Before we understand dimensioning in patent drawings, let’s first understand what a patent drawing is. Speaking broadly, patent drawing is a kind of technical drawing used to communicate visually how something functions or is to be constructed. Patent drawings are used by individual inventors, companies, and industry experts to support their invention while filing a patent application.
Draftsmen or draftsperson who create these patent-related drawings use some familiar symbols, perspectives, units of measurement, notation systems, visual styles, dimensioning and page layout that are accepted universally. Together, such conventions constitute a visual language and help to ensure that the drawing is unambiguous and relatively easy to understand.
As we mentioned in the previous part of this article that a drafting technician uses various standards and dimensioning is one of those standards that should be followed while creating drawings for scientific works. This article underlines some important facts about dimensioning in patent drawings.
What is dimensioning?
Dimensioning is an art of providing a clear and complete description of an object in patent drawings and/or technical drawings. Unlike visual arts wherein the artist has the liberty to let it get interpreted in many ways, here we don’t have that liberty. A patent drawing should be drafted in such a way that it lets viewers interpret it in a single way only and not otherwise. A complete set of dimensions will permit only one interpretation needed to construct the part.
Properties of dimensions:
There are mainly four properties those define whether a mentioned dimension is accurate or not, below are the properties:
Accuracy: correct values should be provided
Completeness: nothing must be left out, and nothing duplicated
Clearness: dimensions must be placed in appropriate positions
Readability: the appropriate line quality must be used for legibility
What is a dimension line?
It is a thin line, broken in the middle to allow the placement of the dimension value, with arrowheads at each end. Generally, an arrowhead is 3 mm long and 1 mm wide, or in other words, we can say is that the length is roughly three times the width.
What is an extension Line?
An extension line extends a line on the object to the dimension line.
What is a leader line?
A leader line is used to give a comment about a specific area of a patent drawing.
What is datum line?
A ‘datum line’ also called “reference line” or “common line” is used while dimensioning a block with a notch or cut. This eliminates the addition of measurement or machining inaccuracies that would come from “chain” or “series” dimensioning.
Where should a draftsperson put dimensions?
The best place to put a dimension is the face that describes the feature most clearly. Putting dimensions in the left, right, up and down could put your objective in jeopardy.
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