Importance

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Abstract

A trip shank mechanism including a tool bar, an upper support member fixedly attached to the upper side of the tool bar, a lower support member fixedly attached to the lower side of the tool bar and a bracket pivotally connected to the lower support member. A toggle link mechanism is supported between the upper support member and the bracket member and includes an upper and a lower link member pivotally connected at respective first portions thereof by a first pivotal connection. A second pivotal connection pivotally mounts a second portion of the upper link member to the upper support member and a third pivotal connection pivotally mounts a second portion of the lower link member to the bracket member. The first pivot connection is located at an intermediate position between the second and third pivot connections. A biasing mechanism mounted on the upper support member with one end thereof pivotally attached to an intermediate portion of the upper link member. The biasing mechanism normally retains the upper and lower link members in substantially linear alignment with each other. An earthworking tool is fixedly attached to the pivotal bracket member and is movable between a working position wherein the upper and lower link members are in substantially linear alignment with each other and the first pivot connection is in a first position spaced from an imaginary plane passing through the axes of the second and third pivot connections and a non-working position wherein the upper and lower link members are angularly related to each other and the first pivot connection is in a second position spaced from the first position.

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First Claim