| 摘要 |
<p>A tree harvesting apparatus consisting of a rigid support with grapple means pivotally supported on the support and tree cutting means for severing the tree that is being grasped by the grapple means. The tree harvesting apparatus also includes an accumulator mechanism consisting of spaced fixed tree engaging elements on the support and a gripping member pivoted on the support between the tree engaging elements. The gripping member includes a first portion pivoted on the support means and a second portion pivoted on the outer end of the first portion with biasing means normally maintaining the portions in end-to-end relation. A single drive member cooperates with the first portion and the support for moving the portions as a unit between clamped and released positions to accumulate trees between the gripping member and the spaced fixed elements. The apparatus also incorporates a hydraulic circuit which is designed so that only two conduits lead from the remote hydraulic source to the rigid support and branch conduits connect the main conduits to the hydraulically actuated gripping member. The branch conduits incorporate a solenoid operated valve which is normally in a position that locates the gripping member in a position where the harvesting apparatus can be utilized without accumulating trees. The solenoid valve is remotely controlled so that the operator may at any time accumulate trees by temporarily activating the solenoid operated valve.</p> |
