Geometrical instruments – Area integrators – Electrical
Patent
1981-09-14
1983-01-11
Haroian, Harry N.
Geometrical instruments
Area integrators
Electrical
G01B 314
Patent
active
043675930
ABSTRACT:
The drafting tool provides true length measurements for laying out and forming a pattern of a transition between two conduits. A post, pivotally positionable upon a base, is angularly oriented commensurate with the longitudinal axis of the transition if the ends are non parallel, otherwise it is vertical and the post includes indicia representative of the mean height of the transition. A first bar positionable in each of a plurality of fixed radial positions about the post has indicia representative of the radius of the conduit from which the transition is to extend. An indicator is slidably positionable along the bar and supports a measuring device for measuring the true length from predetermined radials to predetermined points upon the bottom of the transition. A second bar extending radially from the post also has indicia representative of the radius of the conduit and which indicia cooperates with a scaled arm pivotally attached to the indicator to provide a measurement of the chord length intermediate two radials intersecting the circumference of the to be defined upper end of the transition. A cammed pivoting mechanism supports the post to maintain true height readings upon its indicia. The base is retainingly positionable upon a plate or a pipe to develop a pipe layout for a pipe miter. A fixed length rod extending from the indicator of the first bar is employed to determine the layout pattern.
REFERENCES:
patent: 2095059 (1937-10-01), Donnelly
patent: 3082537 (1963-03-01), Solomon
patent: 3129512 (1964-04-01), Schiler
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