Geometrical instruments – Straightedge type – Base attached
Patent
1978-06-05
1979-07-31
Haroian, Harry N.
Geometrical instruments
Straightedge type
Base attached
B43L 1302
Patent
active
041625781
ABSTRACT:
An improved T-square which is self-supporting consists of a main body and a carriage. The main body consists of an elongated straight edge member having a head at one end thereof formed with a mounting channel for receiving a marginal edge portion of a drawing board for movement therealong. The carriage has a second mounting channel formed therein for engaging a support rail which is spaced from the first edge of the drawing board. The carriage is movable along the support rail. A resilient tensioning device is provided which connects the carriage to the main body. A luminaire chamber is formed in the main body in close proximity to the straight edge and a luminaire is operatively mounted in the luminaire chamber to illuminate the straight edge of the body. In addition, a sensor is provided for detecting improper alignment of the T-square with respect to the board on which it is mounted.
REFERENCES:
patent: 353477 (1886-11-01), Bloemker
patent: 1404000 (1922-01-01), Barber
patent: 2511654 (1950-06-01), Spoor
patent: 2574463 (1951-11-01), Chapin
patent: 2854751 (1958-10-01), Casey
patent: 2908081 (1959-10-01), Burke
patent: 2954609 (1960-10-01), Goertz
patent: 4075467 (1978-02-01), Peterson
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