Bulldozer frame with arm stress equalizer

In a dozer blade frame including a pair of longitudinally extending and laterally spaced apart pusharms pivotally connected at the front end to the rear of the blade so as to define a generally horizontal blade pitch axis, a pair of diagonal struts connected to and extending forwardly from the pusharms inner sides toward one another with their inner ends terminating in mutual adjacency and adjacent the central rear of said blade, an interconnecting link disposed generally at an acute vertical angle for attachment between the diagonal struts and blade, and a pair of adjustable braces extending upwardly between the pusharm tops and the blade, each adjustable brace hydraulically responsive to be set simultaneously in the same motion of adjustment or in the opposite motion or at rest, when the other is set in motion of adjustment, respectively, to change the pitch angle or to change the tilt angle of the blade, the improvement effecting an equalization/limiting function in pusharm stressing characterized by having:

• first, said link pivotally connected at a generally upstanding free end thereof to said inner ends of the diagonal struts whereby to move therewith to and fro relative to the blade without attendant disturbance necessarily of the pitch angle of the latter;
• and
• second, said link pivotally connected at a secured lower end thereof to the central rear of said blade on a horizontal pivot axis essentially concentric with said blade pitch axis whereby the blade pitches to and fro relative to the link without disturbing the acute vertical angle of the latter.