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: 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 invention relates to a reinforcing cable for a flexible endless caterpillar track made of an elastomer. The cable (30) comprises a plurality of strands (32C, 32P) each formed from steel filaments and arranged so as to be wound in a helix in the thickness of the belt. Each strand comprises a core composed of at least three filaments (34), an intermediate layer composed of a plurality of filaments (36) and surrounding the core, and an outer layer composed of a plurality of filaments (38) surrounding the intermediate layer. Application to caterpillar tracks for 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: A track drive device for all terrain vehicle comprises a frame (14) able to be mounted on the side of a chassis (C) of a vehicle and carrying two main wheels (38, 42) and support wheels (40A, B, 40E) around which is wound a track (12). The frame (14) comprises a rear part (16) able to be fixed to the chassis (C) of the vehicle and carrying one (38) of the main wheels, and a front part in the form of an approximately horizontal oscillating beam (18) carrying the other main wheel (42) and at least one (40D, 40E) of the support wheels and mounted pivoting about a first transverse pivot (20) located at a lower level. The device also comprises an approximately horizontal suspension arm (52) arranged above the oscillating beam (18), linked to the latter by a connecting rod (64) and mounted pivoting around a second transverse pivot (24) arranged at an upper level approximately at the height of the chassis.

Abstract: The invention concerns a wheel for a flexible track comprising two rolling paths (36) surrounding an intermediate zone (50), in particular a drive zone. At least one of the rolling paths has a multiplicity of cavities (200) of selected form opening radially towards the outside of the wheel and laterally towards the edge of the wheel so as to promote lateral evacuation of any material object liable to be caught between the wheel and the flexible track. The wheel is generally used for all-terrain vehicles.

Abstract: The device comprises at least one track (10) formed from an endless flexible belt (22) fitted on the inside with at least one row of studs (24) situated in the longitudinal direction of the endless belt and spaced at a constant distance apart and each delimited by two transverse faces and two lateral faces, two main wheels (12, 16) and support wheels (20A, 20B, 20C) on which the endless belt rolls, and a guidance element (50) placed between a main wheel (12) and an adjacent support wheel (20C) and comprising rollers (52) able to frame the lateral faces of the studs (24) in order to ensure guidance and stabilization of the endless belt in the region of the guidance element.