A tree shaker has a carriage for movement in an orchard into a special position with respect to a tree to be shaken. On the carriage is a four-bar linkage supporting a platform for movement about the tree in an arcuate horizontal path with the platform directed toward the tree trunk and at various radial distances therefrom. The tree shaker unit is supported on and at selected heights above the platform by a torsion bar suspension having linkage so that the tree shaker unit is pendulous below the point of support on the platform. The tree shaker unit is driven with shaking strokes of various predetermined lengths by a crank pin moved at any time and locked in any of several positions at different radii from the rotational axis of the crank.
A portable device for shaking the branches of trees to dislodge fruits or nuts, has a drive motor which is coupled to a reciprocatable rod through a gear transmission including a centrifical clutch and a linkage including a ball and socket joint incorporating a needle bearing, a hook shaped member on an extension rod being detachably attachable to the reciprocatable rod.
