG. 4 the slot 15 permits the lever arm to move
while also permitting the cam roller 31 to remain in contact with
the carrier arm. When the carrier arm reaches the closed position
the abutment 36 on the carrier arm contacts the abutment 37 on the
pivot bracket. The engagement defines the closed position. At this
time the cam roller 31 is on contact with the closed detent 38.
The pin 14 (carrying the roller 31) is spaced away from the bottom
of the slot 15. The pressure of the spring 18 acting on the bracket
13, pin 14 and cam roller 31 exerts a force directly on the closed
detent 38. Thus, the cam roller 31 is tightly engaged and the door
is firmly held in the closed position.
From the foregoing description it will be apparent from those
skilled in the art that the compression spring 18 can be of a size
which is compatible with the amount of force necessary for the
counterbalancing function. Thus, the spring can be much heavier or
lighter or can even be compounded to provide the necessary
counterbalancing force. It will be apparent that regardless of the
size or force developed by the spring for counterbalancing the
lock-out function in the open position and the detenting functions
in the broil and closed positions are not affected.
The modification shown in FIGS. 5-7 is essentially the same in
function and operation as the hinge just described with the
principal exception that the carrier arm rather than the lever arm
is used to attain wide bearing support in the open position. Thus,
with particular reference to FIG. 7 it will be seen that the
carrier arm 40 has an extension 41 having a hook-like end 42. When
the carrier arm is in the open position of FIG. 5 it will be
observed that the hook-like end 42 makes contact with the cam
roller 43. This engagement defines the open position. The force
exerted by the hook-like end 42 on the cam roller is transmitted
through the roller, through the pin 44 to the bracket 45 and thence
into the bottom part of the casing 46. In this way the thrust or
force is distributed over a wide area on the casing.
FIGS. 8, 9 and 10 show a further modification which in function and
operation is substantially the same as the hinge in FIG. 1 except
that the carrier arm is modified to provide for a wide bearing in
the open position. The carrier arm 50 has an extension 51 on which
is a stop 52. When the hinge is in the open position as indicated
in FIGS. 8 and 9, the stop 52 engages the lever arm 53, the force
generated by the stop 52 on the lever arm 53 is transmitted from
the lever arm to the pin 54, into the bracket 55 and thence to the
bottom of the casing 56. The open position is defined by the
engagement of the stop 52 and lever arm 53.
Returning to the hinge structure of FIGS. 1, 2 and 3 the combined
lever arm structure has the additional advantage of adapting the
same for use in free standing and built-in ovens without change.
Thus, it will be observed that in any of the open, broil or closed
positions of the hinges the carrier arm and/or lever arm extends
substantially flush with the bottom of the casing. There is no
substantial extension of any parts below the bottom of the casing.
In this way it is possible for the hinge structure to fit inside of
the oven frame work even in those cases where there is an overhand
without modification for downwardly extending parts.
Another important feature of the invention is the fact that the
structure is easily and readily adaptable for use in those
applications where the stove manufacturer desires to use the
conventional tension spring. The manner in which this is
accomplished is explained following.
With reference to FIG. 1 the hinge structure is assembled without
the compression spring 18, the spring retainer 20, the latch arm 21
and the spring 24. When the modified structure is set up in the
oven, the end of the tension spring can be connected to the lever
arm by inserting the spring hook into the aperture 60 in the lever
arm 10.
In the tension spring arrangement just described, it is important
that the slot 15 be configured so that in the closed position the
spring will pull down on the lever arm and cause the stop end of
the slot to engage the pin 14. This will pull the cam roller down
tight against the closed detent. Also, with this arrangement, it is
preferred that the slot 12 be somewhat elongated. This provides for
a smoother operational characteristic of the hinge.
In certain instances it may be desirable that the door be somewhat
overbalanced, that is to say, when moved from the open position
upwardly the spring exerts a force which is greater than the force
necessary for counterbalancing and thus tend to assist the door in
its upward rotation. For such purposes, of course, the spring is
selected to produce the desired result.
Before closing, it is pointed out that the lever system for moving
the compression spring, particularly the feature of the minimum
outward extension of the lever arm, nicely adapts the structure for
use in other applications, for example, door closures. For this
purpose means are provided to attach the casing to a door jam
together with means to connect the carrier arm to the door
including a sliding connection to take into account the effect of
the door hinge axis and the pivot axis being off-set. In such an
application the spring is chosen so that as the door is moved to an
open position, a force will be exerted tending to cause the door to
close.
* * * * *