Geometrical instruments – Scriber – Curved line
Patent
1991-04-08
1991-10-22
Haroian, Harry N.
Geometrical instruments
Scriber
Curved line
B43L 1104
Patent
active
050582828
ABSTRACT:
A trammel-beam ellipsograph is disclosed wherein the beam is made of two sliding elements in parallel relationship with a scribe-bearing cursor riding upon them. Each beam element is pivotably attached at one end to a slide restrained within one of two perpendicular tracks. A scale on each beam element indicates the distance from the pivot relating to each respective slide to the scribe on the cursor, thereby indicating a measure of the major and minor axes of the ellipse to be scribed. Concentric ellipses having a uniform elliptical annulus therebetween may be drawn by holding the beam elements against sliding while moving the cursor a distance equal to the width of the annulus. The invention further features modular track sections to facilitate drawing ellipses of aspect ratios greater than 2:1. A trammel-beam ellipsograph is disclosed wherein the beam is made of two sliding elements in parallel relationship with a scribe-bearing cursor riding upon them. Each beam element is pivotably attached at one end to a slide restrained within one of two perpendicular tracks. A scale on each beam element indicates the distance from the pivot relating to each respective slide to the scribe on the cursor, thereby indicating a measure of the major and minor axes of the ellipse to be scribed. Concentric ellipses having a uniform elliptical annulus therebetween may be drawn by holding the beam elements against sliding while moving the cursor a distance equal to the width of the annulus. The invention further features modular track sections to facilitate drawing ellipses of aspect ratios greater than 2:1.
REFERENCES:
patent: 932768 (1909-08-01), Dexter
patent: 1031780 (1912-07-01), Fine
patent: 2326412 (1943-08-01), Taylor
Bergquist Donald A.
Haroian Harry N.
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