Jib cranes.-In an apparatus for extracting tree stumps, a jib 18 pivotally mounted on a tractor is supported during the pulling operation by a pair of legs or rods 32 having means for engaging the ground and for pivotally connecting them to the jib head 26. When disengaged from the ...
An apparatus for single-handed operation in skidding logs, stumps, poles and the like. An A-frame with rearwardly-extending beam is attached to the three-point hitch of a tractor. A fluid-operated grapple, which will inherently adjust to... J Rentschler - US 被引量: 23发表: 1991年 ...
7. The pulling device of claim 1 wherein said support structure is provided with a linkage means adapted for cooperative engagement with a corresponding three point hitch of a tractor coupling said device to said tractor. 8. A pulling device suitable for the removal of ground embedded structure...