DE8813053U1 - Length-adjustable cable pull - Google Patents

Description

VOFA-WERK XAVLER V0RBRÜGGEN GmbH & Co KG, Schiess-Strasse 30, D-4000 Düsseldorf 11

Length-adjustable cable pull

The invention relates to a length-adjustable cable pull with the following features:

a) the cable has one strand, possibly divided into strand sections;

b) the strand or strand sections are guided in a sheath, or in sheath sections, so that they can move;

c) one end of the strand or the sheath or two opposite ends of the strand sections or the sheath sections are fixed in an adjustment device for length adjustment.

Cable pulls are often used to operate units and devices, especially in motor vehicles. Such cable pulls usually consist of a wire strand and a tubular sheath. For the precise function of such cable pulls, it is essential that the effective length of the wire strand can be adjusted in advance. This length adjustment can be achieved by directly changing the length of the wire strand itself or a strand section or by adjusting the length of the sheath or sheath sections between two

The adjustment devices known for this purpose are complicated and only allow a gradual change in length.

The invention is based on the task of designing the adjustment device for a cable pull of the type mentioned above in such a way that the effective length of the strand is continuously adjustable and, after adjustment, a secure hold is nevertheless provided.

This object is achieved according to the invention by a cable pull with the following features:

d) the adjustment device has a clamping device;

e) the clamping device has a U-shaped clamping plate;

f) the clamping plate is held axially immovable in the clamping device;

g) in the U-legs of the clamping plate there are through holes opposite each other;

⁽ h) the end of the strand or of the sheath or of one of the strand sections or of the sheath sections passes through both through-holes;

i) the edges of the through holes rest against the end with opposite preload;

(j) the adjustment device has a slider accessible from the outside;

k) the slide has at least one

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displacement cams;

I) the slider is assigned to the clamping plate in such a way that by its operation the U-legs can be moved against their respective pre-tension to a position in which the pre-tension for the system at the end of the strand or the sheath or the strand section or the sheath section is removed.

With this adjustment device, for the first time, a Cable pull is realized in which the effective length of the Wire strand can be continuously changed. For a Length adjustment, the slider is moved towards the U-shaped clamping plate moves with the result that the Displacement cams move the two U-legs against their Pre-tensioning so that the edges of the Through holes no longer have to be pre-tensioned at the Surface of the end of the strand or the sheath or

of the strand section or the sheath section, so that this end can be easily moved in the axial direction. After the length has been adjusted, the

Slider moves away from the clamping plate again with the result,

that the U-legs again come to the surface of the end of the strand or the sheath or the strand sections or the sheath sections under opposite

Apply preload. In this position, the 1n will The end lying through the holes is held in a non-slip manner.

an axial load on the strand or the sheath or the strand section concerned or the

The sheath section increases the Line pressure of the U-leg corresponding to the Prestress in «Mt direction ^d »r respective load

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Of course, it is possible to arrange several of these clamping plates one behind the other in the axial direction and to provide a slider for the simultaneous loading of the clamping plates or several such sliders. For most applications, however, one clamping plate is sufficient. The clamping plate itself is preferably made of metal, especially spring steel, but can also be made of other materials.

In an embodiment of the invention, it is provided that the preload is directed against each other and the displacement cam can be inserted between the two U-legs, preferably in the direction of the opening between the free ends of the U-legs.

In a further embodiment of the invention, it is proposed that the clamping plate is arranged in a shaft-like recess in the clamping device, into which the displacement cam(s) protrude and in which the slide is guided. It is also provided that the slide has guide arms on the outside that rest against the adjustment device so that the sliding function is provided without problems. The guide arms should have projections and the adjustment device should have stops to limit the mobility of the slide in the direction away from the clamping plate so that the slide cannot get lost. The projections are expediently directed inwards.

The locking cam(s) are advantageously wedge-shaped. In addition, the free edges of the U-legs should be bent in the opposite direction to the respective pre-stress. Both measures promote the

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Bending of the U-legs in the sense of the invention.

According to the invention, it is further proposed that the displacement cam(s) is/are designed in such a way that the pre-stressed contact of the U-legs at the end of the strand or the sheath or the strand section or the sheath section is canceled when the displacement cam(s) is/are in contact with this end. In this way, the end serves as a stop for the slide and defines its end position in which the end of the strand or the strand section is released.

The end of the strand or the sheath or the strand section or the sheath section that passes through the through holes in the clamping plate is expediently designed as a rigid pin. It is also advantageous if a safety device is placed on the end of the strand or the sheath or the strand section or the sheath section that protrudes above the clamping plate and stops are provided for the safety device to limit the axial mobility of the strand end.

The invention is illustrated in more detail using an embodiment in the drawing. They show:

Figure 1 shows a longitudinal section through a

Adjustment device for a cable pull;

Figure 2 shows a cross section through the

Adjustment device according to Figure 1n of plane A-A;

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Figure 3 shows a longitudinal section through a

additional adjustment device for a cable pull.

The adjustment device (1) shown in Figures 1 and 2 has a cuboid-shaped housing body (2) made of a plastic material in which two shaft-shaped recesses (3, 4) are molded. The front warning (5) on the left in Figure 1 and the partition wall (6) -

the two recesses (3, 4) each have through holes (7, 8) aligned with each other, through which the

■ End section (9) of a strand section is inserted. The

! End section (9) thus passes through the left recess (3)

and protrudes into the recess on the right (4).

] In the left recess (3) a cross-sectional

U-shaped clamping plate (10) made of spring steel is inserted.

; Below the end section (9) it is in both axial

direction and transversely to it. Their U-shaped legs protrude upwards beyond the end section (9) and point away from each other.

j has end legs (13, 14) directed away. The U-legs (11,

' 12) have through holes (15, 16) approximately in their middle

through which the end section (9) of the strand section is inserted. The diameter of these through holes (15, 16) is only slightly larger than that of the end section (9).

The U-legs (11, 12) have a prestress directed against each other. Without the end section (9) inserted through, the U-legs (11, 12) would be in contact with each other under prestress in the area of the bends to the end legs (13, 14). In the installed state shown in the figure, they are made by the edges of the through holes (15, 16) being in contact.

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en dtp lateral surface of the strand section (9) is prevented from doing so. Due to this oppositely pre-stressed system, slipping of the strand section (9) through the through holes (15, 16) in the U-legs (11, 12) is not possible, i.e. the end section (9) is fixed in position in the adjustment device. Any increase in the axial load on the strand section leads to a corresponding increase in the clamping force between the edges of one of the through holes (15) or (16).

A slider (17) is inserted from above into the left recess (3) (Figure 1). As can be seen better from Figure 2, the slider (17) consists of a cross yoke (18) and downward-facing guide arms (19, 20) connected to the outside of this. The guide arms (19, 20) rest with their inner sides on the outer side walls (21, 22) of the housing body (2). In the area of their lower ends, the guide arms (19, 20) have inward-facing, hook-shaped projections (23, 2A) that engage in recesses (25, 26) in the housing body (2), where stops (27, 28) are formed, against which the projections (23, 24) rest in the position of the slider (17) shown. This limits the mobility of the slide (17) in the upward direction.

In the area of the left recess (3) (Figure 1), the side walls (21, 22) of the housing body (2) have notches (29, 30) which allow the slide (17) to move downwards. The cross yoke (18) of the slide (17) is guided in the axial direction by the inner sides of the front wall (5) and the partition wall (6), even in its uppermost position shown here.

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A wedge-shaped displacement cam (31) is formed on the lower side of the cross yoke (18), the tapered, lower free end of which projects into the gap between the U-legs (11, 12) of the clamping plate (10). In the uppermost position of the slide (17), the displacement cam (31) is not yet in contact with the U-legs (11, 12). In the middle area, the displacement cam (31) has a semicircular recess (32), the radius of which is slightly larger than that of the end section (9). In this way, the displacement cam (31) can be pushed over the end section (9).

The right-hand rear wall (33) of the adjustment device (1) has a slot (34) extending to the right-hand recess (4) with a clip-in device (35). This clip-in device (35) is known per se, so that a more detailed description is omitted. The opposite and thickened end (36) of the other strand section (37) is inserted into it and fixed. This strand section (37) is held axially immobile relative to the adjustment device (1). Alternatively, the adjustment device (1) can also be directly connected to the object to be operated or attached to it.

To axially adjust the end section (9) within the adjustment device (1) and thus the effective length of the entire strand, the slider (17) is moved downwards. Due to the wedge-shaped design, the displacement cam (31) comes into contact with the inside of the U-legs (11, 12) and then gradually pushes them apart. The slider (17) reaches its end position when the underside of the cross yoke <18) is on the

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The displacement cam (31) is shaped so that the U-legs (11/12) are exactly perpendicular and parallel to one another. In this position they are no longer under pre-tension against the casing of the end section (9). This can then be moved axially in the desired direction and the length of the strand can be adjusted. A locking ring (38) which is placed on the free end of the end section (9) which protrudes into the right-hand recess (4) ensures that the end section (9) cannot slip out of the adjustment device (1). After the length adjustment has been made, the slide (17) is moved back up into the position shown. Due to the pre-tension, the U-legs (11, 12) come back into contact with the end section (9) and fix its position relative to the adjustment device (1).

If you want to avoid unintentional operation of the slide (17), the guide arms (19, 20) can be bent outwards and the slide can then be removed.

Figure 3 shows a slightly different adjustment device (41). It also has a cuboid-shaped housing body (42) in which two shaft-shaped recesses (43, 44) are formed. The front wall (45) on the left and the partition wall (46) between the two recesses (43, 44) each have through holes (47, 48) that are aligned with one another. In contrast to the embodiment according to Figures 1 and 2, the end section (49) of a sheath section (50) of a cable pull is inserted through these through holes (47, 48). It therefore passes through the left recess.

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(A3) and extends into the right recess (44).

A clamping plate (SD) is inserted into the recess (43) which is identical to the clamping plate (10) in the embodiment in Figures 1 and 2, so that for a more detailed description of this, reference is made to the explanations therein.

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also has through holes (52, 53) in its center, through which the end section (49) of the primary casing section

(50) is inserted through. The U-legs (54, 55) here also have a prestress directed against each other and thus the same effect as in the embodiment according to Figures 1 and 2. They therefore rest with the KarVM;n of their through holes (52, 53) of the end section (49) and thereby fix it.

In the left recess (43) above the clamping plate

(51) a slide (56) is arranged, which is identical to the slide (17) in the embodiment according to Figures 1 and * In this respect, reference can also be made to the description there. It has a transverse yoke (57), on the lower side of which a wedge-shaped displacement cam (58) is formed.

The rear wall (59) on the right is designed somewhat differently from the corresponding rear wall (33) in the previously described embodiment. It does not have a slot, but rather an outwardly projecting grommet (60) with a through hole (61) that is coaxial with the end section (49). The through hole (61) has a step (62) against which another sheath section (63) is supported. A strand (64) runs through both sheath sections (50, 63) and through the end section (49). It can be inserted into the

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Sheath sections (50, 63) to operate v connected device. The end section

(49) is designed as a hollow stud bolt with a smooth dumbbell, which is placed on the end of the casing section

(50) is attached.

With the help of this adjustment device (41), the length of the sheath, which is made up of the two sheath sections (50, 63), can be changed between two fastening points at which the sheath is fixed. This also changes the effective length of the strand (64). The length change of the sheath takes place in the same way as in the embodiment according to figures 1 and 2. To do this, the slider (56) is moved downwards. Due to the wedge-shaped design, the displacement cam (58) comes into contact with the inside of the U-legs (54, 55) and then gradually pushes them apart. In the end position of the slider (56), the U-legs (54, 55) are exactly vertical and parallel to one another. They then not only rest against the barbell of the end section (49) under pre-tension. This can then be moved axially in the desired direction. After the length adjustment has been made, the slide (56) is moved back up into the position shown. Due to the pre-tension, the U-legs (54, 55) come back into contact with the end section (49) and fix its position relative to the adjustment device (41).

Of course, the adjustment device (41) can also be arranged at the end of a casing. It is then fixed and then placed at the end of the casing.

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Claims (12)

Claims: VOFA-WERK XAVIER VORBRÜGGEN GmbH * Co. Schiess-Straße 30, D-4000 Düsseldorf Length-adjustable cable pull 1. Length-adjustable cable pull with the following features: a) the cable has one strand, possibly divided into strand sections; b) the strand or strand sections are guided in a sheath, if necessary in sheath sections, so that they can move; (c) one end of the strand or sheath or two opposite ends of the strand sections or of the sheath sections is or are fixed in an adjustment device for length adjustment; characterized by the following features: d) the adjusting device (41) has a clamping device; e) the clamping device has a U-shaped clamping plate (10, 51); f) the clamping plate (10/51) is held axially immovably in the clamping device <1); g) in the U-legs (11, 12) of the clamping plate (10, 51) there are opposing through holes (15, 16; 52, 53); h) the end (9, 49) of the strand or the sheath or of one of the strand sections or
Sheathing sections (50) pass through both through holes (15, 16); i) the edges of the through holes (15, 16; 52, 53) are applied to the end (9, 49) with opposite preload; j) the adjustment device (1, 41) has a slide (17, 56) accessible from the outside; ; k) on the inside, the slide (17, 56) has at least a displacement cam (31, 58); I) the slide (17, 56) is associated with the clamping plate (10, 51) ] in such a way that by its operation the - U-legs (11, 12; 54, 55) against their respective Pre-tensioning can be moved into a position in which the pre-tensioning for the installation at the end (9, 49) of the strand or sheath or the strand section or sheath section (50) is removed. 2. Cable pull according to claim 1, characterized in that the prestressing of the U-legs (11, 12; 54, 55) is directed against each other and the displacement node (31, 58) can be introduced between the two U-legs (11, 12; 54, 55). &igr;«&igr; iti ·· <&igr; ft &igr; · >&Igr; » · · It · ItI II· · I S · Ml Il ItIM ·· ·■ 3. After the test 1 of the Z, characterized in that the slide (17, 56) is movable in the direction of the opening between the free ends (13, 14) of the U-legs (11, 12; 54, 55). 4. Cable pull according to one of claims 1 to 3, characterized in that the clamping plate (10, 51) is arranged in a shaft-like recess (3, 43) into which the displacement cam(s) (31, 58) protrude and in which the slide (17, 56) is guided. 5. Cable pull according to one of claims 1 to 4, characterized in that the slide (17, 56) has guide arms (19, 20) on the outside of the adjustment device (1). 6. Cable pull according to claim 5, characterized in that the guide arms (19, 20) have projections (23, 24) and the adjusting device (1, 41) have stops (27, 28) for limiting the mobility of the slide (17, 56) in the direction of the clamping plate (10, 51). 7. Cable pull according to claim 6, characterized in that the projections (23, 24) are directed inwards* 8. Cable pull according to one of claims 1 to 7, characterized in that the displacement cam or cams (31, 58) is or are wedge-shaped. 9. Cable pull according to one of claims 1 to 8, - 4 - i characterized in that «He-free edges (13/ 14) of the U-legs (11/ 12; 54/ 55) are unbent in the opposite direction to the respective prestressing. 10. Cable pull according to one of claims 1 to 9, characterized in that the displacement cam or cams (31, 58) is designed in such a way that the possible engagement of the cams (11, 12; 54, 55) at the end (9) of the strand or sheath or of the strand section or sheath section (50) is canceled when the displacement cam or cams (33, 58) engage at this end (9, 49). 11. Cable pull according to one of claims 1 to 10, characterized in that the end (9, 49) of the strand or sheathing or of the strand section or sheathing section (50) which passes through the clamping plate (10, 51) is designed as a rigid pin. 12. Cable pull according to one of claims 1 to 11, characterized in that a safety device (36) is attached to the end (9, 49) of the strand or sheath or of the strand section or sheath section (50) protruding beyond the clamping plate (10, 51) and stops are provided for the safety device (36) to limit the axial movement of the end (9, 49).