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US 5,142,789 AGranted
Head of universal parallel ruler
AssigneeMutoh Industries Ltd.
InventorKazutoshi Shimizu
Life of this patent
Estimating the term…
Abstract
A head of a universal parallel ruler having a base 2 supported so as to be movable in parallel on a drafting board comprises a scale mounting plate 16 having an upper portion supported so as to be rotatable on the upper face side of the base 2 and a handle member 34 provided above the scale mounting plate 16, so that an operator can hold the handle member 34 by hand to directly rotate the scale mounting plate 16 for carrying out a plotting operation.
Claims6
A head of a universal parallel ruler for use on a drafting board, comprising:
- a base adapted to be supported on and moved in parallel along the drafting board;
- a scale mounting plate having an upper horizontal portion rotatably mounted on an upper portion of said base, and a lower horizontal portion disposed downwardly of said upper horizontal portion, said upper horizontal portion and said lower horizontal portion being disposed at opposing ends of said scale mounting plate;
- a pair of straightedge members secured to said lower horizontal portion of said scale mounting plate and being adapted for movement along and in parallel with the drafting board;
- and
- a handle member mounted to said upper horizontal portion of said scale mounting plate and being adapted to be gripped by an operator and manipulated in order to rotate said scale mounting plate relative to said base.
2 more elements
Dependencies are inferred from the claim text.