Plow trip mechanism

Claim 2

A self-restoring plow trip comprising a supporting frame, a moldboard plow attached to a stub beam, a pair of vertically spaced solid links pivotally connected at their forward ends to said supporting frame and at their rear ends to said stub beam, biasing means connected between one of said links and said frame for biasing said stub beam into plowing position, in all positions of said plow said pivotal connection of the lower of said links and said frame being positioned forwardly of the pivotal connection of the upper of said links with said frame and said pivotal connection of said lower link and said stub beam being positioned rearwardly of the pivotal connection of said upper link with said stub beam whereby when said plow strikes an object said plow will move rearwardly and upwardly without the point of said plow striking the bottom of said plow furrow, one of said links is provided with a stop member coacting with said stub beam for limiting the forward movement of said plow under the influence of said biasing means.

Claim 3

A self-restoring plow trip as recited in claim 1 and wherein said upper link is provided with a hook portion coactable with a member inserted through an opening in said stub beam for retaining said plow in tripped position.

Claim 4

A self-restoring plow trip comprising a supporting frame, a moldboard plow attached to a stub beam, a pair of vertically spaced solid lInks pivotally connected at their forward ends to said supporting frame and at their rear ends to said stub beam, biasing means connected between one of said links and said frame for biasing said stub beam into plowing position, in all positions of said plow said pivotal connection of the lower of said links and said frame being positioned forwardly of the pivotal connection of the upper of said links with said frame and said pivotal connection of said lower link and said stub beam being positioned rearwardly of the pivotal connection of said upper link with said stub beam whereby when said plow strikes an object said plow will move rearwardly and upwardly without the point of said plow striking the bottom of the plow furrow, said upper link is approximately one-half the length of said lower link and is vertically spaced therefrom to provide said plow with a twofold tripping action when an object is struck, a first action of moving backwards principally while maintaining a plowing aspect of the plow, a second action of pivoting the plow as it is moved rearwardly, and said biasing means comprises a hydraulic cylinder pivotally connected at one end to said frame and pivotally connected at the other end thereof to a crank arm of one of said links, said hydraulic cylinder being hydraulically connected to an accumulator carried by said frame for providing a hydraulic force resisting upward movement of said plow and for storing energy provided by the upward movement of said plow.

Claim 5

A self-restoring plow trip comprising a supporting frame, a moldboard plow attached to a stub beam, a pair of vertically spaced solid lInks pivotally connected at their forward ends to said supporting frame and at their rear ends to said stub beam, biasing means connected between one of said links and said frame for biasing said stub beam into plowing position, in all positions of said plow said pivotal connection of the lower of said links and said frame being positioned forwardly of the pivotal connection of the upper of said links with said frame and said pivotal connection of said lower link and said stub beam being positioned rearwardly of the pivotal connection of said upper link with said stub beam whereby when said plow strikes an object said plow will move rearwardly and upwardly without the point of said plow striking the bottom of the plow furrow, said upper link is approximately one-half the length of said lower link and is vertically spaced therefrom to provide said plow with a twofold tripping action when an object is struck, a first action of moving backwards principally while maintaining a plowing aspect of the plow, a second action of pivoting the plow as it is moved rearwardly, and said biasing means comprises a hydraulic cylinder pivotally connected at one end to said frame and pivotally connected at the other end thereof to a crank arm of one of said links, said hydraulic cylinder being hydraulically connected to an accumulator carried by said frame for providing a hydraulic force resisting upward movement of said plow and for storing energy provided by the upward movement of said plow.

Claim 6

A self-restoring plow trip comprising a supporting frame, a moldboard plow attached to a stub beam, a pair of vertically spaced solid links connected at their forward ends to said supporting frame rearwardly of the forward point of said plow when in plowing position and said links being connected at their rear ends to said stub beam, biasing means connected between one of said links and said frame for biasing said stub beam into plowing position and permitting relief upon striking an object, in all positions of said plow said pivotal connection of the lower of said links and said frame being positioned forwardly of the pivotal connection of the upper of said links with said frame and said pivotal connection of said lower link and said stub beam being positioned rearwardly of the pivotal connection of said upper link with said stub beam whereby when said plow strikes an object said plow will move rearwardly and upwardly without the point of said plow striking the bottom of the plow furrow, and the pivotal connections of said lower link lie in a line generally parallel to a line connecting the pivotal connections of said upper link while plowing with said upper link being approximately one-half the length of said lower link so that the initial movement of the plow upon striking an object will be upward and rearward followed by a final pivotal movement of said plow presenting the point of the plow downwardly to aid the plow in clearing itself of the object struck.

Claim 7

A self-restoring plow trip comprising a supporting frame, a moldboard plow attached to a stub beam, a pair of vertically spaced solid links connected at their forward ends to said supporting frame rearwardly of the forward point of said plow when in plowing position and said links being connected at their rear ends to said stub beam, biasing means connected between one of said links and said frame for biasing said stub beam into plowing position and permitting relief upon striking an object, in all positions of said plow said pivotal connection of the lower of said links and said frame being positioned forwardly of the pivotal connection of the upper of said links with said frame and said pivotal connection of said lower link and said stub beam being positioned rearwardly of the pivotal connection of said upper link with said stub beam whereby when said plow strikes an object said plow will move rearwardly and upwardly without the point of said plow striking the bottom of the plow furrow, and the pivotal connections of said lower link lie in a line generally parallel to a line connecting the pivotal connections of said upper link while plowing with said upper link being approximately one-half the length of said lower link so that the initial movement of the plow upon striking an object will be upward and rearward followed by a final pivotal movement of said plow presenting the point of the plow downwardly to aid the plow in clearing itself of the object struck.