Drawing instrument

Details Drawing instrument Drawing instrument

1992-01-29

1992-12-22

Haroian, Harry N.

Geometrical instruments

Straightedge type

With means for moving straightedge over a surface

335611, B43L 704

Patent

active

051724820

ABSTRACT:
A non-marring drawing instrument includes a rolling member for supporting the body of the instrument on a drawing surface in spaced apart relation thereto. The rolling member is mounted on the body for movement between respective rolling and locked positions of the member projecting from the body. A resilient member constrains the rolling member in its rolling position, for rolling movement of the instrument on the drawing surface, and yields for movement of the rolling member into its locked position. Frictional braking structure, which may include the resilient member, engages the rolling member in its locked position, for immobilizing the instrument. Braking is accomplished by pressing the instrument body towards the drawing surface.

REFERENCES:
patent: 1584839 (1926-05-01), Cameron
patent: 2234467 (1941-03-01), De Lisle
patent: 2707301 (1955-05-01), Urso
patent: 2752685 (1956-07-01), Zauner
patent: 3096536 (1963-07-01), Rabelos
patent: 3225445 (1965-12-01), Duggan
patent: 3462846 (1969-08-01), Goerz
patent: 3747217 (1973-07-01), Middlebeek
patent: 4670991 (1987-06-01), McKay et al.
patent: 4821424 (1989-04-01), Loggins
patent: 4926564 (1990-05-01), Loggins
patent: 4999922 (1991-03-01), Loggins

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