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US 4,662,076 AGranted
Compass
OwnerMohammad M. Saadatinventor
Life of this patent
Estimating the term…
Abstract
A compass, comprising a sliding rod with a handle at an upper end, and a drawing portion. A slider is slidably mounted on the sliding rod. Two links are pivotally connected to the slider and to the drawing portion at respective first pivot points forming at least approximately a parallelogram. A crank is operatively pivotally connected to the sliding rod and to a center of one of the links at respective pivot points, the crank having a length between its pivot points equal to half the length of the link to which the crank is connected between the first pivot points of the one link.
Claims16
A compass, comprising
- a sliding rod with a handle at an upper end,
- a drawing portion adapted to be connected with a marking means for drawing,
- a slider axially movably mounted on said sliding rod,
- two links pivotally connected adjacent respective ends thereof to said slider and to said drawing portion at respective first pivot points forming at least approximately a parallelogram, and
- a crank operatively pivotally connected adjacent respective ends thereof to said sliding rod and to a center of one of said links at respective second pivot points, the crank having a length between said second pivot points equal to half the length of said one link between said first pivot points of said one link.
2 more elements
Dependencies are inferred from the claim text.