A soil penetrating tool assembly

A - Human Necessities – 01 – B

Patent

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Details

A01B 61/04 (2006.01) A01B 15/00 (2006.01) F15B 15/20 (2006.01)

Patent

CA 2224233

A soil penetrating tool assembly (10) having a tool shank (18) which is pivotally mounted so as to clear obstructions in the ground. Movement of the shank away from its normal attitude is opposed by a hydraulic ram (22). The force required to be exerted by the shank (18) against the opposing force of the ram (22) is initially high but is reduced upon a predetermined movement of the tool (18) and thus a predetermined retraction of the ram (22). This allows the tool (18) to more easily clear large obstructions without causing damage to the tool (18). Two alternative valving arrangements are disclosed; one internal of the ram (figures 4, 10), where a plug extending in the ram cylinder coacts with a sleeve in the ram plunger, and one external (figure II) comprising a cam acting on a valve member in a fluid supply line. Hydraulic circuit with pressure amplifier and ram recharge bleed check valve is also disclosed (figures 5-9).

L'invention concerne un assemblage (10) constituant un outil pour labourer la terre, muni d'une dent (18) qui est montée de manière pivotante pour éliminer les obstructions dans le sol. Le mouvement qui déplace la dent de sa position normale est opposé par la force d'un vérin (22) hydraulique. La force que doit nécessairement exercer la dent sur les forces opposantes du vérin (22) est initialement élevée mais elle est réduite face à un mouvement prédéterminé de la dent (18) et face à une rétraction prédéterminée du vérin (22). Cela permet à la dent (18) d'éliminer les grosses obstructions sans endommager ladite dent (18). L'invention présente deux positions alternatives de soupapes; une à l'intérieur du vérin (22), où l'embout s'étendant dans le cylindre du vérin agit avec un manchon dans le piston du vérin, et une à l'extérieur comprenant une came agissant sur une soupape dans un canal d'alimentation de fluide. L'invention présente également un circuit hydraulique muni d'un amplificateur de pression.

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