Load holder for mounting on a vehicle
The present invention concerns a load holder for mounting on a vehicle, where the vehicle is fitted with a ball-shaped towing hook or towing ball for attaching a trailer or similar, and where the load holder has gripping devices which are brought into contact with the towing ball
Load holders of this type have been developed particularly in order to be able to transport equipment such as bicycles skis, windsurfers, etc , in which connection the vehicle's towing ball is used to mount the load holder Consequently, a standard load holder can be used for a number of different vehicles which have a towing ball fitted
A cycle holder is known the principle of which consists of two arms which are linked in rotating fashion by means of an articulated shaft The lower ends of the arms are equipped with a ring which is designed to grip on opposite sides of the towing ball On the other side of the articulated shaft, the arms are mutually attached to a clamping device designed to force the arms apart, which causes the rings to clamp around the towing ball The upper ends of the arms can be attached to folding, horizontal support arms from which the bicycle is suspended
One disadvantage of the above bicycle holder is that relatively great manual force is required to achieve a sufficient clamping force around the towing ball and there may be a certain risk of fingers being caught during the tightening process Another disadvantage is that in many cases the bicycle holder must be completely removed from the vehicle if it is necessary to have access to the rear of the vehicle such as the rear hatch or boot lid
US 4,412,635 shows a load holder for mounting on a vehicle, where the vehicle has a towing ball mounted on a bar or shank which is, in turn, fastened to a plate-shaped base The load holder comprises a support element which has a lower, fork-shaped plate The fork-shaped plate is forced into contact between the base and the lower part of the ball by means of a press device which presses against the ball at one end and which is fastened to the support element at the other end However, this solution requires that the towing ball
extends up above a base or that the bar of the towing ball is designed with a flange or equivalent and it will not, therefore, be possible to use this solution directly on towing balls which have a flat bar
DE 44 29 788 shows a device for fastening a platform to a towing ball on a vehicle The device comprises a lower fork-shaped part which interacts with an upper part designed to grip the upper part of the ball The lower and upper parts are fastened together and to the ball by means of screws A housing attached to the platform can be fastened to the fastening device by means of a fastening mechanism which also allows the platform to be tipped backwards One disadvantage of this solution is that tools are required to remove/mount the fastening device The solution also comprises screws which are screwed in place in the towing ball, which involves adaptation work/costs and the towing ball may be weakened or not very suitable for other use on account of the holes drilled in it
With the present invention, a load holder for vehicles has been arrived at with which the above disadvantages can be avoided and which demonstrates good load-carrying capacity and high stability
The present invention will now be described in further detail with reference to examples and the enclosed drawings, where
Fig 1 shows a load holder in accordance with the present invention, seen from the rear,
Fig 2 shows a load holder in accordance with the present invention, seen from above,
Fig 3 shows a vertical partial section of the load holder mounted on a towing ball,
Fig 4 shows an A-A section in Fig 3,
Fig 5 shows a B-B section in Fig 3
Figure 1 shows a load holder 1 from the rear, onto which can be mounted a light 2 and a number plate 3 The load holder may comprise vertical uprights (not shown) to support the load
Figure 2 shows a load holder 1 from above, on which a beam 4 supports an element for supporting a load 5, here a load board is shown The element for supporting a load 5 comprises, in this example, frame parts 6, 7 and 8,9 which are fastened at one end to the
beam 4. The outward-facing parts of the frame parts support, in pairs, support elements for a load 10, 11 , 12 and 13. If the element for supporting a load is specially adapted for the transportation of bicycles, the support elements can have a V-shaped or U-shaped cross-section to support the wheels of the bicycles.
Figure 3 shows a vertical section through a beam 4. The beam is hollow and is preferably made from an extruded aluminium section. Two gripping devices are mounted in the cavity of the beam 4. The gripping devices grip the towing ball 22. The towing ball should preferably be mounted on the back of a vehicle for towing a trailer, etc., but the towing ball may also be mounted in other locations, for example on the shaft of a camping trailer. In the figure the right gripping device 20 is stationary while the left gripping device 21 is mounted in the beam 4 so as to slide in such a way that it can be moved to come into contact with the ball 22 using a clamping device 19. The clamping device comprises a power arm 23 which is mounted in the beam 4 by means of a hinge bolt 25 so that when the handle 24 is pressed downwards, the gripping device 21 is moved to come into contact with the ball and the ball is brought into contact with the gripping device 20. In order to ensure a positive return movement of the gripping device 21 , a carrier 26 is arranged so that it guides the gripping device away from the towing ball when the handle 24 is raised. Alternatively, the gripping device 20 may also be mounted in the beam 4 so as to be movable like the gripping device 21. Such mounting would comprise a clamping device as stated in connection with the gripping device 21.
The handle 24 can be locked in a continuously adjustable position using a locking device 27. The locking device (see also fig. 5) may comprise an eye bolt 28 which, at its lower end, is fastened to the beam 4 by means of a pin 32 and which, at the other end, comprises a threaded part which interacts with a wing nut 29. The wing nut 29 is designed to move in/down a stopper 31 which is mounted so as to slide on the eye bolt. A hair spring (not shown) may be mounted on the outside of the bolt between the eye and the stopper so that the stopper moves with the wing nut when the latter is screwed out/up. The stopper may be designed with a hook so as to achieve a secure grip on the handle 24. Preferably, a friction-reducing element 30 is mounted between the wing nut 29 and the stopper 31. The gripping surfaces 51 , 52 of the gripping devices 20, 21 (see fig. 3) are shaped to match the surface of the towing ball. Preferably, the gripping devices are equipped with a mainly spherical recess but other geometries which produce a good grip against the towing hook in
question may also be used For example, surfaces which produce a line contact (circular contact faces or rings) or point contact may be used In the latter case, the gripping devices may be provided with bulbs (not shown) so that the contact pressure between the gripping devices and the towing hook can be increased
In the example shown, the gripping devices have a mainly circular cross-section and are mounted in the beam 4 by means of profile elements which constitute parts of a cylinder surface The present invention is not limited to this cross-section shape, other cross-section shapes such as square, polygonal, oval, etc can also be used for the purpose in question In this case, the beam's internal profiles for support are adapted to the cross-section shape in question
The beam 4 is supported against rotation around the vehicle's longitudinal axis (normal to the paper plane) by the gripping devices 20, 21 being designed with collars 33, 34 which support against the shank 35 of the towing ball
The beam is also supported against rotation around a transverse axis to the vehicle by means of a movable fork plate 36 which has a U-shaped recess, the internal side edges of the plate can be brought into contact with the opposite sides of the shank 35 The fork plate is mounted in the beam 4 to be movable by means of guides 37 and can be moved by means of a power arm 38 The power arm is mounted so that it can rotate by means of a pin 40 and also has a handle 39 The handle can be locked by means of a locking system designed in the same way as the previously mentioned locking device 27 for the gripping devices The power arm 38 has an outer part which interacts with a hole 42 in the fork plate 36 so that, when the handle is moved down, the locking plate 36 is brought into contact with the shank 35 When the handle 39 is moved up, the fork plate will be pulled away from the shank 35
The frame parts 6, 7, 8 and 9 may be made of tubing, preferably of aluminium The ends of the frame parts are held in place between profiles in the beam 4 and in the example they have an oval shape at their ends which allows good transmission of the moments from the load board to the beam 4
When the load holder is mounted, handles 24 and 39 are lifted to an upward position This causes the gripping device 21 to move to a withdrawn position Similarly, the fork plate 36 will also be in a withdrawn position The beam is designed with an opening in the base so that it can be threaded down over the towing ball The ball is allowed to pass by the withdrawn fork plate and the withdrawn gripping device and assumes a position directly above the stationary gripping device 20 Then the handle 24 is moved down so that the gripping device 21 is brought into contact with the ball 22 and the ball is thus held in place between the gripping devices The stopper 31 is brought into a position so that it grips across the handle and locks it This system may be tightened by tightening the wing nut 29 Then the handle 39 is moved down so that the fork plate encloses the shank 35 The handle 39 is locked in the same way as stated above by means of the locking device 41 As the handles 24 and 39 are located a little above the towing ball in terms of height, the handles 24 and 39 and the locking device 27 will be easy to operate with sufficient force
If it is necessary to have access to the rear part of the vehicle, for example the boot lid or rear hatch, the load holder can be swung down This is done by lifting the handle 39 so that the fork plate 36 is moved away from the shank 35 and the gripping device 21 is loosened slightly The latter can be done by screwing the wing nut 29 up The collars 33, 34 on the gripping devices 21 , 20 are expediently designed (see fig 4) so that the beam and thus the load holder can be swung down This is made possible by the collars 33, 34 being designed with recesses 50 in their rear edges These recesses run along the periphery of the gripping devices for as long as is sufficient to allow the load holder to be swung down and possibly brought into contact with the base (the ground) at its outer, rear end In this swung-down position, the weight of the load holder, which may also include a load, is distributed between the towing ball and the base