Earthworking tool and method for protecting from abnormally...

Details Earthworking tool and method for protecting from abnormally... Earthworking tool and method for protecting from abnormally...

E - Fixed Constructions

21

C

262/83

E21C 35/18 (2006.01) E02F 9/28 (2006.01) E21B 10/62 (2006.01) E21C 35/193 (2006.01) E21C 35/19 (2006.01)

Patent

CA 1197866

TITLE OF THE INVENTION EARTHWORKING TOOL AND METHOD FOR PROTECTING FROM ABNORMALLY HIGH CUTTING LOADS ABSTRACT OF THE DISCLOSURE There is disclosed a base and block assembly for use with an earthworking bit. The assembly comprises a base and a block engaged in the base. The block has a shank portion and a toolholder portion extending from a first end of the shank and adapted for receiving the earthworking bit. The assembly also comprises means for causing the block to preferentially fail when exposed to abnormally high cutting loads. Also disclosed is a method for protecting the base of a base and block assembly when in use with an earthworking bit. The method comprises preferentially weakening the block so as to cause the block to fail when exposed to abnormally high cutting loads and engaging the block with the base.

425449

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