Ruler with safety shield
AssigneeSquare 1 Product Development, Inc.
InventorsMikael Bäckström, Keith D. Alsberg
Life of this patent
Estimating the term…
Abstract
A tool for aiding marking or cutting is described. A V-shaped member having an edge formed at an exterior apex of the V for guiding a marker or cutting tool. The exterior surfaces of the V-shaped member may have a material applied having a higher coefficient of friction than that of the V-shaped member. The edge at the apex of the V may have two substantially planar surfaces, each of which forms a complimentary angle with the interior apex angle of the V, or a thin metal portion formed in the exterior apex of the V so that an edge thereof protrudes sloping towards a surface on which the tool is laid. A graduated scale may be applied to an exterior surface of the tool at a location near the apex.
Claims20
A apparatus for aiding marking or cutting a flat object, comprising:
- a length of a first material having a V-shaped cross section with an apex formed by an intersection of planes coincident with a first exterior surface and a second exterior surface of the V-shaped cross section;
- and,
- a third and a fourth exterior surface of an apex of the V-shaped cross section are substantially flat surfaces extending along a length of the apparatus,
- wherein a flat portion of each of the first exterior surface or the second exterior surface is separately positionable in contact with a surface of the flat object, while the other of the first exterior surface or the second exterior surface is not in contact with the surface of the flat object, and an interior angle between the first exterior surface and the second exterior surface is an acute angle;
- the third and fourth the flat surfaces are symmetrically disposed with respect to an axis of symmetry of the V-shaped cross section, and an angle formed between a plane passing through a flat surface of the flat surfaces and a plane passing through an adjoining one of the first or the second surfaces is approximately the compliment of an internal apex angle of the V-shaped cross section.
An apparatus for aiding marking or cutting, comprising:
- a length of a first material having a V-shaped cross section with a first exterior surface and a second exterior surface, arranged such that a plane coinciding with the first exterior surface and a plane coinciding with the second exterior surface have an intersection such that an acute interior angle is formed therebetween;
- and
- a layer of a second material formed on, or applied to, at least one of the first or the second exterior surfaces, or an edge of the V-shaped cross section, at a location distal from the intersection of the planes,
- wherein each one of the first exterior surface or the second exterior surface is separately positionable in close proximity to a surface of a flat object;
- and, a coefficient of friction of the second material is greater than a coefficient of friction of the first material;
- and, a web having a V-shape is disposed orthogonal to the length and to an interior surface of the V-shaped cross section.
Dependencies are inferred from the claim text.