Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Patent
1998-04-03
1999-11-02
Fulton, Christopher W.
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
33460, 33464, B43L 710
Patent
active
059746777
ABSTRACT:
The layout instrument or tool of this invention includes a pair of members arranged together to form an "L" at a right angle. The unique feature of this arrangement is that the two opposing ends of the "L" are also affixed to another member changing the shape from an "L" to the shape of a 3-4-5 triangle. All members of the instrument are permanently attached, therefore, misalignment is avoided and accuracy is assured and maintained. The two members are configured to slide with respect to one another at the pivot point of the "L" and simply pivot at their opposite ends about their pivot points connecting the third member and creating an enclosed triangle. A spring loaded rivet mounted in one of "L" members slides in a skewed slot in the adjacent member to open the triangle from a closed position where the three sides or members of the triangle are substantially parallel to one another. The rivet locks in a semi-circular aperture which maintains the tool in a proper locking position even if the rear portion of the semi-circle becomes distorted from the repeated use.
REFERENCES:
patent: 124222 (1872-03-01), Scott
patent: 1209855 (1916-12-01), Follette
patent: 2667697 (1954-02-01), McGrath
patent: 5414938 (1995-05-01), Meek
Fulton Christopher W.
Joel, Esq Richard A
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