Abstract: A vibrating ripper having quadrilateral linkage. The linkage, equipped with a remote hydraulic control therefor for making running adjustments as afforded by a depth actuator cylinder during ripping and possibly, but not necessarily, as afforded by a pitch actuator cylinder which also can be provided, has a raised-carry position and a lowered-rip position in which it has a vibratory rocking action, and defines a pitch axis fixed in the linkage and shifting therewith during depth changes. Strategic upper level placement of an elastic strut connection which is provided, and diagonal placement of the lift or depth cylinder connection to the draft frame or to the ripper beam and shank assembly, locate the pitch axis at the node of the rocking assembly as it vibrates.

Abstract: Arm stress equalizer in tiltable, diagonal strut braced, bulldozer blade mountings, comprising an intervening link having closely adjacent portions of the link proper universally connected to the inner end of different ones of the diagonal struts, and having a prolongation to the link proper rendering the latter swingable toward and from the bulldozer blade. The prolongation is disposed in the central longitudinal plane of the bulldozer, is at the lower end of the link proper, and provides an offset therein which extends diagonally downwardly and forwardly from the struts and the one end of the link proper. The geometry selected insures equalization of side-load-imposed stress in the so-called pusharms provided for mounting the blade, and further insures limitation of stress in the pusharms when, under the special circumstance of an imposed side load condition and a tilted blade condition, the tilt induced stress then tends to be additively superimposed in one of the already side-stressed pusharms.