upwardly due to the counterbalancing effect of springs 33 described previously this can be done readily despite the rather heavy weight of the platform and legs the raising of the beam member 21 and the platform tends to also raise the legs 11 12 13 and 14 since legs 11 and 13 are pivotally connected to the platform and legs 12 and 14 are pivotally connected to legs 11 and 13 when the stand has been raised to the desired height the tubular rod 26 is guided into the appropriate pair of notches 22 on the undersides of beams 18 and 19 the platform is then released and the platform will be securely locked in the desired position due to the angle of inclination of the notches 22 it is possible for the rod 26 to be accidentally moved out of notches 22 in fact the heavier the load on the platform 10 the more firmly will the rod 26 be held in the notches 22 since the legs 11 and 13 are of the same length as legs 12 and 14 the platform will remain level regardless of the height of the adjustment one of the primary functions of the base channel members 15 an 16 is to provide lateral stability for the stand when the platform 10 is in its most elevated position it will be obvious that as the height of the platform 10 is raised the longitudinal spacing between the lower ends.