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In a traditional hitched trailer there is no way to adjust the ride height of the trailer. Provided is an angular adjusting mechanism (13) for a suspension system (10) comprising a shaft (12) and a crank arm (20), the shaft (12) having a connecting end (14) connected to the crank arm (20), said angu

In a traditional hitched trailer there is no way to adjust the ride height of the trailer. Provided is an angular adjusting mechanism (13) for a suspension system (10) comprising a shaft (12) and a crank arm (20), the shaft (12) having a connecting end (14) connected to the crank arm (20), said angular adjusting mechanism (13) comprising a frusto-comcal shaped surface (16) provided on the connecting end (14) and pointing outwardly from said shaft (12), said surface (16) having an array of first cavities (18) arranged circumferentially, a frusto-comcal bore (22) proximate a first extremity of said crank arm (20), said bore (22) having an array of second cavities (24), said bore (22) being operative to mate with said surface (16) of said connecting end (14), and an interlocking element (30) partly positioned in one of said second cavities (24) and partly positioned in one of said first cavities (18) so as to lock said crank arm (20) at a predetermined angular position with respect to said shaft (12). Also, an improved torsion suspension system (10) including the above mentioned angular adjusting mechanism (13) is provided.

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1. An angular adjusting mechanism for a suspension system comprising a shaft and a crank arm, the shaft having a connecting end connected to the crank arm, said angular adjusting mechanism comprising: a frusto-conical shaped surface provided on the connecting end and pointing outwardly from said sha

1. An angular adjusting mechanism for a suspension system comprising a shaft and a crank arm, the shaft having a connecting end connected to the crank arm, said angular adjusting mechanism comprising: a frusto-conical shaped surface provided on the connecting end and pointing outwardly from said shaft, said surface having an array of first cavities arranged circumferentially;a frusto-conical bore proximate a first extremity of said crank arm, said bore having an array of second cavities, said bore being operative to mate with said surface of said connecting end; andan interlocking element partly positioned in one of said second cavities and partly positioned in one of said first cavities so as to lock said crank arm at a predetermined angular position with respect to said shaft. 2. The angular adjusting mechanism of claim 1, wherein the connecting end further comprises a screw for connecting said crank arm to said connecting end. 3. The angular adjusting mechanism of claim 2, wherein said crank arm further comprises an axle proximate a second extremity of said crank arm, said axle being parallel to said shaft. 4. The angular adjusting mechanism of claim 1, wherein the interlocking element is tightly enclosed within a volume defined by one cavity of the first array of cavities and the cavity of the second array of cavities. 5. A torsion suspension system comprising: a shaft having two opposed connecting ends, each one of said connecting ends having a frusto-conical shaped interface surface pointing outwardly from said shaft, said interface surface having an array of first cavities arranged circumferentially;a pair of angular adjusting mechanisms, each one of said pair of angular adjusting mechanisms being located at a respective connecting end, each said angular adjusting mechanism having: a crank arm, said crank arm having a frusto-conical bore proximate a first extremity of said crank arm, said bore having a second cavity, said bore being operative to mate with said interface surface of said connecting end; andan interlocking element, said interlocking element being partly positioned in said second cavity and partly positioned in one cavity of said array of said first cavities so as to lock said crank arm at a predetermined angular position with respect to said shaft. 6. The torsion suspension system of claim 5, wherein each one of said connecting ends further comprises a screw for attaching said crank arm to said connecting end. 7. The torsion suspension system of claim 6, wherein said crank arm further comprises an axle proximate a second extremity of said crank arm, said axle being parallel to said shaft. 8. The torsion suspension system of claim 5, wherein the interlocking element is tightly enclosed within a volume defined by one cavity of the first array of cavities and the second cavity which is part of a second array of cavities. 9. A torsion suspension system comprising: a shaft having two opposed connecting ends;two crank arms operatively connected to a different one of said connecting ends;an angular adjusting mechanism at each of said connecting ends, said angular adjusting mechanism being operative to angularly adjust an angle of each of said two crank arms with respect to said shaft, said angular adjusting mechanism being as defined in claim 1. 10. The torsion suspension system of claim 9, wherein each one of said connecting ends further comprises a screw for attaching said crank arm to said connecting end. 11. The torsion suspension system of claim 9, wherein said crank arm further comprises an axle proximate a second extremity of said crank arm, said axle being parallel to said shaft. 12. The torsion suspension system of claim 9, wherein the interlocking element is tightly enclosed within a volume defined by one cavity of the first array of cavities and by one cavity of said second array of cavities. 13. A trailer for being hauled by a vehicle, the trailer comprising a body; and a torsion suspension system as defined in claim 5. 14. A strap or belt assembly, comprising a strap or a belt mounted on supporting rotationary members, and a tensioning device for tensioning said strap or belt on said rotationary members, said tensioning device comprising a torsion suspension system as defined in claim 5. 15. A torsion system comprising: a housing adapted to be secured to a structural portion of a vehicle;a shaft having a core portion accommodated in the housing and defining at least one concavity in the core portion, the shaft having a connecting end connected to a crank arm, the connecting end protruding out of the housing;at least one elastomeric member having a geometry so as to at least partially fill the concavity and contact an inner surface of the housing, the rotation of the crank arm resulting in a deformation of the elastomeric member; andan angular adjusting mechanism comprising: a frusto-conical shaped interface surface provided on the connecting end and pointing outwardly from said shaft, said interface surface having an array of first cavities arranged circumferentially;a frusto-conical bore proximate a first extremity of said crank arm, said bore having an array of second cavities, said bore being operative to mate with said interface surface of said connecting end; andan interlocking element partly positioned in one of said second cavities and partly positioned in one of said first cavities so as to lock said crank arm at a predetermined angular position with respect to said shaft. 16. The torsion suspension system of claim 15, wherein the core portion has a cross-shaped section with four of said concavities, each of said concavities being defined by adjacent walls that form an obtuse angle to each other. 17. The torsion suspension system of claim 16, wherein each intersection of adjacent walls may be rounded. 18. The torsion suspension system of claim 15, wherein the elastomeric members for each of the four concavities are an elongated member of generally trapezoidal cross-section having obtuse angle to fit with corresponding adjacent walls of a corresponding concavity of the core portion. 19. The torsion suspension system of claim 18, wherein each intersection of adjacent walls of the member may be rounded. 20. The torsion suspension system of claim 15, wherein the shaft has a pair of supported surfaces at opposed ends of the core portion, each of these supported surfaces being adjacent to flanges and forming a groove, the intersection of each of these supported surfaces with the flanges being rounded. 21. The torsion suspension system of claim 20, further comprising support blocks operatively supporting the supported surfaces in the housing such that the shaft is rotatable about its longitudinal axis, each support block having an opening that is shaped to correspond with a corresponding portion of the groove defined by the supported surfaces and the flanges and maintaining the shaft captive within the housing. 22. A torsion suspension system comprising: a housing adapted to be secured to a structural portion of a vehicle;a shaft having a core portion accommodated in the housing and defining at least one concavity in the core portion, the shaft having a connecting end connected to a crank arm, the connecting end protruding out of the housing;at least one elastomeric member having a geometry so as to at least partially fill the concavity and contact an inner surface of the housing, the rotation of the crank arm resulting in a deformation of the elastomeric member; andan angular adjusting mechanism provided at each end of the shaft, each angular adjusting mechanism comprising: a frusto-conical shaped interface surface provided on the connecting end and pointing outwardly from said shaft, said interface surface having an array of first cavities arranged circumferentially;a frusto-conical bore proximate a first extremity of said crank arm, said bore having an array of second cavities, said bore being operative to mate with said interface surface of said connecting end; andan interlocking element partly positioned in one of said second cavities and partly positioned in one of said first cavities so as to lock said crank arm at a predetermined angular position with respect to said shaft. 23. The torsion suspension system of claim 22, wherein the core portion has a cross-shaped section with four of said concavities, each of said cavities being defined by adjacent walls that form an obtuse angle to each other. 24. The torsion suspension system of claim 23, wherein each intersection of adjacent walls is rounded. 25. The torsion suspension system of claim 22, wherein the elastomeric members for each of the four concavities are an elongated member of generally trapezoidal cross-section having an obtuse angle to fit with corresponding adjacent walls of a corresponding concavity of the core portion. 26. The torsion suspension system of claim 25, wherein each intersection of adjacent walls of the member is rounded. 27. The torsion suspension system of claim 22, wherein the shaft has a pair of supported surfaces at opposed ends of the core portion, each of these supported surfaces being adjacent to flanges and forming a groove, the intersection of each of these supported surfaces with the flanges being rounded. 28. The torsion suspension system of claim 27, further comprising support blocks operatively supporting the supported surfaces in the housing such that the shaft is rotatable about a longitudinal axis, each support block having an opening that is shaped to correspond with a corresponding portion of the groove defined by the supported surfaces and the flanges and maintaining the shaft captive within the housing.