Geometrical instruments – Area integrators – Electrical
Patent
1976-05-07
1977-12-06
Aegerter, Richard E.
Geometrical instruments
Area integrators
Electrical
33112, B43L 700
Patent
active
040609022
ABSTRACT:
A combination straight edge, T-square, level, ruler and guide is provided for use by craftsman such as paperhangers, carpenters, and the like. The tool includes a relatively wide elongated body formed with parallel straight edges along both long edges, a handle and a plurality of replaceable bubble vials for establishing vertical and horizontal lines. A detachable and adjustable T-bar is provided and is formed with a lip along one edge whereby the T-bar in one position is flush with the bottom edge of the body, and in another position the lip extends downwardly to engage an edge of the work, for example. The T-bar is also provided with replaceable vials as well as a handle so that it may be used independent of the main body of the tool.
REFERENCES:
patent: 494322 (1893-03-01), Callahan
patent: 905054 (1908-11-01), Chynoweth
patent: 1053083 (1913-02-01), Blizard
patent: 1298010 (1919-03-01), Coleman
patent: 2307892 (1943-01-01), Lowther
patent: 2998655 (1961-09-01), White
patent: 3925899 (1975-12-01), Hesse et al.
Aegerter Richard E.
Shepperd John W.
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