Abstract: A torsion suspension assembly comprises a first housing and a first biasing body within the first housing, a second housing and at least a second biasing body within the second housing. A shaft has a first end supporting a suspension arm adapted to support a wheel or wheel assembly, an elongated body of the shaft operatively within both the first biasing body and the second biasing body. A preconstraining arrangement is provided such that the shaft is in an equilibrium condition when the first biasing body and the second biasing body apply opposite torsion forces on the shaft.

Abstract: A torsion suspension assembly comprises a first housing and a first biasing body within the first housing, a second housing and at least a second biasing body within the second housing. A shaft has a first end supporting a suspension arm adapted to support a wheel or wheel assembly, an elongated body of the shaft operatively within both the first biasing body and the second biasing body. A preconstraining arrangement is provided such that the shaft is in an equilibrium condition when the first biasing body and the second biasing body apply opposite torsion forces on the shaft.

Abstract: The extension ramp is suitable for use with a car ramp having a raised platform portion for supporting a car wheel and a downwardly elongated sloped portion connected thereto, the sloped portion having a given inclination with respect to the platform portion. The extension ramp comprises a substantially elongated straight portion having a free end mountable along the sloped portion of the car ramp and a slanted portion connected to a second end of the straight portion and forming an obtuse angle with the straight portion. The slanted and straight portions are defining together a passage for a car wheel and the slanted portion has a free end for laying on the ground and for receiving the car wheel. The free end of the straight portion is securable along the sloped portion of the car ramp, whereby the extension ramp is mountable on the car ramp for lowering the inclination of the sloped portion of the car ramp.

Abstract: A method which determines output parameters (such as porosity .phi. or water saturation S.sub.w of formations) from a set of logging measurements taken at each level of a borehole is proposed.Measurement and response equation uncertainties of each logging apparatus are determined at each measurement level. Assumed values of the output parameters are chosen and, applying the response equations, calculated values of the measurements are determined. The calculated values of the measurements and the actual measurements are then compared to determine deviations which are weighted by factors calculated from the previously determined uncertainties. An incoherence function is determined from the weighted deviations and a number of "a-priori" constraints. Minimization of the incoherence function gives the most probable output parameters whose uncertainty is in turn calculated.