Irregular surface ellipsograph
OwnerCharles F. Langstoninventor
Life of this patent
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Abstract
An apparatus, of a compact pocket-sized design, for the description of accurate ellipses of an infinite number of conjugate and transverse diameters on flat and/or irregular surfaces, such as spherical or horizontal and vertical cylindrical tanks, having two identical, independent focal-point holders, a non-elastic inter-connecting cord and a variety of inter-changeable mounting bases to allow the mounting of the focal-point holders on soft, porous, non-porous, textured and metallic surfaces.
Claims13
Apparatus for the accurate description of ellipses of various conjugate and transverse diameters on planar and irregular surfaces of various compositions, textures and porosities comprising in combination:
- a) a plurality of pairs of interchangeable focal-point base members, each pair having different securing means located at a lower end of each base member for attachment to said surfaces;
- b) indexing means located on each base member, whereby said focal-point base members can be accurately aligned with plotted dimensional lines;
- c) cord length maintaining means engaging an upper end of each base member, whereby an interconnecting cord can be adjusted to a desired length, said cord length maintaining means including crimping means, whereby an inter-connecting cord can be retained in the adjusted position resisting movement in any direction;
- d) threadably transferrable means associated with each base member and cord length maintaining means, whereby said cord length maintaining means can be changed form one of said pairs of focal-point base members to another;
- and
- e) an inter-connecting, non-elastic cord adapted to connect one of said pairs of focal point base members through said cord length maintaining means.
Dependencies are inferred from the claim text.