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Wide binaries are tracers of the gravity field of the Galaxy, but their studyrequires some caution. A large list of common proper motion stars selected fromthe AGK3 were monitored with the CORAVEL spectrovelocimeter, in order toprepare a sample of physical binaries with very wide separations. Sixty-sixstars received special attention, since their RV seemed to be variable. Thesestars were monitored over several years in order to derive the elements oftheir spectroscopic orbits. In addition, 10 of them received accurate RVmeasurements from the SOPHIE spectrograph of the T193 telescope at theObservatory of Haute-Provence.  For deriving the orbital elements of double-lined spectroscopic binaries(SB2), a new method was applied, which assumed that the RV of blendedmeasurements are linear combinations of the RV of the components. Thirteen SB2orbits were thus calculated.  The orbital elements were eventually obtained for 52 spectroscopic binaries(SB), two of them making a triple system. Forty SB received their first orbit,and the orbital elements were improved for 10 others. In addition, 11spectroscopic binaries were discovered with very long periods for which theorbital parameters were not found. The median period of the 40 first orbits is1 year, and several SB should be resolved or should receive an astrometricorbit in the future, providing the masses of the components. In addition, itappeared that HD 153252 has a close companion which is a candidate brown dwarfwith a minimum mass of 50 Jupiter masses.  The final selection of the wide binaries and the derivation of theirstatistical properties will be presented in a second paper.

Wide double stars - I. The spectroscopic binaries: Double stars with  wide separations in the AGK3 - I. The components that are themselves  spectroscopic binaries