DE3441790A1 - DRIVING DEVICE FOR A WINDOW REGULATOR - Google Patents

Description

Applicant:. G 54763

NIPPON CABLE SYSTEM INC.
Sakae-machi 1-chome, Takarazuka-shi, Hyogo-ken, Japan

Drive device for a window regulator description

The invention relates to a drive device which is used in a window lifter and hereinafter referred to briefly as a drive device is referred to, in particular, the invention relates to a drive device that automatically which can eliminate the loosening or constant stretching of wires and which is able to maintain the tension of the wires keep in a suitable area.

So far, window regulators have been made with flexible wires as Power transmission means are used in doors by Vehicles or the like used. For example, a window regulator according to FIG. 24 is known. The window regulator has two wires 81 and 82 that go into the window regulator are inserted in a tensioned state; a drive device 84 is provided with a drum 83 to the Wind wires 81 and 82 in opposite directions, with one end of each wire connected to the drum connected is; a driven device 87 is provided with a carrier plate 86 which is on a guide rail 85 is slidable and which is connected to the other end of the wires 81 and 82, respectively. When the Trom mel 83 is rotated in the direction of arrow A or B one of the wires 81, 82 wrapped around the drum 83 while

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the other wire from the drum. 83 is settled; Consequently the carrier plate 86 moves in the direction of arrow C or D.

However, elastic stretching and permanent stretching generally occur in the wires, for example stranded ones Metal wires, in the course of operation. If there is permanent stretching and / or loosening in the wires, the tension of the wires is lost, and it is impossible for the driving device 84 to operate correctly transmitted to the driven device 87.

The play, the loosening or the permanent stretching of the Wires have the following disadvantages: For example, a window pane wobbles due to the vibrations a motor vehicle or the like in the vertical direction; a crank arm wobbles due to the vibration of a vehicle or the like; the window pane is stained, as greased wires come into contact with the window pane; moreover, whipping sound of wires due to vibration of a vehicle or the like in caused the doors. These disadvantages affect a driver, for example. Also have loose wires the tendency to become detached from a guide member or a pulley for guiding wires, with the danger there is damage. The window regulator therefore occasionally fails.

So far, various means have been proposed to eliminate the looseness or constant stretching of wires, to properly regulate the tension of the wires.

For example, a tension regulating mechanism for extending the length of the wire path is known using a spring that is associated with an outer housing or a conduit that can slide a wire against an Pushes part of the outer casing at one end of the

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outer housing is assigned, or by means of a tension pulley. In addition, a different mechanism is specified in IT-PS 927 030 corresponding to GB-PS 1 382 330, which can eliminate the looseness or play of wires by using a pawl plate relatively to the drum rotates manually. The ratchet plate is arranged adjacent to a wire winding drum, the ratchet * has teeth and engages one end of a wire stands.

As with the mechanism described above, however, there is a problem that it is somewhat difficult to set up to operate, as the wire is always tight. There are several problems with the latter mechanism because it is practically impossible to regulate the tension of the wires after the mechanism inside the Door of a vehicle or the like is installed.

In order to overcome the above disadvantages, mechanisms for automatically eliminating permanent stretching are given generated in the wires, for example in U.S. Patent 4,400,993 and U.S. Patent 4,440,354.

_. The mechanism essentially comprises two separate trons, i.e. a first drum and a second drum] with ratchet teeth or ratchet teeth 93 and 94 on each opposite side, as with the dash-dotted lines Lines indicated in Fig. 24. The mechanism can eliminate the permanent elongation by using a relative Rotation of the first drum 83a to the second drum 83b takes place. However, the mechanism has no function Balance between the force to raise the window pane and the force to lower the window pane; further the mechanism has no function of reducing the force to lower the window pane, since no spiral spring is used. The mechanism is, in spite of it of the coil spring, the size of the coil spring by the size that is, the diameter and the depth of the in the second

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outer housing is assigned, or by means of a tension pulley. In addition, in IT-PS 927 030, corresponding to GB-PS 1 382 330, another mechanism is specified which can eliminate the loosening or play of wires by manually rotating a ratchet plate relative to the drum. The pawl plate is disposed adjacent a wire take-up drum that has pawl teeth and engages one end of a wire.

As with the mechanism described above, however, there is the problem that it is somewhat difficult to operate the device because the wire is always under great tension. The latter mechanism has some problems in that it is practically impossible to regulate the tension of the wires after the mechanism is installed in the interior of the door of a vehicle or the like.

In order to overcome the above disadvantages, mechanisms for automatically eliminating permanent stretching are given generated in the wires, for example in U.S. Patent 4,400,993 and U.S. Patent 4,440,354.

The mechanism essentially comprises two separate drums, that is, a first drum and a second drum with ratchet teeth or ratchet teeth 93 and 94 on each opposite side, as indicated by the dash-dotted lines in FIG. The mechanism can do the Eliminate permanent stretching by causing relative rotation of the first drum 83a to the second drum 83b he follows. However, the mechanism has no function of balancing the force to lift the window glass and the force to lower the window pane; further, "the mechanism has no function of reducing the force to lower the window pane, since no spiral spring is used. The mechanism is, in spite of it of the coil spring, the size of the coil spring by the size, that is, the diameter and depth of the in the second

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■ j switching teeth and the '/. Wide switching teeth in the direction of rotation slide along each other and move both rows of teeth in the axial direction opposite to each other, eventually the ratchet teeth come back into engagement. In addition, the concept of "idle motion" includes not just one case / where one of the ratchet teeth move in the axial direction and rotate around the axis, .but also various other cases, for example the case where one of the ratchet teeth is in the axial direction

IQ tion move and the other ratchet teeth rotate around the axis rotate, or the case where both groups of ratchet teeth move in the axial direction to move towards each other remove, and the case where one or both sets of ratchet teeth are in opposite directions around the axis Rotate directions.

On the other hand, if the coil spring is designed to support the weight of the window glass or the force to raise the window pane is balanced with the force to lower the window pane, the compressive force is to compensate not sufficient, since the size of the coil spring is limited by the size of the cavity that is in the conventional second pulley is incorporated. In this. It is desirable that the compressive force of the The spiral spring is enlarged as much as possible. In particular, it is desirable that the diameter in the state of Insertion of the spiral spring is as large as possible in order to make the overall thickness of the mechanism thinner or smaller.

However, it is desirable to reduce the operating force of the crank arm by increasing the ratio of the length of the crank arm increased to the diameter of the second pulley, that is, by reducing the diameter the pulley. In order to meet the opposite requirements at the same time, it is conceivable to use the spiral spring take out of the cavity of the second pulley and accommodate it in another part. In this However, the problem arises that the total thickness

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the drive device increases.

In the case where the mechanisms described above with ratchet teeth are used in the drive device, however, excessive elastic stretching occasionally occurs. For example, if the sliding resistance is between of the carrier plate 86 and the guide rail 85 temporarily "rises, or when the crank arm 91 in the direction of the arrow B is rotated after the first wire 81 is completely wound, that is, after the support plate 86 has reached the stopper 88, the relative rotation of the first drum 83a and the second drum 83b becomes excessive Way done. As a result, elastic expansion occurs in the first wire 81 and the second wire

82. As a result, the engagement of the shift teeth 9, 3 and 94 can proceed further in a state to appropriate Eliminate game. It is disadvantageous that such excessive elastic stretching of the wires is permanent Causes elongation and causes the pulley 89 and the axes of rotation of the other connecting parts to bend and that the operation of the crank arm 91 is difficult.

In addition, in the case where the crank arm 91 is rotated in the direction of arrow A, the one circumstance causes the above-mentioned sliding resistance increases, or the other circumstance that the crank arm is rotated in the direction of arrow A. is after the carrier plate 86 has reached the opposite stop 90 that the ratchet teeth or ratchet teeth 93 and 94 slip on each other, despite the direction of combing of the two groups of ratchet teeth. This . Effect is hereinafter also referred to as "slip effect". The slipping effect causes the wires to become loose. By abrasion or wear and tear of the head heights of the jaw teeth 93 and 94 there is a tendency that this Slipping effect occurs.

A mechanism to eliminate the constant stretch or Loosening wires with a brake spring, for example

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"U-344 179C of a brake spring 114 in FIG. 25, which extends between the to drive shaft 95 and the drum 8 3 is known. The brake spring 114 shown in FIG. 25 is used to prevent a window glass, for example window glass 100 in Fig. 24, from being raised or lowered except that the crank arm 113 or the shaft 112 are actually rotated. With such a: -Drive device will be the actuations of the brake spring; 114 in the manner described below by the Zuori tion of a notch or recess area 118 of a train * neten part 117 and an associated projection 119 di Drum 108 realized with a certain play, for example an angle of 30 ° in the direction of rotation. In the case, where drum 108 is not attached to shaft 112, the associated part 117 is attached to the shaft 112.

As shown in Fig. 25, when the crank arm 113 in Is rotated in the direction of arrow A, a side surface 118a of the notch portion 118 pushes a pin 114a of the Brake spring 114 in the direction of arrow A. Accordingly, the locking engagement of the brake spring due to de; Frictional resistance of the brake spring and an inner peripheral surface of the housing released because the diameter of the brake spring 114 is reduced. Since accordingly the Dre Hung of the associated part 117 ensures that the guy area 118 and the associated projection 119 are assigned to one another the drum 108 can be rotated in the direction of arrow A.

A rotation of the crank arm 113 in the direction of arrow 1 also ensures that the locking engagement of the brake spring is unlocked. Even if someone tries to di < To raise or lower the window pane 100 according to FIG. 24 without turning the crank arm 113, the brake spring di ( Locking action by, as the diameter of the brake spring 114 increases, and the associated projection 119 of the Drum 108 presses against pin 114a or 114b of the Brake spring 114.

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With regard to the locking effect or the unlocking effect it is necessary in the manner described above, that one pen moves to some extent before the other pen moves so that the The diameter of the brake spring increases or decreases. For this purpose it is necessary to have some play between associated protrusion 119 and notch area 118 in FIG .To have direction of rotation. If there is no play between them, both tabs or pins 114a and 114b rotated at the same time / and the diameter of the brake spring 114 can neither increase nor decrease. Accordingly, can no locking operation or unlocking operation take place.

Correspondingly, the shaft 112 is in the area of play rotatable with respect to the housing 111 without the drum 108 to turn yourself. In this case the crank arm 113, which is attached to the end of the shaft .112, also pivotable through an angle of the order of about 30 ° or rotatable. Thus, when the window regulator is installed in a vehicle or the like, it results in a Problem that the crank arm 113 wobbles due to the vibration of a vehicle or the like or a noise evokes. This problem causes discomfort to a driver, for example.

In addition, the crank arm wobbles or wobbles 113 result in the pins 114a, 114b of the brake spring having to repeatedly absorb impulse forces. Another problem consists in that the repeated impulse forces at the lugs or pins 114a, 114b cause fatigue or damage. Thus, the operation the window regulator cannot be carried out.

One way of solving the above problems is conceivable by reducing the frictional resistance of the shaft 112 and the 'housing:'. 111 or the Roilmncjiiwirleri :! and dor shaft 112 and drum 108 increased, but it .lot schwLei: .isi »

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the frictional resistance within a suitable range and it does not make sense to increase the frictional resistance, as this would make the actuation force too great and also wear out the sliding areas.

The object of the invention is therefore to provide a drive device for a window regulator that is more effective Way prevents the crank arm from wobbling or dangling.

Another object of the invention is to provide a drive device for a window regulator with which the The tension of the wires can always be maintained in a suitable range.

Furthermore, the invention aims to provide a mechanism to create a must that meets the opposing requirements, that is, the use of a spiral spring large diameter, increasing the ratio of the length of the crank arm to the diameter of the pulley hereinafter also referred to as the lever ratio, and reducing the thickness of the mechanism so that the function the tension regulation of the wires and the function of balancing the force to lift the window pane with de Force to lower the window pane without impairment.

According to the invention, a drive device for a window regulator is specified which has the following assemblies:

(a) a housing,

(b) a drum adapted for rotational movement in the housing and a first side surface having first Ratchet teeth, a second side surface with a first engagement part for engagement with a first wire end and a circumferential surface as a wire winding surface having,

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(c) a pawl plate coaxially contiguous with the drum and a surface having second ratchet teeth in engagement with the first ratchet teeth of the drum as well a second engagement part for engagement with a two. th wire end,

(d) a coil spring which has one end engaged with the pawl plate and the other end engaged with the housing is engaged and which pushes the ratchet plate in a "direction such that the first ratchet teeth and the second ratchet teeth move freely,

(e) an elastic member which presses the drum in the axial direction towards the ratchet plate, and

(f) a shaft for rotating the drum through engagement with the drum.

Furthermore, according to the invention, a drive device for a window regulator is specified which has the following assemblies:
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(a) a housing,

(b) a drive element, which has a shaft that is capable of rotary movement is designed within the housing and has an associated element secured to the shaft, wherein the associated element extends radially from the shaft and has at least one notch area has along a peripheral edge of the associated element,

(c) a drum housed in the housing, the associated element is adjacent, coaxial to the

Shaft is and is rotatable about the shaft, and has an associated projection, the associated Projection is arranged on a first side surface of the drum, which is opposite to the associated element- "35 lies, engaging the notch area with some play is possible in the direction of rotation, and

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'**' -ie- ' ■ "■ 34ΑΊ 7 9 (

(d) an elastic member which urges or presses the associated element in the direction of rotation, and between two by the engagement of one end of the elastic member with the drum and by the engagement of the anc Ren end of the elastic part with the drive part

Furthermore, according to the invention, a drive device for a window lifter is specified, which has the following components:
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(a) a housing,

(b) a drive member comprising a shaft adapted for rotational movement within the housing, and ei has associated part secured to the shaft, the associated part extending from the shaft in extends radial direction and at least one Kert area along a peripheral edge of the associated part les has,

(c) a drum provided within the housing, disposed adjacent to the associated part, coaxially mounted with the shaft, rotatable about the shaft, axially movable along the shaft and an associated one Has projection, wherein the associated projection is arranged on a first side surface of the drum is opposite to the associated part, zugeorc the notch area with some play in the direction of rotation Can be net, and has first ratchet teeth on a second side surface of the drum, which is the first The side face of the drum is opposite,

(d) a ratchet or pawl member, which is provided within the Geh ses in the vicinity of the drum, coaxial with the Shaft arranged around the shaft is rotatably mounted and second ratchet or ratchet teeth on a first Side surface of the ratchet or pawl part, the drum has opposite one another, the second freestyle teeth are able to mesh with the first ratchet teeth,

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(e) a coil spring which is arranged between the pawl member and the housing so that it the pawl member in pushes the direction of the freewheeling movement of the first ratchet teeth and the second ratchet teeth,

(f) an elastic member which is located between the drum and the associated member in such a way that it is the assigned part in the direction of rotation pushes, * (g) a first wire that has one end to the drum engages, and a second wire which has one end engaged with the pawl member, and (h) a first pressure projection and a second pressure projection, which are arranged on the two undersides of the associated projection, and between floor surfaces of the associated part or the first side surface of the drum can be used, so that a loosening and constant stretching can be eliminated, maintaining the tension of the wires in an appropriate range is because the slipping effect is prevented, so that a wobbling movement of the crank arm is reliably avoided will.

The invention is described below, also with regard to further features and advantages, with reference to the description of embodiments

examples and with reference to the enclosed Drawing explained in more detail. The drawing shows in:

Fig. 1 is a perspective view, partially with

Broken lines to explain an embodiment of the drive device according to the invention; 30th

FIG. 2 is an exploded perspective view of FIG

drive device according to the invention according to Figure 1;

3 shows a front view of a window regulator with the one according to the invention Drive device;

FIG. 4 shows a perspective illustration to explain another embodiment of a drum in FIG the drive device according to the invention;

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* '/ «? - 3U179C Fig. 5 a pcrupokL Iviacho pa r «t.o llung: uir K rl Mute rim another version of a Klinkenplat in the drive device according to the invention;

Fig. 6 is a side view, partially with breaks away another embodiment of the drive unit according to the invention;

7 shows a perspective illustration to explain a further embodiment of the invention

proper drive device;

8 shows a perspective exploded view of the embodiment of the drive device according to the invention according to FIG. 7;

9 to 14b are schematic representations to explain the operating states of the invention Drive device according to FIG. 7;

15 is an exploded perspective view

further embodiment of the drive device according to the invention;

16 shows a side view, partly with broken away, of a further embodiment of the invention Drive device;

17 and 18 front views of window regulators using the drive mechanism according to the invention.

tung;

19 shows a perspective illustration, partly with interruptions, to explain a further one Embodiment of the drive according to the invention

Facility;

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Fig. 20 is a partial front view of the invention Drive device according to FIG. 19;

21 shows a side view, partly with breaks, of the drive device according to the invention

Fig. 19;

"Fig. 22 is a partial front view for explaining a Operating state of the drive device according to FIG. 19;

23 is a side view, partly with breaks away, to explain an operating state of the drive device according to FIG. 19; 15th

24 is a perspective view of a conventional window regulator; and in

25 is an exploded perspective view of a conventional drive device.

In Figs. 1 and 2, numerals 1 and 2 denote a first housing or a second housing. A housing consists of the first housing 1 and the second housing 2. The Housing contains and supports a rotatable shaft 3. A drum 4 and a ratchet plate 5 are rotatable on the shaft mounted and attached adjacent to each other. The drum 4 is able to move in the axial direction on the shaft 3 to move.

A first side surface 6 of the drum 4 is provided with first ratchet teeth 7 provided. A second side surface 8, which represents an opposite surface to the first side surface 6, is provided with a first engagement part 10 with which a first wire end 9 is engaged. A first side face 1 1 of the ratchet plate 5, the drum 4 adjacent, is provided with second ratchet teeth 12, which with the first ratchet teeth 7 or a second engagement part 14,

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with which a second wire end 13 engages, can be brought into engagement.

On a second side surface 15 of the pawl plate 5 is a projection or projection 16 which. snut 17 is provided with a first engagement. In addition, an inner peripheral surface of the second housing 2 is provided with a second engagement groove 18.

A coil spring 19 is housed in the second housing 2. Both ends 20 and 21 of the coil spring 19 are shown in FIG the first engagement groove 17 and the second engagement groove 18 are inserted. The spiral spring 19 presses the pawl plate 5 in such a direction that an idling movement is generated, that is, in the direction of arrow A.

A cup-shaped associated part 22 is attached to the shaft 3, and a wing-like recess part or Notch part 23 is formed on the cylindrical side part of the associated part 22. The second side surface 8 is provided with an associated projection 24, which is capable of being connected to the wing-like recess part 23 can come into engagement with some play in the direction of rotation.

An elastic part, for example a helical spring 25, is located between the drum 4 and the associated one Part 22. The helical spring or helical spring 25 pushes the Drum 4 in the axial direction towards the ratchet plate 5.

One end 26 of the shaft 3 protrudes from a hole 27 of the first housing 1, and a crank arm 28 is at the end 26 attached to the shaft 3. A brake spring 29, which is of conventional type, is between an inner peripheral surface of the first housing 1 and an outer peripheral surface of the associated part 22 used, and both ends 3 0 and 31 of ^ brake spring 29 are in gaps between the wing-like Recess part 23 or the associated projection 24 used.

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A circumferential surface of the drum .4 is called the wire winding surface 36 used to wind a first wire 32 and a second wire 33. The first wire 32 and the second Wire 33 are wound in the same spiral direction, in the case of the arrangement according to FIG. 2 in a spiral direction a left-handed screw. The first wire end 9 of the first wire 32 is connected to the first engagement part 10 engaged. The first wire 32 is wound spirally to the side of the first side surface 6, goes on its way away from the drum 4 and is through a first guide groove 34 of the second housing 2 in a first outer jacket 35 out. The second wire end 13 of the second wire 33 is connected to the second engagement part the pawl plate 5 in engagement. The second wire 33 is around the winding surface 36 from the side of the first side surface 6 wrapped around to the side of the second side surface 8, goes on its way away from the drum 4 and is through a second guide groove 37 guided in a second outer casing 38. The respective other ends of the first Wire 32 and the second wire 33 are with a support plate 41 of a driven part 40 of a window regulator 39 engaged in the manner described below. Accordingly, the first wire 32 and 32 form the second wire 33 is essentially a closed loop.

"The mode of operation of the drive device according to the invention is explained in more detail below. In order to clearly describe the functions of the drive device, the drive device used in the window lifter 39 according to FIG. 3 is described as a typical case. However, the use of the drive device according to the invention is by no means restricted to this typical case. The mechanism can also be used in a wide variety of other devices in which wires are used as power transmission means.

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In Fig. 3, reference numeral 42 designates a drive part of the window regulator 39. The drive part 4 2 is driven with the Part 40 connected via two control cables 43 and 44. The drive device according to the invention is in the Drive part 4 2 included. The driven part 4 0 has a guide rail 4 5 and one that is slidable on the guide rail 45 mounted carrier plate 41. To change the direction of movement of the wires 32 and 33, a wire guide is provided or a pulley 46 is mounted on the upper end of the guide rail 45. In the same way is to change the direction of movement of the wire 32 a pulley or a wire guide 4 7 at the lower end of the guide rail 45 attached.

The control cable 43 includes a first wire 32 and a first outer jacket 35 for sliding the first wire 32, and in the same way the control cable 44 has a second wire 33 and a second outer jacket 38. That is, the control cables 43 and 44 are traction control cables.

When the window lifter 39 is rotated in the direction of arrow A as described above, the crank arm 28, the second wire 33 is wound around the drum 4 and the first wire 32 is unwound from the drum 4. Thus circulates the closed loop in the direction of arrow £, and a window pane attached to the support plate 41 G is raised. In the case where the crank arm 28 is rotated in the direction of arrow A, the drum 4 rotates μηα the pawl plate 5 together in the same direction, there the first ratchet teeth 7 and the second ratchet teeth 12 are firmly engaged with each other.

If the crank arm 28 is rotated further in the direction of the arrow B_, the first wire 32 is wrapped around the drum 4 wound and the second wire 33 unwound from the drum 4. Thus the closed loop circulates in Direction of arrow D, and the window pane G is lowered. Although the direction of arrow B is the direction

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the idle movement, in this case the Drum 4 and the pawl plate 5 together in the same direction, since the second wire 33, the pawl plate 5 to Turning pulls and since the coil spring 25 pushes the drum 4 in the direction of the ratchet plate 5 and causes the pawl plate 5 rotates in the direction of arrow B.

Since the length of the wound part of a wire around the drum 4 is equal to the length of the unwound part of the other wire is from the drum 4, regardless of the direction of rotation, one wire is on the Coiled area where the other wire is then unwound. The drive device according to the invention namely has only one winding surface instead of two winding surfaces for winding two wires. Thus can the thickness of the drum 4 can be made thinner. If accordingly, as will be explained in more detail below, a coil spring 19 having a large diameter in the state of being inserted and the drum being axially arranged in a row, the overall thickness of the mechanism can be made thinner will.

The following is the automatic elimination function the loosening of the wires 32 and 33 explained in more detail. In the case where there is loosening in the wires when the Drum 4 is rotated in the direction of arrow B by rotating the crank arm 28 in the direction of arrow B, the pulls second wire 33 does not move the pawl plate 5 in the direction of arrow B. In addition, the pawl plate 5 is located in a .Stand, where they continue from the compressive force of the coil spring in the direction of arrow A and through for example the frictional resistance between the pawl plate 5 and the shaft 3 is braked. Thus the drum 4 moves -35 which receives a torque in the direction of arrow B, towards the second side surface 8 in the axial direction against the compressive force of the helical spring 25. The first Klinkonzähne 7 slide or climb over the second

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* - ^ - 344 1 79C Klinkcjnzcihno 12, and nchl ielUioh come the harvest latch! teeth 7 and dio '/ wide KlinkonVahno 12 again mJ-teinande. engaged in the newly displaced position, namely by the compressive force of the helical spring 25. This is because an idling movement occurs. Accordingly, only the drum 4 rotates in the direction of arrow P, so that a relative rotation of drum 4 and ratchet plate 5 takes place. As a result, the looseness of the wires is eliminated. As soon as the tension of the wires has been regained, the pawl plate 5 and the drum 4 rotate together again.

In the drive device according to the invention, it is so that in the case where the compressive force of the spiral spring 19 stä ker than the force required so that ßich the first ratchet teeth 7 and the second ratchet teeth 12 in freewheeling can move (the force required also depends on the compressive force of the helical spring 25 and the angle of inclination of the respective teeth of the ratchet teeth 7 and 12), the spiral spring 19 drives the pawl plate 5 so that it actually rotates in the direction of arrow A, the spiral spring 19 of the pawl plate 5 at the same time gives the braking force.

Thus, the tension of the wires is regulated more precisely. In that case, the crank arm 28 can stand still.

If there is a loosening in the wires / the pawl plate 5, which is directed by the spiral spring 19 in the direction of arrow A is pressed, rotated in the direction of arrow A due to the freewheeling movement »As a result, the second wire end 13 pulled in the direction of arrow A, the second wire 33 is from the winding surface 36 of the drum 4 pulled away, and finally the first ratchet teeth 7 and the second ratchet teeth 12 come into engagement with each other by the action of the coil spring 25 in the position that the tension of the wires in proportion to the compressive force the helical spring 25 is. As accordingly the loosening

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of the wires is removed, the appropriate tension of the wire is achieved again. If only the latch plate 5 of the coil spring 19 is rotated, the drum 4 is opened by the pressing force of the brake spring 29 or by the frictional force braked between the drum 4 and the shaft 3.

In the event that the crank arm 28 is stopped, there is a tendency to maintain the looseness of the wires in the state where the drum 4 is sufficiently rotated in the direction of arrow B. This is based on the cause that the compressive force of the coil spring 19 increases in proportion to the amount of winding of the coil spring, and also is the amount of winding of the second wire 33 around the drum 4 in the above-described state is small.

In the case where the drive part 42 with the drive device according to the invention with the driven part 4 0 is connected so that the direction in which the spiral spring 19 presses the pawl plate 5 coincides with the direction in which the window pane 6 is raised, the spiral spring 19 functions as a conventional compensating spring.

Since the spiral spring 19 always presses the closed loop of the wires in the direction of the arrow C according to FIG. 3, the weight of the window pane G is balanced by the compressive force of the spiral spring 19. Thus, the operating force of the crank arm 28 has nothing to do with the directions of rotation of the Crank arm 28, and the operation becomes easy. In addition, the force for lifting the window glass G reduced. In the case where the window pane is lowered, the coil spring 19 is tightened. If on the other hand the window pane is raised, the spiral spring is released.

In the drive device according to the invention is located the coil spring 19 in a series state with the drum 4 and the pawl plate 5 without being housed in the drum 4 is. Thus, the leverage ratio can through

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Reduction of the diameter of the drum 4 can be increased. In addition, the function of balancing is good due to the Adaptation dor spiral spring 19, which is in the state of insertion has a large diameter. In addition, the thickness of the drum 4 can be made thin, that is, the total thickness the drive device can be made thin or small, since the drum 4 as a winding drum for both the first wire 32 and the second wire 33 serve.

Since the diameter of the spiral spring 19 is not limited by the diameter of the drum 4, the diameter of the coil spring 19 in the state of being inserted can be made larger than the diameter of the drum 4. Thus For example, a coil spring 19 with a strong pressing force can be used.

If in the case shown in Fig. 1 and 2, the housing consists of two divided housing areas, that is, the first housing 1 for receiving the drum 4 and the second housing 2 for receiving the spiral spring 19, it is easy to assemble the drive device. The latch plate 5 can be accommodated in the second housing 2. As FIG. 6 shows, the pawl plate 5 can be outside the dome be housed in the first housing 1. In the drive device according to FIGS. 1 and 2, the second is located Engagement part 14 outside the second ratchet teeth 12, but it is desirable to design the second engaging part 14 so that it is as close as possible to the center of rotation, the compressive force of the coil spring 19 in more effective Way to take advantage.

Referring to Figures 4-6, preferred embodiments are provided the drive device according to the invention explained in more detail. In the case of the drum 51 according to FIG. 4, it extends a part 52 of the winding surface, which is adjacent to the first side surface, to the inside of the first ratchet teeth 7. Even if the first ratchet teeth 7 are partially destroyed in this case, that is, if the first

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Ratchet teeth 7 do not form a complete annular group of ratchet teeth, the function of the first ratchet teeth can be maintained.

In Fig. 5, a pawl plate 53 is shown / the Drum 51 according to FIG. 4 is assigned. In this case, the second engagement part 54 is located inside the second ratchet teeth 12. If also / as FIG. 5 shows, a guide surface 55 as an extension area of the second Engagement part 44 is provided, the guide surface 55 lead a part adjacent to the wire end in an advantageous manner.

The mechanism shown in Fig. 6 is a drum 56 is provided with a concentric cylindrical groove 57. In addition, the drum 56 has one in the drawing Guide channel, not shown, which is designed in the same way as the part 52 shown in FIG. 4. A pawl plate 58 is provided with a cylindrical projection 59 which engages with the cylindrical groove 57 stands. The cylindrical protrusion 59 is provided with a second engaging part 60. An outer peripheral surface 61 of the cylindrical projection 59 is as a wire winding surface educated.

!

In the mechanism described above, a part of the wire on the outer peripheral surface 61 of the cylindrical VorSprunges 59 are wound continuously, due to the movement in which the drum 56 and the Pawl plate 58 rotate in opposite directions to each other. Accordingly, also in the case where the degree of loosening or constant stretching of the wires greatly increases, the mechanism in sufficient. Dimensions are applied.

In the embodiments described above, it is desirable that the wrap f] iichc? dor drum with a

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"'' 3AA1790 spiral-shaped winding groove is provided, for example the area which is denoted by the reference numeral 6 2 in FIG. 4, so that the wires are neatly wound up, without being devoured with each other.

If the drive device according to the invention second engagement part 14 is higher than the second pawl • teeth 12 in the axial direction, the second wire 33 preferably does not interfere with the ratchet teeth 7 and 12. Such preferred embodiment can be realized, for example, that the second engagement part 14 of the surface of the pawl plate 5 can protrude according to FIG. 2 or 5, or that the second engagement part 6 0 forms within the cylindrical projection 59, as shown in FIG. In this case that one is part of the Winding groove 62, which is closest to the first side part 6, as a circular groove instead of a spiral-shaped one Groove formed.

As mentioned above, according to the invention, a coil spring with a larger diameter and thus with a stronger Compressive force can be used; the leverage ratio can be increased; the thickness of the drive device can can be made small, and thus the function of regulating the tension of the wires and the function of balancing the force to raise a window pane is unaffected by the force to lower the window pane will be realized.

7 and 8 show an embodiment of the invention the drive device, which is constructed in a similar manner to the drive device according to FIGS. 1 and 2. Thus are the same parts as in Fig. 1 and 2 also with the denotes the same reference numerals; in this respect, a detailed description does not appear to be necessary. In Figs. 7 and 8 is a shell-shaped associated part 22 is attached to the shaft 3, and a wing-shaped recess part 23 is in the. cylindrical side part of the associated element 22

EPO COPY C

educated. A drive part consists of the shaft 3 and the associated element 22. The second side surface 8 the drum 4 is provided with an associated projection 24 which is able to mate with the recess part 23 of the associated element 22 with some play in the direction of rotation.

A helical spring 25 is located between the drum 4 and the associated element 22 as an elastic part. The helical spring 25 is provided with bent end parts 25a and 25b. One end part 25a engages with the associated element 22, and the other end part 25b engages with it the drum 4 in engagement. The helical spring 25 presses the drum 4, which can be moved along the shaft 3 in the axial direction is on the side of the pawl plate 5 and continues to push the drum 4 in the direction of arrow B, that is, in the direction of rotation of the idle movement. Both undersides of the associated projection 24 are provided with the first pressure projection 65 and a second pressure projection 66 (See Fig. 8).

The first pressure projection 65 is located on the side part, where the rotation of the associated part 22 in the combing

.- direction of the ratchet teeth 7 and 12 ensures that the recess part 23 pushes or pushes the associated projection 24. An upper part, denoted by the reference numeral 65a in FIG. 14a, of the first pressure projection is preferably tapered so that it is easy for the first pressure projection 65 to fit into a gap between the bottom surface 22a (see FIG. 12) of the associated part 22 and the second side surface 8 of the drum 4 to slide, that is, it is easy for the drum 4 to move in the axial direction towards the pawl plate 5. This facilitates the wire loosening removal process described below. When the "Aui""parun<jiil ν i 1 23 threatens itself due to the rotation of the crank handle 28 with the assigned projection 24, an axial force arises in the direction of the arrow Q, so

BATH

-35-

' ^J0 ' 3A41790

that a pressing force of the drum 4 to the ratchet plate 5
increases toward, and thereby the meshing engagement of the Klin · 7 and 12 is kenzähne even better ensured. Accordingly, the slipping effect is eliminated in an even more effective manner.

The second pressure part 66 is also preferably with a
small tapered area or a small round area 66a provided (see Fig. 14), so that the insertion or removal of the second DruckvorSprunges 66 in or from the gap between the bottom surface 22a and the second Be tenflache 8 takes place smoothly.

The shapes and the number of first pressing protrusions 6 5
and second pressing protrusions 66 are not limited. For example, as shown in FIG. 15, two first pressure projections and two second pressure projections can be arranged on a corresponding circular line. In this case, the associated part 22 can be provided with a recess part 23a, which is located on the opposite side
of the recess part 23 is located and .das is seen for a part which corresponds to the pressure projections 65 and 66. In general, it is sufficient to do a first
Provide pressure projection 65 and a second pressure projection 66 on the circular line.

There can also be a smaller number of assigned pre-inspections gene be mounted on the drum 4, and in this case the associated element is provided with recess parts the number of which corresponds to that of the assigned part

As shown in FIG. 8, one end 26 of the shaft 3 is inserted into a hole 27 of the first housing 1, and a crank arm 28 is attached to the end 26. Also is
a conventional brake spring 32 between an outer peripheral surface of the associated part 22 and an inner one
Peripheral surface of the first housing 1 inserted, and both ends 30 and 31 of the brake spring 29 are in gaps or

EPO COPY (

"*" -Jf "'■""3AA1790

Column inserted between the recess part 23 and the associated protrusion 24 are present.

As shown in Figs. 9 and 10, in the case where the crank arm 28 is not receiving any torque, it is the side surface of the recess part 23 in contact with the side surface of the associated projection 24. The first part presses against the second part. In addition, it is not easy to rotate the drum 4 by yourself because of the tension of the Wires 32 and 33 receives. Thus, the crank arm 28 does not wobble.

While the crank arm 28 is rotated in the direction of arrow A or in the direction of arrow B, the first are Pressure projection 65 or the second pressure projection 66 in the state that they are between the bottom surface 22a or 22b of the associated part 22 and the second side surface 8 of the drum 4 are inserted, as shown in FIGS. 14a and 14b. As a result, the drum can 4 does not move to the side of the associated part 22 on the shaft 3, and the drum 4 is in the direction of the Pawl plate 5 pressed. Accordingly, the slipping effect of the ratchet teeth 7 and 12 is avoided, and it excessive elastic stretching due to the freewheeling movement in wires 32 and 33 does not occur.

In the drive device according to the invention, the Looseness of the respective wires 32 and 33 is eliminated in the manner described below.

When the crank arm 28 is rotated in the direction of arrow B, the side surface of the recess part 23 is in FIG Contact with the side surface of the associated projection 24 in the state shown in FIGS. 13 and 14. If then the crank arm 28 is released by hand at the same time as the rotation of the crank arm 28 is stopped, rotates the crank arm 28 in the direction of arrow] es Λ according to 8 due to the pressure force or the spiral encoder 25 and

"epo copy

'M' 3Ü179 (

returns through the state according to FIGS. 11 and 12 to the state according to FIGS. 9 and 10. In the state according to FIGS. 11 and 12, neither the first pressure projection 65 nor the second pressure projection 66 is inserted between the bottom surface 22a or 22b of the associated part 22 and the second side surface 8 of the drum 4. Thus, the drum 4 can move in the direction of the arrow P_ by a gap h. Accordingly, the loosening or permanent stretching occurring in the wires 32 and 33 is easily eliminated by the idling movement of the ratchet teeth 7 and 12, namely by the action of the coil spring 19 on the way from the state shown in FIGS. 13 and 14 to the state according to Fig. 9 or 10.

As a torque generating device between the drum 4 and the pawl plate 5 for generating an idling movement For example, a spiral spring 19 according to FIG. 8 can preferably be used. As shown in Fig. 8, a spiral spring 19 is preferably used which has one end 20 in the first engagement groove 17 of the Projection 16 of the pawl plate 5 and with the other end 21 in the second engagement groove 18 of the inner peripheral surface of the second housing 2 is inserted, since the size of the coil spring 19 is not influenced by the size of the drum 4 is limited.

The ratchet or pawl element according to the invention is not limited to the pawl plate 5. As in Fig. 15 shown, a ratchet drum 4a having a configuration similar to that of the drum 4 can be used as the pawl part in which it is possible to wind the second wire 33 on the outer peripheral surface.

Furthermore, as shown in FIG. 16, a pawl plate 5 can be used with a small cylindrical projection 5b as a ratchet or pawl part, the Ratchet plate 5 is housed in the drum 4 and an end portion of the second wire around its peripheral surface

EPO COPY

can be wrapped.

Although the direction of the relative torque of the drum 4 and the associated part 22 due to the elastic part, for example the helical spring 25 according to FIG. 10, is not limited ', the direction of the torque due to the elastic part is preferably the direction -in which the drum 4 is rotated in the direction of engagement of the ratchet teeth 7 with the ratchet teeth 12, as it is Figures 8 or 9-14 show. Once the crank arm 28 in the direction of the idle movement of the ratchet teeth 7 and 12 has been rotated, the associated part 22 is rotated by the helical spring 25. Thus, the loosening and the permanent elongation of the wires can be easily eliminated.

The drive device according to the invention can be used not only in a window regulator with an inverted J-shape, as shown in FIG. 3, but also in other types of window regulators, such as those shown in FIGS. 17 and 18, for example. The window lifter according to FIG. 17 has a drive device 48 and a guide rail. 45 mounted separately on a door of a motor vehicle or ^{1 the} like. Between the drive device and the guide rail 45, wires 32 and 33 are in three! angular shape stretched. In the window regulator shown in Fig. 18, two wires 32 and 33 are used, which are slidably guided by outer casings or jackets 35 and 38 and are arranged in a triangular constellation.

In Fig. 19, reference numerals 1 and 2 denote a first case and a second case, respectively. A whole case consists of the first housing 1 and the second housing 2. The housing contains and supports a rotatable drive part 70. The drive part 70 consists of a shaft 3 and a shell-shaped, co-rotating associated one Part 22 which extends radially from shaft 3. That associated part 22 can, for example, by welding

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344179C

be attached to the shaft 3. Pas associated part 22 is with a wing-shaped recess part 23 along his cylindrical circumferential part provided.

A drum 4 is rotatably mounted on the shaft 3 for winding the wires 32 and 33. The drum 4 is adjacent at the associated part 22. The drum 4 is provided with an associated projection 24 which is in the Is able to rotate with the recess part 23 of the associated part 22 with some play in the direction of rotation The assigned projection 24 has a wing-shaped cross section.

As shown in Fig. 21, a central part is the drum 4 with a first bore 71, which can be in direct contact with the shaft 3, and a second bore 72 ver see whose diameter is greater than the diameter d shaft 3. The second bore 72 is coaxial with the first bore tion 71. When the shaft 3 is inserted into the bores 71 and 72 of the drum 4, a cylindrical space 73 is created Helical spring 25 is inserted into the cylindrical space 73 and both ends 25a and 25b of the helical spring 25 are with it the associated part 22 or the drum 4 in engagement. In this case, the helical spring 25 receives a torsional deflection, so that the helical spring 25 presses the drum 4 in the direction of arrow B, that is, in the direction of Idle movement of ratchet teeth 7 and 12.

In addition, the helical spring 25 preferably presses the drum 4, which can be moved in the axial direction, towards the pawl plate 5.

In addition, in Fig. 19, reference numeral 7 denotes first ratchet teeth that are on the other surface side of the -35 drum 4 are formed, and the reference numeral 5 denotes a ratchet plate with second ratchet teeth 12, the can comb with the first ratchet teeth 7. The pawl plate 5 is printed in such a direction that a

EPO COPY

Idle movement occurs between the first and second ratchet teeth 7 and 12, that is, in the direction of the arrow A in Fig. 19. The coil spring 19 has one end engaged with the second housing 2 and engaged with the other End with a projection 16 of the pawl plate 5 in engagement.

The pawl plate is provided with an engaging part 14, which can come into engagement with a wire end 13 of a second wire 33. The wire end 9 of the first wire 32 is engaged with an engaging part 10 on the drum 4. The ratchet plate 5, the first and second ratchet teeth 7 and 12, and the coil spring 19 constitute a wire tension adjusting mechanism. The pawl plate 5 and the second housing 2 form a container for receiving the Coil spring 19.

If the crank arm 28 according to FIG. 19 does not receive any torque, the associated part 22 is moved in the direction of arrow A. FIG pressed by the helical spring 25 according to FIGS. 20 and 21. Thus, a side surface 23a of the recess part presses 23 constantly against a side surface 24a of the associated projection 24, which is opposite the one side surface 23a. The drum 4 itself is hardly rotatable because the

Drum 4 is connected to the window pane, for example with the window pane 100 according to FIG. 24, specifically via the wires 32 and 33.

Accordingly, the shaft 3 and the crank arm rotate 28 not opposite the drum 4. This prevents the crank arm 28 from wobbling. When the crank arm 28, like 19 it shows, is rotated in the direction of arrow B, the associated part 22 rotates against the pressure force the helical spring 25 in the area of play, the drum 4 being stationary. Then the other side surface pushes 23b of the recess part 23 against the other side surface of the associated projection 24. As a result, can rotate the drum 4. When the rotary actuation has ended, the associated part 22 returns to the state shown in FIG

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and 21 back.

344179C

When the crank arm 28 according to FIG. 19 from the state according to Fig. 20 and 21 is rotated in the direction of arrow A, the drum 4 is rotated directly in the direction of arrow A!

since the one side surface 23a of the associated part 23 v < forth in contact with one side surface 24a of the associated projection 24. In the drive according to the invention device is the one pin 31 of the brake spring 29 between one side surface 23a of the recess part 23 and one side surface 24a of the associated projection 24 without Game used in the state shown in FIGS. On the other hand, there is a certain amount of play between the other side surface 23b of the recess part 23 and the other Sc:

ten surface of the associated projection 24. Corresponding the unlocking operation and the locking operation take place in the normal way.

The one used in the drive device according to the invention Helical springs can be used in any drive device with a drum and drive part that are mutually exclusive are assigned or rotate together with some play in the direction of rotation. For example, the helical spring can easily be used in a conventional drive device according to FIG.

With regard to the drive device according to FIG. 25, the same spring as the helical spring according to FIG. 19 can be between a drum 108a and an associated part 117 are inserted will.

In the drive devices with a mechanism that automatically regulates the tension of the wires by means of the ratchet teeth is capable of, for example in the case of the drive devices according to FIG. 19 or 25, the helical spring 25 of the drive device according to the invention behaves also as an elastic part, which one ratchet teeth. against the other in the axial direction

EPO COPY I

Ratchet presses so that both sets of ratchet teeth are strongly engaged with each other. Accordingly, the helical spring 25 can instead of a conventional wave-shaped Washer 121 according to FIG. 25 can be used.

in the manner described above, the mechanism that a wobbling or dangling movement of the crank arm is prevented, in the case of a wide variety of wire drive devices or Windows can be used, for example for the Window lifter according to FIGS. 17 and 18.

As explained in detail above, the drive device according to the invention has the advantageous properties that a loosening and constant stretching of the wires can be eliminated, that the tension of the wires in one suitable range can be maintained because the slipping effect is prevented, and that a wobble or The dangling movement of the crank arm is safely switched off.

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Claims (13)

Applicant; G 54763 NIPPON CABLE SYSTEM INC. 34 41790. Sakae-machi 1-chome, Takarazuka-shi, Hyogo-ken, Japan Drive device for a window regulator. Sponsorship claims 15 1. Drive device for a window regulator, characterized by (a) a housing (1, 2); (b) a drum (4), which for a rotary movement in the 20 'housing (1, 2) designed and a first side surface (6) with first ratchet teeth (7), a second side surface (8) with a first engagement part (10) for engagement with a first wire end (9) as well has a circumferential surface (36) as a winding surface, (c) a pawl plate (5) coaxial aft the drum (4) is arranged adjacent and the one surface (11), which with second ratchet teeth (12) for engagement with the first ratchet teeth (7) of the Drum (4) as well as with a second engagement part (14) is provided for engagement with a second wire end (13); (d) a spiral spring (19) which with one end (20) to the pawl plate (5) and with the other end (21) with the housing (1, 2) engages and which presses the latch plate (5) in such a direction that the local tone latches (7) and cUe Kl I nkpnziUiru »(1?) - n1.oh tin 1 ^1% γρ.Ι.1 mir 1k> w * h | ( <m; BATH (e) an elastic part (25), which the drum (4) pushes in the axial direction towards the pawl plate (5); ν (f) a shaft (3), which by the engagement (22, 23, 24) the drum (4) rotates with the drum (4). 5 2. Device according to claim 1, characterized in that the pressure direction of the spiral spring (19) of the direction of the Lifting a window pane (G) corresponds. 3. Device according to claim 1 or 2, characterized in that the compression torque of the spiral spring (19). size is than the torque of the freewheeling movement of the first ratchet teeth (7) and the second ratchet teeth (12). 4. Device according to one or more of claims 1 to 3, characterized in that the second engagement part (14) of the ratchet plate (5) is located outside the second ratchet teeth (12) in the radial direction. 5. Device · according to one or more of claims 1 bi 3, characterized in that the second engagement part (54, 55) of the ratchet plate (53) is located in the radial direction inside the second ratchet teeth (12). 6. Device according to one or more of claims 1 to 5, characterized in that the one side surface de Drum (56) has a cylindrical groove (57) around the axis of the Tro mel (56), with a spiral-shaped winding groove from the peripheral surface of the drum (56) in the vicinity the one side surface to the cylindrical groove (5 that the pawl plate (58) extends a cylindrical Has projection (59) which can be inserted into the cylindrical groove (5, the cylindrical projection (59) the second engaging part (60) has, and that a winding surface on a peripheral surface (61) of the cylindrical Projection (59) is formed. EPO 7. Device according to one or more of claims 1 to 6, characterized in that the diameter of the The spiral spring (19) in the state of being inserted into the housing (1, 2) is larger than the diameter of the drum (4). 8. Drive device for a window regulator, characterized by: (a) a housing (1, 2); (b) a drive part (3, 22) with a shaft (3) which is capable of rotating within the housing (1, 2) is designed, and with an associated, co-rotating part (22) which is attached to the shaft (3) is, wherein the associated part (22) extends from the shaft (3) in the radial direction and at least a recess part (23) along a peripheral edge of the associated part (22); (c) a drum (4) provided in the housing (1, 2), which are arranged adjacent to the associated part (22), provided coaxially to the shaft (3) to the The shaft (3) is rotatable and can be moved in the axial direction along the shaft (3), as well as an associated projection (24), which on one side surface (8) of the drum (4), the associated part (22) "arranged opposite one another and can be moved along with the recess part (23) with some play in the direction of rotation is, wherein first ratchet teeth (7) on a second side surface (6) of the drum (4), the first Side surfaces (8) of the drum (4) are provided opposite one another; (d) a pawl part (5) which is accommodated within the housing (1, 2) and adjoins the drum (4), arranged coaxially to the shaft (3) and rotatable about the shaft (3) as well as second ratchet teeth (12) on a first side surface (11) of the pawl part ^. (5), the drum (4) opposite, wherein the second ratchet teeth (12) can be brought into meshing engagement with the first ratchet teeth (7); EPO COPY -4- 3U1790 (e) a spiral spring (19) which fits between the pawl part (5) and dom Geh'iuno (1, 2) and which the pawl part (5) in the direction of the freewheeling movement of the first ratchet teeth (7) and the. second ratchet teeth (12) pushes; (f) an elastic part (25) which extends between the Drum (4) and the associated or moving part (22) is to the associated To push part (22) in the direction of rotation; (g) a first wire (32), one end (9) of which engages the drum (4), and a second wire (33) which has one end (13) in engagement with the pawl part (5); and (h) a first pressure projection (65) and a second pressure projection (66) on the two undersides of the associated projection (22) attached and between the bottom surfaces (22a, 22b) of the associated Part (22) or one side surface (8) of the drum (4) can be used. 20th 9. Device according to claim 8, characterized / that the elastic part (25), the drum (4) and the associated part (22) in the direction of the freewheeling movement the two ratchet teeth (7, 12) presses. 25th 10. Device according to claim 8 or 9, characterized in that that the pawl part (5) is a pawl plate. 11. Device according to one or more of claims 8 to 10, characterized in that the pawl part is a pawl drum (49), the second wire (33) on a peripheral surface of the ratchet drum (4a) is windable. EPO COPY 12. Drive device for a window regulator, characterized by: (a) a housing (1, 2); <b) a drive part (3 _f 22) with a shaft (3) which is designed for a rotary movement in the housing (1, 2), and with an associated part (22) fastened to the shaft (3), which extends from the shaft (3) in the radial direction and has at least one recess part (23) along a peripheral edge of the associated part (22); (c) a drum (4) accommodated in the housing (1, 2) and adjacent to the associated part (22), provided coaxially to the shaft (3) and rotatable about the shaft (3) and an associated one or having a projection (24) moving with it, the projection (24) on the one side surface (8) of the drum (4), the associated part (22) arranged opposite one another and with some play can be moved in the direction of rotation with the recess part (23); and (d) an elastic part (25) which the associated part (22) by the engagement of one end (25b) of the elastic part (25) with the drum (4) and through the engagement of the other end (25a) of the elastic part (25) is acted upon by the drive part (22) in the direction of rotation. 13. Device according to claim 12, characterized in that that the elastic part (25) is a helical spring. 30th EPOCOPY (t