Abstract: This tyre (14) is of the semi-hollow type for agricultural machinery, notably for a machine comprising a roller provided with a series of tyres mounted on a horizontal tube (12). Each tyre comprises a central sleeve (26) and at least one tread portion with a dome shaped profile comprising a tread (24) connected to the sleeve (26) by two sidewalls (28, 30) so as to define a hollow annular space (32) of reduced cross section relative to the cross section of the dome shaped profile. It further comprises a plurality of peripheral grippers (34) formed to project from the tread (24) and distributed in the circumferential direction on the top of the dome shaped profile. Alternatively, the tyre may be fitted to an individual wheel.

Abstract: The machine comprises a given number of roller pairs respectively connected to the machine frame by a linking part (32). The linking part (32) of each roller pair is adapted so as to enable the rollers (12a, 12b) to incline freely about a first roll axis (YY?) perpendicular to and coplanar with the longitudinal axis (XX?) of the rollers and about a second axis (HH?) parallel to the pitch axis of the frame (10), no matter what deformations of the road or terrain are encountered. Application in particular to seed drills for agricultural machines.

Abstract: An endless flexible belt track produced from an elastomer comprises a steel cable (30) spirally wound in the thickness of the belt (12) and outer layers embedded in the thickness of the belt and formed successively from the turns (34) of the cable toward the outside, by: a first oblique layer (36) formed from wires that in turn form a first acute angle (A) to a perpendicular to the turns of the cable; a transversal layer (38) formed from wires that in turn form a right angle to the turns of the cable; and a second oblique layer (40) formed from wires that in turn form a second acute angle (B) to a perpendicular to the turns of the cable, the second acute angle (B) extending in the opposite direction to the first acute angle (A). Application to all-terrain vehicles.

Abstract: The drive device of the invention comprises a ready to fit unit or kit, for installing in a detachable manner on one side of a chassis of a motor vehicle. The unit comprises a flexible crawler looped round a drive wheel adapted to be mounted on a drive hub of the vehicle and round a tension wheel carried by a support frame, which comprises an internal part adapted to be secured in a detachable manner on the chassis remote from the drive shaft, an intermediate part adapted to carry the tension wheel and an external part carrying a bearing for the drive wheel. The invention is particularly of use for transforming vehicles with four drive wheels for crawler operation.

Abstract: The machine comprises a given number of roller pairs respectively connected to the machine frame by a linking part (32). The linking part (32) of each roller pair is adapted so as to enable the rollers (12a, 12b) to incline freely about a first roll axis (YY?) perpendicular to and coplanar with the longitudinal axis (XX?) of the rollers and about a second axis (HH?) parallel to the pitch axis of the frame (10), no matter what deformations of the road or terrain are encountered. Application in particular to seed drills for agricultural machines.

Abstract: An endless flexible belt track produced from an elastomer comprises a steel cable (30) spirally wound in the thickness of the belt (12) and outer layers embedded in the thickness of the belt and formed successively from the turns (34) of the cable toward the outside, by: a first oblique layer (36) formed from wires that in turn form a first acute angle (A) to a perpendicular to the turns of the cable; a transversal layer (38) formed from wires that in turn form a right angle to the turns of the cable; and a second oblique layer (40) formed from wires that in turn form a second acute angle (B) to a perpendicular to the turns of the cable, the second acute angle (B) extending in the opposite direction to the first acute angle (A). Application to all-terrain vehicles.

Abstract: The drive device of the invention comprises a ready to fit unit or kit, for installing in a detachable manner on one side of a chassis of a motor vehicle. The unit comprises a flexible crawler looped round a drive wheel adapted to be mounted on a drive hub of the vehicle and round a tension wheel carried by a support frame, which comprises an internal part adapted to be secured in a detachable manner on the chassis remote from the drive shaft, an intermediate part adapted to carry the tension wheel and an external part carrying a bearing for the drive wheel. The invention is particularly of use for transforming vehicles with four drive wheels for crawler operation.