additionally the elongated arms 46 have hinges 52 at approximately their midpoints to permit folding or collapsing of the arms onto one another for storage on top of the frame plate 14 as shown in fig3 a clamp 53 maintains the arms in their open position when the handle 44 is folded and placed on the base plate 14 the pins 47 can be reinserted through holes 55 midway along the length of the lower arms 46 a pair of connector braces 54 are secured between the respective portions of the elongated arms and serve to add rigidity and strength to the handle 44 a top cross bar generally designated 58 is secured at the upper free end of the handle 44 for manual grasping by the user the cross bar 58 includes an inner threaded shaft 60 which is enclosed by a rotatable metal sleeve 62 an outer three part rubber sleeve 64a 64c is wrapped about the metal sleeve 62 and facilitates absorbing some of the vibrations from the motor 38 a support leg structure generally designated 68 is pivotally mounted by a shaft 70 between the elongated arms 46 to support the handle 44 at the desired angle for the user as shown in fig2 the leg structure 68 includes a pair of cross braces 72 which are connected to the shaft 70 by a pair of vertical end.