Patent Application
20080098607
Not applicable
Not applicable
The present invention generally relates to rulers and compasses.
In one embodiment is disclosed a ruler for drawing or measurement of circles, straight lines, and angles. The ruler body has a longitudinal slot in the middle and parallel with the length of the ruler. A sliding pen or pencil holder is placed within the slot for drawing or measuring. A compass is included in the combinations.
In one embodiment is disclosed a compass ruler wherein it is easy to compare SAE or English units with Metric units for measuring, sketching, or using the ruler as a compass for drawing a circle.
In one embodiment all lines to be sketched, radii of circles, or other objects may be measured in both SAE and Metric units at the middle of the ruler.
In embodiment is compared the different units of SAE and Metric before drawing.
In one embodiment is disclosed the combination of a straight ruler, protractor, and compass, which can be used as a simple ruler for sketching or drawing a line using a track in the middle of the ruler and parallel to the ruler's length.
For a further understanding of the nature, objects, and advantages of the present invention, reference should be had to the following detailed description, read in conjunction with the following drawings, wherein like reference numerals denote like elements and wherein:
The professional compass-ruler 10 combines the advantages of a compass, protractor, and ruler. It can be used for finding, drawing, or measuring an angle, circle, or straight line at the center of the ruler's length.
In one embodiment compass-ruler 10 comprises body 20 with upper 30 and lower 40 sections, track or slot 50, and pen or pencil holder 100 slidably connected to track or slot 50. Track or slot 50 can have centerline 56, along with first 200 and second 300 liner measuring scales. First measuring scale 200 can have inner 210 and outer 220 indicia. Second measuring scale 300 can have inner 310 and outer 320 indicia. Upper section 30 can be fixed to lower section 40. Upper section 300 can include angular measuring scale 400 and larger angular measuring scale 410.
When drawing lines a pen 5 (not shown) travels along and through the ruler's 10 track 50 to leave a mark (e.g., on drawing paper). The ruler's 10 track 50 is straight from O dimension 60 to the end 70 of the ruler's 10 length.
For finding or drawing an angle—start from the central line 56 of the ruler's 10 track 50 at 180 or O (at upper opening 60) and then read the number of an angle on scale 400. If the angle is larger than 180 on the left of a central line, the degree appears on the retractor scale 410, and is the same of the degree at the opposite straight to another side below of an axis; add these numbers for the degree of an angle.
The professional compass-ruler 10 may also be used as a compass for drawing circles which have a radius within the length the ruler's 10 track 50 (between 1/16th of an inch to 12 inches as shown in
The material for reproduction of the professional compass-ruler can include cleared mica, thin wood or stainless steel; and the ruler's 10 track 50 can be magnetic to easily slide or clutch holder 100 on tight when drawing.
The following is a list of reference numerals.
All measurements disclosed herein are at standard temperature and pressure, at sea level on Earth, unless indicated otherwise. All materials used or intended to be used in a human being are biocompatible, unless indicated otherwise.
The foregoing embodiments are presented byway of example only; the scope of the present invention is to be limited only by the following claims.
This is a continuation of co-pending U.S. patent application Ser. No. 11/332,598, filed Jan. 9, 2006, priority of which is claimed and which is incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11332598 | Jan 2006 | US |
| Child | 11970383 | Jan 2008 | US |
