U.S. patent application number 10/276370 was filed with the patent office on 2003-09-18 for hinge for a stove door.
Invention is credited to Gronbach, Lina.
Application Number | 20030172920 10/276370 |
Document ID | / |
Family ID | 26008512 |
Filed Date | 2003-09-18 |
United States Patent
Application |
20030172920 |
Kind Code |
A1 |
Gronbach, Lina |
September 18, 2003 |
Hinge for a stove door
Abstract
The invention relates to a hinge for a stove door, comprising a
housing (1) in which a plug-in part (2) is rotationally (10)
mounted. In order to be able to easily influence the torque
produced by the spring, a spring guide (3) which is loaded by a
spring (6), preferably a pressure spring, is provided, said spring
guide being fitted with roller (15) that is guided through a curved
section (9) of the plug-in part (2).
Inventors: |
Gronbach, Lina; (Eiselfing,
DE) |
Correspondence
Address: |
Rocco S Barrese
Dilworth & Barrese
333 Earle Ovington Boulevard
Uniondale
NY
11553
US
|
Family ID: |
26008512 |
Appl. No.: |
10/276370 |
Filed: |
May 13, 2003 |
PCT Filed: |
February 15, 2002 |
PCT NO: |
PCT/EP02/01645 |
Current U.S.
Class: |
126/197 |
Current CPC
Class: |
E05D 11/105 20130101;
F24C 15/023 20130101; E05D 7/12 20130101; E05Y 2800/296 20130101;
E05Y 2900/308 20130101; E05F 1/1261 20130101; E05Y 2201/682
20130101; E05Y 2201/638 20130101; E05Y 2201/604 20130101; E05F
1/1276 20130101; E05Y 2600/46 20130101; E05D 11/06 20130101 |
Class at
Publication: |
126/197 |
International
Class: |
F23M 007/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 15, 2001 |
DE |
101 07 136.1 |
Oct 26, 2001 |
DE |
101 52 907.4 |
Claims
1. A hinge for a stove flap with a casing (1), to which is pivoted
(10) a plug-in part (2), characterized by a spring guide (3) loaded
by a spring (6) and provided with a roll (15), which is guided
through a cam plate (9) of the plug-in part (2).
2. The hinge according to claim 1, characterized in that the spring
(6) is a compression spring.
3. The hinge according to claim 1 or 2, characterized in that the
roll (15) is provided on an outwardly pointing bracket (14) of the
spring guide (3).
4. The hinge according to one of the preceding claims,
characterized in that the cam plate (9) has the inclination (16)
that generates the required closing force in the closed position of
the hinge.
5. The hinge according to one of the preceding claims,
characterized in that the cam plate (9) has a neutral section (18)
with the hinge opened a specific distance, e.g., about
20.degree..
6. The hinge according to one of the preceding claims,
characterized in that the cam plate (9) is designed in such a way
that the spring force generated by the cam plate progression
essentially offsets the opening torque of the stove flap.
7. The hinge according to one of the preceding claims,
characterized in that the spring guide (3) is routed into the
casing (1).
8. The hinge according to claim 7, characterized in that the spring
guide is routed into the casing (1) via a support (5), preferably a
plastic support.
9. The hinge according to one of the preceding claims,
characterized in that the lever arm force (h) of the roll (15) can
be varied relative to the pivot axis (10) of the plug-in part
(2).
10. The hinge according to one of the preceding claims,
characterized in that the spring guide (3) has a guide pin (8)
routed in an additional cam plate (4) of the casing (1).
11. The hinge according to one of the preceding claims,
characterized in that the pre-stress of the spring (6) can be
varied.
12. The hinge according to one of the preceding claims,
characterized in that a stop (12) for the spring (6) can be
adjusted, preferably by means of a nut.
13. The hinge according to one of the preceding claims,
characterized in that a locking part (25) is connected with the
plug-in part (2).
14. The hinge according to claim 13, characterized in that the
locking part (25) can be pivoted (26).
15. The hinge according to claim 14, characterized in that the
pivot axis (26) of the locking part (25) is shiftable (27).
16. The hinge according to one of claims 13 to 15, characterized in
that the locking part (25) has a wedge (28).
17. The hinge according to one of claims 13 to 16, characterized in
that the locking part (25) has an actuating projection (31).
18. The hinge according to one of claims 13 to 17, characterized in
that the locking part (25') has a face (41) that forms a stop
surface.
19. The hinge according to claim 18, characterized in that the
distance between the face (41) and the pivot axis (26') of the
locking part (25') becomes greater as the locking part (25')
increasingly pivots.
20. The hinge according to claim 18 or 19, characterized in that
the face (41) is curved.
21. The hinge according to one of claims 18 to 20, characterized in
that the face (41) has a circular arc contour, wherein the midpoint
(m) of the circular arc (42) is spaced apart (a) from the midpoint
(M) of the pivot axis (26') of the locking part (25').
22. A stove flap and/or stove, characterized by a hinge according
to one of claims 1 to 21 and a dummy hinge (46) with a casing (1),
to which a plug-in part (2) is pivoted (10).
23. The stove flap and/or stove according to claim 22,
characterized in that the dummy hinge comprises a spring, in
particular a leg spring (47), which is mounted to the casing (1)
and to the plug-in part (2).
24. The stove flap and/or stove according to claim 22 or 23,
characterized in that the dummy hinge (46) comprises the features
of one or more of claims 13 to 21.
Description
[0001] The invention relates to a hinge for a stove flap, which can
also be referred to as a "stove hinge", according to the preamble
to claim 1.
[0002] Such stove hinges are already known in the art. They
generally have a casing to which is pivoted a plug-in part. The
casing is secured to the stove flap. The plug-in part is inserted
into the stove or stove casing, e.g., a side wall, or otherwise
fastened there. However, it is also possible to secure the casing
to the stove and then plug-in part to the stove flap. The casing
can essentially be shaped like a box. The pivot axis can be in a
corner of the casing, e.g., in a lower outside corner, in
particular at the location of the casing facing away from the
segment of the plug-in part extending out of the casing.
[0003] Stove hinges of this kind often have a spring intended to
offset the weight of the stove flap. The stove flap is normally
pivoted to a horizontal axis on the front side of the stove,
wherein the stove flap is situated vertically over the pivot axis
in the closed position, and can be pivoted to the outside up to an
angle of 90.degree.. During this pivoting process, the opening
torque of the stove flap increases in essentially a sinusoidal
pattern. The spring of the stove hinge makes it possible to offset
this opening torque (door torque) of the stove flap. In addition,
the spring can also generate a certain locking force of the stove
flap in its closed position.
[0004] The object of the invention is to propose a stove hinge with
which torque generated by the spring can be easily influenced.
[0005] According to the invention, this object is achieved by the
characterizing features of claim 1. The hinge encompasses a spring
guide loaded by a spring. This spring is preferably a torsion or
flat spiral spring. The spring guide is provided with a roll guided
into a cam plate (pitch cam, guide track) of the plug-in part.
However, it is here not absolutely necessary that the roll execute
a rolling motion. Instead of an actual roll, use can also be made
of another guide element that is rigid in design and can pivot
while sliding along the cam plate or guide track. The roll or other
guide element can be guided into the camp late or guide track.
However, it can also traverse the cam plate or guide track in
another manner.
[0006] The cam plate layout can influence the torque exerted by the
hinge on the stove flap. This torque depends on the progression and
inclination of the guide track, and the achieved rotational angle
or opening angle. The initial stress of the spring is controlled
over the progression of the guide track. Special settings, lock-in
positions and/or closure moments can be achieved via the
inclination of the guide track.
[0007] Advantageous further developments are described in the
subclaims.
[0008] The spring is preferably designed as a compression spring. A
compression spring, in particular a torsion spring, placed under
pressure is less susceptible to vibration than a tensioned spring,
so that less disturbing noises are generated. However, a tension
spring can also be used.
[0009] Another advantageous further development is characterized in
that the roll is provided on an outwardly facing bracket of the
spring guide. The roll is preferably located outside the hinge
casing. As a result, the distance, and hence the lever arm force,
between the pivot axis of the hinge and roll can be increased,
making it possible to better utilize the force of the spring.
Accordingly, it is also possible to use smaller springs and make do
with lower spring forces. Lowering the spring force enables weaker
and smaller hinges, since the hinge components now just have to
absorb lower forces.
[0010] In another advantageous further development, the cam plate
has an inclination in the closed position of the hinge that
generates the required closing force. Legal regulations stipulate
that stove flaps must reach a specific closing force. This closing
force can be easily generated via the corresponding inclination of
the cam plate.
[0011] Another advantageous further development is characterized in
that the cam plate has a neutral section at a certain open position
of the hinge. In this case, the opening angle is preferably 200,
forming the so-called "grill stop". However, the angle can also lie
between 10.degree. and 30.degree., and even exceed this in specific
instances. The neutral section of the cam plate triggers the "grill
stop" of the stove flap at a predetermined opening angle.
[0012] The cam plate is preferably designed in such a way that the
spring force generated by the cam plate progression essentially
offsets the opening torque or door torque of the stove flap. If the
cam plate has an inclination generating the required closing force
in the closed position of the hinge, and/or if the cam plate has a
neutral section at a certain open position of the hinge, the
mentioned advantageous further development can be designed in such
a way that the spring force generated by the cam plate progression
essentially offsets the opening torque of the stove flap in those
areas lying outside the closed position and/or specific open
position.
[0013] The spring guide is preferably guided in the casing. This
guiding mechanism is preferably achieved using a support, wherein
the support preferably consists of plastic or some other suitable
material.
[0014] Another advantageous further development is characterized in
that the lever arm force of the roll can be varied relative to the
pivot axis of the plug-in part. It is advantageous for the spring
guide to have a guide pin that extends into another cam plate of
the casing. However, it is also possible to provide the guide pin
in the casing and the additional cam plate in the spring guide.
Changing the length of the lever arm force between the roll and
pivot axis that can be generated by moving the spring guide
relative to the casing makes it possible to additionally influence
the torque exerted by the hinge on the stove flap. The spring guide
can be moved via the other cam plate (pitch cam, guide track), so
that the lever arm of force of the acting spring force can be
varied relative to the fulcrum of the plug-in part. The torque is
controlled by superposing the effects of the cam plate of the
plug-in part and additional camp plate. This makes it possible to
expand the range of influence on the torque. Further, the physical
size of the hinge can be reduced.
[0015] The initial stress of the springs can be variable. It is
advantageous that a stop be adjustable for the springs. This stop
can be designed as a nut, or encompass a nut, so that turning it
can produce a change in the initial spring stress. The arrangement
is preferably such that the nut or other component can be adjusted
by hand to vary the initial spring stress. The hinge can be
adjusted to various stove flaps by changing the initial spring
stress.
[0016] Another advantageous further development is characterized in
that a locking part is connected with the plug-in part. The locking
part is preferably pivoted. It is advantageous for the pivot axis
of the locking part to be shiftable. The locking part can have a
wedge. The locking part preferably has an actuating projection.
[0017] In another advantageous further development, the locking
part has a face that forms a stop surface. As a result, a reliable
locking effect can be achieved even if the dimensions of the
locking part and/or parts interacting with it deviate from the
prescribed values due to manufacturing tolerances and/or wear.
[0018] It is advantageous if the distance between the face and
pivot axis of the locking part widens as the locking part
increasingly swivels out. In this way, the locking effect will be
sufficient even when if distance between the pivot axis and the
part interacting with the face of the locking part, e.g., a corner
of the counter-bearing, should be greater than prescribed due to
manufacturing tolerances, and or become greater over time due to
instances of wear.
[0019] The face is preferably curved. In an advantageous further
development, the face has a contour shaped like a circular arc, or
at least essentially shaped like a circular arc, wherein the
midpoint of the circular arc is spaced apart from the pivot axis of
the locking part. As a result, the distance between the face and
pivot axis of the locking part can widen as the locking part
increasingly swivels out.
[0020] The invention also relates to a stove flap and/or a stove.
In previously known stove flaps, it is often necessary to use two
hinges. If the stove flap needs a counterweight, each of the hinges
in previously known solutions must have a counterweight comprising
a relatively strongly dimensioned spring.
[0021] Another object of the invention is to propose a simplified
stove flap.
[0022] According to the invention, this object is achieved by a
hinge according to the invention and a dummy flange with a casing
to which a plug-in part is pivoted. The hinge according to the
invention makes it possible to completely implement the
counterweight. The arrangement can be such that the entire
counterweight for the stove flap is achieved using a hinge
according to the invention. A counterweight is then no longer
required for the second hinge of the stove flap. Accordingly, the
second hinge of the stove flap requires no hinge according to the
invention, but rather only a simplified hinge, or a "dummy hinge",
which comprises a casing to which a plug-in part is pivoted. The
second hinge, or dummy hinge, requires no spring-loaded spring
guide provided with a roll guided through a cam plate of the
plug-in part. This results in a simplification and cost
savings.
[0023] It is advantageous if the dummy hinge comprises a spring, in
particular a leg spring, which is mounted on the casing and on the
plug-in part. This spring can be used to generate a closing torque.
This is advantageous particularly when the dummy hinge has a
locking device. In this case, the spring or leg spring can generate
a small closing torque to maintain the function of the locking
device.
[0024] It is advantageous if the dummy hinge has one or more
features of the locking device. Accordingly, the plug-in part of
the dummy hinge preferably has connected to it a locking part,
preferably pivoting, wherein the pivot axis of the locking part is
preferably shiftable. The locking part of the dummy hinge can have
a wedge. It can also have an actuating projection. It is
advantageous if the locking part of the dummy hinge has a face
forming a stop surface, wherein the distance between the face and
the pivot axis of the locking part preferably widens as the locking
part increasingly swivels out. The face is preferably curved.
[0025] The face can have a contour shaped like a circular arc, or
essentially shaped like a circular arc, wherein the midpoint of the
circular arc is spaced apart from the pivot axis of the locking
part.
[0026] Embodiments of the invention will be explained in detail
below based on the attached drawing. The drawing shows:
[0027] FIG. 1 the hinge in the closed position, rear view,
[0028] FIG. 2 the hinge according to FIG. 1 in the closed position,
side view,
[0029] FIG. 3 the hinge according to FIG. 1 and FIG. 2 in the open
position, at an opening angle of about 45.degree., side view,
[0030] FIG. 4 the hinge according to FIGS. 1-3 in the open
position, at an opening angle of essentially 90.degree., side
view,
[0031] FIG. 5 the hinge according to FIGS. 1-4 in the closed
position, top view,
[0032] FIG. 6 the progression of torque as a function of the
opening angle of the hinge,
[0033] FIG. 7 a modification of the hinge with a locking part in
the locked position,
[0034] FIG. 8 the hinge according to FIG. 7 in a partially open
position,
[0035] FIG. 9 the hinge according to FIG. 7 and 8 in the locked
position,
[0036] FIG. 10 a modification of the hinge shown on FIGS. 7 to 9
with a locking part, which has a face forming a stop surface, in a
latched position with partially opened stove flap,
[0037] FIG. 11 the hinge according to FIG. 10 in a partially open
position,
[0038] FIG. 12 the hinge according to FIGS. 10 and 11 in the locked
position,
[0039] FIG. 13 a section from FIG. 10, magnified view,
[0040] FIG. 14 a dummy hinge in the closed position, rear view,
[0041] FIG. 15 the dummy hinge according to FIG. 14 in the open
position, side view, and
[0042] FIG. 16 the dummy hinge according to FIGS. 14 and 15 in the
closed position, side view.
[0043] The casing 1 of the hinge, which can also be referred to as
the hinge body, can be built into the stove doors. However, a
reverse arrangement could also be selected, in which the casing 1
of the hinge is built into the stove or otherwise attached to the
stove (not shown in the drawings). A plug-in part 2 is secured to
the casing 1 so that it can pivot around an axis 10. The connection
to the stove is made via plug-in part 2, which is latched or
otherwise secured to the stove. The pivot axis 10 is situated in
the rear lower part of the casing 1, on the side of the casing 1
facing away from the plug-in part 2. The plug-in part 2 extends out
of the casing 1.
[0044] A spring guide 3 is incorporated in the casing 1. The spring
guide 3 encompasses a guide rod 11 that extends upwardly out of the
casing 1, and has a stop 12 at its upped end. A compression spring
6 is tensioned between this stop 12 and a plastic support 5. The
stop 12 can be designed as a nut (not shown in drawing), which can
be turned on a thread provided at the upper end of the guide rod 11
(also not shown in drawing), thereby making it possible to change
the pre-stress of the compression spring 6. In this case, the stop
12 designed as a nut can be adjusted using a tool, e.g., a
screwdriver, a wrench or an Imbus wrench. The nut can also be
designed as a wing nut or other hand-manipulated nut.
[0045] The plastic support 5 lies on the upper sealing surface of
the casing 1. It has a downwardly pointing part (not shown in
drawing), which lies in a corresponding recess in the upper end
surface 13 of the casing, and through which the guide rod 11 of the
spring guide 3 is routed.
[0046] The lower end of the spring guide 3 has an outwardly
pointing bracket 14, having secured to it a pin 7, around which a
roll 15 is pivoted.
[0047] In addition, a guide pin 8 is incorporated, in particular
pressed, into the spring guide 3, and guided in an additional cam
plate 4 provided in the casing 1. It is advantageous if the pin 8
lies deeper, i.e., closer to the roll 15, than shown on the
drawing, since the torque acting on the spring guide 3 then becomes
smaller. The lever arm force h between the axis 10 and roll 15
takes place over the progression of the additional cam plate 4. The
additional cam plate 4 is shaped like a longitudinal slit, which
runs straight and parallel to the direction of movement of the
spring guide 3 in the upper, longer area, and bends to the left,
i.e., away from the roll 15, in the lower end area in the manner
evident from FIGS. 2 to 4. As a result, the lever arm force h
diminishes to the completely open position shown on FIG. 4.
[0048] The plug-in part 2 accommodates a cam plate 9 through which
the roll 15 reaches, and in which this roll 15 is guided.
[0049] The beginning of the cam plate 9, i.e., the point where the
roll 15 is located, has an initial section 16 with a certain
inclination when the hinge assumes the closed position shown on
FIG. 2, which generates a preset closing force.
[0050] This initial section 16 is followed by a convex section,
which can be referred to as a cam 17. Provided on the side of the
cam 17 facing away from the initial section 16 is a neutral section
18, which lies at a point on the cam plate 9 corresponding to an
opening angle of about 20.degree.. If the roll 15 lies in the area
of the neutral section 18, the stove flap is in a stable position
in which the opening torque (door torque) of the stove flap is
essentially exactly as high as the counter-torque generated by the
compression spring 6. In this position, the stove flap is in the
so-called grill stop.
[0051] The ensuing area 19 of the cam plate 9 is designed in such a
way that the spring force generated over this section 19
essentially offsets the opening torque of the stove flap.
[0052] This will be explained below based on FIG. 6. Recorded there
on the horizontal axis is the opening angle of the hinge, starting
with the opening angle 0.degree. (closed position; FIG. 2) to the
opening angle 90.degree. (completely open position; FIG. 4). The
torque is recorded in Nm on the vertical axis.
[0053] The bracket 20 represents the progression of the torque
generated by a stove flap with a weight of about 10 kg. This torque
increases in a sinusoidal pattern. It reaches its highest value at
a full opening angle of 90.degree..
[0054] The cam plate 21 shows the progression of the torque
generated by the hinge when opening the hinge. This torque has a
maximum of somewhat more than 7.5 Nm at the outset of the opening
process at an opening angle of about 5.degree.. The very steep
progression of the hinge torque up to this maximum is generated by
the inclination of the initial section 16 of the cam plate 9.
[0055] In the ensuing area, the hinge torque drops of considerably.
It reaches the cam plate 20 in the area of about 17.degree.. If the
stove flap is opened further, the torque of the hinge generated by
the spring force presented in the cam plate 21 essentially
corresponds to the opening torque of the stove flap presented in
the cam plate 20. This can be achieved by appropriately shaping the
section 19 of the cam plate 9.
[0056] When closing the stove flap, the torque generated by the
hinge passes through the cam plate 22, which lies deeper than the
cam plate 21 due to the hinge hysteresis. The cam plate 22 drops
below the cam plate 20 at about 18.degree., decreases to
approximately 0 Nm and again exceeds the cam plate 20 at about
13.degree.. The 18.degree. to 13.degree. range corresponds to the
grill stop, which assumes a stable position at the minimum of the
curve 22 i.e., at about 17.degree..
[0057] As an option, changing the control cam plates 21, 22 also
makes it possible to influence the stove flap in such a way that it
drops softly after opened at a specific angle, e.g., 60.degree.. In
this case, the cam plate 21 intersects the cam plate 20 at this
angle, e.g., 60.degree., and runs under the cam plate 20 at larger
angles.
[0058] By appropriately dimensioning the hinge, cam plates 21 and
22 can be made to run at essentially the same distance on either
side of the cam plate 20, as shown on FIG. 6. In a corresponding
manner, divergent hinge dimensions make it possible to lower or
lift cam plates 21 and 22, if needed.
[0059] Provided on the side of the plug-in part 2 in the lower part
of the casing 1 is a recess 24, which is interspersed by the
plug-in part 2 and the bracket 14 of the spring guide 3. As a
result, the roll 15 provided on the bracket 14 is located outside
the casing 1. This makes it possible to achieve a great distance,
and hence high lever arm force h, between the axis 10 and the roll
15. As a result of this high lever arm force, the compression
spring 6 can be dimensioned relatively weakly.
[0060] The force of the compression spring 6 is transmitted to the
roll 15 via the spring guide 3. The roll 15 runs in the cam plate 9
of the plug-in part 2. The shape of the cam plate 9 enables an
adjustment to the door torque in each open position. The neutral
section 18 adjacent to the cam 17 permits an intermediate stop
during the opening process or closing process ("grill stop").
[0061] The hinge is also suitable for stoves with very heavy doors.
In particular in stoves with a device for pyrolysis cleaning, the
doors or flaps are relatively heavy. They reach a weight of up to
14 kg.
[0062] The invention provides a hinge that makes do with a low
number of components. The hinge characteristics can be freely
selected via the shape of the cam plate 9. The torque can be offset
in any open position of the door or stove flap. In particular, the
arrangement can be such that the torque generated by the spring is
essentially exactly as high as the torque opening the door or flap.
The hinge according to the invention has a small structure. Because
a compression spring less susceptible to vibration than a tension
spring is used, no disturbing noises are produced.
[0063] The support or plastic support 5 further dampens vibrations
and noise.
[0064] The spring pre-stress can be variable. Since the spring
force is relatively low, the spring pre-stress can be adjusted by
hand. As a result, a hinge can be used for different stoves. The
hinge is adaptable to various stoves, or adjustable for different
stoves.
[0065] FIGS. 7 to 9 show a variation of the hinge, in which the
additional cam plate 4' lies deeper, i.e., closer to the roll 15,
than in the form of execution according to FIGS. 1 to 5. In
addition, the additional cam plate 4' is curved throughout in such
a way that the lever arm force h decreases as the hinge
increasingly opens. The additional cam plate 4' is curved in a way
that the extent of the decrease in the lever arm force h becomes
larger as the hinge increasingly opens.
[0066] For purposes of simplifying the drawing, FIGS. 7 and 9 do
not show the spring guide 3. Parts corresponding to those in the
form of execution according to FIGS. 1 to 5 are marked with the
same reference numbers.
[0067] In the variation according to FIGS. 7 to 9, a locking part
25 is connected with the plug-in part 2. The locking part has a
pivot axis 26 that is mounted in a guide 27 of the plug-in part 2
so that it can pivot and slide longitudinally. The locking part 25
can be pivoted around the pivot axis 26. The pivot axis 26 can be
shifted in the guide 27. The guide 27 is essentially straight.
[0068] The end of the locking part 25 lying opposite the pivot axis
26 has a wedge 28, which is formed by the lower contour 29
essentially shaped like a circular arc and the upper contour 30
also shaped essentially like a circular arc, and which narrows
proceeding away from the pivot axis 26. An upwardly pointing
actuating projection 31 is also provided on the locking part 25
between the pivot axis 26 and the wedge 28.
[0069] The casing 1 of the hinge is connected with the stove flap.
The plug-in part 2 is hung into a counter-bearing 32, which is
secured to the stove. The counter-bearing 32 has brackets 33 into
which an extension 34 of the plug-in part 2 engages. In addition,
the counter-bearing 32 has a bracket 35, on which the rounded outer
end 36 of the plug-in part 2 sits. As a result of the interaction
between the brackets 33 with the extension 34 and bracket 35 with
the end 36, the plug-in part 2 and hinge casing 1 connected thereto
along with the stove flap connected thereto are reliably held in
the position shown on FIG. 7 to 9 by the dead weight of the stove
flap. However, it is possible to move the plug-in part 2 out of the
brackets 33 and 35, namely by pivoting the plug-in part 2 relative
to the counter-bearing 32 in the clockwise direction. During this
movement, the extension 34 is moved out downwardly out of the area
between the brackets 33, while the rounded outer end 36 moves by
the bracket 35.
[0070] FIG. 7 shows the latched position of the hinge. The plug-in
part 2 provides a recessed support surface 37, whose contour
corresponds to the bottom surface 29 of the locking part 25. In the
latched position, the lower surface 29 of the locking part 25 sits
on the support surface 37. The upper surface 30 of the locking part
25 lies on the corner 38 of the counter-bearing 32. The wedge 28 of
the locking part 25 formed by the surfaces 29, 30 is clamped
between the support surface 37 and the corner 38. The pivot axis 26
of the locking part 25 lies in the central area of the guide 27,
somewhat outside the middle in the direction away from the axis 10,
as shown on FIG. 7. In this position, the wedge 28 of the locking
part 25 prevents the stove flap from lifting out. To lift out the
stove flap, the casing 1 of the hinge would have to be turned
counterclockwise, which is prevented by the wedge 28 between the
support surface 37 and the corner 38. The wedge 28 brings about an
automatic interlock, which prevents the stove flap from lifting
out. The wedge 28 cannot work itself loose. This precludes operator
errors, which otherwise could result in the stove flap being
inadvertently unhinged if lifted in a closed position.
[0071] However, it is possible to open the stove flap, i.e., pivot
the casing 1 around the axis 10. After a slight pivot, the
partially open position shown on FIG. 8 is reached. If the stove
flap is to be unhinged, the stove flap is opened further until an
opening angle somewhat larger than indicated on FIG. 9 is reached.
In this open position, the locking part 25 is pivoted
counterclockwise around the pivot axis 26 until it reaches the
position shown on FIG. 9. In this position, the locking part 25
extends through the slit 24 into the casing 1 of the hinge. The
latching lug 31 faces the axis 10. The stove flap is subsequently
pivoted along with the casing 1 somewhat toward the closed
position, until the locked position shown on FIG. 9 is reached. The
outside end surface of the locking part 25 lies on the edge 39
bordering the slit 24 from above. This prevents a further closing
of the hinge, i.e., a further pivot of the hinge clockwise around
the axis 10. If the stove flap is lifted in this locked positions
the plug-in part 2 is unhinged. The extension 34 of the plug-in
part 2 slides downward out of the brackets 33, and the stove flap
can be removed.
[0072] It can then be hung in again in a reverse movement. To
release the locking mechanism of the locking part 25, the stove
flap is opened a bit more by pivoting the casing 1 out of the
locked position shown on FIG. 9 counterclockwise around the axis
10. In this position, the locking part 25 can be pivoted clockwise
around the pivot axis 26. The locking mechanism is released as a
result, and the stove flap can be closed, i.e., the casing 1 can be
further pivoted clockwise around the axis 10. When closing the
stove flap, the closed are 40 of the casing 1 lying over the upper
edge 39 of the slit 24 engages. The actuating projection 31 abuts
this closed area 40 above the edge 39, and is reliably brought by
it into the latched position shown on FIG. 7 and kept there.
[0073] FIGS. 10 to 13 show a variation of the hinge depicted on
FIGS. 7 to 9, in which the corresponding parts are provided with
the same reference numbers. In the form of execution according to
FIGS. 10 to 13, the locking part 25' has a face 41 that forms a
stop surface. The pivot axis 26' of the locking part 25' is not
shiftable, but rather fixed. The cam plate 9 and additional cam
plate 4 or 4' are present in the form of execution according to
FIGS. 10 to 13, but not shown in order to simplify the drawing,
with the same holding true for brackets 33 and 35.
[0074] In the latched position according to FIG. 10, the face 41 of
the locking part 25 abuts the stop edge 38 of the counter-bearing
32. This is shown on FIG. 13 on a magnified scale. The distance
between the face 41 and the midpoint M of the pivot axis 26' rises
as the locking part 25 increasingly pivots clockwise, i.e., toward
the latched position. This is achieved by having the midpoint of
the bending radius r of the face 41 lie above, i.e., on the side of
the midpoint M of the pivot axis 26' of the locking part 25' facing
away from the axis 10. The midpoint m of the bending radius r is
upwardly shifted by measure a relative to the midpoint M. As a
result, the circular arc 42 formed by the radius r around the
midpoint m, on which the face 41 lies, runs over the circular arc
44 in the area over the intersecting point 43 between this circular
arc 42 and the circular arc 44 formed by the radius R around the
midpoint M. The radius R corresponds to the distance between the
corner 38 forming a stop edge and the midpoint M of the pivot axis
26' of the locking part 25'.
[0075] The locking part 25' drops down under its own dead weight
while turning around the pivot axis 26', until its curved face 41
stops against the upper outside horizontal edge of the
counter-bearing window 45, i.e., against corner 38, thereby
latching the connection between the plug-in part 2 and
counter-bearing 32. Upwardly shifting the radius midpoint m of the
face 41 from the rotational point M of the pivot axis 26' of the
locking part 25' by measure a determines the permissible tolerance
X in a horizontal direction and Y in a vertical direction. In this
case, care must be taken not to exceed a value depending on the
friction of the paired materials to uphold the principle of
self-locking.
[0076] FIG. 12 shows the locked position, in which the face 41
abuts the edge 39. FIG. 11 shows the intermediate position.
[0077] FIGS. 14 to 16 show a dummy hinge 46 that can be used along
with a hinge according to the invention, e.g., based on one of the
forms of execution shown on FIGS. 1 to 13, for a stove flap. The
hinge according to the invention is dimensioned in such a way that
it can absorb the forces necessary for providing a counterweight.
The invention makes this possible. The second hinge of the stove
flap can then be formed by the dummy hinge shown on FIGS. 14 to 16,
in which a counterweight is not provided. In particular, the dummy
hinge according to FIGS. 14 to 16 lacks a spring-loaded spring
guide provided with a roll guided through a cap plate of the
plug-in part.
[0078] This gives the dummy hinge a considerably simpler design.
Parts corresponding with those in the forms of execution on FIGS. 1
to 13 are provided with the same reference numbers. The dummy hinge
46 encompasses a casing 1, in which a plug-in part 2 is pivoted
around an axis 10, and a leg spring 47, which generates a small
closing torque to maintain the function of the lock formed by a
locking part 25' and the other components of the form of execution
shown on FIGS. 10 to 13. The leg spring 47 is mounted on the casing
1 and plug-in part 2. It is mounted with one end in the-casing 2,
winds round the bolt of the axis 10 several times, and then
proceeds with its other end to a stop bolt 48 provided on the
plug-in part 2, which it encompasses with its other end.
[0079] The dummy hinge 46 can be used in combination with a spring
hinge according to the invention, e.g., according to one of the
forms of execution on FIGS. 1 to 13, to save on costs. It functions
as a rotational axis, and generates no torque during opening to
counterbalance the door weight. The dummy hinge 46 requires neither
a compression spring nor a mechanism for conveying the forces. This
makes it less expensive to manufacture.
[0080] The invention and its advantageous further developments
enable the provision of a hinge according to the principle of
dual-acting, simple or overlapped control cam plates. The
progression of the cam plate 9 brings about a stronger or weaker
pre-stress on the spring 6, so that the hinge torque can be
controlled over the progression of the opening angle. The cam plate
9 can further be dual-acting, in such a way that increasing the cam
plate progression can generate a rising resistance or additional
torque, thereby making it possible in particular to increase the
closure moment during the closing process or create latching
points. The additional cam plate 4 offers another way to influence
the torque progression over the opening area of the stove flap by
changing the lever arm force h of the attacking force relative to
fulcrum 10. In particular, overlapping the two cam plate
controllers 9 and 4 makes it possible to expand the range of torque
influence, so that the size of the hinge can be considerably
reduced. The interplay between the two cam plates 9 and 4 allows
one to achieve nearly any desired hinge characteristics. In
particular, the additional cam plate 4 permits a decrease in the
effective lever arm force h shortly before the end stop. The
arrangement can be such that the torque growing over the opening
movement again tapers off. The stove flap can be made to open by
itself starting at a desired opening angle.
* * * * *