Geometrical instruments – Straightedge type
Patent
1982-05-26
1984-04-24
Martin, Jr., William D.
Geometrical instruments
Straightedge type
33474, 33484, 2121, G01B 300
Patent
active
044439539
ABSTRACT:
A handle for a drafting instrument and the like comprising a ring body structure having a traverse slot therethrough for permitting the ring to be compressed, and further provided with a groove or ridge structure for complementary engagement with the perimeter of a hole and double aperture of a drafting instrument with which the handle is used. The preferred embodiment has one ridge which is closest to the gripping surface of a handle of larger diameter than a contact ridge furthermost from the gripping surface for permitting easy indexing of the handle during installation with the drafting instrument. Another embodiment reverses the respective diameters of the two ridges, while a further embodiment employs an internal spring for increasing the outward tension of the ring when released, and a further embodiment wherein tongue and groove structure is complementarily provided between the drafting instrument and the engaging portion of the handle ring.
REFERENCES:
patent: 699738 (1902-05-01), Zange
patent: 1383759 (1921-07-01), Romie
patent: 2080620 (1937-05-01), Martin
patent: 2364529 (1944-12-01), Hill
patent: 2518851 (1950-08-01), Anderson
patent: 2593914 (1952-04-01), Palitto
patent: 2602228 (1952-07-01), Webber
patent: 3016562 (1962-01-01), Reid
patent: 3380208 (1968-04-01), Cook
Huckert John W.
Martin, Jr. William D.
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