32a the resulting forces generated from the rotation of the unbalanced weights produce the desired helical vibratory motion of elevator 10 to better visualize the relative positioning of the eccentric weights on the shafts and forces produced reference is made to the schematic diagrams of fig2 and 4 which depict rotation of shafts 28 30 32 through three phases 90 u00b0 apart the dashed vectors represent forces generated by weights at one end of the shafts and while the solid vectors depict the forces generated by the weights positioned at the other end looking at an end view of the shafts the dotted vectors represent the weights at the remote ends because the masses on shaft 30 are twice as large as those on shafts 28 or 32 and shaft rotation is essentially at the same angular speed the vectors depicting the force vector generated by the weights on shaft 30 are twice as long as those vectors representing forces generated by the weights on shafts 28 or 32 the horizontal components in fig2 b 3b 4b are depicted by the dots and an 34 x 34 inscribed inside the circles the dots represent the force vector directed out of the paper while the 34 x 34 represents a force vector directed into the paper the weights on one end of each shaft may be positioned as illustrated at a 90 u00b0 angle with respect to the weight on the other end it should be noted that while it is necessary that the weights have the same angle with respect to the.