Patent ID: 11903347
Assignee: NATIONAL ATTACHMENTS INCORPORATED
Field: Machine tools (Mechanical engineering)
Classification: CPC A  B  E | IPC A  B  E

Claim 0:
1. A multi-purpose tool for attachment to an excavator arm, the tool comprising a front jaw assembly pivotally coupled with a back jaw assembly, wherein:
the front jaw assembly comprises:
a grubbing arm having a front plate that connects left and right side plates, wherein the front, the left, and the right side plates each have a solid geometry; and

the back jaw assembly comprises:
a knife arm having a back side facing opposite the front jaw assembly and a front side facing the front jaw assembly, the knife arm extending from a proximal end adjacent to the excavator arm to a distal end offset from the excavator arm; and
a jointed cutting blade extending outward from the front side of the knife arm to a sharpened cutting edge having a dual-bevel cross-sectional geometry, wherein:
the jointed cutting blade comprises a proximal section abutting a distal section, the proximal section disposed at the proximal end of the knife arm and the distal section disposed at the distal end of the knife arm; and
the jointed cutting blade is disposed upon at least 70-90 percent of the front side of the knife arm between the proximal and the distal ends of the knife arm:

further comprising:
a front positive stop disposed upon the grubbing arm;
a back positive stop disposed upon the knife arm; and
a dual anvil extending from the grubbing arm toward the knife arm, the dual anvil comprising opposing anvil walls separated by an anvil channel, the dual anvil having a planar face and a base portion in opposition to one another, the planar face of the dual anvil containing the anvil channel, and the base portion of the dual anvil supported along the grubbing arm over a length corresponding to the anvil channel, wherein:
the cutting edge of the jointed cutting blade defines a centerline plane; and
the centerline plane bisects the anvil channel, such that when the front and the back jaw assemblies are pivoted into a closed position in which the front and the back positive stops meet, the cutting edge is sheathed within the anvil channel.