Squareangle
AssigneeRichard M. McMahon
InventorL. Allan Cross
Life of this patent
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Abstract
This invention relates generally to mobile carpentry and drafting devices and, more particularly, to an integral combination type device which is capable of performing multiple geometry measuring functions within a single instrument. The invention relates specifically to a unique combination of independent carpentry functions into a single device to replace separate tools heretofore required to perform individual functions. The Squareangle may be used to check surfaces for plumb and levelness; check inside and outside squareness; find the center of a circle, square, or octagon; mark 45.degree. and right angles; scribe lines; measure distance; and perform other geometry and drafting functions without the aid of additional devices.
Claims13
An integral, mobile combination drafting and carpentry device comprising:
- a rigid square body bounded by four sides and having a front and back surface and having a square opening through said surfaces located precisely at the center of the said body;
- a rigid triangle having forty-five degree angles at its base with the length of the triangle base being the same as one side of said body and secured to the back surface of said body with the triangle base parallel to and coextensive with the edge of said one side of said body;
- a measuring scale on the front surface of said body and located near said one side and including a levelness reference mark located near another side which intersects said one side;
- a rigid movable blade having a pointed end and being rotatably attached to said body front surface at the junction of said other side with a side that is parallel to said one side and said pointed end cooperating with said reference point;
- a means of firmly holding said blade at any angle through its rotation.
In an integral, mobile combination carpentry device comprising:
- a rigid square body bounded by four sides and having a front and back surface and having a square opening through said surfaces located precisely at the center of the said body, and said body having a top slotted edge offset in a plane to the vertical plane of the said body and having a recessed grove removed at the bottom of the slotted edge;
- a rigid movable blade having a pointed end and being rotatably attached to said body front surface at the junction of said top slotted edge with a vertical edge of said body so that said rotatable blade may be retracted within the slot of said top edge and rotatatively positioned parallel to the top slotted edge and rotatively positioned parallel to the said vertical edge of the said body;
- a rigid triangle having two forty-five degree angles at its base with the length of the triangle base being equal to the outside length of said body and secured to the back surface of said body with the triangle base parallel to and coextensive with one side of said body;
- a measuring scale located on the front surface of said body near said one side and including a levelness reference mark located near another side which intersects with said one side, said blade cooperating with said reference mark;
- a means of firmly holding the said blade at any angle through its rotation.
An integral, mobile combination carpentry device comprising:
- a rigid square body bounded by four sides and having a front and back surface and having a slotted top edge offset to the vertical plane of the said body with a semi-circular grove removed at the bottom of the top slotted edge with the said body having a square opening through said surfaces located precisely at the center of the said body;
- a rigid forty-five degree triangle with a right angle at the top of said triangle and base length equal to the base of the said body and attached to the back surface of the said body with the triangle base parallel to and coextensive with the edge of the said body;
- a metal rotatably movable rectangular blade having a pointed end and a semi-circular shape at the opposite end, and said blade pivotedly joined to said body at the junction of one vertical edge of said body with the said slotted top edge and, said blade having a small hole in the center of the said blade near the point;
- a measuring scale attached to the front surface of of said body including a levelness reference mark located near said one side;
- a means of firmly holding the said blade at any angle through its rotation.
Dependencies are inferred from the claim text.