DE2340870A1 - Venetian blind with top and bottom spindles - strips moved sideways by screw driven carriage - Google Patents

Abstract

The blind strips are moved sideways by means of a threaded shaft running through the carriage. The shaft has a nut with internal thread corresponding to that of the shaft. A drive spindle has a pinion attached to it connected to a second pinion on a second shaft. The drive spindle has a nut with cogging round the outside and an internal thread corresponding to that of the drive spindle. The axial movement of the nut is limited by two stop pieces. The nut is connected to a third pinion. The drive spindle has a coupling on one end which grips into holes in a sprocket wheel, pivot mounted on the pivot pin of a wall bearing. The sprocket wheel can be turned in both directions by a pulley chain which turns the drive spindle.

Description

DR. ING. KARL BOEHMRRT . DIFL-INU. AL3ERT BOEHMERT

28 BREMEN FELDSTRASSE 24 TEL. (0421) »74044

DR.-ING. WALTER HOORMANN - DIPL.-PHYS. DR. HEINZ GODDAR

File number: New registration (additional patent) p <»» «» «e * fconfo. Hamburg ΐ26οβ3

- ^ ' Bank account) Bremer Bank, Bremen, KIo. 1001449

Name d. Note: BAUiPEX Adolf St over KG

My reference: β 1128 A 28 Bremen, August 11, 1973

BAUTEX Adolf Stöver KG, 2850 Bremerhaven 27, Carsten-Börger-Strasse 2

Louvre blind with plumb, arranged, side slidable slats that can be pivoted about their longitudinal axis according to the patent. ... ... (Patent application P 16 59 557-6-25)

The invention relates to a slat blind with vertically arranged, laterally displaceable and jointly limited pivotable slats about their longitudinal axis, at the upper or upper and lower end of which a pivot axis is arranged in the center, which is rotatably suspended in a guide carriage slidably mounted in a support rail, the guide carriage are each penetrated by a screw thread having a sliding shaft and the displacement of the lamellae is effected by means of a screw nut having an internal thread corresponding to the screw thread, which is arranged in an opening of the guide shaft penetrated by the sliding shaft, according to patent. ... ... (Aktz;: P 16 59 557.6-25).

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In the patent (file: Ρ 16 59 557.6-25) is

already pointed out that a known generic Louvre blinds, as described in US Pat. No. 3,054,446, have the disadvantage that that to the side Yerschieben the slats on the one hand and to "pivot the slats around their respective longitudinal axis on the other hand separate drawbars as. Drive organs are provided. The main disadvantage of such a training is that the two pulling devices selbsL are constantly confused by people who operate such a blind frequently, with the one pulling device is held for the other and therefore instead of pivoting the slats a move is made or vice versa. Such a mix-up puts a strain on the venetian blind but unnecessarily. Moreover, it has been shown that after repeated confusion of the drawbars the actually applicable drawbar apparently due to an occurrence Annoyance is then jolted to such an extent that it becomes an in and of itself avoidable damage to the blind. Another disadvantage of the known venetian blind lies in the inevitably required relatively large effort, which is caused by the numerous components and, last but not least, their assembly. This also reduces the operational safety, what, with such objects and predominantly used by laypeople the resulting often inadequate treatment rightly as extremely undesirable is felt. Another disadvantage of the

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known venetian blind is that the pivoting movement of the slats is limited by them by the lamellar blades touching each other and thus preventing further pivoting. However, this leads very easily, especially when the pulling device is actuated too strongly damage to the slats.

The patent (file number: P 16 59 557.6-25)

is therefore based on the task of the known slatted blind with respect to the drive improve that the slats are both moved and pivoted with a single drive can, whereby the limitation of the pivoting movement should be done as possible in a way that damage which practically excludes lamellae.

The present invention shows a further proposal for solving this problem, the consists in the fact that in a generic louvre blind, in which in a known manner the Guide carriages are also penetrated by a pivot shaft having longitudinal grooves and the swiveling of each lamella, the over-rotation of which is to be prevented by a slip clutch one arranged in the respective guide carriage, on the one hand with the pivot shaft and on the other hand with the axis of rotation of the lamella cooperating gear takes place, according to the invention a drive spindle is provided on which a first pinion is attached, which is in engagement with a second pinion arranged on the pivot shaft; and that on the drive spindle one with a

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External toothing provided, rotatable and axially movable nut provided between two stops which is in engagement with a third pinion arranged on the sliding shaft.

The louvre blind according to the invention provides it therefore to get along with only a single drive with which the slats both pivoted and can be proceeded. Because first of all, the drive spindle goes through the first pinion and the second pinion only sets the pivot shaft in rotation, while the displacement shaft despite the constant engagement of the nut arranged on the drive spindle with the third pinion does not is driven. This results from the fact that the acting on the shift shaft Resistance forces are considerably greater than those from the frictional force alone between the drive spindle on the one hand and the one in engagement with it standing internal thread of the nut on the other hand existing resistance force, so that the displacement shaft despite the spinning mother and despite the mother's constant engagement with the third The pinion stands still until the nut has reached one or the other of the two stops. First at this point the resistance forces acting on the mother exceed those on the displacement shaft attacking resistance forces due to the form fit between the mother and the relevant Stop considerably, so that there is a rotation of the sliding shaft. Keep the first and the second pinion is constantly in torque-transmitting engagement. This is harmless because the swivel

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"Movement of the slats limited by stops can be, and because when these stops are reached, over-rotation of a lamella by the slip clutch is prevented.

The drive spindle can in a preferred embodiment of the invention at its one end portion with a Sprocket be connected, which by means of a chain or a similar drive, for example a cable drive to be set in rotation.

It has proven to be particularly advantageous if at least one of the two stops on the Drive spindle is arranged, with one such Stop can have a provided with a stop surface approach that in the stop division of the Mother cooperates with a stop surface of an approach provided on the mother. In preferred Embodiment of the invention, however, both stops are designed in such a way, with the nut then on each of its two end faces should be provided with a shoulder having a stop surface can.

In a further embodiment of the invention it is provided that the mutual distance between the two stops is designed to be adjustable. This has proven to be particularly useful for initial assembly proven. Adjustment is usually no longer required.

The invention and preferred embodiments of the invention are shown below in an embodiment

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example further explained with reference to a drawing. It shows:

Fig. 1 is a perspective exploded view of the drive part of the louvre blind and

2 shows a perspective illustration of the drive spindle with the two stops, the mother and the first pinion.

Figure 1 shows an exploded view of the drive part of a venetian blind with vertically arranged, laterally displaceable and limited jointly pivotable about their longitudinal axis slats, on their A pivot axis is arranged in the middle at the upper end, which axis is slidably mounted in a support rail Guide carriage is rotatably suspended. The slats, their axes of rotation, the support rail and the Guide carriages are not shown in the drawing, since this is an arrangement that

from the patent (file number: P 16 59 557.6-25)

is well known.

Just like the one in the patent. ... ... (file: P 16 59 557 * 6-25) described slat blinds In the exemplary embodiment, too, the guide carriages each have a screw thread Shift shaft 1 penetrated. The slats are moved by means of a the internal thread corresponding to the screw thread of the displacement shaft 1, likewise not shown threaded nut, which is penetrated by the displacement shaft 1 in a breakthrough

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chuhg of the guide carriage is arranged.

The carriages also have longitudinal grooves 2 having pivot shaft 3 penetrated, as this for example from DT-OS 2 036 is known. Accordingly, the pivoting of each slat also takes place here via an in the respective one Guide carriage arranged, on the one hand with the pivot shaft 3 and on the other hand with the axis of rotation the lamella cooperating, also not shown gear, whereby an over-rotation " the lamella is to be prevented by a slip clutch.

In addition to the shafts 1 and 3 already described, a drive spindle 4- is provided on which a first pinion 6 is non-rotatably attached. The first pinion 6 stands with one on the pivot shaft 3 non-rotatably arranged second pinion 7 in engagement.

On the drive spindle 4- a nut 9 provided with external teeth 8 is also arranged. The nut 9 has a thread of the drive spindle. 4 corresponding internal thread 11 and is accordingly rotatable on the drive spindle 4 and therefore axially movable. The axial movement the nut 9 is limited by two stops 12 and 13, which are described in more detail below and can be seen in particular in FIG. The nut 9 stands with one on the sliding shaft 1 non-rotatably arranged third pinion 14 · in engagement.

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The first pinion 6 is arranged on one end section 16 of the drive spindle 4 and is held in a rotationally fixed manner by a pin 17 in the assembly position. The second pinion 7 is ^{non-rotatably arranged on the} end section 18 of the pivot shaft 3 and is held there with a pin 19. In a corresponding manner, the third pinion 14 is also arranged on the end section 21 of the displacement shaft 1 and fastened there in a rotationally fixed manner with a pin 22. It can be seen that the end section 21 of the displacement shaft 1 protrudes beyond the end section 18 of the pivot shaft 3, so that the two pinions 7 and 14 are not aligned with one another but are offset from one another.

The drive spindle 4 carries on its one End section 16 facing away from the other end section a coupling 23 »which in the assembled state in Recesses 24 of a chain wheel 26 engages which on a bearing pin 27 of a wall bearing 28 is rotatably held. The chain wheel 26 is optionally in both directions of rotation with a pull chain 29 to put in rotation, whereby the drive spindle 4 is to be rotated.

As can be seen from Figure 2, the one stop 12 for the nut 9 is through a stop surface 31 of an attachment 32 on the coupling 23 educated. The stop surface 31 acts with a correspondingly designed stop surface 33 of Mother 9 together. In a corresponding manner, there is also one on the other end face of the nut 9 Stop surface 34 for a stop surface 36

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seen, which cooperates in an analogous manner with the nut 9 or its stop surface JA- .

The operation of the drive part of the louvre blinds described above is as follows:

If the drive spindle 4 is set in rotation by a tensile force exerted on the chain 29, the drive spindle 4 drives the second pinion 7 via the first pinion 6 and thus sets the pivot shaft 3 in rotation. In this case, the slats are therefore initially pivoted without a displacement already occurring, as is desired for the operation of a slat blind. At the same time, the nut 9 moves from one of the two stops 12 or 13 in the direction of the other stop 13 or 12 _? without the displacement shaft 1 rotating despite the constant engagement of the external toothing 8 of the nut 9 with the third pinion 14, since the resistance forces acting on the displacement shaft 1 are very large in relation to the resistance forces acting on the nut 9. Only when the stop 13 or 12 is reached do the resistance forces acting on the nut 9 exceed the resistance forces acting on the displacement shaft 1 due to the positive locking occurring in the stop position, so that torque is transmitted, with the displacement shaft 1 being set in rotation and the already pivoted slats moves. A pulling carriage 37 is set in motion, which moves the guide carriage out of the pushed together starting position.

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If the slats are to be swiveled in an intermediate position without further shifting, so this is easily possible by reverse pulling movement in every shift position, since the nut 9 then immediately releases from the respective stop and moves in the direction of the other Stop axially in settlement, without it in turn to a torque transmission to the Shift shaft 1 is coming.

.The particular advantage of the slat blinds according to the invention is therefore not only due to the fact that an extremely simple and inexpensive solution has been found which can both be moved and swiveled with a single drive, but also in the fact that pivoting can optionally take place in each intermediate position without at the same time there is a shifting movement, as is very often desired. Of considerable Another advantage is that the pivoting movement is not limited by the slats themselves takes place, so that corresponding damage to the slats is practically impossible.

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Claims (1)

Expectations 1. ^ Slat blinds with vertically arranged, laterally displaceable and jointly limited pivotable about their longitudinal axis -lamellae, on their upper or upper and lower end .mittig an axis of rotation is arranged, which in one in one Support rail slidably mounted carriage is rotatably suspended, the carriage each be penetrated by a screw thread having a displacement shaft and the displacement of the Lamellae by means of a threaded nut having an internal thread corresponding to the screw thread is effected, which is arranged in an opening penetrated by the sliding shaft of the guide carriage, according to the patent (Aktz .: P 16 59 557.6-25), characterized in that, in a known manner, the carriage also by a pivoting shaft having longitudinal grooves (2) (3) to be penetrated and the pivoting of each lamella, its overturning by a slip clutch is to be prevented, on the one hand, via an arranged in the respective guide carriage the pivot shaft (3) and on the other hand with the Axis of rotation of the lamella cooperating gear takes place, with a drive spindle (4-) provided is on which a first pinion (6) is attached, 509811/0032 which is arranged with a on the pivot shaft (3) second pinion (7) is in engagement; and that on the drive spindle (4) one with a External toothing (8) provided, rotatable and axially movable nut (9) between two stops (12, 13) is provided with a third pinion (14) arranged on the displacement shaft (1) in the Engagement is. 2. Slat blind according to claim 1, characterized in that that the drive spindle (4) is connected at one end portion to a chain wheel (26) is, which is to be set in rotation by means of a chain (29). 3. Slat blind according to one or both of the preceding claims, characterized in that at least one of the two stops (12, 13) is arranged on the drive spindle (4). 4. Slat blind according to claim 3 »characterized in that that a stop (12 or 13) is provided with a stop surface (31 or 36) approach (e.g. 32), which in the stop position of the nut (9) with a stop surface (33 or 34) an approach provided on the mother (9) cooperates. 5 » Slat blind according to one or both of the preceding claims, characterized in that the nut (9) is provided on each of its two end faces with a shoulder having a stop surface (33 or 34). 509811/0032 6. Slat blind according to one or more of the preceding claims, characterized in that that the mutual distance between the two stops (12, 13) is adjustable. 7. Slat blind according to one or more of the preceding claims, characterized in that that the first pinion (6) is arranged on an end section (16) of the drive spindle (4), 8. Slat blinds according to one or more of the. preceding claims, characterized in that that the second pinion (7) is arranged on an end section (18) of the pivot shaft (3). 9. Slat blind according to one or more of the preceding claims, characterized in that that the third pinion (14) is arranged at an end portion (21) of the displacement mechanism (1). 10. Slat blind according to one or more of the preceding claims, characterized in that that the second pinion (7) and the third pinion are arranged offset from one another.