CA2231675C - Motor vehicle trailer coupling - Google Patents
Motor vehicle trailer coupling Download PDFInfo
- Publication number
- CA2231675C CA2231675C CA002231675A CA2231675A CA2231675C CA 2231675 C CA2231675 C CA 2231675C CA 002231675 A CA002231675 A CA 002231675A CA 2231675 A CA2231675 A CA 2231675A CA 2231675 C CA2231675 C CA 2231675C
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- CA
- Canada
- Prior art keywords
- bar
- trailer coupling
- coupling
- drive
- trailer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The invention relates to a trailer coupling for motor vehicles with a bar on which a ball is located in the usual manner. So that the bar does not protrude beyond the rear bumber of a vehicle, it may be adjusted by motor into a suitable idle position.
Description
° Description The invention relates to a trailer coupling for motor vehicles with a tow-bar which is formed adjustable and lockable with a positive fit between an idle position and an operating position.
As long as trailer couplings are not used the ball-bar protruding beyond the rear bumber disturbs. For solving this problem trailer couplings are known whose ball-bar may be disassembled.
Furthermore from the US document US-A-3,545,791 there is known a trailer coupling for motor vehicles which is pivotably mounted on the frame of a vehicle. It is 'the object of this known device to~provide a coupling which offers the possibility for vehicles provided with a loading platform at the rear end,' for this coupling to be mounted on the platform without inhibiting the normal use of the platform. For this purpose it is designed slightly pivotable. The folding out and folding in is effected manually.
From the French document FR-A- 2 4',~6 554 there is further known an axially adjustable trailer coupling which is locked with a positive fit, wherein however for assuming the end positions the lockings must be manually released and then set again in order to displace or turn the coupling itself.
EP-A- 0 274 788 shows a trailer coupling without a motor, which is axially adjustable in length.
The Gez~nan patent document DE-A- 34 42 514 describes a dismountable coupling which is axially inserted into a tube piece on whose one end there is located a screw which can be screwed into a corresponding inner thread of the inserted coupling in order to secure this coupling. The rotation of the screw can for securing be effected by motor. The Gexman Utility Model DS-U- 91 09 699.5 on the other hand shows a coupling which caa remain on the vehicle and is formed so that it can be folded away when not in use . In the vertical direction as well as alternatively in the horizontal direction this coupling is folding. For folding out, the coupling is automatically locked by a bar which is under spring pressure. For folding in, the bar must be manually displaced into the opened position. In tree French document FR-A-2,513,567 on the other hand there is shown an axially displaceable trailer coupling which is manually displaceable by way of a very bulky spindle-nut drive.
Generally it has been found disadvantageous with the known trailer couplings that the design is not comfortable to operate and demands much space.
It is the object of the invention to provide a trailer coupling, which permits with a compact form, without physical exertions for the trailer coupling to be brought from a secured operating position into a non-disturbing idle position and'when required also able again to be displaced without physical exertion into the secured operating position.
The invention is described in more detail by way of a preferred embodiment form with reference to the drawings, wherein further advantageous details can be deduced from the drawings. The same parts with regard to their function are provided with the same reference numerals.
In accordance with one aspect of this invention, there is provided a trailer coupling for motor vehicles, comprising a towing bar formed so as to be axially displaceable between an inoperative position and an operating position; a spindle and nut drive for displacing said towing bar between said positions, said towing bar being formed as a part of said spindle and nut drive; and a motor with which said towing bar is connected for displacement of said towing bar, said towing bar being formed so as to be rotatable about its axis.
In accordance with another aspect of this invention, there is provided a trailer coupling for motor vehicles, comprising a bar which is swivelable between an inoperative position and a locked horizontal operating position; and at least one drive provided for swiveling locking and unlocking motions of said bar, said at least one drive being formed so that it positively locks and unlocks automatically upon swiveling into or out of said operating position, wherein the bar is swivelable from said operating position into said inoperative position upwardly or horizontally by about 90°.
As long as trailer couplings are not used the ball-bar protruding beyond the rear bumber disturbs. For solving this problem trailer couplings are known whose ball-bar may be disassembled.
Furthermore from the US document US-A-3,545,791 there is known a trailer coupling for motor vehicles which is pivotably mounted on the frame of a vehicle. It is 'the object of this known device to~provide a coupling which offers the possibility for vehicles provided with a loading platform at the rear end,' for this coupling to be mounted on the platform without inhibiting the normal use of the platform. For this purpose it is designed slightly pivotable. The folding out and folding in is effected manually.
From the French document FR-A- 2 4',~6 554 there is further known an axially adjustable trailer coupling which is locked with a positive fit, wherein however for assuming the end positions the lockings must be manually released and then set again in order to displace or turn the coupling itself.
EP-A- 0 274 788 shows a trailer coupling without a motor, which is axially adjustable in length.
The Gez~nan patent document DE-A- 34 42 514 describes a dismountable coupling which is axially inserted into a tube piece on whose one end there is located a screw which can be screwed into a corresponding inner thread of the inserted coupling in order to secure this coupling. The rotation of the screw can for securing be effected by motor. The Gexman Utility Model DS-U- 91 09 699.5 on the other hand shows a coupling which caa remain on the vehicle and is formed so that it can be folded away when not in use . In the vertical direction as well as alternatively in the horizontal direction this coupling is folding. For folding out, the coupling is automatically locked by a bar which is under spring pressure. For folding in, the bar must be manually displaced into the opened position. In tree French document FR-A-2,513,567 on the other hand there is shown an axially displaceable trailer coupling which is manually displaceable by way of a very bulky spindle-nut drive.
Generally it has been found disadvantageous with the known trailer couplings that the design is not comfortable to operate and demands much space.
It is the object of the invention to provide a trailer coupling, which permits with a compact form, without physical exertions for the trailer coupling to be brought from a secured operating position into a non-disturbing idle position and'when required also able again to be displaced without physical exertion into the secured operating position.
The invention is described in more detail by way of a preferred embodiment form with reference to the drawings, wherein further advantageous details can be deduced from the drawings. The same parts with regard to their function are provided with the same reference numerals.
In accordance with one aspect of this invention, there is provided a trailer coupling for motor vehicles, comprising a towing bar formed so as to be axially displaceable between an inoperative position and an operating position; a spindle and nut drive for displacing said towing bar between said positions, said towing bar being formed as a part of said spindle and nut drive; and a motor with which said towing bar is connected for displacement of said towing bar, said towing bar being formed so as to be rotatable about its axis.
In accordance with another aspect of this invention, there is provided a trailer coupling for motor vehicles, comprising a bar which is swivelable between an inoperative position and a locked horizontal operating position; and at least one drive provided for swiveling locking and unlocking motions of said bar, said at least one drive being formed so that it positively locks and unlocks automatically upon swiveling into or out of said operating position, wherein the bar is swivelable from said operating position into said inoperative position upwardly or horizontally by about 90°.
The drawings show individually:
Figure 1 an elevation of the trailer coupling according to the invention, with an axial adjustment into the idle position, Figure 2 a lateral view of the trailer coupling according to the invention and according to Figure 1, Figure 3 a lateral view of a ball-bar according to Figure 1, Figure 4 an elevation of a sleeve for receiving the ball-bar according to Figure 3, Figure 5 a lateral view of the sleeve according to Figure 4, Figure 6 a view according to arrow A in Fig. 5, Figure 7 a lateral view of an alternative embodiment forth with a pivotable ball-bar, Figure 8 a section according to line B-B of Figure 7, through the drive of the ball-bar, Figure 9 a lateral view of a further embodiment form with a laterally pivotable coupling bar, and Figure 10 a plan view of the embodiment form according. to F-figure DETAILED DESCRIPTION OF THE INVENTION
In Figure 1 the adjustable trailer coupling is indicated at 1. It consists essentially of an axially adjustable bar 2 whose 3 outer end carries a ball 3 as well as a guiding sleeve 4, a motor with planet gears 6, a spur gear 7 and an adjusting spindle 8.
The guiding sleeve 4 on both sides carries in each case an assembly flange 9 in which there are incorporated threaded bores 10. The whole trailer coupling 1 is assembled onto a vehicle in that by way of screws it is fastened onto a suitable bracket of the vehicle. With this screws engage into the threaded bores 10.
The bar 2 is accomodated by the guiding sleeve 4. For this purpose the bar 2 comprises a rear guiding surface 11 and a front guiding surface 12 which via a cone 13 blend into a somewhat slimmer bar 2.
Furthermore in the guiding sleeve 4 an annular inner cone 14 is fastened. Finally in the guiding sleeve 4 there are formed guiding slots 15.
On the bar 2 in the rear region there is fastened a pin-like connecting rod 16 which engages into the guiding slot 15.
Furthermore in the bar 2 there is incorporated a pocket hole with an inner thread 17.
The adjusting spindle 8 is screwed into the mentioned inner thread 7 and is rotated by an electrical motor via the-spur gear 7 as well as the planet gear 6. The individual gearwheels of the gear 7 are mounted between lateral plates 19 and 20. The housing of the planet gear 6 and the guiding sleeve 4 are rigidly connected to the plate 20. The adjusting spindle 8 is likewise rotatably mounted in the plates 19 and 20 so that it can be rotated by the electrical motor 5 as desired.
If the motor 5 is driven in the corresponding direction, then the adjusting spindle 8 also rotates.
At the same time the bar 2 which is arranged as a nut on the adjusting spindle 8 and is secured against rotation by the connecting member I6 is pushed outwards . With this axial movement the bar 2 is guided in the guiding sleeve 4 by the guiding surfaces 11 and 12. The bar reaches its end position when the outer cone 13 sits rigidly in the annular inner cone 14.
As long as the guiding slots 15 run in the axial direction, the bar 2 maintains its radial position. After roughly half the adjusting distance the guiding slots 15 blend into a spiral-shaped course. This results in the fact that the bar 2 on extending then correspondingly turns so that the ball 3 in the operating position points vertically upwards. The operating position is shown in Figures 1 and 2 by dashed lines.
For a better understanding the essential parts are again individually shown in Figures 3 to 6.
An alternative embodiment form of a trailer coupling is shown in Figure 7. With this embodiment form the bar 2 is not axially displaced, but is pivoted about an axis 24..
For an easier understanding only the bar 2 with its pivoting drive 21 is shown, wherein known additional drive parts such as a gear motor, are not shown.
Figure 7 shows a pivoting drive 21 with which the bar 2 can be pivoted upwardly about approximately 90°.
The drive however can in a slightly modified form serve for passing through other pivoting angles.
With a correspondingly modified installation location, and an adapted bar 42 for this, a modified pivoting drive 41 may also be applied for a horizontal pivoting of the bar 42. Such a pivoting drive 41 is shown in the Figures 9 and 10.
With the embodiment shown in Figure 7 the bar 2 however is pivoted vertically upwards. For this purpose it is pivotably mounted between two plates 22 and 23 about the axis 24 on the pintail 25.
Furthermore the bar 2 comprises a limb 26 whose function can be seen from Figure 8.
In Figure 8 a section corresponding to the marking effected in Figure 7 is shown. In the region of the limb 26 the bar 2 is thus provided with a slot 27. Furthermore perpendicular to the plane of the slot there is provided a bearing bore 28 for the pintail 25, a bearing bore 29 for a pinion shaft 31 as well as a bore with an inner thread 30 for a blocking cone 32.
As mentioned the pintail 25 is rotatably mountedv' between two plates 22 and 23. In the region of the slot 27 of the bar 2, the pintail 25 comprises a toothing 33. A~gearwheel 34 engages into this toothing 33, the gearwheel being mounted on the~pinion shaft 31. With the gearwheel 34 there meshes a further gearwheel 35 which is connected to a shaft 36 in a rotatably rigid manner.
On the shaft 36 on both sides of the gearwheel 35 there is each mounted a blocking cone 32 in a rotatably rigid but axially displaceable manner. This blocking cone 32 comprises an outer thread 37 which engages into the inner thread 30. For the blocking cone 32 a locking opening 38 is provided in the plates 22 and 23.
In the position shown in Figure 8 the blocking cone 32 should be retracted in the usual manner into the locking opening 28. For a better recognition it is shown in a position in which the bar 2 may be pivoted.
The ends of the pinion shaft 31 are guided in arc-shaped slots 39 of the plates 22 and 23. The remaining bores of the plate 22 shown in Figure 7 serve for its fastening onto the vehicle or serve the fastening of a further gear with a suitable electrical drive or the connection by way of distance bolts.
The position of the bar 2 represented in Figure 7 with dashed lines corresponds to its operating position. For pivoting the bar 2 then, a gearwheel 40 rigidly connected to the pintail 25 is driven. Since firstly the blocking cone 32 is retracted into the locking opening 38 of the plate 23, the bar 2 can still not be pivoted about the axis 24. Instead of this via the toothing 33 and via the gearwheel 34 the gearwheel 35 is rotated.
Since this gearwheel is rigidly connected to the shaft 36, the shaft 36 drives the blocking cone 32. Since the outer thread 37 of the blocking cone is engaged with the inner thread 30, at the same time the blocking cone 32 moves axially inwards until it is completely extended out of the locking opening 38. As soon as the blocking cone 32 comes to bear on the gearwheel 35, the gearwheel 35 and the gearwheel 34 which is engaged with it are blocked. By way of this the pintail 25 drives the blocked gearwheel 34 and the pinion shaft 31, so that the pinion shaft 31 is pivoted about the axis 24. At the same time the pinion shaft 31 which is mounted in the bearing bore 29 of the bar 2 then drives this bar so that the bar 2 is pivoted. This pivoting movement finishes as soon as the pinion shaft 31 reaches the end of the slot 39.
For the purpose of clarity it must be mentioned that in Figure 8 the left blocking cone is not shown.
For the electrical drive it is provided for this to be switched off as soon as the land exceeds a previously set limiting value. In this way damages are avoided, in the case that on moving the bar 2 foreign bodies should inhibit the further operation. So that the adjustment cannot be initiated during the journey of the vehicle it is furthermore provided for the trailer coupling to only be able to be operated outside the compartment of the vehicle. It is particularly advantageous when the operating means, for example a switch, is arranged in the boot of the vehicle .
In this manner there is created a vehicle coupling which is easily and comfortably brought into a position in which it no longer disturbs.
~O
List of reference numerals 1 trailer coupling 33 toothing 2 bar 34 gearwheel 3 ball 35 gearwheel 4 guiding sleeve 36 shaft motor 37 outer thread 6 planet gear 38 locking opening 7 spur gear 39 slot 8 adjusting spindle 40 gearwheel 9 assembly flange 41 pivoting drive threaded bores 42 bar 11 guiding surface 12 guiding surface 13 cone 14 inner cone guiding slot 16 connecting rod 17 inner thread 19 plate plate 21 pivoting drive 22 plate 23 plate 24 axis pintail 26 limb 27 slot 28 bearing bore 29 bearing bore inner thread 31 pinion shaft 32 blocking cone
Figure 1 an elevation of the trailer coupling according to the invention, with an axial adjustment into the idle position, Figure 2 a lateral view of the trailer coupling according to the invention and according to Figure 1, Figure 3 a lateral view of a ball-bar according to Figure 1, Figure 4 an elevation of a sleeve for receiving the ball-bar according to Figure 3, Figure 5 a lateral view of the sleeve according to Figure 4, Figure 6 a view according to arrow A in Fig. 5, Figure 7 a lateral view of an alternative embodiment forth with a pivotable ball-bar, Figure 8 a section according to line B-B of Figure 7, through the drive of the ball-bar, Figure 9 a lateral view of a further embodiment form with a laterally pivotable coupling bar, and Figure 10 a plan view of the embodiment form according. to F-figure DETAILED DESCRIPTION OF THE INVENTION
In Figure 1 the adjustable trailer coupling is indicated at 1. It consists essentially of an axially adjustable bar 2 whose 3 outer end carries a ball 3 as well as a guiding sleeve 4, a motor with planet gears 6, a spur gear 7 and an adjusting spindle 8.
The guiding sleeve 4 on both sides carries in each case an assembly flange 9 in which there are incorporated threaded bores 10. The whole trailer coupling 1 is assembled onto a vehicle in that by way of screws it is fastened onto a suitable bracket of the vehicle. With this screws engage into the threaded bores 10.
The bar 2 is accomodated by the guiding sleeve 4. For this purpose the bar 2 comprises a rear guiding surface 11 and a front guiding surface 12 which via a cone 13 blend into a somewhat slimmer bar 2.
Furthermore in the guiding sleeve 4 an annular inner cone 14 is fastened. Finally in the guiding sleeve 4 there are formed guiding slots 15.
On the bar 2 in the rear region there is fastened a pin-like connecting rod 16 which engages into the guiding slot 15.
Furthermore in the bar 2 there is incorporated a pocket hole with an inner thread 17.
The adjusting spindle 8 is screwed into the mentioned inner thread 7 and is rotated by an electrical motor via the-spur gear 7 as well as the planet gear 6. The individual gearwheels of the gear 7 are mounted between lateral plates 19 and 20. The housing of the planet gear 6 and the guiding sleeve 4 are rigidly connected to the plate 20. The adjusting spindle 8 is likewise rotatably mounted in the plates 19 and 20 so that it can be rotated by the electrical motor 5 as desired.
If the motor 5 is driven in the corresponding direction, then the adjusting spindle 8 also rotates.
At the same time the bar 2 which is arranged as a nut on the adjusting spindle 8 and is secured against rotation by the connecting member I6 is pushed outwards . With this axial movement the bar 2 is guided in the guiding sleeve 4 by the guiding surfaces 11 and 12. The bar reaches its end position when the outer cone 13 sits rigidly in the annular inner cone 14.
As long as the guiding slots 15 run in the axial direction, the bar 2 maintains its radial position. After roughly half the adjusting distance the guiding slots 15 blend into a spiral-shaped course. This results in the fact that the bar 2 on extending then correspondingly turns so that the ball 3 in the operating position points vertically upwards. The operating position is shown in Figures 1 and 2 by dashed lines.
For a better understanding the essential parts are again individually shown in Figures 3 to 6.
An alternative embodiment form of a trailer coupling is shown in Figure 7. With this embodiment form the bar 2 is not axially displaced, but is pivoted about an axis 24..
For an easier understanding only the bar 2 with its pivoting drive 21 is shown, wherein known additional drive parts such as a gear motor, are not shown.
Figure 7 shows a pivoting drive 21 with which the bar 2 can be pivoted upwardly about approximately 90°.
The drive however can in a slightly modified form serve for passing through other pivoting angles.
With a correspondingly modified installation location, and an adapted bar 42 for this, a modified pivoting drive 41 may also be applied for a horizontal pivoting of the bar 42. Such a pivoting drive 41 is shown in the Figures 9 and 10.
With the embodiment shown in Figure 7 the bar 2 however is pivoted vertically upwards. For this purpose it is pivotably mounted between two plates 22 and 23 about the axis 24 on the pintail 25.
Furthermore the bar 2 comprises a limb 26 whose function can be seen from Figure 8.
In Figure 8 a section corresponding to the marking effected in Figure 7 is shown. In the region of the limb 26 the bar 2 is thus provided with a slot 27. Furthermore perpendicular to the plane of the slot there is provided a bearing bore 28 for the pintail 25, a bearing bore 29 for a pinion shaft 31 as well as a bore with an inner thread 30 for a blocking cone 32.
As mentioned the pintail 25 is rotatably mountedv' between two plates 22 and 23. In the region of the slot 27 of the bar 2, the pintail 25 comprises a toothing 33. A~gearwheel 34 engages into this toothing 33, the gearwheel being mounted on the~pinion shaft 31. With the gearwheel 34 there meshes a further gearwheel 35 which is connected to a shaft 36 in a rotatably rigid manner.
On the shaft 36 on both sides of the gearwheel 35 there is each mounted a blocking cone 32 in a rotatably rigid but axially displaceable manner. This blocking cone 32 comprises an outer thread 37 which engages into the inner thread 30. For the blocking cone 32 a locking opening 38 is provided in the plates 22 and 23.
In the position shown in Figure 8 the blocking cone 32 should be retracted in the usual manner into the locking opening 28. For a better recognition it is shown in a position in which the bar 2 may be pivoted.
The ends of the pinion shaft 31 are guided in arc-shaped slots 39 of the plates 22 and 23. The remaining bores of the plate 22 shown in Figure 7 serve for its fastening onto the vehicle or serve the fastening of a further gear with a suitable electrical drive or the connection by way of distance bolts.
The position of the bar 2 represented in Figure 7 with dashed lines corresponds to its operating position. For pivoting the bar 2 then, a gearwheel 40 rigidly connected to the pintail 25 is driven. Since firstly the blocking cone 32 is retracted into the locking opening 38 of the plate 23, the bar 2 can still not be pivoted about the axis 24. Instead of this via the toothing 33 and via the gearwheel 34 the gearwheel 35 is rotated.
Since this gearwheel is rigidly connected to the shaft 36, the shaft 36 drives the blocking cone 32. Since the outer thread 37 of the blocking cone is engaged with the inner thread 30, at the same time the blocking cone 32 moves axially inwards until it is completely extended out of the locking opening 38. As soon as the blocking cone 32 comes to bear on the gearwheel 35, the gearwheel 35 and the gearwheel 34 which is engaged with it are blocked. By way of this the pintail 25 drives the blocked gearwheel 34 and the pinion shaft 31, so that the pinion shaft 31 is pivoted about the axis 24. At the same time the pinion shaft 31 which is mounted in the bearing bore 29 of the bar 2 then drives this bar so that the bar 2 is pivoted. This pivoting movement finishes as soon as the pinion shaft 31 reaches the end of the slot 39.
For the purpose of clarity it must be mentioned that in Figure 8 the left blocking cone is not shown.
For the electrical drive it is provided for this to be switched off as soon as the land exceeds a previously set limiting value. In this way damages are avoided, in the case that on moving the bar 2 foreign bodies should inhibit the further operation. So that the adjustment cannot be initiated during the journey of the vehicle it is furthermore provided for the trailer coupling to only be able to be operated outside the compartment of the vehicle. It is particularly advantageous when the operating means, for example a switch, is arranged in the boot of the vehicle .
In this manner there is created a vehicle coupling which is easily and comfortably brought into a position in which it no longer disturbs.
~O
List of reference numerals 1 trailer coupling 33 toothing 2 bar 34 gearwheel 3 ball 35 gearwheel 4 guiding sleeve 36 shaft motor 37 outer thread 6 planet gear 38 locking opening 7 spur gear 39 slot 8 adjusting spindle 40 gearwheel 9 assembly flange 41 pivoting drive threaded bores 42 bar 11 guiding surface 12 guiding surface 13 cone 14 inner cone guiding slot 16 connecting rod 17 inner thread 19 plate plate 21 pivoting drive 22 plate 23 plate 24 axis pintail 26 limb 27 slot 28 bearing bore 29 bearing bore inner thread 31 pinion shaft 32 blocking cone
Claims (20)
1. A trailer coupling for motor vehicles, comprising a towing bar formed so as to be axially displaceable between an inoperative position and an operating position; a spindle and nut drive for displacing said towing bar between said positions, said towing bar being formed as a part of said spindle and nut drive; and a motor with. which said towing bar is connected for displacement of said towing bar, said towing bar being formed so as to he rotatable about its axis.
2. A trailer coupling as defined in claim 1, wherein said towing bar has an axial bore with an internal thread serving as a nut of said spindle and nut drive.
3. A trailer coupling as defined in claim 2, wherein said spindle/nut has a spindle formed as a threaded rod which is located inside said axial bore of said towing bar.
4. A trailer coupling as defined in claim 3, wherein said spindle has a drive motor.
5. A trailer coupling as defined in claim 4, wherein said drive motor is an electric drive motor.
6. A trailer coupling as defined in claim 1, wherein said towing bar is formed so as to lock automatically in said operating position.
7. A trailer coupling as defined in claim 1, and further comprising a link guide for rotation of said towing bar.
8. A trailer coupling as defined in claim 1, and further comprising a coupling piece for an electrical supply of a trailer, said coupling piece being associated with said bar and also being displaceable.
9. A trailer coupling as defined in claim 8, wherein said coupling piece is power-displaceable.
10. A trailer coupling as defined in claim 1, wherein said bar has a drive which is operable via an effective connection and has a switch disposable outside of a passenger cell of a vehicle.
11. A trailer coupling as defined in claim 10, wherein said switch is disposable in a large compartment of the vehicle.
12. A trailer coupling for motor vehicles, comprising a bar which is swivelable between an inoperative position and a locked horizontal operating position; and at least one drive provided for swiveling locking and unlocking motions of said bar, said at least one drive being formed so that it positively locks and unlocks automatically upon swiveling into or out of said operating position, wherein the bar is swivelable from said operating position into said inoperative position upwardly or horizontally by about 90°.
13. A trailer coupling as defined in claim 12, wherein said at least one drive is formed as an electric drive motor.
14. A trailer coupling as defined in claim 12, and further comprising a driving axle on which said bar is rotatably supported, and a pinion shaft which engages into said driving axle and drives said bar.
15. A trailer coupling as defined in claim 12, and further comprising a locking cone displaceably supported in said bar and formed so as to lock said bar automatically in said operating position
16. A trailer coupling as defined in claim 15, wherein said bar has a pinion shaft, and a spindle and nut drive which displaces said locking cone and is formed so as to be drivable by said pinion shaft of said bar via a gearwheel.
17. A trailer coupling as defined in claim 12, and further comprising a coupling piece for an electrical supply of a trailer, said coupling piece being associated with said bar and also being displaceable.
18. A trailer coupling as defined in claim 17, wherein said coupling piece is power-displaceable.
19. A trailer coupling as defined in claim 12, wherein said bar has a drive which is operable via an effective connection and has a switch disposable outside of a passenger cell of a vehicle.
20. A trailer coupling as defined in claim 19, wherein said switch is disposable in a large compartment of the vehicle.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19533670 | 1995-09-13 | ||
| DE19533670.4 | 1995-09-13 | ||
| DE19545620.3 | 1995-12-07 | ||
| DE19545620 | 1995-12-07 | ||
| DE19605570.9 | 1996-02-15 | ||
| DE19605570A DE19605570C2 (en) | 1995-09-13 | 1996-02-15 | Axially adjustable trailer hitch for motor vehicles |
| PCT/EP1996/003850 WO1997010111A1 (en) | 1995-09-13 | 1996-09-03 | Motor vehicle trailer coupling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2231675A1 CA2231675A1 (en) | 1997-03-20 |
| CA2231675C true CA2231675C (en) | 2006-06-13 |
Family
ID=36587396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002231675A Expired - Fee Related CA2231675C (en) | 1995-09-13 | 1996-09-03 | Motor vehicle trailer coupling |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2231675C (en) |
-
1996
- 1996-09-03 CA CA002231675A patent/CA2231675C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2231675A1 (en) | 1997-03-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20140903 |