Geometrical instruments – Straightedge type – Plural straightedges nonadjustably fixed at right angles
Patent
1997-05-28
1999-08-10
Fulton, Christopher W.
Geometrical instruments
Straightedge type
Plural straightedges nonadjustably fixed at right angles
33404, 33451, 33392, G01C 916, G01C 924
Patent
active
059339748
ABSTRACT:
A carpenter's square having a first and second leg at right angles to each other, and a third leg extending between the first and second legs. A magnetic strip on the first leg for attaching the tool to a metallic surface to be plumbed. A first notch in the third leg a first distance from the first leg and a second notch in the third leg a second distance from the first leg so that a plumb string can be threaded through the first and second notches and thereby held in place to support a plumb bob to allow a plumb reading to be taken without the need for manually supporting the plumb bob.
REFERENCES:
patent: 885076 (1908-04-01), Olson
patent: 2343688 (1944-03-01), Maxey
patent: 2627124 (1953-02-01), Rock
patent: 2794263 (1957-06-01), Cranmer
patent: 4404753 (1983-09-01), Klok
Balas Tim
Walters Larry R.
Fulton Christopher W.
Vincent Douglass F.
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