Cast articulated tool
AssigneeCoats & Clark, Inc.
InventorsKarl Hannes, Paul C. Rossi
Life of this patent
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Abstract
An articulated cutting tool, such as scissors, is formed by casting a first element with a pivot region, and casting a second element using the pivot region of the first element as the mold for the pivot region of the second element. The pivot regions of the elements are tapered, and in order to free the pivot joint, the pin is upset, for example by punching in the axial direction of the pin. The articulated element thus formed is coated with a hard coating material, and the cutting edges of the tool are ground to provide a sharp cutting edge for shearing action to which the layer of hard coating material extends. The invention is also adaptable to articulated tools, such as pliers, which do not have cutting edges, in which case the plating and grinding of the tool may be omitted.
Claims9
A cast articulated tool comprising first and second cast members, said first member having a continuously linearly tapered aperture extending therethrough, said second member having a pin with an enlarged head extending from one side thereof formed integrally with said second member, said pin being tapered with the larger diameter end thereof toward said second member, the tapered portion of said pin having a form corresponding to the form of said aperture and being fitted within said aperture to form an articulated joint between said members, said tapered portion of said pin being continuously tapered in the same direction in the portion thereof fitted in said aperture, whereby said enlarged head inhibits separation of said members.
In an articulated tool having first and second members of a die casting metal joined at a pivot axis by a pin cast integrally with the second member and fitted into an aperture in said first member, the pin having an enlarged head to hold said members together, the improvement wherein said pin and aperture have matching tapered portions, with the larger diameter end of the tapered portion of said pin being toward said second member, the tapered portions of said pin and aperture extending continuously in the same direction throughout the length of said aperture.
In an articulated tool having first and second members joined at a pivot axis by a pin having a round cross section and rigidly extending from the second member, the pin being fitted into and extending through an aperture in said first member, the pin having an enlarged head on the end thereof away from said second member for holding said members together;
- the improvement wherein said pin has a diameter between said second member and said enlarged head that continuously decreases as the distance from said second member increases, and said aperture has a shape matching the shape of said pin, with the diameter continually decreasing as the distance from second member increases, throughout the length of said aperture.
Dependencies are inferred from the claim text.