EP2634354A2 - Building opening shading device, reel unit and replacement lift belt unit thereof - Google Patents

Abstract

The unit has a reel (3) and a reversing cord holder accommodated in a building-side fastenable housing (1). The housing includes openings for a winding shaft, a bottom-side outlet opening for a lifting tape (2), and outlet openings (7) for reversing cord strands in sides located in a rotation axis direction. The housing includes a reclosable revision opening, which is non-destructively exposed from bottom and partially covered by outlet walls (5, 6). A winding section of the reel is accessible from bottom through the revision opening for exchanging the lifting tape. An independent claim is also included for a building opening shadowing device.

Description

The invention relates to a reel unit for a Venetian blind according to the preamble of claim 1, an elevator tape exchange unit therefor according to the preamble of claim 12 and a building opening shading apparatus according to the preamble of claim 13.

In modern external blinds, the winding shaft is usually on so-called reversing gear on building-side components, usually a header of the Venetian blind, stored. Generic reversing gears are manufactured for example by the companies Schüco and Hunter-Douglas. The invention relates to a refinishing unit designed as a further development of such a reversing gear.

Reverse transmissions of the generic type usually have a provided with openings for performing the winding shaft housing in which a normally pushed onto the winding shaft form-fitting bearing sleeve are mounted, whereby the winding shaft is fixed on the housing side rotatable. The bearing sleeve accommodated in the housing has a further function in addition to the bearing function: It also serves as a reel for winding and unwinding an elevator belt releasably securable at one end thereof, which passes through the slats of the external venetian blind and engages the lower end strip with its other end so that the curtain can be opened and lowered by winding and unwinding the elevator belt on the bearing sleeve designed as a reel. Usually, the reversing gear further includes a turning unit for actuating the turning belts, whereby the name reversing gear derives. The invention relates to such a reverse gear. In the context of the present application, however, is spoken by a "reel unit", because the invention would also bring benefits if the reversing gear would have no turning device for actuating the acting on the long sides of the slats of the Venetian blind turn bands for the purpose of up and Zujalousieren and this would be done in other ways.

The circumference of the winding belt winding on the reel is thereby formed by the diameter of a winding section of the reel or a circumferential section provided for winding the elevator belt and a part of the hoisting belt wound thereon, and therefore varies during winding or draining of the blind. The housing of the reel unit or the turning friction therefore has a lift belt outlet opening in its installed state, which is approximately at the level of a vertical plane through the axis of rotation of the winding shaft and is usually designed as a narrow gap or at least on one side a deflection edge or Outlet wall, at which the elevator belt is deflected by the winding circumference on the reel, approximately in the vertical plane through the axis of rotation, so that the Venetian blind curtain comes to hang with the desired distance in front of the window or the like, regardless of how much or how little of the elevator belt is wound on the winding section of the reel or not.

Furthermore, reel units or reversing gearboxes of the generic type usually have a reversible drawcord holder for pivoting the louvres of the external blind control gear to the reel. For this purpose, the turn-cord holder can be accommodated, for example, on a cylinder neck of the reel by way of a ring spring which serves as a friction clutch and surrounds a set of stops at its outer circumference, to which a corresponding set of counter-stops on the housing is assigned, via which the turn-cord holder is held in a rotationally fixed manner is, as long as the curtain is opened or lowered, so long as the elevator belt from the reel up or unwound and about which the turning cord holder released only to co-rotate is when the curtain reaches its lower end position, so that only then can be lolled and fastened to the ring spring reversing cord holder does not slip together with the annular spring on the cylinder portion of the reel, but is taken in the direction of rotation. Of the turncord holder depends on both sides of the axis of rotation in each case a Wendekordelstrang down. At the reversible cord strands, the reversing bands attached opposite one another on the longitudinal sides of the curtain slats can be suspended. Accordingly, the housing in the installed state on bottom outlet openings through which the two sets of drawstring are led out down, the two sets of reversible cord can be performed either on a center of the turncord holder top attached turncord or as two separate reversible cords or -stricke or bands.

The German patent application DE 102 36 869 A1 discloses a generic reverse gear. Such reversing gears have proven themselves in practice. However, it is difficult to remove the external venetian blind for inspection purposes and reinstall it at the reversing gearbox.

It is therefore an object of the present invention to provide a building opening shading device and a reel unit and an elevator band exchange unit therefor, which facilitate the maintenance of the building opening shading device.

This object is achieved with regard to the reel unit having the features of claim 1, with respect to the elevator band interchange unit having the features of claim 12, and with regard to the building opening shading device having the features of claim 13.

According to the invention, the housing of the reel unit for this purpose has a bottom-side, through the at least one outlet wall covered, destructive freely exposable and resealable inspection opening, through which the winding section of the reel to replace the elevator belt from below is accessible. "Covered by the at least one outlet wall" means that the inspection opening is larger than the exhaust opening, which is normally narrowed on both sides of the axis of rotation by outlet walls. In the sense of a largely closed bottom of the reel unit in order to encapsulate their moving parts as well as possible against the weather, etc., the inspection opening is further covered by a preferably detachable from below revision cover arrangement, on which the at least one outlet wall of the elevator belt outlet is formed on the elevator belt is deflected.

Since the elevator belt outlet opening is normally designed as a narrow gap with closely adjacent outlet walls on both sides of the vertical plane through the winding shaft rotation axis, the outlet wall opposite the outlet wall is advantageously also formed on the inspection cover assembly, which also in Drehachsrichtung, i. in both axial directions of the winding shaft axis of rotation, can extend beyond the elevator belt outlet opening to the outside, so that the access to the winding portion of the reel is facilitated.

Due to the exposed inspection opening, the end of the elevator belt, which is detachably fixed at the concentric winding section of the reel, can be seen from below and therefore easier to detach. Furthermore, the winding section of the reel is accessible from below to replace the turning belt through the inspection opening. There, the elevator belt can be looped around a fastening mandrel which can be inserted through the housing in the region of the winding shaft receiving opening in a rotation-parallel manner on the reel and parallel to it. The provided at the end of the strap loop must therefore be introduced from below into the housing and placed there around the same time to be inserted from the side mounting arbor. With an inventively provided, large inspection opening with a clear view into the housing interior and on the winding section of the reel on which the looping has to take place, manages the necessary handling with Fastening mandrel and elevator belt, which would not be possible due to the lack of visual contact through the narrow elevator belt outlets previous reversing gears, which is why previously the reversing gearbox often had to be completely removed when the curtain had to be removed.

"Accessible from below" or "viewable from below" in connection with the winding section of the reel means that the winding section of the reel is accessible and visible when the reel unit is installed for a fitter below the reel unit usually mounted above a window or the like So from below.

In the context of the inspection cover arrangement, "detachable from below" means that the inspection cover arrangement can be loosened in the case of a reel unit installed on an external blind or the like for a fitter below the window or the like which is normally mounted above a window or the like, ie from below. However, it does not mean that the inspection cover assembly must necessarily be detachable in parts or as a whole in a vertical downward direction.

Rather, the inspection cover assembly can be formed in different ways. According to an advantageous embodiment, the inspection cover assembly, for example, on two hinged to both sides of the axis of rotation at the edge of the inspection opening inspection flaps.

According to an alternative development, the inspection cover assembly on a bottom side on the housing from below releasably secured inspection cover. The inspection cover can preferably be attached with clips or latched to the housing, so be clipped example, at the edge of the inspection opening. However, it would also be possible to provide a revision cover which can be pushed in a direction of rotation axis over the inspection opening, as long as the inspection cover for a mechanic from below can be solved. For example, the inspection cover could be dovetailed or T-shaped upwardly projecting from its top protrusions in associated, undercut recesses on the housing bottom are hooked laterally next to the inspection opening. Alternatively or additionally, latching connections could be provided at the edge of the inspection opening. Likewise could be provided on both sides of the rotation axis on the bottom side of the housing edge downwardly projecting locking projections, which are undercut at the side facing the inspection opening. The inspection cover could then have at its in Drehachsnormalrichtung outboard side edges each have a latching projections associated latching leg. The locking legs may have in the direction of rotation axis normal direction outwardly facing, on its side facing away from the inspection opening side undercut locking lugs so as to be able to be latched to the housing-side locking projections. A revision cover designed in this way also advantageously has, in addition to the outlet slot for the elevator belt, passage slots for the reversing cord strands.

With a revision flap assembly comprising two in the vertical plane by the Aufzugbandauslassschlitz successive inspection flaps, which are articulated in each case on the outermost, parallel to this vertical plane housing edge, an installer can simply expose the inspection opening by folding the two inspection flaps.

This is also easily achieved if one or more inspection covers are provided, which can be unscrewed from below, for example, with screws running in the vertical direction (in the installed state of the reel unit). However, it is even easier with a revision cover arrangement having one or more such revision covers, when the connection to the housing is formed by a clip connection.

The inspection cover can extend to both sides of the elevator belt outlet slot and does not necessarily have to be divided. He can then be removed as a whole, with only the elevator belt when hanging the new curtain must be threaded through the trained on the inspection cover lift tape outlet slot, it would be conceivable to bring elevator tapes with threaded revision cover as a prefabricated elevator belt replacement unit as a spare part factory-assembled in the trade.

It is particularly advantageous if the inspection cover is bounded on both sides parallel to the axis of rotation by a downwardly projecting, resilient latching leg on the outside of a locking lug protrudes, which is in rear grip on a corresponding undercut on a rotation axis parallel to the housing wall facing. If the locking leg thereby projects down over the ground level on the housing, it can be used by a mechanic as a handle for unlatching, the size of conventional reversing gears and thus the inspection cover is usually such that a fitter both locking legs with one hand inside Press and thereby solve the inspection cover from its holder on the housing. Of course, corresponding, downwardly projecting and serving as handles leg can also be provided on designed as flaps revision covers.

Furthermore, it is advantageous if the inspection cover arrangement extends at least in an area surrounding the winding-belt outlet slot on both sides of the vertical plane through the winding shaft rotation axis up to a housing outer wall located in the direction of rotation axis and forms part of it there. That is, when the inspection opening drehachsnormal limiting side wall of the housing at the bottom edge of the inspection opening has a lateral access area forming material recess, wherein on the inspection cover assembly a access area covering number side wall segments is provided, so if the inspection cover assembly in the material recess the axial outer wall of the housing forms. This achieves a further improved access to the winding section of the reel for a fitter standing below the reel unit with more Space for access to the winding section, so that the hanging and unhooking of the associated elevator belt is further simplified.

In this case, as usual, on both sides of the winding circumference of the reel, a winding portion axially delimiting ring portion or the winding portion axially delimiting, annular socket provided, it is advantageous if the winding portion on the broken sidewall or the outer wall of the housing facing side annular limiting version of the reel also has a corresponding material recess, and that at a location on the reel scope at the position point, which is completely congruent with fully unwound elevator belt with the lateral access area, so pointing down, so that the access to Winding section is facilitated from below by more space on the otherwise limited by the housing outer wall inspection opening and the otherwise bounded by the annular housing winding section.

In many cases, however, reverse gear or reel units are constructed on a bottom of a U-profile arranged as a head strip, the bottom of the head strip then in the reel unit has a corresponding recess for the implementation of the elevator belt and optionally the reversible tapes, wherein the passage opening then According to the invention is kept so large that the inspection cover assembly can be removed from below through the passage opening therethrough. However, an access from the side of the reel unit is then not possible, so that the above-described formation of a lateral access area runs into emptiness and also a co-rotating drehachsparallel recorded on the reel attachment mandrel which is led out laterally from the reverse gear housing and the elevator belt may be looped around, thereby releasably secured to the winding portion of the reel, for a mechanic from below out of reach. To release the mounting mandrel, therefore, the head strip would have to be removed, are usually attached to the generic reversing gear.

Therefore, a further development of the invention is particularly advantageous in which the end of the elevator belt intended for mounting on the winding section of the reel is connected to a driver block which can be loosely (eg clipped) in an associated driver recess on the winding section of the reel, or at least loosely from below ) is recorded. The Mitnehmersteinaufnahme located on the winding section in its lowest position, it can be removed from the bottom after loosening the inspection cover the elevator belt together with the Mitnehmerstein without the need for lateral access to the reel unit is necessary. Zumidnest if the drive dog is loosely received in the Mitnehmerausnehmung, he must be performed on the outer peripheral side along its desired path on the winding portion of the reel, at least until it is covered by so many layers of the elevator belt that release from the Mitnehmerausnehmung at the winding section Unwinding and unwinding the external blind control is excluded.

For this purpose, an outer peripheral guide track for the driver block forming support wall segments are advantageously provided, on which the driver block is supported on the outer circumference of the winding portion of the reel, and particularly preferably to both located in Drehachsrichtung sides of the elevator belt. The support wall segments may, for example, extend downwardly from the upper-side outer wall of the reversing gear housing and comprise the outer circumference of the winding section of the reel at least in the upper semicircular cross-sectional segment. However, the lower part of the outer peripheral side guideway forming support wall segments are not particularly connected to the walls of the reversing gear housing, but with the inspection cover, and thus extend from the inspection cover upwards to there the lower particularly preferred semi-circular cross-sectional portion of the outer peripheral side guideway form. Because then the lower support wall segments together with the inspection cover by the Inspection opening are removed, so that the point at which the elevator belt is fixed on the loosely received in Mitnehmerausnehmung Mitnehmerstein releasably secured to the winding portion of the reel, not only from below can be exposed, but at the same time the connection with the reel is released, because the lower Part of the outer circumferential guideway is removed and thus the way for the Mitnehmerstein down from the inspection opening is free.

Due to the fact that the inspection cover arrangement is designed as a revision insert which can be introduced into the inspection opening of the reel unit with the underside revision cover and support wall segments extending upwards on both axial sides, attachment of the elevator band to the winding shaft circumference of the reel can be carried out in a particularly easy manner by dismantling or disassembling said Mitnehmerstein be realized. The revision insert can also be designed as a clip-on revision cover arrangement analogous to the above-described revision cover.

It is particularly advantageous if the elevator belt outlet opening is bounded on both sides parallel to the axis of rotation by an outlet wall, wherein the two outlet walls are formed on spring legs of Revisionscheschubs biasing the two outlet walls to each other. As a result, the elevator belt is clamped during the exchange, ie when withdrawn from the inspection opening inspection slot between the two outlet walls, so that when the fitter pulls from below on the elevator belt, and holds the revision insert while the Mitnehmerstein automatically into the past for insertion into the bottom facing Mitnehmerausnehmung correct position is pulled.

In order to subject the outlet while no unnecessary wear and not unnecessarily complicate the mounting and deflation of the curtain, it is advantageous if the two outlet walls on the in Drehachsrichtung projecting on both sides of the inspection opening and on the housing to the located in both axes of rotation axes sides of the inspection opening is an expanding mandrel which penetrates when inserting the Revisionscheschubs in the inspection opening between the two mutually biased outlet walls and this spreads apart and thus releases the elevator belt outlet ,

In particular, in the above-described development with the mutually prestressed Aufzugbandauslasswänden, but also in other embodiments in which a thin lift tape outlet is desired to protect the inner parts of the reel unit from contamination, the Mitnehmerstein can not durchfädeln together with the elevator belt through the elevator belt outlet. The Mitnehmerstein could therefore analogous to the above-mentioned attachment of the elevator belt with an end loop on a winding section of the reel from the side insertable mounting mandrel also be attached via a retractable and removable mounting mandrel on Mitnehmerstein so that the elevator belt after threading through the on Revisionseinschub provided lift band outlet opening can be attached to the Mitnehmerstein.

According to an alternative or additional advantageous development of the invention, however, the attached to the Mitnehmerstein elevator belt is part of a prefabricated elevator belt replacement unit, the Mitnehmerstein suitable for loose recording in Mitnehmerausnahme at the winding section of the reel and the elevator belt replacement unit further has the threaded onto the elevator tape revision insert, which may have the features explained above.

Figur 1

eine perspektivische Ansicht von schräg unten auf eine als Wendegetriebe ausgebildete Haspeleinheit gemäß einer ersten Ausführungsform der Erfindung;

Figur 2

die in Figur 1 dargestellte Haspeleinheit mit abgenommenem Revisionsdeckel;

Figur 3

eine als Wendegetriebe ausgebildete Haspeleinheit gemäß einer weiteren Ausführungsform der Erfindung;

Figur 4

die in Figur 3 gezeigte Haspeleinheit mit aufgeklappten Revisionsklappen und abgezogenem Befestigungsdorn;

Figur 5

eine als Wendegetriebe ausgebildete Haspeleinheit gemäß einer weiteren vorteilhaften Ausführungsform der Erfindung in einer den Figuren 1 und 3 entsprechenden perspektivischen Ansicht;

Figur 6

die in Figur 5 gezeigte Haspeleinheit mit einer nach unten abgezogenen Aufzugbandaustauscheinheit mit einem an einem Mitnehmerstein befestigten Aufzugband, auf das ein Revisionseinschub aufgefädelt ist;

Figur 7

eine Schnittansicht in einer normal zur Wickelwellendrehachse verlaufenden Schnittebene in etwa in der Mitte der in Figur 6 zu erkennenden Revisionsöffnung; und

Figur 8

eine perspektivische Ansicht von schräg unten auf eine als Wendegetriebe ausgebildete Haspeleinheit gemäß einer weiteren Ausführungsform der Erfindung.

Further features and advantages of the invention and advantageous developments of the invention will be explained in more detail with reference to the embodiments of the invention shown in the accompanying drawings. Show it:

FIG. 1

a perspective view obliquely from below of a reel unit designed as a reversing gear according to a first embodiment of the invention;

FIG. 2

in the FIG. 1 reel unit shown with removed inspection cover;

FIG. 3

a reel unit designed as a reverse gear according to a further embodiment of the invention;

FIG. 4

in the FIG. 3 reel unit shown with unfolded inspection flaps and withdrawn attachment pin;

FIG. 5

a reel unit designed as a reverse gear according to a further advantageous embodiment of the invention in a FIGS. 1 and 3 corresponding perspective view;

FIG. 6

in the FIG. 5 reel unit shown with a downwardly withdrawn elevator belt replacement unit with an elevator belt attached to a Mitnehmerstein on which a Revisionseinschub is threaded;

FIG. 7

a sectional view in a direction normal to the winding shaft axis of rotation extending cutting plane approximately in the center of in FIG. 6 to be recognized revision opening; and

FIG. 8

a perspective view obliquely from below of a reel unit designed as a reverse gear according to a further embodiment of the invention.

First, the in the FIGS. 1 and 2 illustrated embodiment of the reel unit according to the invention are explained in detail. With reference numeral 1 In this case, a housing of the reel unit is designated, in which a reel 3 is mounted, at the winding section 16 of which an elevator belt 2 with a loop provided at one end can be detachably looped in or out via a fastening mandrel 4 which can be inserted from the side into an associated receptacle of the reel 3 is attached.

In the FIG. 1 it can be seen that a gap-shaped lift belt outlet opening formed between two outlet walls 5, 6 is relatively narrow because the elevator belt 2 is to be guided in a defined vertical plane, so that the position of the curtain does not move towards or away from the building opening to be shaded regardless of how much of the elevator belt 2 is wound on the winding section 16 of the reel 3 or not. One of the two outlet walls 5, 6 must therefore serve to deflect the elevator belt 2 from the winding circumference on the reel, which is formed by the diameter of the winding section and the wound thereon part of the elevator belt, approximately in the desired vertical plane. The outlet opening is therefore as narrow as possible in order to encapsulate the inside of the reversing gear unit shown as well as possible against the weather, as well as the housing 1 is closed as much as possible and next to the elevator belt outlet only contains outlet openings 7 for reversing cords, the co-rotating via a co-rotating on the reel 3 recorded turncord holder are ultimately attached to a winding shaft, which can be inserted through lateral openings in a winding axis normal axis arranged outer shaft 17 and a parallel thereto, opposite outer wall in the housing 1 in a central winding shaft receiving the reel 3.

In order to make the attachment point of the elevator belt 2 to the winding section 16 of the reel 3 accessible to a fitter in a desired replacement of the elevator belt 2, thereby facilitating the threading of the loop at the end of the elevator belt 2 around the mounting arbor 4, is an inspection cover provided, which is designated overall by 8 and the elevator belt exit gap encloses on all sides, on which therefore also the two outlet walls 5, 6 are formed.

The inspection cover 8 extends on both sides of the vertical plane through the axis of rotation of the winding shaft with a bottom portion 20 close to the edge of the housing, where on both sides of the bottom portion 20, a locking leg 21 projects downwardly, on which an outwardly directed locking lug 22 is provided ,

The two locking legs 21 stand, as in FIG. 1 can be seen, with their lower ends over the bottom of the housing 1 and can thus be grasped and compressed by the fitter with one hand to the inspection cover 8 from its an inspection opening (see FIG. 2 ) concealing position (see FIG. 1 ) to solve. The inspection opening extends in a spanned between the two laterally perpendicular to the plane located by the outer walls outer wall portion of the bottom over the entire width of the winding portion 16 and the width of two winding portion 16 annular enclosing ring sockets 13, 14, and one of the axial Side wall 17 broken out area, which is covered by a projecting from the bottom portion 20 vertically upwardly wall portion 15 of the inspection cover 8 in the operating position of the reel unit and is released upon removal of the inspection cover 8.

In order to provide access and insight into the winding section 16 and in particular the attachment point of the elevator belt 2 to the winding section 16 in this covered by the wall portion 15 lateral region, the Axialseitenwand 17 facing annular socket 14 has a with the material recess in the axial side wall 17 in approximately congruent Recess area, which is located at a position of the reel circumference, which points at fully unwound Raffstoreaufzugsband 2 down ( FIG. 2 ).

Around the mounting pin 4, by which the elevator belt 2 is looped around with its end loop, store captive on the reel 3, the mounting mandrel 4 is provided with a bent head, the two in Drehachsrichtung on led out of the housing 1 circumference of the winding shaft receiving the reel 3 projecting locking legs 12 are associated with a clip attachment.

The Figures 3 and 4 show a further embodiment of the invention, as a development of a generic reversing gear running reel unit. The reel unit has a housing 101, which in its outer dimensions substantially similar to that in the FIGS. 1 and 2 shown embodiment and can be taken with one hand. The reel contained therein 3, the elevator belt 2 and the attachment of the elevator belt 2 on the mounting mandrel 4 are identical, as are the outlet openings 7 for the reversible cords, which received on a cylindrical pin of the reel 3 via a serving as a clutch ring spring reversible cord holder per winding shaft can be actuated, wherein for engaging and disengaging corresponding stops are provided on the housing inner walls and on the turning cord holder.

However, instead of a clip-on revision cover, the local revision cover arrangement has two inspection flaps 108, 109 hinged to both sides of the axis of rotation of the winding shaft, the dividing plane of the inspection flaps 108, 109 extending through the elevator belt outlet gap formed between the outlet walls 5, 6. As in the previously described embodiment, located at the axial end of the housing 101 side wall 117, at which the winding portion 16 of the reel 3 with its ring socket 14 connects, on its side facing the bottom of the housing a material recess or an exposed point in the area around the elevator belt outlet gap, which is provided in the bottom of the housing 101 and covered by the inspection flaps 108, 109 Inspection opening added to the side. On the inspection flaps 108, 109, however, each upwardly projecting side wall portions 115, 116 are provided, which complement the axial side wall 117 in the closed state of the inspection flaps 108, 109 and abut each other in the closed state with their end faces, so that the inspection flap assembly 108, 109 secured against unintentional opening. It can also be seen that the end faces of the side wall sections 115, 116 of the inspection flaps 108, 109 are slightly bevelled or rounded in their upper region, so that it is even possible to open the inspection flaps 108, 109. The inspection flaps 108, 109 could be hinged on film hinges at the edges of the inspection opening. In the example shown, however, hinge eye portions 111 are formed on the housing and in each case a hinge eye portion 10 on the inspection flaps 108, 109, which enclose a hinge pin.

Finally, reference is made to the FIGS. 5 to 7 which show a particularly preferred embodiment of the invention.

The reversing gear shown there has a housing 201, which although in its outer dimensions also corresponds approximately to that of the embodiments shown in the preceding figures, but has been greatly modified in essential details. In the housing 201, a reel 203 is mounted, at the winding portion 216 ( FIG. 7 ), the elevator belt 2 is not directly attached, but is guided over a loosely inserted in an associated driver receptacle on the reel Mitnehmerstein 225, on which in turn the elevator belt is herumgeschlauft in the manner already discussed to a bolt 204, which, however, fixed and subsequently no longer destructive releasably connected to the driving block 225.

In order not to keep firmly connected to the winding section 216, but only loosely inserted Mitnehmerstein 225 on its path during winding and unwinding and thus the winding and unwinding of the reel 3 is not firmly connected, but only about the Mitnehmerstein 225 set Elevator bands 2 to allow ever, vertical support wall segments 213, 227 are provided, which surround the outer circumference of the winding portion 260 and thereby form a guideway, which hold the Mitnehmerstein 225 in the Mitnehmerausnahme on the winding section 216. The support wall segments 213, 227 are provided to both, located in the axial direction of the winding shaft sides of the elevator belt 2 so as to accommodate the elevator belt 2 between them. In the FIG. 7 they are thus in front of and behind the page.

The upper support wall segments 227 are integral with the housing 201 and extend downwardly from the upper-side cover wall of the housing 201 and form the upper, semi-circular in cross-section part of the guideway. The lower support wall segments 213 are, however, as in particular in FIG. 6 is part of a Revision Einschubs, which is designated overall by reference numeral 208. They extend from a bottom-side inspection cover portion 220 of the revision insert 208 in a vertical upward direction and form the lower, in cross-section also semicircular part of the guide track for the driving block 225th

The revision insert 208 covers in the installed state, between the two edges of the housing 201 on both sides of the winding shaft axis of rotation and the width of the winding portion 216 across extending inspection opening and can be used in this as a whole and removed from this again.

For this purpose, the revision insert 208 two downwardly projecting locking leg 221, which are arranged on its two sides and each having an outwardly projecting locking lug 222, which extends into an associated recess on the associated vertical and parallel to the vertical plane through the axis of rotation Wall of the inspection opening engages shaped recess and thus stands in the rear grip with the undercut formed there.

With the revision insert 208, the elevator belt 2 and the driving dog 225 attached thereto can be removed from the reversing gear at the same time when the reel 3 is in the in FIG. 7 shown position with fully unwound elevator belt 2 and downwardly directed Mitnehmerausnahme.

Therefore, factory-prefabricated elevator belt replacement units are advantageous, in which the elevator belt 2 with the driving block 202 fastened thereto is threaded through the elevator belt outlet opening formed on the revision insert 308 between two outlet walls 205, 206, since the driver block 225 does not fit through the elevator belt outlet opening.

The two outlet walls 205, 206 forming the elevator belt outlet opening are in each case formed on a spring leg 235, 236 projecting from the inspection cover and are thereby biased toward one another. If the revision insert 208 is in its in FIG. 5 shown in the housing 201, the inspection opening covering, built-in position, so the two outlet walls 205, 206, which project in both Wickelwellenaxialrichtungen over the inspection opening, spread over the housing on both sides of the access opening Spreizdorne 219 so that the winding and unwinding of Elevator bands 2 is not obstructed.

On the other hand, if the revision insert 208 is pulled out of the inspection opening or if a new revision insert 208 is to be inserted together with the elevator belt fastened to the driver block 225 into the inspection opening and thus into the housing 201, the two outlet walls 205, 206, which in the example shown press one bead-like shape, which is particularly suitable as a deflection for the elevator belt 2, against each other and thus keep the Mitnehmerstein 225 in the desired, in FIG. 6 shown installation position, which in addition by markings on Supporting wall segment 213 can be read.

In this way, it can be ensured that the driver block 225 finds its way into the driver section on the winding section 216 of the reel 203 during installation. The self-discovery of the way in the Mitnehmerausnahme is supported by the rounded or alternatively triangular shape of the Mitnehmersteins 225 and the associated Mitnehmer exception on the winding section 216, so that the installation succeeds even if the reel 203 with respect to their in FIG. 7 shown slightly rotated position.

Finally, the driver block 225 in its located between the support wall segments 213, 227, axially central portion of the Mitnehmerausnehmung protruding lugs 234, over which it is guided between the support wall segments 213, 227 in the axial direction.

Modifications and modifications of the illustrated embodiments are possible without departing from the scope of the invention.

Thus, the reversing gear shown could also be formed without turning unit, ie without reversing cord holder purely as a winding shaft bearing with built-in reel for the elevator belts, if they are to be used in building opening shading devices in which the fins do not have to be turned, or where separate turning devices are provided. However, in building opening shading devices such as venetian blinds, reel units have proven effective, which are provided with reversible cord holders for the reversing cords and an associated coupling mechanism, and are commonly referred to as a reversing gear. In most cases, the turncord holder is seated on this cylinder journal via a ring spring placed around a cylindrical journal of the reel and has on its outer circumference certain stops which are assigned a counter-abutment on the housing in order to block the turning of the disks during the hanging process. Furthermore, it would be conceivable, contrary to in FIG. 1 shown embodiment with vertically downward peelable inspection cover 8 to use in the axial direction on the housing bottom and attachable there inspection cover to be used, as long as it is solvable for an installer from below. A corresponding embodiment of the reel unit according to the invention is in the FIG. 8 shown.

Im in the FIGS. 5 to 7 shown embodiment corresponding housing 201 is a reel 3 and a not recognizable turnable cord holder housed. From the reel 3 an elevator belt 2 hangs down, which is herumgeschlauft with its one end in the manner explained above via a laterally insertable mounting arbor 4. From the spiral cord holder hang down on both sides of the axis of rotation of the reel 3 and a winding shaft on which the reel 3 can be pushed down two spiral cord strands 30, which in FIG. 8 are drawn in a deflected position. However, this deflection is effected only by mounting the sliding from the axial side inspection cover 308 on the housing bottom. The turning tapes are thus in the same vertical normal plane to the axis of rotation as the elevator belt 2 of the associated reversing gear, so that there is a more aesthetic visual appearance of the Raffstorebehangs, because the field of view is divided by less vertical lines.

The inspection cover 308 in this case has two in a displacement direction, in which the hanging from the housing 1 reversing cord 6 are redirecting opening Umlenkekelumlenkschlitze 34, and a Wendekordelumlenkschlitzen 34 intermediate lift tape passage slot with the outlet walls 305, 306, of which at least one as a deflection for the elevator belt 2 from the winding circumference on the winding section of the reel serves approximately in the vertical plane through the axis of rotation. Otherwise, however, the cover completely conceals the inspection opening in its mounted state and thus encapsulates the interior of the housing against damage from the outside.

The provided at the bottom of the housing 201 outlet openings 207 for the reversible cord strands 30 thereby extending in a direction in which the reversible cord strands 30 are deflected, and also serve as suspensions for T-shaped from the top of the inspection cover 308 upwardly projecting projections 33rd The outlet openings 207 are widened on their opposite side to the direction of displacement, so that the projections 34 can be brought into engagement with the outlet openings 207 when attaching the inspection cover 308.

To initiate the forces acting on the inspection cover 308 by the deflection of the reversible cord strands 30 from the inspection cover 308 in the housing 201 and thus ultimately in a building side fixed component, the inspection cover 308 on both side edges of the axis of rotation on a resilient locking leg 321, which at its rear , opposite to the direction of displacement end carries a lying on the opposite side of the shift direction undercut catch 322, wherein in the example shown, the undercut is provided only in an upper portion of the latch 322, so that the lower portion of the latch 322, which is not undercut as handle can be used particularly well when moving the lid in the axial direction along the housing bottom along. Each latching leg 321 or each latching lug 322 is associated with a housing side edge downwardly projecting latching projection 32 which is undercut on its side in the direction of displacement, so that the inspection cover 308 can be brought with the locking lugs 322 in the rear grip on the latching projections 32, whereby the resulting by the deflection of the reversible cord strands 30 forces are introduced into the housing 201.

It would also be a combination of in the FIGS. 5 to 8 embodiments shown conceivable, such that in the inspection opening in the FIGS. 5 to 7 shown revision insert 208 is inserted, and there shown reel 203 is used with the cam receiver to achieve the thus particularly simple assembly and disassembly of the elevator belt at the winding section, and in addition the FIG. 8 shown revision cover 308 is placed from below on the housing 201 to cause the desired optical deflection of the reversible cord strands 30.

Claims (14)

Reel unit for a venetian blind, with
a reel (3; 203) which can be received in a rotating manner on a winding shaft and has a central winding shaft receptacle and a winding section (16; 216) concentric therewith for winding and unwinding an elevator belt (2) releasably securable at one end thereof;
preferably one for pivoting slats of the Venetian blind to the reel (3; 203) rotatably engageable reversible cord holder, from which a turn cord string hangs down on both sides of the axis of rotation,
in which the reel (3; 203) and preferably the turn cord holder is housed, which in openings in the rotational axis openings for the winding shaft and a bottom outlet opening for the elevator belt (2) and preferred for each reversible cord strand, wherein the elevator belt outlet opening is in a region enclosing a vertical plane through or parallel to the axis of rotation, and bounded on both sides parallel to the axis of rotation by an outlet wall (5, 6; 205, 206; 305, 306) in that the elevator belt (2) is deflected by the circumference of the winding on the winding section (16; 216) of the reel (3; 203) approximately in the vertical plane, characterized in that
the housing (1; 101; 201) for replacement of the elevator belt (2) has a bottom opening, destructively exposable and recloseable inspection opening which is larger than the elevator belt outlet opening, so that the winding section (16; 216) of the reel (3 203) being accessible from below through the exposed inspection opening, the inspection opening being covered by a detachable inspection cover arrangement (8; 108, 109; 208; 308; 208, 308) on which the outlet walls (5, 6) bounding the elevator belt outlet opening are covered 205, 206, 305, 306) are formed. A reel unit according to claim 1, characterized in that the inspection cover assembly (108, 109) has two (11, 12) inspection flaps (108, 109) hinged to both sides of the axis of rotation at the edge of the inspection opening. A reel unit according to claim 1, characterized in that the inspection cover arrangement (8; 208; 308; 208, 308) has a base (21; 22) detachably fastened from underneath, preferably clipped on the edge of the inspection opening (21, 22; 221, 222) has inspection cover (8; 208; 308). A reel unit according to claim 3, characterized in that the inspection cover (8; 208) is bounded on both sides parallel to the axis of rotation by a downwardly projecting, resilient latching limb (21; 221) on the outside of which a latching lug (22; which stands in the rear grip on a corresponding undercut on a rotation axis parallel housing wall facing the axis of rotation. Reel unit according to one of the preceding claims, characterized in that a fastening mandrel (4; 204) accommodated in co-rotation with the coiler (3; 203) is provided around which the end of the elevator belt (2) releasably fixable on the winding section (16; can be looped around. The reel unit according to one of the preceding claims, characterized in that a side wall (17; 117) of the housing (3) which rotates normal to the inspection opening has a material recess forming a lateral access area at the bottom edge of the access opening, and one the winding section (16) on the latter Side wall (17; 117) facing side annularly limiting socket (14) of the reel (3) has a material recess which is approximately congruent with the lateral access area when the elevator belt (2) is completely unwound, wherein on the inspection cover arrangement (8; 108, 109) a the number of side wall segments covering the access area (15, 115, 116) is provided. The reel unit as claimed in claim 5 or 6, characterized in that the fastening mandrel (4) has a head section led out of the housing (3) at one of the winding shaft openings, from which it can be detached from its reel-parallel receptacle on the reel (3), wherein it is preferred a clip holder (12) assigned to the head section is formed on a section of the reel (2) led out of the housing (3) at the winding shaft openings. A reel unit according to any one of the preceding claims, characterized in that on the winding portion (216) of the reel (3) a Mitnehmerausnahme for loosely receiving a Mitnehmersteins (225) is provided, on which the elevator belt (2) is fixed with its one end, wherein a Outer circumferential guide for the driving block (225) forming support wall segments (213, 227) are provided, on which the driving block (225) on the winding portion (216) is supported on the outer peripheral side to both in Drehachsrichtung sides of the elevator belt (2), and wherein at least one lower of the Supporting wall segments (213) on removal of the inspection cover assembly (208) from the inspection opening from the winding section (16; 216) is removable, so that the driving block (225) can be inserted and removed through the inspection opening. Reel unit according to Claim 8, characterized in that the inspection cover arrangement (208; 208, 308) has a revision insert (208) which can be inserted into the inspection opening and which has a (221, 222) inspection cover fastened to both sides of the axis of rotation, preferably clipped on the edge of the inspection opening and two thereof Drehachsnormal upwardly projecting, a lower part of the outer peripheral guide for the driving block (225) forming Stützwandsegemente (213) to both located in Drehachsrichtung sides of the lift belt outlet opening. A reel unit according to claim 8 or 9, characterized in that the elevator belt outlet opening is bounded on both sides parallel to the axis of rotation by an outlet wall (205, 206), the two outlet walls (205, 206) being formed on spring legs (235, 236) they bias each other, and wherein the two outlet walls (205, 206) preferably over the sides located in the rotational axis of the inspection opening, then on the housing (201) to both located in Drehachsrichtung sides of the inspection opening, an expanding mandrel (219) is provided, which when introduced in the inspection opening revision insert (208), the outlet walls (205, 206) apart spreads. A reel unit according to claim 8, 9 or 10, characterized in that the driving block (225) in a central portion in Drehachsrichtung at least one to the outer circumferential direction over the winding portion (216) of the reel (201) projecting Führungsungskufe (234), with which he the guide path formed by the wall segments (213, 227) located between the two sides of the elevator belt (2) located in the direction of rotation of the axis of rotation is guided axially with respect to the axis of rotation. An elevator blind reclaimer unit comprising a number of reel units as claimed in any one of claims 8 to 11, characterized in that the elevator hoop replacement unit comprises the elevator belt (2) attached to the driver block (225), the driver block (225) being suitable for loose reception in the hoistway Mitnehmerausnahme on the winding portion (216) of the reel (3), and also in the inspection opening of the reel unit insertable inspection insert (208) having the inspection cover and the two lower Stützwandsegemente (213) on both sides of the elevator belt (2), wherein the An elevator belt (2) is threaded through the elevator belt outlet opening enclosed by the two outlet walls (205, 206). Building opening shading device, in particular external venetian blind, with a winding shaft rotatably mounted on a head strip and a blind made of blinds, wherein on the winding shaft a number of attacking respectively at the bottom lamella and the other lamellae by cross-elevator belts (2) are fixed, and preferably also a double number of turning tapes which on the long sides attack at least the other slats, characterized in that for fastening the number elevator belts (2) and preferably twice the number of turning belts, a number of reel units according to one of claims 1 to 11 is provided, via which the curtain is attached to the winding shaft and on which the Winding shaft is rotatably mounted on the head strip, and / or each elevator belt is part of a elevator belt exchange unit according to claim 13. Building opening shading device, according to claim 13, characterized in that the head strip is formed as an approximately U-shaped profile, each reel unit is arranged with its bottom and / or marginal foot sections on the groove bottom of the U-profile standing and forming the groove bottom wall of the Head strip in the area of the inspection opening of the reel unit is broken.

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