DE2335657A1 - ELECTRICALLY DRIVEN BLIND - Google Patents

Description

Applicant: Stuttgart, June 18, 1973

Dipl.-Ing. Hans Groß P 2738 K / kg 7 Stuttgart-Feuerbach
Fahrionstrasse 47

Electrically powered blind

The invention relates to an electrically driven blind, roller shutter or the like. with a drive motor, one armature axially displaceable against the action of a brake spring and one brake with at least one with the armature shaft rotating braking surface, which when the engine is switched off by the action of the brake spring is pressed against a non-rotatable braking counter-surface

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The electrically driven one known from Σ ^ Ι-PS 1 103 282 Roller shutter dieξor type has a drive motor with a cone-shaped sliding anchor, the Arikerv / elle connected to it at one end a cone-shaped braking surface firmly connected to it carries through when the engine is switched off the effect of a 3remsfeder arranged at the other end of the armature against a conically shaped Brerns mating surface is pressed, whereby the fuel spring, which is supported at one end against the end face of the armature, at its other end is supported by a ball bearing in the housing.

The drive device of this known roller shutter has the disadvantage that the drive motor has a relatively large diameter because of the conical formation of the armature and the conical formation of the inner surface of the stator, so that this known drive device is not suitable for installation in the narrow head strip of a blind , -, the width of which is usually not greater than 50 ^ ¹³ -. A scaling down of the drive motor with conical sliding armature to this size would also be disproportionately high because of the increased demands on the accuracy of the individual parts. Lead to manufacturing costs.

There is a further disadvantage of this known roller shutter in that the conical or conical braking surfaces increase the overall length because of their axial extension and require a relatively large switching path. However, since the distance between the Laiaellenende and the first

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Winding device "with a blind a" certain This dimension cannot be exceeded, which must also be adhered to by the overall length of the drive motor • Construction for motors in 50 mia wide headers a blind are to be used, is very difficult to achieve. A level training of the braking surfaces this known arrangement, which would lead to a shorter overall length, is opposed to the consideration that this should lead to smaller braking surfaces with increased wear · Multi-disc brakes with a larger surface again require a switching path that is much too large for these conditions. In addition, the operational safety a multi-disc brake when the engine is only allowed to have the small dimensions mentioned and for proportionately small moments is made, not very high.

The object of the invention is to provide a drive motor for blinds, shutters or the like. to develop its length and width are as small as possible which nevertheless develops a braking force that meets the special conditions of this Sufficient application area, namely the roller shutter or the like. Able to brake and hold in any position.

This object is achieved according to the invention in that a flat brake facing away from each other Sides of the sliding anchor are arranged *.

An advantage of the invention is that flat braking surfaces are much faster with a much smaller one Switching travel with high operational reliability disengages as cone brakes or multi-disc brakes · Because two brakes are provided, it is no longer necessary to use cone brakes to increase the braking surface.

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see. Since the "two brakes are also on different Sides of the anchor are arranged, the Y / arms generated by them can easily be dissipated, so that you have a relatively small cross-velvet braking surface gets by.

The invention can be implemented in the most varied of ways. For example, on the stub axles be attached to both sides of the armature brake discs, which are caused by the brake spring Move the armature against braking surfaces fixed to the housing and move away from them when switching on of the current taking place shift against the action of the brake spring from these braking surfaces again, with the brake spring, as known per se, is supported on the one hand on the displaceable armature and on the other hand on the housing. In contrast, in one embodiment of the invention, there are not only one displaceable armature, but two displaceable ones Parts are provided between which the Brensfeder is clamped such that the brake spring with her one end against the armature and with its other end against a sliding part carrying a braking surface supported, which is guided displaceably in opposite directions to the armature movement. The particular advantage of the invention lies in that this construction leads to a very small volume. It is also beneficial to meet the masses, which are shifted when switching on and off the engine, to keep it as small as possible, so that the recoil on the housing becomes correspondingly small. In the present embodiment according to the invention, the recoil is on the case even practically zero, because the brake spring

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is not supported on the housing and when switching on the pulses of the two masses, i.e. the product mass times essentially cancel the speed of the armature on the one hand and the moving part on the other

Various constructions are possible in order to mechanically connect the moving part and the armature to one another to connect that they perform an opposite movement.

In one embodiment of the invention, the two Masses are not mechanically connected to each other, but by the magnetic field, whereby as with the im Above discussed embodiments of the invention, the anchor both the conical Porm known per se as can also have the usual cylindrical shape. In this embodiment, there is the braking surface bearing Part at least partially made of magnetizable The material and the driving force for its movement in the opposite direction to the armature is due to the action generated by the magnetic field, which penetrates the armature and stator of the motor. It is already known for an engine to provide an electrically operated brake with an axially immovable armature, in this known arrangement However, an electromagnet is provided which is independent of the magnetic field of the motor and which is activated when the motor is switched on Motor holds a braking surface against the action of a brake spring at a distance from its braking counter surface (Make Hüppe). In contrast, in the present embodiment of the invention for releasing the brake Magnetic field is used, which generates the rotary movement of the motor and for this purpose penetrates the stator and armature, whereby this

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Magnetic field on its return operates the magnetic brake. In principle, it does not matter at which point of the return of the magnetic field the movable, magnetizable "part is located by its movement the brakes are released if it is only ensured that this part is in the direction of the magnetic field lines is movably guided or so that this part in an inhomogeneous magnetic field in a denser area of the Magnetic field can be drawn in. For example, this moving part can be in the immediate vicinity of the armature or a, over be arranged in the immediate vicinity of the stator at the point where the essential Part of the magnetic field re-enter the stator. In this last-mentioned embodiment of the invention it may be useful, contrary to the aforementioned embodiment of the invention, the two moving parts, namely, the anchor and the part carrying the braking surface, not at the endaa facing away from one another of one and the same braking spring to be arranged, but it may be useful to arrange two brake springs in this case, if necessary appears that. to let the brake spring acting on the armature circulate with it, the one on the movable, a braking surface Brake spring acting on the load-bearing part, however, must not be allowed to rotate. Accordingly, the Movement of the part carrying the braking surface required, the size of which is variable due to the movement be provided either on the side of the part carrying the braking surface at which the magnetic field enters this part or on the side on which the I.Iafcnetfeld from this Part exits again. For example, there can be a diose air gap

v /.

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when executing ^ forms of the invention -immediately to the The end face of the armature can then be provided. Considerations can also be applied to these constructions as they are known from the construction of üelais, especially with regard to the size of the air gap, the gluing of the mutually movable parts, the Arrangement of an adhesive sheet and the like. Their application, however, because of the completely different problems in the Engine construction is neither known nor obvious.

The mechanical structure of the drive motor according to the invention can be implemented in various ways. The rope, which is displaceable in the opposite direction to the armature movement and carries a braking surface, can in embodiments the invention be slidably guided on the armature shaft, which results in a particularly simple construction, because the brake spring can rotate with the armature shaft and thus a unilateral rotatable mounting of the Brake spring is dispensable. This would be necessary if the brake spring on the one hand against the armature and on the other hand is supported against a non-rotatable braking element.

The displaceable guide of the brake part on the armature shaft can be realized in the YJeise that in one embodiment of the invention the displaceable ^r ^ eil is guided on the circumference of the armature shaft in an axially parallel teeth. However, other embodiments are also possible, for example one in which the end section of the armature shaft is designed as a hollow shaft in which the brake spring is arranged. The outer

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The end of the brake spring is supported on a bolt which is guided in a longitudinal slot of the hollow shaft and on which the axially displaceable, with the armature circumferential brake surface is attached.

The embodiment in which the braking surface supporting Part is guided displaceably but non-rotatably on the armature shaft, is expediently further developed to the effect that that the part carrying the braking surface has an annular groove concentrically around the armature shaft, in which the brake spring designed as a spiral spring is held, with coupling elements for transmitting the Rotational movement of the armature shaft are provided on the displaceable part. The one arranged outside the armature shaft Brake spring is inexpensive to manufacture due to its larger diameter and can be easily set to the specified braking force,

The coupling elements can be formed in that on the end face of the armature at a distance from the armature shaft and bolts extending in the axial direction are provided which engage in axially parallel bores of the displaceable part.

In the case of a Y / pus formation in this embodiment, the armature has a metallic ring on the sliding side facing the braking surface, which can be made of cast aluminum, for example. After switching off the current, this ring represents an electrical short circuit for the induction currents.

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In one embodiment of the invention this is
A particularly simple and expedient embodiment results from the fact that the bolts forming the coupling elements are formed by the cast shoulders of this metal ring arranged on the end face of the armature.

This ring has in one embodiment of the invention on its outer circumference a guide surface on which the displaceable part in addition to its guidance the armature shaft is guided. This the face of the

Anchor enables directly adjacent guide surface a very precise guidance of the movable part, so

that the working gap of the magnetic field to drive the

"Displacement movement of the moving part is very small

can be. For example, the displacement is

of the movable part a maximum of 2/10 mm. Here can

the brake spring have a spring force of about 1 to 2 kp.

Heavy-duty plastic brake pads are suitable as brake pads. Since the two brakes are arranged on sides of the armature facing away from one another and are therefore relatively far apart, depending on the type of brake lining, stronger heating can also occur in
Buy it because the heat can be dissipated quickly and cannot contribute to the mutual heating of both brakes. It has also been found to be useful to attach the brake pads to the stationary ones
However, not to arrange braking surfaces on the circumferential braking surfaces in order to avoid that with uneven

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Wear and tear of the brake pads these get an imbalance, which manifests itself in an uneven running of the engine.

Instead of a displaceable armature, the motor can also have an armature mounted in an axially immovable manner. The motor then has one on each side of the armature Brake on, which is not actuated by a movement of the armature, but by others, for example known means. In this embodiment of the invention, too, it is of great advantage if the required Braking force is applied by two spatially separated brakes as far as possible so that the Heat generated during braking is dissipated well, which is in addition to the heat generated when the engine is running is produced. For good heat dissipation, it is also beneficial if the end shields of the motor are made of aluminum exist.

can in one embodiment of the invention both Brakes can be actuated by the magnetic field of the motor. This has the advantage that it is on both sides of the anchor existing stray field is used to tension the brake springs in an optimal way. This embodiment the invention can be used both in the case of an axially immovable armature and in the case of an axially displaceable armature be realized. In the case of an axially displaceable armature, when the motor is switched on, the armature and it are positioned facing brake halves, which are supported by the brake springs on the armature, in a shift position, - in the the magnetic field flows through them the strongest.

Further features of the invention emerge from the following description of an embodiment of the invention based on the drawing. The individual features can be implemented individually or in groups in embodiments of the invention,

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Fig «1 shows an embodiment of the invention in a longitudinal section of the drive motor.

Fig. 2 shows a detail of Fig. 2 on a larger scale.

FIG. 3 shows a detail corresponding to FIG on a larger scale "in another embodiment of the invention.

The drive motor Ί shown in Figs. Λ and 2 has a housing, the middle section of which by the stator 2 and its front, output-side housing part 3 and its rear housing part 4 arranged at the other end of the stator 2 as cup-shaped castings made of magnetic or non-magnetic Material are formed, which are each held in an annular fold 5 of the stator 2 with Klemiasitz. The front housing part 3 and the rear housing part 4- have concentric bores 6 and 7, in which a YJelle 8 of an armature 9i, which is glued to them, is slidably mounted with a sliding fit. The stator 2 and the armature 9 are cylindrical.

A double brake is provided in the motor, one brake in the front housing part 3 and another Brake in the rear housing part 4- are arranged. The in

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The brake arranged in the front housing part 3 opens a brake disk 10 which is fastened to the armature shaft 8 with the aid of a short sleeve 12 and the end face of which forms the one braking surface. The other braking surface facing it is formed by the end face of a flange 11, which is covered with a brake lining 22 and which is arranged on a bushing 13 fixed to the housing in the bearing bushing 6, in which a bearing bushing, which exists as a sliding bearing for the anchor shaft 8, is fastened can for example consist of Teflon. In the rear housing part 4, the armature shaft 8 is mounted in a plastic bush 29 held in the bearing bore 7. For this purpose ± st _f a plastic selected can be largely dispensed wherein a lubrication of the bearing surfaces ·

The brake arranged in the rear housing part 4 has an axially displaceable, made of magnetizable, preferably ferromagnetic material Part 17, which has a braking surface 15 on its end face facing away from the armature 9. The rope 17 is slidably guided on the armature shaft 8 with a sliding fit and has a cylindrical circumference, the diameter of which is approximately equal to the diameter of the armature 9. In the end face facing the anchor a recess 30 is cut out, in the bottom of which individual, even deeper into the rope 17, running parallel to the axis of the armature shaft of the motor Bores 21 are provided. This annular groove 30 runs at a distance from the circumference so that between the groove

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and the periphery of part 17 has an annular end face 25 is present, which forms a limitation of the variable air gap in the magnetic circuit, its other surface is formed by the end face of the armature 9. When the engine is switched off, this is Air gap about 2/10 mm. When the motor is switched on, the surface 25 rests against the end face of the armature 9. By Grinding of the surface 25, the size of the air gap can be adjusted, in particular so that even with from the armature 9 attracted movable part 17 still a small air gap between the surfaces 25 and the The end face of the armature 9 is made. The ring face is only about 2 mm wide at its end on the anchor side.

The outer flank of the groove 30 is on the outer, one Guide surface 26 for the movable part 17 forming The outer surface of a cast aluminum ring 27 arranged on the end face of the armature 9. The outer The outer surface of the aluminum ring 27, namely the guide surface 26, has the after removal of the mold Shape of a conical section and is used to form the guide surface 26 pretty much to the extent of the Inside diameter of the. annular surface 25 turned off. The axial extent of this guide surface 26 need only be slightly larger than the length of the displacement path of the displaceable ^ part 17, which is about 1 / 1O to 2/10 mm and the greatest possible distance between the braking surface 15 and a stationary one covered with a brake lining Brake counter surface 16 corresponds. In the present case, however, the axial extent of this guide surface is 26 ten times the displacement. the

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Guide surface 26 does not extend over the full Height of the aluminum ring 27, so that on its outer, the end facing away from the anchor 9 remains an inclined phase 28, which facilitates the assembly of the ropes. These Guide surface 26 gives part 17 a guide which, in addition to the displaceable guide of this part is effective on the armature shaft 8.

To transmit the rotational movement of the armature 9 to the displaceable part 17, the aluminum ring 27 has one or more bolts 20 running parallel to the axis of the armature shaft 9, for which the casting attachments formed in the feed channels of the casting mold are used and which engage in the holes 21 already mentioned. These bolts serve only for the transmission of the rotational movement of the armature on the displaceable ² eil 17, but not as an additional guide elements ·

The displaceable part 17 has a further concentric to the armature shaft extending annular groove 18 in which a spiral spring 19 serving as a brake spring is arranged, over which the sliding part 17 moves against him facing end face of the armature 9 is supported. The spiral spring, which is constantly under compressive stress force exerted by the magnetic attraction force exerted on the 2eil 17 when the motor is switched on must be overcome is of the order of 1 kp. Such strong brake springs are only possible because the air gap between the movable part 17 uncL the anchor 9 because of the small "displacement of ίί / ΪΟ up to 2/10 mm only a low magnetic resistance

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and allows high magnetic forces. The magnetic field generated when the drive motor is switched on pulls 6. & B out of a ferromagnetic one !!! Llaterial existing displaceable part 17 against the end face of the armature, the physical conditions being comparable to those of a hinged armature relay. The substantially in the axial direction from the end face 33 of the armature 9 exiting magnetic field occurs to a substantial! Part on the variable air gap by the area 25 in the existing part of a ferromagnetic material 17th From there, the magnetic field closes, if the housing part 4 is made of magnetic material, via the unchangeable air gap 32 via the housing part 4 and the stator 2. If the housing part 4 is made of non-magnetic material, the magnetic flux emerges from the armature 9 facing away End face of part 17 and closes over the air to the stator. The conductivity of the magnetic circuit is lower in this case, but the principle of the motion drive for the movable part 17 does not change, in particular because the winding pots 31 and the magnetizability of the material of the part 17 also in this case ensure sufficient bundling of the Cause magnetic field

When the engine is turned on, the armature becomes 9 pulled into the stator in the manner known from sliding armature motors and thereby the front brake lobe 10, ventilated. At the same time, the magnetic field generated in the motor pulls the part against the tension of the spring 19 against the end face 33 of the armature 9 »so that the rear brake 15 * 16 is released. In both cases it is

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the plastic "existing brake lining 22" resp. 25th arranged on the stationary braking surfaces 11 "and 16, respectively.

When the engine is switched off, this is done by the pulp spring the displaceable part 17 against the brake lining 23 of the braking surface 16 and at the same time the armature 8, 9 against the braking surface 10 of the front brake is pressed. The force of the spring 19 is distributed over both brakes evenly.

In a further embodiment of the invention can the shaft 8 be axially immovable and the brake, as shown in Fig. 2, can be in the same Way be additionally formed on the other side of the armature, so that there also one through the magnetic field applied brake is available.

This magnetically operated brake can also have a simpler design, namely as it is shown in section in FIG. 3 is shown. In this embodiment, the brake plate 10 slidably guided on the shaft 8. A compression spring 33, one end of which is supported against the armature 9, endeavors to press the plate 10 against the brake lining 22 of the stationary brake half. When the Motor is the part 10 by the magnetic field of the motor against the action of the brake spring 33 in one Distance from the brake pad 22 kept.

^T .7ie already mentioned, kann'die invention, both also be used in connection with cone armature motors than in connection with cylindrical anchors. The design with cylindrical armatures has the advantage that the i-otor can be made very small.

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Claims (14)

- 17 patent claims l.y Electrically powered blinds, shutters, awnings od. The like. With a drive motor which has a braking surface which is axially displaceable against the action of a spring has, in particular an armature axially displaceable against the action of a brake spring and a brake having at least one braking surface that rotates with the armature shaft and that when the drive motor is switched off is pressed against a non-rotatably arranged counter-braking surface, characterized in that ge a flat brake (10, 11 or 15, 16) arranged on opposite sides of the armature (9) is. 2. Apparatus according to claim 1 with an axially displaceable armature, characterized in that the with their one end against the armature (9) bracing brake spring (19) with its other end against a braking surface (15) supporting part (17) is supported, which is guided displaceably in opposite directions to the armature movement. 3. Electrically driven blinds, shutters, awnings or the like with a drive motor that counteracts the action a spring having axially displaceable braking surface, in particular according to claim 1 or 2, characterized in that that the part (17) carrying the braking surface (15) consists at least partially of magnetizable material and that the driving force for its movement against the action of a brake spring (19) is due to the action of the magnetic field is generated, which penetrates the armature (9) and the stator (2) of the motor. 409885/0222 4 ·. Device according to claim 3, characterized in that that on "both sides of an axially non-displaceably mounted shaft (8) axially displaceably guided braking surfaces (15, 10) are provided. 5- device according to claim 3 or 4-, characterized in that that the magnetically conductive material of the braking surface (15) carrying part it (17) of the end face (33) of the armature ©) is arranged adjacent. 6. Device according to one of claims 3 "to 5» thereby characterized in that the through the movement of the part (17) variable air gap in the magnetic circuit to the The end face (33) of the armature (9) is then arranged. 7. Device according to one of the preceding claims, characterized in that the bearing the braking surface Part (17) is slidably guided on the armature shaft (8). 8. Apparatus according to claim 7 »characterized in that the displaceable part (17) on the circumference of the Armature shaft (8) is guided. 9 · Device according to claim 7 »characterized in that that the armature shaft (8) has a section designed as a hollow shaft in which the brake spring is arranged is, and that the displaceable part (17) has a radially penetrating through the elongated hole of the armature shaft Has pin against which the brake spring is supported. 409885/0222 10. Device according to one of the preceding claims, characterized in that the displaceable part (17) has an annular groove (18) which runs concentrically to the armature shaft (8) and in which the spiral spring is formed Brake spring (19) is held, with coupling elements (20, 21) for transmitting the rotary movement the armature shaft are provided on the displaceable part. 11. The device according to claim 10, characterized in that that the coupling elements are arranged at a distance from the armature shaft (8), perpendicular to the end face of the armature (9) protruding bolts (20) are formed, which in axial bores (21) of the sliding Engage part (17). 12. Device according to one of the preceding claims, characterized in that the anchor is an anchor- axis at a distance encompassing, running in a plane perpendicular to the armature axis, acting as a short-circuit ring, preferably made of non-magnetic material metal ring (27). 13. The device according to claim H, characterized in that the bolts (20) through the gmass lugs one on the End face (33) of the armature (9) arranged metal ring (27) are formed. 14. The device according to claim 11, characterized in that the Hing (27) has on its outer circumference a I ¹ clocking surface (26) on which the displaceable part (17) is guided. 409885/0222 Blank page