Information
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Patent Grant
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6684928
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Patent Number
6,684,928
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Date Filed
Monday, April 28, 200321 years ago
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Date Issued
Tuesday, February 3, 200421 years ago
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Inventors
-
Original Assignees
-
Examiners
Agents
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CPC
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US Classifications
Field of Search
US
- 160 310
- 160 265
- 160 238
- 160 322
- 160 2671
- 160 2681
- 160 66
- 160 68
- 242 388
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International Classifications
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Abstract
In an awning, in particular a sun room awning, comprising a fabric-roll shaft for retracting and extending an awning fabric; wherein the inward end of the awning fabric is joined to the fabric-roll shaft and the outward end of the awning fabric to a drop-out bar, and the drop-out bar is run in lateral guide rails; wherein elastic pull straps act on the drop-out bar on the side opposite the awning fabric, the pull straps being deviated by a deflection pulley in the vicinity of the end of the guide rail, and reversed towards the fabric-roll shaft and wound on the fabric-roll shaft upon extension and unwinding of the awning fabric and exercising tensile stress on the drop-out bar and thus on the awning fabric; wherein unwinding the awning fabric and winding up the pull straps take place by an electric motor drive of the fabric-roll shaft, and switchgear is provided for switching off the drive of the fabric-roll shaft upon complete extension; it is provided that the switchgear acts on the drive of the fabric-roll shaft for the drive to be switched off only after maximum extension being exceeded and the awning fabric being wound up by a defined angular range in the original direction of extension.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an awning, in particular a sun room awning, comprising a fabric-roll shaft for retracting and extending an awning fabric; wherein the inward end of the awning fabric is joined to the fabric-roll shaft and the outward end of the awning fabric to a drop-out bar, and the drop-out bar is run in lateral guide rails; wherein elastic pull straps act on the drop-out bar on the side opposite the awning fabric, the pull straps being deviated by a deflection pulley in the vicinity of the end of the guide rail, and reversed towards the fabric-roll shaft and wound on the fabric-roll shaft upon extension and unwinding of the awning fabric and exercising tensile stress on the drop-out bar and thus on the awning fabric; wherein unwinding the awning fabric and winding up the pull straps take place by an electric motor drive of the fabric-roll shaft, and switchgear is provided for switching off the drive of the fabric-roll shaft upon complete extension.
2. Background Art
An awning of the generic type is known from U.S. 2003/0019588 A1. The sun room awning there described comprises elastic pull straps for the awning fabric to be tautened even when partially extended. Complete extension of the awning fabric is conventionally detected by a touch sensitive switch or an optical switch, in dependence on which the electric drive is stopped.
SUMMARY OF THE INVENTION
It is an object of the invention, in an awning of the type under regard, to ensure reliable tautening of the awning fabric and optically attractive appearance, in particular upon complete extension, accompanied with the fundamental advantages offered by elastic pull straps.
According to the invention, this object is attained by the switchgear acting on the drive of the fabric-roll shaft in such a way that the drive is switched off only after maximum extension being exceeded and the awning fabric being wound up by a defined angular range in the original direction of extension.
Switchgear according to the invention can vary in design. For instance, it can be put into practice in the form of a torque limiter that is available in lots of electric motors; in the form of a force-displacement transmitter that is integrated in the electric motor; in the form of electronic measuring means by which to detect the relative phase position of current and voltage as a function of strain on the electric motor; or in the form of external switchgear.
According to the invention, the conventional limit stop is abandoned and the power of the electric drive is used for tautening the awning fabric; or switching off in dependence on displacement is effected only when maximum extension has been exceeded.
In particular, provision can be made for the motion of the awning fabric to be stopped in dependence on torque upon extension as well as retraction.
Primarily, the idea will be to use an electric motor. However it is conceivable, in particular in the case of window awnings, to provide manual actuation, with the torque sensor, as it were, being replaced by an operator sensing. For maintenance of the set degree of fabric tautening, a self-locking mechanism must be provided between the manual actuating system, in particular a crank, and the fabric-roll shaft.
The awning fabric is fixed by piping in a piping groove of the fabric-roll shaft in a manner known per se.
In keeping with another embodiment, a deflection pulley for each pull strap is provided in front of the fabric-roll shaft in such a way that the pull straps run along the guide rails.
An advantageous possibility of putting into practice the switch-off behaviour according to the invention resides in that the switchgear is released in dependence on the tensile stress on the pull straps and on the awning fabric, in particular by the switchgear comprising a torque transmitter that is disposed on the fabric-roll shaft.
The invention also relates to a method of extension control of the awning fabric of a sun room awning, which is characterized in that the awning fabric, upon maximum extension, is wound up in the original direction of extension until given and desired tautening is reached.
Details of the invention will become apparent from the ensuing description of an exemplary embodiment, taken in conjunction with the drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1
is a plan view of a sun room awning according to the invention;
FIG. 2
is a section on the line II—II of
FIG. 4
; and
FIGS. 3
to
5
are sections on the line III—III of FIG.
1
.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A sun room awning
1
seen in
FIG. 1
comprises a fabric-roll shaft
2
, mounted for rotation on the wall of a house (not shown), for retraction and extension of an awning fabric
3
, the inward end of which is fixed by a piping
4
in a piping groove
5
of the fabric-roll shaft
2
, and the outward end of which is fixed by a piping
6
in the piping groove
7
of a drop-out bar
9
. The drop-out bar
9
is run in lateral guide rails
10
by way of a respective slider
11
which slides on slide rails
12
of the guide rails
10
.
The side of the drop-out bar
9
that faces away from the piping groove
7
is provided with another piping groove
14
, with an elastic pull strap
15
being applied to both outer ends thereof; the pull strap
15
is deviated by a deflection pulley
16
on the drop-out side, reversed and again deviated by a deflection pulley
17
in the vicinity of the fabric-roll shaft
2
and wound on or off winding pulleys
18
on both sides of the fabric roll.
The fabric-roll shaft
2
is drivable, controlled by an electric motor
19
, with a torque transmitter
20
, which is mounted on the fabric-roll shaft
2
, measuring the torque that acts on the fabric-roll shaft
2
in accordance with the tensile stress that acts on the awning fabric
3
.
Proceeding from the retracted condition, seen in
FIG. 3
, of the awning fabric
3
and the drop-out bar
9
, the fabric-roll shaft
2
is actuated by the electric motor
9
for extension of the awning fabric
3
in the direction of extension (arrow
21
), with the condition of maximum extension, seen in
FIG. 4
, of the drop-out bar
9
then being reached. In this condition, the awning fabric
3
is extended radially away from the fabric-roll shaft
2
i.e., no fabric rests on the fabric-roll shaft
2
and the awning fabric
3
extends from the piping groove
5
directly radially outwards. As a result, when the fabric-roll shaft
2
continues to rotate by for example 90° in the original direction of extension (arrow
21
), the awning fabric
3
is again wound on the fabric-roll shaft
2
by a corresponding length, and the drop-out bar
9
is retracted by some length, as seen in
FIG. 5
, as a result of which the elastic pull straps
15
are also wound up and tightened so that defined tensile stress acts on the awning fabric
3
in the extended condition, keeping it stretched.
The desired defined tensile stress is detected by a torque transmitter
20
which is disposed on the fabric-roll shaft
2
and the turning-moment of which is compared to a given desired value and which will then switch off the electric motor
19
.
Claims
- 1. An awning, in particular a sun room awning, comprisinga fabric-roll shaft (2) for retracting and extending an awning fabric (3); wherein an inward end of the awning fabric (3) is joined to the fabric-roll shaft (2) and an outward end of the awning fabric (3) to a drop-out bar (9), and the drop-out bar (9) is run in lateral guide rails (10); wherein elastic pull straps (15) act on the drop-out bar (9) on the side opposite the awning fabric (3), the pull straps (15) being deviated by a deflection pulley (16, 17) in the vicinity of the end of the guide rail (10) and reversed towards the fabric-roll shaft (2) and wound on the fabric-roll shaft (2) upon extension and unwinding of the awning fabric (3) and exercising tensile stress on the drop-out bar (9) and thus on the awning fabric (3); wherein unwinding the awning fabric (3) and winding up the pull straps (15) take place by an electric motor drive (19) of the fabric-roll shaft (2), and switchgear is provided, switching off the drive (19) of the fabric-roll shaft (2) upon complete extension; and wherein the switchgear (20) acts on the drive (19) of the fabric-roll shaft (2) for the drive (19) to be switched off only after maximum extension being exceeded and the awning fabric (3) being again wound up by a defined angular range in the original direction of extension (21).
- 2. An awning according to claim 1, wherein the awning fabric (3), upon extension as well as retraction, is stopped in dependence on an achieved turning moment.
- 3. An awning according to claim 2, wherein the inward end of the awning fabric (3) is fixed by a piping (4) in a piping groove (5) of the fabric-roll shaft (2).
- 4. An awning according to claim 1, wherein a deflection pulley (16, 17) for the pull straps (15) is provided in front of the fabric-roll shaft (2) so that the pull straps (15) run along the guide rails (10).
- 5. An awning according to claim 1, wherein the switchgear is released in dependence on the tensile stress on the pull straps (15) and on the awning fabric (3).
- 6. An awning according to claim 5, wherein the switchgear includes a torque transmitter (20) that is mounted on the fabric-roll shaft (2).
- 7. A method of extension control of an awning fabric of an awning, in particular a sun room awning, comprisinga fabric-roll shaft (2) for retracting and extending an awning fabric (3); wherein an inward end of the awning fabric (3) is joined to the fabric-roll shaft (2) and an outward end of the awning fabric (3) to a drop-out bar (9), and the drop-out bar (9) is run in lateral guide rails (10); wherein elastic pull straps (15) act on the drop-out bar (9) on the side opposite the awning fabric (3), the pull straps (15) being deviated by a deflection pulley (16, 17) in the vicinity of the end of the guide rail (10) and reversed towards the fabric-roll shaft (2) and wound on the fabric-roll shaft (2) upon extension and unwinding of the awning fabric (3) and exercising tensile stress on the drop-out bar (9) and thus on the awning fabric (3); wherein unwinding the awning fabric (3) and winding up the pull straps (15) take place by an electric motor drive (19) of the fabric-roll shaft (2), and switchgear is provided, switching off the drive (19) of the fabric-roll shaft (2) upon complete extension; wherein the switchgear (20) acts on the drive (19) of the fabric-roll shaft (2) for the drive (19) to be switched off only after maximum extension being exceeded and the awning fabric (3) being again wound up by a defined angular range in the original direction of extension (21); and wherein the awning fabric (3), upon maximum extension, is wound up in the original direction of extension until given desired tautening is reached.
Priority Claims (1)
Number |
Date |
Country |
Kind |
102 18 572 |
Apr 2002 |
DE |
|
US Referenced Citations (6)
Foreign Referenced Citations (5)
Number |
Date |
Country |
44 40 449 |
Jun 1995 |
DE |
195 05 273 |
Aug 1997 |
DE |
197 10 390 |
Sep 1998 |
DE |
198 41 958 |
Mar 2000 |
DE |
100 33 419 |
Jan 2002 |
DE |