EP0219454A1 - Device for rolling up, unrolling and automatically braking a sun blind or a weather-protecting device - Google Patents

Abstract

The drive shaft (I) of the device, driven by means of a crank mechanism (2) or electric drive (44), is guided through two equiaxial tubular coupling parts (II, II'). A helical spring (12, 12') is drawn onto each coupling part. Each helical spring has a first turn part (19, 19') and a second turn part (20, 20') which has a larger diameter than the first turn part. Attached to turn-free portions of the second turn parts is a worm (3) which is in permanent engagement with an output wheel (4) and into which the angled end parts (18, 18') of the turn parts (20, 20') engage non-positively. The limit stops (21, 21') each consist of three gearwheels (23, 23', 25, 25', 26, 26'), the first gear wheels (23, 23') being in engagement with the angled end parts (17, 17') of the first turn parts (19, 19'). By blocking the gear wheels, the helical springs are uncoiled and thus brought out of engagement with the coupling parts. The driving shaft rotates without any torque transmission. To bring the first gear wheels out of engagement with the angled end parts, there is a stop-adjusting mechanism (16, 16'). In this device, no mechanical stop limitations are needed, and the components of the sun blind or weather-protecting device are protected against overloading and consequently damage by an interruption of the torque transmission in the limit-stop positions or any other positions. <IMAGE>

Description

The invention relates to a device for rolling up and down and for automatically braking the curtain of a sun and weather protection system, with a drive shaft which can be actuated via a crank drive or an electric motor, a gearbox with a worm which is in engagement with a driven wheel, and two brake drums, as well as an output shaft that can be actuated via a driver fixed in the driven gear.

In the previously known devices of the type mentioned above, only a fixed stop was known, which was mostly used to limit the turning down of the curtain. A mechanical limitation had to be installed for the upper stop. In addition, the interruption of the torque when moving to the stop was not known, which resulted in excessive stress on the components, such as the crank drive, transmission, etc. Due to the lack of torque interruption, these components could be severely damaged.

The invention specified in claim l was based on the object of eliminating the known mechanical limit stops by a device by which the components of the sun and weather protection system when reaching the lower and the upper stop position of the curtain, but also in any intermediate position, from overstraining and damage would be protected if necessary. The assembly times of such a device should be shortened compared to the prior art. Furthermore, with such a device the deblocking and readjustment of the stop positions of the curtain should be carried out during the assembly of the curtain in a very simple, time-saving manner. Finally, in the case of such a device, the drive shaft of which is electrically driven, the automatic shutdown of the electric drive should also be enabled when the transmission-side torque interruption is triggered.

This object is achieved in the device according to the preamble of patent claim 1 by the features of the characterizing part of patent claim 1.

• Fig. l, einen Längsschnitt des Getriebes einer er­findungsgemässen Vorrichtung mit einer über einen Kur­belantrieb oder einen Elektromotor betätigbaren Antriebs­welle,
• Fig. 2, einen Schnitt entlang der Linie II-II der Figur l,
• Fig. 3, einen Schnitt entlang der Linie III-III der Figur l,
• Fig. 4, eine Draufsicht auf drei ineinander grei­fende Zahnräder der Endanschläge gemäss der Figur l, im grösseren Masstab und teilweise im Schnitt,
• Fig. 5, eine perspektivische und gesprengte An­sicht des in der Figur l dargestellten linken Kupplungs­teiles mit Abtriebsrad,
• Fig. 6, eine Ansicht der Vorrichtung nach der Figur l mit eingekuppeltem Elektromotor und von mit ihm in Wirkverbindung stehenden Mitteln,
• Fig. 7, einen Schnitt entlang der Linie VII-VII der Figur 6 und
• Fig. 8, eine vereinfachte Darstellung der auf das Abtriebsrad nach der Figur l wirkenden Kräfte und Aus­lenkrichtung des Abtriebsrades.

The subject matter of the invention is explained in more detail below with reference to the drawing, for example. Show it:

• 1 shows a longitudinal section of the transmission of a device according to the invention with a drive shaft which can be actuated via a crank drive or an electric motor,
• 2, a section along the line II-II of Figure l,
• 3, a section along the line III-III of Figure l,
• 4, a plan view of three intermeshing gear wheels of the end stops according to FIG. 1, on a larger scale and partly in section,
• 5, a perspective and exploded view of the left coupling part shown in FIG. 1 with driven gear,
• 6 shows a view of the device according to FIG. 1 with the electric motor engaged and means operatively connected to it,
• Fig. 7, a section along the line VII-VII of Figure 6 and
• 8, a simplified representation of the forces acting on the driven wheel according to FIG. 1 and the direction of deflection of the driven wheel.

The device for rolling up and down and for automatically braking the curtain, not shown A sun and weather protection system comprises a drive shaft 1, a transmission 7 (see FIG. 1) and an output shaft, not shown. The drive shaft 1 is set in rotation by a schematically illustrated crank drive 2 or an electric motor 33. The drive shaft l is carried out by two tubular coupling parts ll, ll ', which are accommodated in the transmission housing 5 in an abutting and coaxial manner. The ends of the coupling parts ll, ll 'are stored in bearing shells 5l, 5l'. The drive shaft l is longitudinally displaceable in the coupling parts ll, ll 'and is positively mounted on the circumference at an angle of approximately 45 °. The worm is supported by the coupling parts ll, ll '. The worm 3 is in constant engagement with an output gear 4, in which a driver 10 is fastened for actuating the output shaft, not shown.

A flat coil spring l2, l2 ', which has a special shape, is mounted on each coupling part ll, ll'. The one, outwardly directed coil part l9, l9 'of each coil spring l2, l2' has a smaller diameter than the other, inwardly directed coil part 20, 20 '. The inside diameter of the one winding part l9, l9 'is also smaller than the outside diameter of the coupling part ll, ll'. The angled end part of the one winding part l9, l9 'is denoted by l7, l7'. The other winding part 20, 20 'merges into a winding-free section which has an angled end part 18, 18'. Due to the slightly smaller inner diameter of the outward winding part l9, l9 'compared to the outer diameter of the coupling part ll, ll', this winding part of the coil spring is firmly attached to the coupling part ll, ll 'with a certain pretension.

A fixed brake drum l3, l3 'is placed on each inward winding part 20, 20' puts. The brake drums l3, l3 'are held immovably in the transmission housing 5 by brake drum holding wedges l4, l4'. The inner diameter of each brake drum l3, l3 'is smaller than the outer diameter of the inward winding part 20, 20' of the coil springs l2, l2 '. The braking effect is achieved by the other winding part 20, 20 'resting on the inner wall of the brake drum l3, l3'. The worm 3 is placed between the two brake drums l3, l3 'on the winding-free sections of the coil springs l2, l2'. Insert blades 9 are provided between the screw 3 and the brake drums l3, l3 '. Each angled end part l8, l8 'of the coil-free sections of the coil springs l2, l2' engages in a wedge path 8 formed on both sides of the worm 3 in a force-locking manner.

A bore 32 with an oval outer contour is provided in the housing 5, in which the driven wheel 4 with the driver 10 is mounted so as to be radially displaceable with play (see FIG. 2). The stub shafts 28 of the driven wheel 4 are supported in bearing shells 30, 30 'which are prestressed by spring assemblies 3l, 3l'. These spring assemblies 3l, 3l 'consist of one or more spring plates. In the figure, three slats are shown in the left half and only one in the right half. The three slats in the left half are for raising, whereas the one in the right half is for lowering the curtain. The preload force of the bearing shells 30, 30 'can be changed in stages by the spring plates 3l, 3l'. If the selected spring force of the spring plates 3l, 3l 'is exceeded for any reason, the driven wheel 4 shifts radially from its center by about 1 mm. The reasons for exceeding the spring force can include, for example, frozen end rails of the curtain, latched latches, an object lying in the area of the curtain on the window sill etc.

In the gear housing 5 two adjustable end stops 2l, 2l 'are housed, which are in engagement with the coil springs l2, l2'. Each end stop 2l, 2l 'consists of a set of three intermeshing gears 23, 23', 25, 25 ', 26, 26' (see FIGS. 4 and 5), which can be freely selected within the adjustment range of approx. 220 revolutions jam automatically. The gears have unequal diameters. The three gears are each housed in a pair of guide blades 22, 22 'which are resilient. The first, largest gear 23, 23 'of the set has internal teeth 24, 24'. The angled end part l7, l7 'of the outward winding part l9, l9' of the coil springs l2, l2 'engages in this internal toothing.

The three gears are designed to form a locking device. On these gearwheels - at locations designated by small circles in FIG. 4 - one tooth gap is smaller and one tooth larger than the other gaps or teeth. Thus, each set of three gears 23, 23 ', 25, 25' and 26, 26 'contains four gear errors, one on the first 23, 23' and the third gear 26, 26 'and two on the smallest idler gear 25, 25 'are attached. Within the adjustment range of a maximum of approximately two hundred and twenty crank revolutions, the number of crank revolutions is freely adjustable and the gears 23, 23 ', 25, 25', 26, 26 'caused by the toothing errors can be jammed. With 27, 27 'bearing bolts are shown, by means of which the intermediate gears 25, 25' and the third gears 26, 26 'in the pairs of guide blades 22, 22' and the corresponding recesses of the gear housing 5 are held be.

The gear housing 5 further comprises a stop adjustment mechanism 16, 16 ′. As can be seen from FIG. 1, a stop adjustment mechanism is provided in each half of the device. Each stop adjustment mechanism comprises an axially movable pressure ring 50, 50 ', a stationary bearing bush 5l, 5l' and a steel cable 53, 53 '(see also FIG. 3). The pressure ring 50, 50 'and the bearing bush 5l, 5l' each contain a toothing 52, 52 'on the end face. Both parts have an edge break on the outer circumference of the teeth 52, 52 ', so that a conical groove 54, 54' is formed all around when the teeth 52, 52 'engage. The steel cable 53, 53 'is passed through the walls of the gear housing 5 in a bore so that it lies in the groove 54, 54' and wraps around the two parts. The two ends of the wire rope 53, 53 'emerge from the housing 5.

If the drive shaft l is rotated to the right, the helical spring l2 drawn on the coupling part ll contracts and winds the other winding part 20 located in the brake drum l3, which is of a larger diameter than the first winding part l9, so that the helical spring l2 opens stretched their entire length and thus sits non-positively on the smooth surface of the coupling part ll and takes the screw 3 by means of the winding-free section with the angled end part l8. As the other winding part 20 becomes narrower, this winding part is released from the brake drum l3. The opposite helical spring l2 'is entrained by the end part l8' located in the worm 3 without a turn. Here, too, the other winding part 20 ', which is of a larger diameter than the first winding part l9', is drawn together in the brake drum l3 'and only runs with one ge wrestle with friction.

If the end stop 2l blocks in the one end stop position of the curtain due to the coincidence of the four toothing errors on the three gear wheels 23, 25 and 26, the angled end part l7 of the coil spring l2, which engages in the internal toothing 24 of the first gear wheel 23, is now suddenly stopped . The wrap angle of the coil spring l2 on the coupling part ll becomes slightly smaller, so that the coil spring l2 on the coupling part ll is partially unscrewed, which enables the coupling part ll to continue to rotate freely in the coil spring l2 and the torque can no longer be transmitted. A further turning to the right on the drive shaft l takes place without torque transmission, so that no damage or destruction of the components of the system is possible.

However, the device can also function in any position of the curtain except for the lower and upper end stop positions. This is done by the radial displacement of the driven wheel 4 in the oval bore 32 by exceeding the maximum permissible torque. Depending on the rotational movement of the drive shaft 1, the driven wheel 4 presses on the inner guide blade of one of the pairs 22, 22 'by its displacement. Due to the increased friction now occurring between the lower gear wheels 25, 25 'or 26, 26' and the inner guide blade of the pair 22, 22 ', an increasing force acts on the angled end part l7, l7' of the coil spring l2, l2 ', because the wheels 23, 23 ', 25, 25', 26, 26 'no longer turn. The result of this is that the outward turn part l9, l9 'of the helical spring l2, l2' is unscrewed, so that no torque transmission can take place between the drive shaft l and the worm 3.

The set stop position can be unblocked by pulling on the steel cable 53, 53 'of the stop adjustment mechanism l6, l6' and readjusted again. By pulling on the steel cable 53, 53 ', the loop around the pressure ring 50, 50' and the bearing bush 5l, 5l 'shrinks and the steel cable penetrates into the conical groove 54, 54'. As a result, the pressure ring 50, 50 'is set into an axial movement in the direction of the outer guide blade 22, 22' of the end stops 2l, 2l '. As a result of this movement, the first gear 23, 23 'is also slightly axially displaced, as a result of which the angled end part 17, 17' comes out of the internal toothing 24, 24 'of the first gear 23, 23'. As a result, the angled end part l7, l7 'is no longer in engagement with the internal toothing 24, 24'. The desired new stop position is then set, and the steel cable 53, 53 'is then relieved. As a result, the gear 23, 23 'is pushed back by the pairs of guide blades 22, 22' and the pressure ring 50, 50 'by a wave washer 55, 55'. The angled end part l7, l7 'of the helical spring l2, l2' engages in the closest gap in the internal toothing 24, 24 'of the first gear 23, 23' and prevents further rotation beyond the set stop position.

If the rotational movement of the drive shaft l to the right is stopped, the coil spring l2 relaxes and thereby rotates the coupling part 11 together with the drive shaft l somewhat. This means that the two coupling parts ll, ll 'move slightly against each other, for which the 45 ° rotary movement of the drive shaft l is required. The two coil springs l2, l2 'are now in the rest position, which means that they clamp with their other winding parts 20, 20' in the brake drums l3 l3 '. If the weight of the curtain now wants to turn back the driven wheel 4 automatically, the Snail 3 briefly rotated. This rotary movement is stopped immediately in both directions, because the worm 3 pushes back the coil springs l2, l2 'depending on the direction of rotation. The corresponding coil spring is then tensioned in the brake drum l3, l3 'and does not allow the worm 3 to turn further.

Turning the drive shaft 1 to the left produces analogous processes on parts of the transmission 7, which parts are labeled '. 6 with holes for screws, not shown, through which screws the two halves of the gear housing 5 are connected.

An electric motor 33 is accommodated in a housing 44 according to FIGS. 1 and 6. With the square shaft 4l of the electric motor 33, the rotary movement generated by the electric motor is transmitted to the drive shaft 1 and the worm 3. A cam disk 34, which has only a single cam 40, is placed on the square shaft 4l between the electric motor 33 and the worm 3. A ratchet wheel 35 is placed on an axis 43 in the housing 44, the cam 40 of the cam disk 34 engaging into one of the gaps between the teeth 45 of the ratchet wheel 35 when the electric motor 33 rotates. Thus, the switching wheel 35 is rotated by one tooth 45 per handling of the cam disk 34. Disc springs 39 are used to brake the switching wheel 35 during the rotary movement and to lock it in its rest position until it is rotated again by the cam disk 34. Perpendicular to the wheel plane 35 pins 38 are provided on both sides of the ratchet wheel, which are arranged radially on each side. They are intermittently set against each other on each side of the ratchet wheel 35.

In the housing 44, a two-armed actuating lever 36 is also provided, the lever from the housing 44 in Arm projecting in the direction of the driven wheel 4, which arm is provided with a tooth 46 at its end, is in engagement with the toothing 47 of the driven wheel 4. The actuating lever 36 is fixed in the housing 44 so that it can pivot about a point (fixing screw 48). The end of the other arm of the operating lever 36 is formed by a fork 49. The fork 49 surrounds the ratchet 35.

The actuating lever 36 is rocked by the rotational movement of the driven wheel 4. The result of these rocking movements is that the pins 38 of the switching wheel 35 do not abut the fork 49 of the actuating lever 36; the fork 49 swings away from the pins 38. Thus, the fork 49 is not laterally deflected and the limit switches 37, 37 ', which are also accommodated in the housing 44, are not actuated. The circuit to the electric motor 33 remains closed.

If one of the stops is approached or if the rail is overloaded in any position, the torque transmission is interrupted. The worm 3 and the driven wheel 4 stand still. As a result, the actuating lever 36 no longer performs any rocking movements. The pins 38 of the switching wheel 35, which still rotates periodically - because the cam disk 34 continues the rotary movement generated by the electric motor 33 - can no longer pass through the stationary fork 49 of the actuating lever 36. As a result, a pin 38 of the switching wheel 35 laterally deflects the fork 49 of the actuating lever 36 until, depending on the direction of rotation of the drive shaft 1, it actuates one of the limit switches 37, 37 '. The circuit to the electric motor 33 is thereby interrupted. 42, 42 'are styli on the limit switches 37, 37'.

The forces acting on the driven wheel 4 are indicated in FIG. Depending on the direction of rotation of the drive shaft l it does not occur (among others here forces) to form components Fx, Fy or Fx ', Fy'. The component Fx or Fx '- if it is large enough in terms of amount - causes a radial displacement of the driven wheel 4 in the direction x or x'. This lateral displacement is made possible because the driven wheel 4 is mounted in the oval bore 32 in a radially movable manner in bearing shells 30, 30 'preloaded with spring assemblies 3l, 3l'.

After a predetermined number of crank revolutions or due to various obstacles in the area of the curtain, the end stops 2l, 2l 'are blocked, as a result of which the transmission of the torque is interrupted and no damage to the components of the sun or weather protection system can take place. In order to prevent the case in which after a load in both directions of rotation both coil springs l2, l2 'would be too tight to open for the braking function, the coupling is carried out in two parts, so that the coupling parts ll, ll 'can turn on the drive shaft l by about 90 ° to each other. In the case of an electrically driven device, the electric motor 33 switches off automatically when the driven wheel 4 is stationary.

Claims (10)

1.Device for rolling up and down and for automatically braking the curtain of a sun and weather protection system, with a drive shaft (l) which can be actuated via a crank drive (2) or an electric motor (33), a transmission (7) with a worm (3 ), which is in engagement with an output gear (4), and two brake drums (l3, l3 ') and an output shaft that can be actuated via a driver (l0) fastened in the output gear (4), characterized in that the gear (7) has two axles Coupling parts (ll, ll '), one of which, depending on the direction of rotation of the drive shaft (l) penetrating the coupling parts, transmits the torque to the worm (3) via a flat coil spring (l2, l2') mounted on it, two with the coil springs (l2, l2 ') engaging adjustable end stops (2l, 2l') with gear wheels (23, 23 ', 25, 25', 26, 26 '), an oval bore (32) in which the driven wheel (4) stored by means of spring-loaded shells (30, 30 ') and radially vers can be pushed, whereby by clamping the gear wheels (23, 23 ', 25, 25', 26, 26 ') of each end stop (2l, 2l') or by pressing the driven wheel (4) against one of the end stops (2l, 2l ' ) the turns of the coil springs (l2, l2 ') on one of the coupling parts (ll, ll') are accomplished in order to enable the drive shaft (l) to rotate without torque transmission, and includes a stop adjustment mechanism (l6), and that the Electric motor (33) with means for interrupting the circuit when the drive shaft (l) continues to rotate without torque transmission. 2. Device according to claim 1, characterized in that each helical spring (l2, l2 ') has an outwardly directed (l9, l9') and an inwardly directed turn part (20, 20 '), the outwardly directed turn part ( l9, l9 ') of a smaller diameter than the inward winding part (20, 20') and the outer diameter of the coupling part (ll, ll ') that each brake drum (l3, l3') on the inward winding part (20 , 20 ') and has a smaller inner diameter than the diameter of the inward winding part (20, 20'), and that the worm (3) between the two brake drums (l3, l3 ') on winding-free sections with angled end parts ( l8, l8 '), into which sections the inward winding parts (20, 20') of the coil springs (l2, l2 ') pass. 3. Device according to claim 1, characterized in that each end stop (2l, 2l ') from a set of three intermeshing gearwheels (23, 23', 25, 25 ', 26, 26') which can be clamped after a predetermined number of crank revolutions large diameter, which are accommodated in a pair of resilient guide blades (22, 22 '), the first, largest gear (23, 23') of the set having an angled end part (l7, l7 ') of the outwardly directed winding part ( l9, l9 ') is engaged. 4. Device according to claim 2, characterized in that each angled end part (l8, l8 ') of the coil-free section of the coil springs (l2, l2') engages in a wedge-shaped path (8) formed on both sides of the screw (3) in a force-locking manner. 5. The device according to claim 3, characterized in that each angled end part (l7, l7 ') of the outward winding part (l9, l9') in the internal toothing (24, 24 ') of the first gear (23, 23') of the set engages non-positively. 6. Device according to claims 1 and 3, characterized in that the gears (23, 23 ', 25, 25', 26, 26 ') of each set have four toothing errors, each of which on the first (23, 23') and the third gear (26, 26 ') and two on the idler gear (25, 25'). 7. Device according to claims 1 and 6, characterized in that the jamming of the gears (23, 23 ', 25, 25', 26, 26 ') of each set takes place after a maximum of about two hundred and twenty crank turns. 8. The device according to claim l, characterized in that the two coupling parts (ll, ll ') on the drive shaft (l) can be rotated by about 90 ° to each other. 9. The device according to claim 1, characterized in that the stop adjusting mechanism (l6) has an axially movable pressure ring (50), a fixed bearing bush (5l), the pressure ring and the bearing bushing each having a toothing (52, 52 ') on the end face, and comprises a steel cable (53) which runs through the walls of the gear housing (5) parallel to the axis of the driver (10), lies in a conical groove (54) formed by the pressure ring (50) and the bearing bush (5l) and the pressure ring and wraps around the bearing bush. l0. Device according to claim 1, characterized in that the means with which the electric motor (33) is connected, a cam disc (34) with a single cam (40), which is placed on a square shaft (4l) of the electric motor (33) , A ratchet wheel (35) with radially and mutually perpendicular to the wheel plane on one side and the other side intermittently arranged pins (38), the cam disk (34) rotating the switching wheel (35) around a tooth (45), a pivotable, two-armed actuating lever (36) and two limit switches (37, 37 ') comprise, the one, with a tooth (l6) provided arm of the actuating lever (36) with the toothing (47) of the driven wheel (4) in engagement and can be set into rocking movements when the driven wheel (4) rotates and the other end of the the other arm has the form of a fork (49) surrounding the ratchet wheel (35), which can be pivoted away from the pins (38) when the driven wheel (4) rotates, so that the circuit remains closed, and when the driven wheel (4) is at a standstill can be laterally deflected by one of the pins (38) of the switching wheel (35), which is still rotating periodically, in order to actuate one of the limit switches (37, 37 ') to interrupt the circuit, depending on the direction of rotation of the drive shaft (1).

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