Abstract: A tree shaker comprising a construction having a front end engaging two arms for gripping a tree; a first shaft having a first weight is rotatably engaged by the construction and is rotated by a first motor a first weight connected to or integrally formed with the first shaft; a second shaft having a second weight is rotatably engaged by the construction and is rotated by a second motor, the first and second shafts being coaxial such that one of them is internally located relative to the other; a stopping mechanism is connected to one of the weights for restricting the relative orientation of the weights to a maximum of 180.degree.

Abstract: A device for the in situ separation of the juice of a juicy fruit, such as a citrus fruit, from the rest of the fruit which includes a grasping mechanism for grasping the citrus fruit and a rotating mechanism for rotating the fruit. The device further includes a piercing member for piercing the fruit. The piercing member includes a mechanism for sweeping the internals of the fruit. In one embodiment, the piercing member has a body and a pivotable member which is pivotably connected to the body. The pivotable member is pivotable about a pivot point so as to move within the citrus fruit as the citrus fruit is rotated to thereby bring about the separation of the juice of the citrus fruit from the rest of the citrus fruit through centrifugal force. Finally, the device has a mechanism for pivoting the pivotable member about the pivot point. In another embodiment, the piercing member includes a blade which may be bent to sweep out the internals of the fruit.

Abstract: A hydraulic tool, such as might be used to prune trees, for alternately producing a relatively strong power stroke and a relatively weak reset stroke, which includes a reciprocating member within a housing and a hydraulic system made up of two chambers. The first chamber has an effective projected area relative to the reciprocating member and is hydraulically connected to the outlet. The second chamber has an effective projected area relative to the reciprocating member which is smaller than that of the first chamber. The second chamber is hydraulically connected to the inlet only during the power stroke, and is hydraulically connected to the first chamber only during the reset stroke and during the time between the end of the reset stroke and the beginning of the next power stroke.