Retraction means (M, V, 6d) allow the wheelset (6) to be moved in such a way that the trailer (1) rests on the ground (S) selectively either via the main wheelset (3) or via the secondary wheelset (6).

A road trailer (1) according to the invention comprises, under a chassis (2) with fixed draw bar (4), a main wheelset (3) and a secondary wheelset (6).

Orienting the secondary wheelset (6) allows the trailer (1) to be kept always along the axis of the towing vehicle (5) during reversing.

The running gear (1) may be mounted in a pivoting or fixed fashion on a rolling base serving as the chassis of a vehicular or other moving assembly.

Orientation means allow the secondary wheelset (6) to have its direction oriented according to a reversing path followed by a towing vehicle (5) to which the trailer (1) is hitched.

Retraction means (M, V, 6d) allow the wheelset (6) to be moved in such a way that the trailer (1) rests on the ground (S) selectively either via the main wheelset (3) or via the secondary wheelset (6).

A road trailer (1) according to the invention comprises, under a chassis (2) with fixed draw bar (4), a main wheelset (3) and a secondary wheelset (6).

The haulage system (11) also comprises a first hauling apparatus (21a), a second hauling apparatus (21b) and a hauling means (23).

A roller track assembly comprises a first roller track, a second roller track, and a linking roller track, which links the first and second roller tracks.

PROCEDURE TO ASSES THE FLAT TYRE RUNNING MODE OF RUN FLAT SYSTEM

The device has a moving rolling surface which together with a counter-rolling surface forms a rolling channel for rolling the sets, the process of wrapping the joining papers being effected by the same.

The run flat tire can be improved in both of comfortableness in riding and run flat performance.

Disclosed is a rolling device comprising such a rolling head.

Specific Treatments of Ground-roll Segments, including the start-of-roll directivity function ΔSOR

The invention relates to a device in the form of a ground-bound device for take off, landing and taxiing aircraft or flying objects without a landing gear or with a retracted landing gear.