Geometrical instruments – Straightedge type – Rules
Patent
1982-11-05
1985-01-29
Stearns, Richard R.
Geometrical instruments
Straightedge type
Rules
33485, G01B 304, B43L 700
Patent
active
044957092
ABSTRACT:
An easily attachable or removable snap-on adapter to triangular scales provides supplemental length-measuring scales, besides serving as a guard against accidental use of an inappropriate scale. It also acts as an aid for correctly orienting and accurately and firmly positioning the ruler for measurement or drafting purposes. It is made preferably of a molded plastic piece, whose inner contour comprises two elongated beads fitting snugly into each of two grooves along two sides of a standard triangular scale, and whose contour comprises a flap beneath each of these beads and a substantially flat, but flexible portion above the beads. When in use, the part of the inner contour which is directly opposite this flat portion is designed to rest on the upper edge of the scale. The adapter may have imprinted one or two scales, preferably color-coded, near one or both of the outside edges of one or both of the flaps, in which case it serves as a supplementary snap-on scale covering up and replacing the scales of the ruler. Alternatively, one of the flaps may be narrower than the corresponding side of the ruler, so that a selected scale of the ruler can remain exposed while the other scales remain covered up, in which case the adapter serves as a guard preventing accidental use of the covered scales.
REFERENCES:
patent: 146673 (1874-01-01), Haslett
patent: 1773899 (1930-08-01), Kaler
patent: 2365735 (1944-12-01), Ware
patent: 2382758 (1945-08-01), Weeks et al.
patent: 2423779 (1947-07-01), Kahn
patent: 2504251 (1950-04-01), Coffey
patent: 3087250 (1963-04-01), Blue
patent: 3310878 (1967-03-01), Giba
Silber Siegmar
Stearns Richard R.
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