Hydraulically controlled articulated chain saw mounting arm structure

Claim 1

In combination, a mobile base, a turntable supported from said base for oscillation about a first upstanding axis, a first boom having one end thereof supported from said turntable for oscillation about a second horizontal axis extending transversely of said first boom between a generally horizontal position and an upstanding position with the other end of said first boom disposed uppermost, a second boom having one end thereof pivotally secured to the other end of said first boom for oscillation about a third horizontal axis extending transversely of said booms, a generally horizontal elongated arm structure including first and second elongated end portions, the first end of said first end portion being mounted on the other end of said second boom for oscillation about a fourth axis generally paralleling the second and third axes, a first end of said second portion being pivotally secured to the second end of said first end portion about a fifth axis generally normal to said fourth axis and the longitudinal center line of said arm structure when said first and second end portions thereof are aligned, an elongated support having one end journaled from said second end portion for oscillation about a sixth axis generally coinciding with the center line of said arm structure when said first and second end portions are aligned, a tool mounting bracket, means journaling said tool mounting bracket from the other end of said support for oscillation about a seventh axis disposed generally normal to said sixth axis, six motor means operatively associated with the relatively movable components at said sixth axes for causing adjustable oscillation therebetween, said motor means operatively associated with said fifth and sixth axes being disposed above a transverse plan containing the longitudinal center line of said arm structure.