SE445726B - DEVICE FOR MIDDLEXED VEHICLES - Google Patents

Description

8403451-1 ;.

The embodiment shows a truck vehicle intended for transporting goods in warehouses between shelves in a high warehouse. The vehicle is articulated and comprises a front and a rear section 11, 12 which are connected to a vertical hinge connection 13. The vehicle is controlled in a conventional manner by means of two hydraulic cylinders 14 which can rotate the sections about the axis of rotation through the hinge connection 13. On the front section 11, a stand 15 is mounted which supports a vertically displaceable lifting table 16 equipped with telescopically extendable lifting forks intended for supporting pallets etc. The front section 11 is supported on the surface of the truck 18 by means of two pairs of wheels 19, 20 arranged in a bogie design, while the rear section 12 is supported by an ordinary pair of wheels 21. Auxiliary wheels 22, 23 are mounted on the chassis of each section. of hydraulic jacks 24 can be raised and lowered relative to the ground 18. The auxiliary wheels 22, 23 are submersible to a level below the ordinary wheels 19, 20, 21 so that the respective auxiliary wheels can support the associated section. If the truck is steered manually, a driver's seat (not shown) may be fitted on the rear section. Furthermore, the truck is suitably equipped with control devices (not shown) by means of which the ordinary wheels are braked when a jack 24 starts the lowering of an auxiliary wheel.

Alternatively, the brakes can also be applied manually by the driver.

The auxiliary wheels 22, 23 are arranged to rotate about pivot axes 25 which intersect the vertical pivot axis through the hinge connection 13.

This avoids that the auxiliary wheels are exposed to lateral forces.

When a vehicle of the above type is to pass through a narrow passage, for example if the vehicle is to be driven into a storage aisle that runs at a right angle to the direction of travel, the front section of the vehicle is first turned into the aisle. If the vehicle were now to continue to drive into the aisle in a conventional manner, the rear section of the vehicle would collide with the corner of one of the pallet racks on both sides of the aisle. Therefore, the truck stops when it has reached halfway into the gangs, after which the jack on the rear section pushes the auxiliary wheel 23 against the ground 18 so that this section will only rest on f * 8405451-1. this auxiliary wheel. By subsequently turning the steering wheel or the like, the hydraulic cylinders 14 will be activated and pivot the rear section about the axis of rotation through the hinge connection 13, the auxiliary wheel 23 rolling supporting the section. When the section has been turned sufficiently, the auxiliary wheel 23 can be raised again and the truck can be driven forward in the usual manner. In the case of very narrow passages: the sections can be alternately lifted on the respective auxiliary wheels and driven forward in between. However, the main reason for equipping both sections with auxiliary wheels is that the truck is driven in the opposite direction out of the storage aisle, whereby the rear section 12 can be swiveled in the normal way while the front section must be lifted onto the auxiliary wheels 22.

To ensure that the section that is not lifted stands still on the ground while the other section is rolled sideways on the auxiliary wheels, the ordinary wheels on this section must be braked, which as mentioned is convenient by automatically engaging the brakes when any auxiliary wheel is lowered. However, this is not necessary if the stationary section is supported by two pairs of wheels such as the front section 11, so in this case it would not be necessary to brake the pair of wheels 19, 20 when the rear section is turned.

The invention is of course not limited to the embodiment shown but can be varied in many ways within the scope of the following claims.

Claims (1)

A device for articulated vehicles, preferably industrial trucks comprising a front and a rear section (11, 12) which are articulated to each other and each supported by at least one pair of wheels (19,20,21), can be characterized in that a free-rolling auxiliary wheel (22, 23) substantially transversely to the ordinary wheels is mounted on each of the sections (11, 12) and that lifting means (24) are arranged to provide a relative raising and lowering movement. between the respective (T9,20,21) so that (18) the raised position of the auxiliary wheels (22,23) and the ordinary wheels the latter can assume one from the truck's base and the auxiliary wheel (22,23) rolling support this section when the truck's guide means (14 ) is activated. Device according to claim 1, characterized in that the rotating shaft (25) of the auxiliary wheel intersects the rotating shaft through the hinge connection (13) between the sections (11,12). Device according to claim 1 or 2, characterized in that control means are arranged for braking the ordinary wheels (19,20,21) when the lifting means (24) start said relative movement between these wheels and the auxiliary wheel (22,23). Device according to one of the preceding claims, characterized in that at least one of the sections of the vehicle is supported by two ordinary pairs of wheels (19,20).