EP1264957B1 - Tilting mechanism for a lamellar blind - Google Patents

Abstract

Turning device comprises a winding drum (14) rotated by a winding shaft (12), an annular groove (16) on the periphery of the drum, a wedge groove (22) on the periphery of the drum for guiding a wedge-shaped annular segment, a first fixed stop in the wedge groove, a second fixed stop in the wedge groove, a first catch for slotting into the wedge groove, a second catch for slotting into the wedge groove, control plates (40, 50) rotating on the winding shaft, and a control device (80) arranged in an axial groove (17) running through the wedge groove of the drum. Preferred Features: The control device runs radially into peripheral recesses of the control plates.

Description

The invention relates to a turning device for a venetian blind with a winding drum penetrated by a winding and turning shaft, an annular groove on the circumference of the winding drum, in which a drawstring opens and closes can be developed, a keyway on the circumference of the winding drum, which is a Cross section corresponding to wedge-shaped ring segment on which a turning organ for carrying and turning the slats depends, leads frictionally, a first firm stop in the keyway against which the ring segment when lowering the Blind curtain starts up and the frictional engagement of the ring segment in the Removed the closed position of the slats, a second fixed stop in the Keyway, against which the ring segment when pulling the blind curtain starts and the frictional engagement of the ring segment in the open position of the slats eliminated, a first pawl that can be lowered into the keyway, which the ring segment at Lowering the blind curtain in an intermediate position between open and Intercept the closed position of the slats.

From DE 3 018 955 a turning device is known in which a keyway is provided on the circumference of the winding drum, in which a corresponding wedge-shaped ring segment is frictionally guided. Is on the ring segment attached the turning organ, which for example as a ladder cord with two vertical support cords and this connecting cord is formed and carries the slats on the bridge cords. Two fixed stops protrude into the keyway into which the ring segment can run against, with the result that the Friction between ring segment and the winding drum is eliminated, that Ring segment of the further rotary movement of the winding drum is therefore no longer follows. The fixed stops are positioned so that they are at a Downward movement of the curtain hold the ring segment in one position which corresponds to the closed position of the lamellae that it Upward movement of the curtain hold the ring segment when the curtain occupies its open position. So if there is a downward movement of the curtain the slats first move into their closed position, the closed curtain can then be lowered. At a The slats first move upwards into their open position, then the completely open curtain can be opened.

From DE 3 718 513 is a turning device of the type mentioned is known which a further development of the turning device according to DE 3 018-955 represents and has a first pawl, which the ring segment at a Downward movement of the curtain in an intermediate position between the open and intercepts the closed position, so that the curtain is always in the Intermediate position is moved down. If so - in any one Blind position the winding shaft over a predetermined, comparatively Line rotation angle - in a direction corresponding to the upward movement of the curtain Is turned back, the pawl is lifted out of the keyway, so that with a subsequent downward movement of the curtain the Ring segment runs against the fixed stop, which is the complete Set the closed position of the slats, and only intercepted by this stop becomes. In contrast, when the curtain moves upwards, the ring segment runs first against the other fixed stop, which is the open position of the slats specifies that the curtain is then raised in the open position. This well-known Turning device has the advantage that the curtain in an intermediate position can be moved to any position, that then by a Short movement reversal the pawl is removed from the keyway, so that when the curtain moves downward again, complete closed position passes. A problem with this known Construction, however, is that removing the pawl from the Keyway only succeeds if the necessary reversal of movement is precise specified rotation angle (interval) corresponds. If this is exceeded predetermined turn angle is the pawl in the keyway, the reversal in the The closed position of the curtain fails.

From DE 2 642 655 a turning device is known in which the The curtain is moved downwards in an intermediate position of the slats. A control member is provided which is axially in a through the winding drum through the axial groove is arranged and as long as in the axial groove Assumes the rest position as long as the drawstring is wound over the axial groove. The Control unit goes in the lower curtain position, namely when the drawstring is so far developed that it releases the axial groove, into an active position, in which the tax body then the turning organ into one of the complete The closed position of the slats moves the corresponding position. At this known turning device, it is disadvantageous that the Upward movement of the curtain only in the intermediate position of the slats can take place.

The structure of the invention is a turning device in the aforementioned Kind in such a way that the curtain in a half-open Intermediate position of the slats down to the lower end position of the curtain can be moved, then in a simple manner by short-sided Raise the curtain and lower again completely can and then up again in the open position of the slats can be moved. An overall simple and reliable working structure of the turning device can be realized.

This task is performed in the turning device in the type mentioned solved according to the invention by a second pawl that can be lowered into the keyway the ring segment when the blind curtain is pulled up in an intermediate position between the open and closed positions of the slats, two on the Shaft rotatably mounted control discs, which, depending on their position, the pawls lower or raise a control element, which in a through the annular groove of the Winding drum is arranged through the axial groove and in the axial groove assumes a rest position as long as the tension band is wound over the axial groove is, and which in a lower curtain position radially from the axial groove in a Active position passes when the band exposes the axial groove and that Control element in the active position with a further rotation of the shaft the first and / or entrains the second control disk via a predetermined setting angle and the two pawls operated to control the ring segment.

The advantages of the invention are in particular that two in the keyway lowerable or removable from the keyway pawls are provided, and that a control member is arranged in an axial groove in the bottom of the winding drum and comes out of the axial groove when the drawstring - in the lower one Blind position - so far developed that it releases the axial groove. The The control member then emerges from the axial groove and enters radial recesses two control discs, which are rotatably mounted on the shaft, so that Control unit via the two control discs, the two pawls for control of the ring segment can operate. Through this constructive design of the Turning device according to the invention, it is possible to turn the Device, and thus the slat inclination depending on the Downward movement or upward movement of the curtain in the desired Act so that the following sequence of movements is realized: The The curtain can be positioned in an intermediate position between the slats Open and closed positions, move down until the curtain has reached the lower end position, in which the drawstring is the lowest End lamella is fastened - to the extent that it releases the control unit until the lower end position is reached, the first pawl is lowered into the keyway, the ring segment is therefore from this pawl, which is in the downward rotation direction the second end stop is intercepted and the other can Do not follow the downward rotation of the winding shaft. Will be after reaching the bottom Position of the curtain slightly raised and then lowered, the two pawls are actuated one after the other by the control device in such a way that the slats are in their fully closed closed position pass. The second jack now falls in during the short reversal of movement the keyway to keep the slats in the Hold intermediate position. It is particularly advantageous that the end of the Reversal path, i.e. the required backward rotation angle for the user can be made visible when the direction of rotation reversal point is reached the second pawl is lifted, causing the slats to become their Leave the intermediate position and want to open up further. This signals the User that the turning point reversal point is reached and by again Lowering the curtain then the closed position of the slats can be reached can.

The advantages of the invention are that after reaching the lower one End position of the curtain two pawls over the emerging from the axial groove Tax body can be controlled in chronological order so that a simple and reliable reversal of the curtain in the slat closed state - is possible by reversing the direction of rotation twice, whereby especially the user the reversal point for reversing the direction of rotation is visually clearly displayed, because at the second reversal point (i.e. the another downward movement) the slats leave their intermediate position and show the tendency to switch to the open position.

According to a preferred embodiment of the invention, the control element occurs with an exposed axial groove, i.e. when the curtain reaches its lower end position and the last layer of the drawstring is unwound from the axial groove, radially in circumferential recesses of the first and the second control disk and takes in after a predetermined first freewheel angle Downward direction of rotation - the first control disc, a predetermined first Setting angle with until the second pawl - from a corresponding control notch on Controlled the outer circumference of the control disc, enters the keyway and that Ring segment against an upward rotation of the shaft (the one Upward movement of the curtain corresponds) intercepts. Another Downward rotation of the winding shaft, the control member takes the first and the second Cam with, with a subsequent upward movement over The first control disk then becomes a predetermined second freewheel angle reset a predetermined setting angle by the control element and lifted the first and the second pawl out of the keyway, the Ring segment is then no longer held by the second pawl, the Slats have the tendency to pass into their open position and signal the user by changing the direction of rotation again - now again in the downward direction. With another Downward movement, the first pawl remains released. The ring segment can run under the first pawl against the second fixed stop, whereby the turning device turns the slats into their closed position. at this downward rotation, the control member takes the two control disks until the two pawls fall back into the keyway.

The first pawl particularly preferably has against the second fixed stop towards a sloping start flank against which the ring segment from the second fixed stop was coming from as the lower closed end position an upward movement and the first pawl out of the keyway presses so that the ring segment can pass under the first pawl. In the event of a further upward movement, the first control disk is moved by the Control unit reset until the second pawl comes out of the keyway lifts, the curtain can be completely in the open position of the slats again be moved upwards. With this upward movement it then wraps Drawstring over the axial groove and presses the control element into it Rest position in the axial groove.

The control member is preferably designed as a pin made of spring material, the under Spring preload is held in the axial direction by the tension band as soon as that Drawstring releases the axial groove, and under its spring preload from the Axial groove emerges. The control element occurs as soon as it emerges from the axial groove can, in tax recesses of the control discs, which are in Extend circumferential direction on the inner circumference of the control discs with which the Control discs on a corresponding rotatable bearing sleeve of the winding shaft are rotatably mounted. The control discs have on their outer circumference corresponding control cam or control notches that with corresponding Approach the catches of the pawls and actuate the pawls.

Advantageous developments of the invention are due to the features of the subclaims characterized.

Fig. 1

einen Längsschnitt durch eine Wendevorrichtung; und

Fig. 2a, b, c bis 16a, b, c

eine schematische Abfolge der Positionen des Steuerorgans, der Steuerscheiben, der Klinken und des Ringsegments während einer Abwärtsbewegung, einer zweifachen Drehrichtungsumkehr in der unteren Endlage des Behangs und einer anschließenden Aufwärtsbewegung des Behangs.

In the following an embodiment of the invention is explained in more detail with reference to the drawings. Show it:

Fig. 1

a longitudinal section through a turning device; and

2a, b, c to 16a, b, c

a schematic sequence of the positions of the control member, the control discs, the pawls and the ring segment during a downward movement, a double reversal of the direction of rotation in the lower end position of the curtain and a subsequent upward movement of the curtain.

Fig. 1 shows a longitudinal section through a turning device 2. On a winding shaft 12, a winding drum 14 is fastened in a rotationally fixed manner and an annular groove 16 their scope. At the bottom of the annular groove 16 there is a tension band 18 attached, for example, by means of a pin 21 which is in the annular groove 16 can be wound or unwound and at its lower end on the End slat of a curtain 28 made up of slats 29 is fastened, cf. 2a to 16a. In addition to the annular groove 16 is on the circumference Winding drum 14 is provided with a keyway 22 corresponding to a cross section wedge-shaped ring segment 30 frictionally receives. To the Ring segment 30, a turning member 26 is attached, which one Contains conductor cord / bridge cord 26a, which on an inner and an outer Carrying cord 26 are attached and the slats 29 carry. Alternatively, you can instead of web cords 26a also other supporting and turning elements on the Attach ring segment 30 for carrying and turning the slats.

The winding drum 14 merges axially into a sleeve 20, which is also non-rotatable the shaft 12 is seated and either integrally connected to the winding drum 14 is or is formed as a separate part. On the sleeve 20 are rotatable first control disk 40 and a second control disk 50 are mounted.

Parallel to the winding shaft 12 is an axial groove 17 on the bottom of the annular groove 16 provided axially under the keyway 22 and under the control discs 40th and extends through 50 and receives a control member 80 which only is shown schematically, consists of a pin made of spring material and with one end is rotatably attached to the winding drum 14, whereas that other end with little radial offset essentially parallel to the Winding shaft 12 runs.

The control discs 40 and 50 have the sleeve 20 adjacent over predefined circumferential angle circumferential recesses 42, 52 and in a predefined one relative angular position to the radial control flanks 43, 53 of the Corresponding circumferential recesses 42, 52 on their outer circumference Control cams or notches 44 or 54. The control cams or notches 44, 54 act with corresponding control approaches 61, 62 and 72 of a first one Control pawl 60 and a second control pawl 70 together, cf. 2 to 16th

In the keyway 22 of the winding drum 14 there is a first one below the winding shaft 12 fixed stop 32 is provided against which the ring segment 30 when lowering of curtain 28, that is to say when the winding shaft 12 rotates forward and eliminates the frictional engagement of the ring segment 30. When creating the ring segment 30 on the first fixed stop 32 take on the turning member 26th resting slats 29 in their closed position.

A second fixed stop 34 is provided in the keyway 22 against which the Ring segment 30 when pulling the curtain 28, that is, when the Winding shaft 12 in the upward direction, starts and the frictional engagement of the ring segment 30 eliminated relative to the keyway 22. When creating ring segment 30 the second fixed stop 34, the slats 29 assume their open position, see. Figures 2 to 16.

2 to 16 show - in a schematic sequence - different positions of the Winding shaft 12, the first control disc 40, the second control disc 50, the first pawl 60 and the second pawl 70 and the control member 80 at Unwinding the drawstring 18, that is to say when the curtain 28 moves downward to the lower end position, a subsequent upward movement and one renewed downward movement into the lower end position of the curtain 28, which then is completely closed.

2a to 16a represent a section along the line B-B and give the Position of the ring segment 30 and the pawls 60, 70 in the keyway 22 again. 2b to 16b represent a section along the line C-C and give the Position of the first control disc 40 and the interaction of the Control cam 44 with the control lugs 61, 62, 72 of the pawls 60, 70 again.

2c to 16c each represent a section along the line D-D and give the position of the second control disc 50 again and that Interaction of the tax notch 54 with the tax rates 61, 62, 72 of the Pawls 60 and 70. The control lugs 61 and 62 of the first pawl 60 and Control approach 72 extend parallel to the shaft 12 over both Control disks 40, 50, thus act with both control disks 40 and 50 together and are therefore also visible on all FIGS. 2b to 16b and 2c to 16c. The control shoulder 72, however, projects radially in the region of the first control disk 40 further into the center of the control disk 40 than in the area of the second Control disc 50.

Fig. 2 shows the beginning of a downward movement of the curtain 28, the Slats 29 are in the open position. During a downward movement it will Ring segment 30 frictionally carried in the keyway 22 and therefore rotates together with the shaft 12 counterclockwise until the Ring segment 30 runs against the first pawl 60, which - from the control cam 61, 62 and the control disk 50 controlled - is lowered into the keyway 22, Position E, and therefore the frictional engagement between keyway 22 and ring segment 30 solves. With the further downward rotation, cf. 3, then the ring segment 30 against the first pawl 60, the slats 29 take the one shown in FIG. 3 Intermediate position between the open position and the closed position. at further downward rotation - counterclockwise - the curtain - in the Fig. 3 shown slat position - moved further down.

In Fig. 4, a position is reached in which the tension band 18 as far from Winding shaft 12 is unwound that it is the axial groove 17 - cf. Fig. 1 - releases. As a result, the control member 80 radially emerges from the axial groove 17 and is located then in the circumferential recesses 42, 52 adjacent to the shaft 12 first and second control disk 40, 50. After passing through a predetermined first freewheel angle during the further downward rotation, cf. Fig. 5, it runs Control member 80 - which is rotatably connected to the shaft 12 - against one Control edge 43 of the first control disk 40 and takes - with another Downward rotation - the first control disk 40 by a predetermined first Setting angle with until the control shoulder 72 in a control notch 44 of the first Control disc 40, and so that the second pawl 70 engages in the keyway 22, Position E to the ring segment 30 in a subsequent Intercept upward rotation, cf. also FIGS. 6 and 7.

7 shows the ring segment 30 decoupled between the two pawls 60, 70; the slats 29 are still unchanged in their working position lies between the open position and the closed position. At a subsequent reversal of the direction of rotation, i.e. with a subsequent one Upward rotation - in the clockwise direction of the winding shaft 12 - runs through it Control element 80 again in the first control disk 40 the predetermined first Freewheel angle and then takes the first control disc 40 over a predetermined setting angle until finally the first pawl 60 and the second Pawl 70 through the control lugs 62 and 72 and the control cam 44 from the Keyway 22 - in position A - be lifted, cf. Fig. 8a and Fig. 10. Will now the upward rotation continues, cf. 10, so runs the ring segment 30 - again in frictional engagement with the keyway 22 - under the second pawl 70, whereby the slats 29 of the curtain 28 now open further. This opening movement should serve as a signal to the user that he can now make the second reversal of the direction of rotation, i.e. a new one Downward movement - winding shaft 12 counterclockwise - can start.

When the downward movement begins again, cf. Fig. 11, both remain Pawls 60, 70 are lifted out of the keyway 22 until the ring segment 30 is therefore passes under the first pawl 60 and finally against a first stop 32 comes to the plant. Since the turning organs 26 firmly with the ring segment 30 are connected, the position of the ring segment 30 in the keyway 22 sets the Inclination angle of the slats 29 fixed. So if the ring segment 30 under the runs through the first pawl 60 against the first stop 32, so that the inclination of the slats 29 changed until the slats completely closed position, i.e. assume its closed position. The curtain is then in its lower end position when fully closed Slats, cf. Fig. 12. At this last downward turn the control takes 80 both control discs 40, 50 with which the two pawls 60, 70 in again lower the keyway 22 - position E, cf. Fig. 12.

The user wants the curtain out of the fully closed bottom Move up or up to the end position, Fig. 12, this will remove it Ring segment 30 from the first stop 32 and runs under the first pawl 60 through and presses against a starting flank 61 during this rotary movement, whereby the first pawl 60 is pressed outwards and the ring segment 30 can pass under the first pawl 60 against the second pawl 70, which of the first control disc 40 and the control lug 72 from the Keyway 22 is excavated into position A, cf. 13 and 14.

With further upward rotation, cf. 14 and 15, the control member 80 rotates the first control disk 40 continues clockwise, the second pawl 70 remains off the keyway 22 excavated, the ring segment 30 can then under the second Run pawl 70, the inclination angle is adjusted during this running movement of the slats 29, these then pass into their open position, cf. also Fig. 16.

In the position reached in FIG. 15, the drawstring 18 again lies over the Axial groove 17 and thereby pushes the control member 80 into its rest position close to the shaft. The disks 40, 50 are reset and in their starting position take their rest position, the control element 80 remains in the rest position, when the drawstring 18 gradually lies on the control element 80 and this in which holds at rest. The ring segment 30 runs - with further upward movement - Against the second stop 34 and is thereby from the keyway dug up again. The slats 29 then maintain this basic position further upward movement, the first pawl 60 is in its engaged position E. returned, the second pawl 70 is lifted out of the keyway, position A.

Claims (10)

1. Tilting device for a gatherable slatted blind with a winding drum (14) transfixed by a winding and tilting shaft (12),
   with an annular groove (16) on the circumference of the winding drum (14) in which a draw tape (18) can be wound and unwound,
   with a tapered groove (22) on the circumference of the winding drum (14) which guides with frictional connection a ring segment (30) of matching tapered cross-section on which a tilting means (26) for supporting and tilting the slats (29) is hung,
   [with] a first fixed stop (32) in the tapered groove (22) against which the ring segment (30) abuts during lowering of the blind, with release of the frictional connection of the ring segment (30) in the dosed position of the slats (29),
   [with] a second fixed stop (34) in the tapered groove (22) against which the ring segment (30) abuts during raising of the blind, with release of the frictional connection of the ring segment (30) in the open position of the slats (29),
   [and with] a first pawl (60) lowerable into the tapered groove (22) that traps the ring segment (30) in an intermediate position between the open and closed positions of the slats (29) during lowering of the blind,
   characterized by a second pawl (70) lowerable into the tapered groove that traps the ring segment (30) in an intermediate position between the open and closed positions of the slats (29) during raising of the blind,
   by two cam discs (40, 50) mounted rotatably on the shaft (12) which lower or raise the pawls (60, 70) depending on their position,
   [and] by a control element (80) which is arranged in an axial slot (17) running through the tapered groove (22) in the winding drum (14) and assumes a rest position in the axial slot (17) so long as the draw tape (18) is wound over the axial slot (17); but in a lowered blind position, when the draw tape (18) uncovers the axial slot (17), the control element (80) moves radially out of the axial slot (17) into an active position in which upon further rotation of the shaft (12) it shifts the first and/or second cam discs (40, 50) through predetermined setting angles and actuates the two pawls (60, 70) controlling the ring segment (30).
2. Tilting device according to Claim 1,
   characterized in that when the axial slot (17) is uncovered, the control element (80) slips radially into circumferential recesses (42, 52) in the first and second cam discs (40, 50) and, after a predetermined first overrun angle with downwards rotation, shifts the first cam disc (40) through a predetermined first setting angle until the second pawl (70) drops into the tapered groove (22) and locks the ring segment (30) against upwards rotation.
3. Tilting device according to Claim 2,
   characterized in that upon further downwards rotation of the winding shaft (12), the control element (80) shifts the first and second cam discs (40, 50), [and] upon an ensuing upwards movement traverses a predetermined second overrun angle and then resets the first cam disc (40) by a a predetermined setting angle, thus lifting the first and second pawls (60, 62 [sic]) out of the tapered groove (22).
4. Tilting device according to Claim 3,
   characterized in that upon a renewed downwards movement the first pawl (60) stays unlatched until the ring segment (30) running freely under the first pawl (60) abuts against the first fixed stop (32), and in that upon further downwards rotation during which the blind reaches its lower, dosed, end position, the control element (80) shifts both cam discs (40, 50) until both pawls (60, 70) drop back into the tapered groove (22).
5. Tilting device according to [any] one [of the] preceding claims,
   characterized in that the first pawl (60) has a sloping lifting flank (61) towards the second stop (34), against which the ring segment (30), coming from the first stop (32) during an upwards movement, abuts, so that the first pawl (60) is pushed out of the tapered groove (22) and allows the ring segment (30) to pass under it.
6. Tilting device according to Claim 5,
   characterized in that upon further upwards movement, the control element (80) shifts the first cam disc (40), which lifts the second pawl (62) out of the tapered groove (22).
7. Tilting device according to Claim 5 or Claim 6,
   characterized in that upon the further upwards movement, the ring segment (30) abuts against the second fixed stop (32) and the control element (80) restores both cam discs (40, 50) to their initial position, and in that upon further upwards movement, the draw tape (18) plunges the control element (80) into its rest position in the axial slot (15 [sic]) of the shaft [sic] (14).
8. Tilting device according to any one of the preceding claims,
   characterized in that the control element (80) emerges from the bottom of the annular groove (16) into the active position under spring preloading as soon as the draw element (18) is unwound and releases the control element (80).
9. Tilting device according to any one of the preceding claims,
   characterized in that both cam discs (40, 50) are rotatably mounted adjacent to the winding drum (14) on a bearing sleeve (15) fixedly connected to the shaft (12) and/or winding drum (14), in that the axial slot (17) extends in the axial direction of the shaft (12) through the annular groove (16) in the co-rotating winding drum (14) and through the adjacent co-rotating bearing sleeve (15), and in that the free end of the control element (80) extends under the control cams (40. 50) within the axial slot (17).
10. Tilting device according to any one of the preceding claims,
    characterized in that the cam discs (40, 50) have cam notches or bumps (44, 54) that lower the two pawls (60, 70) into the tapered groove (22) or lift them out of the tapered groove (22).

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