DE112007000007T5 - Self-lifting window cover - Google Patents

Abstract

A control mechanism for a self-lifting window cover, the window cover comprising a head rail, a suspended panel member, a bottom rail, and at least one lifting line operatively connected to the bottom rail at a first end, the control mechanism comprising:
a drive axle;
a drive unit operatively connected to the drive axle
apply a substantially constant rotational force to the drive axle;
at least one line take-up assembly mounted on the drive axle and having a take-up section having a first end with a first diameter and a decreasing diameter toward a second end, wherein a second diameter is smaller than the first diameter, the line take-up assembly being rotationally powered can be operated, which is applied by the drive unit to wind the lifting line to raise a suspended weight, which consists of at least the bottom rail and a part of the shutter member which is stacked on the bottom rail; and
a coupling element that works effectively with ...

Description

Field of the invention

The Invention relates to a window cover that can be raised without a force on either a control mechanism or the Window cover itself applied or exercised must when the window cover is opened. Especially The present invention relates to a window cover with a Control mechanism configured one upwards to exert directed force on the visor element and the bottom rail, which is sufficiently strong to the aperture element and the bottom rail raise without any additional force from the user during the lifting is applied.

Background of the invention

window shades and window covers are found in numerous applications and used to regulate the amount of light that enters a room entrance, as well as to an equipment an aesthetic To give paint. Such window screens and window covers have numerous shapes, including roller shutters, bezels Romanesque style, venetian blinds and cellular or consisting of cells aperture. Conventional cellular Irises or pleated blinds use linen locks or Cord locks or a transmission mechanism to the Lift window cover to a desired position, lower and position. For window coverings, a leash lock use, run lines or cords through the folded Textile material along the inside of a head rail and get through a locking mechanism. Other cellular Apertures include a transmission mechanism and an uninterrupted one Loop line drawn by a user around the window shutter raise and lower. Apertures of the Romanesque type and blinds (venetian blinds) also often have levers which are attached to a lower rail or bottom rail.

These Embodiments have some disadvantages. Linen represent insofar a potential source of danger when a child is in the exposed control line can get entangled or even strangled by this. Furthermore, linen leads to these from the aesthetic Distracting the design of a window cover, as this along the Extend front of the window cover and, if the window shutter is opened, either rolled up on a hook need to or simply have to remain on the ground. Window covers that use line locks are the leashes as well due to a significant wear a friction against surfaces as a result suspended from raising and lowering the window cover.

Other Window coverings include conventional roller shutters (roller shades) that do not need a leash. These roll covers include a retraction mechanism with a wound or wound Torsion spring in combination with a coupling or locking mechanism, the is attached with a roll on which the aperture is rolled up and is collected. In operation, a rolling shutter is created by a user pulled down to a desired location, where these by means of Coupling or locking mechanism locked in position becomes. To unlock the bezel and release it so that this can be raised, the user usually pulls on a bottom rail of the panel to extend the panel sufficiently, to release the internal coupling or locking mechanism. When the clutch or locking mechanism is released has been and the user releases the aperture, then the aperture using the torsion spring driven feed mechanism moved in. However, known roller shutters can only be operated with a flat panel material, which is Rolling up a limited place neatly.

Of the Mechanism used in such roller shutters is not compatible with other window covers, such as Cell apertures, blinds and blinds of the Romanesque type. If roller shutters then the part of the aperture that is raised becomes smaller, allowing a torsion spring element with constant force to do so is suitable, the necessary Aufrollkraft or upward Apply force over the entire opening area. In contrast, a comparable lifting mechanism is typical unsuitable for cell covers, blinds and aperture of the Romanesque type. In window covers of this type, the material of the panel element is usually collected by a soil element, such as a bottom rail, is raised, and an increasing weight is placed on the floor element accumulated while the window cover is raised. The reason for this is that the aperture material or the aperture element increasingly accumulates on the bottom rail or stacks while the bottom rail is raised, which increases the load on the lifting mechanism.

To cope with this increasing weight, very strong torsion springs have been used to cope with the maximum weight of the visor. A disadvantage of this approach exists however, in that the rate at which the window cover is retracted may be too fast and uncontrolled. An attempt to solve this problem is in the U.S. Patent No. 6,666,252 (Welfonder) described. This patent describes the use of a fluid brake to control the rate at which the levers are retracted during the lifting process. Another approach that has been used is in the U.S. Patent No. 6,056,036 (Todd) using a mechanical friction element to continuously slow down the feed rate. A problem with these approaches is that the spring used exerts a force that makes it difficult for a user to overcome when attempting to lower the bezel. Excessive pulling force of the user often results in damage to the window cover.

alternative Variable force springs have been used. Such springs variable Force are significantly more complicated in terms of use and the production.

Therefore There is a need for a window cover lift mechanism for window coverings, such as blinds, cell covers and Apertures of the Romanesque type, which is self-lifting or lifting and solves the above problems.

Summary of the invention

The The present invention relates to a self-lifting or lifting Window cover and a control mechanism for the Window covering. In particular, the window cover is a self lifting window cover, which slides a head, an aperture element, such as a cell wall surface, aperture blades or material of an aperture of a Romanesque type, a bottom rail, at least one lifting cord or lifting cord which is effective on a first end connected to the bottom rail, and a control mechanism includes. The head rail can define an elongated channel in which the control mechanism is arranged. In some embodiments the control mechanism comprises a drive axle and a drive unit, which is effectively connected to the drive axle. The drive unit, at which can be a spring with a constant force, is designed to be a substantially constant rotational force to exercise on the drive axle.

At least a line winding arrangement is also more coaxial Provided relationship with the drive axle. Typically, this corresponds to Number of line take-up arrangements of the number of levers. In some cases, however, a line winding arrangement be designed to be operated with multiple lines. The linen winding arrangement comprises at least one take-up drum or take-up screw, which is operatively connected to a second end of the lifting line and has a tapered portion. The linen winding arrangement also includes a rotatable positioning element, around the line winding assembly upon rotation of the positioning element to move along the drive axle along the longitudinal side. In a preferred embodiment is the positioning element a threaded tubular Element that is connected to the take-up screw. The linen winding arrangement is configured, the rotational force acting on the drive axle to translate into a lifting force on the lifting line acts, with the lifting power greater than one after down directed total force is over the whole range of opening and closing by the visor element and the bottom rail is exercised. In a preferred embodiment is the line winding arrangement in the direction of rotation with the drive axle fastened by means of a hub element, which is designed, the Leinenaufwickelanordnung and the drive axle to engage. The hub member may be in sliding relation with the tapered portion of the linen reel assembly are located.

One Coupling element or locking element is also operatively connected to the axle and designed to be releasable Lock the drive axle in a desired position. In a preferred embodiment, the coupling element comprises a reciprocating element relative to the drive axle is coaxially arranged and between a released position and a locked position can be moved, and a spring element, which is connected to the reciprocating element and is operable, either the admission of the drive axle to increase or increase by the reciprocating element reduce. The reciprocating element is designed, to cause the spring element on the drive axle tightened in the locked position to a rotation of the drive axle to block against the rotational force applied by the drive unit is, and to cause the spring element, the drive axle releases in the released position due to rotation of the drive axle to allow the rotational force generated by the drive unit is applied.

Brief description of the drawings

1 shows a perspective view, partially cut away, a preferred Ausfüh Form of a window cover according to the present invention.

2 shows an exploded perspective view of the drive unit with a single coil spring of 1 ,

3 shows a side cross-sectional view of the drive unit with a single coil spring of 1 ,

4 shows a side cross-sectional view of an alternative drive unit with a single coil spring.

5 shows a side cross-sectional view of a drive unit with two springs.

6 shows a side cross-sectional view of an alternative drive unit with two springs.

7 shows an exploded perspective view of the 1 illustrated linen winding arrangement.

8A shows a side elevation of the window cover of 1 in a closed position from the front, wherein the head rail is shown in cross section.

8B shows an elevation of the window cover of 1 in a partially open position from the front, wherein the head rail is shown in cross section.

9A shows a perspective view of a preferred coupling element when the window cover is in a fully raised position.

9B shows a cross-sectional view of the coupling element of 9A ,

10A shows a perspective view of the coupling element of 9A when the user pulls the window cover down.

10B shows a cross-sectional view of the coupling element of 10A ,

11A shows a perspective view of the coupling element of 9A when the user releases the window cover.

11B shows a cross-sectional view of the coupling element of 11A ,

12A shows a perspective view of the coupling element of 9A when the user pulls the window cover down to release the coupling element.

12B shows a cross-sectional view of the coupling element of 12A ,

13A shows a perspective view of the coupling element of 9A when the window cover lifts by itself.

13B shows a cross-sectional view of the coupling element of 13A ,

14 shows a perspective view of an alternative embodiment of a window cover according to the present invention with a braking element.

15A shows a side cross-sectional view of the braking element of 14 that is detached from a linen take-up assembly.

15B shows a side cross-sectional view of the braking element of 14 engaging a line winding assembly.

15C shows a side cross-sectional view of the braking element of 14 when the window cover is fully raised.

Detailed description preferred embodiments

The The invention described herein may be in many different Forms are formed. Preferred embodiments The present invention are illustrated in the drawings and will be described in detail below. The present description however, is merely an exemplification of the principles and features of the invention and limits the invention not to the illustrated embodiments.

1 shows an embodiment of a self-lifting or lifting window cover 10 according to the present invention. A head rail 12 that defines a channel is provided. A pair of drive units, such as the spring units 14 and 16 , is coaxial about a drive axle 18 appropriate. Also, on the drive axle 18 Leinenaufwickelanordnungen 20 and 22 appropriate. Each of the linen winding arrangements 20 and 22 comprises a frusto-conical winding drum or Aufwickelschnecke 24 and 26 , as well as a threaded tubular member 32 respectively. 34 , The levers 28 and 30 which are shown as these on the winding screws 24 and 26 are wound at one end to the winding screws 24 and 26 attached. In this embodiment is outside he also has a clutch 36 provided and coaxial on the drive axle 18 appropriate. Each of these components will be described in more detail below. The window cover 10 further comprises a diaphragm member, such as cellular diaphragm material 38 , as well as a floor element, such as the floor rail 40 , As used herein, the term "rope" may include a line, a strip, a ribbon, a thread, a string, or any comparable flexible elongated elements capable of supporting the suspended visor element and being wound or wound can be unwound to extend or retract the aperture element. A relatively short piece of linen 42 may also be provided so that the user can pull down the window cover and, as will be described in more detail below, release the coupling so that the window cover retracts by itself.

2 shows a preferred embodiment of the spring unit 14 , The spring unit 14 includes a spring housing 42 , a spring axis 44 , a coil spring 46 with constant force as well as a cover 48 , The coil spring 46 and the spring axis 44 are inside the case 42 fastened by the cover 48 closed is. A first end 50 the coil spring 46 is to the spring axis 44 attached, which is coaxial with the drive axle 18 connected is ( 1 ). In this preferred embodiment, the coil spring is designed, a sufficient rotational force on the drive axle 18 and the winding screws 24 and 26 exercise to lift the panel element and the bottom rail. Other alternative embodiments of spring elements are also possible, as these in the 3 to 6 are shown.

For example, a suitable spring unit 114 , in the 3 is shown, a coil spring element 146 comprising a first end having a first spring axis 142 attached to the in 1 illustrated drive axle 18 is connected, as well as a second end, with a second spring axis 144 attached to the first spring axis 142 is offset. The coil spring 146 may initially be in a relaxed position about the second spring axis 144 be wound up. When the panel is pulled down, then the coil spring can 146 from the second spring axis 144 expand and progress around the first spring axis 142 wrap. This embodiment of the spring unit 114 may be suitable if the coil spring used 146 has a greater length to allow a longer extension of the diaphragm element.

4 shows another suitable spring unit 214 that the execution of in 3 illustrated embodiment, but wherein the second end of the coil spring is not connected to any second spring axis. Instead, the coil spring wraps 246 at the second end itself, while the first end 252 the coil spring 246 with a single spring axis 218 connected with the in 1 illustrated drive axle 18 connected is.

Yet other suitable embodiments of the spring units are in the 5 and 6 shown. In 5 includes the spring unit 314 an arrangement of two coil springs 346 and 348 , which can be used to provide a greater lifting force in terms of the diaphragm element. The first end of the first coil spring 346 is with a first coil axis 344 connected and the first end of the second coil spring 348 is with a second spring axis 345 connected. The second end of the first coil spring 346 and the second end of the second coil spring 348 are each with a third spring axis 318 connected between the first and the second spring axis 344 and 345 is arranged and with the drive axle 18 connected is. When the panel is pulled down, then the coil springs can 346 and 348 each of the first and second spring axis 344 and 345 expand to progressively around the third spring axis 318 to wind up, an increased lifting force on the drive axle 18 exercise. In the 6 illustrated embodiment is the in 5 embodiment shown very similar, but with the two coil springs 446 and 448 that are on the axis 418 are wound, which is connected to the drive axle, not connected to second spring axes. Although each of the illustrated embodiments uses a spring as the drive mechanism for the drive unit, it should be understood that any suitable mechanism for applying rotational force to the drive axle may be used.

How this in turn 1 can be seen causes the rotational force on the drive axle 18 is exercised that the linen winding arrangements 20 and 22 rotate or rotate and the lines 28 and 30 be wound, which in turn the aperture element 38 in the vertical direction in the direction of the head rail 12 raising. Further details of a preferred embodiment of a linen take-up assembly will be made with reference to FIG 7 described.

The linen winding arrangement 20 is coaxial with the drive axle 18 mounted, which is guided by a fixed housing, which consists of a frame 64 and a top cover 65 consists. The linen winding arrangement 20 comprises a take-up drum or take-up screw 24 and a rotational positioning member such as a threaded tubular member 32 Standing at one end of the winding screw 24 connected is. The linen winding arrangement 20 is preferably by means of a hub member on the drive axle 18 attached, such as adapters 60 which is ausgestaltet, a rotational movement between the drive axle 18 and the linen winding assembly 20 while allowing relative translational movement therebetween. In some embodiments, the adapter 60 coaxial within a central hole of the take-up screw 24 be mounted and a through hole for attaching the drive axle 18 include. To transfer a rotational movement, while an undisturbed relative translation between the take-up screw 24 and the adapter 60 allows, a peripheral surface of the adapter 60 be provided with radial portions which are in contact with ribs, which from the surface of the central hole of the take-up screw 24 protrude radially inwards. Further, the threaded tubular member takes 32 toothed rollers 66 engaged, rotatable on the frame 64 and the clip 68 attached, which are fixed in the head rail 12 is attached. Rotational movements can thus between the drive axle 18 and the linen winding assembly 20 while undisturbed relative translations with reduced friction between them are possible. Moreover, the engagement allows the adapter 60 and the threaded tubular member 32 an improved support of the load of the depending components, such as the aperture element 38 and the bottom rail 40 ,

The winding screw 24 is tapered and preferably has a truncated cone shape and may include gaps or grooves to facilitate gripping the line 28 to improve on the surface of the winding screw 24 is wound up. One end of the lifting line (not shown) is toward the end 62 with larger diameter of the take-up screw 24 attached. When the line winding arrangement 20 turns and moves in one direction to the lifting line 28 winding up, then the lifting line becomes progressively narrower sections of the winding screw 24 wound.

In the 8A and 8B is the lifting of the window cover shown. When the aperture element 38 is fully extended, as in 8A is shown, then the lever is a lever 28 completely from a wider section of the wind-up screw 24 extended. When the bottom rail 40 due to the elastic force of the spring units 14 and 16 raises, as in 8B is shown, then the In-Einginffnahme over the thread between the threaded tubular member causes 32 and the roles 66 in that the rotating line winding arrangement 20 laterally within the head rail 12 moved, so that the lifting line along the winding screw 24 winding towards its narrower end.

Because the lifting floor rail 40 causes the aperture element 38 collapses and accumulates on it, the total weight that is lifted by means of the elastic force decreases through the spring units 14 and 16 is applied, too. The load on the spring units will now be described with reference to one of the spring units. The load on a spring unit 14 is determined by an adequate scaling factor based on a pulse M on the drive axis 18 derived by the product of the suspended weight W, including the weight of the bottom rail plus the panel element stacked thereon 38 , as well as a winding radius R of the take-up screw 24 can be approached. If the bottom rail 40 is raised, then W becomes larger and R decreases, since the lever line 28 on progressively narrower sections of the tapered wind-up screw 24 Wraps with less friction due to the adapter 60 and the threaded tubular member 32 and the adapter 60 slide. Thus, although the depending weight W increases, the load M on a spring unit 14 be kept at a level that varies little and that by a spring 46 can be overcome with constant force ( 2 ) to the bottom rail 40 and the aperture element 38 completely raise. To lower the window cover, a user applies an approximately constant pulling force regardless of the position with respect to the height of the window cover. With the linen winding arrangements 20 and 22 can the spring units 14 and 16 thus be used with a constant force suitable to lift a hanging weight W, which increases when it is raised.

In some embodiments, such as the one shown, For example, the aperture element itself can have an effect on the downward acting Total strength or hanging weight. If For example, the diaphragm element a cellular window cover is, then can an inherent upward spring preload to serve the material, the downward total force to diminish. The total contribution of this preload varies depending on the degree to which the cellular window cover is extended.

If, as explained, the window cover opens, then the hanging Ge decreases Total weight to and total lifting power decreases. Therefore, the rate at which the window cover is raised decreases as it approaches a fully opened condition. Thus, the disadvantage that usually occurs in a roller blind, in which the aperture is drawn too fast and too violent, avoided.

How this in turn 6 can be seen, is the coupling element 36 provided to the aperture element 38 and the bottom rail 40 in a desired position to lock. The coupling element 36 is coaxial with the drive axle 18 mounted and configured, the drive axle 18 to unlock when the user has the bottom rail 40 pulls down to the aperture element 38 take off, and around the drive axle 18 to lock when the user the floor rail 40 releases at the desired height. If the user pulls down a little the bottom rail again, then the coupling releases and allows the bottom rail 40 through the spring units 14 and 16 is raised. How is this the 9A and 9B can be seen, comprises the coupling element 36 a housing 70 , the fixed tabs 72 and 74 having. A cuff or sleeve 76 connected to the drive axle 18 rotates, is provided, extending along the drive axis 18 axially reciprocated. A floating element 78 is coaxial over the cuff 76 attached and can be moved in both the rotational direction and in the axial direction. A feather 80 with a first end 82 and a second end 84 is between the cuff 76 and the floating element 78 provided.

The 9A and 9B show the clutch when the window cover 10 in a fully raised position. The feather 80 is in a relaxed state, being the second end 84 in an abutting relationship with the lead 74 located. How is this the 10A and 10B When the user pulls on the bottom rail (not shown), a clockwise rotation (as shown) of the axle occurs 18 and the cuff 76 on and causes the second end 84 the feather 80 away from the lead 74 solves. The feather 80 pulls on the cuff 76 firmly, allowing a rotation of the cuff 76 on the floating element 78 about the contact between the first end 82 the feather 80 and the floating element 78 is transferred, causing the reciprocating element 78 in an abutting relationship with the lead 72 is brought. When the floating element 78 in abutting relationship with the projection 72 then the spring relaxes 80 turn and the drive axle 18 may continue to rotate while the user continues to pull on the bottom rail. How is this the 11A and 11B can be seen, the spring 80 When the user releases the bottom rail at a desired height, on the cuff 76 and the drive axle 18 tightened by the spring units 14 and 16 ( 1 ) is forced to do so, causing the floating element 78 rotates in a counterclockwise direction until it reaches a locking position in which the projection 72 to a stopper 79 on the floating element 78 abuts. In this locking position is the spring 80 tightened to a rotation of the drive axle 18 to stop the lifting force passing through the spring units 14 and 16 is exercised. How is this the 12A and 12B can be seen, the spring 80 when the user pulls down the bottom rail a little, tightened and resulting rotation of the drive axle 18 and the cuff 76 Clockwise causes the oscillating element 78 from the locking position in a release position triggers. When the user releases the bottom rail, as in the 13A and 13B is shown, then cause the spring units 14 and 16 that is the drive axle 18 rotated in a counterclockwise direction to the second end 84 the feather 80 in an intervention with the projection 74 to bring, causing the spring 80 is solved, what is the drive axle 18 allows to continue, rotate and fully open the window cover.

An alternative embodiment of the window covering according to the present invention is shown in FIG 14 shown. With regard to most aspects, this embodiment corresponds to that described above. The window cover 510 includes a head rail 512 with a pair of spring units 514 and 516 that with a drive axle 518 are mounted. Leinenaufwickelanordnungen 520 and 522 are also provided. The levers 528 and 530 are through the aperture element 538 guided and are with the bottom rail 540 connected. Moreover, at least one brake element 550 provided. The brake element 550 can be a linen winding arrangement 522 engage in lifting the bottom rail 540 Brake when approaching the head rail.

The preferred embodiment of the braking element 520 is in the 15A to 15C shown. In the position of 15A is the line winding arrangement 522 from the brake element 550 detached. When the linen take-up assembly 522 the leash 526 winds up, then moves the line winding arrangement 522 also in the direction of the brake element 550 , When the linen up winding arrangement 522 a plate 552 of the braking element 550 engages like this in 15B is shown, then causes the rotation of the line winding arrangement 522 that the plate is 552 rotates. The plate 552 is with an axle cuff 554 which is in contact with a braking element, such as a viscous oil fluid, within a housing 556 is included. The cuff 554 is configured to provide a frictional contact with the brake element to decelerate the rotation of the line winding assembly. For example, projections or ribs on the axle sleeve 554 be provided. The rate at which the bottom rail is moved by means of the spring units 514 and 516 is raised, is slowed down or slowed down when the bottom rail reaches the head rail, so that the bottom rail stops gently at a fully open position.

Of the One skilled in the art will recognize that the above description is merely exemplary in nature. but not limiting. Still more variants within the scope and spirit of the present invention Invention will be apparent to those skilled in the art.

SUMMARY

The The present invention relates to a self-lifting window cover and a window cover control mechanism. In particular, includes the window cover a drive unit, such as a A spring of constant force, which is essentially one Constant rotational force on the drive axle exercise. A line winding arrangement is coaxial on the drive axle attached and includes at least one take-up screw, the effective connected to a second end of the lifting line and a tapered Section, as well as a rotatable positioning element, around the line take-up assembly laterally along the drive axis to move during a rotation of the positioning element. The linen winding arrangement is designed, the rotational force acting on the drive axle acts to transfer to a lifting force, which is on the lifting line acts, with the lifting power greater than one after down directed force is through the aperture element and the Ground rail over the area of opening and closing is exercised. A coupling element or locking element is also effectively connected to the axle and configured, the drive axle in a desired position releasable too lock.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - US 6666252 [0006]
• - US 6056036 [0006]

Claims (26)

Control mechanism for a self-lifting window cover, wherein the window cover comprises a head rail, a suspended one Shutter element, a bottom rail, and at least one lifting line, which is effectively connected to the bottom rail at a first end is, wherein the control mechanism comprises: a drive axle; a Drive unit operatively connected to the drive axle around a substantially constant rotational force on the drive axle exercise; at least one line winding arrangement, which is mounted on the drive axle and a take-up section with a first end having a first diameter and having a first diameter decreasing diameter toward a second end, wherein a second diameter is smaller than the first diameter, wherein operated the line winding arrangement by means of rotational force which is applied by the drive unit to the Winding up levers to lift a suspended weight, at least the bottom rail and a part of the diaphragm element which is stacked on the bottom rail; and one Coupling element which is operatively connected to the drive axle and is configured to releasably lock the drive axle and the rotation of the drive axle against the rotational force To block, which is applied to the drive unit. Control mechanism according to claim 1, wherein the drive unit includes a spring with constant force. A control mechanism according to claim 1, wherein the line take-up assembly in the direction of rotation with the drive axle via a hub element attached, which is configured, the line winding arrangement and engage the drive axle. Control mechanism according to claim 3, wherein the hub member in sliding engagement with the winding section of the Leinenaufwickelanordnung is located. A control mechanism according to claim 1, wherein the line take-up assembly a threaded tubular Element comprising one or more teethed Rolls engages to provide axial translation of the line winding assembly along the drive axle when the line take-up assembly rotates. Control mechanism according to claim 1, wherein the coupling element includes: a floating element that is coaxial is arranged relative to the drive axle and between a released Position and a locked position can be moved; and one Spring element connected to the reciprocating element is and can be operated by the application of the drive axle either to increase the floating element or to degrade; being the floating element is configured to cause the spring element on the Drive axle is tightened in the locked position to a rotation of the drive axle relative to the rotational force to be blocked, which is applied by the drive unit, and to cause the spring element with respect to the drive axle relaxed in the released position to a rotation of the drive axle under the effect of the rotational force to be released by the Drive unit is applied. Control mechanism according to claim 6, wherein the coupling element further comprises an annular collar, which with the Drive axle is fixed and has a peripheral surface, around which the spring element is attached. Control mechanism according to claim 1, wherein the control mechanism Further, a braking element comprising the line winding arrangement can engage in a lifting movement of the bottom rail in Decelerate direction of the head rail. A self-lifting window cover, comprising: a head rail defining an elongate channel; a floor element; a shutter member suspended between the head rail and the floor member; and a control mechanism mounted within the channel of the head rail, the control mechanism comprising: a drive axle operable to rotate under the action of a substantially constant rotational force applied by a drive unit; at least one line winding assembly mounted on the drive axle and having a take-up section with a first end having a first diameter and a decreasing diameter toward a second end, a second diameter being smaller than the first diameter; at least one lifting line having a first end and a second end, the first end being fixed towards the first end of the take-up section and the second end being connected to the floor element; and a clutch member operatively connected to the drive axle and configured to releasably block rotation of the drive axle. A window cover according to claim 9, wherein the drive unit includes a spring with constant force. A window cover according to claim 9, wherein the linen take-up assembly is mounted by means of a hub member on the drive axle. A window cover according to claim 11, wherein the hub member in sliding engagement with the winding section of the Leinenaufwickelanordnung is located. A window cover according to claim 9, wherein the linen take-up assembly a threaded tubular Element comprising one or more teethed Rolls engages to provide axial translation of the line winding assembly along the drive axle when the line take-up assembly rotates. A window cover according to claim 9, wherein the coupling element includes: a floating and coaxial element is arranged relative to the drive axle and between a released Position and a locked position can be moved; and one Spring element connected to the reciprocating element is and can be operated by the application of the drive axle either to increase the floating element or to degrade; being the floating element is configured to cause the spring element on the Drive axle is tightened in the locked position to a rotation of the drive axle relative to the rotational force to be blocked, which is applied by the drive unit, and to cause the spring element with respect to the drive axle relaxed in the released position to a rotation of the drive axle under the effect of the rotational force to be released by the Drive unit is applied. A window cover according to claim 14, wherein the coupling element further comprises an annular collar, which with the Drive axle is fixed and has a peripheral surface, around which the spring element is attached. A window cover according to claim 9, wherein the control mechanism Further, a braking element comprising the line winding arrangement can engage in a lifting movement of the bottom rail in Decelerate direction of the head rail. A window cover according to claim 9, wherein the panel member comprises a collapsible cellular diaphragm. Self-lifting window cover comprising: a Head rail; a plurality of levers attached to the head rail are; a floor element, which by means of the levers on the head rail is attached; an aperture element that is between the Head rail and the floor element is attached; one Coupling element, which is effectively connected to a drive axle is and is equipped to releasably lock the drive axle; in which the head rail further comprises a control mechanism, wherein the Control mechanism includes a drive unit that designed is a substantially constant rotational force on the drive axle apply, as well as a Leinenaufwickelanordnung coaxially the drive axle is mounted, wherein the Leinenaufwickelanordnung designed is the rotational force acting on the drive unit in a to transfer linear lifting force on the levers acts, and to increase the lifting power, if that Floor element is raised; and where the linear lifting force is sufficient to fully raise the bottom rail and the visor element, if the window cover from a closed position into a open position is moved. Window cover near claim 18, wherein the linen take-up arrangement a winding screw with a tapered section and a positioning member that is configured, the line winding arrangement to force laterally along the drive axis as it rotates becomes. A window covering according to claim 18, wherein the line take-up assembly in the direction of rotation with the drive axle via a hub element attached, which is configured, the line winding arrangement and engage the drive axle. A window cover according to claim 20, wherein the hub member in sliding engagement with a rejuvenated one Section of the leash is located. A window cover according to claim 19, wherein the positioning element a threaded tubular Element is. A window cover according to claim 18, wherein the drive unit comprises a spring with constant force. A window cover according to claim 18, wherein the coupling element a spring element, which is configured, releasably, the position to attach the drive axle, if this in a tightened Position, and to allow the rotation of the drive axle, when this is in a relaxed state, wherein the coupling element further contains a reciprocating element, which is arranged in the circumferential direction about the drive axis and is configured, selectively the spring element in the tightened and related positions to keep. The window cover of claim 24, further comprising an annular cuff with the drive axle is attached and connected to the spring element. The window cover of claim 18, further comprising a brake element that engages the line reel assembly can and is in coaxial relation with this.